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 FREE_BATCH 16 |
15 | ||
eff2c4f1 SL |
16 | #define TICKS_PER_SEC 50ULL |
17 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
18 | ||
33f782c4 | 19 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 20 | static DECLARE_FAULT_ATTR(null_timeout_attr); |
24941b90 | 21 | static DECLARE_FAULT_ATTR(null_requeue_attr); |
596444e7 | 22 | static DECLARE_FAULT_ATTR(null_init_hctx_attr); |
33f782c4 | 23 | #endif |
93b57046 | 24 | |
eff2c4f1 SL |
25 | static inline u64 mb_per_tick(int mbps) |
26 | { | |
27 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
28 | } | |
f2298c04 | 29 | |
3bf2bd20 SL |
30 | /* |
31 | * Status flags for nullb_device. | |
32 | * | |
33 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
34 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 35 | * THROTTLED: Device is being throttled. |
deb78b41 | 36 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
37 | */ |
38 | enum nullb_device_flags { | |
39 | NULLB_DEV_FL_CONFIGURED = 0, | |
40 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 41 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 42 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
43 | }; |
44 | ||
66231ad3 | 45 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
46 | /* |
47 | * nullb_page is a page in memory for nullb devices. | |
48 | * | |
49 | * @page: The page holding the data. | |
50 | * @bitmap: The bitmap represents which sector in the page has data. | |
51 | * Each bit represents one block size. For example, sector 8 | |
52 | * will use the 7th bit | |
deb78b41 SL |
53 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
54 | * page is being flushing to storage. FREE means the cache page is freed and | |
55 | * should be skipped from flushing to storage. Please see | |
56 | * null_make_cache_space | |
5bcd0e0c SL |
57 | */ |
58 | struct nullb_page { | |
59 | struct page *page; | |
66231ad3 | 60 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 61 | }; |
66231ad3 ML |
62 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
63 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 64 | |
f2298c04 JA |
65 | static LIST_HEAD(nullb_list); |
66 | static struct mutex lock; | |
67 | static int null_major; | |
94bc02e3 | 68 | static DEFINE_IDA(nullb_indexes); |
82f402fe | 69 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 70 | |
f2298c04 JA |
71 | enum { |
72 | NULL_IRQ_NONE = 0, | |
73 | NULL_IRQ_SOFTIRQ = 1, | |
74 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 75 | }; |
f2298c04 | 76 | |
ce2c350b | 77 | enum { |
f2298c04 JA |
78 | NULL_Q_BIO = 0, |
79 | NULL_Q_RQ = 1, | |
80 | NULL_Q_MQ = 2, | |
81 | }; | |
82 | ||
cee1b215 MG |
83 | static bool g_virt_boundary = false; |
84 | module_param_named(virt_boundary, g_virt_boundary, bool, 0444); | |
85 | MODULE_PARM_DESC(virt_boundary, "Require a virtual boundary for the device. Default: False"); | |
86 | ||
b3cffc38 | 87 | static int g_no_sched; |
5657a819 | 88 | module_param_named(no_sched, g_no_sched, int, 0444); |
b3cffc38 | 89 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
90 | ||
2984c868 | 91 | static int g_submit_queues = 1; |
5657a819 | 92 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
f2298c04 JA |
93 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
94 | ||
2984c868 | 95 | static int g_home_node = NUMA_NO_NODE; |
5657a819 | 96 | module_param_named(home_node, g_home_node, int, 0444); |
f2298c04 JA |
97 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
98 | ||
33f782c4 | 99 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
290df92a DZ |
100 | /* |
101 | * For more details about fault injection, please refer to | |
102 | * Documentation/fault-injection/fault-injection.rst. | |
103 | */ | |
93b57046 | 104 | static char g_timeout_str[80]; |
5657a819 | 105 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
290df92a | 106 | MODULE_PARM_DESC(timeout, "Fault injection. timeout=<interval>,<probability>,<space>,<times>"); |
24941b90 JA |
107 | |
108 | static char g_requeue_str[80]; | |
5657a819 | 109 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
290df92a | 110 | MODULE_PARM_DESC(requeue, "Fault injection. requeue=<interval>,<probability>,<space>,<times>"); |
596444e7 BVA |
111 | |
112 | static char g_init_hctx_str[80]; | |
113 | module_param_string(init_hctx, g_init_hctx_str, sizeof(g_init_hctx_str), 0444); | |
290df92a | 114 | MODULE_PARM_DESC(init_hctx, "Fault injection to fail hctx init. init_hctx=<interval>,<probability>,<space>,<times>"); |
33f782c4 | 115 | #endif |
93b57046 | 116 | |
2984c868 | 117 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
118 | |
119 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
120 | { | |
121 | int ret, new_val; | |
122 | ||
123 | ret = kstrtoint(str, 10, &new_val); | |
124 | if (ret) | |
125 | return -EINVAL; | |
126 | ||
127 | if (new_val < min || new_val > max) | |
128 | return -EINVAL; | |
129 | ||
130 | *val = new_val; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
135 | { | |
2984c868 | 136 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
137 | } |
138 | ||
9c27847d | 139 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
140 | .set = null_set_queue_mode, |
141 | .get = param_get_int, | |
142 | }; | |
143 | ||
5657a819 | 144 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
54ae81cd | 145 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 146 | |
2984c868 | 147 | static int g_gb = 250; |
5657a819 | 148 | module_param_named(gb, g_gb, int, 0444); |
f2298c04 JA |
149 | MODULE_PARM_DESC(gb, "Size in GB"); |
150 | ||
2984c868 | 151 | static int g_bs = 512; |
5657a819 | 152 | module_param_named(bs, g_bs, int, 0444); |
f2298c04 JA |
153 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
154 | ||
ea17fd35 DLM |
155 | static int g_max_sectors; |
156 | module_param_named(max_sectors, g_max_sectors, int, 0444); | |
157 | MODULE_PARM_DESC(max_sectors, "Maximum size of a command (in 512B sectors)"); | |
158 | ||
f7c4ce89 | 159 | static unsigned int nr_devices = 1; |
701dfc42 | 160 | module_param(nr_devices, uint, 0444); |
f2298c04 JA |
161 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
162 | ||
2984c868 | 163 | static bool g_blocking; |
5657a819 | 164 | module_param_named(blocking, g_blocking, bool, 0444); |
db5bcf87 JA |
165 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
166 | ||
82f402fe | 167 | static bool shared_tags; |
5657a819 | 168 | module_param(shared_tags, bool, 0444); |
82f402fe JA |
169 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
170 | ||
0905053b JG |
171 | static bool g_shared_tag_bitmap; |
172 | module_param_named(shared_tag_bitmap, g_shared_tag_bitmap, bool, 0444); | |
173 | MODULE_PARM_DESC(shared_tag_bitmap, "Use shared tag bitmap for all submission queues for blk-mq"); | |
174 | ||
2984c868 | 175 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
176 | |
177 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
178 | { | |
2984c868 | 179 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
180 | NULL_IRQ_TIMER); |
181 | } | |
182 | ||
9c27847d | 183 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
184 | .set = null_set_irqmode, |
185 | .get = param_get_int, | |
186 | }; | |
187 | ||
5657a819 | 188 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
f2298c04 JA |
189 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
190 | ||
2984c868 | 191 | static unsigned long g_completion_nsec = 10000; |
5657a819 | 192 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
f2298c04 JA |
193 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
194 | ||
2984c868 | 195 | static int g_hw_queue_depth = 64; |
5657a819 | 196 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
f2298c04 JA |
197 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
198 | ||
2984c868 | 199 | static bool g_use_per_node_hctx; |
5657a819 | 200 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
20005244 | 201 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 202 | |
ca4b2a01 MB |
203 | static bool g_zoned; |
204 | module_param_named(zoned, g_zoned, bool, S_IRUGO); | |
205 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); | |
206 | ||
207 | static unsigned long g_zone_size = 256; | |
208 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); | |
209 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); | |
210 | ||
089565fb AR |
211 | static unsigned long g_zone_capacity; |
212 | module_param_named(zone_capacity, g_zone_capacity, ulong, 0444); | |
213 | MODULE_PARM_DESC(zone_capacity, "Zone capacity in MB when block device is zoned. Can be less than or equal to zone size. Default: Zone size"); | |
214 | ||
ea2c18e1 MS |
215 | static unsigned int g_zone_nr_conv; |
216 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); | |
217 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); | |
218 | ||
dc4d137e NC |
219 | static unsigned int g_zone_max_open; |
220 | module_param_named(zone_max_open, g_zone_max_open, uint, 0444); | |
221 | MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones when block device is zoned. Default: 0 (no limit)"); | |
222 | ||
223 | static unsigned int g_zone_max_active; | |
224 | module_param_named(zone_max_active, g_zone_max_active, uint, 0444); | |
225 | MODULE_PARM_DESC(zone_max_active, "Maximum number of active zones when block device is zoned. Default: 0 (no limit)"); | |
226 | ||
3bf2bd20 SL |
227 | static struct nullb_device *null_alloc_dev(void); |
228 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
229 | static void null_del_dev(struct nullb *nullb); |
230 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 231 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
232 | |
233 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
234 | { | |
235 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
236 | } | |
237 | ||
238 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
239 | { | |
240 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
241 | } | |
242 | ||
243 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
244 | char *page) | |
245 | { | |
246 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
247 | } | |
248 | ||
249 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
250 | { | |
251 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
252 | } | |
253 | ||
254 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
255 | const char *page, size_t count) | |
256 | { | |
257 | unsigned int tmp; | |
258 | int result; | |
259 | ||
260 | result = kstrtouint(page, 0, &tmp); | |
45919fbf | 261 | if (result < 0) |
3bf2bd20 SL |
262 | return result; |
263 | ||
264 | *val = tmp; | |
265 | return count; | |
266 | } | |
267 | ||
268 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
269 | const char *page, size_t count) | |
270 | { | |
271 | int result; | |
272 | unsigned long tmp; | |
273 | ||
274 | result = kstrtoul(page, 0, &tmp); | |
45919fbf | 275 | if (result < 0) |
3bf2bd20 SL |
276 | return result; |
277 | ||
278 | *val = tmp; | |
279 | return count; | |
280 | } | |
281 | ||
282 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
283 | size_t count) | |
284 | { | |
285 | bool tmp; | |
286 | int result; | |
287 | ||
288 | result = kstrtobool(page, &tmp); | |
45919fbf | 289 | if (result < 0) |
3bf2bd20 SL |
290 | return result; |
291 | ||
292 | *val = tmp; | |
293 | return count; | |
294 | } | |
295 | ||
296 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
ca0a95a6 AM |
297 | #define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \ |
298 | static ssize_t \ | |
299 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
300 | { \ | |
301 | return nullb_device_##TYPE##_attr_show( \ | |
302 | to_nullb_device(item)->NAME, page); \ | |
303 | } \ | |
304 | static ssize_t \ | |
305 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
306 | size_t count) \ | |
307 | { \ | |
308 | int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ | |
309 | struct nullb_device *dev = to_nullb_device(item); \ | |
b9853b4d | 310 | TYPE new_value = 0; \ |
ca0a95a6 AM |
311 | int ret; \ |
312 | \ | |
313 | ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ | |
314 | if (ret < 0) \ | |
315 | return ret; \ | |
316 | if (apply_fn) \ | |
317 | ret = apply_fn(dev, new_value); \ | |
318 | else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \ | |
319 | ret = -EBUSY; \ | |
320 | if (ret < 0) \ | |
321 | return ret; \ | |
322 | dev->NAME = new_value; \ | |
323 | return count; \ | |
324 | } \ | |
3bf2bd20 SL |
325 | CONFIGFS_ATTR(nullb_device_, NAME); |
326 | ||
45919fbf BVA |
327 | static int nullb_apply_submit_queues(struct nullb_device *dev, |
328 | unsigned int submit_queues) | |
329 | { | |
330 | struct nullb *nullb = dev->nullb; | |
331 | struct blk_mq_tag_set *set; | |
332 | ||
333 | if (!nullb) | |
334 | return 0; | |
335 | ||
78b10be2 BVA |
336 | /* |
337 | * Make sure that null_init_hctx() does not access nullb->queues[] past | |
338 | * the end of that array. | |
339 | */ | |
340 | if (submit_queues > nr_cpu_ids) | |
341 | return -EINVAL; | |
45919fbf BVA |
342 | set = nullb->tag_set; |
343 | blk_mq_update_nr_hw_queues(set, submit_queues); | |
344 | return set->nr_hw_queues == submit_queues ? 0 : -ENOMEM; | |
345 | } | |
346 | ||
347 | NULLB_DEVICE_ATTR(size, ulong, NULL); | |
348 | NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL); | |
349 | NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues); | |
350 | NULLB_DEVICE_ATTR(home_node, uint, NULL); | |
351 | NULLB_DEVICE_ATTR(queue_mode, uint, NULL); | |
352 | NULLB_DEVICE_ATTR(blocksize, uint, NULL); | |
ea17fd35 | 353 | NULLB_DEVICE_ATTR(max_sectors, uint, NULL); |
45919fbf BVA |
354 | NULLB_DEVICE_ATTR(irqmode, uint, NULL); |
355 | NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); | |
356 | NULLB_DEVICE_ATTR(index, uint, NULL); | |
357 | NULLB_DEVICE_ATTR(blocking, bool, NULL); | |
358 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL); | |
359 | NULLB_DEVICE_ATTR(memory_backed, bool, NULL); | |
360 | NULLB_DEVICE_ATTR(discard, bool, NULL); | |
361 | NULLB_DEVICE_ATTR(mbps, uint, NULL); | |
362 | NULLB_DEVICE_ATTR(cache_size, ulong, NULL); | |
363 | NULLB_DEVICE_ATTR(zoned, bool, NULL); | |
364 | NULLB_DEVICE_ATTR(zone_size, ulong, NULL); | |
089565fb | 365 | NULLB_DEVICE_ATTR(zone_capacity, ulong, NULL); |
45919fbf | 366 | NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL); |
dc4d137e NC |
367 | NULLB_DEVICE_ATTR(zone_max_open, uint, NULL); |
368 | NULLB_DEVICE_ATTR(zone_max_active, uint, NULL); | |
cee1b215 | 369 | NULLB_DEVICE_ATTR(virt_boundary, bool, NULL); |
3bf2bd20 | 370 | |
cedcafad SL |
371 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
372 | { | |
373 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
374 | } | |
375 | ||
376 | static ssize_t nullb_device_power_store(struct config_item *item, | |
377 | const char *page, size_t count) | |
378 | { | |
379 | struct nullb_device *dev = to_nullb_device(item); | |
380 | bool newp = false; | |
381 | ssize_t ret; | |
382 | ||
383 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
384 | if (ret < 0) | |
385 | return ret; | |
386 | ||
387 | if (!dev->power && newp) { | |
388 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
389 | return count; | |
390 | if (null_add_dev(dev)) { | |
391 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
392 | return -ENOMEM; | |
393 | } | |
394 | ||
395 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
396 | dev->power = newp; | |
b3c30512 | 397 | } else if (dev->power && !newp) { |
7602843f BL |
398 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
399 | mutex_lock(&lock); | |
400 | dev->power = newp; | |
401 | null_del_dev(dev->nullb); | |
402 | mutex_unlock(&lock); | |
403 | } | |
00a8cdb8 | 404 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
405 | } |
406 | ||
407 | return count; | |
408 | } | |
409 | ||
410 | CONFIGFS_ATTR(nullb_device_, power); | |
411 | ||
2f54a613 SL |
412 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
413 | { | |
414 | struct nullb_device *t_dev = to_nullb_device(item); | |
415 | ||
416 | return badblocks_show(&t_dev->badblocks, page, 0); | |
417 | } | |
418 | ||
419 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
420 | const char *page, size_t count) | |
421 | { | |
422 | struct nullb_device *t_dev = to_nullb_device(item); | |
423 | char *orig, *buf, *tmp; | |
424 | u64 start, end; | |
425 | int ret; | |
426 | ||
427 | orig = kstrndup(page, count, GFP_KERNEL); | |
428 | if (!orig) | |
429 | return -ENOMEM; | |
430 | ||
431 | buf = strstrip(orig); | |
432 | ||
433 | ret = -EINVAL; | |
434 | if (buf[0] != '+' && buf[0] != '-') | |
435 | goto out; | |
436 | tmp = strchr(&buf[1], '-'); | |
437 | if (!tmp) | |
438 | goto out; | |
439 | *tmp = '\0'; | |
440 | ret = kstrtoull(buf + 1, 0, &start); | |
441 | if (ret) | |
442 | goto out; | |
443 | ret = kstrtoull(tmp + 1, 0, &end); | |
444 | if (ret) | |
445 | goto out; | |
446 | ret = -EINVAL; | |
447 | if (start > end) | |
448 | goto out; | |
449 | /* enable badblocks */ | |
450 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
451 | if (buf[0] == '+') | |
452 | ret = badblocks_set(&t_dev->badblocks, start, | |
453 | end - start + 1, 1); | |
454 | else | |
455 | ret = badblocks_clear(&t_dev->badblocks, start, | |
456 | end - start + 1); | |
457 | if (ret == 0) | |
458 | ret = count; | |
459 | out: | |
460 | kfree(orig); | |
461 | return ret; | |
462 | } | |
463 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
464 | ||
3bf2bd20 SL |
465 | static struct configfs_attribute *nullb_device_attrs[] = { |
466 | &nullb_device_attr_size, | |
467 | &nullb_device_attr_completion_nsec, | |
468 | &nullb_device_attr_submit_queues, | |
469 | &nullb_device_attr_home_node, | |
470 | &nullb_device_attr_queue_mode, | |
471 | &nullb_device_attr_blocksize, | |
ea17fd35 | 472 | &nullb_device_attr_max_sectors, |
3bf2bd20 SL |
473 | &nullb_device_attr_irqmode, |
474 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 475 | &nullb_device_attr_index, |
3bf2bd20 SL |
476 | &nullb_device_attr_blocking, |
477 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 478 | &nullb_device_attr_power, |
5bcd0e0c | 479 | &nullb_device_attr_memory_backed, |
306eb6b4 | 480 | &nullb_device_attr_discard, |
eff2c4f1 | 481 | &nullb_device_attr_mbps, |
deb78b41 | 482 | &nullb_device_attr_cache_size, |
2f54a613 | 483 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
484 | &nullb_device_attr_zoned, |
485 | &nullb_device_attr_zone_size, | |
089565fb | 486 | &nullb_device_attr_zone_capacity, |
ea2c18e1 | 487 | &nullb_device_attr_zone_nr_conv, |
dc4d137e NC |
488 | &nullb_device_attr_zone_max_open, |
489 | &nullb_device_attr_zone_max_active, | |
cee1b215 | 490 | &nullb_device_attr_virt_boundary, |
3bf2bd20 SL |
491 | NULL, |
492 | }; | |
493 | ||
494 | static void nullb_device_release(struct config_item *item) | |
495 | { | |
5bcd0e0c SL |
496 | struct nullb_device *dev = to_nullb_device(item); |
497 | ||
deb78b41 | 498 | null_free_device_storage(dev, false); |
5bcd0e0c | 499 | null_free_dev(dev); |
3bf2bd20 SL |
500 | } |
501 | ||
502 | static struct configfs_item_operations nullb_device_ops = { | |
503 | .release = nullb_device_release, | |
504 | }; | |
505 | ||
e1919dff | 506 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
507 | .ct_item_ops = &nullb_device_ops, |
508 | .ct_attrs = nullb_device_attrs, | |
509 | .ct_owner = THIS_MODULE, | |
510 | }; | |
511 | ||
512 | static struct | |
513 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
514 | { | |
515 | struct nullb_device *dev; | |
516 | ||
517 | dev = null_alloc_dev(); | |
518 | if (!dev) | |
519 | return ERR_PTR(-ENOMEM); | |
520 | ||
521 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
522 | ||
523 | return &dev->item; | |
524 | } | |
525 | ||
526 | static void | |
527 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
528 | { | |
cedcafad SL |
529 | struct nullb_device *dev = to_nullb_device(item); |
530 | ||
531 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
532 | mutex_lock(&lock); | |
533 | dev->power = false; | |
534 | null_del_dev(dev->nullb); | |
535 | mutex_unlock(&lock); | |
536 | } | |
537 | ||
3bf2bd20 SL |
538 | config_item_put(item); |
539 | } | |
540 | ||
541 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
542 | { | |
089565fb | 543 | return snprintf(page, PAGE_SIZE, |
cee1b215 | 544 | "memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size,zone_capacity,zone_nr_conv,zone_max_open,zone_max_active,blocksize,max_sectors,virt_boundary\n"); |
3bf2bd20 SL |
545 | } |
546 | ||
547 | CONFIGFS_ATTR_RO(memb_group_, features); | |
548 | ||
549 | static struct configfs_attribute *nullb_group_attrs[] = { | |
550 | &memb_group_attr_features, | |
551 | NULL, | |
552 | }; | |
553 | ||
554 | static struct configfs_group_operations nullb_group_ops = { | |
555 | .make_item = nullb_group_make_item, | |
556 | .drop_item = nullb_group_drop_item, | |
557 | }; | |
558 | ||
e1919dff | 559 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
560 | .ct_group_ops = &nullb_group_ops, |
561 | .ct_attrs = nullb_group_attrs, | |
562 | .ct_owner = THIS_MODULE, | |
563 | }; | |
564 | ||
565 | static struct configfs_subsystem nullb_subsys = { | |
566 | .su_group = { | |
567 | .cg_item = { | |
568 | .ci_namebuf = "nullb", | |
569 | .ci_type = &nullb_group_type, | |
570 | }, | |
571 | }, | |
572 | }; | |
573 | ||
deb78b41 SL |
574 | static inline int null_cache_active(struct nullb *nullb) |
575 | { | |
576 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
577 | } | |
578 | ||
2984c868 SL |
579 | static struct nullb_device *null_alloc_dev(void) |
580 | { | |
581 | struct nullb_device *dev; | |
582 | ||
583 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
584 | if (!dev) | |
585 | return NULL; | |
5bcd0e0c | 586 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 587 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
588 | if (badblocks_init(&dev->badblocks, 0)) { |
589 | kfree(dev); | |
590 | return NULL; | |
591 | } | |
592 | ||
2984c868 SL |
593 | dev->size = g_gb * 1024; |
594 | dev->completion_nsec = g_completion_nsec; | |
595 | dev->submit_queues = g_submit_queues; | |
596 | dev->home_node = g_home_node; | |
597 | dev->queue_mode = g_queue_mode; | |
598 | dev->blocksize = g_bs; | |
ea17fd35 | 599 | dev->max_sectors = g_max_sectors; |
2984c868 SL |
600 | dev->irqmode = g_irqmode; |
601 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 SL |
602 | dev->blocking = g_blocking; |
603 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
ca4b2a01 MB |
604 | dev->zoned = g_zoned; |
605 | dev->zone_size = g_zone_size; | |
089565fb | 606 | dev->zone_capacity = g_zone_capacity; |
ea2c18e1 | 607 | dev->zone_nr_conv = g_zone_nr_conv; |
dc4d137e NC |
608 | dev->zone_max_open = g_zone_max_open; |
609 | dev->zone_max_active = g_zone_max_active; | |
cee1b215 | 610 | dev->virt_boundary = g_virt_boundary; |
2984c868 SL |
611 | return dev; |
612 | } | |
613 | ||
614 | static void null_free_dev(struct nullb_device *dev) | |
615 | { | |
1addb798 DD |
616 | if (!dev) |
617 | return; | |
618 | ||
d205bde7 | 619 | null_free_zoned_dev(dev); |
1addb798 | 620 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
621 | kfree(dev); |
622 | } | |
623 | ||
f2298c04 JA |
624 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
625 | { | |
626 | clear_bit_unlock(tag, nq->tag_map); | |
627 | ||
628 | if (waitqueue_active(&nq->wait)) | |
629 | wake_up(&nq->wait); | |
630 | } | |
631 | ||
632 | static unsigned int get_tag(struct nullb_queue *nq) | |
633 | { | |
634 | unsigned int tag; | |
635 | ||
636 | do { | |
637 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
638 | if (tag >= nq->queue_depth) | |
639 | return -1U; | |
640 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
641 | ||
642 | return tag; | |
643 | } | |
644 | ||
645 | static void free_cmd(struct nullb_cmd *cmd) | |
646 | { | |
647 | put_tag(cmd->nq, cmd->tag); | |
648 | } | |
649 | ||
3c395a96 PV |
650 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
651 | ||
f2298c04 JA |
652 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
653 | { | |
654 | struct nullb_cmd *cmd; | |
655 | unsigned int tag; | |
656 | ||
657 | tag = get_tag(nq); | |
658 | if (tag != -1U) { | |
659 | cmd = &nq->cmds[tag]; | |
660 | cmd->tag = tag; | |
ff770422 | 661 | cmd->error = BLK_STS_OK; |
f2298c04 | 662 | cmd->nq = nq; |
2984c868 | 663 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
664 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
665 | HRTIMER_MODE_REL); | |
666 | cmd->timer.function = null_cmd_timer_expired; | |
667 | } | |
f2298c04 JA |
668 | return cmd; |
669 | } | |
670 | ||
671 | return NULL; | |
672 | } | |
673 | ||
674 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
675 | { | |
676 | struct nullb_cmd *cmd; | |
677 | DEFINE_WAIT(wait); | |
678 | ||
679 | cmd = __alloc_cmd(nq); | |
680 | if (cmd || !can_wait) | |
681 | return cmd; | |
682 | ||
683 | do { | |
684 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
685 | cmd = __alloc_cmd(nq); | |
686 | if (cmd) | |
687 | break; | |
688 | ||
689 | io_schedule(); | |
690 | } while (1); | |
691 | ||
692 | finish_wait(&nq->wait, &wait); | |
693 | return cmd; | |
694 | } | |
695 | ||
696 | static void end_cmd(struct nullb_cmd *cmd) | |
697 | { | |
2984c868 | 698 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 699 | |
ce2c350b CH |
700 | switch (queue_mode) { |
701 | case NULL_Q_MQ: | |
5bcd0e0c | 702 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b | 703 | return; |
ce2c350b | 704 | case NULL_Q_BIO: |
5bcd0e0c | 705 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 706 | bio_endio(cmd->bio); |
48cc661e | 707 | break; |
ce2c350b | 708 | } |
f2298c04 | 709 | |
48cc661e | 710 | free_cmd(cmd); |
cf8ecc5a AA |
711 | } |
712 | ||
713 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
714 | { | |
715 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
716 | |
717 | return HRTIMER_NORESTART; | |
718 | } | |
719 | ||
720 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
721 | { | |
2984c868 | 722 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 723 | |
3c395a96 | 724 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
725 | } |
726 | ||
49f66136 | 727 | static void null_complete_rq(struct request *rq) |
f2298c04 | 728 | { |
49f66136 | 729 | end_cmd(blk_mq_rq_to_pdu(rq)); |
f2298c04 JA |
730 | } |
731 | ||
5bcd0e0c SL |
732 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
733 | { | |
734 | struct nullb_page *t_page; | |
735 | ||
736 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
737 | if (!t_page) | |
738 | goto out; | |
739 | ||
740 | t_page->page = alloc_pages(gfp_flags, 0); | |
741 | if (!t_page->page) | |
742 | goto out_freepage; | |
743 | ||
66231ad3 | 744 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
745 | return t_page; |
746 | out_freepage: | |
747 | kfree(t_page); | |
748 | out: | |
749 | return NULL; | |
750 | } | |
751 | ||
752 | static void null_free_page(struct nullb_page *t_page) | |
753 | { | |
66231ad3 ML |
754 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
755 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 756 | return; |
5bcd0e0c SL |
757 | __free_page(t_page->page); |
758 | kfree(t_page); | |
759 | } | |
760 | ||
66231ad3 ML |
761 | static bool null_page_empty(struct nullb_page *page) |
762 | { | |
763 | int size = MAP_SZ - 2; | |
764 | ||
765 | return find_first_bit(page->bitmap, size) == size; | |
766 | } | |
767 | ||
deb78b41 SL |
768 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
769 | bool is_cache) | |
5bcd0e0c SL |
770 | { |
771 | unsigned int sector_bit; | |
772 | u64 idx; | |
773 | struct nullb_page *t_page, *ret; | |
774 | struct radix_tree_root *root; | |
775 | ||
deb78b41 | 776 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
777 | idx = sector >> PAGE_SECTORS_SHIFT; |
778 | sector_bit = (sector & SECTOR_MASK); | |
779 | ||
780 | t_page = radix_tree_lookup(root, idx); | |
781 | if (t_page) { | |
66231ad3 | 782 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 783 | |
66231ad3 | 784 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
785 | ret = radix_tree_delete_item(root, idx, t_page); |
786 | WARN_ON(ret != t_page); | |
787 | null_free_page(ret); | |
deb78b41 SL |
788 | if (is_cache) |
789 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
790 | } |
791 | } | |
792 | } | |
793 | ||
794 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 795 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
796 | { |
797 | struct radix_tree_root *root; | |
798 | ||
deb78b41 | 799 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
800 | |
801 | if (radix_tree_insert(root, idx, t_page)) { | |
802 | null_free_page(t_page); | |
803 | t_page = radix_tree_lookup(root, idx); | |
804 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
805 | } else if (is_cache) |
806 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
807 | |
808 | return t_page; | |
809 | } | |
810 | ||
deb78b41 | 811 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
812 | { |
813 | unsigned long pos = 0; | |
814 | int nr_pages; | |
815 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
816 | struct radix_tree_root *root; | |
817 | ||
deb78b41 | 818 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
819 | |
820 | do { | |
821 | int i; | |
822 | ||
823 | nr_pages = radix_tree_gang_lookup(root, | |
824 | (void **)t_pages, pos, FREE_BATCH); | |
825 | ||
826 | for (i = 0; i < nr_pages; i++) { | |
827 | pos = t_pages[i]->page->index; | |
828 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
829 | WARN_ON(ret != t_pages[i]); | |
830 | null_free_page(ret); | |
831 | } | |
832 | ||
833 | pos++; | |
834 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
835 | |
836 | if (is_cache) | |
837 | dev->curr_cache = 0; | |
5bcd0e0c SL |
838 | } |
839 | ||
deb78b41 SL |
840 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
841 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
842 | { |
843 | unsigned int sector_bit; | |
844 | u64 idx; | |
845 | struct nullb_page *t_page; | |
deb78b41 | 846 | struct radix_tree_root *root; |
5bcd0e0c SL |
847 | |
848 | idx = sector >> PAGE_SECTORS_SHIFT; | |
849 | sector_bit = (sector & SECTOR_MASK); | |
850 | ||
deb78b41 SL |
851 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
852 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
853 | WARN_ON(t_page && t_page->page->index != idx); |
854 | ||
66231ad3 | 855 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
856 | return t_page; |
857 | ||
858 | return NULL; | |
859 | } | |
860 | ||
deb78b41 SL |
861 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
862 | sector_t sector, bool for_write, bool ignore_cache) | |
863 | { | |
864 | struct nullb_page *page = NULL; | |
865 | ||
866 | if (!ignore_cache) | |
867 | page = __null_lookup_page(nullb, sector, for_write, true); | |
868 | if (page) | |
869 | return page; | |
870 | return __null_lookup_page(nullb, sector, for_write, false); | |
871 | } | |
872 | ||
5bcd0e0c | 873 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
874 | sector_t sector, bool ignore_cache) |
875 | __releases(&nullb->lock) | |
876 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
877 | { |
878 | u64 idx; | |
879 | struct nullb_page *t_page; | |
880 | ||
deb78b41 | 881 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
882 | if (t_page) |
883 | return t_page; | |
884 | ||
885 | spin_unlock_irq(&nullb->lock); | |
886 | ||
887 | t_page = null_alloc_page(GFP_NOIO); | |
888 | if (!t_page) | |
889 | goto out_lock; | |
890 | ||
891 | if (radix_tree_preload(GFP_NOIO)) | |
892 | goto out_freepage; | |
893 | ||
894 | spin_lock_irq(&nullb->lock); | |
895 | idx = sector >> PAGE_SECTORS_SHIFT; | |
896 | t_page->page->index = idx; | |
deb78b41 | 897 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
898 | radix_tree_preload_end(); |
899 | ||
900 | return t_page; | |
901 | out_freepage: | |
902 | null_free_page(t_page); | |
903 | out_lock: | |
904 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
905 | return null_lookup_page(nullb, sector, true, ignore_cache); |
906 | } | |
907 | ||
908 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
909 | { | |
910 | int i; | |
911 | unsigned int offset; | |
912 | u64 idx; | |
913 | struct nullb_page *t_page, *ret; | |
914 | void *dst, *src; | |
915 | ||
916 | idx = c_page->page->index; | |
917 | ||
918 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
919 | ||
66231ad3 ML |
920 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
921 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 922 | null_free_page(c_page); |
66231ad3 | 923 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
924 | ret = radix_tree_delete_item(&nullb->dev->data, |
925 | idx, t_page); | |
926 | null_free_page(t_page); | |
927 | } | |
928 | return 0; | |
929 | } | |
930 | ||
931 | if (!t_page) | |
932 | return -ENOMEM; | |
933 | ||
934 | src = kmap_atomic(c_page->page); | |
935 | dst = kmap_atomic(t_page->page); | |
936 | ||
937 | for (i = 0; i < PAGE_SECTORS; | |
938 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 939 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
940 | offset = (i << SECTOR_SHIFT); |
941 | memcpy(dst + offset, src + offset, | |
942 | nullb->dev->blocksize); | |
66231ad3 | 943 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
944 | } |
945 | } | |
946 | ||
947 | kunmap_atomic(dst); | |
948 | kunmap_atomic(src); | |
949 | ||
950 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
951 | null_free_page(ret); | |
952 | nullb->dev->curr_cache -= PAGE_SIZE; | |
953 | ||
954 | return 0; | |
955 | } | |
956 | ||
957 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 958 | { |
deb78b41 SL |
959 | int i, err, nr_pages; |
960 | struct nullb_page *c_pages[FREE_BATCH]; | |
961 | unsigned long flushed = 0, one_round; | |
962 | ||
963 | again: | |
964 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
965 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
966 | return 0; | |
967 | ||
968 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
969 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
970 | /* | |
971 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
972 | * avoid race, we don't allow page free | |
973 | */ | |
974 | for (i = 0; i < nr_pages; i++) { | |
975 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
976 | /* | |
977 | * We found the page which is being flushed to disk by other | |
978 | * threads | |
979 | */ | |
66231ad3 | 980 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
981 | c_pages[i] = NULL; |
982 | else | |
66231ad3 | 983 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
984 | } |
985 | ||
986 | one_round = 0; | |
987 | for (i = 0; i < nr_pages; i++) { | |
988 | if (c_pages[i] == NULL) | |
989 | continue; | |
990 | err = null_flush_cache_page(nullb, c_pages[i]); | |
991 | if (err) | |
992 | return err; | |
993 | one_round++; | |
994 | } | |
995 | flushed += one_round << PAGE_SHIFT; | |
996 | ||
997 | if (n > flushed) { | |
998 | if (nr_pages == 0) | |
999 | nullb->cache_flush_pos = 0; | |
1000 | if (one_round == 0) { | |
1001 | /* give other threads a chance */ | |
1002 | spin_unlock_irq(&nullb->lock); | |
1003 | spin_lock_irq(&nullb->lock); | |
1004 | } | |
1005 | goto again; | |
1006 | } | |
1007 | return 0; | |
5bcd0e0c SL |
1008 | } |
1009 | ||
1010 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 1011 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
1012 | { |
1013 | size_t temp, count = 0; | |
1014 | unsigned int offset; | |
1015 | struct nullb_page *t_page; | |
1016 | void *dst, *src; | |
1017 | ||
1018 | while (count < n) { | |
1019 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1020 | ||
deb78b41 SL |
1021 | if (null_cache_active(nullb) && !is_fua) |
1022 | null_make_cache_space(nullb, PAGE_SIZE); | |
1023 | ||
5bcd0e0c | 1024 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
1025 | t_page = null_insert_page(nullb, sector, |
1026 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
1027 | if (!t_page) |
1028 | return -ENOSPC; | |
1029 | ||
1030 | src = kmap_atomic(source); | |
1031 | dst = kmap_atomic(t_page->page); | |
1032 | memcpy(dst + offset, src + off + count, temp); | |
1033 | kunmap_atomic(dst); | |
1034 | kunmap_atomic(src); | |
1035 | ||
66231ad3 | 1036 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 1037 | |
deb78b41 SL |
1038 | if (is_fua) |
1039 | null_free_sector(nullb, sector, true); | |
1040 | ||
5bcd0e0c SL |
1041 | count += temp; |
1042 | sector += temp >> SECTOR_SHIFT; | |
1043 | } | |
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1048 | unsigned int off, sector_t sector, size_t n) | |
1049 | { | |
1050 | size_t temp, count = 0; | |
1051 | unsigned int offset; | |
1052 | struct nullb_page *t_page; | |
1053 | void *dst, *src; | |
1054 | ||
1055 | while (count < n) { | |
1056 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1057 | ||
1058 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1059 | t_page = null_lookup_page(nullb, sector, false, |
1060 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
1061 | |
1062 | dst = kmap_atomic(dest); | |
1063 | if (!t_page) { | |
1064 | memset(dst + off + count, 0, temp); | |
1065 | goto next; | |
1066 | } | |
1067 | src = kmap_atomic(t_page->page); | |
1068 | memcpy(dst + off + count, src + offset, temp); | |
1069 | kunmap_atomic(src); | |
1070 | next: | |
1071 | kunmap_atomic(dst); | |
1072 | ||
1073 | count += temp; | |
1074 | sector += temp >> SECTOR_SHIFT; | |
1075 | } | |
1076 | return 0; | |
1077 | } | |
1078 | ||
dd85b492 AJ |
1079 | static void nullb_fill_pattern(struct nullb *nullb, struct page *page, |
1080 | unsigned int len, unsigned int off) | |
1081 | { | |
1082 | void *dst; | |
1083 | ||
1084 | dst = kmap_atomic(page); | |
1085 | memset(dst + off, 0xFF, len); | |
1086 | kunmap_atomic(dst); | |
1087 | } | |
1088 | ||
0ec4d913 DLM |
1089 | blk_status_t null_handle_discard(struct nullb_device *dev, |
1090 | sector_t sector, sector_t nr_sectors) | |
306eb6b4 | 1091 | { |
49c7089f DLM |
1092 | struct nullb *nullb = dev->nullb; |
1093 | size_t n = nr_sectors << SECTOR_SHIFT; | |
306eb6b4 SL |
1094 | size_t temp; |
1095 | ||
1096 | spin_lock_irq(&nullb->lock); | |
1097 | while (n > 0) { | |
49c7089f | 1098 | temp = min_t(size_t, n, dev->blocksize); |
deb78b41 SL |
1099 | null_free_sector(nullb, sector, false); |
1100 | if (null_cache_active(nullb)) | |
1101 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1102 | sector += temp >> SECTOR_SHIFT; |
1103 | n -= temp; | |
1104 | } | |
1105 | spin_unlock_irq(&nullb->lock); | |
49c7089f DLM |
1106 | |
1107 | return BLK_STS_OK; | |
306eb6b4 SL |
1108 | } |
1109 | ||
deb78b41 SL |
1110 | static int null_handle_flush(struct nullb *nullb) |
1111 | { | |
1112 | int err; | |
1113 | ||
1114 | if (!null_cache_active(nullb)) | |
1115 | return 0; | |
1116 | ||
1117 | spin_lock_irq(&nullb->lock); | |
1118 | while (true) { | |
1119 | err = null_make_cache_space(nullb, | |
1120 | nullb->dev->cache_size * 1024 * 1024); | |
1121 | if (err || nullb->dev->curr_cache == 0) | |
1122 | break; | |
1123 | } | |
1124 | ||
1125 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1126 | spin_unlock_irq(&nullb->lock); | |
1127 | return err; | |
1128 | } | |
1129 | ||
5bcd0e0c | 1130 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1131 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1132 | bool is_fua) | |
f2298c04 | 1133 | { |
dd85b492 AJ |
1134 | struct nullb_device *dev = nullb->dev; |
1135 | unsigned int valid_len = len; | |
5bcd0e0c SL |
1136 | int err = 0; |
1137 | ||
1138 | if (!is_write) { | |
dd85b492 AJ |
1139 | if (dev->zoned) |
1140 | valid_len = null_zone_valid_read_len(nullb, | |
1141 | sector, len); | |
1142 | ||
1143 | if (valid_len) { | |
1144 | err = copy_from_nullb(nullb, page, off, | |
1145 | sector, valid_len); | |
1146 | off += valid_len; | |
1147 | len -= valid_len; | |
1148 | } | |
1149 | ||
1150 | if (len) | |
1151 | nullb_fill_pattern(nullb, page, len, off); | |
5bcd0e0c SL |
1152 | flush_dcache_page(page); |
1153 | } else { | |
1154 | flush_dcache_page(page); | |
deb78b41 | 1155 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1156 | } |
1157 | ||
1158 | return err; | |
1159 | } | |
1160 | ||
1161 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1162 | { | |
1163 | struct request *rq = cmd->rq; | |
1164 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1165 | int err; | |
1166 | unsigned int len; | |
49c7089f | 1167 | sector_t sector = blk_rq_pos(rq); |
5bcd0e0c SL |
1168 | struct req_iterator iter; |
1169 | struct bio_vec bvec; | |
1170 | ||
5bcd0e0c SL |
1171 | spin_lock_irq(&nullb->lock); |
1172 | rq_for_each_segment(bvec, rq, iter) { | |
1173 | len = bvec.bv_len; | |
1174 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1175 | op_is_write(req_op(rq)), sector, |
2d62e6b0 | 1176 | rq->cmd_flags & REQ_FUA); |
5bcd0e0c SL |
1177 | if (err) { |
1178 | spin_unlock_irq(&nullb->lock); | |
1179 | return err; | |
1180 | } | |
1181 | sector += len >> SECTOR_SHIFT; | |
1182 | } | |
1183 | spin_unlock_irq(&nullb->lock); | |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1189 | { | |
1190 | struct bio *bio = cmd->bio; | |
1191 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1192 | int err; | |
1193 | unsigned int len; | |
49c7089f | 1194 | sector_t sector = bio->bi_iter.bi_sector; |
5bcd0e0c SL |
1195 | struct bio_vec bvec; |
1196 | struct bvec_iter iter; | |
1197 | ||
5bcd0e0c SL |
1198 | spin_lock_irq(&nullb->lock); |
1199 | bio_for_each_segment(bvec, bio, iter) { | |
1200 | len = bvec.bv_len; | |
1201 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1202 | op_is_write(bio_op(bio)), sector, |
bf7c7a04 | 1203 | bio->bi_opf & REQ_FUA); |
5bcd0e0c SL |
1204 | if (err) { |
1205 | spin_unlock_irq(&nullb->lock); | |
1206 | return err; | |
1207 | } | |
1208 | sector += len >> SECTOR_SHIFT; | |
1209 | } | |
1210 | spin_unlock_irq(&nullb->lock); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
eff2c4f1 SL |
1214 | static void null_stop_queue(struct nullb *nullb) |
1215 | { | |
1216 | struct request_queue *q = nullb->q; | |
1217 | ||
1218 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1219 | blk_mq_stop_hw_queues(q); | |
eff2c4f1 SL |
1220 | } |
1221 | ||
1222 | static void null_restart_queue_async(struct nullb *nullb) | |
1223 | { | |
1224 | struct request_queue *q = nullb->q; | |
eff2c4f1 SL |
1225 | |
1226 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1227 | blk_mq_start_stopped_hw_queues(q, true); | |
eff2c4f1 SL |
1228 | } |
1229 | ||
adb84284 CK |
1230 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
1231 | { | |
1232 | struct nullb_device *dev = cmd->nq->dev; | |
1233 | struct nullb *nullb = dev->nullb; | |
1234 | blk_status_t sts = BLK_STS_OK; | |
1235 | struct request *rq = cmd->rq; | |
1236 | ||
1237 | if (!hrtimer_active(&nullb->bw_timer)) | |
1238 | hrtimer_restart(&nullb->bw_timer); | |
1239 | ||
1240 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { | |
1241 | null_stop_queue(nullb); | |
1242 | /* race with timer */ | |
1243 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1244 | null_restart_queue_async(nullb); | |
1245 | /* requeue request */ | |
1246 | sts = BLK_STS_DEV_RESOURCE; | |
1247 | } | |
1248 | return sts; | |
1249 | } | |
1250 | ||
8f94d1c1 CK |
1251 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
1252 | sector_t sector, | |
1253 | sector_t nr_sectors) | |
1254 | { | |
1255 | struct badblocks *bb = &cmd->nq->dev->badblocks; | |
1256 | sector_t first_bad; | |
1257 | int bad_sectors; | |
1258 | ||
1259 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) | |
1260 | return BLK_STS_IOERR; | |
1261 | ||
1262 | return BLK_STS_OK; | |
1263 | } | |
1264 | ||
7ea88e22 | 1265 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
49c7089f DLM |
1266 | enum req_opf op, |
1267 | sector_t sector, | |
1268 | sector_t nr_sectors) | |
7ea88e22 CK |
1269 | { |
1270 | struct nullb_device *dev = cmd->nq->dev; | |
1271 | int err; | |
1272 | ||
49c7089f DLM |
1273 | if (op == REQ_OP_DISCARD) |
1274 | return null_handle_discard(dev, sector, nr_sectors); | |
1275 | ||
7ea88e22 CK |
1276 | if (dev->queue_mode == NULL_Q_BIO) |
1277 | err = null_handle_bio(cmd); | |
1278 | else | |
1279 | err = null_handle_rq(cmd); | |
1280 | ||
1281 | return errno_to_blk_status(err); | |
1282 | } | |
1283 | ||
cecbc9ce BVA |
1284 | static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd) |
1285 | { | |
1286 | struct nullb_device *dev = cmd->nq->dev; | |
1287 | struct bio *bio; | |
1288 | ||
1289 | if (dev->memory_backed) | |
1290 | return; | |
1291 | ||
1292 | if (dev->queue_mode == NULL_Q_BIO && bio_op(cmd->bio) == REQ_OP_READ) { | |
1293 | zero_fill_bio(cmd->bio); | |
1294 | } else if (req_op(cmd->rq) == REQ_OP_READ) { | |
1295 | __rq_for_each_bio(bio, cmd->rq) | |
1296 | zero_fill_bio(bio); | |
1297 | } | |
1298 | } | |
1299 | ||
a3d7d674 CK |
1300 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
1301 | { | |
cecbc9ce BVA |
1302 | /* |
1303 | * Since root privileges are required to configure the null_blk | |
1304 | * driver, it is fine that this driver does not initialize the | |
1305 | * data buffers of read commands. Zero-initialize these buffers | |
1306 | * anyway if KMSAN is enabled to prevent that KMSAN complains | |
1307 | * about null_blk not initializing read data buffers. | |
1308 | */ | |
1309 | if (IS_ENABLED(CONFIG_KMSAN)) | |
1310 | nullb_zero_read_cmd_buffer(cmd); | |
1311 | ||
a3d7d674 CK |
1312 | /* Complete IO by inline, softirq or timer */ |
1313 | switch (cmd->nq->dev->irqmode) { | |
1314 | case NULL_IRQ_SOFTIRQ: | |
1315 | switch (cmd->nq->dev->queue_mode) { | |
1316 | case NULL_Q_MQ: | |
15f73f5b CH |
1317 | if (likely(!blk_should_fake_timeout(cmd->rq->q))) |
1318 | blk_mq_complete_request(cmd->rq); | |
a3d7d674 CK |
1319 | break; |
1320 | case NULL_Q_BIO: | |
1321 | /* | |
1322 | * XXX: no proper submitting cpu information available. | |
1323 | */ | |
1324 | end_cmd(cmd); | |
1325 | break; | |
1326 | } | |
1327 | break; | |
1328 | case NULL_IRQ_NONE: | |
1329 | end_cmd(cmd); | |
1330 | break; | |
1331 | case NULL_IRQ_TIMER: | |
1332 | null_cmd_end_timer(cmd); | |
1333 | break; | |
1334 | } | |
1335 | } | |
1336 | ||
9dd44c7e DLM |
1337 | blk_status_t null_process_cmd(struct nullb_cmd *cmd, |
1338 | enum req_opf op, sector_t sector, | |
1339 | unsigned int nr_sectors) | |
1340 | { | |
1341 | struct nullb_device *dev = cmd->nq->dev; | |
1342 | blk_status_t ret; | |
1343 | ||
1344 | if (dev->badblocks.shift != -1) { | |
1345 | ret = null_handle_badblocks(cmd, sector, nr_sectors); | |
1346 | if (ret != BLK_STS_OK) | |
1347 | return ret; | |
1348 | } | |
1349 | ||
1350 | if (dev->memory_backed) | |
49c7089f | 1351 | return null_handle_memory_backed(cmd, op, sector, nr_sectors); |
9dd44c7e DLM |
1352 | |
1353 | return BLK_STS_OK; | |
1354 | } | |
1355 | ||
d4b186ed CK |
1356 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
1357 | sector_t nr_sectors, enum req_opf op) | |
5bcd0e0c SL |
1358 | { |
1359 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1360 | struct nullb *nullb = dev->nullb; |
adb84284 | 1361 | blk_status_t sts; |
5bcd0e0c | 1362 | |
eff2c4f1 | 1363 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
adb84284 CK |
1364 | sts = null_handle_throttled(cmd); |
1365 | if (sts != BLK_STS_OK) | |
1366 | return sts; | |
eff2c4f1 SL |
1367 | } |
1368 | ||
d4b186ed CK |
1369 | if (op == REQ_OP_FLUSH) { |
1370 | cmd->error = errno_to_blk_status(null_handle_flush(nullb)); | |
1371 | goto out; | |
1372 | } | |
d4b186ed | 1373 | |
9dd44c7e | 1374 | if (dev->zoned) |
de3510e5 | 1375 | sts = null_process_zoned_cmd(cmd, op, sector, nr_sectors); |
9dd44c7e | 1376 | else |
de3510e5 DLM |
1377 | sts = null_process_cmd(cmd, op, sector, nr_sectors); |
1378 | ||
1379 | /* Do not overwrite errors (e.g. timeout errors) */ | |
1380 | if (cmd->error == BLK_STS_OK) | |
1381 | cmd->error = sts; | |
fceb5d1b | 1382 | |
2f54a613 | 1383 | out: |
a3d7d674 | 1384 | nullb_complete_cmd(cmd); |
5bcd0e0c | 1385 | return BLK_STS_OK; |
f2298c04 JA |
1386 | } |
1387 | ||
eff2c4f1 SL |
1388 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1389 | { | |
1390 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1391 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1392 | unsigned int mbps = nullb->dev->mbps; | |
1393 | ||
1394 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1395 | return HRTIMER_NORESTART; | |
1396 | ||
1397 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1398 | null_restart_queue_async(nullb); | |
1399 | ||
1400 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1401 | ||
1402 | return HRTIMER_RESTART; | |
1403 | } | |
1404 | ||
1405 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1406 | { | |
1407 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1408 | ||
1409 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1410 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1411 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1412 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1413 | } |
1414 | ||
1415 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1416 | { | |
1417 | int index = 0; | |
1418 | ||
1419 | if (nullb->nr_queues != 1) | |
1420 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1421 | ||
1422 | return &nullb->queues[index]; | |
1423 | } | |
1424 | ||
3e08773c | 1425 | static void null_submit_bio(struct bio *bio) |
f2298c04 | 1426 | { |
d4b186ed CK |
1427 | sector_t sector = bio->bi_iter.bi_sector; |
1428 | sector_t nr_sectors = bio_sectors(bio); | |
309dca30 | 1429 | struct nullb *nullb = bio->bi_bdev->bd_disk->private_data; |
f2298c04 JA |
1430 | struct nullb_queue *nq = nullb_to_queue(nullb); |
1431 | struct nullb_cmd *cmd; | |
1432 | ||
1433 | cmd = alloc_cmd(nq, 1); | |
1434 | cmd->bio = bio; | |
1435 | ||
d4b186ed | 1436 | null_handle_cmd(cmd, sector, nr_sectors, bio_op(bio)); |
f2298c04 JA |
1437 | } |
1438 | ||
93b57046 JA |
1439 | static bool should_timeout_request(struct request *rq) |
1440 | { | |
33f782c4 | 1441 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 JA |
1442 | if (g_timeout_str[0]) |
1443 | return should_fail(&null_timeout_attr, 1); | |
33f782c4 | 1444 | #endif |
24941b90 JA |
1445 | return false; |
1446 | } | |
93b57046 | 1447 | |
24941b90 JA |
1448 | static bool should_requeue_request(struct request *rq) |
1449 | { | |
1450 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1451 | if (g_requeue_str[0]) | |
1452 | return should_fail(&null_requeue_attr, 1); | |
1453 | #endif | |
93b57046 JA |
1454 | return false; |
1455 | } | |
1456 | ||
5448aca4 JA |
1457 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res) |
1458 | { | |
de3510e5 DLM |
1459 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); |
1460 | ||
9c7eddf1 | 1461 | pr_info("rq %p timed out\n", rq); |
de3510e5 DLM |
1462 | |
1463 | /* | |
1464 | * If the device is marked as blocking (i.e. memory backed or zoned | |
1465 | * device), the submission path may be blocked waiting for resources | |
1466 | * and cause real timeouts. For these real timeouts, the submission | |
1467 | * path will complete the request using blk_mq_complete_request(). | |
1468 | * Only fake timeouts need to execute blk_mq_complete_request() here. | |
1469 | */ | |
1470 | cmd->error = BLK_STS_TIMEOUT; | |
1471 | if (cmd->fake_timeout) | |
1472 | blk_mq_complete_request(rq); | |
0df0bb08 | 1473 | return BLK_EH_DONE; |
5448aca4 JA |
1474 | } |
1475 | ||
fc17b653 | 1476 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1477 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1478 | { |
74c45052 | 1479 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1480 | struct nullb_queue *nq = hctx->driver_data; |
d4b186ed CK |
1481 | sector_t nr_sectors = blk_rq_sectors(bd->rq); |
1482 | sector_t sector = blk_rq_pos(bd->rq); | |
f2298c04 | 1483 | |
db5bcf87 JA |
1484 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1485 | ||
2984c868 | 1486 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1487 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1488 | cmd->timer.function = null_cmd_timer_expired; | |
1489 | } | |
74c45052 | 1490 | cmd->rq = bd->rq; |
ff770422 | 1491 | cmd->error = BLK_STS_OK; |
2984c868 | 1492 | cmd->nq = nq; |
de3510e5 | 1493 | cmd->fake_timeout = should_timeout_request(bd->rq); |
f2298c04 | 1494 | |
74c45052 | 1495 | blk_mq_start_request(bd->rq); |
e2490073 | 1496 | |
24941b90 JA |
1497 | if (should_requeue_request(bd->rq)) { |
1498 | /* | |
1499 | * Alternate between hitting the core BUSY path, and the | |
1500 | * driver driven requeue path | |
1501 | */ | |
1502 | nq->requeue_selection++; | |
1503 | if (nq->requeue_selection & 1) | |
1504 | return BLK_STS_RESOURCE; | |
1505 | else { | |
1506 | blk_mq_requeue_request(bd->rq, true); | |
1507 | return BLK_STS_OK; | |
1508 | } | |
1509 | } | |
de3510e5 | 1510 | if (cmd->fake_timeout) |
24941b90 | 1511 | return BLK_STS_OK; |
93b57046 | 1512 | |
d4b186ed | 1513 | return null_handle_cmd(cmd, sector, nr_sectors, req_op(bd->rq)); |
f2298c04 JA |
1514 | } |
1515 | ||
de65d2d2 MB |
1516 | static void cleanup_queue(struct nullb_queue *nq) |
1517 | { | |
1518 | kfree(nq->tag_map); | |
1519 | kfree(nq->cmds); | |
1520 | } | |
1521 | ||
1522 | static void cleanup_queues(struct nullb *nullb) | |
1523 | { | |
1524 | int i; | |
1525 | ||
1526 | for (i = 0; i < nullb->nr_queues; i++) | |
1527 | cleanup_queue(&nullb->queues[i]); | |
1528 | ||
1529 | kfree(nullb->queues); | |
1530 | } | |
1531 | ||
78b10be2 BVA |
1532 | static void null_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
1533 | { | |
1534 | struct nullb_queue *nq = hctx->driver_data; | |
1535 | struct nullb *nullb = nq->dev->nullb; | |
1536 | ||
1537 | nullb->nr_queues--; | |
1538 | } | |
1539 | ||
1540 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) | |
1541 | { | |
1542 | init_waitqueue_head(&nq->wait); | |
1543 | nq->queue_depth = nullb->queue_depth; | |
1544 | nq->dev = nullb->dev; | |
1545 | } | |
1546 | ||
1547 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, | |
1548 | unsigned int hctx_idx) | |
1549 | { | |
1550 | struct nullb *nullb = hctx->queue->queuedata; | |
1551 | struct nullb_queue *nq; | |
1552 | ||
596444e7 BVA |
1553 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
1554 | if (g_init_hctx_str[0] && should_fail(&null_init_hctx_attr, 1)) | |
1555 | return -EFAULT; | |
1556 | #endif | |
1557 | ||
78b10be2 BVA |
1558 | nq = &nullb->queues[hctx_idx]; |
1559 | hctx->driver_data = nq; | |
1560 | null_init_queue(nullb, nq); | |
1561 | nullb->nr_queues++; | |
1562 | ||
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | static const struct blk_mq_ops null_mq_ops = { | |
1567 | .queue_rq = null_queue_rq, | |
1568 | .complete = null_complete_rq, | |
1569 | .timeout = null_timeout_rq, | |
1570 | .init_hctx = null_init_hctx, | |
1571 | .exit_hctx = null_exit_hctx, | |
1572 | }; | |
1573 | ||
9ae2d0aa MB |
1574 | static void null_del_dev(struct nullb *nullb) |
1575 | { | |
9b03b713 BVA |
1576 | struct nullb_device *dev; |
1577 | ||
1578 | if (!nullb) | |
1579 | return; | |
1580 | ||
1581 | dev = nullb->dev; | |
2984c868 | 1582 | |
94bc02e3 SL |
1583 | ida_simple_remove(&nullb_indexes, nullb->index); |
1584 | ||
9ae2d0aa MB |
1585 | list_del_init(&nullb->list); |
1586 | ||
74ede5af | 1587 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1588 | |
1589 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1590 | hrtimer_cancel(&nullb->bw_timer); | |
1591 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1592 | null_restart_queue_async(nullb); | |
1593 | } | |
1594 | ||
132226b3 | 1595 | blk_cleanup_disk(nullb->disk); |
2984c868 SL |
1596 | if (dev->queue_mode == NULL_Q_MQ && |
1597 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1598 | blk_mq_free_tag_set(nullb->tag_set); |
9ae2d0aa | 1599 | cleanup_queues(nullb); |
deb78b41 SL |
1600 | if (null_cache_active(nullb)) |
1601 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1602 | kfree(nullb); |
2984c868 | 1603 | dev->nullb = NULL; |
9ae2d0aa MB |
1604 | } |
1605 | ||
306eb6b4 SL |
1606 | static void null_config_discard(struct nullb *nullb) |
1607 | { | |
1608 | if (nullb->dev->discard == false) | |
1609 | return; | |
1592cd15 | 1610 | |
49c7089f DLM |
1611 | if (!nullb->dev->memory_backed) { |
1612 | nullb->dev->discard = false; | |
1613 | pr_info("discard option is ignored without memory backing\n"); | |
1614 | return; | |
1615 | } | |
1616 | ||
1592cd15 CK |
1617 | if (nullb->dev->zoned) { |
1618 | nullb->dev->discard = false; | |
1619 | pr_info("discard option is ignored in zoned mode\n"); | |
1620 | return; | |
1621 | } | |
1622 | ||
306eb6b4 SL |
1623 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; |
1624 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1625 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
8b904b5b | 1626 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q); |
9ae2d0aa MB |
1627 | } |
1628 | ||
c62b37d9 CH |
1629 | static const struct block_device_operations null_bio_ops = { |
1630 | .owner = THIS_MODULE, | |
1631 | .submit_bio = null_submit_bio, | |
1632 | .report_zones = null_report_zones, | |
1633 | }; | |
1634 | ||
1635 | static const struct block_device_operations null_rq_ops = { | |
e3f89564 | 1636 | .owner = THIS_MODULE, |
7fc8fb51 | 1637 | .report_zones = null_report_zones, |
f2298c04 JA |
1638 | }; |
1639 | ||
1640 | static int setup_commands(struct nullb_queue *nq) | |
1641 | { | |
1642 | struct nullb_cmd *cmd; | |
1643 | int i, tag_size; | |
1644 | ||
6396bb22 | 1645 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
f2298c04 | 1646 | if (!nq->cmds) |
2d263a78 | 1647 | return -ENOMEM; |
f2298c04 JA |
1648 | |
1649 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
6396bb22 | 1650 | nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL); |
f2298c04 JA |
1651 | if (!nq->tag_map) { |
1652 | kfree(nq->cmds); | |
2d263a78 | 1653 | return -ENOMEM; |
f2298c04 JA |
1654 | } |
1655 | ||
1656 | for (i = 0; i < nq->queue_depth; i++) { | |
1657 | cmd = &nq->cmds[i]; | |
f2298c04 JA |
1658 | cmd->tag = -1U; |
1659 | } | |
1660 | ||
1661 | return 0; | |
1662 | } | |
1663 | ||
f2298c04 JA |
1664 | static int setup_queues(struct nullb *nullb) |
1665 | { | |
78b10be2 | 1666 | nullb->queues = kcalloc(nr_cpu_ids, sizeof(struct nullb_queue), |
6396bb22 | 1667 | GFP_KERNEL); |
f2298c04 | 1668 | if (!nullb->queues) |
2d263a78 | 1669 | return -ENOMEM; |
f2298c04 | 1670 | |
2984c868 | 1671 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1672 | |
2d263a78 MB |
1673 | return 0; |
1674 | } | |
1675 | ||
1676 | static int init_driver_queues(struct nullb *nullb) | |
1677 | { | |
1678 | struct nullb_queue *nq; | |
1679 | int i, ret = 0; | |
f2298c04 | 1680 | |
2984c868 | 1681 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1682 | nq = &nullb->queues[i]; |
2d263a78 MB |
1683 | |
1684 | null_init_queue(nullb, nq); | |
1685 | ||
1686 | ret = setup_commands(nq); | |
1687 | if (ret) | |
31f9690e | 1688 | return ret; |
f2298c04 JA |
1689 | nullb->nr_queues++; |
1690 | } | |
2d263a78 | 1691 | return 0; |
f2298c04 JA |
1692 | } |
1693 | ||
9ae2d0aa | 1694 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 | 1695 | { |
979d5447 | 1696 | sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT; |
132226b3 | 1697 | struct gendisk *disk = nullb->disk; |
9ae2d0aa | 1698 | |
979d5447 | 1699 | set_capacity(disk, size); |
9ae2d0aa MB |
1700 | |
1701 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1702 | disk->major = null_major; | |
1703 | disk->first_minor = nullb->index; | |
132226b3 | 1704 | disk->minors = 1; |
c62b37d9 CH |
1705 | if (queue_is_mq(nullb->q)) |
1706 | disk->fops = &null_rq_ops; | |
1707 | else | |
1708 | disk->fops = &null_bio_ops; | |
9ae2d0aa | 1709 | disk->private_data = nullb; |
9ae2d0aa MB |
1710 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); |
1711 | ||
bf505456 | 1712 | if (nullb->dev->zoned) { |
d205bde7 DLM |
1713 | int ret = null_register_zoned_dev(nullb); |
1714 | ||
1715 | if (ret) | |
1716 | return ret; | |
bf505456 DLM |
1717 | } |
1718 | ||
10e7123d | 1719 | return add_disk(disk); |
9ae2d0aa MB |
1720 | } |
1721 | ||
2984c868 | 1722 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1723 | { |
1724 | set->ops = &null_mq_ops; | |
2984c868 SL |
1725 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1726 | g_submit_queues; | |
1727 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1728 | g_hw_queue_depth; | |
1729 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1730 | set->cmd_size = sizeof(struct nullb_cmd); |
1731 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1732 | if (g_no_sched) |
1733 | set->flags |= BLK_MQ_F_NO_SCHED; | |
0905053b JG |
1734 | if (g_shared_tag_bitmap) |
1735 | set->flags |= BLK_MQ_F_TAG_HCTX_SHARED; | |
82f402fe JA |
1736 | set->driver_data = NULL; |
1737 | ||
0d06a42f | 1738 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1739 | set->flags |= BLK_MQ_F_BLOCKING; |
1740 | ||
1741 | return blk_mq_alloc_tag_set(set); | |
1742 | } | |
1743 | ||
5c4bd1f4 | 1744 | static int null_validate_conf(struct nullb_device *dev) |
cedcafad SL |
1745 | { |
1746 | dev->blocksize = round_down(dev->blocksize, 512); | |
1747 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad SL |
1748 | |
1749 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1750 | if (dev->submit_queues != nr_online_nodes) | |
1751 | dev->submit_queues = nr_online_nodes; | |
1752 | } else if (dev->submit_queues > nr_cpu_ids) | |
1753 | dev->submit_queues = nr_cpu_ids; | |
1754 | else if (dev->submit_queues == 0) | |
1755 | dev->submit_queues = 1; | |
1756 | ||
1757 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1758 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1759 | |
1760 | /* Do memory allocation, so set blocking */ | |
1761 | if (dev->memory_backed) | |
1762 | dev->blocking = true; | |
deb78b41 SL |
1763 | else /* cache is meaningless */ |
1764 | dev->cache_size = 0; | |
1765 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1766 | dev->cache_size); | |
eff2c4f1 SL |
1767 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1768 | /* can not stop a queue */ | |
1769 | if (dev->queue_mode == NULL_Q_BIO) | |
1770 | dev->mbps = 0; | |
5c4bd1f4 DLM |
1771 | |
1772 | if (dev->zoned && | |
1773 | (!dev->zone_size || !is_power_of_2(dev->zone_size))) { | |
1774 | pr_err("zone_size must be power-of-two\n"); | |
1775 | return -EINVAL; | |
1776 | } | |
1777 | ||
1778 | return 0; | |
cedcafad SL |
1779 | } |
1780 | ||
33f782c4 | 1781 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1782 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1783 | { | |
1784 | if (!str[0]) | |
93b57046 JA |
1785 | return true; |
1786 | ||
24941b90 | 1787 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1788 | return false; |
1789 | ||
24941b90 JA |
1790 | attr->verbose = 0; |
1791 | return true; | |
1792 | } | |
1793 | #endif | |
1794 | ||
1795 | static bool null_setup_fault(void) | |
1796 | { | |
1797 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1798 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1799 | return false; | |
1800 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1801 | return false; | |
596444e7 BVA |
1802 | if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str)) |
1803 | return false; | |
33f782c4 | 1804 | #endif |
93b57046 JA |
1805 | return true; |
1806 | } | |
1807 | ||
2984c868 | 1808 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1809 | { |
1810 | struct nullb *nullb; | |
dc501dc0 | 1811 | int rv; |
f2298c04 | 1812 | |
5c4bd1f4 DLM |
1813 | rv = null_validate_conf(dev); |
1814 | if (rv) | |
1815 | return rv; | |
cedcafad | 1816 | |
2984c868 | 1817 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1818 | if (!nullb) { |
1819 | rv = -ENOMEM; | |
24d2f903 | 1820 | goto out; |
dc501dc0 | 1821 | } |
2984c868 SL |
1822 | nullb->dev = dev; |
1823 | dev->nullb = nullb; | |
f2298c04 JA |
1824 | |
1825 | spin_lock_init(&nullb->lock); | |
1826 | ||
dc501dc0 RE |
1827 | rv = setup_queues(nullb); |
1828 | if (rv) | |
24d2f903 | 1829 | goto out_free_nullb; |
f2298c04 | 1830 | |
2984c868 | 1831 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1832 | if (shared_tags) { |
1833 | nullb->tag_set = &tag_set; | |
1834 | rv = 0; | |
1835 | } else { | |
1836 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1837 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1838 | } |
1839 | ||
dc501dc0 | 1840 | if (rv) |
24d2f903 CH |
1841 | goto out_cleanup_queues; |
1842 | ||
93b57046 | 1843 | if (!null_setup_fault()) |
132226b3 | 1844 | goto out_cleanup_tags; |
93b57046 | 1845 | |
5448aca4 | 1846 | nullb->tag_set->timeout = 5 * HZ; |
6759b1a2 CH |
1847 | nullb->disk = blk_mq_alloc_disk(nullb->tag_set, nullb); |
1848 | if (IS_ERR(nullb->disk)) { | |
1849 | rv = PTR_ERR(nullb->disk); | |
24d2f903 | 1850 | goto out_cleanup_tags; |
6759b1a2 CH |
1851 | } |
1852 | nullb->q = nullb->disk->queue; | |
2984c868 | 1853 | } else if (dev->queue_mode == NULL_Q_BIO) { |
132226b3 CH |
1854 | rv = -ENOMEM; |
1855 | nullb->disk = blk_alloc_disk(nullb->dev->home_node); | |
1856 | if (!nullb->disk) | |
24d2f903 | 1857 | goto out_cleanup_queues; |
132226b3 CH |
1858 | |
1859 | nullb->q = nullb->disk->queue; | |
31f9690e JK |
1860 | rv = init_driver_queues(nullb); |
1861 | if (rv) | |
132226b3 | 1862 | goto out_cleanup_disk; |
f2298c04 JA |
1863 | } |
1864 | ||
eff2c4f1 SL |
1865 | if (dev->mbps) { |
1866 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1867 | nullb_setup_bwtimer(nullb); | |
1868 | } | |
1869 | ||
deb78b41 SL |
1870 | if (dev->cache_size > 0) { |
1871 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1872 | blk_queue_write_cache(nullb->q, true, true); | |
deb78b41 SL |
1873 | } |
1874 | ||
ca4b2a01 | 1875 | if (dev->zoned) { |
d205bde7 | 1876 | rv = null_init_zoned_dev(dev, nullb->q); |
ca4b2a01 | 1877 | if (rv) |
132226b3 | 1878 | goto out_cleanup_disk; |
ca4b2a01 MB |
1879 | } |
1880 | ||
f2298c04 | 1881 | nullb->q->queuedata = nullb; |
8b904b5b BVA |
1882 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
1883 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); | |
f2298c04 | 1884 | |
f2298c04 | 1885 | mutex_lock(&lock); |
94bc02e3 | 1886 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1887 | dev->index = nullb->index; |
f2298c04 JA |
1888 | mutex_unlock(&lock); |
1889 | ||
2984c868 SL |
1890 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1891 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
ea17fd35 DLM |
1892 | if (!dev->max_sectors) |
1893 | dev->max_sectors = queue_max_hw_sectors(nullb->q); | |
1894 | dev->max_sectors = min_t(unsigned int, dev->max_sectors, | |
1895 | BLK_DEF_MAX_SECTORS); | |
1896 | blk_queue_max_hw_sectors(nullb->q, dev->max_sectors); | |
f2298c04 | 1897 | |
cee1b215 MG |
1898 | if (dev->virt_boundary) |
1899 | blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1); | |
1900 | ||
306eb6b4 | 1901 | null_config_discard(nullb); |
f2298c04 | 1902 | |
b2b7e001 MB |
1903 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1904 | ||
74ede5af | 1905 | rv = null_gendisk_register(nullb); |
9ae2d0aa | 1906 | if (rv) |
ca4b2a01 | 1907 | goto out_cleanup_zone; |
a514379b MB |
1908 | |
1909 | mutex_lock(&lock); | |
1910 | list_add_tail(&nullb->list, &nullb_list); | |
1911 | mutex_unlock(&lock); | |
3681c85d | 1912 | |
f2298c04 | 1913 | return 0; |
ca4b2a01 | 1914 | out_cleanup_zone: |
d205bde7 | 1915 | null_free_zoned_dev(dev); |
132226b3 CH |
1916 | out_cleanup_disk: |
1917 | blk_cleanup_disk(nullb->disk); | |
24d2f903 | 1918 | out_cleanup_tags: |
2984c868 | 1919 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1920 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1921 | out_cleanup_queues: |
1922 | cleanup_queues(nullb); | |
1923 | out_free_nullb: | |
1924 | kfree(nullb); | |
2004bfde | 1925 | dev->nullb = NULL; |
24d2f903 | 1926 | out: |
dc501dc0 | 1927 | return rv; |
f2298c04 JA |
1928 | } |
1929 | ||
1930 | static int __init null_init(void) | |
1931 | { | |
af096e22 | 1932 | int ret = 0; |
f2298c04 | 1933 | unsigned int i; |
af096e22 | 1934 | struct nullb *nullb; |
2984c868 | 1935 | struct nullb_device *dev; |
f2298c04 | 1936 | |
2984c868 | 1937 | if (g_bs > PAGE_SIZE) { |
9c7eddf1 AA |
1938 | pr_warn("invalid block size\n"); |
1939 | pr_warn("defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1940 | g_bs = PAGE_SIZE; |
9967d8ac | 1941 | } |
f2298c04 | 1942 | |
ea17fd35 DLM |
1943 | if (g_max_sectors > BLK_DEF_MAX_SECTORS) { |
1944 | pr_warn("invalid max sectors\n"); | |
1945 | pr_warn("defaults max sectors to %u\n", BLK_DEF_MAX_SECTORS); | |
1946 | g_max_sectors = BLK_DEF_MAX_SECTORS; | |
1947 | } | |
1948 | ||
7ff684a6 | 1949 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
9c7eddf1 | 1950 | pr_err("invalid home_node value\n"); |
7ff684a6 JP |
1951 | g_home_node = NUMA_NO_NODE; |
1952 | } | |
1953 | ||
e50b1e32 | 1954 | if (g_queue_mode == NULL_Q_RQ) { |
9c7eddf1 | 1955 | pr_err("legacy IO path no longer available\n"); |
e50b1e32 JA |
1956 | return -EINVAL; |
1957 | } | |
2984c868 SL |
1958 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1959 | if (g_submit_queues != nr_online_nodes) { | |
9c7eddf1 | 1960 | pr_warn("submit_queues param is set to %u.\n", |
d15ee6b1 | 1961 | nr_online_nodes); |
2984c868 | 1962 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1963 | } |
2984c868 SL |
1964 | } else if (g_submit_queues > nr_cpu_ids) |
1965 | g_submit_queues = nr_cpu_ids; | |
1966 | else if (g_submit_queues <= 0) | |
1967 | g_submit_queues = 1; | |
f2298c04 | 1968 | |
2984c868 SL |
1969 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1970 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1971 | if (ret) |
1972 | return ret; | |
1973 | } | |
1974 | ||
3bf2bd20 SL |
1975 | config_group_init(&nullb_subsys.su_group); |
1976 | mutex_init(&nullb_subsys.su_mutex); | |
1977 | ||
1978 | ret = configfs_register_subsystem(&nullb_subsys); | |
1979 | if (ret) | |
1980 | goto err_tagset; | |
1981 | ||
f2298c04 JA |
1982 | mutex_init(&lock); |
1983 | ||
f2298c04 | 1984 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1985 | if (null_major < 0) { |
1986 | ret = null_major; | |
3bf2bd20 | 1987 | goto err_conf; |
db2d153d | 1988 | } |
f2298c04 JA |
1989 | |
1990 | for (i = 0; i < nr_devices; i++) { | |
2984c868 | 1991 | dev = null_alloc_dev(); |
30c516d7 WY |
1992 | if (!dev) { |
1993 | ret = -ENOMEM; | |
2984c868 | 1994 | goto err_dev; |
30c516d7 | 1995 | } |
2984c868 SL |
1996 | ret = null_add_dev(dev); |
1997 | if (ret) { | |
1998 | null_free_dev(dev); | |
af096e22 | 1999 | goto err_dev; |
2984c868 | 2000 | } |
f2298c04 JA |
2001 | } |
2002 | ||
9c7eddf1 | 2003 | pr_info("module loaded\n"); |
f2298c04 | 2004 | return 0; |
af096e22 MH |
2005 | |
2006 | err_dev: | |
2007 | while (!list_empty(&nullb_list)) { | |
2008 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 2009 | dev = nullb->dev; |
af096e22 | 2010 | null_del_dev(nullb); |
2984c868 | 2011 | null_free_dev(dev); |
af096e22 | 2012 | } |
af096e22 | 2013 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
2014 | err_conf: |
2015 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 2016 | err_tagset: |
2984c868 | 2017 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 2018 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 2019 | return ret; |
f2298c04 JA |
2020 | } |
2021 | ||
2022 | static void __exit null_exit(void) | |
2023 | { | |
2024 | struct nullb *nullb; | |
2025 | ||
3bf2bd20 SL |
2026 | configfs_unregister_subsystem(&nullb_subsys); |
2027 | ||
f2298c04 JA |
2028 | unregister_blkdev(null_major, "nullb"); |
2029 | ||
2030 | mutex_lock(&lock); | |
2031 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
2032 | struct nullb_device *dev; |
2033 | ||
f2298c04 | 2034 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 2035 | dev = nullb->dev; |
f2298c04 | 2036 | null_del_dev(nullb); |
2984c868 | 2037 | null_free_dev(dev); |
f2298c04 JA |
2038 | } |
2039 | mutex_unlock(&lock); | |
6bb9535b | 2040 | |
2984c868 | 2041 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe | 2042 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
2043 | } |
2044 | ||
2045 | module_init(null_init); | |
2046 | module_exit(null_exit); | |
2047 | ||
231b3db1 | 2048 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 2049 | MODULE_LICENSE("GPL"); |