Commit | Line | Data |
---|---|---|
3bf2bd20 SL |
1 | /* |
2 | * Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and | |
3 | * Shaohua Li <shli@fb.com> | |
4 | */ | |
f2298c04 | 5 | #include <linux/module.h> |
fc1bc354 | 6 | |
f2298c04 JA |
7 | #include <linux/moduleparam.h> |
8 | #include <linux/sched.h> | |
9 | #include <linux/fs.h> | |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/blk-mq.h> | |
14 | #include <linux/hrtimer.h> | |
b2b7e001 | 15 | #include <linux/lightnvm.h> |
3bf2bd20 | 16 | #include <linux/configfs.h> |
2f54a613 | 17 | #include <linux/badblocks.h> |
f2298c04 | 18 | |
5bcd0e0c SL |
19 | #define SECTOR_SHIFT 9 |
20 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) | |
21 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) | |
22 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) | |
23 | #define SECTOR_MASK (PAGE_SECTORS - 1) | |
24 | ||
25 | #define FREE_BATCH 16 | |
26 | ||
eff2c4f1 SL |
27 | #define TICKS_PER_SEC 50ULL |
28 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
29 | ||
30 | static inline u64 mb_per_tick(int mbps) | |
31 | { | |
32 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
33 | } | |
f2298c04 JA |
34 | |
35 | struct nullb_cmd { | |
36 | struct list_head list; | |
37 | struct llist_node ll_list; | |
966a9671 | 38 | call_single_data_t csd; |
f2298c04 JA |
39 | struct request *rq; |
40 | struct bio *bio; | |
41 | unsigned int tag; | |
42 | struct nullb_queue *nq; | |
3c395a96 | 43 | struct hrtimer timer; |
5bcd0e0c | 44 | blk_status_t error; |
f2298c04 JA |
45 | }; |
46 | ||
47 | struct nullb_queue { | |
48 | unsigned long *tag_map; | |
49 | wait_queue_head_t wait; | |
50 | unsigned int queue_depth; | |
2984c868 | 51 | struct nullb_device *dev; |
f2298c04 JA |
52 | |
53 | struct nullb_cmd *cmds; | |
54 | }; | |
55 | ||
3bf2bd20 SL |
56 | /* |
57 | * Status flags for nullb_device. | |
58 | * | |
59 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
60 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 61 | * THROTTLED: Device is being throttled. |
deb78b41 | 62 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
63 | */ |
64 | enum nullb_device_flags { | |
65 | NULLB_DEV_FL_CONFIGURED = 0, | |
66 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 67 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 68 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
69 | }; |
70 | ||
5bcd0e0c SL |
71 | /* |
72 | * nullb_page is a page in memory for nullb devices. | |
73 | * | |
74 | * @page: The page holding the data. | |
75 | * @bitmap: The bitmap represents which sector in the page has data. | |
76 | * Each bit represents one block size. For example, sector 8 | |
77 | * will use the 7th bit | |
deb78b41 SL |
78 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
79 | * page is being flushing to storage. FREE means the cache page is freed and | |
80 | * should be skipped from flushing to storage. Please see | |
81 | * null_make_cache_space | |
5bcd0e0c SL |
82 | */ |
83 | struct nullb_page { | |
84 | struct page *page; | |
85 | unsigned long bitmap; | |
86 | }; | |
deb78b41 SL |
87 | #define NULLB_PAGE_LOCK (sizeof(unsigned long) * 8 - 1) |
88 | #define NULLB_PAGE_FREE (sizeof(unsigned long) * 8 - 2) | |
5bcd0e0c | 89 | |
2984c868 SL |
90 | struct nullb_device { |
91 | struct nullb *nullb; | |
3bf2bd20 | 92 | struct config_item item; |
5bcd0e0c | 93 | struct radix_tree_root data; /* data stored in the disk */ |
deb78b41 | 94 | struct radix_tree_root cache; /* disk cache data */ |
3bf2bd20 | 95 | unsigned long flags; /* device flags */ |
deb78b41 | 96 | unsigned int curr_cache; |
2f54a613 | 97 | struct badblocks badblocks; |
2984c868 SL |
98 | |
99 | unsigned long size; /* device size in MB */ | |
100 | unsigned long completion_nsec; /* time in ns to complete a request */ | |
deb78b41 | 101 | unsigned long cache_size; /* disk cache size in MB */ |
2984c868 SL |
102 | unsigned int submit_queues; /* number of submission queues */ |
103 | unsigned int home_node; /* home node for the device */ | |
104 | unsigned int queue_mode; /* block interface */ | |
105 | unsigned int blocksize; /* block size */ | |
106 | unsigned int irqmode; /* IRQ completion handler */ | |
107 | unsigned int hw_queue_depth; /* queue depth */ | |
cedcafad | 108 | unsigned int index; /* index of the disk, only valid with a disk */ |
eff2c4f1 | 109 | unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */ |
2984c868 SL |
110 | bool use_lightnvm; /* register as a LightNVM device */ |
111 | bool blocking; /* blocking blk-mq device */ | |
112 | bool use_per_node_hctx; /* use per-node allocation for hardware context */ | |
cedcafad | 113 | bool power; /* power on/off the device */ |
5bcd0e0c | 114 | bool memory_backed; /* if data is stored in memory */ |
306eb6b4 | 115 | bool discard; /* if support discard */ |
2984c868 SL |
116 | }; |
117 | ||
f2298c04 | 118 | struct nullb { |
2984c868 | 119 | struct nullb_device *dev; |
f2298c04 JA |
120 | struct list_head list; |
121 | unsigned int index; | |
122 | struct request_queue *q; | |
123 | struct gendisk *disk; | |
b0b4e09c | 124 | struct nvm_dev *ndev; |
82f402fe JA |
125 | struct blk_mq_tag_set *tag_set; |
126 | struct blk_mq_tag_set __tag_set; | |
f2298c04 | 127 | unsigned int queue_depth; |
eff2c4f1 SL |
128 | atomic_long_t cur_bytes; |
129 | struct hrtimer bw_timer; | |
deb78b41 | 130 | unsigned long cache_flush_pos; |
f2298c04 JA |
131 | spinlock_t lock; |
132 | ||
133 | struct nullb_queue *queues; | |
134 | unsigned int nr_queues; | |
b2b7e001 | 135 | char disk_name[DISK_NAME_LEN]; |
f2298c04 JA |
136 | }; |
137 | ||
138 | static LIST_HEAD(nullb_list); | |
139 | static struct mutex lock; | |
140 | static int null_major; | |
94bc02e3 | 141 | static DEFINE_IDA(nullb_indexes); |
6bb9535b | 142 | static struct kmem_cache *ppa_cache; |
82f402fe | 143 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 144 | |
f2298c04 JA |
145 | enum { |
146 | NULL_IRQ_NONE = 0, | |
147 | NULL_IRQ_SOFTIRQ = 1, | |
148 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 149 | }; |
f2298c04 | 150 | |
ce2c350b | 151 | enum { |
f2298c04 JA |
152 | NULL_Q_BIO = 0, |
153 | NULL_Q_RQ = 1, | |
154 | NULL_Q_MQ = 2, | |
155 | }; | |
156 | ||
2984c868 SL |
157 | static int g_submit_queues = 1; |
158 | module_param_named(submit_queues, g_submit_queues, int, S_IRUGO); | |
f2298c04 JA |
159 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
160 | ||
2984c868 SL |
161 | static int g_home_node = NUMA_NO_NODE; |
162 | module_param_named(home_node, g_home_node, int, S_IRUGO); | |
f2298c04 JA |
163 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
164 | ||
2984c868 | 165 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
166 | |
167 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
168 | { | |
169 | int ret, new_val; | |
170 | ||
171 | ret = kstrtoint(str, 10, &new_val); | |
172 | if (ret) | |
173 | return -EINVAL; | |
174 | ||
175 | if (new_val < min || new_val > max) | |
176 | return -EINVAL; | |
177 | ||
178 | *val = new_val; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
183 | { | |
2984c868 | 184 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
185 | } |
186 | ||
9c27847d | 187 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
188 | .set = null_set_queue_mode, |
189 | .get = param_get_int, | |
190 | }; | |
191 | ||
2984c868 | 192 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, S_IRUGO); |
54ae81cd | 193 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 194 | |
2984c868 SL |
195 | static int g_gb = 250; |
196 | module_param_named(gb, g_gb, int, S_IRUGO); | |
f2298c04 JA |
197 | MODULE_PARM_DESC(gb, "Size in GB"); |
198 | ||
2984c868 SL |
199 | static int g_bs = 512; |
200 | module_param_named(bs, g_bs, int, S_IRUGO); | |
f2298c04 JA |
201 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
202 | ||
82f402fe | 203 | static int nr_devices = 1; |
f2298c04 JA |
204 | module_param(nr_devices, int, S_IRUGO); |
205 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); | |
206 | ||
2984c868 SL |
207 | static bool g_use_lightnvm; |
208 | module_param_named(use_lightnvm, g_use_lightnvm, bool, S_IRUGO); | |
b2b7e001 MB |
209 | MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); |
210 | ||
2984c868 SL |
211 | static bool g_blocking; |
212 | module_param_named(blocking, g_blocking, bool, S_IRUGO); | |
db5bcf87 JA |
213 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
214 | ||
82f402fe JA |
215 | static bool shared_tags; |
216 | module_param(shared_tags, bool, S_IRUGO); | |
217 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); | |
218 | ||
2984c868 | 219 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
220 | |
221 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
222 | { | |
2984c868 | 223 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
224 | NULL_IRQ_TIMER); |
225 | } | |
226 | ||
9c27847d | 227 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
228 | .set = null_set_irqmode, |
229 | .get = param_get_int, | |
230 | }; | |
231 | ||
2984c868 | 232 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, S_IRUGO); |
f2298c04 JA |
233 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
234 | ||
2984c868 SL |
235 | static unsigned long g_completion_nsec = 10000; |
236 | module_param_named(completion_nsec, g_completion_nsec, ulong, S_IRUGO); | |
f2298c04 JA |
237 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
238 | ||
2984c868 SL |
239 | static int g_hw_queue_depth = 64; |
240 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, S_IRUGO); | |
f2298c04 JA |
241 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
242 | ||
2984c868 SL |
243 | static bool g_use_per_node_hctx; |
244 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, S_IRUGO); | |
20005244 | 245 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 246 | |
3bf2bd20 SL |
247 | static struct nullb_device *null_alloc_dev(void); |
248 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
249 | static void null_del_dev(struct nullb *nullb); |
250 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 251 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
252 | |
253 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
254 | { | |
255 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
256 | } | |
257 | ||
258 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
259 | { | |
260 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
261 | } | |
262 | ||
263 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
264 | char *page) | |
265 | { | |
266 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
267 | } | |
268 | ||
269 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
270 | { | |
271 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
272 | } | |
273 | ||
274 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
275 | const char *page, size_t count) | |
276 | { | |
277 | unsigned int tmp; | |
278 | int result; | |
279 | ||
280 | result = kstrtouint(page, 0, &tmp); | |
281 | if (result) | |
282 | return result; | |
283 | ||
284 | *val = tmp; | |
285 | return count; | |
286 | } | |
287 | ||
288 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
289 | const char *page, size_t count) | |
290 | { | |
291 | int result; | |
292 | unsigned long tmp; | |
293 | ||
294 | result = kstrtoul(page, 0, &tmp); | |
295 | if (result) | |
296 | return result; | |
297 | ||
298 | *val = tmp; | |
299 | return count; | |
300 | } | |
301 | ||
302 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
303 | size_t count) | |
304 | { | |
305 | bool tmp; | |
306 | int result; | |
307 | ||
308 | result = kstrtobool(page, &tmp); | |
309 | if (result) | |
310 | return result; | |
311 | ||
312 | *val = tmp; | |
313 | return count; | |
314 | } | |
315 | ||
316 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
317 | #define NULLB_DEVICE_ATTR(NAME, TYPE) \ | |
318 | static ssize_t \ | |
319 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
320 | { \ | |
321 | return nullb_device_##TYPE##_attr_show( \ | |
322 | to_nullb_device(item)->NAME, page); \ | |
323 | } \ | |
324 | static ssize_t \ | |
325 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
326 | size_t count) \ | |
327 | { \ | |
328 | if (test_bit(NULLB_DEV_FL_CONFIGURED, &to_nullb_device(item)->flags)) \ | |
329 | return -EBUSY; \ | |
330 | return nullb_device_##TYPE##_attr_store( \ | |
331 | &to_nullb_device(item)->NAME, page, count); \ | |
332 | } \ | |
333 | CONFIGFS_ATTR(nullb_device_, NAME); | |
334 | ||
335 | NULLB_DEVICE_ATTR(size, ulong); | |
336 | NULLB_DEVICE_ATTR(completion_nsec, ulong); | |
337 | NULLB_DEVICE_ATTR(submit_queues, uint); | |
338 | NULLB_DEVICE_ATTR(home_node, uint); | |
339 | NULLB_DEVICE_ATTR(queue_mode, uint); | |
340 | NULLB_DEVICE_ATTR(blocksize, uint); | |
341 | NULLB_DEVICE_ATTR(irqmode, uint); | |
342 | NULLB_DEVICE_ATTR(hw_queue_depth, uint); | |
cedcafad | 343 | NULLB_DEVICE_ATTR(index, uint); |
3bf2bd20 SL |
344 | NULLB_DEVICE_ATTR(use_lightnvm, bool); |
345 | NULLB_DEVICE_ATTR(blocking, bool); | |
346 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool); | |
5bcd0e0c | 347 | NULLB_DEVICE_ATTR(memory_backed, bool); |
306eb6b4 | 348 | NULLB_DEVICE_ATTR(discard, bool); |
eff2c4f1 | 349 | NULLB_DEVICE_ATTR(mbps, uint); |
deb78b41 | 350 | NULLB_DEVICE_ATTR(cache_size, ulong); |
3bf2bd20 | 351 | |
cedcafad SL |
352 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
353 | { | |
354 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
355 | } | |
356 | ||
357 | static ssize_t nullb_device_power_store(struct config_item *item, | |
358 | const char *page, size_t count) | |
359 | { | |
360 | struct nullb_device *dev = to_nullb_device(item); | |
361 | bool newp = false; | |
362 | ssize_t ret; | |
363 | ||
364 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
365 | if (ret < 0) | |
366 | return ret; | |
367 | ||
368 | if (!dev->power && newp) { | |
369 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
370 | return count; | |
371 | if (null_add_dev(dev)) { | |
372 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
373 | return -ENOMEM; | |
374 | } | |
375 | ||
376 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
377 | dev->power = newp; | |
b3c30512 | 378 | } else if (dev->power && !newp) { |
cedcafad SL |
379 | mutex_lock(&lock); |
380 | dev->power = newp; | |
381 | null_del_dev(dev->nullb); | |
382 | mutex_unlock(&lock); | |
383 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
384 | } | |
385 | ||
386 | return count; | |
387 | } | |
388 | ||
389 | CONFIGFS_ATTR(nullb_device_, power); | |
390 | ||
2f54a613 SL |
391 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
392 | { | |
393 | struct nullb_device *t_dev = to_nullb_device(item); | |
394 | ||
395 | return badblocks_show(&t_dev->badblocks, page, 0); | |
396 | } | |
397 | ||
398 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
399 | const char *page, size_t count) | |
400 | { | |
401 | struct nullb_device *t_dev = to_nullb_device(item); | |
402 | char *orig, *buf, *tmp; | |
403 | u64 start, end; | |
404 | int ret; | |
405 | ||
406 | orig = kstrndup(page, count, GFP_KERNEL); | |
407 | if (!orig) | |
408 | return -ENOMEM; | |
409 | ||
410 | buf = strstrip(orig); | |
411 | ||
412 | ret = -EINVAL; | |
413 | if (buf[0] != '+' && buf[0] != '-') | |
414 | goto out; | |
415 | tmp = strchr(&buf[1], '-'); | |
416 | if (!tmp) | |
417 | goto out; | |
418 | *tmp = '\0'; | |
419 | ret = kstrtoull(buf + 1, 0, &start); | |
420 | if (ret) | |
421 | goto out; | |
422 | ret = kstrtoull(tmp + 1, 0, &end); | |
423 | if (ret) | |
424 | goto out; | |
425 | ret = -EINVAL; | |
426 | if (start > end) | |
427 | goto out; | |
428 | /* enable badblocks */ | |
429 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
430 | if (buf[0] == '+') | |
431 | ret = badblocks_set(&t_dev->badblocks, start, | |
432 | end - start + 1, 1); | |
433 | else | |
434 | ret = badblocks_clear(&t_dev->badblocks, start, | |
435 | end - start + 1); | |
436 | if (ret == 0) | |
437 | ret = count; | |
438 | out: | |
439 | kfree(orig); | |
440 | return ret; | |
441 | } | |
442 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
443 | ||
3bf2bd20 SL |
444 | static struct configfs_attribute *nullb_device_attrs[] = { |
445 | &nullb_device_attr_size, | |
446 | &nullb_device_attr_completion_nsec, | |
447 | &nullb_device_attr_submit_queues, | |
448 | &nullb_device_attr_home_node, | |
449 | &nullb_device_attr_queue_mode, | |
450 | &nullb_device_attr_blocksize, | |
451 | &nullb_device_attr_irqmode, | |
452 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 453 | &nullb_device_attr_index, |
3bf2bd20 SL |
454 | &nullb_device_attr_use_lightnvm, |
455 | &nullb_device_attr_blocking, | |
456 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 457 | &nullb_device_attr_power, |
5bcd0e0c | 458 | &nullb_device_attr_memory_backed, |
306eb6b4 | 459 | &nullb_device_attr_discard, |
eff2c4f1 | 460 | &nullb_device_attr_mbps, |
deb78b41 | 461 | &nullb_device_attr_cache_size, |
2f54a613 | 462 | &nullb_device_attr_badblocks, |
3bf2bd20 SL |
463 | NULL, |
464 | }; | |
465 | ||
466 | static void nullb_device_release(struct config_item *item) | |
467 | { | |
5bcd0e0c SL |
468 | struct nullb_device *dev = to_nullb_device(item); |
469 | ||
2f54a613 | 470 | badblocks_exit(&dev->badblocks); |
deb78b41 | 471 | null_free_device_storage(dev, false); |
5bcd0e0c | 472 | null_free_dev(dev); |
3bf2bd20 SL |
473 | } |
474 | ||
475 | static struct configfs_item_operations nullb_device_ops = { | |
476 | .release = nullb_device_release, | |
477 | }; | |
478 | ||
479 | static struct config_item_type nullb_device_type = { | |
480 | .ct_item_ops = &nullb_device_ops, | |
481 | .ct_attrs = nullb_device_attrs, | |
482 | .ct_owner = THIS_MODULE, | |
483 | }; | |
484 | ||
485 | static struct | |
486 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
487 | { | |
488 | struct nullb_device *dev; | |
489 | ||
490 | dev = null_alloc_dev(); | |
491 | if (!dev) | |
492 | return ERR_PTR(-ENOMEM); | |
493 | ||
494 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
495 | ||
496 | return &dev->item; | |
497 | } | |
498 | ||
499 | static void | |
500 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
501 | { | |
cedcafad SL |
502 | struct nullb_device *dev = to_nullb_device(item); |
503 | ||
504 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
505 | mutex_lock(&lock); | |
506 | dev->power = false; | |
507 | null_del_dev(dev->nullb); | |
508 | mutex_unlock(&lock); | |
509 | } | |
510 | ||
3bf2bd20 SL |
511 | config_item_put(item); |
512 | } | |
513 | ||
514 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
515 | { | |
2f54a613 | 516 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks\n"); |
3bf2bd20 SL |
517 | } |
518 | ||
519 | CONFIGFS_ATTR_RO(memb_group_, features); | |
520 | ||
521 | static struct configfs_attribute *nullb_group_attrs[] = { | |
522 | &memb_group_attr_features, | |
523 | NULL, | |
524 | }; | |
525 | ||
526 | static struct configfs_group_operations nullb_group_ops = { | |
527 | .make_item = nullb_group_make_item, | |
528 | .drop_item = nullb_group_drop_item, | |
529 | }; | |
530 | ||
531 | static struct config_item_type nullb_group_type = { | |
532 | .ct_group_ops = &nullb_group_ops, | |
533 | .ct_attrs = nullb_group_attrs, | |
534 | .ct_owner = THIS_MODULE, | |
535 | }; | |
536 | ||
537 | static struct configfs_subsystem nullb_subsys = { | |
538 | .su_group = { | |
539 | .cg_item = { | |
540 | .ci_namebuf = "nullb", | |
541 | .ci_type = &nullb_group_type, | |
542 | }, | |
543 | }, | |
544 | }; | |
545 | ||
deb78b41 SL |
546 | static inline int null_cache_active(struct nullb *nullb) |
547 | { | |
548 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
549 | } | |
550 | ||
2984c868 SL |
551 | static struct nullb_device *null_alloc_dev(void) |
552 | { | |
553 | struct nullb_device *dev; | |
554 | ||
555 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
556 | if (!dev) | |
557 | return NULL; | |
5bcd0e0c | 558 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 559 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
560 | if (badblocks_init(&dev->badblocks, 0)) { |
561 | kfree(dev); | |
562 | return NULL; | |
563 | } | |
564 | ||
2984c868 SL |
565 | dev->size = g_gb * 1024; |
566 | dev->completion_nsec = g_completion_nsec; | |
567 | dev->submit_queues = g_submit_queues; | |
568 | dev->home_node = g_home_node; | |
569 | dev->queue_mode = g_queue_mode; | |
570 | dev->blocksize = g_bs; | |
571 | dev->irqmode = g_irqmode; | |
572 | dev->hw_queue_depth = g_hw_queue_depth; | |
573 | dev->use_lightnvm = g_use_lightnvm; | |
574 | dev->blocking = g_blocking; | |
575 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
576 | return dev; | |
577 | } | |
578 | ||
579 | static void null_free_dev(struct nullb_device *dev) | |
580 | { | |
581 | kfree(dev); | |
582 | } | |
583 | ||
f2298c04 JA |
584 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
585 | { | |
586 | clear_bit_unlock(tag, nq->tag_map); | |
587 | ||
588 | if (waitqueue_active(&nq->wait)) | |
589 | wake_up(&nq->wait); | |
590 | } | |
591 | ||
592 | static unsigned int get_tag(struct nullb_queue *nq) | |
593 | { | |
594 | unsigned int tag; | |
595 | ||
596 | do { | |
597 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
598 | if (tag >= nq->queue_depth) | |
599 | return -1U; | |
600 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
601 | ||
602 | return tag; | |
603 | } | |
604 | ||
605 | static void free_cmd(struct nullb_cmd *cmd) | |
606 | { | |
607 | put_tag(cmd->nq, cmd->tag); | |
608 | } | |
609 | ||
3c395a96 PV |
610 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
611 | ||
f2298c04 JA |
612 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
613 | { | |
614 | struct nullb_cmd *cmd; | |
615 | unsigned int tag; | |
616 | ||
617 | tag = get_tag(nq); | |
618 | if (tag != -1U) { | |
619 | cmd = &nq->cmds[tag]; | |
620 | cmd->tag = tag; | |
621 | cmd->nq = nq; | |
2984c868 | 622 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
623 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
624 | HRTIMER_MODE_REL); | |
625 | cmd->timer.function = null_cmd_timer_expired; | |
626 | } | |
f2298c04 JA |
627 | return cmd; |
628 | } | |
629 | ||
630 | return NULL; | |
631 | } | |
632 | ||
633 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
634 | { | |
635 | struct nullb_cmd *cmd; | |
636 | DEFINE_WAIT(wait); | |
637 | ||
638 | cmd = __alloc_cmd(nq); | |
639 | if (cmd || !can_wait) | |
640 | return cmd; | |
641 | ||
642 | do { | |
643 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
644 | cmd = __alloc_cmd(nq); | |
645 | if (cmd) | |
646 | break; | |
647 | ||
648 | io_schedule(); | |
649 | } while (1); | |
650 | ||
651 | finish_wait(&nq->wait, &wait); | |
652 | return cmd; | |
653 | } | |
654 | ||
655 | static void end_cmd(struct nullb_cmd *cmd) | |
656 | { | |
cf8ecc5a | 657 | struct request_queue *q = NULL; |
2984c868 | 658 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 659 | |
e8271201 MK |
660 | if (cmd->rq) |
661 | q = cmd->rq->q; | |
662 | ||
ce2c350b CH |
663 | switch (queue_mode) { |
664 | case NULL_Q_MQ: | |
5bcd0e0c | 665 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b CH |
666 | return; |
667 | case NULL_Q_RQ: | |
668 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
5bcd0e0c | 669 | blk_end_request_all(cmd->rq, cmd->error); |
ce2c350b CH |
670 | break; |
671 | case NULL_Q_BIO: | |
5bcd0e0c | 672 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 673 | bio_endio(cmd->bio); |
48cc661e | 674 | break; |
ce2c350b | 675 | } |
f2298c04 | 676 | |
48cc661e JA |
677 | free_cmd(cmd); |
678 | ||
cf8ecc5a | 679 | /* Restart queue if needed, as we are freeing a tag */ |
48cc661e | 680 | if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) { |
cf8ecc5a AA |
681 | unsigned long flags; |
682 | ||
683 | spin_lock_irqsave(q->queue_lock, flags); | |
48cc661e | 684 | blk_start_queue_async(q); |
cf8ecc5a | 685 | spin_unlock_irqrestore(q->queue_lock, flags); |
f2298c04 | 686 | } |
cf8ecc5a AA |
687 | } |
688 | ||
689 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
690 | { | |
691 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
692 | |
693 | return HRTIMER_NORESTART; | |
694 | } | |
695 | ||
696 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
697 | { | |
2984c868 | 698 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 699 | |
3c395a96 | 700 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
701 | } |
702 | ||
703 | static void null_softirq_done_fn(struct request *rq) | |
704 | { | |
2984c868 SL |
705 | struct nullb *nullb = rq->q->queuedata; |
706 | ||
707 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
d891fa70 JA |
708 | end_cmd(blk_mq_rq_to_pdu(rq)); |
709 | else | |
710 | end_cmd(rq->special); | |
f2298c04 JA |
711 | } |
712 | ||
5bcd0e0c SL |
713 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
714 | { | |
715 | struct nullb_page *t_page; | |
716 | ||
717 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
718 | if (!t_page) | |
719 | goto out; | |
720 | ||
721 | t_page->page = alloc_pages(gfp_flags, 0); | |
722 | if (!t_page->page) | |
723 | goto out_freepage; | |
724 | ||
725 | t_page->bitmap = 0; | |
726 | return t_page; | |
727 | out_freepage: | |
728 | kfree(t_page); | |
729 | out: | |
730 | return NULL; | |
731 | } | |
732 | ||
733 | static void null_free_page(struct nullb_page *t_page) | |
734 | { | |
deb78b41 SL |
735 | __set_bit(NULLB_PAGE_FREE, &t_page->bitmap); |
736 | if (test_bit(NULLB_PAGE_LOCK, &t_page->bitmap)) | |
737 | return; | |
5bcd0e0c SL |
738 | __free_page(t_page->page); |
739 | kfree(t_page); | |
740 | } | |
741 | ||
deb78b41 SL |
742 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
743 | bool is_cache) | |
5bcd0e0c SL |
744 | { |
745 | unsigned int sector_bit; | |
746 | u64 idx; | |
747 | struct nullb_page *t_page, *ret; | |
748 | struct radix_tree_root *root; | |
749 | ||
deb78b41 | 750 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
751 | idx = sector >> PAGE_SECTORS_SHIFT; |
752 | sector_bit = (sector & SECTOR_MASK); | |
753 | ||
754 | t_page = radix_tree_lookup(root, idx); | |
755 | if (t_page) { | |
756 | __clear_bit(sector_bit, &t_page->bitmap); | |
757 | ||
758 | if (!t_page->bitmap) { | |
759 | ret = radix_tree_delete_item(root, idx, t_page); | |
760 | WARN_ON(ret != t_page); | |
761 | null_free_page(ret); | |
deb78b41 SL |
762 | if (is_cache) |
763 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
764 | } |
765 | } | |
766 | } | |
767 | ||
768 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 769 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
770 | { |
771 | struct radix_tree_root *root; | |
772 | ||
deb78b41 | 773 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
774 | |
775 | if (radix_tree_insert(root, idx, t_page)) { | |
776 | null_free_page(t_page); | |
777 | t_page = radix_tree_lookup(root, idx); | |
778 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
779 | } else if (is_cache) |
780 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
781 | |
782 | return t_page; | |
783 | } | |
784 | ||
deb78b41 | 785 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
786 | { |
787 | unsigned long pos = 0; | |
788 | int nr_pages; | |
789 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
790 | struct radix_tree_root *root; | |
791 | ||
deb78b41 | 792 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
793 | |
794 | do { | |
795 | int i; | |
796 | ||
797 | nr_pages = radix_tree_gang_lookup(root, | |
798 | (void **)t_pages, pos, FREE_BATCH); | |
799 | ||
800 | for (i = 0; i < nr_pages; i++) { | |
801 | pos = t_pages[i]->page->index; | |
802 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
803 | WARN_ON(ret != t_pages[i]); | |
804 | null_free_page(ret); | |
805 | } | |
806 | ||
807 | pos++; | |
808 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
809 | |
810 | if (is_cache) | |
811 | dev->curr_cache = 0; | |
5bcd0e0c SL |
812 | } |
813 | ||
deb78b41 SL |
814 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
815 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
816 | { |
817 | unsigned int sector_bit; | |
818 | u64 idx; | |
819 | struct nullb_page *t_page; | |
deb78b41 | 820 | struct radix_tree_root *root; |
5bcd0e0c SL |
821 | |
822 | idx = sector >> PAGE_SECTORS_SHIFT; | |
823 | sector_bit = (sector & SECTOR_MASK); | |
824 | ||
deb78b41 SL |
825 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
826 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
827 | WARN_ON(t_page && t_page->page->index != idx); |
828 | ||
829 | if (t_page && (for_write || test_bit(sector_bit, &t_page->bitmap))) | |
830 | return t_page; | |
831 | ||
832 | return NULL; | |
833 | } | |
834 | ||
deb78b41 SL |
835 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
836 | sector_t sector, bool for_write, bool ignore_cache) | |
837 | { | |
838 | struct nullb_page *page = NULL; | |
839 | ||
840 | if (!ignore_cache) | |
841 | page = __null_lookup_page(nullb, sector, for_write, true); | |
842 | if (page) | |
843 | return page; | |
844 | return __null_lookup_page(nullb, sector, for_write, false); | |
845 | } | |
846 | ||
5bcd0e0c | 847 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
deb78b41 | 848 | sector_t sector, bool ignore_cache) |
5bcd0e0c SL |
849 | { |
850 | u64 idx; | |
851 | struct nullb_page *t_page; | |
852 | ||
deb78b41 | 853 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
854 | if (t_page) |
855 | return t_page; | |
856 | ||
857 | spin_unlock_irq(&nullb->lock); | |
858 | ||
859 | t_page = null_alloc_page(GFP_NOIO); | |
860 | if (!t_page) | |
861 | goto out_lock; | |
862 | ||
863 | if (radix_tree_preload(GFP_NOIO)) | |
864 | goto out_freepage; | |
865 | ||
866 | spin_lock_irq(&nullb->lock); | |
867 | idx = sector >> PAGE_SECTORS_SHIFT; | |
868 | t_page->page->index = idx; | |
deb78b41 | 869 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
870 | radix_tree_preload_end(); |
871 | ||
872 | return t_page; | |
873 | out_freepage: | |
874 | null_free_page(t_page); | |
875 | out_lock: | |
876 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
877 | return null_lookup_page(nullb, sector, true, ignore_cache); |
878 | } | |
879 | ||
880 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
881 | { | |
882 | int i; | |
883 | unsigned int offset; | |
884 | u64 idx; | |
885 | struct nullb_page *t_page, *ret; | |
886 | void *dst, *src; | |
887 | ||
888 | idx = c_page->page->index; | |
889 | ||
890 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
891 | ||
892 | __clear_bit(NULLB_PAGE_LOCK, &c_page->bitmap); | |
893 | if (test_bit(NULLB_PAGE_FREE, &c_page->bitmap)) { | |
894 | null_free_page(c_page); | |
895 | if (t_page && t_page->bitmap == 0) { | |
896 | ret = radix_tree_delete_item(&nullb->dev->data, | |
897 | idx, t_page); | |
898 | null_free_page(t_page); | |
899 | } | |
900 | return 0; | |
901 | } | |
902 | ||
903 | if (!t_page) | |
904 | return -ENOMEM; | |
905 | ||
906 | src = kmap_atomic(c_page->page); | |
907 | dst = kmap_atomic(t_page->page); | |
908 | ||
909 | for (i = 0; i < PAGE_SECTORS; | |
910 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
911 | if (test_bit(i, &c_page->bitmap)) { | |
912 | offset = (i << SECTOR_SHIFT); | |
913 | memcpy(dst + offset, src + offset, | |
914 | nullb->dev->blocksize); | |
915 | __set_bit(i, &t_page->bitmap); | |
916 | } | |
917 | } | |
918 | ||
919 | kunmap_atomic(dst); | |
920 | kunmap_atomic(src); | |
921 | ||
922 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
923 | null_free_page(ret); | |
924 | nullb->dev->curr_cache -= PAGE_SIZE; | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 930 | { |
deb78b41 SL |
931 | int i, err, nr_pages; |
932 | struct nullb_page *c_pages[FREE_BATCH]; | |
933 | unsigned long flushed = 0, one_round; | |
934 | ||
935 | again: | |
936 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
937 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
938 | return 0; | |
939 | ||
940 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
941 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
942 | /* | |
943 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
944 | * avoid race, we don't allow page free | |
945 | */ | |
946 | for (i = 0; i < nr_pages; i++) { | |
947 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
948 | /* | |
949 | * We found the page which is being flushed to disk by other | |
950 | * threads | |
951 | */ | |
952 | if (test_bit(NULLB_PAGE_LOCK, &c_pages[i]->bitmap)) | |
953 | c_pages[i] = NULL; | |
954 | else | |
955 | __set_bit(NULLB_PAGE_LOCK, &c_pages[i]->bitmap); | |
956 | } | |
957 | ||
958 | one_round = 0; | |
959 | for (i = 0; i < nr_pages; i++) { | |
960 | if (c_pages[i] == NULL) | |
961 | continue; | |
962 | err = null_flush_cache_page(nullb, c_pages[i]); | |
963 | if (err) | |
964 | return err; | |
965 | one_round++; | |
966 | } | |
967 | flushed += one_round << PAGE_SHIFT; | |
968 | ||
969 | if (n > flushed) { | |
970 | if (nr_pages == 0) | |
971 | nullb->cache_flush_pos = 0; | |
972 | if (one_round == 0) { | |
973 | /* give other threads a chance */ | |
974 | spin_unlock_irq(&nullb->lock); | |
975 | spin_lock_irq(&nullb->lock); | |
976 | } | |
977 | goto again; | |
978 | } | |
979 | return 0; | |
5bcd0e0c SL |
980 | } |
981 | ||
982 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 983 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
984 | { |
985 | size_t temp, count = 0; | |
986 | unsigned int offset; | |
987 | struct nullb_page *t_page; | |
988 | void *dst, *src; | |
989 | ||
990 | while (count < n) { | |
991 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
992 | ||
deb78b41 SL |
993 | if (null_cache_active(nullb) && !is_fua) |
994 | null_make_cache_space(nullb, PAGE_SIZE); | |
995 | ||
5bcd0e0c | 996 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
997 | t_page = null_insert_page(nullb, sector, |
998 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
999 | if (!t_page) |
1000 | return -ENOSPC; | |
1001 | ||
1002 | src = kmap_atomic(source); | |
1003 | dst = kmap_atomic(t_page->page); | |
1004 | memcpy(dst + offset, src + off + count, temp); | |
1005 | kunmap_atomic(dst); | |
1006 | kunmap_atomic(src); | |
1007 | ||
1008 | __set_bit(sector & SECTOR_MASK, &t_page->bitmap); | |
1009 | ||
deb78b41 SL |
1010 | if (is_fua) |
1011 | null_free_sector(nullb, sector, true); | |
1012 | ||
5bcd0e0c SL |
1013 | count += temp; |
1014 | sector += temp >> SECTOR_SHIFT; | |
1015 | } | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1020 | unsigned int off, sector_t sector, size_t n) | |
1021 | { | |
1022 | size_t temp, count = 0; | |
1023 | unsigned int offset; | |
1024 | struct nullb_page *t_page; | |
1025 | void *dst, *src; | |
1026 | ||
1027 | while (count < n) { | |
1028 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1029 | ||
1030 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1031 | t_page = null_lookup_page(nullb, sector, false, |
1032 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
1033 | |
1034 | dst = kmap_atomic(dest); | |
1035 | if (!t_page) { | |
1036 | memset(dst + off + count, 0, temp); | |
1037 | goto next; | |
1038 | } | |
1039 | src = kmap_atomic(t_page->page); | |
1040 | memcpy(dst + off + count, src + offset, temp); | |
1041 | kunmap_atomic(src); | |
1042 | next: | |
1043 | kunmap_atomic(dst); | |
1044 | ||
1045 | count += temp; | |
1046 | sector += temp >> SECTOR_SHIFT; | |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | ||
306eb6b4 SL |
1051 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
1052 | { | |
1053 | size_t temp; | |
1054 | ||
1055 | spin_lock_irq(&nullb->lock); | |
1056 | while (n > 0) { | |
1057 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1058 | null_free_sector(nullb, sector, false); |
1059 | if (null_cache_active(nullb)) | |
1060 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1061 | sector += temp >> SECTOR_SHIFT; |
1062 | n -= temp; | |
1063 | } | |
1064 | spin_unlock_irq(&nullb->lock); | |
1065 | } | |
1066 | ||
deb78b41 SL |
1067 | static int null_handle_flush(struct nullb *nullb) |
1068 | { | |
1069 | int err; | |
1070 | ||
1071 | if (!null_cache_active(nullb)) | |
1072 | return 0; | |
1073 | ||
1074 | spin_lock_irq(&nullb->lock); | |
1075 | while (true) { | |
1076 | err = null_make_cache_space(nullb, | |
1077 | nullb->dev->cache_size * 1024 * 1024); | |
1078 | if (err || nullb->dev->curr_cache == 0) | |
1079 | break; | |
1080 | } | |
1081 | ||
1082 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1083 | spin_unlock_irq(&nullb->lock); | |
1084 | return err; | |
1085 | } | |
1086 | ||
5bcd0e0c | 1087 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1088 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1089 | bool is_fua) | |
f2298c04 | 1090 | { |
5bcd0e0c SL |
1091 | int err = 0; |
1092 | ||
1093 | if (!is_write) { | |
1094 | err = copy_from_nullb(nullb, page, off, sector, len); | |
1095 | flush_dcache_page(page); | |
1096 | } else { | |
1097 | flush_dcache_page(page); | |
deb78b41 | 1098 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1099 | } |
1100 | ||
1101 | return err; | |
1102 | } | |
1103 | ||
1104 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1105 | { | |
1106 | struct request *rq = cmd->rq; | |
1107 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1108 | int err; | |
1109 | unsigned int len; | |
1110 | sector_t sector; | |
1111 | struct req_iterator iter; | |
1112 | struct bio_vec bvec; | |
1113 | ||
1114 | sector = blk_rq_pos(rq); | |
1115 | ||
306eb6b4 SL |
1116 | if (req_op(rq) == REQ_OP_DISCARD) { |
1117 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1118 | return 0; | |
1119 | } | |
1120 | ||
5bcd0e0c SL |
1121 | spin_lock_irq(&nullb->lock); |
1122 | rq_for_each_segment(bvec, rq, iter) { | |
1123 | len = bvec.bv_len; | |
1124 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1125 | op_is_write(req_op(rq)), sector, |
1126 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1127 | if (err) { |
1128 | spin_unlock_irq(&nullb->lock); | |
1129 | return err; | |
1130 | } | |
1131 | sector += len >> SECTOR_SHIFT; | |
1132 | } | |
1133 | spin_unlock_irq(&nullb->lock); | |
1134 | ||
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1139 | { | |
1140 | struct bio *bio = cmd->bio; | |
1141 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1142 | int err; | |
1143 | unsigned int len; | |
1144 | sector_t sector; | |
1145 | struct bio_vec bvec; | |
1146 | struct bvec_iter iter; | |
1147 | ||
1148 | sector = bio->bi_iter.bi_sector; | |
1149 | ||
306eb6b4 SL |
1150 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1151 | null_handle_discard(nullb, sector, | |
1152 | bio_sectors(bio) << SECTOR_SHIFT); | |
1153 | return 0; | |
1154 | } | |
1155 | ||
5bcd0e0c SL |
1156 | spin_lock_irq(&nullb->lock); |
1157 | bio_for_each_segment(bvec, bio, iter) { | |
1158 | len = bvec.bv_len; | |
1159 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1160 | op_is_write(bio_op(bio)), sector, |
1161 | bio_op(bio) & REQ_FUA); | |
5bcd0e0c SL |
1162 | if (err) { |
1163 | spin_unlock_irq(&nullb->lock); | |
1164 | return err; | |
1165 | } | |
1166 | sector += len >> SECTOR_SHIFT; | |
1167 | } | |
1168 | spin_unlock_irq(&nullb->lock); | |
1169 | return 0; | |
1170 | } | |
1171 | ||
eff2c4f1 SL |
1172 | static void null_stop_queue(struct nullb *nullb) |
1173 | { | |
1174 | struct request_queue *q = nullb->q; | |
1175 | ||
1176 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1177 | blk_mq_stop_hw_queues(q); | |
1178 | else { | |
1179 | spin_lock_irq(q->queue_lock); | |
1180 | blk_stop_queue(q); | |
1181 | spin_unlock_irq(q->queue_lock); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | static void null_restart_queue_async(struct nullb *nullb) | |
1186 | { | |
1187 | struct request_queue *q = nullb->q; | |
1188 | unsigned long flags; | |
1189 | ||
1190 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1191 | blk_mq_start_stopped_hw_queues(q, true); | |
1192 | else { | |
1193 | spin_lock_irqsave(q->queue_lock, flags); | |
1194 | blk_start_queue_async(q); | |
1195 | spin_unlock_irqrestore(q->queue_lock, flags); | |
1196 | } | |
1197 | } | |
1198 | ||
5bcd0e0c SL |
1199 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd) |
1200 | { | |
1201 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1202 | struct nullb *nullb = dev->nullb; |
5bcd0e0c SL |
1203 | int err = 0; |
1204 | ||
eff2c4f1 SL |
1205 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
1206 | struct request *rq = cmd->rq; | |
1207 | ||
1208 | if (!hrtimer_active(&nullb->bw_timer)) | |
1209 | hrtimer_restart(&nullb->bw_timer); | |
1210 | ||
1211 | if (atomic_long_sub_return(blk_rq_bytes(rq), | |
1212 | &nullb->cur_bytes) < 0) { | |
1213 | null_stop_queue(nullb); | |
1214 | /* race with timer */ | |
1215 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1216 | null_restart_queue_async(nullb); | |
1217 | if (dev->queue_mode == NULL_Q_RQ) { | |
1218 | struct request_queue *q = nullb->q; | |
1219 | ||
1220 | spin_lock_irq(q->queue_lock); | |
1221 | rq->rq_flags |= RQF_DONTPREP; | |
1222 | blk_requeue_request(q, rq); | |
1223 | spin_unlock_irq(q->queue_lock); | |
1224 | return BLK_STS_OK; | |
1225 | } else | |
1226 | /* requeue request */ | |
1227 | return BLK_STS_RESOURCE; | |
1228 | } | |
1229 | } | |
1230 | ||
2f54a613 SL |
1231 | if (nullb->dev->badblocks.shift != -1) { |
1232 | int bad_sectors; | |
1233 | sector_t sector, size, first_bad; | |
1234 | bool is_flush = true; | |
1235 | ||
1236 | if (dev->queue_mode == NULL_Q_BIO && | |
1237 | bio_op(cmd->bio) != REQ_OP_FLUSH) { | |
1238 | is_flush = false; | |
1239 | sector = cmd->bio->bi_iter.bi_sector; | |
1240 | size = bio_sectors(cmd->bio); | |
1241 | } | |
1242 | if (dev->queue_mode != NULL_Q_BIO && | |
1243 | req_op(cmd->rq) != REQ_OP_FLUSH) { | |
1244 | is_flush = false; | |
1245 | sector = blk_rq_pos(cmd->rq); | |
1246 | size = blk_rq_sectors(cmd->rq); | |
1247 | } | |
1248 | if (!is_flush && badblocks_check(&nullb->dev->badblocks, sector, | |
1249 | size, &first_bad, &bad_sectors)) { | |
1250 | cmd->error = BLK_STS_IOERR; | |
1251 | goto out; | |
1252 | } | |
1253 | } | |
1254 | ||
5bcd0e0c | 1255 | if (dev->memory_backed) { |
deb78b41 SL |
1256 | if (dev->queue_mode == NULL_Q_BIO) { |
1257 | if (bio_op(cmd->bio) == REQ_OP_FLUSH) | |
1258 | err = null_handle_flush(nullb); | |
1259 | else | |
1260 | err = null_handle_bio(cmd); | |
1261 | } else { | |
1262 | if (req_op(cmd->rq) == REQ_OP_FLUSH) | |
1263 | err = null_handle_flush(nullb); | |
1264 | else | |
1265 | err = null_handle_rq(cmd); | |
1266 | } | |
5bcd0e0c SL |
1267 | } |
1268 | cmd->error = errno_to_blk_status(err); | |
2f54a613 | 1269 | out: |
f2298c04 | 1270 | /* Complete IO by inline, softirq or timer */ |
5bcd0e0c | 1271 | switch (dev->irqmode) { |
f2298c04 | 1272 | case NULL_IRQ_SOFTIRQ: |
5bcd0e0c | 1273 | switch (dev->queue_mode) { |
ce2c350b | 1274 | case NULL_Q_MQ: |
08e0029a | 1275 | blk_mq_complete_request(cmd->rq); |
ce2c350b CH |
1276 | break; |
1277 | case NULL_Q_RQ: | |
1278 | blk_complete_request(cmd->rq); | |
1279 | break; | |
1280 | case NULL_Q_BIO: | |
1281 | /* | |
1282 | * XXX: no proper submitting cpu information available. | |
1283 | */ | |
1284 | end_cmd(cmd); | |
1285 | break; | |
1286 | } | |
1287 | break; | |
1288 | case NULL_IRQ_NONE: | |
f2298c04 | 1289 | end_cmd(cmd); |
f2298c04 JA |
1290 | break; |
1291 | case NULL_IRQ_TIMER: | |
1292 | null_cmd_end_timer(cmd); | |
1293 | break; | |
1294 | } | |
5bcd0e0c | 1295 | return BLK_STS_OK; |
f2298c04 JA |
1296 | } |
1297 | ||
eff2c4f1 SL |
1298 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1299 | { | |
1300 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1301 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1302 | unsigned int mbps = nullb->dev->mbps; | |
1303 | ||
1304 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1305 | return HRTIMER_NORESTART; | |
1306 | ||
1307 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1308 | null_restart_queue_async(nullb); | |
1309 | ||
1310 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1311 | ||
1312 | return HRTIMER_RESTART; | |
1313 | } | |
1314 | ||
1315 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1316 | { | |
1317 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1318 | ||
1319 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1320 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1321 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1322 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1323 | } |
1324 | ||
1325 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1326 | { | |
1327 | int index = 0; | |
1328 | ||
1329 | if (nullb->nr_queues != 1) | |
1330 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1331 | ||
1332 | return &nullb->queues[index]; | |
1333 | } | |
1334 | ||
dece1635 | 1335 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
1336 | { |
1337 | struct nullb *nullb = q->queuedata; | |
1338 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1339 | struct nullb_cmd *cmd; | |
1340 | ||
1341 | cmd = alloc_cmd(nq, 1); | |
1342 | cmd->bio = bio; | |
1343 | ||
1344 | null_handle_cmd(cmd); | |
dece1635 | 1345 | return BLK_QC_T_NONE; |
f2298c04 JA |
1346 | } |
1347 | ||
1348 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) | |
1349 | { | |
1350 | struct nullb *nullb = q->queuedata; | |
1351 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1352 | struct nullb_cmd *cmd; | |
1353 | ||
1354 | cmd = alloc_cmd(nq, 0); | |
1355 | if (cmd) { | |
1356 | cmd->rq = req; | |
1357 | req->special = cmd; | |
1358 | return BLKPREP_OK; | |
1359 | } | |
8b70f45e | 1360 | blk_stop_queue(q); |
f2298c04 JA |
1361 | |
1362 | return BLKPREP_DEFER; | |
1363 | } | |
1364 | ||
1365 | static void null_request_fn(struct request_queue *q) | |
1366 | { | |
1367 | struct request *rq; | |
1368 | ||
1369 | while ((rq = blk_fetch_request(q)) != NULL) { | |
1370 | struct nullb_cmd *cmd = rq->special; | |
1371 | ||
1372 | spin_unlock_irq(q->queue_lock); | |
1373 | null_handle_cmd(cmd); | |
1374 | spin_lock_irq(q->queue_lock); | |
1375 | } | |
1376 | } | |
1377 | ||
fc17b653 | 1378 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1379 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1380 | { |
74c45052 | 1381 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1382 | struct nullb_queue *nq = hctx->driver_data; |
f2298c04 | 1383 | |
db5bcf87 JA |
1384 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1385 | ||
2984c868 | 1386 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1387 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1388 | cmd->timer.function = null_cmd_timer_expired; | |
1389 | } | |
74c45052 | 1390 | cmd->rq = bd->rq; |
2984c868 | 1391 | cmd->nq = nq; |
f2298c04 | 1392 | |
74c45052 | 1393 | blk_mq_start_request(bd->rq); |
e2490073 | 1394 | |
5bcd0e0c | 1395 | return null_handle_cmd(cmd); |
f2298c04 JA |
1396 | } |
1397 | ||
f363b089 | 1398 | static const struct blk_mq_ops null_mq_ops = { |
f2298c04 | 1399 | .queue_rq = null_queue_rq, |
ce2c350b | 1400 | .complete = null_softirq_done_fn, |
f2298c04 JA |
1401 | }; |
1402 | ||
de65d2d2 MB |
1403 | static void cleanup_queue(struct nullb_queue *nq) |
1404 | { | |
1405 | kfree(nq->tag_map); | |
1406 | kfree(nq->cmds); | |
1407 | } | |
1408 | ||
1409 | static void cleanup_queues(struct nullb *nullb) | |
1410 | { | |
1411 | int i; | |
1412 | ||
1413 | for (i = 0; i < nullb->nr_queues; i++) | |
1414 | cleanup_queue(&nullb->queues[i]); | |
1415 | ||
1416 | kfree(nullb->queues); | |
1417 | } | |
1418 | ||
b2b7e001 MB |
1419 | #ifdef CONFIG_NVM |
1420 | ||
2a842aca | 1421 | static void null_lnvm_end_io(struct request *rq, blk_status_t status) |
b2b7e001 MB |
1422 | { |
1423 | struct nvm_rq *rqd = rq->end_io_data; | |
b2b7e001 | 1424 | |
2a842aca CH |
1425 | /* XXX: lighnvm core seems to expect NVM_RSP_* values here.. */ |
1426 | rqd->error = status ? -EIO : 0; | |
06894efe | 1427 | nvm_end_io(rqd); |
b2b7e001 MB |
1428 | |
1429 | blk_put_request(rq); | |
1430 | } | |
1431 | ||
16f26c3a | 1432 | static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) |
b2b7e001 | 1433 | { |
16f26c3a | 1434 | struct request_queue *q = dev->q; |
b2b7e001 MB |
1435 | struct request *rq; |
1436 | struct bio *bio = rqd->bio; | |
1437 | ||
aebf526b CH |
1438 | rq = blk_mq_alloc_request(q, |
1439 | op_is_write(bio_op(bio)) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); | |
b2b7e001 MB |
1440 | if (IS_ERR(rq)) |
1441 | return -ENOMEM; | |
1442 | ||
2644a3cc | 1443 | blk_init_request_from_bio(rq, bio); |
b2b7e001 MB |
1444 | |
1445 | rq->end_io_data = rqd; | |
1446 | ||
1447 | blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
16f26c3a | 1452 | static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id) |
b2b7e001 | 1453 | { |
2984c868 SL |
1454 | struct nullb *nullb = dev->q->queuedata; |
1455 | sector_t size = (sector_t)nullb->dev->size * 1024 * 1024ULL; | |
5b40db99 | 1456 | sector_t blksize; |
b2b7e001 MB |
1457 | struct nvm_id_group *grp; |
1458 | ||
1459 | id->ver_id = 0x1; | |
1460 | id->vmnt = 0; | |
bf643185 | 1461 | id->cap = 0x2; |
b2b7e001 | 1462 | id->dom = 0x1; |
5b40db99 MB |
1463 | |
1464 | id->ppaf.blk_offset = 0; | |
1465 | id->ppaf.blk_len = 16; | |
1466 | id->ppaf.pg_offset = 16; | |
1467 | id->ppaf.pg_len = 16; | |
1468 | id->ppaf.sect_offset = 32; | |
1469 | id->ppaf.sect_len = 8; | |
1470 | id->ppaf.pln_offset = 40; | |
1471 | id->ppaf.pln_len = 8; | |
1472 | id->ppaf.lun_offset = 48; | |
1473 | id->ppaf.lun_len = 8; | |
1474 | id->ppaf.ch_offset = 56; | |
1475 | id->ppaf.ch_len = 8; | |
b2b7e001 | 1476 | |
2984c868 | 1477 | sector_div(size, nullb->dev->blocksize); /* convert size to pages */ |
e93d12ae | 1478 | size >>= 8; /* concert size to pgs pr blk */ |
19bd6fe7 | 1479 | grp = &id->grp; |
b2b7e001 | 1480 | grp->mtype = 0; |
5b40db99 | 1481 | grp->fmtype = 0; |
b2b7e001 | 1482 | grp->num_ch = 1; |
b2b7e001 | 1483 | grp->num_pg = 256; |
5b40db99 | 1484 | blksize = size; |
e93d12ae | 1485 | size >>= 16; |
5b40db99 | 1486 | grp->num_lun = size + 1; |
e93d12ae | 1487 | sector_div(blksize, grp->num_lun); |
5b40db99 MB |
1488 | grp->num_blk = blksize; |
1489 | grp->num_pln = 1; | |
1490 | ||
2984c868 SL |
1491 | grp->fpg_sz = nullb->dev->blocksize; |
1492 | grp->csecs = nullb->dev->blocksize; | |
b2b7e001 MB |
1493 | grp->trdt = 25000; |
1494 | grp->trdm = 25000; | |
1495 | grp->tprt = 500000; | |
1496 | grp->tprm = 500000; | |
1497 | grp->tbet = 1500000; | |
1498 | grp->tbem = 1500000; | |
1499 | grp->mpos = 0x010101; /* single plane rwe */ | |
2984c868 | 1500 | grp->cpar = nullb->dev->hw_queue_depth; |
b2b7e001 MB |
1501 | |
1502 | return 0; | |
1503 | } | |
1504 | ||
16f26c3a | 1505 | static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name) |
b2b7e001 MB |
1506 | { |
1507 | mempool_t *virtmem_pool; | |
1508 | ||
6bb9535b | 1509 | virtmem_pool = mempool_create_slab_pool(64, ppa_cache); |
b2b7e001 MB |
1510 | if (!virtmem_pool) { |
1511 | pr_err("null_blk: Unable to create virtual memory pool\n"); | |
1512 | return NULL; | |
1513 | } | |
1514 | ||
1515 | return virtmem_pool; | |
1516 | } | |
1517 | ||
1518 | static void null_lnvm_destroy_dma_pool(void *pool) | |
1519 | { | |
1520 | mempool_destroy(pool); | |
1521 | } | |
1522 | ||
16f26c3a | 1523 | static void *null_lnvm_dev_dma_alloc(struct nvm_dev *dev, void *pool, |
b2b7e001 MB |
1524 | gfp_t mem_flags, dma_addr_t *dma_handler) |
1525 | { | |
1526 | return mempool_alloc(pool, mem_flags); | |
1527 | } | |
1528 | ||
1529 | static void null_lnvm_dev_dma_free(void *pool, void *entry, | |
1530 | dma_addr_t dma_handler) | |
1531 | { | |
1532 | mempool_free(entry, pool); | |
1533 | } | |
1534 | ||
1535 | static struct nvm_dev_ops null_lnvm_dev_ops = { | |
1536 | .identity = null_lnvm_id, | |
1537 | .submit_io = null_lnvm_submit_io, | |
1538 | ||
1539 | .create_dma_pool = null_lnvm_create_dma_pool, | |
1540 | .destroy_dma_pool = null_lnvm_destroy_dma_pool, | |
1541 | .dev_dma_alloc = null_lnvm_dev_dma_alloc, | |
1542 | .dev_dma_free = null_lnvm_dev_dma_free, | |
1543 | ||
1544 | /* Simulate nvme protocol restriction */ | |
1545 | .max_phys_sect = 64, | |
1546 | }; | |
9ae2d0aa MB |
1547 | |
1548 | static int null_nvm_register(struct nullb *nullb) | |
1549 | { | |
b0b4e09c MB |
1550 | struct nvm_dev *dev; |
1551 | int rv; | |
1552 | ||
1553 | dev = nvm_alloc_dev(0); | |
1554 | if (!dev) | |
1555 | return -ENOMEM; | |
1556 | ||
1557 | dev->q = nullb->q; | |
1558 | memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); | |
1559 | dev->ops = &null_lnvm_dev_ops; | |
1560 | ||
1561 | rv = nvm_register(dev); | |
1562 | if (rv) { | |
1563 | kfree(dev); | |
1564 | return rv; | |
1565 | } | |
1566 | nullb->ndev = dev; | |
1567 | return 0; | |
9ae2d0aa MB |
1568 | } |
1569 | ||
1570 | static void null_nvm_unregister(struct nullb *nullb) | |
1571 | { | |
b0b4e09c | 1572 | nvm_unregister(nullb->ndev); |
9ae2d0aa | 1573 | } |
b2b7e001 | 1574 | #else |
9ae2d0aa MB |
1575 | static int null_nvm_register(struct nullb *nullb) |
1576 | { | |
92153d30 | 1577 | pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n"); |
9ae2d0aa MB |
1578 | return -EINVAL; |
1579 | } | |
1580 | static void null_nvm_unregister(struct nullb *nullb) {} | |
b2b7e001 MB |
1581 | #endif /* CONFIG_NVM */ |
1582 | ||
9ae2d0aa MB |
1583 | static void null_del_dev(struct nullb *nullb) |
1584 | { | |
2984c868 SL |
1585 | struct nullb_device *dev = nullb->dev; |
1586 | ||
94bc02e3 SL |
1587 | ida_simple_remove(&nullb_indexes, nullb->index); |
1588 | ||
9ae2d0aa MB |
1589 | list_del_init(&nullb->list); |
1590 | ||
2984c868 | 1591 | if (dev->use_lightnvm) |
9ae2d0aa MB |
1592 | null_nvm_unregister(nullb); |
1593 | else | |
1594 | del_gendisk(nullb->disk); | |
eff2c4f1 SL |
1595 | |
1596 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1597 | hrtimer_cancel(&nullb->bw_timer); | |
1598 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1599 | null_restart_queue_async(nullb); | |
1600 | } | |
1601 | ||
9ae2d0aa | 1602 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1603 | if (dev->queue_mode == NULL_Q_MQ && |
1604 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1605 | blk_mq_free_tag_set(nullb->tag_set); |
2984c868 | 1606 | if (!dev->use_lightnvm) |
9ae2d0aa MB |
1607 | put_disk(nullb->disk); |
1608 | cleanup_queues(nullb); | |
deb78b41 SL |
1609 | if (null_cache_active(nullb)) |
1610 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1611 | kfree(nullb); |
2984c868 | 1612 | dev->nullb = NULL; |
9ae2d0aa MB |
1613 | } |
1614 | ||
306eb6b4 SL |
1615 | static void null_config_discard(struct nullb *nullb) |
1616 | { | |
1617 | if (nullb->dev->discard == false) | |
1618 | return; | |
1619 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1620 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1621 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
1622 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nullb->q); | |
9ae2d0aa MB |
1623 | } |
1624 | ||
f2298c04 JA |
1625 | static int null_open(struct block_device *bdev, fmode_t mode) |
1626 | { | |
1627 | return 0; | |
1628 | } | |
1629 | ||
1630 | static void null_release(struct gendisk *disk, fmode_t mode) | |
1631 | { | |
1632 | } | |
1633 | ||
1634 | static const struct block_device_operations null_fops = { | |
1635 | .owner = THIS_MODULE, | |
1636 | .open = null_open, | |
1637 | .release = null_release, | |
1638 | }; | |
1639 | ||
82f402fe JA |
1640 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1641 | { | |
1642 | BUG_ON(!nullb); | |
1643 | BUG_ON(!nq); | |
1644 | ||
1645 | init_waitqueue_head(&nq->wait); | |
1646 | nq->queue_depth = nullb->queue_depth; | |
2984c868 | 1647 | nq->dev = nullb->dev; |
82f402fe JA |
1648 | } |
1649 | ||
1650 | static void null_init_queues(struct nullb *nullb) | |
1651 | { | |
1652 | struct request_queue *q = nullb->q; | |
1653 | struct blk_mq_hw_ctx *hctx; | |
1654 | struct nullb_queue *nq; | |
1655 | int i; | |
1656 | ||
1657 | queue_for_each_hw_ctx(q, hctx, i) { | |
1658 | if (!hctx->nr_ctx || !hctx->tags) | |
1659 | continue; | |
1660 | nq = &nullb->queues[i]; | |
1661 | hctx->driver_data = nq; | |
1662 | null_init_queue(nullb, nq); | |
1663 | nullb->nr_queues++; | |
1664 | } | |
1665 | } | |
1666 | ||
f2298c04 JA |
1667 | static int setup_commands(struct nullb_queue *nq) |
1668 | { | |
1669 | struct nullb_cmd *cmd; | |
1670 | int i, tag_size; | |
1671 | ||
1672 | nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL); | |
1673 | if (!nq->cmds) | |
2d263a78 | 1674 | return -ENOMEM; |
f2298c04 JA |
1675 | |
1676 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
1677 | nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL); | |
1678 | if (!nq->tag_map) { | |
1679 | kfree(nq->cmds); | |
2d263a78 | 1680 | return -ENOMEM; |
f2298c04 JA |
1681 | } |
1682 | ||
1683 | for (i = 0; i < nq->queue_depth; i++) { | |
1684 | cmd = &nq->cmds[i]; | |
1685 | INIT_LIST_HEAD(&cmd->list); | |
1686 | cmd->ll_list.next = NULL; | |
1687 | cmd->tag = -1U; | |
1688 | } | |
1689 | ||
1690 | return 0; | |
1691 | } | |
1692 | ||
f2298c04 JA |
1693 | static int setup_queues(struct nullb *nullb) |
1694 | { | |
2984c868 SL |
1695 | nullb->queues = kzalloc(nullb->dev->submit_queues * |
1696 | sizeof(struct nullb_queue), GFP_KERNEL); | |
f2298c04 | 1697 | if (!nullb->queues) |
2d263a78 | 1698 | return -ENOMEM; |
f2298c04 JA |
1699 | |
1700 | nullb->nr_queues = 0; | |
2984c868 | 1701 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1702 | |
2d263a78 MB |
1703 | return 0; |
1704 | } | |
1705 | ||
1706 | static int init_driver_queues(struct nullb *nullb) | |
1707 | { | |
1708 | struct nullb_queue *nq; | |
1709 | int i, ret = 0; | |
f2298c04 | 1710 | |
2984c868 | 1711 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1712 | nq = &nullb->queues[i]; |
2d263a78 MB |
1713 | |
1714 | null_init_queue(nullb, nq); | |
1715 | ||
1716 | ret = setup_commands(nq); | |
1717 | if (ret) | |
31f9690e | 1718 | return ret; |
f2298c04 JA |
1719 | nullb->nr_queues++; |
1720 | } | |
2d263a78 | 1721 | return 0; |
f2298c04 JA |
1722 | } |
1723 | ||
9ae2d0aa | 1724 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
1725 | { |
1726 | struct gendisk *disk; | |
f2298c04 | 1727 | sector_t size; |
9ae2d0aa | 1728 | |
2984c868 | 1729 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1730 | if (!disk) |
1731 | return -ENOMEM; | |
2984c868 | 1732 | size = (sector_t)nullb->dev->size * 1024 * 1024ULL; |
9ae2d0aa MB |
1733 | set_capacity(disk, size >> 9); |
1734 | ||
1735 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1736 | disk->major = null_major; | |
1737 | disk->first_minor = nullb->index; | |
1738 | disk->fops = &null_fops; | |
1739 | disk->private_data = nullb; | |
1740 | disk->queue = nullb->q; | |
1741 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1742 | ||
1743 | add_disk(disk); | |
1744 | return 0; | |
1745 | } | |
1746 | ||
2984c868 | 1747 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1748 | { |
1749 | set->ops = &null_mq_ops; | |
2984c868 SL |
1750 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1751 | g_submit_queues; | |
1752 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1753 | g_hw_queue_depth; | |
1754 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1755 | set->cmd_size = sizeof(struct nullb_cmd); |
1756 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
1757 | set->driver_data = NULL; | |
1758 | ||
0d06a42f | 1759 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1760 | set->flags |= BLK_MQ_F_BLOCKING; |
1761 | ||
1762 | return blk_mq_alloc_tag_set(set); | |
1763 | } | |
1764 | ||
cedcafad SL |
1765 | static void null_validate_conf(struct nullb_device *dev) |
1766 | { | |
1767 | dev->blocksize = round_down(dev->blocksize, 512); | |
1768 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
1769 | if (dev->use_lightnvm && dev->blocksize != 4096) | |
1770 | dev->blocksize = 4096; | |
1771 | ||
1772 | if (dev->use_lightnvm && dev->queue_mode != NULL_Q_MQ) | |
1773 | dev->queue_mode = NULL_Q_MQ; | |
1774 | ||
1775 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1776 | if (dev->submit_queues != nr_online_nodes) | |
1777 | dev->submit_queues = nr_online_nodes; | |
1778 | } else if (dev->submit_queues > nr_cpu_ids) | |
1779 | dev->submit_queues = nr_cpu_ids; | |
1780 | else if (dev->submit_queues == 0) | |
1781 | dev->submit_queues = 1; | |
1782 | ||
1783 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1784 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1785 | |
1786 | /* Do memory allocation, so set blocking */ | |
1787 | if (dev->memory_backed) | |
1788 | dev->blocking = true; | |
deb78b41 SL |
1789 | else /* cache is meaningless */ |
1790 | dev->cache_size = 0; | |
1791 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1792 | dev->cache_size); | |
eff2c4f1 SL |
1793 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1794 | /* can not stop a queue */ | |
1795 | if (dev->queue_mode == NULL_Q_BIO) | |
1796 | dev->mbps = 0; | |
cedcafad SL |
1797 | } |
1798 | ||
2984c868 | 1799 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1800 | { |
1801 | struct nullb *nullb; | |
dc501dc0 | 1802 | int rv; |
f2298c04 | 1803 | |
cedcafad SL |
1804 | null_validate_conf(dev); |
1805 | ||
2984c868 | 1806 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1807 | if (!nullb) { |
1808 | rv = -ENOMEM; | |
24d2f903 | 1809 | goto out; |
dc501dc0 | 1810 | } |
2984c868 SL |
1811 | nullb->dev = dev; |
1812 | dev->nullb = nullb; | |
f2298c04 JA |
1813 | |
1814 | spin_lock_init(&nullb->lock); | |
1815 | ||
dc501dc0 RE |
1816 | rv = setup_queues(nullb); |
1817 | if (rv) | |
24d2f903 | 1818 | goto out_free_nullb; |
f2298c04 | 1819 | |
2984c868 | 1820 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1821 | if (shared_tags) { |
1822 | nullb->tag_set = &tag_set; | |
1823 | rv = 0; | |
1824 | } else { | |
1825 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1826 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1827 | } |
1828 | ||
dc501dc0 | 1829 | if (rv) |
24d2f903 CH |
1830 | goto out_cleanup_queues; |
1831 | ||
82f402fe | 1832 | nullb->q = blk_mq_init_queue(nullb->tag_set); |
35b489d3 | 1833 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1834 | rv = -ENOMEM; |
24d2f903 | 1835 | goto out_cleanup_tags; |
dc501dc0 | 1836 | } |
82f402fe | 1837 | null_init_queues(nullb); |
2984c868 SL |
1838 | } else if (dev->queue_mode == NULL_Q_BIO) { |
1839 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node); | |
dc501dc0 RE |
1840 | if (!nullb->q) { |
1841 | rv = -ENOMEM; | |
24d2f903 | 1842 | goto out_cleanup_queues; |
dc501dc0 | 1843 | } |
f2298c04 | 1844 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1845 | rv = init_driver_queues(nullb); |
1846 | if (rv) | |
1847 | goto out_cleanup_blk_queue; | |
f2298c04 | 1848 | } else { |
2984c868 SL |
1849 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, |
1850 | dev->home_node); | |
dc501dc0 RE |
1851 | if (!nullb->q) { |
1852 | rv = -ENOMEM; | |
24d2f903 | 1853 | goto out_cleanup_queues; |
dc501dc0 | 1854 | } |
f2298c04 | 1855 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 1856 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
31f9690e JK |
1857 | rv = init_driver_queues(nullb); |
1858 | if (rv) | |
1859 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1860 | } |
1861 | ||
eff2c4f1 SL |
1862 | if (dev->mbps) { |
1863 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1864 | nullb_setup_bwtimer(nullb); | |
1865 | } | |
1866 | ||
deb78b41 SL |
1867 | if (dev->cache_size > 0) { |
1868 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1869 | blk_queue_write_cache(nullb->q, true, true); | |
1870 | blk_queue_flush_queueable(nullb->q, true); | |
1871 | } | |
1872 | ||
f2298c04 JA |
1873 | nullb->q->queuedata = nullb; |
1874 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); | |
b277da0a | 1875 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
f2298c04 | 1876 | |
f2298c04 | 1877 | mutex_lock(&lock); |
94bc02e3 | 1878 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1879 | dev->index = nullb->index; |
f2298c04 JA |
1880 | mutex_unlock(&lock); |
1881 | ||
2984c868 SL |
1882 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1883 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1884 | |
306eb6b4 | 1885 | null_config_discard(nullb); |
f2298c04 | 1886 | |
b2b7e001 MB |
1887 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1888 | ||
2984c868 | 1889 | if (dev->use_lightnvm) |
9ae2d0aa MB |
1890 | rv = null_nvm_register(nullb); |
1891 | else | |
1892 | rv = null_gendisk_register(nullb); | |
b2b7e001 | 1893 | |
9ae2d0aa MB |
1894 | if (rv) |
1895 | goto out_cleanup_blk_queue; | |
a514379b MB |
1896 | |
1897 | mutex_lock(&lock); | |
1898 | list_add_tail(&nullb->list, &nullb_list); | |
1899 | mutex_unlock(&lock); | |
3681c85d | 1900 | |
f2298c04 | 1901 | return 0; |
24d2f903 CH |
1902 | out_cleanup_blk_queue: |
1903 | blk_cleanup_queue(nullb->q); | |
1904 | out_cleanup_tags: | |
2984c868 | 1905 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1906 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1907 | out_cleanup_queues: |
1908 | cleanup_queues(nullb); | |
1909 | out_free_nullb: | |
1910 | kfree(nullb); | |
1911 | out: | |
dc501dc0 | 1912 | return rv; |
f2298c04 JA |
1913 | } |
1914 | ||
1915 | static int __init null_init(void) | |
1916 | { | |
af096e22 | 1917 | int ret = 0; |
f2298c04 | 1918 | unsigned int i; |
af096e22 | 1919 | struct nullb *nullb; |
2984c868 | 1920 | struct nullb_device *dev; |
f2298c04 | 1921 | |
deb78b41 SL |
1922 | /* check for nullb_page.bitmap */ |
1923 | if (sizeof(unsigned long) * 8 - 2 < (PAGE_SIZE >> SECTOR_SHIFT)) | |
1924 | return -EINVAL; | |
f2298c04 | 1925 | |
2984c868 | 1926 | if (g_bs > PAGE_SIZE) { |
9967d8ac R |
1927 | pr_warn("null_blk: invalid block size\n"); |
1928 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1929 | g_bs = PAGE_SIZE; |
9967d8ac | 1930 | } |
f2298c04 | 1931 | |
2984c868 | 1932 | if (g_use_lightnvm && g_bs != 4096) { |
6bb9535b MB |
1933 | pr_warn("null_blk: LightNVM only supports 4k block size\n"); |
1934 | pr_warn("null_blk: defaults block size to 4k\n"); | |
2984c868 | 1935 | g_bs = 4096; |
6bb9535b MB |
1936 | } |
1937 | ||
2984c868 | 1938 | if (g_use_lightnvm && g_queue_mode != NULL_Q_MQ) { |
b2b7e001 MB |
1939 | pr_warn("null_blk: LightNVM only supported for blk-mq\n"); |
1940 | pr_warn("null_blk: defaults queue mode to blk-mq\n"); | |
2984c868 | 1941 | g_queue_mode = NULL_Q_MQ; |
b2b7e001 MB |
1942 | } |
1943 | ||
2984c868 SL |
1944 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1945 | if (g_submit_queues != nr_online_nodes) { | |
558ab300 | 1946 | pr_warn("null_blk: submit_queues param is set to %u.\n", |
d15ee6b1 | 1947 | nr_online_nodes); |
2984c868 | 1948 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1949 | } |
2984c868 SL |
1950 | } else if (g_submit_queues > nr_cpu_ids) |
1951 | g_submit_queues = nr_cpu_ids; | |
1952 | else if (g_submit_queues <= 0) | |
1953 | g_submit_queues = 1; | |
f2298c04 | 1954 | |
2984c868 SL |
1955 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1956 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1957 | if (ret) |
1958 | return ret; | |
1959 | } | |
1960 | ||
3bf2bd20 SL |
1961 | config_group_init(&nullb_subsys.su_group); |
1962 | mutex_init(&nullb_subsys.su_mutex); | |
1963 | ||
1964 | ret = configfs_register_subsystem(&nullb_subsys); | |
1965 | if (ret) | |
1966 | goto err_tagset; | |
1967 | ||
f2298c04 JA |
1968 | mutex_init(&lock); |
1969 | ||
f2298c04 | 1970 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1971 | if (null_major < 0) { |
1972 | ret = null_major; | |
3bf2bd20 | 1973 | goto err_conf; |
db2d153d | 1974 | } |
f2298c04 | 1975 | |
2984c868 | 1976 | if (g_use_lightnvm) { |
6bb9535b MB |
1977 | ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64), |
1978 | 0, 0, NULL); | |
1979 | if (!ppa_cache) { | |
1980 | pr_err("null_blk: unable to create ppa cache\n"); | |
af096e22 MH |
1981 | ret = -ENOMEM; |
1982 | goto err_ppa; | |
6bb9535b MB |
1983 | } |
1984 | } | |
1985 | ||
f2298c04 | 1986 | for (i = 0; i < nr_devices; i++) { |
2984c868 SL |
1987 | dev = null_alloc_dev(); |
1988 | if (!dev) | |
1989 | goto err_dev; | |
1990 | ret = null_add_dev(dev); | |
1991 | if (ret) { | |
1992 | null_free_dev(dev); | |
af096e22 | 1993 | goto err_dev; |
2984c868 | 1994 | } |
f2298c04 JA |
1995 | } |
1996 | ||
1997 | pr_info("null: module loaded\n"); | |
1998 | return 0; | |
af096e22 MH |
1999 | |
2000 | err_dev: | |
2001 | while (!list_empty(&nullb_list)) { | |
2002 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 2003 | dev = nullb->dev; |
af096e22 | 2004 | null_del_dev(nullb); |
2984c868 | 2005 | null_free_dev(dev); |
af096e22 | 2006 | } |
6bb9535b | 2007 | kmem_cache_destroy(ppa_cache); |
af096e22 MH |
2008 | err_ppa: |
2009 | unregister_blkdev(null_major, "nullb"); | |
3bf2bd20 SL |
2010 | err_conf: |
2011 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 2012 | err_tagset: |
2984c868 | 2013 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 2014 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 2015 | return ret; |
f2298c04 JA |
2016 | } |
2017 | ||
2018 | static void __exit null_exit(void) | |
2019 | { | |
2020 | struct nullb *nullb; | |
2021 | ||
3bf2bd20 SL |
2022 | configfs_unregister_subsystem(&nullb_subsys); |
2023 | ||
f2298c04 JA |
2024 | unregister_blkdev(null_major, "nullb"); |
2025 | ||
2026 | mutex_lock(&lock); | |
2027 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
2028 | struct nullb_device *dev; |
2029 | ||
f2298c04 | 2030 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 2031 | dev = nullb->dev; |
f2298c04 | 2032 | null_del_dev(nullb); |
2984c868 | 2033 | null_free_dev(dev); |
f2298c04 JA |
2034 | } |
2035 | mutex_unlock(&lock); | |
6bb9535b | 2036 | |
2984c868 | 2037 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe JA |
2038 | blk_mq_free_tag_set(&tag_set); |
2039 | ||
6bb9535b | 2040 | kmem_cache_destroy(ppa_cache); |
f2298c04 JA |
2041 | } |
2042 | ||
2043 | module_init(null_init); | |
2044 | module_exit(null_exit); | |
2045 | ||
231b3db1 | 2046 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 2047 | MODULE_LICENSE("GPL"); |