Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/char/sclp_cmd.c |
| 3 | * |
| 4 | * Copyright IBM Corp. 2007 |
Heiko Carstens | 4b28a8f | 2008-01-26 14:10:57 +0100 | [diff] [blame] | 5 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
| 6 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <linux/completion.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/string.h> |
Heiko Carstens | e0bc249 | 2008-07-14 09:59:19 +0200 | [diff] [blame] | 14 | #include <linux/mm.h> |
| 15 | #include <linux/mmzone.h> |
| 16 | #include <linux/memory.h> |
Heiko Carstens | 4b28a8f | 2008-01-26 14:10:57 +0100 | [diff] [blame] | 17 | #include <asm/chpid.h> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 18 | #include <asm/sclp.h> |
| 19 | #include "sclp.h" |
| 20 | |
| 21 | #define TAG "sclp_cmd: " |
| 22 | |
| 23 | #define SCLP_CMDW_READ_SCP_INFO 0x00020001 |
| 24 | #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 |
| 25 | |
| 26 | struct read_info_sccb { |
| 27 | struct sccb_header header; /* 0-7 */ |
| 28 | u16 rnmax; /* 8-9 */ |
| 29 | u8 rnsize; /* 10 */ |
| 30 | u8 _reserved0[24 - 11]; /* 11-15 */ |
| 31 | u8 loadparm[8]; /* 24-31 */ |
| 32 | u8 _reserved1[48 - 32]; /* 32-47 */ |
| 33 | u64 facilities; /* 48-55 */ |
| 34 | u8 _reserved2[84 - 56]; /* 56-83 */ |
| 35 | u8 fac84; /* 84 */ |
| 36 | u8 _reserved3[91 - 85]; /* 85-90 */ |
| 37 | u8 flags; /* 91 */ |
| 38 | u8 _reserved4[100 - 92]; /* 92-99 */ |
| 39 | u32 rnsize2; /* 100-103 */ |
| 40 | u64 rnmax2; /* 104-111 */ |
| 41 | u8 _reserved5[4096 - 112]; /* 112-4095 */ |
| 42 | } __attribute__((packed, aligned(PAGE_SIZE))); |
| 43 | |
| 44 | static struct read_info_sccb __initdata early_read_info_sccb; |
| 45 | static int __initdata early_read_info_sccb_valid; |
| 46 | |
| 47 | u64 sclp_facilities; |
| 48 | static u8 sclp_fac84; |
Heiko Carstens | e0bc249 | 2008-07-14 09:59:19 +0200 | [diff] [blame] | 49 | static unsigned long long rzm; |
| 50 | static unsigned long long rnmax; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 51 | |
| 52 | static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) |
| 53 | { |
| 54 | int rc; |
| 55 | |
| 56 | __ctl_set_bit(0, 9); |
| 57 | rc = sclp_service_call(cmd, sccb); |
| 58 | if (rc) |
| 59 | goto out; |
| 60 | __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT | |
| 61 | PSW_MASK_WAIT | PSW_DEFAULT_KEY); |
| 62 | local_irq_disable(); |
| 63 | out: |
| 64 | /* Contents of the sccb might have changed. */ |
| 65 | barrier(); |
| 66 | __ctl_clear_bit(0, 9); |
| 67 | return rc; |
| 68 | } |
| 69 | |
Heiko Carstens | 23d1742 | 2008-07-14 09:59:21 +0200 | [diff] [blame] | 70 | static void __init sclp_read_info_early(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 71 | { |
| 72 | int rc; |
| 73 | int i; |
| 74 | struct read_info_sccb *sccb; |
| 75 | sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, |
| 76 | SCLP_CMDW_READ_SCP_INFO}; |
| 77 | |
| 78 | sccb = &early_read_info_sccb; |
| 79 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
| 80 | do { |
| 81 | memset(sccb, 0, sizeof(*sccb)); |
| 82 | sccb->header.length = sizeof(*sccb); |
| 83 | sccb->header.control_mask[2] = 0x80; |
| 84 | rc = sclp_cmd_sync_early(commands[i], sccb); |
| 85 | } while (rc == -EBUSY); |
| 86 | |
| 87 | if (rc) |
| 88 | break; |
| 89 | if (sccb->header.response_code == 0x10) { |
| 90 | early_read_info_sccb_valid = 1; |
| 91 | break; |
| 92 | } |
| 93 | if (sccb->header.response_code != 0x1f0) |
| 94 | break; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | void __init sclp_facilities_detect(void) |
| 99 | { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 100 | struct read_info_sccb *sccb; |
| 101 | |
Heiko Carstens | 23d1742 | 2008-07-14 09:59:21 +0200 | [diff] [blame] | 102 | sclp_read_info_early(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 103 | if (!early_read_info_sccb_valid) |
Heiko Carstens | 23d1742 | 2008-07-14 09:59:21 +0200 | [diff] [blame] | 104 | return; |
| 105 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 106 | sccb = &early_read_info_sccb; |
Heiko Carstens | 23d1742 | 2008-07-14 09:59:21 +0200 | [diff] [blame] | 107 | sclp_facilities = sccb->facilities; |
| 108 | sclp_fac84 = sccb->fac84; |
Heiko Carstens | e0bc249 | 2008-07-14 09:59:19 +0200 | [diff] [blame] | 109 | rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
| 110 | rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; |
| 111 | rzm <<= 20; |
Heiko Carstens | 23d1742 | 2008-07-14 09:59:21 +0200 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | unsigned long long sclp_get_rnmax(void) |
| 115 | { |
| 116 | return rnmax; |
| 117 | } |
| 118 | |
| 119 | unsigned long long sclp_get_rzm(void) |
| 120 | { |
| 121 | return rzm; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | /* |
Heiko Carstens | 23d1742 | 2008-07-14 09:59:21 +0200 | [diff] [blame] | 125 | * This function will be called after sclp_facilities_detect(), which gets |
| 126 | * called from early.c code. Therefore the sccb should have valid contents. |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 127 | */ |
| 128 | void __init sclp_get_ipl_info(struct sclp_ipl_info *info) |
| 129 | { |
| 130 | struct read_info_sccb *sccb; |
| 131 | |
| 132 | if (!early_read_info_sccb_valid) |
| 133 | return; |
| 134 | sccb = &early_read_info_sccb; |
| 135 | info->is_valid = 1; |
| 136 | if (sccb->flags & 0x2) |
| 137 | info->has_dump = 1; |
| 138 | memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); |
| 139 | } |
| 140 | |
| 141 | static void sclp_sync_callback(struct sclp_req *req, void *data) |
| 142 | { |
| 143 | struct completion *completion = data; |
| 144 | |
| 145 | complete(completion); |
| 146 | } |
| 147 | |
| 148 | static int do_sync_request(sclp_cmdw_t cmd, void *sccb) |
| 149 | { |
| 150 | struct completion completion; |
| 151 | struct sclp_req *request; |
| 152 | int rc; |
| 153 | |
| 154 | request = kzalloc(sizeof(*request), GFP_KERNEL); |
| 155 | if (!request) |
| 156 | return -ENOMEM; |
| 157 | request->command = cmd; |
| 158 | request->sccb = sccb; |
| 159 | request->status = SCLP_REQ_FILLED; |
| 160 | request->callback = sclp_sync_callback; |
| 161 | request->callback_data = &completion; |
| 162 | init_completion(&completion); |
| 163 | |
| 164 | /* Perform sclp request. */ |
| 165 | rc = sclp_add_request(request); |
| 166 | if (rc) |
| 167 | goto out; |
| 168 | wait_for_completion(&completion); |
| 169 | |
| 170 | /* Check response. */ |
| 171 | if (request->status != SCLP_REQ_DONE) { |
| 172 | printk(KERN_WARNING TAG "sync request failed " |
| 173 | "(cmd=0x%08x, status=0x%02x)\n", cmd, request->status); |
| 174 | rc = -EIO; |
| 175 | } |
| 176 | out: |
| 177 | kfree(request); |
| 178 | return rc; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * CPU configuration related functions. |
| 183 | */ |
| 184 | |
| 185 | #define SCLP_CMDW_READ_CPU_INFO 0x00010001 |
| 186 | #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 |
| 187 | #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 |
| 188 | |
| 189 | struct read_cpu_info_sccb { |
| 190 | struct sccb_header header; |
| 191 | u16 nr_configured; |
| 192 | u16 offset_configured; |
| 193 | u16 nr_standby; |
| 194 | u16 offset_standby; |
| 195 | u8 reserved[4096 - 16]; |
| 196 | } __attribute__((packed, aligned(PAGE_SIZE))); |
| 197 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 198 | static void sclp_fill_cpu_info(struct sclp_cpu_info *info, |
| 199 | struct read_cpu_info_sccb *sccb) |
| 200 | { |
| 201 | char *page = (char *) sccb; |
| 202 | |
| 203 | memset(info, 0, sizeof(*info)); |
| 204 | info->configured = sccb->nr_configured; |
| 205 | info->standby = sccb->nr_standby; |
| 206 | info->combined = sccb->nr_configured + sccb->nr_standby; |
| 207 | info->has_cpu_type = sclp_fac84 & 0x1; |
| 208 | memcpy(&info->cpu, page + sccb->offset_configured, |
| 209 | info->combined * sizeof(struct sclp_cpu_entry)); |
| 210 | } |
| 211 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 212 | int sclp_get_cpu_info(struct sclp_cpu_info *info) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 213 | { |
| 214 | int rc; |
| 215 | struct read_cpu_info_sccb *sccb; |
| 216 | |
| 217 | if (!SCLP_HAS_CPU_INFO) |
| 218 | return -EOPNOTSUPP; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 219 | sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 220 | if (!sccb) |
| 221 | return -ENOMEM; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 222 | sccb->header.length = sizeof(*sccb); |
| 223 | rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); |
| 224 | if (rc) |
| 225 | goto out; |
| 226 | if (sccb->header.response_code != 0x0010) { |
| 227 | printk(KERN_WARNING TAG "readcpuinfo failed " |
| 228 | "(response=0x%04x)\n", sccb->header.response_code); |
| 229 | rc = -EIO; |
| 230 | goto out; |
| 231 | } |
| 232 | sclp_fill_cpu_info(info, sccb); |
| 233 | out: |
| 234 | free_page((unsigned long) sccb); |
| 235 | return rc; |
| 236 | } |
| 237 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 238 | struct cpu_configure_sccb { |
| 239 | struct sccb_header header; |
| 240 | } __attribute__((packed, aligned(8))); |
| 241 | |
| 242 | static int do_cpu_configure(sclp_cmdw_t cmd) |
| 243 | { |
| 244 | struct cpu_configure_sccb *sccb; |
| 245 | int rc; |
| 246 | |
| 247 | if (!SCLP_HAS_CPU_RECONFIG) |
| 248 | return -EOPNOTSUPP; |
| 249 | /* |
| 250 | * This is not going to cross a page boundary since we force |
| 251 | * kmalloc to have a minimum alignment of 8 bytes on s390. |
| 252 | */ |
| 253 | sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); |
| 254 | if (!sccb) |
| 255 | return -ENOMEM; |
| 256 | sccb->header.length = sizeof(*sccb); |
| 257 | rc = do_sync_request(cmd, sccb); |
| 258 | if (rc) |
| 259 | goto out; |
| 260 | switch (sccb->header.response_code) { |
| 261 | case 0x0020: |
| 262 | case 0x0120: |
| 263 | break; |
| 264 | default: |
| 265 | printk(KERN_WARNING TAG "configure cpu failed (cmd=0x%08x, " |
| 266 | "response=0x%04x)\n", cmd, sccb->header.response_code); |
| 267 | rc = -EIO; |
| 268 | break; |
| 269 | } |
| 270 | out: |
| 271 | kfree(sccb); |
| 272 | return rc; |
| 273 | } |
| 274 | |
| 275 | int sclp_cpu_configure(u8 cpu) |
| 276 | { |
| 277 | return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); |
| 278 | } |
| 279 | |
| 280 | int sclp_cpu_deconfigure(u8 cpu) |
| 281 | { |
| 282 | return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); |
| 283 | } |
Heiko Carstens | 4b28a8f | 2008-01-26 14:10:57 +0100 | [diff] [blame] | 284 | |
Heiko Carstens | e0bc249 | 2008-07-14 09:59:19 +0200 | [diff] [blame] | 285 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 286 | |
| 287 | static DEFINE_MUTEX(sclp_mem_mutex); |
| 288 | static LIST_HEAD(sclp_mem_list); |
| 289 | static u8 sclp_max_storage_id; |
| 290 | static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; |
| 291 | |
| 292 | struct memory_increment { |
| 293 | struct list_head list; |
| 294 | u16 rn; |
| 295 | int standby; |
| 296 | int usecount; |
| 297 | }; |
| 298 | |
| 299 | struct assign_storage_sccb { |
| 300 | struct sccb_header header; |
| 301 | u16 rn; |
| 302 | } __packed; |
| 303 | |
| 304 | static unsigned long long rn2addr(u16 rn) |
| 305 | { |
| 306 | return (unsigned long long) (rn - 1) * rzm; |
| 307 | } |
| 308 | |
| 309 | static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) |
| 310 | { |
| 311 | struct assign_storage_sccb *sccb; |
| 312 | int rc; |
| 313 | |
| 314 | sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 315 | if (!sccb) |
| 316 | return -ENOMEM; |
| 317 | sccb->header.length = PAGE_SIZE; |
| 318 | sccb->rn = rn; |
| 319 | rc = do_sync_request(cmd, sccb); |
| 320 | if (rc) |
| 321 | goto out; |
| 322 | switch (sccb->header.response_code) { |
| 323 | case 0x0020: |
| 324 | case 0x0120: |
| 325 | break; |
| 326 | default: |
| 327 | rc = -EIO; |
| 328 | break; |
| 329 | } |
| 330 | out: |
| 331 | free_page((unsigned long) sccb); |
| 332 | return rc; |
| 333 | } |
| 334 | |
| 335 | static int sclp_assign_storage(u16 rn) |
| 336 | { |
| 337 | return do_assign_storage(0x000d0001, rn); |
| 338 | } |
| 339 | |
| 340 | static int sclp_unassign_storage(u16 rn) |
| 341 | { |
| 342 | return do_assign_storage(0x000c0001, rn); |
| 343 | } |
| 344 | |
| 345 | struct attach_storage_sccb { |
| 346 | struct sccb_header header; |
| 347 | u16 :16; |
| 348 | u16 assigned; |
| 349 | u32 :32; |
| 350 | u32 entries[0]; |
| 351 | } __packed; |
| 352 | |
| 353 | static int sclp_attach_storage(u8 id) |
| 354 | { |
| 355 | struct attach_storage_sccb *sccb; |
| 356 | int rc; |
| 357 | int i; |
| 358 | |
| 359 | sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 360 | if (!sccb) |
| 361 | return -ENOMEM; |
| 362 | sccb->header.length = PAGE_SIZE; |
| 363 | rc = do_sync_request(0x00080001 | id << 8, sccb); |
| 364 | if (rc) |
| 365 | goto out; |
| 366 | switch (sccb->header.response_code) { |
| 367 | case 0x0020: |
| 368 | set_bit(id, sclp_storage_ids); |
| 369 | for (i = 0; i < sccb->assigned; i++) |
| 370 | sclp_unassign_storage(sccb->entries[i] >> 16); |
| 371 | break; |
| 372 | default: |
| 373 | rc = -EIO; |
| 374 | break; |
| 375 | } |
| 376 | out: |
| 377 | free_page((unsigned long) sccb); |
| 378 | return rc; |
| 379 | } |
| 380 | |
| 381 | static int sclp_mem_change_state(unsigned long start, unsigned long size, |
| 382 | int online) |
| 383 | { |
| 384 | struct memory_increment *incr; |
| 385 | unsigned long long istart; |
| 386 | int rc = 0; |
| 387 | |
| 388 | list_for_each_entry(incr, &sclp_mem_list, list) { |
| 389 | istart = rn2addr(incr->rn); |
| 390 | if (start + size - 1 < istart) |
| 391 | break; |
| 392 | if (start > istart + rzm - 1) |
| 393 | continue; |
| 394 | if (online) { |
| 395 | if (incr->usecount++) |
| 396 | continue; |
| 397 | /* |
| 398 | * Don't break the loop if one assign fails. Loop may |
| 399 | * be walked again on CANCEL and we can't save |
| 400 | * information if state changed before or not. |
| 401 | * So continue and increase usecount for all increments. |
| 402 | */ |
| 403 | rc |= sclp_assign_storage(incr->rn); |
| 404 | } else { |
| 405 | if (--incr->usecount) |
| 406 | continue; |
| 407 | sclp_unassign_storage(incr->rn); |
| 408 | } |
| 409 | } |
| 410 | return rc ? -EIO : 0; |
| 411 | } |
| 412 | |
| 413 | static int sclp_mem_notifier(struct notifier_block *nb, |
| 414 | unsigned long action, void *data) |
| 415 | { |
| 416 | unsigned long start, size; |
| 417 | struct memory_notify *arg; |
| 418 | unsigned char id; |
| 419 | int rc = 0; |
| 420 | |
| 421 | arg = data; |
| 422 | start = arg->start_pfn << PAGE_SHIFT; |
| 423 | size = arg->nr_pages << PAGE_SHIFT; |
| 424 | mutex_lock(&sclp_mem_mutex); |
| 425 | for (id = 0; id <= sclp_max_storage_id; id++) |
| 426 | if (!test_bit(id, sclp_storage_ids)) |
| 427 | sclp_attach_storage(id); |
| 428 | switch (action) { |
| 429 | case MEM_ONLINE: |
Gerald Schaefer | 7e9238f | 2008-08-01 16:39:16 +0200 | [diff] [blame] | 430 | case MEM_GOING_OFFLINE: |
| 431 | case MEM_CANCEL_OFFLINE: |
Heiko Carstens | e0bc249 | 2008-07-14 09:59:19 +0200 | [diff] [blame] | 432 | break; |
| 433 | case MEM_GOING_ONLINE: |
| 434 | rc = sclp_mem_change_state(start, size, 1); |
| 435 | break; |
| 436 | case MEM_CANCEL_ONLINE: |
| 437 | sclp_mem_change_state(start, size, 0); |
| 438 | break; |
Gerald Schaefer | 7e9238f | 2008-08-01 16:39:16 +0200 | [diff] [blame] | 439 | case MEM_OFFLINE: |
| 440 | sclp_mem_change_state(start, size, 0); |
| 441 | break; |
Heiko Carstens | e0bc249 | 2008-07-14 09:59:19 +0200 | [diff] [blame] | 442 | default: |
| 443 | rc = -EINVAL; |
| 444 | break; |
| 445 | } |
| 446 | mutex_unlock(&sclp_mem_mutex); |
| 447 | return rc ? NOTIFY_BAD : NOTIFY_OK; |
| 448 | } |
| 449 | |
| 450 | static struct notifier_block sclp_mem_nb = { |
| 451 | .notifier_call = sclp_mem_notifier, |
| 452 | }; |
| 453 | |
| 454 | static void __init add_memory_merged(u16 rn) |
| 455 | { |
| 456 | static u16 first_rn, num; |
| 457 | unsigned long long start, size; |
| 458 | |
| 459 | if (rn && first_rn && (first_rn + num == rn)) { |
| 460 | num++; |
| 461 | return; |
| 462 | } |
| 463 | if (!first_rn) |
| 464 | goto skip_add; |
| 465 | start = rn2addr(first_rn); |
| 466 | size = (unsigned long long ) num * rzm; |
| 467 | if (start >= VMEM_MAX_PHYS) |
| 468 | goto skip_add; |
| 469 | if (start + size > VMEM_MAX_PHYS) |
| 470 | size = VMEM_MAX_PHYS - start; |
| 471 | add_memory(0, start, size); |
| 472 | skip_add: |
| 473 | first_rn = rn; |
| 474 | num = 1; |
| 475 | } |
| 476 | |
| 477 | static void __init sclp_add_standby_memory(void) |
| 478 | { |
| 479 | struct memory_increment *incr; |
| 480 | |
| 481 | list_for_each_entry(incr, &sclp_mem_list, list) |
| 482 | if (incr->standby) |
| 483 | add_memory_merged(incr->rn); |
| 484 | add_memory_merged(0); |
| 485 | } |
| 486 | |
| 487 | static void __init insert_increment(u16 rn, int standby, int assigned) |
| 488 | { |
| 489 | struct memory_increment *incr, *new_incr; |
| 490 | struct list_head *prev; |
| 491 | u16 last_rn; |
| 492 | |
| 493 | new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); |
| 494 | if (!new_incr) |
| 495 | return; |
| 496 | new_incr->rn = rn; |
| 497 | new_incr->standby = standby; |
| 498 | last_rn = 0; |
| 499 | prev = &sclp_mem_list; |
| 500 | list_for_each_entry(incr, &sclp_mem_list, list) { |
| 501 | if (assigned && incr->rn > rn) |
| 502 | break; |
| 503 | if (!assigned && incr->rn - last_rn > 1) |
| 504 | break; |
| 505 | last_rn = incr->rn; |
| 506 | prev = &incr->list; |
| 507 | } |
| 508 | if (!assigned) |
| 509 | new_incr->rn = last_rn + 1; |
| 510 | if (new_incr->rn > rnmax) { |
| 511 | kfree(new_incr); |
| 512 | return; |
| 513 | } |
| 514 | list_add(&new_incr->list, prev); |
| 515 | } |
| 516 | |
| 517 | struct read_storage_sccb { |
| 518 | struct sccb_header header; |
| 519 | u16 max_id; |
| 520 | u16 assigned; |
| 521 | u16 standby; |
| 522 | u16 :16; |
| 523 | u32 entries[0]; |
| 524 | } __packed; |
| 525 | |
| 526 | static int __init sclp_detect_standby_memory(void) |
| 527 | { |
| 528 | struct read_storage_sccb *sccb; |
| 529 | int i, id, assigned, rc; |
| 530 | |
| 531 | if (!early_read_info_sccb_valid) |
| 532 | return 0; |
| 533 | if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) |
| 534 | return 0; |
| 535 | rc = -ENOMEM; |
| 536 | sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); |
| 537 | if (!sccb) |
| 538 | goto out; |
| 539 | assigned = 0; |
| 540 | for (id = 0; id <= sclp_max_storage_id; id++) { |
| 541 | memset(sccb, 0, PAGE_SIZE); |
| 542 | sccb->header.length = PAGE_SIZE; |
| 543 | rc = do_sync_request(0x00040001 | id << 8, sccb); |
| 544 | if (rc) |
| 545 | goto out; |
| 546 | switch (sccb->header.response_code) { |
| 547 | case 0x0010: |
| 548 | set_bit(id, sclp_storage_ids); |
| 549 | for (i = 0; i < sccb->assigned; i++) { |
| 550 | if (!sccb->entries[i]) |
| 551 | continue; |
| 552 | assigned++; |
| 553 | insert_increment(sccb->entries[i] >> 16, 0, 1); |
| 554 | } |
| 555 | break; |
| 556 | case 0x0310: |
| 557 | break; |
| 558 | case 0x0410: |
| 559 | for (i = 0; i < sccb->assigned; i++) { |
| 560 | if (!sccb->entries[i]) |
| 561 | continue; |
| 562 | assigned++; |
| 563 | insert_increment(sccb->entries[i] >> 16, 1, 1); |
| 564 | } |
| 565 | break; |
| 566 | default: |
| 567 | rc = -EIO; |
| 568 | break; |
| 569 | } |
| 570 | if (!rc) |
| 571 | sclp_max_storage_id = sccb->max_id; |
| 572 | } |
| 573 | if (rc || list_empty(&sclp_mem_list)) |
| 574 | goto out; |
| 575 | for (i = 1; i <= rnmax - assigned; i++) |
| 576 | insert_increment(0, 1, 0); |
| 577 | rc = register_memory_notifier(&sclp_mem_nb); |
| 578 | if (rc) |
| 579 | goto out; |
| 580 | sclp_add_standby_memory(); |
| 581 | out: |
| 582 | free_page((unsigned long) sccb); |
| 583 | return rc; |
| 584 | } |
| 585 | __initcall(sclp_detect_standby_memory); |
| 586 | |
| 587 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 588 | |
Heiko Carstens | 4b28a8f | 2008-01-26 14:10:57 +0100 | [diff] [blame] | 589 | /* |
| 590 | * Channel path configuration related functions. |
| 591 | */ |
| 592 | |
| 593 | #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 |
| 594 | #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 |
| 595 | #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 |
| 596 | |
| 597 | struct chp_cfg_sccb { |
| 598 | struct sccb_header header; |
| 599 | u8 ccm; |
| 600 | u8 reserved[6]; |
| 601 | u8 cssid; |
| 602 | } __attribute__((packed)); |
| 603 | |
| 604 | static int do_chp_configure(sclp_cmdw_t cmd) |
| 605 | { |
| 606 | struct chp_cfg_sccb *sccb; |
| 607 | int rc; |
| 608 | |
| 609 | if (!SCLP_HAS_CHP_RECONFIG) |
| 610 | return -EOPNOTSUPP; |
| 611 | /* Prepare sccb. */ |
| 612 | sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 613 | if (!sccb) |
| 614 | return -ENOMEM; |
| 615 | sccb->header.length = sizeof(*sccb); |
| 616 | rc = do_sync_request(cmd, sccb); |
| 617 | if (rc) |
| 618 | goto out; |
| 619 | switch (sccb->header.response_code) { |
| 620 | case 0x0020: |
| 621 | case 0x0120: |
| 622 | case 0x0440: |
| 623 | case 0x0450: |
| 624 | break; |
| 625 | default: |
| 626 | printk(KERN_WARNING TAG "configure channel-path failed " |
| 627 | "(cmd=0x%08x, response=0x%04x)\n", cmd, |
| 628 | sccb->header.response_code); |
| 629 | rc = -EIO; |
| 630 | break; |
| 631 | } |
| 632 | out: |
| 633 | free_page((unsigned long) sccb); |
| 634 | return rc; |
| 635 | } |
| 636 | |
| 637 | /** |
| 638 | * sclp_chp_configure - perform configure channel-path sclp command |
| 639 | * @chpid: channel-path ID |
| 640 | * |
| 641 | * Perform configure channel-path command sclp command for specified chpid. |
| 642 | * Return 0 after command successfully finished, non-zero otherwise. |
| 643 | */ |
| 644 | int sclp_chp_configure(struct chp_id chpid) |
| 645 | { |
| 646 | return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); |
| 647 | } |
| 648 | |
| 649 | /** |
| 650 | * sclp_chp_deconfigure - perform deconfigure channel-path sclp command |
| 651 | * @chpid: channel-path ID |
| 652 | * |
| 653 | * Perform deconfigure channel-path command sclp command for specified chpid |
| 654 | * and wait for completion. On success return 0. Return non-zero otherwise. |
| 655 | */ |
| 656 | int sclp_chp_deconfigure(struct chp_id chpid) |
| 657 | { |
| 658 | return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); |
| 659 | } |
| 660 | |
| 661 | struct chp_info_sccb { |
| 662 | struct sccb_header header; |
| 663 | u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; |
| 664 | u8 standby[SCLP_CHP_INFO_MASK_SIZE]; |
| 665 | u8 configured[SCLP_CHP_INFO_MASK_SIZE]; |
| 666 | u8 ccm; |
| 667 | u8 reserved[6]; |
| 668 | u8 cssid; |
| 669 | } __attribute__((packed)); |
| 670 | |
| 671 | /** |
| 672 | * sclp_chp_read_info - perform read channel-path information sclp command |
| 673 | * @info: resulting channel-path information data |
| 674 | * |
| 675 | * Perform read channel-path information sclp command and wait for completion. |
| 676 | * On success, store channel-path information in @info and return 0. Return |
| 677 | * non-zero otherwise. |
| 678 | */ |
| 679 | int sclp_chp_read_info(struct sclp_chp_info *info) |
| 680 | { |
| 681 | struct chp_info_sccb *sccb; |
| 682 | int rc; |
| 683 | |
| 684 | if (!SCLP_HAS_CHP_INFO) |
| 685 | return -EOPNOTSUPP; |
| 686 | /* Prepare sccb. */ |
| 687 | sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 688 | if (!sccb) |
| 689 | return -ENOMEM; |
| 690 | sccb->header.length = sizeof(*sccb); |
| 691 | rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); |
| 692 | if (rc) |
| 693 | goto out; |
| 694 | if (sccb->header.response_code != 0x0010) { |
| 695 | printk(KERN_WARNING TAG "read channel-path info failed " |
| 696 | "(response=0x%04x)\n", sccb->header.response_code); |
| 697 | rc = -EIO; |
| 698 | goto out; |
| 699 | } |
| 700 | memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); |
| 701 | memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); |
| 702 | memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); |
| 703 | out: |
| 704 | free_page((unsigned long) sccb); |
| 705 | return rc; |
| 706 | } |