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 | ||
82f402fe | 144 | static int nr_devices = 1; |
5657a819 | 145 | module_param(nr_devices, int, 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); | |
230 | if (result) | |
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); | |
244 | if (result) | |
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); | |
258 | if (result) | |
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}. */ | |
266 | #define NULLB_DEVICE_ATTR(NAME, TYPE) \ | |
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 | if (test_bit(NULLB_DEV_FL_CONFIGURED, &to_nullb_device(item)->flags)) \ | |
278 | return -EBUSY; \ | |
279 | return nullb_device_##TYPE##_attr_store( \ | |
280 | &to_nullb_device(item)->NAME, page, count); \ | |
281 | } \ | |
282 | CONFIGFS_ATTR(nullb_device_, NAME); | |
283 | ||
284 | NULLB_DEVICE_ATTR(size, ulong); | |
285 | NULLB_DEVICE_ATTR(completion_nsec, ulong); | |
286 | NULLB_DEVICE_ATTR(submit_queues, uint); | |
287 | NULLB_DEVICE_ATTR(home_node, uint); | |
288 | NULLB_DEVICE_ATTR(queue_mode, uint); | |
289 | NULLB_DEVICE_ATTR(blocksize, uint); | |
290 | NULLB_DEVICE_ATTR(irqmode, uint); | |
291 | NULLB_DEVICE_ATTR(hw_queue_depth, uint); | |
cedcafad | 292 | NULLB_DEVICE_ATTR(index, uint); |
3bf2bd20 SL |
293 | NULLB_DEVICE_ATTR(blocking, bool); |
294 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool); | |
5bcd0e0c | 295 | NULLB_DEVICE_ATTR(memory_backed, bool); |
306eb6b4 | 296 | NULLB_DEVICE_ATTR(discard, bool); |
eff2c4f1 | 297 | NULLB_DEVICE_ATTR(mbps, uint); |
deb78b41 | 298 | NULLB_DEVICE_ATTR(cache_size, ulong); |
ca4b2a01 MB |
299 | NULLB_DEVICE_ATTR(zoned, bool); |
300 | NULLB_DEVICE_ATTR(zone_size, ulong); | |
ea2c18e1 | 301 | NULLB_DEVICE_ATTR(zone_nr_conv, uint); |
3bf2bd20 | 302 | |
cedcafad SL |
303 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
304 | { | |
305 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
306 | } | |
307 | ||
308 | static ssize_t nullb_device_power_store(struct config_item *item, | |
309 | const char *page, size_t count) | |
310 | { | |
311 | struct nullb_device *dev = to_nullb_device(item); | |
312 | bool newp = false; | |
313 | ssize_t ret; | |
314 | ||
315 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
316 | if (ret < 0) | |
317 | return ret; | |
318 | ||
319 | if (!dev->power && newp) { | |
320 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
321 | return count; | |
322 | if (null_add_dev(dev)) { | |
323 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
324 | return -ENOMEM; | |
325 | } | |
326 | ||
327 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
328 | dev->power = newp; | |
b3c30512 | 329 | } else if (dev->power && !newp) { |
7602843f BL |
330 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
331 | mutex_lock(&lock); | |
332 | dev->power = newp; | |
333 | null_del_dev(dev->nullb); | |
334 | mutex_unlock(&lock); | |
335 | } | |
00a8cdb8 | 336 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
337 | } |
338 | ||
339 | return count; | |
340 | } | |
341 | ||
342 | CONFIGFS_ATTR(nullb_device_, power); | |
343 | ||
2f54a613 SL |
344 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
345 | { | |
346 | struct nullb_device *t_dev = to_nullb_device(item); | |
347 | ||
348 | return badblocks_show(&t_dev->badblocks, page, 0); | |
349 | } | |
350 | ||
351 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
352 | const char *page, size_t count) | |
353 | { | |
354 | struct nullb_device *t_dev = to_nullb_device(item); | |
355 | char *orig, *buf, *tmp; | |
356 | u64 start, end; | |
357 | int ret; | |
358 | ||
359 | orig = kstrndup(page, count, GFP_KERNEL); | |
360 | if (!orig) | |
361 | return -ENOMEM; | |
362 | ||
363 | buf = strstrip(orig); | |
364 | ||
365 | ret = -EINVAL; | |
366 | if (buf[0] != '+' && buf[0] != '-') | |
367 | goto out; | |
368 | tmp = strchr(&buf[1], '-'); | |
369 | if (!tmp) | |
370 | goto out; | |
371 | *tmp = '\0'; | |
372 | ret = kstrtoull(buf + 1, 0, &start); | |
373 | if (ret) | |
374 | goto out; | |
375 | ret = kstrtoull(tmp + 1, 0, &end); | |
376 | if (ret) | |
377 | goto out; | |
378 | ret = -EINVAL; | |
379 | if (start > end) | |
380 | goto out; | |
381 | /* enable badblocks */ | |
382 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
383 | if (buf[0] == '+') | |
384 | ret = badblocks_set(&t_dev->badblocks, start, | |
385 | end - start + 1, 1); | |
386 | else | |
387 | ret = badblocks_clear(&t_dev->badblocks, start, | |
388 | end - start + 1); | |
389 | if (ret == 0) | |
390 | ret = count; | |
391 | out: | |
392 | kfree(orig); | |
393 | return ret; | |
394 | } | |
395 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
396 | ||
3bf2bd20 SL |
397 | static struct configfs_attribute *nullb_device_attrs[] = { |
398 | &nullb_device_attr_size, | |
399 | &nullb_device_attr_completion_nsec, | |
400 | &nullb_device_attr_submit_queues, | |
401 | &nullb_device_attr_home_node, | |
402 | &nullb_device_attr_queue_mode, | |
403 | &nullb_device_attr_blocksize, | |
404 | &nullb_device_attr_irqmode, | |
405 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 406 | &nullb_device_attr_index, |
3bf2bd20 SL |
407 | &nullb_device_attr_blocking, |
408 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 409 | &nullb_device_attr_power, |
5bcd0e0c | 410 | &nullb_device_attr_memory_backed, |
306eb6b4 | 411 | &nullb_device_attr_discard, |
eff2c4f1 | 412 | &nullb_device_attr_mbps, |
deb78b41 | 413 | &nullb_device_attr_cache_size, |
2f54a613 | 414 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
415 | &nullb_device_attr_zoned, |
416 | &nullb_device_attr_zone_size, | |
ea2c18e1 | 417 | &nullb_device_attr_zone_nr_conv, |
3bf2bd20 SL |
418 | NULL, |
419 | }; | |
420 | ||
421 | static void nullb_device_release(struct config_item *item) | |
422 | { | |
5bcd0e0c SL |
423 | struct nullb_device *dev = to_nullb_device(item); |
424 | ||
deb78b41 | 425 | null_free_device_storage(dev, false); |
5bcd0e0c | 426 | null_free_dev(dev); |
3bf2bd20 SL |
427 | } |
428 | ||
429 | static struct configfs_item_operations nullb_device_ops = { | |
430 | .release = nullb_device_release, | |
431 | }; | |
432 | ||
e1919dff | 433 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
434 | .ct_item_ops = &nullb_device_ops, |
435 | .ct_attrs = nullb_device_attrs, | |
436 | .ct_owner = THIS_MODULE, | |
437 | }; | |
438 | ||
439 | static struct | |
440 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
441 | { | |
442 | struct nullb_device *dev; | |
443 | ||
444 | dev = null_alloc_dev(); | |
445 | if (!dev) | |
446 | return ERR_PTR(-ENOMEM); | |
447 | ||
448 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
449 | ||
450 | return &dev->item; | |
451 | } | |
452 | ||
453 | static void | |
454 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
455 | { | |
cedcafad SL |
456 | struct nullb_device *dev = to_nullb_device(item); |
457 | ||
458 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
459 | mutex_lock(&lock); | |
460 | dev->power = false; | |
461 | null_del_dev(dev->nullb); | |
462 | mutex_unlock(&lock); | |
463 | } | |
464 | ||
3bf2bd20 SL |
465 | config_item_put(item); |
466 | } | |
467 | ||
468 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
469 | { | |
ca4b2a01 | 470 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size\n"); |
3bf2bd20 SL |
471 | } |
472 | ||
473 | CONFIGFS_ATTR_RO(memb_group_, features); | |
474 | ||
475 | static struct configfs_attribute *nullb_group_attrs[] = { | |
476 | &memb_group_attr_features, | |
477 | NULL, | |
478 | }; | |
479 | ||
480 | static struct configfs_group_operations nullb_group_ops = { | |
481 | .make_item = nullb_group_make_item, | |
482 | .drop_item = nullb_group_drop_item, | |
483 | }; | |
484 | ||
e1919dff | 485 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
486 | .ct_group_ops = &nullb_group_ops, |
487 | .ct_attrs = nullb_group_attrs, | |
488 | .ct_owner = THIS_MODULE, | |
489 | }; | |
490 | ||
491 | static struct configfs_subsystem nullb_subsys = { | |
492 | .su_group = { | |
493 | .cg_item = { | |
494 | .ci_namebuf = "nullb", | |
495 | .ci_type = &nullb_group_type, | |
496 | }, | |
497 | }, | |
498 | }; | |
499 | ||
deb78b41 SL |
500 | static inline int null_cache_active(struct nullb *nullb) |
501 | { | |
502 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
503 | } | |
504 | ||
2984c868 SL |
505 | static struct nullb_device *null_alloc_dev(void) |
506 | { | |
507 | struct nullb_device *dev; | |
508 | ||
509 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
510 | if (!dev) | |
511 | return NULL; | |
5bcd0e0c | 512 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 513 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
514 | if (badblocks_init(&dev->badblocks, 0)) { |
515 | kfree(dev); | |
516 | return NULL; | |
517 | } | |
518 | ||
2984c868 SL |
519 | dev->size = g_gb * 1024; |
520 | dev->completion_nsec = g_completion_nsec; | |
521 | dev->submit_queues = g_submit_queues; | |
522 | dev->home_node = g_home_node; | |
523 | dev->queue_mode = g_queue_mode; | |
524 | dev->blocksize = g_bs; | |
525 | dev->irqmode = g_irqmode; | |
526 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 SL |
527 | dev->blocking = g_blocking; |
528 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
ca4b2a01 MB |
529 | dev->zoned = g_zoned; |
530 | dev->zone_size = g_zone_size; | |
ea2c18e1 | 531 | dev->zone_nr_conv = g_zone_nr_conv; |
2984c868 SL |
532 | return dev; |
533 | } | |
534 | ||
535 | static void null_free_dev(struct nullb_device *dev) | |
536 | { | |
1addb798 DD |
537 | if (!dev) |
538 | return; | |
539 | ||
ca4b2a01 | 540 | null_zone_exit(dev); |
1addb798 | 541 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
542 | kfree(dev); |
543 | } | |
544 | ||
f2298c04 JA |
545 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
546 | { | |
547 | clear_bit_unlock(tag, nq->tag_map); | |
548 | ||
549 | if (waitqueue_active(&nq->wait)) | |
550 | wake_up(&nq->wait); | |
551 | } | |
552 | ||
553 | static unsigned int get_tag(struct nullb_queue *nq) | |
554 | { | |
555 | unsigned int tag; | |
556 | ||
557 | do { | |
558 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
559 | if (tag >= nq->queue_depth) | |
560 | return -1U; | |
561 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
562 | ||
563 | return tag; | |
564 | } | |
565 | ||
566 | static void free_cmd(struct nullb_cmd *cmd) | |
567 | { | |
568 | put_tag(cmd->nq, cmd->tag); | |
569 | } | |
570 | ||
3c395a96 PV |
571 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
572 | ||
f2298c04 JA |
573 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
574 | { | |
575 | struct nullb_cmd *cmd; | |
576 | unsigned int tag; | |
577 | ||
578 | tag = get_tag(nq); | |
579 | if (tag != -1U) { | |
580 | cmd = &nq->cmds[tag]; | |
581 | cmd->tag = tag; | |
582 | cmd->nq = nq; | |
2984c868 | 583 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
584 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
585 | HRTIMER_MODE_REL); | |
586 | cmd->timer.function = null_cmd_timer_expired; | |
587 | } | |
f2298c04 JA |
588 | return cmd; |
589 | } | |
590 | ||
591 | return NULL; | |
592 | } | |
593 | ||
594 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
595 | { | |
596 | struct nullb_cmd *cmd; | |
597 | DEFINE_WAIT(wait); | |
598 | ||
599 | cmd = __alloc_cmd(nq); | |
600 | if (cmd || !can_wait) | |
601 | return cmd; | |
602 | ||
603 | do { | |
604 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
605 | cmd = __alloc_cmd(nq); | |
606 | if (cmd) | |
607 | break; | |
608 | ||
609 | io_schedule(); | |
610 | } while (1); | |
611 | ||
612 | finish_wait(&nq->wait, &wait); | |
613 | return cmd; | |
614 | } | |
615 | ||
616 | static void end_cmd(struct nullb_cmd *cmd) | |
617 | { | |
2984c868 | 618 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 619 | |
ce2c350b CH |
620 | switch (queue_mode) { |
621 | case NULL_Q_MQ: | |
5bcd0e0c | 622 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b | 623 | return; |
ce2c350b | 624 | case NULL_Q_BIO: |
5bcd0e0c | 625 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 626 | bio_endio(cmd->bio); |
48cc661e | 627 | break; |
ce2c350b | 628 | } |
f2298c04 | 629 | |
48cc661e | 630 | free_cmd(cmd); |
cf8ecc5a AA |
631 | } |
632 | ||
633 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
634 | { | |
635 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
636 | |
637 | return HRTIMER_NORESTART; | |
638 | } | |
639 | ||
640 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
641 | { | |
2984c868 | 642 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 643 | |
3c395a96 | 644 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
645 | } |
646 | ||
49f66136 | 647 | static void null_complete_rq(struct request *rq) |
f2298c04 | 648 | { |
49f66136 | 649 | end_cmd(blk_mq_rq_to_pdu(rq)); |
f2298c04 JA |
650 | } |
651 | ||
5bcd0e0c SL |
652 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
653 | { | |
654 | struct nullb_page *t_page; | |
655 | ||
656 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
657 | if (!t_page) | |
658 | goto out; | |
659 | ||
660 | t_page->page = alloc_pages(gfp_flags, 0); | |
661 | if (!t_page->page) | |
662 | goto out_freepage; | |
663 | ||
66231ad3 | 664 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
665 | return t_page; |
666 | out_freepage: | |
667 | kfree(t_page); | |
668 | out: | |
669 | return NULL; | |
670 | } | |
671 | ||
672 | static void null_free_page(struct nullb_page *t_page) | |
673 | { | |
66231ad3 ML |
674 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
675 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 676 | return; |
5bcd0e0c SL |
677 | __free_page(t_page->page); |
678 | kfree(t_page); | |
679 | } | |
680 | ||
66231ad3 ML |
681 | static bool null_page_empty(struct nullb_page *page) |
682 | { | |
683 | int size = MAP_SZ - 2; | |
684 | ||
685 | return find_first_bit(page->bitmap, size) == size; | |
686 | } | |
687 | ||
deb78b41 SL |
688 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
689 | bool is_cache) | |
5bcd0e0c SL |
690 | { |
691 | unsigned int sector_bit; | |
692 | u64 idx; | |
693 | struct nullb_page *t_page, *ret; | |
694 | struct radix_tree_root *root; | |
695 | ||
deb78b41 | 696 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
697 | idx = sector >> PAGE_SECTORS_SHIFT; |
698 | sector_bit = (sector & SECTOR_MASK); | |
699 | ||
700 | t_page = radix_tree_lookup(root, idx); | |
701 | if (t_page) { | |
66231ad3 | 702 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 703 | |
66231ad3 | 704 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
705 | ret = radix_tree_delete_item(root, idx, t_page); |
706 | WARN_ON(ret != t_page); | |
707 | null_free_page(ret); | |
deb78b41 SL |
708 | if (is_cache) |
709 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
710 | } |
711 | } | |
712 | } | |
713 | ||
714 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 715 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
716 | { |
717 | struct radix_tree_root *root; | |
718 | ||
deb78b41 | 719 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
720 | |
721 | if (radix_tree_insert(root, idx, t_page)) { | |
722 | null_free_page(t_page); | |
723 | t_page = radix_tree_lookup(root, idx); | |
724 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
725 | } else if (is_cache) |
726 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
727 | |
728 | return t_page; | |
729 | } | |
730 | ||
deb78b41 | 731 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
732 | { |
733 | unsigned long pos = 0; | |
734 | int nr_pages; | |
735 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
736 | struct radix_tree_root *root; | |
737 | ||
deb78b41 | 738 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
739 | |
740 | do { | |
741 | int i; | |
742 | ||
743 | nr_pages = radix_tree_gang_lookup(root, | |
744 | (void **)t_pages, pos, FREE_BATCH); | |
745 | ||
746 | for (i = 0; i < nr_pages; i++) { | |
747 | pos = t_pages[i]->page->index; | |
748 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
749 | WARN_ON(ret != t_pages[i]); | |
750 | null_free_page(ret); | |
751 | } | |
752 | ||
753 | pos++; | |
754 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
755 | |
756 | if (is_cache) | |
757 | dev->curr_cache = 0; | |
5bcd0e0c SL |
758 | } |
759 | ||
deb78b41 SL |
760 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
761 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
762 | { |
763 | unsigned int sector_bit; | |
764 | u64 idx; | |
765 | struct nullb_page *t_page; | |
deb78b41 | 766 | struct radix_tree_root *root; |
5bcd0e0c SL |
767 | |
768 | idx = sector >> PAGE_SECTORS_SHIFT; | |
769 | sector_bit = (sector & SECTOR_MASK); | |
770 | ||
deb78b41 SL |
771 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
772 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
773 | WARN_ON(t_page && t_page->page->index != idx); |
774 | ||
66231ad3 | 775 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
776 | return t_page; |
777 | ||
778 | return NULL; | |
779 | } | |
780 | ||
deb78b41 SL |
781 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
782 | sector_t sector, bool for_write, bool ignore_cache) | |
783 | { | |
784 | struct nullb_page *page = NULL; | |
785 | ||
786 | if (!ignore_cache) | |
787 | page = __null_lookup_page(nullb, sector, for_write, true); | |
788 | if (page) | |
789 | return page; | |
790 | return __null_lookup_page(nullb, sector, for_write, false); | |
791 | } | |
792 | ||
5bcd0e0c | 793 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
794 | sector_t sector, bool ignore_cache) |
795 | __releases(&nullb->lock) | |
796 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
797 | { |
798 | u64 idx; | |
799 | struct nullb_page *t_page; | |
800 | ||
deb78b41 | 801 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
802 | if (t_page) |
803 | return t_page; | |
804 | ||
805 | spin_unlock_irq(&nullb->lock); | |
806 | ||
807 | t_page = null_alloc_page(GFP_NOIO); | |
808 | if (!t_page) | |
809 | goto out_lock; | |
810 | ||
811 | if (radix_tree_preload(GFP_NOIO)) | |
812 | goto out_freepage; | |
813 | ||
814 | spin_lock_irq(&nullb->lock); | |
815 | idx = sector >> PAGE_SECTORS_SHIFT; | |
816 | t_page->page->index = idx; | |
deb78b41 | 817 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
818 | radix_tree_preload_end(); |
819 | ||
820 | return t_page; | |
821 | out_freepage: | |
822 | null_free_page(t_page); | |
823 | out_lock: | |
824 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
825 | return null_lookup_page(nullb, sector, true, ignore_cache); |
826 | } | |
827 | ||
828 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
829 | { | |
830 | int i; | |
831 | unsigned int offset; | |
832 | u64 idx; | |
833 | struct nullb_page *t_page, *ret; | |
834 | void *dst, *src; | |
835 | ||
836 | idx = c_page->page->index; | |
837 | ||
838 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
839 | ||
66231ad3 ML |
840 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
841 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 842 | null_free_page(c_page); |
66231ad3 | 843 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
844 | ret = radix_tree_delete_item(&nullb->dev->data, |
845 | idx, t_page); | |
846 | null_free_page(t_page); | |
847 | } | |
848 | return 0; | |
849 | } | |
850 | ||
851 | if (!t_page) | |
852 | return -ENOMEM; | |
853 | ||
854 | src = kmap_atomic(c_page->page); | |
855 | dst = kmap_atomic(t_page->page); | |
856 | ||
857 | for (i = 0; i < PAGE_SECTORS; | |
858 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 859 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
860 | offset = (i << SECTOR_SHIFT); |
861 | memcpy(dst + offset, src + offset, | |
862 | nullb->dev->blocksize); | |
66231ad3 | 863 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
864 | } |
865 | } | |
866 | ||
867 | kunmap_atomic(dst); | |
868 | kunmap_atomic(src); | |
869 | ||
870 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
871 | null_free_page(ret); | |
872 | nullb->dev->curr_cache -= PAGE_SIZE; | |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
877 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 878 | { |
deb78b41 SL |
879 | int i, err, nr_pages; |
880 | struct nullb_page *c_pages[FREE_BATCH]; | |
881 | unsigned long flushed = 0, one_round; | |
882 | ||
883 | again: | |
884 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
885 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
886 | return 0; | |
887 | ||
888 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
889 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
890 | /* | |
891 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
892 | * avoid race, we don't allow page free | |
893 | */ | |
894 | for (i = 0; i < nr_pages; i++) { | |
895 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
896 | /* | |
897 | * We found the page which is being flushed to disk by other | |
898 | * threads | |
899 | */ | |
66231ad3 | 900 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
901 | c_pages[i] = NULL; |
902 | else | |
66231ad3 | 903 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
904 | } |
905 | ||
906 | one_round = 0; | |
907 | for (i = 0; i < nr_pages; i++) { | |
908 | if (c_pages[i] == NULL) | |
909 | continue; | |
910 | err = null_flush_cache_page(nullb, c_pages[i]); | |
911 | if (err) | |
912 | return err; | |
913 | one_round++; | |
914 | } | |
915 | flushed += one_round << PAGE_SHIFT; | |
916 | ||
917 | if (n > flushed) { | |
918 | if (nr_pages == 0) | |
919 | nullb->cache_flush_pos = 0; | |
920 | if (one_round == 0) { | |
921 | /* give other threads a chance */ | |
922 | spin_unlock_irq(&nullb->lock); | |
923 | spin_lock_irq(&nullb->lock); | |
924 | } | |
925 | goto again; | |
926 | } | |
927 | return 0; | |
5bcd0e0c SL |
928 | } |
929 | ||
930 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 931 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
932 | { |
933 | size_t temp, count = 0; | |
934 | unsigned int offset; | |
935 | struct nullb_page *t_page; | |
936 | void *dst, *src; | |
937 | ||
938 | while (count < n) { | |
939 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
940 | ||
deb78b41 SL |
941 | if (null_cache_active(nullb) && !is_fua) |
942 | null_make_cache_space(nullb, PAGE_SIZE); | |
943 | ||
5bcd0e0c | 944 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
945 | t_page = null_insert_page(nullb, sector, |
946 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
947 | if (!t_page) |
948 | return -ENOSPC; | |
949 | ||
950 | src = kmap_atomic(source); | |
951 | dst = kmap_atomic(t_page->page); | |
952 | memcpy(dst + offset, src + off + count, temp); | |
953 | kunmap_atomic(dst); | |
954 | kunmap_atomic(src); | |
955 | ||
66231ad3 | 956 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 957 | |
deb78b41 SL |
958 | if (is_fua) |
959 | null_free_sector(nullb, sector, true); | |
960 | ||
5bcd0e0c SL |
961 | count += temp; |
962 | sector += temp >> SECTOR_SHIFT; | |
963 | } | |
964 | return 0; | |
965 | } | |
966 | ||
967 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
968 | unsigned int off, sector_t sector, size_t n) | |
969 | { | |
970 | size_t temp, count = 0; | |
971 | unsigned int offset; | |
972 | struct nullb_page *t_page; | |
973 | void *dst, *src; | |
974 | ||
975 | while (count < n) { | |
976 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
977 | ||
978 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
979 | t_page = null_lookup_page(nullb, sector, false, |
980 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
981 | |
982 | dst = kmap_atomic(dest); | |
983 | if (!t_page) { | |
984 | memset(dst + off + count, 0, temp); | |
985 | goto next; | |
986 | } | |
987 | src = kmap_atomic(t_page->page); | |
988 | memcpy(dst + off + count, src + offset, temp); | |
989 | kunmap_atomic(src); | |
990 | next: | |
991 | kunmap_atomic(dst); | |
992 | ||
993 | count += temp; | |
994 | sector += temp >> SECTOR_SHIFT; | |
995 | } | |
996 | return 0; | |
997 | } | |
998 | ||
306eb6b4 SL |
999 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
1000 | { | |
1001 | size_t temp; | |
1002 | ||
1003 | spin_lock_irq(&nullb->lock); | |
1004 | while (n > 0) { | |
1005 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1006 | null_free_sector(nullb, sector, false); |
1007 | if (null_cache_active(nullb)) | |
1008 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1009 | sector += temp >> SECTOR_SHIFT; |
1010 | n -= temp; | |
1011 | } | |
1012 | spin_unlock_irq(&nullb->lock); | |
1013 | } | |
1014 | ||
deb78b41 SL |
1015 | static int null_handle_flush(struct nullb *nullb) |
1016 | { | |
1017 | int err; | |
1018 | ||
1019 | if (!null_cache_active(nullb)) | |
1020 | return 0; | |
1021 | ||
1022 | spin_lock_irq(&nullb->lock); | |
1023 | while (true) { | |
1024 | err = null_make_cache_space(nullb, | |
1025 | nullb->dev->cache_size * 1024 * 1024); | |
1026 | if (err || nullb->dev->curr_cache == 0) | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1031 | spin_unlock_irq(&nullb->lock); | |
1032 | return err; | |
1033 | } | |
1034 | ||
5bcd0e0c | 1035 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1036 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1037 | bool is_fua) | |
f2298c04 | 1038 | { |
5bcd0e0c SL |
1039 | int err = 0; |
1040 | ||
1041 | if (!is_write) { | |
1042 | err = copy_from_nullb(nullb, page, off, sector, len); | |
1043 | flush_dcache_page(page); | |
1044 | } else { | |
1045 | flush_dcache_page(page); | |
deb78b41 | 1046 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1047 | } |
1048 | ||
1049 | return err; | |
1050 | } | |
1051 | ||
1052 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1053 | { | |
1054 | struct request *rq = cmd->rq; | |
1055 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1056 | int err; | |
1057 | unsigned int len; | |
1058 | sector_t sector; | |
1059 | struct req_iterator iter; | |
1060 | struct bio_vec bvec; | |
1061 | ||
1062 | sector = blk_rq_pos(rq); | |
1063 | ||
306eb6b4 SL |
1064 | if (req_op(rq) == REQ_OP_DISCARD) { |
1065 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1066 | return 0; | |
1067 | } | |
1068 | ||
5bcd0e0c SL |
1069 | spin_lock_irq(&nullb->lock); |
1070 | rq_for_each_segment(bvec, rq, iter) { | |
1071 | len = bvec.bv_len; | |
1072 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1073 | op_is_write(req_op(rq)), sector, |
1074 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1075 | if (err) { |
1076 | spin_unlock_irq(&nullb->lock); | |
1077 | return err; | |
1078 | } | |
1079 | sector += len >> SECTOR_SHIFT; | |
1080 | } | |
1081 | spin_unlock_irq(&nullb->lock); | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1087 | { | |
1088 | struct bio *bio = cmd->bio; | |
1089 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1090 | int err; | |
1091 | unsigned int len; | |
1092 | sector_t sector; | |
1093 | struct bio_vec bvec; | |
1094 | struct bvec_iter iter; | |
1095 | ||
1096 | sector = bio->bi_iter.bi_sector; | |
1097 | ||
306eb6b4 SL |
1098 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1099 | null_handle_discard(nullb, sector, | |
1100 | bio_sectors(bio) << SECTOR_SHIFT); | |
1101 | return 0; | |
1102 | } | |
1103 | ||
5bcd0e0c SL |
1104 | spin_lock_irq(&nullb->lock); |
1105 | bio_for_each_segment(bvec, bio, iter) { | |
1106 | len = bvec.bv_len; | |
1107 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1108 | op_is_write(bio_op(bio)), sector, |
bf7c7a04 | 1109 | bio->bi_opf & REQ_FUA); |
5bcd0e0c SL |
1110 | if (err) { |
1111 | spin_unlock_irq(&nullb->lock); | |
1112 | return err; | |
1113 | } | |
1114 | sector += len >> SECTOR_SHIFT; | |
1115 | } | |
1116 | spin_unlock_irq(&nullb->lock); | |
1117 | return 0; | |
1118 | } | |
1119 | ||
eff2c4f1 SL |
1120 | static void null_stop_queue(struct nullb *nullb) |
1121 | { | |
1122 | struct request_queue *q = nullb->q; | |
1123 | ||
1124 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1125 | blk_mq_stop_hw_queues(q); | |
eff2c4f1 SL |
1126 | } |
1127 | ||
1128 | static void null_restart_queue_async(struct nullb *nullb) | |
1129 | { | |
1130 | struct request_queue *q = nullb->q; | |
eff2c4f1 SL |
1131 | |
1132 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1133 | blk_mq_start_stopped_hw_queues(q, true); | |
eff2c4f1 SL |
1134 | } |
1135 | ||
adb84284 CK |
1136 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
1137 | { | |
1138 | struct nullb_device *dev = cmd->nq->dev; | |
1139 | struct nullb *nullb = dev->nullb; | |
1140 | blk_status_t sts = BLK_STS_OK; | |
1141 | struct request *rq = cmd->rq; | |
1142 | ||
1143 | if (!hrtimer_active(&nullb->bw_timer)) | |
1144 | hrtimer_restart(&nullb->bw_timer); | |
1145 | ||
1146 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { | |
1147 | null_stop_queue(nullb); | |
1148 | /* race with timer */ | |
1149 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1150 | null_restart_queue_async(nullb); | |
1151 | /* requeue request */ | |
1152 | sts = BLK_STS_DEV_RESOURCE; | |
1153 | } | |
1154 | return sts; | |
1155 | } | |
1156 | ||
8f94d1c1 CK |
1157 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
1158 | sector_t sector, | |
1159 | sector_t nr_sectors) | |
1160 | { | |
1161 | struct badblocks *bb = &cmd->nq->dev->badblocks; | |
1162 | sector_t first_bad; | |
1163 | int bad_sectors; | |
1164 | ||
1165 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) | |
1166 | return BLK_STS_IOERR; | |
1167 | ||
1168 | return BLK_STS_OK; | |
1169 | } | |
1170 | ||
7ea88e22 CK |
1171 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
1172 | enum req_opf op) | |
1173 | { | |
1174 | struct nullb_device *dev = cmd->nq->dev; | |
1175 | int err; | |
1176 | ||
1177 | if (dev->queue_mode == NULL_Q_BIO) | |
1178 | err = null_handle_bio(cmd); | |
1179 | else | |
1180 | err = null_handle_rq(cmd); | |
1181 | ||
1182 | return errno_to_blk_status(err); | |
1183 | } | |
1184 | ||
a3d7d674 CK |
1185 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
1186 | { | |
1187 | /* Complete IO by inline, softirq or timer */ | |
1188 | switch (cmd->nq->dev->irqmode) { | |
1189 | case NULL_IRQ_SOFTIRQ: | |
1190 | switch (cmd->nq->dev->queue_mode) { | |
1191 | case NULL_Q_MQ: | |
1192 | blk_mq_complete_request(cmd->rq); | |
1193 | break; | |
1194 | case NULL_Q_BIO: | |
1195 | /* | |
1196 | * XXX: no proper submitting cpu information available. | |
1197 | */ | |
1198 | end_cmd(cmd); | |
1199 | break; | |
1200 | } | |
1201 | break; | |
1202 | case NULL_IRQ_NONE: | |
1203 | end_cmd(cmd); | |
1204 | break; | |
1205 | case NULL_IRQ_TIMER: | |
1206 | null_cmd_end_timer(cmd); | |
1207 | break; | |
1208 | } | |
1209 | } | |
1210 | ||
d4b186ed CK |
1211 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
1212 | sector_t nr_sectors, enum req_opf op) | |
5bcd0e0c SL |
1213 | { |
1214 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1215 | struct nullb *nullb = dev->nullb; |
adb84284 | 1216 | blk_status_t sts; |
5bcd0e0c | 1217 | |
eff2c4f1 | 1218 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
adb84284 CK |
1219 | sts = null_handle_throttled(cmd); |
1220 | if (sts != BLK_STS_OK) | |
1221 | return sts; | |
eff2c4f1 SL |
1222 | } |
1223 | ||
d4b186ed CK |
1224 | if (op == REQ_OP_FLUSH) { |
1225 | cmd->error = errno_to_blk_status(null_handle_flush(nullb)); | |
1226 | goto out; | |
1227 | } | |
d4b186ed | 1228 | |
8f94d1c1 CK |
1229 | if (nullb->dev->badblocks.shift != -1) { |
1230 | cmd->error = null_handle_badblocks(cmd, sector, nr_sectors); | |
1231 | if (cmd->error != BLK_STS_OK) | |
2f54a613 | 1232 | goto out; |
2f54a613 SL |
1233 | } |
1234 | ||
7ea88e22 CK |
1235 | if (dev->memory_backed) |
1236 | cmd->error = null_handle_memory_backed(cmd, op); | |
ca4b2a01 | 1237 | |
fceb5d1b CK |
1238 | if (!cmd->error && dev->zoned) |
1239 | cmd->error = null_handle_zoned(cmd, op, sector, nr_sectors); | |
1240 | ||
2f54a613 | 1241 | out: |
a3d7d674 | 1242 | nullb_complete_cmd(cmd); |
5bcd0e0c | 1243 | return BLK_STS_OK; |
f2298c04 JA |
1244 | } |
1245 | ||
eff2c4f1 SL |
1246 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1247 | { | |
1248 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1249 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1250 | unsigned int mbps = nullb->dev->mbps; | |
1251 | ||
1252 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1253 | return HRTIMER_NORESTART; | |
1254 | ||
1255 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1256 | null_restart_queue_async(nullb); | |
1257 | ||
1258 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1259 | ||
1260 | return HRTIMER_RESTART; | |
1261 | } | |
1262 | ||
1263 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1264 | { | |
1265 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1266 | ||
1267 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1268 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1269 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1270 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1271 | } |
1272 | ||
1273 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1274 | { | |
1275 | int index = 0; | |
1276 | ||
1277 | if (nullb->nr_queues != 1) | |
1278 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1279 | ||
1280 | return &nullb->queues[index]; | |
1281 | } | |
1282 | ||
dece1635 | 1283 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 | 1284 | { |
d4b186ed CK |
1285 | sector_t sector = bio->bi_iter.bi_sector; |
1286 | sector_t nr_sectors = bio_sectors(bio); | |
f2298c04 JA |
1287 | struct nullb *nullb = q->queuedata; |
1288 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1289 | struct nullb_cmd *cmd; | |
1290 | ||
1291 | cmd = alloc_cmd(nq, 1); | |
1292 | cmd->bio = bio; | |
1293 | ||
d4b186ed | 1294 | null_handle_cmd(cmd, sector, nr_sectors, bio_op(bio)); |
dece1635 | 1295 | return BLK_QC_T_NONE; |
f2298c04 JA |
1296 | } |
1297 | ||
93b57046 JA |
1298 | static bool should_timeout_request(struct request *rq) |
1299 | { | |
33f782c4 | 1300 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 JA |
1301 | if (g_timeout_str[0]) |
1302 | return should_fail(&null_timeout_attr, 1); | |
33f782c4 | 1303 | #endif |
24941b90 JA |
1304 | return false; |
1305 | } | |
93b57046 | 1306 | |
24941b90 JA |
1307 | static bool should_requeue_request(struct request *rq) |
1308 | { | |
1309 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1310 | if (g_requeue_str[0]) | |
1311 | return should_fail(&null_requeue_attr, 1); | |
1312 | #endif | |
93b57046 JA |
1313 | return false; |
1314 | } | |
1315 | ||
5448aca4 JA |
1316 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res) |
1317 | { | |
4e47ee8f | 1318 | pr_info("null_blk: rq %p timed out\n", rq); |
0df0bb08 CH |
1319 | blk_mq_complete_request(rq); |
1320 | return BLK_EH_DONE; | |
5448aca4 JA |
1321 | } |
1322 | ||
fc17b653 | 1323 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1324 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1325 | { |
74c45052 | 1326 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1327 | struct nullb_queue *nq = hctx->driver_data; |
d4b186ed CK |
1328 | sector_t nr_sectors = blk_rq_sectors(bd->rq); |
1329 | sector_t sector = blk_rq_pos(bd->rq); | |
f2298c04 | 1330 | |
db5bcf87 JA |
1331 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1332 | ||
2984c868 | 1333 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1334 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1335 | cmd->timer.function = null_cmd_timer_expired; | |
1336 | } | |
74c45052 | 1337 | cmd->rq = bd->rq; |
2984c868 | 1338 | cmd->nq = nq; |
f2298c04 | 1339 | |
74c45052 | 1340 | blk_mq_start_request(bd->rq); |
e2490073 | 1341 | |
24941b90 JA |
1342 | if (should_requeue_request(bd->rq)) { |
1343 | /* | |
1344 | * Alternate between hitting the core BUSY path, and the | |
1345 | * driver driven requeue path | |
1346 | */ | |
1347 | nq->requeue_selection++; | |
1348 | if (nq->requeue_selection & 1) | |
1349 | return BLK_STS_RESOURCE; | |
1350 | else { | |
1351 | blk_mq_requeue_request(bd->rq, true); | |
1352 | return BLK_STS_OK; | |
1353 | } | |
1354 | } | |
1355 | if (should_timeout_request(bd->rq)) | |
1356 | return BLK_STS_OK; | |
93b57046 | 1357 | |
d4b186ed | 1358 | return null_handle_cmd(cmd, sector, nr_sectors, req_op(bd->rq)); |
f2298c04 JA |
1359 | } |
1360 | ||
f363b089 | 1361 | static const struct blk_mq_ops null_mq_ops = { |
f2298c04 | 1362 | .queue_rq = null_queue_rq, |
49f66136 | 1363 | .complete = null_complete_rq, |
5448aca4 | 1364 | .timeout = null_timeout_rq, |
f2298c04 JA |
1365 | }; |
1366 | ||
de65d2d2 MB |
1367 | static void cleanup_queue(struct nullb_queue *nq) |
1368 | { | |
1369 | kfree(nq->tag_map); | |
1370 | kfree(nq->cmds); | |
1371 | } | |
1372 | ||
1373 | static void cleanup_queues(struct nullb *nullb) | |
1374 | { | |
1375 | int i; | |
1376 | ||
1377 | for (i = 0; i < nullb->nr_queues; i++) | |
1378 | cleanup_queue(&nullb->queues[i]); | |
1379 | ||
1380 | kfree(nullb->queues); | |
1381 | } | |
1382 | ||
9ae2d0aa MB |
1383 | static void null_del_dev(struct nullb *nullb) |
1384 | { | |
2984c868 SL |
1385 | struct nullb_device *dev = nullb->dev; |
1386 | ||
94bc02e3 SL |
1387 | ida_simple_remove(&nullb_indexes, nullb->index); |
1388 | ||
9ae2d0aa MB |
1389 | list_del_init(&nullb->list); |
1390 | ||
74ede5af | 1391 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1392 | |
1393 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1394 | hrtimer_cancel(&nullb->bw_timer); | |
1395 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1396 | null_restart_queue_async(nullb); | |
1397 | } | |
1398 | ||
9ae2d0aa | 1399 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1400 | if (dev->queue_mode == NULL_Q_MQ && |
1401 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1402 | blk_mq_free_tag_set(nullb->tag_set); |
74ede5af | 1403 | put_disk(nullb->disk); |
9ae2d0aa | 1404 | cleanup_queues(nullb); |
deb78b41 SL |
1405 | if (null_cache_active(nullb)) |
1406 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1407 | kfree(nullb); |
2984c868 | 1408 | dev->nullb = NULL; |
9ae2d0aa MB |
1409 | } |
1410 | ||
306eb6b4 SL |
1411 | static void null_config_discard(struct nullb *nullb) |
1412 | { | |
1413 | if (nullb->dev->discard == false) | |
1414 | return; | |
1415 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1416 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1417 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
8b904b5b | 1418 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q); |
9ae2d0aa MB |
1419 | } |
1420 | ||
f2298c04 JA |
1421 | static int null_open(struct block_device *bdev, fmode_t mode) |
1422 | { | |
1423 | return 0; | |
1424 | } | |
1425 | ||
1426 | static void null_release(struct gendisk *disk, fmode_t mode) | |
1427 | { | |
1428 | } | |
1429 | ||
1430 | static const struct block_device_operations null_fops = { | |
1431 | .owner = THIS_MODULE, | |
1432 | .open = null_open, | |
1433 | .release = null_release, | |
e76239a3 | 1434 | .report_zones = null_zone_report, |
f2298c04 JA |
1435 | }; |
1436 | ||
82f402fe JA |
1437 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1438 | { | |
1439 | BUG_ON(!nullb); | |
1440 | BUG_ON(!nq); | |
1441 | ||
1442 | init_waitqueue_head(&nq->wait); | |
1443 | nq->queue_depth = nullb->queue_depth; | |
2984c868 | 1444 | nq->dev = nullb->dev; |
82f402fe JA |
1445 | } |
1446 | ||
1447 | static void null_init_queues(struct nullb *nullb) | |
1448 | { | |
1449 | struct request_queue *q = nullb->q; | |
1450 | struct blk_mq_hw_ctx *hctx; | |
1451 | struct nullb_queue *nq; | |
1452 | int i; | |
1453 | ||
1454 | queue_for_each_hw_ctx(q, hctx, i) { | |
1455 | if (!hctx->nr_ctx || !hctx->tags) | |
1456 | continue; | |
1457 | nq = &nullb->queues[i]; | |
1458 | hctx->driver_data = nq; | |
1459 | null_init_queue(nullb, nq); | |
1460 | nullb->nr_queues++; | |
1461 | } | |
1462 | } | |
1463 | ||
f2298c04 JA |
1464 | static int setup_commands(struct nullb_queue *nq) |
1465 | { | |
1466 | struct nullb_cmd *cmd; | |
1467 | int i, tag_size; | |
1468 | ||
6396bb22 | 1469 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
f2298c04 | 1470 | if (!nq->cmds) |
2d263a78 | 1471 | return -ENOMEM; |
f2298c04 JA |
1472 | |
1473 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
6396bb22 | 1474 | nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL); |
f2298c04 JA |
1475 | if (!nq->tag_map) { |
1476 | kfree(nq->cmds); | |
2d263a78 | 1477 | return -ENOMEM; |
f2298c04 JA |
1478 | } |
1479 | ||
1480 | for (i = 0; i < nq->queue_depth; i++) { | |
1481 | cmd = &nq->cmds[i]; | |
1482 | INIT_LIST_HEAD(&cmd->list); | |
1483 | cmd->ll_list.next = NULL; | |
1484 | cmd->tag = -1U; | |
1485 | } | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
f2298c04 JA |
1490 | static int setup_queues(struct nullb *nullb) |
1491 | { | |
6396bb22 KC |
1492 | nullb->queues = kcalloc(nullb->dev->submit_queues, |
1493 | sizeof(struct nullb_queue), | |
1494 | GFP_KERNEL); | |
f2298c04 | 1495 | if (!nullb->queues) |
2d263a78 | 1496 | return -ENOMEM; |
f2298c04 | 1497 | |
2984c868 | 1498 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1499 | |
2d263a78 MB |
1500 | return 0; |
1501 | } | |
1502 | ||
1503 | static int init_driver_queues(struct nullb *nullb) | |
1504 | { | |
1505 | struct nullb_queue *nq; | |
1506 | int i, ret = 0; | |
f2298c04 | 1507 | |
2984c868 | 1508 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1509 | nq = &nullb->queues[i]; |
2d263a78 MB |
1510 | |
1511 | null_init_queue(nullb, nq); | |
1512 | ||
1513 | ret = setup_commands(nq); | |
1514 | if (ret) | |
31f9690e | 1515 | return ret; |
f2298c04 JA |
1516 | nullb->nr_queues++; |
1517 | } | |
2d263a78 | 1518 | return 0; |
f2298c04 JA |
1519 | } |
1520 | ||
9ae2d0aa | 1521 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
1522 | { |
1523 | struct gendisk *disk; | |
f2298c04 | 1524 | sector_t size; |
9ae2d0aa | 1525 | |
2984c868 | 1526 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1527 | if (!disk) |
1528 | return -ENOMEM; | |
2984c868 | 1529 | size = (sector_t)nullb->dev->size * 1024 * 1024ULL; |
9ae2d0aa MB |
1530 | set_capacity(disk, size >> 9); |
1531 | ||
1532 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1533 | disk->major = null_major; | |
1534 | disk->first_minor = nullb->index; | |
1535 | disk->fops = &null_fops; | |
1536 | disk->private_data = nullb; | |
1537 | disk->queue = nullb->q; | |
1538 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1539 | ||
bf505456 DLM |
1540 | if (nullb->dev->zoned) { |
1541 | int ret = blk_revalidate_disk_zones(disk); | |
1542 | ||
1543 | if (ret != 0) | |
1544 | return ret; | |
1545 | } | |
1546 | ||
9ae2d0aa MB |
1547 | add_disk(disk); |
1548 | return 0; | |
1549 | } | |
1550 | ||
2984c868 | 1551 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1552 | { |
1553 | set->ops = &null_mq_ops; | |
2984c868 SL |
1554 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1555 | g_submit_queues; | |
1556 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1557 | g_hw_queue_depth; | |
1558 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1559 | set->cmd_size = sizeof(struct nullb_cmd); |
1560 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1561 | if (g_no_sched) |
1562 | set->flags |= BLK_MQ_F_NO_SCHED; | |
82f402fe JA |
1563 | set->driver_data = NULL; |
1564 | ||
0d06a42f | 1565 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1566 | set->flags |= BLK_MQ_F_BLOCKING; |
1567 | ||
1568 | return blk_mq_alloc_tag_set(set); | |
1569 | } | |
1570 | ||
cedcafad SL |
1571 | static void null_validate_conf(struct nullb_device *dev) |
1572 | { | |
1573 | dev->blocksize = round_down(dev->blocksize, 512); | |
1574 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad SL |
1575 | |
1576 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1577 | if (dev->submit_queues != nr_online_nodes) | |
1578 | dev->submit_queues = nr_online_nodes; | |
1579 | } else if (dev->submit_queues > nr_cpu_ids) | |
1580 | dev->submit_queues = nr_cpu_ids; | |
1581 | else if (dev->submit_queues == 0) | |
1582 | dev->submit_queues = 1; | |
1583 | ||
1584 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1585 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1586 | |
1587 | /* Do memory allocation, so set blocking */ | |
1588 | if (dev->memory_backed) | |
1589 | dev->blocking = true; | |
deb78b41 SL |
1590 | else /* cache is meaningless */ |
1591 | dev->cache_size = 0; | |
1592 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1593 | dev->cache_size); | |
eff2c4f1 SL |
1594 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1595 | /* can not stop a queue */ | |
1596 | if (dev->queue_mode == NULL_Q_BIO) | |
1597 | dev->mbps = 0; | |
cedcafad SL |
1598 | } |
1599 | ||
33f782c4 | 1600 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1601 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1602 | { | |
1603 | if (!str[0]) | |
93b57046 JA |
1604 | return true; |
1605 | ||
24941b90 | 1606 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1607 | return false; |
1608 | ||
24941b90 JA |
1609 | attr->verbose = 0; |
1610 | return true; | |
1611 | } | |
1612 | #endif | |
1613 | ||
1614 | static bool null_setup_fault(void) | |
1615 | { | |
1616 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1617 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1618 | return false; | |
1619 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1620 | return false; | |
33f782c4 | 1621 | #endif |
93b57046 JA |
1622 | return true; |
1623 | } | |
1624 | ||
2984c868 | 1625 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1626 | { |
1627 | struct nullb *nullb; | |
dc501dc0 | 1628 | int rv; |
f2298c04 | 1629 | |
cedcafad SL |
1630 | null_validate_conf(dev); |
1631 | ||
2984c868 | 1632 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1633 | if (!nullb) { |
1634 | rv = -ENOMEM; | |
24d2f903 | 1635 | goto out; |
dc501dc0 | 1636 | } |
2984c868 SL |
1637 | nullb->dev = dev; |
1638 | dev->nullb = nullb; | |
f2298c04 JA |
1639 | |
1640 | spin_lock_init(&nullb->lock); | |
1641 | ||
dc501dc0 RE |
1642 | rv = setup_queues(nullb); |
1643 | if (rv) | |
24d2f903 | 1644 | goto out_free_nullb; |
f2298c04 | 1645 | |
2984c868 | 1646 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1647 | if (shared_tags) { |
1648 | nullb->tag_set = &tag_set; | |
1649 | rv = 0; | |
1650 | } else { | |
1651 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1652 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1653 | } |
1654 | ||
dc501dc0 | 1655 | if (rv) |
24d2f903 CH |
1656 | goto out_cleanup_queues; |
1657 | ||
93b57046 JA |
1658 | if (!null_setup_fault()) |
1659 | goto out_cleanup_queues; | |
1660 | ||
5448aca4 | 1661 | nullb->tag_set->timeout = 5 * HZ; |
82f402fe | 1662 | nullb->q = blk_mq_init_queue(nullb->tag_set); |
35b489d3 | 1663 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1664 | rv = -ENOMEM; |
24d2f903 | 1665 | goto out_cleanup_tags; |
dc501dc0 | 1666 | } |
82f402fe | 1667 | null_init_queues(nullb); |
2984c868 | 1668 | } else if (dev->queue_mode == NULL_Q_BIO) { |
6d469642 | 1669 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1670 | if (!nullb->q) { |
1671 | rv = -ENOMEM; | |
24d2f903 | 1672 | goto out_cleanup_queues; |
dc501dc0 | 1673 | } |
f2298c04 | 1674 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1675 | rv = init_driver_queues(nullb); |
1676 | if (rv) | |
1677 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1678 | } |
1679 | ||
eff2c4f1 SL |
1680 | if (dev->mbps) { |
1681 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1682 | nullb_setup_bwtimer(nullb); | |
1683 | } | |
1684 | ||
deb78b41 SL |
1685 | if (dev->cache_size > 0) { |
1686 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1687 | blk_queue_write_cache(nullb->q, true, true); | |
deb78b41 SL |
1688 | } |
1689 | ||
ca4b2a01 MB |
1690 | if (dev->zoned) { |
1691 | rv = null_zone_init(dev); | |
1692 | if (rv) | |
1693 | goto out_cleanup_blk_queue; | |
1694 | ||
1695 | blk_queue_chunk_sectors(nullb->q, dev->zone_size_sects); | |
1696 | nullb->q->limits.zoned = BLK_ZONED_HM; | |
a61dbfb1 | 1697 | blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, nullb->q); |
780d97a9 DLM |
1698 | blk_queue_required_elevator_features(nullb->q, |
1699 | ELEVATOR_F_ZBD_SEQ_WRITE); | |
ca4b2a01 MB |
1700 | } |
1701 | ||
f2298c04 | 1702 | nullb->q->queuedata = nullb; |
8b904b5b BVA |
1703 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
1704 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); | |
f2298c04 | 1705 | |
f2298c04 | 1706 | mutex_lock(&lock); |
94bc02e3 | 1707 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1708 | dev->index = nullb->index; |
f2298c04 JA |
1709 | mutex_unlock(&lock); |
1710 | ||
2984c868 SL |
1711 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1712 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1713 | |
306eb6b4 | 1714 | null_config_discard(nullb); |
f2298c04 | 1715 | |
b2b7e001 MB |
1716 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1717 | ||
74ede5af | 1718 | rv = null_gendisk_register(nullb); |
9ae2d0aa | 1719 | if (rv) |
ca4b2a01 | 1720 | goto out_cleanup_zone; |
a514379b MB |
1721 | |
1722 | mutex_lock(&lock); | |
1723 | list_add_tail(&nullb->list, &nullb_list); | |
1724 | mutex_unlock(&lock); | |
3681c85d | 1725 | |
f2298c04 | 1726 | return 0; |
ca4b2a01 MB |
1727 | out_cleanup_zone: |
1728 | if (dev->zoned) | |
1729 | null_zone_exit(dev); | |
24d2f903 CH |
1730 | out_cleanup_blk_queue: |
1731 | blk_cleanup_queue(nullb->q); | |
1732 | out_cleanup_tags: | |
2984c868 | 1733 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1734 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1735 | out_cleanup_queues: |
1736 | cleanup_queues(nullb); | |
1737 | out_free_nullb: | |
1738 | kfree(nullb); | |
1739 | out: | |
dc501dc0 | 1740 | return rv; |
f2298c04 JA |
1741 | } |
1742 | ||
1743 | static int __init null_init(void) | |
1744 | { | |
af096e22 | 1745 | int ret = 0; |
f2298c04 | 1746 | unsigned int i; |
af096e22 | 1747 | struct nullb *nullb; |
2984c868 | 1748 | struct nullb_device *dev; |
f2298c04 | 1749 | |
2984c868 | 1750 | if (g_bs > PAGE_SIZE) { |
9967d8ac R |
1751 | pr_warn("null_blk: invalid block size\n"); |
1752 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1753 | g_bs = PAGE_SIZE; |
9967d8ac | 1754 | } |
f2298c04 | 1755 | |
ca4b2a01 MB |
1756 | if (!is_power_of_2(g_zone_size)) { |
1757 | pr_err("null_blk: zone_size must be power-of-two\n"); | |
1758 | return -EINVAL; | |
1759 | } | |
1760 | ||
7ff684a6 JP |
1761 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
1762 | pr_err("null_blk: invalid home_node value\n"); | |
1763 | g_home_node = NUMA_NO_NODE; | |
1764 | } | |
1765 | ||
e50b1e32 JA |
1766 | if (g_queue_mode == NULL_Q_RQ) { |
1767 | pr_err("null_blk: legacy IO path no longer available\n"); | |
1768 | return -EINVAL; | |
1769 | } | |
2984c868 SL |
1770 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1771 | if (g_submit_queues != nr_online_nodes) { | |
558ab300 | 1772 | pr_warn("null_blk: submit_queues param is set to %u.\n", |
d15ee6b1 | 1773 | nr_online_nodes); |
2984c868 | 1774 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1775 | } |
2984c868 SL |
1776 | } else if (g_submit_queues > nr_cpu_ids) |
1777 | g_submit_queues = nr_cpu_ids; | |
1778 | else if (g_submit_queues <= 0) | |
1779 | g_submit_queues = 1; | |
f2298c04 | 1780 | |
2984c868 SL |
1781 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1782 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1783 | if (ret) |
1784 | return ret; | |
1785 | } | |
1786 | ||
3bf2bd20 SL |
1787 | config_group_init(&nullb_subsys.su_group); |
1788 | mutex_init(&nullb_subsys.su_mutex); | |
1789 | ||
1790 | ret = configfs_register_subsystem(&nullb_subsys); | |
1791 | if (ret) | |
1792 | goto err_tagset; | |
1793 | ||
f2298c04 JA |
1794 | mutex_init(&lock); |
1795 | ||
f2298c04 | 1796 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1797 | if (null_major < 0) { |
1798 | ret = null_major; | |
3bf2bd20 | 1799 | goto err_conf; |
db2d153d | 1800 | } |
f2298c04 JA |
1801 | |
1802 | for (i = 0; i < nr_devices; i++) { | |
2984c868 | 1803 | dev = null_alloc_dev(); |
30c516d7 WY |
1804 | if (!dev) { |
1805 | ret = -ENOMEM; | |
2984c868 | 1806 | goto err_dev; |
30c516d7 | 1807 | } |
2984c868 SL |
1808 | ret = null_add_dev(dev); |
1809 | if (ret) { | |
1810 | null_free_dev(dev); | |
af096e22 | 1811 | goto err_dev; |
2984c868 | 1812 | } |
f2298c04 JA |
1813 | } |
1814 | ||
4e47ee8f | 1815 | pr_info("null_blk: module loaded\n"); |
f2298c04 | 1816 | return 0; |
af096e22 MH |
1817 | |
1818 | err_dev: | |
1819 | while (!list_empty(&nullb_list)) { | |
1820 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 1821 | dev = nullb->dev; |
af096e22 | 1822 | null_del_dev(nullb); |
2984c868 | 1823 | null_free_dev(dev); |
af096e22 | 1824 | } |
af096e22 | 1825 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
1826 | err_conf: |
1827 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 1828 | err_tagset: |
2984c868 | 1829 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 1830 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 1831 | return ret; |
f2298c04 JA |
1832 | } |
1833 | ||
1834 | static void __exit null_exit(void) | |
1835 | { | |
1836 | struct nullb *nullb; | |
1837 | ||
3bf2bd20 SL |
1838 | configfs_unregister_subsystem(&nullb_subsys); |
1839 | ||
f2298c04 JA |
1840 | unregister_blkdev(null_major, "nullb"); |
1841 | ||
1842 | mutex_lock(&lock); | |
1843 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
1844 | struct nullb_device *dev; |
1845 | ||
f2298c04 | 1846 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 1847 | dev = nullb->dev; |
f2298c04 | 1848 | null_del_dev(nullb); |
2984c868 | 1849 | null_free_dev(dev); |
f2298c04 JA |
1850 | } |
1851 | mutex_unlock(&lock); | |
6bb9535b | 1852 | |
2984c868 | 1853 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe | 1854 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
1855 | } |
1856 | ||
1857 | module_init(null_init); | |
1858 | module_exit(null_exit); | |
1859 | ||
231b3db1 | 1860 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 1861 | MODULE_LICENSE("GPL"); |