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> | |
f2298c04 | 10 | #include <linux/init.h> |
6dad38d3 | 11 | #include "null_blk.h" |
f2298c04 | 12 | |
5bcd0e0c SL |
13 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) |
14 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) | |
5bcd0e0c SL |
15 | #define SECTOR_MASK (PAGE_SECTORS - 1) |
16 | ||
17 | #define FREE_BATCH 16 | |
18 | ||
eff2c4f1 SL |
19 | #define TICKS_PER_SEC 50ULL |
20 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
21 | ||
33f782c4 | 22 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 23 | static DECLARE_FAULT_ATTR(null_timeout_attr); |
24941b90 | 24 | static DECLARE_FAULT_ATTR(null_requeue_attr); |
33f782c4 | 25 | #endif |
93b57046 | 26 | |
eff2c4f1 SL |
27 | static inline u64 mb_per_tick(int mbps) |
28 | { | |
29 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
30 | } | |
f2298c04 | 31 | |
3bf2bd20 SL |
32 | /* |
33 | * Status flags for nullb_device. | |
34 | * | |
35 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
36 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 37 | * THROTTLED: Device is being throttled. |
deb78b41 | 38 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
39 | */ |
40 | enum nullb_device_flags { | |
41 | NULLB_DEV_FL_CONFIGURED = 0, | |
42 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 43 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 44 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
45 | }; |
46 | ||
66231ad3 | 47 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
48 | /* |
49 | * nullb_page is a page in memory for nullb devices. | |
50 | * | |
51 | * @page: The page holding the data. | |
52 | * @bitmap: The bitmap represents which sector in the page has data. | |
53 | * Each bit represents one block size. For example, sector 8 | |
54 | * will use the 7th bit | |
deb78b41 SL |
55 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
56 | * page is being flushing to storage. FREE means the cache page is freed and | |
57 | * should be skipped from flushing to storage. Please see | |
58 | * null_make_cache_space | |
5bcd0e0c SL |
59 | */ |
60 | struct nullb_page { | |
61 | struct page *page; | |
66231ad3 | 62 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 63 | }; |
66231ad3 ML |
64 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
65 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 66 | |
f2298c04 JA |
67 | static LIST_HEAD(nullb_list); |
68 | static struct mutex lock; | |
69 | static int null_major; | |
94bc02e3 | 70 | static DEFINE_IDA(nullb_indexes); |
82f402fe | 71 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 72 | |
f2298c04 JA |
73 | enum { |
74 | NULL_IRQ_NONE = 0, | |
75 | NULL_IRQ_SOFTIRQ = 1, | |
76 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 77 | }; |
f2298c04 | 78 | |
ce2c350b | 79 | enum { |
f2298c04 JA |
80 | NULL_Q_BIO = 0, |
81 | NULL_Q_RQ = 1, | |
82 | NULL_Q_MQ = 2, | |
83 | }; | |
84 | ||
b3cffc38 | 85 | static int g_no_sched; |
5657a819 | 86 | module_param_named(no_sched, g_no_sched, int, 0444); |
b3cffc38 | 87 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
88 | ||
2984c868 | 89 | static int g_submit_queues = 1; |
5657a819 | 90 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
f2298c04 JA |
91 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
92 | ||
2984c868 | 93 | static int g_home_node = NUMA_NO_NODE; |
5657a819 | 94 | module_param_named(home_node, g_home_node, int, 0444); |
f2298c04 JA |
95 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
96 | ||
33f782c4 | 97 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 98 | static char g_timeout_str[80]; |
5657a819 | 99 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
24941b90 JA |
100 | |
101 | static char g_requeue_str[80]; | |
5657a819 | 102 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
33f782c4 | 103 | #endif |
93b57046 | 104 | |
2984c868 | 105 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
106 | |
107 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
108 | { | |
109 | int ret, new_val; | |
110 | ||
111 | ret = kstrtoint(str, 10, &new_val); | |
112 | if (ret) | |
113 | return -EINVAL; | |
114 | ||
115 | if (new_val < min || new_val > max) | |
116 | return -EINVAL; | |
117 | ||
118 | *val = new_val; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
123 | { | |
2984c868 | 124 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
125 | } |
126 | ||
9c27847d | 127 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
128 | .set = null_set_queue_mode, |
129 | .get = param_get_int, | |
130 | }; | |
131 | ||
5657a819 | 132 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
54ae81cd | 133 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 134 | |
2984c868 | 135 | static int g_gb = 250; |
5657a819 | 136 | module_param_named(gb, g_gb, int, 0444); |
f2298c04 JA |
137 | MODULE_PARM_DESC(gb, "Size in GB"); |
138 | ||
2984c868 | 139 | static int g_bs = 512; |
5657a819 | 140 | module_param_named(bs, g_bs, int, 0444); |
f2298c04 JA |
141 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
142 | ||
82f402fe | 143 | static int nr_devices = 1; |
5657a819 | 144 | module_param(nr_devices, int, 0444); |
f2298c04 JA |
145 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
146 | ||
2984c868 | 147 | static bool g_blocking; |
5657a819 | 148 | module_param_named(blocking, g_blocking, bool, 0444); |
db5bcf87 JA |
149 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
150 | ||
82f402fe | 151 | static bool shared_tags; |
5657a819 | 152 | module_param(shared_tags, bool, 0444); |
82f402fe JA |
153 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
154 | ||
2984c868 | 155 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
156 | |
157 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
158 | { | |
2984c868 | 159 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
160 | NULL_IRQ_TIMER); |
161 | } | |
162 | ||
9c27847d | 163 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
164 | .set = null_set_irqmode, |
165 | .get = param_get_int, | |
166 | }; | |
167 | ||
5657a819 | 168 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
f2298c04 JA |
169 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
170 | ||
2984c868 | 171 | static unsigned long g_completion_nsec = 10000; |
5657a819 | 172 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
f2298c04 JA |
173 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
174 | ||
2984c868 | 175 | static int g_hw_queue_depth = 64; |
5657a819 | 176 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
f2298c04 JA |
177 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
178 | ||
2984c868 | 179 | static bool g_use_per_node_hctx; |
5657a819 | 180 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
20005244 | 181 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 182 | |
3bf2bd20 SL |
183 | static struct nullb_device *null_alloc_dev(void); |
184 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
185 | static void null_del_dev(struct nullb *nullb); |
186 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 187 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
188 | |
189 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
190 | { | |
191 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
192 | } | |
193 | ||
194 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
195 | { | |
196 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
197 | } | |
198 | ||
199 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
200 | char *page) | |
201 | { | |
202 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
203 | } | |
204 | ||
205 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
206 | { | |
207 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
208 | } | |
209 | ||
210 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
211 | const char *page, size_t count) | |
212 | { | |
213 | unsigned int tmp; | |
214 | int result; | |
215 | ||
216 | result = kstrtouint(page, 0, &tmp); | |
217 | if (result) | |
218 | return result; | |
219 | ||
220 | *val = tmp; | |
221 | return count; | |
222 | } | |
223 | ||
224 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
225 | const char *page, size_t count) | |
226 | { | |
227 | int result; | |
228 | unsigned long tmp; | |
229 | ||
230 | result = kstrtoul(page, 0, &tmp); | |
231 | if (result) | |
232 | return result; | |
233 | ||
234 | *val = tmp; | |
235 | return count; | |
236 | } | |
237 | ||
238 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
239 | size_t count) | |
240 | { | |
241 | bool tmp; | |
242 | int result; | |
243 | ||
244 | result = kstrtobool(page, &tmp); | |
245 | if (result) | |
246 | return result; | |
247 | ||
248 | *val = tmp; | |
249 | return count; | |
250 | } | |
251 | ||
252 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
253 | #define NULLB_DEVICE_ATTR(NAME, TYPE) \ | |
254 | static ssize_t \ | |
255 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
256 | { \ | |
257 | return nullb_device_##TYPE##_attr_show( \ | |
258 | to_nullb_device(item)->NAME, page); \ | |
259 | } \ | |
260 | static ssize_t \ | |
261 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
262 | size_t count) \ | |
263 | { \ | |
264 | if (test_bit(NULLB_DEV_FL_CONFIGURED, &to_nullb_device(item)->flags)) \ | |
265 | return -EBUSY; \ | |
266 | return nullb_device_##TYPE##_attr_store( \ | |
267 | &to_nullb_device(item)->NAME, page, count); \ | |
268 | } \ | |
269 | CONFIGFS_ATTR(nullb_device_, NAME); | |
270 | ||
271 | NULLB_DEVICE_ATTR(size, ulong); | |
272 | NULLB_DEVICE_ATTR(completion_nsec, ulong); | |
273 | NULLB_DEVICE_ATTR(submit_queues, uint); | |
274 | NULLB_DEVICE_ATTR(home_node, uint); | |
275 | NULLB_DEVICE_ATTR(queue_mode, uint); | |
276 | NULLB_DEVICE_ATTR(blocksize, uint); | |
277 | NULLB_DEVICE_ATTR(irqmode, uint); | |
278 | NULLB_DEVICE_ATTR(hw_queue_depth, uint); | |
cedcafad | 279 | NULLB_DEVICE_ATTR(index, uint); |
3bf2bd20 SL |
280 | NULLB_DEVICE_ATTR(blocking, bool); |
281 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool); | |
5bcd0e0c | 282 | NULLB_DEVICE_ATTR(memory_backed, bool); |
306eb6b4 | 283 | NULLB_DEVICE_ATTR(discard, bool); |
eff2c4f1 | 284 | NULLB_DEVICE_ATTR(mbps, uint); |
deb78b41 | 285 | NULLB_DEVICE_ATTR(cache_size, ulong); |
3bf2bd20 | 286 | |
cedcafad SL |
287 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
288 | { | |
289 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
290 | } | |
291 | ||
292 | static ssize_t nullb_device_power_store(struct config_item *item, | |
293 | const char *page, size_t count) | |
294 | { | |
295 | struct nullb_device *dev = to_nullb_device(item); | |
296 | bool newp = false; | |
297 | ssize_t ret; | |
298 | ||
299 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
300 | if (ret < 0) | |
301 | return ret; | |
302 | ||
303 | if (!dev->power && newp) { | |
304 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
305 | return count; | |
306 | if (null_add_dev(dev)) { | |
307 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
308 | return -ENOMEM; | |
309 | } | |
310 | ||
311 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
312 | dev->power = newp; | |
b3c30512 | 313 | } else if (dev->power && !newp) { |
cedcafad SL |
314 | mutex_lock(&lock); |
315 | dev->power = newp; | |
316 | null_del_dev(dev->nullb); | |
317 | mutex_unlock(&lock); | |
318 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
00a8cdb8 | 319 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
320 | } |
321 | ||
322 | return count; | |
323 | } | |
324 | ||
325 | CONFIGFS_ATTR(nullb_device_, power); | |
326 | ||
2f54a613 SL |
327 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
328 | { | |
329 | struct nullb_device *t_dev = to_nullb_device(item); | |
330 | ||
331 | return badblocks_show(&t_dev->badblocks, page, 0); | |
332 | } | |
333 | ||
334 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
335 | const char *page, size_t count) | |
336 | { | |
337 | struct nullb_device *t_dev = to_nullb_device(item); | |
338 | char *orig, *buf, *tmp; | |
339 | u64 start, end; | |
340 | int ret; | |
341 | ||
342 | orig = kstrndup(page, count, GFP_KERNEL); | |
343 | if (!orig) | |
344 | return -ENOMEM; | |
345 | ||
346 | buf = strstrip(orig); | |
347 | ||
348 | ret = -EINVAL; | |
349 | if (buf[0] != '+' && buf[0] != '-') | |
350 | goto out; | |
351 | tmp = strchr(&buf[1], '-'); | |
352 | if (!tmp) | |
353 | goto out; | |
354 | *tmp = '\0'; | |
355 | ret = kstrtoull(buf + 1, 0, &start); | |
356 | if (ret) | |
357 | goto out; | |
358 | ret = kstrtoull(tmp + 1, 0, &end); | |
359 | if (ret) | |
360 | goto out; | |
361 | ret = -EINVAL; | |
362 | if (start > end) | |
363 | goto out; | |
364 | /* enable badblocks */ | |
365 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
366 | if (buf[0] == '+') | |
367 | ret = badblocks_set(&t_dev->badblocks, start, | |
368 | end - start + 1, 1); | |
369 | else | |
370 | ret = badblocks_clear(&t_dev->badblocks, start, | |
371 | end - start + 1); | |
372 | if (ret == 0) | |
373 | ret = count; | |
374 | out: | |
375 | kfree(orig); | |
376 | return ret; | |
377 | } | |
378 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
379 | ||
3bf2bd20 SL |
380 | static struct configfs_attribute *nullb_device_attrs[] = { |
381 | &nullb_device_attr_size, | |
382 | &nullb_device_attr_completion_nsec, | |
383 | &nullb_device_attr_submit_queues, | |
384 | &nullb_device_attr_home_node, | |
385 | &nullb_device_attr_queue_mode, | |
386 | &nullb_device_attr_blocksize, | |
387 | &nullb_device_attr_irqmode, | |
388 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 389 | &nullb_device_attr_index, |
3bf2bd20 SL |
390 | &nullb_device_attr_blocking, |
391 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 392 | &nullb_device_attr_power, |
5bcd0e0c | 393 | &nullb_device_attr_memory_backed, |
306eb6b4 | 394 | &nullb_device_attr_discard, |
eff2c4f1 | 395 | &nullb_device_attr_mbps, |
deb78b41 | 396 | &nullb_device_attr_cache_size, |
2f54a613 | 397 | &nullb_device_attr_badblocks, |
3bf2bd20 SL |
398 | NULL, |
399 | }; | |
400 | ||
401 | static void nullb_device_release(struct config_item *item) | |
402 | { | |
5bcd0e0c SL |
403 | struct nullb_device *dev = to_nullb_device(item); |
404 | ||
deb78b41 | 405 | null_free_device_storage(dev, false); |
5bcd0e0c | 406 | null_free_dev(dev); |
3bf2bd20 SL |
407 | } |
408 | ||
409 | static struct configfs_item_operations nullb_device_ops = { | |
410 | .release = nullb_device_release, | |
411 | }; | |
412 | ||
e1919dff | 413 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
414 | .ct_item_ops = &nullb_device_ops, |
415 | .ct_attrs = nullb_device_attrs, | |
416 | .ct_owner = THIS_MODULE, | |
417 | }; | |
418 | ||
419 | static struct | |
420 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
421 | { | |
422 | struct nullb_device *dev; | |
423 | ||
424 | dev = null_alloc_dev(); | |
425 | if (!dev) | |
426 | return ERR_PTR(-ENOMEM); | |
427 | ||
428 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
429 | ||
430 | return &dev->item; | |
431 | } | |
432 | ||
433 | static void | |
434 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
435 | { | |
cedcafad SL |
436 | struct nullb_device *dev = to_nullb_device(item); |
437 | ||
438 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
439 | mutex_lock(&lock); | |
440 | dev->power = false; | |
441 | null_del_dev(dev->nullb); | |
442 | mutex_unlock(&lock); | |
443 | } | |
444 | ||
3bf2bd20 SL |
445 | config_item_put(item); |
446 | } | |
447 | ||
448 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
449 | { | |
2f54a613 | 450 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks\n"); |
3bf2bd20 SL |
451 | } |
452 | ||
453 | CONFIGFS_ATTR_RO(memb_group_, features); | |
454 | ||
455 | static struct configfs_attribute *nullb_group_attrs[] = { | |
456 | &memb_group_attr_features, | |
457 | NULL, | |
458 | }; | |
459 | ||
460 | static struct configfs_group_operations nullb_group_ops = { | |
461 | .make_item = nullb_group_make_item, | |
462 | .drop_item = nullb_group_drop_item, | |
463 | }; | |
464 | ||
e1919dff | 465 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
466 | .ct_group_ops = &nullb_group_ops, |
467 | .ct_attrs = nullb_group_attrs, | |
468 | .ct_owner = THIS_MODULE, | |
469 | }; | |
470 | ||
471 | static struct configfs_subsystem nullb_subsys = { | |
472 | .su_group = { | |
473 | .cg_item = { | |
474 | .ci_namebuf = "nullb", | |
475 | .ci_type = &nullb_group_type, | |
476 | }, | |
477 | }, | |
478 | }; | |
479 | ||
deb78b41 SL |
480 | static inline int null_cache_active(struct nullb *nullb) |
481 | { | |
482 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
483 | } | |
484 | ||
2984c868 SL |
485 | static struct nullb_device *null_alloc_dev(void) |
486 | { | |
487 | struct nullb_device *dev; | |
488 | ||
489 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
490 | if (!dev) | |
491 | return NULL; | |
5bcd0e0c | 492 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 493 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
494 | if (badblocks_init(&dev->badblocks, 0)) { |
495 | kfree(dev); | |
496 | return NULL; | |
497 | } | |
498 | ||
2984c868 SL |
499 | dev->size = g_gb * 1024; |
500 | dev->completion_nsec = g_completion_nsec; | |
501 | dev->submit_queues = g_submit_queues; | |
502 | dev->home_node = g_home_node; | |
503 | dev->queue_mode = g_queue_mode; | |
504 | dev->blocksize = g_bs; | |
505 | dev->irqmode = g_irqmode; | |
506 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 SL |
507 | dev->blocking = g_blocking; |
508 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
509 | return dev; | |
510 | } | |
511 | ||
512 | static void null_free_dev(struct nullb_device *dev) | |
513 | { | |
1addb798 DD |
514 | if (!dev) |
515 | return; | |
516 | ||
517 | badblocks_exit(&dev->badblocks); | |
2984c868 SL |
518 | kfree(dev); |
519 | } | |
520 | ||
f2298c04 JA |
521 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
522 | { | |
523 | clear_bit_unlock(tag, nq->tag_map); | |
524 | ||
525 | if (waitqueue_active(&nq->wait)) | |
526 | wake_up(&nq->wait); | |
527 | } | |
528 | ||
529 | static unsigned int get_tag(struct nullb_queue *nq) | |
530 | { | |
531 | unsigned int tag; | |
532 | ||
533 | do { | |
534 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
535 | if (tag >= nq->queue_depth) | |
536 | return -1U; | |
537 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
538 | ||
539 | return tag; | |
540 | } | |
541 | ||
542 | static void free_cmd(struct nullb_cmd *cmd) | |
543 | { | |
544 | put_tag(cmd->nq, cmd->tag); | |
545 | } | |
546 | ||
3c395a96 PV |
547 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
548 | ||
f2298c04 JA |
549 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
550 | { | |
551 | struct nullb_cmd *cmd; | |
552 | unsigned int tag; | |
553 | ||
554 | tag = get_tag(nq); | |
555 | if (tag != -1U) { | |
556 | cmd = &nq->cmds[tag]; | |
557 | cmd->tag = tag; | |
558 | cmd->nq = nq; | |
2984c868 | 559 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
560 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
561 | HRTIMER_MODE_REL); | |
562 | cmd->timer.function = null_cmd_timer_expired; | |
563 | } | |
f2298c04 JA |
564 | return cmd; |
565 | } | |
566 | ||
567 | return NULL; | |
568 | } | |
569 | ||
570 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
571 | { | |
572 | struct nullb_cmd *cmd; | |
573 | DEFINE_WAIT(wait); | |
574 | ||
575 | cmd = __alloc_cmd(nq); | |
576 | if (cmd || !can_wait) | |
577 | return cmd; | |
578 | ||
579 | do { | |
580 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
581 | cmd = __alloc_cmd(nq); | |
582 | if (cmd) | |
583 | break; | |
584 | ||
585 | io_schedule(); | |
586 | } while (1); | |
587 | ||
588 | finish_wait(&nq->wait, &wait); | |
589 | return cmd; | |
590 | } | |
591 | ||
592 | static void end_cmd(struct nullb_cmd *cmd) | |
593 | { | |
cf8ecc5a | 594 | struct request_queue *q = NULL; |
2984c868 | 595 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 596 | |
e8271201 MK |
597 | if (cmd->rq) |
598 | q = cmd->rq->q; | |
599 | ||
ce2c350b CH |
600 | switch (queue_mode) { |
601 | case NULL_Q_MQ: | |
5bcd0e0c | 602 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b CH |
603 | return; |
604 | case NULL_Q_RQ: | |
605 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
5bcd0e0c | 606 | blk_end_request_all(cmd->rq, cmd->error); |
ce2c350b CH |
607 | break; |
608 | case NULL_Q_BIO: | |
5bcd0e0c | 609 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 610 | bio_endio(cmd->bio); |
48cc661e | 611 | break; |
ce2c350b | 612 | } |
f2298c04 | 613 | |
48cc661e JA |
614 | free_cmd(cmd); |
615 | ||
cf8ecc5a | 616 | /* Restart queue if needed, as we are freeing a tag */ |
48cc661e | 617 | if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) { |
cf8ecc5a AA |
618 | unsigned long flags; |
619 | ||
620 | spin_lock_irqsave(q->queue_lock, flags); | |
48cc661e | 621 | blk_start_queue_async(q); |
cf8ecc5a | 622 | spin_unlock_irqrestore(q->queue_lock, flags); |
f2298c04 | 623 | } |
cf8ecc5a AA |
624 | } |
625 | ||
626 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
627 | { | |
628 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
629 | |
630 | return HRTIMER_NORESTART; | |
631 | } | |
632 | ||
633 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
634 | { | |
2984c868 | 635 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 636 | |
3c395a96 | 637 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
638 | } |
639 | ||
640 | static void null_softirq_done_fn(struct request *rq) | |
641 | { | |
2984c868 SL |
642 | struct nullb *nullb = rq->q->queuedata; |
643 | ||
644 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
d891fa70 JA |
645 | end_cmd(blk_mq_rq_to_pdu(rq)); |
646 | else | |
647 | end_cmd(rq->special); | |
f2298c04 JA |
648 | } |
649 | ||
5bcd0e0c SL |
650 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
651 | { | |
652 | struct nullb_page *t_page; | |
653 | ||
654 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
655 | if (!t_page) | |
656 | goto out; | |
657 | ||
658 | t_page->page = alloc_pages(gfp_flags, 0); | |
659 | if (!t_page->page) | |
660 | goto out_freepage; | |
661 | ||
66231ad3 | 662 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
663 | return t_page; |
664 | out_freepage: | |
665 | kfree(t_page); | |
666 | out: | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | static void null_free_page(struct nullb_page *t_page) | |
671 | { | |
66231ad3 ML |
672 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
673 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 674 | return; |
5bcd0e0c SL |
675 | __free_page(t_page->page); |
676 | kfree(t_page); | |
677 | } | |
678 | ||
66231ad3 ML |
679 | static bool null_page_empty(struct nullb_page *page) |
680 | { | |
681 | int size = MAP_SZ - 2; | |
682 | ||
683 | return find_first_bit(page->bitmap, size) == size; | |
684 | } | |
685 | ||
deb78b41 SL |
686 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
687 | bool is_cache) | |
5bcd0e0c SL |
688 | { |
689 | unsigned int sector_bit; | |
690 | u64 idx; | |
691 | struct nullb_page *t_page, *ret; | |
692 | struct radix_tree_root *root; | |
693 | ||
deb78b41 | 694 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
695 | idx = sector >> PAGE_SECTORS_SHIFT; |
696 | sector_bit = (sector & SECTOR_MASK); | |
697 | ||
698 | t_page = radix_tree_lookup(root, idx); | |
699 | if (t_page) { | |
66231ad3 | 700 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 701 | |
66231ad3 | 702 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
703 | ret = radix_tree_delete_item(root, idx, t_page); |
704 | WARN_ON(ret != t_page); | |
705 | null_free_page(ret); | |
deb78b41 SL |
706 | if (is_cache) |
707 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
708 | } |
709 | } | |
710 | } | |
711 | ||
712 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 713 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
714 | { |
715 | struct radix_tree_root *root; | |
716 | ||
deb78b41 | 717 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
718 | |
719 | if (radix_tree_insert(root, idx, t_page)) { | |
720 | null_free_page(t_page); | |
721 | t_page = radix_tree_lookup(root, idx); | |
722 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
723 | } else if (is_cache) |
724 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
725 | |
726 | return t_page; | |
727 | } | |
728 | ||
deb78b41 | 729 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
730 | { |
731 | unsigned long pos = 0; | |
732 | int nr_pages; | |
733 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
734 | struct radix_tree_root *root; | |
735 | ||
deb78b41 | 736 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
737 | |
738 | do { | |
739 | int i; | |
740 | ||
741 | nr_pages = radix_tree_gang_lookup(root, | |
742 | (void **)t_pages, pos, FREE_BATCH); | |
743 | ||
744 | for (i = 0; i < nr_pages; i++) { | |
745 | pos = t_pages[i]->page->index; | |
746 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
747 | WARN_ON(ret != t_pages[i]); | |
748 | null_free_page(ret); | |
749 | } | |
750 | ||
751 | pos++; | |
752 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
753 | |
754 | if (is_cache) | |
755 | dev->curr_cache = 0; | |
5bcd0e0c SL |
756 | } |
757 | ||
deb78b41 SL |
758 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
759 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
760 | { |
761 | unsigned int sector_bit; | |
762 | u64 idx; | |
763 | struct nullb_page *t_page; | |
deb78b41 | 764 | struct radix_tree_root *root; |
5bcd0e0c SL |
765 | |
766 | idx = sector >> PAGE_SECTORS_SHIFT; | |
767 | sector_bit = (sector & SECTOR_MASK); | |
768 | ||
deb78b41 SL |
769 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
770 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
771 | WARN_ON(t_page && t_page->page->index != idx); |
772 | ||
66231ad3 | 773 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
774 | return t_page; |
775 | ||
776 | return NULL; | |
777 | } | |
778 | ||
deb78b41 SL |
779 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
780 | sector_t sector, bool for_write, bool ignore_cache) | |
781 | { | |
782 | struct nullb_page *page = NULL; | |
783 | ||
784 | if (!ignore_cache) | |
785 | page = __null_lookup_page(nullb, sector, for_write, true); | |
786 | if (page) | |
787 | return page; | |
788 | return __null_lookup_page(nullb, sector, for_write, false); | |
789 | } | |
790 | ||
5bcd0e0c | 791 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
deb78b41 | 792 | sector_t sector, bool ignore_cache) |
5bcd0e0c SL |
793 | { |
794 | u64 idx; | |
795 | struct nullb_page *t_page; | |
796 | ||
deb78b41 | 797 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
798 | if (t_page) |
799 | return t_page; | |
800 | ||
801 | spin_unlock_irq(&nullb->lock); | |
802 | ||
803 | t_page = null_alloc_page(GFP_NOIO); | |
804 | if (!t_page) | |
805 | goto out_lock; | |
806 | ||
807 | if (radix_tree_preload(GFP_NOIO)) | |
808 | goto out_freepage; | |
809 | ||
810 | spin_lock_irq(&nullb->lock); | |
811 | idx = sector >> PAGE_SECTORS_SHIFT; | |
812 | t_page->page->index = idx; | |
deb78b41 | 813 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
814 | radix_tree_preload_end(); |
815 | ||
816 | return t_page; | |
817 | out_freepage: | |
818 | null_free_page(t_page); | |
819 | out_lock: | |
820 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
821 | return null_lookup_page(nullb, sector, true, ignore_cache); |
822 | } | |
823 | ||
824 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
825 | { | |
826 | int i; | |
827 | unsigned int offset; | |
828 | u64 idx; | |
829 | struct nullb_page *t_page, *ret; | |
830 | void *dst, *src; | |
831 | ||
832 | idx = c_page->page->index; | |
833 | ||
834 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
835 | ||
66231ad3 ML |
836 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
837 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 838 | null_free_page(c_page); |
66231ad3 | 839 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
840 | ret = radix_tree_delete_item(&nullb->dev->data, |
841 | idx, t_page); | |
842 | null_free_page(t_page); | |
843 | } | |
844 | return 0; | |
845 | } | |
846 | ||
847 | if (!t_page) | |
848 | return -ENOMEM; | |
849 | ||
850 | src = kmap_atomic(c_page->page); | |
851 | dst = kmap_atomic(t_page->page); | |
852 | ||
853 | for (i = 0; i < PAGE_SECTORS; | |
854 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 855 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
856 | offset = (i << SECTOR_SHIFT); |
857 | memcpy(dst + offset, src + offset, | |
858 | nullb->dev->blocksize); | |
66231ad3 | 859 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
860 | } |
861 | } | |
862 | ||
863 | kunmap_atomic(dst); | |
864 | kunmap_atomic(src); | |
865 | ||
866 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
867 | null_free_page(ret); | |
868 | nullb->dev->curr_cache -= PAGE_SIZE; | |
869 | ||
870 | return 0; | |
871 | } | |
872 | ||
873 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 874 | { |
deb78b41 SL |
875 | int i, err, nr_pages; |
876 | struct nullb_page *c_pages[FREE_BATCH]; | |
877 | unsigned long flushed = 0, one_round; | |
878 | ||
879 | again: | |
880 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
881 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
882 | return 0; | |
883 | ||
884 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
885 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
886 | /* | |
887 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
888 | * avoid race, we don't allow page free | |
889 | */ | |
890 | for (i = 0; i < nr_pages; i++) { | |
891 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
892 | /* | |
893 | * We found the page which is being flushed to disk by other | |
894 | * threads | |
895 | */ | |
66231ad3 | 896 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
897 | c_pages[i] = NULL; |
898 | else | |
66231ad3 | 899 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
900 | } |
901 | ||
902 | one_round = 0; | |
903 | for (i = 0; i < nr_pages; i++) { | |
904 | if (c_pages[i] == NULL) | |
905 | continue; | |
906 | err = null_flush_cache_page(nullb, c_pages[i]); | |
907 | if (err) | |
908 | return err; | |
909 | one_round++; | |
910 | } | |
911 | flushed += one_round << PAGE_SHIFT; | |
912 | ||
913 | if (n > flushed) { | |
914 | if (nr_pages == 0) | |
915 | nullb->cache_flush_pos = 0; | |
916 | if (one_round == 0) { | |
917 | /* give other threads a chance */ | |
918 | spin_unlock_irq(&nullb->lock); | |
919 | spin_lock_irq(&nullb->lock); | |
920 | } | |
921 | goto again; | |
922 | } | |
923 | return 0; | |
5bcd0e0c SL |
924 | } |
925 | ||
926 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 927 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
928 | { |
929 | size_t temp, count = 0; | |
930 | unsigned int offset; | |
931 | struct nullb_page *t_page; | |
932 | void *dst, *src; | |
933 | ||
934 | while (count < n) { | |
935 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
936 | ||
deb78b41 SL |
937 | if (null_cache_active(nullb) && !is_fua) |
938 | null_make_cache_space(nullb, PAGE_SIZE); | |
939 | ||
5bcd0e0c | 940 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
941 | t_page = null_insert_page(nullb, sector, |
942 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
943 | if (!t_page) |
944 | return -ENOSPC; | |
945 | ||
946 | src = kmap_atomic(source); | |
947 | dst = kmap_atomic(t_page->page); | |
948 | memcpy(dst + offset, src + off + count, temp); | |
949 | kunmap_atomic(dst); | |
950 | kunmap_atomic(src); | |
951 | ||
66231ad3 | 952 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 953 | |
deb78b41 SL |
954 | if (is_fua) |
955 | null_free_sector(nullb, sector, true); | |
956 | ||
5bcd0e0c SL |
957 | count += temp; |
958 | sector += temp >> SECTOR_SHIFT; | |
959 | } | |
960 | return 0; | |
961 | } | |
962 | ||
963 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
964 | unsigned int off, sector_t sector, size_t n) | |
965 | { | |
966 | size_t temp, count = 0; | |
967 | unsigned int offset; | |
968 | struct nullb_page *t_page; | |
969 | void *dst, *src; | |
970 | ||
971 | while (count < n) { | |
972 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
973 | ||
974 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
975 | t_page = null_lookup_page(nullb, sector, false, |
976 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
977 | |
978 | dst = kmap_atomic(dest); | |
979 | if (!t_page) { | |
980 | memset(dst + off + count, 0, temp); | |
981 | goto next; | |
982 | } | |
983 | src = kmap_atomic(t_page->page); | |
984 | memcpy(dst + off + count, src + offset, temp); | |
985 | kunmap_atomic(src); | |
986 | next: | |
987 | kunmap_atomic(dst); | |
988 | ||
989 | count += temp; | |
990 | sector += temp >> SECTOR_SHIFT; | |
991 | } | |
992 | return 0; | |
993 | } | |
994 | ||
306eb6b4 SL |
995 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
996 | { | |
997 | size_t temp; | |
998 | ||
999 | spin_lock_irq(&nullb->lock); | |
1000 | while (n > 0) { | |
1001 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1002 | null_free_sector(nullb, sector, false); |
1003 | if (null_cache_active(nullb)) | |
1004 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1005 | sector += temp >> SECTOR_SHIFT; |
1006 | n -= temp; | |
1007 | } | |
1008 | spin_unlock_irq(&nullb->lock); | |
1009 | } | |
1010 | ||
deb78b41 SL |
1011 | static int null_handle_flush(struct nullb *nullb) |
1012 | { | |
1013 | int err; | |
1014 | ||
1015 | if (!null_cache_active(nullb)) | |
1016 | return 0; | |
1017 | ||
1018 | spin_lock_irq(&nullb->lock); | |
1019 | while (true) { | |
1020 | err = null_make_cache_space(nullb, | |
1021 | nullb->dev->cache_size * 1024 * 1024); | |
1022 | if (err || nullb->dev->curr_cache == 0) | |
1023 | break; | |
1024 | } | |
1025 | ||
1026 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1027 | spin_unlock_irq(&nullb->lock); | |
1028 | return err; | |
1029 | } | |
1030 | ||
5bcd0e0c | 1031 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1032 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1033 | bool is_fua) | |
f2298c04 | 1034 | { |
5bcd0e0c SL |
1035 | int err = 0; |
1036 | ||
1037 | if (!is_write) { | |
1038 | err = copy_from_nullb(nullb, page, off, sector, len); | |
1039 | flush_dcache_page(page); | |
1040 | } else { | |
1041 | flush_dcache_page(page); | |
deb78b41 | 1042 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1043 | } |
1044 | ||
1045 | return err; | |
1046 | } | |
1047 | ||
1048 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1049 | { | |
1050 | struct request *rq = cmd->rq; | |
1051 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1052 | int err; | |
1053 | unsigned int len; | |
1054 | sector_t sector; | |
1055 | struct req_iterator iter; | |
1056 | struct bio_vec bvec; | |
1057 | ||
1058 | sector = blk_rq_pos(rq); | |
1059 | ||
306eb6b4 SL |
1060 | if (req_op(rq) == REQ_OP_DISCARD) { |
1061 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1062 | return 0; | |
1063 | } | |
1064 | ||
5bcd0e0c SL |
1065 | spin_lock_irq(&nullb->lock); |
1066 | rq_for_each_segment(bvec, rq, iter) { | |
1067 | len = bvec.bv_len; | |
1068 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1069 | op_is_write(req_op(rq)), sector, |
1070 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1071 | if (err) { |
1072 | spin_unlock_irq(&nullb->lock); | |
1073 | return err; | |
1074 | } | |
1075 | sector += len >> SECTOR_SHIFT; | |
1076 | } | |
1077 | spin_unlock_irq(&nullb->lock); | |
1078 | ||
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1083 | { | |
1084 | struct bio *bio = cmd->bio; | |
1085 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1086 | int err; | |
1087 | unsigned int len; | |
1088 | sector_t sector; | |
1089 | struct bio_vec bvec; | |
1090 | struct bvec_iter iter; | |
1091 | ||
1092 | sector = bio->bi_iter.bi_sector; | |
1093 | ||
306eb6b4 SL |
1094 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1095 | null_handle_discard(nullb, sector, | |
1096 | bio_sectors(bio) << SECTOR_SHIFT); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
5bcd0e0c SL |
1100 | spin_lock_irq(&nullb->lock); |
1101 | bio_for_each_segment(bvec, bio, iter) { | |
1102 | len = bvec.bv_len; | |
1103 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1104 | op_is_write(bio_op(bio)), sector, |
1105 | bio_op(bio) & REQ_FUA); | |
5bcd0e0c SL |
1106 | if (err) { |
1107 | spin_unlock_irq(&nullb->lock); | |
1108 | return err; | |
1109 | } | |
1110 | sector += len >> SECTOR_SHIFT; | |
1111 | } | |
1112 | spin_unlock_irq(&nullb->lock); | |
1113 | return 0; | |
1114 | } | |
1115 | ||
eff2c4f1 SL |
1116 | static void null_stop_queue(struct nullb *nullb) |
1117 | { | |
1118 | struct request_queue *q = nullb->q; | |
1119 | ||
1120 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1121 | blk_mq_stop_hw_queues(q); | |
1122 | else { | |
1123 | spin_lock_irq(q->queue_lock); | |
1124 | blk_stop_queue(q); | |
1125 | spin_unlock_irq(q->queue_lock); | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | static void null_restart_queue_async(struct nullb *nullb) | |
1130 | { | |
1131 | struct request_queue *q = nullb->q; | |
1132 | unsigned long flags; | |
1133 | ||
1134 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1135 | blk_mq_start_stopped_hw_queues(q, true); | |
1136 | else { | |
1137 | spin_lock_irqsave(q->queue_lock, flags); | |
1138 | blk_start_queue_async(q); | |
1139 | spin_unlock_irqrestore(q->queue_lock, flags); | |
1140 | } | |
1141 | } | |
1142 | ||
5bcd0e0c SL |
1143 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd) |
1144 | { | |
1145 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1146 | struct nullb *nullb = dev->nullb; |
5bcd0e0c SL |
1147 | int err = 0; |
1148 | ||
eff2c4f1 SL |
1149 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
1150 | struct request *rq = cmd->rq; | |
1151 | ||
1152 | if (!hrtimer_active(&nullb->bw_timer)) | |
1153 | hrtimer_restart(&nullb->bw_timer); | |
1154 | ||
1155 | if (atomic_long_sub_return(blk_rq_bytes(rq), | |
1156 | &nullb->cur_bytes) < 0) { | |
1157 | null_stop_queue(nullb); | |
1158 | /* race with timer */ | |
1159 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1160 | null_restart_queue_async(nullb); | |
1161 | if (dev->queue_mode == NULL_Q_RQ) { | |
1162 | struct request_queue *q = nullb->q; | |
1163 | ||
1164 | spin_lock_irq(q->queue_lock); | |
1165 | rq->rq_flags |= RQF_DONTPREP; | |
1166 | blk_requeue_request(q, rq); | |
1167 | spin_unlock_irq(q->queue_lock); | |
1168 | return BLK_STS_OK; | |
1169 | } else | |
1170 | /* requeue request */ | |
86ff7c2a | 1171 | return BLK_STS_DEV_RESOURCE; |
eff2c4f1 SL |
1172 | } |
1173 | } | |
1174 | ||
2f54a613 SL |
1175 | if (nullb->dev->badblocks.shift != -1) { |
1176 | int bad_sectors; | |
1177 | sector_t sector, size, first_bad; | |
1178 | bool is_flush = true; | |
1179 | ||
1180 | if (dev->queue_mode == NULL_Q_BIO && | |
1181 | bio_op(cmd->bio) != REQ_OP_FLUSH) { | |
1182 | is_flush = false; | |
1183 | sector = cmd->bio->bi_iter.bi_sector; | |
1184 | size = bio_sectors(cmd->bio); | |
1185 | } | |
1186 | if (dev->queue_mode != NULL_Q_BIO && | |
1187 | req_op(cmd->rq) != REQ_OP_FLUSH) { | |
1188 | is_flush = false; | |
1189 | sector = blk_rq_pos(cmd->rq); | |
1190 | size = blk_rq_sectors(cmd->rq); | |
1191 | } | |
1192 | if (!is_flush && badblocks_check(&nullb->dev->badblocks, sector, | |
1193 | size, &first_bad, &bad_sectors)) { | |
1194 | cmd->error = BLK_STS_IOERR; | |
1195 | goto out; | |
1196 | } | |
1197 | } | |
1198 | ||
5bcd0e0c | 1199 | if (dev->memory_backed) { |
deb78b41 SL |
1200 | if (dev->queue_mode == NULL_Q_BIO) { |
1201 | if (bio_op(cmd->bio) == REQ_OP_FLUSH) | |
1202 | err = null_handle_flush(nullb); | |
1203 | else | |
1204 | err = null_handle_bio(cmd); | |
1205 | } else { | |
1206 | if (req_op(cmd->rq) == REQ_OP_FLUSH) | |
1207 | err = null_handle_flush(nullb); | |
1208 | else | |
1209 | err = null_handle_rq(cmd); | |
1210 | } | |
5bcd0e0c SL |
1211 | } |
1212 | cmd->error = errno_to_blk_status(err); | |
2f54a613 | 1213 | out: |
f2298c04 | 1214 | /* Complete IO by inline, softirq or timer */ |
5bcd0e0c | 1215 | switch (dev->irqmode) { |
f2298c04 | 1216 | case NULL_IRQ_SOFTIRQ: |
5bcd0e0c | 1217 | switch (dev->queue_mode) { |
ce2c350b | 1218 | case NULL_Q_MQ: |
08e0029a | 1219 | blk_mq_complete_request(cmd->rq); |
ce2c350b CH |
1220 | break; |
1221 | case NULL_Q_RQ: | |
1222 | blk_complete_request(cmd->rq); | |
1223 | break; | |
1224 | case NULL_Q_BIO: | |
1225 | /* | |
1226 | * XXX: no proper submitting cpu information available. | |
1227 | */ | |
1228 | end_cmd(cmd); | |
1229 | break; | |
1230 | } | |
1231 | break; | |
1232 | case NULL_IRQ_NONE: | |
f2298c04 | 1233 | end_cmd(cmd); |
f2298c04 JA |
1234 | break; |
1235 | case NULL_IRQ_TIMER: | |
1236 | null_cmd_end_timer(cmd); | |
1237 | break; | |
1238 | } | |
5bcd0e0c | 1239 | return BLK_STS_OK; |
f2298c04 JA |
1240 | } |
1241 | ||
eff2c4f1 SL |
1242 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1243 | { | |
1244 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1245 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1246 | unsigned int mbps = nullb->dev->mbps; | |
1247 | ||
1248 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1249 | return HRTIMER_NORESTART; | |
1250 | ||
1251 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1252 | null_restart_queue_async(nullb); | |
1253 | ||
1254 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1255 | ||
1256 | return HRTIMER_RESTART; | |
1257 | } | |
1258 | ||
1259 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1260 | { | |
1261 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1262 | ||
1263 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1264 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1265 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1266 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1267 | } |
1268 | ||
1269 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1270 | { | |
1271 | int index = 0; | |
1272 | ||
1273 | if (nullb->nr_queues != 1) | |
1274 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1275 | ||
1276 | return &nullb->queues[index]; | |
1277 | } | |
1278 | ||
dece1635 | 1279 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
1280 | { |
1281 | struct nullb *nullb = q->queuedata; | |
1282 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1283 | struct nullb_cmd *cmd; | |
1284 | ||
1285 | cmd = alloc_cmd(nq, 1); | |
1286 | cmd->bio = bio; | |
1287 | ||
1288 | null_handle_cmd(cmd); | |
dece1635 | 1289 | return BLK_QC_T_NONE; |
f2298c04 JA |
1290 | } |
1291 | ||
5448aca4 JA |
1292 | static enum blk_eh_timer_return null_rq_timed_out_fn(struct request *rq) |
1293 | { | |
1294 | pr_info("null: rq %p timed out\n", rq); | |
0cc61e64 | 1295 | __blk_complete_request(rq); |
0df0bb08 | 1296 | return BLK_EH_DONE; |
5448aca4 JA |
1297 | } |
1298 | ||
f2298c04 JA |
1299 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) |
1300 | { | |
1301 | struct nullb *nullb = q->queuedata; | |
1302 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1303 | struct nullb_cmd *cmd; | |
1304 | ||
1305 | cmd = alloc_cmd(nq, 0); | |
1306 | if (cmd) { | |
1307 | cmd->rq = req; | |
1308 | req->special = cmd; | |
1309 | return BLKPREP_OK; | |
1310 | } | |
8b70f45e | 1311 | blk_stop_queue(q); |
f2298c04 JA |
1312 | |
1313 | return BLKPREP_DEFER; | |
1314 | } | |
1315 | ||
93b57046 JA |
1316 | static bool should_timeout_request(struct request *rq) |
1317 | { | |
33f782c4 | 1318 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 JA |
1319 | if (g_timeout_str[0]) |
1320 | return should_fail(&null_timeout_attr, 1); | |
33f782c4 | 1321 | #endif |
24941b90 JA |
1322 | return false; |
1323 | } | |
93b57046 | 1324 | |
24941b90 JA |
1325 | static bool should_requeue_request(struct request *rq) |
1326 | { | |
1327 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1328 | if (g_requeue_str[0]) | |
1329 | return should_fail(&null_requeue_attr, 1); | |
1330 | #endif | |
93b57046 JA |
1331 | return false; |
1332 | } | |
1333 | ||
f2298c04 JA |
1334 | static void null_request_fn(struct request_queue *q) |
1335 | { | |
1336 | struct request *rq; | |
1337 | ||
1338 | while ((rq = blk_fetch_request(q)) != NULL) { | |
1339 | struct nullb_cmd *cmd = rq->special; | |
1340 | ||
24941b90 JA |
1341 | /* just ignore the request */ |
1342 | if (should_timeout_request(rq)) | |
1343 | continue; | |
1344 | if (should_requeue_request(rq)) { | |
1345 | blk_requeue_request(q, rq); | |
1346 | continue; | |
93b57046 | 1347 | } |
24941b90 JA |
1348 | |
1349 | spin_unlock_irq(q->queue_lock); | |
1350 | null_handle_cmd(cmd); | |
1351 | spin_lock_irq(q->queue_lock); | |
f2298c04 JA |
1352 | } |
1353 | } | |
1354 | ||
5448aca4 JA |
1355 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res) |
1356 | { | |
1357 | pr_info("null: rq %p timed out\n", rq); | |
0df0bb08 CH |
1358 | blk_mq_complete_request(rq); |
1359 | return BLK_EH_DONE; | |
5448aca4 JA |
1360 | } |
1361 | ||
fc17b653 | 1362 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1363 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1364 | { |
74c45052 | 1365 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1366 | struct nullb_queue *nq = hctx->driver_data; |
f2298c04 | 1367 | |
db5bcf87 JA |
1368 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1369 | ||
2984c868 | 1370 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1371 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1372 | cmd->timer.function = null_cmd_timer_expired; | |
1373 | } | |
74c45052 | 1374 | cmd->rq = bd->rq; |
2984c868 | 1375 | cmd->nq = nq; |
f2298c04 | 1376 | |
74c45052 | 1377 | blk_mq_start_request(bd->rq); |
e2490073 | 1378 | |
24941b90 JA |
1379 | if (should_requeue_request(bd->rq)) { |
1380 | /* | |
1381 | * Alternate between hitting the core BUSY path, and the | |
1382 | * driver driven requeue path | |
1383 | */ | |
1384 | nq->requeue_selection++; | |
1385 | if (nq->requeue_selection & 1) | |
1386 | return BLK_STS_RESOURCE; | |
1387 | else { | |
1388 | blk_mq_requeue_request(bd->rq, true); | |
1389 | return BLK_STS_OK; | |
1390 | } | |
1391 | } | |
1392 | if (should_timeout_request(bd->rq)) | |
1393 | return BLK_STS_OK; | |
93b57046 | 1394 | |
24941b90 | 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, |
5448aca4 | 1401 | .timeout = null_timeout_rq, |
f2298c04 JA |
1402 | }; |
1403 | ||
de65d2d2 MB |
1404 | static void cleanup_queue(struct nullb_queue *nq) |
1405 | { | |
1406 | kfree(nq->tag_map); | |
1407 | kfree(nq->cmds); | |
1408 | } | |
1409 | ||
1410 | static void cleanup_queues(struct nullb *nullb) | |
1411 | { | |
1412 | int i; | |
1413 | ||
1414 | for (i = 0; i < nullb->nr_queues; i++) | |
1415 | cleanup_queue(&nullb->queues[i]); | |
1416 | ||
1417 | kfree(nullb->queues); | |
1418 | } | |
1419 | ||
9ae2d0aa MB |
1420 | static void null_del_dev(struct nullb *nullb) |
1421 | { | |
2984c868 SL |
1422 | struct nullb_device *dev = nullb->dev; |
1423 | ||
94bc02e3 SL |
1424 | ida_simple_remove(&nullb_indexes, nullb->index); |
1425 | ||
9ae2d0aa MB |
1426 | list_del_init(&nullb->list); |
1427 | ||
74ede5af | 1428 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1429 | |
1430 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1431 | hrtimer_cancel(&nullb->bw_timer); | |
1432 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1433 | null_restart_queue_async(nullb); | |
1434 | } | |
1435 | ||
9ae2d0aa | 1436 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1437 | if (dev->queue_mode == NULL_Q_MQ && |
1438 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1439 | blk_mq_free_tag_set(nullb->tag_set); |
74ede5af | 1440 | put_disk(nullb->disk); |
9ae2d0aa | 1441 | cleanup_queues(nullb); |
deb78b41 SL |
1442 | if (null_cache_active(nullb)) |
1443 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1444 | kfree(nullb); |
2984c868 | 1445 | dev->nullb = NULL; |
9ae2d0aa MB |
1446 | } |
1447 | ||
306eb6b4 SL |
1448 | static void null_config_discard(struct nullb *nullb) |
1449 | { | |
1450 | if (nullb->dev->discard == false) | |
1451 | return; | |
1452 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1453 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1454 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
8b904b5b | 1455 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q); |
9ae2d0aa MB |
1456 | } |
1457 | ||
f2298c04 JA |
1458 | static int null_open(struct block_device *bdev, fmode_t mode) |
1459 | { | |
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | static void null_release(struct gendisk *disk, fmode_t mode) | |
1464 | { | |
1465 | } | |
1466 | ||
1467 | static const struct block_device_operations null_fops = { | |
1468 | .owner = THIS_MODULE, | |
1469 | .open = null_open, | |
1470 | .release = null_release, | |
1471 | }; | |
1472 | ||
82f402fe JA |
1473 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1474 | { | |
1475 | BUG_ON(!nullb); | |
1476 | BUG_ON(!nq); | |
1477 | ||
1478 | init_waitqueue_head(&nq->wait); | |
1479 | nq->queue_depth = nullb->queue_depth; | |
2984c868 | 1480 | nq->dev = nullb->dev; |
82f402fe JA |
1481 | } |
1482 | ||
1483 | static void null_init_queues(struct nullb *nullb) | |
1484 | { | |
1485 | struct request_queue *q = nullb->q; | |
1486 | struct blk_mq_hw_ctx *hctx; | |
1487 | struct nullb_queue *nq; | |
1488 | int i; | |
1489 | ||
1490 | queue_for_each_hw_ctx(q, hctx, i) { | |
1491 | if (!hctx->nr_ctx || !hctx->tags) | |
1492 | continue; | |
1493 | nq = &nullb->queues[i]; | |
1494 | hctx->driver_data = nq; | |
1495 | null_init_queue(nullb, nq); | |
1496 | nullb->nr_queues++; | |
1497 | } | |
1498 | } | |
1499 | ||
f2298c04 JA |
1500 | static int setup_commands(struct nullb_queue *nq) |
1501 | { | |
1502 | struct nullb_cmd *cmd; | |
1503 | int i, tag_size; | |
1504 | ||
6396bb22 | 1505 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
f2298c04 | 1506 | if (!nq->cmds) |
2d263a78 | 1507 | return -ENOMEM; |
f2298c04 JA |
1508 | |
1509 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
6396bb22 | 1510 | nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL); |
f2298c04 JA |
1511 | if (!nq->tag_map) { |
1512 | kfree(nq->cmds); | |
2d263a78 | 1513 | return -ENOMEM; |
f2298c04 JA |
1514 | } |
1515 | ||
1516 | for (i = 0; i < nq->queue_depth; i++) { | |
1517 | cmd = &nq->cmds[i]; | |
1518 | INIT_LIST_HEAD(&cmd->list); | |
1519 | cmd->ll_list.next = NULL; | |
1520 | cmd->tag = -1U; | |
1521 | } | |
1522 | ||
1523 | return 0; | |
1524 | } | |
1525 | ||
f2298c04 JA |
1526 | static int setup_queues(struct nullb *nullb) |
1527 | { | |
6396bb22 KC |
1528 | nullb->queues = kcalloc(nullb->dev->submit_queues, |
1529 | sizeof(struct nullb_queue), | |
1530 | GFP_KERNEL); | |
f2298c04 | 1531 | if (!nullb->queues) |
2d263a78 | 1532 | return -ENOMEM; |
f2298c04 JA |
1533 | |
1534 | nullb->nr_queues = 0; | |
2984c868 | 1535 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1536 | |
2d263a78 MB |
1537 | return 0; |
1538 | } | |
1539 | ||
1540 | static int init_driver_queues(struct nullb *nullb) | |
1541 | { | |
1542 | struct nullb_queue *nq; | |
1543 | int i, ret = 0; | |
f2298c04 | 1544 | |
2984c868 | 1545 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1546 | nq = &nullb->queues[i]; |
2d263a78 MB |
1547 | |
1548 | null_init_queue(nullb, nq); | |
1549 | ||
1550 | ret = setup_commands(nq); | |
1551 | if (ret) | |
31f9690e | 1552 | return ret; |
f2298c04 JA |
1553 | nullb->nr_queues++; |
1554 | } | |
2d263a78 | 1555 | return 0; |
f2298c04 JA |
1556 | } |
1557 | ||
9ae2d0aa | 1558 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
1559 | { |
1560 | struct gendisk *disk; | |
f2298c04 | 1561 | sector_t size; |
9ae2d0aa | 1562 | |
2984c868 | 1563 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1564 | if (!disk) |
1565 | return -ENOMEM; | |
2984c868 | 1566 | size = (sector_t)nullb->dev->size * 1024 * 1024ULL; |
9ae2d0aa MB |
1567 | set_capacity(disk, size >> 9); |
1568 | ||
1569 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1570 | disk->major = null_major; | |
1571 | disk->first_minor = nullb->index; | |
1572 | disk->fops = &null_fops; | |
1573 | disk->private_data = nullb; | |
1574 | disk->queue = nullb->q; | |
1575 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1576 | ||
1577 | add_disk(disk); | |
1578 | return 0; | |
1579 | } | |
1580 | ||
2984c868 | 1581 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1582 | { |
1583 | set->ops = &null_mq_ops; | |
2984c868 SL |
1584 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1585 | g_submit_queues; | |
1586 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1587 | g_hw_queue_depth; | |
1588 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1589 | set->cmd_size = sizeof(struct nullb_cmd); |
1590 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1591 | if (g_no_sched) |
1592 | set->flags |= BLK_MQ_F_NO_SCHED; | |
82f402fe JA |
1593 | set->driver_data = NULL; |
1594 | ||
0d06a42f | 1595 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1596 | set->flags |= BLK_MQ_F_BLOCKING; |
1597 | ||
1598 | return blk_mq_alloc_tag_set(set); | |
1599 | } | |
1600 | ||
cedcafad SL |
1601 | static void null_validate_conf(struct nullb_device *dev) |
1602 | { | |
1603 | dev->blocksize = round_down(dev->blocksize, 512); | |
1604 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad SL |
1605 | |
1606 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1607 | if (dev->submit_queues != nr_online_nodes) | |
1608 | dev->submit_queues = nr_online_nodes; | |
1609 | } else if (dev->submit_queues > nr_cpu_ids) | |
1610 | dev->submit_queues = nr_cpu_ids; | |
1611 | else if (dev->submit_queues == 0) | |
1612 | dev->submit_queues = 1; | |
1613 | ||
1614 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1615 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1616 | |
1617 | /* Do memory allocation, so set blocking */ | |
1618 | if (dev->memory_backed) | |
1619 | dev->blocking = true; | |
deb78b41 SL |
1620 | else /* cache is meaningless */ |
1621 | dev->cache_size = 0; | |
1622 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1623 | dev->cache_size); | |
eff2c4f1 SL |
1624 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1625 | /* can not stop a queue */ | |
1626 | if (dev->queue_mode == NULL_Q_BIO) | |
1627 | dev->mbps = 0; | |
cedcafad SL |
1628 | } |
1629 | ||
33f782c4 | 1630 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1631 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1632 | { | |
1633 | if (!str[0]) | |
93b57046 JA |
1634 | return true; |
1635 | ||
24941b90 | 1636 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1637 | return false; |
1638 | ||
24941b90 JA |
1639 | attr->verbose = 0; |
1640 | return true; | |
1641 | } | |
1642 | #endif | |
1643 | ||
1644 | static bool null_setup_fault(void) | |
1645 | { | |
1646 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1647 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1648 | return false; | |
1649 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1650 | return false; | |
33f782c4 | 1651 | #endif |
93b57046 JA |
1652 | return true; |
1653 | } | |
1654 | ||
2984c868 | 1655 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1656 | { |
1657 | struct nullb *nullb; | |
dc501dc0 | 1658 | int rv; |
f2298c04 | 1659 | |
cedcafad SL |
1660 | null_validate_conf(dev); |
1661 | ||
2984c868 | 1662 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1663 | if (!nullb) { |
1664 | rv = -ENOMEM; | |
24d2f903 | 1665 | goto out; |
dc501dc0 | 1666 | } |
2984c868 SL |
1667 | nullb->dev = dev; |
1668 | dev->nullb = nullb; | |
f2298c04 JA |
1669 | |
1670 | spin_lock_init(&nullb->lock); | |
1671 | ||
dc501dc0 RE |
1672 | rv = setup_queues(nullb); |
1673 | if (rv) | |
24d2f903 | 1674 | goto out_free_nullb; |
f2298c04 | 1675 | |
2984c868 | 1676 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1677 | if (shared_tags) { |
1678 | nullb->tag_set = &tag_set; | |
1679 | rv = 0; | |
1680 | } else { | |
1681 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1682 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1683 | } |
1684 | ||
dc501dc0 | 1685 | if (rv) |
24d2f903 CH |
1686 | goto out_cleanup_queues; |
1687 | ||
93b57046 JA |
1688 | if (!null_setup_fault()) |
1689 | goto out_cleanup_queues; | |
1690 | ||
5448aca4 | 1691 | nullb->tag_set->timeout = 5 * HZ; |
82f402fe | 1692 | nullb->q = blk_mq_init_queue(nullb->tag_set); |
35b489d3 | 1693 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1694 | rv = -ENOMEM; |
24d2f903 | 1695 | goto out_cleanup_tags; |
dc501dc0 | 1696 | } |
82f402fe | 1697 | null_init_queues(nullb); |
2984c868 | 1698 | } else if (dev->queue_mode == NULL_Q_BIO) { |
5ee0524b BVA |
1699 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node, |
1700 | NULL); | |
dc501dc0 RE |
1701 | if (!nullb->q) { |
1702 | rv = -ENOMEM; | |
24d2f903 | 1703 | goto out_cleanup_queues; |
dc501dc0 | 1704 | } |
f2298c04 | 1705 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1706 | rv = init_driver_queues(nullb); |
1707 | if (rv) | |
1708 | goto out_cleanup_blk_queue; | |
f2298c04 | 1709 | } else { |
2984c868 SL |
1710 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, |
1711 | dev->home_node); | |
dc501dc0 RE |
1712 | if (!nullb->q) { |
1713 | rv = -ENOMEM; | |
24d2f903 | 1714 | goto out_cleanup_queues; |
dc501dc0 | 1715 | } |
93b57046 JA |
1716 | |
1717 | if (!null_setup_fault()) | |
1718 | goto out_cleanup_blk_queue; | |
1719 | ||
f2298c04 | 1720 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 1721 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
5448aca4 JA |
1722 | blk_queue_rq_timed_out(nullb->q, null_rq_timed_out_fn); |
1723 | nullb->q->rq_timeout = 5 * HZ; | |
31f9690e JK |
1724 | rv = init_driver_queues(nullb); |
1725 | if (rv) | |
1726 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1727 | } |
1728 | ||
eff2c4f1 SL |
1729 | if (dev->mbps) { |
1730 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1731 | nullb_setup_bwtimer(nullb); | |
1732 | } | |
1733 | ||
deb78b41 SL |
1734 | if (dev->cache_size > 0) { |
1735 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1736 | blk_queue_write_cache(nullb->q, true, true); | |
1737 | blk_queue_flush_queueable(nullb->q, true); | |
1738 | } | |
1739 | ||
f2298c04 | 1740 | nullb->q->queuedata = nullb; |
8b904b5b BVA |
1741 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
1742 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); | |
f2298c04 | 1743 | |
f2298c04 | 1744 | mutex_lock(&lock); |
94bc02e3 | 1745 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1746 | dev->index = nullb->index; |
f2298c04 JA |
1747 | mutex_unlock(&lock); |
1748 | ||
2984c868 SL |
1749 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1750 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1751 | |
306eb6b4 | 1752 | null_config_discard(nullb); |
f2298c04 | 1753 | |
b2b7e001 MB |
1754 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1755 | ||
74ede5af | 1756 | rv = null_gendisk_register(nullb); |
9ae2d0aa MB |
1757 | if (rv) |
1758 | goto out_cleanup_blk_queue; | |
a514379b MB |
1759 | |
1760 | mutex_lock(&lock); | |
1761 | list_add_tail(&nullb->list, &nullb_list); | |
1762 | mutex_unlock(&lock); | |
3681c85d | 1763 | |
f2298c04 | 1764 | return 0; |
24d2f903 CH |
1765 | out_cleanup_blk_queue: |
1766 | blk_cleanup_queue(nullb->q); | |
1767 | out_cleanup_tags: | |
2984c868 | 1768 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1769 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1770 | out_cleanup_queues: |
1771 | cleanup_queues(nullb); | |
1772 | out_free_nullb: | |
1773 | kfree(nullb); | |
1774 | out: | |
dc501dc0 | 1775 | return rv; |
f2298c04 JA |
1776 | } |
1777 | ||
1778 | static int __init null_init(void) | |
1779 | { | |
af096e22 | 1780 | int ret = 0; |
f2298c04 | 1781 | unsigned int i; |
af096e22 | 1782 | struct nullb *nullb; |
2984c868 | 1783 | struct nullb_device *dev; |
f2298c04 | 1784 | |
2984c868 | 1785 | if (g_bs > PAGE_SIZE) { |
9967d8ac R |
1786 | pr_warn("null_blk: invalid block size\n"); |
1787 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1788 | g_bs = PAGE_SIZE; |
9967d8ac | 1789 | } |
f2298c04 | 1790 | |
2984c868 SL |
1791 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1792 | if (g_submit_queues != nr_online_nodes) { | |
558ab300 | 1793 | pr_warn("null_blk: submit_queues param is set to %u.\n", |
d15ee6b1 | 1794 | nr_online_nodes); |
2984c868 | 1795 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1796 | } |
2984c868 SL |
1797 | } else if (g_submit_queues > nr_cpu_ids) |
1798 | g_submit_queues = nr_cpu_ids; | |
1799 | else if (g_submit_queues <= 0) | |
1800 | g_submit_queues = 1; | |
f2298c04 | 1801 | |
2984c868 SL |
1802 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1803 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1804 | if (ret) |
1805 | return ret; | |
1806 | } | |
1807 | ||
3bf2bd20 SL |
1808 | config_group_init(&nullb_subsys.su_group); |
1809 | mutex_init(&nullb_subsys.su_mutex); | |
1810 | ||
1811 | ret = configfs_register_subsystem(&nullb_subsys); | |
1812 | if (ret) | |
1813 | goto err_tagset; | |
1814 | ||
f2298c04 JA |
1815 | mutex_init(&lock); |
1816 | ||
f2298c04 | 1817 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1818 | if (null_major < 0) { |
1819 | ret = null_major; | |
3bf2bd20 | 1820 | goto err_conf; |
db2d153d | 1821 | } |
f2298c04 JA |
1822 | |
1823 | for (i = 0; i < nr_devices; i++) { | |
2984c868 | 1824 | dev = null_alloc_dev(); |
30c516d7 WY |
1825 | if (!dev) { |
1826 | ret = -ENOMEM; | |
2984c868 | 1827 | goto err_dev; |
30c516d7 | 1828 | } |
2984c868 SL |
1829 | ret = null_add_dev(dev); |
1830 | if (ret) { | |
1831 | null_free_dev(dev); | |
af096e22 | 1832 | goto err_dev; |
2984c868 | 1833 | } |
f2298c04 JA |
1834 | } |
1835 | ||
1836 | pr_info("null: module loaded\n"); | |
1837 | return 0; | |
af096e22 MH |
1838 | |
1839 | err_dev: | |
1840 | while (!list_empty(&nullb_list)) { | |
1841 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 1842 | dev = nullb->dev; |
af096e22 | 1843 | null_del_dev(nullb); |
2984c868 | 1844 | null_free_dev(dev); |
af096e22 | 1845 | } |
af096e22 | 1846 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
1847 | err_conf: |
1848 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 1849 | err_tagset: |
2984c868 | 1850 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 1851 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 1852 | return ret; |
f2298c04 JA |
1853 | } |
1854 | ||
1855 | static void __exit null_exit(void) | |
1856 | { | |
1857 | struct nullb *nullb; | |
1858 | ||
3bf2bd20 SL |
1859 | configfs_unregister_subsystem(&nullb_subsys); |
1860 | ||
f2298c04 JA |
1861 | unregister_blkdev(null_major, "nullb"); |
1862 | ||
1863 | mutex_lock(&lock); | |
1864 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
1865 | struct nullb_device *dev; |
1866 | ||
f2298c04 | 1867 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 1868 | dev = nullb->dev; |
f2298c04 | 1869 | null_del_dev(nullb); |
2984c868 | 1870 | null_free_dev(dev); |
f2298c04 JA |
1871 | } |
1872 | mutex_unlock(&lock); | |
6bb9535b | 1873 | |
2984c868 | 1874 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe | 1875 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
1876 | } |
1877 | ||
1878 | module_init(null_init); | |
1879 | module_exit(null_exit); | |
1880 | ||
231b3db1 | 1881 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 1882 | MODULE_LICENSE("GPL"); |