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Commit | Line | Data |
---|---|---|
3bf2bd20 SL |
1 | /* |
2 | * Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and | |
3 | * Shaohua Li <shli@fb.com> | |
4 | */ | |
f2298c04 | 5 | #include <linux/module.h> |
fc1bc354 | 6 | |
f2298c04 JA |
7 | #include <linux/moduleparam.h> |
8 | #include <linux/sched.h> | |
9 | #include <linux/fs.h> | |
f2298c04 | 10 | #include <linux/init.h> |
6dad38d3 | 11 | #include "null_blk.h" |
f2298c04 | 12 | |
5bcd0e0c SL |
13 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) |
14 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) | |
5bcd0e0c SL |
15 | #define SECTOR_MASK (PAGE_SECTORS - 1) |
16 | ||
17 | #define FREE_BATCH 16 | |
18 | ||
eff2c4f1 SL |
19 | #define TICKS_PER_SEC 50ULL |
20 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
21 | ||
33f782c4 | 22 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 23 | static DECLARE_FAULT_ATTR(null_timeout_attr); |
24941b90 | 24 | static DECLARE_FAULT_ATTR(null_requeue_attr); |
33f782c4 | 25 | #endif |
93b57046 | 26 | |
eff2c4f1 SL |
27 | static inline u64 mb_per_tick(int mbps) |
28 | { | |
29 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
30 | } | |
f2298c04 | 31 | |
3bf2bd20 SL |
32 | /* |
33 | * Status flags for nullb_device. | |
34 | * | |
35 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
36 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 37 | * THROTTLED: Device is being throttled. |
deb78b41 | 38 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
39 | */ |
40 | enum nullb_device_flags { | |
41 | NULLB_DEV_FL_CONFIGURED = 0, | |
42 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 43 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 44 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
45 | }; |
46 | ||
66231ad3 | 47 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
48 | /* |
49 | * nullb_page is a page in memory for nullb devices. | |
50 | * | |
51 | * @page: The page holding the data. | |
52 | * @bitmap: The bitmap represents which sector in the page has data. | |
53 | * Each bit represents one block size. For example, sector 8 | |
54 | * will use the 7th bit | |
deb78b41 SL |
55 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
56 | * page is being flushing to storage. FREE means the cache page is freed and | |
57 | * should be skipped from flushing to storage. Please see | |
58 | * null_make_cache_space | |
5bcd0e0c SL |
59 | */ |
60 | struct nullb_page { | |
61 | struct page *page; | |
66231ad3 | 62 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 63 | }; |
66231ad3 ML |
64 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
65 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 66 | |
f2298c04 JA |
67 | static LIST_HEAD(nullb_list); |
68 | static struct mutex lock; | |
69 | static int null_major; | |
94bc02e3 | 70 | static DEFINE_IDA(nullb_indexes); |
82f402fe | 71 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 72 | |
f2298c04 JA |
73 | enum { |
74 | NULL_IRQ_NONE = 0, | |
75 | NULL_IRQ_SOFTIRQ = 1, | |
76 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 77 | }; |
f2298c04 | 78 | |
ce2c350b | 79 | enum { |
f2298c04 JA |
80 | NULL_Q_BIO = 0, |
81 | NULL_Q_RQ = 1, | |
82 | NULL_Q_MQ = 2, | |
83 | }; | |
84 | ||
b3cffc38 | 85 | static int g_no_sched; |
5657a819 | 86 | module_param_named(no_sched, g_no_sched, int, 0444); |
b3cffc38 | 87 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
88 | ||
2984c868 | 89 | static int g_submit_queues = 1; |
5657a819 | 90 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
f2298c04 JA |
91 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
92 | ||
2984c868 | 93 | static int g_home_node = NUMA_NO_NODE; |
5657a819 | 94 | module_param_named(home_node, g_home_node, int, 0444); |
f2298c04 JA |
95 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
96 | ||
33f782c4 | 97 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 98 | static char g_timeout_str[80]; |
5657a819 | 99 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
24941b90 JA |
100 | |
101 | static char g_requeue_str[80]; | |
5657a819 | 102 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
33f782c4 | 103 | #endif |
93b57046 | 104 | |
2984c868 | 105 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
106 | |
107 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
108 | { | |
109 | int ret, new_val; | |
110 | ||
111 | ret = kstrtoint(str, 10, &new_val); | |
112 | if (ret) | |
113 | return -EINVAL; | |
114 | ||
115 | if (new_val < min || new_val > max) | |
116 | return -EINVAL; | |
117 | ||
118 | *val = new_val; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
123 | { | |
2984c868 | 124 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
125 | } |
126 | ||
9c27847d | 127 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
128 | .set = null_set_queue_mode, |
129 | .get = param_get_int, | |
130 | }; | |
131 | ||
5657a819 | 132 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
54ae81cd | 133 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 134 | |
2984c868 | 135 | static int g_gb = 250; |
5657a819 | 136 | module_param_named(gb, g_gb, int, 0444); |
f2298c04 JA |
137 | MODULE_PARM_DESC(gb, "Size in GB"); |
138 | ||
2984c868 | 139 | static int g_bs = 512; |
5657a819 | 140 | module_param_named(bs, g_bs, int, 0444); |
f2298c04 JA |
141 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
142 | ||
82f402fe | 143 | static int nr_devices = 1; |
5657a819 | 144 | module_param(nr_devices, int, 0444); |
f2298c04 JA |
145 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
146 | ||
2984c868 | 147 | static bool g_blocking; |
5657a819 | 148 | module_param_named(blocking, g_blocking, bool, 0444); |
db5bcf87 JA |
149 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
150 | ||
82f402fe | 151 | static bool shared_tags; |
5657a819 | 152 | module_param(shared_tags, bool, 0444); |
82f402fe JA |
153 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
154 | ||
2984c868 | 155 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
156 | |
157 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
158 | { | |
2984c868 | 159 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
160 | NULL_IRQ_TIMER); |
161 | } | |
162 | ||
9c27847d | 163 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
164 | .set = null_set_irqmode, |
165 | .get = param_get_int, | |
166 | }; | |
167 | ||
5657a819 | 168 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
f2298c04 JA |
169 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
170 | ||
2984c868 | 171 | static unsigned long g_completion_nsec = 10000; |
5657a819 | 172 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
f2298c04 JA |
173 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
174 | ||
2984c868 | 175 | static int g_hw_queue_depth = 64; |
5657a819 | 176 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
f2298c04 JA |
177 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
178 | ||
2984c868 | 179 | static bool g_use_per_node_hctx; |
5657a819 | 180 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
20005244 | 181 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 182 | |
ca4b2a01 MB |
183 | static bool g_zoned; |
184 | module_param_named(zoned, g_zoned, bool, S_IRUGO); | |
185 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); | |
186 | ||
187 | static unsigned long g_zone_size = 256; | |
188 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); | |
189 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); | |
190 | ||
ea2c18e1 MS |
191 | static unsigned int g_zone_nr_conv; |
192 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); | |
193 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); | |
194 | ||
3bf2bd20 SL |
195 | static struct nullb_device *null_alloc_dev(void); |
196 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
197 | static void null_del_dev(struct nullb *nullb); |
198 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 199 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
200 | |
201 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
202 | { | |
203 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
204 | } | |
205 | ||
206 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
207 | { | |
208 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
209 | } | |
210 | ||
211 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
212 | char *page) | |
213 | { | |
214 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
215 | } | |
216 | ||
217 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
218 | { | |
219 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
220 | } | |
221 | ||
222 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
223 | const char *page, size_t count) | |
224 | { | |
225 | unsigned int tmp; | |
226 | int result; | |
227 | ||
228 | result = kstrtouint(page, 0, &tmp); | |
229 | if (result) | |
230 | return result; | |
231 | ||
232 | *val = tmp; | |
233 | return count; | |
234 | } | |
235 | ||
236 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
237 | const char *page, size_t count) | |
238 | { | |
239 | int result; | |
240 | unsigned long tmp; | |
241 | ||
242 | result = kstrtoul(page, 0, &tmp); | |
243 | if (result) | |
244 | return result; | |
245 | ||
246 | *val = tmp; | |
247 | return count; | |
248 | } | |
249 | ||
250 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
251 | size_t count) | |
252 | { | |
253 | bool tmp; | |
254 | int result; | |
255 | ||
256 | result = kstrtobool(page, &tmp); | |
257 | if (result) | |
258 | return result; | |
259 | ||
260 | *val = tmp; | |
261 | return count; | |
262 | } | |
263 | ||
264 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
265 | #define NULLB_DEVICE_ATTR(NAME, TYPE) \ | |
266 | static ssize_t \ | |
267 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
268 | { \ | |
269 | return nullb_device_##TYPE##_attr_show( \ | |
270 | to_nullb_device(item)->NAME, page); \ | |
271 | } \ | |
272 | static ssize_t \ | |
273 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
274 | size_t count) \ | |
275 | { \ | |
276 | if (test_bit(NULLB_DEV_FL_CONFIGURED, &to_nullb_device(item)->flags)) \ | |
277 | return -EBUSY; \ | |
278 | return nullb_device_##TYPE##_attr_store( \ | |
279 | &to_nullb_device(item)->NAME, page, count); \ | |
280 | } \ | |
281 | CONFIGFS_ATTR(nullb_device_, NAME); | |
282 | ||
283 | NULLB_DEVICE_ATTR(size, ulong); | |
284 | NULLB_DEVICE_ATTR(completion_nsec, ulong); | |
285 | NULLB_DEVICE_ATTR(submit_queues, uint); | |
286 | NULLB_DEVICE_ATTR(home_node, uint); | |
287 | NULLB_DEVICE_ATTR(queue_mode, uint); | |
288 | NULLB_DEVICE_ATTR(blocksize, uint); | |
289 | NULLB_DEVICE_ATTR(irqmode, uint); | |
290 | NULLB_DEVICE_ATTR(hw_queue_depth, uint); | |
cedcafad | 291 | NULLB_DEVICE_ATTR(index, uint); |
3bf2bd20 SL |
292 | NULLB_DEVICE_ATTR(blocking, bool); |
293 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool); | |
5bcd0e0c | 294 | NULLB_DEVICE_ATTR(memory_backed, bool); |
306eb6b4 | 295 | NULLB_DEVICE_ATTR(discard, bool); |
eff2c4f1 | 296 | NULLB_DEVICE_ATTR(mbps, uint); |
deb78b41 | 297 | NULLB_DEVICE_ATTR(cache_size, ulong); |
ca4b2a01 MB |
298 | NULLB_DEVICE_ATTR(zoned, bool); |
299 | NULLB_DEVICE_ATTR(zone_size, ulong); | |
ea2c18e1 | 300 | NULLB_DEVICE_ATTR(zone_nr_conv, uint); |
3bf2bd20 | 301 | |
cedcafad SL |
302 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
303 | { | |
304 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
305 | } | |
306 | ||
307 | static ssize_t nullb_device_power_store(struct config_item *item, | |
308 | const char *page, size_t count) | |
309 | { | |
310 | struct nullb_device *dev = to_nullb_device(item); | |
311 | bool newp = false; | |
312 | ssize_t ret; | |
313 | ||
314 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
315 | if (ret < 0) | |
316 | return ret; | |
317 | ||
318 | if (!dev->power && newp) { | |
319 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
320 | return count; | |
321 | if (null_add_dev(dev)) { | |
322 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
323 | return -ENOMEM; | |
324 | } | |
325 | ||
326 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
327 | dev->power = newp; | |
b3c30512 | 328 | } else if (dev->power && !newp) { |
cedcafad SL |
329 | mutex_lock(&lock); |
330 | dev->power = newp; | |
331 | null_del_dev(dev->nullb); | |
332 | mutex_unlock(&lock); | |
333 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
00a8cdb8 | 334 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
335 | } |
336 | ||
337 | return count; | |
338 | } | |
339 | ||
340 | CONFIGFS_ATTR(nullb_device_, power); | |
341 | ||
2f54a613 SL |
342 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
343 | { | |
344 | struct nullb_device *t_dev = to_nullb_device(item); | |
345 | ||
346 | return badblocks_show(&t_dev->badblocks, page, 0); | |
347 | } | |
348 | ||
349 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
350 | const char *page, size_t count) | |
351 | { | |
352 | struct nullb_device *t_dev = to_nullb_device(item); | |
353 | char *orig, *buf, *tmp; | |
354 | u64 start, end; | |
355 | int ret; | |
356 | ||
357 | orig = kstrndup(page, count, GFP_KERNEL); | |
358 | if (!orig) | |
359 | return -ENOMEM; | |
360 | ||
361 | buf = strstrip(orig); | |
362 | ||
363 | ret = -EINVAL; | |
364 | if (buf[0] != '+' && buf[0] != '-') | |
365 | goto out; | |
366 | tmp = strchr(&buf[1], '-'); | |
367 | if (!tmp) | |
368 | goto out; | |
369 | *tmp = '\0'; | |
370 | ret = kstrtoull(buf + 1, 0, &start); | |
371 | if (ret) | |
372 | goto out; | |
373 | ret = kstrtoull(tmp + 1, 0, &end); | |
374 | if (ret) | |
375 | goto out; | |
376 | ret = -EINVAL; | |
377 | if (start > end) | |
378 | goto out; | |
379 | /* enable badblocks */ | |
380 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
381 | if (buf[0] == '+') | |
382 | ret = badblocks_set(&t_dev->badblocks, start, | |
383 | end - start + 1, 1); | |
384 | else | |
385 | ret = badblocks_clear(&t_dev->badblocks, start, | |
386 | end - start + 1); | |
387 | if (ret == 0) | |
388 | ret = count; | |
389 | out: | |
390 | kfree(orig); | |
391 | return ret; | |
392 | } | |
393 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
394 | ||
3bf2bd20 SL |
395 | static struct configfs_attribute *nullb_device_attrs[] = { |
396 | &nullb_device_attr_size, | |
397 | &nullb_device_attr_completion_nsec, | |
398 | &nullb_device_attr_submit_queues, | |
399 | &nullb_device_attr_home_node, | |
400 | &nullb_device_attr_queue_mode, | |
401 | &nullb_device_attr_blocksize, | |
402 | &nullb_device_attr_irqmode, | |
403 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 404 | &nullb_device_attr_index, |
3bf2bd20 SL |
405 | &nullb_device_attr_blocking, |
406 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 407 | &nullb_device_attr_power, |
5bcd0e0c | 408 | &nullb_device_attr_memory_backed, |
306eb6b4 | 409 | &nullb_device_attr_discard, |
eff2c4f1 | 410 | &nullb_device_attr_mbps, |
deb78b41 | 411 | &nullb_device_attr_cache_size, |
2f54a613 | 412 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
413 | &nullb_device_attr_zoned, |
414 | &nullb_device_attr_zone_size, | |
ea2c18e1 | 415 | &nullb_device_attr_zone_nr_conv, |
3bf2bd20 SL |
416 | NULL, |
417 | }; | |
418 | ||
419 | static void nullb_device_release(struct config_item *item) | |
420 | { | |
5bcd0e0c SL |
421 | struct nullb_device *dev = to_nullb_device(item); |
422 | ||
deb78b41 | 423 | null_free_device_storage(dev, false); |
5bcd0e0c | 424 | null_free_dev(dev); |
3bf2bd20 SL |
425 | } |
426 | ||
427 | static struct configfs_item_operations nullb_device_ops = { | |
428 | .release = nullb_device_release, | |
429 | }; | |
430 | ||
e1919dff | 431 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
432 | .ct_item_ops = &nullb_device_ops, |
433 | .ct_attrs = nullb_device_attrs, | |
434 | .ct_owner = THIS_MODULE, | |
435 | }; | |
436 | ||
437 | static struct | |
438 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
439 | { | |
440 | struct nullb_device *dev; | |
441 | ||
442 | dev = null_alloc_dev(); | |
443 | if (!dev) | |
444 | return ERR_PTR(-ENOMEM); | |
445 | ||
446 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
447 | ||
448 | return &dev->item; | |
449 | } | |
450 | ||
451 | static void | |
452 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
453 | { | |
cedcafad SL |
454 | struct nullb_device *dev = to_nullb_device(item); |
455 | ||
456 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
457 | mutex_lock(&lock); | |
458 | dev->power = false; | |
459 | null_del_dev(dev->nullb); | |
460 | mutex_unlock(&lock); | |
461 | } | |
462 | ||
3bf2bd20 SL |
463 | config_item_put(item); |
464 | } | |
465 | ||
466 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
467 | { | |
ca4b2a01 | 468 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size\n"); |
3bf2bd20 SL |
469 | } |
470 | ||
471 | CONFIGFS_ATTR_RO(memb_group_, features); | |
472 | ||
473 | static struct configfs_attribute *nullb_group_attrs[] = { | |
474 | &memb_group_attr_features, | |
475 | NULL, | |
476 | }; | |
477 | ||
478 | static struct configfs_group_operations nullb_group_ops = { | |
479 | .make_item = nullb_group_make_item, | |
480 | .drop_item = nullb_group_drop_item, | |
481 | }; | |
482 | ||
e1919dff | 483 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
484 | .ct_group_ops = &nullb_group_ops, |
485 | .ct_attrs = nullb_group_attrs, | |
486 | .ct_owner = THIS_MODULE, | |
487 | }; | |
488 | ||
489 | static struct configfs_subsystem nullb_subsys = { | |
490 | .su_group = { | |
491 | .cg_item = { | |
492 | .ci_namebuf = "nullb", | |
493 | .ci_type = &nullb_group_type, | |
494 | }, | |
495 | }, | |
496 | }; | |
497 | ||
deb78b41 SL |
498 | static inline int null_cache_active(struct nullb *nullb) |
499 | { | |
500 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
501 | } | |
502 | ||
2984c868 SL |
503 | static struct nullb_device *null_alloc_dev(void) |
504 | { | |
505 | struct nullb_device *dev; | |
506 | ||
507 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
508 | if (!dev) | |
509 | return NULL; | |
5bcd0e0c | 510 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 511 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
512 | if (badblocks_init(&dev->badblocks, 0)) { |
513 | kfree(dev); | |
514 | return NULL; | |
515 | } | |
516 | ||
2984c868 SL |
517 | dev->size = g_gb * 1024; |
518 | dev->completion_nsec = g_completion_nsec; | |
519 | dev->submit_queues = g_submit_queues; | |
520 | dev->home_node = g_home_node; | |
521 | dev->queue_mode = g_queue_mode; | |
522 | dev->blocksize = g_bs; | |
523 | dev->irqmode = g_irqmode; | |
524 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 SL |
525 | dev->blocking = g_blocking; |
526 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
ca4b2a01 MB |
527 | dev->zoned = g_zoned; |
528 | dev->zone_size = g_zone_size; | |
ea2c18e1 | 529 | dev->zone_nr_conv = g_zone_nr_conv; |
2984c868 SL |
530 | return dev; |
531 | } | |
532 | ||
533 | static void null_free_dev(struct nullb_device *dev) | |
534 | { | |
1addb798 DD |
535 | if (!dev) |
536 | return; | |
537 | ||
ca4b2a01 | 538 | null_zone_exit(dev); |
1addb798 | 539 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
540 | kfree(dev); |
541 | } | |
542 | ||
f2298c04 JA |
543 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
544 | { | |
545 | clear_bit_unlock(tag, nq->tag_map); | |
546 | ||
547 | if (waitqueue_active(&nq->wait)) | |
548 | wake_up(&nq->wait); | |
549 | } | |
550 | ||
551 | static unsigned int get_tag(struct nullb_queue *nq) | |
552 | { | |
553 | unsigned int tag; | |
554 | ||
555 | do { | |
556 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
557 | if (tag >= nq->queue_depth) | |
558 | return -1U; | |
559 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
560 | ||
561 | return tag; | |
562 | } | |
563 | ||
564 | static void free_cmd(struct nullb_cmd *cmd) | |
565 | { | |
566 | put_tag(cmd->nq, cmd->tag); | |
567 | } | |
568 | ||
3c395a96 PV |
569 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
570 | ||
f2298c04 JA |
571 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
572 | { | |
573 | struct nullb_cmd *cmd; | |
574 | unsigned int tag; | |
575 | ||
576 | tag = get_tag(nq); | |
577 | if (tag != -1U) { | |
578 | cmd = &nq->cmds[tag]; | |
579 | cmd->tag = tag; | |
580 | cmd->nq = nq; | |
2984c868 | 581 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
582 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
583 | HRTIMER_MODE_REL); | |
584 | cmd->timer.function = null_cmd_timer_expired; | |
585 | } | |
f2298c04 JA |
586 | return cmd; |
587 | } | |
588 | ||
589 | return NULL; | |
590 | } | |
591 | ||
592 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
593 | { | |
594 | struct nullb_cmd *cmd; | |
595 | DEFINE_WAIT(wait); | |
596 | ||
597 | cmd = __alloc_cmd(nq); | |
598 | if (cmd || !can_wait) | |
599 | return cmd; | |
600 | ||
601 | do { | |
602 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
603 | cmd = __alloc_cmd(nq); | |
604 | if (cmd) | |
605 | break; | |
606 | ||
607 | io_schedule(); | |
608 | } while (1); | |
609 | ||
610 | finish_wait(&nq->wait, &wait); | |
611 | return cmd; | |
612 | } | |
613 | ||
614 | static void end_cmd(struct nullb_cmd *cmd) | |
615 | { | |
2984c868 | 616 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 617 | |
ce2c350b CH |
618 | switch (queue_mode) { |
619 | case NULL_Q_MQ: | |
5bcd0e0c | 620 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b | 621 | return; |
ce2c350b | 622 | case NULL_Q_BIO: |
5bcd0e0c | 623 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 624 | bio_endio(cmd->bio); |
48cc661e | 625 | break; |
ce2c350b | 626 | } |
f2298c04 | 627 | |
48cc661e | 628 | free_cmd(cmd); |
cf8ecc5a AA |
629 | } |
630 | ||
631 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
632 | { | |
633 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
634 | |
635 | return HRTIMER_NORESTART; | |
636 | } | |
637 | ||
638 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
639 | { | |
2984c868 | 640 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 641 | |
3c395a96 | 642 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
643 | } |
644 | ||
49f66136 | 645 | static void null_complete_rq(struct request *rq) |
f2298c04 | 646 | { |
49f66136 | 647 | end_cmd(blk_mq_rq_to_pdu(rq)); |
f2298c04 JA |
648 | } |
649 | ||
5bcd0e0c SL |
650 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
651 | { | |
652 | struct nullb_page *t_page; | |
653 | ||
654 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
655 | if (!t_page) | |
656 | goto out; | |
657 | ||
658 | t_page->page = alloc_pages(gfp_flags, 0); | |
659 | if (!t_page->page) | |
660 | goto out_freepage; | |
661 | ||
66231ad3 | 662 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
663 | return t_page; |
664 | out_freepage: | |
665 | kfree(t_page); | |
666 | out: | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | static void null_free_page(struct nullb_page *t_page) | |
671 | { | |
66231ad3 ML |
672 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
673 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 674 | return; |
5bcd0e0c SL |
675 | __free_page(t_page->page); |
676 | kfree(t_page); | |
677 | } | |
678 | ||
66231ad3 ML |
679 | static bool null_page_empty(struct nullb_page *page) |
680 | { | |
681 | int size = MAP_SZ - 2; | |
682 | ||
683 | return find_first_bit(page->bitmap, size) == size; | |
684 | } | |
685 | ||
deb78b41 SL |
686 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
687 | bool is_cache) | |
5bcd0e0c SL |
688 | { |
689 | unsigned int sector_bit; | |
690 | u64 idx; | |
691 | struct nullb_page *t_page, *ret; | |
692 | struct radix_tree_root *root; | |
693 | ||
deb78b41 | 694 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
695 | idx = sector >> PAGE_SECTORS_SHIFT; |
696 | sector_bit = (sector & SECTOR_MASK); | |
697 | ||
698 | t_page = radix_tree_lookup(root, idx); | |
699 | if (t_page) { | |
66231ad3 | 700 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 701 | |
66231ad3 | 702 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
703 | ret = radix_tree_delete_item(root, idx, t_page); |
704 | WARN_ON(ret != t_page); | |
705 | null_free_page(ret); | |
deb78b41 SL |
706 | if (is_cache) |
707 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
708 | } |
709 | } | |
710 | } | |
711 | ||
712 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 713 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
714 | { |
715 | struct radix_tree_root *root; | |
716 | ||
deb78b41 | 717 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
718 | |
719 | if (radix_tree_insert(root, idx, t_page)) { | |
720 | null_free_page(t_page); | |
721 | t_page = radix_tree_lookup(root, idx); | |
722 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
723 | } else if (is_cache) |
724 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
725 | |
726 | return t_page; | |
727 | } | |
728 | ||
deb78b41 | 729 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
730 | { |
731 | unsigned long pos = 0; | |
732 | int nr_pages; | |
733 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
734 | struct radix_tree_root *root; | |
735 | ||
deb78b41 | 736 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
737 | |
738 | do { | |
739 | int i; | |
740 | ||
741 | nr_pages = radix_tree_gang_lookup(root, | |
742 | (void **)t_pages, pos, FREE_BATCH); | |
743 | ||
744 | for (i = 0; i < nr_pages; i++) { | |
745 | pos = t_pages[i]->page->index; | |
746 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
747 | WARN_ON(ret != t_pages[i]); | |
748 | null_free_page(ret); | |
749 | } | |
750 | ||
751 | pos++; | |
752 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
753 | |
754 | if (is_cache) | |
755 | dev->curr_cache = 0; | |
5bcd0e0c SL |
756 | } |
757 | ||
deb78b41 SL |
758 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
759 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
760 | { |
761 | unsigned int sector_bit; | |
762 | u64 idx; | |
763 | struct nullb_page *t_page; | |
deb78b41 | 764 | struct radix_tree_root *root; |
5bcd0e0c SL |
765 | |
766 | idx = sector >> PAGE_SECTORS_SHIFT; | |
767 | sector_bit = (sector & SECTOR_MASK); | |
768 | ||
deb78b41 SL |
769 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
770 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
771 | WARN_ON(t_page && t_page->page->index != idx); |
772 | ||
66231ad3 | 773 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
774 | return t_page; |
775 | ||
776 | return NULL; | |
777 | } | |
778 | ||
deb78b41 SL |
779 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
780 | sector_t sector, bool for_write, bool ignore_cache) | |
781 | { | |
782 | struct nullb_page *page = NULL; | |
783 | ||
784 | if (!ignore_cache) | |
785 | page = __null_lookup_page(nullb, sector, for_write, true); | |
786 | if (page) | |
787 | return page; | |
788 | return __null_lookup_page(nullb, sector, for_write, false); | |
789 | } | |
790 | ||
5bcd0e0c | 791 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
792 | sector_t sector, bool ignore_cache) |
793 | __releases(&nullb->lock) | |
794 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
795 | { |
796 | u64 idx; | |
797 | struct nullb_page *t_page; | |
798 | ||
deb78b41 | 799 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
800 | if (t_page) |
801 | return t_page; | |
802 | ||
803 | spin_unlock_irq(&nullb->lock); | |
804 | ||
805 | t_page = null_alloc_page(GFP_NOIO); | |
806 | if (!t_page) | |
807 | goto out_lock; | |
808 | ||
809 | if (radix_tree_preload(GFP_NOIO)) | |
810 | goto out_freepage; | |
811 | ||
812 | spin_lock_irq(&nullb->lock); | |
813 | idx = sector >> PAGE_SECTORS_SHIFT; | |
814 | t_page->page->index = idx; | |
deb78b41 | 815 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
816 | radix_tree_preload_end(); |
817 | ||
818 | return t_page; | |
819 | out_freepage: | |
820 | null_free_page(t_page); | |
821 | out_lock: | |
822 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
823 | return null_lookup_page(nullb, sector, true, ignore_cache); |
824 | } | |
825 | ||
826 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
827 | { | |
828 | int i; | |
829 | unsigned int offset; | |
830 | u64 idx; | |
831 | struct nullb_page *t_page, *ret; | |
832 | void *dst, *src; | |
833 | ||
834 | idx = c_page->page->index; | |
835 | ||
836 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
837 | ||
66231ad3 ML |
838 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
839 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 840 | null_free_page(c_page); |
66231ad3 | 841 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
842 | ret = radix_tree_delete_item(&nullb->dev->data, |
843 | idx, t_page); | |
844 | null_free_page(t_page); | |
845 | } | |
846 | return 0; | |
847 | } | |
848 | ||
849 | if (!t_page) | |
850 | return -ENOMEM; | |
851 | ||
852 | src = kmap_atomic(c_page->page); | |
853 | dst = kmap_atomic(t_page->page); | |
854 | ||
855 | for (i = 0; i < PAGE_SECTORS; | |
856 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 857 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
858 | offset = (i << SECTOR_SHIFT); |
859 | memcpy(dst + offset, src + offset, | |
860 | nullb->dev->blocksize); | |
66231ad3 | 861 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
862 | } |
863 | } | |
864 | ||
865 | kunmap_atomic(dst); | |
866 | kunmap_atomic(src); | |
867 | ||
868 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
869 | null_free_page(ret); | |
870 | nullb->dev->curr_cache -= PAGE_SIZE; | |
871 | ||
872 | return 0; | |
873 | } | |
874 | ||
875 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 876 | { |
deb78b41 SL |
877 | int i, err, nr_pages; |
878 | struct nullb_page *c_pages[FREE_BATCH]; | |
879 | unsigned long flushed = 0, one_round; | |
880 | ||
881 | again: | |
882 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
883 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
884 | return 0; | |
885 | ||
886 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
887 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
888 | /* | |
889 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
890 | * avoid race, we don't allow page free | |
891 | */ | |
892 | for (i = 0; i < nr_pages; i++) { | |
893 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
894 | /* | |
895 | * We found the page which is being flushed to disk by other | |
896 | * threads | |
897 | */ | |
66231ad3 | 898 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
899 | c_pages[i] = NULL; |
900 | else | |
66231ad3 | 901 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
902 | } |
903 | ||
904 | one_round = 0; | |
905 | for (i = 0; i < nr_pages; i++) { | |
906 | if (c_pages[i] == NULL) | |
907 | continue; | |
908 | err = null_flush_cache_page(nullb, c_pages[i]); | |
909 | if (err) | |
910 | return err; | |
911 | one_round++; | |
912 | } | |
913 | flushed += one_round << PAGE_SHIFT; | |
914 | ||
915 | if (n > flushed) { | |
916 | if (nr_pages == 0) | |
917 | nullb->cache_flush_pos = 0; | |
918 | if (one_round == 0) { | |
919 | /* give other threads a chance */ | |
920 | spin_unlock_irq(&nullb->lock); | |
921 | spin_lock_irq(&nullb->lock); | |
922 | } | |
923 | goto again; | |
924 | } | |
925 | return 0; | |
5bcd0e0c SL |
926 | } |
927 | ||
928 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 929 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
930 | { |
931 | size_t temp, count = 0; | |
932 | unsigned int offset; | |
933 | struct nullb_page *t_page; | |
934 | void *dst, *src; | |
935 | ||
936 | while (count < n) { | |
937 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
938 | ||
deb78b41 SL |
939 | if (null_cache_active(nullb) && !is_fua) |
940 | null_make_cache_space(nullb, PAGE_SIZE); | |
941 | ||
5bcd0e0c | 942 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
943 | t_page = null_insert_page(nullb, sector, |
944 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
945 | if (!t_page) |
946 | return -ENOSPC; | |
947 | ||
948 | src = kmap_atomic(source); | |
949 | dst = kmap_atomic(t_page->page); | |
950 | memcpy(dst + offset, src + off + count, temp); | |
951 | kunmap_atomic(dst); | |
952 | kunmap_atomic(src); | |
953 | ||
66231ad3 | 954 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 955 | |
deb78b41 SL |
956 | if (is_fua) |
957 | null_free_sector(nullb, sector, true); | |
958 | ||
5bcd0e0c SL |
959 | count += temp; |
960 | sector += temp >> SECTOR_SHIFT; | |
961 | } | |
962 | return 0; | |
963 | } | |
964 | ||
965 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
966 | unsigned int off, sector_t sector, size_t n) | |
967 | { | |
968 | size_t temp, count = 0; | |
969 | unsigned int offset; | |
970 | struct nullb_page *t_page; | |
971 | void *dst, *src; | |
972 | ||
973 | while (count < n) { | |
974 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
975 | ||
976 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
977 | t_page = null_lookup_page(nullb, sector, false, |
978 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
979 | |
980 | dst = kmap_atomic(dest); | |
981 | if (!t_page) { | |
982 | memset(dst + off + count, 0, temp); | |
983 | goto next; | |
984 | } | |
985 | src = kmap_atomic(t_page->page); | |
986 | memcpy(dst + off + count, src + offset, temp); | |
987 | kunmap_atomic(src); | |
988 | next: | |
989 | kunmap_atomic(dst); | |
990 | ||
991 | count += temp; | |
992 | sector += temp >> SECTOR_SHIFT; | |
993 | } | |
994 | return 0; | |
995 | } | |
996 | ||
306eb6b4 SL |
997 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
998 | { | |
999 | size_t temp; | |
1000 | ||
1001 | spin_lock_irq(&nullb->lock); | |
1002 | while (n > 0) { | |
1003 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1004 | null_free_sector(nullb, sector, false); |
1005 | if (null_cache_active(nullb)) | |
1006 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1007 | sector += temp >> SECTOR_SHIFT; |
1008 | n -= temp; | |
1009 | } | |
1010 | spin_unlock_irq(&nullb->lock); | |
1011 | } | |
1012 | ||
deb78b41 SL |
1013 | static int null_handle_flush(struct nullb *nullb) |
1014 | { | |
1015 | int err; | |
1016 | ||
1017 | if (!null_cache_active(nullb)) | |
1018 | return 0; | |
1019 | ||
1020 | spin_lock_irq(&nullb->lock); | |
1021 | while (true) { | |
1022 | err = null_make_cache_space(nullb, | |
1023 | nullb->dev->cache_size * 1024 * 1024); | |
1024 | if (err || nullb->dev->curr_cache == 0) | |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1029 | spin_unlock_irq(&nullb->lock); | |
1030 | return err; | |
1031 | } | |
1032 | ||
5bcd0e0c | 1033 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1034 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1035 | bool is_fua) | |
f2298c04 | 1036 | { |
5bcd0e0c SL |
1037 | int err = 0; |
1038 | ||
1039 | if (!is_write) { | |
1040 | err = copy_from_nullb(nullb, page, off, sector, len); | |
1041 | flush_dcache_page(page); | |
1042 | } else { | |
1043 | flush_dcache_page(page); | |
deb78b41 | 1044 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1045 | } |
1046 | ||
1047 | return err; | |
1048 | } | |
1049 | ||
1050 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1051 | { | |
1052 | struct request *rq = cmd->rq; | |
1053 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1054 | int err; | |
1055 | unsigned int len; | |
1056 | sector_t sector; | |
1057 | struct req_iterator iter; | |
1058 | struct bio_vec bvec; | |
1059 | ||
1060 | sector = blk_rq_pos(rq); | |
1061 | ||
306eb6b4 SL |
1062 | if (req_op(rq) == REQ_OP_DISCARD) { |
1063 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1064 | return 0; | |
1065 | } | |
1066 | ||
5bcd0e0c SL |
1067 | spin_lock_irq(&nullb->lock); |
1068 | rq_for_each_segment(bvec, rq, iter) { | |
1069 | len = bvec.bv_len; | |
1070 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1071 | op_is_write(req_op(rq)), sector, |
1072 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1073 | if (err) { |
1074 | spin_unlock_irq(&nullb->lock); | |
1075 | return err; | |
1076 | } | |
1077 | sector += len >> SECTOR_SHIFT; | |
1078 | } | |
1079 | spin_unlock_irq(&nullb->lock); | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1085 | { | |
1086 | struct bio *bio = cmd->bio; | |
1087 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1088 | int err; | |
1089 | unsigned int len; | |
1090 | sector_t sector; | |
1091 | struct bio_vec bvec; | |
1092 | struct bvec_iter iter; | |
1093 | ||
1094 | sector = bio->bi_iter.bi_sector; | |
1095 | ||
306eb6b4 SL |
1096 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1097 | null_handle_discard(nullb, sector, | |
1098 | bio_sectors(bio) << SECTOR_SHIFT); | |
1099 | return 0; | |
1100 | } | |
1101 | ||
5bcd0e0c SL |
1102 | spin_lock_irq(&nullb->lock); |
1103 | bio_for_each_segment(bvec, bio, iter) { | |
1104 | len = bvec.bv_len; | |
1105 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1106 | op_is_write(bio_op(bio)), sector, |
bf7c7a04 | 1107 | bio->bi_opf & REQ_FUA); |
5bcd0e0c SL |
1108 | if (err) { |
1109 | spin_unlock_irq(&nullb->lock); | |
1110 | return err; | |
1111 | } | |
1112 | sector += len >> SECTOR_SHIFT; | |
1113 | } | |
1114 | spin_unlock_irq(&nullb->lock); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
eff2c4f1 SL |
1118 | static void null_stop_queue(struct nullb *nullb) |
1119 | { | |
1120 | struct request_queue *q = nullb->q; | |
1121 | ||
1122 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1123 | blk_mq_stop_hw_queues(q); | |
eff2c4f1 SL |
1124 | } |
1125 | ||
1126 | static void null_restart_queue_async(struct nullb *nullb) | |
1127 | { | |
1128 | struct request_queue *q = nullb->q; | |
eff2c4f1 SL |
1129 | |
1130 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1131 | blk_mq_start_stopped_hw_queues(q, true); | |
eff2c4f1 SL |
1132 | } |
1133 | ||
5bcd0e0c SL |
1134 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd) |
1135 | { | |
1136 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1137 | struct nullb *nullb = dev->nullb; |
5bcd0e0c SL |
1138 | int err = 0; |
1139 | ||
eff2c4f1 SL |
1140 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
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), | |
1147 | &nullb->cur_bytes) < 0) { | |
1148 | null_stop_queue(nullb); | |
1149 | /* race with timer */ | |
1150 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1151 | null_restart_queue_async(nullb); | |
e50b1e32 JA |
1152 | /* requeue request */ |
1153 | return BLK_STS_DEV_RESOURCE; | |
eff2c4f1 SL |
1154 | } |
1155 | } | |
1156 | ||
2f54a613 SL |
1157 | if (nullb->dev->badblocks.shift != -1) { |
1158 | int bad_sectors; | |
1159 | sector_t sector, size, first_bad; | |
1160 | bool is_flush = true; | |
1161 | ||
1162 | if (dev->queue_mode == NULL_Q_BIO && | |
1163 | bio_op(cmd->bio) != REQ_OP_FLUSH) { | |
1164 | is_flush = false; | |
1165 | sector = cmd->bio->bi_iter.bi_sector; | |
1166 | size = bio_sectors(cmd->bio); | |
1167 | } | |
1168 | if (dev->queue_mode != NULL_Q_BIO && | |
1169 | req_op(cmd->rq) != REQ_OP_FLUSH) { | |
1170 | is_flush = false; | |
1171 | sector = blk_rq_pos(cmd->rq); | |
1172 | size = blk_rq_sectors(cmd->rq); | |
1173 | } | |
1174 | if (!is_flush && badblocks_check(&nullb->dev->badblocks, sector, | |
1175 | size, &first_bad, &bad_sectors)) { | |
1176 | cmd->error = BLK_STS_IOERR; | |
1177 | goto out; | |
1178 | } | |
1179 | } | |
1180 | ||
5bcd0e0c | 1181 | if (dev->memory_backed) { |
deb78b41 SL |
1182 | if (dev->queue_mode == NULL_Q_BIO) { |
1183 | if (bio_op(cmd->bio) == REQ_OP_FLUSH) | |
1184 | err = null_handle_flush(nullb); | |
1185 | else | |
1186 | err = null_handle_bio(cmd); | |
1187 | } else { | |
1188 | if (req_op(cmd->rq) == REQ_OP_FLUSH) | |
1189 | err = null_handle_flush(nullb); | |
1190 | else | |
1191 | err = null_handle_rq(cmd); | |
1192 | } | |
5bcd0e0c SL |
1193 | } |
1194 | cmd->error = errno_to_blk_status(err); | |
ca4b2a01 MB |
1195 | |
1196 | if (!cmd->error && dev->zoned) { | |
b228ba1c JA |
1197 | sector_t sector; |
1198 | unsigned int nr_sectors; | |
1199 | int op; | |
1200 | ||
1201 | if (dev->queue_mode == NULL_Q_BIO) { | |
1202 | op = bio_op(cmd->bio); | |
1203 | sector = cmd->bio->bi_iter.bi_sector; | |
1204 | nr_sectors = cmd->bio->bi_iter.bi_size >> 9; | |
1205 | } else { | |
1206 | op = req_op(cmd->rq); | |
1207 | sector = blk_rq_pos(cmd->rq); | |
1208 | nr_sectors = blk_rq_sectors(cmd->rq); | |
1209 | } | |
1210 | ||
1211 | if (op == REQ_OP_WRITE) | |
1212 | null_zone_write(cmd, sector, nr_sectors); | |
1213 | else if (op == REQ_OP_ZONE_RESET) | |
1214 | null_zone_reset(cmd, sector); | |
ca4b2a01 | 1215 | } |
2f54a613 | 1216 | out: |
f2298c04 | 1217 | /* Complete IO by inline, softirq or timer */ |
5bcd0e0c | 1218 | switch (dev->irqmode) { |
f2298c04 | 1219 | case NULL_IRQ_SOFTIRQ: |
5bcd0e0c | 1220 | switch (dev->queue_mode) { |
ce2c350b | 1221 | case NULL_Q_MQ: |
08e0029a | 1222 | blk_mq_complete_request(cmd->rq); |
ce2c350b | 1223 | break; |
ce2c350b CH |
1224 | case NULL_Q_BIO: |
1225 | /* | |
1226 | * XXX: no proper submitting cpu information available. | |
1227 | */ | |
1228 | end_cmd(cmd); | |
1229 | break; | |
1230 | } | |
1231 | break; | |
1232 | case NULL_IRQ_NONE: | |
f2298c04 | 1233 | end_cmd(cmd); |
f2298c04 JA |
1234 | break; |
1235 | case NULL_IRQ_TIMER: | |
1236 | null_cmd_end_timer(cmd); | |
1237 | break; | |
1238 | } | |
5bcd0e0c | 1239 | return BLK_STS_OK; |
f2298c04 JA |
1240 | } |
1241 | ||
eff2c4f1 SL |
1242 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1243 | { | |
1244 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1245 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1246 | unsigned int mbps = nullb->dev->mbps; | |
1247 | ||
1248 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1249 | return HRTIMER_NORESTART; | |
1250 | ||
1251 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1252 | null_restart_queue_async(nullb); | |
1253 | ||
1254 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1255 | ||
1256 | return HRTIMER_RESTART; | |
1257 | } | |
1258 | ||
1259 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1260 | { | |
1261 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1262 | ||
1263 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1264 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1265 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1266 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1267 | } |
1268 | ||
1269 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1270 | { | |
1271 | int index = 0; | |
1272 | ||
1273 | if (nullb->nr_queues != 1) | |
1274 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1275 | ||
1276 | return &nullb->queues[index]; | |
1277 | } | |
1278 | ||
dece1635 | 1279 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
1280 | { |
1281 | struct nullb *nullb = q->queuedata; | |
1282 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1283 | struct nullb_cmd *cmd; | |
1284 | ||
1285 | cmd = alloc_cmd(nq, 1); | |
1286 | cmd->bio = bio; | |
1287 | ||
1288 | null_handle_cmd(cmd); | |
dece1635 | 1289 | return BLK_QC_T_NONE; |
f2298c04 JA |
1290 | } |
1291 | ||
93b57046 JA |
1292 | static bool should_timeout_request(struct request *rq) |
1293 | { | |
33f782c4 | 1294 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 JA |
1295 | if (g_timeout_str[0]) |
1296 | return should_fail(&null_timeout_attr, 1); | |
33f782c4 | 1297 | #endif |
24941b90 JA |
1298 | return false; |
1299 | } | |
93b57046 | 1300 | |
24941b90 JA |
1301 | static bool should_requeue_request(struct request *rq) |
1302 | { | |
1303 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1304 | if (g_requeue_str[0]) | |
1305 | return should_fail(&null_requeue_attr, 1); | |
1306 | #endif | |
93b57046 JA |
1307 | return false; |
1308 | } | |
1309 | ||
5448aca4 JA |
1310 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res) |
1311 | { | |
1312 | pr_info("null: rq %p timed out\n", rq); | |
0df0bb08 CH |
1313 | blk_mq_complete_request(rq); |
1314 | return BLK_EH_DONE; | |
5448aca4 JA |
1315 | } |
1316 | ||
fc17b653 | 1317 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1318 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1319 | { |
74c45052 | 1320 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1321 | struct nullb_queue *nq = hctx->driver_data; |
f2298c04 | 1322 | |
db5bcf87 JA |
1323 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1324 | ||
2984c868 | 1325 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1326 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1327 | cmd->timer.function = null_cmd_timer_expired; | |
1328 | } | |
74c45052 | 1329 | cmd->rq = bd->rq; |
2984c868 | 1330 | cmd->nq = nq; |
f2298c04 | 1331 | |
74c45052 | 1332 | blk_mq_start_request(bd->rq); |
e2490073 | 1333 | |
24941b90 JA |
1334 | if (should_requeue_request(bd->rq)) { |
1335 | /* | |
1336 | * Alternate between hitting the core BUSY path, and the | |
1337 | * driver driven requeue path | |
1338 | */ | |
1339 | nq->requeue_selection++; | |
1340 | if (nq->requeue_selection & 1) | |
1341 | return BLK_STS_RESOURCE; | |
1342 | else { | |
1343 | blk_mq_requeue_request(bd->rq, true); | |
1344 | return BLK_STS_OK; | |
1345 | } | |
1346 | } | |
1347 | if (should_timeout_request(bd->rq)) | |
1348 | return BLK_STS_OK; | |
93b57046 | 1349 | |
24941b90 | 1350 | return null_handle_cmd(cmd); |
f2298c04 JA |
1351 | } |
1352 | ||
f363b089 | 1353 | static const struct blk_mq_ops null_mq_ops = { |
f2298c04 | 1354 | .queue_rq = null_queue_rq, |
49f66136 | 1355 | .complete = null_complete_rq, |
5448aca4 | 1356 | .timeout = null_timeout_rq, |
f2298c04 JA |
1357 | }; |
1358 | ||
de65d2d2 MB |
1359 | static void cleanup_queue(struct nullb_queue *nq) |
1360 | { | |
1361 | kfree(nq->tag_map); | |
1362 | kfree(nq->cmds); | |
1363 | } | |
1364 | ||
1365 | static void cleanup_queues(struct nullb *nullb) | |
1366 | { | |
1367 | int i; | |
1368 | ||
1369 | for (i = 0; i < nullb->nr_queues; i++) | |
1370 | cleanup_queue(&nullb->queues[i]); | |
1371 | ||
1372 | kfree(nullb->queues); | |
1373 | } | |
1374 | ||
9ae2d0aa MB |
1375 | static void null_del_dev(struct nullb *nullb) |
1376 | { | |
2984c868 SL |
1377 | struct nullb_device *dev = nullb->dev; |
1378 | ||
94bc02e3 SL |
1379 | ida_simple_remove(&nullb_indexes, nullb->index); |
1380 | ||
9ae2d0aa MB |
1381 | list_del_init(&nullb->list); |
1382 | ||
74ede5af | 1383 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1384 | |
1385 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1386 | hrtimer_cancel(&nullb->bw_timer); | |
1387 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1388 | null_restart_queue_async(nullb); | |
1389 | } | |
1390 | ||
9ae2d0aa | 1391 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1392 | if (dev->queue_mode == NULL_Q_MQ && |
1393 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1394 | blk_mq_free_tag_set(nullb->tag_set); |
74ede5af | 1395 | put_disk(nullb->disk); |
9ae2d0aa | 1396 | cleanup_queues(nullb); |
deb78b41 SL |
1397 | if (null_cache_active(nullb)) |
1398 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1399 | kfree(nullb); |
2984c868 | 1400 | dev->nullb = NULL; |
9ae2d0aa MB |
1401 | } |
1402 | ||
306eb6b4 SL |
1403 | static void null_config_discard(struct nullb *nullb) |
1404 | { | |
1405 | if (nullb->dev->discard == false) | |
1406 | return; | |
1407 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1408 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1409 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
8b904b5b | 1410 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q); |
9ae2d0aa MB |
1411 | } |
1412 | ||
f2298c04 JA |
1413 | static int null_open(struct block_device *bdev, fmode_t mode) |
1414 | { | |
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | static void null_release(struct gendisk *disk, fmode_t mode) | |
1419 | { | |
1420 | } | |
1421 | ||
1422 | static const struct block_device_operations null_fops = { | |
1423 | .owner = THIS_MODULE, | |
1424 | .open = null_open, | |
1425 | .release = null_release, | |
e76239a3 | 1426 | .report_zones = null_zone_report, |
f2298c04 JA |
1427 | }; |
1428 | ||
82f402fe JA |
1429 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1430 | { | |
1431 | BUG_ON(!nullb); | |
1432 | BUG_ON(!nq); | |
1433 | ||
1434 | init_waitqueue_head(&nq->wait); | |
1435 | nq->queue_depth = nullb->queue_depth; | |
2984c868 | 1436 | nq->dev = nullb->dev; |
82f402fe JA |
1437 | } |
1438 | ||
1439 | static void null_init_queues(struct nullb *nullb) | |
1440 | { | |
1441 | struct request_queue *q = nullb->q; | |
1442 | struct blk_mq_hw_ctx *hctx; | |
1443 | struct nullb_queue *nq; | |
1444 | int i; | |
1445 | ||
1446 | queue_for_each_hw_ctx(q, hctx, i) { | |
1447 | if (!hctx->nr_ctx || !hctx->tags) | |
1448 | continue; | |
1449 | nq = &nullb->queues[i]; | |
1450 | hctx->driver_data = nq; | |
1451 | null_init_queue(nullb, nq); | |
1452 | nullb->nr_queues++; | |
1453 | } | |
1454 | } | |
1455 | ||
f2298c04 JA |
1456 | static int setup_commands(struct nullb_queue *nq) |
1457 | { | |
1458 | struct nullb_cmd *cmd; | |
1459 | int i, tag_size; | |
1460 | ||
6396bb22 | 1461 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
f2298c04 | 1462 | if (!nq->cmds) |
2d263a78 | 1463 | return -ENOMEM; |
f2298c04 JA |
1464 | |
1465 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
6396bb22 | 1466 | nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL); |
f2298c04 JA |
1467 | if (!nq->tag_map) { |
1468 | kfree(nq->cmds); | |
2d263a78 | 1469 | return -ENOMEM; |
f2298c04 JA |
1470 | } |
1471 | ||
1472 | for (i = 0; i < nq->queue_depth; i++) { | |
1473 | cmd = &nq->cmds[i]; | |
1474 | INIT_LIST_HEAD(&cmd->list); | |
1475 | cmd->ll_list.next = NULL; | |
1476 | cmd->tag = -1U; | |
1477 | } | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
f2298c04 JA |
1482 | static int setup_queues(struct nullb *nullb) |
1483 | { | |
6396bb22 KC |
1484 | nullb->queues = kcalloc(nullb->dev->submit_queues, |
1485 | sizeof(struct nullb_queue), | |
1486 | GFP_KERNEL); | |
f2298c04 | 1487 | if (!nullb->queues) |
2d263a78 | 1488 | return -ENOMEM; |
f2298c04 JA |
1489 | |
1490 | nullb->nr_queues = 0; | |
2984c868 | 1491 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1492 | |
2d263a78 MB |
1493 | return 0; |
1494 | } | |
1495 | ||
1496 | static int init_driver_queues(struct nullb *nullb) | |
1497 | { | |
1498 | struct nullb_queue *nq; | |
1499 | int i, ret = 0; | |
f2298c04 | 1500 | |
2984c868 | 1501 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1502 | nq = &nullb->queues[i]; |
2d263a78 MB |
1503 | |
1504 | null_init_queue(nullb, nq); | |
1505 | ||
1506 | ret = setup_commands(nq); | |
1507 | if (ret) | |
31f9690e | 1508 | return ret; |
f2298c04 JA |
1509 | nullb->nr_queues++; |
1510 | } | |
2d263a78 | 1511 | return 0; |
f2298c04 JA |
1512 | } |
1513 | ||
9ae2d0aa | 1514 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
1515 | { |
1516 | struct gendisk *disk; | |
f2298c04 | 1517 | sector_t size; |
9ae2d0aa | 1518 | |
2984c868 | 1519 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1520 | if (!disk) |
1521 | return -ENOMEM; | |
2984c868 | 1522 | size = (sector_t)nullb->dev->size * 1024 * 1024ULL; |
9ae2d0aa MB |
1523 | set_capacity(disk, size >> 9); |
1524 | ||
1525 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1526 | disk->major = null_major; | |
1527 | disk->first_minor = nullb->index; | |
1528 | disk->fops = &null_fops; | |
1529 | disk->private_data = nullb; | |
1530 | disk->queue = nullb->q; | |
1531 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1532 | ||
bf505456 DLM |
1533 | if (nullb->dev->zoned) { |
1534 | int ret = blk_revalidate_disk_zones(disk); | |
1535 | ||
1536 | if (ret != 0) | |
1537 | return ret; | |
1538 | } | |
1539 | ||
9ae2d0aa MB |
1540 | add_disk(disk); |
1541 | return 0; | |
1542 | } | |
1543 | ||
2984c868 | 1544 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1545 | { |
1546 | set->ops = &null_mq_ops; | |
2984c868 SL |
1547 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1548 | g_submit_queues; | |
1549 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1550 | g_hw_queue_depth; | |
1551 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1552 | set->cmd_size = sizeof(struct nullb_cmd); |
1553 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1554 | if (g_no_sched) |
1555 | set->flags |= BLK_MQ_F_NO_SCHED; | |
82f402fe JA |
1556 | set->driver_data = NULL; |
1557 | ||
0d06a42f | 1558 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1559 | set->flags |= BLK_MQ_F_BLOCKING; |
1560 | ||
1561 | return blk_mq_alloc_tag_set(set); | |
1562 | } | |
1563 | ||
cedcafad SL |
1564 | static void null_validate_conf(struct nullb_device *dev) |
1565 | { | |
1566 | dev->blocksize = round_down(dev->blocksize, 512); | |
1567 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad SL |
1568 | |
1569 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1570 | if (dev->submit_queues != nr_online_nodes) | |
1571 | dev->submit_queues = nr_online_nodes; | |
1572 | } else if (dev->submit_queues > nr_cpu_ids) | |
1573 | dev->submit_queues = nr_cpu_ids; | |
1574 | else if (dev->submit_queues == 0) | |
1575 | dev->submit_queues = 1; | |
1576 | ||
1577 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1578 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1579 | |
1580 | /* Do memory allocation, so set blocking */ | |
1581 | if (dev->memory_backed) | |
1582 | dev->blocking = true; | |
deb78b41 SL |
1583 | else /* cache is meaningless */ |
1584 | dev->cache_size = 0; | |
1585 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1586 | dev->cache_size); | |
eff2c4f1 SL |
1587 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1588 | /* can not stop a queue */ | |
1589 | if (dev->queue_mode == NULL_Q_BIO) | |
1590 | dev->mbps = 0; | |
cedcafad SL |
1591 | } |
1592 | ||
33f782c4 | 1593 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1594 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1595 | { | |
1596 | if (!str[0]) | |
93b57046 JA |
1597 | return true; |
1598 | ||
24941b90 | 1599 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1600 | return false; |
1601 | ||
24941b90 JA |
1602 | attr->verbose = 0; |
1603 | return true; | |
1604 | } | |
1605 | #endif | |
1606 | ||
1607 | static bool null_setup_fault(void) | |
1608 | { | |
1609 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1610 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1611 | return false; | |
1612 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1613 | return false; | |
33f782c4 | 1614 | #endif |
93b57046 JA |
1615 | return true; |
1616 | } | |
1617 | ||
2984c868 | 1618 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1619 | { |
1620 | struct nullb *nullb; | |
dc501dc0 | 1621 | int rv; |
f2298c04 | 1622 | |
cedcafad SL |
1623 | null_validate_conf(dev); |
1624 | ||
2984c868 | 1625 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1626 | if (!nullb) { |
1627 | rv = -ENOMEM; | |
24d2f903 | 1628 | goto out; |
dc501dc0 | 1629 | } |
2984c868 SL |
1630 | nullb->dev = dev; |
1631 | dev->nullb = nullb; | |
f2298c04 JA |
1632 | |
1633 | spin_lock_init(&nullb->lock); | |
1634 | ||
dc501dc0 RE |
1635 | rv = setup_queues(nullb); |
1636 | if (rv) | |
24d2f903 | 1637 | goto out_free_nullb; |
f2298c04 | 1638 | |
2984c868 | 1639 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1640 | if (shared_tags) { |
1641 | nullb->tag_set = &tag_set; | |
1642 | rv = 0; | |
1643 | } else { | |
1644 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1645 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1646 | } |
1647 | ||
dc501dc0 | 1648 | if (rv) |
24d2f903 CH |
1649 | goto out_cleanup_queues; |
1650 | ||
93b57046 JA |
1651 | if (!null_setup_fault()) |
1652 | goto out_cleanup_queues; | |
1653 | ||
5448aca4 | 1654 | nullb->tag_set->timeout = 5 * HZ; |
82f402fe | 1655 | nullb->q = blk_mq_init_queue(nullb->tag_set); |
35b489d3 | 1656 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1657 | rv = -ENOMEM; |
24d2f903 | 1658 | goto out_cleanup_tags; |
dc501dc0 | 1659 | } |
82f402fe | 1660 | null_init_queues(nullb); |
2984c868 | 1661 | } else if (dev->queue_mode == NULL_Q_BIO) { |
6d469642 | 1662 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1663 | if (!nullb->q) { |
1664 | rv = -ENOMEM; | |
24d2f903 | 1665 | goto out_cleanup_queues; |
dc501dc0 | 1666 | } |
f2298c04 | 1667 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1668 | rv = init_driver_queues(nullb); |
1669 | if (rv) | |
1670 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1671 | } |
1672 | ||
eff2c4f1 SL |
1673 | if (dev->mbps) { |
1674 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1675 | nullb_setup_bwtimer(nullb); | |
1676 | } | |
1677 | ||
deb78b41 SL |
1678 | if (dev->cache_size > 0) { |
1679 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1680 | blk_queue_write_cache(nullb->q, true, true); | |
deb78b41 SL |
1681 | } |
1682 | ||
ca4b2a01 MB |
1683 | if (dev->zoned) { |
1684 | rv = null_zone_init(dev); | |
1685 | if (rv) | |
1686 | goto out_cleanup_blk_queue; | |
1687 | ||
1688 | blk_queue_chunk_sectors(nullb->q, dev->zone_size_sects); | |
1689 | nullb->q->limits.zoned = BLK_ZONED_HM; | |
1690 | } | |
1691 | ||
f2298c04 | 1692 | nullb->q->queuedata = nullb; |
8b904b5b BVA |
1693 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
1694 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); | |
f2298c04 | 1695 | |
f2298c04 | 1696 | mutex_lock(&lock); |
94bc02e3 | 1697 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1698 | dev->index = nullb->index; |
f2298c04 JA |
1699 | mutex_unlock(&lock); |
1700 | ||
2984c868 SL |
1701 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1702 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1703 | |
306eb6b4 | 1704 | null_config_discard(nullb); |
f2298c04 | 1705 | |
b2b7e001 MB |
1706 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1707 | ||
74ede5af | 1708 | rv = null_gendisk_register(nullb); |
9ae2d0aa | 1709 | if (rv) |
ca4b2a01 | 1710 | goto out_cleanup_zone; |
a514379b MB |
1711 | |
1712 | mutex_lock(&lock); | |
1713 | list_add_tail(&nullb->list, &nullb_list); | |
1714 | mutex_unlock(&lock); | |
3681c85d | 1715 | |
f2298c04 | 1716 | return 0; |
ca4b2a01 MB |
1717 | out_cleanup_zone: |
1718 | if (dev->zoned) | |
1719 | null_zone_exit(dev); | |
24d2f903 CH |
1720 | out_cleanup_blk_queue: |
1721 | blk_cleanup_queue(nullb->q); | |
1722 | out_cleanup_tags: | |
2984c868 | 1723 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1724 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1725 | out_cleanup_queues: |
1726 | cleanup_queues(nullb); | |
1727 | out_free_nullb: | |
1728 | kfree(nullb); | |
1729 | out: | |
dc501dc0 | 1730 | return rv; |
f2298c04 JA |
1731 | } |
1732 | ||
1733 | static int __init null_init(void) | |
1734 | { | |
af096e22 | 1735 | int ret = 0; |
f2298c04 | 1736 | unsigned int i; |
af096e22 | 1737 | struct nullb *nullb; |
2984c868 | 1738 | struct nullb_device *dev; |
f2298c04 | 1739 | |
2984c868 | 1740 | if (g_bs > PAGE_SIZE) { |
9967d8ac R |
1741 | pr_warn("null_blk: invalid block size\n"); |
1742 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1743 | g_bs = PAGE_SIZE; |
9967d8ac | 1744 | } |
f2298c04 | 1745 | |
ca4b2a01 MB |
1746 | if (!is_power_of_2(g_zone_size)) { |
1747 | pr_err("null_blk: zone_size must be power-of-two\n"); | |
1748 | return -EINVAL; | |
1749 | } | |
1750 | ||
e50b1e32 JA |
1751 | if (g_queue_mode == NULL_Q_RQ) { |
1752 | pr_err("null_blk: legacy IO path no longer available\n"); | |
1753 | return -EINVAL; | |
1754 | } | |
2984c868 SL |
1755 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1756 | if (g_submit_queues != nr_online_nodes) { | |
558ab300 | 1757 | pr_warn("null_blk: submit_queues param is set to %u.\n", |
d15ee6b1 | 1758 | nr_online_nodes); |
2984c868 | 1759 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1760 | } |
2984c868 SL |
1761 | } else if (g_submit_queues > nr_cpu_ids) |
1762 | g_submit_queues = nr_cpu_ids; | |
1763 | else if (g_submit_queues <= 0) | |
1764 | g_submit_queues = 1; | |
f2298c04 | 1765 | |
2984c868 SL |
1766 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1767 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1768 | if (ret) |
1769 | return ret; | |
1770 | } | |
1771 | ||
3bf2bd20 SL |
1772 | config_group_init(&nullb_subsys.su_group); |
1773 | mutex_init(&nullb_subsys.su_mutex); | |
1774 | ||
1775 | ret = configfs_register_subsystem(&nullb_subsys); | |
1776 | if (ret) | |
1777 | goto err_tagset; | |
1778 | ||
f2298c04 JA |
1779 | mutex_init(&lock); |
1780 | ||
f2298c04 | 1781 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1782 | if (null_major < 0) { |
1783 | ret = null_major; | |
3bf2bd20 | 1784 | goto err_conf; |
db2d153d | 1785 | } |
f2298c04 JA |
1786 | |
1787 | for (i = 0; i < nr_devices; i++) { | |
2984c868 | 1788 | dev = null_alloc_dev(); |
30c516d7 WY |
1789 | if (!dev) { |
1790 | ret = -ENOMEM; | |
2984c868 | 1791 | goto err_dev; |
30c516d7 | 1792 | } |
2984c868 SL |
1793 | ret = null_add_dev(dev); |
1794 | if (ret) { | |
1795 | null_free_dev(dev); | |
af096e22 | 1796 | goto err_dev; |
2984c868 | 1797 | } |
f2298c04 JA |
1798 | } |
1799 | ||
1800 | pr_info("null: module loaded\n"); | |
1801 | return 0; | |
af096e22 MH |
1802 | |
1803 | err_dev: | |
1804 | while (!list_empty(&nullb_list)) { | |
1805 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 1806 | dev = nullb->dev; |
af096e22 | 1807 | null_del_dev(nullb); |
2984c868 | 1808 | null_free_dev(dev); |
af096e22 | 1809 | } |
af096e22 | 1810 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
1811 | err_conf: |
1812 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 1813 | err_tagset: |
2984c868 | 1814 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 1815 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 1816 | return ret; |
f2298c04 JA |
1817 | } |
1818 | ||
1819 | static void __exit null_exit(void) | |
1820 | { | |
1821 | struct nullb *nullb; | |
1822 | ||
3bf2bd20 SL |
1823 | configfs_unregister_subsystem(&nullb_subsys); |
1824 | ||
f2298c04 JA |
1825 | unregister_blkdev(null_major, "nullb"); |
1826 | ||
1827 | mutex_lock(&lock); | |
1828 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
1829 | struct nullb_device *dev; |
1830 | ||
f2298c04 | 1831 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 1832 | dev = nullb->dev; |
f2298c04 | 1833 | null_del_dev(nullb); |
2984c868 | 1834 | null_free_dev(dev); |
f2298c04 JA |
1835 | } |
1836 | mutex_unlock(&lock); | |
6bb9535b | 1837 | |
2984c868 | 1838 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe | 1839 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
1840 | } |
1841 | ||
1842 | module_init(null_init); | |
1843 | module_exit(null_exit); | |
1844 | ||
231b3db1 | 1845 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 1846 | MODULE_LICENSE("GPL"); |