Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3bf2bd20 SL |
2 | /* |
3 | * Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and | |
4 | * Shaohua Li <shli@fb.com> | |
5 | */ | |
f2298c04 | 6 | #include <linux/module.h> |
fc1bc354 | 7 | |
f2298c04 JA |
8 | #include <linux/moduleparam.h> |
9 | #include <linux/sched.h> | |
10 | #include <linux/fs.h> | |
f2298c04 | 11 | #include <linux/init.h> |
6dad38d3 | 12 | #include "null_blk.h" |
f2298c04 | 13 | |
5bcd0e0c SL |
14 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) |
15 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) | |
5bcd0e0c SL |
16 | #define SECTOR_MASK (PAGE_SECTORS - 1) |
17 | ||
18 | #define FREE_BATCH 16 | |
19 | ||
eff2c4f1 SL |
20 | #define TICKS_PER_SEC 50ULL |
21 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
22 | ||
33f782c4 | 23 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 24 | static DECLARE_FAULT_ATTR(null_timeout_attr); |
24941b90 | 25 | static DECLARE_FAULT_ATTR(null_requeue_attr); |
33f782c4 | 26 | #endif |
93b57046 | 27 | |
eff2c4f1 SL |
28 | static inline u64 mb_per_tick(int mbps) |
29 | { | |
30 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
31 | } | |
f2298c04 | 32 | |
3bf2bd20 SL |
33 | /* |
34 | * Status flags for nullb_device. | |
35 | * | |
36 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
37 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 38 | * THROTTLED: Device is being throttled. |
deb78b41 | 39 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
40 | */ |
41 | enum nullb_device_flags { | |
42 | NULLB_DEV_FL_CONFIGURED = 0, | |
43 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 44 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 45 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
46 | }; |
47 | ||
66231ad3 | 48 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
49 | /* |
50 | * nullb_page is a page in memory for nullb devices. | |
51 | * | |
52 | * @page: The page holding the data. | |
53 | * @bitmap: The bitmap represents which sector in the page has data. | |
54 | * Each bit represents one block size. For example, sector 8 | |
55 | * will use the 7th bit | |
deb78b41 SL |
56 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
57 | * page is being flushing to storage. FREE means the cache page is freed and | |
58 | * should be skipped from flushing to storage. Please see | |
59 | * null_make_cache_space | |
5bcd0e0c SL |
60 | */ |
61 | struct nullb_page { | |
62 | struct page *page; | |
66231ad3 | 63 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 64 | }; |
66231ad3 ML |
65 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
66 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 67 | |
f2298c04 JA |
68 | static LIST_HEAD(nullb_list); |
69 | static struct mutex lock; | |
70 | static int null_major; | |
94bc02e3 | 71 | static DEFINE_IDA(nullb_indexes); |
82f402fe | 72 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 73 | |
f2298c04 JA |
74 | enum { |
75 | NULL_IRQ_NONE = 0, | |
76 | NULL_IRQ_SOFTIRQ = 1, | |
77 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 78 | }; |
f2298c04 | 79 | |
ce2c350b | 80 | enum { |
f2298c04 JA |
81 | NULL_Q_BIO = 0, |
82 | NULL_Q_RQ = 1, | |
83 | NULL_Q_MQ = 2, | |
84 | }; | |
85 | ||
b3cffc38 | 86 | static int g_no_sched; |
5657a819 | 87 | module_param_named(no_sched, g_no_sched, int, 0444); |
b3cffc38 | 88 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
89 | ||
2984c868 | 90 | static int g_submit_queues = 1; |
5657a819 | 91 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
f2298c04 JA |
92 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
93 | ||
2984c868 | 94 | static int g_home_node = NUMA_NO_NODE; |
5657a819 | 95 | module_param_named(home_node, g_home_node, int, 0444); |
f2298c04 JA |
96 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
97 | ||
33f782c4 | 98 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 99 | static char g_timeout_str[80]; |
5657a819 | 100 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
24941b90 JA |
101 | |
102 | static char g_requeue_str[80]; | |
5657a819 | 103 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
33f782c4 | 104 | #endif |
93b57046 | 105 | |
2984c868 | 106 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
107 | |
108 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
109 | { | |
110 | int ret, new_val; | |
111 | ||
112 | ret = kstrtoint(str, 10, &new_val); | |
113 | if (ret) | |
114 | return -EINVAL; | |
115 | ||
116 | if (new_val < min || new_val > max) | |
117 | return -EINVAL; | |
118 | ||
119 | *val = new_val; | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
124 | { | |
2984c868 | 125 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
126 | } |
127 | ||
9c27847d | 128 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
129 | .set = null_set_queue_mode, |
130 | .get = param_get_int, | |
131 | }; | |
132 | ||
5657a819 | 133 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
54ae81cd | 134 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 135 | |
2984c868 | 136 | static int g_gb = 250; |
5657a819 | 137 | module_param_named(gb, g_gb, int, 0444); |
f2298c04 JA |
138 | MODULE_PARM_DESC(gb, "Size in GB"); |
139 | ||
2984c868 | 140 | static int g_bs = 512; |
5657a819 | 141 | module_param_named(bs, g_bs, int, 0444); |
f2298c04 JA |
142 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
143 | ||
f7c4ce89 | 144 | static unsigned int nr_devices = 1; |
701dfc42 | 145 | module_param(nr_devices, uint, 0444); |
f2298c04 JA |
146 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
147 | ||
2984c868 | 148 | static bool g_blocking; |
5657a819 | 149 | module_param_named(blocking, g_blocking, bool, 0444); |
db5bcf87 JA |
150 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
151 | ||
82f402fe | 152 | static bool shared_tags; |
5657a819 | 153 | module_param(shared_tags, bool, 0444); |
82f402fe JA |
154 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
155 | ||
2984c868 | 156 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
157 | |
158 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
159 | { | |
2984c868 | 160 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
161 | NULL_IRQ_TIMER); |
162 | } | |
163 | ||
9c27847d | 164 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
165 | .set = null_set_irqmode, |
166 | .get = param_get_int, | |
167 | }; | |
168 | ||
5657a819 | 169 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
f2298c04 JA |
170 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
171 | ||
2984c868 | 172 | static unsigned long g_completion_nsec = 10000; |
5657a819 | 173 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
f2298c04 JA |
174 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
175 | ||
2984c868 | 176 | static int g_hw_queue_depth = 64; |
5657a819 | 177 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
f2298c04 JA |
178 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
179 | ||
2984c868 | 180 | static bool g_use_per_node_hctx; |
5657a819 | 181 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
20005244 | 182 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 183 | |
ca4b2a01 MB |
184 | static bool g_zoned; |
185 | module_param_named(zoned, g_zoned, bool, S_IRUGO); | |
186 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); | |
187 | ||
188 | static unsigned long g_zone_size = 256; | |
189 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); | |
190 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); | |
191 | ||
ea2c18e1 MS |
192 | static unsigned int g_zone_nr_conv; |
193 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); | |
194 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); | |
195 | ||
3bf2bd20 SL |
196 | static struct nullb_device *null_alloc_dev(void); |
197 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
198 | static void null_del_dev(struct nullb *nullb); |
199 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 200 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
201 | |
202 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
203 | { | |
204 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
205 | } | |
206 | ||
207 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
208 | { | |
209 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
210 | } | |
211 | ||
212 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
213 | char *page) | |
214 | { | |
215 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
216 | } | |
217 | ||
218 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
219 | { | |
220 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
221 | } | |
222 | ||
223 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
224 | const char *page, size_t count) | |
225 | { | |
226 | unsigned int tmp; | |
227 | int result; | |
228 | ||
229 | result = kstrtouint(page, 0, &tmp); | |
45919fbf | 230 | if (result < 0) |
3bf2bd20 SL |
231 | return result; |
232 | ||
233 | *val = tmp; | |
234 | return count; | |
235 | } | |
236 | ||
237 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
238 | const char *page, size_t count) | |
239 | { | |
240 | int result; | |
241 | unsigned long tmp; | |
242 | ||
243 | result = kstrtoul(page, 0, &tmp); | |
45919fbf | 244 | if (result < 0) |
3bf2bd20 SL |
245 | return result; |
246 | ||
247 | *val = tmp; | |
248 | return count; | |
249 | } | |
250 | ||
251 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
252 | size_t count) | |
253 | { | |
254 | bool tmp; | |
255 | int result; | |
256 | ||
257 | result = kstrtobool(page, &tmp); | |
45919fbf | 258 | if (result < 0) |
3bf2bd20 SL |
259 | return result; |
260 | ||
261 | *val = tmp; | |
262 | return count; | |
263 | } | |
264 | ||
265 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
ca0a95a6 AM |
266 | #define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \ |
267 | static ssize_t \ | |
268 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
269 | { \ | |
270 | return nullb_device_##TYPE##_attr_show( \ | |
271 | to_nullb_device(item)->NAME, page); \ | |
272 | } \ | |
273 | static ssize_t \ | |
274 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
275 | size_t count) \ | |
276 | { \ | |
277 | int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ | |
278 | struct nullb_device *dev = to_nullb_device(item); \ | |
b9853b4d | 279 | TYPE new_value = 0; \ |
ca0a95a6 AM |
280 | int ret; \ |
281 | \ | |
282 | ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ | |
283 | if (ret < 0) \ | |
284 | return ret; \ | |
285 | if (apply_fn) \ | |
286 | ret = apply_fn(dev, new_value); \ | |
287 | else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \ | |
288 | ret = -EBUSY; \ | |
289 | if (ret < 0) \ | |
290 | return ret; \ | |
291 | dev->NAME = new_value; \ | |
292 | return count; \ | |
293 | } \ | |
3bf2bd20 SL |
294 | CONFIGFS_ATTR(nullb_device_, NAME); |
295 | ||
45919fbf BVA |
296 | static int nullb_apply_submit_queues(struct nullb_device *dev, |
297 | unsigned int submit_queues) | |
298 | { | |
299 | struct nullb *nullb = dev->nullb; | |
300 | struct blk_mq_tag_set *set; | |
301 | ||
302 | if (!nullb) | |
303 | return 0; | |
304 | ||
78b10be2 BVA |
305 | /* |
306 | * Make sure that null_init_hctx() does not access nullb->queues[] past | |
307 | * the end of that array. | |
308 | */ | |
309 | if (submit_queues > nr_cpu_ids) | |
310 | return -EINVAL; | |
45919fbf BVA |
311 | set = nullb->tag_set; |
312 | blk_mq_update_nr_hw_queues(set, submit_queues); | |
313 | return set->nr_hw_queues == submit_queues ? 0 : -ENOMEM; | |
314 | } | |
315 | ||
316 | NULLB_DEVICE_ATTR(size, ulong, NULL); | |
317 | NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL); | |
318 | NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues); | |
319 | NULLB_DEVICE_ATTR(home_node, uint, NULL); | |
320 | NULLB_DEVICE_ATTR(queue_mode, uint, NULL); | |
321 | NULLB_DEVICE_ATTR(blocksize, uint, NULL); | |
322 | NULLB_DEVICE_ATTR(irqmode, uint, NULL); | |
323 | NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); | |
324 | NULLB_DEVICE_ATTR(index, uint, NULL); | |
325 | NULLB_DEVICE_ATTR(blocking, bool, NULL); | |
326 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL); | |
327 | NULLB_DEVICE_ATTR(memory_backed, bool, NULL); | |
328 | NULLB_DEVICE_ATTR(discard, bool, NULL); | |
329 | NULLB_DEVICE_ATTR(mbps, uint, NULL); | |
330 | NULLB_DEVICE_ATTR(cache_size, ulong, NULL); | |
331 | NULLB_DEVICE_ATTR(zoned, bool, NULL); | |
332 | NULLB_DEVICE_ATTR(zone_size, ulong, NULL); | |
333 | NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL); | |
3bf2bd20 | 334 | |
cedcafad SL |
335 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
336 | { | |
337 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
338 | } | |
339 | ||
340 | static ssize_t nullb_device_power_store(struct config_item *item, | |
341 | const char *page, size_t count) | |
342 | { | |
343 | struct nullb_device *dev = to_nullb_device(item); | |
344 | bool newp = false; | |
345 | ssize_t ret; | |
346 | ||
347 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
348 | if (ret < 0) | |
349 | return ret; | |
350 | ||
351 | if (!dev->power && newp) { | |
352 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
353 | return count; | |
354 | if (null_add_dev(dev)) { | |
355 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
356 | return -ENOMEM; | |
357 | } | |
358 | ||
359 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
360 | dev->power = newp; | |
b3c30512 | 361 | } else if (dev->power && !newp) { |
7602843f BL |
362 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
363 | mutex_lock(&lock); | |
364 | dev->power = newp; | |
365 | null_del_dev(dev->nullb); | |
366 | mutex_unlock(&lock); | |
367 | } | |
00a8cdb8 | 368 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
369 | } |
370 | ||
371 | return count; | |
372 | } | |
373 | ||
374 | CONFIGFS_ATTR(nullb_device_, power); | |
375 | ||
2f54a613 SL |
376 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
377 | { | |
378 | struct nullb_device *t_dev = to_nullb_device(item); | |
379 | ||
380 | return badblocks_show(&t_dev->badblocks, page, 0); | |
381 | } | |
382 | ||
383 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
384 | const char *page, size_t count) | |
385 | { | |
386 | struct nullb_device *t_dev = to_nullb_device(item); | |
387 | char *orig, *buf, *tmp; | |
388 | u64 start, end; | |
389 | int ret; | |
390 | ||
391 | orig = kstrndup(page, count, GFP_KERNEL); | |
392 | if (!orig) | |
393 | return -ENOMEM; | |
394 | ||
395 | buf = strstrip(orig); | |
396 | ||
397 | ret = -EINVAL; | |
398 | if (buf[0] != '+' && buf[0] != '-') | |
399 | goto out; | |
400 | tmp = strchr(&buf[1], '-'); | |
401 | if (!tmp) | |
402 | goto out; | |
403 | *tmp = '\0'; | |
404 | ret = kstrtoull(buf + 1, 0, &start); | |
405 | if (ret) | |
406 | goto out; | |
407 | ret = kstrtoull(tmp + 1, 0, &end); | |
408 | if (ret) | |
409 | goto out; | |
410 | ret = -EINVAL; | |
411 | if (start > end) | |
412 | goto out; | |
413 | /* enable badblocks */ | |
414 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
415 | if (buf[0] == '+') | |
416 | ret = badblocks_set(&t_dev->badblocks, start, | |
417 | end - start + 1, 1); | |
418 | else | |
419 | ret = badblocks_clear(&t_dev->badblocks, start, | |
420 | end - start + 1); | |
421 | if (ret == 0) | |
422 | ret = count; | |
423 | out: | |
424 | kfree(orig); | |
425 | return ret; | |
426 | } | |
427 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
428 | ||
3bf2bd20 SL |
429 | static struct configfs_attribute *nullb_device_attrs[] = { |
430 | &nullb_device_attr_size, | |
431 | &nullb_device_attr_completion_nsec, | |
432 | &nullb_device_attr_submit_queues, | |
433 | &nullb_device_attr_home_node, | |
434 | &nullb_device_attr_queue_mode, | |
435 | &nullb_device_attr_blocksize, | |
436 | &nullb_device_attr_irqmode, | |
437 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 438 | &nullb_device_attr_index, |
3bf2bd20 SL |
439 | &nullb_device_attr_blocking, |
440 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 441 | &nullb_device_attr_power, |
5bcd0e0c | 442 | &nullb_device_attr_memory_backed, |
306eb6b4 | 443 | &nullb_device_attr_discard, |
eff2c4f1 | 444 | &nullb_device_attr_mbps, |
deb78b41 | 445 | &nullb_device_attr_cache_size, |
2f54a613 | 446 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
447 | &nullb_device_attr_zoned, |
448 | &nullb_device_attr_zone_size, | |
ea2c18e1 | 449 | &nullb_device_attr_zone_nr_conv, |
3bf2bd20 SL |
450 | NULL, |
451 | }; | |
452 | ||
453 | static void nullb_device_release(struct config_item *item) | |
454 | { | |
5bcd0e0c SL |
455 | struct nullb_device *dev = to_nullb_device(item); |
456 | ||
deb78b41 | 457 | null_free_device_storage(dev, false); |
5bcd0e0c | 458 | null_free_dev(dev); |
3bf2bd20 SL |
459 | } |
460 | ||
461 | static struct configfs_item_operations nullb_device_ops = { | |
462 | .release = nullb_device_release, | |
463 | }; | |
464 | ||
e1919dff | 465 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
466 | .ct_item_ops = &nullb_device_ops, |
467 | .ct_attrs = nullb_device_attrs, | |
468 | .ct_owner = THIS_MODULE, | |
469 | }; | |
470 | ||
471 | static struct | |
472 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
473 | { | |
474 | struct nullb_device *dev; | |
475 | ||
476 | dev = null_alloc_dev(); | |
477 | if (!dev) | |
478 | return ERR_PTR(-ENOMEM); | |
479 | ||
480 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
481 | ||
482 | return &dev->item; | |
483 | } | |
484 | ||
485 | static void | |
486 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
487 | { | |
cedcafad SL |
488 | struct nullb_device *dev = to_nullb_device(item); |
489 | ||
490 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
491 | mutex_lock(&lock); | |
492 | dev->power = false; | |
493 | null_del_dev(dev->nullb); | |
494 | mutex_unlock(&lock); | |
495 | } | |
496 | ||
3bf2bd20 SL |
497 | config_item_put(item); |
498 | } | |
499 | ||
500 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
501 | { | |
6d09c408 | 502 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size,zone_nr_conv\n"); |
3bf2bd20 SL |
503 | } |
504 | ||
505 | CONFIGFS_ATTR_RO(memb_group_, features); | |
506 | ||
507 | static struct configfs_attribute *nullb_group_attrs[] = { | |
508 | &memb_group_attr_features, | |
509 | NULL, | |
510 | }; | |
511 | ||
512 | static struct configfs_group_operations nullb_group_ops = { | |
513 | .make_item = nullb_group_make_item, | |
514 | .drop_item = nullb_group_drop_item, | |
515 | }; | |
516 | ||
e1919dff | 517 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
518 | .ct_group_ops = &nullb_group_ops, |
519 | .ct_attrs = nullb_group_attrs, | |
520 | .ct_owner = THIS_MODULE, | |
521 | }; | |
522 | ||
523 | static struct configfs_subsystem nullb_subsys = { | |
524 | .su_group = { | |
525 | .cg_item = { | |
526 | .ci_namebuf = "nullb", | |
527 | .ci_type = &nullb_group_type, | |
528 | }, | |
529 | }, | |
530 | }; | |
531 | ||
deb78b41 SL |
532 | static inline int null_cache_active(struct nullb *nullb) |
533 | { | |
534 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
535 | } | |
536 | ||
2984c868 SL |
537 | static struct nullb_device *null_alloc_dev(void) |
538 | { | |
539 | struct nullb_device *dev; | |
540 | ||
541 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
542 | if (!dev) | |
543 | return NULL; | |
5bcd0e0c | 544 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 545 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
546 | if (badblocks_init(&dev->badblocks, 0)) { |
547 | kfree(dev); | |
548 | return NULL; | |
549 | } | |
550 | ||
2984c868 SL |
551 | dev->size = g_gb * 1024; |
552 | dev->completion_nsec = g_completion_nsec; | |
553 | dev->submit_queues = g_submit_queues; | |
554 | dev->home_node = g_home_node; | |
555 | dev->queue_mode = g_queue_mode; | |
556 | dev->blocksize = g_bs; | |
557 | dev->irqmode = g_irqmode; | |
558 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 SL |
559 | dev->blocking = g_blocking; |
560 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
ca4b2a01 MB |
561 | dev->zoned = g_zoned; |
562 | dev->zone_size = g_zone_size; | |
ea2c18e1 | 563 | dev->zone_nr_conv = g_zone_nr_conv; |
2984c868 SL |
564 | return dev; |
565 | } | |
566 | ||
567 | static void null_free_dev(struct nullb_device *dev) | |
568 | { | |
1addb798 DD |
569 | if (!dev) |
570 | return; | |
571 | ||
ca4b2a01 | 572 | null_zone_exit(dev); |
1addb798 | 573 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
574 | kfree(dev); |
575 | } | |
576 | ||
f2298c04 JA |
577 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
578 | { | |
579 | clear_bit_unlock(tag, nq->tag_map); | |
580 | ||
581 | if (waitqueue_active(&nq->wait)) | |
582 | wake_up(&nq->wait); | |
583 | } | |
584 | ||
585 | static unsigned int get_tag(struct nullb_queue *nq) | |
586 | { | |
587 | unsigned int tag; | |
588 | ||
589 | do { | |
590 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
591 | if (tag >= nq->queue_depth) | |
592 | return -1U; | |
593 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
594 | ||
595 | return tag; | |
596 | } | |
597 | ||
598 | static void free_cmd(struct nullb_cmd *cmd) | |
599 | { | |
600 | put_tag(cmd->nq, cmd->tag); | |
601 | } | |
602 | ||
3c395a96 PV |
603 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
604 | ||
f2298c04 JA |
605 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
606 | { | |
607 | struct nullb_cmd *cmd; | |
608 | unsigned int tag; | |
609 | ||
610 | tag = get_tag(nq); | |
611 | if (tag != -1U) { | |
612 | cmd = &nq->cmds[tag]; | |
613 | cmd->tag = tag; | |
614 | cmd->nq = nq; | |
2984c868 | 615 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
616 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
617 | HRTIMER_MODE_REL); | |
618 | cmd->timer.function = null_cmd_timer_expired; | |
619 | } | |
f2298c04 JA |
620 | return cmd; |
621 | } | |
622 | ||
623 | return NULL; | |
624 | } | |
625 | ||
626 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
627 | { | |
628 | struct nullb_cmd *cmd; | |
629 | DEFINE_WAIT(wait); | |
630 | ||
631 | cmd = __alloc_cmd(nq); | |
632 | if (cmd || !can_wait) | |
633 | return cmd; | |
634 | ||
635 | do { | |
636 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
637 | cmd = __alloc_cmd(nq); | |
638 | if (cmd) | |
639 | break; | |
640 | ||
641 | io_schedule(); | |
642 | } while (1); | |
643 | ||
644 | finish_wait(&nq->wait, &wait); | |
645 | return cmd; | |
646 | } | |
647 | ||
648 | static void end_cmd(struct nullb_cmd *cmd) | |
649 | { | |
2984c868 | 650 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 651 | |
ce2c350b CH |
652 | switch (queue_mode) { |
653 | case NULL_Q_MQ: | |
5bcd0e0c | 654 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b | 655 | return; |
ce2c350b | 656 | case NULL_Q_BIO: |
5bcd0e0c | 657 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 658 | bio_endio(cmd->bio); |
48cc661e | 659 | break; |
ce2c350b | 660 | } |
f2298c04 | 661 | |
48cc661e | 662 | free_cmd(cmd); |
cf8ecc5a AA |
663 | } |
664 | ||
665 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
666 | { | |
667 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
668 | |
669 | return HRTIMER_NORESTART; | |
670 | } | |
671 | ||
672 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
673 | { | |
2984c868 | 674 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 675 | |
3c395a96 | 676 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
677 | } |
678 | ||
49f66136 | 679 | static void null_complete_rq(struct request *rq) |
f2298c04 | 680 | { |
49f66136 | 681 | end_cmd(blk_mq_rq_to_pdu(rq)); |
f2298c04 JA |
682 | } |
683 | ||
5bcd0e0c SL |
684 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
685 | { | |
686 | struct nullb_page *t_page; | |
687 | ||
688 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
689 | if (!t_page) | |
690 | goto out; | |
691 | ||
692 | t_page->page = alloc_pages(gfp_flags, 0); | |
693 | if (!t_page->page) | |
694 | goto out_freepage; | |
695 | ||
66231ad3 | 696 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
697 | return t_page; |
698 | out_freepage: | |
699 | kfree(t_page); | |
700 | out: | |
701 | return NULL; | |
702 | } | |
703 | ||
704 | static void null_free_page(struct nullb_page *t_page) | |
705 | { | |
66231ad3 ML |
706 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
707 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 708 | return; |
5bcd0e0c SL |
709 | __free_page(t_page->page); |
710 | kfree(t_page); | |
711 | } | |
712 | ||
66231ad3 ML |
713 | static bool null_page_empty(struct nullb_page *page) |
714 | { | |
715 | int size = MAP_SZ - 2; | |
716 | ||
717 | return find_first_bit(page->bitmap, size) == size; | |
718 | } | |
719 | ||
deb78b41 SL |
720 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
721 | bool is_cache) | |
5bcd0e0c SL |
722 | { |
723 | unsigned int sector_bit; | |
724 | u64 idx; | |
725 | struct nullb_page *t_page, *ret; | |
726 | struct radix_tree_root *root; | |
727 | ||
deb78b41 | 728 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
729 | idx = sector >> PAGE_SECTORS_SHIFT; |
730 | sector_bit = (sector & SECTOR_MASK); | |
731 | ||
732 | t_page = radix_tree_lookup(root, idx); | |
733 | if (t_page) { | |
66231ad3 | 734 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 735 | |
66231ad3 | 736 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
737 | ret = radix_tree_delete_item(root, idx, t_page); |
738 | WARN_ON(ret != t_page); | |
739 | null_free_page(ret); | |
deb78b41 SL |
740 | if (is_cache) |
741 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
742 | } |
743 | } | |
744 | } | |
745 | ||
746 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 747 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
748 | { |
749 | struct radix_tree_root *root; | |
750 | ||
deb78b41 | 751 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
752 | |
753 | if (radix_tree_insert(root, idx, t_page)) { | |
754 | null_free_page(t_page); | |
755 | t_page = radix_tree_lookup(root, idx); | |
756 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
757 | } else if (is_cache) |
758 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
759 | |
760 | return t_page; | |
761 | } | |
762 | ||
deb78b41 | 763 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
764 | { |
765 | unsigned long pos = 0; | |
766 | int nr_pages; | |
767 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
768 | struct radix_tree_root *root; | |
769 | ||
deb78b41 | 770 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
771 | |
772 | do { | |
773 | int i; | |
774 | ||
775 | nr_pages = radix_tree_gang_lookup(root, | |
776 | (void **)t_pages, pos, FREE_BATCH); | |
777 | ||
778 | for (i = 0; i < nr_pages; i++) { | |
779 | pos = t_pages[i]->page->index; | |
780 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
781 | WARN_ON(ret != t_pages[i]); | |
782 | null_free_page(ret); | |
783 | } | |
784 | ||
785 | pos++; | |
786 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
787 | |
788 | if (is_cache) | |
789 | dev->curr_cache = 0; | |
5bcd0e0c SL |
790 | } |
791 | ||
deb78b41 SL |
792 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
793 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
794 | { |
795 | unsigned int sector_bit; | |
796 | u64 idx; | |
797 | struct nullb_page *t_page; | |
deb78b41 | 798 | struct radix_tree_root *root; |
5bcd0e0c SL |
799 | |
800 | idx = sector >> PAGE_SECTORS_SHIFT; | |
801 | sector_bit = (sector & SECTOR_MASK); | |
802 | ||
deb78b41 SL |
803 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
804 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
805 | WARN_ON(t_page && t_page->page->index != idx); |
806 | ||
66231ad3 | 807 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
808 | return t_page; |
809 | ||
810 | return NULL; | |
811 | } | |
812 | ||
deb78b41 SL |
813 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
814 | sector_t sector, bool for_write, bool ignore_cache) | |
815 | { | |
816 | struct nullb_page *page = NULL; | |
817 | ||
818 | if (!ignore_cache) | |
819 | page = __null_lookup_page(nullb, sector, for_write, true); | |
820 | if (page) | |
821 | return page; | |
822 | return __null_lookup_page(nullb, sector, for_write, false); | |
823 | } | |
824 | ||
5bcd0e0c | 825 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
826 | sector_t sector, bool ignore_cache) |
827 | __releases(&nullb->lock) | |
828 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
829 | { |
830 | u64 idx; | |
831 | struct nullb_page *t_page; | |
832 | ||
deb78b41 | 833 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
834 | if (t_page) |
835 | return t_page; | |
836 | ||
837 | spin_unlock_irq(&nullb->lock); | |
838 | ||
839 | t_page = null_alloc_page(GFP_NOIO); | |
840 | if (!t_page) | |
841 | goto out_lock; | |
842 | ||
843 | if (radix_tree_preload(GFP_NOIO)) | |
844 | goto out_freepage; | |
845 | ||
846 | spin_lock_irq(&nullb->lock); | |
847 | idx = sector >> PAGE_SECTORS_SHIFT; | |
848 | t_page->page->index = idx; | |
deb78b41 | 849 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
850 | radix_tree_preload_end(); |
851 | ||
852 | return t_page; | |
853 | out_freepage: | |
854 | null_free_page(t_page); | |
855 | out_lock: | |
856 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
857 | return null_lookup_page(nullb, sector, true, ignore_cache); |
858 | } | |
859 | ||
860 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
861 | { | |
862 | int i; | |
863 | unsigned int offset; | |
864 | u64 idx; | |
865 | struct nullb_page *t_page, *ret; | |
866 | void *dst, *src; | |
867 | ||
868 | idx = c_page->page->index; | |
869 | ||
870 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
871 | ||
66231ad3 ML |
872 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
873 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 874 | null_free_page(c_page); |
66231ad3 | 875 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
876 | ret = radix_tree_delete_item(&nullb->dev->data, |
877 | idx, t_page); | |
878 | null_free_page(t_page); | |
879 | } | |
880 | return 0; | |
881 | } | |
882 | ||
883 | if (!t_page) | |
884 | return -ENOMEM; | |
885 | ||
886 | src = kmap_atomic(c_page->page); | |
887 | dst = kmap_atomic(t_page->page); | |
888 | ||
889 | for (i = 0; i < PAGE_SECTORS; | |
890 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 891 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
892 | offset = (i << SECTOR_SHIFT); |
893 | memcpy(dst + offset, src + offset, | |
894 | nullb->dev->blocksize); | |
66231ad3 | 895 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
896 | } |
897 | } | |
898 | ||
899 | kunmap_atomic(dst); | |
900 | kunmap_atomic(src); | |
901 | ||
902 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
903 | null_free_page(ret); | |
904 | nullb->dev->curr_cache -= PAGE_SIZE; | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 910 | { |
deb78b41 SL |
911 | int i, err, nr_pages; |
912 | struct nullb_page *c_pages[FREE_BATCH]; | |
913 | unsigned long flushed = 0, one_round; | |
914 | ||
915 | again: | |
916 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
917 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
918 | return 0; | |
919 | ||
920 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
921 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
922 | /* | |
923 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
924 | * avoid race, we don't allow page free | |
925 | */ | |
926 | for (i = 0; i < nr_pages; i++) { | |
927 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
928 | /* | |
929 | * We found the page which is being flushed to disk by other | |
930 | * threads | |
931 | */ | |
66231ad3 | 932 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
933 | c_pages[i] = NULL; |
934 | else | |
66231ad3 | 935 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
936 | } |
937 | ||
938 | one_round = 0; | |
939 | for (i = 0; i < nr_pages; i++) { | |
940 | if (c_pages[i] == NULL) | |
941 | continue; | |
942 | err = null_flush_cache_page(nullb, c_pages[i]); | |
943 | if (err) | |
944 | return err; | |
945 | one_round++; | |
946 | } | |
947 | flushed += one_round << PAGE_SHIFT; | |
948 | ||
949 | if (n > flushed) { | |
950 | if (nr_pages == 0) | |
951 | nullb->cache_flush_pos = 0; | |
952 | if (one_round == 0) { | |
953 | /* give other threads a chance */ | |
954 | spin_unlock_irq(&nullb->lock); | |
955 | spin_lock_irq(&nullb->lock); | |
956 | } | |
957 | goto again; | |
958 | } | |
959 | return 0; | |
5bcd0e0c SL |
960 | } |
961 | ||
962 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 963 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
964 | { |
965 | size_t temp, count = 0; | |
966 | unsigned int offset; | |
967 | struct nullb_page *t_page; | |
968 | void *dst, *src; | |
969 | ||
970 | while (count < n) { | |
971 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
972 | ||
deb78b41 SL |
973 | if (null_cache_active(nullb) && !is_fua) |
974 | null_make_cache_space(nullb, PAGE_SIZE); | |
975 | ||
5bcd0e0c | 976 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
977 | t_page = null_insert_page(nullb, sector, |
978 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
979 | if (!t_page) |
980 | return -ENOSPC; | |
981 | ||
982 | src = kmap_atomic(source); | |
983 | dst = kmap_atomic(t_page->page); | |
984 | memcpy(dst + offset, src + off + count, temp); | |
985 | kunmap_atomic(dst); | |
986 | kunmap_atomic(src); | |
987 | ||
66231ad3 | 988 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 989 | |
deb78b41 SL |
990 | if (is_fua) |
991 | null_free_sector(nullb, sector, true); | |
992 | ||
5bcd0e0c SL |
993 | count += temp; |
994 | sector += temp >> SECTOR_SHIFT; | |
995 | } | |
996 | return 0; | |
997 | } | |
998 | ||
999 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1000 | unsigned int off, sector_t sector, size_t n) | |
1001 | { | |
1002 | size_t temp, count = 0; | |
1003 | unsigned int offset; | |
1004 | struct nullb_page *t_page; | |
1005 | void *dst, *src; | |
1006 | ||
1007 | while (count < n) { | |
1008 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1009 | ||
1010 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1011 | t_page = null_lookup_page(nullb, sector, false, |
1012 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
1013 | |
1014 | dst = kmap_atomic(dest); | |
1015 | if (!t_page) { | |
1016 | memset(dst + off + count, 0, temp); | |
1017 | goto next; | |
1018 | } | |
1019 | src = kmap_atomic(t_page->page); | |
1020 | memcpy(dst + off + count, src + offset, temp); | |
1021 | kunmap_atomic(src); | |
1022 | next: | |
1023 | kunmap_atomic(dst); | |
1024 | ||
1025 | count += temp; | |
1026 | sector += temp >> SECTOR_SHIFT; | |
1027 | } | |
1028 | return 0; | |
1029 | } | |
1030 | ||
dd85b492 AJ |
1031 | static void nullb_fill_pattern(struct nullb *nullb, struct page *page, |
1032 | unsigned int len, unsigned int off) | |
1033 | { | |
1034 | void *dst; | |
1035 | ||
1036 | dst = kmap_atomic(page); | |
1037 | memset(dst + off, 0xFF, len); | |
1038 | kunmap_atomic(dst); | |
1039 | } | |
1040 | ||
306eb6b4 SL |
1041 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
1042 | { | |
1043 | size_t temp; | |
1044 | ||
1045 | spin_lock_irq(&nullb->lock); | |
1046 | while (n > 0) { | |
1047 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1048 | null_free_sector(nullb, sector, false); |
1049 | if (null_cache_active(nullb)) | |
1050 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1051 | sector += temp >> SECTOR_SHIFT; |
1052 | n -= temp; | |
1053 | } | |
1054 | spin_unlock_irq(&nullb->lock); | |
1055 | } | |
1056 | ||
deb78b41 SL |
1057 | static int null_handle_flush(struct nullb *nullb) |
1058 | { | |
1059 | int err; | |
1060 | ||
1061 | if (!null_cache_active(nullb)) | |
1062 | return 0; | |
1063 | ||
1064 | spin_lock_irq(&nullb->lock); | |
1065 | while (true) { | |
1066 | err = null_make_cache_space(nullb, | |
1067 | nullb->dev->cache_size * 1024 * 1024); | |
1068 | if (err || nullb->dev->curr_cache == 0) | |
1069 | break; | |
1070 | } | |
1071 | ||
1072 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1073 | spin_unlock_irq(&nullb->lock); | |
1074 | return err; | |
1075 | } | |
1076 | ||
5bcd0e0c | 1077 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1078 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1079 | bool is_fua) | |
f2298c04 | 1080 | { |
dd85b492 AJ |
1081 | struct nullb_device *dev = nullb->dev; |
1082 | unsigned int valid_len = len; | |
5bcd0e0c SL |
1083 | int err = 0; |
1084 | ||
1085 | if (!is_write) { | |
dd85b492 AJ |
1086 | if (dev->zoned) |
1087 | valid_len = null_zone_valid_read_len(nullb, | |
1088 | sector, len); | |
1089 | ||
1090 | if (valid_len) { | |
1091 | err = copy_from_nullb(nullb, page, off, | |
1092 | sector, valid_len); | |
1093 | off += valid_len; | |
1094 | len -= valid_len; | |
1095 | } | |
1096 | ||
1097 | if (len) | |
1098 | nullb_fill_pattern(nullb, page, len, off); | |
5bcd0e0c SL |
1099 | flush_dcache_page(page); |
1100 | } else { | |
1101 | flush_dcache_page(page); | |
deb78b41 | 1102 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1103 | } |
1104 | ||
1105 | return err; | |
1106 | } | |
1107 | ||
1108 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1109 | { | |
1110 | struct request *rq = cmd->rq; | |
1111 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1112 | int err; | |
1113 | unsigned int len; | |
1114 | sector_t sector; | |
1115 | struct req_iterator iter; | |
1116 | struct bio_vec bvec; | |
1117 | ||
1118 | sector = blk_rq_pos(rq); | |
1119 | ||
306eb6b4 SL |
1120 | if (req_op(rq) == REQ_OP_DISCARD) { |
1121 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1122 | return 0; | |
1123 | } | |
1124 | ||
5bcd0e0c SL |
1125 | spin_lock_irq(&nullb->lock); |
1126 | rq_for_each_segment(bvec, rq, iter) { | |
1127 | len = bvec.bv_len; | |
1128 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1129 | op_is_write(req_op(rq)), sector, |
1130 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1131 | if (err) { |
1132 | spin_unlock_irq(&nullb->lock); | |
1133 | return err; | |
1134 | } | |
1135 | sector += len >> SECTOR_SHIFT; | |
1136 | } | |
1137 | spin_unlock_irq(&nullb->lock); | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1143 | { | |
1144 | struct bio *bio = cmd->bio; | |
1145 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1146 | int err; | |
1147 | unsigned int len; | |
1148 | sector_t sector; | |
1149 | struct bio_vec bvec; | |
1150 | struct bvec_iter iter; | |
1151 | ||
1152 | sector = bio->bi_iter.bi_sector; | |
1153 | ||
306eb6b4 SL |
1154 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1155 | null_handle_discard(nullb, sector, | |
1156 | bio_sectors(bio) << SECTOR_SHIFT); | |
1157 | return 0; | |
1158 | } | |
1159 | ||
5bcd0e0c SL |
1160 | spin_lock_irq(&nullb->lock); |
1161 | bio_for_each_segment(bvec, bio, iter) { | |
1162 | len = bvec.bv_len; | |
1163 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1164 | op_is_write(bio_op(bio)), sector, |
bf7c7a04 | 1165 | bio->bi_opf & REQ_FUA); |
5bcd0e0c SL |
1166 | if (err) { |
1167 | spin_unlock_irq(&nullb->lock); | |
1168 | return err; | |
1169 | } | |
1170 | sector += len >> SECTOR_SHIFT; | |
1171 | } | |
1172 | spin_unlock_irq(&nullb->lock); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
eff2c4f1 SL |
1176 | static void null_stop_queue(struct nullb *nullb) |
1177 | { | |
1178 | struct request_queue *q = nullb->q; | |
1179 | ||
1180 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1181 | blk_mq_stop_hw_queues(q); | |
eff2c4f1 SL |
1182 | } |
1183 | ||
1184 | static void null_restart_queue_async(struct nullb *nullb) | |
1185 | { | |
1186 | struct request_queue *q = nullb->q; | |
eff2c4f1 SL |
1187 | |
1188 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1189 | blk_mq_start_stopped_hw_queues(q, true); | |
eff2c4f1 SL |
1190 | } |
1191 | ||
adb84284 CK |
1192 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
1193 | { | |
1194 | struct nullb_device *dev = cmd->nq->dev; | |
1195 | struct nullb *nullb = dev->nullb; | |
1196 | blk_status_t sts = BLK_STS_OK; | |
1197 | struct request *rq = cmd->rq; | |
1198 | ||
1199 | if (!hrtimer_active(&nullb->bw_timer)) | |
1200 | hrtimer_restart(&nullb->bw_timer); | |
1201 | ||
1202 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { | |
1203 | null_stop_queue(nullb); | |
1204 | /* race with timer */ | |
1205 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1206 | null_restart_queue_async(nullb); | |
1207 | /* requeue request */ | |
1208 | sts = BLK_STS_DEV_RESOURCE; | |
1209 | } | |
1210 | return sts; | |
1211 | } | |
1212 | ||
8f94d1c1 CK |
1213 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
1214 | sector_t sector, | |
1215 | sector_t nr_sectors) | |
1216 | { | |
1217 | struct badblocks *bb = &cmd->nq->dev->badblocks; | |
1218 | sector_t first_bad; | |
1219 | int bad_sectors; | |
1220 | ||
1221 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) | |
1222 | return BLK_STS_IOERR; | |
1223 | ||
1224 | return BLK_STS_OK; | |
1225 | } | |
1226 | ||
7ea88e22 CK |
1227 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
1228 | enum req_opf op) | |
1229 | { | |
1230 | struct nullb_device *dev = cmd->nq->dev; | |
1231 | int err; | |
1232 | ||
1233 | if (dev->queue_mode == NULL_Q_BIO) | |
1234 | err = null_handle_bio(cmd); | |
1235 | else | |
1236 | err = null_handle_rq(cmd); | |
1237 | ||
1238 | return errno_to_blk_status(err); | |
1239 | } | |
1240 | ||
a3d7d674 CK |
1241 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
1242 | { | |
1243 | /* Complete IO by inline, softirq or timer */ | |
1244 | switch (cmd->nq->dev->irqmode) { | |
1245 | case NULL_IRQ_SOFTIRQ: | |
1246 | switch (cmd->nq->dev->queue_mode) { | |
1247 | case NULL_Q_MQ: | |
1248 | blk_mq_complete_request(cmd->rq); | |
1249 | break; | |
1250 | case NULL_Q_BIO: | |
1251 | /* | |
1252 | * XXX: no proper submitting cpu information available. | |
1253 | */ | |
1254 | end_cmd(cmd); | |
1255 | break; | |
1256 | } | |
1257 | break; | |
1258 | case NULL_IRQ_NONE: | |
1259 | end_cmd(cmd); | |
1260 | break; | |
1261 | case NULL_IRQ_TIMER: | |
1262 | null_cmd_end_timer(cmd); | |
1263 | break; | |
1264 | } | |
1265 | } | |
1266 | ||
d4b186ed CK |
1267 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
1268 | sector_t nr_sectors, enum req_opf op) | |
5bcd0e0c SL |
1269 | { |
1270 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1271 | struct nullb *nullb = dev->nullb; |
adb84284 | 1272 | blk_status_t sts; |
5bcd0e0c | 1273 | |
eff2c4f1 | 1274 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
adb84284 CK |
1275 | sts = null_handle_throttled(cmd); |
1276 | if (sts != BLK_STS_OK) | |
1277 | return sts; | |
eff2c4f1 SL |
1278 | } |
1279 | ||
d4b186ed CK |
1280 | if (op == REQ_OP_FLUSH) { |
1281 | cmd->error = errno_to_blk_status(null_handle_flush(nullb)); | |
1282 | goto out; | |
1283 | } | |
d4b186ed | 1284 | |
8f94d1c1 CK |
1285 | if (nullb->dev->badblocks.shift != -1) { |
1286 | cmd->error = null_handle_badblocks(cmd, sector, nr_sectors); | |
1287 | if (cmd->error != BLK_STS_OK) | |
2f54a613 | 1288 | goto out; |
2f54a613 SL |
1289 | } |
1290 | ||
7ea88e22 CK |
1291 | if (dev->memory_backed) |
1292 | cmd->error = null_handle_memory_backed(cmd, op); | |
ca4b2a01 | 1293 | |
fceb5d1b CK |
1294 | if (!cmd->error && dev->zoned) |
1295 | cmd->error = null_handle_zoned(cmd, op, sector, nr_sectors); | |
1296 | ||
2f54a613 | 1297 | out: |
a3d7d674 | 1298 | nullb_complete_cmd(cmd); |
5bcd0e0c | 1299 | return BLK_STS_OK; |
f2298c04 JA |
1300 | } |
1301 | ||
eff2c4f1 SL |
1302 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1303 | { | |
1304 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1305 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1306 | unsigned int mbps = nullb->dev->mbps; | |
1307 | ||
1308 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1309 | return HRTIMER_NORESTART; | |
1310 | ||
1311 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1312 | null_restart_queue_async(nullb); | |
1313 | ||
1314 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1315 | ||
1316 | return HRTIMER_RESTART; | |
1317 | } | |
1318 | ||
1319 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1320 | { | |
1321 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1322 | ||
1323 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1324 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1325 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1326 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1327 | } |
1328 | ||
1329 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1330 | { | |
1331 | int index = 0; | |
1332 | ||
1333 | if (nullb->nr_queues != 1) | |
1334 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1335 | ||
1336 | return &nullb->queues[index]; | |
1337 | } | |
1338 | ||
dece1635 | 1339 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 | 1340 | { |
d4b186ed CK |
1341 | sector_t sector = bio->bi_iter.bi_sector; |
1342 | sector_t nr_sectors = bio_sectors(bio); | |
f2298c04 JA |
1343 | struct nullb *nullb = q->queuedata; |
1344 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1345 | struct nullb_cmd *cmd; | |
1346 | ||
1347 | cmd = alloc_cmd(nq, 1); | |
1348 | cmd->bio = bio; | |
1349 | ||
d4b186ed | 1350 | null_handle_cmd(cmd, sector, nr_sectors, bio_op(bio)); |
dece1635 | 1351 | return BLK_QC_T_NONE; |
f2298c04 JA |
1352 | } |
1353 | ||
93b57046 JA |
1354 | static bool should_timeout_request(struct request *rq) |
1355 | { | |
33f782c4 | 1356 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 JA |
1357 | if (g_timeout_str[0]) |
1358 | return should_fail(&null_timeout_attr, 1); | |
33f782c4 | 1359 | #endif |
24941b90 JA |
1360 | return false; |
1361 | } | |
93b57046 | 1362 | |
24941b90 JA |
1363 | static bool should_requeue_request(struct request *rq) |
1364 | { | |
1365 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1366 | if (g_requeue_str[0]) | |
1367 | return should_fail(&null_requeue_attr, 1); | |
1368 | #endif | |
93b57046 JA |
1369 | return false; |
1370 | } | |
1371 | ||
5448aca4 JA |
1372 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res) |
1373 | { | |
9c7eddf1 | 1374 | pr_info("rq %p timed out\n", rq); |
0df0bb08 CH |
1375 | blk_mq_complete_request(rq); |
1376 | return BLK_EH_DONE; | |
5448aca4 JA |
1377 | } |
1378 | ||
fc17b653 | 1379 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1380 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1381 | { |
74c45052 | 1382 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1383 | struct nullb_queue *nq = hctx->driver_data; |
d4b186ed CK |
1384 | sector_t nr_sectors = blk_rq_sectors(bd->rq); |
1385 | sector_t sector = blk_rq_pos(bd->rq); | |
f2298c04 | 1386 | |
db5bcf87 JA |
1387 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1388 | ||
2984c868 | 1389 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1390 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1391 | cmd->timer.function = null_cmd_timer_expired; | |
1392 | } | |
74c45052 | 1393 | cmd->rq = bd->rq; |
2984c868 | 1394 | cmd->nq = nq; |
f2298c04 | 1395 | |
74c45052 | 1396 | blk_mq_start_request(bd->rq); |
e2490073 | 1397 | |
24941b90 JA |
1398 | if (should_requeue_request(bd->rq)) { |
1399 | /* | |
1400 | * Alternate between hitting the core BUSY path, and the | |
1401 | * driver driven requeue path | |
1402 | */ | |
1403 | nq->requeue_selection++; | |
1404 | if (nq->requeue_selection & 1) | |
1405 | return BLK_STS_RESOURCE; | |
1406 | else { | |
1407 | blk_mq_requeue_request(bd->rq, true); | |
1408 | return BLK_STS_OK; | |
1409 | } | |
1410 | } | |
1411 | if (should_timeout_request(bd->rq)) | |
1412 | return BLK_STS_OK; | |
93b57046 | 1413 | |
d4b186ed | 1414 | return null_handle_cmd(cmd, sector, nr_sectors, req_op(bd->rq)); |
f2298c04 JA |
1415 | } |
1416 | ||
de65d2d2 MB |
1417 | static void cleanup_queue(struct nullb_queue *nq) |
1418 | { | |
1419 | kfree(nq->tag_map); | |
1420 | kfree(nq->cmds); | |
1421 | } | |
1422 | ||
1423 | static void cleanup_queues(struct nullb *nullb) | |
1424 | { | |
1425 | int i; | |
1426 | ||
1427 | for (i = 0; i < nullb->nr_queues; i++) | |
1428 | cleanup_queue(&nullb->queues[i]); | |
1429 | ||
1430 | kfree(nullb->queues); | |
1431 | } | |
1432 | ||
78b10be2 BVA |
1433 | static void null_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
1434 | { | |
1435 | struct nullb_queue *nq = hctx->driver_data; | |
1436 | struct nullb *nullb = nq->dev->nullb; | |
1437 | ||
1438 | nullb->nr_queues--; | |
1439 | } | |
1440 | ||
1441 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) | |
1442 | { | |
1443 | init_waitqueue_head(&nq->wait); | |
1444 | nq->queue_depth = nullb->queue_depth; | |
1445 | nq->dev = nullb->dev; | |
1446 | } | |
1447 | ||
1448 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, | |
1449 | unsigned int hctx_idx) | |
1450 | { | |
1451 | struct nullb *nullb = hctx->queue->queuedata; | |
1452 | struct nullb_queue *nq; | |
1453 | ||
1454 | nq = &nullb->queues[hctx_idx]; | |
1455 | hctx->driver_data = nq; | |
1456 | null_init_queue(nullb, nq); | |
1457 | nullb->nr_queues++; | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | static const struct blk_mq_ops null_mq_ops = { | |
1463 | .queue_rq = null_queue_rq, | |
1464 | .complete = null_complete_rq, | |
1465 | .timeout = null_timeout_rq, | |
1466 | .init_hctx = null_init_hctx, | |
1467 | .exit_hctx = null_exit_hctx, | |
1468 | }; | |
1469 | ||
9ae2d0aa MB |
1470 | static void null_del_dev(struct nullb *nullb) |
1471 | { | |
9b03b713 BVA |
1472 | struct nullb_device *dev; |
1473 | ||
1474 | if (!nullb) | |
1475 | return; | |
1476 | ||
1477 | dev = nullb->dev; | |
2984c868 | 1478 | |
94bc02e3 SL |
1479 | ida_simple_remove(&nullb_indexes, nullb->index); |
1480 | ||
9ae2d0aa MB |
1481 | list_del_init(&nullb->list); |
1482 | ||
74ede5af | 1483 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1484 | |
1485 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1486 | hrtimer_cancel(&nullb->bw_timer); | |
1487 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1488 | null_restart_queue_async(nullb); | |
1489 | } | |
1490 | ||
9ae2d0aa | 1491 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1492 | if (dev->queue_mode == NULL_Q_MQ && |
1493 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1494 | blk_mq_free_tag_set(nullb->tag_set); |
74ede5af | 1495 | put_disk(nullb->disk); |
9ae2d0aa | 1496 | cleanup_queues(nullb); |
deb78b41 SL |
1497 | if (null_cache_active(nullb)) |
1498 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1499 | kfree(nullb); |
2984c868 | 1500 | dev->nullb = NULL; |
9ae2d0aa MB |
1501 | } |
1502 | ||
306eb6b4 SL |
1503 | static void null_config_discard(struct nullb *nullb) |
1504 | { | |
1505 | if (nullb->dev->discard == false) | |
1506 | return; | |
1507 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1508 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1509 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
8b904b5b | 1510 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q); |
9ae2d0aa MB |
1511 | } |
1512 | ||
e3f89564 CH |
1513 | static const struct block_device_operations null_ops = { |
1514 | .owner = THIS_MODULE, | |
7fc8fb51 | 1515 | .report_zones = null_report_zones, |
f2298c04 JA |
1516 | }; |
1517 | ||
1518 | static int setup_commands(struct nullb_queue *nq) | |
1519 | { | |
1520 | struct nullb_cmd *cmd; | |
1521 | int i, tag_size; | |
1522 | ||
6396bb22 | 1523 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
f2298c04 | 1524 | if (!nq->cmds) |
2d263a78 | 1525 | return -ENOMEM; |
f2298c04 JA |
1526 | |
1527 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
6396bb22 | 1528 | nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL); |
f2298c04 JA |
1529 | if (!nq->tag_map) { |
1530 | kfree(nq->cmds); | |
2d263a78 | 1531 | return -ENOMEM; |
f2298c04 JA |
1532 | } |
1533 | ||
1534 | for (i = 0; i < nq->queue_depth; i++) { | |
1535 | cmd = &nq->cmds[i]; | |
f2298c04 JA |
1536 | cmd->tag = -1U; |
1537 | } | |
1538 | ||
1539 | return 0; | |
1540 | } | |
1541 | ||
f2298c04 JA |
1542 | static int setup_queues(struct nullb *nullb) |
1543 | { | |
78b10be2 | 1544 | nullb->queues = kcalloc(nr_cpu_ids, sizeof(struct nullb_queue), |
6396bb22 | 1545 | GFP_KERNEL); |
f2298c04 | 1546 | if (!nullb->queues) |
2d263a78 | 1547 | return -ENOMEM; |
f2298c04 | 1548 | |
2984c868 | 1549 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1550 | |
2d263a78 MB |
1551 | return 0; |
1552 | } | |
1553 | ||
1554 | static int init_driver_queues(struct nullb *nullb) | |
1555 | { | |
1556 | struct nullb_queue *nq; | |
1557 | int i, ret = 0; | |
f2298c04 | 1558 | |
2984c868 | 1559 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1560 | nq = &nullb->queues[i]; |
2d263a78 MB |
1561 | |
1562 | null_init_queue(nullb, nq); | |
1563 | ||
1564 | ret = setup_commands(nq); | |
1565 | if (ret) | |
31f9690e | 1566 | return ret; |
f2298c04 JA |
1567 | nullb->nr_queues++; |
1568 | } | |
2d263a78 | 1569 | return 0; |
f2298c04 JA |
1570 | } |
1571 | ||
9ae2d0aa | 1572 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 | 1573 | { |
979d5447 | 1574 | sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT; |
f2298c04 | 1575 | struct gendisk *disk; |
9ae2d0aa | 1576 | |
2984c868 | 1577 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1578 | if (!disk) |
1579 | return -ENOMEM; | |
979d5447 | 1580 | set_capacity(disk, size); |
9ae2d0aa MB |
1581 | |
1582 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1583 | disk->major = null_major; | |
1584 | disk->first_minor = nullb->index; | |
e3f89564 | 1585 | disk->fops = &null_ops; |
9ae2d0aa MB |
1586 | disk->private_data = nullb; |
1587 | disk->queue = nullb->q; | |
1588 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1589 | ||
ae58954d | 1590 | #ifdef CONFIG_BLK_DEV_ZONED |
bf505456 | 1591 | if (nullb->dev->zoned) { |
ae58954d | 1592 | if (queue_is_mq(nullb->q)) { |
bca1c43c | 1593 | int ret = blk_revalidate_disk_zones(disk); |
ae58954d CH |
1594 | if (ret) |
1595 | return ret; | |
1596 | } else { | |
6c6b3549 CH |
1597 | blk_queue_chunk_sectors(nullb->q, |
1598 | nullb->dev->zone_size_sects); | |
ae58954d CH |
1599 | nullb->q->nr_zones = blkdev_nr_zones(disk); |
1600 | } | |
bf505456 | 1601 | } |
ae58954d | 1602 | #endif |
bf505456 | 1603 | |
9ae2d0aa MB |
1604 | add_disk(disk); |
1605 | return 0; | |
1606 | } | |
1607 | ||
2984c868 | 1608 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1609 | { |
1610 | set->ops = &null_mq_ops; | |
2984c868 SL |
1611 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1612 | g_submit_queues; | |
1613 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1614 | g_hw_queue_depth; | |
1615 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1616 | set->cmd_size = sizeof(struct nullb_cmd); |
1617 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1618 | if (g_no_sched) |
1619 | set->flags |= BLK_MQ_F_NO_SCHED; | |
82f402fe JA |
1620 | set->driver_data = NULL; |
1621 | ||
0d06a42f | 1622 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1623 | set->flags |= BLK_MQ_F_BLOCKING; |
1624 | ||
1625 | return blk_mq_alloc_tag_set(set); | |
1626 | } | |
1627 | ||
5c4bd1f4 | 1628 | static int null_validate_conf(struct nullb_device *dev) |
cedcafad SL |
1629 | { |
1630 | dev->blocksize = round_down(dev->blocksize, 512); | |
1631 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad SL |
1632 | |
1633 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1634 | if (dev->submit_queues != nr_online_nodes) | |
1635 | dev->submit_queues = nr_online_nodes; | |
1636 | } else if (dev->submit_queues > nr_cpu_ids) | |
1637 | dev->submit_queues = nr_cpu_ids; | |
1638 | else if (dev->submit_queues == 0) | |
1639 | dev->submit_queues = 1; | |
1640 | ||
1641 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1642 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1643 | |
1644 | /* Do memory allocation, so set blocking */ | |
1645 | if (dev->memory_backed) | |
1646 | dev->blocking = true; | |
deb78b41 SL |
1647 | else /* cache is meaningless */ |
1648 | dev->cache_size = 0; | |
1649 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1650 | dev->cache_size); | |
eff2c4f1 SL |
1651 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1652 | /* can not stop a queue */ | |
1653 | if (dev->queue_mode == NULL_Q_BIO) | |
1654 | dev->mbps = 0; | |
5c4bd1f4 DLM |
1655 | |
1656 | if (dev->zoned && | |
1657 | (!dev->zone_size || !is_power_of_2(dev->zone_size))) { | |
1658 | pr_err("zone_size must be power-of-two\n"); | |
1659 | return -EINVAL; | |
1660 | } | |
1661 | ||
1662 | return 0; | |
cedcafad SL |
1663 | } |
1664 | ||
33f782c4 | 1665 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1666 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1667 | { | |
1668 | if (!str[0]) | |
93b57046 JA |
1669 | return true; |
1670 | ||
24941b90 | 1671 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1672 | return false; |
1673 | ||
24941b90 JA |
1674 | attr->verbose = 0; |
1675 | return true; | |
1676 | } | |
1677 | #endif | |
1678 | ||
1679 | static bool null_setup_fault(void) | |
1680 | { | |
1681 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1682 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1683 | return false; | |
1684 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1685 | return false; | |
33f782c4 | 1686 | #endif |
93b57046 JA |
1687 | return true; |
1688 | } | |
1689 | ||
78b10be2 BVA |
1690 | /* |
1691 | * This function is identical to blk_mq_init_queue() except that it sets | |
1692 | * queuedata before .init_hctx is called. | |
1693 | */ | |
1694 | static struct request_queue *nullb_alloc_queue(struct nullb *nullb) | |
1695 | { | |
1696 | struct request_queue *uninit_q, *q; | |
1697 | struct blk_mq_tag_set *set = nullb->tag_set; | |
1698 | ||
1699 | uninit_q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node); | |
1700 | if (!uninit_q) | |
1701 | return ERR_PTR(-ENOMEM); | |
1702 | ||
1703 | uninit_q->queuedata = nullb; | |
1704 | q = blk_mq_init_allocated_queue(set, uninit_q, false); | |
1705 | if (IS_ERR(q)) | |
1706 | blk_cleanup_queue(uninit_q); | |
1707 | ||
1708 | return q; | |
1709 | } | |
1710 | ||
2984c868 | 1711 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1712 | { |
1713 | struct nullb *nullb; | |
dc501dc0 | 1714 | int rv; |
f2298c04 | 1715 | |
5c4bd1f4 DLM |
1716 | rv = null_validate_conf(dev); |
1717 | if (rv) | |
1718 | return rv; | |
cedcafad | 1719 | |
2984c868 | 1720 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1721 | if (!nullb) { |
1722 | rv = -ENOMEM; | |
24d2f903 | 1723 | goto out; |
dc501dc0 | 1724 | } |
2984c868 SL |
1725 | nullb->dev = dev; |
1726 | dev->nullb = nullb; | |
f2298c04 JA |
1727 | |
1728 | spin_lock_init(&nullb->lock); | |
1729 | ||
dc501dc0 RE |
1730 | rv = setup_queues(nullb); |
1731 | if (rv) | |
24d2f903 | 1732 | goto out_free_nullb; |
f2298c04 | 1733 | |
2984c868 | 1734 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1735 | if (shared_tags) { |
1736 | nullb->tag_set = &tag_set; | |
1737 | rv = 0; | |
1738 | } else { | |
1739 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1740 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1741 | } |
1742 | ||
dc501dc0 | 1743 | if (rv) |
24d2f903 CH |
1744 | goto out_cleanup_queues; |
1745 | ||
93b57046 JA |
1746 | if (!null_setup_fault()) |
1747 | goto out_cleanup_queues; | |
1748 | ||
5448aca4 | 1749 | nullb->tag_set->timeout = 5 * HZ; |
78b10be2 | 1750 | nullb->q = nullb_alloc_queue(nullb); |
35b489d3 | 1751 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1752 | rv = -ENOMEM; |
24d2f903 | 1753 | goto out_cleanup_tags; |
dc501dc0 | 1754 | } |
2984c868 | 1755 | } else if (dev->queue_mode == NULL_Q_BIO) { |
6d469642 | 1756 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1757 | if (!nullb->q) { |
1758 | rv = -ENOMEM; | |
24d2f903 | 1759 | goto out_cleanup_queues; |
dc501dc0 | 1760 | } |
f2298c04 | 1761 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1762 | rv = init_driver_queues(nullb); |
1763 | if (rv) | |
1764 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1765 | } |
1766 | ||
eff2c4f1 SL |
1767 | if (dev->mbps) { |
1768 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1769 | nullb_setup_bwtimer(nullb); | |
1770 | } | |
1771 | ||
deb78b41 SL |
1772 | if (dev->cache_size > 0) { |
1773 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1774 | blk_queue_write_cache(nullb->q, true, true); | |
deb78b41 SL |
1775 | } |
1776 | ||
ca4b2a01 MB |
1777 | if (dev->zoned) { |
1778 | rv = null_zone_init(dev); | |
1779 | if (rv) | |
1780 | goto out_cleanup_blk_queue; | |
1781 | ||
ca4b2a01 | 1782 | nullb->q->limits.zoned = BLK_ZONED_HM; |
a61dbfb1 | 1783 | blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, nullb->q); |
780d97a9 DLM |
1784 | blk_queue_required_elevator_features(nullb->q, |
1785 | ELEVATOR_F_ZBD_SEQ_WRITE); | |
ca4b2a01 MB |
1786 | } |
1787 | ||
f2298c04 | 1788 | nullb->q->queuedata = nullb; |
8b904b5b BVA |
1789 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
1790 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); | |
f2298c04 | 1791 | |
f2298c04 | 1792 | mutex_lock(&lock); |
94bc02e3 | 1793 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1794 | dev->index = nullb->index; |
f2298c04 JA |
1795 | mutex_unlock(&lock); |
1796 | ||
2984c868 SL |
1797 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1798 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1799 | |
306eb6b4 | 1800 | null_config_discard(nullb); |
f2298c04 | 1801 | |
b2b7e001 MB |
1802 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1803 | ||
74ede5af | 1804 | rv = null_gendisk_register(nullb); |
9ae2d0aa | 1805 | if (rv) |
ca4b2a01 | 1806 | goto out_cleanup_zone; |
a514379b MB |
1807 | |
1808 | mutex_lock(&lock); | |
1809 | list_add_tail(&nullb->list, &nullb_list); | |
1810 | mutex_unlock(&lock); | |
3681c85d | 1811 | |
f2298c04 | 1812 | return 0; |
ca4b2a01 MB |
1813 | out_cleanup_zone: |
1814 | if (dev->zoned) | |
1815 | null_zone_exit(dev); | |
24d2f903 CH |
1816 | out_cleanup_blk_queue: |
1817 | blk_cleanup_queue(nullb->q); | |
1818 | out_cleanup_tags: | |
2984c868 | 1819 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1820 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1821 | out_cleanup_queues: |
1822 | cleanup_queues(nullb); | |
1823 | out_free_nullb: | |
1824 | kfree(nullb); | |
2004bfde | 1825 | dev->nullb = NULL; |
24d2f903 | 1826 | out: |
dc501dc0 | 1827 | return rv; |
f2298c04 JA |
1828 | } |
1829 | ||
1830 | static int __init null_init(void) | |
1831 | { | |
af096e22 | 1832 | int ret = 0; |
f2298c04 | 1833 | unsigned int i; |
af096e22 | 1834 | struct nullb *nullb; |
2984c868 | 1835 | struct nullb_device *dev; |
f2298c04 | 1836 | |
2984c868 | 1837 | if (g_bs > PAGE_SIZE) { |
9c7eddf1 AA |
1838 | pr_warn("invalid block size\n"); |
1839 | pr_warn("defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1840 | g_bs = PAGE_SIZE; |
9967d8ac | 1841 | } |
f2298c04 | 1842 | |
7ff684a6 | 1843 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
9c7eddf1 | 1844 | pr_err("invalid home_node value\n"); |
7ff684a6 JP |
1845 | g_home_node = NUMA_NO_NODE; |
1846 | } | |
1847 | ||
e50b1e32 | 1848 | if (g_queue_mode == NULL_Q_RQ) { |
9c7eddf1 | 1849 | pr_err("legacy IO path no longer available\n"); |
e50b1e32 JA |
1850 | return -EINVAL; |
1851 | } | |
2984c868 SL |
1852 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1853 | if (g_submit_queues != nr_online_nodes) { | |
9c7eddf1 | 1854 | pr_warn("submit_queues param is set to %u.\n", |
d15ee6b1 | 1855 | nr_online_nodes); |
2984c868 | 1856 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1857 | } |
2984c868 SL |
1858 | } else if (g_submit_queues > nr_cpu_ids) |
1859 | g_submit_queues = nr_cpu_ids; | |
1860 | else if (g_submit_queues <= 0) | |
1861 | g_submit_queues = 1; | |
f2298c04 | 1862 | |
2984c868 SL |
1863 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1864 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1865 | if (ret) |
1866 | return ret; | |
1867 | } | |
1868 | ||
3bf2bd20 SL |
1869 | config_group_init(&nullb_subsys.su_group); |
1870 | mutex_init(&nullb_subsys.su_mutex); | |
1871 | ||
1872 | ret = configfs_register_subsystem(&nullb_subsys); | |
1873 | if (ret) | |
1874 | goto err_tagset; | |
1875 | ||
f2298c04 JA |
1876 | mutex_init(&lock); |
1877 | ||
f2298c04 | 1878 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1879 | if (null_major < 0) { |
1880 | ret = null_major; | |
3bf2bd20 | 1881 | goto err_conf; |
db2d153d | 1882 | } |
f2298c04 JA |
1883 | |
1884 | for (i = 0; i < nr_devices; i++) { | |
2984c868 | 1885 | dev = null_alloc_dev(); |
30c516d7 WY |
1886 | if (!dev) { |
1887 | ret = -ENOMEM; | |
2984c868 | 1888 | goto err_dev; |
30c516d7 | 1889 | } |
2984c868 SL |
1890 | ret = null_add_dev(dev); |
1891 | if (ret) { | |
1892 | null_free_dev(dev); | |
af096e22 | 1893 | goto err_dev; |
2984c868 | 1894 | } |
f2298c04 JA |
1895 | } |
1896 | ||
9c7eddf1 | 1897 | pr_info("module loaded\n"); |
f2298c04 | 1898 | return 0; |
af096e22 MH |
1899 | |
1900 | err_dev: | |
1901 | while (!list_empty(&nullb_list)) { | |
1902 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 1903 | dev = nullb->dev; |
af096e22 | 1904 | null_del_dev(nullb); |
2984c868 | 1905 | null_free_dev(dev); |
af096e22 | 1906 | } |
af096e22 | 1907 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
1908 | err_conf: |
1909 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 1910 | err_tagset: |
2984c868 | 1911 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 1912 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 1913 | return ret; |
f2298c04 JA |
1914 | } |
1915 | ||
1916 | static void __exit null_exit(void) | |
1917 | { | |
1918 | struct nullb *nullb; | |
1919 | ||
3bf2bd20 SL |
1920 | configfs_unregister_subsystem(&nullb_subsys); |
1921 | ||
f2298c04 JA |
1922 | unregister_blkdev(null_major, "nullb"); |
1923 | ||
1924 | mutex_lock(&lock); | |
1925 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
1926 | struct nullb_device *dev; |
1927 | ||
f2298c04 | 1928 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 1929 | dev = nullb->dev; |
f2298c04 | 1930 | null_del_dev(nullb); |
2984c868 | 1931 | null_free_dev(dev); |
f2298c04 JA |
1932 | } |
1933 | mutex_unlock(&lock); | |
6bb9535b | 1934 | |
2984c868 | 1935 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe | 1936 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
1937 | } |
1938 | ||
1939 | module_init(null_init); | |
1940 | module_exit(null_exit); | |
1941 | ||
231b3db1 | 1942 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 1943 | MODULE_LICENSE("GPL"); |