| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2013 Shaohua Li <shli@kernel.org> |
| * Copyright (C) 2014 Red Hat, Inc. |
| * Copyright (C) 2015 Arrikto, Inc. |
| * Copyright (C) 2017 Chinamobile, Inc. |
| */ |
| |
| #include <linux/spinlock.h> |
| #include <linux/module.h> |
| #include <linux/idr.h> |
| #include <linux/kernel.h> |
| #include <linux/timer.h> |
| #include <linux/parser.h> |
| #include <linux/vmalloc.h> |
| #include <linux/uio_driver.h> |
| #include <linux/radix-tree.h> |
| #include <linux/stringify.h> |
| #include <linux/bitops.h> |
| #include <linux/highmem.h> |
| #include <linux/configfs.h> |
| #include <linux/mutex.h> |
| #include <linux/workqueue.h> |
| #include <net/genetlink.h> |
| #include <scsi/scsi_common.h> |
| #include <scsi/scsi_proto.h> |
| #include <target/target_core_base.h> |
| #include <target/target_core_fabric.h> |
| #include <target/target_core_backend.h> |
| |
| #include <linux/target_core_user.h> |
| |
| /** |
| * DOC: Userspace I/O |
| * Userspace I/O |
| * ------------- |
| * |
| * Define a shared-memory interface for LIO to pass SCSI commands and |
| * data to userspace for processing. This is to allow backends that |
| * are too complex for in-kernel support to be possible. |
| * |
| * It uses the UIO framework to do a lot of the device-creation and |
| * introspection work for us. |
| * |
| * See the .h file for how the ring is laid out. Note that while the |
| * command ring is defined, the particulars of the data area are |
| * not. Offset values in the command entry point to other locations |
| * internal to the mmap-ed area. There is separate space outside the |
| * command ring for data buffers. This leaves maximum flexibility for |
| * moving buffer allocations, or even page flipping or other |
| * allocation techniques, without altering the command ring layout. |
| * |
| * SECURITY: |
| * The user process must be assumed to be malicious. There's no way to |
| * prevent it breaking the command ring protocol if it wants, but in |
| * order to prevent other issues we must only ever read *data* from |
| * the shared memory area, not offsets or sizes. This applies to |
| * command ring entries as well as the mailbox. Extra code needed for |
| * this may have a 'UAM' comment. |
| */ |
| |
| #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) |
| |
| /* For cmd area, the size is fixed 8MB */ |
| #define CMDR_SIZE (8 * 1024 * 1024) |
| |
| /* |
| * For data area, the block size is PAGE_SIZE and |
| * the total size is 256K * PAGE_SIZE. |
| */ |
| #define DATA_BLOCK_SIZE PAGE_SIZE |
| #define DATA_BLOCK_SHIFT PAGE_SHIFT |
| #define DATA_BLOCK_BITS_DEF (256 * 1024) |
| |
| #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) |
| #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) |
| |
| /* |
| * Default number of global data blocks(512K * PAGE_SIZE) |
| * when the unmap thread will be started. |
| */ |
| #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) |
| |
| static u8 tcmu_kern_cmd_reply_supported; |
| static u8 tcmu_netlink_blocked; |
| |
| static struct device *tcmu_root_device; |
| |
| struct tcmu_hba { |
| u32 host_id; |
| }; |
| |
| #define TCMU_CONFIG_LEN 256 |
| |
| static DEFINE_MUTEX(tcmu_nl_cmd_mutex); |
| static LIST_HEAD(tcmu_nl_cmd_list); |
| |
| struct tcmu_dev; |
| |
| struct tcmu_nl_cmd { |
| /* wake up thread waiting for reply */ |
| struct completion complete; |
| struct list_head nl_list; |
| struct tcmu_dev *udev; |
| int cmd; |
| int status; |
| }; |
| |
| struct tcmu_dev { |
| struct list_head node; |
| struct kref kref; |
| |
| struct se_device se_dev; |
| |
| char *name; |
| struct se_hba *hba; |
| |
| #define TCMU_DEV_BIT_OPEN 0 |
| #define TCMU_DEV_BIT_BROKEN 1 |
| #define TCMU_DEV_BIT_BLOCKED 2 |
| #define TCMU_DEV_BIT_TMR_NOTIFY 3 |
| unsigned long flags; |
| |
| struct uio_info uio_info; |
| |
| struct inode *inode; |
| |
| struct tcmu_mailbox *mb_addr; |
| uint64_t dev_size; |
| u32 cmdr_size; |
| u32 cmdr_last_cleaned; |
| /* Offset of data area from start of mb */ |
| /* Must add data_off and mb_addr to get the address */ |
| size_t data_off; |
| size_t data_size; |
| uint32_t max_blocks; |
| size_t ring_size; |
| |
| struct mutex cmdr_lock; |
| struct list_head qfull_queue; |
| struct list_head tmr_queue; |
| |
| uint32_t dbi_max; |
| uint32_t dbi_thresh; |
| unsigned long *data_bitmap; |
| struct radix_tree_root data_blocks; |
| |
| struct idr commands; |
| |
| struct timer_list cmd_timer; |
| unsigned int cmd_time_out; |
| struct list_head inflight_queue; |
| |
| struct timer_list qfull_timer; |
| int qfull_time_out; |
| |
| struct list_head timedout_entry; |
| |
| struct tcmu_nl_cmd curr_nl_cmd; |
| |
| char dev_config[TCMU_CONFIG_LEN]; |
| |
| int nl_reply_supported; |
| }; |
| |
| #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) |
| |
| #define CMDR_OFF sizeof(struct tcmu_mailbox) |
| |
| struct tcmu_cmd { |
| struct se_cmd *se_cmd; |
| struct tcmu_dev *tcmu_dev; |
| struct list_head queue_entry; |
| |
| uint16_t cmd_id; |
| |
| /* Can't use se_cmd when cleaning up expired cmds, because if |
| cmd has been completed then accessing se_cmd is off limits */ |
| uint32_t dbi_cnt; |
| uint32_t dbi_bidi_cnt; |
| uint32_t dbi_cur; |
| uint32_t *dbi; |
| |
| uint32_t data_len_bidi; |
| |
| unsigned long deadline; |
| |
| #define TCMU_CMD_BIT_EXPIRED 0 |
| unsigned long flags; |
| }; |
| |
| struct tcmu_tmr { |
| struct list_head queue_entry; |
| |
| uint8_t tmr_type; |
| uint32_t tmr_cmd_cnt; |
| int16_t tmr_cmd_ids[]; |
| }; |
| |
| /* |
| * To avoid dead lock the mutex lock order should always be: |
| * |
| * mutex_lock(&root_udev_mutex); |
| * ... |
| * mutex_lock(&tcmu_dev->cmdr_lock); |
| * mutex_unlock(&tcmu_dev->cmdr_lock); |
| * ... |
| * mutex_unlock(&root_udev_mutex); |
| */ |
| static DEFINE_MUTEX(root_udev_mutex); |
| static LIST_HEAD(root_udev); |
| |
| static DEFINE_SPINLOCK(timed_out_udevs_lock); |
| static LIST_HEAD(timed_out_udevs); |
| |
| static struct kmem_cache *tcmu_cmd_cache; |
| |
| static atomic_t global_db_count = ATOMIC_INIT(0); |
| static struct delayed_work tcmu_unmap_work; |
| static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; |
| |
| static int tcmu_set_global_max_data_area(const char *str, |
| const struct kernel_param *kp) |
| { |
| int ret, max_area_mb; |
| |
| ret = kstrtoint(str, 10, &max_area_mb); |
| if (ret) |
| return -EINVAL; |
| |
| if (max_area_mb <= 0) { |
| pr_err("global_max_data_area must be larger than 0.\n"); |
| return -EINVAL; |
| } |
| |
| tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); |
| if (atomic_read(&global_db_count) > tcmu_global_max_blocks) |
| schedule_delayed_work(&tcmu_unmap_work, 0); |
| else |
| cancel_delayed_work_sync(&tcmu_unmap_work); |
| |
| return 0; |
| } |
| |
| static int tcmu_get_global_max_data_area(char *buffer, |
| const struct kernel_param *kp) |
| { |
| return sprintf(buffer, "%d\n", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); |
| } |
| |
| static const struct kernel_param_ops tcmu_global_max_data_area_op = { |
| .set = tcmu_set_global_max_data_area, |
| .get = tcmu_get_global_max_data_area, |
| }; |
| |
| module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, |
| S_IWUSR | S_IRUGO); |
| MODULE_PARM_DESC(global_max_data_area_mb, |
| "Max MBs allowed to be allocated to all the tcmu device's " |
| "data areas."); |
| |
| static int tcmu_get_block_netlink(char *buffer, |
| const struct kernel_param *kp) |
| { |
| return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? |
| "blocked" : "unblocked"); |
| } |
| |
| static int tcmu_set_block_netlink(const char *str, |
| const struct kernel_param *kp) |
| { |
| int ret; |
| u8 val; |
| |
| ret = kstrtou8(str, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| if (val > 1) { |
| pr_err("Invalid block netlink value %u\n", val); |
| return -EINVAL; |
| } |
| |
| tcmu_netlink_blocked = val; |
| return 0; |
| } |
| |
| static const struct kernel_param_ops tcmu_block_netlink_op = { |
| .set = tcmu_set_block_netlink, |
| .get = tcmu_get_block_netlink, |
| }; |
| |
| module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); |
| MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); |
| |
| static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) |
| { |
| struct tcmu_dev *udev = nl_cmd->udev; |
| |
| if (!tcmu_netlink_blocked) { |
| pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); |
| return -EBUSY; |
| } |
| |
| if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { |
| pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); |
| nl_cmd->status = -EINTR; |
| list_del(&nl_cmd->nl_list); |
| complete(&nl_cmd->complete); |
| } |
| return 0; |
| } |
| |
| static int tcmu_set_reset_netlink(const char *str, |
| const struct kernel_param *kp) |
| { |
| struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; |
| int ret; |
| u8 val; |
| |
| ret = kstrtou8(str, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| if (val != 1) { |
| pr_err("Invalid reset netlink value %u\n", val); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&tcmu_nl_cmd_mutex); |
| list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { |
| ret = tcmu_fail_netlink_cmd(nl_cmd); |
| if (ret) |
| break; |
| } |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| |
| return ret; |
| } |
| |
| static const struct kernel_param_ops tcmu_reset_netlink_op = { |
| .set = tcmu_set_reset_netlink, |
| }; |
| |
| module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); |
| MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); |
| |
| /* multicast group */ |
| enum tcmu_multicast_groups { |
| TCMU_MCGRP_CONFIG, |
| }; |
| |
| static const struct genl_multicast_group tcmu_mcgrps[] = { |
| [TCMU_MCGRP_CONFIG] = { .name = "config", }, |
| }; |
| |
| static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
| [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, |
| [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, |
| [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, |
| [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, |
| [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, |
| }; |
| |
| static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) |
| { |
| struct tcmu_dev *udev = NULL; |
| struct tcmu_nl_cmd *nl_cmd; |
| int dev_id, rc, ret = 0; |
| |
| if (!info->attrs[TCMU_ATTR_CMD_STATUS] || |
| !info->attrs[TCMU_ATTR_DEVICE_ID]) { |
| printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); |
| return -EINVAL; |
| } |
| |
| dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); |
| rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); |
| |
| mutex_lock(&tcmu_nl_cmd_mutex); |
| list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { |
| if (nl_cmd->udev->se_dev.dev_index == dev_id) { |
| udev = nl_cmd->udev; |
| break; |
| } |
| } |
| |
| if (!udev) { |
| pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", |
| completed_cmd, rc, dev_id); |
| ret = -ENODEV; |
| goto unlock; |
| } |
| list_del(&nl_cmd->nl_list); |
| |
| pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", |
| udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, |
| nl_cmd->status); |
| |
| if (nl_cmd->cmd != completed_cmd) { |
| pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", |
| udev->name, completed_cmd, nl_cmd->cmd); |
| ret = -EINVAL; |
| goto unlock; |
| } |
| |
| nl_cmd->status = rc; |
| complete(&nl_cmd->complete); |
| unlock: |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| return ret; |
| } |
| |
| static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) |
| { |
| return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); |
| } |
| |
| static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) |
| { |
| return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); |
| } |
| |
| static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, |
| struct genl_info *info) |
| { |
| return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); |
| } |
| |
| static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) |
| { |
| if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { |
| tcmu_kern_cmd_reply_supported = |
| nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); |
| printk(KERN_INFO "tcmu daemon: command reply support %u.\n", |
| tcmu_kern_cmd_reply_supported); |
| } |
| |
| return 0; |
| } |
| |
| static const struct genl_small_ops tcmu_genl_ops[] = { |
| { |
| .cmd = TCMU_CMD_SET_FEATURES, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = tcmu_genl_set_features, |
| }, |
| { |
| .cmd = TCMU_CMD_ADDED_DEVICE_DONE, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = tcmu_genl_add_dev_done, |
| }, |
| { |
| .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = tcmu_genl_rm_dev_done, |
| }, |
| { |
| .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = tcmu_genl_reconfig_dev_done, |
| }, |
| }; |
| |
| /* Our generic netlink family */ |
| static struct genl_family tcmu_genl_family __ro_after_init = { |
| .module = THIS_MODULE, |
| .hdrsize = 0, |
| .name = "TCM-USER", |
| .version = 2, |
| .maxattr = TCMU_ATTR_MAX, |
| .policy = tcmu_attr_policy, |
| .mcgrps = tcmu_mcgrps, |
| .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), |
| .netnsok = true, |
| .small_ops = tcmu_genl_ops, |
| .n_small_ops = ARRAY_SIZE(tcmu_genl_ops), |
| }; |
| |
| #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
| #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) |
| #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) |
| #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) |
| |
| static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
| { |
| struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; |
| uint32_t i; |
| |
| for (i = 0; i < len; i++) |
| clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
| } |
| |
| static inline int tcmu_get_empty_block(struct tcmu_dev *udev, |
| struct tcmu_cmd *tcmu_cmd, |
| int prev_dbi, int *iov_cnt) |
| { |
| struct page *page; |
| int ret, dbi; |
| |
| dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
| if (dbi == udev->dbi_thresh) |
| return -1; |
| |
| page = radix_tree_lookup(&udev->data_blocks, dbi); |
| if (!page) { |
| if (atomic_add_return(1, &global_db_count) > |
| tcmu_global_max_blocks) |
| schedule_delayed_work(&tcmu_unmap_work, 0); |
| |
| /* try to get new page from the mm */ |
| page = alloc_page(GFP_NOIO); |
| if (!page) |
| goto err_alloc; |
| |
| ret = radix_tree_insert(&udev->data_blocks, dbi, page); |
| if (ret) |
| goto err_insert; |
| } |
| |
| if (dbi > udev->dbi_max) |
| udev->dbi_max = dbi; |
| |
| set_bit(dbi, udev->data_bitmap); |
| tcmu_cmd_set_dbi(tcmu_cmd, dbi); |
| |
| if (dbi != prev_dbi + 1) |
| *iov_cnt += 1; |
| |
| return dbi; |
| err_insert: |
| __free_page(page); |
| err_alloc: |
| atomic_dec(&global_db_count); |
| return -1; |
| } |
| |
| static int tcmu_get_empty_blocks(struct tcmu_dev *udev, |
| struct tcmu_cmd *tcmu_cmd, int dbi_cnt) |
| { |
| /* start value of dbi + 1 must not be a valid dbi */ |
| int dbi = -2; |
| int i, iov_cnt = 0; |
| |
| for (i = 0; i < dbi_cnt; i++) { |
| dbi = tcmu_get_empty_block(udev, tcmu_cmd, dbi, &iov_cnt); |
| if (dbi < 0) |
| return -1; |
| } |
| return iov_cnt; |
| } |
| |
| static inline struct page * |
| tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
| { |
| return radix_tree_lookup(&udev->data_blocks, dbi); |
| } |
| |
| static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) |
| { |
| kfree(tcmu_cmd->dbi); |
| kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); |
| } |
| |
| static inline void tcmu_cmd_set_block_cnts(struct tcmu_cmd *cmd) |
| { |
| int i, len; |
| struct se_cmd *se_cmd = cmd->se_cmd; |
| |
| cmd->dbi_cnt = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); |
| |
| if (se_cmd->se_cmd_flags & SCF_BIDI) { |
| BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); |
| for (i = 0, len = 0; i < se_cmd->t_bidi_data_nents; i++) |
| len += se_cmd->t_bidi_data_sg[i].length; |
| cmd->dbi_bidi_cnt = DIV_ROUND_UP(len, DATA_BLOCK_SIZE); |
| cmd->dbi_cnt += cmd->dbi_bidi_cnt; |
| cmd->data_len_bidi = len; |
| } |
| } |
| |
| static int new_block_to_iov(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
| struct iovec **iov, int prev_dbi, int len) |
| { |
| /* Get the next dbi */ |
| int dbi = tcmu_cmd_get_dbi(cmd); |
| |
| /* Do not add more than DATA_BLOCK_SIZE to iov */ |
| if (len > DATA_BLOCK_SIZE) |
| len = DATA_BLOCK_SIZE; |
| |
| /* |
| * The following code will gather and map the blocks to the same iovec |
| * when the blocks are all next to each other. |
| */ |
| if (dbi != prev_dbi + 1) { |
| /* dbi is not next to previous dbi, so start new iov */ |
| if (prev_dbi >= 0) |
| (*iov)++; |
| /* write offset relative to mb_addr */ |
| (*iov)->iov_base = (void __user *) |
| (udev->data_off + dbi * DATA_BLOCK_SIZE); |
| } |
| (*iov)->iov_len += len; |
| |
| return dbi; |
| } |
| |
| static void tcmu_setup_iovs(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
| struct iovec **iov, int data_length) |
| { |
| /* start value of dbi + 1 must not be a valid dbi */ |
| int dbi = -2; |
| |
| /* We prepare the IOVs for DMA_FROM_DEVICE transfer direction */ |
| for (; data_length > 0; data_length -= DATA_BLOCK_SIZE) |
| dbi = new_block_to_iov(udev, cmd, iov, dbi, data_length); |
| } |
| |
| static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
| { |
| struct se_device *se_dev = se_cmd->se_dev; |
| struct tcmu_dev *udev = TCMU_DEV(se_dev); |
| struct tcmu_cmd *tcmu_cmd; |
| |
| tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); |
| if (!tcmu_cmd) |
| return NULL; |
| |
| INIT_LIST_HEAD(&tcmu_cmd->queue_entry); |
| tcmu_cmd->se_cmd = se_cmd; |
| tcmu_cmd->tcmu_dev = udev; |
| |
| tcmu_cmd_set_block_cnts(tcmu_cmd); |
| tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), |
| GFP_NOIO); |
| if (!tcmu_cmd->dbi) { |
| kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); |
| return NULL; |
| } |
| |
| return tcmu_cmd; |
| } |
| |
| static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) |
| { |
| unsigned long offset = offset_in_page(vaddr); |
| void *start = vaddr - offset; |
| |
| size = round_up(size+offset, PAGE_SIZE); |
| |
| while (size) { |
| flush_dcache_page(vmalloc_to_page(start)); |
| start += PAGE_SIZE; |
| size -= PAGE_SIZE; |
| } |
| } |
| |
| /* |
| * Some ring helper functions. We don't assume size is a power of 2 so |
| * we can't use circ_buf.h. |
| */ |
| static inline size_t spc_used(size_t head, size_t tail, size_t size) |
| { |
| int diff = head - tail; |
| |
| if (diff >= 0) |
| return diff; |
| else |
| return size + diff; |
| } |
| |
| static inline size_t spc_free(size_t head, size_t tail, size_t size) |
| { |
| /* Keep 1 byte unused or we can't tell full from empty */ |
| return (size - spc_used(head, tail, size) - 1); |
| } |
| |
| static inline size_t head_to_end(size_t head, size_t size) |
| { |
| return size - head; |
| } |
| |
| #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
| |
| #define TCMU_SG_TO_DATA_AREA 1 |
| #define TCMU_DATA_AREA_TO_SG 2 |
| |
| static inline void tcmu_copy_data(struct tcmu_dev *udev, |
| struct tcmu_cmd *tcmu_cmd, uint32_t direction, |
| struct scatterlist *sg, unsigned int sg_nents, |
| struct iovec **iov, size_t data_len) |
| { |
| /* start value of dbi + 1 must not be a valid dbi */ |
| int dbi = -2; |
| size_t block_remaining, cp_len; |
| struct sg_mapping_iter sg_iter; |
| unsigned int sg_flags; |
| struct page *page; |
| void *data_page_start, *data_addr; |
| |
| if (direction == TCMU_SG_TO_DATA_AREA) |
| sg_flags = SG_MITER_ATOMIC | SG_MITER_FROM_SG; |
| else |
| sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; |
| sg_miter_start(&sg_iter, sg, sg_nents, sg_flags); |
| |
| while (data_len) { |
| if (direction == TCMU_SG_TO_DATA_AREA) |
| dbi = new_block_to_iov(udev, tcmu_cmd, iov, dbi, |
| data_len); |
| else |
| dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
| page = tcmu_get_block_page(udev, dbi); |
| if (direction == TCMU_DATA_AREA_TO_SG) |
| flush_dcache_page(page); |
| data_page_start = kmap_atomic(page); |
| block_remaining = DATA_BLOCK_SIZE; |
| |
| while (block_remaining && data_len) { |
| if (!sg_miter_next(&sg_iter)) { |
| /* set length to 0 to abort outer loop */ |
| data_len = 0; |
| pr_debug("tcmu_move_data: aborting data copy due to exhausted sg_list\n"); |
| break; |
| } |
| cp_len = min3(sg_iter.length, block_remaining, data_len); |
| |
| data_addr = data_page_start + |
| DATA_BLOCK_SIZE - block_remaining; |
| if (direction == TCMU_SG_TO_DATA_AREA) |
| memcpy(data_addr, sg_iter.addr, cp_len); |
| else |
| memcpy(sg_iter.addr, data_addr, cp_len); |
| |
| data_len -= cp_len; |
| block_remaining -= cp_len; |
| sg_iter.consumed = cp_len; |
| } |
| sg_miter_stop(&sg_iter); |
| |
| kunmap_atomic(data_page_start); |
| if (direction == TCMU_SG_TO_DATA_AREA) |
| flush_dcache_page(page); |
| } |
| } |
| |
| static void scatter_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, |
| struct iovec **iov) |
| { |
| struct se_cmd *se_cmd = tcmu_cmd->se_cmd; |
| |
| tcmu_copy_data(udev, tcmu_cmd, TCMU_SG_TO_DATA_AREA, se_cmd->t_data_sg, |
| se_cmd->t_data_nents, iov, se_cmd->data_length); |
| } |
| |
| static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, |
| bool bidi, uint32_t read_len) |
| { |
| struct se_cmd *se_cmd = tcmu_cmd->se_cmd; |
| struct scatterlist *data_sg; |
| unsigned int data_nents; |
| |
| if (!bidi) { |
| data_sg = se_cmd->t_data_sg; |
| data_nents = se_cmd->t_data_nents; |
| } else { |
| /* |
| * For bidi case, the first count blocks are for Data-Out |
| * buffer blocks, and before gathering the Data-In buffer |
| * the Data-Out buffer blocks should be skipped. |
| */ |
| tcmu_cmd_set_dbi_cur(tcmu_cmd, |
| tcmu_cmd->dbi_cnt - tcmu_cmd->dbi_bidi_cnt); |
| |
| data_sg = se_cmd->t_bidi_data_sg; |
| data_nents = se_cmd->t_bidi_data_nents; |
| } |
| |
| tcmu_copy_data(udev, tcmu_cmd, TCMU_DATA_AREA_TO_SG, data_sg, |
| data_nents, NULL, read_len); |
| } |
| |
| static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
| { |
| return thresh - bitmap_weight(bitmap, thresh); |
| } |
| |
| /* |
| * We can't queue a command until we have space available on the cmd ring. |
| * |
| * Called with ring lock held. |
| */ |
| static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size) |
| { |
| struct tcmu_mailbox *mb = udev->mb_addr; |
| size_t space, cmd_needed; |
| u32 cmd_head; |
| |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| |
| cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ |
| |
| /* |
| * If cmd end-of-ring space is too small then we need space for a NOP plus |
| * original cmd - cmds are internally contiguous. |
| */ |
| if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) |
| cmd_needed = cmd_size; |
| else |
| cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); |
| |
| space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
| if (space < cmd_needed) { |
| pr_debug("no cmd space: %u %u %u\n", cmd_head, |
| udev->cmdr_last_cleaned, udev->cmdr_size); |
| return false; |
| } |
| return true; |
| } |
| |
| /* |
| * We have to allocate data buffers before we can queue a command. |
| * Returns -1 on error (not enough space) or number of needed iovs on success |
| * |
| * Called with ring lock held. |
| */ |
| static int tcmu_alloc_data_space(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
| int *iov_bidi_cnt) |
| { |
| int space, iov_cnt = 0, ret = 0; |
| |
| if (!cmd->dbi_cnt) |
| goto wr_iov_cnts; |
| |
| /* try to check and get the data blocks as needed */ |
| space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); |
| if (space < cmd->dbi_cnt) { |
| unsigned long blocks_left = |
| (udev->max_blocks - udev->dbi_thresh) + space; |
| |
| if (blocks_left < cmd->dbi_cnt) { |
| pr_debug("no data space: only %lu available, but ask for %lu\n", |
| blocks_left * DATA_BLOCK_SIZE, |
| cmd->dbi_cnt * DATA_BLOCK_SIZE); |
| return -1; |
| } |
| |
| udev->dbi_thresh += cmd->dbi_cnt; |
| if (udev->dbi_thresh > udev->max_blocks) |
| udev->dbi_thresh = udev->max_blocks; |
| } |
| |
| iov_cnt = tcmu_get_empty_blocks(udev, cmd, |
| cmd->dbi_cnt - cmd->dbi_bidi_cnt); |
| if (iov_cnt < 0) |
| return -1; |
| |
| if (cmd->dbi_bidi_cnt) { |
| ret = tcmu_get_empty_blocks(udev, cmd, cmd->dbi_bidi_cnt); |
| if (ret < 0) |
| return -1; |
| } |
| wr_iov_cnts: |
| *iov_bidi_cnt = ret; |
| return iov_cnt + ret; |
| } |
| |
| static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
| { |
| return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), |
| sizeof(struct tcmu_cmd_entry)); |
| } |
| |
| static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, |
| size_t base_command_size) |
| { |
| struct se_cmd *se_cmd = tcmu_cmd->se_cmd; |
| size_t command_size; |
| |
| command_size = base_command_size + |
| round_up(scsi_command_size(se_cmd->t_task_cdb), |
| TCMU_OP_ALIGN_SIZE); |
| |
| WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); |
| |
| return command_size; |
| } |
| |
| static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, |
| struct timer_list *timer) |
| { |
| if (!tmo) |
| return; |
| |
| tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); |
| if (!timer_pending(timer)) |
| mod_timer(timer, tcmu_cmd->deadline); |
| |
| pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, |
| tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); |
| } |
| |
| static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) |
| { |
| struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; |
| unsigned int tmo; |
| |
| /* |
| * For backwards compat if qfull_time_out is not set use |
| * cmd_time_out and if that's not set use the default time out. |
| */ |
| if (!udev->qfull_time_out) |
| return -ETIMEDOUT; |
| else if (udev->qfull_time_out > 0) |
| tmo = udev->qfull_time_out; |
| else if (udev->cmd_time_out) |
| tmo = udev->cmd_time_out; |
| else |
| tmo = TCMU_TIME_OUT; |
| |
| tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); |
| |
| list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); |
| pr_debug("adding cmd %p on dev %s to ring space wait queue\n", |
| tcmu_cmd, udev->name); |
| return 0; |
| } |
| |
| static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) |
| { |
| struct tcmu_cmd_entry_hdr *hdr; |
| struct tcmu_mailbox *mb = udev->mb_addr; |
| uint32_t cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ |
| |
| /* Insert a PAD if end-of-ring space is too small */ |
| if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { |
| size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); |
| |
| hdr = (void *) mb + CMDR_OFF + cmd_head; |
| tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); |
| tcmu_hdr_set_len(&hdr->len_op, pad_size); |
| hdr->cmd_id = 0; /* not used for PAD */ |
| hdr->kflags = 0; |
| hdr->uflags = 0; |
| tcmu_flush_dcache_range(hdr, sizeof(*hdr)); |
| |
| UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| |
| cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ |
| WARN_ON(cmd_head != 0); |
| } |
| |
| return cmd_head; |
| } |
| |
| /** |
| * queue_cmd_ring - queue cmd to ring or internally |
| * @tcmu_cmd: cmd to queue |
| * @scsi_err: TCM error code if failure (-1) returned. |
| * |
| * Returns: |
| * -1 we cannot queue internally or to the ring. |
| * 0 success |
| * 1 internally queued to wait for ring memory to free. |
| */ |
| static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) |
| { |
| struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; |
| struct se_cmd *se_cmd = tcmu_cmd->se_cmd; |
| size_t base_command_size, command_size; |
| struct tcmu_mailbox *mb = udev->mb_addr; |
| struct tcmu_cmd_entry *entry; |
| struct iovec *iov; |
| int iov_cnt, iov_bidi_cnt, cmd_id; |
| uint32_t cmd_head; |
| uint64_t cdb_off; |
| /* size of data buffer needed */ |
| size_t data_length = (size_t)tcmu_cmd->dbi_cnt * DATA_BLOCK_SIZE; |
| |
| *scsi_err = TCM_NO_SENSE; |
| |
| if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { |
| *scsi_err = TCM_LUN_BUSY; |
| return -1; |
| } |
| |
| if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { |
| *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| return -1; |
| } |
| |
| if (!list_empty(&udev->qfull_queue)) |
| goto queue; |
| |
| if (data_length > udev->data_size) { |
| pr_warn("TCMU: Request of size %zu is too big for %zu data area\n", |
| data_length, udev->data_size); |
| *scsi_err = TCM_INVALID_CDB_FIELD; |
| return -1; |
| } |
| |
| iov_cnt = tcmu_alloc_data_space(udev, tcmu_cmd, &iov_bidi_cnt); |
| if (iov_cnt < 0) |
| goto free_and_queue; |
| |
| /* |
| * Must be a certain minimum size for response sense info, but |
| * also may be larger if the iov array is large. |
| */ |
| base_command_size = tcmu_cmd_get_base_cmd_size(iov_cnt); |
| command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); |
| |
| if (command_size > (udev->cmdr_size / 2)) { |
| pr_warn("TCMU: Request of size %zu is too big for %u cmd ring\n", |
| command_size, udev->cmdr_size); |
| tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); |
| *scsi_err = TCM_INVALID_CDB_FIELD; |
| return -1; |
| } |
| |
| if (!is_ring_space_avail(udev, command_size)) |
| /* |
| * Don't leave commands partially setup because the unmap |
| * thread might need the blocks to make forward progress. |
| */ |
| goto free_and_queue; |
| |
| cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); |
| if (cmd_id < 0) { |
| pr_err("tcmu: Could not allocate cmd id.\n"); |
| |
| tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
| *scsi_err = TCM_OUT_OF_RESOURCES; |
| return -1; |
| } |
| tcmu_cmd->cmd_id = cmd_id; |
| |
| pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, |
| tcmu_cmd, udev->name); |
| |
| cmd_head = ring_insert_padding(udev, command_size); |
| |
| entry = (void *) mb + CMDR_OFF + cmd_head; |
| memset(entry, 0, command_size); |
| tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
| |
| /* prepare iov list and copy data to data area if necessary */ |
| tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
| iov = &entry->req.iov[0]; |
| |
| if (se_cmd->data_direction == DMA_TO_DEVICE || |
| se_cmd->se_cmd_flags & SCF_BIDI) |
| scatter_data_area(udev, tcmu_cmd, &iov); |
| else |
| tcmu_setup_iovs(udev, tcmu_cmd, &iov, se_cmd->data_length); |
| |
| entry->req.iov_cnt = iov_cnt - iov_bidi_cnt; |
| |
| /* Handle BIDI commands */ |
| if (se_cmd->se_cmd_flags & SCF_BIDI) { |
| iov++; |
| tcmu_setup_iovs(udev, tcmu_cmd, &iov, tcmu_cmd->data_len_bidi); |
| entry->req.iov_bidi_cnt = iov_bidi_cnt; |
| } |
| |
| tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); |
| |
| entry->hdr.cmd_id = tcmu_cmd->cmd_id; |
| |
| tcmu_hdr_set_len(&entry->hdr.len_op, command_size); |
| |
| /* All offsets relative to mb_addr, not start of entry! */ |
| cdb_off = CMDR_OFF + cmd_head + base_command_size; |
| memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); |
| entry->req.cdb_off = cdb_off; |
| tcmu_flush_dcache_range(entry, command_size); |
| |
| UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| |
| list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); |
| |
| /* TODO: only if FLUSH and FUA? */ |
| uio_event_notify(&udev->uio_info); |
| |
| return 0; |
| |
| free_and_queue: |
| tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); |
| tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
| |
| queue: |
| if (add_to_qfull_queue(tcmu_cmd)) { |
| *scsi_err = TCM_OUT_OF_RESOURCES; |
| return -1; |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * queue_tmr_ring - queue tmr info to ring or internally |
| * @udev: related tcmu_dev |
| * @tmr: tcmu_tmr containing tmr info to queue |
| * |
| * Returns: |
| * 0 success |
| * 1 internally queued to wait for ring memory to free. |
| */ |
| static int |
| queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) |
| { |
| struct tcmu_tmr_entry *entry; |
| int cmd_size; |
| int id_list_sz; |
| struct tcmu_mailbox *mb = udev->mb_addr; |
| uint32_t cmd_head; |
| |
| if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) |
| goto out_free; |
| |
| id_list_sz = sizeof(tmr->tmr_cmd_ids[0]) * tmr->tmr_cmd_cnt; |
| cmd_size = round_up(sizeof(*entry) + id_list_sz, TCMU_OP_ALIGN_SIZE); |
| |
| if (!list_empty(&udev->tmr_queue) || |
| !is_ring_space_avail(udev, cmd_size)) { |
| list_add_tail(&tmr->queue_entry, &udev->tmr_queue); |
| pr_debug("adding tmr %p on dev %s to TMR ring space wait queue\n", |
| tmr, udev->name); |
| return 1; |
| } |
| |
| cmd_head = ring_insert_padding(udev, cmd_size); |
| |
| entry = (void *)mb + CMDR_OFF + cmd_head; |
| memset(entry, 0, cmd_size); |
| tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); |
| tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); |
| entry->tmr_type = tmr->tmr_type; |
| entry->cmd_cnt = tmr->tmr_cmd_cnt; |
| memcpy(&entry->cmd_ids[0], &tmr->tmr_cmd_ids[0], id_list_sz); |
| tcmu_flush_dcache_range(entry, cmd_size); |
| |
| UPDATE_HEAD(mb->cmd_head, cmd_size, udev->cmdr_size); |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| |
| uio_event_notify(&udev->uio_info); |
| |
| out_free: |
| kfree(tmr); |
| |
| return 0; |
| } |
| |
| static sense_reason_t |
| tcmu_queue_cmd(struct se_cmd *se_cmd) |
| { |
| struct se_device *se_dev = se_cmd->se_dev; |
| struct tcmu_dev *udev = TCMU_DEV(se_dev); |
| struct tcmu_cmd *tcmu_cmd; |
| sense_reason_t scsi_ret = TCM_CHECK_CONDITION_ABORT_CMD; |
| int ret = -1; |
| |
| tcmu_cmd = tcmu_alloc_cmd(se_cmd); |
| if (!tcmu_cmd) |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| |
| mutex_lock(&udev->cmdr_lock); |
| if (!(se_cmd->transport_state & CMD_T_ABORTED)) |
| ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); |
| if (ret < 0) |
| tcmu_free_cmd(tcmu_cmd); |
| else |
| se_cmd->priv = tcmu_cmd; |
| mutex_unlock(&udev->cmdr_lock); |
| return scsi_ret; |
| } |
| |
| static void tcmu_set_next_deadline(struct list_head *queue, |
| struct timer_list *timer) |
| { |
| struct tcmu_cmd *cmd; |
| |
| if (!list_empty(queue)) { |
| cmd = list_first_entry(queue, struct tcmu_cmd, queue_entry); |
| mod_timer(timer, cmd->deadline); |
| } else |
| del_timer(timer); |
| } |
| |
| static int |
| tcmu_tmr_type(enum tcm_tmreq_table tmf) |
| { |
| switch (tmf) { |
| case TMR_ABORT_TASK: return TCMU_TMR_ABORT_TASK; |
| case TMR_ABORT_TASK_SET: return TCMU_TMR_ABORT_TASK_SET; |
| case TMR_CLEAR_ACA: return TCMU_TMR_CLEAR_ACA; |
| case TMR_CLEAR_TASK_SET: return TCMU_TMR_CLEAR_TASK_SET; |
| case TMR_LUN_RESET: return TCMU_TMR_LUN_RESET; |
| case TMR_TARGET_WARM_RESET: return TCMU_TMR_TARGET_WARM_RESET; |
| case TMR_TARGET_COLD_RESET: return TCMU_TMR_TARGET_COLD_RESET; |
| case TMR_LUN_RESET_PRO: return TCMU_TMR_LUN_RESET_PRO; |
| default: return TCMU_TMR_UNKNOWN; |
| } |
| } |
| |
| static void |
| tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, |
| struct list_head *cmd_list) |
| { |
| int i = 0, cmd_cnt = 0; |
| bool unqueued = false; |
| uint16_t *cmd_ids = NULL; |
| struct tcmu_cmd *cmd; |
| struct se_cmd *se_cmd; |
| struct tcmu_tmr *tmr; |
| struct tcmu_dev *udev = TCMU_DEV(se_dev); |
| |
| mutex_lock(&udev->cmdr_lock); |
| |
| /* First we check for aborted commands in qfull_queue */ |
| list_for_each_entry(se_cmd, cmd_list, state_list) { |
| i++; |
| if (!se_cmd->priv) |
| continue; |
| cmd = se_cmd->priv; |
| /* Commands on qfull queue have no id yet */ |
| if (cmd->cmd_id) { |
| cmd_cnt++; |
| continue; |
| } |
| pr_debug("Removing aborted command %p from queue on dev %s.\n", |
| cmd, udev->name); |
| |
| list_del_init(&cmd->queue_entry); |
| tcmu_free_cmd(cmd); |
| se_cmd->priv = NULL; |
| target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED); |
| unqueued = true; |
| } |
| if (unqueued) |
| tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); |
| |
| if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) |
| goto unlock; |
| |
| pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", |
| tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); |
| |
| tmr = kmalloc(sizeof(*tmr) + cmd_cnt * sizeof(*cmd_ids), GFP_KERNEL); |
| if (!tmr) |
| goto unlock; |
| |
| tmr->tmr_type = tcmu_tmr_type(tmf); |
| tmr->tmr_cmd_cnt = cmd_cnt; |
| |
| if (cmd_cnt != 0) { |
| cmd_cnt = 0; |
| list_for_each_entry(se_cmd, cmd_list, state_list) { |
| if (!se_cmd->priv) |
| continue; |
| cmd = se_cmd->priv; |
| if (cmd->cmd_id) |
| tmr->tmr_cmd_ids[cmd_cnt++] = cmd->cmd_id; |
| } |
| } |
| |
| queue_tmr_ring(udev, tmr); |
| |
| unlock: |
| mutex_unlock(&udev->cmdr_lock); |
| } |
| |
| static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) |
| { |
| struct se_cmd *se_cmd = cmd->se_cmd; |
| struct tcmu_dev *udev = cmd->tcmu_dev; |
| bool read_len_valid = false; |
| uint32_t read_len; |
| |
| /* |
| * cmd has been completed already from timeout, just reclaim |
| * data area space and free cmd |
| */ |
| if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
| WARN_ON_ONCE(se_cmd); |
| goto out; |
| } |
| |
| list_del_init(&cmd->queue_entry); |
| |
| tcmu_cmd_reset_dbi_cur(cmd); |
| |
| if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
| pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
| cmd->se_cmd); |
| entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
| goto done; |
| } |
| |
| read_len = se_cmd->data_length; |
| if (se_cmd->data_direction == DMA_FROM_DEVICE && |
| (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { |
| read_len_valid = true; |
| if (entry->rsp.read_len < read_len) |
| read_len = entry->rsp.read_len; |
| } |
| |
| if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { |
| transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
| if (!read_len_valid ) |
| goto done; |
| else |
| se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; |
| } |
| if (se_cmd->se_cmd_flags & SCF_BIDI) { |
| /* Get Data-In buffer before clean up */ |
| gather_data_area(udev, cmd, true, read_len); |
| } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
| gather_data_area(udev, cmd, false, read_len); |
| } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
| /* TODO: */ |
| } else if (se_cmd->data_direction != DMA_NONE) { |
| pr_warn("TCMU: data direction was %d!\n", |
| se_cmd->data_direction); |
| } |
| |
| done: |
| se_cmd->priv = NULL; |
| if (read_len_valid) { |
| pr_debug("read_len = %d\n", read_len); |
| target_complete_cmd_with_length(cmd->se_cmd, |
| entry->rsp.scsi_status, read_len); |
| } else |
| target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); |
| |
| out: |
| tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
| tcmu_free_cmd(cmd); |
| } |
| |
| static int tcmu_run_tmr_queue(struct tcmu_dev *udev) |
| { |
| struct tcmu_tmr *tmr, *tmp; |
| LIST_HEAD(tmrs); |
| |
| if (list_empty(&udev->tmr_queue)) |
| return 1; |
| |
| pr_debug("running %s's tmr queue\n", udev->name); |
| |
| list_splice_init(&udev->tmr_queue, &tmrs); |
| |
| list_for_each_entry_safe(tmr, tmp, &tmrs, queue_entry) { |
| list_del_init(&tmr->queue_entry); |
| |
| pr_debug("removing tmr %p on dev %s from queue\n", |
| tmr, udev->name); |
| |
| if (queue_tmr_ring(udev, tmr)) { |
| pr_debug("ran out of space during tmr queue run\n"); |
| /* |
| * tmr was requeued, so just put all tmrs back in |
| * the queue |
| */ |
| list_splice_tail(&tmrs, &udev->tmr_queue); |
| return 0; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) |
| { |
| struct tcmu_mailbox *mb; |
| struct tcmu_cmd *cmd; |
| bool free_space = false; |
| |
| if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { |
| pr_err("ring broken, not handling completions\n"); |
| return 0; |
| } |
| |
| mb = udev->mb_addr; |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| |
| while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { |
| |
| struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; |
| |
| /* |
| * Flush max. up to end of cmd ring since current entry might |
| * be a padding that is shorter than sizeof(*entry) |
| */ |
| size_t ring_left = head_to_end(udev->cmdr_last_cleaned, |
| udev->cmdr_size); |
| tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ? |
| ring_left : sizeof(*entry)); |
| |
| free_space = true; |
| |
| if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD || |
| tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_TMR) { |
| UPDATE_HEAD(udev->cmdr_last_cleaned, |
| tcmu_hdr_get_len(entry->hdr.len_op), |
| udev->cmdr_size); |
| continue; |
| } |
| WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
| |
| cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
| if (!cmd) { |
| pr_err("cmd_id %u not found, ring is broken\n", |
| entry->hdr.cmd_id); |
| set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); |
| break; |
| } |
| |
| tcmu_handle_completion(cmd, entry); |
| |
| UPDATE_HEAD(udev->cmdr_last_cleaned, |
| tcmu_hdr_get_len(entry->hdr.len_op), |
| udev->cmdr_size); |
| } |
| if (free_space) |
| free_space = tcmu_run_tmr_queue(udev); |
| |
| if (atomic_read(&global_db_count) > tcmu_global_max_blocks && |
| idr_is_empty(&udev->commands) && list_empty(&udev->qfull_queue)) { |
| /* |
| * Allocated blocks exceeded global block limit, currently no |
| * more pending or waiting commands so try to reclaim blocks. |
| */ |
| schedule_delayed_work(&tcmu_unmap_work, 0); |
| } |
| if (udev->cmd_time_out) |
| tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); |
| |
| return free_space; |
| } |
| |
| static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) |
| { |
| struct se_cmd *se_cmd; |
| |
| if (!time_after_eq(jiffies, cmd->deadline)) |
| return; |
| |
| set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); |
| list_del_init(&cmd->queue_entry); |
| se_cmd = cmd->se_cmd; |
| se_cmd->priv = NULL; |
| cmd->se_cmd = NULL; |
| |
| pr_debug("Timing out inflight cmd %u on dev %s.\n", |
| cmd->cmd_id, cmd->tcmu_dev->name); |
| |
| target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); |
| } |
| |
| static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) |
| { |
| struct se_cmd *se_cmd; |
| |
| if (!time_after_eq(jiffies, cmd->deadline)) |
| return; |
| |
| pr_debug("Timing out queued cmd %p on dev %s.\n", |
| cmd, cmd->tcmu_dev->name); |
| |
| list_del_init(&cmd->queue_entry); |
| se_cmd = cmd->se_cmd; |
| tcmu_free_cmd(cmd); |
| |
| se_cmd->priv = NULL; |
| target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); |
| } |
| |
| static void tcmu_device_timedout(struct tcmu_dev *udev) |
| { |
| spin_lock(&timed_out_udevs_lock); |
| if (list_empty(&udev->timedout_entry)) |
| list_add_tail(&udev->timedout_entry, &timed_out_udevs); |
| spin_unlock(&timed_out_udevs_lock); |
| |
| schedule_delayed_work(&tcmu_unmap_work, 0); |
| } |
| |
| static void tcmu_cmd_timedout(struct timer_list *t) |
| { |
| struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); |
| |
| pr_debug("%s cmd timeout has expired\n", udev->name); |
| tcmu_device_timedout(udev); |
| } |
| |
| static void tcmu_qfull_timedout(struct timer_list *t) |
| { |
| struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); |
| |
| pr_debug("%s qfull timeout has expired\n", udev->name); |
| tcmu_device_timedout(udev); |
| } |
| |
| static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) |
| { |
| struct tcmu_hba *tcmu_hba; |
| |
| tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); |
| if (!tcmu_hba) |
| return -ENOMEM; |
| |
| tcmu_hba->host_id = host_id; |
| hba->hba_ptr = tcmu_hba; |
| |
| return 0; |
| } |
| |
| static void tcmu_detach_hba(struct se_hba *hba) |
| { |
| kfree(hba->hba_ptr); |
| hba->hba_ptr = NULL; |
| } |
| |
| static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) |
| { |
| struct tcmu_dev *udev; |
| |
| udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); |
| if (!udev) |
| return NULL; |
| kref_init(&udev->kref); |
| |
| udev->name = kstrdup(name, GFP_KERNEL); |
| if (!udev->name) { |
| kfree(udev); |
| return NULL; |
| } |
| |
| udev->hba = hba; |
| udev->cmd_time_out = TCMU_TIME_OUT; |
| udev->qfull_time_out = -1; |
| |
| udev->max_blocks = DATA_BLOCK_BITS_DEF; |
| mutex_init(&udev->cmdr_lock); |
| |
| INIT_LIST_HEAD(&udev->node); |
| INIT_LIST_HEAD(&udev->timedout_entry); |
| INIT_LIST_HEAD(&udev->qfull_queue); |
| INIT_LIST_HEAD(&udev->tmr_queue); |
| INIT_LIST_HEAD(&udev->inflight_queue); |
| idr_init(&udev->commands); |
| |
| timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); |
| timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); |
| |
| INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
| |
| return &udev->se_dev; |
| } |
| |
| static void tcmu_dev_call_rcu(struct rcu_head *p) |
| { |
| struct se_device *dev = container_of(p, struct se_device, rcu_head); |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| |
| kfree(udev->uio_info.name); |
| kfree(udev->name); |
| kfree(udev); |
| } |
| |
| static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
| { |
| if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
| kmem_cache_free(tcmu_cmd_cache, cmd); |
| return 0; |
| } |
| return -EINVAL; |
| } |
| |
| static void tcmu_blocks_release(struct radix_tree_root *blocks, |
| int start, int end) |
| { |
| int i; |
| struct page *page; |
| |
| for (i = start; i < end; i++) { |
| page = radix_tree_delete(blocks, i); |
| if (page) { |
| __free_page(page); |
| atomic_dec(&global_db_count); |
| } |
| } |
| } |
| |
| static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) |
| { |
| struct tcmu_tmr *tmr, *tmp; |
| |
| list_for_each_entry_safe(tmr, tmp, &udev->tmr_queue, queue_entry) { |
| list_del_init(&tmr->queue_entry); |
| kfree(tmr); |
| } |
| } |
| |
| static void tcmu_dev_kref_release(struct kref *kref) |
| { |
| struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); |
| struct se_device *dev = &udev->se_dev; |
| struct tcmu_cmd *cmd; |
| bool all_expired = true; |
| int i; |
| |
| vfree(udev->mb_addr); |
| udev->mb_addr = NULL; |
| |
| spin_lock_bh(&timed_out_udevs_lock); |
| if (!list_empty(&udev->timedout_entry)) |
| list_del(&udev->timedout_entry); |
| spin_unlock_bh(&timed_out_udevs_lock); |
| |
| /* Upper layer should drain all requests before calling this */ |
| mutex_lock(&udev->cmdr_lock); |
| idr_for_each_entry(&udev->commands, cmd, i) { |
| if (tcmu_check_and_free_pending_cmd(cmd) != 0) |
| all_expired = false; |
| } |
| /* There can be left over TMR cmds. Remove them. */ |
| tcmu_remove_all_queued_tmr(udev); |
| if (!list_empty(&udev->qfull_queue)) |
| all_expired = false; |
| idr_destroy(&udev->commands); |
| WARN_ON(!all_expired); |
| |
| tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); |
| bitmap_free(udev->data_bitmap); |
| mutex_unlock(&udev->cmdr_lock); |
| |
| pr_debug("dev_kref_release\n"); |
| |
| call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); |
| } |
| |
| static void run_qfull_queue(struct tcmu_dev *udev, bool fail) |
| { |
| struct tcmu_cmd *tcmu_cmd, *tmp_cmd; |
| LIST_HEAD(cmds); |
| sense_reason_t scsi_ret; |
| int ret; |
| |
| if (list_empty(&udev->qfull_queue)) |
| return; |
| |
| pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); |
| |
| list_splice_init(&udev->qfull_queue, &cmds); |
| |
| list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { |
| list_del_init(&tcmu_cmd->queue_entry); |
| |
| pr_debug("removing cmd %p on dev %s from queue\n", |
| tcmu_cmd, udev->name); |
| |
| if (fail) { |
| /* |
| * We were not able to even start the command, so |
| * fail with busy to allow a retry in case runner |
| * was only temporarily down. If the device is being |
| * removed then LIO core will do the right thing and |
| * fail the retry. |
| */ |
| tcmu_cmd->se_cmd->priv = NULL; |
| target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); |
| tcmu_free_cmd(tcmu_cmd); |
| continue; |
| } |
| |
| ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); |
| if (ret < 0) { |
| pr_debug("cmd %p on dev %s failed with %u\n", |
| tcmu_cmd, udev->name, scsi_ret); |
| /* |
| * Ignore scsi_ret for now. target_complete_cmd |
| * drops it. |
| */ |
| tcmu_cmd->se_cmd->priv = NULL; |
| target_complete_cmd(tcmu_cmd->se_cmd, |
| SAM_STAT_CHECK_CONDITION); |
| tcmu_free_cmd(tcmu_cmd); |
| } else if (ret > 0) { |
| pr_debug("ran out of space during cmdr queue run\n"); |
| /* |
| * cmd was requeued, so just put all cmds back in |
| * the queue |
| */ |
| list_splice_tail(&cmds, &udev->qfull_queue); |
| break; |
| } |
| } |
| |
| tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); |
| } |
| |
| static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) |
| { |
| struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); |
| |
| mutex_lock(&udev->cmdr_lock); |
| if (tcmu_handle_completions(udev)) |
| run_qfull_queue(udev, false); |
| mutex_unlock(&udev->cmdr_lock); |
| |
| return 0; |
| } |
| |
| /* |
| * mmap code from uio.c. Copied here because we want to hook mmap() |
| * and this stuff must come along. |
| */ |
| static int tcmu_find_mem_index(struct vm_area_struct *vma) |
| { |
| struct tcmu_dev *udev = vma->vm_private_data; |
| struct uio_info *info = &udev->uio_info; |
| |
| if (vma->vm_pgoff < MAX_UIO_MAPS) { |
| if (info->mem[vma->vm_pgoff].size == 0) |
| return -1; |
| return (int)vma->vm_pgoff; |
| } |
| return -1; |
| } |
| |
| static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
| { |
| struct page *page; |
| |
| mutex_lock(&udev->cmdr_lock); |
| page = tcmu_get_block_page(udev, dbi); |
| if (likely(page)) { |
| mutex_unlock(&udev->cmdr_lock); |
| return page; |
| } |
| |
| /* |
| * Userspace messed up and passed in a address not in the |
| * data iov passed to it. |
| */ |
| pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", |
| dbi, udev->name); |
| page = NULL; |
| mutex_unlock(&udev->cmdr_lock); |
| |
| return page; |
| } |
| |
| static void tcmu_vma_open(struct vm_area_struct *vma) |
| { |
| struct tcmu_dev *udev = vma->vm_private_data; |
| |
| pr_debug("vma_open\n"); |
| |
| kref_get(&udev->kref); |
| } |
| |
| static void tcmu_vma_close(struct vm_area_struct *vma) |
| { |
| struct tcmu_dev *udev = vma->vm_private_data; |
| |
| pr_debug("vma_close\n"); |
| |
| /* release ref from tcmu_vma_open */ |
| kref_put(&udev->kref, tcmu_dev_kref_release); |
| } |
| |
| static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) |
| { |
| struct tcmu_dev *udev = vmf->vma->vm_private_data; |
| struct uio_info *info = &udev->uio_info; |
| struct page *page; |
| unsigned long offset; |
| void *addr; |
| |
| int mi = tcmu_find_mem_index(vmf->vma); |
| if (mi < 0) |
| return VM_FAULT_SIGBUS; |
| |
| /* |
| * We need to subtract mi because userspace uses offset = N*PAGE_SIZE |
| * to use mem[N]. |
| */ |
| offset = (vmf->pgoff - mi) << PAGE_SHIFT; |
| |
| if (offset < udev->data_off) { |
| /* For the vmalloc()ed cmd area pages */ |
| addr = (void *)(unsigned long)info->mem[mi].addr + offset; |
| page = vmalloc_to_page(addr); |
| } else { |
| uint32_t dbi; |
| |
| /* For the dynamically growing data area pages */ |
| dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
| page = tcmu_try_get_block_page(udev, dbi); |
| if (!page) |
| return VM_FAULT_SIGBUS; |
| } |
| |
| get_page(page); |
| vmf->page = page; |
| return 0; |
| } |
| |
| static const struct vm_operations_struct tcmu_vm_ops = { |
| .open = tcmu_vma_open, |
| .close = tcmu_vma_close, |
| .fault = tcmu_vma_fault, |
| }; |
| |
| static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) |
| { |
| struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); |
| |
| vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
| vma->vm_ops = &tcmu_vm_ops; |
| |
| vma->vm_private_data = udev; |
| |
| /* Ensure the mmap is exactly the right size */ |
| if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) |
| return -EINVAL; |
| |
| tcmu_vma_open(vma); |
| |
| return 0; |
| } |
| |
| static int tcmu_open(struct uio_info *info, struct inode *inode) |
| { |
| struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); |
| |
| /* O_EXCL not supported for char devs, so fake it? */ |
| if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) |
| return -EBUSY; |
| |
| udev->inode = inode; |
| |
| pr_debug("open\n"); |
| |
| return 0; |
| } |
| |
| static int tcmu_release(struct uio_info *info, struct inode *inode) |
| { |
| struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); |
| |
| clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); |
| |
| pr_debug("close\n"); |
| |
| return 0; |
| } |
| |
| static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
| { |
| struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; |
| |
| if (!tcmu_kern_cmd_reply_supported) |
| return 0; |
| |
| if (udev->nl_reply_supported <= 0) |
| return 0; |
| |
| mutex_lock(&tcmu_nl_cmd_mutex); |
| |
| if (tcmu_netlink_blocked) { |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, |
| udev->name); |
| return -EAGAIN; |
| } |
| |
| if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| pr_warn("netlink cmd %d already executing on %s\n", |
| nl_cmd->cmd, udev->name); |
| return -EBUSY; |
| } |
| |
| memset(nl_cmd, 0, sizeof(*nl_cmd)); |
| nl_cmd->cmd = cmd; |
| nl_cmd->udev = udev; |
| init_completion(&nl_cmd->complete); |
| INIT_LIST_HEAD(&nl_cmd->nl_list); |
| |
| list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); |
| |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| return 0; |
| } |
| |
| static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) |
| { |
| struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; |
| |
| if (!tcmu_kern_cmd_reply_supported) |
| return; |
| |
| if (udev->nl_reply_supported <= 0) |
| return; |
| |
| mutex_lock(&tcmu_nl_cmd_mutex); |
| |
| list_del(&nl_cmd->nl_list); |
| memset(nl_cmd, 0, sizeof(*nl_cmd)); |
| |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| } |
| |
| static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) |
| { |
| struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; |
| int ret; |
| |
| if (!tcmu_kern_cmd_reply_supported) |
| return 0; |
| |
| if (udev->nl_reply_supported <= 0) |
| return 0; |
| |
| pr_debug("sleeping for nl reply\n"); |
| wait_for_completion(&nl_cmd->complete); |
| |
| mutex_lock(&tcmu_nl_cmd_mutex); |
| nl_cmd->cmd = TCMU_CMD_UNSPEC; |
| ret = nl_cmd->status; |
| mutex_unlock(&tcmu_nl_cmd_mutex); |
| |
| return ret; |
| } |
| |
| static int tcmu_netlink_event_init(struct tcmu_dev *udev, |
| enum tcmu_genl_cmd cmd, |
| struct sk_buff **buf, void **hdr) |
| { |
| struct sk_buff *skb; |
| void *msg_header; |
| int ret = -ENOMEM; |
| |
| skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!skb) |
| return ret; |
| |
| msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); |
| if (!msg_header) |
| goto free_skb; |
| |
| ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
| if (ret < 0) |
| goto free_skb; |
| |
| ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
| if (ret < 0) |
| goto free_skb; |
| |
| ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); |
| if (ret < 0) |
| goto free_skb; |
| |
| *buf = skb; |
| *hdr = msg_header; |
| return ret; |
| |
| free_skb: |
| nlmsg_free(skb); |
| return ret; |
| } |
| |
| static int tcmu_netlink_event_send(struct tcmu_dev *udev, |
| enum tcmu_genl_cmd cmd, |
| struct sk_buff *skb, void *msg_header) |
| { |
| int ret; |
| |
| genlmsg_end(skb, msg_header); |
| |
| ret = tcmu_init_genl_cmd_reply(udev, cmd); |
| if (ret) { |
| nlmsg_free(skb); |
| return ret; |
| } |
| |
| ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
| TCMU_MCGRP_CONFIG, GFP_KERNEL); |
| |
| /* Wait during an add as the listener may not be up yet */ |
| if (ret == 0 || |
| (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) |
| return tcmu_wait_genl_cmd_reply(udev); |
| else |
| tcmu_destroy_genl_cmd_reply(udev); |
| |
| return ret; |
| } |
| |
| static int tcmu_send_dev_add_event(struct tcmu_dev *udev) |
| { |
| struct sk_buff *skb = NULL; |
| void *msg_header = NULL; |
| int ret = 0; |
| |
| ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, |
| &msg_header); |
| if (ret < 0) |
| return ret; |
| return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, |
| msg_header); |
| } |
| |
| static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) |
| { |
| struct sk_buff *skb = NULL; |
| void *msg_header = NULL; |
| int ret = 0; |
| |
| ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, |
| &skb, &msg_header); |
| if (ret < 0) |
| return ret; |
| return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, |
| skb, msg_header); |
| } |
| |
| static int tcmu_update_uio_info(struct tcmu_dev *udev) |
| { |
| struct tcmu_hba *hba = udev->hba->hba_ptr; |
| struct uio_info *info; |
| char *str; |
| |
| info = &udev->uio_info; |
| |
| if (udev->dev_config[0]) |
| str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, |
| udev->name, udev->dev_config); |
| else |
| str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, |
| udev->name); |
| if (!str) |
| return -ENOMEM; |
| |
| /* If the old string exists, free it */ |
| kfree(info->name); |
| info->name = str; |
| |
| return 0; |
| } |
| |
| static int tcmu_configure_device(struct se_device *dev) |
| { |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| struct uio_info *info; |
| struct tcmu_mailbox *mb; |
| int ret = 0; |
| |
| ret = tcmu_update_uio_info(udev); |
| if (ret) |
| return ret; |
| |
| info = &udev->uio_info; |
| |
| mutex_lock(&udev->cmdr_lock); |
| udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); |
| mutex_unlock(&udev->cmdr_lock); |
| if (!udev->data_bitmap) { |
| ret = -ENOMEM; |
| goto err_bitmap_alloc; |
| } |
| |
| udev->mb_addr = vzalloc(CMDR_SIZE); |
| if (!udev->mb_addr) { |
| ret = -ENOMEM; |
| goto err_vzalloc; |
| } |
| |
| /* mailbox fits in first part of CMDR space */ |
| udev->cmdr_size = CMDR_SIZE - CMDR_OFF; |
| udev->data_off = CMDR_SIZE; |
| udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; |
| udev->dbi_thresh = 0; /* Default in Idle state */ |
| |
| /* Initialise the mailbox of the ring buffer */ |
| mb = udev->mb_addr; |
| mb->version = TCMU_MAILBOX_VERSION; |
| mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | |
| TCMU_MAILBOX_FLAG_CAP_READ_LEN | |
| TCMU_MAILBOX_FLAG_CAP_TMR; |
| mb->cmdr_off = CMDR_OFF; |
| mb->cmdr_size = udev->cmdr_size; |
| |
| WARN_ON(!PAGE_ALIGNED(udev->data_off)); |
| WARN_ON(udev->data_size % PAGE_SIZE); |
| WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
| |
| info->version = __stringify(TCMU_MAILBOX_VERSION); |
| |
| info->mem[0].name = "tcm-user command & data buffer"; |
| info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
| info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; |
| info->mem[0].memtype = UIO_MEM_NONE; |
| |
| info->irqcontrol = tcmu_irqcontrol; |
| info->irq = UIO_IRQ_CUSTOM; |
| |
| info->mmap = tcmu_mmap; |
| info->open = tcmu_open; |
| info->release = tcmu_release; |
| |
| ret = uio_register_device(tcmu_root_device, info); |
| if (ret) |
| goto err_register; |
| |
| /* User can set hw_block_size before enable the device */ |
| if (dev->dev_attrib.hw_block_size == 0) |
| dev->dev_attrib.hw_block_size = 512; |
| /* Other attributes can be configured in userspace */ |
| if (!dev->dev_attrib.hw_max_sectors) |
| dev->dev_attrib.hw_max_sectors = 128; |
| if (!dev->dev_attrib.emulate_write_cache) |
| dev->dev_attrib.emulate_write_cache = 0; |
| dev->dev_attrib.hw_queue_depth = 128; |
| |
| /* If user didn't explicitly disable netlink reply support, use |
| * module scope setting. |
| */ |
| if (udev->nl_reply_supported >= 0) |
| udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; |
| |
| /* |
| * Get a ref incase userspace does a close on the uio device before |
| * LIO has initiated tcmu_free_device. |
| */ |
| kref_get(&udev->kref); |
| |
| ret = tcmu_send_dev_add_event(udev); |
| if (ret) |
| goto err_netlink; |
| |
| mutex_lock(&root_udev_mutex); |
| list_add(&udev->node, &root_udev); |
| mutex_unlock(&root_udev_mutex); |
| |
| return 0; |
| |
| err_netlink: |
| kref_put(&udev->kref, tcmu_dev_kref_release); |
| uio_unregister_device(&udev->uio_info); |
| err_register: |
| vfree(udev->mb_addr); |
| udev->mb_addr = NULL; |
| err_vzalloc: |
| bitmap_free(udev->data_bitmap); |
| udev->data_bitmap = NULL; |
| err_bitmap_alloc: |
| kfree(info->name); |
| info->name = NULL; |
| |
| return ret; |
| } |
| |
| static void tcmu_free_device(struct se_device *dev) |
| { |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| |
| /* release ref from init */ |
| kref_put(&udev->kref, tcmu_dev_kref_release); |
| } |
| |
| static void tcmu_destroy_device(struct se_device *dev) |
| { |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| |
| del_timer_sync(&udev->cmd_timer); |
| del_timer_sync(&udev->qfull_timer); |
| |
| mutex_lock(&root_udev_mutex); |
| list_del(&udev->node); |
| mutex_unlock(&root_udev_mutex); |
| |
| tcmu_send_dev_remove_event(udev); |
| |
| uio_unregister_device(&udev->uio_info); |
| |
| /* release ref from configure */ |
| kref_put(&udev->kref, tcmu_dev_kref_release); |
| } |
| |
| static void tcmu_unblock_dev(struct tcmu_dev *udev) |
| { |
| mutex_lock(&udev->cmdr_lock); |
| clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); |
| mutex_unlock(&udev->cmdr_lock); |
| } |
| |
| static void tcmu_block_dev(struct tcmu_dev *udev) |
| { |
| mutex_lock(&udev->cmdr_lock); |
| |
| if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) |
| goto unlock; |
| |
| /* complete IO that has executed successfully */ |
| tcmu_handle_completions(udev); |
| /* fail IO waiting to be queued */ |
| run_qfull_queue(udev, true); |
| |
| unlock: |
| mutex_unlock(&udev->cmdr_lock); |
| } |
| |
| static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) |
| { |
| struct tcmu_mailbox *mb; |
| struct tcmu_cmd *cmd; |
| int i; |
| |
| mutex_lock(&udev->cmdr_lock); |
| |
| idr_for_each_entry(&udev->commands, cmd, i) { |
| pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", |
| cmd->cmd_id, udev->name, |
| test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); |
| |
| idr_remove(&udev->commands, i); |
| if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
| WARN_ON(!cmd->se_cmd); |
| list_del_init(&cmd->queue_entry); |
| cmd->se_cmd->priv = NULL; |
| if (err_level == 1) { |
| /* |
| * Userspace was not able to start the |
| * command or it is retryable. |
| */ |
| target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); |
| } else { |
| /* hard failure */ |
| target_complete_cmd(cmd->se_cmd, |
| SAM_STAT_CHECK_CONDITION); |
| } |
| } |
| tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
| tcmu_free_cmd(cmd); |
| } |
| |
| mb = udev->mb_addr; |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, |
| mb->cmd_tail, mb->cmd_head); |
| |
| udev->cmdr_last_cleaned = 0; |
| mb->cmd_tail = 0; |
| mb->cmd_head = 0; |
| tcmu_flush_dcache_range(mb, sizeof(*mb)); |
| clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); |
| |
| del_timer(&udev->cmd_timer); |
| |
| /* |
| * ring is empty and qfull queue never contains aborted commands. |
| * So TMRs in tmr queue do not contain relevant cmd_ids. |
| * After a ring reset userspace should do a fresh start, so |
| * even LUN RESET message is no longer relevant. |
| * Therefore remove all TMRs from qfull queue |
| */ |
| tcmu_remove_all_queued_tmr(udev); |
| |
| run_qfull_queue(udev, false); |
| |
| mutex_unlock(&udev->cmdr_lock); |
| } |
| |
| enum { |
| Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
| Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, |
| }; |
| |
| static match_table_t tokens = { |
| {Opt_dev_config, "dev_config=%s"}, |
| {Opt_dev_size, "dev_size=%s"}, |
| {Opt_hw_block_size, "hw_block_size=%d"}, |
| {Opt_hw_max_sectors, "hw_max_sectors=%d"}, |
| {Opt_nl_reply_supported, "nl_reply_supported=%d"}, |
| {Opt_max_data_area_mb, "max_data_area_mb=%d"}, |
| {Opt_err, NULL} |
| }; |
| |
| static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
| { |
| int val, ret; |
| |
| ret = match_int(arg, &val); |
| if (ret < 0) { |
| pr_err("match_int() failed for dev attrib. Error %d.\n", |
| ret); |
| return ret; |
| } |
| |
| if (val <= 0) { |
| pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", |
| val); |
| return -EINVAL; |
| } |
| *dev_attrib = val; |
| return 0; |
| } |
| |
| static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) |
| { |
| int val, ret; |
| |
| ret = match_int(arg, &val); |
| if (ret < 0) { |
| pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", |
| ret); |
| return ret; |
| } |
| |
| if (val <= 0) { |
| pr_err("Invalid max_data_area %d.\n", val); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&udev->cmdr_lock); |
| if (udev->data_bitmap) { |
| pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); |
| ret = -EINVAL; |
| goto unlock; |
| } |
| |
| udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); |
| if (udev->max_blocks > tcmu_global_max_blocks) { |
| pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", |
| val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); |
| udev->max_blocks = tcmu_global_max_blocks; |
| } |
| |
| unlock: |
| mutex_unlock(&udev->cmdr_lock); |
| return ret; |
| } |
| |
| static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
| const char *page, ssize_t count) |
| { |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| char *orig, *ptr, *opts; |
| substring_t args[MAX_OPT_ARGS]; |
| int ret = 0, token; |
| |
| opts = kstrdup(page, GFP_KERNEL); |
| if (!opts) |
| return -ENOMEM; |
| |
| orig = opts; |
| |
| while ((ptr = strsep(&opts, ",\n")) != NULL) { |
| if (!*ptr) |
| continue; |
| |
| token = match_token(ptr, tokens, args); |
| switch (token) { |
| case Opt_dev_config: |
| if (match_strlcpy(udev->dev_config, &args[0], |
| TCMU_CONFIG_LEN) == 0) { |
| ret = -EINVAL; |
| break; |
| } |
| pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); |
| break; |
| case Opt_dev_size: |
| ret = match_u64(&args[0], &udev->dev_size); |
| if (ret < 0) |
| pr_err("match_u64() failed for dev_size=. Error %d.\n", |
| ret); |
| break; |
| case Opt_hw_block_size: |
| ret = tcmu_set_dev_attrib(&args[0], |
| &(dev->dev_attrib.hw_block_size)); |
| break; |
| case Opt_hw_max_sectors: |
| ret = tcmu_set_dev_attrib(&args[0], |
| &(dev->dev_attrib.hw_max_sectors)); |
| break; |
| case Opt_nl_reply_supported: |
| ret = match_int(&args[0], &udev->nl_reply_supported); |
| if (ret < 0) |
| pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", |
| ret); |
| break; |
| case Opt_max_data_area_mb: |
| ret = tcmu_set_max_blocks_param(udev, &args[0]); |
| break; |
| default: |
| break; |
| } |
| |
| if (ret) |
| break; |
| } |
| |
| kfree(orig); |
| return (!ret) ? count : ret; |
| } |
| |
| static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) |
| { |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| ssize_t bl = 0; |
| |
| bl = sprintf(b + bl, "Config: %s ", |
| udev->dev_config[0] ? udev->dev_config : "NULL"); |
| bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); |
| bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", |
| TCMU_BLOCKS_TO_MBS(udev->max_blocks)); |
| |
| return bl; |
| } |
| |
| static sector_t tcmu_get_blocks(struct se_device *dev) |
| { |
| struct tcmu_dev *udev = TCMU_DEV(dev); |
| |
| return div_u64(udev->dev_size - dev->dev_attrib.block_size, |
| dev->dev_attrib.block_size); |
| } |
| |
| static sense_reason_t |
| tcmu_parse_cdb(struct se_cmd *cmd) |
| { |
| return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
| } |
| |
| static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); |
| } |
| |
| static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, |
| size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = container_of(da->da_dev, |
| struct tcmu_dev, se_dev); |
| u32 val; |
| int ret; |
| |
| if (da->da_dev->export_count) { |
| pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); |
| return -EINVAL; |
| } |
| |
| ret = kstrtou32(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| udev->cmd_time_out = val * MSEC_PER_SEC; |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, cmd_time_out); |
| |
| static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? |
| udev->qfull_time_out : |
| udev->qfull_time_out / MSEC_PER_SEC); |
| } |
| |
| static ssize_t tcmu_qfull_time_out_store(struct config_item *item, |
| const char *page, size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| s32 val; |
| int ret; |
| |
| ret = kstrtos32(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| if (val >= 0) { |
| udev->qfull_time_out = val * MSEC_PER_SEC; |
| } else if (val == -1) { |
| udev->qfull_time_out = val; |
| } else { |
| printk(KERN_ERR "Invalid qfull timeout value %d\n", val); |
| return -EINVAL; |
| } |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, qfull_time_out); |
| |
| static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%u\n", |
| TCMU_BLOCKS_TO_MBS(udev->max_blocks)); |
| } |
| CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); |
| |
| static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); |
| } |
| |
| static int tcmu_send_dev_config_event(struct tcmu_dev *udev, |
| const char *reconfig_data) |
| { |
| struct sk_buff *skb = NULL; |
| void *msg_header = NULL; |
| int ret = 0; |
| |
| ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, |
| &skb, &msg_header); |
| if (ret < 0) |
| return ret; |
| ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); |
| if (ret < 0) { |
| nlmsg_free(skb); |
| return ret; |
| } |
| return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, |
| skb, msg_header); |
| } |
| |
| |
| static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
| size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| int ret, len; |
| |
| len = strlen(page); |
| if (!len || len > TCMU_CONFIG_LEN - 1) |
| return -EINVAL; |
| |
| /* Check if device has been configured before */ |
| if (target_dev_configured(&udev->se_dev)) { |
| ret = tcmu_send_dev_config_event(udev, page); |
| if (ret) { |
| pr_err("Unable to reconfigure device\n"); |
| return ret; |
| } |
| strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
| |
| ret = tcmu_update_uio_info(udev); |
| if (ret) |
| return ret; |
| return count; |
| } |
| strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
| |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, dev_config); |
| |
| static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); |
| } |
| |
| static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) |
| { |
| struct sk_buff *skb = NULL; |
| void *msg_header = NULL; |
| int ret = 0; |
| |
| ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, |
| &skb, &msg_header); |
| if (ret < 0) |
| return ret; |
| ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, |
| size, TCMU_ATTR_PAD); |
| if (ret < 0) { |
| nlmsg_free(skb); |
| return ret; |
| } |
| return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, |
| skb, msg_header); |
| } |
| |
| static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, |
| size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| u64 val; |
| int ret; |
| |
| ret = kstrtou64(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| /* Check if device has been configured before */ |
| if (target_dev_configured(&udev->se_dev)) { |
| ret = tcmu_send_dev_size_event(udev, val); |
| if (ret) { |
| pr_err("Unable to reconfigure device\n"); |
| return ret; |
| } |
| } |
| udev->dev_size = val; |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, dev_size); |
| |
| static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, |
| char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); |
| } |
| |
| static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, |
| const char *page, size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| s8 val; |
| int ret; |
| |
| ret = kstrtos8(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| udev->nl_reply_supported = val; |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, nl_reply_supported); |
| |
| static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
| char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| |
| return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); |
| } |
| |
| static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) |
| { |
| struct sk_buff *skb = NULL; |
| void *msg_header = NULL; |
| int ret = 0; |
| |
| ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, |
| &skb, &msg_header); |
| if (ret < 0) |
| return ret; |
| ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); |
| if (ret < 0) { |
| nlmsg_free(skb); |
| return ret; |
| } |
| return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, |
| skb, msg_header); |
| } |
| |
| static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, |
| const char *page, size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| u8 val; |
| int ret; |
| |
| ret = kstrtou8(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| /* Check if device has been configured before */ |
| if (target_dev_configured(&udev->se_dev)) { |
| ret = tcmu_send_emulate_write_cache(udev, val); |
| if (ret) { |
| pr_err("Unable to reconfigure device\n"); |
| return ret; |
| } |
| } |
| |
| da->emulate_write_cache = val; |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, emulate_write_cache); |
| |
| static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| |
| return snprintf(page, PAGE_SIZE, "%i\n", |
| test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); |
| } |
| |
| static ssize_t tcmu_tmr_notification_store(struct config_item *item, |
| const char *page, size_t count) |
| { |
| struct se_dev_attrib *da = container_of(to_config_group(item), |
| struct se_dev_attrib, da_group); |
| struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
| u8 val; |
| int ret; |
| |
| ret = kstrtou8(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| if (val > 1) |
| return -EINVAL; |
| |
| if (val) |
| set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); |
| else |
| clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, tmr_notification); |
| |
| static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) |
| { |
| struct se_device *se_dev = container_of(to_config_group(item), |
| struct se_device, |
| dev_action_group); |
| struct tcmu_dev *udev = TCMU_DEV(se_dev); |
| |
| if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) |
| return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); |
| else |
| return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); |
| } |
| |
| static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, |
| size_t count) |
| { |
| struct se_device *se_dev = container_of(to_config_group(item), |
| struct se_device, |
| dev_action_group); |
| struct tcmu_dev *udev = TCMU_DEV(se_dev); |
| u8 val; |
| int ret; |
| |
| if (!target_dev_configured(&udev->se_dev)) { |
| pr_err("Device is not configured.\n"); |
| return -EINVAL; |
| } |
| |
| ret = kstrtou8(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| if (val > 1) { |
| pr_err("Invalid block value %d\n", val); |
| return -EINVAL; |
| } |
| |
| if (!val) |
| tcmu_unblock_dev(udev); |
| else |
| tcmu_block_dev(udev); |
| return count; |
| } |
| CONFIGFS_ATTR(tcmu_, block_dev); |
| |
| static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, |
| size_t count) |
| { |
| struct se_device *se_dev = container_of(to_config_group(item), |
| struct se_device, |
| dev_action_group); |
| struct tcmu_dev *udev = TCMU_DEV(se_dev); |
| u8 val; |
| int ret; |
| |
| if (!target_dev_configured(&udev->se_dev)) { |
| pr_err("Device is not configured.\n"); |
| return -EINVAL; |
| } |
| |
| ret = kstrtou8(page, 0, &val); |
| if (ret < 0) |
| return ret; |
| |
| if (val != 1 && val != 2) { |
| pr_err("Invalid reset ring value %d\n", val); |
| return -EINVAL; |
| } |
| |
| tcmu_reset_ring(udev, val); |
| return count; |
| } |
| CONFIGFS_ATTR_WO(tcmu_, reset_ring); |
| |
| static struct configfs_attribute *tcmu_attrib_attrs[] = { |
| &tcmu_attr_cmd_time_out, |
| &tcmu_attr_qfull_time_out, |
| &tcmu_attr_max_data_area_mb, |
| &tcmu_attr_dev_config, |
| &tcmu_attr_dev_size, |
| &tcmu_attr_emulate_write_cache, |
| &tcmu_attr_tmr_notification, |
| &tcmu_attr_nl_reply_supported, |
| NULL, |
| }; |
| |
| static struct configfs_attribute **tcmu_attrs; |
| |
| static struct configfs_attribute *tcmu_action_attrs[] = { |
| &tcmu_attr_block_dev, |
| &tcmu_attr_reset_ring, |
| NULL, |
| }; |
| |
| static struct target_backend_ops tcmu_ops = { |
| .name = "user", |
| .owner = THIS_MODULE, |
| .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, |
| .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | |
| TRANSPORT_FLAG_PASSTHROUGH_ALUA, |
| .attach_hba = tcmu_attach_hba, |
| .detach_hba = tcmu_detach_hba, |
| .alloc_device = tcmu_alloc_device, |
| .configure_device = tcmu_configure_device, |
| .destroy_device = tcmu_destroy_device, |
| .free_device = tcmu_free_device, |
| .parse_cdb = tcmu_parse_cdb, |
| .tmr_notify = tcmu_tmr_notify, |
| .set_configfs_dev_params = tcmu_set_configfs_dev_params, |
| .show_configfs_dev_params = tcmu_show_configfs_dev_params, |
| .get_device_type = sbc_get_device_type, |
| .get_blocks = tcmu_get_blocks, |
| .tb_dev_action_attrs = tcmu_action_attrs, |
| }; |
| |
| static void find_free_blocks(void) |
| { |
| struct tcmu_dev *udev; |
| loff_t off; |
| u32 start, end, block, total_freed = 0; |
| |
| if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) |
| return; |
| |
| mutex_lock(&root_udev_mutex); |
| list_for_each_entry(udev, &root_udev, node) { |
| mutex_lock(&udev->cmdr_lock); |
| |
| if (!target_dev_configured(&udev->se_dev)) { |
| mutex_unlock(&udev->cmdr_lock); |
| continue; |
| } |
| |
| /* Try to complete the finished commands first */ |
| if (tcmu_handle_completions(udev)) |
| run_qfull_queue(udev, false); |
| |
| /* Skip the udevs in idle */ |
| if (!udev->dbi_thresh) { |
| mutex_unlock(&udev->cmdr_lock); |
| continue; |
| } |
| |
| end = udev->dbi_max + 1; |
| block = find_last_bit(udev->data_bitmap, end); |
| if (block == udev->dbi_max) { |
| /* |
| * The last bit is dbi_max, so it is not possible |
| * reclaim any blocks. |
| */ |
| mutex_unlock(&udev->cmdr_lock); |
| continue; |
| } else if (block == end) { |
| /* The current udev will goto idle state */ |
| udev->dbi_thresh = start = 0; |
| udev->dbi_max = 0; |
| } else { |
| udev->dbi_thresh = start = block + 1; |
| udev->dbi_max = block; |
| } |
| |
| /* Here will truncate the data area from off */ |
| off = udev->data_off + start * DATA_BLOCK_SIZE; |
| unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); |
| |
| /* Release the block pages */ |
| tcmu_blocks_release(&udev->data_blocks, start, end); |
| mutex_unlock(&udev->cmdr_lock); |
| |
| total_freed += end - start; |
| pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, |
| total_freed, udev->name); |
| } |
| mutex_unlock(&root_udev_mutex); |
| |
| if (atomic_read(&global_db_count) > tcmu_global_max_blocks) |
| schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); |
| } |
| |
| static void check_timedout_devices(void) |
| { |
| struct tcmu_dev *udev, *tmp_dev; |
| struct tcmu_cmd *cmd, *tmp_cmd; |
| LIST_HEAD(devs); |
| |
| spin_lock_bh(&timed_out_udevs_lock); |
| list_splice_init(&timed_out_udevs, &devs); |
| |
| list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { |
| list_del_init(&udev->timedout_entry); |
| spin_unlock_bh(&timed_out_udevs_lock); |
| |
| mutex_lock(&udev->cmdr_lock); |
| |
| /* |
| * If cmd_time_out is disabled but qfull is set deadline |
| * will only reflect the qfull timeout. Ignore it. |
| */ |
| if (udev->cmd_time_out) { |
| list_for_each_entry_safe(cmd, tmp_cmd, |
| &udev->inflight_queue, |
| queue_entry) { |
| tcmu_check_expired_ring_cmd(cmd); |
| } |
| tcmu_set_next_deadline(&udev->inflight_queue, |
| &udev->cmd_timer); |
| } |
| list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, |
| queue_entry) { |
| tcmu_check_expired_queue_cmd(cmd); |
| } |
| tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); |
| |
| mutex_unlock(&udev->cmdr_lock); |
| |
| spin_lock_bh(&timed_out_udevs_lock); |
| } |
| |
| spin_unlock_bh(&timed_out_udevs_lock); |
| } |
| |
| static void tcmu_unmap_work_fn(struct work_struct *work) |
| { |
| check_timedout_devices(); |
| find_free_blocks(); |
| } |
| |
| static int __init tcmu_module_init(void) |
| { |
| int ret, i, k, len = 0; |
| |
| BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); |
| |
| INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); |
| |
| tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", |
| sizeof(struct tcmu_cmd), |
| __alignof__(struct tcmu_cmd), |
| 0, NULL); |
| if (!tcmu_cmd_cache) |
| return -ENOMEM; |
| |
| tcmu_root_device = root_device_register("tcm_user"); |
| if (IS_ERR(tcmu_root_device)) { |
| ret = PTR_ERR(tcmu_root_device); |
| goto out_free_cache; |
| } |
| |
| ret = genl_register_family(&tcmu_genl_family); |
| if (ret < 0) { |
| goto out_unreg_device; |
| } |
| |
| for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) |
| len += sizeof(struct configfs_attribute *); |
| for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) |
| len += sizeof(struct configfs_attribute *); |
| for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) |
| len += sizeof(struct configfs_attribute *); |
| len += sizeof(struct configfs_attribute *); |
| |
| tcmu_attrs = kzalloc(len, GFP_KERNEL); |
| if (!tcmu_attrs) { |
| ret = -ENOMEM; |
| goto out_unreg_genl; |
| } |
| |
| for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) |
| tcmu_attrs[i] = passthrough_attrib_attrs[i]; |
| for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) |
| tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; |
| for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) |
| tcmu_attrs[i++] = tcmu_attrib_attrs[k]; |
| tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
| |
| ret = transport_backend_register(&tcmu_ops); |
| if (ret) |
| goto out_attrs; |
| |
| return 0; |
| |
| out_attrs: |
| kfree(tcmu_attrs); |
| out_unreg_genl: |
| genl_unregister_family(&tcmu_genl_family); |
| out_unreg_device: |
| root_device_unregister(tcmu_root_device); |
| out_free_cache: |
| kmem_cache_destroy(tcmu_cmd_cache); |
| |
| return ret; |
| } |
| |
| static void __exit tcmu_module_exit(void) |
| { |
| cancel_delayed_work_sync(&tcmu_unmap_work); |
| target_backend_unregister(&tcmu_ops); |
| kfree(tcmu_attrs); |
| genl_unregister_family(&tcmu_genl_family); |
| root_device_unregister(tcmu_root_device); |
| kmem_cache_destroy(tcmu_cmd_cache); |
| } |
| |
| MODULE_DESCRIPTION("TCM USER subsystem plugin"); |
| MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); |
| MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(tcmu_module_init); |
| module_exit(tcmu_module_exit); |