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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 | ||
f4f84586 DLM |
228 | static bool g_fua = true; |
229 | module_param_named(fua, g_fua, bool, 0444); | |
230 | MODULE_PARM_DESC(zoned, "Enable/disable FUA support when cache_size is used. Default: true"); | |
231 | ||
058efe00 VF |
232 | static unsigned int g_mbps; |
233 | module_param_named(mbps, g_mbps, uint, 0444); | |
234 | MODULE_PARM_DESC(mbps, "Limit maximum bandwidth (in MiB/s). Default: 0 (no limit)"); | |
235 | ||
ca4b2a01 MB |
236 | static bool g_zoned; |
237 | module_param_named(zoned, g_zoned, bool, S_IRUGO); | |
238 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); | |
239 | ||
240 | static unsigned long g_zone_size = 256; | |
241 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); | |
242 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); | |
243 | ||
089565fb AR |
244 | static unsigned long g_zone_capacity; |
245 | module_param_named(zone_capacity, g_zone_capacity, ulong, 0444); | |
246 | 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"); | |
247 | ||
ea2c18e1 MS |
248 | static unsigned int g_zone_nr_conv; |
249 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); | |
250 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); | |
251 | ||
dc4d137e NC |
252 | static unsigned int g_zone_max_open; |
253 | module_param_named(zone_max_open, g_zone_max_open, uint, 0444); | |
254 | MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones when block device is zoned. Default: 0 (no limit)"); | |
255 | ||
256 | static unsigned int g_zone_max_active; | |
257 | module_param_named(zone_max_active, g_zone_max_active, uint, 0444); | |
258 | MODULE_PARM_DESC(zone_max_active, "Maximum number of active zones when block device is zoned. Default: 0 (no limit)"); | |
259 | ||
997a1f08 DLM |
260 | static int g_zone_append_max_sectors = INT_MAX; |
261 | module_param_named(zone_append_max_sectors, g_zone_append_max_sectors, int, 0444); | |
262 | MODULE_PARM_DESC(zone_append_max_sectors, | |
263 | "Maximum size of a zone append command (in 512B sectors). Specify 0 for zone append emulation"); | |
264 | ||
3bf2bd20 SL |
265 | static struct nullb_device *null_alloc_dev(void); |
266 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
267 | static void null_del_dev(struct nullb *nullb); |
268 | static int null_add_dev(struct nullb_device *dev); | |
49c3b926 | 269 | static struct nullb *null_find_dev_by_name(const char *name); |
deb78b41 | 270 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
271 | |
272 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
273 | { | |
bb4c19e0 | 274 | return item ? container_of(to_config_group(item), struct nullb_device, group) : NULL; |
3bf2bd20 SL |
275 | } |
276 | ||
277 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
278 | { | |
279 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
280 | } | |
281 | ||
282 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
283 | char *page) | |
284 | { | |
285 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
286 | } | |
287 | ||
288 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
289 | { | |
290 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
291 | } | |
292 | ||
293 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
294 | const char *page, size_t count) | |
295 | { | |
296 | unsigned int tmp; | |
297 | int result; | |
298 | ||
299 | result = kstrtouint(page, 0, &tmp); | |
45919fbf | 300 | if (result < 0) |
3bf2bd20 SL |
301 | return result; |
302 | ||
303 | *val = tmp; | |
304 | return count; | |
305 | } | |
306 | ||
307 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
308 | const char *page, size_t count) | |
309 | { | |
310 | int result; | |
311 | unsigned long tmp; | |
312 | ||
313 | result = kstrtoul(page, 0, &tmp); | |
45919fbf | 314 | if (result < 0) |
3bf2bd20 SL |
315 | return result; |
316 | ||
317 | *val = tmp; | |
318 | return count; | |
319 | } | |
320 | ||
321 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
322 | size_t count) | |
323 | { | |
324 | bool tmp; | |
325 | int result; | |
326 | ||
327 | result = kstrtobool(page, &tmp); | |
45919fbf | 328 | if (result < 0) |
3bf2bd20 SL |
329 | return result; |
330 | ||
331 | *val = tmp; | |
332 | return count; | |
333 | } | |
334 | ||
335 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
ca0a95a6 AM |
336 | #define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \ |
337 | static ssize_t \ | |
338 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
339 | { \ | |
340 | return nullb_device_##TYPE##_attr_show( \ | |
341 | to_nullb_device(item)->NAME, page); \ | |
342 | } \ | |
343 | static ssize_t \ | |
344 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
345 | size_t count) \ | |
346 | { \ | |
347 | int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ | |
348 | struct nullb_device *dev = to_nullb_device(item); \ | |
b9853b4d | 349 | TYPE new_value = 0; \ |
ca0a95a6 AM |
350 | int ret; \ |
351 | \ | |
352 | ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ | |
353 | if (ret < 0) \ | |
354 | return ret; \ | |
355 | if (apply_fn) \ | |
356 | ret = apply_fn(dev, new_value); \ | |
357 | else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \ | |
358 | ret = -EBUSY; \ | |
359 | if (ret < 0) \ | |
360 | return ret; \ | |
361 | dev->NAME = new_value; \ | |
362 | return count; \ | |
363 | } \ | |
3bf2bd20 SL |
364 | CONFIGFS_ATTR(nullb_device_, NAME); |
365 | ||
15dfc662 SK |
366 | static int nullb_update_nr_hw_queues(struct nullb_device *dev, |
367 | unsigned int submit_queues, | |
368 | unsigned int poll_queues) | |
369 | ||
45919fbf | 370 | { |
45919fbf | 371 | struct blk_mq_tag_set *set; |
15dfc662 | 372 | int ret, nr_hw_queues; |
45919fbf | 373 | |
15dfc662 | 374 | if (!dev->nullb) |
45919fbf BVA |
375 | return 0; |
376 | ||
15dfc662 | 377 | /* |
2bfdbe8b | 378 | * Make sure at least one submit queue exists. |
15dfc662 | 379 | */ |
2bfdbe8b | 380 | if (!submit_queues) |
15dfc662 SK |
381 | return -EINVAL; |
382 | ||
78b10be2 BVA |
383 | /* |
384 | * Make sure that null_init_hctx() does not access nullb->queues[] past | |
385 | * the end of that array. | |
386 | */ | |
15dfc662 | 387 | if (submit_queues > nr_cpu_ids || poll_queues > g_poll_queues) |
78b10be2 | 388 | return -EINVAL; |
15dfc662 SK |
389 | |
390 | /* | |
391 | * Keep previous and new queue numbers in nullb_device for reference in | |
392 | * the call back function null_map_queues(). | |
393 | */ | |
394 | dev->prev_submit_queues = dev->submit_queues; | |
395 | dev->prev_poll_queues = dev->poll_queues; | |
396 | dev->submit_queues = submit_queues; | |
397 | dev->poll_queues = poll_queues; | |
398 | ||
399 | set = dev->nullb->tag_set; | |
400 | nr_hw_queues = submit_queues + poll_queues; | |
401 | blk_mq_update_nr_hw_queues(set, nr_hw_queues); | |
402 | ret = set->nr_hw_queues == nr_hw_queues ? 0 : -ENOMEM; | |
403 | ||
404 | if (ret) { | |
405 | /* on error, revert the queue numbers */ | |
406 | dev->submit_queues = dev->prev_submit_queues; | |
407 | dev->poll_queues = dev->prev_poll_queues; | |
408 | } | |
409 | ||
410 | return ret; | |
411 | } | |
412 | ||
413 | static int nullb_apply_submit_queues(struct nullb_device *dev, | |
414 | unsigned int submit_queues) | |
415 | { | |
a2db328b YK |
416 | int ret; |
417 | ||
418 | mutex_lock(&lock); | |
419 | ret = nullb_update_nr_hw_queues(dev, submit_queues, dev->poll_queues); | |
420 | mutex_unlock(&lock); | |
421 | ||
422 | return ret; | |
15dfc662 SK |
423 | } |
424 | ||
425 | static int nullb_apply_poll_queues(struct nullb_device *dev, | |
426 | unsigned int poll_queues) | |
427 | { | |
a2db328b YK |
428 | int ret; |
429 | ||
430 | mutex_lock(&lock); | |
431 | ret = nullb_update_nr_hw_queues(dev, dev->submit_queues, poll_queues); | |
432 | mutex_unlock(&lock); | |
433 | ||
434 | return ret; | |
45919fbf BVA |
435 | } |
436 | ||
437 | NULLB_DEVICE_ATTR(size, ulong, NULL); | |
438 | NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL); | |
439 | NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues); | |
15dfc662 | 440 | NULLB_DEVICE_ATTR(poll_queues, uint, nullb_apply_poll_queues); |
45919fbf BVA |
441 | NULLB_DEVICE_ATTR(home_node, uint, NULL); |
442 | NULLB_DEVICE_ATTR(queue_mode, uint, NULL); | |
443 | NULLB_DEVICE_ATTR(blocksize, uint, NULL); | |
ea17fd35 | 444 | NULLB_DEVICE_ATTR(max_sectors, uint, NULL); |
45919fbf BVA |
445 | NULLB_DEVICE_ATTR(irqmode, uint, NULL); |
446 | NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); | |
447 | NULLB_DEVICE_ATTR(index, uint, NULL); | |
448 | NULLB_DEVICE_ATTR(blocking, bool, NULL); | |
449 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL); | |
450 | NULLB_DEVICE_ATTR(memory_backed, bool, NULL); | |
451 | NULLB_DEVICE_ATTR(discard, bool, NULL); | |
452 | NULLB_DEVICE_ATTR(mbps, uint, NULL); | |
453 | NULLB_DEVICE_ATTR(cache_size, ulong, NULL); | |
454 | NULLB_DEVICE_ATTR(zoned, bool, NULL); | |
455 | NULLB_DEVICE_ATTR(zone_size, ulong, NULL); | |
089565fb | 456 | NULLB_DEVICE_ATTR(zone_capacity, ulong, NULL); |
45919fbf | 457 | NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL); |
dc4d137e NC |
458 | NULLB_DEVICE_ATTR(zone_max_open, uint, NULL); |
459 | NULLB_DEVICE_ATTR(zone_max_active, uint, NULL); | |
997a1f08 | 460 | NULLB_DEVICE_ATTR(zone_append_max_sectors, uint, NULL); |
cee1b215 | 461 | NULLB_DEVICE_ATTR(virt_boundary, bool, NULL); |
7012eef5 | 462 | NULLB_DEVICE_ATTR(no_sched, bool, NULL); |
14509b74 | 463 | NULLB_DEVICE_ATTR(shared_tags, bool, NULL); |
7012eef5 | 464 | NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL); |
f4f84586 | 465 | NULLB_DEVICE_ATTR(fua, bool, NULL); |
3bf2bd20 | 466 | |
cedcafad SL |
467 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
468 | { | |
469 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
470 | } | |
471 | ||
472 | static ssize_t nullb_device_power_store(struct config_item *item, | |
473 | const char *page, size_t count) | |
474 | { | |
475 | struct nullb_device *dev = to_nullb_device(item); | |
476 | bool newp = false; | |
477 | ssize_t ret; | |
478 | ||
479 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
480 | if (ret < 0) | |
481 | return ret; | |
482 | ||
a2db328b YK |
483 | ret = count; |
484 | mutex_lock(&lock); | |
cedcafad SL |
485 | if (!dev->power && newp) { |
486 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
a2db328b YK |
487 | goto out; |
488 | ||
a75110c3 CK |
489 | ret = null_add_dev(dev); |
490 | if (ret) { | |
cedcafad | 491 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); |
a2db328b | 492 | goto out; |
cedcafad SL |
493 | } |
494 | ||
495 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
496 | dev->power = newp; | |
b3c30512 | 497 | } else if (dev->power && !newp) { |
7602843f | 498 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
7602843f BL |
499 | dev->power = newp; |
500 | null_del_dev(dev->nullb); | |
7602843f | 501 | } |
00a8cdb8 | 502 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
503 | } |
504 | ||
a2db328b YK |
505 | out: |
506 | mutex_unlock(&lock); | |
507 | return ret; | |
cedcafad SL |
508 | } |
509 | ||
510 | CONFIGFS_ATTR(nullb_device_, power); | |
511 | ||
2f54a613 SL |
512 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
513 | { | |
514 | struct nullb_device *t_dev = to_nullb_device(item); | |
515 | ||
516 | return badblocks_show(&t_dev->badblocks, page, 0); | |
517 | } | |
518 | ||
519 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
520 | const char *page, size_t count) | |
521 | { | |
522 | struct nullb_device *t_dev = to_nullb_device(item); | |
523 | char *orig, *buf, *tmp; | |
524 | u64 start, end; | |
525 | int ret; | |
526 | ||
527 | orig = kstrndup(page, count, GFP_KERNEL); | |
528 | if (!orig) | |
529 | return -ENOMEM; | |
530 | ||
531 | buf = strstrip(orig); | |
532 | ||
533 | ret = -EINVAL; | |
534 | if (buf[0] != '+' && buf[0] != '-') | |
535 | goto out; | |
536 | tmp = strchr(&buf[1], '-'); | |
537 | if (!tmp) | |
538 | goto out; | |
539 | *tmp = '\0'; | |
540 | ret = kstrtoull(buf + 1, 0, &start); | |
541 | if (ret) | |
542 | goto out; | |
543 | ret = kstrtoull(tmp + 1, 0, &end); | |
544 | if (ret) | |
545 | goto out; | |
546 | ret = -EINVAL; | |
547 | if (start > end) | |
548 | goto out; | |
549 | /* enable badblocks */ | |
550 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
551 | if (buf[0] == '+') | |
552 | ret = badblocks_set(&t_dev->badblocks, start, | |
553 | end - start + 1, 1); | |
554 | else | |
555 | ret = badblocks_clear(&t_dev->badblocks, start, | |
556 | end - start + 1); | |
557 | if (ret == 0) | |
558 | ret = count; | |
559 | out: | |
560 | kfree(orig); | |
561 | return ret; | |
562 | } | |
563 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
564 | ||
d3a57388 SK |
565 | static ssize_t nullb_device_zone_readonly_store(struct config_item *item, |
566 | const char *page, size_t count) | |
567 | { | |
568 | struct nullb_device *dev = to_nullb_device(item); | |
569 | ||
570 | return zone_cond_store(dev, page, count, BLK_ZONE_COND_READONLY); | |
571 | } | |
572 | CONFIGFS_ATTR_WO(nullb_device_, zone_readonly); | |
573 | ||
574 | static ssize_t nullb_device_zone_offline_store(struct config_item *item, | |
575 | const char *page, size_t count) | |
576 | { | |
577 | struct nullb_device *dev = to_nullb_device(item); | |
578 | ||
579 | return zone_cond_store(dev, page, count, BLK_ZONE_COND_OFFLINE); | |
580 | } | |
581 | CONFIGFS_ATTR_WO(nullb_device_, zone_offline); | |
582 | ||
3bf2bd20 SL |
583 | static struct configfs_attribute *nullb_device_attrs[] = { |
584 | &nullb_device_attr_size, | |
585 | &nullb_device_attr_completion_nsec, | |
586 | &nullb_device_attr_submit_queues, | |
0a593fbb | 587 | &nullb_device_attr_poll_queues, |
3bf2bd20 SL |
588 | &nullb_device_attr_home_node, |
589 | &nullb_device_attr_queue_mode, | |
590 | &nullb_device_attr_blocksize, | |
ea17fd35 | 591 | &nullb_device_attr_max_sectors, |
3bf2bd20 SL |
592 | &nullb_device_attr_irqmode, |
593 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 594 | &nullb_device_attr_index, |
3bf2bd20 SL |
595 | &nullb_device_attr_blocking, |
596 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 597 | &nullb_device_attr_power, |
5bcd0e0c | 598 | &nullb_device_attr_memory_backed, |
306eb6b4 | 599 | &nullb_device_attr_discard, |
eff2c4f1 | 600 | &nullb_device_attr_mbps, |
deb78b41 | 601 | &nullb_device_attr_cache_size, |
2f54a613 | 602 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
603 | &nullb_device_attr_zoned, |
604 | &nullb_device_attr_zone_size, | |
089565fb | 605 | &nullb_device_attr_zone_capacity, |
ea2c18e1 | 606 | &nullb_device_attr_zone_nr_conv, |
dc4d137e NC |
607 | &nullb_device_attr_zone_max_open, |
608 | &nullb_device_attr_zone_max_active, | |
997a1f08 | 609 | &nullb_device_attr_zone_append_max_sectors, |
d3a57388 SK |
610 | &nullb_device_attr_zone_readonly, |
611 | &nullb_device_attr_zone_offline, | |
cee1b215 | 612 | &nullb_device_attr_virt_boundary, |
7012eef5 | 613 | &nullb_device_attr_no_sched, |
14509b74 | 614 | &nullb_device_attr_shared_tags, |
7012eef5 | 615 | &nullb_device_attr_shared_tag_bitmap, |
f4f84586 | 616 | &nullb_device_attr_fua, |
3bf2bd20 SL |
617 | NULL, |
618 | }; | |
619 | ||
620 | static void nullb_device_release(struct config_item *item) | |
621 | { | |
5bcd0e0c SL |
622 | struct nullb_device *dev = to_nullb_device(item); |
623 | ||
deb78b41 | 624 | null_free_device_storage(dev, false); |
5bcd0e0c | 625 | null_free_dev(dev); |
3bf2bd20 SL |
626 | } |
627 | ||
628 | static struct configfs_item_operations nullb_device_ops = { | |
629 | .release = nullb_device_release, | |
630 | }; | |
631 | ||
e1919dff | 632 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
633 | .ct_item_ops = &nullb_device_ops, |
634 | .ct_attrs = nullb_device_attrs, | |
635 | .ct_owner = THIS_MODULE, | |
636 | }; | |
637 | ||
bb4c19e0 AM |
638 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
639 | ||
640 | static void nullb_add_fault_config(struct nullb_device *dev) | |
641 | { | |
642 | fault_config_init(&dev->timeout_config, "timeout_inject"); | |
643 | fault_config_init(&dev->requeue_config, "requeue_inject"); | |
644 | fault_config_init(&dev->init_hctx_fault_config, "init_hctx_fault_inject"); | |
645 | ||
646 | configfs_add_default_group(&dev->timeout_config.group, &dev->group); | |
647 | configfs_add_default_group(&dev->requeue_config.group, &dev->group); | |
648 | configfs_add_default_group(&dev->init_hctx_fault_config.group, &dev->group); | |
649 | } | |
650 | ||
651 | #else | |
652 | ||
653 | static void nullb_add_fault_config(struct nullb_device *dev) | |
654 | { | |
655 | } | |
656 | ||
657 | #endif | |
658 | ||
3bf2bd20 | 659 | static struct |
bb4c19e0 | 660 | config_group *nullb_group_make_group(struct config_group *group, const char *name) |
3bf2bd20 SL |
661 | { |
662 | struct nullb_device *dev; | |
663 | ||
49c3b926 DLM |
664 | if (null_find_dev_by_name(name)) |
665 | return ERR_PTR(-EEXIST); | |
666 | ||
3bf2bd20 SL |
667 | dev = null_alloc_dev(); |
668 | if (!dev) | |
669 | return ERR_PTR(-ENOMEM); | |
670 | ||
bb4c19e0 AM |
671 | config_group_init_type_name(&dev->group, name, &nullb_device_type); |
672 | nullb_add_fault_config(dev); | |
3bf2bd20 | 673 | |
bb4c19e0 | 674 | return &dev->group; |
3bf2bd20 SL |
675 | } |
676 | ||
677 | static void | |
678 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
679 | { | |
cedcafad SL |
680 | struct nullb_device *dev = to_nullb_device(item); |
681 | ||
682 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
683 | mutex_lock(&lock); | |
684 | dev->power = false; | |
685 | null_del_dev(dev->nullb); | |
686 | mutex_unlock(&lock); | |
687 | } | |
688 | ||
3bf2bd20 SL |
689 | config_item_put(item); |
690 | } | |
691 | ||
692 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
693 | { | |
089565fb | 694 | return snprintf(page, PAGE_SIZE, |
f4f84586 | 695 | "badblocks,blocking,blocksize,cache_size,fua," |
7012eef5 VF |
696 | "completion_nsec,discard,home_node,hw_queue_depth," |
697 | "irqmode,max_sectors,mbps,memory_backed,no_sched," | |
14509b74 SK |
698 | "poll_queues,power,queue_mode,shared_tag_bitmap," |
699 | "shared_tags,size,submit_queues,use_per_node_hctx," | |
700 | "virt_boundary,zoned,zone_capacity,zone_max_active," | |
701 | "zone_max_open,zone_nr_conv,zone_offline,zone_readonly," | |
997a1f08 | 702 | "zone_size,zone_append_max_sectors\n"); |
3bf2bd20 SL |
703 | } |
704 | ||
705 | CONFIGFS_ATTR_RO(memb_group_, features); | |
706 | ||
707 | static struct configfs_attribute *nullb_group_attrs[] = { | |
708 | &memb_group_attr_features, | |
709 | NULL, | |
710 | }; | |
711 | ||
712 | static struct configfs_group_operations nullb_group_ops = { | |
bb4c19e0 | 713 | .make_group = nullb_group_make_group, |
3bf2bd20 SL |
714 | .drop_item = nullb_group_drop_item, |
715 | }; | |
716 | ||
e1919dff | 717 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
718 | .ct_group_ops = &nullb_group_ops, |
719 | .ct_attrs = nullb_group_attrs, | |
720 | .ct_owner = THIS_MODULE, | |
721 | }; | |
722 | ||
723 | static struct configfs_subsystem nullb_subsys = { | |
724 | .su_group = { | |
725 | .cg_item = { | |
726 | .ci_namebuf = "nullb", | |
727 | .ci_type = &nullb_group_type, | |
728 | }, | |
729 | }, | |
730 | }; | |
731 | ||
deb78b41 SL |
732 | static inline int null_cache_active(struct nullb *nullb) |
733 | { | |
734 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
735 | } | |
736 | ||
2984c868 SL |
737 | static struct nullb_device *null_alloc_dev(void) |
738 | { | |
739 | struct nullb_device *dev; | |
740 | ||
741 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
742 | if (!dev) | |
743 | return NULL; | |
bb4c19e0 AM |
744 | |
745 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
746 | dev->timeout_config.attr = null_timeout_attr; | |
747 | dev->requeue_config.attr = null_requeue_attr; | |
748 | dev->init_hctx_fault_config.attr = null_init_hctx_attr; | |
749 | #endif | |
750 | ||
5bcd0e0c | 751 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 752 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
753 | if (badblocks_init(&dev->badblocks, 0)) { |
754 | kfree(dev); | |
755 | return NULL; | |
756 | } | |
757 | ||
2984c868 SL |
758 | dev->size = g_gb * 1024; |
759 | dev->completion_nsec = g_completion_nsec; | |
760 | dev->submit_queues = g_submit_queues; | |
15dfc662 | 761 | dev->prev_submit_queues = g_submit_queues; |
0a593fbb | 762 | dev->poll_queues = g_poll_queues; |
15dfc662 | 763 | dev->prev_poll_queues = g_poll_queues; |
2984c868 SL |
764 | dev->home_node = g_home_node; |
765 | dev->queue_mode = g_queue_mode; | |
766 | dev->blocksize = g_bs; | |
ea17fd35 | 767 | dev->max_sectors = g_max_sectors; |
2984c868 SL |
768 | dev->irqmode = g_irqmode; |
769 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 | 770 | dev->blocking = g_blocking; |
058efe00 VF |
771 | dev->memory_backed = g_memory_backed; |
772 | dev->discard = g_discard; | |
773 | dev->cache_size = g_cache_size; | |
774 | dev->mbps = g_mbps; | |
2984c868 | 775 | dev->use_per_node_hctx = g_use_per_node_hctx; |
ca4b2a01 MB |
776 | dev->zoned = g_zoned; |
777 | dev->zone_size = g_zone_size; | |
089565fb | 778 | dev->zone_capacity = g_zone_capacity; |
ea2c18e1 | 779 | dev->zone_nr_conv = g_zone_nr_conv; |
dc4d137e NC |
780 | dev->zone_max_open = g_zone_max_open; |
781 | dev->zone_max_active = g_zone_max_active; | |
997a1f08 | 782 | dev->zone_append_max_sectors = g_zone_append_max_sectors; |
cee1b215 | 783 | dev->virt_boundary = g_virt_boundary; |
7012eef5 | 784 | dev->no_sched = g_no_sched; |
14509b74 | 785 | dev->shared_tags = g_shared_tags; |
7012eef5 | 786 | dev->shared_tag_bitmap = g_shared_tag_bitmap; |
f4f84586 DLM |
787 | dev->fua = g_fua; |
788 | ||
2984c868 SL |
789 | return dev; |
790 | } | |
791 | ||
792 | static void null_free_dev(struct nullb_device *dev) | |
793 | { | |
1addb798 DD |
794 | if (!dev) |
795 | return; | |
796 | ||
d205bde7 | 797 | null_free_zoned_dev(dev); |
1addb798 | 798 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
799 | kfree(dev); |
800 | } | |
801 | ||
cf8ecc5a AA |
802 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) |
803 | { | |
8b631f9c | 804 | struct nullb_cmd *cmd = container_of(timer, struct nullb_cmd, timer); |
f2298c04 | 805 | |
8b631f9c | 806 | blk_mq_end_request(blk_mq_rq_from_pdu(cmd), cmd->error); |
f2298c04 JA |
807 | return HRTIMER_NORESTART; |
808 | } | |
809 | ||
810 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
811 | { | |
2984c868 | 812 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 813 | |
3c395a96 | 814 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
815 | } |
816 | ||
49f66136 | 817 | static void null_complete_rq(struct request *rq) |
f2298c04 | 818 | { |
8b631f9c CH |
819 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); |
820 | ||
821 | blk_mq_end_request(rq, cmd->error); | |
f2298c04 JA |
822 | } |
823 | ||
c90b6b50 | 824 | static struct nullb_page *null_alloc_page(void) |
5bcd0e0c SL |
825 | { |
826 | struct nullb_page *t_page; | |
827 | ||
c90b6b50 | 828 | t_page = kmalloc(sizeof(struct nullb_page), GFP_NOIO); |
5bcd0e0c | 829 | if (!t_page) |
df00b1d2 | 830 | return NULL; |
5bcd0e0c | 831 | |
c90b6b50 | 832 | t_page->page = alloc_pages(GFP_NOIO, 0); |
df00b1d2 CK |
833 | if (!t_page->page) { |
834 | kfree(t_page); | |
835 | return NULL; | |
836 | } | |
5bcd0e0c | 837 | |
66231ad3 | 838 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c | 839 | return t_page; |
5bcd0e0c SL |
840 | } |
841 | ||
842 | static void null_free_page(struct nullb_page *t_page) | |
843 | { | |
66231ad3 ML |
844 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
845 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 846 | return; |
5bcd0e0c SL |
847 | __free_page(t_page->page); |
848 | kfree(t_page); | |
849 | } | |
850 | ||
66231ad3 ML |
851 | static bool null_page_empty(struct nullb_page *page) |
852 | { | |
853 | int size = MAP_SZ - 2; | |
854 | ||
855 | return find_first_bit(page->bitmap, size) == size; | |
856 | } | |
857 | ||
deb78b41 SL |
858 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
859 | bool is_cache) | |
5bcd0e0c SL |
860 | { |
861 | unsigned int sector_bit; | |
862 | u64 idx; | |
863 | struct nullb_page *t_page, *ret; | |
864 | struct radix_tree_root *root; | |
865 | ||
deb78b41 | 866 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
867 | idx = sector >> PAGE_SECTORS_SHIFT; |
868 | sector_bit = (sector & SECTOR_MASK); | |
869 | ||
870 | t_page = radix_tree_lookup(root, idx); | |
871 | if (t_page) { | |
66231ad3 | 872 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 873 | |
66231ad3 | 874 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
875 | ret = radix_tree_delete_item(root, idx, t_page); |
876 | WARN_ON(ret != t_page); | |
877 | null_free_page(ret); | |
deb78b41 SL |
878 | if (is_cache) |
879 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
880 | } |
881 | } | |
882 | } | |
883 | ||
884 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 885 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
886 | { |
887 | struct radix_tree_root *root; | |
888 | ||
deb78b41 | 889 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
890 | |
891 | if (radix_tree_insert(root, idx, t_page)) { | |
892 | null_free_page(t_page); | |
893 | t_page = radix_tree_lookup(root, idx); | |
894 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
895 | } else if (is_cache) |
896 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
897 | |
898 | return t_page; | |
899 | } | |
900 | ||
deb78b41 | 901 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
902 | { |
903 | unsigned long pos = 0; | |
904 | int nr_pages; | |
905 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
906 | struct radix_tree_root *root; | |
907 | ||
deb78b41 | 908 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
909 | |
910 | do { | |
911 | int i; | |
912 | ||
913 | nr_pages = radix_tree_gang_lookup(root, | |
914 | (void **)t_pages, pos, FREE_BATCH); | |
915 | ||
916 | for (i = 0; i < nr_pages; i++) { | |
917 | pos = t_pages[i]->page->index; | |
918 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
919 | WARN_ON(ret != t_pages[i]); | |
920 | null_free_page(ret); | |
921 | } | |
922 | ||
923 | pos++; | |
924 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
925 | |
926 | if (is_cache) | |
927 | dev->curr_cache = 0; | |
5bcd0e0c SL |
928 | } |
929 | ||
deb78b41 SL |
930 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
931 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
932 | { |
933 | unsigned int sector_bit; | |
934 | u64 idx; | |
935 | struct nullb_page *t_page; | |
deb78b41 | 936 | struct radix_tree_root *root; |
5bcd0e0c SL |
937 | |
938 | idx = sector >> PAGE_SECTORS_SHIFT; | |
939 | sector_bit = (sector & SECTOR_MASK); | |
940 | ||
deb78b41 SL |
941 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
942 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
943 | WARN_ON(t_page && t_page->page->index != idx); |
944 | ||
66231ad3 | 945 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
946 | return t_page; |
947 | ||
948 | return NULL; | |
949 | } | |
950 | ||
deb78b41 SL |
951 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
952 | sector_t sector, bool for_write, bool ignore_cache) | |
953 | { | |
954 | struct nullb_page *page = NULL; | |
955 | ||
956 | if (!ignore_cache) | |
957 | page = __null_lookup_page(nullb, sector, for_write, true); | |
958 | if (page) | |
959 | return page; | |
960 | return __null_lookup_page(nullb, sector, for_write, false); | |
961 | } | |
962 | ||
5bcd0e0c | 963 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
964 | sector_t sector, bool ignore_cache) |
965 | __releases(&nullb->lock) | |
966 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
967 | { |
968 | u64 idx; | |
969 | struct nullb_page *t_page; | |
970 | ||
deb78b41 | 971 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
972 | if (t_page) |
973 | return t_page; | |
974 | ||
975 | spin_unlock_irq(&nullb->lock); | |
976 | ||
c90b6b50 | 977 | t_page = null_alloc_page(); |
5bcd0e0c SL |
978 | if (!t_page) |
979 | goto out_lock; | |
980 | ||
981 | if (radix_tree_preload(GFP_NOIO)) | |
982 | goto out_freepage; | |
983 | ||
984 | spin_lock_irq(&nullb->lock); | |
985 | idx = sector >> PAGE_SECTORS_SHIFT; | |
986 | t_page->page->index = idx; | |
deb78b41 | 987 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
988 | radix_tree_preload_end(); |
989 | ||
990 | return t_page; | |
991 | out_freepage: | |
992 | null_free_page(t_page); | |
993 | out_lock: | |
994 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
995 | return null_lookup_page(nullb, sector, true, ignore_cache); |
996 | } | |
997 | ||
998 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
999 | { | |
1000 | int i; | |
1001 | unsigned int offset; | |
1002 | u64 idx; | |
1003 | struct nullb_page *t_page, *ret; | |
1004 | void *dst, *src; | |
1005 | ||
1006 | idx = c_page->page->index; | |
1007 | ||
1008 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
1009 | ||
66231ad3 ML |
1010 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
1011 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 1012 | null_free_page(c_page); |
66231ad3 | 1013 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
1014 | ret = radix_tree_delete_item(&nullb->dev->data, |
1015 | idx, t_page); | |
1016 | null_free_page(t_page); | |
1017 | } | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | if (!t_page) | |
1022 | return -ENOMEM; | |
1023 | ||
acc3c879 CK |
1024 | src = kmap_local_page(c_page->page); |
1025 | dst = kmap_local_page(t_page->page); | |
deb78b41 SL |
1026 | |
1027 | for (i = 0; i < PAGE_SECTORS; | |
1028 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 1029 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
1030 | offset = (i << SECTOR_SHIFT); |
1031 | memcpy(dst + offset, src + offset, | |
1032 | nullb->dev->blocksize); | |
66231ad3 | 1033 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
1034 | } |
1035 | } | |
1036 | ||
acc3c879 CK |
1037 | kunmap_local(dst); |
1038 | kunmap_local(src); | |
deb78b41 SL |
1039 | |
1040 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
1041 | null_free_page(ret); | |
1042 | nullb->dev->curr_cache -= PAGE_SIZE; | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 1048 | { |
deb78b41 SL |
1049 | int i, err, nr_pages; |
1050 | struct nullb_page *c_pages[FREE_BATCH]; | |
1051 | unsigned long flushed = 0, one_round; | |
1052 | ||
1053 | again: | |
1054 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
1055 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
1056 | return 0; | |
1057 | ||
1058 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
1059 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
1060 | /* | |
1061 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
1062 | * avoid race, we don't allow page free | |
1063 | */ | |
1064 | for (i = 0; i < nr_pages; i++) { | |
1065 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
1066 | /* | |
1067 | * We found the page which is being flushed to disk by other | |
1068 | * threads | |
1069 | */ | |
66231ad3 | 1070 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
1071 | c_pages[i] = NULL; |
1072 | else | |
66231ad3 | 1073 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
1074 | } |
1075 | ||
1076 | one_round = 0; | |
1077 | for (i = 0; i < nr_pages; i++) { | |
1078 | if (c_pages[i] == NULL) | |
1079 | continue; | |
1080 | err = null_flush_cache_page(nullb, c_pages[i]); | |
1081 | if (err) | |
1082 | return err; | |
1083 | one_round++; | |
1084 | } | |
1085 | flushed += one_round << PAGE_SHIFT; | |
1086 | ||
1087 | if (n > flushed) { | |
1088 | if (nr_pages == 0) | |
1089 | nullb->cache_flush_pos = 0; | |
1090 | if (one_round == 0) { | |
1091 | /* give other threads a chance */ | |
1092 | spin_unlock_irq(&nullb->lock); | |
1093 | spin_lock_irq(&nullb->lock); | |
1094 | } | |
1095 | goto again; | |
1096 | } | |
1097 | return 0; | |
5bcd0e0c SL |
1098 | } |
1099 | ||
1100 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 1101 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
1102 | { |
1103 | size_t temp, count = 0; | |
1104 | unsigned int offset; | |
1105 | struct nullb_page *t_page; | |
5bcd0e0c SL |
1106 | |
1107 | while (count < n) { | |
1108 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1109 | ||
deb78b41 SL |
1110 | if (null_cache_active(nullb) && !is_fua) |
1111 | null_make_cache_space(nullb, PAGE_SIZE); | |
1112 | ||
5bcd0e0c | 1113 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
1114 | t_page = null_insert_page(nullb, sector, |
1115 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
1116 | if (!t_page) |
1117 | return -ENOSPC; | |
1118 | ||
fbb5615f | 1119 | memcpy_page(t_page->page, offset, source, off + count, temp); |
5bcd0e0c | 1120 | |
66231ad3 | 1121 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 1122 | |
deb78b41 SL |
1123 | if (is_fua) |
1124 | null_free_sector(nullb, sector, true); | |
1125 | ||
5bcd0e0c SL |
1126 | count += temp; |
1127 | sector += temp >> SECTOR_SHIFT; | |
1128 | } | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1133 | unsigned int off, sector_t sector, size_t n) | |
1134 | { | |
1135 | size_t temp, count = 0; | |
1136 | unsigned int offset; | |
1137 | struct nullb_page *t_page; | |
5bcd0e0c SL |
1138 | |
1139 | while (count < n) { | |
1140 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1141 | ||
1142 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1143 | t_page = null_lookup_page(nullb, sector, false, |
1144 | !null_cache_active(nullb)); | |
5bcd0e0c | 1145 | |
fbb5615f CK |
1146 | if (t_page) |
1147 | memcpy_page(dest, off + count, t_page->page, offset, | |
1148 | temp); | |
1149 | else | |
1150 | zero_user(dest, off + count, temp); | |
5bcd0e0c SL |
1151 | |
1152 | count += temp; | |
1153 | sector += temp >> SECTOR_SHIFT; | |
1154 | } | |
1155 | return 0; | |
1156 | } | |
1157 | ||
dd85b492 AJ |
1158 | static void nullb_fill_pattern(struct nullb *nullb, struct page *page, |
1159 | unsigned int len, unsigned int off) | |
1160 | { | |
fbb5615f | 1161 | memset_page(page, off, 0xff, len); |
dd85b492 AJ |
1162 | } |
1163 | ||
0ec4d913 DLM |
1164 | blk_status_t null_handle_discard(struct nullb_device *dev, |
1165 | sector_t sector, sector_t nr_sectors) | |
306eb6b4 | 1166 | { |
49c7089f DLM |
1167 | struct nullb *nullb = dev->nullb; |
1168 | size_t n = nr_sectors << SECTOR_SHIFT; | |
306eb6b4 SL |
1169 | size_t temp; |
1170 | ||
1171 | spin_lock_irq(&nullb->lock); | |
1172 | while (n > 0) { | |
49c7089f | 1173 | temp = min_t(size_t, n, dev->blocksize); |
deb78b41 SL |
1174 | null_free_sector(nullb, sector, false); |
1175 | if (null_cache_active(nullb)) | |
1176 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1177 | sector += temp >> SECTOR_SHIFT; |
1178 | n -= temp; | |
1179 | } | |
1180 | spin_unlock_irq(&nullb->lock); | |
49c7089f DLM |
1181 | |
1182 | return BLK_STS_OK; | |
306eb6b4 SL |
1183 | } |
1184 | ||
cb9e5273 | 1185 | static blk_status_t null_handle_flush(struct nullb *nullb) |
deb78b41 SL |
1186 | { |
1187 | int err; | |
1188 | ||
1189 | if (!null_cache_active(nullb)) | |
1190 | return 0; | |
1191 | ||
1192 | spin_lock_irq(&nullb->lock); | |
1193 | while (true) { | |
1194 | err = null_make_cache_space(nullb, | |
1195 | nullb->dev->cache_size * 1024 * 1024); | |
1196 | if (err || nullb->dev->curr_cache == 0) | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1201 | spin_unlock_irq(&nullb->lock); | |
cb9e5273 | 1202 | return errno_to_blk_status(err); |
deb78b41 SL |
1203 | } |
1204 | ||
5bcd0e0c | 1205 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1206 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1207 | bool is_fua) | |
f2298c04 | 1208 | { |
dd85b492 AJ |
1209 | struct nullb_device *dev = nullb->dev; |
1210 | unsigned int valid_len = len; | |
5bcd0e0c SL |
1211 | int err = 0; |
1212 | ||
1213 | if (!is_write) { | |
dd85b492 AJ |
1214 | if (dev->zoned) |
1215 | valid_len = null_zone_valid_read_len(nullb, | |
1216 | sector, len); | |
1217 | ||
1218 | if (valid_len) { | |
1219 | err = copy_from_nullb(nullb, page, off, | |
1220 | sector, valid_len); | |
1221 | off += valid_len; | |
1222 | len -= valid_len; | |
1223 | } | |
1224 | ||
1225 | if (len) | |
1226 | nullb_fill_pattern(nullb, page, len, off); | |
5bcd0e0c SL |
1227 | flush_dcache_page(page); |
1228 | } else { | |
1229 | flush_dcache_page(page); | |
deb78b41 | 1230 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1231 | } |
1232 | ||
1233 | return err; | |
1234 | } | |
1235 | ||
25260555 | 1236 | static blk_status_t null_handle_rq(struct nullb_cmd *cmd) |
5bcd0e0c | 1237 | { |
8b631f9c | 1238 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
5bcd0e0c | 1239 | struct nullb *nullb = cmd->nq->dev->nullb; |
cb9e5273 | 1240 | int err = 0; |
5bcd0e0c | 1241 | unsigned int len; |
49c7089f | 1242 | sector_t sector = blk_rq_pos(rq); |
5bcd0e0c SL |
1243 | struct req_iterator iter; |
1244 | struct bio_vec bvec; | |
1245 | ||
5bcd0e0c SL |
1246 | spin_lock_irq(&nullb->lock); |
1247 | rq_for_each_segment(bvec, rq, iter) { | |
1248 | len = bvec.bv_len; | |
1249 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1250 | op_is_write(req_op(rq)), sector, |
2d62e6b0 | 1251 | rq->cmd_flags & REQ_FUA); |
cb9e5273 DLM |
1252 | if (err) |
1253 | break; | |
5bcd0e0c SL |
1254 | sector += len >> SECTOR_SHIFT; |
1255 | } | |
1256 | spin_unlock_irq(&nullb->lock); | |
1257 | ||
cb9e5273 | 1258 | return errno_to_blk_status(err); |
5bcd0e0c SL |
1259 | } |
1260 | ||
adb84284 CK |
1261 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
1262 | { | |
1263 | struct nullb_device *dev = cmd->nq->dev; | |
1264 | struct nullb *nullb = dev->nullb; | |
1265 | blk_status_t sts = BLK_STS_OK; | |
8b631f9c | 1266 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
adb84284 CK |
1267 | |
1268 | if (!hrtimer_active(&nullb->bw_timer)) | |
1269 | hrtimer_restart(&nullb->bw_timer); | |
1270 | ||
1271 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { | |
8b631f9c | 1272 | blk_mq_stop_hw_queues(nullb->q); |
adb84284 CK |
1273 | /* race with timer */ |
1274 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
8b631f9c | 1275 | blk_mq_start_stopped_hw_queues(nullb->q, true); |
adb84284 CK |
1276 | /* requeue request */ |
1277 | sts = BLK_STS_DEV_RESOURCE; | |
1278 | } | |
1279 | return sts; | |
1280 | } | |
1281 | ||
8f94d1c1 CK |
1282 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
1283 | sector_t sector, | |
1284 | sector_t nr_sectors) | |
1285 | { | |
1286 | struct badblocks *bb = &cmd->nq->dev->badblocks; | |
1287 | sector_t first_bad; | |
1288 | int bad_sectors; | |
1289 | ||
1290 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) | |
1291 | return BLK_STS_IOERR; | |
1292 | ||
1293 | return BLK_STS_OK; | |
1294 | } | |
1295 | ||
7ea88e22 | 1296 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
ff07a02e | 1297 | enum req_op op, |
49c7089f DLM |
1298 | sector_t sector, |
1299 | sector_t nr_sectors) | |
7ea88e22 CK |
1300 | { |
1301 | struct nullb_device *dev = cmd->nq->dev; | |
7ea88e22 | 1302 | |
49c7089f DLM |
1303 | if (op == REQ_OP_DISCARD) |
1304 | return null_handle_discard(dev, sector, nr_sectors); | |
1305 | ||
cb9e5273 | 1306 | return null_handle_rq(cmd); |
7ea88e22 CK |
1307 | } |
1308 | ||
cecbc9ce BVA |
1309 | static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd) |
1310 | { | |
8b631f9c | 1311 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
cecbc9ce BVA |
1312 | struct nullb_device *dev = cmd->nq->dev; |
1313 | struct bio *bio; | |
1314 | ||
8b631f9c CH |
1315 | if (!dev->memory_backed && req_op(rq) == REQ_OP_READ) { |
1316 | __rq_for_each_bio(bio, rq) | |
cecbc9ce BVA |
1317 | zero_fill_bio(bio); |
1318 | } | |
1319 | } | |
1320 | ||
a3d7d674 CK |
1321 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
1322 | { | |
8b631f9c CH |
1323 | struct request *rq = blk_mq_rq_from_pdu(cmd); |
1324 | ||
cecbc9ce BVA |
1325 | /* |
1326 | * Since root privileges are required to configure the null_blk | |
1327 | * driver, it is fine that this driver does not initialize the | |
1328 | * data buffers of read commands. Zero-initialize these buffers | |
1329 | * anyway if KMSAN is enabled to prevent that KMSAN complains | |
1330 | * about null_blk not initializing read data buffers. | |
1331 | */ | |
1332 | if (IS_ENABLED(CONFIG_KMSAN)) | |
1333 | nullb_zero_read_cmd_buffer(cmd); | |
1334 | ||
a3d7d674 CK |
1335 | /* Complete IO by inline, softirq or timer */ |
1336 | switch (cmd->nq->dev->irqmode) { | |
1337 | case NULL_IRQ_SOFTIRQ: | |
8b631f9c | 1338 | blk_mq_complete_request(rq); |
a3d7d674 CK |
1339 | break; |
1340 | case NULL_IRQ_NONE: | |
8b631f9c | 1341 | blk_mq_end_request(rq, cmd->error); |
a3d7d674 CK |
1342 | break; |
1343 | case NULL_IRQ_TIMER: | |
1344 | null_cmd_end_timer(cmd); | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | ||
ff07a02e BVA |
1349 | blk_status_t null_process_cmd(struct nullb_cmd *cmd, enum req_op op, |
1350 | sector_t sector, unsigned int nr_sectors) | |
9dd44c7e DLM |
1351 | { |
1352 | struct nullb_device *dev = cmd->nq->dev; | |
1353 | blk_status_t ret; | |
1354 | ||
1355 | if (dev->badblocks.shift != -1) { | |
1356 | ret = null_handle_badblocks(cmd, sector, nr_sectors); | |
1357 | if (ret != BLK_STS_OK) | |
1358 | return ret; | |
1359 | } | |
1360 | ||
1361 | if (dev->memory_backed) | |
49c7089f | 1362 | return null_handle_memory_backed(cmd, op, sector, nr_sectors); |
9dd44c7e DLM |
1363 | |
1364 | return BLK_STS_OK; | |
1365 | } | |
1366 | ||
53f2bca2 CZ |
1367 | static void null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
1368 | sector_t nr_sectors, enum req_op op) | |
5bcd0e0c SL |
1369 | { |
1370 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1371 | struct nullb *nullb = dev->nullb; |
adb84284 | 1372 | blk_status_t sts; |
5bcd0e0c | 1373 | |
d4b186ed | 1374 | if (op == REQ_OP_FLUSH) { |
cb9e5273 | 1375 | cmd->error = null_handle_flush(nullb); |
d4b186ed CK |
1376 | goto out; |
1377 | } | |
d4b186ed | 1378 | |
9dd44c7e | 1379 | if (dev->zoned) |
de3510e5 | 1380 | sts = null_process_zoned_cmd(cmd, op, sector, nr_sectors); |
9dd44c7e | 1381 | else |
de3510e5 DLM |
1382 | sts = null_process_cmd(cmd, op, sector, nr_sectors); |
1383 | ||
1384 | /* Do not overwrite errors (e.g. timeout errors) */ | |
1385 | if (cmd->error == BLK_STS_OK) | |
1386 | cmd->error = sts; | |
fceb5d1b | 1387 | |
2f54a613 | 1388 | out: |
a3d7d674 | 1389 | nullb_complete_cmd(cmd); |
f2298c04 JA |
1390 | } |
1391 | ||
eff2c4f1 SL |
1392 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1393 | { | |
1394 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1395 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1396 | unsigned int mbps = nullb->dev->mbps; | |
1397 | ||
1398 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1399 | return HRTIMER_NORESTART; | |
1400 | ||
1401 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
8b631f9c | 1402 | blk_mq_start_stopped_hw_queues(nullb->q, true); |
eff2c4f1 SL |
1403 | |
1404 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1405 | ||
1406 | return HRTIMER_RESTART; | |
1407 | } | |
1408 | ||
1409 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1410 | { | |
1411 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1412 | ||
1413 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1414 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1415 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1416 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1417 | } |
1418 | ||
bb4c19e0 AM |
1419 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
1420 | ||
1421 | static bool should_timeout_request(struct request *rq) | |
1422 | { | |
1423 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
1424 | struct nullb_device *dev = cmd->nq->dev; | |
1425 | ||
1426 | return should_fail(&dev->timeout_config.attr, 1); | |
1427 | } | |
1428 | ||
1429 | static bool should_requeue_request(struct request *rq) | |
1430 | { | |
1431 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
1432 | struct nullb_device *dev = cmd->nq->dev; | |
1433 | ||
1434 | return should_fail(&dev->requeue_config.attr, 1); | |
1435 | } | |
1436 | ||
1437 | static bool should_init_hctx_fail(struct nullb_device *dev) | |
1438 | { | |
1439 | return should_fail(&dev->init_hctx_fault_config.attr, 1); | |
1440 | } | |
1441 | ||
1442 | #else | |
1443 | ||
93b57046 JA |
1444 | static bool should_timeout_request(struct request *rq) |
1445 | { | |
24941b90 JA |
1446 | return false; |
1447 | } | |
93b57046 | 1448 | |
24941b90 JA |
1449 | static bool should_requeue_request(struct request *rq) |
1450 | { | |
93b57046 JA |
1451 | return false; |
1452 | } | |
1453 | ||
bb4c19e0 AM |
1454 | static bool should_init_hctx_fail(struct nullb_device *dev) |
1455 | { | |
1456 | return false; | |
1457 | } | |
1458 | ||
1459 | #endif | |
1460 | ||
a4e1d0b7 | 1461 | static void null_map_queues(struct blk_mq_tag_set *set) |
0a593fbb JA |
1462 | { |
1463 | struct nullb *nullb = set->driver_data; | |
1464 | int i, qoff; | |
15dfc662 SK |
1465 | unsigned int submit_queues = g_submit_queues; |
1466 | unsigned int poll_queues = g_poll_queues; | |
1467 | ||
1468 | if (nullb) { | |
1469 | struct nullb_device *dev = nullb->dev; | |
1470 | ||
1471 | /* | |
1472 | * Refer nr_hw_queues of the tag set to check if the expected | |
1473 | * number of hardware queues are prepared. If block layer failed | |
1474 | * to prepare them, use previous numbers of submit queues and | |
1475 | * poll queues to map queues. | |
1476 | */ | |
1477 | if (set->nr_hw_queues == | |
1478 | dev->submit_queues + dev->poll_queues) { | |
1479 | submit_queues = dev->submit_queues; | |
1480 | poll_queues = dev->poll_queues; | |
1481 | } else if (set->nr_hw_queues == | |
1482 | dev->prev_submit_queues + dev->prev_poll_queues) { | |
1483 | submit_queues = dev->prev_submit_queues; | |
1484 | poll_queues = dev->prev_poll_queues; | |
1485 | } else { | |
1486 | pr_warn("tag set has unexpected nr_hw_queues: %d\n", | |
1487 | set->nr_hw_queues); | |
10b41ea1 BVA |
1488 | WARN_ON_ONCE(true); |
1489 | submit_queues = 1; | |
1490 | poll_queues = 0; | |
15dfc662 SK |
1491 | } |
1492 | } | |
0a593fbb JA |
1493 | |
1494 | for (i = 0, qoff = 0; i < set->nr_maps; i++) { | |
1495 | struct blk_mq_queue_map *map = &set->map[i]; | |
1496 | ||
1497 | switch (i) { | |
1498 | case HCTX_TYPE_DEFAULT: | |
15dfc662 | 1499 | map->nr_queues = submit_queues; |
0a593fbb JA |
1500 | break; |
1501 | case HCTX_TYPE_READ: | |
1502 | map->nr_queues = 0; | |
1503 | continue; | |
1504 | case HCTX_TYPE_POLL: | |
15dfc662 | 1505 | map->nr_queues = poll_queues; |
0a593fbb JA |
1506 | break; |
1507 | } | |
1508 | map->queue_offset = qoff; | |
1509 | qoff += map->nr_queues; | |
1510 | blk_mq_map_queues(map); | |
1511 | } | |
0a593fbb JA |
1512 | } |
1513 | ||
1514 | static int null_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob) | |
1515 | { | |
1516 | struct nullb_queue *nq = hctx->driver_data; | |
1517 | LIST_HEAD(list); | |
1518 | int nr = 0; | |
5a26e45e | 1519 | struct request *rq; |
0a593fbb JA |
1520 | |
1521 | spin_lock(&nq->poll_lock); | |
1522 | list_splice_init(&nq->poll_list, &list); | |
5a26e45e CZ |
1523 | list_for_each_entry(rq, &list, queuelist) |
1524 | blk_mq_set_request_complete(rq); | |
0a593fbb JA |
1525 | spin_unlock(&nq->poll_lock); |
1526 | ||
1527 | while (!list_empty(&list)) { | |
1528 | struct nullb_cmd *cmd; | |
1529 | struct request *req; | |
1530 | ||
1531 | req = list_first_entry(&list, struct request, queuelist); | |
1532 | list_del_init(&req->queuelist); | |
1533 | cmd = blk_mq_rq_to_pdu(req); | |
1534 | cmd->error = null_process_cmd(cmd, req_op(req), blk_rq_pos(req), | |
1535 | blk_rq_sectors(req)); | |
c5eafd79 | 1536 | if (!blk_mq_add_to_batch(req, iob, (__force int) cmd->error, |
2385ebf3 | 1537 | blk_mq_end_request_batch)) |
8b631f9c | 1538 | blk_mq_end_request(req, cmd->error); |
0a593fbb JA |
1539 | nr++; |
1540 | } | |
1541 | ||
1542 | return nr; | |
1543 | } | |
1544 | ||
9bdb4833 | 1545 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq) |
5448aca4 | 1546 | { |
0a593fbb | 1547 | struct blk_mq_hw_ctx *hctx = rq->mq_hctx; |
de3510e5 DLM |
1548 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); |
1549 | ||
0a593fbb JA |
1550 | if (hctx->type == HCTX_TYPE_POLL) { |
1551 | struct nullb_queue *nq = hctx->driver_data; | |
1552 | ||
1553 | spin_lock(&nq->poll_lock); | |
5a26e45e CZ |
1554 | /* The request may have completed meanwhile. */ |
1555 | if (blk_mq_request_completed(rq)) { | |
1556 | spin_unlock(&nq->poll_lock); | |
1557 | return BLK_EH_DONE; | |
1558 | } | |
0a593fbb JA |
1559 | list_del_init(&rq->queuelist); |
1560 | spin_unlock(&nq->poll_lock); | |
1561 | } | |
1562 | ||
5a26e45e CZ |
1563 | pr_info("rq %p timed out\n", rq); |
1564 | ||
de3510e5 DLM |
1565 | /* |
1566 | * If the device is marked as blocking (i.e. memory backed or zoned | |
1567 | * device), the submission path may be blocked waiting for resources | |
1568 | * and cause real timeouts. For these real timeouts, the submission | |
1569 | * path will complete the request using blk_mq_complete_request(). | |
1570 | * Only fake timeouts need to execute blk_mq_complete_request() here. | |
1571 | */ | |
1572 | cmd->error = BLK_STS_TIMEOUT; | |
3e3876d3 | 1573 | if (cmd->fake_timeout || hctx->type == HCTX_TYPE_POLL) |
de3510e5 | 1574 | blk_mq_complete_request(rq); |
0df0bb08 | 1575 | return BLK_EH_DONE; |
5448aca4 JA |
1576 | } |
1577 | ||
fc17b653 | 1578 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
b6402014 | 1579 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1580 | { |
b6402014 DLM |
1581 | struct request *rq = bd->rq; |
1582 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq); | |
2984c868 | 1583 | struct nullb_queue *nq = hctx->driver_data; |
b6402014 DLM |
1584 | sector_t nr_sectors = blk_rq_sectors(rq); |
1585 | sector_t sector = blk_rq_pos(rq); | |
0a593fbb | 1586 | const bool is_poll = hctx->type == HCTX_TYPE_POLL; |
f2298c04 | 1587 | |
db5bcf87 JA |
1588 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1589 | ||
0a593fbb | 1590 | if (!is_poll && nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1591 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1592 | cmd->timer.function = null_cmd_timer_expired; | |
1593 | } | |
ff770422 | 1594 | cmd->error = BLK_STS_OK; |
2984c868 | 1595 | cmd->nq = nq; |
b6402014 DLM |
1596 | cmd->fake_timeout = should_timeout_request(rq) || |
1597 | blk_should_fake_timeout(rq->q); | |
f2298c04 | 1598 | |
b6402014 | 1599 | if (should_requeue_request(rq)) { |
24941b90 JA |
1600 | /* |
1601 | * Alternate between hitting the core BUSY path, and the | |
1602 | * driver driven requeue path | |
1603 | */ | |
1604 | nq->requeue_selection++; | |
1605 | if (nq->requeue_selection & 1) | |
1606 | return BLK_STS_RESOURCE; | |
b6402014 DLM |
1607 | blk_mq_requeue_request(rq, true); |
1608 | return BLK_STS_OK; | |
24941b90 | 1609 | } |
0a593fbb | 1610 | |
53f2bca2 CZ |
1611 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nq->dev->flags)) { |
1612 | blk_status_t sts = null_handle_throttled(cmd); | |
1613 | ||
1614 | if (sts != BLK_STS_OK) | |
1615 | return sts; | |
1616 | } | |
1617 | ||
1618 | blk_mq_start_request(rq); | |
1619 | ||
0a593fbb JA |
1620 | if (is_poll) { |
1621 | spin_lock(&nq->poll_lock); | |
b6402014 | 1622 | list_add_tail(&rq->queuelist, &nq->poll_list); |
0a593fbb JA |
1623 | spin_unlock(&nq->poll_lock); |
1624 | return BLK_STS_OK; | |
1625 | } | |
de3510e5 | 1626 | if (cmd->fake_timeout) |
24941b90 | 1627 | return BLK_STS_OK; |
93b57046 | 1628 | |
53f2bca2 CZ |
1629 | null_handle_cmd(cmd, sector, nr_sectors, req_op(rq)); |
1630 | return BLK_STS_OK; | |
f2298c04 JA |
1631 | } |
1632 | ||
d78bfa13 CZ |
1633 | static void null_queue_rqs(struct request **rqlist) |
1634 | { | |
1635 | struct request *requeue_list = NULL; | |
1636 | struct request **requeue_lastp = &requeue_list; | |
1637 | struct blk_mq_queue_data bd = { }; | |
1638 | blk_status_t ret; | |
1639 | ||
1640 | do { | |
1641 | struct request *rq = rq_list_pop(rqlist); | |
1642 | ||
1643 | bd.rq = rq; | |
1644 | ret = null_queue_rq(rq->mq_hctx, &bd); | |
1645 | if (ret != BLK_STS_OK) | |
1646 | rq_list_add_tail(&requeue_lastp, rq); | |
1647 | } while (!rq_list_empty(*rqlist)); | |
1648 | ||
1649 | *rqlist = requeue_list; | |
1650 | } | |
1651 | ||
78b10be2 BVA |
1652 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1653 | { | |
78b10be2 | 1654 | nq->dev = nullb->dev; |
0a593fbb JA |
1655 | INIT_LIST_HEAD(&nq->poll_list); |
1656 | spin_lock_init(&nq->poll_lock); | |
78b10be2 BVA |
1657 | } |
1658 | ||
1659 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, | |
1660 | unsigned int hctx_idx) | |
1661 | { | |
1662 | struct nullb *nullb = hctx->queue->queuedata; | |
1663 | struct nullb_queue *nq; | |
1664 | ||
bb4c19e0 | 1665 | if (should_init_hctx_fail(nullb->dev)) |
596444e7 | 1666 | return -EFAULT; |
596444e7 | 1667 | |
78b10be2 BVA |
1668 | nq = &nullb->queues[hctx_idx]; |
1669 | hctx->driver_data = nq; | |
1670 | null_init_queue(nullb, nq); | |
78b10be2 BVA |
1671 | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | static const struct blk_mq_ops null_mq_ops = { | |
1676 | .queue_rq = null_queue_rq, | |
d78bfa13 | 1677 | .queue_rqs = null_queue_rqs, |
78b10be2 BVA |
1678 | .complete = null_complete_rq, |
1679 | .timeout = null_timeout_rq, | |
0a593fbb JA |
1680 | .poll = null_poll, |
1681 | .map_queues = null_map_queues, | |
78b10be2 | 1682 | .init_hctx = null_init_hctx, |
78b10be2 BVA |
1683 | }; |
1684 | ||
9ae2d0aa MB |
1685 | static void null_del_dev(struct nullb *nullb) |
1686 | { | |
9b03b713 BVA |
1687 | struct nullb_device *dev; |
1688 | ||
1689 | if (!nullb) | |
1690 | return; | |
1691 | ||
1692 | dev = nullb->dev; | |
2984c868 | 1693 | |
95931a24 | 1694 | ida_free(&nullb_indexes, nullb->index); |
94bc02e3 | 1695 | |
9ae2d0aa MB |
1696 | list_del_init(&nullb->list); |
1697 | ||
74ede5af | 1698 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1699 | |
1700 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1701 | hrtimer_cancel(&nullb->bw_timer); | |
1702 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
8b631f9c | 1703 | blk_mq_start_stopped_hw_queues(nullb->q, true); |
eff2c4f1 SL |
1704 | } |
1705 | ||
8b9ab626 | 1706 | put_disk(nullb->disk); |
8b631f9c | 1707 | if (nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1708 | blk_mq_free_tag_set(nullb->tag_set); |
8b631f9c | 1709 | kfree(nullb->queues); |
deb78b41 SL |
1710 | if (null_cache_active(nullb)) |
1711 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1712 | kfree(nullb); |
2984c868 | 1713 | dev->nullb = NULL; |
9ae2d0aa MB |
1714 | } |
1715 | ||
e440626b | 1716 | static void null_config_discard(struct nullb *nullb, struct queue_limits *lim) |
306eb6b4 SL |
1717 | { |
1718 | if (nullb->dev->discard == false) | |
1719 | return; | |
1592cd15 | 1720 | |
49c7089f DLM |
1721 | if (!nullb->dev->memory_backed) { |
1722 | nullb->dev->discard = false; | |
1723 | pr_info("discard option is ignored without memory backing\n"); | |
1724 | return; | |
1725 | } | |
1726 | ||
1592cd15 CK |
1727 | if (nullb->dev->zoned) { |
1728 | nullb->dev->discard = false; | |
1729 | pr_info("discard option is ignored in zoned mode\n"); | |
1730 | return; | |
1731 | } | |
1732 | ||
e440626b | 1733 | lim->max_hw_discard_sectors = UINT_MAX >> 9; |
9ae2d0aa MB |
1734 | } |
1735 | ||
8b631f9c | 1736 | static const struct block_device_operations null_ops = { |
c62b37d9 | 1737 | .owner = THIS_MODULE, |
c62b37d9 CH |
1738 | .report_zones = null_report_zones, |
1739 | }; | |
1740 | ||
f2298c04 JA |
1741 | static int setup_queues(struct nullb *nullb) |
1742 | { | |
0a593fbb JA |
1743 | int nqueues = nr_cpu_ids; |
1744 | ||
1745 | if (g_poll_queues) | |
1746 | nqueues += g_poll_queues; | |
1747 | ||
1748 | nullb->queues = kcalloc(nqueues, sizeof(struct nullb_queue), | |
6396bb22 | 1749 | GFP_KERNEL); |
f2298c04 | 1750 | if (!nullb->queues) |
2d263a78 | 1751 | return -ENOMEM; |
f2298c04 | 1752 | |
2d263a78 MB |
1753 | return 0; |
1754 | } | |
1755 | ||
72ca2876 | 1756 | static int null_init_tag_set(struct blk_mq_tag_set *set, int poll_queues) |
82f402fe JA |
1757 | { |
1758 | set->ops = &null_mq_ops; | |
72ca2876 | 1759 | set->cmd_size = sizeof(struct nullb_cmd); |
e32b0855 | 1760 | set->timeout = 5 * HZ; |
72ca2876 | 1761 | set->nr_maps = 1; |
7012eef5 VF |
1762 | if (poll_queues) { |
1763 | set->nr_hw_queues += poll_queues; | |
72ca2876 | 1764 | set->nr_maps += 2; |
7012eef5 | 1765 | } |
82f402fe JA |
1766 | return blk_mq_alloc_tag_set(set); |
1767 | } | |
1768 | ||
72ca2876 CH |
1769 | static int null_init_global_tag_set(void) |
1770 | { | |
1771 | int error; | |
1772 | ||
1773 | if (tag_set.ops) | |
1774 | return 0; | |
1775 | ||
1776 | tag_set.nr_hw_queues = g_submit_queues; | |
1777 | tag_set.queue_depth = g_hw_queue_depth; | |
1778 | tag_set.numa_node = g_home_node; | |
1779 | tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
1780 | if (g_no_sched) | |
1781 | tag_set.flags |= BLK_MQ_F_NO_SCHED; | |
1782 | if (g_shared_tag_bitmap) | |
1783 | tag_set.flags |= BLK_MQ_F_TAG_HCTX_SHARED; | |
1784 | if (g_blocking) | |
1785 | tag_set.flags |= BLK_MQ_F_BLOCKING; | |
1786 | ||
1787 | error = null_init_tag_set(&tag_set, g_poll_queues); | |
1788 | if (error) | |
1789 | tag_set.ops = NULL; | |
1790 | return error; | |
1791 | } | |
1792 | ||
1793 | static int null_setup_tagset(struct nullb *nullb) | |
1794 | { | |
1795 | if (nullb->dev->shared_tags) { | |
1796 | nullb->tag_set = &tag_set; | |
1797 | return null_init_global_tag_set(); | |
1798 | } | |
1799 | ||
1800 | nullb->tag_set = &nullb->__tag_set; | |
1801 | nullb->tag_set->driver_data = nullb; | |
1802 | nullb->tag_set->nr_hw_queues = nullb->dev->submit_queues; | |
1803 | nullb->tag_set->queue_depth = nullb->dev->hw_queue_depth; | |
1804 | nullb->tag_set->numa_node = nullb->dev->home_node; | |
1805 | nullb->tag_set->flags = BLK_MQ_F_SHOULD_MERGE; | |
1806 | if (nullb->dev->no_sched) | |
1807 | nullb->tag_set->flags |= BLK_MQ_F_NO_SCHED; | |
1808 | if (nullb->dev->shared_tag_bitmap) | |
1809 | nullb->tag_set->flags |= BLK_MQ_F_TAG_HCTX_SHARED; | |
1810 | if (nullb->dev->blocking) | |
1811 | nullb->tag_set->flags |= BLK_MQ_F_BLOCKING; | |
1812 | return null_init_tag_set(nullb->tag_set, nullb->dev->poll_queues); | |
1813 | } | |
1814 | ||
5c4bd1f4 | 1815 | static int null_validate_conf(struct nullb_device *dev) |
cedcafad | 1816 | { |
63f8793e CK |
1817 | if (dev->queue_mode == NULL_Q_RQ) { |
1818 | pr_err("legacy IO path is no longer available\n"); | |
1819 | return -EINVAL; | |
1820 | } | |
8b631f9c CH |
1821 | if (dev->queue_mode == NULL_Q_BIO) { |
1822 | pr_err("BIO-based IO path is no longer available, using blk-mq instead.\n"); | |
1823 | dev->queue_mode = NULL_Q_MQ; | |
1824 | } | |
63f8793e | 1825 | |
cedcafad SL |
1826 | dev->blocksize = round_down(dev->blocksize, 512); |
1827 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad | 1828 | |
8b631f9c | 1829 | if (dev->use_per_node_hctx) { |
cedcafad SL |
1830 | if (dev->submit_queues != nr_online_nodes) |
1831 | dev->submit_queues = nr_online_nodes; | |
1832 | } else if (dev->submit_queues > nr_cpu_ids) | |
1833 | dev->submit_queues = nr_cpu_ids; | |
1834 | else if (dev->submit_queues == 0) | |
1835 | dev->submit_queues = 1; | |
15dfc662 SK |
1836 | dev->prev_submit_queues = dev->submit_queues; |
1837 | ||
1838 | if (dev->poll_queues > g_poll_queues) | |
1839 | dev->poll_queues = g_poll_queues; | |
15dfc662 | 1840 | dev->prev_poll_queues = dev->poll_queues; |
cedcafad | 1841 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); |
5bcd0e0c SL |
1842 | |
1843 | /* Do memory allocation, so set blocking */ | |
1844 | if (dev->memory_backed) | |
1845 | dev->blocking = true; | |
deb78b41 SL |
1846 | else /* cache is meaningless */ |
1847 | dev->cache_size = 0; | |
1848 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1849 | dev->cache_size); | |
eff2c4f1 | 1850 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
5c4bd1f4 DLM |
1851 | |
1852 | if (dev->zoned && | |
1853 | (!dev->zone_size || !is_power_of_2(dev->zone_size))) { | |
1854 | pr_err("zone_size must be power-of-two\n"); | |
1855 | return -EINVAL; | |
1856 | } | |
1857 | ||
1858 | return 0; | |
cedcafad SL |
1859 | } |
1860 | ||
33f782c4 | 1861 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1862 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1863 | { | |
1864 | if (!str[0]) | |
93b57046 JA |
1865 | return true; |
1866 | ||
24941b90 | 1867 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1868 | return false; |
1869 | ||
24941b90 JA |
1870 | attr->verbose = 0; |
1871 | return true; | |
1872 | } | |
1873 | #endif | |
1874 | ||
1875 | static bool null_setup_fault(void) | |
1876 | { | |
1877 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1878 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1879 | return false; | |
1880 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1881 | return false; | |
596444e7 BVA |
1882 | if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str)) |
1883 | return false; | |
33f782c4 | 1884 | #endif |
93b57046 JA |
1885 | return true; |
1886 | } | |
1887 | ||
2984c868 | 1888 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa | 1889 | { |
e440626b CH |
1890 | struct queue_limits lim = { |
1891 | .logical_block_size = dev->blocksize, | |
1892 | .physical_block_size = dev->blocksize, | |
1893 | .max_hw_sectors = dev->max_sectors, | |
1894 | }; | |
1895 | ||
9ae2d0aa | 1896 | struct nullb *nullb; |
dc501dc0 | 1897 | int rv; |
f2298c04 | 1898 | |
5c4bd1f4 DLM |
1899 | rv = null_validate_conf(dev); |
1900 | if (rv) | |
1901 | return rv; | |
cedcafad | 1902 | |
2984c868 | 1903 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1904 | if (!nullb) { |
1905 | rv = -ENOMEM; | |
24d2f903 | 1906 | goto out; |
dc501dc0 | 1907 | } |
2984c868 SL |
1908 | nullb->dev = dev; |
1909 | dev->nullb = nullb; | |
f2298c04 JA |
1910 | |
1911 | spin_lock_init(&nullb->lock); | |
1912 | ||
dc501dc0 RE |
1913 | rv = setup_queues(nullb); |
1914 | if (rv) | |
24d2f903 | 1915 | goto out_free_nullb; |
f2298c04 | 1916 | |
72ca2876 | 1917 | rv = null_setup_tagset(nullb); |
8b631f9c CH |
1918 | if (rv) |
1919 | goto out_cleanup_queues; | |
132226b3 | 1920 | |
e440626b CH |
1921 | if (dev->virt_boundary) |
1922 | lim.virt_boundary_mask = PAGE_SIZE - 1; | |
1923 | null_config_discard(nullb, &lim); | |
1924 | if (dev->zoned) { | |
1925 | rv = null_init_zoned_dev(dev, &lim); | |
1926 | if (rv) | |
1927 | goto out_cleanup_tags; | |
1928 | } | |
1929 | ||
1930 | nullb->disk = blk_mq_alloc_disk(nullb->tag_set, &lim, nullb); | |
8b631f9c CH |
1931 | if (IS_ERR(nullb->disk)) { |
1932 | rv = PTR_ERR(nullb->disk); | |
e440626b | 1933 | goto out_cleanup_zone; |
f2298c04 | 1934 | } |
8b631f9c | 1935 | nullb->q = nullb->disk->queue; |
f2298c04 | 1936 | |
eff2c4f1 SL |
1937 | if (dev->mbps) { |
1938 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1939 | nullb_setup_bwtimer(nullb); | |
1940 | } | |
1941 | ||
deb78b41 SL |
1942 | if (dev->cache_size > 0) { |
1943 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
f4f84586 | 1944 | blk_queue_write_cache(nullb->q, true, dev->fua); |
deb78b41 SL |
1945 | } |
1946 | ||
f2298c04 | 1947 | nullb->q->queuedata = nullb; |
8b904b5b | 1948 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
f2298c04 | 1949 | |
95931a24 | 1950 | rv = ida_alloc(&nullb_indexes, GFP_KERNEL); |
a2db328b | 1951 | if (rv < 0) |
e440626b | 1952 | goto out_cleanup_disk; |
a2db328b | 1953 | |
ee452a8d DC |
1954 | nullb->index = rv; |
1955 | dev->index = rv; | |
f2298c04 | 1956 | |
bb4c19e0 | 1957 | if (config_item_name(&dev->group.cg_item)) { |
49c3b926 DLM |
1958 | /* Use configfs dir name as the device name */ |
1959 | snprintf(nullb->disk_name, sizeof(nullb->disk_name), | |
bb4c19e0 | 1960 | "%s", config_item_name(&dev->group.cg_item)); |
49c3b926 DLM |
1961 | } else { |
1962 | sprintf(nullb->disk_name, "nullb%d", nullb->index); | |
1963 | } | |
b2b7e001 | 1964 | |
0a39e550 CH |
1965 | set_capacity(nullb->disk, |
1966 | ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT); | |
1967 | nullb->disk->major = null_major; | |
1968 | nullb->disk->first_minor = nullb->index; | |
1969 | nullb->disk->minors = 1; | |
1970 | nullb->disk->fops = &null_ops; | |
1971 | nullb->disk->private_data = nullb; | |
1972 | strscpy_pad(nullb->disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1973 | ||
1974 | if (nullb->dev->zoned) { | |
1975 | rv = null_register_zoned_dev(nullb); | |
1976 | if (rv) | |
1977 | goto out_ida_free; | |
1978 | } | |
1979 | ||
1980 | rv = add_disk(nullb->disk); | |
9ae2d0aa | 1981 | if (rv) |
ee452a8d | 1982 | goto out_ida_free; |
a514379b | 1983 | |
a514379b | 1984 | list_add_tail(&nullb->list, &nullb_list); |
3681c85d | 1985 | |
db060f54 DLM |
1986 | pr_info("disk %s created\n", nullb->disk_name); |
1987 | ||
f2298c04 | 1988 | return 0; |
ee452a8d DC |
1989 | |
1990 | out_ida_free: | |
1991 | ida_free(&nullb_indexes, nullb->index); | |
132226b3 | 1992 | out_cleanup_disk: |
8b9ab626 | 1993 | put_disk(nullb->disk); |
fbbd5d3a DLM |
1994 | out_cleanup_zone: |
1995 | null_free_zoned_dev(dev); | |
24d2f903 | 1996 | out_cleanup_tags: |
8b631f9c | 1997 | if (nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1998 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 | 1999 | out_cleanup_queues: |
8b631f9c | 2000 | kfree(nullb->queues); |
24d2f903 CH |
2001 | out_free_nullb: |
2002 | kfree(nullb); | |
2004bfde | 2003 | dev->nullb = NULL; |
24d2f903 | 2004 | out: |
dc501dc0 | 2005 | return rv; |
f2298c04 JA |
2006 | } |
2007 | ||
49c3b926 DLM |
2008 | static struct nullb *null_find_dev_by_name(const char *name) |
2009 | { | |
2010 | struct nullb *nullb = NULL, *nb; | |
2011 | ||
2012 | mutex_lock(&lock); | |
2013 | list_for_each_entry(nb, &nullb_list, list) { | |
2014 | if (strcmp(nb->disk_name, name) == 0) { | |
2015 | nullb = nb; | |
2016 | break; | |
2017 | } | |
2018 | } | |
2019 | mutex_unlock(&lock); | |
2020 | ||
2021 | return nullb; | |
2022 | } | |
2023 | ||
b3a0a73e DLM |
2024 | static int null_create_dev(void) |
2025 | { | |
2026 | struct nullb_device *dev; | |
2027 | int ret; | |
2028 | ||
2029 | dev = null_alloc_dev(); | |
2030 | if (!dev) | |
2031 | return -ENOMEM; | |
2032 | ||
a2db328b | 2033 | mutex_lock(&lock); |
b3a0a73e | 2034 | ret = null_add_dev(dev); |
a2db328b | 2035 | mutex_unlock(&lock); |
b3a0a73e DLM |
2036 | if (ret) { |
2037 | null_free_dev(dev); | |
2038 | return ret; | |
2039 | } | |
2040 | ||
2041 | return 0; | |
2042 | } | |
2043 | ||
2044 | static void null_destroy_dev(struct nullb *nullb) | |
2045 | { | |
2046 | struct nullb_device *dev = nullb->dev; | |
2047 | ||
2048 | null_del_dev(nullb); | |
8cfb9819 | 2049 | null_free_device_storage(dev, false); |
b3a0a73e DLM |
2050 | null_free_dev(dev); |
2051 | } | |
2052 | ||
f2298c04 JA |
2053 | static int __init null_init(void) |
2054 | { | |
af096e22 | 2055 | int ret = 0; |
f2298c04 | 2056 | unsigned int i; |
af096e22 | 2057 | struct nullb *nullb; |
f2298c04 | 2058 | |
2984c868 | 2059 | if (g_bs > PAGE_SIZE) { |
9c7eddf1 AA |
2060 | pr_warn("invalid block size\n"); |
2061 | pr_warn("defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 2062 | g_bs = PAGE_SIZE; |
9967d8ac | 2063 | } |
f2298c04 | 2064 | |
7ff684a6 | 2065 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
9c7eddf1 | 2066 | pr_err("invalid home_node value\n"); |
7ff684a6 JP |
2067 | g_home_node = NUMA_NO_NODE; |
2068 | } | |
2069 | ||
bb4c19e0 AM |
2070 | if (!null_setup_fault()) |
2071 | return -EINVAL; | |
2072 | ||
e50b1e32 | 2073 | if (g_queue_mode == NULL_Q_RQ) { |
525323d2 | 2074 | pr_err("legacy IO path is no longer available\n"); |
e50b1e32 JA |
2075 | return -EINVAL; |
2076 | } | |
525323d2 | 2077 | |
8b631f9c | 2078 | if (g_use_per_node_hctx) { |
2984c868 | 2079 | if (g_submit_queues != nr_online_nodes) { |
9c7eddf1 | 2080 | pr_warn("submit_queues param is set to %u.\n", |
525323d2 | 2081 | nr_online_nodes); |
2984c868 | 2082 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 2083 | } |
525323d2 | 2084 | } else if (g_submit_queues > nr_cpu_ids) { |
2984c868 | 2085 | g_submit_queues = nr_cpu_ids; |
525323d2 | 2086 | } else if (g_submit_queues <= 0) { |
2984c868 | 2087 | g_submit_queues = 1; |
525323d2 | 2088 | } |
f2298c04 | 2089 | |
3bf2bd20 SL |
2090 | config_group_init(&nullb_subsys.su_group); |
2091 | mutex_init(&nullb_subsys.su_mutex); | |
2092 | ||
2093 | ret = configfs_register_subsystem(&nullb_subsys); | |
2094 | if (ret) | |
14509b74 | 2095 | return ret; |
3bf2bd20 | 2096 | |
f2298c04 JA |
2097 | mutex_init(&lock); |
2098 | ||
f2298c04 | 2099 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
2100 | if (null_major < 0) { |
2101 | ret = null_major; | |
3bf2bd20 | 2102 | goto err_conf; |
db2d153d | 2103 | } |
f2298c04 JA |
2104 | |
2105 | for (i = 0; i < nr_devices; i++) { | |
b3a0a73e DLM |
2106 | ret = null_create_dev(); |
2107 | if (ret) | |
af096e22 | 2108 | goto err_dev; |
f2298c04 JA |
2109 | } |
2110 | ||
9c7eddf1 | 2111 | pr_info("module loaded\n"); |
f2298c04 | 2112 | return 0; |
af096e22 MH |
2113 | |
2114 | err_dev: | |
2115 | while (!list_empty(&nullb_list)) { | |
2116 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
b3a0a73e | 2117 | null_destroy_dev(nullb); |
af096e22 | 2118 | } |
af096e22 | 2119 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
2120 | err_conf: |
2121 | configfs_unregister_subsystem(&nullb_subsys); | |
af096e22 | 2122 | return ret; |
f2298c04 JA |
2123 | } |
2124 | ||
2125 | static void __exit null_exit(void) | |
2126 | { | |
2127 | struct nullb *nullb; | |
2128 | ||
3bf2bd20 SL |
2129 | configfs_unregister_subsystem(&nullb_subsys); |
2130 | ||
f2298c04 JA |
2131 | unregister_blkdev(null_major, "nullb"); |
2132 | ||
2133 | mutex_lock(&lock); | |
2134 | while (!list_empty(&nullb_list)) { | |
2135 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
b3a0a73e | 2136 | null_destroy_dev(nullb); |
f2298c04 JA |
2137 | } |
2138 | mutex_unlock(&lock); | |
6bb9535b | 2139 | |
14509b74 | 2140 | if (tag_set.ops) |
82f402fe | 2141 | blk_mq_free_tag_set(&tag_set); |
07d1b998 ZY |
2142 | |
2143 | mutex_destroy(&lock); | |
f2298c04 JA |
2144 | } |
2145 | ||
2146 | module_init(null_init); | |
2147 | module_exit(null_exit); | |
2148 | ||
231b3db1 | 2149 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
9e6727f8 | 2150 | MODULE_DESCRIPTION("multi queue aware block test driver"); |
f2298c04 | 2151 | MODULE_LICENSE("GPL"); |