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b60503ba MW |
1 | /* |
2 | * NVM Express device driver | |
6eb0d698 | 3 | * Copyright (c) 2011-2014, Intel Corporation. |
b60503ba MW |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
b60503ba MW |
13 | */ |
14 | ||
8de05535 | 15 | #include <linux/bitops.h> |
b60503ba | 16 | #include <linux/blkdev.h> |
a4aea562 | 17 | #include <linux/blk-mq.h> |
42f61420 | 18 | #include <linux/cpu.h> |
fd63e9ce | 19 | #include <linux/delay.h> |
b60503ba MW |
20 | #include <linux/errno.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/genhd.h> | |
4cc09e2d | 23 | #include <linux/hdreg.h> |
5aff9382 | 24 | #include <linux/idr.h> |
b60503ba MW |
25 | #include <linux/init.h> |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/kdev_t.h> | |
1fa6aead | 29 | #include <linux/kthread.h> |
b60503ba MW |
30 | #include <linux/kernel.h> |
31 | #include <linux/mm.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/moduleparam.h> | |
77bf25ea | 34 | #include <linux/mutex.h> |
b60503ba | 35 | #include <linux/pci.h> |
be7b6275 | 36 | #include <linux/poison.h> |
c3bfe717 | 37 | #include <linux/ptrace.h> |
b60503ba MW |
38 | #include <linux/sched.h> |
39 | #include <linux/slab.h> | |
e1e5e564 | 40 | #include <linux/t10-pi.h> |
b60503ba | 41 | #include <linux/types.h> |
2f8e2c87 | 42 | #include <linux/io-64-nonatomic-lo-hi.h> |
1d277a63 | 43 | #include <asm/unaligned.h> |
797a796a | 44 | |
f11bb3e2 CH |
45 | #include "nvme.h" |
46 | ||
9d43cf64 | 47 | #define NVME_Q_DEPTH 1024 |
d31af0a3 | 48 | #define NVME_AQ_DEPTH 256 |
b60503ba MW |
49 | #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) |
50 | #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) | |
9d43cf64 | 51 | |
21d34711 | 52 | unsigned char admin_timeout = 60; |
9d43cf64 KB |
53 | module_param(admin_timeout, byte, 0644); |
54 | MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); | |
b60503ba | 55 | |
bd67608a MW |
56 | unsigned char nvme_io_timeout = 30; |
57 | module_param_named(io_timeout, nvme_io_timeout, byte, 0644); | |
b355084a | 58 | MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); |
b60503ba | 59 | |
5fd4ce1b | 60 | unsigned char shutdown_timeout = 5; |
2484f407 DM |
61 | module_param(shutdown_timeout, byte, 0644); |
62 | MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); | |
63 | ||
58ffacb5 MW |
64 | static int use_threaded_interrupts; |
65 | module_param(use_threaded_interrupts, int, 0); | |
66 | ||
8ffaadf7 JD |
67 | static bool use_cmb_sqes = true; |
68 | module_param(use_cmb_sqes, bool, 0644); | |
69 | MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); | |
70 | ||
1fa6aead MW |
71 | static LIST_HEAD(dev_list); |
72 | static struct task_struct *nvme_thread; | |
9a6b9458 | 73 | static struct workqueue_struct *nvme_workq; |
b9afca3e | 74 | static wait_queue_head_t nvme_kthread_wait; |
1fa6aead | 75 | |
1c63dc66 CH |
76 | struct nvme_dev; |
77 | struct nvme_queue; | |
d4f6c3ab | 78 | struct nvme_iod; |
1c63dc66 | 79 | |
4cc06521 | 80 | static int nvme_reset(struct nvme_dev *dev); |
a0fa9647 | 81 | static void nvme_process_cq(struct nvme_queue *nvmeq); |
d4f6c3ab | 82 | static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod); |
5c8809e6 | 83 | static void nvme_remove_dead_ctrl(struct nvme_dev *dev); |
e1569a16 | 84 | static void nvme_dev_shutdown(struct nvme_dev *dev); |
d4b4ff8e | 85 | |
4d115420 KB |
86 | struct async_cmd_info { |
87 | struct kthread_work work; | |
88 | struct kthread_worker *worker; | |
a4aea562 | 89 | struct request *req; |
4d115420 KB |
90 | u32 result; |
91 | int status; | |
92 | void *ctx; | |
93 | }; | |
1fa6aead | 94 | |
1c63dc66 CH |
95 | /* |
96 | * Represents an NVM Express device. Each nvme_dev is a PCI function. | |
97 | */ | |
98 | struct nvme_dev { | |
99 | struct list_head node; | |
100 | struct nvme_queue **queues; | |
101 | struct blk_mq_tag_set tagset; | |
102 | struct blk_mq_tag_set admin_tagset; | |
103 | u32 __iomem *dbs; | |
104 | struct device *dev; | |
105 | struct dma_pool *prp_page_pool; | |
106 | struct dma_pool *prp_small_pool; | |
107 | unsigned queue_count; | |
108 | unsigned online_queues; | |
109 | unsigned max_qid; | |
110 | int q_depth; | |
111 | u32 db_stride; | |
1c63dc66 CH |
112 | struct msix_entry *entry; |
113 | void __iomem *bar; | |
1c63dc66 | 114 | struct work_struct reset_work; |
1c63dc66 | 115 | struct work_struct scan_work; |
5c8809e6 | 116 | struct work_struct remove_work; |
77bf25ea | 117 | struct mutex shutdown_lock; |
1c63dc66 | 118 | bool subsystem; |
1c63dc66 CH |
119 | void __iomem *cmb; |
120 | dma_addr_t cmb_dma_addr; | |
121 | u64 cmb_size; | |
122 | u32 cmbsz; | |
fd634f41 CH |
123 | unsigned long flags; |
124 | #define NVME_CTRL_RESETTING 0 | |
1c63dc66 CH |
125 | |
126 | struct nvme_ctrl ctrl; | |
127 | }; | |
128 | ||
129 | static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) | |
130 | { | |
131 | return container_of(ctrl, struct nvme_dev, ctrl); | |
132 | } | |
133 | ||
b60503ba MW |
134 | /* |
135 | * An NVM Express queue. Each device has at least two (one for admin | |
136 | * commands and one for I/O commands). | |
137 | */ | |
138 | struct nvme_queue { | |
139 | struct device *q_dmadev; | |
091b6092 | 140 | struct nvme_dev *dev; |
3193f07b | 141 | char irqname[24]; /* nvme4294967295-65535\0 */ |
b60503ba MW |
142 | spinlock_t q_lock; |
143 | struct nvme_command *sq_cmds; | |
8ffaadf7 | 144 | struct nvme_command __iomem *sq_cmds_io; |
b60503ba | 145 | volatile struct nvme_completion *cqes; |
42483228 | 146 | struct blk_mq_tags **tags; |
b60503ba MW |
147 | dma_addr_t sq_dma_addr; |
148 | dma_addr_t cq_dma_addr; | |
b60503ba MW |
149 | u32 __iomem *q_db; |
150 | u16 q_depth; | |
6222d172 | 151 | s16 cq_vector; |
b60503ba MW |
152 | u16 sq_head; |
153 | u16 sq_tail; | |
154 | u16 cq_head; | |
c30341dc | 155 | u16 qid; |
e9539f47 MW |
156 | u8 cq_phase; |
157 | u8 cqe_seen; | |
4d115420 | 158 | struct async_cmd_info cmdinfo; |
b60503ba MW |
159 | }; |
160 | ||
71bd150c CH |
161 | /* |
162 | * The nvme_iod describes the data in an I/O, including the list of PRP | |
163 | * entries. You can't see it in this data structure because C doesn't let | |
164 | * me express that. Use nvme_alloc_iod to ensure there's enough space | |
165 | * allocated to store the PRP list. | |
166 | */ | |
167 | struct nvme_iod { | |
168 | unsigned long private; /* For the use of the submitter of the I/O */ | |
169 | int npages; /* In the PRP list. 0 means small pool in use */ | |
170 | int offset; /* Of PRP list */ | |
171 | int nents; /* Used in scatterlist */ | |
172 | int length; /* Of data, in bytes */ | |
173 | dma_addr_t first_dma; | |
174 | struct scatterlist meta_sg[1]; /* metadata requires single contiguous buffer */ | |
175 | struct scatterlist sg[0]; | |
176 | }; | |
177 | ||
b60503ba MW |
178 | /* |
179 | * Check we didin't inadvertently grow the command struct | |
180 | */ | |
181 | static inline void _nvme_check_size(void) | |
182 | { | |
183 | BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); | |
184 | BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); | |
185 | BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); | |
186 | BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); | |
187 | BUILD_BUG_ON(sizeof(struct nvme_features) != 64); | |
f8ebf840 | 188 | BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); |
c30341dc | 189 | BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); |
b60503ba MW |
190 | BUILD_BUG_ON(sizeof(struct nvme_command) != 64); |
191 | BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); | |
192 | BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); | |
193 | BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); | |
6ecec745 | 194 | BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); |
b60503ba MW |
195 | } |
196 | ||
edd10d33 | 197 | typedef void (*nvme_completion_fn)(struct nvme_queue *, void *, |
c2f5b650 MW |
198 | struct nvme_completion *); |
199 | ||
e85248e5 | 200 | struct nvme_cmd_info { |
c2f5b650 MW |
201 | nvme_completion_fn fn; |
202 | void *ctx; | |
c30341dc | 203 | int aborted; |
a4aea562 | 204 | struct nvme_queue *nvmeq; |
ac3dd5bd | 205 | struct nvme_iod iod[0]; |
e85248e5 MW |
206 | }; |
207 | ||
ac3dd5bd JA |
208 | /* |
209 | * Max size of iod being embedded in the request payload | |
210 | */ | |
211 | #define NVME_INT_PAGES 2 | |
5fd4ce1b | 212 | #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) |
fda631ff | 213 | #define NVME_INT_MASK 0x01 |
ac3dd5bd JA |
214 | |
215 | /* | |
216 | * Will slightly overestimate the number of pages needed. This is OK | |
217 | * as it only leads to a small amount of wasted memory for the lifetime of | |
218 | * the I/O. | |
219 | */ | |
220 | static int nvme_npages(unsigned size, struct nvme_dev *dev) | |
221 | { | |
5fd4ce1b CH |
222 | unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size, |
223 | dev->ctrl.page_size); | |
ac3dd5bd JA |
224 | return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); |
225 | } | |
226 | ||
227 | static unsigned int nvme_cmd_size(struct nvme_dev *dev) | |
228 | { | |
229 | unsigned int ret = sizeof(struct nvme_cmd_info); | |
230 | ||
231 | ret += sizeof(struct nvme_iod); | |
232 | ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev), dev); | |
233 | ret += sizeof(struct scatterlist) * NVME_INT_PAGES; | |
234 | ||
235 | return ret; | |
236 | } | |
237 | ||
a4aea562 MB |
238 | static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
239 | unsigned int hctx_idx) | |
e85248e5 | 240 | { |
a4aea562 MB |
241 | struct nvme_dev *dev = data; |
242 | struct nvme_queue *nvmeq = dev->queues[0]; | |
243 | ||
42483228 KB |
244 | WARN_ON(hctx_idx != 0); |
245 | WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); | |
246 | WARN_ON(nvmeq->tags); | |
247 | ||
a4aea562 | 248 | hctx->driver_data = nvmeq; |
42483228 | 249 | nvmeq->tags = &dev->admin_tagset.tags[0]; |
a4aea562 | 250 | return 0; |
e85248e5 MW |
251 | } |
252 | ||
4af0e21c KB |
253 | static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
254 | { | |
255 | struct nvme_queue *nvmeq = hctx->driver_data; | |
256 | ||
257 | nvmeq->tags = NULL; | |
258 | } | |
259 | ||
a4aea562 MB |
260 | static int nvme_admin_init_request(void *data, struct request *req, |
261 | unsigned int hctx_idx, unsigned int rq_idx, | |
262 | unsigned int numa_node) | |
22404274 | 263 | { |
a4aea562 MB |
264 | struct nvme_dev *dev = data; |
265 | struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); | |
266 | struct nvme_queue *nvmeq = dev->queues[0]; | |
267 | ||
268 | BUG_ON(!nvmeq); | |
269 | cmd->nvmeq = nvmeq; | |
270 | return 0; | |
22404274 KB |
271 | } |
272 | ||
a4aea562 MB |
273 | static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
274 | unsigned int hctx_idx) | |
b60503ba | 275 | { |
a4aea562 | 276 | struct nvme_dev *dev = data; |
42483228 | 277 | struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; |
a4aea562 | 278 | |
42483228 KB |
279 | if (!nvmeq->tags) |
280 | nvmeq->tags = &dev->tagset.tags[hctx_idx]; | |
b60503ba | 281 | |
42483228 | 282 | WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); |
a4aea562 MB |
283 | hctx->driver_data = nvmeq; |
284 | return 0; | |
b60503ba MW |
285 | } |
286 | ||
a4aea562 MB |
287 | static int nvme_init_request(void *data, struct request *req, |
288 | unsigned int hctx_idx, unsigned int rq_idx, | |
289 | unsigned int numa_node) | |
b60503ba | 290 | { |
a4aea562 MB |
291 | struct nvme_dev *dev = data; |
292 | struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); | |
293 | struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; | |
294 | ||
295 | BUG_ON(!nvmeq); | |
296 | cmd->nvmeq = nvmeq; | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static void nvme_set_info(struct nvme_cmd_info *cmd, void *ctx, | |
301 | nvme_completion_fn handler) | |
302 | { | |
303 | cmd->fn = handler; | |
304 | cmd->ctx = ctx; | |
305 | cmd->aborted = 0; | |
c917dfe5 | 306 | blk_mq_start_request(blk_mq_rq_from_pdu(cmd)); |
b60503ba MW |
307 | } |
308 | ||
ac3dd5bd JA |
309 | static void *iod_get_private(struct nvme_iod *iod) |
310 | { | |
311 | return (void *) (iod->private & ~0x1UL); | |
312 | } | |
313 | ||
314 | /* | |
315 | * If bit 0 is set, the iod is embedded in the request payload. | |
316 | */ | |
317 | static bool iod_should_kfree(struct nvme_iod *iod) | |
318 | { | |
fda631ff | 319 | return (iod->private & NVME_INT_MASK) == 0; |
ac3dd5bd JA |
320 | } |
321 | ||
c2f5b650 MW |
322 | /* Special values must be less than 0x1000 */ |
323 | #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA) | |
d2d87034 MW |
324 | #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) |
325 | #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) | |
326 | #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) | |
be7b6275 | 327 | |
edd10d33 | 328 | static void special_completion(struct nvme_queue *nvmeq, void *ctx, |
c2f5b650 MW |
329 | struct nvme_completion *cqe) |
330 | { | |
331 | if (ctx == CMD_CTX_CANCELLED) | |
332 | return; | |
c2f5b650 | 333 | if (ctx == CMD_CTX_COMPLETED) { |
edd10d33 | 334 | dev_warn(nvmeq->q_dmadev, |
c2f5b650 MW |
335 | "completed id %d twice on queue %d\n", |
336 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
337 | return; | |
338 | } | |
339 | if (ctx == CMD_CTX_INVALID) { | |
edd10d33 | 340 | dev_warn(nvmeq->q_dmadev, |
c2f5b650 MW |
341 | "invalid id %d completed on queue %d\n", |
342 | cqe->command_id, le16_to_cpup(&cqe->sq_id)); | |
343 | return; | |
344 | } | |
edd10d33 | 345 | dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n", ctx); |
c2f5b650 MW |
346 | } |
347 | ||
a4aea562 | 348 | static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn) |
b60503ba | 349 | { |
c2f5b650 | 350 | void *ctx; |
b60503ba | 351 | |
859361a2 | 352 | if (fn) |
a4aea562 MB |
353 | *fn = cmd->fn; |
354 | ctx = cmd->ctx; | |
355 | cmd->fn = special_completion; | |
356 | cmd->ctx = CMD_CTX_CANCELLED; | |
c2f5b650 | 357 | return ctx; |
b60503ba MW |
358 | } |
359 | ||
a4aea562 MB |
360 | static void async_req_completion(struct nvme_queue *nvmeq, void *ctx, |
361 | struct nvme_completion *cqe) | |
3c0cf138 | 362 | { |
a4aea562 MB |
363 | u32 result = le32_to_cpup(&cqe->result); |
364 | u16 status = le16_to_cpup(&cqe->status) >> 1; | |
365 | ||
366 | if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) | |
1c63dc66 | 367 | ++nvmeq->dev->ctrl.event_limit; |
a5768aa8 KB |
368 | if (status != NVME_SC_SUCCESS) |
369 | return; | |
370 | ||
371 | switch (result & 0xff07) { | |
372 | case NVME_AER_NOTICE_NS_CHANGED: | |
373 | dev_info(nvmeq->q_dmadev, "rescanning\n"); | |
374 | schedule_work(&nvmeq->dev->scan_work); | |
375 | default: | |
376 | dev_warn(nvmeq->q_dmadev, "async event result %08x\n", result); | |
377 | } | |
b60503ba MW |
378 | } |
379 | ||
a4aea562 MB |
380 | static void abort_completion(struct nvme_queue *nvmeq, void *ctx, |
381 | struct nvme_completion *cqe) | |
5a92e700 | 382 | { |
a4aea562 MB |
383 | struct request *req = ctx; |
384 | ||
385 | u16 status = le16_to_cpup(&cqe->status) >> 1; | |
386 | u32 result = le32_to_cpup(&cqe->result); | |
a51afb54 | 387 | |
42483228 | 388 | blk_mq_free_request(req); |
a51afb54 | 389 | |
a4aea562 | 390 | dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result); |
6bf25d16 | 391 | atomic_inc(&nvmeq->dev->ctrl.abort_limit); |
5a92e700 KB |
392 | } |
393 | ||
a4aea562 MB |
394 | static void async_completion(struct nvme_queue *nvmeq, void *ctx, |
395 | struct nvme_completion *cqe) | |
b60503ba | 396 | { |
a4aea562 MB |
397 | struct async_cmd_info *cmdinfo = ctx; |
398 | cmdinfo->result = le32_to_cpup(&cqe->result); | |
399 | cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; | |
400 | queue_kthread_work(cmdinfo->worker, &cmdinfo->work); | |
42483228 | 401 | blk_mq_free_request(cmdinfo->req); |
b60503ba MW |
402 | } |
403 | ||
a4aea562 MB |
404 | static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq, |
405 | unsigned int tag) | |
b60503ba | 406 | { |
42483228 | 407 | struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag); |
a51afb54 | 408 | |
a4aea562 | 409 | return blk_mq_rq_to_pdu(req); |
4f5099af KB |
410 | } |
411 | ||
a4aea562 MB |
412 | /* |
413 | * Called with local interrupts disabled and the q_lock held. May not sleep. | |
414 | */ | |
415 | static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag, | |
416 | nvme_completion_fn *fn) | |
4f5099af | 417 | { |
a4aea562 MB |
418 | struct nvme_cmd_info *cmd = get_cmd_from_tag(nvmeq, tag); |
419 | void *ctx; | |
420 | if (tag >= nvmeq->q_depth) { | |
421 | *fn = special_completion; | |
422 | return CMD_CTX_INVALID; | |
423 | } | |
424 | if (fn) | |
425 | *fn = cmd->fn; | |
426 | ctx = cmd->ctx; | |
427 | cmd->fn = special_completion; | |
428 | cmd->ctx = CMD_CTX_COMPLETED; | |
429 | return ctx; | |
b60503ba MW |
430 | } |
431 | ||
432 | /** | |
714a7a22 | 433 | * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell |
b60503ba MW |
434 | * @nvmeq: The queue to use |
435 | * @cmd: The command to send | |
436 | * | |
437 | * Safe to use from interrupt context | |
438 | */ | |
e3f879bf SB |
439 | static void __nvme_submit_cmd(struct nvme_queue *nvmeq, |
440 | struct nvme_command *cmd) | |
b60503ba | 441 | { |
a4aea562 MB |
442 | u16 tail = nvmeq->sq_tail; |
443 | ||
8ffaadf7 JD |
444 | if (nvmeq->sq_cmds_io) |
445 | memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); | |
446 | else | |
447 | memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); | |
448 | ||
b60503ba MW |
449 | if (++tail == nvmeq->q_depth) |
450 | tail = 0; | |
7547881d | 451 | writel(tail, nvmeq->q_db); |
b60503ba | 452 | nvmeq->sq_tail = tail; |
b60503ba MW |
453 | } |
454 | ||
e3f879bf | 455 | static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) |
a4aea562 MB |
456 | { |
457 | unsigned long flags; | |
a4aea562 | 458 | spin_lock_irqsave(&nvmeq->q_lock, flags); |
e3f879bf | 459 | __nvme_submit_cmd(nvmeq, cmd); |
a4aea562 | 460 | spin_unlock_irqrestore(&nvmeq->q_lock, flags); |
a4aea562 MB |
461 | } |
462 | ||
eca18b23 | 463 | static __le64 **iod_list(struct nvme_iod *iod) |
e025344c | 464 | { |
eca18b23 | 465 | return ((void *)iod) + iod->offset; |
e025344c SMM |
466 | } |
467 | ||
ac3dd5bd JA |
468 | static inline void iod_init(struct nvme_iod *iod, unsigned nbytes, |
469 | unsigned nseg, unsigned long private) | |
eca18b23 | 470 | { |
ac3dd5bd JA |
471 | iod->private = private; |
472 | iod->offset = offsetof(struct nvme_iod, sg[nseg]); | |
473 | iod->npages = -1; | |
474 | iod->length = nbytes; | |
475 | iod->nents = 0; | |
eca18b23 | 476 | } |
b60503ba | 477 | |
eca18b23 | 478 | static struct nvme_iod * |
ac3dd5bd JA |
479 | __nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev, |
480 | unsigned long priv, gfp_t gfp) | |
b60503ba | 481 | { |
eca18b23 | 482 | struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) + |
ac3dd5bd | 483 | sizeof(__le64 *) * nvme_npages(bytes, dev) + |
eca18b23 MW |
484 | sizeof(struct scatterlist) * nseg, gfp); |
485 | ||
ac3dd5bd JA |
486 | if (iod) |
487 | iod_init(iod, bytes, nseg, priv); | |
eca18b23 MW |
488 | |
489 | return iod; | |
b60503ba MW |
490 | } |
491 | ||
ac3dd5bd JA |
492 | static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev, |
493 | gfp_t gfp) | |
494 | { | |
495 | unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) : | |
496 | sizeof(struct nvme_dsm_range); | |
ac3dd5bd JA |
497 | struct nvme_iod *iod; |
498 | ||
499 | if (rq->nr_phys_segments <= NVME_INT_PAGES && | |
500 | size <= NVME_INT_BYTES(dev)) { | |
501 | struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq); | |
502 | ||
503 | iod = cmd->iod; | |
ac3dd5bd | 504 | iod_init(iod, size, rq->nr_phys_segments, |
fda631ff | 505 | (unsigned long) rq | NVME_INT_MASK); |
ac3dd5bd JA |
506 | return iod; |
507 | } | |
508 | ||
509 | return __nvme_alloc_iod(rq->nr_phys_segments, size, dev, | |
510 | (unsigned long) rq, gfp); | |
511 | } | |
512 | ||
d29ec824 | 513 | static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) |
b60503ba | 514 | { |
5fd4ce1b | 515 | const int last_prp = dev->ctrl.page_size / 8 - 1; |
eca18b23 MW |
516 | int i; |
517 | __le64 **list = iod_list(iod); | |
518 | dma_addr_t prp_dma = iod->first_dma; | |
519 | ||
520 | if (iod->npages == 0) | |
521 | dma_pool_free(dev->prp_small_pool, list[0], prp_dma); | |
522 | for (i = 0; i < iod->npages; i++) { | |
523 | __le64 *prp_list = list[i]; | |
524 | dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); | |
525 | dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); | |
526 | prp_dma = next_prp_dma; | |
527 | } | |
ac3dd5bd JA |
528 | |
529 | if (iod_should_kfree(iod)) | |
530 | kfree(iod); | |
b60503ba MW |
531 | } |
532 | ||
52b68d7e | 533 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
e1e5e564 KB |
534 | static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) |
535 | { | |
536 | if (be32_to_cpu(pi->ref_tag) == v) | |
537 | pi->ref_tag = cpu_to_be32(p); | |
538 | } | |
539 | ||
540 | static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) | |
541 | { | |
542 | if (be32_to_cpu(pi->ref_tag) == p) | |
543 | pi->ref_tag = cpu_to_be32(v); | |
544 | } | |
545 | ||
546 | /** | |
547 | * nvme_dif_remap - remaps ref tags to bip seed and physical lba | |
548 | * | |
549 | * The virtual start sector is the one that was originally submitted by the | |
550 | * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical | |
551 | * start sector may be different. Remap protection information to match the | |
552 | * physical LBA on writes, and back to the original seed on reads. | |
553 | * | |
554 | * Type 0 and 3 do not have a ref tag, so no remapping required. | |
555 | */ | |
556 | static void nvme_dif_remap(struct request *req, | |
557 | void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) | |
558 | { | |
559 | struct nvme_ns *ns = req->rq_disk->private_data; | |
560 | struct bio_integrity_payload *bip; | |
561 | struct t10_pi_tuple *pi; | |
562 | void *p, *pmap; | |
563 | u32 i, nlb, ts, phys, virt; | |
564 | ||
565 | if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) | |
566 | return; | |
567 | ||
568 | bip = bio_integrity(req->bio); | |
569 | if (!bip) | |
570 | return; | |
571 | ||
572 | pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; | |
e1e5e564 KB |
573 | |
574 | p = pmap; | |
575 | virt = bip_get_seed(bip); | |
576 | phys = nvme_block_nr(ns, blk_rq_pos(req)); | |
577 | nlb = (blk_rq_bytes(req) >> ns->lba_shift); | |
ac6fc48c | 578 | ts = ns->disk->queue->integrity.tuple_size; |
e1e5e564 KB |
579 | |
580 | for (i = 0; i < nlb; i++, virt++, phys++) { | |
581 | pi = (struct t10_pi_tuple *)p; | |
582 | dif_swap(phys, virt, pi); | |
583 | p += ts; | |
584 | } | |
585 | kunmap_atomic(pmap); | |
586 | } | |
52b68d7e KB |
587 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
588 | static void nvme_dif_remap(struct request *req, | |
589 | void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) | |
590 | { | |
591 | } | |
592 | static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) | |
593 | { | |
594 | } | |
595 | static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) | |
596 | { | |
597 | } | |
52b68d7e KB |
598 | #endif |
599 | ||
a4aea562 | 600 | static void req_completion(struct nvme_queue *nvmeq, void *ctx, |
b60503ba MW |
601 | struct nvme_completion *cqe) |
602 | { | |
eca18b23 | 603 | struct nvme_iod *iod = ctx; |
ac3dd5bd | 604 | struct request *req = iod_get_private(iod); |
a4aea562 | 605 | struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); |
b60503ba | 606 | u16 status = le16_to_cpup(&cqe->status) >> 1; |
81c04b94 | 607 | int error = 0; |
b60503ba | 608 | |
edd10d33 | 609 | if (unlikely(status)) { |
a4aea562 MB |
610 | if (!(status & NVME_SC_DNR || blk_noretry_request(req)) |
611 | && (jiffies - req->start_time) < req->timeout) { | |
c9d3bf88 KB |
612 | unsigned long flags; |
613 | ||
d4f6c3ab CH |
614 | nvme_unmap_data(nvmeq->dev, iod); |
615 | ||
a4aea562 | 616 | blk_mq_requeue_request(req); |
c9d3bf88 KB |
617 | spin_lock_irqsave(req->q->queue_lock, flags); |
618 | if (!blk_queue_stopped(req->q)) | |
619 | blk_mq_kick_requeue_list(req->q); | |
620 | spin_unlock_irqrestore(req->q->queue_lock, flags); | |
d4f6c3ab | 621 | return; |
edd10d33 | 622 | } |
f4829a9b | 623 | |
d29ec824 | 624 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) { |
17188bb4 | 625 | if (cmd_rq->ctx == CMD_CTX_CANCELLED) |
297465c8 | 626 | error = NVME_SC_CANCELLED; |
81c04b94 CH |
627 | else |
628 | error = status; | |
d29ec824 | 629 | } else { |
81c04b94 | 630 | error = nvme_error_status(status); |
d29ec824 | 631 | } |
f4829a9b CH |
632 | } |
633 | ||
a0a931d6 KB |
634 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) { |
635 | u32 result = le32_to_cpup(&cqe->result); | |
636 | req->special = (void *)(uintptr_t)result; | |
637 | } | |
a4aea562 MB |
638 | |
639 | if (cmd_rq->aborted) | |
e75ec752 | 640 | dev_warn(nvmeq->dev->dev, |
a4aea562 | 641 | "completing aborted command with status:%04x\n", |
81c04b94 | 642 | error); |
a4aea562 | 643 | |
d4f6c3ab CH |
644 | nvme_unmap_data(nvmeq->dev, iod); |
645 | blk_mq_complete_request(req, error); | |
b60503ba MW |
646 | } |
647 | ||
69d2b571 CH |
648 | static bool nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, |
649 | int total_len) | |
ff22b54f | 650 | { |
99802a7a | 651 | struct dma_pool *pool; |
eca18b23 MW |
652 | int length = total_len; |
653 | struct scatterlist *sg = iod->sg; | |
ff22b54f MW |
654 | int dma_len = sg_dma_len(sg); |
655 | u64 dma_addr = sg_dma_address(sg); | |
5fd4ce1b | 656 | u32 page_size = dev->ctrl.page_size; |
f137e0f1 | 657 | int offset = dma_addr & (page_size - 1); |
e025344c | 658 | __le64 *prp_list; |
eca18b23 | 659 | __le64 **list = iod_list(iod); |
e025344c | 660 | dma_addr_t prp_dma; |
eca18b23 | 661 | int nprps, i; |
ff22b54f | 662 | |
1d090624 | 663 | length -= (page_size - offset); |
ff22b54f | 664 | if (length <= 0) |
69d2b571 | 665 | return true; |
ff22b54f | 666 | |
1d090624 | 667 | dma_len -= (page_size - offset); |
ff22b54f | 668 | if (dma_len) { |
1d090624 | 669 | dma_addr += (page_size - offset); |
ff22b54f MW |
670 | } else { |
671 | sg = sg_next(sg); | |
672 | dma_addr = sg_dma_address(sg); | |
673 | dma_len = sg_dma_len(sg); | |
674 | } | |
675 | ||
1d090624 | 676 | if (length <= page_size) { |
edd10d33 | 677 | iod->first_dma = dma_addr; |
69d2b571 | 678 | return true; |
e025344c SMM |
679 | } |
680 | ||
1d090624 | 681 | nprps = DIV_ROUND_UP(length, page_size); |
99802a7a MW |
682 | if (nprps <= (256 / 8)) { |
683 | pool = dev->prp_small_pool; | |
eca18b23 | 684 | iod->npages = 0; |
99802a7a MW |
685 | } else { |
686 | pool = dev->prp_page_pool; | |
eca18b23 | 687 | iod->npages = 1; |
99802a7a MW |
688 | } |
689 | ||
69d2b571 | 690 | prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); |
b77954cb | 691 | if (!prp_list) { |
edd10d33 | 692 | iod->first_dma = dma_addr; |
eca18b23 | 693 | iod->npages = -1; |
69d2b571 | 694 | return false; |
b77954cb | 695 | } |
eca18b23 MW |
696 | list[0] = prp_list; |
697 | iod->first_dma = prp_dma; | |
e025344c SMM |
698 | i = 0; |
699 | for (;;) { | |
1d090624 | 700 | if (i == page_size >> 3) { |
e025344c | 701 | __le64 *old_prp_list = prp_list; |
69d2b571 | 702 | prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); |
eca18b23 | 703 | if (!prp_list) |
69d2b571 | 704 | return false; |
eca18b23 | 705 | list[iod->npages++] = prp_list; |
7523d834 MW |
706 | prp_list[0] = old_prp_list[i - 1]; |
707 | old_prp_list[i - 1] = cpu_to_le64(prp_dma); | |
708 | i = 1; | |
e025344c SMM |
709 | } |
710 | prp_list[i++] = cpu_to_le64(dma_addr); | |
1d090624 KB |
711 | dma_len -= page_size; |
712 | dma_addr += page_size; | |
713 | length -= page_size; | |
e025344c SMM |
714 | if (length <= 0) |
715 | break; | |
716 | if (dma_len > 0) | |
717 | continue; | |
718 | BUG_ON(dma_len < 0); | |
719 | sg = sg_next(sg); | |
720 | dma_addr = sg_dma_address(sg); | |
721 | dma_len = sg_dma_len(sg); | |
ff22b54f MW |
722 | } |
723 | ||
69d2b571 | 724 | return true; |
ff22b54f MW |
725 | } |
726 | ||
ba1ca37e CH |
727 | static int nvme_map_data(struct nvme_dev *dev, struct nvme_iod *iod, |
728 | struct nvme_command *cmnd) | |
d29ec824 | 729 | { |
ba1ca37e CH |
730 | struct request *req = iod_get_private(iod); |
731 | struct request_queue *q = req->q; | |
732 | enum dma_data_direction dma_dir = rq_data_dir(req) ? | |
733 | DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
734 | int ret = BLK_MQ_RQ_QUEUE_ERROR; | |
735 | ||
736 | sg_init_table(iod->sg, req->nr_phys_segments); | |
737 | iod->nents = blk_rq_map_sg(q, req, iod->sg); | |
738 | if (!iod->nents) | |
739 | goto out; | |
740 | ||
741 | ret = BLK_MQ_RQ_QUEUE_BUSY; | |
742 | if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir)) | |
743 | goto out; | |
744 | ||
745 | if (!nvme_setup_prps(dev, iod, blk_rq_bytes(req))) | |
746 | goto out_unmap; | |
747 | ||
748 | ret = BLK_MQ_RQ_QUEUE_ERROR; | |
749 | if (blk_integrity_rq(req)) { | |
750 | if (blk_rq_count_integrity_sg(q, req->bio) != 1) | |
751 | goto out_unmap; | |
752 | ||
753 | sg_init_table(iod->meta_sg, 1); | |
754 | if (blk_rq_map_integrity_sg(q, req->bio, iod->meta_sg) != 1) | |
755 | goto out_unmap; | |
d29ec824 | 756 | |
ba1ca37e CH |
757 | if (rq_data_dir(req)) |
758 | nvme_dif_remap(req, nvme_dif_prep); | |
759 | ||
760 | if (!dma_map_sg(dev->dev, iod->meta_sg, 1, dma_dir)) | |
761 | goto out_unmap; | |
d29ec824 CH |
762 | } |
763 | ||
ba1ca37e CH |
764 | cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); |
765 | cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); | |
766 | if (blk_integrity_rq(req)) | |
767 | cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg)); | |
768 | return BLK_MQ_RQ_QUEUE_OK; | |
769 | ||
770 | out_unmap: | |
771 | dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); | |
772 | out: | |
773 | return ret; | |
d29ec824 CH |
774 | } |
775 | ||
d4f6c3ab CH |
776 | static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod) |
777 | { | |
778 | struct request *req = iod_get_private(iod); | |
779 | enum dma_data_direction dma_dir = rq_data_dir(req) ? | |
780 | DMA_TO_DEVICE : DMA_FROM_DEVICE; | |
781 | ||
782 | if (iod->nents) { | |
783 | dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); | |
784 | if (blk_integrity_rq(req)) { | |
785 | if (!rq_data_dir(req)) | |
786 | nvme_dif_remap(req, nvme_dif_complete); | |
787 | dma_unmap_sg(dev->dev, iod->meta_sg, 1, dma_dir); | |
788 | } | |
789 | } | |
790 | ||
791 | nvme_free_iod(dev, iod); | |
792 | } | |
793 | ||
a4aea562 MB |
794 | /* |
795 | * We reuse the small pool to allocate the 16-byte range here as it is not | |
796 | * worth having a special pool for these or additional cases to handle freeing | |
797 | * the iod. | |
798 | */ | |
ba1ca37e CH |
799 | static int nvme_setup_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, |
800 | struct nvme_iod *iod, struct nvme_command *cmnd) | |
0e5e4f0e | 801 | { |
ba1ca37e CH |
802 | struct request *req = iod_get_private(iod); |
803 | struct nvme_dsm_range *range; | |
804 | ||
805 | range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC, | |
806 | &iod->first_dma); | |
807 | if (!range) | |
808 | return BLK_MQ_RQ_QUEUE_BUSY; | |
809 | iod_list(iod)[0] = (__le64 *)range; | |
810 | iod->npages = 0; | |
0e5e4f0e | 811 | |
0e5e4f0e | 812 | range->cattr = cpu_to_le32(0); |
a4aea562 MB |
813 | range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift); |
814 | range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); | |
0e5e4f0e | 815 | |
ba1ca37e CH |
816 | memset(cmnd, 0, sizeof(*cmnd)); |
817 | cmnd->dsm.opcode = nvme_cmd_dsm; | |
818 | cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); | |
819 | cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma); | |
820 | cmnd->dsm.nr = 0; | |
821 | cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); | |
822 | return BLK_MQ_RQ_QUEUE_OK; | |
0e5e4f0e KB |
823 | } |
824 | ||
d29ec824 CH |
825 | /* |
826 | * NOTE: ns is NULL when called on the admin queue. | |
827 | */ | |
a4aea562 MB |
828 | static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, |
829 | const struct blk_mq_queue_data *bd) | |
edd10d33 | 830 | { |
a4aea562 MB |
831 | struct nvme_ns *ns = hctx->queue->queuedata; |
832 | struct nvme_queue *nvmeq = hctx->driver_data; | |
d29ec824 | 833 | struct nvme_dev *dev = nvmeq->dev; |
a4aea562 MB |
834 | struct request *req = bd->rq; |
835 | struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); | |
edd10d33 | 836 | struct nvme_iod *iod; |
ba1ca37e CH |
837 | struct nvme_command cmnd; |
838 | int ret = BLK_MQ_RQ_QUEUE_OK; | |
edd10d33 | 839 | |
e1e5e564 KB |
840 | /* |
841 | * If formated with metadata, require the block layer provide a buffer | |
842 | * unless this namespace is formated such that the metadata can be | |
843 | * stripped/generated by the controller with PRACT=1. | |
844 | */ | |
d29ec824 | 845 | if (ns && ns->ms && !blk_integrity_rq(req)) { |
71feb364 KB |
846 | if (!(ns->pi_type && ns->ms == 8) && |
847 | req->cmd_type != REQ_TYPE_DRV_PRIV) { | |
f4829a9b | 848 | blk_mq_complete_request(req, -EFAULT); |
e1e5e564 KB |
849 | return BLK_MQ_RQ_QUEUE_OK; |
850 | } | |
851 | } | |
852 | ||
d29ec824 | 853 | iod = nvme_alloc_iod(req, dev, GFP_ATOMIC); |
edd10d33 | 854 | if (!iod) |
fe54303e | 855 | return BLK_MQ_RQ_QUEUE_BUSY; |
a4aea562 | 856 | |
a4aea562 | 857 | if (req->cmd_flags & REQ_DISCARD) { |
ba1ca37e CH |
858 | ret = nvme_setup_discard(nvmeq, ns, iod, &cmnd); |
859 | } else { | |
860 | if (req->cmd_type == REQ_TYPE_DRV_PRIV) | |
861 | memcpy(&cmnd, req->cmd, sizeof(cmnd)); | |
862 | else if (req->cmd_flags & REQ_FLUSH) | |
863 | nvme_setup_flush(ns, &cmnd); | |
864 | else | |
865 | nvme_setup_rw(ns, req, &cmnd); | |
a4aea562 | 866 | |
ba1ca37e CH |
867 | if (req->nr_phys_segments) |
868 | ret = nvme_map_data(dev, iod, &cmnd); | |
edd10d33 | 869 | } |
1974b1ae | 870 | |
ba1ca37e CH |
871 | if (ret) |
872 | goto out; | |
873 | ||
874 | cmnd.common.command_id = req->tag; | |
9af8785a | 875 | nvme_set_info(cmd, iod, req_completion); |
a4aea562 | 876 | |
ba1ca37e CH |
877 | spin_lock_irq(&nvmeq->q_lock); |
878 | __nvme_submit_cmd(nvmeq, &cmnd); | |
a4aea562 MB |
879 | nvme_process_cq(nvmeq); |
880 | spin_unlock_irq(&nvmeq->q_lock); | |
881 | return BLK_MQ_RQ_QUEUE_OK; | |
ba1ca37e | 882 | out: |
d29ec824 | 883 | nvme_free_iod(dev, iod); |
ba1ca37e | 884 | return ret; |
b60503ba MW |
885 | } |
886 | ||
a0fa9647 | 887 | static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag) |
b60503ba | 888 | { |
82123460 | 889 | u16 head, phase; |
b60503ba | 890 | |
b60503ba | 891 | head = nvmeq->cq_head; |
82123460 | 892 | phase = nvmeq->cq_phase; |
b60503ba MW |
893 | |
894 | for (;;) { | |
c2f5b650 MW |
895 | void *ctx; |
896 | nvme_completion_fn fn; | |
b60503ba | 897 | struct nvme_completion cqe = nvmeq->cqes[head]; |
82123460 | 898 | if ((le16_to_cpu(cqe.status) & 1) != phase) |
b60503ba MW |
899 | break; |
900 | nvmeq->sq_head = le16_to_cpu(cqe.sq_head); | |
901 | if (++head == nvmeq->q_depth) { | |
902 | head = 0; | |
82123460 | 903 | phase = !phase; |
b60503ba | 904 | } |
a0fa9647 JA |
905 | if (tag && *tag == cqe.command_id) |
906 | *tag = -1; | |
a4aea562 | 907 | ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn); |
edd10d33 | 908 | fn(nvmeq, ctx, &cqe); |
b60503ba MW |
909 | } |
910 | ||
911 | /* If the controller ignores the cq head doorbell and continuously | |
912 | * writes to the queue, it is theoretically possible to wrap around | |
913 | * the queue twice and mistakenly return IRQ_NONE. Linux only | |
914 | * requires that 0.1% of your interrupts are handled, so this isn't | |
915 | * a big problem. | |
916 | */ | |
82123460 | 917 | if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) |
a0fa9647 | 918 | return; |
b60503ba | 919 | |
604e8c8d KB |
920 | if (likely(nvmeq->cq_vector >= 0)) |
921 | writel(head, nvmeq->q_db + nvmeq->dev->db_stride); | |
b60503ba | 922 | nvmeq->cq_head = head; |
82123460 | 923 | nvmeq->cq_phase = phase; |
b60503ba | 924 | |
e9539f47 | 925 | nvmeq->cqe_seen = 1; |
a0fa9647 JA |
926 | } |
927 | ||
928 | static void nvme_process_cq(struct nvme_queue *nvmeq) | |
929 | { | |
930 | __nvme_process_cq(nvmeq, NULL); | |
b60503ba MW |
931 | } |
932 | ||
933 | static irqreturn_t nvme_irq(int irq, void *data) | |
58ffacb5 MW |
934 | { |
935 | irqreturn_t result; | |
936 | struct nvme_queue *nvmeq = data; | |
937 | spin_lock(&nvmeq->q_lock); | |
e9539f47 MW |
938 | nvme_process_cq(nvmeq); |
939 | result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; | |
940 | nvmeq->cqe_seen = 0; | |
58ffacb5 MW |
941 | spin_unlock(&nvmeq->q_lock); |
942 | return result; | |
943 | } | |
944 | ||
945 | static irqreturn_t nvme_irq_check(int irq, void *data) | |
946 | { | |
947 | struct nvme_queue *nvmeq = data; | |
948 | struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; | |
949 | if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) | |
950 | return IRQ_NONE; | |
951 | return IRQ_WAKE_THREAD; | |
952 | } | |
953 | ||
a0fa9647 JA |
954 | static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) |
955 | { | |
956 | struct nvme_queue *nvmeq = hctx->driver_data; | |
957 | ||
958 | if ((le16_to_cpu(nvmeq->cqes[nvmeq->cq_head].status) & 1) == | |
959 | nvmeq->cq_phase) { | |
960 | spin_lock_irq(&nvmeq->q_lock); | |
961 | __nvme_process_cq(nvmeq, &tag); | |
962 | spin_unlock_irq(&nvmeq->q_lock); | |
963 | ||
964 | if (tag == -1) | |
965 | return 1; | |
966 | } | |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
a4aea562 MB |
971 | static int nvme_submit_async_admin_req(struct nvme_dev *dev) |
972 | { | |
973 | struct nvme_queue *nvmeq = dev->queues[0]; | |
974 | struct nvme_command c; | |
975 | struct nvme_cmd_info *cmd_info; | |
976 | struct request *req; | |
977 | ||
1c63dc66 | 978 | req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, |
6f3b0e8b | 979 | BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED); |
9f173b33 DC |
980 | if (IS_ERR(req)) |
981 | return PTR_ERR(req); | |
a4aea562 | 982 | |
c917dfe5 | 983 | req->cmd_flags |= REQ_NO_TIMEOUT; |
a4aea562 | 984 | cmd_info = blk_mq_rq_to_pdu(req); |
1efccc9d | 985 | nvme_set_info(cmd_info, NULL, async_req_completion); |
a4aea562 MB |
986 | |
987 | memset(&c, 0, sizeof(c)); | |
988 | c.common.opcode = nvme_admin_async_event; | |
989 | c.common.command_id = req->tag; | |
990 | ||
42483228 | 991 | blk_mq_free_request(req); |
e3f879bf SB |
992 | __nvme_submit_cmd(nvmeq, &c); |
993 | return 0; | |
a4aea562 MB |
994 | } |
995 | ||
996 | static int nvme_submit_admin_async_cmd(struct nvme_dev *dev, | |
4d115420 KB |
997 | struct nvme_command *cmd, |
998 | struct async_cmd_info *cmdinfo, unsigned timeout) | |
999 | { | |
a4aea562 MB |
1000 | struct nvme_queue *nvmeq = dev->queues[0]; |
1001 | struct request *req; | |
1002 | struct nvme_cmd_info *cmd_rq; | |
4d115420 | 1003 | |
1c63dc66 | 1004 | req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, 0); |
9f173b33 DC |
1005 | if (IS_ERR(req)) |
1006 | return PTR_ERR(req); | |
a4aea562 MB |
1007 | |
1008 | req->timeout = timeout; | |
1009 | cmd_rq = blk_mq_rq_to_pdu(req); | |
1010 | cmdinfo->req = req; | |
1011 | nvme_set_info(cmd_rq, cmdinfo, async_completion); | |
4d115420 | 1012 | cmdinfo->status = -EINTR; |
a4aea562 MB |
1013 | |
1014 | cmd->common.command_id = req->tag; | |
1015 | ||
e3f879bf SB |
1016 | nvme_submit_cmd(nvmeq, cmd); |
1017 | return 0; | |
4d115420 KB |
1018 | } |
1019 | ||
b60503ba MW |
1020 | static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) |
1021 | { | |
b60503ba MW |
1022 | struct nvme_command c; |
1023 | ||
1024 | memset(&c, 0, sizeof(c)); | |
1025 | c.delete_queue.opcode = opcode; | |
1026 | c.delete_queue.qid = cpu_to_le16(id); | |
1027 | ||
1c63dc66 | 1028 | return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); |
b60503ba MW |
1029 | } |
1030 | ||
1031 | static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, | |
1032 | struct nvme_queue *nvmeq) | |
1033 | { | |
b60503ba MW |
1034 | struct nvme_command c; |
1035 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; | |
1036 | ||
d29ec824 CH |
1037 | /* |
1038 | * Note: we (ab)use the fact the the prp fields survive if no data | |
1039 | * is attached to the request. | |
1040 | */ | |
b60503ba MW |
1041 | memset(&c, 0, sizeof(c)); |
1042 | c.create_cq.opcode = nvme_admin_create_cq; | |
1043 | c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); | |
1044 | c.create_cq.cqid = cpu_to_le16(qid); | |
1045 | c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
1046 | c.create_cq.cq_flags = cpu_to_le16(flags); | |
1047 | c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); | |
1048 | ||
1c63dc66 | 1049 | return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); |
b60503ba MW |
1050 | } |
1051 | ||
1052 | static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, | |
1053 | struct nvme_queue *nvmeq) | |
1054 | { | |
b60503ba MW |
1055 | struct nvme_command c; |
1056 | int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; | |
1057 | ||
d29ec824 CH |
1058 | /* |
1059 | * Note: we (ab)use the fact the the prp fields survive if no data | |
1060 | * is attached to the request. | |
1061 | */ | |
b60503ba MW |
1062 | memset(&c, 0, sizeof(c)); |
1063 | c.create_sq.opcode = nvme_admin_create_sq; | |
1064 | c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); | |
1065 | c.create_sq.sqid = cpu_to_le16(qid); | |
1066 | c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); | |
1067 | c.create_sq.sq_flags = cpu_to_le16(flags); | |
1068 | c.create_sq.cqid = cpu_to_le16(qid); | |
1069 | ||
1c63dc66 | 1070 | return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); |
b60503ba MW |
1071 | } |
1072 | ||
1073 | static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) | |
1074 | { | |
1075 | return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); | |
1076 | } | |
1077 | ||
1078 | static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) | |
1079 | { | |
1080 | return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); | |
1081 | } | |
1082 | ||
31c7c7d2 | 1083 | static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) |
c30341dc | 1084 | { |
a4aea562 MB |
1085 | struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); |
1086 | struct nvme_queue *nvmeq = cmd_rq->nvmeq; | |
c30341dc | 1087 | struct nvme_dev *dev = nvmeq->dev; |
a4aea562 MB |
1088 | struct request *abort_req; |
1089 | struct nvme_cmd_info *abort_cmd; | |
1090 | struct nvme_command cmd; | |
c30341dc | 1091 | |
31c7c7d2 | 1092 | /* |
fd634f41 CH |
1093 | * Shutdown immediately if controller times out while starting. The |
1094 | * reset work will see the pci device disabled when it gets the forced | |
1095 | * cancellation error. All outstanding requests are completed on | |
1096 | * shutdown, so we return BLK_EH_HANDLED. | |
1097 | */ | |
1098 | if (test_bit(NVME_CTRL_RESETTING, &dev->flags)) { | |
1099 | dev_warn(dev->dev, | |
1100 | "I/O %d QID %d timeout, disable controller\n", | |
1101 | req->tag, nvmeq->qid); | |
1102 | nvme_dev_shutdown(dev); | |
1103 | req->errors = NVME_SC_CANCELLED; | |
1104 | return BLK_EH_HANDLED; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Shutdown the controller immediately and schedule a reset if the | |
1109 | * command was already aborted once before and still hasn't been | |
1110 | * returned to the driver, or if this is the admin queue. | |
31c7c7d2 | 1111 | */ |
a4aea562 | 1112 | if (!nvmeq->qid || cmd_rq->aborted) { |
e1569a16 KB |
1113 | dev_warn(dev->dev, |
1114 | "I/O %d QID %d timeout, reset controller\n", | |
1115 | req->tag, nvmeq->qid); | |
1116 | nvme_dev_shutdown(dev); | |
1117 | queue_work(nvme_workq, &dev->reset_work); | |
1118 | ||
1119 | /* | |
1120 | * Mark the request as handled, since the inline shutdown | |
1121 | * forces all outstanding requests to complete. | |
1122 | */ | |
1123 | req->errors = NVME_SC_CANCELLED; | |
1124 | return BLK_EH_HANDLED; | |
c30341dc KB |
1125 | } |
1126 | ||
6bf25d16 | 1127 | if (atomic_dec_and_test(&dev->ctrl.abort_limit)) |
31c7c7d2 | 1128 | return BLK_EH_RESET_TIMER; |
c30341dc | 1129 | |
1c63dc66 | 1130 | abort_req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, |
6f3b0e8b | 1131 | BLK_MQ_REQ_NOWAIT); |
6bf25d16 CH |
1132 | if (IS_ERR(abort_req)) { |
1133 | atomic_inc(&dev->ctrl.abort_limit); | |
31c7c7d2 | 1134 | return BLK_EH_RESET_TIMER; |
6bf25d16 | 1135 | } |
c30341dc | 1136 | |
a4aea562 MB |
1137 | abort_cmd = blk_mq_rq_to_pdu(abort_req); |
1138 | nvme_set_info(abort_cmd, abort_req, abort_completion); | |
1139 | ||
c30341dc KB |
1140 | memset(&cmd, 0, sizeof(cmd)); |
1141 | cmd.abort.opcode = nvme_admin_abort_cmd; | |
a4aea562 | 1142 | cmd.abort.cid = req->tag; |
c30341dc | 1143 | cmd.abort.sqid = cpu_to_le16(nvmeq->qid); |
a4aea562 | 1144 | cmd.abort.command_id = abort_req->tag; |
c30341dc | 1145 | |
a4aea562 | 1146 | cmd_rq->aborted = 1; |
c30341dc | 1147 | |
31c7c7d2 CH |
1148 | dev_warn(nvmeq->q_dmadev, "I/O %d QID %d timeout, aborting\n", |
1149 | req->tag, nvmeq->qid); | |
e3f879bf | 1150 | nvme_submit_cmd(dev->queues[0], &cmd); |
31c7c7d2 CH |
1151 | |
1152 | /* | |
1153 | * The aborted req will be completed on receiving the abort req. | |
1154 | * We enable the timer again. If hit twice, it'll cause a device reset, | |
1155 | * as the device then is in a faulty state. | |
1156 | */ | |
1157 | return BLK_EH_RESET_TIMER; | |
c30341dc KB |
1158 | } |
1159 | ||
42483228 | 1160 | static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved) |
a09115b2 | 1161 | { |
a4aea562 MB |
1162 | struct nvme_queue *nvmeq = data; |
1163 | void *ctx; | |
1164 | nvme_completion_fn fn; | |
1165 | struct nvme_cmd_info *cmd; | |
cef6a948 KB |
1166 | struct nvme_completion cqe; |
1167 | ||
1168 | if (!blk_mq_request_started(req)) | |
1169 | return; | |
a09115b2 | 1170 | |
a4aea562 | 1171 | cmd = blk_mq_rq_to_pdu(req); |
a09115b2 | 1172 | |
a4aea562 MB |
1173 | if (cmd->ctx == CMD_CTX_CANCELLED) |
1174 | return; | |
1175 | ||
cef6a948 KB |
1176 | if (blk_queue_dying(req->q)) |
1177 | cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1); | |
1178 | else | |
1179 | cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); | |
1180 | ||
1181 | ||
a4aea562 MB |
1182 | dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n", |
1183 | req->tag, nvmeq->qid); | |
1184 | ctx = cancel_cmd_info(cmd, &fn); | |
1185 | fn(nvmeq, ctx, &cqe); | |
a09115b2 MW |
1186 | } |
1187 | ||
a4aea562 MB |
1188 | static void nvme_free_queue(struct nvme_queue *nvmeq) |
1189 | { | |
9e866774 MW |
1190 | dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), |
1191 | (void *)nvmeq->cqes, nvmeq->cq_dma_addr); | |
8ffaadf7 JD |
1192 | if (nvmeq->sq_cmds) |
1193 | dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), | |
9e866774 MW |
1194 | nvmeq->sq_cmds, nvmeq->sq_dma_addr); |
1195 | kfree(nvmeq); | |
1196 | } | |
1197 | ||
a1a5ef99 | 1198 | static void nvme_free_queues(struct nvme_dev *dev, int lowest) |
22404274 KB |
1199 | { |
1200 | int i; | |
1201 | ||
a1a5ef99 | 1202 | for (i = dev->queue_count - 1; i >= lowest; i--) { |
a4aea562 | 1203 | struct nvme_queue *nvmeq = dev->queues[i]; |
22404274 | 1204 | dev->queue_count--; |
a4aea562 | 1205 | dev->queues[i] = NULL; |
f435c282 | 1206 | nvme_free_queue(nvmeq); |
121c7ad4 | 1207 | } |
22404274 KB |
1208 | } |
1209 | ||
4d115420 KB |
1210 | /** |
1211 | * nvme_suspend_queue - put queue into suspended state | |
1212 | * @nvmeq - queue to suspend | |
4d115420 KB |
1213 | */ |
1214 | static int nvme_suspend_queue(struct nvme_queue *nvmeq) | |
b60503ba | 1215 | { |
2b25d981 | 1216 | int vector; |
b60503ba | 1217 | |
a09115b2 | 1218 | spin_lock_irq(&nvmeq->q_lock); |
2b25d981 KB |
1219 | if (nvmeq->cq_vector == -1) { |
1220 | spin_unlock_irq(&nvmeq->q_lock); | |
1221 | return 1; | |
1222 | } | |
1223 | vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; | |
42f61420 | 1224 | nvmeq->dev->online_queues--; |
2b25d981 | 1225 | nvmeq->cq_vector = -1; |
a09115b2 MW |
1226 | spin_unlock_irq(&nvmeq->q_lock); |
1227 | ||
1c63dc66 CH |
1228 | if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) |
1229 | blk_mq_freeze_queue_start(nvmeq->dev->ctrl.admin_q); | |
6df3dbc8 | 1230 | |
aba2080f MW |
1231 | irq_set_affinity_hint(vector, NULL); |
1232 | free_irq(vector, nvmeq); | |
b60503ba | 1233 | |
4d115420 KB |
1234 | return 0; |
1235 | } | |
b60503ba | 1236 | |
4d115420 KB |
1237 | static void nvme_clear_queue(struct nvme_queue *nvmeq) |
1238 | { | |
22404274 | 1239 | spin_lock_irq(&nvmeq->q_lock); |
42483228 KB |
1240 | if (nvmeq->tags && *nvmeq->tags) |
1241 | blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq); | |
22404274 | 1242 | spin_unlock_irq(&nvmeq->q_lock); |
b60503ba MW |
1243 | } |
1244 | ||
4d115420 KB |
1245 | static void nvme_disable_queue(struct nvme_dev *dev, int qid) |
1246 | { | |
a4aea562 | 1247 | struct nvme_queue *nvmeq = dev->queues[qid]; |
4d115420 KB |
1248 | |
1249 | if (!nvmeq) | |
1250 | return; | |
1251 | if (nvme_suspend_queue(nvmeq)) | |
1252 | return; | |
1253 | ||
0e53d180 KB |
1254 | /* Don't tell the adapter to delete the admin queue. |
1255 | * Don't tell a removed adapter to delete IO queues. */ | |
7a67cbea | 1256 | if (qid && readl(dev->bar + NVME_REG_CSTS) != -1) { |
b60503ba MW |
1257 | adapter_delete_sq(dev, qid); |
1258 | adapter_delete_cq(dev, qid); | |
1259 | } | |
07836e65 KB |
1260 | |
1261 | spin_lock_irq(&nvmeq->q_lock); | |
1262 | nvme_process_cq(nvmeq); | |
1263 | spin_unlock_irq(&nvmeq->q_lock); | |
b60503ba MW |
1264 | } |
1265 | ||
8ffaadf7 JD |
1266 | static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, |
1267 | int entry_size) | |
1268 | { | |
1269 | int q_depth = dev->q_depth; | |
5fd4ce1b CH |
1270 | unsigned q_size_aligned = roundup(q_depth * entry_size, |
1271 | dev->ctrl.page_size); | |
8ffaadf7 JD |
1272 | |
1273 | if (q_size_aligned * nr_io_queues > dev->cmb_size) { | |
c45f5c99 | 1274 | u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); |
5fd4ce1b | 1275 | mem_per_q = round_down(mem_per_q, dev->ctrl.page_size); |
c45f5c99 | 1276 | q_depth = div_u64(mem_per_q, entry_size); |
8ffaadf7 JD |
1277 | |
1278 | /* | |
1279 | * Ensure the reduced q_depth is above some threshold where it | |
1280 | * would be better to map queues in system memory with the | |
1281 | * original depth | |
1282 | */ | |
1283 | if (q_depth < 64) | |
1284 | return -ENOMEM; | |
1285 | } | |
1286 | ||
1287 | return q_depth; | |
1288 | } | |
1289 | ||
1290 | static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, | |
1291 | int qid, int depth) | |
1292 | { | |
1293 | if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { | |
5fd4ce1b CH |
1294 | unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth), |
1295 | dev->ctrl.page_size); | |
8ffaadf7 JD |
1296 | nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; |
1297 | nvmeq->sq_cmds_io = dev->cmb + offset; | |
1298 | } else { | |
1299 | nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), | |
1300 | &nvmeq->sq_dma_addr, GFP_KERNEL); | |
1301 | if (!nvmeq->sq_cmds) | |
1302 | return -ENOMEM; | |
1303 | } | |
1304 | ||
1305 | return 0; | |
1306 | } | |
1307 | ||
b60503ba | 1308 | static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, |
2b25d981 | 1309 | int depth) |
b60503ba | 1310 | { |
a4aea562 | 1311 | struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); |
b60503ba MW |
1312 | if (!nvmeq) |
1313 | return NULL; | |
1314 | ||
e75ec752 | 1315 | nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), |
4d51abf9 | 1316 | &nvmeq->cq_dma_addr, GFP_KERNEL); |
b60503ba MW |
1317 | if (!nvmeq->cqes) |
1318 | goto free_nvmeq; | |
b60503ba | 1319 | |
8ffaadf7 | 1320 | if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) |
b60503ba MW |
1321 | goto free_cqdma; |
1322 | ||
e75ec752 | 1323 | nvmeq->q_dmadev = dev->dev; |
091b6092 | 1324 | nvmeq->dev = dev; |
3193f07b | 1325 | snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", |
1c63dc66 | 1326 | dev->ctrl.instance, qid); |
b60503ba MW |
1327 | spin_lock_init(&nvmeq->q_lock); |
1328 | nvmeq->cq_head = 0; | |
82123460 | 1329 | nvmeq->cq_phase = 1; |
b80d5ccc | 1330 | nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; |
b60503ba | 1331 | nvmeq->q_depth = depth; |
c30341dc | 1332 | nvmeq->qid = qid; |
758dd7fd | 1333 | nvmeq->cq_vector = -1; |
a4aea562 | 1334 | dev->queues[qid] = nvmeq; |
b60503ba | 1335 | |
36a7e993 JD |
1336 | /* make sure queue descriptor is set before queue count, for kthread */ |
1337 | mb(); | |
1338 | dev->queue_count++; | |
1339 | ||
b60503ba MW |
1340 | return nvmeq; |
1341 | ||
1342 | free_cqdma: | |
e75ec752 | 1343 | dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, |
b60503ba MW |
1344 | nvmeq->cq_dma_addr); |
1345 | free_nvmeq: | |
1346 | kfree(nvmeq); | |
1347 | return NULL; | |
1348 | } | |
1349 | ||
3001082c MW |
1350 | static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, |
1351 | const char *name) | |
1352 | { | |
58ffacb5 MW |
1353 | if (use_threaded_interrupts) |
1354 | return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, | |
481e5bad | 1355 | nvme_irq_check, nvme_irq, IRQF_SHARED, |
58ffacb5 | 1356 | name, nvmeq); |
3001082c | 1357 | return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, |
481e5bad | 1358 | IRQF_SHARED, name, nvmeq); |
3001082c MW |
1359 | } |
1360 | ||
22404274 | 1361 | static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) |
b60503ba | 1362 | { |
22404274 | 1363 | struct nvme_dev *dev = nvmeq->dev; |
b60503ba | 1364 | |
7be50e93 | 1365 | spin_lock_irq(&nvmeq->q_lock); |
22404274 KB |
1366 | nvmeq->sq_tail = 0; |
1367 | nvmeq->cq_head = 0; | |
1368 | nvmeq->cq_phase = 1; | |
b80d5ccc | 1369 | nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; |
22404274 | 1370 | memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); |
42f61420 | 1371 | dev->online_queues++; |
7be50e93 | 1372 | spin_unlock_irq(&nvmeq->q_lock); |
22404274 KB |
1373 | } |
1374 | ||
1375 | static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) | |
1376 | { | |
1377 | struct nvme_dev *dev = nvmeq->dev; | |
1378 | int result; | |
3f85d50b | 1379 | |
2b25d981 | 1380 | nvmeq->cq_vector = qid - 1; |
b60503ba MW |
1381 | result = adapter_alloc_cq(dev, qid, nvmeq); |
1382 | if (result < 0) | |
22404274 | 1383 | return result; |
b60503ba MW |
1384 | |
1385 | result = adapter_alloc_sq(dev, qid, nvmeq); | |
1386 | if (result < 0) | |
1387 | goto release_cq; | |
1388 | ||
3193f07b | 1389 | result = queue_request_irq(dev, nvmeq, nvmeq->irqname); |
b60503ba MW |
1390 | if (result < 0) |
1391 | goto release_sq; | |
1392 | ||
22404274 | 1393 | nvme_init_queue(nvmeq, qid); |
22404274 | 1394 | return result; |
b60503ba MW |
1395 | |
1396 | release_sq: | |
1397 | adapter_delete_sq(dev, qid); | |
1398 | release_cq: | |
1399 | adapter_delete_cq(dev, qid); | |
22404274 | 1400 | return result; |
b60503ba MW |
1401 | } |
1402 | ||
a4aea562 | 1403 | static struct blk_mq_ops nvme_mq_admin_ops = { |
d29ec824 | 1404 | .queue_rq = nvme_queue_rq, |
a4aea562 MB |
1405 | .map_queue = blk_mq_map_queue, |
1406 | .init_hctx = nvme_admin_init_hctx, | |
4af0e21c | 1407 | .exit_hctx = nvme_admin_exit_hctx, |
a4aea562 MB |
1408 | .init_request = nvme_admin_init_request, |
1409 | .timeout = nvme_timeout, | |
1410 | }; | |
1411 | ||
1412 | static struct blk_mq_ops nvme_mq_ops = { | |
1413 | .queue_rq = nvme_queue_rq, | |
1414 | .map_queue = blk_mq_map_queue, | |
1415 | .init_hctx = nvme_init_hctx, | |
1416 | .init_request = nvme_init_request, | |
1417 | .timeout = nvme_timeout, | |
a0fa9647 | 1418 | .poll = nvme_poll, |
a4aea562 MB |
1419 | }; |
1420 | ||
ea191d2f KB |
1421 | static void nvme_dev_remove_admin(struct nvme_dev *dev) |
1422 | { | |
1c63dc66 CH |
1423 | if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { |
1424 | blk_cleanup_queue(dev->ctrl.admin_q); | |
ea191d2f KB |
1425 | blk_mq_free_tag_set(&dev->admin_tagset); |
1426 | } | |
1427 | } | |
1428 | ||
a4aea562 MB |
1429 | static int nvme_alloc_admin_tags(struct nvme_dev *dev) |
1430 | { | |
1c63dc66 | 1431 | if (!dev->ctrl.admin_q) { |
a4aea562 MB |
1432 | dev->admin_tagset.ops = &nvme_mq_admin_ops; |
1433 | dev->admin_tagset.nr_hw_queues = 1; | |
1434 | dev->admin_tagset.queue_depth = NVME_AQ_DEPTH - 1; | |
1efccc9d | 1435 | dev->admin_tagset.reserved_tags = 1; |
a4aea562 | 1436 | dev->admin_tagset.timeout = ADMIN_TIMEOUT; |
e75ec752 | 1437 | dev->admin_tagset.numa_node = dev_to_node(dev->dev); |
ac3dd5bd | 1438 | dev->admin_tagset.cmd_size = nvme_cmd_size(dev); |
a4aea562 MB |
1439 | dev->admin_tagset.driver_data = dev; |
1440 | ||
1441 | if (blk_mq_alloc_tag_set(&dev->admin_tagset)) | |
1442 | return -ENOMEM; | |
1443 | ||
1c63dc66 CH |
1444 | dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); |
1445 | if (IS_ERR(dev->ctrl.admin_q)) { | |
a4aea562 MB |
1446 | blk_mq_free_tag_set(&dev->admin_tagset); |
1447 | return -ENOMEM; | |
1448 | } | |
1c63dc66 | 1449 | if (!blk_get_queue(dev->ctrl.admin_q)) { |
ea191d2f | 1450 | nvme_dev_remove_admin(dev); |
1c63dc66 | 1451 | dev->ctrl.admin_q = NULL; |
ea191d2f KB |
1452 | return -ENODEV; |
1453 | } | |
0fb59cbc | 1454 | } else |
1c63dc66 | 1455 | blk_mq_unfreeze_queue(dev->ctrl.admin_q); |
a4aea562 MB |
1456 | |
1457 | return 0; | |
1458 | } | |
1459 | ||
8d85fce7 | 1460 | static int nvme_configure_admin_queue(struct nvme_dev *dev) |
b60503ba | 1461 | { |
ba47e386 | 1462 | int result; |
b60503ba | 1463 | u32 aqa; |
7a67cbea | 1464 | u64 cap = lo_hi_readq(dev->bar + NVME_REG_CAP); |
b60503ba MW |
1465 | struct nvme_queue *nvmeq; |
1466 | ||
7a67cbea | 1467 | dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1) ? |
dfbac8c7 KB |
1468 | NVME_CAP_NSSRC(cap) : 0; |
1469 | ||
7a67cbea CH |
1470 | if (dev->subsystem && |
1471 | (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) | |
1472 | writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); | |
dfbac8c7 | 1473 | |
5fd4ce1b | 1474 | result = nvme_disable_ctrl(&dev->ctrl, cap); |
ba47e386 MW |
1475 | if (result < 0) |
1476 | return result; | |
b60503ba | 1477 | |
a4aea562 | 1478 | nvmeq = dev->queues[0]; |
cd638946 | 1479 | if (!nvmeq) { |
2b25d981 | 1480 | nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); |
cd638946 KB |
1481 | if (!nvmeq) |
1482 | return -ENOMEM; | |
cd638946 | 1483 | } |
b60503ba MW |
1484 | |
1485 | aqa = nvmeq->q_depth - 1; | |
1486 | aqa |= aqa << 16; | |
1487 | ||
7a67cbea CH |
1488 | writel(aqa, dev->bar + NVME_REG_AQA); |
1489 | lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); | |
1490 | lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); | |
b60503ba | 1491 | |
5fd4ce1b | 1492 | result = nvme_enable_ctrl(&dev->ctrl, cap); |
025c557a | 1493 | if (result) |
a4aea562 MB |
1494 | goto free_nvmeq; |
1495 | ||
2b25d981 | 1496 | nvmeq->cq_vector = 0; |
3193f07b | 1497 | result = queue_request_irq(dev, nvmeq, nvmeq->irqname); |
758dd7fd JD |
1498 | if (result) { |
1499 | nvmeq->cq_vector = -1; | |
0fb59cbc | 1500 | goto free_nvmeq; |
758dd7fd | 1501 | } |
025c557a | 1502 | |
b60503ba | 1503 | return result; |
a4aea562 | 1504 | |
a4aea562 MB |
1505 | free_nvmeq: |
1506 | nvme_free_queues(dev, 0); | |
1507 | return result; | |
b60503ba MW |
1508 | } |
1509 | ||
1fa6aead MW |
1510 | static int nvme_kthread(void *data) |
1511 | { | |
d4b4ff8e | 1512 | struct nvme_dev *dev, *next; |
1fa6aead MW |
1513 | |
1514 | while (!kthread_should_stop()) { | |
564a232c | 1515 | set_current_state(TASK_INTERRUPTIBLE); |
1fa6aead | 1516 | spin_lock(&dev_list_lock); |
d4b4ff8e | 1517 | list_for_each_entry_safe(dev, next, &dev_list, node) { |
1fa6aead | 1518 | int i; |
7a67cbea | 1519 | u32 csts = readl(dev->bar + NVME_REG_CSTS); |
dfbac8c7 | 1520 | |
846cc05f CH |
1521 | /* |
1522 | * Skip controllers currently under reset. | |
1523 | */ | |
1524 | if (work_pending(&dev->reset_work) || work_busy(&dev->reset_work)) | |
1525 | continue; | |
1526 | ||
dfbac8c7 KB |
1527 | if ((dev->subsystem && (csts & NVME_CSTS_NSSRO)) || |
1528 | csts & NVME_CSTS_CFS) { | |
846cc05f | 1529 | if (queue_work(nvme_workq, &dev->reset_work)) { |
90667892 CH |
1530 | dev_warn(dev->dev, |
1531 | "Failed status: %x, reset controller\n", | |
7a67cbea | 1532 | readl(dev->bar + NVME_REG_CSTS)); |
90667892 | 1533 | } |
d4b4ff8e KB |
1534 | continue; |
1535 | } | |
1fa6aead | 1536 | for (i = 0; i < dev->queue_count; i++) { |
a4aea562 | 1537 | struct nvme_queue *nvmeq = dev->queues[i]; |
740216fc MW |
1538 | if (!nvmeq) |
1539 | continue; | |
1fa6aead | 1540 | spin_lock_irq(&nvmeq->q_lock); |
bc57a0f7 | 1541 | nvme_process_cq(nvmeq); |
6fccf938 | 1542 | |
1c63dc66 | 1543 | while (i == 0 && dev->ctrl.event_limit > 0) { |
a4aea562 | 1544 | if (nvme_submit_async_admin_req(dev)) |
6fccf938 | 1545 | break; |
1c63dc66 | 1546 | dev->ctrl.event_limit--; |
6fccf938 | 1547 | } |
1fa6aead MW |
1548 | spin_unlock_irq(&nvmeq->q_lock); |
1549 | } | |
1550 | } | |
1551 | spin_unlock(&dev_list_lock); | |
acb7aa0d | 1552 | schedule_timeout(round_jiffies_relative(HZ)); |
1fa6aead MW |
1553 | } |
1554 | return 0; | |
1555 | } | |
1556 | ||
749941f2 | 1557 | static int nvme_create_io_queues(struct nvme_dev *dev) |
42f61420 | 1558 | { |
a4aea562 | 1559 | unsigned i; |
749941f2 | 1560 | int ret = 0; |
42f61420 | 1561 | |
749941f2 CH |
1562 | for (i = dev->queue_count; i <= dev->max_qid; i++) { |
1563 | if (!nvme_alloc_queue(dev, i, dev->q_depth)) { | |
1564 | ret = -ENOMEM; | |
42f61420 | 1565 | break; |
749941f2 CH |
1566 | } |
1567 | } | |
42f61420 | 1568 | |
749941f2 CH |
1569 | for (i = dev->online_queues; i <= dev->queue_count - 1; i++) { |
1570 | ret = nvme_create_queue(dev->queues[i], i); | |
1571 | if (ret) { | |
2659e57b | 1572 | nvme_free_queues(dev, i); |
42f61420 | 1573 | break; |
2659e57b | 1574 | } |
749941f2 CH |
1575 | } |
1576 | ||
1577 | /* | |
1578 | * Ignore failing Create SQ/CQ commands, we can continue with less | |
1579 | * than the desired aount of queues, and even a controller without | |
1580 | * I/O queues an still be used to issue admin commands. This might | |
1581 | * be useful to upgrade a buggy firmware for example. | |
1582 | */ | |
1583 | return ret >= 0 ? 0 : ret; | |
42f61420 KB |
1584 | } |
1585 | ||
8ffaadf7 JD |
1586 | static void __iomem *nvme_map_cmb(struct nvme_dev *dev) |
1587 | { | |
1588 | u64 szu, size, offset; | |
1589 | u32 cmbloc; | |
1590 | resource_size_t bar_size; | |
1591 | struct pci_dev *pdev = to_pci_dev(dev->dev); | |
1592 | void __iomem *cmb; | |
1593 | dma_addr_t dma_addr; | |
1594 | ||
1595 | if (!use_cmb_sqes) | |
1596 | return NULL; | |
1597 | ||
7a67cbea | 1598 | dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); |
8ffaadf7 JD |
1599 | if (!(NVME_CMB_SZ(dev->cmbsz))) |
1600 | return NULL; | |
1601 | ||
7a67cbea | 1602 | cmbloc = readl(dev->bar + NVME_REG_CMBLOC); |
8ffaadf7 JD |
1603 | |
1604 | szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); | |
1605 | size = szu * NVME_CMB_SZ(dev->cmbsz); | |
1606 | offset = szu * NVME_CMB_OFST(cmbloc); | |
1607 | bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); | |
1608 | ||
1609 | if (offset > bar_size) | |
1610 | return NULL; | |
1611 | ||
1612 | /* | |
1613 | * Controllers may support a CMB size larger than their BAR, | |
1614 | * for example, due to being behind a bridge. Reduce the CMB to | |
1615 | * the reported size of the BAR | |
1616 | */ | |
1617 | if (size > bar_size - offset) | |
1618 | size = bar_size - offset; | |
1619 | ||
1620 | dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; | |
1621 | cmb = ioremap_wc(dma_addr, size); | |
1622 | if (!cmb) | |
1623 | return NULL; | |
1624 | ||
1625 | dev->cmb_dma_addr = dma_addr; | |
1626 | dev->cmb_size = size; | |
1627 | return cmb; | |
1628 | } | |
1629 | ||
1630 | static inline void nvme_release_cmb(struct nvme_dev *dev) | |
1631 | { | |
1632 | if (dev->cmb) { | |
1633 | iounmap(dev->cmb); | |
1634 | dev->cmb = NULL; | |
1635 | } | |
1636 | } | |
1637 | ||
9d713c2b KB |
1638 | static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) |
1639 | { | |
b80d5ccc | 1640 | return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); |
9d713c2b KB |
1641 | } |
1642 | ||
8d85fce7 | 1643 | static int nvme_setup_io_queues(struct nvme_dev *dev) |
b60503ba | 1644 | { |
a4aea562 | 1645 | struct nvme_queue *adminq = dev->queues[0]; |
e75ec752 | 1646 | struct pci_dev *pdev = to_pci_dev(dev->dev); |
42f61420 | 1647 | int result, i, vecs, nr_io_queues, size; |
b60503ba | 1648 | |
42f61420 | 1649 | nr_io_queues = num_possible_cpus(); |
9a0be7ab CH |
1650 | result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); |
1651 | if (result < 0) | |
1b23484b | 1652 | return result; |
9a0be7ab CH |
1653 | |
1654 | /* | |
1655 | * Degraded controllers might return an error when setting the queue | |
1656 | * count. We still want to be able to bring them online and offer | |
1657 | * access to the admin queue, as that might be only way to fix them up. | |
1658 | */ | |
1659 | if (result > 0) { | |
1660 | dev_err(dev->dev, "Could not set queue count (%d)\n", result); | |
1661 | nr_io_queues = 0; | |
1662 | result = 0; | |
1663 | } | |
b60503ba | 1664 | |
8ffaadf7 JD |
1665 | if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { |
1666 | result = nvme_cmb_qdepth(dev, nr_io_queues, | |
1667 | sizeof(struct nvme_command)); | |
1668 | if (result > 0) | |
1669 | dev->q_depth = result; | |
1670 | else | |
1671 | nvme_release_cmb(dev); | |
1672 | } | |
1673 | ||
9d713c2b KB |
1674 | size = db_bar_size(dev, nr_io_queues); |
1675 | if (size > 8192) { | |
f1938f6e | 1676 | iounmap(dev->bar); |
9d713c2b KB |
1677 | do { |
1678 | dev->bar = ioremap(pci_resource_start(pdev, 0), size); | |
1679 | if (dev->bar) | |
1680 | break; | |
1681 | if (!--nr_io_queues) | |
1682 | return -ENOMEM; | |
1683 | size = db_bar_size(dev, nr_io_queues); | |
1684 | } while (1); | |
7a67cbea | 1685 | dev->dbs = dev->bar + 4096; |
5a92e700 | 1686 | adminq->q_db = dev->dbs; |
f1938f6e MW |
1687 | } |
1688 | ||
9d713c2b | 1689 | /* Deregister the admin queue's interrupt */ |
3193f07b | 1690 | free_irq(dev->entry[0].vector, adminq); |
9d713c2b | 1691 | |
e32efbfc JA |
1692 | /* |
1693 | * If we enable msix early due to not intx, disable it again before | |
1694 | * setting up the full range we need. | |
1695 | */ | |
1696 | if (!pdev->irq) | |
1697 | pci_disable_msix(pdev); | |
1698 | ||
be577fab | 1699 | for (i = 0; i < nr_io_queues; i++) |
1b23484b | 1700 | dev->entry[i].entry = i; |
be577fab AG |
1701 | vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); |
1702 | if (vecs < 0) { | |
1703 | vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); | |
1704 | if (vecs < 0) { | |
1705 | vecs = 1; | |
1706 | } else { | |
1707 | for (i = 0; i < vecs; i++) | |
1708 | dev->entry[i].vector = i + pdev->irq; | |
fa08a396 RRG |
1709 | } |
1710 | } | |
1711 | ||
063a8096 MW |
1712 | /* |
1713 | * Should investigate if there's a performance win from allocating | |
1714 | * more queues than interrupt vectors; it might allow the submission | |
1715 | * path to scale better, even if the receive path is limited by the | |
1716 | * number of interrupts. | |
1717 | */ | |
1718 | nr_io_queues = vecs; | |
42f61420 | 1719 | dev->max_qid = nr_io_queues; |
063a8096 | 1720 | |
3193f07b | 1721 | result = queue_request_irq(dev, adminq, adminq->irqname); |
758dd7fd JD |
1722 | if (result) { |
1723 | adminq->cq_vector = -1; | |
22404274 | 1724 | goto free_queues; |
758dd7fd | 1725 | } |
1b23484b | 1726 | |
cd638946 | 1727 | /* Free previously allocated queues that are no longer usable */ |
42f61420 | 1728 | nvme_free_queues(dev, nr_io_queues + 1); |
749941f2 | 1729 | return nvme_create_io_queues(dev); |
b60503ba | 1730 | |
22404274 | 1731 | free_queues: |
a1a5ef99 | 1732 | nvme_free_queues(dev, 1); |
22404274 | 1733 | return result; |
b60503ba MW |
1734 | } |
1735 | ||
bda4e0fb KB |
1736 | static void nvme_set_irq_hints(struct nvme_dev *dev) |
1737 | { | |
1738 | struct nvme_queue *nvmeq; | |
1739 | int i; | |
1740 | ||
1741 | for (i = 0; i < dev->online_queues; i++) { | |
1742 | nvmeq = dev->queues[i]; | |
1743 | ||
1744 | if (!nvmeq->tags || !(*nvmeq->tags)) | |
1745 | continue; | |
1746 | ||
1747 | irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, | |
1748 | blk_mq_tags_cpumask(*nvmeq->tags)); | |
1749 | } | |
1750 | } | |
1751 | ||
a5768aa8 KB |
1752 | static void nvme_dev_scan(struct work_struct *work) |
1753 | { | |
1754 | struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work); | |
a5768aa8 KB |
1755 | |
1756 | if (!dev->tagset.tags) | |
1757 | return; | |
5bae7f73 | 1758 | nvme_scan_namespaces(&dev->ctrl); |
bda4e0fb | 1759 | nvme_set_irq_hints(dev); |
a5768aa8 KB |
1760 | } |
1761 | ||
422ef0c7 MW |
1762 | /* |
1763 | * Return: error value if an error occurred setting up the queues or calling | |
1764 | * Identify Device. 0 if these succeeded, even if adding some of the | |
1765 | * namespaces failed. At the moment, these failures are silent. TBD which | |
1766 | * failures should be reported. | |
1767 | */ | |
8d85fce7 | 1768 | static int nvme_dev_add(struct nvme_dev *dev) |
b60503ba | 1769 | { |
5bae7f73 | 1770 | if (!dev->ctrl.tagset) { |
ffe7704d KB |
1771 | dev->tagset.ops = &nvme_mq_ops; |
1772 | dev->tagset.nr_hw_queues = dev->online_queues - 1; | |
1773 | dev->tagset.timeout = NVME_IO_TIMEOUT; | |
1774 | dev->tagset.numa_node = dev_to_node(dev->dev); | |
1775 | dev->tagset.queue_depth = | |
a4aea562 | 1776 | min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; |
ffe7704d KB |
1777 | dev->tagset.cmd_size = nvme_cmd_size(dev); |
1778 | dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; | |
1779 | dev->tagset.driver_data = dev; | |
b60503ba | 1780 | |
ffe7704d KB |
1781 | if (blk_mq_alloc_tag_set(&dev->tagset)) |
1782 | return 0; | |
5bae7f73 | 1783 | dev->ctrl.tagset = &dev->tagset; |
ffe7704d | 1784 | } |
a5768aa8 | 1785 | schedule_work(&dev->scan_work); |
e1e5e564 | 1786 | return 0; |
b60503ba MW |
1787 | } |
1788 | ||
0877cb0d KB |
1789 | static int nvme_dev_map(struct nvme_dev *dev) |
1790 | { | |
42f61420 | 1791 | u64 cap; |
0877cb0d | 1792 | int bars, result = -ENOMEM; |
e75ec752 | 1793 | struct pci_dev *pdev = to_pci_dev(dev->dev); |
0877cb0d KB |
1794 | |
1795 | if (pci_enable_device_mem(pdev)) | |
1796 | return result; | |
1797 | ||
1798 | dev->entry[0].vector = pdev->irq; | |
1799 | pci_set_master(pdev); | |
1800 | bars = pci_select_bars(pdev, IORESOURCE_MEM); | |
be7837e8 JA |
1801 | if (!bars) |
1802 | goto disable_pci; | |
1803 | ||
0877cb0d KB |
1804 | if (pci_request_selected_regions(pdev, bars, "nvme")) |
1805 | goto disable_pci; | |
1806 | ||
e75ec752 CH |
1807 | if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && |
1808 | dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) | |
052d0efa | 1809 | goto disable; |
0877cb0d | 1810 | |
0877cb0d KB |
1811 | dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); |
1812 | if (!dev->bar) | |
1813 | goto disable; | |
e32efbfc | 1814 | |
7a67cbea | 1815 | if (readl(dev->bar + NVME_REG_CSTS) == -1) { |
0e53d180 KB |
1816 | result = -ENODEV; |
1817 | goto unmap; | |
1818 | } | |
e32efbfc JA |
1819 | |
1820 | /* | |
1821 | * Some devices don't advertse INTx interrupts, pre-enable a single | |
1822 | * MSIX vec for setup. We'll adjust this later. | |
1823 | */ | |
1824 | if (!pdev->irq) { | |
1825 | result = pci_enable_msix(pdev, dev->entry, 1); | |
1826 | if (result < 0) | |
1827 | goto unmap; | |
1828 | } | |
1829 | ||
7a67cbea CH |
1830 | cap = lo_hi_readq(dev->bar + NVME_REG_CAP); |
1831 | ||
42f61420 KB |
1832 | dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); |
1833 | dev->db_stride = 1 << NVME_CAP_STRIDE(cap); | |
7a67cbea CH |
1834 | dev->dbs = dev->bar + 4096; |
1835 | if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2)) | |
8ffaadf7 | 1836 | dev->cmb = nvme_map_cmb(dev); |
0877cb0d KB |
1837 | |
1838 | return 0; | |
1839 | ||
0e53d180 KB |
1840 | unmap: |
1841 | iounmap(dev->bar); | |
1842 | dev->bar = NULL; | |
0877cb0d KB |
1843 | disable: |
1844 | pci_release_regions(pdev); | |
1845 | disable_pci: | |
1846 | pci_disable_device(pdev); | |
1847 | return result; | |
1848 | } | |
1849 | ||
1850 | static void nvme_dev_unmap(struct nvme_dev *dev) | |
1851 | { | |
e75ec752 CH |
1852 | struct pci_dev *pdev = to_pci_dev(dev->dev); |
1853 | ||
1854 | if (pdev->msi_enabled) | |
1855 | pci_disable_msi(pdev); | |
1856 | else if (pdev->msix_enabled) | |
1857 | pci_disable_msix(pdev); | |
0877cb0d KB |
1858 | |
1859 | if (dev->bar) { | |
1860 | iounmap(dev->bar); | |
1861 | dev->bar = NULL; | |
e75ec752 | 1862 | pci_release_regions(pdev); |
0877cb0d KB |
1863 | } |
1864 | ||
e75ec752 CH |
1865 | if (pci_is_enabled(pdev)) |
1866 | pci_disable_device(pdev); | |
0877cb0d KB |
1867 | } |
1868 | ||
4d115420 KB |
1869 | struct nvme_delq_ctx { |
1870 | struct task_struct *waiter; | |
1871 | struct kthread_worker *worker; | |
1872 | atomic_t refcount; | |
1873 | }; | |
1874 | ||
1875 | static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev) | |
1876 | { | |
1877 | dq->waiter = current; | |
1878 | mb(); | |
1879 | ||
1880 | for (;;) { | |
1881 | set_current_state(TASK_KILLABLE); | |
1882 | if (!atomic_read(&dq->refcount)) | |
1883 | break; | |
1884 | if (!schedule_timeout(ADMIN_TIMEOUT) || | |
1885 | fatal_signal_pending(current)) { | |
0fb59cbc KB |
1886 | /* |
1887 | * Disable the controller first since we can't trust it | |
1888 | * at this point, but leave the admin queue enabled | |
1889 | * until all queue deletion requests are flushed. | |
1890 | * FIXME: This may take a while if there are more h/w | |
1891 | * queues than admin tags. | |
1892 | */ | |
4d115420 | 1893 | set_current_state(TASK_RUNNING); |
5fd4ce1b | 1894 | nvme_disable_ctrl(&dev->ctrl, |
7a67cbea | 1895 | lo_hi_readq(dev->bar + NVME_REG_CAP)); |
0fb59cbc | 1896 | nvme_clear_queue(dev->queues[0]); |
4d115420 | 1897 | flush_kthread_worker(dq->worker); |
0fb59cbc | 1898 | nvme_disable_queue(dev, 0); |
4d115420 KB |
1899 | return; |
1900 | } | |
1901 | } | |
1902 | set_current_state(TASK_RUNNING); | |
1903 | } | |
1904 | ||
1905 | static void nvme_put_dq(struct nvme_delq_ctx *dq) | |
1906 | { | |
1907 | atomic_dec(&dq->refcount); | |
1908 | if (dq->waiter) | |
1909 | wake_up_process(dq->waiter); | |
1910 | } | |
1911 | ||
1912 | static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq) | |
1913 | { | |
1914 | atomic_inc(&dq->refcount); | |
1915 | return dq; | |
1916 | } | |
1917 | ||
1918 | static void nvme_del_queue_end(struct nvme_queue *nvmeq) | |
1919 | { | |
1920 | struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx; | |
4d115420 | 1921 | nvme_put_dq(dq); |
604e8c8d KB |
1922 | |
1923 | spin_lock_irq(&nvmeq->q_lock); | |
1924 | nvme_process_cq(nvmeq); | |
1925 | spin_unlock_irq(&nvmeq->q_lock); | |
4d115420 KB |
1926 | } |
1927 | ||
1928 | static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode, | |
1929 | kthread_work_func_t fn) | |
1930 | { | |
1931 | struct nvme_command c; | |
1932 | ||
1933 | memset(&c, 0, sizeof(c)); | |
1934 | c.delete_queue.opcode = opcode; | |
1935 | c.delete_queue.qid = cpu_to_le16(nvmeq->qid); | |
1936 | ||
1937 | init_kthread_work(&nvmeq->cmdinfo.work, fn); | |
a4aea562 MB |
1938 | return nvme_submit_admin_async_cmd(nvmeq->dev, &c, &nvmeq->cmdinfo, |
1939 | ADMIN_TIMEOUT); | |
4d115420 KB |
1940 | } |
1941 | ||
1942 | static void nvme_del_cq_work_handler(struct kthread_work *work) | |
1943 | { | |
1944 | struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, | |
1945 | cmdinfo.work); | |
1946 | nvme_del_queue_end(nvmeq); | |
1947 | } | |
1948 | ||
1949 | static int nvme_delete_cq(struct nvme_queue *nvmeq) | |
1950 | { | |
1951 | return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq, | |
1952 | nvme_del_cq_work_handler); | |
1953 | } | |
1954 | ||
1955 | static void nvme_del_sq_work_handler(struct kthread_work *work) | |
1956 | { | |
1957 | struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, | |
1958 | cmdinfo.work); | |
1959 | int status = nvmeq->cmdinfo.status; | |
1960 | ||
1961 | if (!status) | |
1962 | status = nvme_delete_cq(nvmeq); | |
1963 | if (status) | |
1964 | nvme_del_queue_end(nvmeq); | |
1965 | } | |
1966 | ||
1967 | static int nvme_delete_sq(struct nvme_queue *nvmeq) | |
1968 | { | |
1969 | return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq, | |
1970 | nvme_del_sq_work_handler); | |
1971 | } | |
1972 | ||
1973 | static void nvme_del_queue_start(struct kthread_work *work) | |
1974 | { | |
1975 | struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, | |
1976 | cmdinfo.work); | |
4d115420 KB |
1977 | if (nvme_delete_sq(nvmeq)) |
1978 | nvme_del_queue_end(nvmeq); | |
1979 | } | |
1980 | ||
1981 | static void nvme_disable_io_queues(struct nvme_dev *dev) | |
1982 | { | |
1983 | int i; | |
1984 | DEFINE_KTHREAD_WORKER_ONSTACK(worker); | |
1985 | struct nvme_delq_ctx dq; | |
1986 | struct task_struct *kworker_task = kthread_run(kthread_worker_fn, | |
1c63dc66 | 1987 | &worker, "nvme%d", dev->ctrl.instance); |
4d115420 KB |
1988 | |
1989 | if (IS_ERR(kworker_task)) { | |
e75ec752 | 1990 | dev_err(dev->dev, |
4d115420 KB |
1991 | "Failed to create queue del task\n"); |
1992 | for (i = dev->queue_count - 1; i > 0; i--) | |
1993 | nvme_disable_queue(dev, i); | |
1994 | return; | |
1995 | } | |
1996 | ||
1997 | dq.waiter = NULL; | |
1998 | atomic_set(&dq.refcount, 0); | |
1999 | dq.worker = &worker; | |
2000 | for (i = dev->queue_count - 1; i > 0; i--) { | |
a4aea562 | 2001 | struct nvme_queue *nvmeq = dev->queues[i]; |
4d115420 KB |
2002 | |
2003 | if (nvme_suspend_queue(nvmeq)) | |
2004 | continue; | |
2005 | nvmeq->cmdinfo.ctx = nvme_get_dq(&dq); | |
2006 | nvmeq->cmdinfo.worker = dq.worker; | |
2007 | init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start); | |
2008 | queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work); | |
2009 | } | |
2010 | nvme_wait_dq(&dq, dev); | |
2011 | kthread_stop(kworker_task); | |
2012 | } | |
2013 | ||
7385014c CH |
2014 | static int nvme_dev_list_add(struct nvme_dev *dev) |
2015 | { | |
2016 | bool start_thread = false; | |
2017 | ||
2018 | spin_lock(&dev_list_lock); | |
2019 | if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) { | |
2020 | start_thread = true; | |
2021 | nvme_thread = NULL; | |
2022 | } | |
2023 | list_add(&dev->node, &dev_list); | |
2024 | spin_unlock(&dev_list_lock); | |
2025 | ||
2026 | if (start_thread) { | |
2027 | nvme_thread = kthread_run(nvme_kthread, NULL, "nvme"); | |
2028 | wake_up_all(&nvme_kthread_wait); | |
2029 | } else | |
2030 | wait_event_killable(nvme_kthread_wait, nvme_thread); | |
2031 | ||
2032 | if (IS_ERR_OR_NULL(nvme_thread)) | |
2033 | return nvme_thread ? PTR_ERR(nvme_thread) : -EINTR; | |
2034 | ||
2035 | return 0; | |
2036 | } | |
2037 | ||
b9afca3e DM |
2038 | /* |
2039 | * Remove the node from the device list and check | |
2040 | * for whether or not we need to stop the nvme_thread. | |
2041 | */ | |
2042 | static void nvme_dev_list_remove(struct nvme_dev *dev) | |
2043 | { | |
2044 | struct task_struct *tmp = NULL; | |
2045 | ||
2046 | spin_lock(&dev_list_lock); | |
2047 | list_del_init(&dev->node); | |
2048 | if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) { | |
2049 | tmp = nvme_thread; | |
2050 | nvme_thread = NULL; | |
2051 | } | |
2052 | spin_unlock(&dev_list_lock); | |
2053 | ||
2054 | if (tmp) | |
2055 | kthread_stop(tmp); | |
2056 | } | |
2057 | ||
c9d3bf88 KB |
2058 | static void nvme_freeze_queues(struct nvme_dev *dev) |
2059 | { | |
2060 | struct nvme_ns *ns; | |
2061 | ||
5bae7f73 | 2062 | list_for_each_entry(ns, &dev->ctrl.namespaces, list) { |
c9d3bf88 KB |
2063 | blk_mq_freeze_queue_start(ns->queue); |
2064 | ||
cddcd72b | 2065 | spin_lock_irq(ns->queue->queue_lock); |
c9d3bf88 | 2066 | queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); |
cddcd72b | 2067 | spin_unlock_irq(ns->queue->queue_lock); |
c9d3bf88 KB |
2068 | |
2069 | blk_mq_cancel_requeue_work(ns->queue); | |
2070 | blk_mq_stop_hw_queues(ns->queue); | |
2071 | } | |
2072 | } | |
2073 | ||
2074 | static void nvme_unfreeze_queues(struct nvme_dev *dev) | |
2075 | { | |
2076 | struct nvme_ns *ns; | |
2077 | ||
5bae7f73 | 2078 | list_for_each_entry(ns, &dev->ctrl.namespaces, list) { |
c9d3bf88 KB |
2079 | queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); |
2080 | blk_mq_unfreeze_queue(ns->queue); | |
2081 | blk_mq_start_stopped_hw_queues(ns->queue, true); | |
2082 | blk_mq_kick_requeue_list(ns->queue); | |
2083 | } | |
2084 | } | |
2085 | ||
f0b50732 | 2086 | static void nvme_dev_shutdown(struct nvme_dev *dev) |
b60503ba | 2087 | { |
22404274 | 2088 | int i; |
7c1b2450 | 2089 | u32 csts = -1; |
22404274 | 2090 | |
b9afca3e | 2091 | nvme_dev_list_remove(dev); |
1fa6aead | 2092 | |
77bf25ea | 2093 | mutex_lock(&dev->shutdown_lock); |
c9d3bf88 KB |
2094 | if (dev->bar) { |
2095 | nvme_freeze_queues(dev); | |
7a67cbea | 2096 | csts = readl(dev->bar + NVME_REG_CSTS); |
c9d3bf88 | 2097 | } |
7c1b2450 | 2098 | if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { |
4d115420 | 2099 | for (i = dev->queue_count - 1; i >= 0; i--) { |
a4aea562 | 2100 | struct nvme_queue *nvmeq = dev->queues[i]; |
4d115420 | 2101 | nvme_suspend_queue(nvmeq); |
4d115420 KB |
2102 | } |
2103 | } else { | |
2104 | nvme_disable_io_queues(dev); | |
5fd4ce1b | 2105 | nvme_shutdown_ctrl(&dev->ctrl); |
4d115420 KB |
2106 | nvme_disable_queue(dev, 0); |
2107 | } | |
f0b50732 | 2108 | nvme_dev_unmap(dev); |
07836e65 KB |
2109 | |
2110 | for (i = dev->queue_count - 1; i >= 0; i--) | |
2111 | nvme_clear_queue(dev->queues[i]); | |
77bf25ea | 2112 | mutex_unlock(&dev->shutdown_lock); |
f0b50732 KB |
2113 | } |
2114 | ||
091b6092 MW |
2115 | static int nvme_setup_prp_pools(struct nvme_dev *dev) |
2116 | { | |
e75ec752 | 2117 | dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, |
091b6092 MW |
2118 | PAGE_SIZE, PAGE_SIZE, 0); |
2119 | if (!dev->prp_page_pool) | |
2120 | return -ENOMEM; | |
2121 | ||
99802a7a | 2122 | /* Optimisation for I/Os between 4k and 128k */ |
e75ec752 | 2123 | dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, |
99802a7a MW |
2124 | 256, 256, 0); |
2125 | if (!dev->prp_small_pool) { | |
2126 | dma_pool_destroy(dev->prp_page_pool); | |
2127 | return -ENOMEM; | |
2128 | } | |
091b6092 MW |
2129 | return 0; |
2130 | } | |
2131 | ||
2132 | static void nvme_release_prp_pools(struct nvme_dev *dev) | |
2133 | { | |
2134 | dma_pool_destroy(dev->prp_page_pool); | |
99802a7a | 2135 | dma_pool_destroy(dev->prp_small_pool); |
091b6092 MW |
2136 | } |
2137 | ||
1673f1f0 | 2138 | static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) |
5e82e952 | 2139 | { |
1673f1f0 | 2140 | struct nvme_dev *dev = to_nvme_dev(ctrl); |
9ac27090 | 2141 | |
e75ec752 | 2142 | put_device(dev->dev); |
4af0e21c KB |
2143 | if (dev->tagset.tags) |
2144 | blk_mq_free_tag_set(&dev->tagset); | |
1c63dc66 CH |
2145 | if (dev->ctrl.admin_q) |
2146 | blk_put_queue(dev->ctrl.admin_q); | |
5e82e952 KB |
2147 | kfree(dev->queues); |
2148 | kfree(dev->entry); | |
2149 | kfree(dev); | |
2150 | } | |
2151 | ||
fd634f41 | 2152 | static void nvme_reset_work(struct work_struct *work) |
f0b50732 | 2153 | { |
fd634f41 | 2154 | struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work); |
3cf519b5 | 2155 | int result; |
f0b50732 | 2156 | |
fd634f41 CH |
2157 | if (WARN_ON(test_bit(NVME_CTRL_RESETTING, &dev->flags))) |
2158 | goto out; | |
2159 | ||
2160 | /* | |
2161 | * If we're called to reset a live controller first shut it down before | |
2162 | * moving on. | |
2163 | */ | |
2164 | if (dev->bar) | |
2165 | nvme_dev_shutdown(dev); | |
2166 | ||
2167 | set_bit(NVME_CTRL_RESETTING, &dev->flags); | |
2168 | ||
f0b50732 KB |
2169 | result = nvme_dev_map(dev); |
2170 | if (result) | |
3cf519b5 | 2171 | goto out; |
f0b50732 KB |
2172 | |
2173 | result = nvme_configure_admin_queue(dev); | |
2174 | if (result) | |
2175 | goto unmap; | |
2176 | ||
a4aea562 | 2177 | nvme_init_queue(dev->queues[0], 0); |
0fb59cbc KB |
2178 | result = nvme_alloc_admin_tags(dev); |
2179 | if (result) | |
2180 | goto disable; | |
b9afca3e | 2181 | |
ce4541f4 CH |
2182 | result = nvme_init_identify(&dev->ctrl); |
2183 | if (result) | |
2184 | goto free_tags; | |
2185 | ||
f0b50732 | 2186 | result = nvme_setup_io_queues(dev); |
badc34d4 | 2187 | if (result) |
0fb59cbc | 2188 | goto free_tags; |
f0b50732 | 2189 | |
1c63dc66 | 2190 | dev->ctrl.event_limit = 1; |
3cf519b5 | 2191 | |
7385014c CH |
2192 | result = nvme_dev_list_add(dev); |
2193 | if (result) | |
2194 | goto remove; | |
2195 | ||
2659e57b CH |
2196 | /* |
2197 | * Keep the controller around but remove all namespaces if we don't have | |
2198 | * any working I/O queue. | |
2199 | */ | |
3cf519b5 CH |
2200 | if (dev->online_queues < 2) { |
2201 | dev_warn(dev->dev, "IO queues not created\n"); | |
5bae7f73 | 2202 | nvme_remove_namespaces(&dev->ctrl); |
3cf519b5 CH |
2203 | } else { |
2204 | nvme_unfreeze_queues(dev); | |
2205 | nvme_dev_add(dev); | |
2206 | } | |
2207 | ||
fd634f41 | 2208 | clear_bit(NVME_CTRL_RESETTING, &dev->flags); |
3cf519b5 | 2209 | return; |
f0b50732 | 2210 | |
7385014c CH |
2211 | remove: |
2212 | nvme_dev_list_remove(dev); | |
0fb59cbc KB |
2213 | free_tags: |
2214 | nvme_dev_remove_admin(dev); | |
1c63dc66 CH |
2215 | blk_put_queue(dev->ctrl.admin_q); |
2216 | dev->ctrl.admin_q = NULL; | |
4af0e21c | 2217 | dev->queues[0]->tags = NULL; |
f0b50732 | 2218 | disable: |
a1a5ef99 | 2219 | nvme_disable_queue(dev, 0); |
f0b50732 KB |
2220 | unmap: |
2221 | nvme_dev_unmap(dev); | |
3cf519b5 | 2222 | out: |
5c8809e6 | 2223 | nvme_remove_dead_ctrl(dev); |
f0b50732 KB |
2224 | } |
2225 | ||
5c8809e6 | 2226 | static void nvme_remove_dead_ctrl_work(struct work_struct *work) |
9a6b9458 | 2227 | { |
5c8809e6 | 2228 | struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work); |
e75ec752 | 2229 | struct pci_dev *pdev = to_pci_dev(dev->dev); |
9a6b9458 KB |
2230 | |
2231 | if (pci_get_drvdata(pdev)) | |
c81f4975 | 2232 | pci_stop_and_remove_bus_device_locked(pdev); |
1673f1f0 | 2233 | nvme_put_ctrl(&dev->ctrl); |
9a6b9458 KB |
2234 | } |
2235 | ||
5c8809e6 | 2236 | static void nvme_remove_dead_ctrl(struct nvme_dev *dev) |
de3eff2b | 2237 | { |
5c8809e6 | 2238 | dev_warn(dev->dev, "Removing after probe failure\n"); |
1673f1f0 | 2239 | kref_get(&dev->ctrl.kref); |
5c8809e6 | 2240 | if (!schedule_work(&dev->remove_work)) |
1673f1f0 | 2241 | nvme_put_ctrl(&dev->ctrl); |
de3eff2b KB |
2242 | } |
2243 | ||
4cc06521 KB |
2244 | static int nvme_reset(struct nvme_dev *dev) |
2245 | { | |
1c63dc66 | 2246 | if (!dev->ctrl.admin_q || blk_queue_dying(dev->ctrl.admin_q)) |
4cc06521 KB |
2247 | return -ENODEV; |
2248 | ||
846cc05f CH |
2249 | if (!queue_work(nvme_workq, &dev->reset_work)) |
2250 | return -EBUSY; | |
4cc06521 | 2251 | |
846cc05f | 2252 | flush_work(&dev->reset_work); |
846cc05f | 2253 | return 0; |
4cc06521 KB |
2254 | } |
2255 | ||
1c63dc66 CH |
2256 | static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) |
2257 | { | |
2258 | *val = readl(to_nvme_dev(ctrl)->bar + off); | |
2259 | return 0; | |
2260 | } | |
2261 | ||
5fd4ce1b CH |
2262 | static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) |
2263 | { | |
2264 | writel(val, to_nvme_dev(ctrl)->bar + off); | |
2265 | return 0; | |
2266 | } | |
2267 | ||
7fd8930f CH |
2268 | static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) |
2269 | { | |
2270 | *val = readq(to_nvme_dev(ctrl)->bar + off); | |
2271 | return 0; | |
2272 | } | |
2273 | ||
5bae7f73 CH |
2274 | static bool nvme_pci_io_incapable(struct nvme_ctrl *ctrl) |
2275 | { | |
2276 | struct nvme_dev *dev = to_nvme_dev(ctrl); | |
2277 | ||
2278 | return !dev->bar || dev->online_queues < 2; | |
2279 | } | |
2280 | ||
f3ca80fc CH |
2281 | static int nvme_pci_reset_ctrl(struct nvme_ctrl *ctrl) |
2282 | { | |
2283 | return nvme_reset(to_nvme_dev(ctrl)); | |
2284 | } | |
2285 | ||
1c63dc66 CH |
2286 | static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { |
2287 | .reg_read32 = nvme_pci_reg_read32, | |
5fd4ce1b | 2288 | .reg_write32 = nvme_pci_reg_write32, |
7fd8930f | 2289 | .reg_read64 = nvme_pci_reg_read64, |
5bae7f73 | 2290 | .io_incapable = nvme_pci_io_incapable, |
f3ca80fc | 2291 | .reset_ctrl = nvme_pci_reset_ctrl, |
1673f1f0 | 2292 | .free_ctrl = nvme_pci_free_ctrl, |
1c63dc66 CH |
2293 | }; |
2294 | ||
8d85fce7 | 2295 | static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
b60503ba | 2296 | { |
a4aea562 | 2297 | int node, result = -ENOMEM; |
b60503ba MW |
2298 | struct nvme_dev *dev; |
2299 | ||
a4aea562 MB |
2300 | node = dev_to_node(&pdev->dev); |
2301 | if (node == NUMA_NO_NODE) | |
2302 | set_dev_node(&pdev->dev, 0); | |
2303 | ||
2304 | dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); | |
b60503ba MW |
2305 | if (!dev) |
2306 | return -ENOMEM; | |
a4aea562 MB |
2307 | dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), |
2308 | GFP_KERNEL, node); | |
b60503ba MW |
2309 | if (!dev->entry) |
2310 | goto free; | |
a4aea562 MB |
2311 | dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), |
2312 | GFP_KERNEL, node); | |
b60503ba MW |
2313 | if (!dev->queues) |
2314 | goto free; | |
2315 | ||
e75ec752 | 2316 | dev->dev = get_device(&pdev->dev); |
9a6b9458 | 2317 | pci_set_drvdata(pdev, dev); |
1c63dc66 | 2318 | |
f3ca80fc CH |
2319 | INIT_LIST_HEAD(&dev->node); |
2320 | INIT_WORK(&dev->scan_work, nvme_dev_scan); | |
f3ca80fc | 2321 | INIT_WORK(&dev->reset_work, nvme_reset_work); |
5c8809e6 | 2322 | INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); |
77bf25ea | 2323 | mutex_init(&dev->shutdown_lock); |
1c63dc66 | 2324 | |
f3ca80fc | 2325 | result = nvme_setup_prp_pools(dev); |
cd58ad7d | 2326 | if (result) |
a96d4f5c | 2327 | goto put_pci; |
b60503ba | 2328 | |
f3ca80fc CH |
2329 | result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, |
2330 | id->driver_data); | |
091b6092 | 2331 | if (result) |
2e1d8448 | 2332 | goto release_pools; |
740216fc | 2333 | |
fd634f41 | 2334 | schedule_work(&dev->reset_work); |
b60503ba MW |
2335 | return 0; |
2336 | ||
0877cb0d | 2337 | release_pools: |
091b6092 | 2338 | nvme_release_prp_pools(dev); |
a96d4f5c | 2339 | put_pci: |
e75ec752 | 2340 | put_device(dev->dev); |
b60503ba MW |
2341 | free: |
2342 | kfree(dev->queues); | |
2343 | kfree(dev->entry); | |
2344 | kfree(dev); | |
2345 | return result; | |
2346 | } | |
2347 | ||
f0d54a54 KB |
2348 | static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) |
2349 | { | |
a6739479 | 2350 | struct nvme_dev *dev = pci_get_drvdata(pdev); |
f0d54a54 | 2351 | |
a6739479 KB |
2352 | if (prepare) |
2353 | nvme_dev_shutdown(dev); | |
2354 | else | |
fd634f41 | 2355 | schedule_work(&dev->reset_work); |
f0d54a54 KB |
2356 | } |
2357 | ||
09ece142 KB |
2358 | static void nvme_shutdown(struct pci_dev *pdev) |
2359 | { | |
2360 | struct nvme_dev *dev = pci_get_drvdata(pdev); | |
2361 | nvme_dev_shutdown(dev); | |
2362 | } | |
2363 | ||
8d85fce7 | 2364 | static void nvme_remove(struct pci_dev *pdev) |
b60503ba MW |
2365 | { |
2366 | struct nvme_dev *dev = pci_get_drvdata(pdev); | |
9a6b9458 KB |
2367 | |
2368 | spin_lock(&dev_list_lock); | |
2369 | list_del_init(&dev->node); | |
2370 | spin_unlock(&dev_list_lock); | |
2371 | ||
2372 | pci_set_drvdata(pdev, NULL); | |
2373 | flush_work(&dev->reset_work); | |
a5768aa8 | 2374 | flush_work(&dev->scan_work); |
5bae7f73 | 2375 | nvme_remove_namespaces(&dev->ctrl); |
3399a3f7 | 2376 | nvme_dev_shutdown(dev); |
a4aea562 | 2377 | nvme_dev_remove_admin(dev); |
a1a5ef99 | 2378 | nvme_free_queues(dev, 0); |
8ffaadf7 | 2379 | nvme_release_cmb(dev); |
9a6b9458 | 2380 | nvme_release_prp_pools(dev); |
1673f1f0 | 2381 | nvme_put_ctrl(&dev->ctrl); |
b60503ba MW |
2382 | } |
2383 | ||
2384 | /* These functions are yet to be implemented */ | |
2385 | #define nvme_error_detected NULL | |
2386 | #define nvme_dump_registers NULL | |
2387 | #define nvme_link_reset NULL | |
2388 | #define nvme_slot_reset NULL | |
2389 | #define nvme_error_resume NULL | |
cd638946 | 2390 | |
671a6018 | 2391 | #ifdef CONFIG_PM_SLEEP |
cd638946 KB |
2392 | static int nvme_suspend(struct device *dev) |
2393 | { | |
2394 | struct pci_dev *pdev = to_pci_dev(dev); | |
2395 | struct nvme_dev *ndev = pci_get_drvdata(pdev); | |
2396 | ||
2397 | nvme_dev_shutdown(ndev); | |
2398 | return 0; | |
2399 | } | |
2400 | ||
2401 | static int nvme_resume(struct device *dev) | |
2402 | { | |
2403 | struct pci_dev *pdev = to_pci_dev(dev); | |
2404 | struct nvme_dev *ndev = pci_get_drvdata(pdev); | |
cd638946 | 2405 | |
fd634f41 | 2406 | schedule_work(&ndev->reset_work); |
9a6b9458 | 2407 | return 0; |
cd638946 | 2408 | } |
671a6018 | 2409 | #endif |
cd638946 KB |
2410 | |
2411 | static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); | |
b60503ba | 2412 | |
1d352035 | 2413 | static const struct pci_error_handlers nvme_err_handler = { |
b60503ba MW |
2414 | .error_detected = nvme_error_detected, |
2415 | .mmio_enabled = nvme_dump_registers, | |
2416 | .link_reset = nvme_link_reset, | |
2417 | .slot_reset = nvme_slot_reset, | |
2418 | .resume = nvme_error_resume, | |
f0d54a54 | 2419 | .reset_notify = nvme_reset_notify, |
b60503ba MW |
2420 | }; |
2421 | ||
2422 | /* Move to pci_ids.h later */ | |
2423 | #define PCI_CLASS_STORAGE_EXPRESS 0x010802 | |
2424 | ||
6eb0d698 | 2425 | static const struct pci_device_id nvme_id_table[] = { |
106198ed CH |
2426 | { PCI_VDEVICE(INTEL, 0x0953), |
2427 | .driver_data = NVME_QUIRK_STRIPE_SIZE, }, | |
540c801c KB |
2428 | { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */ |
2429 | .driver_data = NVME_QUIRK_IDENTIFY_CNS, }, | |
b60503ba | 2430 | { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, |
c74dc780 | 2431 | { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, |
b60503ba MW |
2432 | { 0, } |
2433 | }; | |
2434 | MODULE_DEVICE_TABLE(pci, nvme_id_table); | |
2435 | ||
2436 | static struct pci_driver nvme_driver = { | |
2437 | .name = "nvme", | |
2438 | .id_table = nvme_id_table, | |
2439 | .probe = nvme_probe, | |
8d85fce7 | 2440 | .remove = nvme_remove, |
09ece142 | 2441 | .shutdown = nvme_shutdown, |
cd638946 KB |
2442 | .driver = { |
2443 | .pm = &nvme_dev_pm_ops, | |
2444 | }, | |
b60503ba MW |
2445 | .err_handler = &nvme_err_handler, |
2446 | }; | |
2447 | ||
2448 | static int __init nvme_init(void) | |
2449 | { | |
0ac13140 | 2450 | int result; |
1fa6aead | 2451 | |
b9afca3e | 2452 | init_waitqueue_head(&nvme_kthread_wait); |
b60503ba | 2453 | |
9a6b9458 KB |
2454 | nvme_workq = create_singlethread_workqueue("nvme"); |
2455 | if (!nvme_workq) | |
b9afca3e | 2456 | return -ENOMEM; |
9a6b9458 | 2457 | |
5bae7f73 | 2458 | result = nvme_core_init(); |
5c42ea16 | 2459 | if (result < 0) |
9a6b9458 | 2460 | goto kill_workq; |
b60503ba | 2461 | |
f3db22fe KB |
2462 | result = pci_register_driver(&nvme_driver); |
2463 | if (result) | |
f3ca80fc | 2464 | goto core_exit; |
1fa6aead | 2465 | return 0; |
b60503ba | 2466 | |
f3ca80fc | 2467 | core_exit: |
5bae7f73 | 2468 | nvme_core_exit(); |
9a6b9458 KB |
2469 | kill_workq: |
2470 | destroy_workqueue(nvme_workq); | |
b60503ba MW |
2471 | return result; |
2472 | } | |
2473 | ||
2474 | static void __exit nvme_exit(void) | |
2475 | { | |
2476 | pci_unregister_driver(&nvme_driver); | |
5bae7f73 | 2477 | nvme_core_exit(); |
9a6b9458 | 2478 | destroy_workqueue(nvme_workq); |
b9afca3e | 2479 | BUG_ON(nvme_thread && !IS_ERR(nvme_thread)); |
21bd78bc | 2480 | _nvme_check_size(); |
b60503ba MW |
2481 | } |
2482 | ||
2483 | MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); | |
2484 | MODULE_LICENSE("GPL"); | |
c78b4713 | 2485 | MODULE_VERSION("1.0"); |
b60503ba MW |
2486 | module_init(nvme_init); |
2487 | module_exit(nvme_exit); |