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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> | |
21 | #include <linux/blkdev.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/fs.h> | |
24 | #include <linux/genhd.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/kdev_t.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/moduleparam.h> | |
33 | #include <linux/pci.h> | |
be7b6275 | 34 | #include <linux/poison.h> |
b60503ba MW |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/types.h> | |
38 | #include <linux/version.h> | |
39 | ||
40 | #define NVME_Q_DEPTH 1024 | |
41 | #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) | |
42 | #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) | |
43 | #define NVME_MINORS 64 | |
e85248e5 MW |
44 | #define IO_TIMEOUT (5 * HZ) |
45 | #define ADMIN_TIMEOUT (60 * HZ) | |
b60503ba MW |
46 | |
47 | static int nvme_major; | |
48 | module_param(nvme_major, int, 0); | |
49 | ||
58ffacb5 MW |
50 | static int use_threaded_interrupts; |
51 | module_param(use_threaded_interrupts, int, 0); | |
52 | ||
b60503ba MW |
53 | /* |
54 | * Represents an NVM Express device. Each nvme_dev is a PCI function. | |
55 | */ | |
56 | struct nvme_dev { | |
b60503ba MW |
57 | struct nvme_queue **queues; |
58 | u32 __iomem *dbs; | |
59 | struct pci_dev *pci_dev; | |
091b6092 | 60 | struct dma_pool *prp_page_pool; |
99802a7a | 61 | struct dma_pool *prp_small_pool; |
b60503ba MW |
62 | int instance; |
63 | int queue_count; | |
64 | u32 ctrl_config; | |
65 | struct msix_entry *entry; | |
66 | struct nvme_bar __iomem *bar; | |
67 | struct list_head namespaces; | |
51814232 MW |
68 | char serial[20]; |
69 | char model[40]; | |
70 | char firmware_rev[8]; | |
b60503ba MW |
71 | }; |
72 | ||
73 | /* | |
74 | * An NVM Express namespace is equivalent to a SCSI LUN | |
75 | */ | |
76 | struct nvme_ns { | |
77 | struct list_head list; | |
78 | ||
79 | struct nvme_dev *dev; | |
80 | struct request_queue *queue; | |
81 | struct gendisk *disk; | |
82 | ||
83 | int ns_id; | |
84 | int lba_shift; | |
85 | }; | |
86 | ||
87 | /* | |
88 | * An NVM Express queue. Each device has at least two (one for admin | |
89 | * commands and one for I/O commands). | |
90 | */ | |
91 | struct nvme_queue { | |
92 | struct device *q_dmadev; | |
091b6092 | 93 | struct nvme_dev *dev; |
b60503ba MW |
94 | spinlock_t q_lock; |
95 | struct nvme_command *sq_cmds; | |
96 | volatile struct nvme_completion *cqes; | |
97 | dma_addr_t sq_dma_addr; | |
98 | dma_addr_t cq_dma_addr; | |
99 | wait_queue_head_t sq_full; | |
100 | struct bio_list sq_cong; | |
101 | u32 __iomem *q_db; | |
102 | u16 q_depth; | |
103 | u16 cq_vector; | |
104 | u16 sq_head; | |
105 | u16 sq_tail; | |
106 | u16 cq_head; | |
82123460 | 107 | u16 cq_phase; |
b60503ba MW |
108 | unsigned long cmdid_data[]; |
109 | }; | |
110 | ||
9294bbed MW |
111 | static void nvme_resubmit_bio(struct nvme_queue *nvmeq, struct bio *bio); |
112 | ||
b60503ba MW |
113 | /* |
114 | * Check we didin't inadvertently grow the command struct | |
115 | */ | |
116 | static inline void _nvme_check_size(void) | |
117 | { | |
118 | BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); | |
119 | BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); | |
120 | BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); | |
121 | BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); | |
122 | BUILD_BUG_ON(sizeof(struct nvme_features) != 64); | |
123 | BUILD_BUG_ON(sizeof(struct nvme_command) != 64); | |
124 | BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); | |
125 | BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); | |
126 | BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); | |
127 | } | |
128 | ||
e85248e5 MW |
129 | struct nvme_cmd_info { |
130 | unsigned long ctx; | |
131 | unsigned long timeout; | |
132 | }; | |
133 | ||
134 | static struct nvme_cmd_info *nvme_cmd_info(struct nvme_queue *nvmeq) | |
135 | { | |
136 | return (void *)&nvmeq->cmdid_data[BITS_TO_LONGS(nvmeq->q_depth)]; | |
137 | } | |
138 | ||
b60503ba MW |
139 | /** |
140 | * alloc_cmdid - Allocate a Command ID | |
141 | * @param nvmeq The queue that will be used for this command | |
142 | * @param ctx A pointer that will be passed to the handler | |
143 | * @param handler The ID of the handler to call | |
144 | * | |
145 | * Allocate a Command ID for a queue. The data passed in will | |
146 | * be passed to the completion handler. This is implemented by using | |
147 | * the bottom two bits of the ctx pointer to store the handler ID. | |
148 | * Passing in a pointer that's not 4-byte aligned will cause a BUG. | |
149 | * We can change this if it becomes a problem. | |
150 | */ | |
e85248e5 MW |
151 | static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx, int handler, |
152 | unsigned timeout) | |
b60503ba MW |
153 | { |
154 | int depth = nvmeq->q_depth; | |
e85248e5 | 155 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
b60503ba MW |
156 | int cmdid; |
157 | ||
158 | BUG_ON((unsigned long)ctx & 3); | |
159 | ||
160 | do { | |
161 | cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth); | |
162 | if (cmdid >= depth) | |
163 | return -EBUSY; | |
164 | } while (test_and_set_bit(cmdid, nvmeq->cmdid_data)); | |
165 | ||
e85248e5 MW |
166 | info[cmdid].ctx = (unsigned long)ctx | handler; |
167 | info[cmdid].timeout = jiffies + timeout; | |
b60503ba MW |
168 | return cmdid; |
169 | } | |
170 | ||
171 | static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx, | |
e85248e5 | 172 | int handler, unsigned timeout) |
b60503ba MW |
173 | { |
174 | int cmdid; | |
175 | wait_event_killable(nvmeq->sq_full, | |
e85248e5 | 176 | (cmdid = alloc_cmdid(nvmeq, ctx, handler, timeout)) >= 0); |
b60503ba MW |
177 | return (cmdid < 0) ? -EINTR : cmdid; |
178 | } | |
179 | ||
180 | /* If you need more than four handlers, you'll need to change how | |
be7b6275 MW |
181 | * alloc_cmdid and nvme_process_cq work. Consider using a special |
182 | * CMD_CTX value instead, if that works for your situation. | |
b60503ba MW |
183 | */ |
184 | enum { | |
185 | sync_completion_id = 0, | |
186 | bio_completion_id, | |
187 | }; | |
188 | ||
be7b6275 | 189 | #define CMD_CTX_BASE (POISON_POINTER_DELTA + sync_completion_id) |
d2d87034 MW |
190 | #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) |
191 | #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) | |
192 | #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) | |
be7b6275 | 193 | |
b60503ba MW |
194 | static unsigned long free_cmdid(struct nvme_queue *nvmeq, int cmdid) |
195 | { | |
196 | unsigned long data; | |
e85248e5 | 197 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
b60503ba | 198 | |
e85248e5 | 199 | if (cmdid >= nvmeq->q_depth) |
48e3d398 | 200 | return CMD_CTX_INVALID; |
e85248e5 MW |
201 | data = info[cmdid].ctx; |
202 | info[cmdid].ctx = CMD_CTX_COMPLETED; | |
b60503ba MW |
203 | clear_bit(cmdid, nvmeq->cmdid_data); |
204 | wake_up(&nvmeq->sq_full); | |
205 | return data; | |
206 | } | |
207 | ||
be7b6275 | 208 | static void cancel_cmdid_data(struct nvme_queue *nvmeq, int cmdid) |
3c0cf138 | 209 | { |
e85248e5 MW |
210 | struct nvme_cmd_info *info = nvme_cmd_info(nvmeq); |
211 | info[cmdid].ctx = CMD_CTX_CANCELLED; | |
3c0cf138 MW |
212 | } |
213 | ||
b60503ba MW |
214 | static struct nvme_queue *get_nvmeq(struct nvme_ns *ns) |
215 | { | |
1b23484b MW |
216 | int qid, cpu = get_cpu(); |
217 | if (cpu < ns->dev->queue_count) | |
218 | qid = cpu + 1; | |
219 | else | |
220 | qid = (cpu % rounddown_pow_of_two(ns->dev->queue_count)) + 1; | |
221 | return ns->dev->queues[qid]; | |
b60503ba MW |
222 | } |
223 | ||
224 | static void put_nvmeq(struct nvme_queue *nvmeq) | |
225 | { | |
1b23484b | 226 | put_cpu(); |
b60503ba MW |
227 | } |
228 | ||
229 | /** | |
230 | * nvme_submit_cmd: Copy a command into a queue and ring the doorbell | |
231 | * @nvmeq: The queue to use | |
232 | * @cmd: The command to send | |
233 | * | |
234 | * Safe to use from interrupt context | |
235 | */ | |
236 | static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) | |
237 | { | |
238 | unsigned long flags; | |
239 | u16 tail; | |
240 | /* XXX: Need to check tail isn't going to overrun head */ | |
241 | spin_lock_irqsave(&nvmeq->q_lock, flags); | |
242 | tail = nvmeq->sq_tail; | |
243 | memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); | |
244 | writel(tail, nvmeq->q_db); | |
245 | if (++tail == nvmeq->q_depth) | |
246 | tail = 0; | |
247 | nvmeq->sq_tail = tail; | |
248 | spin_unlock_irqrestore(&nvmeq->q_lock, flags); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
e025344c SMM |
253 | struct nvme_prps { |
254 | int npages; | |
255 | dma_addr_t first_dma; | |
256 | __le64 *list[0]; | |
257 | }; | |
258 | ||
259 | static void nvme_free_prps(struct nvme_queue *nvmeq, struct nvme_prps *prps) | |
260 | { | |
261 | const int last_prp = PAGE_SIZE / 8 - 1; | |
091b6092 | 262 | struct nvme_dev *dev = nvmeq->dev; |
e025344c SMM |
263 | int i; |
264 | dma_addr_t prp_dma; | |
265 | ||
266 | if (!prps) | |
267 | return; | |
268 | ||
269 | prp_dma = prps->first_dma; | |
99802a7a MW |
270 | |
271 | if (prps->npages == 0) | |
272 | dma_pool_free(dev->prp_small_pool, prps->list[0], prp_dma); | |
e025344c SMM |
273 | for (i = 0; i < prps->npages; i++) { |
274 | __le64 *prp_list = prps->list[i]; | |
275 | dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); | |
091b6092 | 276 | dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); |
e025344c SMM |
277 | prp_dma = next_prp_dma; |
278 | } | |
279 | kfree(prps); | |
280 | } | |
281 | ||
d534df3c | 282 | struct nvme_bio { |
b60503ba MW |
283 | struct bio *bio; |
284 | int nents; | |
e025344c | 285 | struct nvme_prps *prps; |
b60503ba MW |
286 | struct scatterlist sg[0]; |
287 | }; | |
288 | ||
289 | /* XXX: use a mempool */ | |
d534df3c | 290 | static struct nvme_bio *alloc_nbio(unsigned nseg, gfp_t gfp) |
b60503ba | 291 | { |
d534df3c | 292 | return kzalloc(sizeof(struct nvme_bio) + |
b60503ba MW |
293 | sizeof(struct scatterlist) * nseg, gfp); |
294 | } | |
295 | ||
d534df3c | 296 | static void free_nbio(struct nvme_queue *nvmeq, struct nvme_bio *nbio) |
b60503ba | 297 | { |
d534df3c MW |
298 | nvme_free_prps(nvmeq, nbio->prps); |
299 | kfree(nbio); | |
b60503ba MW |
300 | } |
301 | ||
302 | static void bio_completion(struct nvme_queue *nvmeq, void *ctx, | |
303 | struct nvme_completion *cqe) | |
304 | { | |
d534df3c MW |
305 | struct nvme_bio *nbio = ctx; |
306 | struct bio *bio = nbio->bio; | |
b60503ba MW |
307 | u16 status = le16_to_cpup(&cqe->status) >> 1; |
308 | ||
d534df3c | 309 | dma_unmap_sg(nvmeq->q_dmadev, nbio->sg, nbio->nents, |
b60503ba | 310 | bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
d534df3c | 311 | free_nbio(nvmeq, nbio); |
b60503ba | 312 | bio_endio(bio, status ? -EIO : 0); |
9294bbed MW |
313 | bio = bio_list_pop(&nvmeq->sq_cong); |
314 | if (bio) | |
315 | nvme_resubmit_bio(nvmeq, bio); | |
b60503ba MW |
316 | } |
317 | ||
ff22b54f | 318 | /* length is in bytes */ |
e025344c SMM |
319 | static struct nvme_prps *nvme_setup_prps(struct nvme_queue *nvmeq, |
320 | struct nvme_common_command *cmd, | |
ff22b54f MW |
321 | struct scatterlist *sg, int length) |
322 | { | |
091b6092 | 323 | struct nvme_dev *dev = nvmeq->dev; |
99802a7a | 324 | struct dma_pool *pool; |
ff22b54f MW |
325 | int dma_len = sg_dma_len(sg); |
326 | u64 dma_addr = sg_dma_address(sg); | |
327 | int offset = offset_in_page(dma_addr); | |
e025344c SMM |
328 | __le64 *prp_list; |
329 | dma_addr_t prp_dma; | |
330 | int nprps, npages, i, prp_page; | |
331 | struct nvme_prps *prps = NULL; | |
ff22b54f MW |
332 | |
333 | cmd->prp1 = cpu_to_le64(dma_addr); | |
334 | length -= (PAGE_SIZE - offset); | |
335 | if (length <= 0) | |
e025344c | 336 | return prps; |
ff22b54f MW |
337 | |
338 | dma_len -= (PAGE_SIZE - offset); | |
339 | if (dma_len) { | |
340 | dma_addr += (PAGE_SIZE - offset); | |
341 | } else { | |
342 | sg = sg_next(sg); | |
343 | dma_addr = sg_dma_address(sg); | |
344 | dma_len = sg_dma_len(sg); | |
345 | } | |
346 | ||
347 | if (length <= PAGE_SIZE) { | |
348 | cmd->prp2 = cpu_to_le64(dma_addr); | |
e025344c SMM |
349 | return prps; |
350 | } | |
351 | ||
352 | nprps = DIV_ROUND_UP(length, PAGE_SIZE); | |
353 | npages = DIV_ROUND_UP(8 * nprps, PAGE_SIZE); | |
354 | prps = kmalloc(sizeof(*prps) + sizeof(__le64 *) * npages, GFP_ATOMIC); | |
e025344c | 355 | prp_page = 0; |
99802a7a MW |
356 | if (nprps <= (256 / 8)) { |
357 | pool = dev->prp_small_pool; | |
358 | prps->npages = 0; | |
359 | } else { | |
360 | pool = dev->prp_page_pool; | |
361 | prps->npages = npages; | |
362 | } | |
363 | ||
364 | prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); | |
e025344c SMM |
365 | prps->list[prp_page++] = prp_list; |
366 | prps->first_dma = prp_dma; | |
367 | cmd->prp2 = cpu_to_le64(prp_dma); | |
368 | i = 0; | |
369 | for (;;) { | |
370 | if (i == PAGE_SIZE / 8 - 1) { | |
371 | __le64 *old_prp_list = prp_list; | |
99802a7a | 372 | prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); |
e025344c SMM |
373 | prps->list[prp_page++] = prp_list; |
374 | old_prp_list[i] = cpu_to_le64(prp_dma); | |
375 | i = 0; | |
376 | } | |
377 | prp_list[i++] = cpu_to_le64(dma_addr); | |
378 | dma_len -= PAGE_SIZE; | |
379 | dma_addr += PAGE_SIZE; | |
380 | length -= PAGE_SIZE; | |
381 | if (length <= 0) | |
382 | break; | |
383 | if (dma_len > 0) | |
384 | continue; | |
385 | BUG_ON(dma_len < 0); | |
386 | sg = sg_next(sg); | |
387 | dma_addr = sg_dma_address(sg); | |
388 | dma_len = sg_dma_len(sg); | |
ff22b54f MW |
389 | } |
390 | ||
e025344c | 391 | return prps; |
ff22b54f MW |
392 | } |
393 | ||
d534df3c | 394 | static int nvme_map_bio(struct device *dev, struct nvme_bio *nbio, |
b60503ba MW |
395 | struct bio *bio, enum dma_data_direction dma_dir, int psegs) |
396 | { | |
397 | struct bio_vec *bvec; | |
d534df3c | 398 | struct scatterlist *sg = nbio->sg; |
b60503ba MW |
399 | int i, nsegs; |
400 | ||
401 | sg_init_table(sg, psegs); | |
402 | bio_for_each_segment(bvec, bio, i) { | |
403 | sg_set_page(sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); | |
51882d00 | 404 | sg++; |
b60503ba MW |
405 | /* XXX: handle non-mergable here */ |
406 | nsegs++; | |
407 | } | |
d534df3c | 408 | nbio->nents = nsegs; |
b60503ba | 409 | |
d534df3c | 410 | return dma_map_sg(dev, nbio->sg, nbio->nents, dma_dir); |
b60503ba MW |
411 | } |
412 | ||
413 | static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns, | |
414 | struct bio *bio) | |
415 | { | |
ff22b54f | 416 | struct nvme_command *cmnd; |
d534df3c | 417 | struct nvme_bio *nbio; |
b60503ba MW |
418 | enum dma_data_direction dma_dir; |
419 | int cmdid; | |
420 | u16 control; | |
421 | u32 dsmgmt; | |
422 | unsigned long flags; | |
423 | int psegs = bio_phys_segments(ns->queue, bio); | |
424 | ||
d534df3c MW |
425 | nbio = alloc_nbio(psegs, GFP_NOIO); |
426 | if (!nbio) | |
b60503ba | 427 | goto congestion; |
d534df3c | 428 | nbio->bio = bio; |
b60503ba | 429 | |
d534df3c | 430 | cmdid = alloc_cmdid(nvmeq, nbio, bio_completion_id, IO_TIMEOUT); |
b60503ba | 431 | if (unlikely(cmdid < 0)) |
d534df3c | 432 | goto free_nbio; |
b60503ba MW |
433 | |
434 | control = 0; | |
435 | if (bio->bi_rw & REQ_FUA) | |
436 | control |= NVME_RW_FUA; | |
437 | if (bio->bi_rw & (REQ_FAILFAST_DEV | REQ_RAHEAD)) | |
438 | control |= NVME_RW_LR; | |
439 | ||
440 | dsmgmt = 0; | |
441 | if (bio->bi_rw & REQ_RAHEAD) | |
442 | dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; | |
443 | ||
444 | spin_lock_irqsave(&nvmeq->q_lock, flags); | |
ff22b54f | 445 | cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; |
b60503ba | 446 | |
b8deb62c | 447 | memset(cmnd, 0, sizeof(*cmnd)); |
b60503ba | 448 | if (bio_data_dir(bio)) { |
ff22b54f | 449 | cmnd->rw.opcode = nvme_cmd_write; |
b60503ba MW |
450 | dma_dir = DMA_TO_DEVICE; |
451 | } else { | |
ff22b54f | 452 | cmnd->rw.opcode = nvme_cmd_read; |
b60503ba MW |
453 | dma_dir = DMA_FROM_DEVICE; |
454 | } | |
455 | ||
d534df3c | 456 | nvme_map_bio(nvmeq->q_dmadev, nbio, bio, dma_dir, psegs); |
b60503ba | 457 | |
ff22b54f MW |
458 | cmnd->rw.flags = 1; |
459 | cmnd->rw.command_id = cmdid; | |
460 | cmnd->rw.nsid = cpu_to_le32(ns->ns_id); | |
d534df3c | 461 | nbio->prps = nvme_setup_prps(nvmeq, &cmnd->common, nbio->sg, |
e025344c | 462 | bio->bi_size); |
ff22b54f MW |
463 | cmnd->rw.slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9)); |
464 | cmnd->rw.length = cpu_to_le16((bio->bi_size >> ns->lba_shift) - 1); | |
465 | cmnd->rw.control = cpu_to_le16(control); | |
466 | cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); | |
b60503ba MW |
467 | |
468 | writel(nvmeq->sq_tail, nvmeq->q_db); | |
469 | if (++nvmeq->sq_tail == nvmeq->q_depth) | |
470 | nvmeq->sq_tail = 0; | |
471 | ||
472 | spin_unlock_irqrestore(&nvmeq->q_lock, flags); | |
473 | ||
474 | return 0; | |
475 | ||
d534df3c MW |
476 | free_nbio: |
477 | free_nbio(nvmeq, nbio); | |
b60503ba MW |
478 | congestion: |
479 | return -EBUSY; | |
480 | } | |
481 | ||
9294bbed MW |
482 | static void nvme_resubmit_bio(struct nvme_queue *nvmeq, struct bio *bio) |
483 | { | |
484 | struct nvme_ns *ns = bio->bi_bdev->bd_disk->private_data; | |
485 | if (nvme_submit_bio_queue(nvmeq, ns, bio)) | |
486 | bio_list_add_head(&nvmeq->sq_cong, bio); | |
487 | else if (bio_list_empty(&nvmeq->sq_cong)) | |
488 | blk_clear_queue_congested(ns->queue, rw_is_sync(bio->bi_rw)); | |
489 | /* XXX: Need to duplicate the logic from __freed_request here */ | |
490 | } | |
491 | ||
b60503ba MW |
492 | /* |
493 | * NB: return value of non-zero would mean that we were a stacking driver. | |
494 | * make_request must always succeed. | |
495 | */ | |
496 | static int nvme_make_request(struct request_queue *q, struct bio *bio) | |
497 | { | |
498 | struct nvme_ns *ns = q->queuedata; | |
499 | struct nvme_queue *nvmeq = get_nvmeq(ns); | |
500 | ||
501 | if (nvme_submit_bio_queue(nvmeq, ns, bio)) { | |
502 | blk_set_queue_congested(q, rw_is_sync(bio->bi_rw)); | |
9294bbed | 503 | spin_lock_irq(&nvmeq->q_lock); |
b60503ba | 504 | bio_list_add(&nvmeq->sq_cong, bio); |
9294bbed | 505 | spin_unlock_irq(&nvmeq->q_lock); |
b60503ba MW |
506 | } |
507 | put_nvmeq(nvmeq); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | struct sync_cmd_info { | |
513 | struct task_struct *task; | |
514 | u32 result; | |
515 | int status; | |
516 | }; | |
517 | ||
518 | static void sync_completion(struct nvme_queue *nvmeq, void *ctx, | |
519 | struct nvme_completion *cqe) | |
520 | { | |
521 | struct sync_cmd_info *cmdinfo = ctx; | |
be7b6275 MW |
522 | if ((unsigned long)cmdinfo == CMD_CTX_CANCELLED) |
523 | return; | |
b36235df MW |
524 | if (unlikely((unsigned long)cmdinfo == CMD_CTX_COMPLETED)) { |
525 | dev_warn(nvmeq->q_dmadev, | |
526 | "completed id %d twice on queue %d\n", | |
527 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
528 | return; | |
529 | } | |
48e3d398 MW |
530 | if (unlikely((unsigned long)cmdinfo == CMD_CTX_INVALID)) { |
531 | dev_warn(nvmeq->q_dmadev, | |
532 | "invalid id %d completed on queue %d\n", | |
533 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
534 | return; | |
535 | } | |
b60503ba MW |
536 | cmdinfo->result = le32_to_cpup(&cqe->result); |
537 | cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; | |
538 | wake_up_process(cmdinfo->task); | |
539 | } | |
540 | ||
541 | typedef void (*completion_fn)(struct nvme_queue *, void *, | |
542 | struct nvme_completion *); | |
543 | ||
544 | static irqreturn_t nvme_process_cq(struct nvme_queue *nvmeq) | |
545 | { | |
82123460 | 546 | u16 head, phase; |
b60503ba MW |
547 | |
548 | static const completion_fn completions[4] = { | |
549 | [sync_completion_id] = sync_completion, | |
550 | [bio_completion_id] = bio_completion, | |
551 | }; | |
552 | ||
553 | head = nvmeq->cq_head; | |
82123460 | 554 | phase = nvmeq->cq_phase; |
b60503ba MW |
555 | |
556 | for (;;) { | |
557 | unsigned long data; | |
558 | void *ptr; | |
559 | unsigned char handler; | |
560 | struct nvme_completion cqe = nvmeq->cqes[head]; | |
82123460 | 561 | if ((le16_to_cpu(cqe.status) & 1) != phase) |
b60503ba MW |
562 | break; |
563 | nvmeq->sq_head = le16_to_cpu(cqe.sq_head); | |
564 | if (++head == nvmeq->q_depth) { | |
565 | head = 0; | |
82123460 | 566 | phase = !phase; |
b60503ba MW |
567 | } |
568 | ||
569 | data = free_cmdid(nvmeq, cqe.command_id); | |
570 | handler = data & 3; | |
571 | ptr = (void *)(data & ~3UL); | |
572 | completions[handler](nvmeq, ptr, &cqe); | |
573 | } | |
574 | ||
575 | /* If the controller ignores the cq head doorbell and continuously | |
576 | * writes to the queue, it is theoretically possible to wrap around | |
577 | * the queue twice and mistakenly return IRQ_NONE. Linux only | |
578 | * requires that 0.1% of your interrupts are handled, so this isn't | |
579 | * a big problem. | |
580 | */ | |
82123460 | 581 | if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) |
b60503ba MW |
582 | return IRQ_NONE; |
583 | ||
584 | writel(head, nvmeq->q_db + 1); | |
585 | nvmeq->cq_head = head; | |
82123460 | 586 | nvmeq->cq_phase = phase; |
b60503ba MW |
587 | |
588 | return IRQ_HANDLED; | |
589 | } | |
590 | ||
591 | static irqreturn_t nvme_irq(int irq, void *data) | |
58ffacb5 MW |
592 | { |
593 | irqreturn_t result; | |
594 | struct nvme_queue *nvmeq = data; | |
595 | spin_lock(&nvmeq->q_lock); | |
596 | result = nvme_process_cq(nvmeq); | |
597 | spin_unlock(&nvmeq->q_lock); | |
598 | return result; | |
599 | } | |
600 | ||
601 | static irqreturn_t nvme_irq_check(int irq, void *data) | |
602 | { | |
603 | struct nvme_queue *nvmeq = data; | |
604 | struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; | |
605 | if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) | |
606 | return IRQ_NONE; | |
607 | return IRQ_WAKE_THREAD; | |
608 | } | |
609 | ||
3c0cf138 MW |
610 | static void nvme_abort_command(struct nvme_queue *nvmeq, int cmdid) |
611 | { | |
612 | spin_lock_irq(&nvmeq->q_lock); | |
be7b6275 | 613 | cancel_cmdid_data(nvmeq, cmdid); |
3c0cf138 MW |
614 | spin_unlock_irq(&nvmeq->q_lock); |
615 | } | |
616 | ||
b60503ba MW |
617 | /* |
618 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
619 | * if the result is positive, it's an NVM Express status code | |
620 | */ | |
3c0cf138 | 621 | static int nvme_submit_sync_cmd(struct nvme_queue *nvmeq, |
e85248e5 | 622 | struct nvme_command *cmd, u32 *result, unsigned timeout) |
b60503ba MW |
623 | { |
624 | int cmdid; | |
625 | struct sync_cmd_info cmdinfo; | |
626 | ||
627 | cmdinfo.task = current; | |
628 | cmdinfo.status = -EINTR; | |
629 | ||
e85248e5 MW |
630 | cmdid = alloc_cmdid_killable(nvmeq, &cmdinfo, sync_completion_id, |
631 | timeout); | |
b60503ba MW |
632 | if (cmdid < 0) |
633 | return cmdid; | |
634 | cmd->common.command_id = cmdid; | |
635 | ||
3c0cf138 MW |
636 | set_current_state(TASK_KILLABLE); |
637 | nvme_submit_cmd(nvmeq, cmd); | |
b60503ba MW |
638 | schedule(); |
639 | ||
3c0cf138 MW |
640 | if (cmdinfo.status == -EINTR) { |
641 | nvme_abort_command(nvmeq, cmdid); | |
642 | return -EINTR; | |
643 | } | |
644 | ||
b60503ba MW |
645 | if (result) |
646 | *result = cmdinfo.result; | |
647 | ||
648 | return cmdinfo.status; | |
649 | } | |
650 | ||
651 | static int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd, | |
652 | u32 *result) | |
653 | { | |
e85248e5 | 654 | return nvme_submit_sync_cmd(dev->queues[0], cmd, result, ADMIN_TIMEOUT); |
b60503ba MW |
655 | } |
656 | ||
657 | static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) | |
658 | { | |
659 | int status; | |
660 | struct nvme_command c; | |
661 | ||
662 | memset(&c, 0, sizeof(c)); | |
663 | c.delete_queue.opcode = opcode; | |
664 | c.delete_queue.qid = cpu_to_le16(id); | |
665 | ||
666 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
667 | if (status) | |
668 | return -EIO; | |
669 | return 0; | |
670 | } | |
671 | ||
672 | static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, | |
673 | struct nvme_queue *nvmeq) | |
674 | { | |
675 | int status; | |
676 | struct nvme_command c; | |
677 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; | |
678 | ||
679 | memset(&c, 0, sizeof(c)); | |
680 | c.create_cq.opcode = nvme_admin_create_cq; | |
681 | c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); | |
682 | c.create_cq.cqid = cpu_to_le16(qid); | |
683 | c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
684 | c.create_cq.cq_flags = cpu_to_le16(flags); | |
685 | c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); | |
686 | ||
687 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
688 | if (status) | |
689 | return -EIO; | |
690 | return 0; | |
691 | } | |
692 | ||
693 | static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, | |
694 | struct nvme_queue *nvmeq) | |
695 | { | |
696 | int status; | |
697 | struct nvme_command c; | |
698 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; | |
699 | ||
700 | memset(&c, 0, sizeof(c)); | |
701 | c.create_sq.opcode = nvme_admin_create_sq; | |
702 | c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); | |
703 | c.create_sq.sqid = cpu_to_le16(qid); | |
704 | c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
705 | c.create_sq.sq_flags = cpu_to_le16(flags); | |
706 | c.create_sq.cqid = cpu_to_le16(qid); | |
707 | ||
708 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
709 | if (status) | |
710 | return -EIO; | |
711 | return 0; | |
712 | } | |
713 | ||
714 | static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) | |
715 | { | |
716 | return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); | |
717 | } | |
718 | ||
719 | static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) | |
720 | { | |
721 | return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); | |
722 | } | |
723 | ||
724 | static void nvme_free_queue(struct nvme_dev *dev, int qid) | |
725 | { | |
726 | struct nvme_queue *nvmeq = dev->queues[qid]; | |
727 | ||
728 | free_irq(dev->entry[nvmeq->cq_vector].vector, nvmeq); | |
729 | ||
730 | /* Don't tell the adapter to delete the admin queue */ | |
731 | if (qid) { | |
732 | adapter_delete_sq(dev, qid); | |
733 | adapter_delete_cq(dev, qid); | |
734 | } | |
735 | ||
736 | dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), | |
737 | (void *)nvmeq->cqes, nvmeq->cq_dma_addr); | |
738 | dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), | |
739 | nvmeq->sq_cmds, nvmeq->sq_dma_addr); | |
740 | kfree(nvmeq); | |
741 | } | |
742 | ||
743 | static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, | |
744 | int depth, int vector) | |
745 | { | |
746 | struct device *dmadev = &dev->pci_dev->dev; | |
e85248e5 | 747 | unsigned extra = (depth / 8) + (depth * sizeof(struct nvme_cmd_info)); |
b60503ba MW |
748 | struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL); |
749 | if (!nvmeq) | |
750 | return NULL; | |
751 | ||
752 | nvmeq->cqes = dma_alloc_coherent(dmadev, CQ_SIZE(depth), | |
753 | &nvmeq->cq_dma_addr, GFP_KERNEL); | |
754 | if (!nvmeq->cqes) | |
755 | goto free_nvmeq; | |
756 | memset((void *)nvmeq->cqes, 0, CQ_SIZE(depth)); | |
757 | ||
758 | nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth), | |
759 | &nvmeq->sq_dma_addr, GFP_KERNEL); | |
760 | if (!nvmeq->sq_cmds) | |
761 | goto free_cqdma; | |
762 | ||
763 | nvmeq->q_dmadev = dmadev; | |
091b6092 | 764 | nvmeq->dev = dev; |
b60503ba MW |
765 | spin_lock_init(&nvmeq->q_lock); |
766 | nvmeq->cq_head = 0; | |
82123460 | 767 | nvmeq->cq_phase = 1; |
b60503ba MW |
768 | init_waitqueue_head(&nvmeq->sq_full); |
769 | bio_list_init(&nvmeq->sq_cong); | |
770 | nvmeq->q_db = &dev->dbs[qid * 2]; | |
771 | nvmeq->q_depth = depth; | |
772 | nvmeq->cq_vector = vector; | |
773 | ||
774 | return nvmeq; | |
775 | ||
776 | free_cqdma: | |
777 | dma_free_coherent(dmadev, CQ_SIZE(nvmeq->q_depth), (void *)nvmeq->cqes, | |
778 | nvmeq->cq_dma_addr); | |
779 | free_nvmeq: | |
780 | kfree(nvmeq); | |
781 | return NULL; | |
782 | } | |
783 | ||
3001082c MW |
784 | static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, |
785 | const char *name) | |
786 | { | |
58ffacb5 MW |
787 | if (use_threaded_interrupts) |
788 | return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, | |
ec6ce618 | 789 | nvme_irq_check, nvme_irq, |
58ffacb5 MW |
790 | IRQF_DISABLED | IRQF_SHARED, |
791 | name, nvmeq); | |
3001082c MW |
792 | return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, |
793 | IRQF_DISABLED | IRQF_SHARED, name, nvmeq); | |
794 | } | |
795 | ||
b60503ba MW |
796 | static __devinit struct nvme_queue *nvme_create_queue(struct nvme_dev *dev, |
797 | int qid, int cq_size, int vector) | |
798 | { | |
799 | int result; | |
800 | struct nvme_queue *nvmeq = nvme_alloc_queue(dev, qid, cq_size, vector); | |
801 | ||
3f85d50b MW |
802 | if (!nvmeq) |
803 | return NULL; | |
804 | ||
b60503ba MW |
805 | result = adapter_alloc_cq(dev, qid, nvmeq); |
806 | if (result < 0) | |
807 | goto free_nvmeq; | |
808 | ||
809 | result = adapter_alloc_sq(dev, qid, nvmeq); | |
810 | if (result < 0) | |
811 | goto release_cq; | |
812 | ||
3001082c | 813 | result = queue_request_irq(dev, nvmeq, "nvme"); |
b60503ba MW |
814 | if (result < 0) |
815 | goto release_sq; | |
816 | ||
817 | return nvmeq; | |
818 | ||
819 | release_sq: | |
820 | adapter_delete_sq(dev, qid); | |
821 | release_cq: | |
822 | adapter_delete_cq(dev, qid); | |
823 | free_nvmeq: | |
824 | dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), | |
825 | (void *)nvmeq->cqes, nvmeq->cq_dma_addr); | |
826 | dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), | |
827 | nvmeq->sq_cmds, nvmeq->sq_dma_addr); | |
828 | kfree(nvmeq); | |
829 | return NULL; | |
830 | } | |
831 | ||
832 | static int __devinit nvme_configure_admin_queue(struct nvme_dev *dev) | |
833 | { | |
834 | int result; | |
835 | u32 aqa; | |
836 | struct nvme_queue *nvmeq; | |
837 | ||
838 | dev->dbs = ((void __iomem *)dev->bar) + 4096; | |
839 | ||
840 | nvmeq = nvme_alloc_queue(dev, 0, 64, 0); | |
3f85d50b MW |
841 | if (!nvmeq) |
842 | return -ENOMEM; | |
b60503ba MW |
843 | |
844 | aqa = nvmeq->q_depth - 1; | |
845 | aqa |= aqa << 16; | |
846 | ||
847 | dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM; | |
848 | dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT; | |
849 | dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; | |
850 | ||
5911f200 | 851 | writel(0, &dev->bar->cc); |
b60503ba MW |
852 | writel(aqa, &dev->bar->aqa); |
853 | writeq(nvmeq->sq_dma_addr, &dev->bar->asq); | |
854 | writeq(nvmeq->cq_dma_addr, &dev->bar->acq); | |
855 | writel(dev->ctrl_config, &dev->bar->cc); | |
856 | ||
857 | while (!(readl(&dev->bar->csts) & NVME_CSTS_RDY)) { | |
858 | msleep(100); | |
859 | if (fatal_signal_pending(current)) | |
860 | return -EINTR; | |
861 | } | |
862 | ||
3001082c | 863 | result = queue_request_irq(dev, nvmeq, "nvme admin"); |
b60503ba MW |
864 | dev->queues[0] = nvmeq; |
865 | return result; | |
866 | } | |
867 | ||
7fc3cdab MW |
868 | static int nvme_map_user_pages(struct nvme_dev *dev, int write, |
869 | unsigned long addr, unsigned length, | |
870 | struct scatterlist **sgp) | |
b60503ba | 871 | { |
36c14ed9 | 872 | int i, err, count, nents, offset; |
7fc3cdab MW |
873 | struct scatterlist *sg; |
874 | struct page **pages; | |
36c14ed9 MW |
875 | |
876 | if (addr & 3) | |
877 | return -EINVAL; | |
7fc3cdab MW |
878 | if (!length) |
879 | return -EINVAL; | |
880 | ||
36c14ed9 | 881 | offset = offset_in_page(addr); |
7fc3cdab MW |
882 | count = DIV_ROUND_UP(offset + length, PAGE_SIZE); |
883 | pages = kcalloc(count, sizeof(*pages), GFP_KERNEL); | |
36c14ed9 MW |
884 | |
885 | err = get_user_pages_fast(addr, count, 1, pages); | |
886 | if (err < count) { | |
887 | count = err; | |
888 | err = -EFAULT; | |
889 | goto put_pages; | |
890 | } | |
7fc3cdab MW |
891 | |
892 | sg = kcalloc(count, sizeof(*sg), GFP_KERNEL); | |
36c14ed9 | 893 | sg_init_table(sg, count); |
ff22b54f | 894 | sg_set_page(&sg[0], pages[0], PAGE_SIZE - offset, offset); |
7fc3cdab MW |
895 | length -= (PAGE_SIZE - offset); |
896 | for (i = 1; i < count; i++) { | |
897 | sg_set_page(&sg[i], pages[i], min_t(int, length, PAGE_SIZE), 0); | |
898 | length -= PAGE_SIZE; | |
899 | } | |
900 | ||
901 | err = -ENOMEM; | |
902 | nents = dma_map_sg(&dev->pci_dev->dev, sg, count, | |
903 | write ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
36c14ed9 MW |
904 | if (!nents) |
905 | goto put_pages; | |
b60503ba | 906 | |
7fc3cdab MW |
907 | kfree(pages); |
908 | *sgp = sg; | |
909 | return nents; | |
b60503ba | 910 | |
7fc3cdab MW |
911 | put_pages: |
912 | for (i = 0; i < count; i++) | |
913 | put_page(pages[i]); | |
914 | kfree(pages); | |
915 | return err; | |
916 | } | |
b60503ba | 917 | |
7fc3cdab MW |
918 | static void nvme_unmap_user_pages(struct nvme_dev *dev, int write, |
919 | unsigned long addr, int length, | |
920 | struct scatterlist *sg, int nents) | |
921 | { | |
922 | int i, count; | |
b60503ba | 923 | |
7fc3cdab | 924 | count = DIV_ROUND_UP(offset_in_page(addr) + length, PAGE_SIZE); |
36c14ed9 | 925 | dma_unmap_sg(&dev->pci_dev->dev, sg, nents, DMA_FROM_DEVICE); |
7fc3cdab | 926 | |
36c14ed9 | 927 | for (i = 0; i < count; i++) |
7fc3cdab MW |
928 | put_page(sg_page(&sg[i])); |
929 | } | |
b60503ba | 930 | |
7fc3cdab MW |
931 | static int nvme_submit_user_admin_command(struct nvme_dev *dev, |
932 | unsigned long addr, unsigned length, | |
933 | struct nvme_command *cmd) | |
934 | { | |
935 | int err, nents; | |
936 | struct scatterlist *sg; | |
e025344c | 937 | struct nvme_prps *prps; |
7fc3cdab MW |
938 | |
939 | nents = nvme_map_user_pages(dev, 0, addr, length, &sg); | |
940 | if (nents < 0) | |
941 | return nents; | |
e025344c | 942 | prps = nvme_setup_prps(dev->queues[0], &cmd->common, sg, length); |
7fc3cdab MW |
943 | err = nvme_submit_admin_cmd(dev, cmd, NULL); |
944 | nvme_unmap_user_pages(dev, 0, addr, length, sg, nents); | |
e025344c | 945 | nvme_free_prps(dev->queues[0], prps); |
7fc3cdab | 946 | return err ? -EIO : 0; |
b60503ba MW |
947 | } |
948 | ||
bd38c555 | 949 | static int nvme_identify(struct nvme_ns *ns, unsigned long addr, int cns) |
b60503ba | 950 | { |
b60503ba | 951 | struct nvme_command c; |
b60503ba | 952 | |
bd38c555 MW |
953 | memset(&c, 0, sizeof(c)); |
954 | c.identify.opcode = nvme_admin_identify; | |
955 | c.identify.nsid = cns ? 0 : cpu_to_le32(ns->ns_id); | |
956 | c.identify.cns = cpu_to_le32(cns); | |
957 | ||
958 | return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c); | |
959 | } | |
960 | ||
961 | static int nvme_get_range_type(struct nvme_ns *ns, unsigned long addr) | |
962 | { | |
963 | struct nvme_command c; | |
b60503ba MW |
964 | |
965 | memset(&c, 0, sizeof(c)); | |
966 | c.features.opcode = nvme_admin_get_features; | |
967 | c.features.nsid = cpu_to_le32(ns->ns_id); | |
b60503ba MW |
968 | c.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE); |
969 | ||
bd38c555 | 970 | return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c); |
b60503ba MW |
971 | } |
972 | ||
a53295b6 MW |
973 | static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) |
974 | { | |
975 | struct nvme_dev *dev = ns->dev; | |
976 | struct nvme_queue *nvmeq; | |
977 | struct nvme_user_io io; | |
978 | struct nvme_command c; | |
979 | unsigned length; | |
980 | u32 result; | |
981 | int nents, status; | |
982 | struct scatterlist *sg; | |
e025344c | 983 | struct nvme_prps *prps; |
a53295b6 MW |
984 | |
985 | if (copy_from_user(&io, uio, sizeof(io))) | |
986 | return -EFAULT; | |
987 | length = io.nblocks << io.block_shift; | |
988 | nents = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length, &sg); | |
989 | if (nents < 0) | |
990 | return nents; | |
991 | ||
992 | memset(&c, 0, sizeof(c)); | |
993 | c.rw.opcode = io.opcode; | |
994 | c.rw.flags = io.flags; | |
995 | c.rw.nsid = cpu_to_le32(io.nsid); | |
996 | c.rw.slba = cpu_to_le64(io.slba); | |
997 | c.rw.length = cpu_to_le16(io.nblocks - 1); | |
998 | c.rw.control = cpu_to_le16(io.control); | |
999 | c.rw.dsmgmt = cpu_to_le16(io.dsmgmt); | |
1000 | c.rw.reftag = cpu_to_le32(io.reftag); /* XXX: endian? */ | |
1001 | c.rw.apptag = cpu_to_le16(io.apptag); | |
1002 | c.rw.appmask = cpu_to_le16(io.appmask); | |
e025344c | 1003 | nvmeq = get_nvmeq(ns); |
a53295b6 | 1004 | /* XXX: metadata */ |
e025344c | 1005 | prps = nvme_setup_prps(nvmeq, &c.common, sg, length); |
a53295b6 | 1006 | |
b1ad37ef MW |
1007 | /* Since nvme_submit_sync_cmd sleeps, we can't keep preemption |
1008 | * disabled. We may be preempted at any point, and be rescheduled | |
1009 | * to a different CPU. That will cause cacheline bouncing, but no | |
1010 | * additional races since q_lock already protects against other CPUs. | |
1011 | */ | |
a53295b6 | 1012 | put_nvmeq(nvmeq); |
e85248e5 | 1013 | status = nvme_submit_sync_cmd(nvmeq, &c, &result, IO_TIMEOUT); |
a53295b6 MW |
1014 | |
1015 | nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg, nents); | |
e025344c | 1016 | nvme_free_prps(nvmeq, prps); |
a53295b6 MW |
1017 | put_user(result, &uio->result); |
1018 | return status; | |
1019 | } | |
1020 | ||
6ee44cdc MW |
1021 | static int nvme_download_firmware(struct nvme_ns *ns, |
1022 | struct nvme_dlfw __user *udlfw) | |
1023 | { | |
1024 | struct nvme_dev *dev = ns->dev; | |
1025 | struct nvme_dlfw dlfw; | |
1026 | struct nvme_command c; | |
1027 | int nents, status; | |
1028 | struct scatterlist *sg; | |
e025344c | 1029 | struct nvme_prps *prps; |
6ee44cdc MW |
1030 | |
1031 | if (copy_from_user(&dlfw, udlfw, sizeof(dlfw))) | |
1032 | return -EFAULT; | |
1033 | if (dlfw.length >= (1 << 30)) | |
1034 | return -EINVAL; | |
1035 | ||
1036 | nents = nvme_map_user_pages(dev, 1, dlfw.addr, dlfw.length * 4, &sg); | |
1037 | if (nents < 0) | |
1038 | return nents; | |
1039 | ||
1040 | memset(&c, 0, sizeof(c)); | |
1041 | c.dlfw.opcode = nvme_admin_download_fw; | |
1042 | c.dlfw.numd = cpu_to_le32(dlfw.length); | |
1043 | c.dlfw.offset = cpu_to_le32(dlfw.offset); | |
e025344c | 1044 | prps = nvme_setup_prps(dev->queues[0], &c.common, sg, dlfw.length * 4); |
6ee44cdc MW |
1045 | |
1046 | status = nvme_submit_admin_cmd(dev, &c, NULL); | |
1047 | nvme_unmap_user_pages(dev, 0, dlfw.addr, dlfw.length * 4, sg, nents); | |
e025344c | 1048 | nvme_free_prps(dev->queues[0], prps); |
6ee44cdc MW |
1049 | return status; |
1050 | } | |
1051 | ||
1052 | static int nvme_activate_firmware(struct nvme_ns *ns, unsigned long arg) | |
1053 | { | |
1054 | struct nvme_dev *dev = ns->dev; | |
1055 | struct nvme_command c; | |
1056 | ||
1057 | memset(&c, 0, sizeof(c)); | |
1058 | c.common.opcode = nvme_admin_activate_fw; | |
1059 | c.common.rsvd10[0] = cpu_to_le32(arg); | |
1060 | ||
1061 | return nvme_submit_admin_cmd(dev, &c, NULL); | |
1062 | } | |
1063 | ||
b60503ba MW |
1064 | static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, |
1065 | unsigned long arg) | |
1066 | { | |
1067 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
1068 | ||
1069 | switch (cmd) { | |
1070 | case NVME_IOCTL_IDENTIFY_NS: | |
36c14ed9 | 1071 | return nvme_identify(ns, arg, 0); |
b60503ba | 1072 | case NVME_IOCTL_IDENTIFY_CTRL: |
36c14ed9 | 1073 | return nvme_identify(ns, arg, 1); |
b60503ba | 1074 | case NVME_IOCTL_GET_RANGE_TYPE: |
bd38c555 | 1075 | return nvme_get_range_type(ns, arg); |
a53295b6 MW |
1076 | case NVME_IOCTL_SUBMIT_IO: |
1077 | return nvme_submit_io(ns, (void __user *)arg); | |
6ee44cdc MW |
1078 | case NVME_IOCTL_DOWNLOAD_FW: |
1079 | return nvme_download_firmware(ns, (void __user *)arg); | |
1080 | case NVME_IOCTL_ACTIVATE_FW: | |
1081 | return nvme_activate_firmware(ns, arg); | |
b60503ba MW |
1082 | default: |
1083 | return -ENOTTY; | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | static const struct block_device_operations nvme_fops = { | |
1088 | .owner = THIS_MODULE, | |
1089 | .ioctl = nvme_ioctl, | |
1090 | }; | |
1091 | ||
1092 | static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int index, | |
1093 | struct nvme_id_ns *id, struct nvme_lba_range_type *rt) | |
1094 | { | |
1095 | struct nvme_ns *ns; | |
1096 | struct gendisk *disk; | |
1097 | int lbaf; | |
1098 | ||
1099 | if (rt->attributes & NVME_LBART_ATTRIB_HIDE) | |
1100 | return NULL; | |
1101 | ||
1102 | ns = kzalloc(sizeof(*ns), GFP_KERNEL); | |
1103 | if (!ns) | |
1104 | return NULL; | |
1105 | ns->queue = blk_alloc_queue(GFP_KERNEL); | |
1106 | if (!ns->queue) | |
1107 | goto out_free_ns; | |
1108 | ns->queue->queue_flags = QUEUE_FLAG_DEFAULT | QUEUE_FLAG_NOMERGES | | |
1109 | QUEUE_FLAG_NONROT | QUEUE_FLAG_DISCARD; | |
1110 | blk_queue_make_request(ns->queue, nvme_make_request); | |
1111 | ns->dev = dev; | |
1112 | ns->queue->queuedata = ns; | |
1113 | ||
1114 | disk = alloc_disk(NVME_MINORS); | |
1115 | if (!disk) | |
1116 | goto out_free_queue; | |
1117 | ns->ns_id = index; | |
1118 | ns->disk = disk; | |
1119 | lbaf = id->flbas & 0xf; | |
1120 | ns->lba_shift = id->lbaf[lbaf].ds; | |
1121 | ||
1122 | disk->major = nvme_major; | |
1123 | disk->minors = NVME_MINORS; | |
1124 | disk->first_minor = NVME_MINORS * index; | |
1125 | disk->fops = &nvme_fops; | |
1126 | disk->private_data = ns; | |
1127 | disk->queue = ns->queue; | |
388f037f | 1128 | disk->driverfs_dev = &dev->pci_dev->dev; |
b60503ba MW |
1129 | sprintf(disk->disk_name, "nvme%dn%d", dev->instance, index); |
1130 | set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); | |
1131 | ||
1132 | return ns; | |
1133 | ||
1134 | out_free_queue: | |
1135 | blk_cleanup_queue(ns->queue); | |
1136 | out_free_ns: | |
1137 | kfree(ns); | |
1138 | return NULL; | |
1139 | } | |
1140 | ||
1141 | static void nvme_ns_free(struct nvme_ns *ns) | |
1142 | { | |
1143 | put_disk(ns->disk); | |
1144 | blk_cleanup_queue(ns->queue); | |
1145 | kfree(ns); | |
1146 | } | |
1147 | ||
b3b06812 | 1148 | static int set_queue_count(struct nvme_dev *dev, int count) |
b60503ba MW |
1149 | { |
1150 | int status; | |
1151 | u32 result; | |
1152 | struct nvme_command c; | |
b3b06812 | 1153 | u32 q_count = (count - 1) | ((count - 1) << 16); |
b60503ba MW |
1154 | |
1155 | memset(&c, 0, sizeof(c)); | |
1156 | c.features.opcode = nvme_admin_get_features; | |
1157 | c.features.fid = cpu_to_le32(NVME_FEAT_NUM_QUEUES); | |
1158 | c.features.dword11 = cpu_to_le32(q_count); | |
1159 | ||
1160 | status = nvme_submit_admin_cmd(dev, &c, &result); | |
1161 | if (status) | |
1162 | return -EIO; | |
1163 | return min(result & 0xffff, result >> 16) + 1; | |
1164 | } | |
1165 | ||
b60503ba MW |
1166 | static int __devinit nvme_setup_io_queues(struct nvme_dev *dev) |
1167 | { | |
1b23484b | 1168 | int result, cpu, i, nr_queues; |
b60503ba | 1169 | |
1b23484b MW |
1170 | nr_queues = num_online_cpus(); |
1171 | result = set_queue_count(dev, nr_queues); | |
1172 | if (result < 0) | |
1173 | return result; | |
1174 | if (result < nr_queues) | |
1175 | nr_queues = result; | |
b60503ba | 1176 | |
1b23484b MW |
1177 | /* Deregister the admin queue's interrupt */ |
1178 | free_irq(dev->entry[0].vector, dev->queues[0]); | |
1179 | ||
1180 | for (i = 0; i < nr_queues; i++) | |
1181 | dev->entry[i].entry = i; | |
1182 | for (;;) { | |
1183 | result = pci_enable_msix(dev->pci_dev, dev->entry, nr_queues); | |
1184 | if (result == 0) { | |
1185 | break; | |
1186 | } else if (result > 0) { | |
1187 | nr_queues = result; | |
1188 | continue; | |
1189 | } else { | |
1190 | nr_queues = 1; | |
1191 | break; | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | result = queue_request_irq(dev, dev->queues[0], "nvme admin"); | |
1196 | /* XXX: handle failure here */ | |
1197 | ||
1198 | cpu = cpumask_first(cpu_online_mask); | |
1199 | for (i = 0; i < nr_queues; i++) { | |
1200 | irq_set_affinity_hint(dev->entry[i].vector, get_cpu_mask(cpu)); | |
1201 | cpu = cpumask_next(cpu, cpu_online_mask); | |
1202 | } | |
1203 | ||
1204 | for (i = 0; i < nr_queues; i++) { | |
1205 | dev->queues[i + 1] = nvme_create_queue(dev, i + 1, | |
1206 | NVME_Q_DEPTH, i); | |
1207 | if (!dev->queues[i + 1]) | |
1208 | return -ENOMEM; | |
1209 | dev->queue_count++; | |
1210 | } | |
b60503ba MW |
1211 | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | static void nvme_free_queues(struct nvme_dev *dev) | |
1216 | { | |
1217 | int i; | |
1218 | ||
1219 | for (i = dev->queue_count - 1; i >= 0; i--) | |
1220 | nvme_free_queue(dev, i); | |
1221 | } | |
1222 | ||
1223 | static int __devinit nvme_dev_add(struct nvme_dev *dev) | |
1224 | { | |
1225 | int res, nn, i; | |
1226 | struct nvme_ns *ns, *next; | |
51814232 | 1227 | struct nvme_id_ctrl *ctrl; |
b60503ba MW |
1228 | void *id; |
1229 | dma_addr_t dma_addr; | |
1230 | struct nvme_command cid, crt; | |
1231 | ||
1232 | res = nvme_setup_io_queues(dev); | |
1233 | if (res) | |
1234 | return res; | |
1235 | ||
1236 | /* XXX: Switch to a SG list once prp2 works */ | |
1237 | id = dma_alloc_coherent(&dev->pci_dev->dev, 8192, &dma_addr, | |
1238 | GFP_KERNEL); | |
1239 | ||
1240 | memset(&cid, 0, sizeof(cid)); | |
1241 | cid.identify.opcode = nvme_admin_identify; | |
1242 | cid.identify.nsid = 0; | |
1243 | cid.identify.prp1 = cpu_to_le64(dma_addr); | |
1244 | cid.identify.cns = cpu_to_le32(1); | |
1245 | ||
1246 | res = nvme_submit_admin_cmd(dev, &cid, NULL); | |
1247 | if (res) { | |
1248 | res = -EIO; | |
1249 | goto out_free; | |
1250 | } | |
1251 | ||
51814232 MW |
1252 | ctrl = id; |
1253 | nn = le32_to_cpup(&ctrl->nn); | |
1254 | memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn)); | |
1255 | memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn)); | |
1256 | memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr)); | |
b60503ba MW |
1257 | |
1258 | cid.identify.cns = 0; | |
1259 | memset(&crt, 0, sizeof(crt)); | |
1260 | crt.features.opcode = nvme_admin_get_features; | |
1261 | crt.features.prp1 = cpu_to_le64(dma_addr + 4096); | |
1262 | crt.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE); | |
1263 | ||
1264 | for (i = 0; i < nn; i++) { | |
1265 | cid.identify.nsid = cpu_to_le32(i); | |
1266 | res = nvme_submit_admin_cmd(dev, &cid, NULL); | |
1267 | if (res) | |
1268 | continue; | |
1269 | ||
1270 | if (((struct nvme_id_ns *)id)->ncap == 0) | |
1271 | continue; | |
1272 | ||
1273 | crt.features.nsid = cpu_to_le32(i); | |
1274 | res = nvme_submit_admin_cmd(dev, &crt, NULL); | |
1275 | if (res) | |
1276 | continue; | |
1277 | ||
1278 | ns = nvme_alloc_ns(dev, i, id, id + 4096); | |
1279 | if (ns) | |
1280 | list_add_tail(&ns->list, &dev->namespaces); | |
1281 | } | |
1282 | list_for_each_entry(ns, &dev->namespaces, list) | |
1283 | add_disk(ns->disk); | |
1284 | ||
1285 | dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr); | |
1286 | return 0; | |
1287 | ||
1288 | out_free: | |
1289 | list_for_each_entry_safe(ns, next, &dev->namespaces, list) { | |
1290 | list_del(&ns->list); | |
1291 | nvme_ns_free(ns); | |
1292 | } | |
1293 | ||
1294 | dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr); | |
1295 | return res; | |
1296 | } | |
1297 | ||
1298 | static int nvme_dev_remove(struct nvme_dev *dev) | |
1299 | { | |
1300 | struct nvme_ns *ns, *next; | |
1301 | ||
1302 | /* TODO: wait all I/O finished or cancel them */ | |
1303 | ||
1304 | list_for_each_entry_safe(ns, next, &dev->namespaces, list) { | |
1305 | list_del(&ns->list); | |
1306 | del_gendisk(ns->disk); | |
1307 | nvme_ns_free(ns); | |
1308 | } | |
1309 | ||
1310 | nvme_free_queues(dev); | |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
091b6092 MW |
1315 | static int nvme_setup_prp_pools(struct nvme_dev *dev) |
1316 | { | |
1317 | struct device *dmadev = &dev->pci_dev->dev; | |
1318 | dev->prp_page_pool = dma_pool_create("prp list page", dmadev, | |
1319 | PAGE_SIZE, PAGE_SIZE, 0); | |
1320 | if (!dev->prp_page_pool) | |
1321 | return -ENOMEM; | |
1322 | ||
99802a7a MW |
1323 | /* Optimisation for I/Os between 4k and 128k */ |
1324 | dev->prp_small_pool = dma_pool_create("prp list 256", dmadev, | |
1325 | 256, 256, 0); | |
1326 | if (!dev->prp_small_pool) { | |
1327 | dma_pool_destroy(dev->prp_page_pool); | |
1328 | return -ENOMEM; | |
1329 | } | |
091b6092 MW |
1330 | return 0; |
1331 | } | |
1332 | ||
1333 | static void nvme_release_prp_pools(struct nvme_dev *dev) | |
1334 | { | |
1335 | dma_pool_destroy(dev->prp_page_pool); | |
99802a7a | 1336 | dma_pool_destroy(dev->prp_small_pool); |
091b6092 MW |
1337 | } |
1338 | ||
b60503ba MW |
1339 | /* XXX: Use an ida or something to let remove / add work correctly */ |
1340 | static void nvme_set_instance(struct nvme_dev *dev) | |
1341 | { | |
1342 | static int instance; | |
1343 | dev->instance = instance++; | |
1344 | } | |
1345 | ||
1346 | static void nvme_release_instance(struct nvme_dev *dev) | |
1347 | { | |
1348 | } | |
1349 | ||
1350 | static int __devinit nvme_probe(struct pci_dev *pdev, | |
1351 | const struct pci_device_id *id) | |
1352 | { | |
574e8b95 | 1353 | int bars, result = -ENOMEM; |
b60503ba MW |
1354 | struct nvme_dev *dev; |
1355 | ||
1356 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1357 | if (!dev) | |
1358 | return -ENOMEM; | |
1359 | dev->entry = kcalloc(num_possible_cpus(), sizeof(*dev->entry), | |
1360 | GFP_KERNEL); | |
1361 | if (!dev->entry) | |
1362 | goto free; | |
1b23484b MW |
1363 | dev->queues = kcalloc(num_possible_cpus() + 1, sizeof(void *), |
1364 | GFP_KERNEL); | |
b60503ba MW |
1365 | if (!dev->queues) |
1366 | goto free; | |
1367 | ||
0ee5a7d7 SMM |
1368 | if (pci_enable_device_mem(pdev)) |
1369 | goto free; | |
f64d3365 | 1370 | pci_set_master(pdev); |
574e8b95 MW |
1371 | bars = pci_select_bars(pdev, IORESOURCE_MEM); |
1372 | if (pci_request_selected_regions(pdev, bars, "nvme")) | |
1373 | goto disable; | |
0ee5a7d7 | 1374 | |
b60503ba MW |
1375 | INIT_LIST_HEAD(&dev->namespaces); |
1376 | dev->pci_dev = pdev; | |
1377 | pci_set_drvdata(pdev, dev); | |
2930353f MW |
1378 | dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); |
1379 | dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); | |
b60503ba | 1380 | nvme_set_instance(dev); |
53c9577e | 1381 | dev->entry[0].vector = pdev->irq; |
b60503ba | 1382 | |
091b6092 MW |
1383 | result = nvme_setup_prp_pools(dev); |
1384 | if (result) | |
1385 | goto disable_msix; | |
1386 | ||
b60503ba MW |
1387 | dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); |
1388 | if (!dev->bar) { | |
1389 | result = -ENOMEM; | |
574e8b95 | 1390 | goto disable_msix; |
b60503ba MW |
1391 | } |
1392 | ||
1393 | result = nvme_configure_admin_queue(dev); | |
1394 | if (result) | |
1395 | goto unmap; | |
1396 | dev->queue_count++; | |
1397 | ||
1398 | result = nvme_dev_add(dev); | |
1399 | if (result) | |
1400 | goto delete; | |
1401 | return 0; | |
1402 | ||
1403 | delete: | |
1404 | nvme_free_queues(dev); | |
1405 | unmap: | |
1406 | iounmap(dev->bar); | |
574e8b95 | 1407 | disable_msix: |
b60503ba MW |
1408 | pci_disable_msix(pdev); |
1409 | nvme_release_instance(dev); | |
091b6092 | 1410 | nvme_release_prp_pools(dev); |
574e8b95 | 1411 | disable: |
0ee5a7d7 | 1412 | pci_disable_device(pdev); |
574e8b95 | 1413 | pci_release_regions(pdev); |
b60503ba MW |
1414 | free: |
1415 | kfree(dev->queues); | |
1416 | kfree(dev->entry); | |
1417 | kfree(dev); | |
1418 | return result; | |
1419 | } | |
1420 | ||
1421 | static void __devexit nvme_remove(struct pci_dev *pdev) | |
1422 | { | |
1423 | struct nvme_dev *dev = pci_get_drvdata(pdev); | |
1424 | nvme_dev_remove(dev); | |
1425 | pci_disable_msix(pdev); | |
1426 | iounmap(dev->bar); | |
1427 | nvme_release_instance(dev); | |
091b6092 | 1428 | nvme_release_prp_pools(dev); |
0ee5a7d7 | 1429 | pci_disable_device(pdev); |
574e8b95 | 1430 | pci_release_regions(pdev); |
b60503ba MW |
1431 | kfree(dev->queues); |
1432 | kfree(dev->entry); | |
1433 | kfree(dev); | |
1434 | } | |
1435 | ||
1436 | /* These functions are yet to be implemented */ | |
1437 | #define nvme_error_detected NULL | |
1438 | #define nvme_dump_registers NULL | |
1439 | #define nvme_link_reset NULL | |
1440 | #define nvme_slot_reset NULL | |
1441 | #define nvme_error_resume NULL | |
1442 | #define nvme_suspend NULL | |
1443 | #define nvme_resume NULL | |
1444 | ||
1445 | static struct pci_error_handlers nvme_err_handler = { | |
1446 | .error_detected = nvme_error_detected, | |
1447 | .mmio_enabled = nvme_dump_registers, | |
1448 | .link_reset = nvme_link_reset, | |
1449 | .slot_reset = nvme_slot_reset, | |
1450 | .resume = nvme_error_resume, | |
1451 | }; | |
1452 | ||
1453 | /* Move to pci_ids.h later */ | |
1454 | #define PCI_CLASS_STORAGE_EXPRESS 0x010802 | |
1455 | ||
1456 | static DEFINE_PCI_DEVICE_TABLE(nvme_id_table) = { | |
1457 | { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, | |
1458 | { 0, } | |
1459 | }; | |
1460 | MODULE_DEVICE_TABLE(pci, nvme_id_table); | |
1461 | ||
1462 | static struct pci_driver nvme_driver = { | |
1463 | .name = "nvme", | |
1464 | .id_table = nvme_id_table, | |
1465 | .probe = nvme_probe, | |
1466 | .remove = __devexit_p(nvme_remove), | |
1467 | .suspend = nvme_suspend, | |
1468 | .resume = nvme_resume, | |
1469 | .err_handler = &nvme_err_handler, | |
1470 | }; | |
1471 | ||
1472 | static int __init nvme_init(void) | |
1473 | { | |
1474 | int result; | |
1475 | ||
1476 | nvme_major = register_blkdev(nvme_major, "nvme"); | |
1477 | if (nvme_major <= 0) | |
1478 | return -EBUSY; | |
1479 | ||
1480 | result = pci_register_driver(&nvme_driver); | |
1481 | if (!result) | |
1482 | return 0; | |
1483 | ||
1484 | unregister_blkdev(nvme_major, "nvme"); | |
1485 | return result; | |
1486 | } | |
1487 | ||
1488 | static void __exit nvme_exit(void) | |
1489 | { | |
1490 | pci_unregister_driver(&nvme_driver); | |
1491 | unregister_blkdev(nvme_major, "nvme"); | |
1492 | } | |
1493 | ||
1494 | MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); | |
1495 | MODULE_LICENSE("GPL"); | |
db5d0c19 | 1496 | MODULE_VERSION("0.2"); |
b60503ba MW |
1497 | module_init(nvme_init); |
1498 | module_exit(nvme_exit); |