Commit | Line | Data |
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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 | |
db060f54 DLM |
14 | #undef pr_fmt |
15 | #define pr_fmt(fmt) "null_blk: " fmt | |
16 | ||
5bcd0e0c SL |
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); |
596444e7 | 25 | static DECLARE_FAULT_ATTR(null_init_hctx_attr); |
33f782c4 | 26 | #endif |
93b57046 | 27 | |
eff2c4f1 SL |
28 | static inline u64 mb_per_tick(int mbps) |
29 | { | |
30 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
31 | } | |
f2298c04 | 32 | |
3bf2bd20 SL |
33 | /* |
34 | * Status flags for nullb_device. | |
35 | * | |
36 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
37 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 38 | * THROTTLED: Device is being throttled. |
deb78b41 | 39 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
40 | */ |
41 | enum nullb_device_flags { | |
42 | NULLB_DEV_FL_CONFIGURED = 0, | |
43 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 44 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 45 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
46 | }; |
47 | ||
66231ad3 | 48 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
49 | /* |
50 | * nullb_page is a page in memory for nullb devices. | |
51 | * | |
52 | * @page: The page holding the data. | |
53 | * @bitmap: The bitmap represents which sector in the page has data. | |
54 | * Each bit represents one block size. For example, sector 8 | |
55 | * will use the 7th bit | |
deb78b41 SL |
56 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
57 | * page is being flushing to storage. FREE means the cache page is freed and | |
58 | * should be skipped from flushing to storage. Please see | |
59 | * null_make_cache_space | |
5bcd0e0c SL |
60 | */ |
61 | struct nullb_page { | |
62 | struct page *page; | |
66231ad3 | 63 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 64 | }; |
66231ad3 ML |
65 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
66 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 67 | |
f2298c04 JA |
68 | static LIST_HEAD(nullb_list); |
69 | static struct mutex lock; | |
70 | static int null_major; | |
94bc02e3 | 71 | static DEFINE_IDA(nullb_indexes); |
82f402fe | 72 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 73 | |
f2298c04 JA |
74 | enum { |
75 | NULL_IRQ_NONE = 0, | |
76 | NULL_IRQ_SOFTIRQ = 1, | |
77 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 78 | }; |
f2298c04 | 79 | |
cee1b215 MG |
80 | static bool g_virt_boundary = false; |
81 | module_param_named(virt_boundary, g_virt_boundary, bool, 0444); | |
82 | MODULE_PARM_DESC(virt_boundary, "Require a virtual boundary for the device. Default: False"); | |
83 | ||
b3cffc38 | 84 | static int g_no_sched; |
5657a819 | 85 | module_param_named(no_sched, g_no_sched, int, 0444); |
b3cffc38 | 86 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
87 | ||
2984c868 | 88 | static int g_submit_queues = 1; |
5657a819 | 89 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
f2298c04 JA |
90 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
91 | ||
0a593fbb JA |
92 | static int g_poll_queues = 1; |
93 | module_param_named(poll_queues, g_poll_queues, int, 0444); | |
94 | MODULE_PARM_DESC(poll_queues, "Number of IOPOLL submission queues"); | |
95 | ||
2984c868 | 96 | static int g_home_node = NUMA_NO_NODE; |
5657a819 | 97 | module_param_named(home_node, g_home_node, int, 0444); |
f2298c04 JA |
98 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
99 | ||
33f782c4 | 100 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
290df92a DZ |
101 | /* |
102 | * For more details about fault injection, please refer to | |
103 | * Documentation/fault-injection/fault-injection.rst. | |
104 | */ | |
93b57046 | 105 | static char g_timeout_str[80]; |
5657a819 | 106 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
290df92a | 107 | MODULE_PARM_DESC(timeout, "Fault injection. timeout=<interval>,<probability>,<space>,<times>"); |
24941b90 JA |
108 | |
109 | static char g_requeue_str[80]; | |
5657a819 | 110 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
290df92a | 111 | MODULE_PARM_DESC(requeue, "Fault injection. requeue=<interval>,<probability>,<space>,<times>"); |
596444e7 BVA |
112 | |
113 | static char g_init_hctx_str[80]; | |
114 | module_param_string(init_hctx, g_init_hctx_str, sizeof(g_init_hctx_str), 0444); | |
290df92a | 115 | MODULE_PARM_DESC(init_hctx, "Fault injection to fail hctx init. init_hctx=<interval>,<probability>,<space>,<times>"); |
33f782c4 | 116 | #endif |
93b57046 | 117 | |
8b631f9c CH |
118 | /* |
119 | * Historic queue modes. | |
120 | * | |
121 | * These days nothing but NULL_Q_MQ is actually supported, but we keep it the | |
122 | * enum for error reporting. | |
123 | */ | |
124 | enum { | |
125 | NULL_Q_BIO = 0, | |
126 | NULL_Q_RQ = 1, | |
127 | NULL_Q_MQ = 2, | |
128 | }; | |
129 | ||
2984c868 | 130 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
131 | |
132 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
133 | { | |
134 | int ret, new_val; | |
135 | ||
136 | ret = kstrtoint(str, 10, &new_val); | |
137 | if (ret) | |
138 | return -EINVAL; | |
139 | ||
140 | if (new_val < min || new_val > max) | |
141 | return -EINVAL; | |
142 | ||
143 | *val = new_val; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
148 | { | |
2984c868 | 149 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
150 | } |
151 | ||
9c27847d | 152 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
153 | .set = null_set_queue_mode, |
154 | .get = param_get_int, | |
155 | }; | |
156 | ||
5657a819 | 157 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
54ae81cd | 158 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 159 | |
2984c868 | 160 | static int g_gb = 250; |
5657a819 | 161 | module_param_named(gb, g_gb, int, 0444); |
f2298c04 JA |
162 | MODULE_PARM_DESC(gb, "Size in GB"); |
163 | ||
2984c868 | 164 | static int g_bs = 512; |
5657a819 | 165 | module_param_named(bs, g_bs, int, 0444); |
f2298c04 JA |
166 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
167 | ||
ea17fd35 DLM |
168 | static int g_max_sectors; |
169 | module_param_named(max_sectors, g_max_sectors, int, 0444); | |
170 | MODULE_PARM_DESC(max_sectors, "Maximum size of a command (in 512B sectors)"); | |
171 | ||
f7c4ce89 | 172 | static unsigned int nr_devices = 1; |
701dfc42 | 173 | module_param(nr_devices, uint, 0444); |
f2298c04 JA |
174 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
175 | ||
2984c868 | 176 | static bool g_blocking; |
5657a819 | 177 | module_param_named(blocking, g_blocking, bool, 0444); |
db5bcf87 JA |
178 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
179 | ||
14509b74 SK |
180 | static bool g_shared_tags; |
181 | module_param_named(shared_tags, g_shared_tags, bool, 0444); | |
82f402fe JA |
182 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
183 | ||
0905053b JG |
184 | static bool g_shared_tag_bitmap; |
185 | module_param_named(shared_tag_bitmap, g_shared_tag_bitmap, bool, 0444); | |
186 | MODULE_PARM_DESC(shared_tag_bitmap, "Use shared tag bitmap for all submission queues for blk-mq"); | |
187 | ||
2984c868 | 188 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
189 | |
190 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
191 | { | |
2984c868 | 192 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
193 | NULL_IRQ_TIMER); |
194 | } | |
195 | ||
9c27847d | 196 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
197 | .set = null_set_irqmode, |
198 | .get = param_get_int, | |
199 | }; | |
200 | ||
5657a819 | 201 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
f2298c04 JA |
202 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
203 | ||
2984c868 | 204 | static unsigned long g_completion_nsec = 10000; |
5657a819 | 205 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
f2298c04 JA |
206 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
207 | ||
2984c868 | 208 | static int g_hw_queue_depth = 64; |
5657a819 | 209 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
f2298c04 JA |
210 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
211 | ||
2984c868 | 212 | static bool g_use_per_node_hctx; |
5657a819 | 213 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
20005244 | 214 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 215 | |
058efe00 VF |
216 | static bool g_memory_backed; |
217 | module_param_named(memory_backed, g_memory_backed, bool, 0444); | |
218 | MODULE_PARM_DESC(memory_backed, "Create a memory-backed block device. Default: false"); | |
219 | ||
220 | static bool g_discard; | |
221 | module_param_named(discard, g_discard, bool, 0444); | |
222 | MODULE_PARM_DESC(discard, "Support discard operations (requires memory-backed null_blk device). Default: false"); | |
223 | ||
224 | static unsigned long g_cache_size; | |
225 | module_param_named(cache_size, g_cache_size, ulong, 0444); | |
226 | MODULE_PARM_DESC(mbps, "Cache size in MiB for memory-backed device. Default: 0 (none)"); | |
227 | ||
228 | static unsigned int g_mbps; | |
229 | module_param_named(mbps, g_mbps, uint, 0444); | |
230 | MODULE_PARM_DESC(mbps, "Limit maximum bandwidth (in MiB/s). Default: 0 (no limit)"); | |
231 | ||
ca4b2a01 MB |
232 | static bool g_zoned; |
233 | module_param_named(zoned, g_zoned, bool, S_IRUGO); | |
234 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); | |
235 | ||
236 | static unsigned long g_zone_size = 256; | |
237 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); | |
238 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); | |
239 | ||
089565fb AR |
240 | static unsigned long g_zone_capacity; |
241 | module_param_named(zone_capacity, g_zone_capacity, ulong, 0444); | |
242 | 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"); | |
243 | ||
ea2c18e1 MS |
244 | static unsigned int g_zone_nr_conv; |
245 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); | |
246 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); | |
247 | ||
dc4d137e NC |
248 | static unsigned int g_zone_max_open; |
249 | module_param_named(zone_max_open, g_zone_max_open, uint, 0444); | |
250 | MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones when block device is zoned. Default: 0 (no limit)"); | |
251 | ||
252 | static unsigned int g_zone_max_active; | |
253 | module_param_named(zone_max_active, g_zone_max_active, uint, 0444); | |
254 | MODULE_PARM_DESC(zone_max_active, "Maximum number of active zones when block device is zoned. Default: 0 (no limit)"); | |
255 | ||
3bf2bd20 SL |
256 | static struct nullb_device *null_alloc_dev(void); |
257 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
258 | static void null_del_dev(struct nullb *nullb); |
259 | static int null_add_dev(struct nullb_device *dev); | |
49c3b926 | 260 | static struct nullb *null_find_dev_by_name(const char *name); |
deb78b41 | 261 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
262 | |
263 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
264 | { | |
bb4c19e0 | 265 | return item ? container_of(to_config_group(item), struct nullb_device, group) : NULL; |
3bf2bd20 SL |
266 | } |
267 | ||
268 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
269 | { | |
270 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
271 | } | |
272 | ||
273 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
274 | char *page) | |
275 | { | |
276 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
277 | } | |
278 | ||
279 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
280 | { | |
281 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
282 | } | |
283 | ||
284 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
285 | const char *page, size_t count) | |
286 | { | |
287 | unsigned int tmp; | |
288 | int result; | |
289 | ||
290 | result = kstrtouint(page, 0, &tmp); | |
45919fbf | 291 | if (result < 0) |
3bf2bd20 SL |
292 | return result; |
293 | ||
294 | *val = tmp; | |
295 | return count; | |
296 | } | |
297 | ||
298 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
299 | const char *page, size_t count) | |
300 | { | |
301 | int result; | |
302 | unsigned long tmp; | |
303 | ||
304 | result = kstrtoul(page, 0, &tmp); | |
45919fbf | 305 | if (result < 0) |
3bf2bd20 SL |
306 | return result; |
307 | ||
308 | *val = tmp; | |
309 | return count; | |
310 | } | |
311 | ||
312 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
313 | size_t count) | |
314 | { | |
315 | bool tmp; | |
316 | int result; | |
317 | ||
318 | result = kstrtobool(page, &tmp); | |
45919fbf | 319 | if (result < 0) |
3bf2bd20 SL |
320 | return result; |
321 | ||
322 | *val = tmp; | |
323 | return count; | |
324 | } | |
325 | ||
326 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
ca0a95a6 AM |
327 | #define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \ |
328 | static ssize_t \ | |
329 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
330 | { \ | |
331 | return nullb_device_##TYPE##_attr_show( \ | |
332 | to_nullb_device(item)->NAME, page); \ | |
333 | } \ | |
334 | static ssize_t \ | |
335 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
336 | size_t count) \ | |
337 | { \ | |
338 | int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ | |
339 | struct nullb_device *dev = to_nullb_device(item); \ | |
b9853b4d | 340 | TYPE new_value = 0; \ |
ca0a95a6 AM |
341 | int ret; \ |
342 | \ | |
343 | ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ | |
344 | if (ret < 0) \ | |
345 | return ret; \ | |
346 | if (apply_fn) \ | |
347 | ret = apply_fn(dev, new_value); \ | |
348 | else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \ | |
349 | ret = -EBUSY; \ | |
350 | if (ret < 0) \ | |
351 | return ret; \ | |
352 | dev->NAME = new_value; \ | |
353 | return count; \ | |
354 | } \ | |
3bf2bd20 SL |
355 | CONFIGFS_ATTR(nullb_device_, NAME); |
356 | ||
15dfc662 SK |
357 | static int nullb_update_nr_hw_queues(struct nullb_device *dev, |
358 | unsigned int submit_queues, | |
359 | unsigned int poll_queues) | |
360 | ||
45919fbf | 361 | { |
45919fbf | 362 | struct blk_mq_tag_set *set; |
15dfc662 | 363 | int ret, nr_hw_queues; |
45919fbf | 364 | |
15dfc662 | 365 | if (!dev->nullb) |
45919fbf BVA |
366 | return 0; |
367 | ||
15dfc662 | 368 | /* |
2bfdbe8b | 369 | * Make sure at least one submit queue exists. |
15dfc662 | 370 | */ |
2bfdbe8b | 371 | if (!submit_queues) |
15dfc662 SK |
372 | return -EINVAL; |
373 | ||
78b10be2 BVA |
374 | /* |
375 | * Make sure that null_init_hctx() does not access nullb->queues[] past | |
376 | * the end of that array. | |
377 | */ | |
15dfc662 | 378 | if (submit_queues > nr_cpu_ids || poll_queues > g_poll_queues) |
78b10be2 | 379 | return -EINVAL; |
15dfc662 SK |
380 | |
381 | /* | |
382 | * Keep previous and new queue numbers in nullb_device for reference in | |
383 | * the call back function null_map_queues(). | |
384 | */ | |
385 | dev->prev_submit_queues = dev->submit_queues; | |
386 | dev->prev_poll_queues = dev->poll_queues; | |
387 | dev->submit_queues = submit_queues; | |
388 | dev->poll_queues = poll_queues; | |
389 | ||
390 | set = dev->nullb->tag_set; | |
391 | nr_hw_queues = submit_queues + poll_queues; | |
392 | blk_mq_update_nr_hw_queues(set, nr_hw_queues); | |
393 | ret = set->nr_hw_queues == nr_hw_queues ? 0 : -ENOMEM; | |
394 | ||
395 | if (ret) { | |
396 | /* on error, revert the queue numbers */ | |
397 | dev->submit_queues = dev->prev_submit_queues; | |
398 | dev->poll_queues = dev->prev_poll_queues; | |
399 | } | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
404 | static int nullb_apply_submit_queues(struct nullb_device *dev, | |
405 | unsigned int submit_queues) | |
406 | { | |
407 | return nullb_update_nr_hw_queues(dev, submit_queues, dev->poll_queues); | |
408 | } | |
409 | ||
410 | static int nullb_apply_poll_queues(struct nullb_device *dev, | |
411 | unsigned int poll_queues) | |
412 | { | |
413 | return nullb_update_nr_hw_queues(dev, dev->submit_queues, poll_queues); | |
45919fbf BVA |
414 | } |
415 | ||
416 | NULLB_DEVICE_ATTR(size, ulong, NULL); | |
417 | NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL); | |
418 | NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues); | |
15dfc662 | 419 | NULLB_DEVICE_ATTR(poll_queues, uint, nullb_apply_poll_queues); |
45919fbf BVA |
420 | NULLB_DEVICE_ATTR(home_node, uint, NULL); |
421 | NULLB_DEVICE_ATTR(queue_mode, uint, NULL); | |
422 | NULLB_DEVICE_ATTR(blocksize, uint, NULL); | |
ea17fd35 | 423 | NULLB_DEVICE_ATTR(max_sectors, uint, NULL); |
45919fbf BVA |
424 | NULLB_DEVICE_ATTR(irqmode, uint, NULL); |
425 | NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); | |
426 | NULLB_DEVICE_ATTR(index, uint, NULL); | |
427 | NULLB_DEVICE_ATTR(blocking, bool, NULL); | |
428 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL); | |
429 | NULLB_DEVICE_ATTR(memory_backed, bool, NULL); | |
430 | NULLB_DEVICE_ATTR(discard, bool, NULL); | |
431 | NULLB_DEVICE_ATTR(mbps, uint, NULL); | |
432 | NULLB_DEVICE_ATTR(cache_size, ulong, NULL); | |
433 | NULLB_DEVICE_ATTR(zoned, bool, NULL); | |
434 | NULLB_DEVICE_ATTR(zone_size, ulong, NULL); | |
089565fb | 435 | NULLB_DEVICE_ATTR(zone_capacity, ulong, NULL); |
45919fbf | 436 | NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL); |
dc4d137e NC |
437 | NULLB_DEVICE_ATTR(zone_max_open, uint, NULL); |
438 | NULLB_DEVICE_ATTR(zone_max_active, uint, NULL); | |
cee1b215 | 439 | NULLB_DEVICE_ATTR(virt_boundary, bool, NULL); |
7012eef5 | 440 | NULLB_DEVICE_ATTR(no_sched, bool, NULL); |
14509b74 | 441 | NULLB_DEVICE_ATTR(shared_tags, bool, NULL); |
7012eef5 | 442 | NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL); |
3bf2bd20 | 443 | |
cedcafad SL |
444 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
445 | { | |
446 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
447 | } | |
448 | ||
449 | static ssize_t nullb_device_power_store(struct config_item *item, | |
450 | const char *page, size_t count) | |
451 | { | |
452 | struct nullb_device *dev = to_nullb_device(item); | |
453 | bool newp = false; | |
454 | ssize_t ret; | |
455 | ||
456 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
457 | if (ret < 0) | |
458 | return ret; | |
459 | ||
460 | if (!dev->power && newp) { | |
461 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
462 | return count; | |
a75110c3 CK |
463 | ret = null_add_dev(dev); |
464 | if (ret) { | |
cedcafad | 465 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); |
a75110c3 | 466 | return ret; |
cedcafad SL |
467 | } |
468 | ||
469 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
470 | dev->power = newp; | |
b3c30512 | 471 | } else if (dev->power && !newp) { |
7602843f BL |
472 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
473 | mutex_lock(&lock); | |
474 | dev->power = newp; | |
475 | null_del_dev(dev->nullb); | |
476 | mutex_unlock(&lock); | |
477 | } | |
00a8cdb8 | 478 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
479 | } |
480 | ||
481 | return count; | |
482 | } | |
483 | ||
484 | CONFIGFS_ATTR(nullb_device_, power); | |
485 | ||
2f54a613 SL |
486 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
487 | { | |
488 | struct nullb_device *t_dev = to_nullb_device(item); | |
489 | ||
490 | return badblocks_show(&t_dev->badblocks, page, 0); | |
491 | } | |
492 | ||
493 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
494 | const char *page, size_t count) | |
495 | { | |
496 | struct nullb_device *t_dev = to_nullb_device(item); | |
497 | char *orig, *buf, *tmp; | |
498 | u64 start, end; | |
499 | int ret; | |
500 | ||
501 | orig = kstrndup(page, count, GFP_KERNEL); | |
502 | if (!orig) | |
503 | return -ENOMEM; | |
504 | ||
505 | buf = strstrip(orig); | |
506 | ||
507 | ret = -EINVAL; | |
508 | if (buf[0] != '+' && buf[0] != '-') | |
509 | goto out; | |
510 | tmp = strchr(&buf[1], '-'); | |
511 | if (!tmp) | |
512 | goto out; | |
513 | *tmp = '\0'; | |
514 | ret = kstrtoull(buf + 1, 0, &start); | |
515 | if (ret) | |
516 | goto out; | |
517 | ret = kstrtoull(tmp + 1, 0, &end); | |
518 | if (ret) | |
519 | goto out; | |
520 | ret = -EINVAL; | |
521 | if (start > end) | |
522 | goto out; | |
523 | /* enable badblocks */ | |
524 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
525 | if (buf[0] == '+') | |
526 | ret = badblocks_set(&t_dev->badblocks, start, | |
527 | end - start + 1, 1); | |
528 | else | |
529 | ret = badblocks_clear(&t_dev->badblocks, start, | |
530 | end - start + 1); | |
531 | if (ret == 0) | |
532 | ret = count; | |
533 | out: | |
534 | kfree(orig); | |
535 | return ret; | |
536 | } | |
537 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
538 | ||
d3a57388 SK |
539 | static ssize_t nullb_device_zone_readonly_store(struct config_item *item, |
540 | const char *page, size_t count) | |
541 | { | |
542 | struct nullb_device *dev = to_nullb_device(item); | |
543 | ||
544 | return zone_cond_store(dev, page, count, BLK_ZONE_COND_READONLY); | |
545 | } | |
546 | CONFIGFS_ATTR_WO(nullb_device_, zone_readonly); | |
547 | ||
548 | static ssize_t nullb_device_zone_offline_store(struct config_item *item, | |
549 | const char *page, size_t count) | |
550 | { | |
551 | struct nullb_device *dev = to_nullb_device(item); | |
552 | ||
553 | return zone_cond_store(dev, page, count, BLK_ZONE_COND_OFFLINE); | |
554 | } | |
555 | CONFIGFS_ATTR_WO(nullb_device_, zone_offline); | |
556 | ||
3bf2bd20 SL |
557 | static struct configfs_attribute *nullb_device_attrs[] = { |
558 | &nullb_device_attr_size, | |
559 | &nullb_device_attr_completion_nsec, | |
560 | &nullb_device_attr_submit_queues, | |
0a593fbb | 561 | &nullb_device_attr_poll_queues, |
3bf2bd20 SL |
562 | &nullb_device_attr_home_node, |
563 | &nullb_device_attr_queue_mode, | |
564 | &nullb_device_attr_blocksize, | |
ea17fd35 | 565 | &nullb_device_attr_max_sectors, |
3bf2bd20 SL |
566 | &nullb_device_attr_irqmode, |
567 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 568 | &nullb_device_attr_index, |
3bf2bd20 SL |
569 | &nullb_device_attr_blocking, |
570 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 571 | &nullb_device_attr_power, |
5bcd0e0c | 572 | &nullb_device_attr_memory_backed, |
306eb6b4 | 573 | &nullb_device_attr_discard, |
eff2c4f1 | 574 | &nullb_device_attr_mbps, |
deb78b41 | 575 | &nullb_device_attr_cache_size, |
2f54a613 | 576 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
577 | &nullb_device_attr_zoned, |
578 | &nullb_device_attr_zone_size, | |
089565fb | 579 | &nullb_device_attr_zone_capacity, |
ea2c18e1 | 580 | &nullb_device_attr_zone_nr_conv, |
dc4d137e NC |
581 | &nullb_device_attr_zone_max_open, |
582 | &nullb_device_attr_zone_max_active, | |
d3a57388 SK |
583 | &nullb_device_attr_zone_readonly, |
584 | &nullb_device_attr_zone_offline, | |
cee1b215 | 585 | &nullb_device_attr_virt_boundary, |
7012eef5 | 586 | &nullb_device_attr_no_sched, |
14509b74 | 587 | &nullb_device_attr_shared_tags, |
7012eef5 | 588 | &nullb_device_attr_shared_tag_bitmap, |
3bf2bd20 SL |
589 | NULL, |
590 | }; | |
591 | ||
592 | static void nullb_device_release(struct config_item *item) | |
593 | { | |
5bcd0e0c SL |
594 | struct nullb_device *dev = to_nullb_device(item); |
595 | ||
deb78b41 | 596 | null_free_device_storage(dev, false); |
5bcd0e0c | 597 | null_free_dev(dev); |
3bf2bd20 SL |
598 | } |
599 | ||
600 | static struct configfs_item_operations nullb_device_ops = { | |
601 | .release = nullb_device_release, | |
602 | }; | |
603 | ||
e1919dff | 604 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
605 | .ct_item_ops = &nullb_device_ops, |
606 | .ct_attrs = nullb_device_attrs, | |
607 | .ct_owner = THIS_MODULE, | |
608 | }; | |
609 | ||
bb4c19e0 AM |
610 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
611 | ||
612 | static void nullb_add_fault_config(struct nullb_device *dev) | |
613 | { | |
614 | fault_config_init(&dev->timeout_config, "timeout_inject"); | |
615 | fault_config_init(&dev->requeue_config, "requeue_inject"); | |
616 | fault_config_init(&dev->init_hctx_fault_config, "init_hctx_fault_inject"); | |
617 | ||
618 | configfs_add_default_group(&dev->timeout_config.group, &dev->group); | |
619 | configfs_add_default_group(&dev->requeue_config.group, &dev->group); | |
620 | configfs_add_default_group(&dev->init_hctx_fault_config.group, &dev->group); | |
621 | } | |
622 | ||
623 | #else | |
624 | ||
625 | static void nullb_add_fault_config(struct nullb_device *dev) | |
626 | { | |
627 | } | |
628 | ||
629 | #endif | |
630 | ||
3bf2bd20 | 631 | static struct |
bb4c19e0 | 632 | config_group *nullb_group_make_group(struct config_group *group, const char *name) |
3bf2bd20 SL |
633 | { |
634 | struct nullb_device *dev; | |
635 | ||
49c3b926 DLM |
636 | if (null_find_dev_by_name(name)) |
637 | return ERR_PTR(-EEXIST); | |
638 | ||
3bf2bd20 SL |
639 | dev = null_alloc_dev(); |
640 | if (!dev) | |
641 | return ERR_PTR(-ENOMEM); | |
642 | ||
bb4c19e0 AM |
643 | config_group_init_type_name(&dev->group, name, &nullb_device_type); |
644 | nullb_add_fault_config(dev); | |
3bf2bd20 | 645 | |
bb4c19e0 | 646 | return &dev->group; |
3bf2bd20 SL |
647 | } |
648 | ||
649 | static void | |
650 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
651 | { | |
cedcafad SL |
652 | struct nullb_device *dev = to_nullb_device(item); |
653 | ||
654 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
655 | mutex_lock(&lock); | |
656 | dev->power = false; | |
657 | null_del_dev(dev->nullb); | |
658 | mutex_unlock(&lock); | |
659 | } | |
660 | ||
3bf2bd20 SL |
661 | config_item_put(item); |
662 | } | |
663 | ||
664 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
665 | { | |
089565fb | 666 | return snprintf(page, PAGE_SIZE, |
7012eef5 VF |
667 | "badblocks,blocking,blocksize,cache_size," |
668 | "completion_nsec,discard,home_node,hw_queue_depth," | |
669 | "irqmode,max_sectors,mbps,memory_backed,no_sched," | |
14509b74 SK |
670 | "poll_queues,power,queue_mode,shared_tag_bitmap," |
671 | "shared_tags,size,submit_queues,use_per_node_hctx," | |
672 | "virt_boundary,zoned,zone_capacity,zone_max_active," | |
673 | "zone_max_open,zone_nr_conv,zone_offline,zone_readonly," | |
674 | "zone_size\n"); | |
3bf2bd20 SL |
675 | } |
676 | ||
677 | CONFIGFS_ATTR_RO(memb_group_, features); | |
678 | ||
679 | static struct configfs_attribute *nullb_group_attrs[] = { | |
680 | &memb_group_attr_features, | |
681 | NULL, | |
682 | }; | |
683 | ||
684 | static struct configfs_group_operations nullb_group_ops = { | |
bb4c19e0 | 685 | .make_group = nullb_group_make_group, |
3bf2bd20 SL |
686 | .drop_item = nullb_group_drop_item, |
687 | }; | |
688 | ||
e1919dff | 689 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
690 | .ct_group_ops = &nullb_group_ops, |
691 | .ct_attrs = nullb_group_attrs, | |
692 | .ct_owner = THIS_MODULE, | |
693 | }; | |
694 | ||
695 | static struct configfs_subsystem nullb_subsys = { | |
696 | .su_group = { | |
697 | .cg_item = { | |
698 | .ci_namebuf = "nullb", | |
699 | .ci_type = &nullb_group_type, | |
700 | }, | |
701 | }, | |
702 | }; | |
703 | ||
deb78b41 SL |
704 | static inline int null_cache_active(struct nullb *nullb) |
705 | { | |
706 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
707 | } | |
708 | ||
2984c868 SL |
709 | static struct nullb_device *null_alloc_dev(void) |
710 | { | |
711 | struct nullb_device *dev; | |
712 | ||
713 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
714 | if (!dev) | |
715 | return NULL; | |
bb4c19e0 AM |
716 | |
717 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
718 | dev->timeout_config.attr = null_timeout_attr; | |
719 | dev->requeue_config.attr = null_requeue_attr; | |
720 | dev->init_hctx_fault_config.attr = null_init_hctx_attr; | |
721 | #endif | |
722 | ||
5bcd0e0c | 723 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 724 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
725 | if (badblocks_init(&dev->badblocks, 0)) { |
726 | kfree(dev); | |
727 | return NULL; | |
728 | } | |
729 | ||
2984c868 SL |
730 | dev->size = g_gb * 1024; |
731 | dev->completion_nsec = g_completion_nsec; | |
732 | dev->submit_queues = g_submit_queues; | |
15dfc662 | 733 | dev->prev_submit_queues = g_submit_queues; |
0a593fbb | 734 | dev->poll_queues = g_poll_queues; |
15dfc662 | 735 | dev->prev_poll_queues = g_poll_queues; |
2984c868 SL |
736 | dev->home_node = g_home_node; |
737 | dev->queue_mode = g_queue_mode; | |
738 | dev->blocksize = g_bs; | |
ea17fd35 | 739 | dev->max_sectors = g_max_sectors; |
2984c868 SL |
740 | dev->irqmode = g_irqmode; |
741 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 | 742 | dev->blocking = g_blocking; |
058efe00 VF |
743 | dev->memory_backed = g_memory_backed; |
744 | dev->discard = g_discard; | |
745 | dev->cache_size = g_cache_size; | |
746 | dev->mbps = g_mbps; | |
2984c868 | 747 | dev->use_per_node_hctx = g_use_per_node_hctx; |
ca4b2a01 MB |
748 | dev->zoned = g_zoned; |
749 | dev->zone_size = g_zone_size; | |
089565fb | 750 | dev->zone_capacity = g_zone_capacity; |
ea2c18e1 | 751 | dev->zone_nr_conv = g_zone_nr_conv; |
dc4d137e NC |
752 | dev->zone_max_open = g_zone_max_open; |
753 | dev->zone_max_active = g_zone_max_active; | |
cee1b215 | 754 | dev->virt_boundary = g_virt_boundary; |
7012eef5 | 755 | dev->no_sched = g_no_sched; |
14509b74 | 756 | dev->shared_tags = g_shared_tags; |
7012eef5 | 757 | dev->shared_tag_bitmap = g_shared_tag_bitmap; |
2984c868 SL |
758 | return dev; |
759 | } | |
760 | ||
761 | static void null_free_dev(struct nullb_device *dev) | |
762 | { | |
1addb798 DD |
763 | if (!dev) |
764 | return; | |
765 | ||
d205bde7 | 766 | null_free_zoned_dev(dev); |
1addb798 | 767 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
768 | kfree(dev); |
769 | } | |
770 | ||
cf8ecc5a AA |
771 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) |
772 | { | |
8b631f9c | 773 | struct nullb_cmd *cmd = container_of(timer, struct nullb_cmd, timer); |
f2298c04 | 774 | |
8b631f9c | 775 | blk_mq_end_request(blk_mq_rq_from_pdu(cmd), cmd->error); |
f2298c04 JA |
776 | return HRTIMER_NORESTART; |
777 | } | |
778 | ||
779 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
780 | { | |
2984c868 | 781 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 782 | |
3c395a96 | 783 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
784 | } |
785 | ||
49f66136 | 786 | static void null_complete_rq(struct request *rq) |
f2298c04 | 787 | { |
8b631f9c CH |
788 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); |
789 | ||
790 | blk_mq_end_request(rq, cmd->error); | |
f2298c04 JA |
791 | } |
792 | ||
c90b6b50 | 793 | static struct nullb_page *null_alloc_page(void) |
5bcd0e0c SL |
794 | { |
795 | struct nullb_page *t_page; | |
796 | ||
c90b6b50 | 797 | t_page = kmalloc(sizeof(struct nullb_page), GFP_NOIO); |
5bcd0e0c | 798 | if (!t_page) |
df00b1d2 | 799 | return NULL; |
5bcd0e0c | 800 | |
c90b6b50 | 801 | t_page->page = alloc_pages(GFP_NOIO, 0); |
df00b1d2 CK |
802 | if (!t_page->page) { |
803 | kfree(t_page); | |
804 | return NULL; | |
805 | } | |
5bcd0e0c | 806 | |
66231ad3 | 807 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c | 808 | return t_page; |
5bcd0e0c SL |
809 | } |
810 | ||
811 | static void null_free_page(struct nullb_page *t_page) | |
812 | { | |
66231ad3 ML |
813 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
814 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 815 | return; |
5bcd0e0c SL |
816 | __free_page(t_page->page); |
817 | kfree(t_page); | |
818 | } | |
819 | ||
66231ad3 ML |
820 | static bool null_page_empty(struct nullb_page *page) |
821 | { | |
822 | int size = MAP_SZ - 2; | |
823 | ||
824 | return find_first_bit(page->bitmap, size) == size; | |
825 | } | |
826 | ||
deb78b41 SL |
827 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
828 | bool is_cache) | |
5bcd0e0c SL |
829 | { |
830 | unsigned int sector_bit; | |
831 | u64 idx; | |
832 | struct nullb_page *t_page, *ret; | |
833 | struct radix_tree_root *root; | |
834 | ||
deb78b41 | 835 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
836 | idx = sector >> PAGE_SECTORS_SHIFT; |
837 | sector_bit = (sector & SECTOR_MASK); | |
838 | ||
839 | t_page = radix_tree_lookup(root, idx); | |
840 | if (t_page) { | |
66231ad3 | 841 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 842 | |
66231ad3 | 843 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
844 | ret = radix_tree_delete_item(root, idx, t_page); |
845 | WARN_ON(ret != t_page); | |
846 | null_free_page(ret); | |
deb78b41 SL |
847 | if (is_cache) |
848 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
849 | } |
850 | } | |
851 | } | |
852 | ||
853 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 854 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
855 | { |
856 | struct radix_tree_root *root; | |
857 | ||
deb78b41 | 858 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
859 | |
860 | if (radix_tree_insert(root, idx, t_page)) { | |
861 | null_free_page(t_page); | |
862 | t_page = radix_tree_lookup(root, idx); | |
863 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
864 | } else if (is_cache) |
865 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
866 | |
867 | return t_page; | |
868 | } | |
869 | ||
deb78b41 | 870 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
871 | { |
872 | unsigned long pos = 0; | |
873 | int nr_pages; | |
874 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
875 | struct radix_tree_root *root; | |
876 | ||
deb78b41 | 877 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
878 | |
879 | do { | |
880 | int i; | |
881 | ||
882 | nr_pages = radix_tree_gang_lookup(root, | |
883 | (void **)t_pages, pos, FREE_BATCH); | |
884 | ||
885 | for (i = 0; i < nr_pages; i++) { | |
886 | pos = t_pages[i]->page->index; | |
887 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
888 | WARN_ON(ret != t_pages[i]); | |
889 | null_free_page(ret); | |
890 | } | |
891 | ||
892 | pos++; | |
893 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
894 | |
895 | if (is_cache) | |
896 | dev->curr_cache = 0; | |
5bcd0e0c SL |
897 | } |
898 | ||
deb78b41 SL |
899 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
900 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
901 | { |
902 | unsigned int sector_bit; | |
903 | u64 idx; | |
904 | struct nullb_page *t_page; | |
deb78b41 | 905 | struct radix_tree_root *root; |
5bcd0e0c SL |
906 | |
907 | idx = sector >> PAGE_SECTORS_SHIFT; | |
908 | sector_bit = (sector & SECTOR_MASK); | |
909 | ||
deb78b41 SL |
910 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
911 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
912 | WARN_ON(t_page && t_page->page->index != idx); |
913 | ||
66231ad3 | 914 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
915 | return t_page; |
916 | ||
917 | return NULL; | |
918 | } | |
919 | ||
deb78b41 SL |
920 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
921 | sector_t sector, bool for_write, bool ignore_cache) | |
922 | { | |
923 | struct nullb_page *page = NULL; | |
924 | ||
925 | if (!ignore_cache) | |
926 | page = __null_lookup_page(nullb, sector, for_write, true); | |
927 | if (page) | |
928 | return page; | |
929 | return __null_lookup_page(nullb, sector, for_write, false); | |
930 | } | |
931 | ||
5bcd0e0c | 932 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
933 | sector_t sector, bool ignore_cache) |
934 | __releases(&nullb->lock) | |
935 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
936 | { |
937 | u64 idx; | |
938 | struct nullb_page *t_page; | |
939 | ||
deb78b41 | 940 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
941 | if (t_page) |
942 | return t_page; | |
943 | ||
944 | spin_unlock_irq(&nullb->lock); | |
945 | ||
c90b6b50 | 946 | t_page = null_alloc_page(); |
5bcd0e0c SL |
947 | if (!t_page) |
948 | goto out_lock; | |
949 | ||
950 | if (radix_tree_preload(GFP_NOIO)) | |
951 | goto out_freepage; | |
952 | ||
953 | spin_lock_irq(&nullb->lock); | |
954 | idx = sector >> PAGE_SECTORS_SHIFT; | |
955 | t_page->page->index = idx; | |
deb78b41 | 956 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
957 | radix_tree_preload_end(); |
958 | ||
959 | return t_page; | |
960 | out_freepage: | |
961 | null_free_page(t_page); | |
962 | out_lock: | |
963 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
964 | return null_lookup_page(nullb, sector, true, ignore_cache); |
965 | } | |
966 | ||
967 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
968 | { | |
969 | int i; | |
970 | unsigned int offset; | |
971 | u64 idx; | |
972 | struct nullb_page *t_page, *ret; | |
973 | void *dst, *src; | |
974 | ||
975 | idx = c_page->page->index; | |
976 | ||
977 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
978 | ||
66231ad3 ML |
979 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
980 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 981 | null_free_page(c_page); |
66231ad3 | 982 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
983 | ret = radix_tree_delete_item(&nullb->dev->data, |
984 | idx, t_page); | |
985 | null_free_page(t_page); | |
986 | } | |
987 | return 0; | |
988 | } | |
989 | ||
990 | if (!t_page) | |
991 | return -ENOMEM; | |
992 | ||
acc3c879 CK |
993 | src = kmap_local_page(c_page->page); |
994 | dst = kmap_local_page(t_page->page); | |
deb78b41 SL |
995 | |
996 | for (i = 0; i < PAGE_SECTORS; | |
997 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 998 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
999 | offset = (i << SECTOR_SHIFT); |
1000 | memcpy(dst + offset, src + offset, | |
1001 | nullb->dev->blocksize); | |
66231ad3 | 1002 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
1003 | } |
1004 | } | |
1005 | ||
acc3c879 CK |
1006 | kunmap_local(dst); |
1007 | kunmap_local(src); | |
deb78b41 SL |
1008 | |
1009 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
1010 | null_free_page(ret); | |
1011 | nullb->dev->curr_cache -= PAGE_SIZE; | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 1017 | { |
deb78b41 SL |
1018 | int i, err, nr_pages; |
1019 | struct nullb_page *c_pages[FREE_BATCH]; | |
1020 | unsigned long flushed = 0, one_round; | |
1021 | ||
1022 | again: | |
1023 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
1024 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
1025 | return 0; | |
1026 | ||
1027 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
1028 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
1029 | /* | |
1030 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
1031 | * avoid race, we don't allow page free | |
1032 | */ | |
1033 | for (i = 0; i < nr_pages; i++) { | |
1034 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
1035 | /* | |
1036 | * We found the page which is being flushed to disk by other | |
1037 | * threads | |
1038 | */ | |
66231ad3 | 1039 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
1040 | c_pages[i] = NULL; |
1041 | else | |
66231ad3 | 1042 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
1043 | } |
1044 | ||
1045 | one_round = 0; | |
1046 | for (i = 0; i < nr_pages; i++) { | |
1047 | if (c_pages[i] == NULL) | |
1048 | continue; | |
1049 | err = null_flush_cache_page(nullb, c_pages[i]); | |
1050 | if (err) | |
1051 | return err; | |
1052 | one_round++; | |
1053 | } | |
1054 | flushed += one_round << PAGE_SHIFT; | |
1055 | ||
1056 | if (n > flushed) { | |
1057 | if (nr_pages == 0) | |
1058 | nullb->cache_flush_pos = 0; | |
1059 | if (one_round == 0) { | |
1060 | /* give other threads a chance */ | |
1061 | spin_unlock_irq(&nullb->lock); | |
1062 | spin_lock_irq(&nullb->lock); | |
1063 | } | |
1064 | goto again; | |
1065 | } | |
1066 | return 0; | |
5bcd0e0c SL |
1067 | } |
1068 | ||
1069 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 1070 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
1071 | { |
1072 | size_t temp, count = 0; | |
1073 | unsigned int offset; | |
1074 | struct nullb_page *t_page; | |
5bcd0e0c SL |
1075 | |
1076 | while (count < n) { | |
1077 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1078 | ||
deb78b41 SL |
1079 | if (null_cache_active(nullb) && !is_fua) |
1080 | null_make_cache_space(nullb, PAGE_SIZE); | |
1081 | ||
5bcd0e0c | 1082 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
1083 | t_page = null_insert_page(nullb, sector, |
1084 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
1085 | if (!t_page) |
1086 | return -ENOSPC; | |
1087 | ||
fbb5615f | 1088 | memcpy_page(t_page->page, offset, source, off + count, temp); |
5bcd0e0c | 1089 | |
66231ad3 | 1090 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 1091 | |
deb78b41 SL |
1092 | if (is_fua) |
1093 | null_free_sector(nullb, sector, true); | |
1094 | ||
5bcd0e0c SL |
1095 | count += temp; |
1096 | sector += temp >> SECTOR_SHIFT; | |
1097 | } | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1102 | unsigned int off, sector_t sector, size_t n) | |
1103 | { | |
1104 | size_t temp, count = 0; | |
1105 | unsigned int offset; | |
1106 | struct nullb_page *t_page; | |
5bcd0e0c SL |
1107 | |
1108 | while (count < n) { | |
1109 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1110 | ||
1111 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1112 | t_page = null_lookup_page(nullb, sector, false, |
1113 | !null_cache_active(nullb)); | |
5bcd0e0c | 1114 | |
fbb5615f CK |
1115 | if (t_page) |
1116 | memcpy_page(dest, off + count, t_page->page, offset, | |
1117 | temp); | |
1118 | else | |
1119 | zero_user(dest, off + count, temp); | |
5bcd0e0c SL |
1120 | |
1121 | count += temp; | |
1122 | sector += temp >> SECTOR_SHIFT; | |
1123 | } | |
1124 | return 0; | |
1125 | } | |
1126 | ||
dd85b492 AJ |
1127 | static void nullb_fill_pattern(struct nullb *nullb, struct page *page, |
1128 | unsigned int len, unsigned int off) | |
1129 | { | |
fbb5615f | 1130 | memset_page(page, off, 0xff, len); |
dd85b492 AJ |
1131 | } |
1132 | ||
0ec4d913 DLM |
1133 | blk_status_t null_handle_discard(struct nullb_device *dev, |
1134 | sector_t sector, sector_t nr_sectors) | |
306eb6b4 | 1135 | { |
49c7089f DLM |
1136 | struct nullb *nullb = dev->nullb; |
1137 | size_t n = nr_sectors << SECTOR_SHIFT; | |
306eb6b4 SL |
1138 | size_t temp; |
1139 | ||
1140 | spin_lock_irq(&nullb->lock); | |
1141 | while (n > 0) { | |
49c7089f | 1142 | temp = min_t(size_t, n, dev->blocksize); |
deb78b41 SL |
1143 | null_free_sector(nullb, sector, false); |
1144 | if (null_cache_active(nullb)) | |
1145 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1146 | sector += temp >> SECTOR_SHIFT; |
1147 | n -= temp; | |
1148 | } | |
1149 | spin_unlock_irq(&nullb->lock); | |
49c7089f DLM |
1150 | |
1151 | return BLK_STS_OK; | |
306eb6b4 SL |
1152 | } |
1153 | ||
deb78b41 SL |
1154 | static int null_handle_flush(struct nullb *nullb) |
1155 | { | |
1156 | int err; | |
1157 | ||
1158 | if (!null_cache_active(nullb)) | |
1159 | return 0; | |
1160 | ||
1161 | spin_lock_irq(&nullb->lock); | |
1162 | while (true) { | |
1163 | err = null_make_cache_space(nullb, | |
1164 | nullb->dev->cache_size * 1024 * 1024); | |
1165 | if (err || nullb->dev->curr_cache == 0) | |
1166 | break; | |
1167 | } | |
1168 | ||
1169 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1170 | spin_unlock_irq(&nullb->lock); | |
1171 | return err; | |
1172 | } | |
1173 | ||
5bcd0e0c | 1174 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1175 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1176 | bool is_fua) | |
f2298c04 | 1177 | { |
dd85b492 AJ |
1178 | struct nullb_device *dev = nullb->dev; |
1179 | unsigned int valid_len = len; | |
5bcd0e0c SL |
1180 | int err = 0; |
1181 | ||
1182 | if (!is_write) { | |
dd85b492 AJ |
1183 | if (dev->zoned) |
1184 | valid_len = null_zone_valid_read_len(nullb, | |
1185 | sector, len); | |
1186 | ||
1187 | if (valid_len) { | |
1188 | err = copy_from_nullb(nullb, page, off, | |
1189 | sector, valid_len); | |
1190 | off += valid_len; | |
1191 | len -= valid_len; | |
1192 | } | |
1193 | ||
1194 | if (len) | |
1195 | nullb_fill_pattern(nullb, page, len, off); | |
5bcd0e0c SL |
1196 | flush_dcache_page(page); |
1197 | } else { | |
1198 | flush_dcache_page(page); | |
deb78b41 | 1199 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1200 | } |
1201 | ||
1202 | return err; | |
1203 | } | |
1204 | ||
1205 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1206 | { | |
8b631f9c | 1207 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
5bcd0e0c SL |
1208 | struct nullb *nullb = cmd->nq->dev->nullb; |
1209 | int err; | |
1210 | unsigned int len; | |
49c7089f | 1211 | sector_t sector = blk_rq_pos(rq); |
5bcd0e0c SL |
1212 | struct req_iterator iter; |
1213 | struct bio_vec bvec; | |
1214 | ||
5bcd0e0c SL |
1215 | spin_lock_irq(&nullb->lock); |
1216 | rq_for_each_segment(bvec, rq, iter) { | |
1217 | len = bvec.bv_len; | |
1218 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1219 | op_is_write(req_op(rq)), sector, |
2d62e6b0 | 1220 | rq->cmd_flags & REQ_FUA); |
5bcd0e0c SL |
1221 | if (err) { |
1222 | spin_unlock_irq(&nullb->lock); | |
1223 | return err; | |
1224 | } | |
1225 | sector += len >> SECTOR_SHIFT; | |
1226 | } | |
1227 | spin_unlock_irq(&nullb->lock); | |
1228 | ||
1229 | return 0; | |
1230 | } | |
1231 | ||
adb84284 CK |
1232 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
1233 | { | |
1234 | struct nullb_device *dev = cmd->nq->dev; | |
1235 | struct nullb *nullb = dev->nullb; | |
1236 | blk_status_t sts = BLK_STS_OK; | |
8b631f9c | 1237 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
adb84284 CK |
1238 | |
1239 | if (!hrtimer_active(&nullb->bw_timer)) | |
1240 | hrtimer_restart(&nullb->bw_timer); | |
1241 | ||
1242 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { | |
8b631f9c | 1243 | blk_mq_stop_hw_queues(nullb->q); |
adb84284 CK |
1244 | /* race with timer */ |
1245 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
8b631f9c | 1246 | blk_mq_start_stopped_hw_queues(nullb->q, true); |
adb84284 CK |
1247 | /* requeue request */ |
1248 | sts = BLK_STS_DEV_RESOURCE; | |
1249 | } | |
1250 | return sts; | |
1251 | } | |
1252 | ||
8f94d1c1 CK |
1253 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
1254 | sector_t sector, | |
1255 | sector_t nr_sectors) | |
1256 | { | |
1257 | struct badblocks *bb = &cmd->nq->dev->badblocks; | |
1258 | sector_t first_bad; | |
1259 | int bad_sectors; | |
1260 | ||
1261 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) | |
1262 | return BLK_STS_IOERR; | |
1263 | ||
1264 | return BLK_STS_OK; | |
1265 | } | |
1266 | ||
7ea88e22 | 1267 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
ff07a02e | 1268 | enum req_op op, |
49c7089f DLM |
1269 | sector_t sector, |
1270 | sector_t nr_sectors) | |
7ea88e22 CK |
1271 | { |
1272 | struct nullb_device *dev = cmd->nq->dev; | |
7ea88e22 | 1273 | |
49c7089f DLM |
1274 | if (op == REQ_OP_DISCARD) |
1275 | return null_handle_discard(dev, sector, nr_sectors); | |
8b631f9c | 1276 | return errno_to_blk_status(null_handle_rq(cmd)); |
49c7089f | 1277 | |
7ea88e22 CK |
1278 | } |
1279 | ||
cecbc9ce BVA |
1280 | static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd) |
1281 | { | |
8b631f9c | 1282 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
cecbc9ce BVA |
1283 | struct nullb_device *dev = cmd->nq->dev; |
1284 | struct bio *bio; | |
1285 | ||
8b631f9c CH |
1286 | if (!dev->memory_backed && req_op(rq) == REQ_OP_READ) { |
1287 | __rq_for_each_bio(bio, rq) | |
cecbc9ce BVA |
1288 | zero_fill_bio(bio); |
1289 | } | |
1290 | } | |
1291 | ||
a3d7d674 CK |
1292 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
1293 | { | |
8b631f9c CH |
1294 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
1295 | ||
cecbc9ce BVA |
1296 | /* |
1297 | * Since root privileges are required to configure the null_blk | |
1298 | * driver, it is fine that this driver does not initialize the | |
1299 | * data buffers of read commands. Zero-initialize these buffers | |
1300 | * anyway if KMSAN is enabled to prevent that KMSAN complains | |
1301 | * about null_blk not initializing read data buffers. | |
1302 | */ | |
1303 | if (IS_ENABLED(CONFIG_KMSAN)) | |
1304 | nullb_zero_read_cmd_buffer(cmd); | |
1305 | ||
a3d7d674 CK |
1306 | /* Complete IO by inline, softirq or timer */ |
1307 | switch (cmd->nq->dev->irqmode) { | |
1308 | case NULL_IRQ_SOFTIRQ: | |
8b631f9c | 1309 | blk_mq_complete_request(rq); |
a3d7d674 CK |
1310 | break; |
1311 | case NULL_IRQ_NONE: | |
8b631f9c | 1312 | blk_mq_end_request(rq, cmd->error); |
a3d7d674 CK |
1313 | break; |
1314 | case NULL_IRQ_TIMER: | |
1315 | null_cmd_end_timer(cmd); | |
1316 | break; | |
1317 | } | |
1318 | } | |
1319 | ||
ff07a02e BVA |
1320 | blk_status_t null_process_cmd(struct nullb_cmd *cmd, enum req_op op, |
1321 | sector_t sector, unsigned int nr_sectors) | |
9dd44c7e DLM |
1322 | { |
1323 | struct nullb_device *dev = cmd->nq->dev; | |
1324 | blk_status_t ret; | |
1325 | ||
1326 | if (dev->badblocks.shift != -1) { | |
1327 | ret = null_handle_badblocks(cmd, sector, nr_sectors); | |
1328 | if (ret != BLK_STS_OK) | |
1329 | return ret; | |
1330 | } | |
1331 | ||
1332 | if (dev->memory_backed) | |
49c7089f | 1333 | return null_handle_memory_backed(cmd, op, sector, nr_sectors); |
9dd44c7e DLM |
1334 | |
1335 | return BLK_STS_OK; | |
1336 | } | |
1337 | ||
53f2bca2 CZ |
1338 | static void null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
1339 | sector_t nr_sectors, enum req_op op) | |
5bcd0e0c SL |
1340 | { |
1341 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1342 | struct nullb *nullb = dev->nullb; |
adb84284 | 1343 | blk_status_t sts; |
5bcd0e0c | 1344 | |
d4b186ed CK |
1345 | if (op == REQ_OP_FLUSH) { |
1346 | cmd->error = errno_to_blk_status(null_handle_flush(nullb)); | |
1347 | goto out; | |
1348 | } | |
d4b186ed | 1349 | |
9dd44c7e | 1350 | if (dev->zoned) |
de3510e5 | 1351 | sts = null_process_zoned_cmd(cmd, op, sector, nr_sectors); |
9dd44c7e | 1352 | else |
de3510e5 DLM |
1353 | sts = null_process_cmd(cmd, op, sector, nr_sectors); |
1354 | ||
1355 | /* Do not overwrite errors (e.g. timeout errors) */ | |
1356 | if (cmd->error == BLK_STS_OK) | |
1357 | cmd->error = sts; | |
fceb5d1b | 1358 | |
2f54a613 | 1359 | out: |
a3d7d674 | 1360 | nullb_complete_cmd(cmd); |
f2298c04 JA |
1361 | } |
1362 | ||
eff2c4f1 SL |
1363 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1364 | { | |
1365 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1366 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1367 | unsigned int mbps = nullb->dev->mbps; | |
1368 | ||
1369 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1370 | return HRTIMER_NORESTART; | |
1371 | ||
1372 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
8b631f9c | 1373 | blk_mq_start_stopped_hw_queues(nullb->q, true); |
eff2c4f1 SL |
1374 | |
1375 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1376 | ||
1377 | return HRTIMER_RESTART; | |
1378 | } | |
1379 | ||
1380 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1381 | { | |
1382 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1383 | ||
1384 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1385 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1386 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1387 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1388 | } |
1389 | ||
bb4c19e0 AM |
1390 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
1391 | ||
1392 | static bool should_timeout_request(struct request *rq) | |
1393 | { | |
1394 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
1395 | struct nullb_device *dev = cmd->nq->dev; | |
1396 | ||
1397 | return should_fail(&dev->timeout_config.attr, 1); | |
1398 | } | |
1399 | ||
1400 | static bool should_requeue_request(struct request *rq) | |
1401 | { | |
1402 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
1403 | struct nullb_device *dev = cmd->nq->dev; | |
1404 | ||
1405 | return should_fail(&dev->requeue_config.attr, 1); | |
1406 | } | |
1407 | ||
1408 | static bool should_init_hctx_fail(struct nullb_device *dev) | |
1409 | { | |
1410 | return should_fail(&dev->init_hctx_fault_config.attr, 1); | |
1411 | } | |
1412 | ||
1413 | #else | |
1414 | ||
93b57046 JA |
1415 | static bool should_timeout_request(struct request *rq) |
1416 | { | |
24941b90 JA |
1417 | return false; |
1418 | } | |
93b57046 | 1419 | |
24941b90 JA |
1420 | static bool should_requeue_request(struct request *rq) |
1421 | { | |
93b57046 JA |
1422 | return false; |
1423 | } | |
1424 | ||
bb4c19e0 AM |
1425 | static bool should_init_hctx_fail(struct nullb_device *dev) |
1426 | { | |
1427 | return false; | |
1428 | } | |
1429 | ||
1430 | #endif | |
1431 | ||
a4e1d0b7 | 1432 | static void null_map_queues(struct blk_mq_tag_set *set) |
0a593fbb JA |
1433 | { |
1434 | struct nullb *nullb = set->driver_data; | |
1435 | int i, qoff; | |
15dfc662 SK |
1436 | unsigned int submit_queues = g_submit_queues; |
1437 | unsigned int poll_queues = g_poll_queues; | |
1438 | ||
1439 | if (nullb) { | |
1440 | struct nullb_device *dev = nullb->dev; | |
1441 | ||
1442 | /* | |
1443 | * Refer nr_hw_queues of the tag set to check if the expected | |
1444 | * number of hardware queues are prepared. If block layer failed | |
1445 | * to prepare them, use previous numbers of submit queues and | |
1446 | * poll queues to map queues. | |
1447 | */ | |
1448 | if (set->nr_hw_queues == | |
1449 | dev->submit_queues + dev->poll_queues) { | |
1450 | submit_queues = dev->submit_queues; | |
1451 | poll_queues = dev->poll_queues; | |
1452 | } else if (set->nr_hw_queues == | |
1453 | dev->prev_submit_queues + dev->prev_poll_queues) { | |
1454 | submit_queues = dev->prev_submit_queues; | |
1455 | poll_queues = dev->prev_poll_queues; | |
1456 | } else { | |
1457 | pr_warn("tag set has unexpected nr_hw_queues: %d\n", | |
1458 | set->nr_hw_queues); | |
10b41ea1 BVA |
1459 | WARN_ON_ONCE(true); |
1460 | submit_queues = 1; | |
1461 | poll_queues = 0; | |
15dfc662 SK |
1462 | } |
1463 | } | |
0a593fbb JA |
1464 | |
1465 | for (i = 0, qoff = 0; i < set->nr_maps; i++) { | |
1466 | struct blk_mq_queue_map *map = &set->map[i]; | |
1467 | ||
1468 | switch (i) { | |
1469 | case HCTX_TYPE_DEFAULT: | |
15dfc662 | 1470 | map->nr_queues = submit_queues; |
0a593fbb JA |
1471 | break; |
1472 | case HCTX_TYPE_READ: | |
1473 | map->nr_queues = 0; | |
1474 | continue; | |
1475 | case HCTX_TYPE_POLL: | |
15dfc662 | 1476 | map->nr_queues = poll_queues; |
0a593fbb JA |
1477 | break; |
1478 | } | |
1479 | map->queue_offset = qoff; | |
1480 | qoff += map->nr_queues; | |
1481 | blk_mq_map_queues(map); | |
1482 | } | |
0a593fbb JA |
1483 | } |
1484 | ||
1485 | static int null_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob) | |
1486 | { | |
1487 | struct nullb_queue *nq = hctx->driver_data; | |
1488 | LIST_HEAD(list); | |
1489 | int nr = 0; | |
5a26e45e | 1490 | struct request *rq; |
0a593fbb JA |
1491 | |
1492 | spin_lock(&nq->poll_lock); | |
1493 | list_splice_init(&nq->poll_list, &list); | |
5a26e45e CZ |
1494 | list_for_each_entry(rq, &list, queuelist) |
1495 | blk_mq_set_request_complete(rq); | |
0a593fbb JA |
1496 | spin_unlock(&nq->poll_lock); |
1497 | ||
1498 | while (!list_empty(&list)) { | |
1499 | struct nullb_cmd *cmd; | |
1500 | struct request *req; | |
1501 | ||
1502 | req = list_first_entry(&list, struct request, queuelist); | |
1503 | list_del_init(&req->queuelist); | |
1504 | cmd = blk_mq_rq_to_pdu(req); | |
1505 | cmd->error = null_process_cmd(cmd, req_op(req), blk_rq_pos(req), | |
1506 | blk_rq_sectors(req)); | |
c5eafd79 | 1507 | if (!blk_mq_add_to_batch(req, iob, (__force int) cmd->error, |
2385ebf3 | 1508 | blk_mq_end_request_batch)) |
8b631f9c | 1509 | blk_mq_end_request(req, cmd->error); |
0a593fbb JA |
1510 | nr++; |
1511 | } | |
1512 | ||
1513 | return nr; | |
1514 | } | |
1515 | ||
9bdb4833 | 1516 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq) |
5448aca4 | 1517 | { |
0a593fbb | 1518 | struct blk_mq_hw_ctx *hctx = rq->mq_hctx; |
de3510e5 DLM |
1519 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); |
1520 | ||
0a593fbb JA |
1521 | if (hctx->type == HCTX_TYPE_POLL) { |
1522 | struct nullb_queue *nq = hctx->driver_data; | |
1523 | ||
1524 | spin_lock(&nq->poll_lock); | |
5a26e45e CZ |
1525 | /* The request may have completed meanwhile. */ |
1526 | if (blk_mq_request_completed(rq)) { | |
1527 | spin_unlock(&nq->poll_lock); | |
1528 | return BLK_EH_DONE; | |
1529 | } | |
0a593fbb JA |
1530 | list_del_init(&rq->queuelist); |
1531 | spin_unlock(&nq->poll_lock); | |
1532 | } | |
1533 | ||
5a26e45e CZ |
1534 | pr_info("rq %p timed out\n", rq); |
1535 | ||
de3510e5 DLM |
1536 | /* |
1537 | * If the device is marked as blocking (i.e. memory backed or zoned | |
1538 | * device), the submission path may be blocked waiting for resources | |
1539 | * and cause real timeouts. For these real timeouts, the submission | |
1540 | * path will complete the request using blk_mq_complete_request(). | |
1541 | * Only fake timeouts need to execute blk_mq_complete_request() here. | |
1542 | */ | |
1543 | cmd->error = BLK_STS_TIMEOUT; | |
3e3876d3 | 1544 | if (cmd->fake_timeout || hctx->type == HCTX_TYPE_POLL) |
de3510e5 | 1545 | blk_mq_complete_request(rq); |
0df0bb08 | 1546 | return BLK_EH_DONE; |
5448aca4 JA |
1547 | } |
1548 | ||
fc17b653 | 1549 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
b6402014 | 1550 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1551 | { |
b6402014 DLM |
1552 | struct request *rq = bd->rq; |
1553 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
2984c868 | 1554 | struct nullb_queue *nq = hctx->driver_data; |
b6402014 DLM |
1555 | sector_t nr_sectors = blk_rq_sectors(rq); |
1556 | sector_t sector = blk_rq_pos(rq); | |
0a593fbb | 1557 | const bool is_poll = hctx->type == HCTX_TYPE_POLL; |
f2298c04 | 1558 | |
db5bcf87 JA |
1559 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1560 | ||
0a593fbb | 1561 | if (!is_poll && nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1562 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1563 | cmd->timer.function = null_cmd_timer_expired; | |
1564 | } | |
ff770422 | 1565 | cmd->error = BLK_STS_OK; |
2984c868 | 1566 | cmd->nq = nq; |
b6402014 DLM |
1567 | cmd->fake_timeout = should_timeout_request(rq) || |
1568 | blk_should_fake_timeout(rq->q); | |
f2298c04 | 1569 | |
b6402014 | 1570 | if (should_requeue_request(rq)) { |
24941b90 JA |
1571 | /* |
1572 | * Alternate between hitting the core BUSY path, and the | |
1573 | * driver driven requeue path | |
1574 | */ | |
1575 | nq->requeue_selection++; | |
1576 | if (nq->requeue_selection & 1) | |
1577 | return BLK_STS_RESOURCE; | |
b6402014 DLM |
1578 | blk_mq_requeue_request(rq, true); |
1579 | return BLK_STS_OK; | |
24941b90 | 1580 | } |
0a593fbb | 1581 | |
53f2bca2 CZ |
1582 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nq->dev->flags)) { |
1583 | blk_status_t sts = null_handle_throttled(cmd); | |
1584 | ||
1585 | if (sts != BLK_STS_OK) | |
1586 | return sts; | |
1587 | } | |
1588 | ||
1589 | blk_mq_start_request(rq); | |
1590 | ||
0a593fbb JA |
1591 | if (is_poll) { |
1592 | spin_lock(&nq->poll_lock); | |
b6402014 | 1593 | list_add_tail(&rq->queuelist, &nq->poll_list); |
0a593fbb JA |
1594 | spin_unlock(&nq->poll_lock); |
1595 | return BLK_STS_OK; | |
1596 | } | |
de3510e5 | 1597 | if (cmd->fake_timeout) |
24941b90 | 1598 | return BLK_STS_OK; |
93b57046 | 1599 | |
53f2bca2 CZ |
1600 | null_handle_cmd(cmd, sector, nr_sectors, req_op(rq)); |
1601 | return BLK_STS_OK; | |
f2298c04 JA |
1602 | } |
1603 | ||
d78bfa13 CZ |
1604 | static void null_queue_rqs(struct request **rqlist) |
1605 | { | |
1606 | struct request *requeue_list = NULL; | |
1607 | struct request **requeue_lastp = &requeue_list; | |
1608 | struct blk_mq_queue_data bd = { }; | |
1609 | blk_status_t ret; | |
1610 | ||
1611 | do { | |
1612 | struct request *rq = rq_list_pop(rqlist); | |
1613 | ||
1614 | bd.rq = rq; | |
1615 | ret = null_queue_rq(rq->mq_hctx, &bd); | |
1616 | if (ret != BLK_STS_OK) | |
1617 | rq_list_add_tail(&requeue_lastp, rq); | |
1618 | } while (!rq_list_empty(*rqlist)); | |
1619 | ||
1620 | *rqlist = requeue_list; | |
1621 | } | |
1622 | ||
78b10be2 BVA |
1623 | static void null_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
1624 | { | |
1625 | struct nullb_queue *nq = hctx->driver_data; | |
1626 | struct nullb *nullb = nq->dev->nullb; | |
1627 | ||
1628 | nullb->nr_queues--; | |
1629 | } | |
1630 | ||
1631 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) | |
1632 | { | |
78b10be2 | 1633 | nq->dev = nullb->dev; |
0a593fbb JA |
1634 | INIT_LIST_HEAD(&nq->poll_list); |
1635 | spin_lock_init(&nq->poll_lock); | |
78b10be2 BVA |
1636 | } |
1637 | ||
1638 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, | |
1639 | unsigned int hctx_idx) | |
1640 | { | |
1641 | struct nullb *nullb = hctx->queue->queuedata; | |
1642 | struct nullb_queue *nq; | |
1643 | ||
bb4c19e0 | 1644 | if (should_init_hctx_fail(nullb->dev)) |
596444e7 | 1645 | return -EFAULT; |
596444e7 | 1646 | |
78b10be2 BVA |
1647 | nq = &nullb->queues[hctx_idx]; |
1648 | hctx->driver_data = nq; | |
1649 | null_init_queue(nullb, nq); | |
1650 | nullb->nr_queues++; | |
1651 | ||
1652 | return 0; | |
1653 | } | |
1654 | ||
1655 | static const struct blk_mq_ops null_mq_ops = { | |
1656 | .queue_rq = null_queue_rq, | |
d78bfa13 | 1657 | .queue_rqs = null_queue_rqs, |
78b10be2 BVA |
1658 | .complete = null_complete_rq, |
1659 | .timeout = null_timeout_rq, | |
0a593fbb JA |
1660 | .poll = null_poll, |
1661 | .map_queues = null_map_queues, | |
78b10be2 BVA |
1662 | .init_hctx = null_init_hctx, |
1663 | .exit_hctx = null_exit_hctx, | |
1664 | }; | |
1665 | ||
9ae2d0aa MB |
1666 | static void null_del_dev(struct nullb *nullb) |
1667 | { | |
9b03b713 BVA |
1668 | struct nullb_device *dev; |
1669 | ||
1670 | if (!nullb) | |
1671 | return; | |
1672 | ||
1673 | dev = nullb->dev; | |
2984c868 | 1674 | |
95931a24 | 1675 | ida_free(&nullb_indexes, nullb->index); |
94bc02e3 | 1676 | |
9ae2d0aa MB |
1677 | list_del_init(&nullb->list); |
1678 | ||
74ede5af | 1679 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1680 | |
1681 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1682 | hrtimer_cancel(&nullb->bw_timer); | |
1683 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
8b631f9c | 1684 | blk_mq_start_stopped_hw_queues(nullb->q, true); |
eff2c4f1 SL |
1685 | } |
1686 | ||
8b9ab626 | 1687 | put_disk(nullb->disk); |
8b631f9c | 1688 | if (nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1689 | blk_mq_free_tag_set(nullb->tag_set); |
8b631f9c | 1690 | kfree(nullb->queues); |
deb78b41 SL |
1691 | if (null_cache_active(nullb)) |
1692 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1693 | kfree(nullb); |
2984c868 | 1694 | dev->nullb = NULL; |
9ae2d0aa MB |
1695 | } |
1696 | ||
306eb6b4 SL |
1697 | static void null_config_discard(struct nullb *nullb) |
1698 | { | |
1699 | if (nullb->dev->discard == false) | |
1700 | return; | |
1592cd15 | 1701 | |
49c7089f DLM |
1702 | if (!nullb->dev->memory_backed) { |
1703 | nullb->dev->discard = false; | |
1704 | pr_info("discard option is ignored without memory backing\n"); | |
1705 | return; | |
1706 | } | |
1707 | ||
1592cd15 CK |
1708 | if (nullb->dev->zoned) { |
1709 | nullb->dev->discard = false; | |
1710 | pr_info("discard option is ignored in zoned mode\n"); | |
1711 | return; | |
1712 | } | |
1713 | ||
306eb6b4 | 1714 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); |
9ae2d0aa MB |
1715 | } |
1716 | ||
8b631f9c | 1717 | static const struct block_device_operations null_ops = { |
c62b37d9 | 1718 | .owner = THIS_MODULE, |
c62b37d9 CH |
1719 | .report_zones = null_report_zones, |
1720 | }; | |
1721 | ||
f2298c04 JA |
1722 | static int setup_queues(struct nullb *nullb) |
1723 | { | |
0a593fbb JA |
1724 | int nqueues = nr_cpu_ids; |
1725 | ||
1726 | if (g_poll_queues) | |
1727 | nqueues += g_poll_queues; | |
1728 | ||
1729 | nullb->queues = kcalloc(nqueues, sizeof(struct nullb_queue), | |
6396bb22 | 1730 | GFP_KERNEL); |
f2298c04 | 1731 | if (!nullb->queues) |
2d263a78 | 1732 | return -ENOMEM; |
f2298c04 | 1733 | |
2984c868 | 1734 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
2d263a78 MB |
1735 | return 0; |
1736 | } | |
1737 | ||
9ae2d0aa | 1738 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 | 1739 | { |
979d5447 | 1740 | sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT; |
132226b3 | 1741 | struct gendisk *disk = nullb->disk; |
9ae2d0aa | 1742 | |
979d5447 | 1743 | set_capacity(disk, size); |
9ae2d0aa | 1744 | |
9ae2d0aa MB |
1745 | disk->major = null_major; |
1746 | disk->first_minor = nullb->index; | |
132226b3 | 1747 | disk->minors = 1; |
8b631f9c | 1748 | disk->fops = &null_ops; |
9ae2d0aa | 1749 | disk->private_data = nullb; |
e1f2760b | 1750 | strscpy_pad(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); |
9ae2d0aa | 1751 | |
bf505456 | 1752 | if (nullb->dev->zoned) { |
d205bde7 DLM |
1753 | int ret = null_register_zoned_dev(nullb); |
1754 | ||
1755 | if (ret) | |
1756 | return ret; | |
bf505456 DLM |
1757 | } |
1758 | ||
10e7123d | 1759 | return add_disk(disk); |
9ae2d0aa MB |
1760 | } |
1761 | ||
2984c868 | 1762 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe | 1763 | { |
7012eef5 VF |
1764 | unsigned int flags = BLK_MQ_F_SHOULD_MERGE; |
1765 | int hw_queues, numa_node; | |
1766 | unsigned int queue_depth; | |
0a593fbb JA |
1767 | int poll_queues; |
1768 | ||
7012eef5 VF |
1769 | if (nullb) { |
1770 | hw_queues = nullb->dev->submit_queues; | |
1771 | poll_queues = nullb->dev->poll_queues; | |
1772 | queue_depth = nullb->dev->hw_queue_depth; | |
1773 | numa_node = nullb->dev->home_node; | |
1774 | if (nullb->dev->no_sched) | |
1775 | flags |= BLK_MQ_F_NO_SCHED; | |
1776 | if (nullb->dev->shared_tag_bitmap) | |
1777 | flags |= BLK_MQ_F_TAG_HCTX_SHARED; | |
1778 | if (nullb->dev->blocking) | |
1779 | flags |= BLK_MQ_F_BLOCKING; | |
1780 | } else { | |
1781 | hw_queues = g_submit_queues; | |
1782 | poll_queues = g_poll_queues; | |
1783 | queue_depth = g_hw_queue_depth; | |
1784 | numa_node = g_home_node; | |
1785 | if (g_no_sched) | |
1786 | flags |= BLK_MQ_F_NO_SCHED; | |
1787 | if (g_shared_tag_bitmap) | |
1788 | flags |= BLK_MQ_F_TAG_HCTX_SHARED; | |
1789 | if (g_blocking) | |
1790 | flags |= BLK_MQ_F_BLOCKING; | |
1791 | } | |
1792 | ||
82f402fe | 1793 | set->ops = &null_mq_ops; |
82f402fe | 1794 | set->cmd_size = sizeof(struct nullb_cmd); |
7012eef5 | 1795 | set->flags = flags; |
0a593fbb | 1796 | set->driver_data = nullb; |
7012eef5 VF |
1797 | set->nr_hw_queues = hw_queues; |
1798 | set->queue_depth = queue_depth; | |
1799 | set->numa_node = numa_node; | |
e32b0855 | 1800 | set->timeout = 5 * HZ; |
7012eef5 VF |
1801 | if (poll_queues) { |
1802 | set->nr_hw_queues += poll_queues; | |
0a593fbb | 1803 | set->nr_maps = 3; |
7012eef5 | 1804 | } else { |
0a593fbb | 1805 | set->nr_maps = 1; |
7012eef5 | 1806 | } |
82f402fe JA |
1807 | |
1808 | return blk_mq_alloc_tag_set(set); | |
1809 | } | |
1810 | ||
5c4bd1f4 | 1811 | static int null_validate_conf(struct nullb_device *dev) |
cedcafad | 1812 | { |
63f8793e CK |
1813 | if (dev->queue_mode == NULL_Q_RQ) { |
1814 | pr_err("legacy IO path is no longer available\n"); | |
1815 | return -EINVAL; | |
1816 | } | |
8b631f9c CH |
1817 | if (dev->queue_mode == NULL_Q_BIO) { |
1818 | pr_err("BIO-based IO path is no longer available, using blk-mq instead.\n"); | |
1819 | dev->queue_mode = NULL_Q_MQ; | |
1820 | } | |
63f8793e | 1821 | |
cedcafad SL |
1822 | dev->blocksize = round_down(dev->blocksize, 512); |
1823 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad | 1824 | |
8b631f9c | 1825 | if (dev->use_per_node_hctx) { |
cedcafad SL |
1826 | if (dev->submit_queues != nr_online_nodes) |
1827 | dev->submit_queues = nr_online_nodes; | |
1828 | } else if (dev->submit_queues > nr_cpu_ids) | |
1829 | dev->submit_queues = nr_cpu_ids; | |
1830 | else if (dev->submit_queues == 0) | |
1831 | dev->submit_queues = 1; | |
15dfc662 SK |
1832 | dev->prev_submit_queues = dev->submit_queues; |
1833 | ||
1834 | if (dev->poll_queues > g_poll_queues) | |
1835 | dev->poll_queues = g_poll_queues; | |
15dfc662 | 1836 | dev->prev_poll_queues = dev->poll_queues; |
cedcafad | 1837 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); |
5bcd0e0c SL |
1838 | |
1839 | /* Do memory allocation, so set blocking */ | |
1840 | if (dev->memory_backed) | |
1841 | dev->blocking = true; | |
deb78b41 SL |
1842 | else /* cache is meaningless */ |
1843 | dev->cache_size = 0; | |
1844 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1845 | dev->cache_size); | |
eff2c4f1 | 1846 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
5c4bd1f4 DLM |
1847 | |
1848 | if (dev->zoned && | |
1849 | (!dev->zone_size || !is_power_of_2(dev->zone_size))) { | |
1850 | pr_err("zone_size must be power-of-two\n"); | |
1851 | return -EINVAL; | |
1852 | } | |
1853 | ||
1854 | return 0; | |
cedcafad SL |
1855 | } |
1856 | ||
33f782c4 | 1857 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1858 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1859 | { | |
1860 | if (!str[0]) | |
93b57046 JA |
1861 | return true; |
1862 | ||
24941b90 | 1863 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1864 | return false; |
1865 | ||
24941b90 JA |
1866 | attr->verbose = 0; |
1867 | return true; | |
1868 | } | |
1869 | #endif | |
1870 | ||
1871 | static bool null_setup_fault(void) | |
1872 | { | |
1873 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1874 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1875 | return false; | |
1876 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1877 | return false; | |
596444e7 BVA |
1878 | if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str)) |
1879 | return false; | |
33f782c4 | 1880 | #endif |
93b57046 JA |
1881 | return true; |
1882 | } | |
1883 | ||
2984c868 | 1884 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1885 | { |
1886 | struct nullb *nullb; | |
dc501dc0 | 1887 | int rv; |
f2298c04 | 1888 | |
5c4bd1f4 DLM |
1889 | rv = null_validate_conf(dev); |
1890 | if (rv) | |
1891 | return rv; | |
cedcafad | 1892 | |
2984c868 | 1893 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1894 | if (!nullb) { |
1895 | rv = -ENOMEM; | |
24d2f903 | 1896 | goto out; |
dc501dc0 | 1897 | } |
2984c868 SL |
1898 | nullb->dev = dev; |
1899 | dev->nullb = nullb; | |
f2298c04 JA |
1900 | |
1901 | spin_lock_init(&nullb->lock); | |
1902 | ||
dc501dc0 RE |
1903 | rv = setup_queues(nullb); |
1904 | if (rv) | |
24d2f903 | 1905 | goto out_free_nullb; |
f2298c04 | 1906 | |
8b631f9c CH |
1907 | if (dev->shared_tags) { |
1908 | if (!tag_set.ops) { | |
1909 | rv = null_init_tag_set(NULL, &tag_set); | |
1910 | if (rv) { | |
1911 | tag_set.ops = NULL; | |
1912 | goto out_cleanup_queues; | |
14509b74 | 1913 | } |
82f402fe | 1914 | } |
8b631f9c CH |
1915 | nullb->tag_set = &tag_set; |
1916 | rv = 0; | |
1917 | } else { | |
1918 | nullb->tag_set = &nullb->__tag_set; | |
1919 | rv = null_init_tag_set(nullb, nullb->tag_set); | |
1920 | } | |
82f402fe | 1921 | |
8b631f9c CH |
1922 | if (rv) |
1923 | goto out_cleanup_queues; | |
132226b3 | 1924 | |
8b631f9c CH |
1925 | nullb->disk = blk_mq_alloc_disk(nullb->tag_set, NULL, nullb); |
1926 | if (IS_ERR(nullb->disk)) { | |
1927 | rv = PTR_ERR(nullb->disk); | |
1928 | goto out_cleanup_tags; | |
f2298c04 | 1929 | } |
8b631f9c | 1930 | nullb->q = nullb->disk->queue; |
f2298c04 | 1931 | |
eff2c4f1 SL |
1932 | if (dev->mbps) { |
1933 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1934 | nullb_setup_bwtimer(nullb); | |
1935 | } | |
1936 | ||
deb78b41 SL |
1937 | if (dev->cache_size > 0) { |
1938 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1939 | blk_queue_write_cache(nullb->q, true, true); | |
deb78b41 SL |
1940 | } |
1941 | ||
ca4b2a01 | 1942 | if (dev->zoned) { |
d205bde7 | 1943 | rv = null_init_zoned_dev(dev, nullb->q); |
ca4b2a01 | 1944 | if (rv) |
132226b3 | 1945 | goto out_cleanup_disk; |
ca4b2a01 MB |
1946 | } |
1947 | ||
f2298c04 | 1948 | nullb->q->queuedata = nullb; |
8b904b5b | 1949 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
f2298c04 | 1950 | |
f2298c04 | 1951 | mutex_lock(&lock); |
95931a24 | 1952 | rv = ida_alloc(&nullb_indexes, GFP_KERNEL); |
ee452a8d DC |
1953 | if (rv < 0) { |
1954 | mutex_unlock(&lock); | |
1955 | goto out_cleanup_zone; | |
1956 | } | |
1957 | nullb->index = rv; | |
1958 | dev->index = rv; | |
f2298c04 JA |
1959 | mutex_unlock(&lock); |
1960 | ||
2984c868 SL |
1961 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1962 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
9a9525de CH |
1963 | if (dev->max_sectors) |
1964 | blk_queue_max_hw_sectors(nullb->q, dev->max_sectors); | |
f2298c04 | 1965 | |
cee1b215 MG |
1966 | if (dev->virt_boundary) |
1967 | blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1); | |
1968 | ||
306eb6b4 | 1969 | null_config_discard(nullb); |
f2298c04 | 1970 | |
bb4c19e0 | 1971 | if (config_item_name(&dev->group.cg_item)) { |
49c3b926 DLM |
1972 | /* Use configfs dir name as the device name */ |
1973 | snprintf(nullb->disk_name, sizeof(nullb->disk_name), | |
bb4c19e0 | 1974 | "%s", config_item_name(&dev->group.cg_item)); |
49c3b926 DLM |
1975 | } else { |
1976 | sprintf(nullb->disk_name, "nullb%d", nullb->index); | |
1977 | } | |
b2b7e001 | 1978 | |
74ede5af | 1979 | rv = null_gendisk_register(nullb); |
9ae2d0aa | 1980 | if (rv) |
ee452a8d | 1981 | goto out_ida_free; |
a514379b MB |
1982 | |
1983 | mutex_lock(&lock); | |
1984 | list_add_tail(&nullb->list, &nullb_list); | |
1985 | mutex_unlock(&lock); | |
3681c85d | 1986 | |
db060f54 DLM |
1987 | pr_info("disk %s created\n", nullb->disk_name); |
1988 | ||
f2298c04 | 1989 | return 0; |
ee452a8d DC |
1990 | |
1991 | out_ida_free: | |
1992 | ida_free(&nullb_indexes, nullb->index); | |
ca4b2a01 | 1993 | out_cleanup_zone: |
d205bde7 | 1994 | null_free_zoned_dev(dev); |
132226b3 | 1995 | out_cleanup_disk: |
8b9ab626 | 1996 | put_disk(nullb->disk); |
24d2f903 | 1997 | out_cleanup_tags: |
8b631f9c | 1998 | if (nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1999 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 | 2000 | out_cleanup_queues: |
8b631f9c | 2001 | kfree(nullb->queues); |
24d2f903 CH |
2002 | out_free_nullb: |
2003 | kfree(nullb); | |
2004bfde | 2004 | dev->nullb = NULL; |
24d2f903 | 2005 | out: |
dc501dc0 | 2006 | return rv; |
f2298c04 JA |
2007 | } |
2008 | ||
49c3b926 DLM |
2009 | static struct nullb *null_find_dev_by_name(const char *name) |
2010 | { | |
2011 | struct nullb *nullb = NULL, *nb; | |
2012 | ||
2013 | mutex_lock(&lock); | |
2014 | list_for_each_entry(nb, &nullb_list, list) { | |
2015 | if (strcmp(nb->disk_name, name) == 0) { | |
2016 | nullb = nb; | |
2017 | break; | |
2018 | } | |
2019 | } | |
2020 | mutex_unlock(&lock); | |
2021 | ||
2022 | return nullb; | |
2023 | } | |
2024 | ||
b3a0a73e DLM |
2025 | static int null_create_dev(void) |
2026 | { | |
2027 | struct nullb_device *dev; | |
2028 | int ret; | |
2029 | ||
2030 | dev = null_alloc_dev(); | |
2031 | if (!dev) | |
2032 | return -ENOMEM; | |
2033 | ||
2034 | ret = null_add_dev(dev); | |
2035 | if (ret) { | |
2036 | null_free_dev(dev); | |
2037 | return ret; | |
2038 | } | |
2039 | ||
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | static void null_destroy_dev(struct nullb *nullb) | |
2044 | { | |
2045 | struct nullb_device *dev = nullb->dev; | |
2046 | ||
2047 | null_del_dev(nullb); | |
8cfb9819 | 2048 | null_free_device_storage(dev, false); |
b3a0a73e DLM |
2049 | null_free_dev(dev); |
2050 | } | |
2051 | ||
f2298c04 JA |
2052 | static int __init null_init(void) |
2053 | { | |
af096e22 | 2054 | int ret = 0; |
f2298c04 | 2055 | unsigned int i; |
af096e22 | 2056 | struct nullb *nullb; |
f2298c04 | 2057 | |
2984c868 | 2058 | if (g_bs > PAGE_SIZE) { |
9c7eddf1 AA |
2059 | pr_warn("invalid block size\n"); |
2060 | pr_warn("defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 2061 | g_bs = PAGE_SIZE; |
9967d8ac | 2062 | } |
f2298c04 | 2063 | |
7ff684a6 | 2064 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
9c7eddf1 | 2065 | pr_err("invalid home_node value\n"); |
7ff684a6 JP |
2066 | g_home_node = NUMA_NO_NODE; |
2067 | } | |
2068 | ||
bb4c19e0 AM |
2069 | if (!null_setup_fault()) |
2070 | return -EINVAL; | |
2071 | ||
e50b1e32 | 2072 | if (g_queue_mode == NULL_Q_RQ) { |
525323d2 | 2073 | pr_err("legacy IO path is no longer available\n"); |
e50b1e32 JA |
2074 | return -EINVAL; |
2075 | } | |
525323d2 | 2076 | |
8b631f9c | 2077 | if (g_use_per_node_hctx) { |
2984c868 | 2078 | if (g_submit_queues != nr_online_nodes) { |
9c7eddf1 | 2079 | pr_warn("submit_queues param is set to %u.\n", |
525323d2 | 2080 | nr_online_nodes); |
2984c868 | 2081 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 2082 | } |
525323d2 | 2083 | } else if (g_submit_queues > nr_cpu_ids) { |
2984c868 | 2084 | g_submit_queues = nr_cpu_ids; |
525323d2 | 2085 | } else if (g_submit_queues <= 0) { |
2984c868 | 2086 | g_submit_queues = 1; |
525323d2 | 2087 | } |
f2298c04 | 2088 | |
3bf2bd20 SL |
2089 | config_group_init(&nullb_subsys.su_group); |
2090 | mutex_init(&nullb_subsys.su_mutex); | |
2091 | ||
2092 | ret = configfs_register_subsystem(&nullb_subsys); | |
2093 | if (ret) | |
14509b74 | 2094 | return ret; |
3bf2bd20 | 2095 | |
f2298c04 JA |
2096 | mutex_init(&lock); |
2097 | ||
f2298c04 | 2098 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
2099 | if (null_major < 0) { |
2100 | ret = null_major; | |
3bf2bd20 | 2101 | goto err_conf; |
db2d153d | 2102 | } |
f2298c04 JA |
2103 | |
2104 | for (i = 0; i < nr_devices; i++) { | |
b3a0a73e DLM |
2105 | ret = null_create_dev(); |
2106 | if (ret) | |
af096e22 | 2107 | goto err_dev; |
f2298c04 JA |
2108 | } |
2109 | ||
9c7eddf1 | 2110 | pr_info("module loaded\n"); |
f2298c04 | 2111 | return 0; |
af096e22 MH |
2112 | |
2113 | err_dev: | |
2114 | while (!list_empty(&nullb_list)) { | |
2115 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
b3a0a73e | 2116 | null_destroy_dev(nullb); |
af096e22 | 2117 | } |
af096e22 | 2118 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
2119 | err_conf: |
2120 | configfs_unregister_subsystem(&nullb_subsys); | |
af096e22 | 2121 | return ret; |
f2298c04 JA |
2122 | } |
2123 | ||
2124 | static void __exit null_exit(void) | |
2125 | { | |
2126 | struct nullb *nullb; | |
2127 | ||
3bf2bd20 SL |
2128 | configfs_unregister_subsystem(&nullb_subsys); |
2129 | ||
f2298c04 JA |
2130 | unregister_blkdev(null_major, "nullb"); |
2131 | ||
2132 | mutex_lock(&lock); | |
2133 | while (!list_empty(&nullb_list)) { | |
2134 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
b3a0a73e | 2135 | null_destroy_dev(nullb); |
f2298c04 JA |
2136 | } |
2137 | mutex_unlock(&lock); | |
6bb9535b | 2138 | |
14509b74 | 2139 | if (tag_set.ops) |
82f402fe | 2140 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
2141 | } |
2142 | ||
2143 | module_init(null_init); | |
2144 | module_exit(null_exit); | |
2145 | ||
231b3db1 | 2146 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 2147 | MODULE_LICENSE("GPL"); |