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b60503ba MW |
1 | /* |
2 | * NVM Express device driver | |
6eb0d698 | 3 | * Copyright (c) 2011-2014, Intel Corporation. |
b60503ba MW |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #include <linux/nvme.h> | |
20 | #include <linux/bio.h> | |
8de05535 | 21 | #include <linux/bitops.h> |
b60503ba | 22 | #include <linux/blkdev.h> |
42f61420 | 23 | #include <linux/cpu.h> |
fd63e9ce | 24 | #include <linux/delay.h> |
b60503ba MW |
25 | #include <linux/errno.h> |
26 | #include <linux/fs.h> | |
27 | #include <linux/genhd.h> | |
4cc09e2d | 28 | #include <linux/hdreg.h> |
5aff9382 | 29 | #include <linux/idr.h> |
b60503ba MW |
30 | #include <linux/init.h> |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/io.h> | |
33 | #include <linux/kdev_t.h> | |
1fa6aead | 34 | #include <linux/kthread.h> |
b60503ba MW |
35 | #include <linux/kernel.h> |
36 | #include <linux/mm.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/pci.h> | |
42f61420 | 40 | #include <linux/percpu.h> |
be7b6275 | 41 | #include <linux/poison.h> |
c3bfe717 | 42 | #include <linux/ptrace.h> |
b60503ba MW |
43 | #include <linux/sched.h> |
44 | #include <linux/slab.h> | |
45 | #include <linux/types.h> | |
5d0f6131 | 46 | #include <scsi/sg.h> |
797a796a HM |
47 | #include <asm-generic/io-64-nonatomic-lo-hi.h> |
48 | ||
b60503ba MW |
49 | #define NVME_Q_DEPTH 1024 |
50 | #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) | |
51 | #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) | |
e85248e5 | 52 | #define ADMIN_TIMEOUT (60 * HZ) |
edd10d33 | 53 | #define IOD_TIMEOUT (4 * NVME_IO_TIMEOUT) |
b60503ba | 54 | |
b355084a KB |
55 | unsigned char io_timeout = 30; |
56 | module_param(io_timeout, byte, 0644); | |
57 | MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); | |
b60503ba MW |
58 | |
59 | static int nvme_major; | |
60 | module_param(nvme_major, int, 0); | |
61 | ||
58ffacb5 MW |
62 | static int use_threaded_interrupts; |
63 | module_param(use_threaded_interrupts, int, 0); | |
64 | ||
1fa6aead MW |
65 | static DEFINE_SPINLOCK(dev_list_lock); |
66 | static LIST_HEAD(dev_list); | |
67 | static struct task_struct *nvme_thread; | |
9a6b9458 | 68 | static struct workqueue_struct *nvme_workq; |
b9afca3e | 69 | static wait_queue_head_t nvme_kthread_wait; |
1fa6aead | 70 | |
d4b4ff8e KB |
71 | static void nvme_reset_failed_dev(struct work_struct *ws); |
72 | ||
4d115420 KB |
73 | struct async_cmd_info { |
74 | struct kthread_work work; | |
75 | struct kthread_worker *worker; | |
76 | u32 result; | |
77 | int status; | |
78 | void *ctx; | |
79 | }; | |
1fa6aead | 80 | |
b60503ba MW |
81 | /* |
82 | * An NVM Express queue. Each device has at least two (one for admin | |
83 | * commands and one for I/O commands). | |
84 | */ | |
85 | struct nvme_queue { | |
5a92e700 | 86 | struct rcu_head r_head; |
b60503ba | 87 | struct device *q_dmadev; |
091b6092 | 88 | struct nvme_dev *dev; |
3193f07b | 89 | char irqname[24]; /* nvme4294967295-65535\0 */ |
b60503ba MW |
90 | spinlock_t q_lock; |
91 | struct nvme_command *sq_cmds; | |
92 | volatile struct nvme_completion *cqes; | |
93 | dma_addr_t sq_dma_addr; | |
94 | dma_addr_t cq_dma_addr; | |
95 | wait_queue_head_t sq_full; | |
1fa6aead | 96 | wait_queue_t sq_cong_wait; |
b60503ba | 97 | struct bio_list sq_cong; |
edd10d33 | 98 | struct list_head iod_bio; |
b60503ba MW |
99 | u32 __iomem *q_db; |
100 | u16 q_depth; | |
101 | u16 cq_vector; | |
102 | u16 sq_head; | |
103 | u16 sq_tail; | |
104 | u16 cq_head; | |
c30341dc | 105 | u16 qid; |
e9539f47 MW |
106 | u8 cq_phase; |
107 | u8 cqe_seen; | |
22404274 | 108 | u8 q_suspended; |
42f61420 | 109 | cpumask_var_t cpu_mask; |
4d115420 | 110 | struct async_cmd_info cmdinfo; |
b60503ba MW |
111 | unsigned long cmdid_data[]; |
112 | }; | |
113 | ||
114 | /* | |
115 | * Check we didin't inadvertently grow the command struct | |
116 | */ | |
117 | static inline void _nvme_check_size(void) | |
118 | { | |
119 | BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); | |
120 | BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); | |
121 | BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); | |
122 | BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); | |
123 | BUILD_BUG_ON(sizeof(struct nvme_features) != 64); | |
f8ebf840 | 124 | BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); |
c30341dc | 125 | BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); |
b60503ba MW |
126 | BUILD_BUG_ON(sizeof(struct nvme_command) != 64); |
127 | BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); | |
128 | BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); | |
129 | BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); | |
6ecec745 | 130 | BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); |
b60503ba MW |
131 | } |
132 | ||
edd10d33 | 133 | typedef void (*nvme_completion_fn)(struct nvme_queue *, void *, |
c2f5b650 MW |
134 | struct nvme_completion *); |
135 | ||
e85248e5 | 136 | struct nvme_cmd_info { |
c2f5b650 MW |
137 | nvme_completion_fn fn; |
138 | void *ctx; | |
e85248e5 | 139 | unsigned long timeout; |
c30341dc | 140 | int aborted; |
e85248e5 MW |
141 | }; |
142 | ||
143 | static struct nvme_cmd_info *nvme_cmd_info(struct nvme_queue *nvmeq) | |
144 | { | |
145 | return (void *)&nvmeq->cmdid_data[BITS_TO_LONGS(nvmeq->q_depth)]; | |
146 | } | |
147 | ||
22404274 KB |
148 | static unsigned nvme_queue_extra(int depth) |
149 | { | |
150 | return DIV_ROUND_UP(depth, 8) + (depth * sizeof(struct nvme_cmd_info)); | |
151 | } | |
152 | ||
b60503ba | 153 | /** |
714a7a22 MW |
154 | * alloc_cmdid() - Allocate a Command ID |
155 | * @nvmeq: The queue that will be used for this command | |
156 | * @ctx: A pointer that will be passed to the handler | |
c2f5b650 | 157 | * @handler: The function to call on completion |
b60503ba MW |
158 | * |
159 | * Allocate a Command ID for a queue. The data passed in will | |
160 | * be passed to the completion handler. This is implemented by using | |
161 | * the bottom two bits of the ctx pointer to store the handler ID. | |
162 | * Passing in a pointer that's not 4-byte aligned will cause a BUG. | |
163 | * We can change this if it becomes a problem. | |
184d2944 MW |
164 | * |
165 | * May be called with local interrupts disabled and the q_lock held, | |
166 | * or with interrupts enabled and no locks held. | |
b60503ba | 167 | */ |
c2f5b650 MW |
168 | static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx, |
169 | nvme_completion_fn handler, unsigned timeout) | |
b60503ba | 170 | { |
e6d15f79 | 171 | int depth = nvmeq->q_depth - 1; |
e85248e5 | 172 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
b60503ba MW |
173 | int cmdid; |
174 | ||
b60503ba MW |
175 | do { |
176 | cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth); | |
177 | if (cmdid >= depth) | |
178 | return -EBUSY; | |
179 | } while (test_and_set_bit(cmdid, nvmeq->cmdid_data)); | |
180 | ||
c2f5b650 MW |
181 | info[cmdid].fn = handler; |
182 | info[cmdid].ctx = ctx; | |
e85248e5 | 183 | info[cmdid].timeout = jiffies + timeout; |
c30341dc | 184 | info[cmdid].aborted = 0; |
b60503ba MW |
185 | return cmdid; |
186 | } | |
187 | ||
188 | static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx, | |
c2f5b650 | 189 | nvme_completion_fn handler, unsigned timeout) |
b60503ba MW |
190 | { |
191 | int cmdid; | |
192 | wait_event_killable(nvmeq->sq_full, | |
e85248e5 | 193 | (cmdid = alloc_cmdid(nvmeq, ctx, handler, timeout)) >= 0); |
b60503ba MW |
194 | return (cmdid < 0) ? -EINTR : cmdid; |
195 | } | |
196 | ||
c2f5b650 MW |
197 | /* Special values must be less than 0x1000 */ |
198 | #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA) | |
d2d87034 MW |
199 | #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) |
200 | #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) | |
201 | #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) | |
00df5cb4 | 202 | #define CMD_CTX_FLUSH (0x318 + CMD_CTX_BASE) |
c30341dc | 203 | #define CMD_CTX_ABORT (0x31C + CMD_CTX_BASE) |
be7b6275 | 204 | |
edd10d33 | 205 | static void special_completion(struct nvme_queue *nvmeq, void *ctx, |
c2f5b650 MW |
206 | struct nvme_completion *cqe) |
207 | { | |
208 | if (ctx == CMD_CTX_CANCELLED) | |
209 | return; | |
210 | if (ctx == CMD_CTX_FLUSH) | |
211 | return; | |
c30341dc | 212 | if (ctx == CMD_CTX_ABORT) { |
edd10d33 | 213 | ++nvmeq->dev->abort_limit; |
c30341dc KB |
214 | return; |
215 | } | |
c2f5b650 | 216 | if (ctx == CMD_CTX_COMPLETED) { |
edd10d33 | 217 | dev_warn(nvmeq->q_dmadev, |
c2f5b650 MW |
218 | "completed id %d twice on queue %d\n", |
219 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
220 | return; | |
221 | } | |
222 | if (ctx == CMD_CTX_INVALID) { | |
edd10d33 | 223 | dev_warn(nvmeq->q_dmadev, |
c2f5b650 MW |
224 | "invalid id %d completed on queue %d\n", |
225 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
226 | return; | |
227 | } | |
228 | ||
edd10d33 | 229 | dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n", ctx); |
c2f5b650 MW |
230 | } |
231 | ||
edd10d33 | 232 | static void async_completion(struct nvme_queue *nvmeq, void *ctx, |
4d115420 KB |
233 | struct nvme_completion *cqe) |
234 | { | |
235 | struct async_cmd_info *cmdinfo = ctx; | |
236 | cmdinfo->result = le32_to_cpup(&cqe->result); | |
237 | cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; | |
238 | queue_kthread_work(cmdinfo->worker, &cmdinfo->work); | |
239 | } | |
240 | ||
184d2944 MW |
241 | /* |
242 | * Called with local interrupts disabled and the q_lock held. May not sleep. | |
243 | */ | |
c2f5b650 MW |
244 | static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid, |
245 | nvme_completion_fn *fn) | |
b60503ba | 246 | { |
c2f5b650 | 247 | void *ctx; |
e85248e5 | 248 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
b60503ba | 249 | |
c2f5b650 MW |
250 | if (cmdid >= nvmeq->q_depth) { |
251 | *fn = special_completion; | |
48e3d398 | 252 | return CMD_CTX_INVALID; |
c2f5b650 | 253 | } |
859361a2 KB |
254 | if (fn) |
255 | *fn = info[cmdid].fn; | |
c2f5b650 MW |
256 | ctx = info[cmdid].ctx; |
257 | info[cmdid].fn = special_completion; | |
e85248e5 | 258 | info[cmdid].ctx = CMD_CTX_COMPLETED; |
b60503ba MW |
259 | clear_bit(cmdid, nvmeq->cmdid_data); |
260 | wake_up(&nvmeq->sq_full); | |
c2f5b650 | 261 | return ctx; |
b60503ba MW |
262 | } |
263 | ||
c2f5b650 MW |
264 | static void *cancel_cmdid(struct nvme_queue *nvmeq, int cmdid, |
265 | nvme_completion_fn *fn) | |
3c0cf138 | 266 | { |
c2f5b650 | 267 | void *ctx; |
e85248e5 | 268 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
c2f5b650 MW |
269 | if (fn) |
270 | *fn = info[cmdid].fn; | |
271 | ctx = info[cmdid].ctx; | |
272 | info[cmdid].fn = special_completion; | |
e85248e5 | 273 | info[cmdid].ctx = CMD_CTX_CANCELLED; |
c2f5b650 | 274 | return ctx; |
3c0cf138 MW |
275 | } |
276 | ||
5a92e700 | 277 | static struct nvme_queue *raw_nvmeq(struct nvme_dev *dev, int qid) |
b60503ba | 278 | { |
5a92e700 | 279 | return rcu_dereference_raw(dev->queues[qid]); |
b60503ba MW |
280 | } |
281 | ||
4f5099af | 282 | static struct nvme_queue *get_nvmeq(struct nvme_dev *dev) __acquires(RCU) |
5a92e700 | 283 | { |
42f61420 | 284 | unsigned queue_id = get_cpu_var(*dev->io_queue); |
5a92e700 | 285 | rcu_read_lock(); |
42f61420 | 286 | return rcu_dereference(dev->queues[queue_id]); |
5a92e700 KB |
287 | } |
288 | ||
4f5099af | 289 | static void put_nvmeq(struct nvme_queue *nvmeq) __releases(RCU) |
b60503ba | 290 | { |
5a92e700 | 291 | rcu_read_unlock(); |
42f61420 | 292 | put_cpu_var(nvmeq->dev->io_queue); |
b60503ba MW |
293 | } |
294 | ||
4f5099af KB |
295 | static struct nvme_queue *lock_nvmeq(struct nvme_dev *dev, int q_idx) |
296 | __acquires(RCU) | |
b60503ba | 297 | { |
4f5099af KB |
298 | rcu_read_lock(); |
299 | return rcu_dereference(dev->queues[q_idx]); | |
300 | } | |
301 | ||
302 | static void unlock_nvmeq(struct nvme_queue *nvmeq) __releases(RCU) | |
303 | { | |
304 | rcu_read_unlock(); | |
b60503ba MW |
305 | } |
306 | ||
307 | /** | |
714a7a22 | 308 | * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell |
b60503ba MW |
309 | * @nvmeq: The queue to use |
310 | * @cmd: The command to send | |
311 | * | |
312 | * Safe to use from interrupt context | |
313 | */ | |
314 | static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) | |
315 | { | |
316 | unsigned long flags; | |
317 | u16 tail; | |
b60503ba | 318 | spin_lock_irqsave(&nvmeq->q_lock, flags); |
4f5099af KB |
319 | if (nvmeq->q_suspended) { |
320 | spin_unlock_irqrestore(&nvmeq->q_lock, flags); | |
321 | return -EBUSY; | |
322 | } | |
b60503ba MW |
323 | tail = nvmeq->sq_tail; |
324 | memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); | |
b60503ba MW |
325 | if (++tail == nvmeq->q_depth) |
326 | tail = 0; | |
7547881d | 327 | writel(tail, nvmeq->q_db); |
b60503ba MW |
328 | nvmeq->sq_tail = tail; |
329 | spin_unlock_irqrestore(&nvmeq->q_lock, flags); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
eca18b23 | 334 | static __le64 **iod_list(struct nvme_iod *iod) |
e025344c | 335 | { |
eca18b23 | 336 | return ((void *)iod) + iod->offset; |
e025344c SMM |
337 | } |
338 | ||
eca18b23 MW |
339 | /* |
340 | * Will slightly overestimate the number of pages needed. This is OK | |
341 | * as it only leads to a small amount of wasted memory for the lifetime of | |
342 | * the I/O. | |
343 | */ | |
344 | static int nvme_npages(unsigned size) | |
345 | { | |
346 | unsigned nprps = DIV_ROUND_UP(size + PAGE_SIZE, PAGE_SIZE); | |
347 | return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); | |
348 | } | |
b60503ba | 349 | |
eca18b23 MW |
350 | static struct nvme_iod * |
351 | nvme_alloc_iod(unsigned nseg, unsigned nbytes, gfp_t gfp) | |
b60503ba | 352 | { |
eca18b23 MW |
353 | struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) + |
354 | sizeof(__le64 *) * nvme_npages(nbytes) + | |
355 | sizeof(struct scatterlist) * nseg, gfp); | |
356 | ||
357 | if (iod) { | |
358 | iod->offset = offsetof(struct nvme_iod, sg[nseg]); | |
359 | iod->npages = -1; | |
360 | iod->length = nbytes; | |
2b196034 | 361 | iod->nents = 0; |
edd10d33 | 362 | iod->first_dma = 0ULL; |
6198221f | 363 | iod->start_time = jiffies; |
eca18b23 MW |
364 | } |
365 | ||
366 | return iod; | |
b60503ba MW |
367 | } |
368 | ||
5d0f6131 | 369 | void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) |
b60503ba | 370 | { |
eca18b23 MW |
371 | const int last_prp = PAGE_SIZE / 8 - 1; |
372 | int i; | |
373 | __le64 **list = iod_list(iod); | |
374 | dma_addr_t prp_dma = iod->first_dma; | |
375 | ||
376 | if (iod->npages == 0) | |
377 | dma_pool_free(dev->prp_small_pool, list[0], prp_dma); | |
378 | for (i = 0; i < iod->npages; i++) { | |
379 | __le64 *prp_list = list[i]; | |
380 | dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); | |
381 | dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); | |
382 | prp_dma = next_prp_dma; | |
383 | } | |
384 | kfree(iod); | |
b60503ba MW |
385 | } |
386 | ||
6198221f KB |
387 | static void nvme_start_io_acct(struct bio *bio) |
388 | { | |
389 | struct gendisk *disk = bio->bi_bdev->bd_disk; | |
390 | const int rw = bio_data_dir(bio); | |
391 | int cpu = part_stat_lock(); | |
392 | part_round_stats(cpu, &disk->part0); | |
393 | part_stat_inc(cpu, &disk->part0, ios[rw]); | |
394 | part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio)); | |
395 | part_inc_in_flight(&disk->part0, rw); | |
396 | part_stat_unlock(); | |
397 | } | |
398 | ||
399 | static void nvme_end_io_acct(struct bio *bio, unsigned long start_time) | |
400 | { | |
401 | struct gendisk *disk = bio->bi_bdev->bd_disk; | |
402 | const int rw = bio_data_dir(bio); | |
403 | unsigned long duration = jiffies - start_time; | |
404 | int cpu = part_stat_lock(); | |
405 | part_stat_add(cpu, &disk->part0, ticks[rw], duration); | |
406 | part_round_stats(cpu, &disk->part0); | |
407 | part_dec_in_flight(&disk->part0, rw); | |
408 | part_stat_unlock(); | |
409 | } | |
410 | ||
edd10d33 | 411 | static void bio_completion(struct nvme_queue *nvmeq, void *ctx, |
b60503ba MW |
412 | struct nvme_completion *cqe) |
413 | { | |
eca18b23 MW |
414 | struct nvme_iod *iod = ctx; |
415 | struct bio *bio = iod->private; | |
b60503ba MW |
416 | u16 status = le16_to_cpup(&cqe->status) >> 1; |
417 | ||
edd10d33 KB |
418 | if (unlikely(status)) { |
419 | if (!(status & NVME_SC_DNR || | |
420 | bio->bi_rw & REQ_FAILFAST_MASK) && | |
421 | (jiffies - iod->start_time) < IOD_TIMEOUT) { | |
422 | if (!waitqueue_active(&nvmeq->sq_full)) | |
423 | add_wait_queue(&nvmeq->sq_full, | |
424 | &nvmeq->sq_cong_wait); | |
425 | list_add_tail(&iod->node, &nvmeq->iod_bio); | |
426 | wake_up(&nvmeq->sq_full); | |
427 | return; | |
428 | } | |
429 | } | |
9e59d091 | 430 | if (iod->nents) { |
edd10d33 | 431 | dma_unmap_sg(nvmeq->q_dmadev, iod->sg, iod->nents, |
b60503ba | 432 | bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
9e59d091 KB |
433 | nvme_end_io_acct(bio, iod->start_time); |
434 | } | |
edd10d33 | 435 | nvme_free_iod(nvmeq->dev, iod); |
427e9708 | 436 | if (status) |
1ad2f893 | 437 | bio_endio(bio, -EIO); |
427e9708 | 438 | else |
1ad2f893 | 439 | bio_endio(bio, 0); |
b60503ba MW |
440 | } |
441 | ||
184d2944 | 442 | /* length is in bytes. gfp flags indicates whether we may sleep. */ |
edd10d33 KB |
443 | int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, int total_len, |
444 | gfp_t gfp) | |
ff22b54f | 445 | { |
99802a7a | 446 | struct dma_pool *pool; |
eca18b23 MW |
447 | int length = total_len; |
448 | struct scatterlist *sg = iod->sg; | |
ff22b54f MW |
449 | int dma_len = sg_dma_len(sg); |
450 | u64 dma_addr = sg_dma_address(sg); | |
451 | int offset = offset_in_page(dma_addr); | |
e025344c | 452 | __le64 *prp_list; |
eca18b23 | 453 | __le64 **list = iod_list(iod); |
e025344c | 454 | dma_addr_t prp_dma; |
eca18b23 | 455 | int nprps, i; |
ff22b54f | 456 | |
ff22b54f MW |
457 | length -= (PAGE_SIZE - offset); |
458 | if (length <= 0) | |
eca18b23 | 459 | return total_len; |
ff22b54f MW |
460 | |
461 | dma_len -= (PAGE_SIZE - offset); | |
462 | if (dma_len) { | |
463 | dma_addr += (PAGE_SIZE - offset); | |
464 | } else { | |
465 | sg = sg_next(sg); | |
466 | dma_addr = sg_dma_address(sg); | |
467 | dma_len = sg_dma_len(sg); | |
468 | } | |
469 | ||
470 | if (length <= PAGE_SIZE) { | |
edd10d33 | 471 | iod->first_dma = dma_addr; |
eca18b23 | 472 | return total_len; |
e025344c SMM |
473 | } |
474 | ||
475 | nprps = DIV_ROUND_UP(length, PAGE_SIZE); | |
99802a7a MW |
476 | if (nprps <= (256 / 8)) { |
477 | pool = dev->prp_small_pool; | |
eca18b23 | 478 | iod->npages = 0; |
99802a7a MW |
479 | } else { |
480 | pool = dev->prp_page_pool; | |
eca18b23 | 481 | iod->npages = 1; |
99802a7a MW |
482 | } |
483 | ||
b77954cb MW |
484 | prp_list = dma_pool_alloc(pool, gfp, &prp_dma); |
485 | if (!prp_list) { | |
edd10d33 | 486 | iod->first_dma = dma_addr; |
eca18b23 MW |
487 | iod->npages = -1; |
488 | return (total_len - length) + PAGE_SIZE; | |
b77954cb | 489 | } |
eca18b23 MW |
490 | list[0] = prp_list; |
491 | iod->first_dma = prp_dma; | |
e025344c SMM |
492 | i = 0; |
493 | for (;;) { | |
7523d834 | 494 | if (i == PAGE_SIZE / 8) { |
e025344c | 495 | __le64 *old_prp_list = prp_list; |
b77954cb | 496 | prp_list = dma_pool_alloc(pool, gfp, &prp_dma); |
eca18b23 MW |
497 | if (!prp_list) |
498 | return total_len - length; | |
499 | list[iod->npages++] = prp_list; | |
7523d834 MW |
500 | prp_list[0] = old_prp_list[i - 1]; |
501 | old_prp_list[i - 1] = cpu_to_le64(prp_dma); | |
502 | i = 1; | |
e025344c SMM |
503 | } |
504 | prp_list[i++] = cpu_to_le64(dma_addr); | |
505 | dma_len -= PAGE_SIZE; | |
506 | dma_addr += PAGE_SIZE; | |
507 | length -= PAGE_SIZE; | |
508 | if (length <= 0) | |
509 | break; | |
510 | if (dma_len > 0) | |
511 | continue; | |
512 | BUG_ON(dma_len < 0); | |
513 | sg = sg_next(sg); | |
514 | dma_addr = sg_dma_address(sg); | |
515 | dma_len = sg_dma_len(sg); | |
ff22b54f MW |
516 | } |
517 | ||
eca18b23 | 518 | return total_len; |
ff22b54f MW |
519 | } |
520 | ||
427e9708 | 521 | static int nvme_split_and_submit(struct bio *bio, struct nvme_queue *nvmeq, |
20d0189b | 522 | int len) |
427e9708 | 523 | { |
20d0189b KO |
524 | struct bio *split = bio_split(bio, len >> 9, GFP_ATOMIC, NULL); |
525 | if (!split) | |
427e9708 KB |
526 | return -ENOMEM; |
527 | ||
20d0189b KO |
528 | bio_chain(split, bio); |
529 | ||
edd10d33 | 530 | if (!waitqueue_active(&nvmeq->sq_full)) |
427e9708 | 531 | add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait); |
20d0189b KO |
532 | bio_list_add(&nvmeq->sq_cong, split); |
533 | bio_list_add(&nvmeq->sq_cong, bio); | |
edd10d33 | 534 | wake_up(&nvmeq->sq_full); |
427e9708 KB |
535 | |
536 | return 0; | |
537 | } | |
538 | ||
1ad2f893 MW |
539 | /* NVMe scatterlists require no holes in the virtual address */ |
540 | #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \ | |
541 | (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE)) | |
542 | ||
427e9708 | 543 | static int nvme_map_bio(struct nvme_queue *nvmeq, struct nvme_iod *iod, |
b60503ba MW |
544 | struct bio *bio, enum dma_data_direction dma_dir, int psegs) |
545 | { | |
7988613b KO |
546 | struct bio_vec bvec, bvprv; |
547 | struct bvec_iter iter; | |
76830840 | 548 | struct scatterlist *sg = NULL; |
7988613b KO |
549 | int length = 0, nsegs = 0, split_len = bio->bi_iter.bi_size; |
550 | int first = 1; | |
159b67d7 KB |
551 | |
552 | if (nvmeq->dev->stripe_size) | |
553 | split_len = nvmeq->dev->stripe_size - | |
4f024f37 KO |
554 | ((bio->bi_iter.bi_sector << 9) & |
555 | (nvmeq->dev->stripe_size - 1)); | |
b60503ba | 556 | |
eca18b23 | 557 | sg_init_table(iod->sg, psegs); |
7988613b KO |
558 | bio_for_each_segment(bvec, bio, iter) { |
559 | if (!first && BIOVEC_PHYS_MERGEABLE(&bvprv, &bvec)) { | |
560 | sg->length += bvec.bv_len; | |
76830840 | 561 | } else { |
7988613b KO |
562 | if (!first && BIOVEC_NOT_VIRT_MERGEABLE(&bvprv, &bvec)) |
563 | return nvme_split_and_submit(bio, nvmeq, | |
20d0189b | 564 | length); |
427e9708 | 565 | |
eca18b23 | 566 | sg = sg ? sg + 1 : iod->sg; |
7988613b KO |
567 | sg_set_page(sg, bvec.bv_page, |
568 | bvec.bv_len, bvec.bv_offset); | |
76830840 MW |
569 | nsegs++; |
570 | } | |
159b67d7 | 571 | |
7988613b | 572 | if (split_len - length < bvec.bv_len) |
20d0189b | 573 | return nvme_split_and_submit(bio, nvmeq, split_len); |
7988613b | 574 | length += bvec.bv_len; |
76830840 | 575 | bvprv = bvec; |
7988613b | 576 | first = 0; |
b60503ba | 577 | } |
eca18b23 | 578 | iod->nents = nsegs; |
76830840 | 579 | sg_mark_end(sg); |
427e9708 | 580 | if (dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir) == 0) |
1ad2f893 | 581 | return -ENOMEM; |
427e9708 | 582 | |
4f024f37 | 583 | BUG_ON(length != bio->bi_iter.bi_size); |
1ad2f893 | 584 | return length; |
b60503ba MW |
585 | } |
586 | ||
0e5e4f0e KB |
587 | static int nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, |
588 | struct bio *bio, struct nvme_iod *iod, int cmdid) | |
589 | { | |
edd10d33 KB |
590 | struct nvme_dsm_range *range = |
591 | (struct nvme_dsm_range *)iod_list(iod)[0]; | |
0e5e4f0e KB |
592 | struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; |
593 | ||
0e5e4f0e | 594 | range->cattr = cpu_to_le32(0); |
4f024f37 KO |
595 | range->nlb = cpu_to_le32(bio->bi_iter.bi_size >> ns->lba_shift); |
596 | range->slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_iter.bi_sector)); | |
0e5e4f0e KB |
597 | |
598 | memset(cmnd, 0, sizeof(*cmnd)); | |
599 | cmnd->dsm.opcode = nvme_cmd_dsm; | |
600 | cmnd->dsm.command_id = cmdid; | |
601 | cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); | |
602 | cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma); | |
603 | cmnd->dsm.nr = 0; | |
604 | cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); | |
605 | ||
606 | if (++nvmeq->sq_tail == nvmeq->q_depth) | |
607 | nvmeq->sq_tail = 0; | |
608 | writel(nvmeq->sq_tail, nvmeq->q_db); | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
00df5cb4 MW |
613 | static int nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns, |
614 | int cmdid) | |
615 | { | |
616 | struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; | |
617 | ||
618 | memset(cmnd, 0, sizeof(*cmnd)); | |
619 | cmnd->common.opcode = nvme_cmd_flush; | |
620 | cmnd->common.command_id = cmdid; | |
621 | cmnd->common.nsid = cpu_to_le32(ns->ns_id); | |
622 | ||
623 | if (++nvmeq->sq_tail == nvmeq->q_depth) | |
624 | nvmeq->sq_tail = 0; | |
625 | writel(nvmeq->sq_tail, nvmeq->q_db); | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
5d0f6131 | 630 | int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns) |
00df5cb4 MW |
631 | { |
632 | int cmdid = alloc_cmdid(nvmeq, (void *)CMD_CTX_FLUSH, | |
ff976d72 | 633 | special_completion, NVME_IO_TIMEOUT); |
00df5cb4 MW |
634 | if (unlikely(cmdid < 0)) |
635 | return cmdid; | |
636 | ||
637 | return nvme_submit_flush(nvmeq, ns, cmdid); | |
638 | } | |
639 | ||
edd10d33 | 640 | static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod) |
b60503ba | 641 | { |
edd10d33 KB |
642 | struct bio *bio = iod->private; |
643 | struct nvme_ns *ns = bio->bi_bdev->bd_disk->private_data; | |
ff22b54f | 644 | struct nvme_command *cmnd; |
edd10d33 | 645 | int cmdid; |
b60503ba MW |
646 | u16 control; |
647 | u32 dsmgmt; | |
00df5cb4 | 648 | |
ff976d72 | 649 | cmdid = alloc_cmdid(nvmeq, iod, bio_completion, NVME_IO_TIMEOUT); |
b60503ba | 650 | if (unlikely(cmdid < 0)) |
edd10d33 | 651 | return cmdid; |
b60503ba | 652 | |
edd10d33 KB |
653 | if (bio->bi_rw & REQ_DISCARD) |
654 | return nvme_submit_discard(nvmeq, ns, bio, iod, cmdid); | |
655 | if ((bio->bi_rw & REQ_FLUSH) && !iod->nents) | |
00df5cb4 MW |
656 | return nvme_submit_flush(nvmeq, ns, cmdid); |
657 | ||
b60503ba MW |
658 | control = 0; |
659 | if (bio->bi_rw & REQ_FUA) | |
660 | control |= NVME_RW_FUA; | |
661 | if (bio->bi_rw & (REQ_FAILFAST_DEV | REQ_RAHEAD)) | |
662 | control |= NVME_RW_LR; | |
663 | ||
664 | dsmgmt = 0; | |
665 | if (bio->bi_rw & REQ_RAHEAD) | |
666 | dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; | |
667 | ||
ff22b54f | 668 | cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; |
b8deb62c | 669 | memset(cmnd, 0, sizeof(*cmnd)); |
b60503ba | 670 | |
edd10d33 | 671 | cmnd->rw.opcode = bio_data_dir(bio) ? nvme_cmd_write : nvme_cmd_read; |
ff22b54f MW |
672 | cmnd->rw.command_id = cmdid; |
673 | cmnd->rw.nsid = cpu_to_le32(ns->ns_id); | |
edd10d33 KB |
674 | cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); |
675 | cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); | |
4f024f37 | 676 | cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_iter.bi_sector)); |
edd10d33 KB |
677 | cmnd->rw.length = |
678 | cpu_to_le16((bio->bi_iter.bi_size >> ns->lba_shift) - 1); | |
ff22b54f MW |
679 | cmnd->rw.control = cpu_to_le16(control); |
680 | cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); | |
b60503ba | 681 | |
b60503ba MW |
682 | if (++nvmeq->sq_tail == nvmeq->q_depth) |
683 | nvmeq->sq_tail = 0; | |
7547881d | 684 | writel(nvmeq->sq_tail, nvmeq->q_db); |
b60503ba | 685 | |
1974b1ae | 686 | return 0; |
edd10d33 KB |
687 | } |
688 | ||
689 | /* | |
690 | * Called with local interrupts disabled and the q_lock held. May not sleep. | |
691 | */ | |
692 | static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns, | |
693 | struct bio *bio) | |
694 | { | |
695 | struct nvme_iod *iod; | |
696 | int psegs = bio_phys_segments(ns->queue, bio); | |
697 | int result; | |
698 | ||
699 | if ((bio->bi_rw & REQ_FLUSH) && psegs) { | |
700 | result = nvme_submit_flush_data(nvmeq, ns); | |
701 | if (result) | |
702 | return result; | |
703 | } | |
704 | ||
705 | iod = nvme_alloc_iod(psegs, bio->bi_iter.bi_size, GFP_ATOMIC); | |
706 | if (!iod) | |
707 | return -ENOMEM; | |
708 | ||
709 | iod->private = bio; | |
710 | if (bio->bi_rw & REQ_DISCARD) { | |
711 | void *range; | |
712 | /* | |
713 | * We reuse the small pool to allocate the 16-byte range here | |
714 | * as it is not worth having a special pool for these or | |
715 | * additional cases to handle freeing the iod. | |
716 | */ | |
717 | range = dma_pool_alloc(nvmeq->dev->prp_small_pool, | |
718 | GFP_ATOMIC, | |
719 | &iod->first_dma); | |
720 | if (!range) { | |
721 | result = -ENOMEM; | |
722 | goto free_iod; | |
723 | } | |
724 | iod_list(iod)[0] = (__le64 *)range; | |
725 | iod->npages = 0; | |
726 | } else if (psegs) { | |
727 | result = nvme_map_bio(nvmeq, iod, bio, | |
728 | bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE, | |
729 | psegs); | |
730 | if (result <= 0) | |
731 | goto free_iod; | |
732 | if (nvme_setup_prps(nvmeq->dev, iod, result, GFP_ATOMIC) != | |
733 | result) { | |
734 | result = -ENOMEM; | |
735 | goto free_iod; | |
736 | } | |
737 | nvme_start_io_acct(bio); | |
738 | } | |
739 | if (unlikely(nvme_submit_iod(nvmeq, iod))) { | |
740 | if (!waitqueue_active(&nvmeq->sq_full)) | |
741 | add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait); | |
742 | list_add_tail(&iod->node, &nvmeq->iod_bio); | |
743 | } | |
744 | return 0; | |
1974b1ae | 745 | |
eca18b23 MW |
746 | free_iod: |
747 | nvme_free_iod(nvmeq->dev, iod); | |
eeee3226 | 748 | return result; |
b60503ba MW |
749 | } |
750 | ||
e9539f47 | 751 | static int nvme_process_cq(struct nvme_queue *nvmeq) |
b60503ba | 752 | { |
82123460 | 753 | u16 head, phase; |
b60503ba | 754 | |
b60503ba | 755 | head = nvmeq->cq_head; |
82123460 | 756 | phase = nvmeq->cq_phase; |
b60503ba MW |
757 | |
758 | for (;;) { | |
c2f5b650 MW |
759 | void *ctx; |
760 | nvme_completion_fn fn; | |
b60503ba | 761 | struct nvme_completion cqe = nvmeq->cqes[head]; |
82123460 | 762 | if ((le16_to_cpu(cqe.status) & 1) != phase) |
b60503ba MW |
763 | break; |
764 | nvmeq->sq_head = le16_to_cpu(cqe.sq_head); | |
765 | if (++head == nvmeq->q_depth) { | |
766 | head = 0; | |
82123460 | 767 | phase = !phase; |
b60503ba MW |
768 | } |
769 | ||
c2f5b650 | 770 | ctx = free_cmdid(nvmeq, cqe.command_id, &fn); |
edd10d33 | 771 | fn(nvmeq, ctx, &cqe); |
b60503ba MW |
772 | } |
773 | ||
774 | /* If the controller ignores the cq head doorbell and continuously | |
775 | * writes to the queue, it is theoretically possible to wrap around | |
776 | * the queue twice and mistakenly return IRQ_NONE. Linux only | |
777 | * requires that 0.1% of your interrupts are handled, so this isn't | |
778 | * a big problem. | |
779 | */ | |
82123460 | 780 | if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) |
e9539f47 | 781 | return 0; |
b60503ba | 782 | |
b80d5ccc | 783 | writel(head, nvmeq->q_db + nvmeq->dev->db_stride); |
b60503ba | 784 | nvmeq->cq_head = head; |
82123460 | 785 | nvmeq->cq_phase = phase; |
b60503ba | 786 | |
e9539f47 MW |
787 | nvmeq->cqe_seen = 1; |
788 | return 1; | |
b60503ba MW |
789 | } |
790 | ||
7d822457 MW |
791 | static void nvme_make_request(struct request_queue *q, struct bio *bio) |
792 | { | |
793 | struct nvme_ns *ns = q->queuedata; | |
794 | struct nvme_queue *nvmeq = get_nvmeq(ns->dev); | |
795 | int result = -EBUSY; | |
796 | ||
cd638946 KB |
797 | if (!nvmeq) { |
798 | put_nvmeq(NULL); | |
799 | bio_endio(bio, -EIO); | |
800 | return; | |
801 | } | |
802 | ||
7d822457 | 803 | spin_lock_irq(&nvmeq->q_lock); |
22404274 | 804 | if (!nvmeq->q_suspended && bio_list_empty(&nvmeq->sq_cong)) |
7d822457 MW |
805 | result = nvme_submit_bio_queue(nvmeq, ns, bio); |
806 | if (unlikely(result)) { | |
edd10d33 | 807 | if (!waitqueue_active(&nvmeq->sq_full)) |
7d822457 MW |
808 | add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait); |
809 | bio_list_add(&nvmeq->sq_cong, bio); | |
810 | } | |
811 | ||
812 | nvme_process_cq(nvmeq); | |
813 | spin_unlock_irq(&nvmeq->q_lock); | |
814 | put_nvmeq(nvmeq); | |
815 | } | |
816 | ||
b60503ba | 817 | static irqreturn_t nvme_irq(int irq, void *data) |
58ffacb5 MW |
818 | { |
819 | irqreturn_t result; | |
820 | struct nvme_queue *nvmeq = data; | |
821 | spin_lock(&nvmeq->q_lock); | |
e9539f47 MW |
822 | nvme_process_cq(nvmeq); |
823 | result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; | |
824 | nvmeq->cqe_seen = 0; | |
58ffacb5 MW |
825 | spin_unlock(&nvmeq->q_lock); |
826 | return result; | |
827 | } | |
828 | ||
829 | static irqreturn_t nvme_irq_check(int irq, void *data) | |
830 | { | |
831 | struct nvme_queue *nvmeq = data; | |
832 | struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; | |
833 | if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) | |
834 | return IRQ_NONE; | |
835 | return IRQ_WAKE_THREAD; | |
836 | } | |
837 | ||
3c0cf138 MW |
838 | static void nvme_abort_command(struct nvme_queue *nvmeq, int cmdid) |
839 | { | |
840 | spin_lock_irq(&nvmeq->q_lock); | |
c2f5b650 | 841 | cancel_cmdid(nvmeq, cmdid, NULL); |
3c0cf138 MW |
842 | spin_unlock_irq(&nvmeq->q_lock); |
843 | } | |
844 | ||
c2f5b650 MW |
845 | struct sync_cmd_info { |
846 | struct task_struct *task; | |
847 | u32 result; | |
848 | int status; | |
849 | }; | |
850 | ||
edd10d33 | 851 | static void sync_completion(struct nvme_queue *nvmeq, void *ctx, |
c2f5b650 MW |
852 | struct nvme_completion *cqe) |
853 | { | |
854 | struct sync_cmd_info *cmdinfo = ctx; | |
855 | cmdinfo->result = le32_to_cpup(&cqe->result); | |
856 | cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; | |
857 | wake_up_process(cmdinfo->task); | |
858 | } | |
859 | ||
b60503ba MW |
860 | /* |
861 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
862 | * if the result is positive, it's an NVM Express status code | |
863 | */ | |
4f5099af KB |
864 | static int nvme_submit_sync_cmd(struct nvme_dev *dev, int q_idx, |
865 | struct nvme_command *cmd, | |
5d0f6131 | 866 | u32 *result, unsigned timeout) |
b60503ba | 867 | { |
4f5099af | 868 | int cmdid, ret; |
b60503ba | 869 | struct sync_cmd_info cmdinfo; |
4f5099af KB |
870 | struct nvme_queue *nvmeq; |
871 | ||
872 | nvmeq = lock_nvmeq(dev, q_idx); | |
873 | if (!nvmeq) { | |
874 | unlock_nvmeq(nvmeq); | |
875 | return -ENODEV; | |
876 | } | |
b60503ba MW |
877 | |
878 | cmdinfo.task = current; | |
879 | cmdinfo.status = -EINTR; | |
880 | ||
4f5099af KB |
881 | cmdid = alloc_cmdid(nvmeq, &cmdinfo, sync_completion, timeout); |
882 | if (cmdid < 0) { | |
883 | unlock_nvmeq(nvmeq); | |
b60503ba | 884 | return cmdid; |
4f5099af | 885 | } |
b60503ba MW |
886 | cmd->common.command_id = cmdid; |
887 | ||
3c0cf138 | 888 | set_current_state(TASK_KILLABLE); |
4f5099af KB |
889 | ret = nvme_submit_cmd(nvmeq, cmd); |
890 | if (ret) { | |
891 | free_cmdid(nvmeq, cmdid, NULL); | |
892 | unlock_nvmeq(nvmeq); | |
893 | set_current_state(TASK_RUNNING); | |
894 | return ret; | |
895 | } | |
896 | unlock_nvmeq(nvmeq); | |
78f8d257 | 897 | schedule_timeout(timeout); |
b60503ba | 898 | |
3c0cf138 | 899 | if (cmdinfo.status == -EINTR) { |
4f5099af KB |
900 | nvmeq = lock_nvmeq(dev, q_idx); |
901 | if (nvmeq) | |
902 | nvme_abort_command(nvmeq, cmdid); | |
903 | unlock_nvmeq(nvmeq); | |
3c0cf138 MW |
904 | return -EINTR; |
905 | } | |
906 | ||
b60503ba MW |
907 | if (result) |
908 | *result = cmdinfo.result; | |
909 | ||
910 | return cmdinfo.status; | |
911 | } | |
912 | ||
4d115420 KB |
913 | static int nvme_submit_async_cmd(struct nvme_queue *nvmeq, |
914 | struct nvme_command *cmd, | |
915 | struct async_cmd_info *cmdinfo, unsigned timeout) | |
916 | { | |
917 | int cmdid; | |
918 | ||
919 | cmdid = alloc_cmdid_killable(nvmeq, cmdinfo, async_completion, timeout); | |
920 | if (cmdid < 0) | |
921 | return cmdid; | |
922 | cmdinfo->status = -EINTR; | |
923 | cmd->common.command_id = cmdid; | |
4f5099af | 924 | return nvme_submit_cmd(nvmeq, cmd); |
4d115420 KB |
925 | } |
926 | ||
5d0f6131 | 927 | int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd, |
b60503ba MW |
928 | u32 *result) |
929 | { | |
4f5099af KB |
930 | return nvme_submit_sync_cmd(dev, 0, cmd, result, ADMIN_TIMEOUT); |
931 | } | |
932 | ||
933 | int nvme_submit_io_cmd(struct nvme_dev *dev, struct nvme_command *cmd, | |
934 | u32 *result) | |
935 | { | |
936 | return nvme_submit_sync_cmd(dev, smp_processor_id() + 1, cmd, result, | |
937 | NVME_IO_TIMEOUT); | |
b60503ba MW |
938 | } |
939 | ||
4d115420 KB |
940 | static int nvme_submit_admin_cmd_async(struct nvme_dev *dev, |
941 | struct nvme_command *cmd, struct async_cmd_info *cmdinfo) | |
942 | { | |
5a92e700 | 943 | return nvme_submit_async_cmd(raw_nvmeq(dev, 0), cmd, cmdinfo, |
4d115420 KB |
944 | ADMIN_TIMEOUT); |
945 | } | |
946 | ||
b60503ba MW |
947 | static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) |
948 | { | |
949 | int status; | |
950 | struct nvme_command c; | |
951 | ||
952 | memset(&c, 0, sizeof(c)); | |
953 | c.delete_queue.opcode = opcode; | |
954 | c.delete_queue.qid = cpu_to_le16(id); | |
955 | ||
956 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
957 | if (status) | |
958 | return -EIO; | |
959 | return 0; | |
960 | } | |
961 | ||
962 | static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, | |
963 | struct nvme_queue *nvmeq) | |
964 | { | |
965 | int status; | |
966 | struct nvme_command c; | |
967 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; | |
968 | ||
969 | memset(&c, 0, sizeof(c)); | |
970 | c.create_cq.opcode = nvme_admin_create_cq; | |
971 | c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); | |
972 | c.create_cq.cqid = cpu_to_le16(qid); | |
973 | c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
974 | c.create_cq.cq_flags = cpu_to_le16(flags); | |
975 | c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); | |
976 | ||
977 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
978 | if (status) | |
979 | return -EIO; | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, | |
984 | struct nvme_queue *nvmeq) | |
985 | { | |
986 | int status; | |
987 | struct nvme_command c; | |
988 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; | |
989 | ||
990 | memset(&c, 0, sizeof(c)); | |
991 | c.create_sq.opcode = nvme_admin_create_sq; | |
992 | c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); | |
993 | c.create_sq.sqid = cpu_to_le16(qid); | |
994 | c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
995 | c.create_sq.sq_flags = cpu_to_le16(flags); | |
996 | c.create_sq.cqid = cpu_to_le16(qid); | |
997 | ||
998 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
999 | if (status) | |
1000 | return -EIO; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) | |
1005 | { | |
1006 | return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); | |
1007 | } | |
1008 | ||
1009 | static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) | |
1010 | { | |
1011 | return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); | |
1012 | } | |
1013 | ||
5d0f6131 | 1014 | int nvme_identify(struct nvme_dev *dev, unsigned nsid, unsigned cns, |
bc5fc7e4 MW |
1015 | dma_addr_t dma_addr) |
1016 | { | |
1017 | struct nvme_command c; | |
1018 | ||
1019 | memset(&c, 0, sizeof(c)); | |
1020 | c.identify.opcode = nvme_admin_identify; | |
1021 | c.identify.nsid = cpu_to_le32(nsid); | |
1022 | c.identify.prp1 = cpu_to_le64(dma_addr); | |
1023 | c.identify.cns = cpu_to_le32(cns); | |
1024 | ||
1025 | return nvme_submit_admin_cmd(dev, &c, NULL); | |
1026 | } | |
1027 | ||
5d0f6131 | 1028 | int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, |
08df1e05 | 1029 | dma_addr_t dma_addr, u32 *result) |
bc5fc7e4 MW |
1030 | { |
1031 | struct nvme_command c; | |
1032 | ||
1033 | memset(&c, 0, sizeof(c)); | |
1034 | c.features.opcode = nvme_admin_get_features; | |
a42cecce | 1035 | c.features.nsid = cpu_to_le32(nsid); |
bc5fc7e4 MW |
1036 | c.features.prp1 = cpu_to_le64(dma_addr); |
1037 | c.features.fid = cpu_to_le32(fid); | |
bc5fc7e4 | 1038 | |
08df1e05 | 1039 | return nvme_submit_admin_cmd(dev, &c, result); |
df348139 MW |
1040 | } |
1041 | ||
5d0f6131 VV |
1042 | int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, |
1043 | dma_addr_t dma_addr, u32 *result) | |
df348139 MW |
1044 | { |
1045 | struct nvme_command c; | |
1046 | ||
1047 | memset(&c, 0, sizeof(c)); | |
1048 | c.features.opcode = nvme_admin_set_features; | |
1049 | c.features.prp1 = cpu_to_le64(dma_addr); | |
1050 | c.features.fid = cpu_to_le32(fid); | |
1051 | c.features.dword11 = cpu_to_le32(dword11); | |
1052 | ||
bc5fc7e4 MW |
1053 | return nvme_submit_admin_cmd(dev, &c, result); |
1054 | } | |
1055 | ||
c30341dc KB |
1056 | /** |
1057 | * nvme_abort_cmd - Attempt aborting a command | |
1058 | * @cmdid: Command id of a timed out IO | |
1059 | * @queue: The queue with timed out IO | |
1060 | * | |
1061 | * Schedule controller reset if the command was already aborted once before and | |
1062 | * still hasn't been returned to the driver, or if this is the admin queue. | |
1063 | */ | |
1064 | static void nvme_abort_cmd(int cmdid, struct nvme_queue *nvmeq) | |
1065 | { | |
1066 | int a_cmdid; | |
1067 | struct nvme_command cmd; | |
1068 | struct nvme_dev *dev = nvmeq->dev; | |
1069 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); | |
5a92e700 | 1070 | struct nvme_queue *adminq; |
c30341dc KB |
1071 | |
1072 | if (!nvmeq->qid || info[cmdid].aborted) { | |
1073 | if (work_busy(&dev->reset_work)) | |
1074 | return; | |
1075 | list_del_init(&dev->node); | |
1076 | dev_warn(&dev->pci_dev->dev, | |
1077 | "I/O %d QID %d timeout, reset controller\n", cmdid, | |
1078 | nvmeq->qid); | |
9ca97374 | 1079 | dev->reset_workfn = nvme_reset_failed_dev; |
c30341dc KB |
1080 | queue_work(nvme_workq, &dev->reset_work); |
1081 | return; | |
1082 | } | |
1083 | ||
1084 | if (!dev->abort_limit) | |
1085 | return; | |
1086 | ||
5a92e700 KB |
1087 | adminq = rcu_dereference(dev->queues[0]); |
1088 | a_cmdid = alloc_cmdid(adminq, CMD_CTX_ABORT, special_completion, | |
c30341dc KB |
1089 | ADMIN_TIMEOUT); |
1090 | if (a_cmdid < 0) | |
1091 | return; | |
1092 | ||
1093 | memset(&cmd, 0, sizeof(cmd)); | |
1094 | cmd.abort.opcode = nvme_admin_abort_cmd; | |
1095 | cmd.abort.cid = cmdid; | |
1096 | cmd.abort.sqid = cpu_to_le16(nvmeq->qid); | |
1097 | cmd.abort.command_id = a_cmdid; | |
1098 | ||
1099 | --dev->abort_limit; | |
1100 | info[cmdid].aborted = 1; | |
1101 | info[cmdid].timeout = jiffies + ADMIN_TIMEOUT; | |
1102 | ||
1103 | dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", cmdid, | |
1104 | nvmeq->qid); | |
5a92e700 | 1105 | nvme_submit_cmd(adminq, &cmd); |
c30341dc KB |
1106 | } |
1107 | ||
a09115b2 MW |
1108 | /** |
1109 | * nvme_cancel_ios - Cancel outstanding I/Os | |
1110 | * @queue: The queue to cancel I/Os on | |
1111 | * @timeout: True to only cancel I/Os which have timed out | |
1112 | */ | |
1113 | static void nvme_cancel_ios(struct nvme_queue *nvmeq, bool timeout) | |
1114 | { | |
1115 | int depth = nvmeq->q_depth - 1; | |
1116 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); | |
1117 | unsigned long now = jiffies; | |
1118 | int cmdid; | |
1119 | ||
1120 | for_each_set_bit(cmdid, nvmeq->cmdid_data, depth) { | |
1121 | void *ctx; | |
1122 | nvme_completion_fn fn; | |
1123 | static struct nvme_completion cqe = { | |
af2d9ca7 | 1124 | .status = cpu_to_le16(NVME_SC_ABORT_REQ << 1), |
a09115b2 MW |
1125 | }; |
1126 | ||
1127 | if (timeout && !time_after(now, info[cmdid].timeout)) | |
1128 | continue; | |
053ab702 KB |
1129 | if (info[cmdid].ctx == CMD_CTX_CANCELLED) |
1130 | continue; | |
c30341dc KB |
1131 | if (timeout && nvmeq->dev->initialized) { |
1132 | nvme_abort_cmd(cmdid, nvmeq); | |
1133 | continue; | |
1134 | } | |
1135 | dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n", cmdid, | |
1136 | nvmeq->qid); | |
a09115b2 | 1137 | ctx = cancel_cmdid(nvmeq, cmdid, &fn); |
edd10d33 | 1138 | fn(nvmeq, ctx, &cqe); |
a09115b2 MW |
1139 | } |
1140 | } | |
1141 | ||
5a92e700 | 1142 | static void nvme_free_queue(struct rcu_head *r) |
9e866774 | 1143 | { |
5a92e700 KB |
1144 | struct nvme_queue *nvmeq = container_of(r, struct nvme_queue, r_head); |
1145 | ||
22404274 KB |
1146 | spin_lock_irq(&nvmeq->q_lock); |
1147 | while (bio_list_peek(&nvmeq->sq_cong)) { | |
1148 | struct bio *bio = bio_list_pop(&nvmeq->sq_cong); | |
1149 | bio_endio(bio, -EIO); | |
1150 | } | |
edd10d33 KB |
1151 | while (!list_empty(&nvmeq->iod_bio)) { |
1152 | static struct nvme_completion cqe = { | |
1153 | .status = cpu_to_le16( | |
1154 | (NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1), | |
1155 | }; | |
1156 | struct nvme_iod *iod = list_first_entry(&nvmeq->iod_bio, | |
1157 | struct nvme_iod, | |
1158 | node); | |
1159 | list_del(&iod->node); | |
1160 | bio_completion(nvmeq, iod, &cqe); | |
1161 | } | |
22404274 KB |
1162 | spin_unlock_irq(&nvmeq->q_lock); |
1163 | ||
9e866774 MW |
1164 | dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), |
1165 | (void *)nvmeq->cqes, nvmeq->cq_dma_addr); | |
1166 | dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), | |
1167 | nvmeq->sq_cmds, nvmeq->sq_dma_addr); | |
42f61420 KB |
1168 | if (nvmeq->qid) |
1169 | free_cpumask_var(nvmeq->cpu_mask); | |
9e866774 MW |
1170 | kfree(nvmeq); |
1171 | } | |
1172 | ||
a1a5ef99 | 1173 | static void nvme_free_queues(struct nvme_dev *dev, int lowest) |
22404274 KB |
1174 | { |
1175 | int i; | |
1176 | ||
a1a5ef99 | 1177 | for (i = dev->queue_count - 1; i >= lowest; i--) { |
5a92e700 KB |
1178 | struct nvme_queue *nvmeq = raw_nvmeq(dev, i); |
1179 | rcu_assign_pointer(dev->queues[i], NULL); | |
1180 | call_rcu(&nvmeq->r_head, nvme_free_queue); | |
22404274 | 1181 | dev->queue_count--; |
22404274 KB |
1182 | } |
1183 | } | |
1184 | ||
4d115420 KB |
1185 | /** |
1186 | * nvme_suspend_queue - put queue into suspended state | |
1187 | * @nvmeq - queue to suspend | |
1188 | * | |
1189 | * Returns 1 if already suspended, 0 otherwise. | |
1190 | */ | |
1191 | static int nvme_suspend_queue(struct nvme_queue *nvmeq) | |
b60503ba | 1192 | { |
4d115420 | 1193 | int vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; |
b60503ba | 1194 | |
a09115b2 | 1195 | spin_lock_irq(&nvmeq->q_lock); |
22404274 KB |
1196 | if (nvmeq->q_suspended) { |
1197 | spin_unlock_irq(&nvmeq->q_lock); | |
4d115420 | 1198 | return 1; |
3295874b | 1199 | } |
22404274 | 1200 | nvmeq->q_suspended = 1; |
42f61420 | 1201 | nvmeq->dev->online_queues--; |
a09115b2 MW |
1202 | spin_unlock_irq(&nvmeq->q_lock); |
1203 | ||
aba2080f MW |
1204 | irq_set_affinity_hint(vector, NULL); |
1205 | free_irq(vector, nvmeq); | |
b60503ba | 1206 | |
4d115420 KB |
1207 | return 0; |
1208 | } | |
b60503ba | 1209 | |
4d115420 KB |
1210 | static void nvme_clear_queue(struct nvme_queue *nvmeq) |
1211 | { | |
22404274 KB |
1212 | spin_lock_irq(&nvmeq->q_lock); |
1213 | nvme_process_cq(nvmeq); | |
1214 | nvme_cancel_ios(nvmeq, false); | |
1215 | spin_unlock_irq(&nvmeq->q_lock); | |
b60503ba MW |
1216 | } |
1217 | ||
4d115420 KB |
1218 | static void nvme_disable_queue(struct nvme_dev *dev, int qid) |
1219 | { | |
5a92e700 | 1220 | struct nvme_queue *nvmeq = raw_nvmeq(dev, qid); |
4d115420 KB |
1221 | |
1222 | if (!nvmeq) | |
1223 | return; | |
1224 | if (nvme_suspend_queue(nvmeq)) | |
1225 | return; | |
1226 | ||
0e53d180 KB |
1227 | /* Don't tell the adapter to delete the admin queue. |
1228 | * Don't tell a removed adapter to delete IO queues. */ | |
1229 | if (qid && readl(&dev->bar->csts) != -1) { | |
b60503ba MW |
1230 | adapter_delete_sq(dev, qid); |
1231 | adapter_delete_cq(dev, qid); | |
1232 | } | |
4d115420 | 1233 | nvme_clear_queue(nvmeq); |
b60503ba MW |
1234 | } |
1235 | ||
1236 | static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, | |
1237 | int depth, int vector) | |
1238 | { | |
1239 | struct device *dmadev = &dev->pci_dev->dev; | |
22404274 | 1240 | unsigned extra = nvme_queue_extra(depth); |
b60503ba MW |
1241 | struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL); |
1242 | if (!nvmeq) | |
1243 | return NULL; | |
1244 | ||
1245 | nvmeq->cqes = dma_alloc_coherent(dmadev, CQ_SIZE(depth), | |
1246 | &nvmeq->cq_dma_addr, GFP_KERNEL); | |
1247 | if (!nvmeq->cqes) | |
1248 | goto free_nvmeq; | |
1249 | memset((void *)nvmeq->cqes, 0, CQ_SIZE(depth)); | |
1250 | ||
1251 | nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth), | |
1252 | &nvmeq->sq_dma_addr, GFP_KERNEL); | |
1253 | if (!nvmeq->sq_cmds) | |
1254 | goto free_cqdma; | |
1255 | ||
42f61420 KB |
1256 | if (qid && !zalloc_cpumask_var(&nvmeq->cpu_mask, GFP_KERNEL)) |
1257 | goto free_sqdma; | |
1258 | ||
b60503ba | 1259 | nvmeq->q_dmadev = dmadev; |
091b6092 | 1260 | nvmeq->dev = dev; |
3193f07b MW |
1261 | snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", |
1262 | dev->instance, qid); | |
b60503ba MW |
1263 | spin_lock_init(&nvmeq->q_lock); |
1264 | nvmeq->cq_head = 0; | |
82123460 | 1265 | nvmeq->cq_phase = 1; |
b60503ba | 1266 | init_waitqueue_head(&nvmeq->sq_full); |
1fa6aead | 1267 | init_waitqueue_entry(&nvmeq->sq_cong_wait, nvme_thread); |
b60503ba | 1268 | bio_list_init(&nvmeq->sq_cong); |
edd10d33 | 1269 | INIT_LIST_HEAD(&nvmeq->iod_bio); |
b80d5ccc | 1270 | nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; |
b60503ba MW |
1271 | nvmeq->q_depth = depth; |
1272 | nvmeq->cq_vector = vector; | |
c30341dc | 1273 | nvmeq->qid = qid; |
22404274 KB |
1274 | nvmeq->q_suspended = 1; |
1275 | dev->queue_count++; | |
5a92e700 | 1276 | rcu_assign_pointer(dev->queues[qid], nvmeq); |
b60503ba MW |
1277 | |
1278 | return nvmeq; | |
1279 | ||
42f61420 KB |
1280 | free_sqdma: |
1281 | dma_free_coherent(dmadev, SQ_SIZE(depth), (void *)nvmeq->sq_cmds, | |
1282 | nvmeq->sq_dma_addr); | |
b60503ba | 1283 | free_cqdma: |
68b8eca5 | 1284 | dma_free_coherent(dmadev, CQ_SIZE(depth), (void *)nvmeq->cqes, |
b60503ba MW |
1285 | nvmeq->cq_dma_addr); |
1286 | free_nvmeq: | |
1287 | kfree(nvmeq); | |
1288 | return NULL; | |
1289 | } | |
1290 | ||
3001082c MW |
1291 | static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, |
1292 | const char *name) | |
1293 | { | |
58ffacb5 MW |
1294 | if (use_threaded_interrupts) |
1295 | return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, | |
481e5bad | 1296 | nvme_irq_check, nvme_irq, IRQF_SHARED, |
58ffacb5 | 1297 | name, nvmeq); |
3001082c | 1298 | return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, |
481e5bad | 1299 | IRQF_SHARED, name, nvmeq); |
3001082c MW |
1300 | } |
1301 | ||
22404274 | 1302 | static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) |
b60503ba | 1303 | { |
22404274 KB |
1304 | struct nvme_dev *dev = nvmeq->dev; |
1305 | unsigned extra = nvme_queue_extra(nvmeq->q_depth); | |
b60503ba | 1306 | |
22404274 KB |
1307 | nvmeq->sq_tail = 0; |
1308 | nvmeq->cq_head = 0; | |
1309 | nvmeq->cq_phase = 1; | |
b80d5ccc | 1310 | nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; |
22404274 KB |
1311 | memset(nvmeq->cmdid_data, 0, extra); |
1312 | memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); | |
1313 | nvme_cancel_ios(nvmeq, false); | |
1314 | nvmeq->q_suspended = 0; | |
42f61420 | 1315 | dev->online_queues++; |
22404274 KB |
1316 | } |
1317 | ||
1318 | static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) | |
1319 | { | |
1320 | struct nvme_dev *dev = nvmeq->dev; | |
1321 | int result; | |
3f85d50b | 1322 | |
b60503ba MW |
1323 | result = adapter_alloc_cq(dev, qid, nvmeq); |
1324 | if (result < 0) | |
22404274 | 1325 | return result; |
b60503ba MW |
1326 | |
1327 | result = adapter_alloc_sq(dev, qid, nvmeq); | |
1328 | if (result < 0) | |
1329 | goto release_cq; | |
1330 | ||
3193f07b | 1331 | result = queue_request_irq(dev, nvmeq, nvmeq->irqname); |
b60503ba MW |
1332 | if (result < 0) |
1333 | goto release_sq; | |
1334 | ||
0a8d44cb | 1335 | spin_lock_irq(&nvmeq->q_lock); |
22404274 | 1336 | nvme_init_queue(nvmeq, qid); |
0a8d44cb | 1337 | spin_unlock_irq(&nvmeq->q_lock); |
22404274 KB |
1338 | |
1339 | return result; | |
b60503ba MW |
1340 | |
1341 | release_sq: | |
1342 | adapter_delete_sq(dev, qid); | |
1343 | release_cq: | |
1344 | adapter_delete_cq(dev, qid); | |
22404274 | 1345 | return result; |
b60503ba MW |
1346 | } |
1347 | ||
ba47e386 MW |
1348 | static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled) |
1349 | { | |
1350 | unsigned long timeout; | |
1351 | u32 bit = enabled ? NVME_CSTS_RDY : 0; | |
1352 | ||
1353 | timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; | |
1354 | ||
1355 | while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) { | |
1356 | msleep(100); | |
1357 | if (fatal_signal_pending(current)) | |
1358 | return -EINTR; | |
1359 | if (time_after(jiffies, timeout)) { | |
1360 | dev_err(&dev->pci_dev->dev, | |
1361 | "Device not ready; aborting initialisation\n"); | |
1362 | return -ENODEV; | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | /* | |
1370 | * If the device has been passed off to us in an enabled state, just clear | |
1371 | * the enabled bit. The spec says we should set the 'shutdown notification | |
1372 | * bits', but doing so may cause the device to complete commands to the | |
1373 | * admin queue ... and we don't know what memory that might be pointing at! | |
1374 | */ | |
1375 | static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap) | |
1376 | { | |
44af146a MW |
1377 | u32 cc = readl(&dev->bar->cc); |
1378 | ||
1379 | if (cc & NVME_CC_ENABLE) | |
1380 | writel(cc & ~NVME_CC_ENABLE, &dev->bar->cc); | |
ba47e386 MW |
1381 | return nvme_wait_ready(dev, cap, false); |
1382 | } | |
1383 | ||
1384 | static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap) | |
1385 | { | |
1386 | return nvme_wait_ready(dev, cap, true); | |
1387 | } | |
1388 | ||
1894d8f1 KB |
1389 | static int nvme_shutdown_ctrl(struct nvme_dev *dev) |
1390 | { | |
1391 | unsigned long timeout; | |
1392 | u32 cc; | |
1393 | ||
1394 | cc = (readl(&dev->bar->cc) & ~NVME_CC_SHN_MASK) | NVME_CC_SHN_NORMAL; | |
1395 | writel(cc, &dev->bar->cc); | |
1396 | ||
1397 | timeout = 2 * HZ + jiffies; | |
1398 | while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) != | |
1399 | NVME_CSTS_SHST_CMPLT) { | |
1400 | msleep(100); | |
1401 | if (fatal_signal_pending(current)) | |
1402 | return -EINTR; | |
1403 | if (time_after(jiffies, timeout)) { | |
1404 | dev_err(&dev->pci_dev->dev, | |
1405 | "Device shutdown incomplete; abort shutdown\n"); | |
1406 | return -ENODEV; | |
1407 | } | |
1408 | } | |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | ||
8d85fce7 | 1413 | static int nvme_configure_admin_queue(struct nvme_dev *dev) |
b60503ba | 1414 | { |
ba47e386 | 1415 | int result; |
b60503ba | 1416 | u32 aqa; |
ba47e386 | 1417 | u64 cap = readq(&dev->bar->cap); |
b60503ba MW |
1418 | struct nvme_queue *nvmeq; |
1419 | ||
ba47e386 MW |
1420 | result = nvme_disable_ctrl(dev, cap); |
1421 | if (result < 0) | |
1422 | return result; | |
b60503ba | 1423 | |
5a92e700 | 1424 | nvmeq = raw_nvmeq(dev, 0); |
cd638946 KB |
1425 | if (!nvmeq) { |
1426 | nvmeq = nvme_alloc_queue(dev, 0, 64, 0); | |
1427 | if (!nvmeq) | |
1428 | return -ENOMEM; | |
cd638946 | 1429 | } |
b60503ba MW |
1430 | |
1431 | aqa = nvmeq->q_depth - 1; | |
1432 | aqa |= aqa << 16; | |
1433 | ||
1434 | dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM; | |
1435 | dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT; | |
1436 | dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; | |
7f53f9d2 | 1437 | dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; |
b60503ba MW |
1438 | |
1439 | writel(aqa, &dev->bar->aqa); | |
1440 | writeq(nvmeq->sq_dma_addr, &dev->bar->asq); | |
1441 | writeq(nvmeq->cq_dma_addr, &dev->bar->acq); | |
1442 | writel(dev->ctrl_config, &dev->bar->cc); | |
1443 | ||
ba47e386 | 1444 | result = nvme_enable_ctrl(dev, cap); |
025c557a | 1445 | if (result) |
cd638946 | 1446 | return result; |
9e866774 | 1447 | |
3193f07b | 1448 | result = queue_request_irq(dev, nvmeq, nvmeq->irqname); |
025c557a | 1449 | if (result) |
cd638946 | 1450 | return result; |
025c557a | 1451 | |
0a8d44cb | 1452 | spin_lock_irq(&nvmeq->q_lock); |
22404274 | 1453 | nvme_init_queue(nvmeq, 0); |
0a8d44cb | 1454 | spin_unlock_irq(&nvmeq->q_lock); |
b60503ba MW |
1455 | return result; |
1456 | } | |
1457 | ||
5d0f6131 | 1458 | struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write, |
eca18b23 | 1459 | unsigned long addr, unsigned length) |
b60503ba | 1460 | { |
36c14ed9 | 1461 | int i, err, count, nents, offset; |
7fc3cdab MW |
1462 | struct scatterlist *sg; |
1463 | struct page **pages; | |
eca18b23 | 1464 | struct nvme_iod *iod; |
36c14ed9 MW |
1465 | |
1466 | if (addr & 3) | |
eca18b23 | 1467 | return ERR_PTR(-EINVAL); |
5460fc03 | 1468 | if (!length || length > INT_MAX - PAGE_SIZE) |
eca18b23 | 1469 | return ERR_PTR(-EINVAL); |
7fc3cdab | 1470 | |
36c14ed9 | 1471 | offset = offset_in_page(addr); |
7fc3cdab MW |
1472 | count = DIV_ROUND_UP(offset + length, PAGE_SIZE); |
1473 | pages = kcalloc(count, sizeof(*pages), GFP_KERNEL); | |
22fff826 DC |
1474 | if (!pages) |
1475 | return ERR_PTR(-ENOMEM); | |
36c14ed9 MW |
1476 | |
1477 | err = get_user_pages_fast(addr, count, 1, pages); | |
1478 | if (err < count) { | |
1479 | count = err; | |
1480 | err = -EFAULT; | |
1481 | goto put_pages; | |
1482 | } | |
7fc3cdab | 1483 | |
eca18b23 MW |
1484 | iod = nvme_alloc_iod(count, length, GFP_KERNEL); |
1485 | sg = iod->sg; | |
36c14ed9 | 1486 | sg_init_table(sg, count); |
d0ba1e49 MW |
1487 | for (i = 0; i < count; i++) { |
1488 | sg_set_page(&sg[i], pages[i], | |
5460fc03 DC |
1489 | min_t(unsigned, length, PAGE_SIZE - offset), |
1490 | offset); | |
d0ba1e49 MW |
1491 | length -= (PAGE_SIZE - offset); |
1492 | offset = 0; | |
7fc3cdab | 1493 | } |
fe304c43 | 1494 | sg_mark_end(&sg[i - 1]); |
1c2ad9fa | 1495 | iod->nents = count; |
7fc3cdab MW |
1496 | |
1497 | err = -ENOMEM; | |
1498 | nents = dma_map_sg(&dev->pci_dev->dev, sg, count, | |
1499 | write ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
36c14ed9 | 1500 | if (!nents) |
eca18b23 | 1501 | goto free_iod; |
b60503ba | 1502 | |
7fc3cdab | 1503 | kfree(pages); |
eca18b23 | 1504 | return iod; |
b60503ba | 1505 | |
eca18b23 MW |
1506 | free_iod: |
1507 | kfree(iod); | |
7fc3cdab MW |
1508 | put_pages: |
1509 | for (i = 0; i < count; i++) | |
1510 | put_page(pages[i]); | |
1511 | kfree(pages); | |
eca18b23 | 1512 | return ERR_PTR(err); |
7fc3cdab | 1513 | } |
b60503ba | 1514 | |
5d0f6131 | 1515 | void nvme_unmap_user_pages(struct nvme_dev *dev, int write, |
1c2ad9fa | 1516 | struct nvme_iod *iod) |
7fc3cdab | 1517 | { |
1c2ad9fa | 1518 | int i; |
b60503ba | 1519 | |
1c2ad9fa MW |
1520 | dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents, |
1521 | write ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
7fc3cdab | 1522 | |
1c2ad9fa MW |
1523 | for (i = 0; i < iod->nents; i++) |
1524 | put_page(sg_page(&iod->sg[i])); | |
7fc3cdab | 1525 | } |
b60503ba | 1526 | |
a53295b6 MW |
1527 | static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) |
1528 | { | |
1529 | struct nvme_dev *dev = ns->dev; | |
a53295b6 MW |
1530 | struct nvme_user_io io; |
1531 | struct nvme_command c; | |
f410c680 KB |
1532 | unsigned length, meta_len; |
1533 | int status, i; | |
1534 | struct nvme_iod *iod, *meta_iod = NULL; | |
1535 | dma_addr_t meta_dma_addr; | |
1536 | void *meta, *uninitialized_var(meta_mem); | |
a53295b6 MW |
1537 | |
1538 | if (copy_from_user(&io, uio, sizeof(io))) | |
1539 | return -EFAULT; | |
6c7d4945 | 1540 | length = (io.nblocks + 1) << ns->lba_shift; |
f410c680 KB |
1541 | meta_len = (io.nblocks + 1) * ns->ms; |
1542 | ||
1543 | if (meta_len && ((io.metadata & 3) || !io.metadata)) | |
1544 | return -EINVAL; | |
6c7d4945 MW |
1545 | |
1546 | switch (io.opcode) { | |
1547 | case nvme_cmd_write: | |
1548 | case nvme_cmd_read: | |
6bbf1acd | 1549 | case nvme_cmd_compare: |
eca18b23 | 1550 | iod = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length); |
6413214c | 1551 | break; |
6c7d4945 | 1552 | default: |
6bbf1acd | 1553 | return -EINVAL; |
6c7d4945 MW |
1554 | } |
1555 | ||
eca18b23 MW |
1556 | if (IS_ERR(iod)) |
1557 | return PTR_ERR(iod); | |
a53295b6 MW |
1558 | |
1559 | memset(&c, 0, sizeof(c)); | |
1560 | c.rw.opcode = io.opcode; | |
1561 | c.rw.flags = io.flags; | |
6c7d4945 | 1562 | c.rw.nsid = cpu_to_le32(ns->ns_id); |
a53295b6 | 1563 | c.rw.slba = cpu_to_le64(io.slba); |
6c7d4945 | 1564 | c.rw.length = cpu_to_le16(io.nblocks); |
a53295b6 | 1565 | c.rw.control = cpu_to_le16(io.control); |
1c9b5265 MW |
1566 | c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); |
1567 | c.rw.reftag = cpu_to_le32(io.reftag); | |
1568 | c.rw.apptag = cpu_to_le16(io.apptag); | |
1569 | c.rw.appmask = cpu_to_le16(io.appmask); | |
f410c680 KB |
1570 | |
1571 | if (meta_len) { | |
1b56749e KB |
1572 | meta_iod = nvme_map_user_pages(dev, io.opcode & 1, io.metadata, |
1573 | meta_len); | |
f410c680 KB |
1574 | if (IS_ERR(meta_iod)) { |
1575 | status = PTR_ERR(meta_iod); | |
1576 | meta_iod = NULL; | |
1577 | goto unmap; | |
1578 | } | |
1579 | ||
1580 | meta_mem = dma_alloc_coherent(&dev->pci_dev->dev, meta_len, | |
1581 | &meta_dma_addr, GFP_KERNEL); | |
1582 | if (!meta_mem) { | |
1583 | status = -ENOMEM; | |
1584 | goto unmap; | |
1585 | } | |
1586 | ||
1587 | if (io.opcode & 1) { | |
1588 | int meta_offset = 0; | |
1589 | ||
1590 | for (i = 0; i < meta_iod->nents; i++) { | |
1591 | meta = kmap_atomic(sg_page(&meta_iod->sg[i])) + | |
1592 | meta_iod->sg[i].offset; | |
1593 | memcpy(meta_mem + meta_offset, meta, | |
1594 | meta_iod->sg[i].length); | |
1595 | kunmap_atomic(meta); | |
1596 | meta_offset += meta_iod->sg[i].length; | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | c.rw.metadata = cpu_to_le64(meta_dma_addr); | |
1601 | } | |
1602 | ||
edd10d33 KB |
1603 | length = nvme_setup_prps(dev, iod, length, GFP_KERNEL); |
1604 | c.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); | |
1605 | c.rw.prp2 = cpu_to_le64(iod->first_dma); | |
a53295b6 | 1606 | |
b77954cb MW |
1607 | if (length != (io.nblocks + 1) << ns->lba_shift) |
1608 | status = -ENOMEM; | |
1609 | else | |
4f5099af | 1610 | status = nvme_submit_io_cmd(dev, &c, NULL); |
a53295b6 | 1611 | |
f410c680 KB |
1612 | if (meta_len) { |
1613 | if (status == NVME_SC_SUCCESS && !(io.opcode & 1)) { | |
1614 | int meta_offset = 0; | |
1615 | ||
1616 | for (i = 0; i < meta_iod->nents; i++) { | |
1617 | meta = kmap_atomic(sg_page(&meta_iod->sg[i])) + | |
1618 | meta_iod->sg[i].offset; | |
1619 | memcpy(meta, meta_mem + meta_offset, | |
1620 | meta_iod->sg[i].length); | |
1621 | kunmap_atomic(meta); | |
1622 | meta_offset += meta_iod->sg[i].length; | |
1623 | } | |
1624 | } | |
1625 | ||
1626 | dma_free_coherent(&dev->pci_dev->dev, meta_len, meta_mem, | |
1627 | meta_dma_addr); | |
1628 | } | |
1629 | ||
1630 | unmap: | |
1c2ad9fa | 1631 | nvme_unmap_user_pages(dev, io.opcode & 1, iod); |
eca18b23 | 1632 | nvme_free_iod(dev, iod); |
f410c680 KB |
1633 | |
1634 | if (meta_iod) { | |
1635 | nvme_unmap_user_pages(dev, io.opcode & 1, meta_iod); | |
1636 | nvme_free_iod(dev, meta_iod); | |
1637 | } | |
1638 | ||
a53295b6 MW |
1639 | return status; |
1640 | } | |
1641 | ||
50af8bae | 1642 | static int nvme_user_admin_cmd(struct nvme_dev *dev, |
6bbf1acd | 1643 | struct nvme_admin_cmd __user *ucmd) |
6ee44cdc | 1644 | { |
6bbf1acd | 1645 | struct nvme_admin_cmd cmd; |
6ee44cdc | 1646 | struct nvme_command c; |
eca18b23 | 1647 | int status, length; |
c7d36ab8 | 1648 | struct nvme_iod *uninitialized_var(iod); |
94f370ca | 1649 | unsigned timeout; |
6ee44cdc | 1650 | |
6bbf1acd MW |
1651 | if (!capable(CAP_SYS_ADMIN)) |
1652 | return -EACCES; | |
1653 | if (copy_from_user(&cmd, ucmd, sizeof(cmd))) | |
6ee44cdc | 1654 | return -EFAULT; |
6ee44cdc MW |
1655 | |
1656 | memset(&c, 0, sizeof(c)); | |
6bbf1acd MW |
1657 | c.common.opcode = cmd.opcode; |
1658 | c.common.flags = cmd.flags; | |
1659 | c.common.nsid = cpu_to_le32(cmd.nsid); | |
1660 | c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); | |
1661 | c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); | |
1662 | c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); | |
1663 | c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); | |
1664 | c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); | |
1665 | c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); | |
1666 | c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); | |
1667 | c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); | |
1668 | ||
1669 | length = cmd.data_len; | |
1670 | if (cmd.data_len) { | |
49742188 MW |
1671 | iod = nvme_map_user_pages(dev, cmd.opcode & 1, cmd.addr, |
1672 | length); | |
eca18b23 MW |
1673 | if (IS_ERR(iod)) |
1674 | return PTR_ERR(iod); | |
edd10d33 KB |
1675 | length = nvme_setup_prps(dev, iod, length, GFP_KERNEL); |
1676 | c.common.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); | |
1677 | c.common.prp2 = cpu_to_le64(iod->first_dma); | |
6bbf1acd MW |
1678 | } |
1679 | ||
94f370ca KB |
1680 | timeout = cmd.timeout_ms ? msecs_to_jiffies(cmd.timeout_ms) : |
1681 | ADMIN_TIMEOUT; | |
6bbf1acd | 1682 | if (length != cmd.data_len) |
b77954cb MW |
1683 | status = -ENOMEM; |
1684 | else | |
4f5099af | 1685 | status = nvme_submit_sync_cmd(dev, 0, &c, &cmd.result, timeout); |
eca18b23 | 1686 | |
6bbf1acd | 1687 | if (cmd.data_len) { |
1c2ad9fa | 1688 | nvme_unmap_user_pages(dev, cmd.opcode & 1, iod); |
eca18b23 | 1689 | nvme_free_iod(dev, iod); |
6bbf1acd | 1690 | } |
f4f117f6 | 1691 | |
cf90bc48 | 1692 | if ((status >= 0) && copy_to_user(&ucmd->result, &cmd.result, |
f4f117f6 KB |
1693 | sizeof(cmd.result))) |
1694 | status = -EFAULT; | |
1695 | ||
6ee44cdc MW |
1696 | return status; |
1697 | } | |
1698 | ||
b60503ba MW |
1699 | static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, |
1700 | unsigned long arg) | |
1701 | { | |
1702 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
1703 | ||
1704 | switch (cmd) { | |
6bbf1acd | 1705 | case NVME_IOCTL_ID: |
c3bfe717 | 1706 | force_successful_syscall_return(); |
6bbf1acd MW |
1707 | return ns->ns_id; |
1708 | case NVME_IOCTL_ADMIN_CMD: | |
50af8bae | 1709 | return nvme_user_admin_cmd(ns->dev, (void __user *)arg); |
a53295b6 MW |
1710 | case NVME_IOCTL_SUBMIT_IO: |
1711 | return nvme_submit_io(ns, (void __user *)arg); | |
5d0f6131 VV |
1712 | case SG_GET_VERSION_NUM: |
1713 | return nvme_sg_get_version_num((void __user *)arg); | |
1714 | case SG_IO: | |
1715 | return nvme_sg_io(ns, (void __user *)arg); | |
b60503ba MW |
1716 | default: |
1717 | return -ENOTTY; | |
1718 | } | |
1719 | } | |
1720 | ||
320a3827 KB |
1721 | #ifdef CONFIG_COMPAT |
1722 | static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
1723 | unsigned int cmd, unsigned long arg) | |
1724 | { | |
1725 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
1726 | ||
1727 | switch (cmd) { | |
1728 | case SG_IO: | |
1729 | return nvme_sg_io32(ns, arg); | |
1730 | } | |
1731 | return nvme_ioctl(bdev, mode, cmd, arg); | |
1732 | } | |
1733 | #else | |
1734 | #define nvme_compat_ioctl NULL | |
1735 | #endif | |
1736 | ||
9ac27090 KB |
1737 | static int nvme_open(struct block_device *bdev, fmode_t mode) |
1738 | { | |
1739 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
1740 | struct nvme_dev *dev = ns->dev; | |
1741 | ||
1742 | kref_get(&dev->kref); | |
1743 | return 0; | |
1744 | } | |
1745 | ||
1746 | static void nvme_free_dev(struct kref *kref); | |
1747 | ||
1748 | static void nvme_release(struct gendisk *disk, fmode_t mode) | |
1749 | { | |
1750 | struct nvme_ns *ns = disk->private_data; | |
1751 | struct nvme_dev *dev = ns->dev; | |
1752 | ||
1753 | kref_put(&dev->kref, nvme_free_dev); | |
1754 | } | |
1755 | ||
4cc09e2d KB |
1756 | static int nvme_getgeo(struct block_device *bd, struct hd_geometry *geo) |
1757 | { | |
1758 | /* some standard values */ | |
1759 | geo->heads = 1 << 6; | |
1760 | geo->sectors = 1 << 5; | |
1761 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
1762 | return 0; | |
1763 | } | |
1764 | ||
b60503ba MW |
1765 | static const struct block_device_operations nvme_fops = { |
1766 | .owner = THIS_MODULE, | |
1767 | .ioctl = nvme_ioctl, | |
320a3827 | 1768 | .compat_ioctl = nvme_compat_ioctl, |
9ac27090 KB |
1769 | .open = nvme_open, |
1770 | .release = nvme_release, | |
4cc09e2d | 1771 | .getgeo = nvme_getgeo, |
b60503ba MW |
1772 | }; |
1773 | ||
edd10d33 KB |
1774 | static void nvme_resubmit_iods(struct nvme_queue *nvmeq) |
1775 | { | |
1776 | struct nvme_iod *iod, *next; | |
1777 | ||
1778 | list_for_each_entry_safe(iod, next, &nvmeq->iod_bio, node) { | |
1779 | if (unlikely(nvme_submit_iod(nvmeq, iod))) | |
1780 | break; | |
1781 | list_del(&iod->node); | |
1782 | if (bio_list_empty(&nvmeq->sq_cong) && | |
1783 | list_empty(&nvmeq->iod_bio)) | |
1784 | remove_wait_queue(&nvmeq->sq_full, | |
1785 | &nvmeq->sq_cong_wait); | |
1786 | } | |
1787 | } | |
1788 | ||
1fa6aead MW |
1789 | static void nvme_resubmit_bios(struct nvme_queue *nvmeq) |
1790 | { | |
1791 | while (bio_list_peek(&nvmeq->sq_cong)) { | |
1792 | struct bio *bio = bio_list_pop(&nvmeq->sq_cong); | |
1793 | struct nvme_ns *ns = bio->bi_bdev->bd_disk->private_data; | |
427e9708 | 1794 | |
edd10d33 KB |
1795 | if (bio_list_empty(&nvmeq->sq_cong) && |
1796 | list_empty(&nvmeq->iod_bio)) | |
427e9708 KB |
1797 | remove_wait_queue(&nvmeq->sq_full, |
1798 | &nvmeq->sq_cong_wait); | |
1fa6aead | 1799 | if (nvme_submit_bio_queue(nvmeq, ns, bio)) { |
edd10d33 | 1800 | if (!waitqueue_active(&nvmeq->sq_full)) |
427e9708 KB |
1801 | add_wait_queue(&nvmeq->sq_full, |
1802 | &nvmeq->sq_cong_wait); | |
1fa6aead MW |
1803 | bio_list_add_head(&nvmeq->sq_cong, bio); |
1804 | break; | |
1805 | } | |
1806 | } | |
1807 | } | |
1808 | ||
1809 | static int nvme_kthread(void *data) | |
1810 | { | |
d4b4ff8e | 1811 | struct nvme_dev *dev, *next; |
1fa6aead MW |
1812 | |
1813 | while (!kthread_should_stop()) { | |
564a232c | 1814 | set_current_state(TASK_INTERRUPTIBLE); |
1fa6aead | 1815 | spin_lock(&dev_list_lock); |
d4b4ff8e | 1816 | list_for_each_entry_safe(dev, next, &dev_list, node) { |
1fa6aead | 1817 | int i; |
d4b4ff8e KB |
1818 | if (readl(&dev->bar->csts) & NVME_CSTS_CFS && |
1819 | dev->initialized) { | |
1820 | if (work_busy(&dev->reset_work)) | |
1821 | continue; | |
1822 | list_del_init(&dev->node); | |
1823 | dev_warn(&dev->pci_dev->dev, | |
1824 | "Failed status, reset controller\n"); | |
9ca97374 | 1825 | dev->reset_workfn = nvme_reset_failed_dev; |
d4b4ff8e KB |
1826 | queue_work(nvme_workq, &dev->reset_work); |
1827 | continue; | |
1828 | } | |
5a92e700 | 1829 | rcu_read_lock(); |
1fa6aead | 1830 | for (i = 0; i < dev->queue_count; i++) { |
5a92e700 KB |
1831 | struct nvme_queue *nvmeq = |
1832 | rcu_dereference(dev->queues[i]); | |
740216fc MW |
1833 | if (!nvmeq) |
1834 | continue; | |
1fa6aead | 1835 | spin_lock_irq(&nvmeq->q_lock); |
22404274 KB |
1836 | if (nvmeq->q_suspended) |
1837 | goto unlock; | |
bc57a0f7 | 1838 | nvme_process_cq(nvmeq); |
a09115b2 | 1839 | nvme_cancel_ios(nvmeq, true); |
1fa6aead | 1840 | nvme_resubmit_bios(nvmeq); |
edd10d33 | 1841 | nvme_resubmit_iods(nvmeq); |
22404274 | 1842 | unlock: |
1fa6aead MW |
1843 | spin_unlock_irq(&nvmeq->q_lock); |
1844 | } | |
5a92e700 | 1845 | rcu_read_unlock(); |
1fa6aead MW |
1846 | } |
1847 | spin_unlock(&dev_list_lock); | |
acb7aa0d | 1848 | schedule_timeout(round_jiffies_relative(HZ)); |
1fa6aead MW |
1849 | } |
1850 | return 0; | |
1851 | } | |
1852 | ||
0e5e4f0e KB |
1853 | static void nvme_config_discard(struct nvme_ns *ns) |
1854 | { | |
1855 | u32 logical_block_size = queue_logical_block_size(ns->queue); | |
1856 | ns->queue->limits.discard_zeroes_data = 0; | |
1857 | ns->queue->limits.discard_alignment = logical_block_size; | |
1858 | ns->queue->limits.discard_granularity = logical_block_size; | |
1859 | ns->queue->limits.max_discard_sectors = 0xffffffff; | |
1860 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); | |
1861 | } | |
1862 | ||
c3bfe717 | 1863 | static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid, |
b60503ba MW |
1864 | struct nvme_id_ns *id, struct nvme_lba_range_type *rt) |
1865 | { | |
1866 | struct nvme_ns *ns; | |
1867 | struct gendisk *disk; | |
1868 | int lbaf; | |
1869 | ||
1870 | if (rt->attributes & NVME_LBART_ATTRIB_HIDE) | |
1871 | return NULL; | |
1872 | ||
1873 | ns = kzalloc(sizeof(*ns), GFP_KERNEL); | |
1874 | if (!ns) | |
1875 | return NULL; | |
1876 | ns->queue = blk_alloc_queue(GFP_KERNEL); | |
1877 | if (!ns->queue) | |
1878 | goto out_free_ns; | |
4eeb9215 MW |
1879 | ns->queue->queue_flags = QUEUE_FLAG_DEFAULT; |
1880 | queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); | |
1881 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); | |
b60503ba MW |
1882 | blk_queue_make_request(ns->queue, nvme_make_request); |
1883 | ns->dev = dev; | |
1884 | ns->queue->queuedata = ns; | |
1885 | ||
469071a3 | 1886 | disk = alloc_disk(0); |
b60503ba MW |
1887 | if (!disk) |
1888 | goto out_free_queue; | |
5aff9382 | 1889 | ns->ns_id = nsid; |
b60503ba MW |
1890 | ns->disk = disk; |
1891 | lbaf = id->flbas & 0xf; | |
1892 | ns->lba_shift = id->lbaf[lbaf].ds; | |
f410c680 | 1893 | ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); |
e9ef4636 | 1894 | blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); |
8fc23e03 KB |
1895 | if (dev->max_hw_sectors) |
1896 | blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors); | |
b60503ba MW |
1897 | |
1898 | disk->major = nvme_major; | |
469071a3 | 1899 | disk->first_minor = 0; |
b60503ba MW |
1900 | disk->fops = &nvme_fops; |
1901 | disk->private_data = ns; | |
1902 | disk->queue = ns->queue; | |
388f037f | 1903 | disk->driverfs_dev = &dev->pci_dev->dev; |
469071a3 | 1904 | disk->flags = GENHD_FL_EXT_DEVT; |
5aff9382 | 1905 | sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid); |
b60503ba MW |
1906 | set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); |
1907 | ||
0e5e4f0e KB |
1908 | if (dev->oncs & NVME_CTRL_ONCS_DSM) |
1909 | nvme_config_discard(ns); | |
1910 | ||
b60503ba MW |
1911 | return ns; |
1912 | ||
1913 | out_free_queue: | |
1914 | blk_cleanup_queue(ns->queue); | |
1915 | out_free_ns: | |
1916 | kfree(ns); | |
1917 | return NULL; | |
1918 | } | |
1919 | ||
42f61420 KB |
1920 | static int nvme_find_closest_node(int node) |
1921 | { | |
1922 | int n, val, min_val = INT_MAX, best_node = node; | |
1923 | ||
1924 | for_each_online_node(n) { | |
1925 | if (n == node) | |
1926 | continue; | |
1927 | val = node_distance(node, n); | |
1928 | if (val < min_val) { | |
1929 | min_val = val; | |
1930 | best_node = n; | |
1931 | } | |
1932 | } | |
1933 | return best_node; | |
1934 | } | |
1935 | ||
1936 | static void nvme_set_queue_cpus(cpumask_t *qmask, struct nvme_queue *nvmeq, | |
1937 | int count) | |
1938 | { | |
1939 | int cpu; | |
1940 | for_each_cpu(cpu, qmask) { | |
1941 | if (cpumask_weight(nvmeq->cpu_mask) >= count) | |
1942 | break; | |
1943 | if (!cpumask_test_and_set_cpu(cpu, nvmeq->cpu_mask)) | |
1944 | *per_cpu_ptr(nvmeq->dev->io_queue, cpu) = nvmeq->qid; | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | static void nvme_add_cpus(cpumask_t *mask, const cpumask_t *unassigned_cpus, | |
1949 | const cpumask_t *new_mask, struct nvme_queue *nvmeq, int cpus_per_queue) | |
1950 | { | |
1951 | int next_cpu; | |
1952 | for_each_cpu(next_cpu, new_mask) { | |
1953 | cpumask_or(mask, mask, get_cpu_mask(next_cpu)); | |
1954 | cpumask_or(mask, mask, topology_thread_cpumask(next_cpu)); | |
1955 | cpumask_and(mask, mask, unassigned_cpus); | |
1956 | nvme_set_queue_cpus(mask, nvmeq, cpus_per_queue); | |
1957 | } | |
1958 | } | |
1959 | ||
1960 | static void nvme_create_io_queues(struct nvme_dev *dev) | |
1961 | { | |
1962 | unsigned i, max; | |
1963 | ||
1964 | max = min(dev->max_qid, num_online_cpus()); | |
1965 | for (i = dev->queue_count; i <= max; i++) | |
1966 | if (!nvme_alloc_queue(dev, i, dev->q_depth, i - 1)) | |
1967 | break; | |
1968 | ||
1969 | max = min(dev->queue_count - 1, num_online_cpus()); | |
1970 | for (i = dev->online_queues; i <= max; i++) | |
1971 | if (nvme_create_queue(raw_nvmeq(dev, i), i)) | |
1972 | break; | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * If there are fewer queues than online cpus, this will try to optimally | |
1977 | * assign a queue to multiple cpus by grouping cpus that are "close" together: | |
1978 | * thread siblings, core, socket, closest node, then whatever else is | |
1979 | * available. | |
1980 | */ | |
1981 | static void nvme_assign_io_queues(struct nvme_dev *dev) | |
1982 | { | |
1983 | unsigned cpu, cpus_per_queue, queues, remainder, i; | |
1984 | cpumask_var_t unassigned_cpus; | |
1985 | ||
1986 | nvme_create_io_queues(dev); | |
1987 | ||
1988 | queues = min(dev->online_queues - 1, num_online_cpus()); | |
1989 | if (!queues) | |
1990 | return; | |
1991 | ||
1992 | cpus_per_queue = num_online_cpus() / queues; | |
1993 | remainder = queues - (num_online_cpus() - queues * cpus_per_queue); | |
1994 | ||
1995 | if (!alloc_cpumask_var(&unassigned_cpus, GFP_KERNEL)) | |
1996 | return; | |
1997 | ||
1998 | cpumask_copy(unassigned_cpus, cpu_online_mask); | |
1999 | cpu = cpumask_first(unassigned_cpus); | |
2000 | for (i = 1; i <= queues; i++) { | |
2001 | struct nvme_queue *nvmeq = lock_nvmeq(dev, i); | |
2002 | cpumask_t mask; | |
2003 | ||
2004 | cpumask_clear(nvmeq->cpu_mask); | |
2005 | if (!cpumask_weight(unassigned_cpus)) { | |
2006 | unlock_nvmeq(nvmeq); | |
2007 | break; | |
2008 | } | |
2009 | ||
2010 | mask = *get_cpu_mask(cpu); | |
2011 | nvme_set_queue_cpus(&mask, nvmeq, cpus_per_queue); | |
2012 | if (cpus_weight(mask) < cpus_per_queue) | |
2013 | nvme_add_cpus(&mask, unassigned_cpus, | |
2014 | topology_thread_cpumask(cpu), | |
2015 | nvmeq, cpus_per_queue); | |
2016 | if (cpus_weight(mask) < cpus_per_queue) | |
2017 | nvme_add_cpus(&mask, unassigned_cpus, | |
2018 | topology_core_cpumask(cpu), | |
2019 | nvmeq, cpus_per_queue); | |
2020 | if (cpus_weight(mask) < cpus_per_queue) | |
2021 | nvme_add_cpus(&mask, unassigned_cpus, | |
2022 | cpumask_of_node(cpu_to_node(cpu)), | |
2023 | nvmeq, cpus_per_queue); | |
2024 | if (cpus_weight(mask) < cpus_per_queue) | |
2025 | nvme_add_cpus(&mask, unassigned_cpus, | |
2026 | cpumask_of_node( | |
2027 | nvme_find_closest_node( | |
2028 | cpu_to_node(cpu))), | |
2029 | nvmeq, cpus_per_queue); | |
2030 | if (cpus_weight(mask) < cpus_per_queue) | |
2031 | nvme_add_cpus(&mask, unassigned_cpus, | |
2032 | unassigned_cpus, | |
2033 | nvmeq, cpus_per_queue); | |
2034 | ||
2035 | WARN(cpumask_weight(nvmeq->cpu_mask) != cpus_per_queue, | |
2036 | "nvme%d qid:%d mis-matched queue-to-cpu assignment\n", | |
2037 | dev->instance, i); | |
2038 | ||
2039 | irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, | |
2040 | nvmeq->cpu_mask); | |
2041 | cpumask_andnot(unassigned_cpus, unassigned_cpus, | |
2042 | nvmeq->cpu_mask); | |
2043 | cpu = cpumask_next(cpu, unassigned_cpus); | |
2044 | if (remainder && !--remainder) | |
2045 | cpus_per_queue++; | |
2046 | unlock_nvmeq(nvmeq); | |
2047 | } | |
2048 | WARN(cpumask_weight(unassigned_cpus), "nvme%d unassigned online cpus\n", | |
2049 | dev->instance); | |
2050 | i = 0; | |
2051 | cpumask_andnot(unassigned_cpus, cpu_possible_mask, cpu_online_mask); | |
2052 | for_each_cpu(cpu, unassigned_cpus) | |
2053 | *per_cpu_ptr(dev->io_queue, cpu) = (i++ % queues) + 1; | |
2054 | free_cpumask_var(unassigned_cpus); | |
2055 | } | |
2056 | ||
b3b06812 | 2057 | static int set_queue_count(struct nvme_dev *dev, int count) |
b60503ba MW |
2058 | { |
2059 | int status; | |
2060 | u32 result; | |
b3b06812 | 2061 | u32 q_count = (count - 1) | ((count - 1) << 16); |
b60503ba | 2062 | |
df348139 | 2063 | status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0, |
bc5fc7e4 | 2064 | &result); |
b60503ba | 2065 | if (status) |
7e03b124 | 2066 | return status < 0 ? -EIO : -EBUSY; |
b60503ba MW |
2067 | return min(result & 0xffff, result >> 16) + 1; |
2068 | } | |
2069 | ||
9d713c2b KB |
2070 | static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) |
2071 | { | |
b80d5ccc | 2072 | return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); |
9d713c2b KB |
2073 | } |
2074 | ||
33b1e95c KB |
2075 | static int nvme_cpu_notify(struct notifier_block *self, |
2076 | unsigned long action, void *hcpu) | |
2077 | { | |
2078 | struct nvme_dev *dev = container_of(self, struct nvme_dev, nb); | |
2079 | switch (action) { | |
2080 | case CPU_ONLINE: | |
2081 | case CPU_DEAD: | |
2082 | nvme_assign_io_queues(dev); | |
2083 | break; | |
2084 | } | |
2085 | return NOTIFY_OK; | |
2086 | } | |
2087 | ||
8d85fce7 | 2088 | static int nvme_setup_io_queues(struct nvme_dev *dev) |
b60503ba | 2089 | { |
5a92e700 | 2090 | struct nvme_queue *adminq = raw_nvmeq(dev, 0); |
fa08a396 | 2091 | struct pci_dev *pdev = dev->pci_dev; |
42f61420 | 2092 | int result, i, vecs, nr_io_queues, size; |
b60503ba | 2093 | |
42f61420 | 2094 | nr_io_queues = num_possible_cpus(); |
b348b7d5 | 2095 | result = set_queue_count(dev, nr_io_queues); |
1b23484b MW |
2096 | if (result < 0) |
2097 | return result; | |
b348b7d5 MW |
2098 | if (result < nr_io_queues) |
2099 | nr_io_queues = result; | |
b60503ba | 2100 | |
9d713c2b KB |
2101 | size = db_bar_size(dev, nr_io_queues); |
2102 | if (size > 8192) { | |
f1938f6e | 2103 | iounmap(dev->bar); |
9d713c2b KB |
2104 | do { |
2105 | dev->bar = ioremap(pci_resource_start(pdev, 0), size); | |
2106 | if (dev->bar) | |
2107 | break; | |
2108 | if (!--nr_io_queues) | |
2109 | return -ENOMEM; | |
2110 | size = db_bar_size(dev, nr_io_queues); | |
2111 | } while (1); | |
f1938f6e | 2112 | dev->dbs = ((void __iomem *)dev->bar) + 4096; |
5a92e700 | 2113 | adminq->q_db = dev->dbs; |
f1938f6e MW |
2114 | } |
2115 | ||
9d713c2b | 2116 | /* Deregister the admin queue's interrupt */ |
3193f07b | 2117 | free_irq(dev->entry[0].vector, adminq); |
9d713c2b | 2118 | |
be577fab | 2119 | for (i = 0; i < nr_io_queues; i++) |
1b23484b | 2120 | dev->entry[i].entry = i; |
be577fab AG |
2121 | vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); |
2122 | if (vecs < 0) { | |
2123 | vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); | |
2124 | if (vecs < 0) { | |
2125 | vecs = 1; | |
2126 | } else { | |
2127 | for (i = 0; i < vecs; i++) | |
2128 | dev->entry[i].vector = i + pdev->irq; | |
fa08a396 RRG |
2129 | } |
2130 | } | |
2131 | ||
063a8096 MW |
2132 | /* |
2133 | * Should investigate if there's a performance win from allocating | |
2134 | * more queues than interrupt vectors; it might allow the submission | |
2135 | * path to scale better, even if the receive path is limited by the | |
2136 | * number of interrupts. | |
2137 | */ | |
2138 | nr_io_queues = vecs; | |
42f61420 | 2139 | dev->max_qid = nr_io_queues; |
063a8096 | 2140 | |
3193f07b | 2141 | result = queue_request_irq(dev, adminq, adminq->irqname); |
9d713c2b | 2142 | if (result) { |
3193f07b | 2143 | adminq->q_suspended = 1; |
22404274 | 2144 | goto free_queues; |
9d713c2b | 2145 | } |
1b23484b | 2146 | |
cd638946 | 2147 | /* Free previously allocated queues that are no longer usable */ |
42f61420 KB |
2148 | nvme_free_queues(dev, nr_io_queues + 1); |
2149 | nvme_assign_io_queues(dev); | |
9ecdc946 | 2150 | |
33b1e95c KB |
2151 | dev->nb.notifier_call = &nvme_cpu_notify; |
2152 | result = register_hotcpu_notifier(&dev->nb); | |
2153 | if (result) | |
2154 | goto free_queues; | |
b60503ba | 2155 | |
22404274 | 2156 | return 0; |
b60503ba | 2157 | |
22404274 | 2158 | free_queues: |
a1a5ef99 | 2159 | nvme_free_queues(dev, 1); |
22404274 | 2160 | return result; |
b60503ba MW |
2161 | } |
2162 | ||
422ef0c7 MW |
2163 | /* |
2164 | * Return: error value if an error occurred setting up the queues or calling | |
2165 | * Identify Device. 0 if these succeeded, even if adding some of the | |
2166 | * namespaces failed. At the moment, these failures are silent. TBD which | |
2167 | * failures should be reported. | |
2168 | */ | |
8d85fce7 | 2169 | static int nvme_dev_add(struct nvme_dev *dev) |
b60503ba | 2170 | { |
68608c26 | 2171 | struct pci_dev *pdev = dev->pci_dev; |
c3bfe717 MW |
2172 | int res; |
2173 | unsigned nn, i; | |
cbb6218f | 2174 | struct nvme_ns *ns; |
51814232 | 2175 | struct nvme_id_ctrl *ctrl; |
bc5fc7e4 MW |
2176 | struct nvme_id_ns *id_ns; |
2177 | void *mem; | |
b60503ba | 2178 | dma_addr_t dma_addr; |
159b67d7 | 2179 | int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; |
b60503ba | 2180 | |
68608c26 | 2181 | mem = dma_alloc_coherent(&pdev->dev, 8192, &dma_addr, GFP_KERNEL); |
a9ef4343 KB |
2182 | if (!mem) |
2183 | return -ENOMEM; | |
b60503ba | 2184 | |
bc5fc7e4 | 2185 | res = nvme_identify(dev, 0, 1, dma_addr); |
b60503ba MW |
2186 | if (res) { |
2187 | res = -EIO; | |
cbb6218f | 2188 | goto out; |
b60503ba MW |
2189 | } |
2190 | ||
bc5fc7e4 | 2191 | ctrl = mem; |
51814232 | 2192 | nn = le32_to_cpup(&ctrl->nn); |
0e5e4f0e | 2193 | dev->oncs = le16_to_cpup(&ctrl->oncs); |
c30341dc | 2194 | dev->abort_limit = ctrl->acl + 1; |
51814232 MW |
2195 | memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn)); |
2196 | memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn)); | |
2197 | memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr)); | |
159b67d7 | 2198 | if (ctrl->mdts) |
8fc23e03 | 2199 | dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9); |
68608c26 MW |
2200 | if ((pdev->vendor == PCI_VENDOR_ID_INTEL) && |
2201 | (pdev->device == 0x0953) && ctrl->vs[3]) | |
159b67d7 | 2202 | dev->stripe_size = 1 << (ctrl->vs[3] + shift); |
b60503ba | 2203 | |
bc5fc7e4 | 2204 | id_ns = mem; |
2b2c1896 | 2205 | for (i = 1; i <= nn; i++) { |
bc5fc7e4 | 2206 | res = nvme_identify(dev, i, 0, dma_addr); |
b60503ba MW |
2207 | if (res) |
2208 | continue; | |
2209 | ||
bc5fc7e4 | 2210 | if (id_ns->ncap == 0) |
b60503ba MW |
2211 | continue; |
2212 | ||
bc5fc7e4 | 2213 | res = nvme_get_features(dev, NVME_FEAT_LBA_RANGE, i, |
08df1e05 | 2214 | dma_addr + 4096, NULL); |
b60503ba | 2215 | if (res) |
12209036 | 2216 | memset(mem + 4096, 0, 4096); |
b60503ba | 2217 | |
bc5fc7e4 | 2218 | ns = nvme_alloc_ns(dev, i, mem, mem + 4096); |
b60503ba MW |
2219 | if (ns) |
2220 | list_add_tail(&ns->list, &dev->namespaces); | |
2221 | } | |
2222 | list_for_each_entry(ns, &dev->namespaces, list) | |
2223 | add_disk(ns->disk); | |
422ef0c7 | 2224 | res = 0; |
b60503ba | 2225 | |
bc5fc7e4 | 2226 | out: |
684f5c20 | 2227 | dma_free_coherent(&dev->pci_dev->dev, 8192, mem, dma_addr); |
b60503ba MW |
2228 | return res; |
2229 | } | |
2230 | ||
0877cb0d KB |
2231 | static int nvme_dev_map(struct nvme_dev *dev) |
2232 | { | |
42f61420 | 2233 | u64 cap; |
0877cb0d KB |
2234 | int bars, result = -ENOMEM; |
2235 | struct pci_dev *pdev = dev->pci_dev; | |
2236 | ||
2237 | if (pci_enable_device_mem(pdev)) | |
2238 | return result; | |
2239 | ||
2240 | dev->entry[0].vector = pdev->irq; | |
2241 | pci_set_master(pdev); | |
2242 | bars = pci_select_bars(pdev, IORESOURCE_MEM); | |
2243 | if (pci_request_selected_regions(pdev, bars, "nvme")) | |
2244 | goto disable_pci; | |
2245 | ||
052d0efa RK |
2246 | if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)) && |
2247 | dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) | |
2248 | goto disable; | |
0877cb0d | 2249 | |
0877cb0d KB |
2250 | dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); |
2251 | if (!dev->bar) | |
2252 | goto disable; | |
0e53d180 KB |
2253 | if (readl(&dev->bar->csts) == -1) { |
2254 | result = -ENODEV; | |
2255 | goto unmap; | |
2256 | } | |
42f61420 KB |
2257 | cap = readq(&dev->bar->cap); |
2258 | dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); | |
2259 | dev->db_stride = 1 << NVME_CAP_STRIDE(cap); | |
0877cb0d KB |
2260 | dev->dbs = ((void __iomem *)dev->bar) + 4096; |
2261 | ||
2262 | return 0; | |
2263 | ||
0e53d180 KB |
2264 | unmap: |
2265 | iounmap(dev->bar); | |
2266 | dev->bar = NULL; | |
0877cb0d KB |
2267 | disable: |
2268 | pci_release_regions(pdev); | |
2269 | disable_pci: | |
2270 | pci_disable_device(pdev); | |
2271 | return result; | |
2272 | } | |
2273 | ||
2274 | static void nvme_dev_unmap(struct nvme_dev *dev) | |
2275 | { | |
2276 | if (dev->pci_dev->msi_enabled) | |
2277 | pci_disable_msi(dev->pci_dev); | |
2278 | else if (dev->pci_dev->msix_enabled) | |
2279 | pci_disable_msix(dev->pci_dev); | |
2280 | ||
2281 | if (dev->bar) { | |
2282 | iounmap(dev->bar); | |
2283 | dev->bar = NULL; | |
9a6b9458 | 2284 | pci_release_regions(dev->pci_dev); |
0877cb0d KB |
2285 | } |
2286 | ||
0877cb0d KB |
2287 | if (pci_is_enabled(dev->pci_dev)) |
2288 | pci_disable_device(dev->pci_dev); | |
2289 | } | |
2290 | ||
4d115420 KB |
2291 | struct nvme_delq_ctx { |
2292 | struct task_struct *waiter; | |
2293 | struct kthread_worker *worker; | |
2294 | atomic_t refcount; | |
2295 | }; | |
2296 | ||
2297 | static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev) | |
2298 | { | |
2299 | dq->waiter = current; | |
2300 | mb(); | |
2301 | ||
2302 | for (;;) { | |
2303 | set_current_state(TASK_KILLABLE); | |
2304 | if (!atomic_read(&dq->refcount)) | |
2305 | break; | |
2306 | if (!schedule_timeout(ADMIN_TIMEOUT) || | |
2307 | fatal_signal_pending(current)) { | |
2308 | set_current_state(TASK_RUNNING); | |
2309 | ||
2310 | nvme_disable_ctrl(dev, readq(&dev->bar->cap)); | |
2311 | nvme_disable_queue(dev, 0); | |
2312 | ||
2313 | send_sig(SIGKILL, dq->worker->task, 1); | |
2314 | flush_kthread_worker(dq->worker); | |
2315 | return; | |
2316 | } | |
2317 | } | |
2318 | set_current_state(TASK_RUNNING); | |
2319 | } | |
2320 | ||
2321 | static void nvme_put_dq(struct nvme_delq_ctx *dq) | |
2322 | { | |
2323 | atomic_dec(&dq->refcount); | |
2324 | if (dq->waiter) | |
2325 | wake_up_process(dq->waiter); | |
2326 | } | |
2327 | ||
2328 | static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq) | |
2329 | { | |
2330 | atomic_inc(&dq->refcount); | |
2331 | return dq; | |
2332 | } | |
2333 | ||
2334 | static void nvme_del_queue_end(struct nvme_queue *nvmeq) | |
2335 | { | |
2336 | struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx; | |
2337 | ||
2338 | nvme_clear_queue(nvmeq); | |
2339 | nvme_put_dq(dq); | |
2340 | } | |
2341 | ||
2342 | static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode, | |
2343 | kthread_work_func_t fn) | |
2344 | { | |
2345 | struct nvme_command c; | |
2346 | ||
2347 | memset(&c, 0, sizeof(c)); | |
2348 | c.delete_queue.opcode = opcode; | |
2349 | c.delete_queue.qid = cpu_to_le16(nvmeq->qid); | |
2350 | ||
2351 | init_kthread_work(&nvmeq->cmdinfo.work, fn); | |
2352 | return nvme_submit_admin_cmd_async(nvmeq->dev, &c, &nvmeq->cmdinfo); | |
2353 | } | |
2354 | ||
2355 | static void nvme_del_cq_work_handler(struct kthread_work *work) | |
2356 | { | |
2357 | struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, | |
2358 | cmdinfo.work); | |
2359 | nvme_del_queue_end(nvmeq); | |
2360 | } | |
2361 | ||
2362 | static int nvme_delete_cq(struct nvme_queue *nvmeq) | |
2363 | { | |
2364 | return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq, | |
2365 | nvme_del_cq_work_handler); | |
2366 | } | |
2367 | ||
2368 | static void nvme_del_sq_work_handler(struct kthread_work *work) | |
2369 | { | |
2370 | struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, | |
2371 | cmdinfo.work); | |
2372 | int status = nvmeq->cmdinfo.status; | |
2373 | ||
2374 | if (!status) | |
2375 | status = nvme_delete_cq(nvmeq); | |
2376 | if (status) | |
2377 | nvme_del_queue_end(nvmeq); | |
2378 | } | |
2379 | ||
2380 | static int nvme_delete_sq(struct nvme_queue *nvmeq) | |
2381 | { | |
2382 | return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq, | |
2383 | nvme_del_sq_work_handler); | |
2384 | } | |
2385 | ||
2386 | static void nvme_del_queue_start(struct kthread_work *work) | |
2387 | { | |
2388 | struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, | |
2389 | cmdinfo.work); | |
2390 | allow_signal(SIGKILL); | |
2391 | if (nvme_delete_sq(nvmeq)) | |
2392 | nvme_del_queue_end(nvmeq); | |
2393 | } | |
2394 | ||
2395 | static void nvme_disable_io_queues(struct nvme_dev *dev) | |
2396 | { | |
2397 | int i; | |
2398 | DEFINE_KTHREAD_WORKER_ONSTACK(worker); | |
2399 | struct nvme_delq_ctx dq; | |
2400 | struct task_struct *kworker_task = kthread_run(kthread_worker_fn, | |
2401 | &worker, "nvme%d", dev->instance); | |
2402 | ||
2403 | if (IS_ERR(kworker_task)) { | |
2404 | dev_err(&dev->pci_dev->dev, | |
2405 | "Failed to create queue del task\n"); | |
2406 | for (i = dev->queue_count - 1; i > 0; i--) | |
2407 | nvme_disable_queue(dev, i); | |
2408 | return; | |
2409 | } | |
2410 | ||
2411 | dq.waiter = NULL; | |
2412 | atomic_set(&dq.refcount, 0); | |
2413 | dq.worker = &worker; | |
2414 | for (i = dev->queue_count - 1; i > 0; i--) { | |
5a92e700 | 2415 | struct nvme_queue *nvmeq = raw_nvmeq(dev, i); |
4d115420 KB |
2416 | |
2417 | if (nvme_suspend_queue(nvmeq)) | |
2418 | continue; | |
2419 | nvmeq->cmdinfo.ctx = nvme_get_dq(&dq); | |
2420 | nvmeq->cmdinfo.worker = dq.worker; | |
2421 | init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start); | |
2422 | queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work); | |
2423 | } | |
2424 | nvme_wait_dq(&dq, dev); | |
2425 | kthread_stop(kworker_task); | |
2426 | } | |
2427 | ||
b9afca3e DM |
2428 | /* |
2429 | * Remove the node from the device list and check | |
2430 | * for whether or not we need to stop the nvme_thread. | |
2431 | */ | |
2432 | static void nvme_dev_list_remove(struct nvme_dev *dev) | |
2433 | { | |
2434 | struct task_struct *tmp = NULL; | |
2435 | ||
2436 | spin_lock(&dev_list_lock); | |
2437 | list_del_init(&dev->node); | |
2438 | if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) { | |
2439 | tmp = nvme_thread; | |
2440 | nvme_thread = NULL; | |
2441 | } | |
2442 | spin_unlock(&dev_list_lock); | |
2443 | ||
2444 | if (tmp) | |
2445 | kthread_stop(tmp); | |
2446 | } | |
2447 | ||
f0b50732 | 2448 | static void nvme_dev_shutdown(struct nvme_dev *dev) |
b60503ba | 2449 | { |
22404274 KB |
2450 | int i; |
2451 | ||
d4b4ff8e | 2452 | dev->initialized = 0; |
33b1e95c | 2453 | unregister_hotcpu_notifier(&dev->nb); |
b60503ba | 2454 | |
b9afca3e | 2455 | nvme_dev_list_remove(dev); |
1fa6aead | 2456 | |
4d115420 KB |
2457 | if (!dev->bar || (dev->bar && readl(&dev->bar->csts) == -1)) { |
2458 | for (i = dev->queue_count - 1; i >= 0; i--) { | |
5a92e700 | 2459 | struct nvme_queue *nvmeq = raw_nvmeq(dev, i); |
4d115420 KB |
2460 | nvme_suspend_queue(nvmeq); |
2461 | nvme_clear_queue(nvmeq); | |
2462 | } | |
2463 | } else { | |
2464 | nvme_disable_io_queues(dev); | |
1894d8f1 | 2465 | nvme_shutdown_ctrl(dev); |
4d115420 KB |
2466 | nvme_disable_queue(dev, 0); |
2467 | } | |
f0b50732 KB |
2468 | nvme_dev_unmap(dev); |
2469 | } | |
2470 | ||
2471 | static void nvme_dev_remove(struct nvme_dev *dev) | |
2472 | { | |
9ac27090 | 2473 | struct nvme_ns *ns; |
f0b50732 | 2474 | |
9ac27090 KB |
2475 | list_for_each_entry(ns, &dev->namespaces, list) { |
2476 | if (ns->disk->flags & GENHD_FL_UP) | |
2477 | del_gendisk(ns->disk); | |
2478 | if (!blk_queue_dying(ns->queue)) | |
2479 | blk_cleanup_queue(ns->queue); | |
b60503ba | 2480 | } |
b60503ba MW |
2481 | } |
2482 | ||
091b6092 MW |
2483 | static int nvme_setup_prp_pools(struct nvme_dev *dev) |
2484 | { | |
2485 | struct device *dmadev = &dev->pci_dev->dev; | |
2486 | dev->prp_page_pool = dma_pool_create("prp list page", dmadev, | |
2487 | PAGE_SIZE, PAGE_SIZE, 0); | |
2488 | if (!dev->prp_page_pool) | |
2489 | return -ENOMEM; | |
2490 | ||
99802a7a MW |
2491 | /* Optimisation for I/Os between 4k and 128k */ |
2492 | dev->prp_small_pool = dma_pool_create("prp list 256", dmadev, | |
2493 | 256, 256, 0); | |
2494 | if (!dev->prp_small_pool) { | |
2495 | dma_pool_destroy(dev->prp_page_pool); | |
2496 | return -ENOMEM; | |
2497 | } | |
091b6092 MW |
2498 | return 0; |
2499 | } | |
2500 | ||
2501 | static void nvme_release_prp_pools(struct nvme_dev *dev) | |
2502 | { | |
2503 | dma_pool_destroy(dev->prp_page_pool); | |
99802a7a | 2504 | dma_pool_destroy(dev->prp_small_pool); |
091b6092 MW |
2505 | } |
2506 | ||
cd58ad7d QSA |
2507 | static DEFINE_IDA(nvme_instance_ida); |
2508 | ||
2509 | static int nvme_set_instance(struct nvme_dev *dev) | |
b60503ba | 2510 | { |
cd58ad7d QSA |
2511 | int instance, error; |
2512 | ||
2513 | do { | |
2514 | if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) | |
2515 | return -ENODEV; | |
2516 | ||
2517 | spin_lock(&dev_list_lock); | |
2518 | error = ida_get_new(&nvme_instance_ida, &instance); | |
2519 | spin_unlock(&dev_list_lock); | |
2520 | } while (error == -EAGAIN); | |
2521 | ||
2522 | if (error) | |
2523 | return -ENODEV; | |
2524 | ||
2525 | dev->instance = instance; | |
2526 | return 0; | |
b60503ba MW |
2527 | } |
2528 | ||
2529 | static void nvme_release_instance(struct nvme_dev *dev) | |
2530 | { | |
cd58ad7d QSA |
2531 | spin_lock(&dev_list_lock); |
2532 | ida_remove(&nvme_instance_ida, dev->instance); | |
2533 | spin_unlock(&dev_list_lock); | |
b60503ba MW |
2534 | } |
2535 | ||
9ac27090 KB |
2536 | static void nvme_free_namespaces(struct nvme_dev *dev) |
2537 | { | |
2538 | struct nvme_ns *ns, *next; | |
2539 | ||
2540 | list_for_each_entry_safe(ns, next, &dev->namespaces, list) { | |
2541 | list_del(&ns->list); | |
2542 | put_disk(ns->disk); | |
2543 | kfree(ns); | |
2544 | } | |
2545 | } | |
2546 | ||
5e82e952 KB |
2547 | static void nvme_free_dev(struct kref *kref) |
2548 | { | |
2549 | struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref); | |
9ac27090 KB |
2550 | |
2551 | nvme_free_namespaces(dev); | |
42f61420 | 2552 | free_percpu(dev->io_queue); |
5e82e952 KB |
2553 | kfree(dev->queues); |
2554 | kfree(dev->entry); | |
2555 | kfree(dev); | |
2556 | } | |
2557 | ||
2558 | static int nvme_dev_open(struct inode *inode, struct file *f) | |
2559 | { | |
2560 | struct nvme_dev *dev = container_of(f->private_data, struct nvme_dev, | |
2561 | miscdev); | |
2562 | kref_get(&dev->kref); | |
2563 | f->private_data = dev; | |
2564 | return 0; | |
2565 | } | |
2566 | ||
2567 | static int nvme_dev_release(struct inode *inode, struct file *f) | |
2568 | { | |
2569 | struct nvme_dev *dev = f->private_data; | |
2570 | kref_put(&dev->kref, nvme_free_dev); | |
2571 | return 0; | |
2572 | } | |
2573 | ||
2574 | static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg) | |
2575 | { | |
2576 | struct nvme_dev *dev = f->private_data; | |
2577 | switch (cmd) { | |
2578 | case NVME_IOCTL_ADMIN_CMD: | |
2579 | return nvme_user_admin_cmd(dev, (void __user *)arg); | |
2580 | default: | |
2581 | return -ENOTTY; | |
2582 | } | |
2583 | } | |
2584 | ||
2585 | static const struct file_operations nvme_dev_fops = { | |
2586 | .owner = THIS_MODULE, | |
2587 | .open = nvme_dev_open, | |
2588 | .release = nvme_dev_release, | |
2589 | .unlocked_ioctl = nvme_dev_ioctl, | |
2590 | .compat_ioctl = nvme_dev_ioctl, | |
2591 | }; | |
2592 | ||
f0b50732 KB |
2593 | static int nvme_dev_start(struct nvme_dev *dev) |
2594 | { | |
2595 | int result; | |
b9afca3e | 2596 | bool start_thread = false; |
f0b50732 KB |
2597 | |
2598 | result = nvme_dev_map(dev); | |
2599 | if (result) | |
2600 | return result; | |
2601 | ||
2602 | result = nvme_configure_admin_queue(dev); | |
2603 | if (result) | |
2604 | goto unmap; | |
2605 | ||
2606 | spin_lock(&dev_list_lock); | |
b9afca3e DM |
2607 | if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) { |
2608 | start_thread = true; | |
2609 | nvme_thread = NULL; | |
2610 | } | |
f0b50732 KB |
2611 | list_add(&dev->node, &dev_list); |
2612 | spin_unlock(&dev_list_lock); | |
2613 | ||
b9afca3e DM |
2614 | if (start_thread) { |
2615 | nvme_thread = kthread_run(nvme_kthread, NULL, "nvme"); | |
2616 | wake_up(&nvme_kthread_wait); | |
2617 | } else | |
2618 | wait_event_killable(nvme_kthread_wait, nvme_thread); | |
2619 | ||
2620 | if (IS_ERR_OR_NULL(nvme_thread)) { | |
2621 | result = nvme_thread ? PTR_ERR(nvme_thread) : -EINTR; | |
2622 | goto disable; | |
2623 | } | |
2624 | ||
f0b50732 | 2625 | result = nvme_setup_io_queues(dev); |
d82e8bfd | 2626 | if (result && result != -EBUSY) |
f0b50732 KB |
2627 | goto disable; |
2628 | ||
d82e8bfd | 2629 | return result; |
f0b50732 KB |
2630 | |
2631 | disable: | |
a1a5ef99 | 2632 | nvme_disable_queue(dev, 0); |
b9afca3e | 2633 | nvme_dev_list_remove(dev); |
f0b50732 KB |
2634 | unmap: |
2635 | nvme_dev_unmap(dev); | |
2636 | return result; | |
2637 | } | |
2638 | ||
9a6b9458 KB |
2639 | static int nvme_remove_dead_ctrl(void *arg) |
2640 | { | |
2641 | struct nvme_dev *dev = (struct nvme_dev *)arg; | |
2642 | struct pci_dev *pdev = dev->pci_dev; | |
2643 | ||
2644 | if (pci_get_drvdata(pdev)) | |
2645 | pci_stop_and_remove_bus_device(pdev); | |
2646 | kref_put(&dev->kref, nvme_free_dev); | |
2647 | return 0; | |
2648 | } | |
2649 | ||
2650 | static void nvme_remove_disks(struct work_struct *ws) | |
2651 | { | |
9a6b9458 KB |
2652 | struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work); |
2653 | ||
2654 | nvme_dev_remove(dev); | |
5a92e700 | 2655 | nvme_free_queues(dev, 1); |
9a6b9458 KB |
2656 | } |
2657 | ||
2658 | static int nvme_dev_resume(struct nvme_dev *dev) | |
2659 | { | |
2660 | int ret; | |
2661 | ||
2662 | ret = nvme_dev_start(dev); | |
2663 | if (ret && ret != -EBUSY) | |
2664 | return ret; | |
2665 | if (ret == -EBUSY) { | |
2666 | spin_lock(&dev_list_lock); | |
9ca97374 | 2667 | dev->reset_workfn = nvme_remove_disks; |
9a6b9458 KB |
2668 | queue_work(nvme_workq, &dev->reset_work); |
2669 | spin_unlock(&dev_list_lock); | |
2670 | } | |
d4b4ff8e | 2671 | dev->initialized = 1; |
9a6b9458 KB |
2672 | return 0; |
2673 | } | |
2674 | ||
2675 | static void nvme_dev_reset(struct nvme_dev *dev) | |
2676 | { | |
2677 | nvme_dev_shutdown(dev); | |
2678 | if (nvme_dev_resume(dev)) { | |
2679 | dev_err(&dev->pci_dev->dev, "Device failed to resume\n"); | |
2680 | kref_get(&dev->kref); | |
2681 | if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d", | |
2682 | dev->instance))) { | |
2683 | dev_err(&dev->pci_dev->dev, | |
2684 | "Failed to start controller remove task\n"); | |
2685 | kref_put(&dev->kref, nvme_free_dev); | |
2686 | } | |
2687 | } | |
2688 | } | |
2689 | ||
2690 | static void nvme_reset_failed_dev(struct work_struct *ws) | |
2691 | { | |
2692 | struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work); | |
2693 | nvme_dev_reset(dev); | |
2694 | } | |
2695 | ||
9ca97374 TH |
2696 | static void nvme_reset_workfn(struct work_struct *work) |
2697 | { | |
2698 | struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work); | |
2699 | dev->reset_workfn(work); | |
2700 | } | |
2701 | ||
8d85fce7 | 2702 | static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
b60503ba | 2703 | { |
0877cb0d | 2704 | int result = -ENOMEM; |
b60503ba MW |
2705 | struct nvme_dev *dev; |
2706 | ||
2707 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2708 | if (!dev) | |
2709 | return -ENOMEM; | |
2710 | dev->entry = kcalloc(num_possible_cpus(), sizeof(*dev->entry), | |
2711 | GFP_KERNEL); | |
2712 | if (!dev->entry) | |
2713 | goto free; | |
1b23484b MW |
2714 | dev->queues = kcalloc(num_possible_cpus() + 1, sizeof(void *), |
2715 | GFP_KERNEL); | |
b60503ba MW |
2716 | if (!dev->queues) |
2717 | goto free; | |
42f61420 KB |
2718 | dev->io_queue = alloc_percpu(unsigned short); |
2719 | if (!dev->io_queue) | |
2720 | goto free; | |
b60503ba MW |
2721 | |
2722 | INIT_LIST_HEAD(&dev->namespaces); | |
9ca97374 TH |
2723 | dev->reset_workfn = nvme_reset_failed_dev; |
2724 | INIT_WORK(&dev->reset_work, nvme_reset_workfn); | |
b60503ba | 2725 | dev->pci_dev = pdev; |
9a6b9458 | 2726 | pci_set_drvdata(pdev, dev); |
cd58ad7d QSA |
2727 | result = nvme_set_instance(dev); |
2728 | if (result) | |
0877cb0d | 2729 | goto free; |
b60503ba | 2730 | |
091b6092 MW |
2731 | result = nvme_setup_prp_pools(dev); |
2732 | if (result) | |
0877cb0d | 2733 | goto release; |
091b6092 | 2734 | |
fb35e914 | 2735 | kref_init(&dev->kref); |
f0b50732 | 2736 | result = nvme_dev_start(dev); |
d82e8bfd KB |
2737 | if (result) { |
2738 | if (result == -EBUSY) | |
2739 | goto create_cdev; | |
0877cb0d | 2740 | goto release_pools; |
d82e8bfd | 2741 | } |
b60503ba | 2742 | |
740216fc | 2743 | result = nvme_dev_add(dev); |
d82e8bfd | 2744 | if (result) |
f0b50732 | 2745 | goto shutdown; |
740216fc | 2746 | |
d82e8bfd | 2747 | create_cdev: |
5e82e952 KB |
2748 | scnprintf(dev->name, sizeof(dev->name), "nvme%d", dev->instance); |
2749 | dev->miscdev.minor = MISC_DYNAMIC_MINOR; | |
2750 | dev->miscdev.parent = &pdev->dev; | |
2751 | dev->miscdev.name = dev->name; | |
2752 | dev->miscdev.fops = &nvme_dev_fops; | |
2753 | result = misc_register(&dev->miscdev); | |
2754 | if (result) | |
2755 | goto remove; | |
2756 | ||
d4b4ff8e | 2757 | dev->initialized = 1; |
b60503ba MW |
2758 | return 0; |
2759 | ||
5e82e952 KB |
2760 | remove: |
2761 | nvme_dev_remove(dev); | |
9ac27090 | 2762 | nvme_free_namespaces(dev); |
f0b50732 KB |
2763 | shutdown: |
2764 | nvme_dev_shutdown(dev); | |
0877cb0d | 2765 | release_pools: |
a1a5ef99 | 2766 | nvme_free_queues(dev, 0); |
091b6092 | 2767 | nvme_release_prp_pools(dev); |
0877cb0d KB |
2768 | release: |
2769 | nvme_release_instance(dev); | |
b60503ba | 2770 | free: |
42f61420 | 2771 | free_percpu(dev->io_queue); |
b60503ba MW |
2772 | kfree(dev->queues); |
2773 | kfree(dev->entry); | |
2774 | kfree(dev); | |
2775 | return result; | |
2776 | } | |
2777 | ||
09ece142 KB |
2778 | static void nvme_shutdown(struct pci_dev *pdev) |
2779 | { | |
2780 | struct nvme_dev *dev = pci_get_drvdata(pdev); | |
2781 | nvme_dev_shutdown(dev); | |
2782 | } | |
2783 | ||
8d85fce7 | 2784 | static void nvme_remove(struct pci_dev *pdev) |
b60503ba MW |
2785 | { |
2786 | struct nvme_dev *dev = pci_get_drvdata(pdev); | |
9a6b9458 KB |
2787 | |
2788 | spin_lock(&dev_list_lock); | |
2789 | list_del_init(&dev->node); | |
2790 | spin_unlock(&dev_list_lock); | |
2791 | ||
2792 | pci_set_drvdata(pdev, NULL); | |
2793 | flush_work(&dev->reset_work); | |
5e82e952 | 2794 | misc_deregister(&dev->miscdev); |
9a6b9458 KB |
2795 | nvme_dev_remove(dev); |
2796 | nvme_dev_shutdown(dev); | |
a1a5ef99 | 2797 | nvme_free_queues(dev, 0); |
5a92e700 | 2798 | rcu_barrier(); |
9a6b9458 KB |
2799 | nvme_release_instance(dev); |
2800 | nvme_release_prp_pools(dev); | |
5e82e952 | 2801 | kref_put(&dev->kref, nvme_free_dev); |
b60503ba MW |
2802 | } |
2803 | ||
2804 | /* These functions are yet to be implemented */ | |
2805 | #define nvme_error_detected NULL | |
2806 | #define nvme_dump_registers NULL | |
2807 | #define nvme_link_reset NULL | |
2808 | #define nvme_slot_reset NULL | |
2809 | #define nvme_error_resume NULL | |
cd638946 | 2810 | |
671a6018 | 2811 | #ifdef CONFIG_PM_SLEEP |
cd638946 KB |
2812 | static int nvme_suspend(struct device *dev) |
2813 | { | |
2814 | struct pci_dev *pdev = to_pci_dev(dev); | |
2815 | struct nvme_dev *ndev = pci_get_drvdata(pdev); | |
2816 | ||
2817 | nvme_dev_shutdown(ndev); | |
2818 | return 0; | |
2819 | } | |
2820 | ||
2821 | static int nvme_resume(struct device *dev) | |
2822 | { | |
2823 | struct pci_dev *pdev = to_pci_dev(dev); | |
2824 | struct nvme_dev *ndev = pci_get_drvdata(pdev); | |
cd638946 | 2825 | |
9a6b9458 | 2826 | if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) { |
9ca97374 | 2827 | ndev->reset_workfn = nvme_reset_failed_dev; |
9a6b9458 KB |
2828 | queue_work(nvme_workq, &ndev->reset_work); |
2829 | } | |
2830 | return 0; | |
cd638946 | 2831 | } |
671a6018 | 2832 | #endif |
cd638946 KB |
2833 | |
2834 | static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); | |
b60503ba | 2835 | |
1d352035 | 2836 | static const struct pci_error_handlers nvme_err_handler = { |
b60503ba MW |
2837 | .error_detected = nvme_error_detected, |
2838 | .mmio_enabled = nvme_dump_registers, | |
2839 | .link_reset = nvme_link_reset, | |
2840 | .slot_reset = nvme_slot_reset, | |
2841 | .resume = nvme_error_resume, | |
2842 | }; | |
2843 | ||
2844 | /* Move to pci_ids.h later */ | |
2845 | #define PCI_CLASS_STORAGE_EXPRESS 0x010802 | |
2846 | ||
6eb0d698 | 2847 | static const struct pci_device_id nvme_id_table[] = { |
b60503ba MW |
2848 | { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, |
2849 | { 0, } | |
2850 | }; | |
2851 | MODULE_DEVICE_TABLE(pci, nvme_id_table); | |
2852 | ||
2853 | static struct pci_driver nvme_driver = { | |
2854 | .name = "nvme", | |
2855 | .id_table = nvme_id_table, | |
2856 | .probe = nvme_probe, | |
8d85fce7 | 2857 | .remove = nvme_remove, |
09ece142 | 2858 | .shutdown = nvme_shutdown, |
cd638946 KB |
2859 | .driver = { |
2860 | .pm = &nvme_dev_pm_ops, | |
2861 | }, | |
b60503ba MW |
2862 | .err_handler = &nvme_err_handler, |
2863 | }; | |
2864 | ||
2865 | static int __init nvme_init(void) | |
2866 | { | |
0ac13140 | 2867 | int result; |
1fa6aead | 2868 | |
b9afca3e | 2869 | init_waitqueue_head(&nvme_kthread_wait); |
b60503ba | 2870 | |
9a6b9458 KB |
2871 | nvme_workq = create_singlethread_workqueue("nvme"); |
2872 | if (!nvme_workq) | |
b9afca3e | 2873 | return -ENOMEM; |
9a6b9458 | 2874 | |
5c42ea16 KB |
2875 | result = register_blkdev(nvme_major, "nvme"); |
2876 | if (result < 0) | |
9a6b9458 | 2877 | goto kill_workq; |
5c42ea16 | 2878 | else if (result > 0) |
0ac13140 | 2879 | nvme_major = result; |
b60503ba MW |
2880 | |
2881 | result = pci_register_driver(&nvme_driver); | |
1fa6aead MW |
2882 | if (result) |
2883 | goto unregister_blkdev; | |
2884 | return 0; | |
b60503ba | 2885 | |
1fa6aead | 2886 | unregister_blkdev: |
b60503ba | 2887 | unregister_blkdev(nvme_major, "nvme"); |
9a6b9458 KB |
2888 | kill_workq: |
2889 | destroy_workqueue(nvme_workq); | |
b60503ba MW |
2890 | return result; |
2891 | } | |
2892 | ||
2893 | static void __exit nvme_exit(void) | |
2894 | { | |
2895 | pci_unregister_driver(&nvme_driver); | |
2896 | unregister_blkdev(nvme_major, "nvme"); | |
9a6b9458 | 2897 | destroy_workqueue(nvme_workq); |
b9afca3e | 2898 | BUG_ON(nvme_thread && !IS_ERR(nvme_thread)); |
b60503ba MW |
2899 | } |
2900 | ||
2901 | MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); | |
2902 | MODULE_LICENSE("GPL"); | |
6eb0d698 | 2903 | MODULE_VERSION("0.9"); |
b60503ba MW |
2904 | module_init(nvme_init); |
2905 | module_exit(nvme_exit); |