Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and |
| 4 | * Shaohua Li <shli@fb.com> |
| 5 | */ |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 6 | #include <linux/module.h> |
Matias Bjørling | fc1bc35 | 2013-12-21 00:11:01 +0100 | [diff] [blame] | 7 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 8 | #include <linux/moduleparam.h> |
| 9 | #include <linux/sched.h> |
| 10 | #include <linux/fs.h> |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 11 | #include <linux/init.h> |
Matias Bjørling | 6dad38d | 2018-07-06 19:38:38 +0200 | [diff] [blame] | 12 | #include "null_blk.h" |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 13 | |
Damien Le Moal | db060f5 | 2022-04-20 09:57:17 +0900 | [diff] [blame] | 14 | #undef pr_fmt |
| 15 | #define pr_fmt(fmt) "null_blk: " fmt |
| 16 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 17 | #define FREE_BATCH 16 |
| 18 | |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 19 | #define TICKS_PER_SEC 50ULL |
| 20 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) |
| 21 | |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 22 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 23 | static DECLARE_FAULT_ATTR(null_timeout_attr); |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 24 | static DECLARE_FAULT_ATTR(null_requeue_attr); |
Bart Van Assche | 596444e | 2020-03-09 21:26:23 -0700 | [diff] [blame] | 25 | static DECLARE_FAULT_ATTR(null_init_hctx_attr); |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 26 | #endif |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 27 | |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 28 | static inline u64 mb_per_tick(int mbps) |
| 29 | { |
| 30 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); |
| 31 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 32 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 33 | /* |
| 34 | * Status flags for nullb_device. |
| 35 | * |
| 36 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. |
| 37 | * UP: Device is currently on and visible in userspace. |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 38 | * THROTTLED: Device is being throttled. |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 39 | * CACHE: Device is using a write-back cache. |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 40 | */ |
| 41 | enum nullb_device_flags { |
| 42 | NULLB_DEV_FL_CONFIGURED = 0, |
| 43 | NULLB_DEV_FL_UP = 1, |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 44 | NULLB_DEV_FL_THROTTLED = 2, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 45 | NULLB_DEV_FL_CACHE = 3, |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 46 | }; |
| 47 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 48 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 49 | /* |
| 50 | * nullb_page is a page in memory for nullb devices. |
| 51 | * |
| 52 | * @page: The page holding the data. |
| 53 | * @bitmap: The bitmap represents which sector in the page has data. |
| 54 | * Each bit represents one block size. For example, sector 8 |
| 55 | * will use the 7th bit |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 56 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
| 57 | * page is being flushing to storage. FREE means the cache page is freed and |
| 58 | * should be skipped from flushing to storage. Please see |
| 59 | * null_make_cache_space |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 60 | */ |
| 61 | struct nullb_page { |
| 62 | struct page *page; |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 63 | DECLARE_BITMAP(bitmap, MAP_SZ); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 64 | }; |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 65 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
| 66 | #define NULLB_PAGE_FREE (MAP_SZ - 2) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 67 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 68 | static LIST_HEAD(nullb_list); |
| 69 | static struct mutex lock; |
| 70 | static int null_major; |
Shaohua Li | 94bc02e | 2017-08-14 15:04:55 -0700 | [diff] [blame] | 71 | static DEFINE_IDA(nullb_indexes); |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 72 | static struct blk_mq_tag_set tag_set; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 73 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 74 | enum { |
| 75 | NULL_IRQ_NONE = 0, |
| 76 | NULL_IRQ_SOFTIRQ = 1, |
| 77 | NULL_IRQ_TIMER = 2, |
Christoph Hellwig | ce2c350 | 2014-02-10 03:24:40 -0800 | [diff] [blame] | 78 | }; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 79 | |
Max Gurtovoy | cee1b21 | 2021-04-12 09:55:23 +0000 | [diff] [blame] | 80 | static bool g_virt_boundary = false; |
| 81 | module_param_named(virt_boundary, g_virt_boundary, bool, 0444); |
| 82 | MODULE_PARM_DESC(virt_boundary, "Require a virtual boundary for the device. Default: False"); |
| 83 | |
weiping zhang | b3cffc3 | 2017-09-30 09:49:21 +0800 | [diff] [blame] | 84 | static int g_no_sched; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 85 | module_param_named(no_sched, g_no_sched, int, 0444); |
weiping zhang | b3cffc3 | 2017-09-30 09:49:21 +0800 | [diff] [blame] | 86 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
| 87 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 88 | static int g_submit_queues = 1; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 89 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 90 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
| 91 | |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 92 | static int g_poll_queues = 1; |
| 93 | module_param_named(poll_queues, g_poll_queues, int, 0444); |
| 94 | MODULE_PARM_DESC(poll_queues, "Number of IOPOLL submission queues"); |
| 95 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 96 | static int g_home_node = NUMA_NO_NODE; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 97 | module_param_named(home_node, g_home_node, int, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 98 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
| 99 | |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 100 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
Dongli Zhang | 290df92 | 2020-03-12 15:01:40 -0700 | [diff] [blame] | 101 | /* |
| 102 | * For more details about fault injection, please refer to |
| 103 | * Documentation/fault-injection/fault-injection.rst. |
| 104 | */ |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 105 | static char g_timeout_str[80]; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 106 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
Dongli Zhang | 290df92 | 2020-03-12 15:01:40 -0700 | [diff] [blame] | 107 | MODULE_PARM_DESC(timeout, "Fault injection. timeout=<interval>,<probability>,<space>,<times>"); |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 108 | |
| 109 | static char g_requeue_str[80]; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 110 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
Dongli Zhang | 290df92 | 2020-03-12 15:01:40 -0700 | [diff] [blame] | 111 | MODULE_PARM_DESC(requeue, "Fault injection. requeue=<interval>,<probability>,<space>,<times>"); |
Bart Van Assche | 596444e | 2020-03-09 21:26:23 -0700 | [diff] [blame] | 112 | |
| 113 | static char g_init_hctx_str[80]; |
| 114 | module_param_string(init_hctx, g_init_hctx_str, sizeof(g_init_hctx_str), 0444); |
Dongli Zhang | 290df92 | 2020-03-12 15:01:40 -0700 | [diff] [blame] | 115 | MODULE_PARM_DESC(init_hctx, "Fault injection to fail hctx init. init_hctx=<interval>,<probability>,<space>,<times>"); |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 116 | #endif |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 117 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 118 | static int g_queue_mode = NULL_Q_MQ; |
Matias Bjorling | 709c866 | 2014-11-26 14:45:48 -0700 | [diff] [blame] | 119 | |
| 120 | static int null_param_store_val(const char *str, int *val, int min, int max) |
| 121 | { |
| 122 | int ret, new_val; |
| 123 | |
| 124 | ret = kstrtoint(str, 10, &new_val); |
| 125 | if (ret) |
| 126 | return -EINVAL; |
| 127 | |
| 128 | if (new_val < min || new_val > max) |
| 129 | return -EINVAL; |
| 130 | |
| 131 | *val = new_val; |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) |
| 136 | { |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 137 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
Matias Bjorling | 709c866 | 2014-11-26 14:45:48 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 140 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
Matias Bjorling | 709c866 | 2014-11-26 14:45:48 -0700 | [diff] [blame] | 141 | .set = null_set_queue_mode, |
| 142 | .get = param_get_int, |
| 143 | }; |
| 144 | |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 145 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
Mike Snitzer | 54ae81c | 2014-06-11 17:13:50 -0400 | [diff] [blame] | 146 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 147 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 148 | static int g_gb = 250; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 149 | module_param_named(gb, g_gb, int, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 150 | MODULE_PARM_DESC(gb, "Size in GB"); |
| 151 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 152 | static int g_bs = 512; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 153 | module_param_named(bs, g_bs, int, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 154 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
| 155 | |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 156 | static int g_max_sectors; |
| 157 | module_param_named(max_sectors, g_max_sectors, int, 0444); |
| 158 | MODULE_PARM_DESC(max_sectors, "Maximum size of a command (in 512B sectors)"); |
| 159 | |
André Almeida | f7c4ce89 | 2019-09-11 11:46:36 -0300 | [diff] [blame] | 160 | static unsigned int nr_devices = 1; |
André Almeida | 701dfc4 | 2019-09-16 11:07:58 -0300 | [diff] [blame] | 161 | module_param(nr_devices, uint, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 162 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
| 163 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 164 | static bool g_blocking; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 165 | module_param_named(blocking, g_blocking, bool, 0444); |
Jens Axboe | db5bcf8 | 2017-03-30 13:44:26 -0600 | [diff] [blame] | 166 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
| 167 | |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 168 | static bool shared_tags; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 169 | module_param(shared_tags, bool, 0444); |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 170 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
| 171 | |
John Garry | 0905053 | 2020-08-19 23:20:29 +0800 | [diff] [blame] | 172 | static bool g_shared_tag_bitmap; |
| 173 | module_param_named(shared_tag_bitmap, g_shared_tag_bitmap, bool, 0444); |
| 174 | MODULE_PARM_DESC(shared_tag_bitmap, "Use shared tag bitmap for all submission queues for blk-mq"); |
| 175 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 176 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
Matias Bjorling | 709c866 | 2014-11-26 14:45:48 -0700 | [diff] [blame] | 177 | |
| 178 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) |
| 179 | { |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 180 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
Matias Bjorling | 709c866 | 2014-11-26 14:45:48 -0700 | [diff] [blame] | 181 | NULL_IRQ_TIMER); |
| 182 | } |
| 183 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 184 | static const struct kernel_param_ops null_irqmode_param_ops = { |
Matias Bjorling | 709c866 | 2014-11-26 14:45:48 -0700 | [diff] [blame] | 185 | .set = null_set_irqmode, |
| 186 | .get = param_get_int, |
| 187 | }; |
| 188 | |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 189 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 190 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
| 191 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 192 | static unsigned long g_completion_nsec = 10000; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 193 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 194 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
| 195 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 196 | static int g_hw_queue_depth = 64; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 197 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 198 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
| 199 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 200 | static bool g_use_per_node_hctx; |
Joe Perches | 5657a81 | 2018-05-24 13:38:59 -0600 | [diff] [blame] | 201 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
Matias Bjørling | 2000524 | 2013-12-21 00:11:00 +0100 | [diff] [blame] | 202 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 203 | |
Vincent Fu | 058efe0 | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 204 | static bool g_memory_backed; |
| 205 | module_param_named(memory_backed, g_memory_backed, bool, 0444); |
| 206 | MODULE_PARM_DESC(memory_backed, "Create a memory-backed block device. Default: false"); |
| 207 | |
| 208 | static bool g_discard; |
| 209 | module_param_named(discard, g_discard, bool, 0444); |
| 210 | MODULE_PARM_DESC(discard, "Support discard operations (requires memory-backed null_blk device). Default: false"); |
| 211 | |
| 212 | static unsigned long g_cache_size; |
| 213 | module_param_named(cache_size, g_cache_size, ulong, 0444); |
| 214 | MODULE_PARM_DESC(mbps, "Cache size in MiB for memory-backed device. Default: 0 (none)"); |
| 215 | |
| 216 | static unsigned int g_mbps; |
| 217 | module_param_named(mbps, g_mbps, uint, 0444); |
| 218 | MODULE_PARM_DESC(mbps, "Limit maximum bandwidth (in MiB/s). Default: 0 (no limit)"); |
| 219 | |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 220 | static bool g_zoned; |
| 221 | module_param_named(zoned, g_zoned, bool, S_IRUGO); |
| 222 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); |
| 223 | |
| 224 | static unsigned long g_zone_size = 256; |
| 225 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); |
| 226 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); |
| 227 | |
Aravind Ramesh | 089565f | 2020-06-29 12:06:38 -0700 | [diff] [blame] | 228 | static unsigned long g_zone_capacity; |
| 229 | module_param_named(zone_capacity, g_zone_capacity, ulong, 0444); |
| 230 | MODULE_PARM_DESC(zone_capacity, "Zone capacity in MB when block device is zoned. Can be less than or equal to zone size. Default: Zone size"); |
| 231 | |
Masato Suzuki | ea2c18e | 2018-10-30 16:14:05 +0900 | [diff] [blame] | 232 | static unsigned int g_zone_nr_conv; |
| 233 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); |
| 234 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); |
| 235 | |
Niklas Cassel | dc4d137e | 2020-08-28 12:54:00 +0200 | [diff] [blame] | 236 | static unsigned int g_zone_max_open; |
| 237 | module_param_named(zone_max_open, g_zone_max_open, uint, 0444); |
| 238 | MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones when block device is zoned. Default: 0 (no limit)"); |
| 239 | |
| 240 | static unsigned int g_zone_max_active; |
| 241 | module_param_named(zone_max_active, g_zone_max_active, uint, 0444); |
| 242 | MODULE_PARM_DESC(zone_max_active, "Maximum number of active zones when block device is zoned. Default: 0 (no limit)"); |
| 243 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 244 | static struct nullb_device *null_alloc_dev(void); |
| 245 | static void null_free_dev(struct nullb_device *dev); |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 246 | static void null_del_dev(struct nullb *nullb); |
| 247 | static int null_add_dev(struct nullb_device *dev); |
Damien Le Moal | 49c3b92 | 2022-04-20 09:57:18 +0900 | [diff] [blame] | 248 | static struct nullb *null_find_dev_by_name(const char *name); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 249 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 250 | |
| 251 | static inline struct nullb_device *to_nullb_device(struct config_item *item) |
| 252 | { |
| 253 | return item ? container_of(item, struct nullb_device, item) : NULL; |
| 254 | } |
| 255 | |
| 256 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) |
| 257 | { |
| 258 | return snprintf(page, PAGE_SIZE, "%u\n", val); |
| 259 | } |
| 260 | |
| 261 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, |
| 262 | char *page) |
| 263 | { |
| 264 | return snprintf(page, PAGE_SIZE, "%lu\n", val); |
| 265 | } |
| 266 | |
| 267 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) |
| 268 | { |
| 269 | return snprintf(page, PAGE_SIZE, "%u\n", val); |
| 270 | } |
| 271 | |
| 272 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, |
| 273 | const char *page, size_t count) |
| 274 | { |
| 275 | unsigned int tmp; |
| 276 | int result; |
| 277 | |
| 278 | result = kstrtouint(page, 0, &tmp); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 279 | if (result < 0) |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 280 | return result; |
| 281 | |
| 282 | *val = tmp; |
| 283 | return count; |
| 284 | } |
| 285 | |
| 286 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, |
| 287 | const char *page, size_t count) |
| 288 | { |
| 289 | int result; |
| 290 | unsigned long tmp; |
| 291 | |
| 292 | result = kstrtoul(page, 0, &tmp); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 293 | if (result < 0) |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 294 | return result; |
| 295 | |
| 296 | *val = tmp; |
| 297 | return count; |
| 298 | } |
| 299 | |
| 300 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, |
| 301 | size_t count) |
| 302 | { |
| 303 | bool tmp; |
| 304 | int result; |
| 305 | |
| 306 | result = kstrtobool(page, &tmp); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 307 | if (result < 0) |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 308 | return result; |
| 309 | |
| 310 | *val = tmp; |
| 311 | return count; |
| 312 | } |
| 313 | |
| 314 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ |
Andrew Morton | ca0a95a | 2020-02-03 17:34:49 -0800 | [diff] [blame] | 315 | #define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \ |
| 316 | static ssize_t \ |
| 317 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ |
| 318 | { \ |
| 319 | return nullb_device_##TYPE##_attr_show( \ |
| 320 | to_nullb_device(item)->NAME, page); \ |
| 321 | } \ |
| 322 | static ssize_t \ |
| 323 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ |
| 324 | size_t count) \ |
| 325 | { \ |
| 326 | int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ |
| 327 | struct nullb_device *dev = to_nullb_device(item); \ |
Bart Van Assche | b9853b4 | 2020-03-09 21:26:19 -0700 | [diff] [blame] | 328 | TYPE new_value = 0; \ |
Andrew Morton | ca0a95a | 2020-02-03 17:34:49 -0800 | [diff] [blame] | 329 | int ret; \ |
| 330 | \ |
| 331 | ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ |
| 332 | if (ret < 0) \ |
| 333 | return ret; \ |
| 334 | if (apply_fn) \ |
| 335 | ret = apply_fn(dev, new_value); \ |
| 336 | else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \ |
| 337 | ret = -EBUSY; \ |
| 338 | if (ret < 0) \ |
| 339 | return ret; \ |
| 340 | dev->NAME = new_value; \ |
| 341 | return count; \ |
| 342 | } \ |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 343 | CONFIGFS_ATTR(nullb_device_, NAME); |
| 344 | |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 345 | static int nullb_update_nr_hw_queues(struct nullb_device *dev, |
| 346 | unsigned int submit_queues, |
| 347 | unsigned int poll_queues) |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 348 | |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 349 | { |
| 350 | struct blk_mq_tag_set *set; |
| 351 | int ret, nr_hw_queues; |
| 352 | |
| 353 | if (!dev->nullb) |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 354 | return 0; |
| 355 | |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 356 | /* |
Ming Lei | 2bfdbe8 | 2021-12-03 10:39:35 +0800 | [diff] [blame] | 357 | * Make sure at least one submit queue exists. |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 358 | */ |
Ming Lei | 2bfdbe8 | 2021-12-03 10:39:35 +0800 | [diff] [blame] | 359 | if (!submit_queues) |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 360 | return -EINVAL; |
| 361 | |
| 362 | /* |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 363 | * Make sure that null_init_hctx() does not access nullb->queues[] past |
| 364 | * the end of that array. |
| 365 | */ |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 366 | if (submit_queues > nr_cpu_ids || poll_queues > g_poll_queues) |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 367 | return -EINVAL; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 368 | |
| 369 | /* |
| 370 | * Keep previous and new queue numbers in nullb_device for reference in |
| 371 | * the call back function null_map_queues(). |
| 372 | */ |
| 373 | dev->prev_submit_queues = dev->submit_queues; |
| 374 | dev->prev_poll_queues = dev->poll_queues; |
| 375 | dev->submit_queues = submit_queues; |
| 376 | dev->poll_queues = poll_queues; |
| 377 | |
| 378 | set = dev->nullb->tag_set; |
| 379 | nr_hw_queues = submit_queues + poll_queues; |
| 380 | blk_mq_update_nr_hw_queues(set, nr_hw_queues); |
| 381 | ret = set->nr_hw_queues == nr_hw_queues ? 0 : -ENOMEM; |
| 382 | |
| 383 | if (ret) { |
| 384 | /* on error, revert the queue numbers */ |
| 385 | dev->submit_queues = dev->prev_submit_queues; |
| 386 | dev->poll_queues = dev->prev_poll_queues; |
| 387 | } |
| 388 | |
| 389 | return ret; |
| 390 | } |
| 391 | |
| 392 | static int nullb_apply_submit_queues(struct nullb_device *dev, |
| 393 | unsigned int submit_queues) |
| 394 | { |
| 395 | return nullb_update_nr_hw_queues(dev, submit_queues, dev->poll_queues); |
| 396 | } |
| 397 | |
| 398 | static int nullb_apply_poll_queues(struct nullb_device *dev, |
| 399 | unsigned int poll_queues) |
| 400 | { |
| 401 | return nullb_update_nr_hw_queues(dev, dev->submit_queues, poll_queues); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | NULLB_DEVICE_ATTR(size, ulong, NULL); |
| 405 | NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL); |
| 406 | NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues); |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 407 | NULLB_DEVICE_ATTR(poll_queues, uint, nullb_apply_poll_queues); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 408 | NULLB_DEVICE_ATTR(home_node, uint, NULL); |
| 409 | NULLB_DEVICE_ATTR(queue_mode, uint, NULL); |
| 410 | NULLB_DEVICE_ATTR(blocksize, uint, NULL); |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 411 | NULLB_DEVICE_ATTR(max_sectors, uint, NULL); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 412 | NULLB_DEVICE_ATTR(irqmode, uint, NULL); |
| 413 | NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); |
| 414 | NULLB_DEVICE_ATTR(index, uint, NULL); |
| 415 | NULLB_DEVICE_ATTR(blocking, bool, NULL); |
| 416 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL); |
| 417 | NULLB_DEVICE_ATTR(memory_backed, bool, NULL); |
| 418 | NULLB_DEVICE_ATTR(discard, bool, NULL); |
| 419 | NULLB_DEVICE_ATTR(mbps, uint, NULL); |
| 420 | NULLB_DEVICE_ATTR(cache_size, ulong, NULL); |
| 421 | NULLB_DEVICE_ATTR(zoned, bool, NULL); |
| 422 | NULLB_DEVICE_ATTR(zone_size, ulong, NULL); |
Aravind Ramesh | 089565f | 2020-06-29 12:06:38 -0700 | [diff] [blame] | 423 | NULLB_DEVICE_ATTR(zone_capacity, ulong, NULL); |
Bart Van Assche | 45919fb | 2019-09-30 16:00:47 -0700 | [diff] [blame] | 424 | NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL); |
Niklas Cassel | dc4d137e | 2020-08-28 12:54:00 +0200 | [diff] [blame] | 425 | NULLB_DEVICE_ATTR(zone_max_open, uint, NULL); |
| 426 | NULLB_DEVICE_ATTR(zone_max_active, uint, NULL); |
Max Gurtovoy | cee1b21 | 2021-04-12 09:55:23 +0000 | [diff] [blame] | 427 | NULLB_DEVICE_ATTR(virt_boundary, bool, NULL); |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 428 | NULLB_DEVICE_ATTR(no_sched, bool, NULL); |
| 429 | NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL); |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 430 | |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 431 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
| 432 | { |
| 433 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); |
| 434 | } |
| 435 | |
| 436 | static ssize_t nullb_device_power_store(struct config_item *item, |
| 437 | const char *page, size_t count) |
| 438 | { |
| 439 | struct nullb_device *dev = to_nullb_device(item); |
| 440 | bool newp = false; |
| 441 | ssize_t ret; |
| 442 | |
| 443 | ret = nullb_device_bool_attr_store(&newp, page, count); |
| 444 | if (ret < 0) |
| 445 | return ret; |
| 446 | |
| 447 | if (!dev->power && newp) { |
| 448 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) |
| 449 | return count; |
Chaitanya Kulkarni | a75110c | 2022-02-15 03:59:51 -0800 | [diff] [blame] | 450 | ret = null_add_dev(dev); |
| 451 | if (ret) { |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 452 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); |
Chaitanya Kulkarni | a75110c | 2022-02-15 03:59:51 -0800 | [diff] [blame] | 453 | return ret; |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
| 457 | dev->power = newp; |
Jens Axboe | b3c3051 | 2017-08-28 15:06:31 -0600 | [diff] [blame] | 458 | } else if (dev->power && !newp) { |
Bob Liu | 7602843 | 2019-06-15 01:43:48 -0600 | [diff] [blame] | 459 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
| 460 | mutex_lock(&lock); |
| 461 | dev->power = newp; |
| 462 | null_del_dev(dev->nullb); |
| 463 | mutex_unlock(&lock); |
| 464 | } |
Liu Bo | 00a8cdb | 2018-07-06 03:07:13 +0800 | [diff] [blame] | 465 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | return count; |
| 469 | } |
| 470 | |
| 471 | CONFIGFS_ATTR(nullb_device_, power); |
| 472 | |
Shaohua Li | 2f54a61 | 2017-08-14 15:05:00 -0700 | [diff] [blame] | 473 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
| 474 | { |
| 475 | struct nullb_device *t_dev = to_nullb_device(item); |
| 476 | |
| 477 | return badblocks_show(&t_dev->badblocks, page, 0); |
| 478 | } |
| 479 | |
| 480 | static ssize_t nullb_device_badblocks_store(struct config_item *item, |
| 481 | const char *page, size_t count) |
| 482 | { |
| 483 | struct nullb_device *t_dev = to_nullb_device(item); |
| 484 | char *orig, *buf, *tmp; |
| 485 | u64 start, end; |
| 486 | int ret; |
| 487 | |
| 488 | orig = kstrndup(page, count, GFP_KERNEL); |
| 489 | if (!orig) |
| 490 | return -ENOMEM; |
| 491 | |
| 492 | buf = strstrip(orig); |
| 493 | |
| 494 | ret = -EINVAL; |
| 495 | if (buf[0] != '+' && buf[0] != '-') |
| 496 | goto out; |
| 497 | tmp = strchr(&buf[1], '-'); |
| 498 | if (!tmp) |
| 499 | goto out; |
| 500 | *tmp = '\0'; |
| 501 | ret = kstrtoull(buf + 1, 0, &start); |
| 502 | if (ret) |
| 503 | goto out; |
| 504 | ret = kstrtoull(tmp + 1, 0, &end); |
| 505 | if (ret) |
| 506 | goto out; |
| 507 | ret = -EINVAL; |
| 508 | if (start > end) |
| 509 | goto out; |
| 510 | /* enable badblocks */ |
| 511 | cmpxchg(&t_dev->badblocks.shift, -1, 0); |
| 512 | if (buf[0] == '+') |
| 513 | ret = badblocks_set(&t_dev->badblocks, start, |
| 514 | end - start + 1, 1); |
| 515 | else |
| 516 | ret = badblocks_clear(&t_dev->badblocks, start, |
| 517 | end - start + 1); |
| 518 | if (ret == 0) |
| 519 | ret = count; |
| 520 | out: |
| 521 | kfree(orig); |
| 522 | return ret; |
| 523 | } |
| 524 | CONFIGFS_ATTR(nullb_device_, badblocks); |
| 525 | |
Shin'ichiro Kawasaki | d3a5738 | 2022-12-01 15:10:36 +0900 | [diff] [blame] | 526 | static ssize_t nullb_device_zone_readonly_store(struct config_item *item, |
| 527 | const char *page, size_t count) |
| 528 | { |
| 529 | struct nullb_device *dev = to_nullb_device(item); |
| 530 | |
| 531 | return zone_cond_store(dev, page, count, BLK_ZONE_COND_READONLY); |
| 532 | } |
| 533 | CONFIGFS_ATTR_WO(nullb_device_, zone_readonly); |
| 534 | |
| 535 | static ssize_t nullb_device_zone_offline_store(struct config_item *item, |
| 536 | const char *page, size_t count) |
| 537 | { |
| 538 | struct nullb_device *dev = to_nullb_device(item); |
| 539 | |
| 540 | return zone_cond_store(dev, page, count, BLK_ZONE_COND_OFFLINE); |
| 541 | } |
| 542 | CONFIGFS_ATTR_WO(nullb_device_, zone_offline); |
| 543 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 544 | static struct configfs_attribute *nullb_device_attrs[] = { |
| 545 | &nullb_device_attr_size, |
| 546 | &nullb_device_attr_completion_nsec, |
| 547 | &nullb_device_attr_submit_queues, |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 548 | &nullb_device_attr_poll_queues, |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 549 | &nullb_device_attr_home_node, |
| 550 | &nullb_device_attr_queue_mode, |
| 551 | &nullb_device_attr_blocksize, |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 552 | &nullb_device_attr_max_sectors, |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 553 | &nullb_device_attr_irqmode, |
| 554 | &nullb_device_attr_hw_queue_depth, |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 555 | &nullb_device_attr_index, |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 556 | &nullb_device_attr_blocking, |
| 557 | &nullb_device_attr_use_per_node_hctx, |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 558 | &nullb_device_attr_power, |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 559 | &nullb_device_attr_memory_backed, |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 560 | &nullb_device_attr_discard, |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 561 | &nullb_device_attr_mbps, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 562 | &nullb_device_attr_cache_size, |
Shaohua Li | 2f54a61 | 2017-08-14 15:05:00 -0700 | [diff] [blame] | 563 | &nullb_device_attr_badblocks, |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 564 | &nullb_device_attr_zoned, |
| 565 | &nullb_device_attr_zone_size, |
Aravind Ramesh | 089565f | 2020-06-29 12:06:38 -0700 | [diff] [blame] | 566 | &nullb_device_attr_zone_capacity, |
Masato Suzuki | ea2c18e | 2018-10-30 16:14:05 +0900 | [diff] [blame] | 567 | &nullb_device_attr_zone_nr_conv, |
Niklas Cassel | dc4d137e | 2020-08-28 12:54:00 +0200 | [diff] [blame] | 568 | &nullb_device_attr_zone_max_open, |
| 569 | &nullb_device_attr_zone_max_active, |
Shin'ichiro Kawasaki | d3a5738 | 2022-12-01 15:10:36 +0900 | [diff] [blame] | 570 | &nullb_device_attr_zone_readonly, |
| 571 | &nullb_device_attr_zone_offline, |
Max Gurtovoy | cee1b21 | 2021-04-12 09:55:23 +0000 | [diff] [blame] | 572 | &nullb_device_attr_virt_boundary, |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 573 | &nullb_device_attr_no_sched, |
| 574 | &nullb_device_attr_shared_tag_bitmap, |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 575 | NULL, |
| 576 | }; |
| 577 | |
| 578 | static void nullb_device_release(struct config_item *item) |
| 579 | { |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 580 | struct nullb_device *dev = to_nullb_device(item); |
| 581 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 582 | null_free_device_storage(dev, false); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 583 | null_free_dev(dev); |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | static struct configfs_item_operations nullb_device_ops = { |
| 587 | .release = nullb_device_release, |
| 588 | }; |
| 589 | |
Bhumika Goyal | e1919df | 2017-10-16 17:18:49 +0200 | [diff] [blame] | 590 | static const struct config_item_type nullb_device_type = { |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 591 | .ct_item_ops = &nullb_device_ops, |
| 592 | .ct_attrs = nullb_device_attrs, |
| 593 | .ct_owner = THIS_MODULE, |
| 594 | }; |
| 595 | |
| 596 | static struct |
| 597 | config_item *nullb_group_make_item(struct config_group *group, const char *name) |
| 598 | { |
| 599 | struct nullb_device *dev; |
| 600 | |
Damien Le Moal | 49c3b92 | 2022-04-20 09:57:18 +0900 | [diff] [blame] | 601 | if (null_find_dev_by_name(name)) |
| 602 | return ERR_PTR(-EEXIST); |
| 603 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 604 | dev = null_alloc_dev(); |
| 605 | if (!dev) |
| 606 | return ERR_PTR(-ENOMEM); |
| 607 | |
| 608 | config_item_init_type_name(&dev->item, name, &nullb_device_type); |
| 609 | |
| 610 | return &dev->item; |
| 611 | } |
| 612 | |
| 613 | static void |
| 614 | nullb_group_drop_item(struct config_group *group, struct config_item *item) |
| 615 | { |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 616 | struct nullb_device *dev = to_nullb_device(item); |
| 617 | |
| 618 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
| 619 | mutex_lock(&lock); |
| 620 | dev->power = false; |
| 621 | null_del_dev(dev->nullb); |
| 622 | mutex_unlock(&lock); |
| 623 | } |
| 624 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 625 | config_item_put(item); |
| 626 | } |
| 627 | |
| 628 | static ssize_t memb_group_features_show(struct config_item *item, char *page) |
| 629 | { |
Aravind Ramesh | 089565f | 2020-06-29 12:06:38 -0700 | [diff] [blame] | 630 | return snprintf(page, PAGE_SIZE, |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 631 | "badblocks,blocking,blocksize,cache_size," |
| 632 | "completion_nsec,discard,home_node,hw_queue_depth," |
| 633 | "irqmode,max_sectors,mbps,memory_backed,no_sched," |
| 634 | "poll_queues,power,queue_mode,shared_tag_bitmap,size," |
| 635 | "submit_queues,use_per_node_hctx,virt_boundary,zoned," |
| 636 | "zone_capacity,zone_max_active,zone_max_open," |
Shin'ichiro Kawasaki | d3a5738 | 2022-12-01 15:10:36 +0900 | [diff] [blame] | 637 | "zone_nr_conv,zone_offline,zone_readonly,zone_size\n"); |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 638 | } |
| 639 | |
| 640 | CONFIGFS_ATTR_RO(memb_group_, features); |
| 641 | |
| 642 | static struct configfs_attribute *nullb_group_attrs[] = { |
| 643 | &memb_group_attr_features, |
| 644 | NULL, |
| 645 | }; |
| 646 | |
| 647 | static struct configfs_group_operations nullb_group_ops = { |
| 648 | .make_item = nullb_group_make_item, |
| 649 | .drop_item = nullb_group_drop_item, |
| 650 | }; |
| 651 | |
Bhumika Goyal | e1919df | 2017-10-16 17:18:49 +0200 | [diff] [blame] | 652 | static const struct config_item_type nullb_group_type = { |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 653 | .ct_group_ops = &nullb_group_ops, |
| 654 | .ct_attrs = nullb_group_attrs, |
| 655 | .ct_owner = THIS_MODULE, |
| 656 | }; |
| 657 | |
| 658 | static struct configfs_subsystem nullb_subsys = { |
| 659 | .su_group = { |
| 660 | .cg_item = { |
| 661 | .ci_namebuf = "nullb", |
| 662 | .ci_type = &nullb_group_type, |
| 663 | }, |
| 664 | }, |
| 665 | }; |
| 666 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 667 | static inline int null_cache_active(struct nullb *nullb) |
| 668 | { |
| 669 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); |
| 670 | } |
| 671 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 672 | static struct nullb_device *null_alloc_dev(void) |
| 673 | { |
| 674 | struct nullb_device *dev; |
| 675 | |
| 676 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 677 | if (!dev) |
| 678 | return NULL; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 679 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 680 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
Shaohua Li | 2f54a61 | 2017-08-14 15:05:00 -0700 | [diff] [blame] | 681 | if (badblocks_init(&dev->badblocks, 0)) { |
| 682 | kfree(dev); |
| 683 | return NULL; |
| 684 | } |
| 685 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 686 | dev->size = g_gb * 1024; |
| 687 | dev->completion_nsec = g_completion_nsec; |
| 688 | dev->submit_queues = g_submit_queues; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 689 | dev->prev_submit_queues = g_submit_queues; |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 690 | dev->poll_queues = g_poll_queues; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 691 | dev->prev_poll_queues = g_poll_queues; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 692 | dev->home_node = g_home_node; |
| 693 | dev->queue_mode = g_queue_mode; |
| 694 | dev->blocksize = g_bs; |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 695 | dev->max_sectors = g_max_sectors; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 696 | dev->irqmode = g_irqmode; |
| 697 | dev->hw_queue_depth = g_hw_queue_depth; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 698 | dev->blocking = g_blocking; |
Vincent Fu | 058efe0 | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 699 | dev->memory_backed = g_memory_backed; |
| 700 | dev->discard = g_discard; |
| 701 | dev->cache_size = g_cache_size; |
| 702 | dev->mbps = g_mbps; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 703 | dev->use_per_node_hctx = g_use_per_node_hctx; |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 704 | dev->zoned = g_zoned; |
| 705 | dev->zone_size = g_zone_size; |
Aravind Ramesh | 089565f | 2020-06-29 12:06:38 -0700 | [diff] [blame] | 706 | dev->zone_capacity = g_zone_capacity; |
Masato Suzuki | ea2c18e | 2018-10-30 16:14:05 +0900 | [diff] [blame] | 707 | dev->zone_nr_conv = g_zone_nr_conv; |
Niklas Cassel | dc4d137e | 2020-08-28 12:54:00 +0200 | [diff] [blame] | 708 | dev->zone_max_open = g_zone_max_open; |
| 709 | dev->zone_max_active = g_zone_max_active; |
Max Gurtovoy | cee1b21 | 2021-04-12 09:55:23 +0000 | [diff] [blame] | 710 | dev->virt_boundary = g_virt_boundary; |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 711 | dev->no_sched = g_no_sched; |
| 712 | dev->shared_tag_bitmap = g_shared_tag_bitmap; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 713 | return dev; |
| 714 | } |
| 715 | |
| 716 | static void null_free_dev(struct nullb_device *dev) |
| 717 | { |
David Disseldorp | 1addb79 | 2017-11-08 17:29:44 +0100 | [diff] [blame] | 718 | if (!dev) |
| 719 | return; |
| 720 | |
Damien Le Moal | d205bde | 2020-04-23 12:02:38 +0900 | [diff] [blame] | 721 | null_free_zoned_dev(dev); |
David Disseldorp | 1addb79 | 2017-11-08 17:29:44 +0100 | [diff] [blame] | 722 | badblocks_exit(&dev->badblocks); |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 723 | kfree(dev); |
| 724 | } |
| 725 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 726 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
| 727 | { |
| 728 | clear_bit_unlock(tag, nq->tag_map); |
| 729 | |
| 730 | if (waitqueue_active(&nq->wait)) |
| 731 | wake_up(&nq->wait); |
| 732 | } |
| 733 | |
| 734 | static unsigned int get_tag(struct nullb_queue *nq) |
| 735 | { |
| 736 | unsigned int tag; |
| 737 | |
| 738 | do { |
| 739 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); |
| 740 | if (tag >= nq->queue_depth) |
| 741 | return -1U; |
| 742 | } while (test_and_set_bit_lock(tag, nq->tag_map)); |
| 743 | |
| 744 | return tag; |
| 745 | } |
| 746 | |
| 747 | static void free_cmd(struct nullb_cmd *cmd) |
| 748 | { |
| 749 | put_tag(cmd->nq, cmd->tag); |
| 750 | } |
| 751 | |
Paolo Valente | 3c395a9 | 2015-12-01 11:48:17 +0100 | [diff] [blame] | 752 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
| 753 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 754 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
| 755 | { |
| 756 | struct nullb_cmd *cmd; |
| 757 | unsigned int tag; |
| 758 | |
| 759 | tag = get_tag(nq); |
| 760 | if (tag != -1U) { |
| 761 | cmd = &nq->cmds[tag]; |
| 762 | cmd->tag = tag; |
Alexey Dobriyan | ff770422 | 2020-02-12 23:23:20 +0300 | [diff] [blame] | 763 | cmd->error = BLK_STS_OK; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 764 | cmd->nq = nq; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 765 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
Paolo Valente | 3c395a9 | 2015-12-01 11:48:17 +0100 | [diff] [blame] | 766 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
| 767 | HRTIMER_MODE_REL); |
| 768 | cmd->timer.function = null_cmd_timer_expired; |
| 769 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 770 | return cmd; |
| 771 | } |
| 772 | |
| 773 | return NULL; |
| 774 | } |
| 775 | |
Chaitanya Kulkarni | 3d3472f | 2022-02-16 09:29:45 -0800 | [diff] [blame] | 776 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, struct bio *bio) |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 777 | { |
| 778 | struct nullb_cmd *cmd; |
| 779 | DEFINE_WAIT(wait); |
| 780 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 781 | do { |
Chaitanya Kulkarni | 3d3472f | 2022-02-16 09:29:45 -0800 | [diff] [blame] | 782 | /* |
| 783 | * This avoids multiple return statements, multiple calls to |
| 784 | * __alloc_cmd() and a fast path call to prepare_to_wait(). |
| 785 | */ |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 786 | cmd = __alloc_cmd(nq); |
Chaitanya Kulkarni | 3d3472f | 2022-02-16 09:29:45 -0800 | [diff] [blame] | 787 | if (cmd) { |
| 788 | cmd->bio = bio; |
| 789 | return cmd; |
| 790 | } |
| 791 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 792 | io_schedule(); |
Chaitanya Kulkarni | 3d3472f | 2022-02-16 09:29:45 -0800 | [diff] [blame] | 793 | finish_wait(&nq->wait, &wait); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 794 | } while (1); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | static void end_cmd(struct nullb_cmd *cmd) |
| 798 | { |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 799 | int queue_mode = cmd->nq->dev->queue_mode; |
Arianna Avanzini | cf8ecc5 | 2015-12-01 11:48:18 +0100 | [diff] [blame] | 800 | |
Christoph Hellwig | ce2c350 | 2014-02-10 03:24:40 -0800 | [diff] [blame] | 801 | switch (queue_mode) { |
| 802 | case NULL_Q_MQ: |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 803 | blk_mq_end_request(cmd->rq, cmd->error); |
Christoph Hellwig | ce2c350 | 2014-02-10 03:24:40 -0800 | [diff] [blame] | 804 | return; |
Christoph Hellwig | ce2c350 | 2014-02-10 03:24:40 -0800 | [diff] [blame] | 805 | case NULL_Q_BIO: |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 806 | cmd->bio->bi_status = cmd->error; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 807 | bio_endio(cmd->bio); |
Jens Axboe | 48cc661 | 2015-12-28 13:02:47 -0700 | [diff] [blame] | 808 | break; |
Christoph Hellwig | ce2c350 | 2014-02-10 03:24:40 -0800 | [diff] [blame] | 809 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 810 | |
Jens Axboe | 48cc661 | 2015-12-28 13:02:47 -0700 | [diff] [blame] | 811 | free_cmd(cmd); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 812 | } |
| 813 | |
| 814 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) |
| 815 | { |
Arianna Avanzini | cf8ecc5 | 2015-12-01 11:48:18 +0100 | [diff] [blame] | 816 | end_cmd(container_of(timer, struct nullb_cmd, timer)); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 817 | |
| 818 | return HRTIMER_NORESTART; |
| 819 | } |
| 820 | |
| 821 | static void null_cmd_end_timer(struct nullb_cmd *cmd) |
| 822 | { |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 823 | ktime_t kt = cmd->nq->dev->completion_nsec; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 824 | |
Paolo Valente | 3c395a9 | 2015-12-01 11:48:17 +0100 | [diff] [blame] | 825 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 826 | } |
| 827 | |
Christoph Hellwig | 49f6613 | 2018-11-10 09:30:45 +0100 | [diff] [blame] | 828 | static void null_complete_rq(struct request *rq) |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 829 | { |
Christoph Hellwig | 49f6613 | 2018-11-10 09:30:45 +0100 | [diff] [blame] | 830 | end_cmd(blk_mq_rq_to_pdu(rq)); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 831 | } |
| 832 | |
Chaitanya Kulkarni | c90b6b5 | 2022-02-22 07:28:51 -0800 | [diff] [blame] | 833 | static struct nullb_page *null_alloc_page(void) |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 834 | { |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 835 | struct nullb_page *t_page; |
| 836 | |
Chaitanya Kulkarni | c90b6b5 | 2022-02-22 07:28:51 -0800 | [diff] [blame] | 837 | t_page = kmalloc(sizeof(struct nullb_page), GFP_NOIO); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 838 | if (!t_page) |
Chaitanya Kulkarni | df00b1d | 2022-02-22 07:28:52 -0800 | [diff] [blame] | 839 | return NULL; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 840 | |
Chaitanya Kulkarni | c90b6b5 | 2022-02-22 07:28:51 -0800 | [diff] [blame] | 841 | t_page->page = alloc_pages(GFP_NOIO, 0); |
Chaitanya Kulkarni | df00b1d | 2022-02-22 07:28:52 -0800 | [diff] [blame] | 842 | if (!t_page->page) { |
| 843 | kfree(t_page); |
| 844 | return NULL; |
| 845 | } |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 846 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 847 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 848 | return t_page; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | static void null_free_page(struct nullb_page *t_page) |
| 852 | { |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 853 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
| 854 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 855 | return; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 856 | __free_page(t_page->page); |
| 857 | kfree(t_page); |
| 858 | } |
| 859 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 860 | static bool null_page_empty(struct nullb_page *page) |
| 861 | { |
| 862 | int size = MAP_SZ - 2; |
| 863 | |
| 864 | return find_first_bit(page->bitmap, size) == size; |
| 865 | } |
| 866 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 867 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
| 868 | bool is_cache) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 869 | { |
| 870 | unsigned int sector_bit; |
| 871 | u64 idx; |
| 872 | struct nullb_page *t_page, *ret; |
| 873 | struct radix_tree_root *root; |
| 874 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 875 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 876 | idx = sector >> PAGE_SECTORS_SHIFT; |
| 877 | sector_bit = (sector & SECTOR_MASK); |
| 878 | |
| 879 | t_page = radix_tree_lookup(root, idx); |
| 880 | if (t_page) { |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 881 | __clear_bit(sector_bit, t_page->bitmap); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 882 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 883 | if (null_page_empty(t_page)) { |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 884 | ret = radix_tree_delete_item(root, idx, t_page); |
| 885 | WARN_ON(ret != t_page); |
| 886 | null_free_page(ret); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 887 | if (is_cache) |
| 888 | nullb->dev->curr_cache -= PAGE_SIZE; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 889 | } |
| 890 | } |
| 891 | } |
| 892 | |
| 893 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 894 | struct nullb_page *t_page, bool is_cache) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 895 | { |
| 896 | struct radix_tree_root *root; |
| 897 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 898 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 899 | |
| 900 | if (radix_tree_insert(root, idx, t_page)) { |
| 901 | null_free_page(t_page); |
| 902 | t_page = radix_tree_lookup(root, idx); |
| 903 | WARN_ON(!t_page || t_page->page->index != idx); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 904 | } else if (is_cache) |
| 905 | nullb->dev->curr_cache += PAGE_SIZE; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 906 | |
| 907 | return t_page; |
| 908 | } |
| 909 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 910 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 911 | { |
| 912 | unsigned long pos = 0; |
| 913 | int nr_pages; |
| 914 | struct nullb_page *ret, *t_pages[FREE_BATCH]; |
| 915 | struct radix_tree_root *root; |
| 916 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 917 | root = is_cache ? &dev->cache : &dev->data; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 918 | |
| 919 | do { |
| 920 | int i; |
| 921 | |
| 922 | nr_pages = radix_tree_gang_lookup(root, |
| 923 | (void **)t_pages, pos, FREE_BATCH); |
| 924 | |
| 925 | for (i = 0; i < nr_pages; i++) { |
| 926 | pos = t_pages[i]->page->index; |
| 927 | ret = radix_tree_delete_item(root, pos, t_pages[i]); |
| 928 | WARN_ON(ret != t_pages[i]); |
| 929 | null_free_page(ret); |
| 930 | } |
| 931 | |
| 932 | pos++; |
| 933 | } while (nr_pages == FREE_BATCH); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 934 | |
| 935 | if (is_cache) |
| 936 | dev->curr_cache = 0; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 937 | } |
| 938 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 939 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
| 940 | sector_t sector, bool for_write, bool is_cache) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 941 | { |
| 942 | unsigned int sector_bit; |
| 943 | u64 idx; |
| 944 | struct nullb_page *t_page; |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 945 | struct radix_tree_root *root; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 946 | |
| 947 | idx = sector >> PAGE_SECTORS_SHIFT; |
| 948 | sector_bit = (sector & SECTOR_MASK); |
| 949 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 950 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
| 951 | t_page = radix_tree_lookup(root, idx); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 952 | WARN_ON(t_page && t_page->page->index != idx); |
| 953 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 954 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 955 | return t_page; |
| 956 | |
| 957 | return NULL; |
| 958 | } |
| 959 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 960 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
| 961 | sector_t sector, bool for_write, bool ignore_cache) |
| 962 | { |
| 963 | struct nullb_page *page = NULL; |
| 964 | |
| 965 | if (!ignore_cache) |
| 966 | page = __null_lookup_page(nullb, sector, for_write, true); |
| 967 | if (page) |
| 968 | return page; |
| 969 | return __null_lookup_page(nullb, sector, for_write, false); |
| 970 | } |
| 971 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 972 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
Jens Axboe | 61884de | 2018-08-09 14:22:41 -0600 | [diff] [blame] | 973 | sector_t sector, bool ignore_cache) |
| 974 | __releases(&nullb->lock) |
| 975 | __acquires(&nullb->lock) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 976 | { |
| 977 | u64 idx; |
| 978 | struct nullb_page *t_page; |
| 979 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 980 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 981 | if (t_page) |
| 982 | return t_page; |
| 983 | |
| 984 | spin_unlock_irq(&nullb->lock); |
| 985 | |
Chaitanya Kulkarni | c90b6b5 | 2022-02-22 07:28:51 -0800 | [diff] [blame] | 986 | t_page = null_alloc_page(); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 987 | if (!t_page) |
| 988 | goto out_lock; |
| 989 | |
| 990 | if (radix_tree_preload(GFP_NOIO)) |
| 991 | goto out_freepage; |
| 992 | |
| 993 | spin_lock_irq(&nullb->lock); |
| 994 | idx = sector >> PAGE_SECTORS_SHIFT; |
| 995 | t_page->page->index = idx; |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 996 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 997 | radix_tree_preload_end(); |
| 998 | |
| 999 | return t_page; |
| 1000 | out_freepage: |
| 1001 | null_free_page(t_page); |
| 1002 | out_lock: |
| 1003 | spin_lock_irq(&nullb->lock); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1004 | return null_lookup_page(nullb, sector, true, ignore_cache); |
| 1005 | } |
| 1006 | |
| 1007 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) |
| 1008 | { |
| 1009 | int i; |
| 1010 | unsigned int offset; |
| 1011 | u64 idx; |
| 1012 | struct nullb_page *t_page, *ret; |
| 1013 | void *dst, *src; |
| 1014 | |
| 1015 | idx = c_page->page->index; |
| 1016 | |
| 1017 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); |
| 1018 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1019 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
| 1020 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1021 | null_free_page(c_page); |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1022 | if (t_page && null_page_empty(t_page)) { |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1023 | ret = radix_tree_delete_item(&nullb->dev->data, |
| 1024 | idx, t_page); |
| 1025 | null_free_page(t_page); |
| 1026 | } |
| 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | if (!t_page) |
| 1031 | return -ENOMEM; |
| 1032 | |
| 1033 | src = kmap_atomic(c_page->page); |
| 1034 | dst = kmap_atomic(t_page->page); |
| 1035 | |
| 1036 | for (i = 0; i < PAGE_SECTORS; |
| 1037 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1038 | if (test_bit(i, c_page->bitmap)) { |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1039 | offset = (i << SECTOR_SHIFT); |
| 1040 | memcpy(dst + offset, src + offset, |
| 1041 | nullb->dev->blocksize); |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1042 | __set_bit(i, t_page->bitmap); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | kunmap_atomic(dst); |
| 1047 | kunmap_atomic(src); |
| 1048 | |
| 1049 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); |
| 1050 | null_free_page(ret); |
| 1051 | nullb->dev->curr_cache -= PAGE_SIZE; |
| 1052 | |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
| 1056 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) |
| 1057 | { |
| 1058 | int i, err, nr_pages; |
| 1059 | struct nullb_page *c_pages[FREE_BATCH]; |
| 1060 | unsigned long flushed = 0, one_round; |
| 1061 | |
| 1062 | again: |
| 1063 | if ((nullb->dev->cache_size * 1024 * 1024) > |
| 1064 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) |
| 1065 | return 0; |
| 1066 | |
| 1067 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, |
| 1068 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); |
| 1069 | /* |
| 1070 | * nullb_flush_cache_page could unlock before using the c_pages. To |
| 1071 | * avoid race, we don't allow page free |
| 1072 | */ |
| 1073 | for (i = 0; i < nr_pages; i++) { |
| 1074 | nullb->cache_flush_pos = c_pages[i]->page->index; |
| 1075 | /* |
| 1076 | * We found the page which is being flushed to disk by other |
| 1077 | * threads |
| 1078 | */ |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1079 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1080 | c_pages[i] = NULL; |
| 1081 | else |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1082 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | one_round = 0; |
| 1086 | for (i = 0; i < nr_pages; i++) { |
| 1087 | if (c_pages[i] == NULL) |
| 1088 | continue; |
| 1089 | err = null_flush_cache_page(nullb, c_pages[i]); |
| 1090 | if (err) |
| 1091 | return err; |
| 1092 | one_round++; |
| 1093 | } |
| 1094 | flushed += one_round << PAGE_SHIFT; |
| 1095 | |
| 1096 | if (n > flushed) { |
| 1097 | if (nr_pages == 0) |
| 1098 | nullb->cache_flush_pos = 0; |
| 1099 | if (one_round == 0) { |
| 1100 | /* give other threads a chance */ |
| 1101 | spin_unlock_irq(&nullb->lock); |
| 1102 | spin_lock_irq(&nullb->lock); |
| 1103 | } |
| 1104 | goto again; |
| 1105 | } |
| 1106 | return 0; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | static int copy_to_nullb(struct nullb *nullb, struct page *source, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1110 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1111 | { |
| 1112 | size_t temp, count = 0; |
| 1113 | unsigned int offset; |
| 1114 | struct nullb_page *t_page; |
| 1115 | void *dst, *src; |
| 1116 | |
| 1117 | while (count < n) { |
| 1118 | temp = min_t(size_t, nullb->dev->blocksize, n - count); |
| 1119 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1120 | if (null_cache_active(nullb) && !is_fua) |
| 1121 | null_make_cache_space(nullb, PAGE_SIZE); |
| 1122 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1123 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1124 | t_page = null_insert_page(nullb, sector, |
| 1125 | !null_cache_active(nullb) || is_fua); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1126 | if (!t_page) |
| 1127 | return -ENOSPC; |
| 1128 | |
| 1129 | src = kmap_atomic(source); |
| 1130 | dst = kmap_atomic(t_page->page); |
| 1131 | memcpy(dst + offset, src + off + count, temp); |
| 1132 | kunmap_atomic(dst); |
| 1133 | kunmap_atomic(src); |
| 1134 | |
Ming Lei | 66231ad | 2018-03-06 12:07:13 +0800 | [diff] [blame] | 1135 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1136 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1137 | if (is_fua) |
| 1138 | null_free_sector(nullb, sector, true); |
| 1139 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1140 | count += temp; |
| 1141 | sector += temp >> SECTOR_SHIFT; |
| 1142 | } |
| 1143 | return 0; |
| 1144 | } |
| 1145 | |
| 1146 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, |
| 1147 | unsigned int off, sector_t sector, size_t n) |
| 1148 | { |
| 1149 | size_t temp, count = 0; |
| 1150 | unsigned int offset; |
| 1151 | struct nullb_page *t_page; |
| 1152 | void *dst, *src; |
| 1153 | |
| 1154 | while (count < n) { |
| 1155 | temp = min_t(size_t, nullb->dev->blocksize, n - count); |
| 1156 | |
| 1157 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1158 | t_page = null_lookup_page(nullb, sector, false, |
| 1159 | !null_cache_active(nullb)); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1160 | |
| 1161 | dst = kmap_atomic(dest); |
| 1162 | if (!t_page) { |
| 1163 | memset(dst + off + count, 0, temp); |
| 1164 | goto next; |
| 1165 | } |
| 1166 | src = kmap_atomic(t_page->page); |
| 1167 | memcpy(dst + off + count, src + offset, temp); |
| 1168 | kunmap_atomic(src); |
| 1169 | next: |
| 1170 | kunmap_atomic(dst); |
| 1171 | |
| 1172 | count += temp; |
| 1173 | sector += temp >> SECTOR_SHIFT; |
| 1174 | } |
| 1175 | return 0; |
| 1176 | } |
| 1177 | |
Ajay Joshi | dd85b49 | 2019-10-17 14:19:43 -0700 | [diff] [blame] | 1178 | static void nullb_fill_pattern(struct nullb *nullb, struct page *page, |
| 1179 | unsigned int len, unsigned int off) |
| 1180 | { |
| 1181 | void *dst; |
| 1182 | |
| 1183 | dst = kmap_atomic(page); |
| 1184 | memset(dst + off, 0xFF, len); |
| 1185 | kunmap_atomic(dst); |
| 1186 | } |
| 1187 | |
Damien Le Moal | 0ec4d91 | 2020-11-20 10:55:17 +0900 | [diff] [blame] | 1188 | blk_status_t null_handle_discard(struct nullb_device *dev, |
| 1189 | sector_t sector, sector_t nr_sectors) |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1190 | { |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1191 | struct nullb *nullb = dev->nullb; |
| 1192 | size_t n = nr_sectors << SECTOR_SHIFT; |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1193 | size_t temp; |
| 1194 | |
| 1195 | spin_lock_irq(&nullb->lock); |
| 1196 | while (n > 0) { |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1197 | temp = min_t(size_t, n, dev->blocksize); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1198 | null_free_sector(nullb, sector, false); |
| 1199 | if (null_cache_active(nullb)) |
| 1200 | null_free_sector(nullb, sector, true); |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1201 | sector += temp >> SECTOR_SHIFT; |
| 1202 | n -= temp; |
| 1203 | } |
| 1204 | spin_unlock_irq(&nullb->lock); |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1205 | |
| 1206 | return BLK_STS_OK; |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1207 | } |
| 1208 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1209 | static int null_handle_flush(struct nullb *nullb) |
| 1210 | { |
| 1211 | int err; |
| 1212 | |
| 1213 | if (!null_cache_active(nullb)) |
| 1214 | return 0; |
| 1215 | |
| 1216 | spin_lock_irq(&nullb->lock); |
| 1217 | while (true) { |
| 1218 | err = null_make_cache_space(nullb, |
| 1219 | nullb->dev->cache_size * 1024 * 1024); |
| 1220 | if (err || nullb->dev->curr_cache == 0) |
| 1221 | break; |
| 1222 | } |
| 1223 | |
| 1224 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); |
| 1225 | spin_unlock_irq(&nullb->lock); |
| 1226 | return err; |
| 1227 | } |
| 1228 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1229 | static int null_transfer(struct nullb *nullb, struct page *page, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1230 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
| 1231 | bool is_fua) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1232 | { |
Ajay Joshi | dd85b49 | 2019-10-17 14:19:43 -0700 | [diff] [blame] | 1233 | struct nullb_device *dev = nullb->dev; |
| 1234 | unsigned int valid_len = len; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1235 | int err = 0; |
| 1236 | |
| 1237 | if (!is_write) { |
Ajay Joshi | dd85b49 | 2019-10-17 14:19:43 -0700 | [diff] [blame] | 1238 | if (dev->zoned) |
| 1239 | valid_len = null_zone_valid_read_len(nullb, |
| 1240 | sector, len); |
| 1241 | |
| 1242 | if (valid_len) { |
| 1243 | err = copy_from_nullb(nullb, page, off, |
| 1244 | sector, valid_len); |
| 1245 | off += valid_len; |
| 1246 | len -= valid_len; |
| 1247 | } |
| 1248 | |
| 1249 | if (len) |
| 1250 | nullb_fill_pattern(nullb, page, len, off); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1251 | flush_dcache_page(page); |
| 1252 | } else { |
| 1253 | flush_dcache_page(page); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1254 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1255 | } |
| 1256 | |
| 1257 | return err; |
| 1258 | } |
| 1259 | |
| 1260 | static int null_handle_rq(struct nullb_cmd *cmd) |
| 1261 | { |
| 1262 | struct request *rq = cmd->rq; |
| 1263 | struct nullb *nullb = cmd->nq->dev->nullb; |
| 1264 | int err; |
| 1265 | unsigned int len; |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1266 | sector_t sector = blk_rq_pos(rq); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1267 | struct req_iterator iter; |
| 1268 | struct bio_vec bvec; |
| 1269 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1270 | spin_lock_irq(&nullb->lock); |
| 1271 | rq_for_each_segment(bvec, rq, iter) { |
| 1272 | len = bvec.bv_len; |
| 1273 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1274 | op_is_write(req_op(rq)), sector, |
Hou Pu | 2d62e6b | 2020-08-21 04:34:42 -0400 | [diff] [blame] | 1275 | rq->cmd_flags & REQ_FUA); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1276 | if (err) { |
| 1277 | spin_unlock_irq(&nullb->lock); |
| 1278 | return err; |
| 1279 | } |
| 1280 | sector += len >> SECTOR_SHIFT; |
| 1281 | } |
| 1282 | spin_unlock_irq(&nullb->lock); |
| 1283 | |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
| 1287 | static int null_handle_bio(struct nullb_cmd *cmd) |
| 1288 | { |
| 1289 | struct bio *bio = cmd->bio; |
| 1290 | struct nullb *nullb = cmd->nq->dev->nullb; |
| 1291 | int err; |
| 1292 | unsigned int len; |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1293 | sector_t sector = bio->bi_iter.bi_sector; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1294 | struct bio_vec bvec; |
| 1295 | struct bvec_iter iter; |
| 1296 | |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1297 | spin_lock_irq(&nullb->lock); |
| 1298 | bio_for_each_segment(bvec, bio, iter) { |
| 1299 | len = bvec.bv_len; |
| 1300 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1301 | op_is_write(bio_op(bio)), sector, |
Heinz Mauelshagen | bf7c7a0 | 2019-02-22 20:00:01 +0100 | [diff] [blame] | 1302 | bio->bi_opf & REQ_FUA); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1303 | if (err) { |
| 1304 | spin_unlock_irq(&nullb->lock); |
| 1305 | return err; |
| 1306 | } |
| 1307 | sector += len >> SECTOR_SHIFT; |
| 1308 | } |
| 1309 | spin_unlock_irq(&nullb->lock); |
| 1310 | return 0; |
| 1311 | } |
| 1312 | |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1313 | static void null_stop_queue(struct nullb *nullb) |
| 1314 | { |
| 1315 | struct request_queue *q = nullb->q; |
| 1316 | |
| 1317 | if (nullb->dev->queue_mode == NULL_Q_MQ) |
| 1318 | blk_mq_stop_hw_queues(q); |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1319 | } |
| 1320 | |
| 1321 | static void null_restart_queue_async(struct nullb *nullb) |
| 1322 | { |
| 1323 | struct request_queue *q = nullb->q; |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1324 | |
| 1325 | if (nullb->dev->queue_mode == NULL_Q_MQ) |
| 1326 | blk_mq_start_stopped_hw_queues(q, true); |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1327 | } |
| 1328 | |
Chaitanya Kulkarni | adb8428 | 2019-08-22 21:45:15 -0700 | [diff] [blame] | 1329 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
| 1330 | { |
| 1331 | struct nullb_device *dev = cmd->nq->dev; |
| 1332 | struct nullb *nullb = dev->nullb; |
| 1333 | blk_status_t sts = BLK_STS_OK; |
| 1334 | struct request *rq = cmd->rq; |
| 1335 | |
| 1336 | if (!hrtimer_active(&nullb->bw_timer)) |
| 1337 | hrtimer_restart(&nullb->bw_timer); |
| 1338 | |
| 1339 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { |
| 1340 | null_stop_queue(nullb); |
| 1341 | /* race with timer */ |
| 1342 | if (atomic_long_read(&nullb->cur_bytes) > 0) |
| 1343 | null_restart_queue_async(nullb); |
| 1344 | /* requeue request */ |
| 1345 | sts = BLK_STS_DEV_RESOURCE; |
| 1346 | } |
| 1347 | return sts; |
| 1348 | } |
| 1349 | |
Chaitanya Kulkarni | 8f94d1c | 2019-08-22 21:45:16 -0700 | [diff] [blame] | 1350 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
| 1351 | sector_t sector, |
| 1352 | sector_t nr_sectors) |
| 1353 | { |
| 1354 | struct badblocks *bb = &cmd->nq->dev->badblocks; |
| 1355 | sector_t first_bad; |
| 1356 | int bad_sectors; |
| 1357 | |
| 1358 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) |
| 1359 | return BLK_STS_IOERR; |
| 1360 | |
| 1361 | return BLK_STS_OK; |
| 1362 | } |
| 1363 | |
Chaitanya Kulkarni | 7ea88e2 | 2019-08-22 21:45:17 -0700 | [diff] [blame] | 1364 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
Bart Van Assche | ff07a02 | 2022-07-14 11:06:27 -0700 | [diff] [blame] | 1365 | enum req_op op, |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1366 | sector_t sector, |
| 1367 | sector_t nr_sectors) |
Chaitanya Kulkarni | 7ea88e2 | 2019-08-22 21:45:17 -0700 | [diff] [blame] | 1368 | { |
| 1369 | struct nullb_device *dev = cmd->nq->dev; |
| 1370 | int err; |
| 1371 | |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1372 | if (op == REQ_OP_DISCARD) |
| 1373 | return null_handle_discard(dev, sector, nr_sectors); |
| 1374 | |
Chaitanya Kulkarni | 7ea88e2 | 2019-08-22 21:45:17 -0700 | [diff] [blame] | 1375 | if (dev->queue_mode == NULL_Q_BIO) |
| 1376 | err = null_handle_bio(cmd); |
| 1377 | else |
| 1378 | err = null_handle_rq(cmd); |
| 1379 | |
| 1380 | return errno_to_blk_status(err); |
| 1381 | } |
| 1382 | |
Bart Van Assche | cecbc9c | 2020-05-18 21:07:37 -0700 | [diff] [blame] | 1383 | static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd) |
| 1384 | { |
| 1385 | struct nullb_device *dev = cmd->nq->dev; |
| 1386 | struct bio *bio; |
| 1387 | |
| 1388 | if (dev->memory_backed) |
| 1389 | return; |
| 1390 | |
| 1391 | if (dev->queue_mode == NULL_Q_BIO && bio_op(cmd->bio) == REQ_OP_READ) { |
| 1392 | zero_fill_bio(cmd->bio); |
| 1393 | } else if (req_op(cmd->rq) == REQ_OP_READ) { |
| 1394 | __rq_for_each_bio(bio, cmd->rq) |
| 1395 | zero_fill_bio(bio); |
| 1396 | } |
| 1397 | } |
| 1398 | |
Chaitanya Kulkarni | a3d7d67 | 2019-08-22 21:45:19 -0700 | [diff] [blame] | 1399 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
| 1400 | { |
Bart Van Assche | cecbc9c | 2020-05-18 21:07:37 -0700 | [diff] [blame] | 1401 | /* |
| 1402 | * Since root privileges are required to configure the null_blk |
| 1403 | * driver, it is fine that this driver does not initialize the |
| 1404 | * data buffers of read commands. Zero-initialize these buffers |
| 1405 | * anyway if KMSAN is enabled to prevent that KMSAN complains |
| 1406 | * about null_blk not initializing read data buffers. |
| 1407 | */ |
| 1408 | if (IS_ENABLED(CONFIG_KMSAN)) |
| 1409 | nullb_zero_read_cmd_buffer(cmd); |
| 1410 | |
Chaitanya Kulkarni | a3d7d67 | 2019-08-22 21:45:19 -0700 | [diff] [blame] | 1411 | /* Complete IO by inline, softirq or timer */ |
| 1412 | switch (cmd->nq->dev->irqmode) { |
| 1413 | case NULL_IRQ_SOFTIRQ: |
| 1414 | switch (cmd->nq->dev->queue_mode) { |
| 1415 | case NULL_Q_MQ: |
Christoph Hellwig | 15f73f5 | 2020-06-11 08:44:47 +0200 | [diff] [blame] | 1416 | if (likely(!blk_should_fake_timeout(cmd->rq->q))) |
| 1417 | blk_mq_complete_request(cmd->rq); |
Chaitanya Kulkarni | a3d7d67 | 2019-08-22 21:45:19 -0700 | [diff] [blame] | 1418 | break; |
| 1419 | case NULL_Q_BIO: |
| 1420 | /* |
| 1421 | * XXX: no proper submitting cpu information available. |
| 1422 | */ |
| 1423 | end_cmd(cmd); |
| 1424 | break; |
| 1425 | } |
| 1426 | break; |
| 1427 | case NULL_IRQ_NONE: |
| 1428 | end_cmd(cmd); |
| 1429 | break; |
| 1430 | case NULL_IRQ_TIMER: |
| 1431 | null_cmd_end_timer(cmd); |
| 1432 | break; |
| 1433 | } |
| 1434 | } |
| 1435 | |
Bart Van Assche | ff07a02 | 2022-07-14 11:06:27 -0700 | [diff] [blame] | 1436 | blk_status_t null_process_cmd(struct nullb_cmd *cmd, enum req_op op, |
| 1437 | sector_t sector, unsigned int nr_sectors) |
Damien Le Moal | 9dd44c7 | 2020-04-23 12:02:37 +0900 | [diff] [blame] | 1438 | { |
| 1439 | struct nullb_device *dev = cmd->nq->dev; |
| 1440 | blk_status_t ret; |
| 1441 | |
| 1442 | if (dev->badblocks.shift != -1) { |
| 1443 | ret = null_handle_badblocks(cmd, sector, nr_sectors); |
| 1444 | if (ret != BLK_STS_OK) |
| 1445 | return ret; |
| 1446 | } |
| 1447 | |
| 1448 | if (dev->memory_backed) |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1449 | return null_handle_memory_backed(cmd, op, sector, nr_sectors); |
Damien Le Moal | 9dd44c7 | 2020-04-23 12:02:37 +0900 | [diff] [blame] | 1450 | |
| 1451 | return BLK_STS_OK; |
| 1452 | } |
| 1453 | |
Chaitanya Kulkarni | d4b186e | 2019-08-22 21:45:14 -0700 | [diff] [blame] | 1454 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
Bart Van Assche | ff07a02 | 2022-07-14 11:06:27 -0700 | [diff] [blame] | 1455 | sector_t nr_sectors, enum req_op op) |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1456 | { |
| 1457 | struct nullb_device *dev = cmd->nq->dev; |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1458 | struct nullb *nullb = dev->nullb; |
Chaitanya Kulkarni | adb8428 | 2019-08-22 21:45:15 -0700 | [diff] [blame] | 1459 | blk_status_t sts; |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1460 | |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1461 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
Chaitanya Kulkarni | adb8428 | 2019-08-22 21:45:15 -0700 | [diff] [blame] | 1462 | sts = null_handle_throttled(cmd); |
| 1463 | if (sts != BLK_STS_OK) |
| 1464 | return sts; |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1465 | } |
| 1466 | |
Chaitanya Kulkarni | d4b186e | 2019-08-22 21:45:14 -0700 | [diff] [blame] | 1467 | if (op == REQ_OP_FLUSH) { |
| 1468 | cmd->error = errno_to_blk_status(null_handle_flush(nullb)); |
| 1469 | goto out; |
| 1470 | } |
Shaohua Li | 2f54a61 | 2017-08-14 15:05:00 -0700 | [diff] [blame] | 1471 | |
Damien Le Moal | 9dd44c7 | 2020-04-23 12:02:37 +0900 | [diff] [blame] | 1472 | if (dev->zoned) |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1473 | sts = null_process_zoned_cmd(cmd, op, sector, nr_sectors); |
Damien Le Moal | 9dd44c7 | 2020-04-23 12:02:37 +0900 | [diff] [blame] | 1474 | else |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1475 | sts = null_process_cmd(cmd, op, sector, nr_sectors); |
| 1476 | |
| 1477 | /* Do not overwrite errors (e.g. timeout errors) */ |
| 1478 | if (cmd->error == BLK_STS_OK) |
| 1479 | cmd->error = sts; |
Chaitanya Kulkarni | fceb5d1 | 2019-08-22 21:45:18 -0700 | [diff] [blame] | 1480 | |
Shaohua Li | 2f54a61 | 2017-08-14 15:05:00 -0700 | [diff] [blame] | 1481 | out: |
Chaitanya Kulkarni | a3d7d67 | 2019-08-22 21:45:19 -0700 | [diff] [blame] | 1482 | nullb_complete_cmd(cmd); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1483 | return BLK_STS_OK; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1484 | } |
| 1485 | |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1486 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
| 1487 | { |
| 1488 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); |
| 1489 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); |
| 1490 | unsigned int mbps = nullb->dev->mbps; |
| 1491 | |
| 1492 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) |
| 1493 | return HRTIMER_NORESTART; |
| 1494 | |
| 1495 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); |
| 1496 | null_restart_queue_async(nullb); |
| 1497 | |
| 1498 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); |
| 1499 | |
| 1500 | return HRTIMER_RESTART; |
| 1501 | } |
| 1502 | |
| 1503 | static void nullb_setup_bwtimer(struct nullb *nullb) |
| 1504 | { |
| 1505 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); |
| 1506 | |
| 1507 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1508 | nullb->bw_timer.function = nullb_bwtimer_fn; |
| 1509 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); |
| 1510 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1511 | } |
| 1512 | |
| 1513 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) |
| 1514 | { |
| 1515 | int index = 0; |
| 1516 | |
| 1517 | if (nullb->nr_queues != 1) |
| 1518 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); |
| 1519 | |
| 1520 | return &nullb->queues[index]; |
| 1521 | } |
| 1522 | |
Christoph Hellwig | 3e08773 | 2021-10-12 13:12:24 +0200 | [diff] [blame] | 1523 | static void null_submit_bio(struct bio *bio) |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1524 | { |
Chaitanya Kulkarni | d4b186e | 2019-08-22 21:45:14 -0700 | [diff] [blame] | 1525 | sector_t sector = bio->bi_iter.bi_sector; |
| 1526 | sector_t nr_sectors = bio_sectors(bio); |
Christoph Hellwig | 309dca30 | 2021-01-24 11:02:34 +0100 | [diff] [blame] | 1527 | struct nullb *nullb = bio->bi_bdev->bd_disk->private_data; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1528 | struct nullb_queue *nq = nullb_to_queue(nullb); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1529 | |
Chaitanya Kulkarni | 3d3472f | 2022-02-16 09:29:45 -0800 | [diff] [blame] | 1530 | null_handle_cmd(alloc_cmd(nq, bio), sector, nr_sectors, bio_op(bio)); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1531 | } |
| 1532 | |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 1533 | static bool should_timeout_request(struct request *rq) |
| 1534 | { |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 1535 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 1536 | if (g_timeout_str[0]) |
| 1537 | return should_fail(&null_timeout_attr, 1); |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 1538 | #endif |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 1539 | return false; |
| 1540 | } |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 1541 | |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 1542 | static bool should_requeue_request(struct request *rq) |
| 1543 | { |
| 1544 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
| 1545 | if (g_requeue_str[0]) |
| 1546 | return should_fail(&null_requeue_attr, 1); |
| 1547 | #endif |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 1548 | return false; |
| 1549 | } |
| 1550 | |
Bart Van Assche | a4e1d0b | 2022-08-15 10:00:43 -0700 | [diff] [blame] | 1551 | static void null_map_queues(struct blk_mq_tag_set *set) |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1552 | { |
| 1553 | struct nullb *nullb = set->driver_data; |
| 1554 | int i, qoff; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 1555 | unsigned int submit_queues = g_submit_queues; |
| 1556 | unsigned int poll_queues = g_poll_queues; |
| 1557 | |
| 1558 | if (nullb) { |
| 1559 | struct nullb_device *dev = nullb->dev; |
| 1560 | |
| 1561 | /* |
| 1562 | * Refer nr_hw_queues of the tag set to check if the expected |
| 1563 | * number of hardware queues are prepared. If block layer failed |
| 1564 | * to prepare them, use previous numbers of submit queues and |
| 1565 | * poll queues to map queues. |
| 1566 | */ |
| 1567 | if (set->nr_hw_queues == |
| 1568 | dev->submit_queues + dev->poll_queues) { |
| 1569 | submit_queues = dev->submit_queues; |
| 1570 | poll_queues = dev->poll_queues; |
| 1571 | } else if (set->nr_hw_queues == |
| 1572 | dev->prev_submit_queues + dev->prev_poll_queues) { |
| 1573 | submit_queues = dev->prev_submit_queues; |
| 1574 | poll_queues = dev->prev_poll_queues; |
| 1575 | } else { |
| 1576 | pr_warn("tag set has unexpected nr_hw_queues: %d\n", |
| 1577 | set->nr_hw_queues); |
Bart Van Assche | 10b41ea | 2022-08-15 10:00:42 -0700 | [diff] [blame] | 1578 | WARN_ON_ONCE(true); |
| 1579 | submit_queues = 1; |
| 1580 | poll_queues = 0; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 1581 | } |
| 1582 | } |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1583 | |
| 1584 | for (i = 0, qoff = 0; i < set->nr_maps; i++) { |
| 1585 | struct blk_mq_queue_map *map = &set->map[i]; |
| 1586 | |
| 1587 | switch (i) { |
| 1588 | case HCTX_TYPE_DEFAULT: |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 1589 | map->nr_queues = submit_queues; |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1590 | break; |
| 1591 | case HCTX_TYPE_READ: |
| 1592 | map->nr_queues = 0; |
| 1593 | continue; |
| 1594 | case HCTX_TYPE_POLL: |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 1595 | map->nr_queues = poll_queues; |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1596 | break; |
| 1597 | } |
| 1598 | map->queue_offset = qoff; |
| 1599 | qoff += map->nr_queues; |
| 1600 | blk_mq_map_queues(map); |
| 1601 | } |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1602 | } |
| 1603 | |
| 1604 | static int null_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob) |
| 1605 | { |
| 1606 | struct nullb_queue *nq = hctx->driver_data; |
| 1607 | LIST_HEAD(list); |
| 1608 | int nr = 0; |
| 1609 | |
| 1610 | spin_lock(&nq->poll_lock); |
| 1611 | list_splice_init(&nq->poll_list, &list); |
| 1612 | spin_unlock(&nq->poll_lock); |
| 1613 | |
| 1614 | while (!list_empty(&list)) { |
| 1615 | struct nullb_cmd *cmd; |
| 1616 | struct request *req; |
| 1617 | |
| 1618 | req = list_first_entry(&list, struct request, queuelist); |
| 1619 | list_del_init(&req->queuelist); |
| 1620 | cmd = blk_mq_rq_to_pdu(req); |
| 1621 | cmd->error = null_process_cmd(cmd, req_op(req), blk_rq_pos(req), |
| 1622 | blk_rq_sectors(req)); |
Jens Axboe | c5eafd7 | 2021-12-10 16:32:44 -0700 | [diff] [blame] | 1623 | if (!blk_mq_add_to_batch(req, iob, (__force int) cmd->error, |
Ming Lei | 2385ebf | 2021-12-03 16:17:03 +0800 | [diff] [blame] | 1624 | blk_mq_end_request_batch)) |
| 1625 | end_cmd(cmd); |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1626 | nr++; |
| 1627 | } |
| 1628 | |
| 1629 | return nr; |
| 1630 | } |
| 1631 | |
John Garry | 9bdb483 | 2022-07-06 20:03:51 +0800 | [diff] [blame] | 1632 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq) |
Jens Axboe | 5448aca | 2018-01-09 12:47:24 -0700 | [diff] [blame] | 1633 | { |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1634 | struct blk_mq_hw_ctx *hctx = rq->mq_hctx; |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1635 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); |
| 1636 | |
André Almeida | 9c7eddf | 2019-09-16 11:07:59 -0300 | [diff] [blame] | 1637 | pr_info("rq %p timed out\n", rq); |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1638 | |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1639 | if (hctx->type == HCTX_TYPE_POLL) { |
| 1640 | struct nullb_queue *nq = hctx->driver_data; |
| 1641 | |
| 1642 | spin_lock(&nq->poll_lock); |
| 1643 | list_del_init(&rq->queuelist); |
| 1644 | spin_unlock(&nq->poll_lock); |
| 1645 | } |
| 1646 | |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1647 | /* |
| 1648 | * If the device is marked as blocking (i.e. memory backed or zoned |
| 1649 | * device), the submission path may be blocked waiting for resources |
| 1650 | * and cause real timeouts. For these real timeouts, the submission |
| 1651 | * path will complete the request using blk_mq_complete_request(). |
| 1652 | * Only fake timeouts need to execute blk_mq_complete_request() here. |
| 1653 | */ |
| 1654 | cmd->error = BLK_STS_TIMEOUT; |
Ming Lei | 3e3876d | 2022-04-13 16:48:36 +0800 | [diff] [blame] | 1655 | if (cmd->fake_timeout || hctx->type == HCTX_TYPE_POLL) |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1656 | blk_mq_complete_request(rq); |
Christoph Hellwig | 0df0bb0 | 2018-05-29 15:52:33 +0200 | [diff] [blame] | 1657 | return BLK_EH_DONE; |
Jens Axboe | 5448aca | 2018-01-09 12:47:24 -0700 | [diff] [blame] | 1658 | } |
| 1659 | |
Christoph Hellwig | fc17b65 | 2017-06-03 09:38:05 +0200 | [diff] [blame] | 1660 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 1661 | const struct blk_mq_queue_data *bd) |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1662 | { |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 1663 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1664 | struct nullb_queue *nq = hctx->driver_data; |
Chaitanya Kulkarni | d4b186e | 2019-08-22 21:45:14 -0700 | [diff] [blame] | 1665 | sector_t nr_sectors = blk_rq_sectors(bd->rq); |
| 1666 | sector_t sector = blk_rq_pos(bd->rq); |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1667 | const bool is_poll = hctx->type == HCTX_TYPE_POLL; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1668 | |
Jens Axboe | db5bcf8 | 2017-03-30 13:44:26 -0600 | [diff] [blame] | 1669 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
| 1670 | |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1671 | if (!is_poll && nq->dev->irqmode == NULL_IRQ_TIMER) { |
Paolo Valente | 3c395a9 | 2015-12-01 11:48:17 +0100 | [diff] [blame] | 1672 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1673 | cmd->timer.function = null_cmd_timer_expired; |
| 1674 | } |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 1675 | cmd->rq = bd->rq; |
Alexey Dobriyan | ff770422 | 2020-02-12 23:23:20 +0300 | [diff] [blame] | 1676 | cmd->error = BLK_STS_OK; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1677 | cmd->nq = nq; |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1678 | cmd->fake_timeout = should_timeout_request(bd->rq); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1679 | |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 1680 | blk_mq_start_request(bd->rq); |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 1681 | |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 1682 | if (should_requeue_request(bd->rq)) { |
| 1683 | /* |
| 1684 | * Alternate between hitting the core BUSY path, and the |
| 1685 | * driver driven requeue path |
| 1686 | */ |
| 1687 | nq->requeue_selection++; |
| 1688 | if (nq->requeue_selection & 1) |
| 1689 | return BLK_STS_RESOURCE; |
| 1690 | else { |
| 1691 | blk_mq_requeue_request(bd->rq, true); |
| 1692 | return BLK_STS_OK; |
| 1693 | } |
| 1694 | } |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1695 | |
| 1696 | if (is_poll) { |
| 1697 | spin_lock(&nq->poll_lock); |
| 1698 | list_add_tail(&bd->rq->queuelist, &nq->poll_list); |
| 1699 | spin_unlock(&nq->poll_lock); |
| 1700 | return BLK_STS_OK; |
| 1701 | } |
Damien Le Moal | de3510e | 2021-04-01 07:52:44 +0900 | [diff] [blame] | 1702 | if (cmd->fake_timeout) |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 1703 | return BLK_STS_OK; |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 1704 | |
Chaitanya Kulkarni | d4b186e | 2019-08-22 21:45:14 -0700 | [diff] [blame] | 1705 | return null_handle_cmd(cmd, sector, nr_sectors, req_op(bd->rq)); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1706 | } |
| 1707 | |
Matias Bjørling | de65d2d | 2015-08-31 14:17:18 +0200 | [diff] [blame] | 1708 | static void cleanup_queue(struct nullb_queue *nq) |
| 1709 | { |
Christophe JAILLET | eb25ad8 | 2022-07-03 18:05:43 +0200 | [diff] [blame] | 1710 | bitmap_free(nq->tag_map); |
Matias Bjørling | de65d2d | 2015-08-31 14:17:18 +0200 | [diff] [blame] | 1711 | kfree(nq->cmds); |
| 1712 | } |
| 1713 | |
| 1714 | static void cleanup_queues(struct nullb *nullb) |
| 1715 | { |
| 1716 | int i; |
| 1717 | |
| 1718 | for (i = 0; i < nullb->nr_queues; i++) |
| 1719 | cleanup_queue(&nullb->queues[i]); |
| 1720 | |
| 1721 | kfree(nullb->queues); |
| 1722 | } |
| 1723 | |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 1724 | static void null_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
| 1725 | { |
| 1726 | struct nullb_queue *nq = hctx->driver_data; |
| 1727 | struct nullb *nullb = nq->dev->nullb; |
| 1728 | |
| 1729 | nullb->nr_queues--; |
| 1730 | } |
| 1731 | |
| 1732 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
| 1733 | { |
| 1734 | init_waitqueue_head(&nq->wait); |
| 1735 | nq->queue_depth = nullb->queue_depth; |
| 1736 | nq->dev = nullb->dev; |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1737 | INIT_LIST_HEAD(&nq->poll_list); |
| 1738 | spin_lock_init(&nq->poll_lock); |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 1739 | } |
| 1740 | |
| 1741 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, |
| 1742 | unsigned int hctx_idx) |
| 1743 | { |
| 1744 | struct nullb *nullb = hctx->queue->queuedata; |
| 1745 | struct nullb_queue *nq; |
| 1746 | |
Bart Van Assche | 596444e | 2020-03-09 21:26:23 -0700 | [diff] [blame] | 1747 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
| 1748 | if (g_init_hctx_str[0] && should_fail(&null_init_hctx_attr, 1)) |
| 1749 | return -EFAULT; |
| 1750 | #endif |
| 1751 | |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 1752 | nq = &nullb->queues[hctx_idx]; |
| 1753 | hctx->driver_data = nq; |
| 1754 | null_init_queue(nullb, nq); |
| 1755 | nullb->nr_queues++; |
| 1756 | |
| 1757 | return 0; |
| 1758 | } |
| 1759 | |
| 1760 | static const struct blk_mq_ops null_mq_ops = { |
| 1761 | .queue_rq = null_queue_rq, |
| 1762 | .complete = null_complete_rq, |
| 1763 | .timeout = null_timeout_rq, |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1764 | .poll = null_poll, |
| 1765 | .map_queues = null_map_queues, |
Bart Van Assche | 78b10be | 2020-03-09 21:26:20 -0700 | [diff] [blame] | 1766 | .init_hctx = null_init_hctx, |
| 1767 | .exit_hctx = null_exit_hctx, |
| 1768 | }; |
| 1769 | |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1770 | static void null_del_dev(struct nullb *nullb) |
| 1771 | { |
Bart Van Assche | 9b03b71 | 2020-03-09 21:26:22 -0700 | [diff] [blame] | 1772 | struct nullb_device *dev; |
| 1773 | |
| 1774 | if (!nullb) |
| 1775 | return; |
| 1776 | |
| 1777 | dev = nullb->dev; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1778 | |
Shaohua Li | 94bc02e | 2017-08-14 15:04:55 -0700 | [diff] [blame] | 1779 | ida_simple_remove(&nullb_indexes, nullb->index); |
| 1780 | |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1781 | list_del_init(&nullb->list); |
| 1782 | |
Matias Bjørling | 74ede5a | 2018-01-05 14:15:57 +0100 | [diff] [blame] | 1783 | del_gendisk(nullb->disk); |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1784 | |
| 1785 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { |
| 1786 | hrtimer_cancel(&nullb->bw_timer); |
| 1787 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); |
| 1788 | null_restart_queue_async(nullb); |
| 1789 | } |
| 1790 | |
Christoph Hellwig | 8b9ab62 | 2022-06-19 08:05:52 +0200 | [diff] [blame] | 1791 | put_disk(nullb->disk); |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1792 | if (dev->queue_mode == NULL_Q_MQ && |
| 1793 | nullb->tag_set == &nullb->__tag_set) |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 1794 | blk_mq_free_tag_set(nullb->tag_set); |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1795 | cleanup_queues(nullb); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1796 | if (null_cache_active(nullb)) |
| 1797 | null_free_device_storage(nullb->dev, true); |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1798 | kfree(nullb); |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1799 | dev->nullb = NULL; |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1800 | } |
| 1801 | |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1802 | static void null_config_discard(struct nullb *nullb) |
| 1803 | { |
| 1804 | if (nullb->dev->discard == false) |
| 1805 | return; |
Chaitanya Kulkarni | 1592cd1 | 2020-05-20 16:01:52 -0700 | [diff] [blame] | 1806 | |
Damien Le Moal | 49c7089 | 2020-11-20 10:55:16 +0900 | [diff] [blame] | 1807 | if (!nullb->dev->memory_backed) { |
| 1808 | nullb->dev->discard = false; |
| 1809 | pr_info("discard option is ignored without memory backing\n"); |
| 1810 | return; |
| 1811 | } |
| 1812 | |
Chaitanya Kulkarni | 1592cd1 | 2020-05-20 16:01:52 -0700 | [diff] [blame] | 1813 | if (nullb->dev->zoned) { |
| 1814 | nullb->dev->discard = false; |
| 1815 | pr_info("discard option is ignored in zoned mode\n"); |
| 1816 | return; |
| 1817 | } |
| 1818 | |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1819 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 1820 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); |
Matias Bjørling | b2b7e00 | 2015-11-12 20:25:10 +0100 | [diff] [blame] | 1821 | } |
| 1822 | |
Christoph Hellwig | c62b37d | 2020-07-01 10:59:43 +0200 | [diff] [blame] | 1823 | static const struct block_device_operations null_bio_ops = { |
| 1824 | .owner = THIS_MODULE, |
| 1825 | .submit_bio = null_submit_bio, |
| 1826 | .report_zones = null_report_zones, |
| 1827 | }; |
| 1828 | |
| 1829 | static const struct block_device_operations null_rq_ops = { |
Christoph Hellwig | e3f8956 | 2019-11-11 11:39:26 +0900 | [diff] [blame] | 1830 | .owner = THIS_MODULE, |
Christoph Hellwig | 7fc8fb5 | 2019-11-11 11:39:27 +0900 | [diff] [blame] | 1831 | .report_zones = null_report_zones, |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1832 | }; |
| 1833 | |
| 1834 | static int setup_commands(struct nullb_queue *nq) |
| 1835 | { |
| 1836 | struct nullb_cmd *cmd; |
Christophe JAILLET | eb25ad8 | 2022-07-03 18:05:43 +0200 | [diff] [blame] | 1837 | int i; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1838 | |
Kees Cook | 6396bb2 | 2018-06-12 14:03:40 -0700 | [diff] [blame] | 1839 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1840 | if (!nq->cmds) |
Matias Bjorling | 2d263a78 | 2013-12-18 13:41:43 +0100 | [diff] [blame] | 1841 | return -ENOMEM; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1842 | |
Christophe JAILLET | eb25ad8 | 2022-07-03 18:05:43 +0200 | [diff] [blame] | 1843 | nq->tag_map = bitmap_zalloc(nq->queue_depth, GFP_KERNEL); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1844 | if (!nq->tag_map) { |
| 1845 | kfree(nq->cmds); |
Matias Bjorling | 2d263a78 | 2013-12-18 13:41:43 +0100 | [diff] [blame] | 1846 | return -ENOMEM; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1847 | } |
| 1848 | |
| 1849 | for (i = 0; i < nq->queue_depth; i++) { |
| 1850 | cmd = &nq->cmds[i]; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1851 | cmd->tag = -1U; |
| 1852 | } |
| 1853 | |
| 1854 | return 0; |
| 1855 | } |
| 1856 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1857 | static int setup_queues(struct nullb *nullb) |
| 1858 | { |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1859 | int nqueues = nr_cpu_ids; |
| 1860 | |
| 1861 | if (g_poll_queues) |
| 1862 | nqueues += g_poll_queues; |
| 1863 | |
| 1864 | nullb->queues = kcalloc(nqueues, sizeof(struct nullb_queue), |
Kees Cook | 6396bb2 | 2018-06-12 14:03:40 -0700 | [diff] [blame] | 1865 | GFP_KERNEL); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1866 | if (!nullb->queues) |
Matias Bjorling | 2d263a78 | 2013-12-18 13:41:43 +0100 | [diff] [blame] | 1867 | return -ENOMEM; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1868 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1869 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
Matias Bjorling | 2d263a78 | 2013-12-18 13:41:43 +0100 | [diff] [blame] | 1870 | return 0; |
| 1871 | } |
| 1872 | |
| 1873 | static int init_driver_queues(struct nullb *nullb) |
| 1874 | { |
| 1875 | struct nullb_queue *nq; |
| 1876 | int i, ret = 0; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1877 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1878 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1879 | nq = &nullb->queues[i]; |
Matias Bjorling | 2d263a78 | 2013-12-18 13:41:43 +0100 | [diff] [blame] | 1880 | |
| 1881 | null_init_queue(nullb, nq); |
| 1882 | |
| 1883 | ret = setup_commands(nq); |
| 1884 | if (ret) |
Jan Kara | 31f9690 | 2014-10-22 15:34:21 +0200 | [diff] [blame] | 1885 | return ret; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1886 | nullb->nr_queues++; |
| 1887 | } |
Matias Bjorling | 2d263a78 | 2013-12-18 13:41:43 +0100 | [diff] [blame] | 1888 | return 0; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1889 | } |
| 1890 | |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1891 | static int null_gendisk_register(struct nullb *nullb) |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 1892 | { |
Christoph Hellwig | 979d544 | 2019-12-03 10:39:02 +0100 | [diff] [blame] | 1893 | sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT; |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 1894 | struct gendisk *disk = nullb->disk; |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1895 | |
Christoph Hellwig | 979d544 | 2019-12-03 10:39:02 +0100 | [diff] [blame] | 1896 | set_capacity(disk, size); |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1897 | |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1898 | disk->major = null_major; |
| 1899 | disk->first_minor = nullb->index; |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 1900 | disk->minors = 1; |
Christoph Hellwig | c62b37d | 2020-07-01 10:59:43 +0200 | [diff] [blame] | 1901 | if (queue_is_mq(nullb->q)) |
| 1902 | disk->fops = &null_rq_ops; |
| 1903 | else |
| 1904 | disk->fops = &null_bio_ops; |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1905 | disk->private_data = nullb; |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1906 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); |
| 1907 | |
Damien Le Moal | bf50545 | 2018-10-12 19:08:50 +0900 | [diff] [blame] | 1908 | if (nullb->dev->zoned) { |
Damien Le Moal | d205bde | 2020-04-23 12:02:38 +0900 | [diff] [blame] | 1909 | int ret = null_register_zoned_dev(nullb); |
| 1910 | |
| 1911 | if (ret) |
| 1912 | return ret; |
Damien Le Moal | bf50545 | 2018-10-12 19:08:50 +0900 | [diff] [blame] | 1913 | } |
| 1914 | |
Luis Chamberlain | 10e7123 | 2021-08-18 16:45:42 +0200 | [diff] [blame] | 1915 | return add_disk(disk); |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 1916 | } |
| 1917 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 1918 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 1919 | { |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 1920 | unsigned int flags = BLK_MQ_F_SHOULD_MERGE; |
| 1921 | int hw_queues, numa_node; |
| 1922 | unsigned int queue_depth; |
Jens Axboe | 0a593fb | 2021-04-17 09:29:49 -0600 | [diff] [blame] | 1923 | int poll_queues; |
| 1924 | |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 1925 | if (nullb) { |
| 1926 | hw_queues = nullb->dev->submit_queues; |
| 1927 | poll_queues = nullb->dev->poll_queues; |
| 1928 | queue_depth = nullb->dev->hw_queue_depth; |
| 1929 | numa_node = nullb->dev->home_node; |
| 1930 | if (nullb->dev->no_sched) |
| 1931 | flags |= BLK_MQ_F_NO_SCHED; |
| 1932 | if (nullb->dev->shared_tag_bitmap) |
| 1933 | flags |= BLK_MQ_F_TAG_HCTX_SHARED; |
| 1934 | if (nullb->dev->blocking) |
| 1935 | flags |= BLK_MQ_F_BLOCKING; |
| 1936 | } else { |
| 1937 | hw_queues = g_submit_queues; |
| 1938 | poll_queues = g_poll_queues; |
| 1939 | queue_depth = g_hw_queue_depth; |
| 1940 | numa_node = g_home_node; |
| 1941 | if (g_no_sched) |
| 1942 | flags |= BLK_MQ_F_NO_SCHED; |
| 1943 | if (g_shared_tag_bitmap) |
| 1944 | flags |= BLK_MQ_F_TAG_HCTX_SHARED; |
| 1945 | if (g_blocking) |
| 1946 | flags |= BLK_MQ_F_BLOCKING; |
| 1947 | } |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 1948 | |
Vincent Fu | 7012eef | 2022-07-08 17:49:49 +0000 | [diff] [blame] | 1949 | set->ops = &null_mq_ops; |
| 1950 | set->cmd_size = sizeof(struct nullb_cmd); |
| 1951 | set->flags = flags; |
| 1952 | set->driver_data = nullb; |
| 1953 | set->nr_hw_queues = hw_queues; |
| 1954 | set->queue_depth = queue_depth; |
| 1955 | set->numa_node = numa_node; |
| 1956 | if (poll_queues) { |
| 1957 | set->nr_hw_queues += poll_queues; |
| 1958 | set->nr_maps = 3; |
| 1959 | } else { |
| 1960 | set->nr_maps = 1; |
| 1961 | } |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 1962 | |
| 1963 | return blk_mq_alloc_tag_set(set); |
| 1964 | } |
| 1965 | |
Damien Le Moal | 5c4bd1f | 2019-12-03 10:39:01 +0100 | [diff] [blame] | 1966 | static int null_validate_conf(struct nullb_device *dev) |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 1967 | { |
| 1968 | dev->blocksize = round_down(dev->blocksize, 512); |
| 1969 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 1970 | |
| 1971 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { |
| 1972 | if (dev->submit_queues != nr_online_nodes) |
| 1973 | dev->submit_queues = nr_online_nodes; |
| 1974 | } else if (dev->submit_queues > nr_cpu_ids) |
| 1975 | dev->submit_queues = nr_cpu_ids; |
| 1976 | else if (dev->submit_queues == 0) |
| 1977 | dev->submit_queues = 1; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 1978 | dev->prev_submit_queues = dev->submit_queues; |
| 1979 | |
| 1980 | if (dev->poll_queues > g_poll_queues) |
| 1981 | dev->poll_queues = g_poll_queues; |
Shin'ichiro Kawasaki | 15dfc66 | 2021-10-29 19:39:26 +0900 | [diff] [blame] | 1982 | dev->prev_poll_queues = dev->poll_queues; |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 1983 | |
| 1984 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); |
| 1985 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); |
Shaohua Li | 5bcd0e0 | 2017-08-14 15:04:56 -0700 | [diff] [blame] | 1986 | |
| 1987 | /* Do memory allocation, so set blocking */ |
| 1988 | if (dev->memory_backed) |
| 1989 | dev->blocking = true; |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 1990 | else /* cache is meaningless */ |
| 1991 | dev->cache_size = 0; |
| 1992 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, |
| 1993 | dev->cache_size); |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 1994 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
| 1995 | /* can not stop a queue */ |
| 1996 | if (dev->queue_mode == NULL_Q_BIO) |
| 1997 | dev->mbps = 0; |
Damien Le Moal | 5c4bd1f | 2019-12-03 10:39:01 +0100 | [diff] [blame] | 1998 | |
| 1999 | if (dev->zoned && |
| 2000 | (!dev->zone_size || !is_power_of_2(dev->zone_size))) { |
| 2001 | pr_err("zone_size must be power-of-two\n"); |
| 2002 | return -EINVAL; |
| 2003 | } |
| 2004 | |
| 2005 | return 0; |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 2006 | } |
| 2007 | |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 2008 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
| 2009 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
| 2010 | { |
| 2011 | if (!str[0]) |
| 2012 | return true; |
| 2013 | |
| 2014 | if (!setup_fault_attr(attr, str)) |
| 2015 | return false; |
| 2016 | |
| 2017 | attr->verbose = 0; |
| 2018 | return true; |
| 2019 | } |
| 2020 | #endif |
| 2021 | |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 2022 | static bool null_setup_fault(void) |
| 2023 | { |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 2024 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 2025 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 2026 | return false; |
Jens Axboe | 24941b90 | 2018-02-28 09:18:57 -0700 | [diff] [blame] | 2027 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) |
| 2028 | return false; |
Bart Van Assche | 596444e | 2020-03-09 21:26:23 -0700 | [diff] [blame] | 2029 | if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str)) |
| 2030 | return false; |
Arnd Bergmann | 33f782c | 2018-01-11 11:31:25 +0100 | [diff] [blame] | 2031 | #endif |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 2032 | return true; |
| 2033 | } |
| 2034 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2035 | static int null_add_dev(struct nullb_device *dev) |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 2036 | { |
| 2037 | struct nullb *nullb; |
Robert Elliott | dc501dc | 2014-09-02 11:38:49 -0500 | [diff] [blame] | 2038 | int rv; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2039 | |
Damien Le Moal | 5c4bd1f | 2019-12-03 10:39:01 +0100 | [diff] [blame] | 2040 | rv = null_validate_conf(dev); |
| 2041 | if (rv) |
| 2042 | return rv; |
Shaohua Li | cedcafa | 2017-08-14 15:04:54 -0700 | [diff] [blame] | 2043 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2044 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
Robert Elliott | dc501dc | 2014-09-02 11:38:49 -0500 | [diff] [blame] | 2045 | if (!nullb) { |
| 2046 | rv = -ENOMEM; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2047 | goto out; |
Robert Elliott | dc501dc | 2014-09-02 11:38:49 -0500 | [diff] [blame] | 2048 | } |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2049 | nullb->dev = dev; |
| 2050 | dev->nullb = nullb; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2051 | |
| 2052 | spin_lock_init(&nullb->lock); |
| 2053 | |
Robert Elliott | dc501dc | 2014-09-02 11:38:49 -0500 | [diff] [blame] | 2054 | rv = setup_queues(nullb); |
| 2055 | if (rv) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2056 | goto out_free_nullb; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2057 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2058 | if (dev->queue_mode == NULL_Q_MQ) { |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 2059 | if (shared_tags) { |
| 2060 | nullb->tag_set = &tag_set; |
| 2061 | rv = 0; |
| 2062 | } else { |
| 2063 | nullb->tag_set = &nullb->__tag_set; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2064 | rv = null_init_tag_set(nullb, nullb->tag_set); |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 2065 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2066 | |
Robert Elliott | dc501dc | 2014-09-02 11:38:49 -0500 | [diff] [blame] | 2067 | if (rv) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2068 | goto out_cleanup_queues; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2069 | |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 2070 | if (!null_setup_fault()) |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 2071 | goto out_cleanup_tags; |
Jens Axboe | 93b5704 | 2018-01-10 09:06:23 -0700 | [diff] [blame] | 2072 | |
Jens Axboe | 5448aca | 2018-01-09 12:47:24 -0700 | [diff] [blame] | 2073 | nullb->tag_set->timeout = 5 * HZ; |
Christoph Hellwig | 6759b1a | 2021-06-02 09:53:35 +0300 | [diff] [blame] | 2074 | nullb->disk = blk_mq_alloc_disk(nullb->tag_set, nullb); |
| 2075 | if (IS_ERR(nullb->disk)) { |
| 2076 | rv = PTR_ERR(nullb->disk); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2077 | goto out_cleanup_tags; |
Christoph Hellwig | 6759b1a | 2021-06-02 09:53:35 +0300 | [diff] [blame] | 2078 | } |
| 2079 | nullb->q = nullb->disk->queue; |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2080 | } else if (dev->queue_mode == NULL_Q_BIO) { |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 2081 | rv = -ENOMEM; |
| 2082 | nullb->disk = blk_alloc_disk(nullb->dev->home_node); |
| 2083 | if (!nullb->disk) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2084 | goto out_cleanup_queues; |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 2085 | |
| 2086 | nullb->q = nullb->disk->queue; |
Jan Kara | 31f9690 | 2014-10-22 15:34:21 +0200 | [diff] [blame] | 2087 | rv = init_driver_queues(nullb); |
| 2088 | if (rv) |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 2089 | goto out_cleanup_disk; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2090 | } |
| 2091 | |
Shaohua Li | eff2c4f | 2017-08-14 15:04:58 -0700 | [diff] [blame] | 2092 | if (dev->mbps) { |
| 2093 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); |
| 2094 | nullb_setup_bwtimer(nullb); |
| 2095 | } |
| 2096 | |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 2097 | if (dev->cache_size > 0) { |
| 2098 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); |
| 2099 | blk_queue_write_cache(nullb->q, true, true); |
Shaohua Li | deb78b4 | 2017-08-14 15:04:59 -0700 | [diff] [blame] | 2100 | } |
| 2101 | |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 2102 | if (dev->zoned) { |
Damien Le Moal | d205bde | 2020-04-23 12:02:38 +0900 | [diff] [blame] | 2103 | rv = null_init_zoned_dev(dev, nullb->q); |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 2104 | if (rv) |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 2105 | goto out_cleanup_disk; |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 2106 | } |
| 2107 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2108 | nullb->q->queuedata = nullb; |
Bart Van Assche | 8b904b5 | 2018-03-07 17:10:10 -0800 | [diff] [blame] | 2109 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
| 2110 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2111 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2112 | mutex_lock(&lock); |
Dan Carpenter | ee452a8 | 2022-07-15 11:12:14 +0300 | [diff] [blame] | 2113 | rv = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
| 2114 | if (rv < 0) { |
| 2115 | mutex_unlock(&lock); |
| 2116 | goto out_cleanup_zone; |
| 2117 | } |
| 2118 | nullb->index = rv; |
| 2119 | dev->index = rv; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2120 | mutex_unlock(&lock); |
| 2121 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2122 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
| 2123 | blk_queue_physical_block_size(nullb->q, dev->blocksize); |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 2124 | if (!dev->max_sectors) |
| 2125 | dev->max_sectors = queue_max_hw_sectors(nullb->q); |
Keith Busch | 0a26f32 | 2023-01-05 12:51:45 -0800 | [diff] [blame] | 2126 | dev->max_sectors = min(dev->max_sectors, BLK_DEF_MAX_SECTORS); |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 2127 | blk_queue_max_hw_sectors(nullb->q, dev->max_sectors); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2128 | |
Max Gurtovoy | cee1b21 | 2021-04-12 09:55:23 +0000 | [diff] [blame] | 2129 | if (dev->virt_boundary) |
| 2130 | blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1); |
| 2131 | |
Shaohua Li | 306eb6b | 2017-08-14 15:04:57 -0700 | [diff] [blame] | 2132 | null_config_discard(nullb); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2133 | |
Damien Le Moal | 49c3b92 | 2022-04-20 09:57:18 +0900 | [diff] [blame] | 2134 | if (config_item_name(&dev->item)) { |
| 2135 | /* Use configfs dir name as the device name */ |
| 2136 | snprintf(nullb->disk_name, sizeof(nullb->disk_name), |
| 2137 | "%s", config_item_name(&dev->item)); |
| 2138 | } else { |
| 2139 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
| 2140 | } |
Matias Bjørling | b2b7e00 | 2015-11-12 20:25:10 +0100 | [diff] [blame] | 2141 | |
Matias Bjørling | 74ede5a | 2018-01-05 14:15:57 +0100 | [diff] [blame] | 2142 | rv = null_gendisk_register(nullb); |
Matias Bjørling | 9ae2d0a | 2016-09-16 14:25:05 +0200 | [diff] [blame] | 2143 | if (rv) |
Dan Carpenter | ee452a8 | 2022-07-15 11:12:14 +0300 | [diff] [blame] | 2144 | goto out_ida_free; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2145 | |
Matias Bjørling | a514379 | 2016-02-11 14:49:13 +0100 | [diff] [blame] | 2146 | mutex_lock(&lock); |
| 2147 | list_add_tail(&nullb->list, &nullb_list); |
| 2148 | mutex_unlock(&lock); |
Wenwei Tao | 3681c85d | 2016-03-05 00:27:04 +0800 | [diff] [blame] | 2149 | |
Damien Le Moal | db060f5 | 2022-04-20 09:57:17 +0900 | [diff] [blame] | 2150 | pr_info("disk %s created\n", nullb->disk_name); |
| 2151 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2152 | return 0; |
Dan Carpenter | ee452a8 | 2022-07-15 11:12:14 +0300 | [diff] [blame] | 2153 | |
| 2154 | out_ida_free: |
| 2155 | ida_free(&nullb_indexes, nullb->index); |
Matias Bjørling | ca4b2a0 | 2018-07-06 19:38:39 +0200 | [diff] [blame] | 2156 | out_cleanup_zone: |
Damien Le Moal | d205bde | 2020-04-23 12:02:38 +0900 | [diff] [blame] | 2157 | null_free_zoned_dev(dev); |
Christoph Hellwig | 132226b | 2021-05-21 07:51:15 +0200 | [diff] [blame] | 2158 | out_cleanup_disk: |
Christoph Hellwig | 8b9ab62 | 2022-06-19 08:05:52 +0200 | [diff] [blame] | 2159 | put_disk(nullb->disk); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2160 | out_cleanup_tags: |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2161 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 2162 | blk_mq_free_tag_set(nullb->tag_set); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2163 | out_cleanup_queues: |
| 2164 | cleanup_queues(nullb); |
| 2165 | out_free_nullb: |
| 2166 | kfree(nullb); |
Bart Van Assche | 2004bfd | 2020-03-09 21:26:21 -0700 | [diff] [blame] | 2167 | dev->nullb = NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2168 | out: |
Robert Elliott | dc501dc | 2014-09-02 11:38:49 -0500 | [diff] [blame] | 2169 | return rv; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2170 | } |
| 2171 | |
Damien Le Moal | 49c3b92 | 2022-04-20 09:57:18 +0900 | [diff] [blame] | 2172 | static struct nullb *null_find_dev_by_name(const char *name) |
| 2173 | { |
| 2174 | struct nullb *nullb = NULL, *nb; |
| 2175 | |
| 2176 | mutex_lock(&lock); |
| 2177 | list_for_each_entry(nb, &nullb_list, list) { |
| 2178 | if (strcmp(nb->disk_name, name) == 0) { |
| 2179 | nullb = nb; |
| 2180 | break; |
| 2181 | } |
| 2182 | } |
| 2183 | mutex_unlock(&lock); |
| 2184 | |
| 2185 | return nullb; |
| 2186 | } |
| 2187 | |
Damien Le Moal | b3a0a73 | 2022-04-20 09:57:16 +0900 | [diff] [blame] | 2188 | static int null_create_dev(void) |
| 2189 | { |
| 2190 | struct nullb_device *dev; |
| 2191 | int ret; |
| 2192 | |
| 2193 | dev = null_alloc_dev(); |
| 2194 | if (!dev) |
| 2195 | return -ENOMEM; |
| 2196 | |
| 2197 | ret = null_add_dev(dev); |
| 2198 | if (ret) { |
| 2199 | null_free_dev(dev); |
| 2200 | return ret; |
| 2201 | } |
| 2202 | |
| 2203 | return 0; |
| 2204 | } |
| 2205 | |
| 2206 | static void null_destroy_dev(struct nullb *nullb) |
| 2207 | { |
| 2208 | struct nullb_device *dev = nullb->dev; |
| 2209 | |
| 2210 | null_del_dev(nullb); |
| 2211 | null_free_dev(dev); |
| 2212 | } |
| 2213 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2214 | static int __init null_init(void) |
| 2215 | { |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2216 | int ret = 0; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2217 | unsigned int i; |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2218 | struct nullb *nullb; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2219 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2220 | if (g_bs > PAGE_SIZE) { |
André Almeida | 9c7eddf | 2019-09-16 11:07:59 -0300 | [diff] [blame] | 2221 | pr_warn("invalid block size\n"); |
| 2222 | pr_warn("defaults block size to %lu\n", PAGE_SIZE); |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2223 | g_bs = PAGE_SIZE; |
Raghavendra K T | 9967d8a | 2014-01-21 16:59:59 +0530 | [diff] [blame] | 2224 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2225 | |
Damien Le Moal | ea17fd3 | 2020-11-20 10:55:18 +0900 | [diff] [blame] | 2226 | if (g_max_sectors > BLK_DEF_MAX_SECTORS) { |
| 2227 | pr_warn("invalid max sectors\n"); |
| 2228 | pr_warn("defaults max sectors to %u\n", BLK_DEF_MAX_SECTORS); |
| 2229 | g_max_sectors = BLK_DEF_MAX_SECTORS; |
| 2230 | } |
| 2231 | |
John Pittman | 7ff684a | 2019-04-05 17:42:45 -0400 | [diff] [blame] | 2232 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
André Almeida | 9c7eddf | 2019-09-16 11:07:59 -0300 | [diff] [blame] | 2233 | pr_err("invalid home_node value\n"); |
John Pittman | 7ff684a | 2019-04-05 17:42:45 -0400 | [diff] [blame] | 2234 | g_home_node = NUMA_NO_NODE; |
| 2235 | } |
| 2236 | |
Jens Axboe | e50b1e3 | 2018-10-11 17:58:17 -0600 | [diff] [blame] | 2237 | if (g_queue_mode == NULL_Q_RQ) { |
Damien Le Moal | 525323d | 2022-04-20 09:57:15 +0900 | [diff] [blame] | 2238 | pr_err("legacy IO path is no longer available\n"); |
Jens Axboe | e50b1e3 | 2018-10-11 17:58:17 -0600 | [diff] [blame] | 2239 | return -EINVAL; |
| 2240 | } |
Damien Le Moal | 525323d | 2022-04-20 09:57:15 +0900 | [diff] [blame] | 2241 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2242 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
| 2243 | if (g_submit_queues != nr_online_nodes) { |
André Almeida | 9c7eddf | 2019-09-16 11:07:59 -0300 | [diff] [blame] | 2244 | pr_warn("submit_queues param is set to %u.\n", |
Damien Le Moal | 525323d | 2022-04-20 09:57:15 +0900 | [diff] [blame] | 2245 | nr_online_nodes); |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2246 | g_submit_queues = nr_online_nodes; |
Matias Bjørling | fc1bc35 | 2013-12-21 00:11:01 +0100 | [diff] [blame] | 2247 | } |
Damien Le Moal | 525323d | 2022-04-20 09:57:15 +0900 | [diff] [blame] | 2248 | } else if (g_submit_queues > nr_cpu_ids) { |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2249 | g_submit_queues = nr_cpu_ids; |
Damien Le Moal | 525323d | 2022-04-20 09:57:15 +0900 | [diff] [blame] | 2250 | } else if (g_submit_queues <= 0) { |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2251 | g_submit_queues = 1; |
Damien Le Moal | 525323d | 2022-04-20 09:57:15 +0900 | [diff] [blame] | 2252 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2253 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2254 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
| 2255 | ret = null_init_tag_set(NULL, &tag_set); |
Max Gurtovoy | db2d153 | 2017-07-06 18:00:07 +0300 | [diff] [blame] | 2256 | if (ret) |
| 2257 | return ret; |
| 2258 | } |
| 2259 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 2260 | config_group_init(&nullb_subsys.su_group); |
| 2261 | mutex_init(&nullb_subsys.su_mutex); |
| 2262 | |
| 2263 | ret = configfs_register_subsystem(&nullb_subsys); |
| 2264 | if (ret) |
| 2265 | goto err_tagset; |
| 2266 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2267 | mutex_init(&lock); |
| 2268 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2269 | null_major = register_blkdev(0, "nullb"); |
Max Gurtovoy | db2d153 | 2017-07-06 18:00:07 +0300 | [diff] [blame] | 2270 | if (null_major < 0) { |
| 2271 | ret = null_major; |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 2272 | goto err_conf; |
Max Gurtovoy | db2d153 | 2017-07-06 18:00:07 +0300 | [diff] [blame] | 2273 | } |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2274 | |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2275 | for (i = 0; i < nr_devices; i++) { |
Damien Le Moal | b3a0a73 | 2022-04-20 09:57:16 +0900 | [diff] [blame] | 2276 | ret = null_create_dev(); |
| 2277 | if (ret) |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2278 | goto err_dev; |
| 2279 | } |
| 2280 | |
André Almeida | 9c7eddf | 2019-09-16 11:07:59 -0300 | [diff] [blame] | 2281 | pr_info("module loaded\n"); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2282 | return 0; |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2283 | |
| 2284 | err_dev: |
| 2285 | while (!list_empty(&nullb_list)) { |
| 2286 | nullb = list_entry(nullb_list.next, struct nullb, list); |
Damien Le Moal | b3a0a73 | 2022-04-20 09:57:16 +0900 | [diff] [blame] | 2287 | null_destroy_dev(nullb); |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2288 | } |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2289 | unregister_blkdev(null_major, "nullb"); |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 2290 | err_conf: |
| 2291 | configfs_unregister_subsystem(&nullb_subsys); |
Max Gurtovoy | db2d153 | 2017-07-06 18:00:07 +0300 | [diff] [blame] | 2292 | err_tagset: |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2293 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
Max Gurtovoy | db2d153 | 2017-07-06 18:00:07 +0300 | [diff] [blame] | 2294 | blk_mq_free_tag_set(&tag_set); |
Minfei Huang | af096e2 | 2015-12-08 13:47:34 -0700 | [diff] [blame] | 2295 | return ret; |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2296 | } |
| 2297 | |
| 2298 | static void __exit null_exit(void) |
| 2299 | { |
| 2300 | struct nullb *nullb; |
| 2301 | |
Shaohua Li | 3bf2bd2 | 2017-08-14 15:04:53 -0700 | [diff] [blame] | 2302 | configfs_unregister_subsystem(&nullb_subsys); |
| 2303 | |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2304 | unregister_blkdev(null_major, "nullb"); |
| 2305 | |
| 2306 | mutex_lock(&lock); |
| 2307 | while (!list_empty(&nullb_list)) { |
| 2308 | nullb = list_entry(nullb_list.next, struct nullb, list); |
Damien Le Moal | b3a0a73 | 2022-04-20 09:57:16 +0900 | [diff] [blame] | 2309 | null_destroy_dev(nullb); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2310 | } |
| 2311 | mutex_unlock(&lock); |
Matias Bjørling | 6bb9535 | 2015-11-19 12:50:08 +0100 | [diff] [blame] | 2312 | |
Shaohua Li | 2984c86 | 2017-08-14 15:04:52 -0700 | [diff] [blame] | 2313 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
Jens Axboe | 82f402f | 2017-06-20 14:22:01 -0600 | [diff] [blame] | 2314 | blk_mq_free_tag_set(&tag_set); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2315 | } |
| 2316 | |
| 2317 | module_init(null_init); |
| 2318 | module_exit(null_exit); |
| 2319 | |
Jens Axboe | 231b3db | 2017-08-25 12:53:15 -0600 | [diff] [blame] | 2320 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
Jens Axboe | f2298c0 | 2013-10-25 11:52:25 +0100 | [diff] [blame] | 2321 | MODULE_LICENSE("GPL"); |