Commit | Line | Data |
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b60503ba MW |
1 | /* |
2 | * NVM Express device driver | |
3 | * Copyright (c) 2011, Intel Corporation. | |
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> |
fd63e9ce | 23 | #include <linux/delay.h> |
b60503ba MW |
24 | #include <linux/errno.h> |
25 | #include <linux/fs.h> | |
26 | #include <linux/genhd.h> | |
5aff9382 | 27 | #include <linux/idr.h> |
b60503ba MW |
28 | #include <linux/init.h> |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/io.h> | |
31 | #include <linux/kdev_t.h> | |
1fa6aead | 32 | #include <linux/kthread.h> |
b60503ba MW |
33 | #include <linux/kernel.h> |
34 | #include <linux/mm.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/pci.h> | |
be7b6275 | 38 | #include <linux/poison.h> |
b60503ba MW |
39 | #include <linux/sched.h> |
40 | #include <linux/slab.h> | |
41 | #include <linux/types.h> | |
5d0f6131 | 42 | #include <scsi/sg.h> |
797a796a HM |
43 | #include <asm-generic/io-64-nonatomic-lo-hi.h> |
44 | ||
b60503ba MW |
45 | #define NVME_Q_DEPTH 1024 |
46 | #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) | |
47 | #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) | |
48 | #define NVME_MINORS 64 | |
e85248e5 | 49 | #define ADMIN_TIMEOUT (60 * HZ) |
b60503ba MW |
50 | |
51 | static int nvme_major; | |
52 | module_param(nvme_major, int, 0); | |
53 | ||
58ffacb5 MW |
54 | static int use_threaded_interrupts; |
55 | module_param(use_threaded_interrupts, int, 0); | |
56 | ||
1fa6aead MW |
57 | static DEFINE_SPINLOCK(dev_list_lock); |
58 | static LIST_HEAD(dev_list); | |
59 | static struct task_struct *nvme_thread; | |
60 | ||
b60503ba MW |
61 | /* |
62 | * An NVM Express queue. Each device has at least two (one for admin | |
63 | * commands and one for I/O commands). | |
64 | */ | |
65 | struct nvme_queue { | |
66 | struct device *q_dmadev; | |
091b6092 | 67 | struct nvme_dev *dev; |
b60503ba MW |
68 | spinlock_t q_lock; |
69 | struct nvme_command *sq_cmds; | |
70 | volatile struct nvme_completion *cqes; | |
71 | dma_addr_t sq_dma_addr; | |
72 | dma_addr_t cq_dma_addr; | |
73 | wait_queue_head_t sq_full; | |
1fa6aead | 74 | wait_queue_t sq_cong_wait; |
b60503ba MW |
75 | struct bio_list sq_cong; |
76 | u32 __iomem *q_db; | |
77 | u16 q_depth; | |
78 | u16 cq_vector; | |
79 | u16 sq_head; | |
80 | u16 sq_tail; | |
81 | u16 cq_head; | |
82123460 | 82 | u16 cq_phase; |
b60503ba MW |
83 | unsigned long cmdid_data[]; |
84 | }; | |
85 | ||
86 | /* | |
87 | * Check we didin't inadvertently grow the command struct | |
88 | */ | |
89 | static inline void _nvme_check_size(void) | |
90 | { | |
91 | BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); | |
92 | BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); | |
93 | BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); | |
94 | BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); | |
95 | BUILD_BUG_ON(sizeof(struct nvme_features) != 64); | |
f8ebf840 | 96 | BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); |
b60503ba MW |
97 | BUILD_BUG_ON(sizeof(struct nvme_command) != 64); |
98 | BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); | |
99 | BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); | |
100 | BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); | |
6ecec745 | 101 | BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); |
b60503ba MW |
102 | } |
103 | ||
5c1281a3 | 104 | typedef void (*nvme_completion_fn)(struct nvme_dev *, void *, |
c2f5b650 MW |
105 | struct nvme_completion *); |
106 | ||
e85248e5 | 107 | struct nvme_cmd_info { |
c2f5b650 MW |
108 | nvme_completion_fn fn; |
109 | void *ctx; | |
e85248e5 MW |
110 | unsigned long timeout; |
111 | }; | |
112 | ||
113 | static struct nvme_cmd_info *nvme_cmd_info(struct nvme_queue *nvmeq) | |
114 | { | |
115 | return (void *)&nvmeq->cmdid_data[BITS_TO_LONGS(nvmeq->q_depth)]; | |
116 | } | |
117 | ||
b60503ba | 118 | /** |
714a7a22 MW |
119 | * alloc_cmdid() - Allocate a Command ID |
120 | * @nvmeq: The queue that will be used for this command | |
121 | * @ctx: A pointer that will be passed to the handler | |
c2f5b650 | 122 | * @handler: The function to call on completion |
b60503ba MW |
123 | * |
124 | * Allocate a Command ID for a queue. The data passed in will | |
125 | * be passed to the completion handler. This is implemented by using | |
126 | * the bottom two bits of the ctx pointer to store the handler ID. | |
127 | * Passing in a pointer that's not 4-byte aligned will cause a BUG. | |
128 | * We can change this if it becomes a problem. | |
184d2944 MW |
129 | * |
130 | * May be called with local interrupts disabled and the q_lock held, | |
131 | * or with interrupts enabled and no locks held. | |
b60503ba | 132 | */ |
c2f5b650 MW |
133 | static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx, |
134 | nvme_completion_fn handler, unsigned timeout) | |
b60503ba | 135 | { |
e6d15f79 | 136 | int depth = nvmeq->q_depth - 1; |
e85248e5 | 137 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
b60503ba MW |
138 | int cmdid; |
139 | ||
b60503ba MW |
140 | do { |
141 | cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth); | |
142 | if (cmdid >= depth) | |
143 | return -EBUSY; | |
144 | } while (test_and_set_bit(cmdid, nvmeq->cmdid_data)); | |
145 | ||
c2f5b650 MW |
146 | info[cmdid].fn = handler; |
147 | info[cmdid].ctx = ctx; | |
e85248e5 | 148 | info[cmdid].timeout = jiffies + timeout; |
b60503ba MW |
149 | return cmdid; |
150 | } | |
151 | ||
152 | static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx, | |
c2f5b650 | 153 | nvme_completion_fn handler, unsigned timeout) |
b60503ba MW |
154 | { |
155 | int cmdid; | |
156 | wait_event_killable(nvmeq->sq_full, | |
e85248e5 | 157 | (cmdid = alloc_cmdid(nvmeq, ctx, handler, timeout)) >= 0); |
b60503ba MW |
158 | return (cmdid < 0) ? -EINTR : cmdid; |
159 | } | |
160 | ||
c2f5b650 MW |
161 | /* Special values must be less than 0x1000 */ |
162 | #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA) | |
d2d87034 MW |
163 | #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) |
164 | #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) | |
165 | #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) | |
00df5cb4 | 166 | #define CMD_CTX_FLUSH (0x318 + CMD_CTX_BASE) |
be7b6275 | 167 | |
5c1281a3 | 168 | static void special_completion(struct nvme_dev *dev, void *ctx, |
c2f5b650 MW |
169 | struct nvme_completion *cqe) |
170 | { | |
171 | if (ctx == CMD_CTX_CANCELLED) | |
172 | return; | |
173 | if (ctx == CMD_CTX_FLUSH) | |
174 | return; | |
175 | if (ctx == CMD_CTX_COMPLETED) { | |
5c1281a3 | 176 | dev_warn(&dev->pci_dev->dev, |
c2f5b650 MW |
177 | "completed id %d twice on queue %d\n", |
178 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
179 | return; | |
180 | } | |
181 | if (ctx == CMD_CTX_INVALID) { | |
5c1281a3 | 182 | dev_warn(&dev->pci_dev->dev, |
c2f5b650 MW |
183 | "invalid id %d completed on queue %d\n", |
184 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
185 | return; | |
186 | } | |
187 | ||
5c1281a3 | 188 | dev_warn(&dev->pci_dev->dev, "Unknown special completion %p\n", ctx); |
c2f5b650 MW |
189 | } |
190 | ||
184d2944 MW |
191 | /* |
192 | * Called with local interrupts disabled and the q_lock held. May not sleep. | |
193 | */ | |
c2f5b650 MW |
194 | static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid, |
195 | nvme_completion_fn *fn) | |
b60503ba | 196 | { |
c2f5b650 | 197 | void *ctx; |
e85248e5 | 198 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
b60503ba | 199 | |
c2f5b650 MW |
200 | if (cmdid >= nvmeq->q_depth) { |
201 | *fn = special_completion; | |
48e3d398 | 202 | return CMD_CTX_INVALID; |
c2f5b650 | 203 | } |
859361a2 KB |
204 | if (fn) |
205 | *fn = info[cmdid].fn; | |
c2f5b650 MW |
206 | ctx = info[cmdid].ctx; |
207 | info[cmdid].fn = special_completion; | |
e85248e5 | 208 | info[cmdid].ctx = CMD_CTX_COMPLETED; |
b60503ba MW |
209 | clear_bit(cmdid, nvmeq->cmdid_data); |
210 | wake_up(&nvmeq->sq_full); | |
c2f5b650 | 211 | return ctx; |
b60503ba MW |
212 | } |
213 | ||
c2f5b650 MW |
214 | static void *cancel_cmdid(struct nvme_queue *nvmeq, int cmdid, |
215 | nvme_completion_fn *fn) | |
3c0cf138 | 216 | { |
c2f5b650 | 217 | void *ctx; |
e85248e5 | 218 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
c2f5b650 MW |
219 | if (fn) |
220 | *fn = info[cmdid].fn; | |
221 | ctx = info[cmdid].ctx; | |
222 | info[cmdid].fn = special_completion; | |
e85248e5 | 223 | info[cmdid].ctx = CMD_CTX_CANCELLED; |
c2f5b650 | 224 | return ctx; |
3c0cf138 MW |
225 | } |
226 | ||
5d0f6131 | 227 | struct nvme_queue *get_nvmeq(struct nvme_dev *dev) |
b60503ba | 228 | { |
040a93b5 | 229 | return dev->queues[get_cpu() + 1]; |
b60503ba MW |
230 | } |
231 | ||
5d0f6131 | 232 | void put_nvmeq(struct nvme_queue *nvmeq) |
b60503ba | 233 | { |
1b23484b | 234 | put_cpu(); |
b60503ba MW |
235 | } |
236 | ||
237 | /** | |
714a7a22 | 238 | * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell |
b60503ba MW |
239 | * @nvmeq: The queue to use |
240 | * @cmd: The command to send | |
241 | * | |
242 | * Safe to use from interrupt context | |
243 | */ | |
244 | static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) | |
245 | { | |
246 | unsigned long flags; | |
247 | u16 tail; | |
b60503ba MW |
248 | spin_lock_irqsave(&nvmeq->q_lock, flags); |
249 | tail = nvmeq->sq_tail; | |
250 | memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); | |
b60503ba MW |
251 | if (++tail == nvmeq->q_depth) |
252 | tail = 0; | |
7547881d | 253 | writel(tail, nvmeq->q_db); |
b60503ba MW |
254 | nvmeq->sq_tail = tail; |
255 | spin_unlock_irqrestore(&nvmeq->q_lock, flags); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
eca18b23 | 260 | static __le64 **iod_list(struct nvme_iod *iod) |
e025344c | 261 | { |
eca18b23 | 262 | return ((void *)iod) + iod->offset; |
e025344c SMM |
263 | } |
264 | ||
eca18b23 MW |
265 | /* |
266 | * Will slightly overestimate the number of pages needed. This is OK | |
267 | * as it only leads to a small amount of wasted memory for the lifetime of | |
268 | * the I/O. | |
269 | */ | |
270 | static int nvme_npages(unsigned size) | |
271 | { | |
272 | unsigned nprps = DIV_ROUND_UP(size + PAGE_SIZE, PAGE_SIZE); | |
273 | return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); | |
274 | } | |
b60503ba | 275 | |
eca18b23 MW |
276 | static struct nvme_iod * |
277 | nvme_alloc_iod(unsigned nseg, unsigned nbytes, gfp_t gfp) | |
b60503ba | 278 | { |
eca18b23 MW |
279 | struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) + |
280 | sizeof(__le64 *) * nvme_npages(nbytes) + | |
281 | sizeof(struct scatterlist) * nseg, gfp); | |
282 | ||
283 | if (iod) { | |
284 | iod->offset = offsetof(struct nvme_iod, sg[nseg]); | |
285 | iod->npages = -1; | |
286 | iod->length = nbytes; | |
2b196034 | 287 | iod->nents = 0; |
eca18b23 MW |
288 | } |
289 | ||
290 | return iod; | |
b60503ba MW |
291 | } |
292 | ||
5d0f6131 | 293 | void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) |
b60503ba | 294 | { |
eca18b23 MW |
295 | const int last_prp = PAGE_SIZE / 8 - 1; |
296 | int i; | |
297 | __le64 **list = iod_list(iod); | |
298 | dma_addr_t prp_dma = iod->first_dma; | |
299 | ||
300 | if (iod->npages == 0) | |
301 | dma_pool_free(dev->prp_small_pool, list[0], prp_dma); | |
302 | for (i = 0; i < iod->npages; i++) { | |
303 | __le64 *prp_list = list[i]; | |
304 | dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); | |
305 | dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); | |
306 | prp_dma = next_prp_dma; | |
307 | } | |
308 | kfree(iod); | |
b60503ba MW |
309 | } |
310 | ||
5c1281a3 | 311 | static void bio_completion(struct nvme_dev *dev, void *ctx, |
b60503ba MW |
312 | struct nvme_completion *cqe) |
313 | { | |
eca18b23 MW |
314 | struct nvme_iod *iod = ctx; |
315 | struct bio *bio = iod->private; | |
b60503ba MW |
316 | u16 status = le16_to_cpup(&cqe->status) >> 1; |
317 | ||
2b196034 KB |
318 | if (iod->nents) |
319 | dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents, | |
b60503ba | 320 | bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
eca18b23 | 321 | nvme_free_iod(dev, iod); |
427e9708 | 322 | if (status) |
1ad2f893 | 323 | bio_endio(bio, -EIO); |
427e9708 | 324 | else |
1ad2f893 | 325 | bio_endio(bio, 0); |
b60503ba MW |
326 | } |
327 | ||
184d2944 | 328 | /* length is in bytes. gfp flags indicates whether we may sleep. */ |
5d0f6131 VV |
329 | int nvme_setup_prps(struct nvme_dev *dev, struct nvme_common_command *cmd, |
330 | struct nvme_iod *iod, int total_len, gfp_t gfp) | |
ff22b54f | 331 | { |
99802a7a | 332 | struct dma_pool *pool; |
eca18b23 MW |
333 | int length = total_len; |
334 | struct scatterlist *sg = iod->sg; | |
ff22b54f MW |
335 | int dma_len = sg_dma_len(sg); |
336 | u64 dma_addr = sg_dma_address(sg); | |
337 | int offset = offset_in_page(dma_addr); | |
e025344c | 338 | __le64 *prp_list; |
eca18b23 | 339 | __le64 **list = iod_list(iod); |
e025344c | 340 | dma_addr_t prp_dma; |
eca18b23 | 341 | int nprps, i; |
ff22b54f MW |
342 | |
343 | cmd->prp1 = cpu_to_le64(dma_addr); | |
344 | length -= (PAGE_SIZE - offset); | |
345 | if (length <= 0) | |
eca18b23 | 346 | return total_len; |
ff22b54f MW |
347 | |
348 | dma_len -= (PAGE_SIZE - offset); | |
349 | if (dma_len) { | |
350 | dma_addr += (PAGE_SIZE - offset); | |
351 | } else { | |
352 | sg = sg_next(sg); | |
353 | dma_addr = sg_dma_address(sg); | |
354 | dma_len = sg_dma_len(sg); | |
355 | } | |
356 | ||
357 | if (length <= PAGE_SIZE) { | |
358 | cmd->prp2 = cpu_to_le64(dma_addr); | |
eca18b23 | 359 | return total_len; |
e025344c SMM |
360 | } |
361 | ||
362 | nprps = DIV_ROUND_UP(length, PAGE_SIZE); | |
99802a7a MW |
363 | if (nprps <= (256 / 8)) { |
364 | pool = dev->prp_small_pool; | |
eca18b23 | 365 | iod->npages = 0; |
99802a7a MW |
366 | } else { |
367 | pool = dev->prp_page_pool; | |
eca18b23 | 368 | iod->npages = 1; |
99802a7a MW |
369 | } |
370 | ||
b77954cb MW |
371 | prp_list = dma_pool_alloc(pool, gfp, &prp_dma); |
372 | if (!prp_list) { | |
373 | cmd->prp2 = cpu_to_le64(dma_addr); | |
eca18b23 MW |
374 | iod->npages = -1; |
375 | return (total_len - length) + PAGE_SIZE; | |
b77954cb | 376 | } |
eca18b23 MW |
377 | list[0] = prp_list; |
378 | iod->first_dma = prp_dma; | |
e025344c SMM |
379 | cmd->prp2 = cpu_to_le64(prp_dma); |
380 | i = 0; | |
381 | for (;;) { | |
7523d834 | 382 | if (i == PAGE_SIZE / 8) { |
e025344c | 383 | __le64 *old_prp_list = prp_list; |
b77954cb | 384 | prp_list = dma_pool_alloc(pool, gfp, &prp_dma); |
eca18b23 MW |
385 | if (!prp_list) |
386 | return total_len - length; | |
387 | list[iod->npages++] = prp_list; | |
7523d834 MW |
388 | prp_list[0] = old_prp_list[i - 1]; |
389 | old_prp_list[i - 1] = cpu_to_le64(prp_dma); | |
390 | i = 1; | |
e025344c SMM |
391 | } |
392 | prp_list[i++] = cpu_to_le64(dma_addr); | |
393 | dma_len -= PAGE_SIZE; | |
394 | dma_addr += PAGE_SIZE; | |
395 | length -= PAGE_SIZE; | |
396 | if (length <= 0) | |
397 | break; | |
398 | if (dma_len > 0) | |
399 | continue; | |
400 | BUG_ON(dma_len < 0); | |
401 | sg = sg_next(sg); | |
402 | dma_addr = sg_dma_address(sg); | |
403 | dma_len = sg_dma_len(sg); | |
ff22b54f MW |
404 | } |
405 | ||
eca18b23 | 406 | return total_len; |
ff22b54f MW |
407 | } |
408 | ||
427e9708 KB |
409 | struct nvme_bio_pair { |
410 | struct bio b1, b2, *parent; | |
411 | struct bio_vec *bv1, *bv2; | |
412 | int err; | |
413 | atomic_t cnt; | |
414 | }; | |
415 | ||
416 | static void nvme_bio_pair_endio(struct bio *bio, int err) | |
417 | { | |
418 | struct nvme_bio_pair *bp = bio->bi_private; | |
419 | ||
420 | if (err) | |
421 | bp->err = err; | |
422 | ||
423 | if (atomic_dec_and_test(&bp->cnt)) { | |
424 | bio_endio(bp->parent, bp->err); | |
425 | if (bp->bv1) | |
426 | kfree(bp->bv1); | |
427 | if (bp->bv2) | |
428 | kfree(bp->bv2); | |
429 | kfree(bp); | |
430 | } | |
431 | } | |
432 | ||
433 | static struct nvme_bio_pair *nvme_bio_split(struct bio *bio, int idx, | |
434 | int len, int offset) | |
435 | { | |
436 | struct nvme_bio_pair *bp; | |
437 | ||
438 | BUG_ON(len > bio->bi_size); | |
439 | BUG_ON(idx > bio->bi_vcnt); | |
440 | ||
441 | bp = kmalloc(sizeof(*bp), GFP_ATOMIC); | |
442 | if (!bp) | |
443 | return NULL; | |
444 | bp->err = 0; | |
445 | ||
446 | bp->b1 = *bio; | |
447 | bp->b2 = *bio; | |
448 | ||
449 | bp->b1.bi_size = len; | |
450 | bp->b2.bi_size -= len; | |
451 | bp->b1.bi_vcnt = idx; | |
452 | bp->b2.bi_idx = idx; | |
453 | bp->b2.bi_sector += len >> 9; | |
454 | ||
455 | if (offset) { | |
456 | bp->bv1 = kmalloc(bio->bi_max_vecs * sizeof(struct bio_vec), | |
457 | GFP_ATOMIC); | |
458 | if (!bp->bv1) | |
459 | goto split_fail_1; | |
460 | ||
461 | bp->bv2 = kmalloc(bio->bi_max_vecs * sizeof(struct bio_vec), | |
462 | GFP_ATOMIC); | |
463 | if (!bp->bv2) | |
464 | goto split_fail_2; | |
465 | ||
466 | memcpy(bp->bv1, bio->bi_io_vec, | |
467 | bio->bi_max_vecs * sizeof(struct bio_vec)); | |
468 | memcpy(bp->bv2, bio->bi_io_vec, | |
469 | bio->bi_max_vecs * sizeof(struct bio_vec)); | |
470 | ||
471 | bp->b1.bi_io_vec = bp->bv1; | |
472 | bp->b2.bi_io_vec = bp->bv2; | |
473 | bp->b2.bi_io_vec[idx].bv_offset += offset; | |
474 | bp->b2.bi_io_vec[idx].bv_len -= offset; | |
475 | bp->b1.bi_io_vec[idx].bv_len = offset; | |
476 | bp->b1.bi_vcnt++; | |
477 | } else | |
478 | bp->bv1 = bp->bv2 = NULL; | |
479 | ||
480 | bp->b1.bi_private = bp; | |
481 | bp->b2.bi_private = bp; | |
482 | ||
483 | bp->b1.bi_end_io = nvme_bio_pair_endio; | |
484 | bp->b2.bi_end_io = nvme_bio_pair_endio; | |
485 | ||
486 | bp->parent = bio; | |
487 | atomic_set(&bp->cnt, 2); | |
488 | ||
489 | return bp; | |
490 | ||
491 | split_fail_2: | |
492 | kfree(bp->bv1); | |
493 | split_fail_1: | |
494 | kfree(bp); | |
495 | return NULL; | |
496 | } | |
497 | ||
498 | static int nvme_split_and_submit(struct bio *bio, struct nvme_queue *nvmeq, | |
499 | int idx, int len, int offset) | |
500 | { | |
501 | struct nvme_bio_pair *bp = nvme_bio_split(bio, idx, len, offset); | |
502 | if (!bp) | |
503 | return -ENOMEM; | |
504 | ||
505 | if (bio_list_empty(&nvmeq->sq_cong)) | |
506 | add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait); | |
507 | bio_list_add(&nvmeq->sq_cong, &bp->b1); | |
508 | bio_list_add(&nvmeq->sq_cong, &bp->b2); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
1ad2f893 MW |
513 | /* NVMe scatterlists require no holes in the virtual address */ |
514 | #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \ | |
515 | (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE)) | |
516 | ||
427e9708 | 517 | static int nvme_map_bio(struct nvme_queue *nvmeq, struct nvme_iod *iod, |
b60503ba MW |
518 | struct bio *bio, enum dma_data_direction dma_dir, int psegs) |
519 | { | |
76830840 MW |
520 | struct bio_vec *bvec, *bvprv = NULL; |
521 | struct scatterlist *sg = NULL; | |
159b67d7 KB |
522 | int i, length = 0, nsegs = 0, split_len = bio->bi_size; |
523 | ||
524 | if (nvmeq->dev->stripe_size) | |
525 | split_len = nvmeq->dev->stripe_size - | |
526 | ((bio->bi_sector << 9) & (nvmeq->dev->stripe_size - 1)); | |
b60503ba | 527 | |
eca18b23 | 528 | sg_init_table(iod->sg, psegs); |
b60503ba | 529 | bio_for_each_segment(bvec, bio, i) { |
76830840 MW |
530 | if (bvprv && BIOVEC_PHYS_MERGEABLE(bvprv, bvec)) { |
531 | sg->length += bvec->bv_len; | |
532 | } else { | |
1ad2f893 | 533 | if (bvprv && BIOVEC_NOT_VIRT_MERGEABLE(bvprv, bvec)) |
427e9708 KB |
534 | return nvme_split_and_submit(bio, nvmeq, i, |
535 | length, 0); | |
536 | ||
eca18b23 | 537 | sg = sg ? sg + 1 : iod->sg; |
76830840 MW |
538 | sg_set_page(sg, bvec->bv_page, bvec->bv_len, |
539 | bvec->bv_offset); | |
540 | nsegs++; | |
541 | } | |
159b67d7 KB |
542 | |
543 | if (split_len - length < bvec->bv_len) | |
544 | return nvme_split_and_submit(bio, nvmeq, i, split_len, | |
545 | split_len - length); | |
1ad2f893 | 546 | length += bvec->bv_len; |
76830840 | 547 | bvprv = bvec; |
b60503ba | 548 | } |
eca18b23 | 549 | iod->nents = nsegs; |
76830840 | 550 | sg_mark_end(sg); |
427e9708 | 551 | if (dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir) == 0) |
1ad2f893 | 552 | return -ENOMEM; |
427e9708 | 553 | |
159b67d7 | 554 | BUG_ON(length != bio->bi_size); |
1ad2f893 | 555 | return length; |
b60503ba MW |
556 | } |
557 | ||
0e5e4f0e KB |
558 | /* |
559 | * We reuse the small pool to allocate the 16-byte range here as it is not | |
560 | * worth having a special pool for these or additional cases to handle freeing | |
561 | * the iod. | |
562 | */ | |
563 | static int nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, | |
564 | struct bio *bio, struct nvme_iod *iod, int cmdid) | |
565 | { | |
566 | struct nvme_dsm_range *range; | |
567 | struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; | |
568 | ||
569 | range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC, | |
570 | &iod->first_dma); | |
571 | if (!range) | |
572 | return -ENOMEM; | |
573 | ||
574 | iod_list(iod)[0] = (__le64 *)range; | |
575 | iod->npages = 0; | |
576 | ||
577 | range->cattr = cpu_to_le32(0); | |
578 | range->nlb = cpu_to_le32(bio->bi_size >> ns->lba_shift); | |
063cc6d5 | 579 | range->slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_sector)); |
0e5e4f0e KB |
580 | |
581 | memset(cmnd, 0, sizeof(*cmnd)); | |
582 | cmnd->dsm.opcode = nvme_cmd_dsm; | |
583 | cmnd->dsm.command_id = cmdid; | |
584 | cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); | |
585 | cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma); | |
586 | cmnd->dsm.nr = 0; | |
587 | cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); | |
588 | ||
589 | if (++nvmeq->sq_tail == nvmeq->q_depth) | |
590 | nvmeq->sq_tail = 0; | |
591 | writel(nvmeq->sq_tail, nvmeq->q_db); | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
00df5cb4 MW |
596 | static int nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns, |
597 | int cmdid) | |
598 | { | |
599 | struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; | |
600 | ||
601 | memset(cmnd, 0, sizeof(*cmnd)); | |
602 | cmnd->common.opcode = nvme_cmd_flush; | |
603 | cmnd->common.command_id = cmdid; | |
604 | cmnd->common.nsid = cpu_to_le32(ns->ns_id); | |
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 | ||
5d0f6131 | 613 | int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns) |
00df5cb4 MW |
614 | { |
615 | int cmdid = alloc_cmdid(nvmeq, (void *)CMD_CTX_FLUSH, | |
ff976d72 | 616 | special_completion, NVME_IO_TIMEOUT); |
00df5cb4 MW |
617 | if (unlikely(cmdid < 0)) |
618 | return cmdid; | |
619 | ||
620 | return nvme_submit_flush(nvmeq, ns, cmdid); | |
621 | } | |
622 | ||
184d2944 MW |
623 | /* |
624 | * Called with local interrupts disabled and the q_lock held. May not sleep. | |
625 | */ | |
b60503ba MW |
626 | static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns, |
627 | struct bio *bio) | |
628 | { | |
ff22b54f | 629 | struct nvme_command *cmnd; |
eca18b23 | 630 | struct nvme_iod *iod; |
b60503ba | 631 | enum dma_data_direction dma_dir; |
1287dabd | 632 | int cmdid, length, result; |
b60503ba MW |
633 | u16 control; |
634 | u32 dsmgmt; | |
b60503ba MW |
635 | int psegs = bio_phys_segments(ns->queue, bio); |
636 | ||
00df5cb4 MW |
637 | if ((bio->bi_rw & REQ_FLUSH) && psegs) { |
638 | result = nvme_submit_flush_data(nvmeq, ns); | |
639 | if (result) | |
640 | return result; | |
641 | } | |
642 | ||
1287dabd | 643 | result = -ENOMEM; |
eca18b23 MW |
644 | iod = nvme_alloc_iod(psegs, bio->bi_size, GFP_ATOMIC); |
645 | if (!iod) | |
eeee3226 | 646 | goto nomem; |
eca18b23 | 647 | iod->private = bio; |
b60503ba | 648 | |
eeee3226 | 649 | result = -EBUSY; |
ff976d72 | 650 | cmdid = alloc_cmdid(nvmeq, iod, bio_completion, NVME_IO_TIMEOUT); |
b60503ba | 651 | if (unlikely(cmdid < 0)) |
eca18b23 | 652 | goto free_iod; |
b60503ba | 653 | |
0e5e4f0e KB |
654 | if (bio->bi_rw & REQ_DISCARD) { |
655 | result = nvme_submit_discard(nvmeq, ns, bio, iod, cmdid); | |
656 | if (result) | |
657 | goto free_cmdid; | |
658 | return result; | |
659 | } | |
00df5cb4 MW |
660 | if ((bio->bi_rw & REQ_FLUSH) && !psegs) |
661 | return nvme_submit_flush(nvmeq, ns, cmdid); | |
662 | ||
b60503ba MW |
663 | control = 0; |
664 | if (bio->bi_rw & REQ_FUA) | |
665 | control |= NVME_RW_FUA; | |
666 | if (bio->bi_rw & (REQ_FAILFAST_DEV | REQ_RAHEAD)) | |
667 | control |= NVME_RW_LR; | |
668 | ||
669 | dsmgmt = 0; | |
670 | if (bio->bi_rw & REQ_RAHEAD) | |
671 | dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; | |
672 | ||
ff22b54f | 673 | cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; |
b60503ba | 674 | |
b8deb62c | 675 | memset(cmnd, 0, sizeof(*cmnd)); |
b60503ba | 676 | if (bio_data_dir(bio)) { |
ff22b54f | 677 | cmnd->rw.opcode = nvme_cmd_write; |
b60503ba MW |
678 | dma_dir = DMA_TO_DEVICE; |
679 | } else { | |
ff22b54f | 680 | cmnd->rw.opcode = nvme_cmd_read; |
b60503ba MW |
681 | dma_dir = DMA_FROM_DEVICE; |
682 | } | |
683 | ||
427e9708 KB |
684 | result = nvme_map_bio(nvmeq, iod, bio, dma_dir, psegs); |
685 | if (result <= 0) | |
859361a2 | 686 | goto free_cmdid; |
1ad2f893 | 687 | length = result; |
b60503ba | 688 | |
ff22b54f MW |
689 | cmnd->rw.command_id = cmdid; |
690 | cmnd->rw.nsid = cpu_to_le32(ns->ns_id); | |
eca18b23 MW |
691 | length = nvme_setup_prps(nvmeq->dev, &cmnd->common, iod, length, |
692 | GFP_ATOMIC); | |
063cc6d5 | 693 | cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, bio->bi_sector)); |
1ad2f893 | 694 | cmnd->rw.length = cpu_to_le16((length >> ns->lba_shift) - 1); |
ff22b54f MW |
695 | cmnd->rw.control = cpu_to_le16(control); |
696 | cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); | |
b60503ba | 697 | |
b60503ba MW |
698 | if (++nvmeq->sq_tail == nvmeq->q_depth) |
699 | nvmeq->sq_tail = 0; | |
7547881d | 700 | writel(nvmeq->sq_tail, nvmeq->q_db); |
b60503ba | 701 | |
1974b1ae MW |
702 | return 0; |
703 | ||
859361a2 KB |
704 | free_cmdid: |
705 | free_cmdid(nvmeq, cmdid, NULL); | |
eca18b23 MW |
706 | free_iod: |
707 | nvme_free_iod(nvmeq->dev, iod); | |
eeee3226 MW |
708 | nomem: |
709 | return result; | |
b60503ba MW |
710 | } |
711 | ||
93c3d65b | 712 | static void nvme_make_request(struct request_queue *q, struct bio *bio) |
b60503ba MW |
713 | { |
714 | struct nvme_ns *ns = q->queuedata; | |
040a93b5 | 715 | struct nvme_queue *nvmeq = get_nvmeq(ns->dev); |
eeee3226 MW |
716 | int result = -EBUSY; |
717 | ||
718 | spin_lock_irq(&nvmeq->q_lock); | |
719 | if (bio_list_empty(&nvmeq->sq_cong)) | |
720 | result = nvme_submit_bio_queue(nvmeq, ns, bio); | |
721 | if (unlikely(result)) { | |
722 | if (bio_list_empty(&nvmeq->sq_cong)) | |
723 | add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait); | |
b60503ba MW |
724 | bio_list_add(&nvmeq->sq_cong, bio); |
725 | } | |
eeee3226 MW |
726 | |
727 | spin_unlock_irq(&nvmeq->q_lock); | |
b60503ba | 728 | put_nvmeq(nvmeq); |
b60503ba MW |
729 | } |
730 | ||
b60503ba MW |
731 | static irqreturn_t nvme_process_cq(struct nvme_queue *nvmeq) |
732 | { | |
82123460 | 733 | u16 head, phase; |
b60503ba | 734 | |
b60503ba | 735 | head = nvmeq->cq_head; |
82123460 | 736 | phase = nvmeq->cq_phase; |
b60503ba MW |
737 | |
738 | for (;;) { | |
c2f5b650 MW |
739 | void *ctx; |
740 | nvme_completion_fn fn; | |
b60503ba | 741 | struct nvme_completion cqe = nvmeq->cqes[head]; |
82123460 | 742 | if ((le16_to_cpu(cqe.status) & 1) != phase) |
b60503ba MW |
743 | break; |
744 | nvmeq->sq_head = le16_to_cpu(cqe.sq_head); | |
745 | if (++head == nvmeq->q_depth) { | |
746 | head = 0; | |
82123460 | 747 | phase = !phase; |
b60503ba MW |
748 | } |
749 | ||
c2f5b650 | 750 | ctx = free_cmdid(nvmeq, cqe.command_id, &fn); |
5c1281a3 | 751 | fn(nvmeq->dev, ctx, &cqe); |
b60503ba MW |
752 | } |
753 | ||
754 | /* If the controller ignores the cq head doorbell and continuously | |
755 | * writes to the queue, it is theoretically possible to wrap around | |
756 | * the queue twice and mistakenly return IRQ_NONE. Linux only | |
757 | * requires that 0.1% of your interrupts are handled, so this isn't | |
758 | * a big problem. | |
759 | */ | |
82123460 | 760 | if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) |
b60503ba MW |
761 | return IRQ_NONE; |
762 | ||
f1938f6e | 763 | writel(head, nvmeq->q_db + (1 << nvmeq->dev->db_stride)); |
b60503ba | 764 | nvmeq->cq_head = head; |
82123460 | 765 | nvmeq->cq_phase = phase; |
b60503ba MW |
766 | |
767 | return IRQ_HANDLED; | |
768 | } | |
769 | ||
770 | static irqreturn_t nvme_irq(int irq, void *data) | |
58ffacb5 MW |
771 | { |
772 | irqreturn_t result; | |
773 | struct nvme_queue *nvmeq = data; | |
774 | spin_lock(&nvmeq->q_lock); | |
775 | result = nvme_process_cq(nvmeq); | |
776 | spin_unlock(&nvmeq->q_lock); | |
777 | return result; | |
778 | } | |
779 | ||
780 | static irqreturn_t nvme_irq_check(int irq, void *data) | |
781 | { | |
782 | struct nvme_queue *nvmeq = data; | |
783 | struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; | |
784 | if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) | |
785 | return IRQ_NONE; | |
786 | return IRQ_WAKE_THREAD; | |
787 | } | |
788 | ||
3c0cf138 MW |
789 | static void nvme_abort_command(struct nvme_queue *nvmeq, int cmdid) |
790 | { | |
791 | spin_lock_irq(&nvmeq->q_lock); | |
c2f5b650 | 792 | cancel_cmdid(nvmeq, cmdid, NULL); |
3c0cf138 MW |
793 | spin_unlock_irq(&nvmeq->q_lock); |
794 | } | |
795 | ||
c2f5b650 MW |
796 | struct sync_cmd_info { |
797 | struct task_struct *task; | |
798 | u32 result; | |
799 | int status; | |
800 | }; | |
801 | ||
5c1281a3 | 802 | static void sync_completion(struct nvme_dev *dev, void *ctx, |
c2f5b650 MW |
803 | struct nvme_completion *cqe) |
804 | { | |
805 | struct sync_cmd_info *cmdinfo = ctx; | |
806 | cmdinfo->result = le32_to_cpup(&cqe->result); | |
807 | cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; | |
808 | wake_up_process(cmdinfo->task); | |
809 | } | |
810 | ||
b60503ba MW |
811 | /* |
812 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
813 | * if the result is positive, it's an NVM Express status code | |
814 | */ | |
5d0f6131 VV |
815 | int nvme_submit_sync_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd, |
816 | u32 *result, unsigned timeout) | |
b60503ba MW |
817 | { |
818 | int cmdid; | |
819 | struct sync_cmd_info cmdinfo; | |
820 | ||
821 | cmdinfo.task = current; | |
822 | cmdinfo.status = -EINTR; | |
823 | ||
c2f5b650 | 824 | cmdid = alloc_cmdid_killable(nvmeq, &cmdinfo, sync_completion, |
e85248e5 | 825 | timeout); |
b60503ba MW |
826 | if (cmdid < 0) |
827 | return cmdid; | |
828 | cmd->common.command_id = cmdid; | |
829 | ||
3c0cf138 MW |
830 | set_current_state(TASK_KILLABLE); |
831 | nvme_submit_cmd(nvmeq, cmd); | |
78f8d257 | 832 | schedule_timeout(timeout); |
b60503ba | 833 | |
3c0cf138 MW |
834 | if (cmdinfo.status == -EINTR) { |
835 | nvme_abort_command(nvmeq, cmdid); | |
836 | return -EINTR; | |
837 | } | |
838 | ||
b60503ba MW |
839 | if (result) |
840 | *result = cmdinfo.result; | |
841 | ||
842 | return cmdinfo.status; | |
843 | } | |
844 | ||
5d0f6131 | 845 | int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd, |
b60503ba MW |
846 | u32 *result) |
847 | { | |
e85248e5 | 848 | return nvme_submit_sync_cmd(dev->queues[0], cmd, result, ADMIN_TIMEOUT); |
b60503ba MW |
849 | } |
850 | ||
851 | static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) | |
852 | { | |
853 | int status; | |
854 | struct nvme_command c; | |
855 | ||
856 | memset(&c, 0, sizeof(c)); | |
857 | c.delete_queue.opcode = opcode; | |
858 | c.delete_queue.qid = cpu_to_le16(id); | |
859 | ||
860 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
861 | if (status) | |
862 | return -EIO; | |
863 | return 0; | |
864 | } | |
865 | ||
866 | static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, | |
867 | struct nvme_queue *nvmeq) | |
868 | { | |
869 | int status; | |
870 | struct nvme_command c; | |
871 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; | |
872 | ||
873 | memset(&c, 0, sizeof(c)); | |
874 | c.create_cq.opcode = nvme_admin_create_cq; | |
875 | c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); | |
876 | c.create_cq.cqid = cpu_to_le16(qid); | |
877 | c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
878 | c.create_cq.cq_flags = cpu_to_le16(flags); | |
879 | c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); | |
880 | ||
881 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
882 | if (status) | |
883 | return -EIO; | |
884 | return 0; | |
885 | } | |
886 | ||
887 | static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, | |
888 | struct nvme_queue *nvmeq) | |
889 | { | |
890 | int status; | |
891 | struct nvme_command c; | |
892 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; | |
893 | ||
894 | memset(&c, 0, sizeof(c)); | |
895 | c.create_sq.opcode = nvme_admin_create_sq; | |
896 | c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); | |
897 | c.create_sq.sqid = cpu_to_le16(qid); | |
898 | c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
899 | c.create_sq.sq_flags = cpu_to_le16(flags); | |
900 | c.create_sq.cqid = cpu_to_le16(qid); | |
901 | ||
902 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
903 | if (status) | |
904 | return -EIO; | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) | |
909 | { | |
910 | return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); | |
911 | } | |
912 | ||
913 | static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) | |
914 | { | |
915 | return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); | |
916 | } | |
917 | ||
5d0f6131 | 918 | int nvme_identify(struct nvme_dev *dev, unsigned nsid, unsigned cns, |
bc5fc7e4 MW |
919 | dma_addr_t dma_addr) |
920 | { | |
921 | struct nvme_command c; | |
922 | ||
923 | memset(&c, 0, sizeof(c)); | |
924 | c.identify.opcode = nvme_admin_identify; | |
925 | c.identify.nsid = cpu_to_le32(nsid); | |
926 | c.identify.prp1 = cpu_to_le64(dma_addr); | |
927 | c.identify.cns = cpu_to_le32(cns); | |
928 | ||
929 | return nvme_submit_admin_cmd(dev, &c, NULL); | |
930 | } | |
931 | ||
5d0f6131 | 932 | int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, |
08df1e05 | 933 | dma_addr_t dma_addr, u32 *result) |
bc5fc7e4 MW |
934 | { |
935 | struct nvme_command c; | |
936 | ||
937 | memset(&c, 0, sizeof(c)); | |
938 | c.features.opcode = nvme_admin_get_features; | |
a42cecce | 939 | c.features.nsid = cpu_to_le32(nsid); |
bc5fc7e4 MW |
940 | c.features.prp1 = cpu_to_le64(dma_addr); |
941 | c.features.fid = cpu_to_le32(fid); | |
bc5fc7e4 | 942 | |
08df1e05 | 943 | return nvme_submit_admin_cmd(dev, &c, result); |
df348139 MW |
944 | } |
945 | ||
5d0f6131 VV |
946 | int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, |
947 | dma_addr_t dma_addr, u32 *result) | |
df348139 MW |
948 | { |
949 | struct nvme_command c; | |
950 | ||
951 | memset(&c, 0, sizeof(c)); | |
952 | c.features.opcode = nvme_admin_set_features; | |
953 | c.features.prp1 = cpu_to_le64(dma_addr); | |
954 | c.features.fid = cpu_to_le32(fid); | |
955 | c.features.dword11 = cpu_to_le32(dword11); | |
956 | ||
bc5fc7e4 MW |
957 | return nvme_submit_admin_cmd(dev, &c, result); |
958 | } | |
959 | ||
a09115b2 MW |
960 | /** |
961 | * nvme_cancel_ios - Cancel outstanding I/Os | |
962 | * @queue: The queue to cancel I/Os on | |
963 | * @timeout: True to only cancel I/Os which have timed out | |
964 | */ | |
965 | static void nvme_cancel_ios(struct nvme_queue *nvmeq, bool timeout) | |
966 | { | |
967 | int depth = nvmeq->q_depth - 1; | |
968 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); | |
969 | unsigned long now = jiffies; | |
970 | int cmdid; | |
971 | ||
972 | for_each_set_bit(cmdid, nvmeq->cmdid_data, depth) { | |
973 | void *ctx; | |
974 | nvme_completion_fn fn; | |
975 | static struct nvme_completion cqe = { | |
af2d9ca7 | 976 | .status = cpu_to_le16(NVME_SC_ABORT_REQ << 1), |
a09115b2 MW |
977 | }; |
978 | ||
979 | if (timeout && !time_after(now, info[cmdid].timeout)) | |
980 | continue; | |
053ab702 KB |
981 | if (info[cmdid].ctx == CMD_CTX_CANCELLED) |
982 | continue; | |
a09115b2 MW |
983 | dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d\n", cmdid); |
984 | ctx = cancel_cmdid(nvmeq, cmdid, &fn); | |
985 | fn(nvmeq->dev, ctx, &cqe); | |
986 | } | |
987 | } | |
988 | ||
9e866774 MW |
989 | static void nvme_free_queue_mem(struct nvme_queue *nvmeq) |
990 | { | |
991 | dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), | |
992 | (void *)nvmeq->cqes, nvmeq->cq_dma_addr); | |
993 | dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), | |
994 | nvmeq->sq_cmds, nvmeq->sq_dma_addr); | |
995 | kfree(nvmeq); | |
996 | } | |
997 | ||
b60503ba MW |
998 | static void nvme_free_queue(struct nvme_dev *dev, int qid) |
999 | { | |
1000 | struct nvme_queue *nvmeq = dev->queues[qid]; | |
aba2080f | 1001 | int vector = dev->entry[nvmeq->cq_vector].vector; |
b60503ba | 1002 | |
a09115b2 MW |
1003 | spin_lock_irq(&nvmeq->q_lock); |
1004 | nvme_cancel_ios(nvmeq, false); | |
3295874b KB |
1005 | while (bio_list_peek(&nvmeq->sq_cong)) { |
1006 | struct bio *bio = bio_list_pop(&nvmeq->sq_cong); | |
1007 | bio_endio(bio, -EIO); | |
1008 | } | |
a09115b2 MW |
1009 | spin_unlock_irq(&nvmeq->q_lock); |
1010 | ||
aba2080f MW |
1011 | irq_set_affinity_hint(vector, NULL); |
1012 | free_irq(vector, nvmeq); | |
b60503ba MW |
1013 | |
1014 | /* Don't tell the adapter to delete the admin queue */ | |
1015 | if (qid) { | |
1016 | adapter_delete_sq(dev, qid); | |
1017 | adapter_delete_cq(dev, qid); | |
1018 | } | |
1019 | ||
9e866774 | 1020 | nvme_free_queue_mem(nvmeq); |
b60503ba MW |
1021 | } |
1022 | ||
1023 | static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, | |
1024 | int depth, int vector) | |
1025 | { | |
1026 | struct device *dmadev = &dev->pci_dev->dev; | |
a0cadb85 KB |
1027 | unsigned extra = DIV_ROUND_UP(depth, 8) + (depth * |
1028 | sizeof(struct nvme_cmd_info)); | |
b60503ba MW |
1029 | struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL); |
1030 | if (!nvmeq) | |
1031 | return NULL; | |
1032 | ||
1033 | nvmeq->cqes = dma_alloc_coherent(dmadev, CQ_SIZE(depth), | |
1034 | &nvmeq->cq_dma_addr, GFP_KERNEL); | |
1035 | if (!nvmeq->cqes) | |
1036 | goto free_nvmeq; | |
1037 | memset((void *)nvmeq->cqes, 0, CQ_SIZE(depth)); | |
1038 | ||
1039 | nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth), | |
1040 | &nvmeq->sq_dma_addr, GFP_KERNEL); | |
1041 | if (!nvmeq->sq_cmds) | |
1042 | goto free_cqdma; | |
1043 | ||
1044 | nvmeq->q_dmadev = dmadev; | |
091b6092 | 1045 | nvmeq->dev = dev; |
b60503ba MW |
1046 | spin_lock_init(&nvmeq->q_lock); |
1047 | nvmeq->cq_head = 0; | |
82123460 | 1048 | nvmeq->cq_phase = 1; |
b60503ba | 1049 | init_waitqueue_head(&nvmeq->sq_full); |
1fa6aead | 1050 | init_waitqueue_entry(&nvmeq->sq_cong_wait, nvme_thread); |
b60503ba | 1051 | bio_list_init(&nvmeq->sq_cong); |
f1938f6e | 1052 | nvmeq->q_db = &dev->dbs[qid << (dev->db_stride + 1)]; |
b60503ba MW |
1053 | nvmeq->q_depth = depth; |
1054 | nvmeq->cq_vector = vector; | |
1055 | ||
1056 | return nvmeq; | |
1057 | ||
1058 | free_cqdma: | |
68b8eca5 | 1059 | dma_free_coherent(dmadev, CQ_SIZE(depth), (void *)nvmeq->cqes, |
b60503ba MW |
1060 | nvmeq->cq_dma_addr); |
1061 | free_nvmeq: | |
1062 | kfree(nvmeq); | |
1063 | return NULL; | |
1064 | } | |
1065 | ||
3001082c MW |
1066 | static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, |
1067 | const char *name) | |
1068 | { | |
58ffacb5 MW |
1069 | if (use_threaded_interrupts) |
1070 | return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, | |
ec6ce618 | 1071 | nvme_irq_check, nvme_irq, |
58ffacb5 MW |
1072 | IRQF_DISABLED | IRQF_SHARED, |
1073 | name, nvmeq); | |
3001082c MW |
1074 | return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, |
1075 | IRQF_DISABLED | IRQF_SHARED, name, nvmeq); | |
1076 | } | |
1077 | ||
8d85fce7 GKH |
1078 | static struct nvme_queue *nvme_create_queue(struct nvme_dev *dev, int qid, |
1079 | int cq_size, int vector) | |
b60503ba MW |
1080 | { |
1081 | int result; | |
1082 | struct nvme_queue *nvmeq = nvme_alloc_queue(dev, qid, cq_size, vector); | |
1083 | ||
3f85d50b | 1084 | if (!nvmeq) |
6f0f5449 | 1085 | return ERR_PTR(-ENOMEM); |
3f85d50b | 1086 | |
b60503ba MW |
1087 | result = adapter_alloc_cq(dev, qid, nvmeq); |
1088 | if (result < 0) | |
1089 | goto free_nvmeq; | |
1090 | ||
1091 | result = adapter_alloc_sq(dev, qid, nvmeq); | |
1092 | if (result < 0) | |
1093 | goto release_cq; | |
1094 | ||
3001082c | 1095 | result = queue_request_irq(dev, nvmeq, "nvme"); |
b60503ba MW |
1096 | if (result < 0) |
1097 | goto release_sq; | |
1098 | ||
1099 | return nvmeq; | |
1100 | ||
1101 | release_sq: | |
1102 | adapter_delete_sq(dev, qid); | |
1103 | release_cq: | |
1104 | adapter_delete_cq(dev, qid); | |
1105 | free_nvmeq: | |
1106 | dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), | |
1107 | (void *)nvmeq->cqes, nvmeq->cq_dma_addr); | |
1108 | dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), | |
1109 | nvmeq->sq_cmds, nvmeq->sq_dma_addr); | |
1110 | kfree(nvmeq); | |
6f0f5449 | 1111 | return ERR_PTR(result); |
b60503ba MW |
1112 | } |
1113 | ||
ba47e386 MW |
1114 | static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled) |
1115 | { | |
1116 | unsigned long timeout; | |
1117 | u32 bit = enabled ? NVME_CSTS_RDY : 0; | |
1118 | ||
1119 | timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; | |
1120 | ||
1121 | while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) { | |
1122 | msleep(100); | |
1123 | if (fatal_signal_pending(current)) | |
1124 | return -EINTR; | |
1125 | if (time_after(jiffies, timeout)) { | |
1126 | dev_err(&dev->pci_dev->dev, | |
1127 | "Device not ready; aborting initialisation\n"); | |
1128 | return -ENODEV; | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * If the device has been passed off to us in an enabled state, just clear | |
1137 | * the enabled bit. The spec says we should set the 'shutdown notification | |
1138 | * bits', but doing so may cause the device to complete commands to the | |
1139 | * admin queue ... and we don't know what memory that might be pointing at! | |
1140 | */ | |
1141 | static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap) | |
1142 | { | |
44af146a MW |
1143 | u32 cc = readl(&dev->bar->cc); |
1144 | ||
1145 | if (cc & NVME_CC_ENABLE) | |
1146 | writel(cc & ~NVME_CC_ENABLE, &dev->bar->cc); | |
ba47e386 MW |
1147 | return nvme_wait_ready(dev, cap, false); |
1148 | } | |
1149 | ||
1150 | static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap) | |
1151 | { | |
1152 | return nvme_wait_ready(dev, cap, true); | |
1153 | } | |
1154 | ||
8d85fce7 | 1155 | static int nvme_configure_admin_queue(struct nvme_dev *dev) |
b60503ba | 1156 | { |
ba47e386 | 1157 | int result; |
b60503ba | 1158 | u32 aqa; |
ba47e386 | 1159 | u64 cap = readq(&dev->bar->cap); |
b60503ba MW |
1160 | struct nvme_queue *nvmeq; |
1161 | ||
1162 | dev->dbs = ((void __iomem *)dev->bar) + 4096; | |
ba47e386 MW |
1163 | dev->db_stride = NVME_CAP_STRIDE(cap); |
1164 | ||
1165 | result = nvme_disable_ctrl(dev, cap); | |
1166 | if (result < 0) | |
1167 | return result; | |
b60503ba MW |
1168 | |
1169 | nvmeq = nvme_alloc_queue(dev, 0, 64, 0); | |
3f85d50b MW |
1170 | if (!nvmeq) |
1171 | return -ENOMEM; | |
b60503ba MW |
1172 | |
1173 | aqa = nvmeq->q_depth - 1; | |
1174 | aqa |= aqa << 16; | |
1175 | ||
1176 | dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM; | |
1177 | dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT; | |
1178 | dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; | |
7f53f9d2 | 1179 | dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; |
b60503ba MW |
1180 | |
1181 | writel(aqa, &dev->bar->aqa); | |
1182 | writeq(nvmeq->sq_dma_addr, &dev->bar->asq); | |
1183 | writeq(nvmeq->cq_dma_addr, &dev->bar->acq); | |
1184 | writel(dev->ctrl_config, &dev->bar->cc); | |
1185 | ||
ba47e386 | 1186 | result = nvme_enable_ctrl(dev, cap); |
025c557a KB |
1187 | if (result) |
1188 | goto free_q; | |
9e866774 | 1189 | |
3001082c | 1190 | result = queue_request_irq(dev, nvmeq, "nvme admin"); |
025c557a KB |
1191 | if (result) |
1192 | goto free_q; | |
1193 | ||
b60503ba MW |
1194 | dev->queues[0] = nvmeq; |
1195 | return result; | |
025c557a KB |
1196 | |
1197 | free_q: | |
1198 | nvme_free_queue_mem(nvmeq); | |
1199 | return result; | |
b60503ba MW |
1200 | } |
1201 | ||
5d0f6131 | 1202 | struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write, |
eca18b23 | 1203 | unsigned long addr, unsigned length) |
b60503ba | 1204 | { |
36c14ed9 | 1205 | int i, err, count, nents, offset; |
7fc3cdab MW |
1206 | struct scatterlist *sg; |
1207 | struct page **pages; | |
eca18b23 | 1208 | struct nvme_iod *iod; |
36c14ed9 MW |
1209 | |
1210 | if (addr & 3) | |
eca18b23 | 1211 | return ERR_PTR(-EINVAL); |
5460fc03 | 1212 | if (!length || length > INT_MAX - PAGE_SIZE) |
eca18b23 | 1213 | return ERR_PTR(-EINVAL); |
7fc3cdab | 1214 | |
36c14ed9 | 1215 | offset = offset_in_page(addr); |
7fc3cdab MW |
1216 | count = DIV_ROUND_UP(offset + length, PAGE_SIZE); |
1217 | pages = kcalloc(count, sizeof(*pages), GFP_KERNEL); | |
22fff826 DC |
1218 | if (!pages) |
1219 | return ERR_PTR(-ENOMEM); | |
36c14ed9 MW |
1220 | |
1221 | err = get_user_pages_fast(addr, count, 1, pages); | |
1222 | if (err < count) { | |
1223 | count = err; | |
1224 | err = -EFAULT; | |
1225 | goto put_pages; | |
1226 | } | |
7fc3cdab | 1227 | |
eca18b23 MW |
1228 | iod = nvme_alloc_iod(count, length, GFP_KERNEL); |
1229 | sg = iod->sg; | |
36c14ed9 | 1230 | sg_init_table(sg, count); |
d0ba1e49 MW |
1231 | for (i = 0; i < count; i++) { |
1232 | sg_set_page(&sg[i], pages[i], | |
5460fc03 DC |
1233 | min_t(unsigned, length, PAGE_SIZE - offset), |
1234 | offset); | |
d0ba1e49 MW |
1235 | length -= (PAGE_SIZE - offset); |
1236 | offset = 0; | |
7fc3cdab | 1237 | } |
fe304c43 | 1238 | sg_mark_end(&sg[i - 1]); |
1c2ad9fa | 1239 | iod->nents = count; |
7fc3cdab MW |
1240 | |
1241 | err = -ENOMEM; | |
1242 | nents = dma_map_sg(&dev->pci_dev->dev, sg, count, | |
1243 | write ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
36c14ed9 | 1244 | if (!nents) |
eca18b23 | 1245 | goto free_iod; |
b60503ba | 1246 | |
7fc3cdab | 1247 | kfree(pages); |
eca18b23 | 1248 | return iod; |
b60503ba | 1249 | |
eca18b23 MW |
1250 | free_iod: |
1251 | kfree(iod); | |
7fc3cdab MW |
1252 | put_pages: |
1253 | for (i = 0; i < count; i++) | |
1254 | put_page(pages[i]); | |
1255 | kfree(pages); | |
eca18b23 | 1256 | return ERR_PTR(err); |
7fc3cdab | 1257 | } |
b60503ba | 1258 | |
5d0f6131 | 1259 | void nvme_unmap_user_pages(struct nvme_dev *dev, int write, |
1c2ad9fa | 1260 | struct nvme_iod *iod) |
7fc3cdab | 1261 | { |
1c2ad9fa | 1262 | int i; |
b60503ba | 1263 | |
1c2ad9fa MW |
1264 | dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents, |
1265 | write ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
7fc3cdab | 1266 | |
1c2ad9fa MW |
1267 | for (i = 0; i < iod->nents; i++) |
1268 | put_page(sg_page(&iod->sg[i])); | |
7fc3cdab | 1269 | } |
b60503ba | 1270 | |
a53295b6 MW |
1271 | static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) |
1272 | { | |
1273 | struct nvme_dev *dev = ns->dev; | |
1274 | struct nvme_queue *nvmeq; | |
1275 | struct nvme_user_io io; | |
1276 | struct nvme_command c; | |
f410c680 KB |
1277 | unsigned length, meta_len; |
1278 | int status, i; | |
1279 | struct nvme_iod *iod, *meta_iod = NULL; | |
1280 | dma_addr_t meta_dma_addr; | |
1281 | void *meta, *uninitialized_var(meta_mem); | |
a53295b6 MW |
1282 | |
1283 | if (copy_from_user(&io, uio, sizeof(io))) | |
1284 | return -EFAULT; | |
6c7d4945 | 1285 | length = (io.nblocks + 1) << ns->lba_shift; |
f410c680 KB |
1286 | meta_len = (io.nblocks + 1) * ns->ms; |
1287 | ||
1288 | if (meta_len && ((io.metadata & 3) || !io.metadata)) | |
1289 | return -EINVAL; | |
6c7d4945 MW |
1290 | |
1291 | switch (io.opcode) { | |
1292 | case nvme_cmd_write: | |
1293 | case nvme_cmd_read: | |
6bbf1acd | 1294 | case nvme_cmd_compare: |
eca18b23 | 1295 | iod = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length); |
6413214c | 1296 | break; |
6c7d4945 | 1297 | default: |
6bbf1acd | 1298 | return -EINVAL; |
6c7d4945 MW |
1299 | } |
1300 | ||
eca18b23 MW |
1301 | if (IS_ERR(iod)) |
1302 | return PTR_ERR(iod); | |
a53295b6 MW |
1303 | |
1304 | memset(&c, 0, sizeof(c)); | |
1305 | c.rw.opcode = io.opcode; | |
1306 | c.rw.flags = io.flags; | |
6c7d4945 | 1307 | c.rw.nsid = cpu_to_le32(ns->ns_id); |
a53295b6 | 1308 | c.rw.slba = cpu_to_le64(io.slba); |
6c7d4945 | 1309 | c.rw.length = cpu_to_le16(io.nblocks); |
a53295b6 | 1310 | c.rw.control = cpu_to_le16(io.control); |
1c9b5265 MW |
1311 | c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); |
1312 | c.rw.reftag = cpu_to_le32(io.reftag); | |
1313 | c.rw.apptag = cpu_to_le16(io.apptag); | |
1314 | c.rw.appmask = cpu_to_le16(io.appmask); | |
f410c680 KB |
1315 | |
1316 | if (meta_len) { | |
1317 | meta_iod = nvme_map_user_pages(dev, io.opcode & 1, io.metadata, meta_len); | |
1318 | if (IS_ERR(meta_iod)) { | |
1319 | status = PTR_ERR(meta_iod); | |
1320 | meta_iod = NULL; | |
1321 | goto unmap; | |
1322 | } | |
1323 | ||
1324 | meta_mem = dma_alloc_coherent(&dev->pci_dev->dev, meta_len, | |
1325 | &meta_dma_addr, GFP_KERNEL); | |
1326 | if (!meta_mem) { | |
1327 | status = -ENOMEM; | |
1328 | goto unmap; | |
1329 | } | |
1330 | ||
1331 | if (io.opcode & 1) { | |
1332 | int meta_offset = 0; | |
1333 | ||
1334 | for (i = 0; i < meta_iod->nents; i++) { | |
1335 | meta = kmap_atomic(sg_page(&meta_iod->sg[i])) + | |
1336 | meta_iod->sg[i].offset; | |
1337 | memcpy(meta_mem + meta_offset, meta, | |
1338 | meta_iod->sg[i].length); | |
1339 | kunmap_atomic(meta); | |
1340 | meta_offset += meta_iod->sg[i].length; | |
1341 | } | |
1342 | } | |
1343 | ||
1344 | c.rw.metadata = cpu_to_le64(meta_dma_addr); | |
1345 | } | |
1346 | ||
eca18b23 | 1347 | length = nvme_setup_prps(dev, &c.common, iod, length, GFP_KERNEL); |
a53295b6 | 1348 | |
040a93b5 | 1349 | nvmeq = get_nvmeq(dev); |
fa922821 MW |
1350 | /* |
1351 | * Since nvme_submit_sync_cmd sleeps, we can't keep preemption | |
b1ad37ef MW |
1352 | * disabled. We may be preempted at any point, and be rescheduled |
1353 | * to a different CPU. That will cause cacheline bouncing, but no | |
1354 | * additional races since q_lock already protects against other CPUs. | |
1355 | */ | |
a53295b6 | 1356 | put_nvmeq(nvmeq); |
b77954cb MW |
1357 | if (length != (io.nblocks + 1) << ns->lba_shift) |
1358 | status = -ENOMEM; | |
1359 | else | |
ff976d72 | 1360 | status = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT); |
a53295b6 | 1361 | |
f410c680 KB |
1362 | if (meta_len) { |
1363 | if (status == NVME_SC_SUCCESS && !(io.opcode & 1)) { | |
1364 | int meta_offset = 0; | |
1365 | ||
1366 | for (i = 0; i < meta_iod->nents; i++) { | |
1367 | meta = kmap_atomic(sg_page(&meta_iod->sg[i])) + | |
1368 | meta_iod->sg[i].offset; | |
1369 | memcpy(meta, meta_mem + meta_offset, | |
1370 | meta_iod->sg[i].length); | |
1371 | kunmap_atomic(meta); | |
1372 | meta_offset += meta_iod->sg[i].length; | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | dma_free_coherent(&dev->pci_dev->dev, meta_len, meta_mem, | |
1377 | meta_dma_addr); | |
1378 | } | |
1379 | ||
1380 | unmap: | |
1c2ad9fa | 1381 | nvme_unmap_user_pages(dev, io.opcode & 1, iod); |
eca18b23 | 1382 | nvme_free_iod(dev, iod); |
f410c680 KB |
1383 | |
1384 | if (meta_iod) { | |
1385 | nvme_unmap_user_pages(dev, io.opcode & 1, meta_iod); | |
1386 | nvme_free_iod(dev, meta_iod); | |
1387 | } | |
1388 | ||
a53295b6 MW |
1389 | return status; |
1390 | } | |
1391 | ||
50af8bae | 1392 | static int nvme_user_admin_cmd(struct nvme_dev *dev, |
6bbf1acd | 1393 | struct nvme_admin_cmd __user *ucmd) |
6ee44cdc | 1394 | { |
6bbf1acd | 1395 | struct nvme_admin_cmd cmd; |
6ee44cdc | 1396 | struct nvme_command c; |
eca18b23 | 1397 | int status, length; |
c7d36ab8 | 1398 | struct nvme_iod *uninitialized_var(iod); |
94f370ca | 1399 | unsigned timeout; |
6ee44cdc | 1400 | |
6bbf1acd MW |
1401 | if (!capable(CAP_SYS_ADMIN)) |
1402 | return -EACCES; | |
1403 | if (copy_from_user(&cmd, ucmd, sizeof(cmd))) | |
6ee44cdc | 1404 | return -EFAULT; |
6ee44cdc MW |
1405 | |
1406 | memset(&c, 0, sizeof(c)); | |
6bbf1acd MW |
1407 | c.common.opcode = cmd.opcode; |
1408 | c.common.flags = cmd.flags; | |
1409 | c.common.nsid = cpu_to_le32(cmd.nsid); | |
1410 | c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); | |
1411 | c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); | |
1412 | c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); | |
1413 | c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); | |
1414 | c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); | |
1415 | c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); | |
1416 | c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); | |
1417 | c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); | |
1418 | ||
1419 | length = cmd.data_len; | |
1420 | if (cmd.data_len) { | |
49742188 MW |
1421 | iod = nvme_map_user_pages(dev, cmd.opcode & 1, cmd.addr, |
1422 | length); | |
eca18b23 MW |
1423 | if (IS_ERR(iod)) |
1424 | return PTR_ERR(iod); | |
1425 | length = nvme_setup_prps(dev, &c.common, iod, length, | |
1426 | GFP_KERNEL); | |
6bbf1acd MW |
1427 | } |
1428 | ||
94f370ca KB |
1429 | timeout = cmd.timeout_ms ? msecs_to_jiffies(cmd.timeout_ms) : |
1430 | ADMIN_TIMEOUT; | |
6bbf1acd | 1431 | if (length != cmd.data_len) |
b77954cb MW |
1432 | status = -ENOMEM; |
1433 | else | |
94f370ca KB |
1434 | status = nvme_submit_sync_cmd(dev->queues[0], &c, &cmd.result, |
1435 | timeout); | |
eca18b23 | 1436 | |
6bbf1acd | 1437 | if (cmd.data_len) { |
1c2ad9fa | 1438 | nvme_unmap_user_pages(dev, cmd.opcode & 1, iod); |
eca18b23 | 1439 | nvme_free_iod(dev, iod); |
6bbf1acd | 1440 | } |
f4f117f6 | 1441 | |
cf90bc48 | 1442 | if ((status >= 0) && copy_to_user(&ucmd->result, &cmd.result, |
f4f117f6 KB |
1443 | sizeof(cmd.result))) |
1444 | status = -EFAULT; | |
1445 | ||
6ee44cdc MW |
1446 | return status; |
1447 | } | |
1448 | ||
b60503ba MW |
1449 | static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, |
1450 | unsigned long arg) | |
1451 | { | |
1452 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
1453 | ||
1454 | switch (cmd) { | |
6bbf1acd MW |
1455 | case NVME_IOCTL_ID: |
1456 | return ns->ns_id; | |
1457 | case NVME_IOCTL_ADMIN_CMD: | |
50af8bae | 1458 | return nvme_user_admin_cmd(ns->dev, (void __user *)arg); |
a53295b6 MW |
1459 | case NVME_IOCTL_SUBMIT_IO: |
1460 | return nvme_submit_io(ns, (void __user *)arg); | |
5d0f6131 VV |
1461 | case SG_GET_VERSION_NUM: |
1462 | return nvme_sg_get_version_num((void __user *)arg); | |
1463 | case SG_IO: | |
1464 | return nvme_sg_io(ns, (void __user *)arg); | |
b60503ba MW |
1465 | default: |
1466 | return -ENOTTY; | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | static const struct block_device_operations nvme_fops = { | |
1471 | .owner = THIS_MODULE, | |
1472 | .ioctl = nvme_ioctl, | |
49481682 | 1473 | .compat_ioctl = nvme_ioctl, |
b60503ba MW |
1474 | }; |
1475 | ||
1fa6aead MW |
1476 | static void nvme_resubmit_bios(struct nvme_queue *nvmeq) |
1477 | { | |
1478 | while (bio_list_peek(&nvmeq->sq_cong)) { | |
1479 | struct bio *bio = bio_list_pop(&nvmeq->sq_cong); | |
1480 | struct nvme_ns *ns = bio->bi_bdev->bd_disk->private_data; | |
427e9708 KB |
1481 | |
1482 | if (bio_list_empty(&nvmeq->sq_cong)) | |
1483 | remove_wait_queue(&nvmeq->sq_full, | |
1484 | &nvmeq->sq_cong_wait); | |
1fa6aead | 1485 | if (nvme_submit_bio_queue(nvmeq, ns, bio)) { |
427e9708 KB |
1486 | if (bio_list_empty(&nvmeq->sq_cong)) |
1487 | add_wait_queue(&nvmeq->sq_full, | |
1488 | &nvmeq->sq_cong_wait); | |
1fa6aead MW |
1489 | bio_list_add_head(&nvmeq->sq_cong, bio); |
1490 | break; | |
1491 | } | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | static int nvme_kthread(void *data) | |
1496 | { | |
1497 | struct nvme_dev *dev; | |
1498 | ||
1499 | while (!kthread_should_stop()) { | |
564a232c | 1500 | set_current_state(TASK_INTERRUPTIBLE); |
1fa6aead MW |
1501 | spin_lock(&dev_list_lock); |
1502 | list_for_each_entry(dev, &dev_list, node) { | |
1503 | int i; | |
1504 | for (i = 0; i < dev->queue_count; i++) { | |
1505 | struct nvme_queue *nvmeq = dev->queues[i]; | |
740216fc MW |
1506 | if (!nvmeq) |
1507 | continue; | |
1fa6aead MW |
1508 | spin_lock_irq(&nvmeq->q_lock); |
1509 | if (nvme_process_cq(nvmeq)) | |
1510 | printk("process_cq did something\n"); | |
a09115b2 | 1511 | nvme_cancel_ios(nvmeq, true); |
1fa6aead MW |
1512 | nvme_resubmit_bios(nvmeq); |
1513 | spin_unlock_irq(&nvmeq->q_lock); | |
1514 | } | |
1515 | } | |
1516 | spin_unlock(&dev_list_lock); | |
acb7aa0d | 1517 | schedule_timeout(round_jiffies_relative(HZ)); |
1fa6aead MW |
1518 | } |
1519 | return 0; | |
1520 | } | |
1521 | ||
5aff9382 MW |
1522 | static DEFINE_IDA(nvme_index_ida); |
1523 | ||
1524 | static int nvme_get_ns_idx(void) | |
1525 | { | |
1526 | int index, error; | |
1527 | ||
1528 | do { | |
1529 | if (!ida_pre_get(&nvme_index_ida, GFP_KERNEL)) | |
1530 | return -1; | |
1531 | ||
1532 | spin_lock(&dev_list_lock); | |
1533 | error = ida_get_new(&nvme_index_ida, &index); | |
1534 | spin_unlock(&dev_list_lock); | |
1535 | } while (error == -EAGAIN); | |
1536 | ||
1537 | if (error) | |
1538 | index = -1; | |
1539 | return index; | |
1540 | } | |
1541 | ||
1542 | static void nvme_put_ns_idx(int index) | |
1543 | { | |
1544 | spin_lock(&dev_list_lock); | |
1545 | ida_remove(&nvme_index_ida, index); | |
1546 | spin_unlock(&dev_list_lock); | |
1547 | } | |
1548 | ||
0e5e4f0e KB |
1549 | static void nvme_config_discard(struct nvme_ns *ns) |
1550 | { | |
1551 | u32 logical_block_size = queue_logical_block_size(ns->queue); | |
1552 | ns->queue->limits.discard_zeroes_data = 0; | |
1553 | ns->queue->limits.discard_alignment = logical_block_size; | |
1554 | ns->queue->limits.discard_granularity = logical_block_size; | |
1555 | ns->queue->limits.max_discard_sectors = 0xffffffff; | |
1556 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); | |
1557 | } | |
1558 | ||
5aff9382 | 1559 | static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int nsid, |
b60503ba MW |
1560 | struct nvme_id_ns *id, struct nvme_lba_range_type *rt) |
1561 | { | |
1562 | struct nvme_ns *ns; | |
1563 | struct gendisk *disk; | |
1564 | int lbaf; | |
1565 | ||
1566 | if (rt->attributes & NVME_LBART_ATTRIB_HIDE) | |
1567 | return NULL; | |
1568 | ||
1569 | ns = kzalloc(sizeof(*ns), GFP_KERNEL); | |
1570 | if (!ns) | |
1571 | return NULL; | |
1572 | ns->queue = blk_alloc_queue(GFP_KERNEL); | |
1573 | if (!ns->queue) | |
1574 | goto out_free_ns; | |
4eeb9215 MW |
1575 | ns->queue->queue_flags = QUEUE_FLAG_DEFAULT; |
1576 | queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); | |
1577 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); | |
b60503ba MW |
1578 | blk_queue_make_request(ns->queue, nvme_make_request); |
1579 | ns->dev = dev; | |
1580 | ns->queue->queuedata = ns; | |
1581 | ||
1582 | disk = alloc_disk(NVME_MINORS); | |
1583 | if (!disk) | |
1584 | goto out_free_queue; | |
5aff9382 | 1585 | ns->ns_id = nsid; |
b60503ba MW |
1586 | ns->disk = disk; |
1587 | lbaf = id->flbas & 0xf; | |
1588 | ns->lba_shift = id->lbaf[lbaf].ds; | |
f410c680 | 1589 | ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); |
e9ef4636 | 1590 | blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); |
8fc23e03 KB |
1591 | if (dev->max_hw_sectors) |
1592 | blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors); | |
b60503ba MW |
1593 | |
1594 | disk->major = nvme_major; | |
1595 | disk->minors = NVME_MINORS; | |
5aff9382 | 1596 | disk->first_minor = NVME_MINORS * nvme_get_ns_idx(); |
b60503ba MW |
1597 | disk->fops = &nvme_fops; |
1598 | disk->private_data = ns; | |
1599 | disk->queue = ns->queue; | |
388f037f | 1600 | disk->driverfs_dev = &dev->pci_dev->dev; |
5aff9382 | 1601 | sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid); |
b60503ba MW |
1602 | set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); |
1603 | ||
0e5e4f0e KB |
1604 | if (dev->oncs & NVME_CTRL_ONCS_DSM) |
1605 | nvme_config_discard(ns); | |
1606 | ||
b60503ba MW |
1607 | return ns; |
1608 | ||
1609 | out_free_queue: | |
1610 | blk_cleanup_queue(ns->queue); | |
1611 | out_free_ns: | |
1612 | kfree(ns); | |
1613 | return NULL; | |
1614 | } | |
1615 | ||
1616 | static void nvme_ns_free(struct nvme_ns *ns) | |
1617 | { | |
5aff9382 | 1618 | int index = ns->disk->first_minor / NVME_MINORS; |
b60503ba | 1619 | put_disk(ns->disk); |
5aff9382 | 1620 | nvme_put_ns_idx(index); |
b60503ba MW |
1621 | blk_cleanup_queue(ns->queue); |
1622 | kfree(ns); | |
1623 | } | |
1624 | ||
b3b06812 | 1625 | static int set_queue_count(struct nvme_dev *dev, int count) |
b60503ba MW |
1626 | { |
1627 | int status; | |
1628 | u32 result; | |
b3b06812 | 1629 | u32 q_count = (count - 1) | ((count - 1) << 16); |
b60503ba | 1630 | |
df348139 | 1631 | status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0, |
bc5fc7e4 | 1632 | &result); |
b60503ba MW |
1633 | if (status) |
1634 | return -EIO; | |
1635 | return min(result & 0xffff, result >> 16) + 1; | |
1636 | } | |
1637 | ||
8d85fce7 | 1638 | static int nvme_setup_io_queues(struct nvme_dev *dev) |
b60503ba | 1639 | { |
fa08a396 RRG |
1640 | struct pci_dev *pdev = dev->pci_dev; |
1641 | int result, cpu, i, nr_io_queues, db_bar_size, q_depth, q_count; | |
b60503ba | 1642 | |
b348b7d5 MW |
1643 | nr_io_queues = num_online_cpus(); |
1644 | result = set_queue_count(dev, nr_io_queues); | |
1b23484b MW |
1645 | if (result < 0) |
1646 | return result; | |
b348b7d5 MW |
1647 | if (result < nr_io_queues) |
1648 | nr_io_queues = result; | |
b60503ba | 1649 | |
fa08a396 | 1650 | q_count = nr_io_queues; |
1b23484b MW |
1651 | /* Deregister the admin queue's interrupt */ |
1652 | free_irq(dev->entry[0].vector, dev->queues[0]); | |
1653 | ||
f1938f6e MW |
1654 | db_bar_size = 4096 + ((nr_io_queues + 1) << (dev->db_stride + 3)); |
1655 | if (db_bar_size > 8192) { | |
1656 | iounmap(dev->bar); | |
fa08a396 | 1657 | dev->bar = ioremap(pci_resource_start(pdev, 0), db_bar_size); |
f1938f6e MW |
1658 | dev->dbs = ((void __iomem *)dev->bar) + 4096; |
1659 | dev->queues[0]->q_db = dev->dbs; | |
1660 | } | |
1661 | ||
b348b7d5 | 1662 | for (i = 0; i < nr_io_queues; i++) |
1b23484b MW |
1663 | dev->entry[i].entry = i; |
1664 | for (;;) { | |
fa08a396 | 1665 | result = pci_enable_msix(pdev, dev->entry, nr_io_queues); |
1b23484b MW |
1666 | if (result == 0) { |
1667 | break; | |
1668 | } else if (result > 0) { | |
b348b7d5 | 1669 | nr_io_queues = result; |
1b23484b MW |
1670 | continue; |
1671 | } else { | |
fa08a396 | 1672 | nr_io_queues = 0; |
1b23484b MW |
1673 | break; |
1674 | } | |
1675 | } | |
1676 | ||
fa08a396 RRG |
1677 | if (nr_io_queues == 0) { |
1678 | nr_io_queues = q_count; | |
1679 | for (;;) { | |
1680 | result = pci_enable_msi_block(pdev, nr_io_queues); | |
1681 | if (result == 0) { | |
1682 | for (i = 0; i < nr_io_queues; i++) | |
1683 | dev->entry[i].vector = i + pdev->irq; | |
1684 | break; | |
1685 | } else if (result > 0) { | |
1686 | nr_io_queues = result; | |
1687 | continue; | |
1688 | } else { | |
1689 | nr_io_queues = 1; | |
1690 | break; | |
1691 | } | |
1692 | } | |
1693 | } | |
1694 | ||
1b23484b MW |
1695 | result = queue_request_irq(dev, dev->queues[0], "nvme admin"); |
1696 | /* XXX: handle failure here */ | |
1697 | ||
1698 | cpu = cpumask_first(cpu_online_mask); | |
b348b7d5 | 1699 | for (i = 0; i < nr_io_queues; i++) { |
1b23484b MW |
1700 | irq_set_affinity_hint(dev->entry[i].vector, get_cpu_mask(cpu)); |
1701 | cpu = cpumask_next(cpu, cpu_online_mask); | |
1702 | } | |
1703 | ||
a0cadb85 KB |
1704 | q_depth = min_t(int, NVME_CAP_MQES(readq(&dev->bar->cap)) + 1, |
1705 | NVME_Q_DEPTH); | |
b348b7d5 | 1706 | for (i = 0; i < nr_io_queues; i++) { |
a0cadb85 | 1707 | dev->queues[i + 1] = nvme_create_queue(dev, i + 1, q_depth, i); |
6f0f5449 MW |
1708 | if (IS_ERR(dev->queues[i + 1])) |
1709 | return PTR_ERR(dev->queues[i + 1]); | |
1b23484b MW |
1710 | dev->queue_count++; |
1711 | } | |
b60503ba | 1712 | |
9ecdc946 MW |
1713 | for (; i < num_possible_cpus(); i++) { |
1714 | int target = i % rounddown_pow_of_two(dev->queue_count - 1); | |
1715 | dev->queues[i + 1] = dev->queues[target + 1]; | |
1716 | } | |
1717 | ||
b60503ba MW |
1718 | return 0; |
1719 | } | |
1720 | ||
1721 | static void nvme_free_queues(struct nvme_dev *dev) | |
1722 | { | |
1723 | int i; | |
1724 | ||
1725 | for (i = dev->queue_count - 1; i >= 0; i--) | |
1726 | nvme_free_queue(dev, i); | |
1727 | } | |
1728 | ||
422ef0c7 MW |
1729 | /* |
1730 | * Return: error value if an error occurred setting up the queues or calling | |
1731 | * Identify Device. 0 if these succeeded, even if adding some of the | |
1732 | * namespaces failed. At the moment, these failures are silent. TBD which | |
1733 | * failures should be reported. | |
1734 | */ | |
8d85fce7 | 1735 | static int nvme_dev_add(struct nvme_dev *dev) |
b60503ba MW |
1736 | { |
1737 | int res, nn, i; | |
cbb6218f | 1738 | struct nvme_ns *ns; |
51814232 | 1739 | struct nvme_id_ctrl *ctrl; |
bc5fc7e4 MW |
1740 | struct nvme_id_ns *id_ns; |
1741 | void *mem; | |
b60503ba | 1742 | dma_addr_t dma_addr; |
159b67d7 | 1743 | int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; |
b60503ba MW |
1744 | |
1745 | res = nvme_setup_io_queues(dev); | |
1746 | if (res) | |
1747 | return res; | |
1748 | ||
bc5fc7e4 | 1749 | mem = dma_alloc_coherent(&dev->pci_dev->dev, 8192, &dma_addr, |
b60503ba | 1750 | GFP_KERNEL); |
a9ef4343 KB |
1751 | if (!mem) |
1752 | return -ENOMEM; | |
b60503ba | 1753 | |
bc5fc7e4 | 1754 | res = nvme_identify(dev, 0, 1, dma_addr); |
b60503ba MW |
1755 | if (res) { |
1756 | res = -EIO; | |
cbb6218f | 1757 | goto out; |
b60503ba MW |
1758 | } |
1759 | ||
bc5fc7e4 | 1760 | ctrl = mem; |
51814232 | 1761 | nn = le32_to_cpup(&ctrl->nn); |
0e5e4f0e | 1762 | dev->oncs = le16_to_cpup(&ctrl->oncs); |
51814232 MW |
1763 | memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn)); |
1764 | memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn)); | |
1765 | memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr)); | |
159b67d7 | 1766 | if (ctrl->mdts) |
8fc23e03 | 1767 | dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9); |
159b67d7 KB |
1768 | if ((dev->pci_dev->vendor == PCI_VENDOR_ID_INTEL) && |
1769 | (dev->pci_dev->device == 0x0953) && ctrl->vs[3]) | |
1770 | dev->stripe_size = 1 << (ctrl->vs[3] + shift); | |
b60503ba | 1771 | |
bc5fc7e4 | 1772 | id_ns = mem; |
2b2c1896 | 1773 | for (i = 1; i <= nn; i++) { |
bc5fc7e4 | 1774 | res = nvme_identify(dev, i, 0, dma_addr); |
b60503ba MW |
1775 | if (res) |
1776 | continue; | |
1777 | ||
bc5fc7e4 | 1778 | if (id_ns->ncap == 0) |
b60503ba MW |
1779 | continue; |
1780 | ||
bc5fc7e4 | 1781 | res = nvme_get_features(dev, NVME_FEAT_LBA_RANGE, i, |
08df1e05 | 1782 | dma_addr + 4096, NULL); |
b60503ba | 1783 | if (res) |
12209036 | 1784 | memset(mem + 4096, 0, 4096); |
b60503ba | 1785 | |
bc5fc7e4 | 1786 | ns = nvme_alloc_ns(dev, i, mem, mem + 4096); |
b60503ba MW |
1787 | if (ns) |
1788 | list_add_tail(&ns->list, &dev->namespaces); | |
1789 | } | |
1790 | list_for_each_entry(ns, &dev->namespaces, list) | |
1791 | add_disk(ns->disk); | |
422ef0c7 | 1792 | res = 0; |
b60503ba | 1793 | |
bc5fc7e4 | 1794 | out: |
684f5c20 | 1795 | dma_free_coherent(&dev->pci_dev->dev, 8192, mem, dma_addr); |
b60503ba MW |
1796 | return res; |
1797 | } | |
1798 | ||
1799 | static int nvme_dev_remove(struct nvme_dev *dev) | |
1800 | { | |
1801 | struct nvme_ns *ns, *next; | |
1802 | ||
1fa6aead MW |
1803 | spin_lock(&dev_list_lock); |
1804 | list_del(&dev->node); | |
1805 | spin_unlock(&dev_list_lock); | |
1806 | ||
b60503ba MW |
1807 | list_for_each_entry_safe(ns, next, &dev->namespaces, list) { |
1808 | list_del(&ns->list); | |
1809 | del_gendisk(ns->disk); | |
1810 | nvme_ns_free(ns); | |
1811 | } | |
1812 | ||
1813 | nvme_free_queues(dev); | |
1814 | ||
1815 | return 0; | |
1816 | } | |
1817 | ||
091b6092 MW |
1818 | static int nvme_setup_prp_pools(struct nvme_dev *dev) |
1819 | { | |
1820 | struct device *dmadev = &dev->pci_dev->dev; | |
1821 | dev->prp_page_pool = dma_pool_create("prp list page", dmadev, | |
1822 | PAGE_SIZE, PAGE_SIZE, 0); | |
1823 | if (!dev->prp_page_pool) | |
1824 | return -ENOMEM; | |
1825 | ||
99802a7a MW |
1826 | /* Optimisation for I/Os between 4k and 128k */ |
1827 | dev->prp_small_pool = dma_pool_create("prp list 256", dmadev, | |
1828 | 256, 256, 0); | |
1829 | if (!dev->prp_small_pool) { | |
1830 | dma_pool_destroy(dev->prp_page_pool); | |
1831 | return -ENOMEM; | |
1832 | } | |
091b6092 MW |
1833 | return 0; |
1834 | } | |
1835 | ||
1836 | static void nvme_release_prp_pools(struct nvme_dev *dev) | |
1837 | { | |
1838 | dma_pool_destroy(dev->prp_page_pool); | |
99802a7a | 1839 | dma_pool_destroy(dev->prp_small_pool); |
091b6092 MW |
1840 | } |
1841 | ||
cd58ad7d QSA |
1842 | static DEFINE_IDA(nvme_instance_ida); |
1843 | ||
1844 | static int nvme_set_instance(struct nvme_dev *dev) | |
b60503ba | 1845 | { |
cd58ad7d QSA |
1846 | int instance, error; |
1847 | ||
1848 | do { | |
1849 | if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) | |
1850 | return -ENODEV; | |
1851 | ||
1852 | spin_lock(&dev_list_lock); | |
1853 | error = ida_get_new(&nvme_instance_ida, &instance); | |
1854 | spin_unlock(&dev_list_lock); | |
1855 | } while (error == -EAGAIN); | |
1856 | ||
1857 | if (error) | |
1858 | return -ENODEV; | |
1859 | ||
1860 | dev->instance = instance; | |
1861 | return 0; | |
b60503ba MW |
1862 | } |
1863 | ||
1864 | static void nvme_release_instance(struct nvme_dev *dev) | |
1865 | { | |
cd58ad7d QSA |
1866 | spin_lock(&dev_list_lock); |
1867 | ida_remove(&nvme_instance_ida, dev->instance); | |
1868 | spin_unlock(&dev_list_lock); | |
b60503ba MW |
1869 | } |
1870 | ||
5e82e952 KB |
1871 | static void nvme_free_dev(struct kref *kref) |
1872 | { | |
1873 | struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref); | |
1874 | nvme_dev_remove(dev); | |
fa08a396 RRG |
1875 | if (dev->pci_dev->msi_enabled) |
1876 | pci_disable_msi(dev->pci_dev); | |
1877 | else if (dev->pci_dev->msix_enabled) | |
1878 | pci_disable_msix(dev->pci_dev); | |
5e82e952 KB |
1879 | iounmap(dev->bar); |
1880 | nvme_release_instance(dev); | |
1881 | nvme_release_prp_pools(dev); | |
1882 | pci_disable_device(dev->pci_dev); | |
1883 | pci_release_regions(dev->pci_dev); | |
1884 | kfree(dev->queues); | |
1885 | kfree(dev->entry); | |
1886 | kfree(dev); | |
1887 | } | |
1888 | ||
1889 | static int nvme_dev_open(struct inode *inode, struct file *f) | |
1890 | { | |
1891 | struct nvme_dev *dev = container_of(f->private_data, struct nvme_dev, | |
1892 | miscdev); | |
1893 | kref_get(&dev->kref); | |
1894 | f->private_data = dev; | |
1895 | return 0; | |
1896 | } | |
1897 | ||
1898 | static int nvme_dev_release(struct inode *inode, struct file *f) | |
1899 | { | |
1900 | struct nvme_dev *dev = f->private_data; | |
1901 | kref_put(&dev->kref, nvme_free_dev); | |
1902 | return 0; | |
1903 | } | |
1904 | ||
1905 | static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg) | |
1906 | { | |
1907 | struct nvme_dev *dev = f->private_data; | |
1908 | switch (cmd) { | |
1909 | case NVME_IOCTL_ADMIN_CMD: | |
1910 | return nvme_user_admin_cmd(dev, (void __user *)arg); | |
1911 | default: | |
1912 | return -ENOTTY; | |
1913 | } | |
1914 | } | |
1915 | ||
1916 | static const struct file_operations nvme_dev_fops = { | |
1917 | .owner = THIS_MODULE, | |
1918 | .open = nvme_dev_open, | |
1919 | .release = nvme_dev_release, | |
1920 | .unlocked_ioctl = nvme_dev_ioctl, | |
1921 | .compat_ioctl = nvme_dev_ioctl, | |
1922 | }; | |
1923 | ||
8d85fce7 | 1924 | static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
b60503ba | 1925 | { |
574e8b95 | 1926 | int bars, result = -ENOMEM; |
b60503ba MW |
1927 | struct nvme_dev *dev; |
1928 | ||
1929 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1930 | if (!dev) | |
1931 | return -ENOMEM; | |
1932 | dev->entry = kcalloc(num_possible_cpus(), sizeof(*dev->entry), | |
1933 | GFP_KERNEL); | |
1934 | if (!dev->entry) | |
1935 | goto free; | |
1b23484b MW |
1936 | dev->queues = kcalloc(num_possible_cpus() + 1, sizeof(void *), |
1937 | GFP_KERNEL); | |
b60503ba MW |
1938 | if (!dev->queues) |
1939 | goto free; | |
1940 | ||
0ee5a7d7 SMM |
1941 | if (pci_enable_device_mem(pdev)) |
1942 | goto free; | |
f64d3365 | 1943 | pci_set_master(pdev); |
574e8b95 MW |
1944 | bars = pci_select_bars(pdev, IORESOURCE_MEM); |
1945 | if (pci_request_selected_regions(pdev, bars, "nvme")) | |
1946 | goto disable; | |
0ee5a7d7 | 1947 | |
b60503ba MW |
1948 | INIT_LIST_HEAD(&dev->namespaces); |
1949 | dev->pci_dev = pdev; | |
1950 | pci_set_drvdata(pdev, dev); | |
cf9f123b MW |
1951 | |
1952 | if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) | |
1953 | dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); | |
1954 | else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) | |
1955 | dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); | |
1956 | else | |
1957 | goto disable; | |
1958 | ||
cd58ad7d QSA |
1959 | result = nvme_set_instance(dev); |
1960 | if (result) | |
1961 | goto disable; | |
1962 | ||
53c9577e | 1963 | dev->entry[0].vector = pdev->irq; |
b60503ba | 1964 | |
091b6092 MW |
1965 | result = nvme_setup_prp_pools(dev); |
1966 | if (result) | |
1967 | goto disable_msix; | |
1968 | ||
b60503ba MW |
1969 | dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); |
1970 | if (!dev->bar) { | |
1971 | result = -ENOMEM; | |
574e8b95 | 1972 | goto disable_msix; |
b60503ba MW |
1973 | } |
1974 | ||
1975 | result = nvme_configure_admin_queue(dev); | |
1976 | if (result) | |
1977 | goto unmap; | |
1978 | dev->queue_count++; | |
1979 | ||
1fa6aead MW |
1980 | spin_lock(&dev_list_lock); |
1981 | list_add(&dev->node, &dev_list); | |
1982 | spin_unlock(&dev_list_lock); | |
1983 | ||
740216fc MW |
1984 | result = nvme_dev_add(dev); |
1985 | if (result) | |
1986 | goto delete; | |
1987 | ||
5e82e952 KB |
1988 | scnprintf(dev->name, sizeof(dev->name), "nvme%d", dev->instance); |
1989 | dev->miscdev.minor = MISC_DYNAMIC_MINOR; | |
1990 | dev->miscdev.parent = &pdev->dev; | |
1991 | dev->miscdev.name = dev->name; | |
1992 | dev->miscdev.fops = &nvme_dev_fops; | |
1993 | result = misc_register(&dev->miscdev); | |
1994 | if (result) | |
1995 | goto remove; | |
1996 | ||
1997 | kref_init(&dev->kref); | |
b60503ba MW |
1998 | return 0; |
1999 | ||
5e82e952 KB |
2000 | remove: |
2001 | nvme_dev_remove(dev); | |
b60503ba | 2002 | delete: |
740216fc MW |
2003 | spin_lock(&dev_list_lock); |
2004 | list_del(&dev->node); | |
2005 | spin_unlock(&dev_list_lock); | |
2006 | ||
b60503ba MW |
2007 | nvme_free_queues(dev); |
2008 | unmap: | |
2009 | iounmap(dev->bar); | |
574e8b95 | 2010 | disable_msix: |
fa08a396 RRG |
2011 | if (dev->pci_dev->msi_enabled) |
2012 | pci_disable_msi(dev->pci_dev); | |
2013 | else if (dev->pci_dev->msix_enabled) | |
2014 | pci_disable_msix(dev->pci_dev); | |
b60503ba | 2015 | nvme_release_instance(dev); |
091b6092 | 2016 | nvme_release_prp_pools(dev); |
574e8b95 | 2017 | disable: |
0ee5a7d7 | 2018 | pci_disable_device(pdev); |
574e8b95 | 2019 | pci_release_regions(pdev); |
b60503ba MW |
2020 | free: |
2021 | kfree(dev->queues); | |
2022 | kfree(dev->entry); | |
2023 | kfree(dev); | |
2024 | return result; | |
2025 | } | |
2026 | ||
8d85fce7 | 2027 | static void nvme_remove(struct pci_dev *pdev) |
b60503ba MW |
2028 | { |
2029 | struct nvme_dev *dev = pci_get_drvdata(pdev); | |
5e82e952 KB |
2030 | misc_deregister(&dev->miscdev); |
2031 | kref_put(&dev->kref, nvme_free_dev); | |
b60503ba MW |
2032 | } |
2033 | ||
2034 | /* These functions are yet to be implemented */ | |
2035 | #define nvme_error_detected NULL | |
2036 | #define nvme_dump_registers NULL | |
2037 | #define nvme_link_reset NULL | |
2038 | #define nvme_slot_reset NULL | |
2039 | #define nvme_error_resume NULL | |
2040 | #define nvme_suspend NULL | |
2041 | #define nvme_resume NULL | |
2042 | ||
1d352035 | 2043 | static const struct pci_error_handlers nvme_err_handler = { |
b60503ba MW |
2044 | .error_detected = nvme_error_detected, |
2045 | .mmio_enabled = nvme_dump_registers, | |
2046 | .link_reset = nvme_link_reset, | |
2047 | .slot_reset = nvme_slot_reset, | |
2048 | .resume = nvme_error_resume, | |
2049 | }; | |
2050 | ||
2051 | /* Move to pci_ids.h later */ | |
2052 | #define PCI_CLASS_STORAGE_EXPRESS 0x010802 | |
2053 | ||
2054 | static DEFINE_PCI_DEVICE_TABLE(nvme_id_table) = { | |
2055 | { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, | |
2056 | { 0, } | |
2057 | }; | |
2058 | MODULE_DEVICE_TABLE(pci, nvme_id_table); | |
2059 | ||
2060 | static struct pci_driver nvme_driver = { | |
2061 | .name = "nvme", | |
2062 | .id_table = nvme_id_table, | |
2063 | .probe = nvme_probe, | |
8d85fce7 | 2064 | .remove = nvme_remove, |
b60503ba MW |
2065 | .suspend = nvme_suspend, |
2066 | .resume = nvme_resume, | |
2067 | .err_handler = &nvme_err_handler, | |
2068 | }; | |
2069 | ||
2070 | static int __init nvme_init(void) | |
2071 | { | |
0ac13140 | 2072 | int result; |
1fa6aead MW |
2073 | |
2074 | nvme_thread = kthread_run(nvme_kthread, NULL, "nvme"); | |
2075 | if (IS_ERR(nvme_thread)) | |
2076 | return PTR_ERR(nvme_thread); | |
b60503ba | 2077 | |
5c42ea16 KB |
2078 | result = register_blkdev(nvme_major, "nvme"); |
2079 | if (result < 0) | |
1fa6aead | 2080 | goto kill_kthread; |
5c42ea16 | 2081 | else if (result > 0) |
0ac13140 | 2082 | nvme_major = result; |
b60503ba MW |
2083 | |
2084 | result = pci_register_driver(&nvme_driver); | |
1fa6aead MW |
2085 | if (result) |
2086 | goto unregister_blkdev; | |
2087 | return 0; | |
b60503ba | 2088 | |
1fa6aead | 2089 | unregister_blkdev: |
b60503ba | 2090 | unregister_blkdev(nvme_major, "nvme"); |
1fa6aead MW |
2091 | kill_kthread: |
2092 | kthread_stop(nvme_thread); | |
b60503ba MW |
2093 | return result; |
2094 | } | |
2095 | ||
2096 | static void __exit nvme_exit(void) | |
2097 | { | |
2098 | pci_unregister_driver(&nvme_driver); | |
2099 | unregister_blkdev(nvme_major, "nvme"); | |
1fa6aead | 2100 | kthread_stop(nvme_thread); |
b60503ba MW |
2101 | } |
2102 | ||
2103 | MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); | |
2104 | MODULE_LICENSE("GPL"); | |
366e8217 | 2105 | MODULE_VERSION("0.8"); |
b60503ba MW |
2106 | module_init(nvme_init); |
2107 | module_exit(nvme_exit); |