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Commit | Line | Data |
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3bf2bd20 SL |
1 | /* |
2 | * Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and | |
3 | * Shaohua Li <shli@fb.com> | |
4 | */ | |
f2298c04 | 5 | #include <linux/module.h> |
fc1bc354 | 6 | |
f2298c04 JA |
7 | #include <linux/moduleparam.h> |
8 | #include <linux/sched.h> | |
9 | #include <linux/fs.h> | |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/blk-mq.h> | |
14 | #include <linux/hrtimer.h> | |
b2b7e001 | 15 | #include <linux/lightnvm.h> |
3bf2bd20 | 16 | #include <linux/configfs.h> |
2f54a613 | 17 | #include <linux/badblocks.h> |
f2298c04 | 18 | |
5bcd0e0c SL |
19 | #define SECTOR_SHIFT 9 |
20 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) | |
21 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) | |
22 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) | |
23 | #define SECTOR_MASK (PAGE_SECTORS - 1) | |
24 | ||
25 | #define FREE_BATCH 16 | |
26 | ||
eff2c4f1 SL |
27 | #define TICKS_PER_SEC 50ULL |
28 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
29 | ||
30 | static inline u64 mb_per_tick(int mbps) | |
31 | { | |
32 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
33 | } | |
f2298c04 JA |
34 | |
35 | struct nullb_cmd { | |
36 | struct list_head list; | |
37 | struct llist_node ll_list; | |
0864fe09 | 38 | struct __call_single_data csd; |
f2298c04 JA |
39 | struct request *rq; |
40 | struct bio *bio; | |
41 | unsigned int tag; | |
0864fe09 | 42 | blk_status_t error; |
f2298c04 | 43 | struct nullb_queue *nq; |
3c395a96 | 44 | struct hrtimer timer; |
f2298c04 JA |
45 | }; |
46 | ||
47 | struct nullb_queue { | |
48 | unsigned long *tag_map; | |
49 | wait_queue_head_t wait; | |
50 | unsigned int queue_depth; | |
2984c868 | 51 | struct nullb_device *dev; |
f2298c04 JA |
52 | |
53 | struct nullb_cmd *cmds; | |
54 | }; | |
55 | ||
3bf2bd20 SL |
56 | /* |
57 | * Status flags for nullb_device. | |
58 | * | |
59 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
60 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 61 | * THROTTLED: Device is being throttled. |
deb78b41 | 62 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
63 | */ |
64 | enum nullb_device_flags { | |
65 | NULLB_DEV_FL_CONFIGURED = 0, | |
66 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 67 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 68 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
69 | }; |
70 | ||
5bcd0e0c SL |
71 | /* |
72 | * nullb_page is a page in memory for nullb devices. | |
73 | * | |
74 | * @page: The page holding the data. | |
75 | * @bitmap: The bitmap represents which sector in the page has data. | |
76 | * Each bit represents one block size. For example, sector 8 | |
77 | * will use the 7th bit | |
deb78b41 SL |
78 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
79 | * page is being flushing to storage. FREE means the cache page is freed and | |
80 | * should be skipped from flushing to storage. Please see | |
81 | * null_make_cache_space | |
5bcd0e0c SL |
82 | */ |
83 | struct nullb_page { | |
84 | struct page *page; | |
85 | unsigned long bitmap; | |
86 | }; | |
deb78b41 SL |
87 | #define NULLB_PAGE_LOCK (sizeof(unsigned long) * 8 - 1) |
88 | #define NULLB_PAGE_FREE (sizeof(unsigned long) * 8 - 2) | |
5bcd0e0c | 89 | |
2984c868 SL |
90 | struct nullb_device { |
91 | struct nullb *nullb; | |
3bf2bd20 | 92 | struct config_item item; |
5bcd0e0c | 93 | struct radix_tree_root data; /* data stored in the disk */ |
deb78b41 | 94 | struct radix_tree_root cache; /* disk cache data */ |
3bf2bd20 | 95 | unsigned long flags; /* device flags */ |
deb78b41 | 96 | unsigned int curr_cache; |
2f54a613 | 97 | struct badblocks badblocks; |
2984c868 SL |
98 | |
99 | unsigned long size; /* device size in MB */ | |
100 | unsigned long completion_nsec; /* time in ns to complete a request */ | |
deb78b41 | 101 | unsigned long cache_size; /* disk cache size in MB */ |
2984c868 SL |
102 | unsigned int submit_queues; /* number of submission queues */ |
103 | unsigned int home_node; /* home node for the device */ | |
104 | unsigned int queue_mode; /* block interface */ | |
105 | unsigned int blocksize; /* block size */ | |
106 | unsigned int irqmode; /* IRQ completion handler */ | |
107 | unsigned int hw_queue_depth; /* queue depth */ | |
cedcafad | 108 | unsigned int index; /* index of the disk, only valid with a disk */ |
eff2c4f1 | 109 | unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */ |
2984c868 SL |
110 | bool use_lightnvm; /* register as a LightNVM device */ |
111 | bool blocking; /* blocking blk-mq device */ | |
112 | bool use_per_node_hctx; /* use per-node allocation for hardware context */ | |
cedcafad | 113 | bool power; /* power on/off the device */ |
5bcd0e0c | 114 | bool memory_backed; /* if data is stored in memory */ |
306eb6b4 | 115 | bool discard; /* if support discard */ |
2984c868 SL |
116 | }; |
117 | ||
f2298c04 | 118 | struct nullb { |
2984c868 | 119 | struct nullb_device *dev; |
f2298c04 JA |
120 | struct list_head list; |
121 | unsigned int index; | |
122 | struct request_queue *q; | |
123 | struct gendisk *disk; | |
b0b4e09c | 124 | struct nvm_dev *ndev; |
82f402fe JA |
125 | struct blk_mq_tag_set *tag_set; |
126 | struct blk_mq_tag_set __tag_set; | |
f2298c04 | 127 | unsigned int queue_depth; |
eff2c4f1 SL |
128 | atomic_long_t cur_bytes; |
129 | struct hrtimer bw_timer; | |
deb78b41 | 130 | unsigned long cache_flush_pos; |
f2298c04 JA |
131 | spinlock_t lock; |
132 | ||
133 | struct nullb_queue *queues; | |
134 | unsigned int nr_queues; | |
b2b7e001 | 135 | char disk_name[DISK_NAME_LEN]; |
f2298c04 JA |
136 | }; |
137 | ||
138 | static LIST_HEAD(nullb_list); | |
139 | static struct mutex lock; | |
140 | static int null_major; | |
94bc02e3 | 141 | static DEFINE_IDA(nullb_indexes); |
6bb9535b | 142 | static struct kmem_cache *ppa_cache; |
82f402fe | 143 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 144 | |
f2298c04 JA |
145 | enum { |
146 | NULL_IRQ_NONE = 0, | |
147 | NULL_IRQ_SOFTIRQ = 1, | |
148 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 149 | }; |
f2298c04 | 150 | |
ce2c350b | 151 | enum { |
f2298c04 JA |
152 | NULL_Q_BIO = 0, |
153 | NULL_Q_RQ = 1, | |
154 | NULL_Q_MQ = 2, | |
155 | }; | |
156 | ||
b3cffc38 | 157 | static int g_no_sched; |
158 | module_param_named(no_sched, g_no_sched, int, S_IRUGO); | |
159 | MODULE_PARM_DESC(no_sched, "No io scheduler"); | |
160 | ||
2984c868 SL |
161 | static int g_submit_queues = 1; |
162 | module_param_named(submit_queues, g_submit_queues, int, S_IRUGO); | |
f2298c04 JA |
163 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
164 | ||
2984c868 SL |
165 | static int g_home_node = NUMA_NO_NODE; |
166 | module_param_named(home_node, g_home_node, int, S_IRUGO); | |
f2298c04 JA |
167 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
168 | ||
2984c868 | 169 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
170 | |
171 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
172 | { | |
173 | int ret, new_val; | |
174 | ||
175 | ret = kstrtoint(str, 10, &new_val); | |
176 | if (ret) | |
177 | return -EINVAL; | |
178 | ||
179 | if (new_val < min || new_val > max) | |
180 | return -EINVAL; | |
181 | ||
182 | *val = new_val; | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
187 | { | |
2984c868 | 188 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
189 | } |
190 | ||
9c27847d | 191 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
192 | .set = null_set_queue_mode, |
193 | .get = param_get_int, | |
194 | }; | |
195 | ||
2984c868 | 196 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, S_IRUGO); |
54ae81cd | 197 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 198 | |
2984c868 SL |
199 | static int g_gb = 250; |
200 | module_param_named(gb, g_gb, int, S_IRUGO); | |
f2298c04 JA |
201 | MODULE_PARM_DESC(gb, "Size in GB"); |
202 | ||
2984c868 SL |
203 | static int g_bs = 512; |
204 | module_param_named(bs, g_bs, int, S_IRUGO); | |
f2298c04 JA |
205 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
206 | ||
82f402fe | 207 | static int nr_devices = 1; |
f2298c04 JA |
208 | module_param(nr_devices, int, S_IRUGO); |
209 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); | |
210 | ||
2984c868 SL |
211 | static bool g_use_lightnvm; |
212 | module_param_named(use_lightnvm, g_use_lightnvm, bool, S_IRUGO); | |
b2b7e001 MB |
213 | MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); |
214 | ||
2984c868 SL |
215 | static bool g_blocking; |
216 | module_param_named(blocking, g_blocking, bool, S_IRUGO); | |
db5bcf87 JA |
217 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
218 | ||
82f402fe JA |
219 | static bool shared_tags; |
220 | module_param(shared_tags, bool, S_IRUGO); | |
221 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); | |
222 | ||
2984c868 | 223 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
224 | |
225 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
226 | { | |
2984c868 | 227 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
228 | NULL_IRQ_TIMER); |
229 | } | |
230 | ||
9c27847d | 231 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
232 | .set = null_set_irqmode, |
233 | .get = param_get_int, | |
234 | }; | |
235 | ||
2984c868 | 236 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, S_IRUGO); |
f2298c04 JA |
237 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
238 | ||
2984c868 SL |
239 | static unsigned long g_completion_nsec = 10000; |
240 | module_param_named(completion_nsec, g_completion_nsec, ulong, S_IRUGO); | |
f2298c04 JA |
241 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
242 | ||
2984c868 SL |
243 | static int g_hw_queue_depth = 64; |
244 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, S_IRUGO); | |
f2298c04 JA |
245 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
246 | ||
2984c868 SL |
247 | static bool g_use_per_node_hctx; |
248 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, S_IRUGO); | |
20005244 | 249 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 250 | |
3bf2bd20 SL |
251 | static struct nullb_device *null_alloc_dev(void); |
252 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
253 | static void null_del_dev(struct nullb *nullb); |
254 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 255 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
256 | |
257 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
258 | { | |
259 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
260 | } | |
261 | ||
262 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
263 | { | |
264 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
265 | } | |
266 | ||
267 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
268 | char *page) | |
269 | { | |
270 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
271 | } | |
272 | ||
273 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
274 | { | |
275 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
276 | } | |
277 | ||
278 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
279 | const char *page, size_t count) | |
280 | { | |
281 | unsigned int tmp; | |
282 | int result; | |
283 | ||
284 | result = kstrtouint(page, 0, &tmp); | |
285 | if (result) | |
286 | return result; | |
287 | ||
288 | *val = tmp; | |
289 | return count; | |
290 | } | |
291 | ||
292 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
293 | const char *page, size_t count) | |
294 | { | |
295 | int result; | |
296 | unsigned long tmp; | |
297 | ||
298 | result = kstrtoul(page, 0, &tmp); | |
299 | if (result) | |
300 | return result; | |
301 | ||
302 | *val = tmp; | |
303 | return count; | |
304 | } | |
305 | ||
306 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
307 | size_t count) | |
308 | { | |
309 | bool tmp; | |
310 | int result; | |
311 | ||
312 | result = kstrtobool(page, &tmp); | |
313 | if (result) | |
314 | return result; | |
315 | ||
316 | *val = tmp; | |
317 | return count; | |
318 | } | |
319 | ||
320 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
321 | #define NULLB_DEVICE_ATTR(NAME, TYPE) \ | |
322 | static ssize_t \ | |
323 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
324 | { \ | |
325 | return nullb_device_##TYPE##_attr_show( \ | |
326 | to_nullb_device(item)->NAME, page); \ | |
327 | } \ | |
328 | static ssize_t \ | |
329 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
330 | size_t count) \ | |
331 | { \ | |
332 | if (test_bit(NULLB_DEV_FL_CONFIGURED, &to_nullb_device(item)->flags)) \ | |
333 | return -EBUSY; \ | |
334 | return nullb_device_##TYPE##_attr_store( \ | |
335 | &to_nullb_device(item)->NAME, page, count); \ | |
336 | } \ | |
337 | CONFIGFS_ATTR(nullb_device_, NAME); | |
338 | ||
339 | NULLB_DEVICE_ATTR(size, ulong); | |
340 | NULLB_DEVICE_ATTR(completion_nsec, ulong); | |
341 | NULLB_DEVICE_ATTR(submit_queues, uint); | |
342 | NULLB_DEVICE_ATTR(home_node, uint); | |
343 | NULLB_DEVICE_ATTR(queue_mode, uint); | |
344 | NULLB_DEVICE_ATTR(blocksize, uint); | |
345 | NULLB_DEVICE_ATTR(irqmode, uint); | |
346 | NULLB_DEVICE_ATTR(hw_queue_depth, uint); | |
cedcafad | 347 | NULLB_DEVICE_ATTR(index, uint); |
3bf2bd20 SL |
348 | NULLB_DEVICE_ATTR(use_lightnvm, bool); |
349 | NULLB_DEVICE_ATTR(blocking, bool); | |
350 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool); | |
5bcd0e0c | 351 | NULLB_DEVICE_ATTR(memory_backed, bool); |
306eb6b4 | 352 | NULLB_DEVICE_ATTR(discard, bool); |
eff2c4f1 | 353 | NULLB_DEVICE_ATTR(mbps, uint); |
deb78b41 | 354 | NULLB_DEVICE_ATTR(cache_size, ulong); |
3bf2bd20 | 355 | |
cedcafad SL |
356 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
357 | { | |
358 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
359 | } | |
360 | ||
361 | static ssize_t nullb_device_power_store(struct config_item *item, | |
362 | const char *page, size_t count) | |
363 | { | |
364 | struct nullb_device *dev = to_nullb_device(item); | |
365 | bool newp = false; | |
366 | ssize_t ret; | |
367 | ||
368 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
369 | if (ret < 0) | |
370 | return ret; | |
371 | ||
372 | if (!dev->power && newp) { | |
373 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
374 | return count; | |
375 | if (null_add_dev(dev)) { | |
376 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
377 | return -ENOMEM; | |
378 | } | |
379 | ||
380 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
381 | dev->power = newp; | |
b3c30512 | 382 | } else if (dev->power && !newp) { |
cedcafad SL |
383 | mutex_lock(&lock); |
384 | dev->power = newp; | |
385 | null_del_dev(dev->nullb); | |
386 | mutex_unlock(&lock); | |
387 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
388 | } | |
389 | ||
390 | return count; | |
391 | } | |
392 | ||
393 | CONFIGFS_ATTR(nullb_device_, power); | |
394 | ||
2f54a613 SL |
395 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
396 | { | |
397 | struct nullb_device *t_dev = to_nullb_device(item); | |
398 | ||
399 | return badblocks_show(&t_dev->badblocks, page, 0); | |
400 | } | |
401 | ||
402 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
403 | const char *page, size_t count) | |
404 | { | |
405 | struct nullb_device *t_dev = to_nullb_device(item); | |
406 | char *orig, *buf, *tmp; | |
407 | u64 start, end; | |
408 | int ret; | |
409 | ||
410 | orig = kstrndup(page, count, GFP_KERNEL); | |
411 | if (!orig) | |
412 | return -ENOMEM; | |
413 | ||
414 | buf = strstrip(orig); | |
415 | ||
416 | ret = -EINVAL; | |
417 | if (buf[0] != '+' && buf[0] != '-') | |
418 | goto out; | |
419 | tmp = strchr(&buf[1], '-'); | |
420 | if (!tmp) | |
421 | goto out; | |
422 | *tmp = '\0'; | |
423 | ret = kstrtoull(buf + 1, 0, &start); | |
424 | if (ret) | |
425 | goto out; | |
426 | ret = kstrtoull(tmp + 1, 0, &end); | |
427 | if (ret) | |
428 | goto out; | |
429 | ret = -EINVAL; | |
430 | if (start > end) | |
431 | goto out; | |
432 | /* enable badblocks */ | |
433 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
434 | if (buf[0] == '+') | |
435 | ret = badblocks_set(&t_dev->badblocks, start, | |
436 | end - start + 1, 1); | |
437 | else | |
438 | ret = badblocks_clear(&t_dev->badblocks, start, | |
439 | end - start + 1); | |
440 | if (ret == 0) | |
441 | ret = count; | |
442 | out: | |
443 | kfree(orig); | |
444 | return ret; | |
445 | } | |
446 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
447 | ||
3bf2bd20 SL |
448 | static struct configfs_attribute *nullb_device_attrs[] = { |
449 | &nullb_device_attr_size, | |
450 | &nullb_device_attr_completion_nsec, | |
451 | &nullb_device_attr_submit_queues, | |
452 | &nullb_device_attr_home_node, | |
453 | &nullb_device_attr_queue_mode, | |
454 | &nullb_device_attr_blocksize, | |
455 | &nullb_device_attr_irqmode, | |
456 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 457 | &nullb_device_attr_index, |
3bf2bd20 SL |
458 | &nullb_device_attr_use_lightnvm, |
459 | &nullb_device_attr_blocking, | |
460 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 461 | &nullb_device_attr_power, |
5bcd0e0c | 462 | &nullb_device_attr_memory_backed, |
306eb6b4 | 463 | &nullb_device_attr_discard, |
eff2c4f1 | 464 | &nullb_device_attr_mbps, |
deb78b41 | 465 | &nullb_device_attr_cache_size, |
2f54a613 | 466 | &nullb_device_attr_badblocks, |
3bf2bd20 SL |
467 | NULL, |
468 | }; | |
469 | ||
470 | static void nullb_device_release(struct config_item *item) | |
471 | { | |
5bcd0e0c SL |
472 | struct nullb_device *dev = to_nullb_device(item); |
473 | ||
deb78b41 | 474 | null_free_device_storage(dev, false); |
5bcd0e0c | 475 | null_free_dev(dev); |
3bf2bd20 SL |
476 | } |
477 | ||
478 | static struct configfs_item_operations nullb_device_ops = { | |
479 | .release = nullb_device_release, | |
480 | }; | |
481 | ||
e1919dff | 482 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
483 | .ct_item_ops = &nullb_device_ops, |
484 | .ct_attrs = nullb_device_attrs, | |
485 | .ct_owner = THIS_MODULE, | |
486 | }; | |
487 | ||
488 | static struct | |
489 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
490 | { | |
491 | struct nullb_device *dev; | |
492 | ||
493 | dev = null_alloc_dev(); | |
494 | if (!dev) | |
495 | return ERR_PTR(-ENOMEM); | |
496 | ||
497 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
498 | ||
499 | return &dev->item; | |
500 | } | |
501 | ||
502 | static void | |
503 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
504 | { | |
cedcafad SL |
505 | struct nullb_device *dev = to_nullb_device(item); |
506 | ||
507 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
508 | mutex_lock(&lock); | |
509 | dev->power = false; | |
510 | null_del_dev(dev->nullb); | |
511 | mutex_unlock(&lock); | |
512 | } | |
513 | ||
3bf2bd20 SL |
514 | config_item_put(item); |
515 | } | |
516 | ||
517 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
518 | { | |
2f54a613 | 519 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks\n"); |
3bf2bd20 SL |
520 | } |
521 | ||
522 | CONFIGFS_ATTR_RO(memb_group_, features); | |
523 | ||
524 | static struct configfs_attribute *nullb_group_attrs[] = { | |
525 | &memb_group_attr_features, | |
526 | NULL, | |
527 | }; | |
528 | ||
529 | static struct configfs_group_operations nullb_group_ops = { | |
530 | .make_item = nullb_group_make_item, | |
531 | .drop_item = nullb_group_drop_item, | |
532 | }; | |
533 | ||
e1919dff | 534 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
535 | .ct_group_ops = &nullb_group_ops, |
536 | .ct_attrs = nullb_group_attrs, | |
537 | .ct_owner = THIS_MODULE, | |
538 | }; | |
539 | ||
540 | static struct configfs_subsystem nullb_subsys = { | |
541 | .su_group = { | |
542 | .cg_item = { | |
543 | .ci_namebuf = "nullb", | |
544 | .ci_type = &nullb_group_type, | |
545 | }, | |
546 | }, | |
547 | }; | |
548 | ||
deb78b41 SL |
549 | static inline int null_cache_active(struct nullb *nullb) |
550 | { | |
551 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
552 | } | |
553 | ||
2984c868 SL |
554 | static struct nullb_device *null_alloc_dev(void) |
555 | { | |
556 | struct nullb_device *dev; | |
557 | ||
558 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
559 | if (!dev) | |
560 | return NULL; | |
5bcd0e0c | 561 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 562 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
563 | if (badblocks_init(&dev->badblocks, 0)) { |
564 | kfree(dev); | |
565 | return NULL; | |
566 | } | |
567 | ||
2984c868 SL |
568 | dev->size = g_gb * 1024; |
569 | dev->completion_nsec = g_completion_nsec; | |
570 | dev->submit_queues = g_submit_queues; | |
571 | dev->home_node = g_home_node; | |
572 | dev->queue_mode = g_queue_mode; | |
573 | dev->blocksize = g_bs; | |
574 | dev->irqmode = g_irqmode; | |
575 | dev->hw_queue_depth = g_hw_queue_depth; | |
576 | dev->use_lightnvm = g_use_lightnvm; | |
577 | dev->blocking = g_blocking; | |
578 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
579 | return dev; | |
580 | } | |
581 | ||
582 | static void null_free_dev(struct nullb_device *dev) | |
583 | { | |
1addb798 DD |
584 | if (!dev) |
585 | return; | |
586 | ||
587 | badblocks_exit(&dev->badblocks); | |
2984c868 SL |
588 | kfree(dev); |
589 | } | |
590 | ||
f2298c04 JA |
591 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
592 | { | |
593 | clear_bit_unlock(tag, nq->tag_map); | |
594 | ||
595 | if (waitqueue_active(&nq->wait)) | |
596 | wake_up(&nq->wait); | |
597 | } | |
598 | ||
599 | static unsigned int get_tag(struct nullb_queue *nq) | |
600 | { | |
601 | unsigned int tag; | |
602 | ||
603 | do { | |
604 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
605 | if (tag >= nq->queue_depth) | |
606 | return -1U; | |
607 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
608 | ||
609 | return tag; | |
610 | } | |
611 | ||
612 | static void free_cmd(struct nullb_cmd *cmd) | |
613 | { | |
614 | put_tag(cmd->nq, cmd->tag); | |
615 | } | |
616 | ||
3c395a96 PV |
617 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
618 | ||
f2298c04 JA |
619 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
620 | { | |
621 | struct nullb_cmd *cmd; | |
622 | unsigned int tag; | |
623 | ||
624 | tag = get_tag(nq); | |
625 | if (tag != -1U) { | |
626 | cmd = &nq->cmds[tag]; | |
627 | cmd->tag = tag; | |
628 | cmd->nq = nq; | |
2984c868 | 629 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
630 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
631 | HRTIMER_MODE_REL); | |
632 | cmd->timer.function = null_cmd_timer_expired; | |
633 | } | |
f2298c04 JA |
634 | return cmd; |
635 | } | |
636 | ||
637 | return NULL; | |
638 | } | |
639 | ||
640 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
641 | { | |
642 | struct nullb_cmd *cmd; | |
643 | DEFINE_WAIT(wait); | |
644 | ||
645 | cmd = __alloc_cmd(nq); | |
646 | if (cmd || !can_wait) | |
647 | return cmd; | |
648 | ||
649 | do { | |
650 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
651 | cmd = __alloc_cmd(nq); | |
652 | if (cmd) | |
653 | break; | |
654 | ||
655 | io_schedule(); | |
656 | } while (1); | |
657 | ||
658 | finish_wait(&nq->wait, &wait); | |
659 | return cmd; | |
660 | } | |
661 | ||
662 | static void end_cmd(struct nullb_cmd *cmd) | |
663 | { | |
cf8ecc5a | 664 | struct request_queue *q = NULL; |
2984c868 | 665 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 666 | |
e8271201 MK |
667 | if (cmd->rq) |
668 | q = cmd->rq->q; | |
669 | ||
ce2c350b CH |
670 | switch (queue_mode) { |
671 | case NULL_Q_MQ: | |
5bcd0e0c | 672 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b CH |
673 | return; |
674 | case NULL_Q_RQ: | |
675 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
5bcd0e0c | 676 | blk_end_request_all(cmd->rq, cmd->error); |
ce2c350b CH |
677 | break; |
678 | case NULL_Q_BIO: | |
5bcd0e0c | 679 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 680 | bio_endio(cmd->bio); |
48cc661e | 681 | break; |
ce2c350b | 682 | } |
f2298c04 | 683 | |
48cc661e JA |
684 | free_cmd(cmd); |
685 | ||
cf8ecc5a | 686 | /* Restart queue if needed, as we are freeing a tag */ |
48cc661e | 687 | if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) { |
cf8ecc5a AA |
688 | unsigned long flags; |
689 | ||
690 | spin_lock_irqsave(q->queue_lock, flags); | |
48cc661e | 691 | blk_start_queue_async(q); |
cf8ecc5a | 692 | spin_unlock_irqrestore(q->queue_lock, flags); |
f2298c04 | 693 | } |
cf8ecc5a AA |
694 | } |
695 | ||
696 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
697 | { | |
698 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
699 | |
700 | return HRTIMER_NORESTART; | |
701 | } | |
702 | ||
703 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
704 | { | |
2984c868 | 705 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 706 | |
3c395a96 | 707 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
708 | } |
709 | ||
710 | static void null_softirq_done_fn(struct request *rq) | |
711 | { | |
2984c868 SL |
712 | struct nullb *nullb = rq->q->queuedata; |
713 | ||
714 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
d891fa70 JA |
715 | end_cmd(blk_mq_rq_to_pdu(rq)); |
716 | else | |
717 | end_cmd(rq->special); | |
f2298c04 JA |
718 | } |
719 | ||
5bcd0e0c SL |
720 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
721 | { | |
722 | struct nullb_page *t_page; | |
723 | ||
724 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
725 | if (!t_page) | |
726 | goto out; | |
727 | ||
728 | t_page->page = alloc_pages(gfp_flags, 0); | |
729 | if (!t_page->page) | |
730 | goto out_freepage; | |
731 | ||
732 | t_page->bitmap = 0; | |
733 | return t_page; | |
734 | out_freepage: | |
735 | kfree(t_page); | |
736 | out: | |
737 | return NULL; | |
738 | } | |
739 | ||
740 | static void null_free_page(struct nullb_page *t_page) | |
741 | { | |
deb78b41 SL |
742 | __set_bit(NULLB_PAGE_FREE, &t_page->bitmap); |
743 | if (test_bit(NULLB_PAGE_LOCK, &t_page->bitmap)) | |
744 | return; | |
5bcd0e0c SL |
745 | __free_page(t_page->page); |
746 | kfree(t_page); | |
747 | } | |
748 | ||
deb78b41 SL |
749 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
750 | bool is_cache) | |
5bcd0e0c SL |
751 | { |
752 | unsigned int sector_bit; | |
753 | u64 idx; | |
754 | struct nullb_page *t_page, *ret; | |
755 | struct radix_tree_root *root; | |
756 | ||
deb78b41 | 757 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
758 | idx = sector >> PAGE_SECTORS_SHIFT; |
759 | sector_bit = (sector & SECTOR_MASK); | |
760 | ||
761 | t_page = radix_tree_lookup(root, idx); | |
762 | if (t_page) { | |
763 | __clear_bit(sector_bit, &t_page->bitmap); | |
764 | ||
765 | if (!t_page->bitmap) { | |
766 | ret = radix_tree_delete_item(root, idx, t_page); | |
767 | WARN_ON(ret != t_page); | |
768 | null_free_page(ret); | |
deb78b41 SL |
769 | if (is_cache) |
770 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
771 | } |
772 | } | |
773 | } | |
774 | ||
775 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 776 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
777 | { |
778 | struct radix_tree_root *root; | |
779 | ||
deb78b41 | 780 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
781 | |
782 | if (radix_tree_insert(root, idx, t_page)) { | |
783 | null_free_page(t_page); | |
784 | t_page = radix_tree_lookup(root, idx); | |
785 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
786 | } else if (is_cache) |
787 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
788 | |
789 | return t_page; | |
790 | } | |
791 | ||
deb78b41 | 792 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
793 | { |
794 | unsigned long pos = 0; | |
795 | int nr_pages; | |
796 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
797 | struct radix_tree_root *root; | |
798 | ||
deb78b41 | 799 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
800 | |
801 | do { | |
802 | int i; | |
803 | ||
804 | nr_pages = radix_tree_gang_lookup(root, | |
805 | (void **)t_pages, pos, FREE_BATCH); | |
806 | ||
807 | for (i = 0; i < nr_pages; i++) { | |
808 | pos = t_pages[i]->page->index; | |
809 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
810 | WARN_ON(ret != t_pages[i]); | |
811 | null_free_page(ret); | |
812 | } | |
813 | ||
814 | pos++; | |
815 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
816 | |
817 | if (is_cache) | |
818 | dev->curr_cache = 0; | |
5bcd0e0c SL |
819 | } |
820 | ||
deb78b41 SL |
821 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
822 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
823 | { |
824 | unsigned int sector_bit; | |
825 | u64 idx; | |
826 | struct nullb_page *t_page; | |
deb78b41 | 827 | struct radix_tree_root *root; |
5bcd0e0c SL |
828 | |
829 | idx = sector >> PAGE_SECTORS_SHIFT; | |
830 | sector_bit = (sector & SECTOR_MASK); | |
831 | ||
deb78b41 SL |
832 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
833 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
834 | WARN_ON(t_page && t_page->page->index != idx); |
835 | ||
836 | if (t_page && (for_write || test_bit(sector_bit, &t_page->bitmap))) | |
837 | return t_page; | |
838 | ||
839 | return NULL; | |
840 | } | |
841 | ||
deb78b41 SL |
842 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
843 | sector_t sector, bool for_write, bool ignore_cache) | |
844 | { | |
845 | struct nullb_page *page = NULL; | |
846 | ||
847 | if (!ignore_cache) | |
848 | page = __null_lookup_page(nullb, sector, for_write, true); | |
849 | if (page) | |
850 | return page; | |
851 | return __null_lookup_page(nullb, sector, for_write, false); | |
852 | } | |
853 | ||
5bcd0e0c | 854 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
deb78b41 | 855 | sector_t sector, bool ignore_cache) |
5bcd0e0c SL |
856 | { |
857 | u64 idx; | |
858 | struct nullb_page *t_page; | |
859 | ||
deb78b41 | 860 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
861 | if (t_page) |
862 | return t_page; | |
863 | ||
864 | spin_unlock_irq(&nullb->lock); | |
865 | ||
866 | t_page = null_alloc_page(GFP_NOIO); | |
867 | if (!t_page) | |
868 | goto out_lock; | |
869 | ||
870 | if (radix_tree_preload(GFP_NOIO)) | |
871 | goto out_freepage; | |
872 | ||
873 | spin_lock_irq(&nullb->lock); | |
874 | idx = sector >> PAGE_SECTORS_SHIFT; | |
875 | t_page->page->index = idx; | |
deb78b41 | 876 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
877 | radix_tree_preload_end(); |
878 | ||
879 | return t_page; | |
880 | out_freepage: | |
881 | null_free_page(t_page); | |
882 | out_lock: | |
883 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
884 | return null_lookup_page(nullb, sector, true, ignore_cache); |
885 | } | |
886 | ||
887 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
888 | { | |
889 | int i; | |
890 | unsigned int offset; | |
891 | u64 idx; | |
892 | struct nullb_page *t_page, *ret; | |
893 | void *dst, *src; | |
894 | ||
895 | idx = c_page->page->index; | |
896 | ||
897 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
898 | ||
899 | __clear_bit(NULLB_PAGE_LOCK, &c_page->bitmap); | |
900 | if (test_bit(NULLB_PAGE_FREE, &c_page->bitmap)) { | |
901 | null_free_page(c_page); | |
902 | if (t_page && t_page->bitmap == 0) { | |
903 | ret = radix_tree_delete_item(&nullb->dev->data, | |
904 | idx, t_page); | |
905 | null_free_page(t_page); | |
906 | } | |
907 | return 0; | |
908 | } | |
909 | ||
910 | if (!t_page) | |
911 | return -ENOMEM; | |
912 | ||
913 | src = kmap_atomic(c_page->page); | |
914 | dst = kmap_atomic(t_page->page); | |
915 | ||
916 | for (i = 0; i < PAGE_SECTORS; | |
917 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
918 | if (test_bit(i, &c_page->bitmap)) { | |
919 | offset = (i << SECTOR_SHIFT); | |
920 | memcpy(dst + offset, src + offset, | |
921 | nullb->dev->blocksize); | |
922 | __set_bit(i, &t_page->bitmap); | |
923 | } | |
924 | } | |
925 | ||
926 | kunmap_atomic(dst); | |
927 | kunmap_atomic(src); | |
928 | ||
929 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
930 | null_free_page(ret); | |
931 | nullb->dev->curr_cache -= PAGE_SIZE; | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
936 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 937 | { |
deb78b41 SL |
938 | int i, err, nr_pages; |
939 | struct nullb_page *c_pages[FREE_BATCH]; | |
940 | unsigned long flushed = 0, one_round; | |
941 | ||
942 | again: | |
943 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
944 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
945 | return 0; | |
946 | ||
947 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
948 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
949 | /* | |
950 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
951 | * avoid race, we don't allow page free | |
952 | */ | |
953 | for (i = 0; i < nr_pages; i++) { | |
954 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
955 | /* | |
956 | * We found the page which is being flushed to disk by other | |
957 | * threads | |
958 | */ | |
959 | if (test_bit(NULLB_PAGE_LOCK, &c_pages[i]->bitmap)) | |
960 | c_pages[i] = NULL; | |
961 | else | |
962 | __set_bit(NULLB_PAGE_LOCK, &c_pages[i]->bitmap); | |
963 | } | |
964 | ||
965 | one_round = 0; | |
966 | for (i = 0; i < nr_pages; i++) { | |
967 | if (c_pages[i] == NULL) | |
968 | continue; | |
969 | err = null_flush_cache_page(nullb, c_pages[i]); | |
970 | if (err) | |
971 | return err; | |
972 | one_round++; | |
973 | } | |
974 | flushed += one_round << PAGE_SHIFT; | |
975 | ||
976 | if (n > flushed) { | |
977 | if (nr_pages == 0) | |
978 | nullb->cache_flush_pos = 0; | |
979 | if (one_round == 0) { | |
980 | /* give other threads a chance */ | |
981 | spin_unlock_irq(&nullb->lock); | |
982 | spin_lock_irq(&nullb->lock); | |
983 | } | |
984 | goto again; | |
985 | } | |
986 | return 0; | |
5bcd0e0c SL |
987 | } |
988 | ||
989 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 990 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
991 | { |
992 | size_t temp, count = 0; | |
993 | unsigned int offset; | |
994 | struct nullb_page *t_page; | |
995 | void *dst, *src; | |
996 | ||
997 | while (count < n) { | |
998 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
999 | ||
deb78b41 SL |
1000 | if (null_cache_active(nullb) && !is_fua) |
1001 | null_make_cache_space(nullb, PAGE_SIZE); | |
1002 | ||
5bcd0e0c | 1003 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
1004 | t_page = null_insert_page(nullb, sector, |
1005 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
1006 | if (!t_page) |
1007 | return -ENOSPC; | |
1008 | ||
1009 | src = kmap_atomic(source); | |
1010 | dst = kmap_atomic(t_page->page); | |
1011 | memcpy(dst + offset, src + off + count, temp); | |
1012 | kunmap_atomic(dst); | |
1013 | kunmap_atomic(src); | |
1014 | ||
1015 | __set_bit(sector & SECTOR_MASK, &t_page->bitmap); | |
1016 | ||
deb78b41 SL |
1017 | if (is_fua) |
1018 | null_free_sector(nullb, sector, true); | |
1019 | ||
5bcd0e0c SL |
1020 | count += temp; |
1021 | sector += temp >> SECTOR_SHIFT; | |
1022 | } | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1027 | unsigned int off, sector_t sector, size_t n) | |
1028 | { | |
1029 | size_t temp, count = 0; | |
1030 | unsigned int offset; | |
1031 | struct nullb_page *t_page; | |
1032 | void *dst, *src; | |
1033 | ||
1034 | while (count < n) { | |
1035 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1036 | ||
1037 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1038 | t_page = null_lookup_page(nullb, sector, false, |
1039 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
1040 | |
1041 | dst = kmap_atomic(dest); | |
1042 | if (!t_page) { | |
1043 | memset(dst + off + count, 0, temp); | |
1044 | goto next; | |
1045 | } | |
1046 | src = kmap_atomic(t_page->page); | |
1047 | memcpy(dst + off + count, src + offset, temp); | |
1048 | kunmap_atomic(src); | |
1049 | next: | |
1050 | kunmap_atomic(dst); | |
1051 | ||
1052 | count += temp; | |
1053 | sector += temp >> SECTOR_SHIFT; | |
1054 | } | |
1055 | return 0; | |
1056 | } | |
1057 | ||
306eb6b4 SL |
1058 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
1059 | { | |
1060 | size_t temp; | |
1061 | ||
1062 | spin_lock_irq(&nullb->lock); | |
1063 | while (n > 0) { | |
1064 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1065 | null_free_sector(nullb, sector, false); |
1066 | if (null_cache_active(nullb)) | |
1067 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1068 | sector += temp >> SECTOR_SHIFT; |
1069 | n -= temp; | |
1070 | } | |
1071 | spin_unlock_irq(&nullb->lock); | |
1072 | } | |
1073 | ||
deb78b41 SL |
1074 | static int null_handle_flush(struct nullb *nullb) |
1075 | { | |
1076 | int err; | |
1077 | ||
1078 | if (!null_cache_active(nullb)) | |
1079 | return 0; | |
1080 | ||
1081 | spin_lock_irq(&nullb->lock); | |
1082 | while (true) { | |
1083 | err = null_make_cache_space(nullb, | |
1084 | nullb->dev->cache_size * 1024 * 1024); | |
1085 | if (err || nullb->dev->curr_cache == 0) | |
1086 | break; | |
1087 | } | |
1088 | ||
1089 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1090 | spin_unlock_irq(&nullb->lock); | |
1091 | return err; | |
1092 | } | |
1093 | ||
5bcd0e0c | 1094 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1095 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1096 | bool is_fua) | |
f2298c04 | 1097 | { |
5bcd0e0c SL |
1098 | int err = 0; |
1099 | ||
1100 | if (!is_write) { | |
1101 | err = copy_from_nullb(nullb, page, off, sector, len); | |
1102 | flush_dcache_page(page); | |
1103 | } else { | |
1104 | flush_dcache_page(page); | |
deb78b41 | 1105 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1106 | } |
1107 | ||
1108 | return err; | |
1109 | } | |
1110 | ||
1111 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1112 | { | |
1113 | struct request *rq = cmd->rq; | |
1114 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1115 | int err; | |
1116 | unsigned int len; | |
1117 | sector_t sector; | |
1118 | struct req_iterator iter; | |
1119 | struct bio_vec bvec; | |
1120 | ||
1121 | sector = blk_rq_pos(rq); | |
1122 | ||
306eb6b4 SL |
1123 | if (req_op(rq) == REQ_OP_DISCARD) { |
1124 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1125 | return 0; | |
1126 | } | |
1127 | ||
5bcd0e0c SL |
1128 | spin_lock_irq(&nullb->lock); |
1129 | rq_for_each_segment(bvec, rq, iter) { | |
1130 | len = bvec.bv_len; | |
1131 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1132 | op_is_write(req_op(rq)), sector, |
1133 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1134 | if (err) { |
1135 | spin_unlock_irq(&nullb->lock); | |
1136 | return err; | |
1137 | } | |
1138 | sector += len >> SECTOR_SHIFT; | |
1139 | } | |
1140 | spin_unlock_irq(&nullb->lock); | |
1141 | ||
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1146 | { | |
1147 | struct bio *bio = cmd->bio; | |
1148 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1149 | int err; | |
1150 | unsigned int len; | |
1151 | sector_t sector; | |
1152 | struct bio_vec bvec; | |
1153 | struct bvec_iter iter; | |
1154 | ||
1155 | sector = bio->bi_iter.bi_sector; | |
1156 | ||
306eb6b4 SL |
1157 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1158 | null_handle_discard(nullb, sector, | |
1159 | bio_sectors(bio) << SECTOR_SHIFT); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
5bcd0e0c SL |
1163 | spin_lock_irq(&nullb->lock); |
1164 | bio_for_each_segment(bvec, bio, iter) { | |
1165 | len = bvec.bv_len; | |
1166 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1167 | op_is_write(bio_op(bio)), sector, |
1168 | bio_op(bio) & REQ_FUA); | |
5bcd0e0c SL |
1169 | if (err) { |
1170 | spin_unlock_irq(&nullb->lock); | |
1171 | return err; | |
1172 | } | |
1173 | sector += len >> SECTOR_SHIFT; | |
1174 | } | |
1175 | spin_unlock_irq(&nullb->lock); | |
1176 | return 0; | |
1177 | } | |
1178 | ||
eff2c4f1 SL |
1179 | static void null_stop_queue(struct nullb *nullb) |
1180 | { | |
1181 | struct request_queue *q = nullb->q; | |
1182 | ||
1183 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1184 | blk_mq_stop_hw_queues(q); | |
1185 | else { | |
1186 | spin_lock_irq(q->queue_lock); | |
1187 | blk_stop_queue(q); | |
1188 | spin_unlock_irq(q->queue_lock); | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | static void null_restart_queue_async(struct nullb *nullb) | |
1193 | { | |
1194 | struct request_queue *q = nullb->q; | |
1195 | unsigned long flags; | |
1196 | ||
1197 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1198 | blk_mq_start_stopped_hw_queues(q, true); | |
1199 | else { | |
1200 | spin_lock_irqsave(q->queue_lock, flags); | |
1201 | blk_start_queue_async(q); | |
1202 | spin_unlock_irqrestore(q->queue_lock, flags); | |
1203 | } | |
1204 | } | |
1205 | ||
5bcd0e0c SL |
1206 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd) |
1207 | { | |
1208 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1209 | struct nullb *nullb = dev->nullb; |
5bcd0e0c SL |
1210 | int err = 0; |
1211 | ||
eff2c4f1 SL |
1212 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
1213 | struct request *rq = cmd->rq; | |
1214 | ||
1215 | if (!hrtimer_active(&nullb->bw_timer)) | |
1216 | hrtimer_restart(&nullb->bw_timer); | |
1217 | ||
1218 | if (atomic_long_sub_return(blk_rq_bytes(rq), | |
1219 | &nullb->cur_bytes) < 0) { | |
1220 | null_stop_queue(nullb); | |
1221 | /* race with timer */ | |
1222 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1223 | null_restart_queue_async(nullb); | |
1224 | if (dev->queue_mode == NULL_Q_RQ) { | |
1225 | struct request_queue *q = nullb->q; | |
1226 | ||
1227 | spin_lock_irq(q->queue_lock); | |
1228 | rq->rq_flags |= RQF_DONTPREP; | |
1229 | blk_requeue_request(q, rq); | |
1230 | spin_unlock_irq(q->queue_lock); | |
1231 | return BLK_STS_OK; | |
1232 | } else | |
1233 | /* requeue request */ | |
1234 | return BLK_STS_RESOURCE; | |
1235 | } | |
1236 | } | |
1237 | ||
2f54a613 SL |
1238 | if (nullb->dev->badblocks.shift != -1) { |
1239 | int bad_sectors; | |
1240 | sector_t sector, size, first_bad; | |
1241 | bool is_flush = true; | |
1242 | ||
1243 | if (dev->queue_mode == NULL_Q_BIO && | |
1244 | bio_op(cmd->bio) != REQ_OP_FLUSH) { | |
1245 | is_flush = false; | |
1246 | sector = cmd->bio->bi_iter.bi_sector; | |
1247 | size = bio_sectors(cmd->bio); | |
1248 | } | |
1249 | if (dev->queue_mode != NULL_Q_BIO && | |
1250 | req_op(cmd->rq) != REQ_OP_FLUSH) { | |
1251 | is_flush = false; | |
1252 | sector = blk_rq_pos(cmd->rq); | |
1253 | size = blk_rq_sectors(cmd->rq); | |
1254 | } | |
1255 | if (!is_flush && badblocks_check(&nullb->dev->badblocks, sector, | |
1256 | size, &first_bad, &bad_sectors)) { | |
1257 | cmd->error = BLK_STS_IOERR; | |
1258 | goto out; | |
1259 | } | |
1260 | } | |
1261 | ||
5bcd0e0c | 1262 | if (dev->memory_backed) { |
deb78b41 SL |
1263 | if (dev->queue_mode == NULL_Q_BIO) { |
1264 | if (bio_op(cmd->bio) == REQ_OP_FLUSH) | |
1265 | err = null_handle_flush(nullb); | |
1266 | else | |
1267 | err = null_handle_bio(cmd); | |
1268 | } else { | |
1269 | if (req_op(cmd->rq) == REQ_OP_FLUSH) | |
1270 | err = null_handle_flush(nullb); | |
1271 | else | |
1272 | err = null_handle_rq(cmd); | |
1273 | } | |
5bcd0e0c SL |
1274 | } |
1275 | cmd->error = errno_to_blk_status(err); | |
2f54a613 | 1276 | out: |
f2298c04 | 1277 | /* Complete IO by inline, softirq or timer */ |
5bcd0e0c | 1278 | switch (dev->irqmode) { |
f2298c04 | 1279 | case NULL_IRQ_SOFTIRQ: |
5bcd0e0c | 1280 | switch (dev->queue_mode) { |
ce2c350b | 1281 | case NULL_Q_MQ: |
08e0029a | 1282 | blk_mq_complete_request(cmd->rq); |
ce2c350b CH |
1283 | break; |
1284 | case NULL_Q_RQ: | |
1285 | blk_complete_request(cmd->rq); | |
1286 | break; | |
1287 | case NULL_Q_BIO: | |
1288 | /* | |
1289 | * XXX: no proper submitting cpu information available. | |
1290 | */ | |
1291 | end_cmd(cmd); | |
1292 | break; | |
1293 | } | |
1294 | break; | |
1295 | case NULL_IRQ_NONE: | |
f2298c04 | 1296 | end_cmd(cmd); |
f2298c04 JA |
1297 | break; |
1298 | case NULL_IRQ_TIMER: | |
1299 | null_cmd_end_timer(cmd); | |
1300 | break; | |
1301 | } | |
5bcd0e0c | 1302 | return BLK_STS_OK; |
f2298c04 JA |
1303 | } |
1304 | ||
eff2c4f1 SL |
1305 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1306 | { | |
1307 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1308 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1309 | unsigned int mbps = nullb->dev->mbps; | |
1310 | ||
1311 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1312 | return HRTIMER_NORESTART; | |
1313 | ||
1314 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1315 | null_restart_queue_async(nullb); | |
1316 | ||
1317 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1318 | ||
1319 | return HRTIMER_RESTART; | |
1320 | } | |
1321 | ||
1322 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1323 | { | |
1324 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1325 | ||
1326 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1327 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1328 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1329 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1330 | } |
1331 | ||
1332 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1333 | { | |
1334 | int index = 0; | |
1335 | ||
1336 | if (nullb->nr_queues != 1) | |
1337 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1338 | ||
1339 | return &nullb->queues[index]; | |
1340 | } | |
1341 | ||
dece1635 | 1342 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
1343 | { |
1344 | struct nullb *nullb = q->queuedata; | |
1345 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1346 | struct nullb_cmd *cmd; | |
1347 | ||
1348 | cmd = alloc_cmd(nq, 1); | |
1349 | cmd->bio = bio; | |
1350 | ||
1351 | null_handle_cmd(cmd); | |
dece1635 | 1352 | return BLK_QC_T_NONE; |
f2298c04 JA |
1353 | } |
1354 | ||
1355 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) | |
1356 | { | |
1357 | struct nullb *nullb = q->queuedata; | |
1358 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1359 | struct nullb_cmd *cmd; | |
1360 | ||
1361 | cmd = alloc_cmd(nq, 0); | |
1362 | if (cmd) { | |
1363 | cmd->rq = req; | |
1364 | req->special = cmd; | |
1365 | return BLKPREP_OK; | |
1366 | } | |
8b70f45e | 1367 | blk_stop_queue(q); |
f2298c04 JA |
1368 | |
1369 | return BLKPREP_DEFER; | |
1370 | } | |
1371 | ||
1372 | static void null_request_fn(struct request_queue *q) | |
1373 | { | |
1374 | struct request *rq; | |
1375 | ||
1376 | while ((rq = blk_fetch_request(q)) != NULL) { | |
1377 | struct nullb_cmd *cmd = rq->special; | |
1378 | ||
1379 | spin_unlock_irq(q->queue_lock); | |
1380 | null_handle_cmd(cmd); | |
1381 | spin_lock_irq(q->queue_lock); | |
1382 | } | |
1383 | } | |
1384 | ||
fc17b653 | 1385 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1386 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1387 | { |
74c45052 | 1388 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1389 | struct nullb_queue *nq = hctx->driver_data; |
f2298c04 | 1390 | |
db5bcf87 JA |
1391 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1392 | ||
2984c868 | 1393 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1394 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1395 | cmd->timer.function = null_cmd_timer_expired; | |
1396 | } | |
74c45052 | 1397 | cmd->rq = bd->rq; |
2984c868 | 1398 | cmd->nq = nq; |
f2298c04 | 1399 | |
74c45052 | 1400 | blk_mq_start_request(bd->rq); |
e2490073 | 1401 | |
5bcd0e0c | 1402 | return null_handle_cmd(cmd); |
f2298c04 JA |
1403 | } |
1404 | ||
f363b089 | 1405 | static const struct blk_mq_ops null_mq_ops = { |
f2298c04 | 1406 | .queue_rq = null_queue_rq, |
ce2c350b | 1407 | .complete = null_softirq_done_fn, |
f2298c04 JA |
1408 | }; |
1409 | ||
de65d2d2 MB |
1410 | static void cleanup_queue(struct nullb_queue *nq) |
1411 | { | |
1412 | kfree(nq->tag_map); | |
1413 | kfree(nq->cmds); | |
1414 | } | |
1415 | ||
1416 | static void cleanup_queues(struct nullb *nullb) | |
1417 | { | |
1418 | int i; | |
1419 | ||
1420 | for (i = 0; i < nullb->nr_queues; i++) | |
1421 | cleanup_queue(&nullb->queues[i]); | |
1422 | ||
1423 | kfree(nullb->queues); | |
1424 | } | |
1425 | ||
b2b7e001 MB |
1426 | #ifdef CONFIG_NVM |
1427 | ||
2a842aca | 1428 | static void null_lnvm_end_io(struct request *rq, blk_status_t status) |
b2b7e001 MB |
1429 | { |
1430 | struct nvm_rq *rqd = rq->end_io_data; | |
b2b7e001 | 1431 | |
2a842aca CH |
1432 | /* XXX: lighnvm core seems to expect NVM_RSP_* values here.. */ |
1433 | rqd->error = status ? -EIO : 0; | |
06894efe | 1434 | nvm_end_io(rqd); |
b2b7e001 MB |
1435 | |
1436 | blk_put_request(rq); | |
1437 | } | |
1438 | ||
16f26c3a | 1439 | static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) |
b2b7e001 | 1440 | { |
16f26c3a | 1441 | struct request_queue *q = dev->q; |
b2b7e001 MB |
1442 | struct request *rq; |
1443 | struct bio *bio = rqd->bio; | |
1444 | ||
aebf526b CH |
1445 | rq = blk_mq_alloc_request(q, |
1446 | op_is_write(bio_op(bio)) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); | |
b2b7e001 MB |
1447 | if (IS_ERR(rq)) |
1448 | return -ENOMEM; | |
1449 | ||
2644a3cc | 1450 | blk_init_request_from_bio(rq, bio); |
b2b7e001 MB |
1451 | |
1452 | rq->end_io_data = rqd; | |
1453 | ||
1454 | blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
16f26c3a | 1459 | static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id) |
b2b7e001 | 1460 | { |
2984c868 SL |
1461 | struct nullb *nullb = dev->q->queuedata; |
1462 | sector_t size = (sector_t)nullb->dev->size * 1024 * 1024ULL; | |
5b40db99 | 1463 | sector_t blksize; |
b2b7e001 MB |
1464 | struct nvm_id_group *grp; |
1465 | ||
1466 | id->ver_id = 0x1; | |
1467 | id->vmnt = 0; | |
bf643185 | 1468 | id->cap = 0x2; |
b2b7e001 | 1469 | id->dom = 0x1; |
5b40db99 MB |
1470 | |
1471 | id->ppaf.blk_offset = 0; | |
1472 | id->ppaf.blk_len = 16; | |
1473 | id->ppaf.pg_offset = 16; | |
1474 | id->ppaf.pg_len = 16; | |
1475 | id->ppaf.sect_offset = 32; | |
1476 | id->ppaf.sect_len = 8; | |
1477 | id->ppaf.pln_offset = 40; | |
1478 | id->ppaf.pln_len = 8; | |
1479 | id->ppaf.lun_offset = 48; | |
1480 | id->ppaf.lun_len = 8; | |
1481 | id->ppaf.ch_offset = 56; | |
1482 | id->ppaf.ch_len = 8; | |
b2b7e001 | 1483 | |
2984c868 | 1484 | sector_div(size, nullb->dev->blocksize); /* convert size to pages */ |
e93d12ae | 1485 | size >>= 8; /* concert size to pgs pr blk */ |
19bd6fe7 | 1486 | grp = &id->grp; |
b2b7e001 | 1487 | grp->mtype = 0; |
5b40db99 | 1488 | grp->fmtype = 0; |
b2b7e001 | 1489 | grp->num_ch = 1; |
b2b7e001 | 1490 | grp->num_pg = 256; |
5b40db99 | 1491 | blksize = size; |
e93d12ae | 1492 | size >>= 16; |
5b40db99 | 1493 | grp->num_lun = size + 1; |
e93d12ae | 1494 | sector_div(blksize, grp->num_lun); |
5b40db99 MB |
1495 | grp->num_blk = blksize; |
1496 | grp->num_pln = 1; | |
1497 | ||
2984c868 SL |
1498 | grp->fpg_sz = nullb->dev->blocksize; |
1499 | grp->csecs = nullb->dev->blocksize; | |
b2b7e001 MB |
1500 | grp->trdt = 25000; |
1501 | grp->trdm = 25000; | |
1502 | grp->tprt = 500000; | |
1503 | grp->tprm = 500000; | |
1504 | grp->tbet = 1500000; | |
1505 | grp->tbem = 1500000; | |
1506 | grp->mpos = 0x010101; /* single plane rwe */ | |
2984c868 | 1507 | grp->cpar = nullb->dev->hw_queue_depth; |
b2b7e001 MB |
1508 | |
1509 | return 0; | |
1510 | } | |
1511 | ||
16f26c3a | 1512 | static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name) |
b2b7e001 MB |
1513 | { |
1514 | mempool_t *virtmem_pool; | |
1515 | ||
6bb9535b | 1516 | virtmem_pool = mempool_create_slab_pool(64, ppa_cache); |
b2b7e001 MB |
1517 | if (!virtmem_pool) { |
1518 | pr_err("null_blk: Unable to create virtual memory pool\n"); | |
1519 | return NULL; | |
1520 | } | |
1521 | ||
1522 | return virtmem_pool; | |
1523 | } | |
1524 | ||
1525 | static void null_lnvm_destroy_dma_pool(void *pool) | |
1526 | { | |
1527 | mempool_destroy(pool); | |
1528 | } | |
1529 | ||
16f26c3a | 1530 | static void *null_lnvm_dev_dma_alloc(struct nvm_dev *dev, void *pool, |
b2b7e001 MB |
1531 | gfp_t mem_flags, dma_addr_t *dma_handler) |
1532 | { | |
1533 | return mempool_alloc(pool, mem_flags); | |
1534 | } | |
1535 | ||
1536 | static void null_lnvm_dev_dma_free(void *pool, void *entry, | |
1537 | dma_addr_t dma_handler) | |
1538 | { | |
1539 | mempool_free(entry, pool); | |
1540 | } | |
1541 | ||
1542 | static struct nvm_dev_ops null_lnvm_dev_ops = { | |
1543 | .identity = null_lnvm_id, | |
1544 | .submit_io = null_lnvm_submit_io, | |
1545 | ||
1546 | .create_dma_pool = null_lnvm_create_dma_pool, | |
1547 | .destroy_dma_pool = null_lnvm_destroy_dma_pool, | |
1548 | .dev_dma_alloc = null_lnvm_dev_dma_alloc, | |
1549 | .dev_dma_free = null_lnvm_dev_dma_free, | |
1550 | ||
1551 | /* Simulate nvme protocol restriction */ | |
1552 | .max_phys_sect = 64, | |
1553 | }; | |
9ae2d0aa MB |
1554 | |
1555 | static int null_nvm_register(struct nullb *nullb) | |
1556 | { | |
b0b4e09c MB |
1557 | struct nvm_dev *dev; |
1558 | int rv; | |
1559 | ||
1560 | dev = nvm_alloc_dev(0); | |
1561 | if (!dev) | |
1562 | return -ENOMEM; | |
1563 | ||
1564 | dev->q = nullb->q; | |
1565 | memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); | |
1566 | dev->ops = &null_lnvm_dev_ops; | |
1567 | ||
1568 | rv = nvm_register(dev); | |
1569 | if (rv) { | |
1570 | kfree(dev); | |
1571 | return rv; | |
1572 | } | |
1573 | nullb->ndev = dev; | |
1574 | return 0; | |
9ae2d0aa MB |
1575 | } |
1576 | ||
1577 | static void null_nvm_unregister(struct nullb *nullb) | |
1578 | { | |
b0b4e09c | 1579 | nvm_unregister(nullb->ndev); |
9ae2d0aa | 1580 | } |
b2b7e001 | 1581 | #else |
9ae2d0aa MB |
1582 | static int null_nvm_register(struct nullb *nullb) |
1583 | { | |
92153d30 | 1584 | pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n"); |
9ae2d0aa MB |
1585 | return -EINVAL; |
1586 | } | |
1587 | static void null_nvm_unregister(struct nullb *nullb) {} | |
b2b7e001 MB |
1588 | #endif /* CONFIG_NVM */ |
1589 | ||
9ae2d0aa MB |
1590 | static void null_del_dev(struct nullb *nullb) |
1591 | { | |
2984c868 SL |
1592 | struct nullb_device *dev = nullb->dev; |
1593 | ||
94bc02e3 SL |
1594 | ida_simple_remove(&nullb_indexes, nullb->index); |
1595 | ||
9ae2d0aa MB |
1596 | list_del_init(&nullb->list); |
1597 | ||
2984c868 | 1598 | if (dev->use_lightnvm) |
9ae2d0aa MB |
1599 | null_nvm_unregister(nullb); |
1600 | else | |
1601 | del_gendisk(nullb->disk); | |
eff2c4f1 SL |
1602 | |
1603 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1604 | hrtimer_cancel(&nullb->bw_timer); | |
1605 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1606 | null_restart_queue_async(nullb); | |
1607 | } | |
1608 | ||
9ae2d0aa | 1609 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1610 | if (dev->queue_mode == NULL_Q_MQ && |
1611 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1612 | blk_mq_free_tag_set(nullb->tag_set); |
2984c868 | 1613 | if (!dev->use_lightnvm) |
9ae2d0aa MB |
1614 | put_disk(nullb->disk); |
1615 | cleanup_queues(nullb); | |
deb78b41 SL |
1616 | if (null_cache_active(nullb)) |
1617 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1618 | kfree(nullb); |
2984c868 | 1619 | dev->nullb = NULL; |
9ae2d0aa MB |
1620 | } |
1621 | ||
306eb6b4 SL |
1622 | static void null_config_discard(struct nullb *nullb) |
1623 | { | |
1624 | if (nullb->dev->discard == false) | |
1625 | return; | |
1626 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1627 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1628 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
1629 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nullb->q); | |
9ae2d0aa MB |
1630 | } |
1631 | ||
f2298c04 JA |
1632 | static int null_open(struct block_device *bdev, fmode_t mode) |
1633 | { | |
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | static void null_release(struct gendisk *disk, fmode_t mode) | |
1638 | { | |
1639 | } | |
1640 | ||
1641 | static const struct block_device_operations null_fops = { | |
1642 | .owner = THIS_MODULE, | |
1643 | .open = null_open, | |
1644 | .release = null_release, | |
1645 | }; | |
1646 | ||
82f402fe JA |
1647 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1648 | { | |
1649 | BUG_ON(!nullb); | |
1650 | BUG_ON(!nq); | |
1651 | ||
1652 | init_waitqueue_head(&nq->wait); | |
1653 | nq->queue_depth = nullb->queue_depth; | |
2984c868 | 1654 | nq->dev = nullb->dev; |
82f402fe JA |
1655 | } |
1656 | ||
1657 | static void null_init_queues(struct nullb *nullb) | |
1658 | { | |
1659 | struct request_queue *q = nullb->q; | |
1660 | struct blk_mq_hw_ctx *hctx; | |
1661 | struct nullb_queue *nq; | |
1662 | int i; | |
1663 | ||
1664 | queue_for_each_hw_ctx(q, hctx, i) { | |
1665 | if (!hctx->nr_ctx || !hctx->tags) | |
1666 | continue; | |
1667 | nq = &nullb->queues[i]; | |
1668 | hctx->driver_data = nq; | |
1669 | null_init_queue(nullb, nq); | |
1670 | nullb->nr_queues++; | |
1671 | } | |
1672 | } | |
1673 | ||
f2298c04 JA |
1674 | static int setup_commands(struct nullb_queue *nq) |
1675 | { | |
1676 | struct nullb_cmd *cmd; | |
1677 | int i, tag_size; | |
1678 | ||
1679 | nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL); | |
1680 | if (!nq->cmds) | |
2d263a78 | 1681 | return -ENOMEM; |
f2298c04 JA |
1682 | |
1683 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
1684 | nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL); | |
1685 | if (!nq->tag_map) { | |
1686 | kfree(nq->cmds); | |
2d263a78 | 1687 | return -ENOMEM; |
f2298c04 JA |
1688 | } |
1689 | ||
1690 | for (i = 0; i < nq->queue_depth; i++) { | |
1691 | cmd = &nq->cmds[i]; | |
1692 | INIT_LIST_HEAD(&cmd->list); | |
1693 | cmd->ll_list.next = NULL; | |
1694 | cmd->tag = -1U; | |
1695 | } | |
1696 | ||
1697 | return 0; | |
1698 | } | |
1699 | ||
f2298c04 JA |
1700 | static int setup_queues(struct nullb *nullb) |
1701 | { | |
2984c868 SL |
1702 | nullb->queues = kzalloc(nullb->dev->submit_queues * |
1703 | sizeof(struct nullb_queue), GFP_KERNEL); | |
f2298c04 | 1704 | if (!nullb->queues) |
2d263a78 | 1705 | return -ENOMEM; |
f2298c04 JA |
1706 | |
1707 | nullb->nr_queues = 0; | |
2984c868 | 1708 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1709 | |
2d263a78 MB |
1710 | return 0; |
1711 | } | |
1712 | ||
1713 | static int init_driver_queues(struct nullb *nullb) | |
1714 | { | |
1715 | struct nullb_queue *nq; | |
1716 | int i, ret = 0; | |
f2298c04 | 1717 | |
2984c868 | 1718 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1719 | nq = &nullb->queues[i]; |
2d263a78 MB |
1720 | |
1721 | null_init_queue(nullb, nq); | |
1722 | ||
1723 | ret = setup_commands(nq); | |
1724 | if (ret) | |
31f9690e | 1725 | return ret; |
f2298c04 JA |
1726 | nullb->nr_queues++; |
1727 | } | |
2d263a78 | 1728 | return 0; |
f2298c04 JA |
1729 | } |
1730 | ||
9ae2d0aa | 1731 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
1732 | { |
1733 | struct gendisk *disk; | |
f2298c04 | 1734 | sector_t size; |
9ae2d0aa | 1735 | |
2984c868 | 1736 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1737 | if (!disk) |
1738 | return -ENOMEM; | |
2984c868 | 1739 | size = (sector_t)nullb->dev->size * 1024 * 1024ULL; |
9ae2d0aa MB |
1740 | set_capacity(disk, size >> 9); |
1741 | ||
1742 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1743 | disk->major = null_major; | |
1744 | disk->first_minor = nullb->index; | |
1745 | disk->fops = &null_fops; | |
1746 | disk->private_data = nullb; | |
1747 | disk->queue = nullb->q; | |
1748 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1749 | ||
1750 | add_disk(disk); | |
1751 | return 0; | |
1752 | } | |
1753 | ||
2984c868 | 1754 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1755 | { |
1756 | set->ops = &null_mq_ops; | |
2984c868 SL |
1757 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1758 | g_submit_queues; | |
1759 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1760 | g_hw_queue_depth; | |
1761 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1762 | set->cmd_size = sizeof(struct nullb_cmd); |
1763 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1764 | if (g_no_sched) |
1765 | set->flags |= BLK_MQ_F_NO_SCHED; | |
82f402fe JA |
1766 | set->driver_data = NULL; |
1767 | ||
0d06a42f | 1768 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1769 | set->flags |= BLK_MQ_F_BLOCKING; |
1770 | ||
1771 | return blk_mq_alloc_tag_set(set); | |
1772 | } | |
1773 | ||
cedcafad SL |
1774 | static void null_validate_conf(struct nullb_device *dev) |
1775 | { | |
1776 | dev->blocksize = round_down(dev->blocksize, 512); | |
1777 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
1778 | if (dev->use_lightnvm && dev->blocksize != 4096) | |
1779 | dev->blocksize = 4096; | |
1780 | ||
1781 | if (dev->use_lightnvm && dev->queue_mode != NULL_Q_MQ) | |
1782 | dev->queue_mode = NULL_Q_MQ; | |
1783 | ||
1784 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1785 | if (dev->submit_queues != nr_online_nodes) | |
1786 | dev->submit_queues = nr_online_nodes; | |
1787 | } else if (dev->submit_queues > nr_cpu_ids) | |
1788 | dev->submit_queues = nr_cpu_ids; | |
1789 | else if (dev->submit_queues == 0) | |
1790 | dev->submit_queues = 1; | |
1791 | ||
1792 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1793 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1794 | |
1795 | /* Do memory allocation, so set blocking */ | |
1796 | if (dev->memory_backed) | |
1797 | dev->blocking = true; | |
deb78b41 SL |
1798 | else /* cache is meaningless */ |
1799 | dev->cache_size = 0; | |
1800 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1801 | dev->cache_size); | |
eff2c4f1 SL |
1802 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1803 | /* can not stop a queue */ | |
1804 | if (dev->queue_mode == NULL_Q_BIO) | |
1805 | dev->mbps = 0; | |
cedcafad SL |
1806 | } |
1807 | ||
2984c868 | 1808 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1809 | { |
1810 | struct nullb *nullb; | |
dc501dc0 | 1811 | int rv; |
f2298c04 | 1812 | |
cedcafad SL |
1813 | null_validate_conf(dev); |
1814 | ||
2984c868 | 1815 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1816 | if (!nullb) { |
1817 | rv = -ENOMEM; | |
24d2f903 | 1818 | goto out; |
dc501dc0 | 1819 | } |
2984c868 SL |
1820 | nullb->dev = dev; |
1821 | dev->nullb = nullb; | |
f2298c04 JA |
1822 | |
1823 | spin_lock_init(&nullb->lock); | |
1824 | ||
dc501dc0 RE |
1825 | rv = setup_queues(nullb); |
1826 | if (rv) | |
24d2f903 | 1827 | goto out_free_nullb; |
f2298c04 | 1828 | |
2984c868 | 1829 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1830 | if (shared_tags) { |
1831 | nullb->tag_set = &tag_set; | |
1832 | rv = 0; | |
1833 | } else { | |
1834 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1835 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1836 | } |
1837 | ||
dc501dc0 | 1838 | if (rv) |
24d2f903 CH |
1839 | goto out_cleanup_queues; |
1840 | ||
82f402fe | 1841 | nullb->q = blk_mq_init_queue(nullb->tag_set); |
35b489d3 | 1842 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1843 | rv = -ENOMEM; |
24d2f903 | 1844 | goto out_cleanup_tags; |
dc501dc0 | 1845 | } |
82f402fe | 1846 | null_init_queues(nullb); |
2984c868 SL |
1847 | } else if (dev->queue_mode == NULL_Q_BIO) { |
1848 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node); | |
dc501dc0 RE |
1849 | if (!nullb->q) { |
1850 | rv = -ENOMEM; | |
24d2f903 | 1851 | goto out_cleanup_queues; |
dc501dc0 | 1852 | } |
f2298c04 | 1853 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1854 | rv = init_driver_queues(nullb); |
1855 | if (rv) | |
1856 | goto out_cleanup_blk_queue; | |
f2298c04 | 1857 | } else { |
2984c868 SL |
1858 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, |
1859 | dev->home_node); | |
dc501dc0 RE |
1860 | if (!nullb->q) { |
1861 | rv = -ENOMEM; | |
24d2f903 | 1862 | goto out_cleanup_queues; |
dc501dc0 | 1863 | } |
f2298c04 | 1864 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 1865 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
31f9690e JK |
1866 | rv = init_driver_queues(nullb); |
1867 | if (rv) | |
1868 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1869 | } |
1870 | ||
eff2c4f1 SL |
1871 | if (dev->mbps) { |
1872 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1873 | nullb_setup_bwtimer(nullb); | |
1874 | } | |
1875 | ||
deb78b41 SL |
1876 | if (dev->cache_size > 0) { |
1877 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1878 | blk_queue_write_cache(nullb->q, true, true); | |
1879 | blk_queue_flush_queueable(nullb->q, true); | |
1880 | } | |
1881 | ||
f2298c04 JA |
1882 | nullb->q->queuedata = nullb; |
1883 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); | |
b277da0a | 1884 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
f2298c04 | 1885 | |
f2298c04 | 1886 | mutex_lock(&lock); |
94bc02e3 | 1887 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1888 | dev->index = nullb->index; |
f2298c04 JA |
1889 | mutex_unlock(&lock); |
1890 | ||
2984c868 SL |
1891 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1892 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1893 | |
306eb6b4 | 1894 | null_config_discard(nullb); |
f2298c04 | 1895 | |
b2b7e001 MB |
1896 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1897 | ||
2984c868 | 1898 | if (dev->use_lightnvm) |
9ae2d0aa MB |
1899 | rv = null_nvm_register(nullb); |
1900 | else | |
1901 | rv = null_gendisk_register(nullb); | |
b2b7e001 | 1902 | |
9ae2d0aa MB |
1903 | if (rv) |
1904 | goto out_cleanup_blk_queue; | |
a514379b MB |
1905 | |
1906 | mutex_lock(&lock); | |
1907 | list_add_tail(&nullb->list, &nullb_list); | |
1908 | mutex_unlock(&lock); | |
3681c85d | 1909 | |
f2298c04 | 1910 | return 0; |
24d2f903 CH |
1911 | out_cleanup_blk_queue: |
1912 | blk_cleanup_queue(nullb->q); | |
1913 | out_cleanup_tags: | |
2984c868 | 1914 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1915 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1916 | out_cleanup_queues: |
1917 | cleanup_queues(nullb); | |
1918 | out_free_nullb: | |
1919 | kfree(nullb); | |
1920 | out: | |
dc501dc0 | 1921 | return rv; |
f2298c04 JA |
1922 | } |
1923 | ||
1924 | static int __init null_init(void) | |
1925 | { | |
af096e22 | 1926 | int ret = 0; |
f2298c04 | 1927 | unsigned int i; |
af096e22 | 1928 | struct nullb *nullb; |
2984c868 | 1929 | struct nullb_device *dev; |
f2298c04 | 1930 | |
deb78b41 SL |
1931 | /* check for nullb_page.bitmap */ |
1932 | if (sizeof(unsigned long) * 8 - 2 < (PAGE_SIZE >> SECTOR_SHIFT)) | |
1933 | return -EINVAL; | |
f2298c04 | 1934 | |
2984c868 | 1935 | if (g_bs > PAGE_SIZE) { |
9967d8ac R |
1936 | pr_warn("null_blk: invalid block size\n"); |
1937 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1938 | g_bs = PAGE_SIZE; |
9967d8ac | 1939 | } |
f2298c04 | 1940 | |
2984c868 | 1941 | if (g_use_lightnvm && g_bs != 4096) { |
6bb9535b MB |
1942 | pr_warn("null_blk: LightNVM only supports 4k block size\n"); |
1943 | pr_warn("null_blk: defaults block size to 4k\n"); | |
2984c868 | 1944 | g_bs = 4096; |
6bb9535b MB |
1945 | } |
1946 | ||
2984c868 | 1947 | if (g_use_lightnvm && g_queue_mode != NULL_Q_MQ) { |
b2b7e001 MB |
1948 | pr_warn("null_blk: LightNVM only supported for blk-mq\n"); |
1949 | pr_warn("null_blk: defaults queue mode to blk-mq\n"); | |
2984c868 | 1950 | g_queue_mode = NULL_Q_MQ; |
b2b7e001 MB |
1951 | } |
1952 | ||
2984c868 SL |
1953 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1954 | if (g_submit_queues != nr_online_nodes) { | |
558ab300 | 1955 | pr_warn("null_blk: submit_queues param is set to %u.\n", |
d15ee6b1 | 1956 | nr_online_nodes); |
2984c868 | 1957 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1958 | } |
2984c868 SL |
1959 | } else if (g_submit_queues > nr_cpu_ids) |
1960 | g_submit_queues = nr_cpu_ids; | |
1961 | else if (g_submit_queues <= 0) | |
1962 | g_submit_queues = 1; | |
f2298c04 | 1963 | |
2984c868 SL |
1964 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1965 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1966 | if (ret) |
1967 | return ret; | |
1968 | } | |
1969 | ||
3bf2bd20 SL |
1970 | config_group_init(&nullb_subsys.su_group); |
1971 | mutex_init(&nullb_subsys.su_mutex); | |
1972 | ||
1973 | ret = configfs_register_subsystem(&nullb_subsys); | |
1974 | if (ret) | |
1975 | goto err_tagset; | |
1976 | ||
f2298c04 JA |
1977 | mutex_init(&lock); |
1978 | ||
f2298c04 | 1979 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1980 | if (null_major < 0) { |
1981 | ret = null_major; | |
3bf2bd20 | 1982 | goto err_conf; |
db2d153d | 1983 | } |
f2298c04 | 1984 | |
2984c868 | 1985 | if (g_use_lightnvm) { |
6bb9535b MB |
1986 | ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64), |
1987 | 0, 0, NULL); | |
1988 | if (!ppa_cache) { | |
1989 | pr_err("null_blk: unable to create ppa cache\n"); | |
af096e22 MH |
1990 | ret = -ENOMEM; |
1991 | goto err_ppa; | |
6bb9535b MB |
1992 | } |
1993 | } | |
1994 | ||
f2298c04 | 1995 | for (i = 0; i < nr_devices; i++) { |
2984c868 | 1996 | dev = null_alloc_dev(); |
30c516d7 WY |
1997 | if (!dev) { |
1998 | ret = -ENOMEM; | |
2984c868 | 1999 | goto err_dev; |
30c516d7 | 2000 | } |
2984c868 SL |
2001 | ret = null_add_dev(dev); |
2002 | if (ret) { | |
2003 | null_free_dev(dev); | |
af096e22 | 2004 | goto err_dev; |
2984c868 | 2005 | } |
f2298c04 JA |
2006 | } |
2007 | ||
2008 | pr_info("null: module loaded\n"); | |
2009 | return 0; | |
af096e22 MH |
2010 | |
2011 | err_dev: | |
2012 | while (!list_empty(&nullb_list)) { | |
2013 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 2014 | dev = nullb->dev; |
af096e22 | 2015 | null_del_dev(nullb); |
2984c868 | 2016 | null_free_dev(dev); |
af096e22 | 2017 | } |
6bb9535b | 2018 | kmem_cache_destroy(ppa_cache); |
af096e22 MH |
2019 | err_ppa: |
2020 | unregister_blkdev(null_major, "nullb"); | |
3bf2bd20 SL |
2021 | err_conf: |
2022 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 2023 | err_tagset: |
2984c868 | 2024 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 2025 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 2026 | return ret; |
f2298c04 JA |
2027 | } |
2028 | ||
2029 | static void __exit null_exit(void) | |
2030 | { | |
2031 | struct nullb *nullb; | |
2032 | ||
3bf2bd20 SL |
2033 | configfs_unregister_subsystem(&nullb_subsys); |
2034 | ||
f2298c04 JA |
2035 | unregister_blkdev(null_major, "nullb"); |
2036 | ||
2037 | mutex_lock(&lock); | |
2038 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
2039 | struct nullb_device *dev; |
2040 | ||
f2298c04 | 2041 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 2042 | dev = nullb->dev; |
f2298c04 | 2043 | null_del_dev(nullb); |
2984c868 | 2044 | null_free_dev(dev); |
f2298c04 JA |
2045 | } |
2046 | mutex_unlock(&lock); | |
6bb9535b | 2047 | |
2984c868 | 2048 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe JA |
2049 | blk_mq_free_tag_set(&tag_set); |
2050 | ||
6bb9535b | 2051 | kmem_cache_destroy(ppa_cache); |
f2298c04 JA |
2052 | } |
2053 | ||
2054 | module_init(null_init); | |
2055 | module_exit(null_exit); | |
2056 | ||
231b3db1 | 2057 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 2058 | MODULE_LICENSE("GPL"); |