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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 | ||
9a7e1b43 | 71 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
72 | /* |
73 | * nullb_page is a page in memory for nullb devices. | |
74 | * | |
75 | * @page: The page holding the data. | |
76 | * @bitmap: The bitmap represents which sector in the page has data. | |
77 | * Each bit represents one block size. For example, sector 8 | |
78 | * will use the 7th bit | |
deb78b41 SL |
79 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
80 | * page is being flushing to storage. FREE means the cache page is freed and | |
81 | * should be skipped from flushing to storage. Please see | |
82 | * null_make_cache_space | |
5bcd0e0c SL |
83 | */ |
84 | struct nullb_page { | |
85 | struct page *page; | |
9a7e1b43 | 86 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 87 | }; |
9a7e1b43 ML |
88 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
89 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 90 | |
2984c868 SL |
91 | struct nullb_device { |
92 | struct nullb *nullb; | |
3bf2bd20 | 93 | struct config_item item; |
5bcd0e0c | 94 | struct radix_tree_root data; /* data stored in the disk */ |
deb78b41 | 95 | struct radix_tree_root cache; /* disk cache data */ |
3bf2bd20 | 96 | unsigned long flags; /* device flags */ |
deb78b41 | 97 | unsigned int curr_cache; |
2f54a613 | 98 | struct badblocks badblocks; |
2984c868 SL |
99 | |
100 | unsigned long size; /* device size in MB */ | |
101 | unsigned long completion_nsec; /* time in ns to complete a request */ | |
deb78b41 | 102 | unsigned long cache_size; /* disk cache size in MB */ |
2984c868 SL |
103 | unsigned int submit_queues; /* number of submission queues */ |
104 | unsigned int home_node; /* home node for the device */ | |
105 | unsigned int queue_mode; /* block interface */ | |
106 | unsigned int blocksize; /* block size */ | |
107 | unsigned int irqmode; /* IRQ completion handler */ | |
108 | unsigned int hw_queue_depth; /* queue depth */ | |
cedcafad | 109 | unsigned int index; /* index of the disk, only valid with a disk */ |
eff2c4f1 | 110 | unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */ |
2984c868 SL |
111 | bool use_lightnvm; /* register as a LightNVM device */ |
112 | bool blocking; /* blocking blk-mq device */ | |
113 | bool use_per_node_hctx; /* use per-node allocation for hardware context */ | |
cedcafad | 114 | bool power; /* power on/off the device */ |
5bcd0e0c | 115 | bool memory_backed; /* if data is stored in memory */ |
306eb6b4 | 116 | bool discard; /* if support discard */ |
2984c868 SL |
117 | }; |
118 | ||
f2298c04 | 119 | struct nullb { |
2984c868 | 120 | struct nullb_device *dev; |
f2298c04 JA |
121 | struct list_head list; |
122 | unsigned int index; | |
123 | struct request_queue *q; | |
124 | struct gendisk *disk; | |
b0b4e09c | 125 | struct nvm_dev *ndev; |
82f402fe JA |
126 | struct blk_mq_tag_set *tag_set; |
127 | struct blk_mq_tag_set __tag_set; | |
f2298c04 | 128 | unsigned int queue_depth; |
eff2c4f1 SL |
129 | atomic_long_t cur_bytes; |
130 | struct hrtimer bw_timer; | |
deb78b41 | 131 | unsigned long cache_flush_pos; |
f2298c04 JA |
132 | spinlock_t lock; |
133 | ||
134 | struct nullb_queue *queues; | |
135 | unsigned int nr_queues; | |
b2b7e001 | 136 | char disk_name[DISK_NAME_LEN]; |
f2298c04 JA |
137 | }; |
138 | ||
139 | static LIST_HEAD(nullb_list); | |
140 | static struct mutex lock; | |
141 | static int null_major; | |
94bc02e3 | 142 | static DEFINE_IDA(nullb_indexes); |
6bb9535b | 143 | static struct kmem_cache *ppa_cache; |
82f402fe | 144 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 145 | |
f2298c04 JA |
146 | enum { |
147 | NULL_IRQ_NONE = 0, | |
148 | NULL_IRQ_SOFTIRQ = 1, | |
149 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 150 | }; |
f2298c04 | 151 | |
ce2c350b | 152 | enum { |
f2298c04 JA |
153 | NULL_Q_BIO = 0, |
154 | NULL_Q_RQ = 1, | |
155 | NULL_Q_MQ = 2, | |
156 | }; | |
157 | ||
b3cffc38 | 158 | static int g_no_sched; |
159 | module_param_named(no_sched, g_no_sched, int, S_IRUGO); | |
160 | MODULE_PARM_DESC(no_sched, "No io scheduler"); | |
161 | ||
2984c868 SL |
162 | static int g_submit_queues = 1; |
163 | module_param_named(submit_queues, g_submit_queues, int, S_IRUGO); | |
f2298c04 JA |
164 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
165 | ||
2984c868 SL |
166 | static int g_home_node = NUMA_NO_NODE; |
167 | module_param_named(home_node, g_home_node, int, S_IRUGO); | |
f2298c04 JA |
168 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
169 | ||
2984c868 | 170 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
171 | |
172 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
173 | { | |
174 | int ret, new_val; | |
175 | ||
176 | ret = kstrtoint(str, 10, &new_val); | |
177 | if (ret) | |
178 | return -EINVAL; | |
179 | ||
180 | if (new_val < min || new_val > max) | |
181 | return -EINVAL; | |
182 | ||
183 | *val = new_val; | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
188 | { | |
2984c868 | 189 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
190 | } |
191 | ||
9c27847d | 192 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
193 | .set = null_set_queue_mode, |
194 | .get = param_get_int, | |
195 | }; | |
196 | ||
2984c868 | 197 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, S_IRUGO); |
54ae81cd | 198 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 199 | |
2984c868 SL |
200 | static int g_gb = 250; |
201 | module_param_named(gb, g_gb, int, S_IRUGO); | |
f2298c04 JA |
202 | MODULE_PARM_DESC(gb, "Size in GB"); |
203 | ||
2984c868 SL |
204 | static int g_bs = 512; |
205 | module_param_named(bs, g_bs, int, S_IRUGO); | |
f2298c04 JA |
206 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
207 | ||
82f402fe | 208 | static int nr_devices = 1; |
f2298c04 JA |
209 | module_param(nr_devices, int, S_IRUGO); |
210 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); | |
211 | ||
2984c868 SL |
212 | static bool g_use_lightnvm; |
213 | module_param_named(use_lightnvm, g_use_lightnvm, bool, S_IRUGO); | |
b2b7e001 MB |
214 | MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); |
215 | ||
2984c868 SL |
216 | static bool g_blocking; |
217 | module_param_named(blocking, g_blocking, bool, S_IRUGO); | |
db5bcf87 JA |
218 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
219 | ||
82f402fe JA |
220 | static bool shared_tags; |
221 | module_param(shared_tags, bool, S_IRUGO); | |
222 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); | |
223 | ||
2984c868 | 224 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
225 | |
226 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
227 | { | |
2984c868 | 228 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
229 | NULL_IRQ_TIMER); |
230 | } | |
231 | ||
9c27847d | 232 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
233 | .set = null_set_irqmode, |
234 | .get = param_get_int, | |
235 | }; | |
236 | ||
2984c868 | 237 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, S_IRUGO); |
f2298c04 JA |
238 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
239 | ||
2984c868 SL |
240 | static unsigned long g_completion_nsec = 10000; |
241 | module_param_named(completion_nsec, g_completion_nsec, ulong, S_IRUGO); | |
f2298c04 JA |
242 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
243 | ||
2984c868 SL |
244 | static int g_hw_queue_depth = 64; |
245 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, S_IRUGO); | |
f2298c04 JA |
246 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
247 | ||
2984c868 SL |
248 | static bool g_use_per_node_hctx; |
249 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, S_IRUGO); | |
20005244 | 250 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 251 | |
3bf2bd20 SL |
252 | static struct nullb_device *null_alloc_dev(void); |
253 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
254 | static void null_del_dev(struct nullb *nullb); |
255 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 256 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
257 | |
258 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
259 | { | |
260 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
261 | } | |
262 | ||
263 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
264 | { | |
265 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
266 | } | |
267 | ||
268 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
269 | char *page) | |
270 | { | |
271 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
272 | } | |
273 | ||
274 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
275 | { | |
276 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
277 | } | |
278 | ||
279 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
280 | const char *page, size_t count) | |
281 | { | |
282 | unsigned int tmp; | |
283 | int result; | |
284 | ||
285 | result = kstrtouint(page, 0, &tmp); | |
286 | if (result) | |
287 | return result; | |
288 | ||
289 | *val = tmp; | |
290 | return count; | |
291 | } | |
292 | ||
293 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
294 | const char *page, size_t count) | |
295 | { | |
296 | int result; | |
297 | unsigned long tmp; | |
298 | ||
299 | result = kstrtoul(page, 0, &tmp); | |
300 | if (result) | |
301 | return result; | |
302 | ||
303 | *val = tmp; | |
304 | return count; | |
305 | } | |
306 | ||
307 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
308 | size_t count) | |
309 | { | |
310 | bool tmp; | |
311 | int result; | |
312 | ||
313 | result = kstrtobool(page, &tmp); | |
314 | if (result) | |
315 | return result; | |
316 | ||
317 | *val = tmp; | |
318 | return count; | |
319 | } | |
320 | ||
321 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
322 | #define NULLB_DEVICE_ATTR(NAME, TYPE) \ | |
323 | static ssize_t \ | |
324 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
325 | { \ | |
326 | return nullb_device_##TYPE##_attr_show( \ | |
327 | to_nullb_device(item)->NAME, page); \ | |
328 | } \ | |
329 | static ssize_t \ | |
330 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
331 | size_t count) \ | |
332 | { \ | |
333 | if (test_bit(NULLB_DEV_FL_CONFIGURED, &to_nullb_device(item)->flags)) \ | |
334 | return -EBUSY; \ | |
335 | return nullb_device_##TYPE##_attr_store( \ | |
336 | &to_nullb_device(item)->NAME, page, count); \ | |
337 | } \ | |
338 | CONFIGFS_ATTR(nullb_device_, NAME); | |
339 | ||
340 | NULLB_DEVICE_ATTR(size, ulong); | |
341 | NULLB_DEVICE_ATTR(completion_nsec, ulong); | |
342 | NULLB_DEVICE_ATTR(submit_queues, uint); | |
343 | NULLB_DEVICE_ATTR(home_node, uint); | |
344 | NULLB_DEVICE_ATTR(queue_mode, uint); | |
345 | NULLB_DEVICE_ATTR(blocksize, uint); | |
346 | NULLB_DEVICE_ATTR(irqmode, uint); | |
347 | NULLB_DEVICE_ATTR(hw_queue_depth, uint); | |
cedcafad | 348 | NULLB_DEVICE_ATTR(index, uint); |
3bf2bd20 SL |
349 | NULLB_DEVICE_ATTR(use_lightnvm, bool); |
350 | NULLB_DEVICE_ATTR(blocking, bool); | |
351 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool); | |
5bcd0e0c | 352 | NULLB_DEVICE_ATTR(memory_backed, bool); |
306eb6b4 | 353 | NULLB_DEVICE_ATTR(discard, bool); |
eff2c4f1 | 354 | NULLB_DEVICE_ATTR(mbps, uint); |
deb78b41 | 355 | NULLB_DEVICE_ATTR(cache_size, ulong); |
3bf2bd20 | 356 | |
cedcafad SL |
357 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
358 | { | |
359 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
360 | } | |
361 | ||
362 | static ssize_t nullb_device_power_store(struct config_item *item, | |
363 | const char *page, size_t count) | |
364 | { | |
365 | struct nullb_device *dev = to_nullb_device(item); | |
366 | bool newp = false; | |
367 | ssize_t ret; | |
368 | ||
369 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
370 | if (ret < 0) | |
371 | return ret; | |
372 | ||
373 | if (!dev->power && newp) { | |
374 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
375 | return count; | |
376 | if (null_add_dev(dev)) { | |
377 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
378 | return -ENOMEM; | |
379 | } | |
380 | ||
381 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
382 | dev->power = newp; | |
b3c30512 | 383 | } else if (dev->power && !newp) { |
cedcafad SL |
384 | mutex_lock(&lock); |
385 | dev->power = newp; | |
386 | null_del_dev(dev->nullb); | |
387 | mutex_unlock(&lock); | |
388 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
389 | } | |
390 | ||
391 | return count; | |
392 | } | |
393 | ||
394 | CONFIGFS_ATTR(nullb_device_, power); | |
395 | ||
2f54a613 SL |
396 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
397 | { | |
398 | struct nullb_device *t_dev = to_nullb_device(item); | |
399 | ||
400 | return badblocks_show(&t_dev->badblocks, page, 0); | |
401 | } | |
402 | ||
403 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
404 | const char *page, size_t count) | |
405 | { | |
406 | struct nullb_device *t_dev = to_nullb_device(item); | |
407 | char *orig, *buf, *tmp; | |
408 | u64 start, end; | |
409 | int ret; | |
410 | ||
411 | orig = kstrndup(page, count, GFP_KERNEL); | |
412 | if (!orig) | |
413 | return -ENOMEM; | |
414 | ||
415 | buf = strstrip(orig); | |
416 | ||
417 | ret = -EINVAL; | |
418 | if (buf[0] != '+' && buf[0] != '-') | |
419 | goto out; | |
420 | tmp = strchr(&buf[1], '-'); | |
421 | if (!tmp) | |
422 | goto out; | |
423 | *tmp = '\0'; | |
424 | ret = kstrtoull(buf + 1, 0, &start); | |
425 | if (ret) | |
426 | goto out; | |
427 | ret = kstrtoull(tmp + 1, 0, &end); | |
428 | if (ret) | |
429 | goto out; | |
430 | ret = -EINVAL; | |
431 | if (start > end) | |
432 | goto out; | |
433 | /* enable badblocks */ | |
434 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
435 | if (buf[0] == '+') | |
436 | ret = badblocks_set(&t_dev->badblocks, start, | |
437 | end - start + 1, 1); | |
438 | else | |
439 | ret = badblocks_clear(&t_dev->badblocks, start, | |
440 | end - start + 1); | |
441 | if (ret == 0) | |
442 | ret = count; | |
443 | out: | |
444 | kfree(orig); | |
445 | return ret; | |
446 | } | |
447 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
448 | ||
3bf2bd20 SL |
449 | static struct configfs_attribute *nullb_device_attrs[] = { |
450 | &nullb_device_attr_size, | |
451 | &nullb_device_attr_completion_nsec, | |
452 | &nullb_device_attr_submit_queues, | |
453 | &nullb_device_attr_home_node, | |
454 | &nullb_device_attr_queue_mode, | |
455 | &nullb_device_attr_blocksize, | |
456 | &nullb_device_attr_irqmode, | |
457 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 458 | &nullb_device_attr_index, |
3bf2bd20 SL |
459 | &nullb_device_attr_use_lightnvm, |
460 | &nullb_device_attr_blocking, | |
461 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 462 | &nullb_device_attr_power, |
5bcd0e0c | 463 | &nullb_device_attr_memory_backed, |
306eb6b4 | 464 | &nullb_device_attr_discard, |
eff2c4f1 | 465 | &nullb_device_attr_mbps, |
deb78b41 | 466 | &nullb_device_attr_cache_size, |
2f54a613 | 467 | &nullb_device_attr_badblocks, |
3bf2bd20 SL |
468 | NULL, |
469 | }; | |
470 | ||
471 | static void nullb_device_release(struct config_item *item) | |
472 | { | |
5bcd0e0c SL |
473 | struct nullb_device *dev = to_nullb_device(item); |
474 | ||
deb78b41 | 475 | null_free_device_storage(dev, false); |
5bcd0e0c | 476 | null_free_dev(dev); |
3bf2bd20 SL |
477 | } |
478 | ||
479 | static struct configfs_item_operations nullb_device_ops = { | |
480 | .release = nullb_device_release, | |
481 | }; | |
482 | ||
e1919dff | 483 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
484 | .ct_item_ops = &nullb_device_ops, |
485 | .ct_attrs = nullb_device_attrs, | |
486 | .ct_owner = THIS_MODULE, | |
487 | }; | |
488 | ||
489 | static struct | |
490 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
491 | { | |
492 | struct nullb_device *dev; | |
493 | ||
494 | dev = null_alloc_dev(); | |
495 | if (!dev) | |
496 | return ERR_PTR(-ENOMEM); | |
497 | ||
498 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
499 | ||
500 | return &dev->item; | |
501 | } | |
502 | ||
503 | static void | |
504 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
505 | { | |
cedcafad SL |
506 | struct nullb_device *dev = to_nullb_device(item); |
507 | ||
508 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
509 | mutex_lock(&lock); | |
510 | dev->power = false; | |
511 | null_del_dev(dev->nullb); | |
512 | mutex_unlock(&lock); | |
513 | } | |
514 | ||
3bf2bd20 SL |
515 | config_item_put(item); |
516 | } | |
517 | ||
518 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
519 | { | |
2f54a613 | 520 | return snprintf(page, PAGE_SIZE, "memory_backed,discard,bandwidth,cache,badblocks\n"); |
3bf2bd20 SL |
521 | } |
522 | ||
523 | CONFIGFS_ATTR_RO(memb_group_, features); | |
524 | ||
525 | static struct configfs_attribute *nullb_group_attrs[] = { | |
526 | &memb_group_attr_features, | |
527 | NULL, | |
528 | }; | |
529 | ||
530 | static struct configfs_group_operations nullb_group_ops = { | |
531 | .make_item = nullb_group_make_item, | |
532 | .drop_item = nullb_group_drop_item, | |
533 | }; | |
534 | ||
e1919dff | 535 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
536 | .ct_group_ops = &nullb_group_ops, |
537 | .ct_attrs = nullb_group_attrs, | |
538 | .ct_owner = THIS_MODULE, | |
539 | }; | |
540 | ||
541 | static struct configfs_subsystem nullb_subsys = { | |
542 | .su_group = { | |
543 | .cg_item = { | |
544 | .ci_namebuf = "nullb", | |
545 | .ci_type = &nullb_group_type, | |
546 | }, | |
547 | }, | |
548 | }; | |
549 | ||
deb78b41 SL |
550 | static inline int null_cache_active(struct nullb *nullb) |
551 | { | |
552 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
553 | } | |
554 | ||
2984c868 SL |
555 | static struct nullb_device *null_alloc_dev(void) |
556 | { | |
557 | struct nullb_device *dev; | |
558 | ||
559 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
560 | if (!dev) | |
561 | return NULL; | |
5bcd0e0c | 562 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 563 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
564 | if (badblocks_init(&dev->badblocks, 0)) { |
565 | kfree(dev); | |
566 | return NULL; | |
567 | } | |
568 | ||
2984c868 SL |
569 | dev->size = g_gb * 1024; |
570 | dev->completion_nsec = g_completion_nsec; | |
571 | dev->submit_queues = g_submit_queues; | |
572 | dev->home_node = g_home_node; | |
573 | dev->queue_mode = g_queue_mode; | |
574 | dev->blocksize = g_bs; | |
575 | dev->irqmode = g_irqmode; | |
576 | dev->hw_queue_depth = g_hw_queue_depth; | |
577 | dev->use_lightnvm = g_use_lightnvm; | |
578 | dev->blocking = g_blocking; | |
579 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
580 | return dev; | |
581 | } | |
582 | ||
583 | static void null_free_dev(struct nullb_device *dev) | |
584 | { | |
1addb798 DD |
585 | if (!dev) |
586 | return; | |
587 | ||
588 | badblocks_exit(&dev->badblocks); | |
2984c868 SL |
589 | kfree(dev); |
590 | } | |
591 | ||
f2298c04 JA |
592 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
593 | { | |
594 | clear_bit_unlock(tag, nq->tag_map); | |
595 | ||
596 | if (waitqueue_active(&nq->wait)) | |
597 | wake_up(&nq->wait); | |
598 | } | |
599 | ||
600 | static unsigned int get_tag(struct nullb_queue *nq) | |
601 | { | |
602 | unsigned int tag; | |
603 | ||
604 | do { | |
605 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
606 | if (tag >= nq->queue_depth) | |
607 | return -1U; | |
608 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
609 | ||
610 | return tag; | |
611 | } | |
612 | ||
613 | static void free_cmd(struct nullb_cmd *cmd) | |
614 | { | |
615 | put_tag(cmd->nq, cmd->tag); | |
616 | } | |
617 | ||
3c395a96 PV |
618 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
619 | ||
f2298c04 JA |
620 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
621 | { | |
622 | struct nullb_cmd *cmd; | |
623 | unsigned int tag; | |
624 | ||
625 | tag = get_tag(nq); | |
626 | if (tag != -1U) { | |
627 | cmd = &nq->cmds[tag]; | |
628 | cmd->tag = tag; | |
629 | cmd->nq = nq; | |
2984c868 | 630 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
631 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
632 | HRTIMER_MODE_REL); | |
633 | cmd->timer.function = null_cmd_timer_expired; | |
634 | } | |
f2298c04 JA |
635 | return cmd; |
636 | } | |
637 | ||
638 | return NULL; | |
639 | } | |
640 | ||
641 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
642 | { | |
643 | struct nullb_cmd *cmd; | |
644 | DEFINE_WAIT(wait); | |
645 | ||
646 | cmd = __alloc_cmd(nq); | |
647 | if (cmd || !can_wait) | |
648 | return cmd; | |
649 | ||
650 | do { | |
651 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
652 | cmd = __alloc_cmd(nq); | |
653 | if (cmd) | |
654 | break; | |
655 | ||
656 | io_schedule(); | |
657 | } while (1); | |
658 | ||
659 | finish_wait(&nq->wait, &wait); | |
660 | return cmd; | |
661 | } | |
662 | ||
663 | static void end_cmd(struct nullb_cmd *cmd) | |
664 | { | |
cf8ecc5a | 665 | struct request_queue *q = NULL; |
2984c868 | 666 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 667 | |
e8271201 MK |
668 | if (cmd->rq) |
669 | q = cmd->rq->q; | |
670 | ||
ce2c350b CH |
671 | switch (queue_mode) { |
672 | case NULL_Q_MQ: | |
5bcd0e0c | 673 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b CH |
674 | return; |
675 | case NULL_Q_RQ: | |
676 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
5bcd0e0c | 677 | blk_end_request_all(cmd->rq, cmd->error); |
ce2c350b CH |
678 | break; |
679 | case NULL_Q_BIO: | |
5bcd0e0c | 680 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 681 | bio_endio(cmd->bio); |
48cc661e | 682 | break; |
ce2c350b | 683 | } |
f2298c04 | 684 | |
48cc661e JA |
685 | free_cmd(cmd); |
686 | ||
cf8ecc5a | 687 | /* Restart queue if needed, as we are freeing a tag */ |
48cc661e | 688 | if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) { |
cf8ecc5a AA |
689 | unsigned long flags; |
690 | ||
691 | spin_lock_irqsave(q->queue_lock, flags); | |
48cc661e | 692 | blk_start_queue_async(q); |
cf8ecc5a | 693 | spin_unlock_irqrestore(q->queue_lock, flags); |
f2298c04 | 694 | } |
cf8ecc5a AA |
695 | } |
696 | ||
697 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
698 | { | |
699 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
700 | |
701 | return HRTIMER_NORESTART; | |
702 | } | |
703 | ||
704 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
705 | { | |
2984c868 | 706 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 707 | |
3c395a96 | 708 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
709 | } |
710 | ||
711 | static void null_softirq_done_fn(struct request *rq) | |
712 | { | |
2984c868 SL |
713 | struct nullb *nullb = rq->q->queuedata; |
714 | ||
715 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
d891fa70 JA |
716 | end_cmd(blk_mq_rq_to_pdu(rq)); |
717 | else | |
718 | end_cmd(rq->special); | |
f2298c04 JA |
719 | } |
720 | ||
5bcd0e0c SL |
721 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
722 | { | |
723 | struct nullb_page *t_page; | |
724 | ||
725 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
726 | if (!t_page) | |
727 | goto out; | |
728 | ||
729 | t_page->page = alloc_pages(gfp_flags, 0); | |
730 | if (!t_page->page) | |
731 | goto out_freepage; | |
732 | ||
9a7e1b43 | 733 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
734 | return t_page; |
735 | out_freepage: | |
736 | kfree(t_page); | |
737 | out: | |
738 | return NULL; | |
739 | } | |
740 | ||
741 | static void null_free_page(struct nullb_page *t_page) | |
742 | { | |
9a7e1b43 ML |
743 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
744 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 745 | return; |
5bcd0e0c SL |
746 | __free_page(t_page->page); |
747 | kfree(t_page); | |
748 | } | |
749 | ||
9a7e1b43 ML |
750 | static bool null_page_empty(struct nullb_page *page) |
751 | { | |
752 | int size = MAP_SZ - 2; | |
753 | ||
754 | return find_first_bit(page->bitmap, size) == size; | |
755 | } | |
756 | ||
deb78b41 SL |
757 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
758 | bool is_cache) | |
5bcd0e0c SL |
759 | { |
760 | unsigned int sector_bit; | |
761 | u64 idx; | |
762 | struct nullb_page *t_page, *ret; | |
763 | struct radix_tree_root *root; | |
764 | ||
deb78b41 | 765 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
766 | idx = sector >> PAGE_SECTORS_SHIFT; |
767 | sector_bit = (sector & SECTOR_MASK); | |
768 | ||
769 | t_page = radix_tree_lookup(root, idx); | |
770 | if (t_page) { | |
9a7e1b43 | 771 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 772 | |
9a7e1b43 | 773 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
774 | ret = radix_tree_delete_item(root, idx, t_page); |
775 | WARN_ON(ret != t_page); | |
776 | null_free_page(ret); | |
deb78b41 SL |
777 | if (is_cache) |
778 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
779 | } |
780 | } | |
781 | } | |
782 | ||
783 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 784 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
785 | { |
786 | struct radix_tree_root *root; | |
787 | ||
deb78b41 | 788 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
789 | |
790 | if (radix_tree_insert(root, idx, t_page)) { | |
791 | null_free_page(t_page); | |
792 | t_page = radix_tree_lookup(root, idx); | |
793 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
794 | } else if (is_cache) |
795 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
796 | |
797 | return t_page; | |
798 | } | |
799 | ||
deb78b41 | 800 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
801 | { |
802 | unsigned long pos = 0; | |
803 | int nr_pages; | |
804 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
805 | struct radix_tree_root *root; | |
806 | ||
deb78b41 | 807 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
808 | |
809 | do { | |
810 | int i; | |
811 | ||
812 | nr_pages = radix_tree_gang_lookup(root, | |
813 | (void **)t_pages, pos, FREE_BATCH); | |
814 | ||
815 | for (i = 0; i < nr_pages; i++) { | |
816 | pos = t_pages[i]->page->index; | |
817 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
818 | WARN_ON(ret != t_pages[i]); | |
819 | null_free_page(ret); | |
820 | } | |
821 | ||
822 | pos++; | |
823 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
824 | |
825 | if (is_cache) | |
826 | dev->curr_cache = 0; | |
5bcd0e0c SL |
827 | } |
828 | ||
deb78b41 SL |
829 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
830 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
831 | { |
832 | unsigned int sector_bit; | |
833 | u64 idx; | |
834 | struct nullb_page *t_page; | |
deb78b41 | 835 | struct radix_tree_root *root; |
5bcd0e0c SL |
836 | |
837 | idx = sector >> PAGE_SECTORS_SHIFT; | |
838 | sector_bit = (sector & SECTOR_MASK); | |
839 | ||
deb78b41 SL |
840 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
841 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
842 | WARN_ON(t_page && t_page->page->index != idx); |
843 | ||
9a7e1b43 | 844 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
845 | return t_page; |
846 | ||
847 | return NULL; | |
848 | } | |
849 | ||
deb78b41 SL |
850 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
851 | sector_t sector, bool for_write, bool ignore_cache) | |
852 | { | |
853 | struct nullb_page *page = NULL; | |
854 | ||
855 | if (!ignore_cache) | |
856 | page = __null_lookup_page(nullb, sector, for_write, true); | |
857 | if (page) | |
858 | return page; | |
859 | return __null_lookup_page(nullb, sector, for_write, false); | |
860 | } | |
861 | ||
5bcd0e0c | 862 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
deb78b41 | 863 | sector_t sector, bool ignore_cache) |
5bcd0e0c SL |
864 | { |
865 | u64 idx; | |
866 | struct nullb_page *t_page; | |
867 | ||
deb78b41 | 868 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
869 | if (t_page) |
870 | return t_page; | |
871 | ||
872 | spin_unlock_irq(&nullb->lock); | |
873 | ||
874 | t_page = null_alloc_page(GFP_NOIO); | |
875 | if (!t_page) | |
876 | goto out_lock; | |
877 | ||
878 | if (radix_tree_preload(GFP_NOIO)) | |
879 | goto out_freepage; | |
880 | ||
881 | spin_lock_irq(&nullb->lock); | |
882 | idx = sector >> PAGE_SECTORS_SHIFT; | |
883 | t_page->page->index = idx; | |
deb78b41 | 884 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
885 | radix_tree_preload_end(); |
886 | ||
887 | return t_page; | |
888 | out_freepage: | |
889 | null_free_page(t_page); | |
890 | out_lock: | |
891 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
892 | return null_lookup_page(nullb, sector, true, ignore_cache); |
893 | } | |
894 | ||
895 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
896 | { | |
897 | int i; | |
898 | unsigned int offset; | |
899 | u64 idx; | |
900 | struct nullb_page *t_page, *ret; | |
901 | void *dst, *src; | |
902 | ||
903 | idx = c_page->page->index; | |
904 | ||
905 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
906 | ||
9a7e1b43 ML |
907 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
908 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 909 | null_free_page(c_page); |
9a7e1b43 | 910 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
911 | ret = radix_tree_delete_item(&nullb->dev->data, |
912 | idx, t_page); | |
913 | null_free_page(t_page); | |
914 | } | |
915 | return 0; | |
916 | } | |
917 | ||
918 | if (!t_page) | |
919 | return -ENOMEM; | |
920 | ||
921 | src = kmap_atomic(c_page->page); | |
922 | dst = kmap_atomic(t_page->page); | |
923 | ||
924 | for (i = 0; i < PAGE_SECTORS; | |
925 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
9a7e1b43 | 926 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
927 | offset = (i << SECTOR_SHIFT); |
928 | memcpy(dst + offset, src + offset, | |
929 | nullb->dev->blocksize); | |
9a7e1b43 | 930 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
931 | } |
932 | } | |
933 | ||
934 | kunmap_atomic(dst); | |
935 | kunmap_atomic(src); | |
936 | ||
937 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
938 | null_free_page(ret); | |
939 | nullb->dev->curr_cache -= PAGE_SIZE; | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
944 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 945 | { |
deb78b41 SL |
946 | int i, err, nr_pages; |
947 | struct nullb_page *c_pages[FREE_BATCH]; | |
948 | unsigned long flushed = 0, one_round; | |
949 | ||
950 | again: | |
951 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
952 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
953 | return 0; | |
954 | ||
955 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
956 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
957 | /* | |
958 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
959 | * avoid race, we don't allow page free | |
960 | */ | |
961 | for (i = 0; i < nr_pages; i++) { | |
962 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
963 | /* | |
964 | * We found the page which is being flushed to disk by other | |
965 | * threads | |
966 | */ | |
9a7e1b43 | 967 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
968 | c_pages[i] = NULL; |
969 | else | |
9a7e1b43 | 970 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
971 | } |
972 | ||
973 | one_round = 0; | |
974 | for (i = 0; i < nr_pages; i++) { | |
975 | if (c_pages[i] == NULL) | |
976 | continue; | |
977 | err = null_flush_cache_page(nullb, c_pages[i]); | |
978 | if (err) | |
979 | return err; | |
980 | one_round++; | |
981 | } | |
982 | flushed += one_round << PAGE_SHIFT; | |
983 | ||
984 | if (n > flushed) { | |
985 | if (nr_pages == 0) | |
986 | nullb->cache_flush_pos = 0; | |
987 | if (one_round == 0) { | |
988 | /* give other threads a chance */ | |
989 | spin_unlock_irq(&nullb->lock); | |
990 | spin_lock_irq(&nullb->lock); | |
991 | } | |
992 | goto again; | |
993 | } | |
994 | return 0; | |
5bcd0e0c SL |
995 | } |
996 | ||
997 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 998 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
999 | { |
1000 | size_t temp, count = 0; | |
1001 | unsigned int offset; | |
1002 | struct nullb_page *t_page; | |
1003 | void *dst, *src; | |
1004 | ||
1005 | while (count < n) { | |
1006 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1007 | ||
deb78b41 SL |
1008 | if (null_cache_active(nullb) && !is_fua) |
1009 | null_make_cache_space(nullb, PAGE_SIZE); | |
1010 | ||
5bcd0e0c | 1011 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
1012 | t_page = null_insert_page(nullb, sector, |
1013 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
1014 | if (!t_page) |
1015 | return -ENOSPC; | |
1016 | ||
1017 | src = kmap_atomic(source); | |
1018 | dst = kmap_atomic(t_page->page); | |
1019 | memcpy(dst + offset, src + off + count, temp); | |
1020 | kunmap_atomic(dst); | |
1021 | kunmap_atomic(src); | |
1022 | ||
9a7e1b43 | 1023 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 1024 | |
deb78b41 SL |
1025 | if (is_fua) |
1026 | null_free_sector(nullb, sector, true); | |
1027 | ||
5bcd0e0c SL |
1028 | count += temp; |
1029 | sector += temp >> SECTOR_SHIFT; | |
1030 | } | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1035 | unsigned int off, sector_t sector, size_t n) | |
1036 | { | |
1037 | size_t temp, count = 0; | |
1038 | unsigned int offset; | |
1039 | struct nullb_page *t_page; | |
1040 | void *dst, *src; | |
1041 | ||
1042 | while (count < n) { | |
1043 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1044 | ||
1045 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1046 | t_page = null_lookup_page(nullb, sector, false, |
1047 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
1048 | |
1049 | dst = kmap_atomic(dest); | |
1050 | if (!t_page) { | |
1051 | memset(dst + off + count, 0, temp); | |
1052 | goto next; | |
1053 | } | |
1054 | src = kmap_atomic(t_page->page); | |
1055 | memcpy(dst + off + count, src + offset, temp); | |
1056 | kunmap_atomic(src); | |
1057 | next: | |
1058 | kunmap_atomic(dst); | |
1059 | ||
1060 | count += temp; | |
1061 | sector += temp >> SECTOR_SHIFT; | |
1062 | } | |
1063 | return 0; | |
1064 | } | |
1065 | ||
306eb6b4 SL |
1066 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
1067 | { | |
1068 | size_t temp; | |
1069 | ||
1070 | spin_lock_irq(&nullb->lock); | |
1071 | while (n > 0) { | |
1072 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1073 | null_free_sector(nullb, sector, false); |
1074 | if (null_cache_active(nullb)) | |
1075 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1076 | sector += temp >> SECTOR_SHIFT; |
1077 | n -= temp; | |
1078 | } | |
1079 | spin_unlock_irq(&nullb->lock); | |
1080 | } | |
1081 | ||
deb78b41 SL |
1082 | static int null_handle_flush(struct nullb *nullb) |
1083 | { | |
1084 | int err; | |
1085 | ||
1086 | if (!null_cache_active(nullb)) | |
1087 | return 0; | |
1088 | ||
1089 | spin_lock_irq(&nullb->lock); | |
1090 | while (true) { | |
1091 | err = null_make_cache_space(nullb, | |
1092 | nullb->dev->cache_size * 1024 * 1024); | |
1093 | if (err || nullb->dev->curr_cache == 0) | |
1094 | break; | |
1095 | } | |
1096 | ||
1097 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1098 | spin_unlock_irq(&nullb->lock); | |
1099 | return err; | |
1100 | } | |
1101 | ||
5bcd0e0c | 1102 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1103 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1104 | bool is_fua) | |
f2298c04 | 1105 | { |
5bcd0e0c SL |
1106 | int err = 0; |
1107 | ||
1108 | if (!is_write) { | |
1109 | err = copy_from_nullb(nullb, page, off, sector, len); | |
1110 | flush_dcache_page(page); | |
1111 | } else { | |
1112 | flush_dcache_page(page); | |
deb78b41 | 1113 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1114 | } |
1115 | ||
1116 | return err; | |
1117 | } | |
1118 | ||
1119 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1120 | { | |
1121 | struct request *rq = cmd->rq; | |
1122 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1123 | int err; | |
1124 | unsigned int len; | |
1125 | sector_t sector; | |
1126 | struct req_iterator iter; | |
1127 | struct bio_vec bvec; | |
1128 | ||
1129 | sector = blk_rq_pos(rq); | |
1130 | ||
306eb6b4 SL |
1131 | if (req_op(rq) == REQ_OP_DISCARD) { |
1132 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1133 | return 0; | |
1134 | } | |
1135 | ||
5bcd0e0c SL |
1136 | spin_lock_irq(&nullb->lock); |
1137 | rq_for_each_segment(bvec, rq, iter) { | |
1138 | len = bvec.bv_len; | |
1139 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1140 | op_is_write(req_op(rq)), sector, |
1141 | req_op(rq) & REQ_FUA); | |
5bcd0e0c SL |
1142 | if (err) { |
1143 | spin_unlock_irq(&nullb->lock); | |
1144 | return err; | |
1145 | } | |
1146 | sector += len >> SECTOR_SHIFT; | |
1147 | } | |
1148 | spin_unlock_irq(&nullb->lock); | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1154 | { | |
1155 | struct bio *bio = cmd->bio; | |
1156 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1157 | int err; | |
1158 | unsigned int len; | |
1159 | sector_t sector; | |
1160 | struct bio_vec bvec; | |
1161 | struct bvec_iter iter; | |
1162 | ||
1163 | sector = bio->bi_iter.bi_sector; | |
1164 | ||
306eb6b4 SL |
1165 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1166 | null_handle_discard(nullb, sector, | |
1167 | bio_sectors(bio) << SECTOR_SHIFT); | |
1168 | return 0; | |
1169 | } | |
1170 | ||
5bcd0e0c SL |
1171 | spin_lock_irq(&nullb->lock); |
1172 | bio_for_each_segment(bvec, bio, iter) { | |
1173 | len = bvec.bv_len; | |
1174 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 SL |
1175 | op_is_write(bio_op(bio)), sector, |
1176 | bio_op(bio) & REQ_FUA); | |
5bcd0e0c SL |
1177 | if (err) { |
1178 | spin_unlock_irq(&nullb->lock); | |
1179 | return err; | |
1180 | } | |
1181 | sector += len >> SECTOR_SHIFT; | |
1182 | } | |
1183 | spin_unlock_irq(&nullb->lock); | |
1184 | return 0; | |
1185 | } | |
1186 | ||
eff2c4f1 SL |
1187 | static void null_stop_queue(struct nullb *nullb) |
1188 | { | |
1189 | struct request_queue *q = nullb->q; | |
1190 | ||
1191 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1192 | blk_mq_stop_hw_queues(q); | |
1193 | else { | |
1194 | spin_lock_irq(q->queue_lock); | |
1195 | blk_stop_queue(q); | |
1196 | spin_unlock_irq(q->queue_lock); | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | static void null_restart_queue_async(struct nullb *nullb) | |
1201 | { | |
1202 | struct request_queue *q = nullb->q; | |
1203 | unsigned long flags; | |
1204 | ||
1205 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1206 | blk_mq_start_stopped_hw_queues(q, true); | |
1207 | else { | |
1208 | spin_lock_irqsave(q->queue_lock, flags); | |
1209 | blk_start_queue_async(q); | |
1210 | spin_unlock_irqrestore(q->queue_lock, flags); | |
1211 | } | |
1212 | } | |
1213 | ||
5bcd0e0c SL |
1214 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd) |
1215 | { | |
1216 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1217 | struct nullb *nullb = dev->nullb; |
5bcd0e0c SL |
1218 | int err = 0; |
1219 | ||
eff2c4f1 SL |
1220 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
1221 | struct request *rq = cmd->rq; | |
1222 | ||
1223 | if (!hrtimer_active(&nullb->bw_timer)) | |
1224 | hrtimer_restart(&nullb->bw_timer); | |
1225 | ||
1226 | if (atomic_long_sub_return(blk_rq_bytes(rq), | |
1227 | &nullb->cur_bytes) < 0) { | |
1228 | null_stop_queue(nullb); | |
1229 | /* race with timer */ | |
1230 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1231 | null_restart_queue_async(nullb); | |
1232 | if (dev->queue_mode == NULL_Q_RQ) { | |
1233 | struct request_queue *q = nullb->q; | |
1234 | ||
1235 | spin_lock_irq(q->queue_lock); | |
1236 | rq->rq_flags |= RQF_DONTPREP; | |
1237 | blk_requeue_request(q, rq); | |
1238 | spin_unlock_irq(q->queue_lock); | |
1239 | return BLK_STS_OK; | |
1240 | } else | |
1241 | /* requeue request */ | |
1242 | return BLK_STS_RESOURCE; | |
1243 | } | |
1244 | } | |
1245 | ||
2f54a613 SL |
1246 | if (nullb->dev->badblocks.shift != -1) { |
1247 | int bad_sectors; | |
1248 | sector_t sector, size, first_bad; | |
1249 | bool is_flush = true; | |
1250 | ||
1251 | if (dev->queue_mode == NULL_Q_BIO && | |
1252 | bio_op(cmd->bio) != REQ_OP_FLUSH) { | |
1253 | is_flush = false; | |
1254 | sector = cmd->bio->bi_iter.bi_sector; | |
1255 | size = bio_sectors(cmd->bio); | |
1256 | } | |
1257 | if (dev->queue_mode != NULL_Q_BIO && | |
1258 | req_op(cmd->rq) != REQ_OP_FLUSH) { | |
1259 | is_flush = false; | |
1260 | sector = blk_rq_pos(cmd->rq); | |
1261 | size = blk_rq_sectors(cmd->rq); | |
1262 | } | |
1263 | if (!is_flush && badblocks_check(&nullb->dev->badblocks, sector, | |
1264 | size, &first_bad, &bad_sectors)) { | |
1265 | cmd->error = BLK_STS_IOERR; | |
1266 | goto out; | |
1267 | } | |
1268 | } | |
1269 | ||
5bcd0e0c | 1270 | if (dev->memory_backed) { |
deb78b41 SL |
1271 | if (dev->queue_mode == NULL_Q_BIO) { |
1272 | if (bio_op(cmd->bio) == REQ_OP_FLUSH) | |
1273 | err = null_handle_flush(nullb); | |
1274 | else | |
1275 | err = null_handle_bio(cmd); | |
1276 | } else { | |
1277 | if (req_op(cmd->rq) == REQ_OP_FLUSH) | |
1278 | err = null_handle_flush(nullb); | |
1279 | else | |
1280 | err = null_handle_rq(cmd); | |
1281 | } | |
5bcd0e0c SL |
1282 | } |
1283 | cmd->error = errno_to_blk_status(err); | |
2f54a613 | 1284 | out: |
f2298c04 | 1285 | /* Complete IO by inline, softirq or timer */ |
5bcd0e0c | 1286 | switch (dev->irqmode) { |
f2298c04 | 1287 | case NULL_IRQ_SOFTIRQ: |
5bcd0e0c | 1288 | switch (dev->queue_mode) { |
ce2c350b | 1289 | case NULL_Q_MQ: |
08e0029a | 1290 | blk_mq_complete_request(cmd->rq); |
ce2c350b CH |
1291 | break; |
1292 | case NULL_Q_RQ: | |
1293 | blk_complete_request(cmd->rq); | |
1294 | break; | |
1295 | case NULL_Q_BIO: | |
1296 | /* | |
1297 | * XXX: no proper submitting cpu information available. | |
1298 | */ | |
1299 | end_cmd(cmd); | |
1300 | break; | |
1301 | } | |
1302 | break; | |
1303 | case NULL_IRQ_NONE: | |
f2298c04 | 1304 | end_cmd(cmd); |
f2298c04 JA |
1305 | break; |
1306 | case NULL_IRQ_TIMER: | |
1307 | null_cmd_end_timer(cmd); | |
1308 | break; | |
1309 | } | |
5bcd0e0c | 1310 | return BLK_STS_OK; |
f2298c04 JA |
1311 | } |
1312 | ||
eff2c4f1 SL |
1313 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1314 | { | |
1315 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1316 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1317 | unsigned int mbps = nullb->dev->mbps; | |
1318 | ||
1319 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1320 | return HRTIMER_NORESTART; | |
1321 | ||
1322 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1323 | null_restart_queue_async(nullb); | |
1324 | ||
1325 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1326 | ||
1327 | return HRTIMER_RESTART; | |
1328 | } | |
1329 | ||
1330 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1331 | { | |
1332 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1333 | ||
1334 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1335 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1336 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1337 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1338 | } |
1339 | ||
1340 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1341 | { | |
1342 | int index = 0; | |
1343 | ||
1344 | if (nullb->nr_queues != 1) | |
1345 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1346 | ||
1347 | return &nullb->queues[index]; | |
1348 | } | |
1349 | ||
dece1635 | 1350 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
1351 | { |
1352 | struct nullb *nullb = q->queuedata; | |
1353 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1354 | struct nullb_cmd *cmd; | |
1355 | ||
1356 | cmd = alloc_cmd(nq, 1); | |
1357 | cmd->bio = bio; | |
1358 | ||
1359 | null_handle_cmd(cmd); | |
dece1635 | 1360 | return BLK_QC_T_NONE; |
f2298c04 JA |
1361 | } |
1362 | ||
1363 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) | |
1364 | { | |
1365 | struct nullb *nullb = q->queuedata; | |
1366 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
1367 | struct nullb_cmd *cmd; | |
1368 | ||
1369 | cmd = alloc_cmd(nq, 0); | |
1370 | if (cmd) { | |
1371 | cmd->rq = req; | |
1372 | req->special = cmd; | |
1373 | return BLKPREP_OK; | |
1374 | } | |
8b70f45e | 1375 | blk_stop_queue(q); |
f2298c04 JA |
1376 | |
1377 | return BLKPREP_DEFER; | |
1378 | } | |
1379 | ||
1380 | static void null_request_fn(struct request_queue *q) | |
1381 | { | |
1382 | struct request *rq; | |
1383 | ||
1384 | while ((rq = blk_fetch_request(q)) != NULL) { | |
1385 | struct nullb_cmd *cmd = rq->special; | |
1386 | ||
1387 | spin_unlock_irq(q->queue_lock); | |
1388 | null_handle_cmd(cmd); | |
1389 | spin_lock_irq(q->queue_lock); | |
1390 | } | |
1391 | } | |
1392 | ||
fc17b653 | 1393 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1394 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1395 | { |
74c45052 | 1396 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1397 | struct nullb_queue *nq = hctx->driver_data; |
f2298c04 | 1398 | |
db5bcf87 JA |
1399 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1400 | ||
2984c868 | 1401 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1402 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1403 | cmd->timer.function = null_cmd_timer_expired; | |
1404 | } | |
74c45052 | 1405 | cmd->rq = bd->rq; |
2984c868 | 1406 | cmd->nq = nq; |
f2298c04 | 1407 | |
74c45052 | 1408 | blk_mq_start_request(bd->rq); |
e2490073 | 1409 | |
5bcd0e0c | 1410 | return null_handle_cmd(cmd); |
f2298c04 JA |
1411 | } |
1412 | ||
f363b089 | 1413 | static const struct blk_mq_ops null_mq_ops = { |
f2298c04 | 1414 | .queue_rq = null_queue_rq, |
ce2c350b | 1415 | .complete = null_softirq_done_fn, |
f2298c04 JA |
1416 | }; |
1417 | ||
de65d2d2 MB |
1418 | static void cleanup_queue(struct nullb_queue *nq) |
1419 | { | |
1420 | kfree(nq->tag_map); | |
1421 | kfree(nq->cmds); | |
1422 | } | |
1423 | ||
1424 | static void cleanup_queues(struct nullb *nullb) | |
1425 | { | |
1426 | int i; | |
1427 | ||
1428 | for (i = 0; i < nullb->nr_queues; i++) | |
1429 | cleanup_queue(&nullb->queues[i]); | |
1430 | ||
1431 | kfree(nullb->queues); | |
1432 | } | |
1433 | ||
b2b7e001 MB |
1434 | #ifdef CONFIG_NVM |
1435 | ||
2a842aca | 1436 | static void null_lnvm_end_io(struct request *rq, blk_status_t status) |
b2b7e001 MB |
1437 | { |
1438 | struct nvm_rq *rqd = rq->end_io_data; | |
b2b7e001 | 1439 | |
2a842aca CH |
1440 | /* XXX: lighnvm core seems to expect NVM_RSP_* values here.. */ |
1441 | rqd->error = status ? -EIO : 0; | |
06894efe | 1442 | nvm_end_io(rqd); |
b2b7e001 MB |
1443 | |
1444 | blk_put_request(rq); | |
1445 | } | |
1446 | ||
16f26c3a | 1447 | static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) |
b2b7e001 | 1448 | { |
16f26c3a | 1449 | struct request_queue *q = dev->q; |
b2b7e001 MB |
1450 | struct request *rq; |
1451 | struct bio *bio = rqd->bio; | |
1452 | ||
aebf526b CH |
1453 | rq = blk_mq_alloc_request(q, |
1454 | op_is_write(bio_op(bio)) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); | |
b2b7e001 MB |
1455 | if (IS_ERR(rq)) |
1456 | return -ENOMEM; | |
1457 | ||
2644a3cc | 1458 | blk_init_request_from_bio(rq, bio); |
b2b7e001 MB |
1459 | |
1460 | rq->end_io_data = rqd; | |
1461 | ||
1462 | blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); | |
1463 | ||
1464 | return 0; | |
1465 | } | |
1466 | ||
16f26c3a | 1467 | static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id) |
b2b7e001 | 1468 | { |
2984c868 SL |
1469 | struct nullb *nullb = dev->q->queuedata; |
1470 | sector_t size = (sector_t)nullb->dev->size * 1024 * 1024ULL; | |
5b40db99 | 1471 | sector_t blksize; |
b2b7e001 MB |
1472 | struct nvm_id_group *grp; |
1473 | ||
1474 | id->ver_id = 0x1; | |
1475 | id->vmnt = 0; | |
bf643185 | 1476 | id->cap = 0x2; |
b2b7e001 | 1477 | id->dom = 0x1; |
5b40db99 MB |
1478 | |
1479 | id->ppaf.blk_offset = 0; | |
1480 | id->ppaf.blk_len = 16; | |
1481 | id->ppaf.pg_offset = 16; | |
1482 | id->ppaf.pg_len = 16; | |
1483 | id->ppaf.sect_offset = 32; | |
1484 | id->ppaf.sect_len = 8; | |
1485 | id->ppaf.pln_offset = 40; | |
1486 | id->ppaf.pln_len = 8; | |
1487 | id->ppaf.lun_offset = 48; | |
1488 | id->ppaf.lun_len = 8; | |
1489 | id->ppaf.ch_offset = 56; | |
1490 | id->ppaf.ch_len = 8; | |
b2b7e001 | 1491 | |
2984c868 | 1492 | sector_div(size, nullb->dev->blocksize); /* convert size to pages */ |
e93d12ae | 1493 | size >>= 8; /* concert size to pgs pr blk */ |
19bd6fe7 | 1494 | grp = &id->grp; |
b2b7e001 | 1495 | grp->mtype = 0; |
5b40db99 | 1496 | grp->fmtype = 0; |
b2b7e001 | 1497 | grp->num_ch = 1; |
b2b7e001 | 1498 | grp->num_pg = 256; |
5b40db99 | 1499 | blksize = size; |
e93d12ae | 1500 | size >>= 16; |
5b40db99 | 1501 | grp->num_lun = size + 1; |
e93d12ae | 1502 | sector_div(blksize, grp->num_lun); |
5b40db99 MB |
1503 | grp->num_blk = blksize; |
1504 | grp->num_pln = 1; | |
1505 | ||
2984c868 SL |
1506 | grp->fpg_sz = nullb->dev->blocksize; |
1507 | grp->csecs = nullb->dev->blocksize; | |
b2b7e001 MB |
1508 | grp->trdt = 25000; |
1509 | grp->trdm = 25000; | |
1510 | grp->tprt = 500000; | |
1511 | grp->tprm = 500000; | |
1512 | grp->tbet = 1500000; | |
1513 | grp->tbem = 1500000; | |
1514 | grp->mpos = 0x010101; /* single plane rwe */ | |
2984c868 | 1515 | grp->cpar = nullb->dev->hw_queue_depth; |
b2b7e001 MB |
1516 | |
1517 | return 0; | |
1518 | } | |
1519 | ||
16f26c3a | 1520 | static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name) |
b2b7e001 MB |
1521 | { |
1522 | mempool_t *virtmem_pool; | |
1523 | ||
6bb9535b | 1524 | virtmem_pool = mempool_create_slab_pool(64, ppa_cache); |
b2b7e001 MB |
1525 | if (!virtmem_pool) { |
1526 | pr_err("null_blk: Unable to create virtual memory pool\n"); | |
1527 | return NULL; | |
1528 | } | |
1529 | ||
1530 | return virtmem_pool; | |
1531 | } | |
1532 | ||
1533 | static void null_lnvm_destroy_dma_pool(void *pool) | |
1534 | { | |
1535 | mempool_destroy(pool); | |
1536 | } | |
1537 | ||
16f26c3a | 1538 | static void *null_lnvm_dev_dma_alloc(struct nvm_dev *dev, void *pool, |
b2b7e001 MB |
1539 | gfp_t mem_flags, dma_addr_t *dma_handler) |
1540 | { | |
1541 | return mempool_alloc(pool, mem_flags); | |
1542 | } | |
1543 | ||
1544 | static void null_lnvm_dev_dma_free(void *pool, void *entry, | |
1545 | dma_addr_t dma_handler) | |
1546 | { | |
1547 | mempool_free(entry, pool); | |
1548 | } | |
1549 | ||
1550 | static struct nvm_dev_ops null_lnvm_dev_ops = { | |
1551 | .identity = null_lnvm_id, | |
1552 | .submit_io = null_lnvm_submit_io, | |
1553 | ||
1554 | .create_dma_pool = null_lnvm_create_dma_pool, | |
1555 | .destroy_dma_pool = null_lnvm_destroy_dma_pool, | |
1556 | .dev_dma_alloc = null_lnvm_dev_dma_alloc, | |
1557 | .dev_dma_free = null_lnvm_dev_dma_free, | |
1558 | ||
1559 | /* Simulate nvme protocol restriction */ | |
1560 | .max_phys_sect = 64, | |
1561 | }; | |
9ae2d0aa MB |
1562 | |
1563 | static int null_nvm_register(struct nullb *nullb) | |
1564 | { | |
b0b4e09c MB |
1565 | struct nvm_dev *dev; |
1566 | int rv; | |
1567 | ||
1568 | dev = nvm_alloc_dev(0); | |
1569 | if (!dev) | |
1570 | return -ENOMEM; | |
1571 | ||
1572 | dev->q = nullb->q; | |
1573 | memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); | |
1574 | dev->ops = &null_lnvm_dev_ops; | |
1575 | ||
1576 | rv = nvm_register(dev); | |
1577 | if (rv) { | |
1578 | kfree(dev); | |
1579 | return rv; | |
1580 | } | |
1581 | nullb->ndev = dev; | |
1582 | return 0; | |
9ae2d0aa MB |
1583 | } |
1584 | ||
1585 | static void null_nvm_unregister(struct nullb *nullb) | |
1586 | { | |
b0b4e09c | 1587 | nvm_unregister(nullb->ndev); |
9ae2d0aa | 1588 | } |
b2b7e001 | 1589 | #else |
9ae2d0aa MB |
1590 | static int null_nvm_register(struct nullb *nullb) |
1591 | { | |
92153d30 | 1592 | pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n"); |
9ae2d0aa MB |
1593 | return -EINVAL; |
1594 | } | |
1595 | static void null_nvm_unregister(struct nullb *nullb) {} | |
b2b7e001 MB |
1596 | #endif /* CONFIG_NVM */ |
1597 | ||
9ae2d0aa MB |
1598 | static void null_del_dev(struct nullb *nullb) |
1599 | { | |
2984c868 SL |
1600 | struct nullb_device *dev = nullb->dev; |
1601 | ||
94bc02e3 SL |
1602 | ida_simple_remove(&nullb_indexes, nullb->index); |
1603 | ||
9ae2d0aa MB |
1604 | list_del_init(&nullb->list); |
1605 | ||
2984c868 | 1606 | if (dev->use_lightnvm) |
9ae2d0aa MB |
1607 | null_nvm_unregister(nullb); |
1608 | else | |
1609 | del_gendisk(nullb->disk); | |
eff2c4f1 SL |
1610 | |
1611 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1612 | hrtimer_cancel(&nullb->bw_timer); | |
1613 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1614 | null_restart_queue_async(nullb); | |
1615 | } | |
1616 | ||
9ae2d0aa | 1617 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1618 | if (dev->queue_mode == NULL_Q_MQ && |
1619 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1620 | blk_mq_free_tag_set(nullb->tag_set); |
2984c868 | 1621 | if (!dev->use_lightnvm) |
9ae2d0aa MB |
1622 | put_disk(nullb->disk); |
1623 | cleanup_queues(nullb); | |
deb78b41 SL |
1624 | if (null_cache_active(nullb)) |
1625 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1626 | kfree(nullb); |
2984c868 | 1627 | dev->nullb = NULL; |
9ae2d0aa MB |
1628 | } |
1629 | ||
306eb6b4 SL |
1630 | static void null_config_discard(struct nullb *nullb) |
1631 | { | |
1632 | if (nullb->dev->discard == false) | |
1633 | return; | |
1634 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; | |
1635 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1636 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
1637 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nullb->q); | |
9ae2d0aa MB |
1638 | } |
1639 | ||
f2298c04 JA |
1640 | static int null_open(struct block_device *bdev, fmode_t mode) |
1641 | { | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | static void null_release(struct gendisk *disk, fmode_t mode) | |
1646 | { | |
1647 | } | |
1648 | ||
1649 | static const struct block_device_operations null_fops = { | |
1650 | .owner = THIS_MODULE, | |
1651 | .open = null_open, | |
1652 | .release = null_release, | |
1653 | }; | |
1654 | ||
82f402fe JA |
1655 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
1656 | { | |
1657 | BUG_ON(!nullb); | |
1658 | BUG_ON(!nq); | |
1659 | ||
1660 | init_waitqueue_head(&nq->wait); | |
1661 | nq->queue_depth = nullb->queue_depth; | |
2984c868 | 1662 | nq->dev = nullb->dev; |
82f402fe JA |
1663 | } |
1664 | ||
1665 | static void null_init_queues(struct nullb *nullb) | |
1666 | { | |
1667 | struct request_queue *q = nullb->q; | |
1668 | struct blk_mq_hw_ctx *hctx; | |
1669 | struct nullb_queue *nq; | |
1670 | int i; | |
1671 | ||
1672 | queue_for_each_hw_ctx(q, hctx, i) { | |
1673 | if (!hctx->nr_ctx || !hctx->tags) | |
1674 | continue; | |
1675 | nq = &nullb->queues[i]; | |
1676 | hctx->driver_data = nq; | |
1677 | null_init_queue(nullb, nq); | |
1678 | nullb->nr_queues++; | |
1679 | } | |
1680 | } | |
1681 | ||
f2298c04 JA |
1682 | static int setup_commands(struct nullb_queue *nq) |
1683 | { | |
1684 | struct nullb_cmd *cmd; | |
1685 | int i, tag_size; | |
1686 | ||
1687 | nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL); | |
1688 | if (!nq->cmds) | |
2d263a78 | 1689 | return -ENOMEM; |
f2298c04 JA |
1690 | |
1691 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
1692 | nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL); | |
1693 | if (!nq->tag_map) { | |
1694 | kfree(nq->cmds); | |
2d263a78 | 1695 | return -ENOMEM; |
f2298c04 JA |
1696 | } |
1697 | ||
1698 | for (i = 0; i < nq->queue_depth; i++) { | |
1699 | cmd = &nq->cmds[i]; | |
1700 | INIT_LIST_HEAD(&cmd->list); | |
1701 | cmd->ll_list.next = NULL; | |
1702 | cmd->tag = -1U; | |
1703 | } | |
1704 | ||
1705 | return 0; | |
1706 | } | |
1707 | ||
f2298c04 JA |
1708 | static int setup_queues(struct nullb *nullb) |
1709 | { | |
2984c868 SL |
1710 | nullb->queues = kzalloc(nullb->dev->submit_queues * |
1711 | sizeof(struct nullb_queue), GFP_KERNEL); | |
f2298c04 | 1712 | if (!nullb->queues) |
2d263a78 | 1713 | return -ENOMEM; |
f2298c04 JA |
1714 | |
1715 | nullb->nr_queues = 0; | |
2984c868 | 1716 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1717 | |
2d263a78 MB |
1718 | return 0; |
1719 | } | |
1720 | ||
1721 | static int init_driver_queues(struct nullb *nullb) | |
1722 | { | |
1723 | struct nullb_queue *nq; | |
1724 | int i, ret = 0; | |
f2298c04 | 1725 | |
2984c868 | 1726 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1727 | nq = &nullb->queues[i]; |
2d263a78 MB |
1728 | |
1729 | null_init_queue(nullb, nq); | |
1730 | ||
1731 | ret = setup_commands(nq); | |
1732 | if (ret) | |
31f9690e | 1733 | return ret; |
f2298c04 JA |
1734 | nullb->nr_queues++; |
1735 | } | |
2d263a78 | 1736 | return 0; |
f2298c04 JA |
1737 | } |
1738 | ||
9ae2d0aa | 1739 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
1740 | { |
1741 | struct gendisk *disk; | |
f2298c04 | 1742 | sector_t size; |
9ae2d0aa | 1743 | |
2984c868 | 1744 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1745 | if (!disk) |
1746 | return -ENOMEM; | |
2984c868 | 1747 | size = (sector_t)nullb->dev->size * 1024 * 1024ULL; |
9ae2d0aa MB |
1748 | set_capacity(disk, size >> 9); |
1749 | ||
1750 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1751 | disk->major = null_major; | |
1752 | disk->first_minor = nullb->index; | |
1753 | disk->fops = &null_fops; | |
1754 | disk->private_data = nullb; | |
1755 | disk->queue = nullb->q; | |
1756 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1757 | ||
1758 | add_disk(disk); | |
1759 | return 0; | |
1760 | } | |
1761 | ||
2984c868 | 1762 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1763 | { |
1764 | set->ops = &null_mq_ops; | |
2984c868 SL |
1765 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1766 | g_submit_queues; | |
1767 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1768 | g_hw_queue_depth; | |
1769 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1770 | set->cmd_size = sizeof(struct nullb_cmd); |
1771 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1772 | if (g_no_sched) |
1773 | set->flags |= BLK_MQ_F_NO_SCHED; | |
82f402fe JA |
1774 | set->driver_data = NULL; |
1775 | ||
0d06a42f | 1776 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1777 | set->flags |= BLK_MQ_F_BLOCKING; |
1778 | ||
1779 | return blk_mq_alloc_tag_set(set); | |
1780 | } | |
1781 | ||
cedcafad SL |
1782 | static void null_validate_conf(struct nullb_device *dev) |
1783 | { | |
1784 | dev->blocksize = round_down(dev->blocksize, 512); | |
1785 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
1786 | if (dev->use_lightnvm && dev->blocksize != 4096) | |
1787 | dev->blocksize = 4096; | |
1788 | ||
1789 | if (dev->use_lightnvm && dev->queue_mode != NULL_Q_MQ) | |
1790 | dev->queue_mode = NULL_Q_MQ; | |
1791 | ||
1792 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1793 | if (dev->submit_queues != nr_online_nodes) | |
1794 | dev->submit_queues = nr_online_nodes; | |
1795 | } else if (dev->submit_queues > nr_cpu_ids) | |
1796 | dev->submit_queues = nr_cpu_ids; | |
1797 | else if (dev->submit_queues == 0) | |
1798 | dev->submit_queues = 1; | |
1799 | ||
1800 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1801 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1802 | |
1803 | /* Do memory allocation, so set blocking */ | |
1804 | if (dev->memory_backed) | |
1805 | dev->blocking = true; | |
deb78b41 SL |
1806 | else /* cache is meaningless */ |
1807 | dev->cache_size = 0; | |
1808 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1809 | dev->cache_size); | |
eff2c4f1 SL |
1810 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1811 | /* can not stop a queue */ | |
1812 | if (dev->queue_mode == NULL_Q_BIO) | |
1813 | dev->mbps = 0; | |
cedcafad SL |
1814 | } |
1815 | ||
2984c868 | 1816 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1817 | { |
1818 | struct nullb *nullb; | |
dc501dc0 | 1819 | int rv; |
f2298c04 | 1820 | |
cedcafad SL |
1821 | null_validate_conf(dev); |
1822 | ||
2984c868 | 1823 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1824 | if (!nullb) { |
1825 | rv = -ENOMEM; | |
24d2f903 | 1826 | goto out; |
dc501dc0 | 1827 | } |
2984c868 SL |
1828 | nullb->dev = dev; |
1829 | dev->nullb = nullb; | |
f2298c04 JA |
1830 | |
1831 | spin_lock_init(&nullb->lock); | |
1832 | ||
dc501dc0 RE |
1833 | rv = setup_queues(nullb); |
1834 | if (rv) | |
24d2f903 | 1835 | goto out_free_nullb; |
f2298c04 | 1836 | |
2984c868 | 1837 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1838 | if (shared_tags) { |
1839 | nullb->tag_set = &tag_set; | |
1840 | rv = 0; | |
1841 | } else { | |
1842 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1843 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1844 | } |
1845 | ||
dc501dc0 | 1846 | if (rv) |
24d2f903 CH |
1847 | goto out_cleanup_queues; |
1848 | ||
82f402fe | 1849 | nullb->q = blk_mq_init_queue(nullb->tag_set); |
35b489d3 | 1850 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1851 | rv = -ENOMEM; |
24d2f903 | 1852 | goto out_cleanup_tags; |
dc501dc0 | 1853 | } |
82f402fe | 1854 | null_init_queues(nullb); |
2984c868 SL |
1855 | } else if (dev->queue_mode == NULL_Q_BIO) { |
1856 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node); | |
dc501dc0 RE |
1857 | if (!nullb->q) { |
1858 | rv = -ENOMEM; | |
24d2f903 | 1859 | goto out_cleanup_queues; |
dc501dc0 | 1860 | } |
f2298c04 | 1861 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
1862 | rv = init_driver_queues(nullb); |
1863 | if (rv) | |
1864 | goto out_cleanup_blk_queue; | |
f2298c04 | 1865 | } else { |
2984c868 SL |
1866 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, |
1867 | dev->home_node); | |
dc501dc0 RE |
1868 | if (!nullb->q) { |
1869 | rv = -ENOMEM; | |
24d2f903 | 1870 | goto out_cleanup_queues; |
dc501dc0 | 1871 | } |
f2298c04 | 1872 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 1873 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
31f9690e JK |
1874 | rv = init_driver_queues(nullb); |
1875 | if (rv) | |
1876 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1877 | } |
1878 | ||
eff2c4f1 SL |
1879 | if (dev->mbps) { |
1880 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1881 | nullb_setup_bwtimer(nullb); | |
1882 | } | |
1883 | ||
deb78b41 SL |
1884 | if (dev->cache_size > 0) { |
1885 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1886 | blk_queue_write_cache(nullb->q, true, true); | |
1887 | blk_queue_flush_queueable(nullb->q, true); | |
1888 | } | |
1889 | ||
f2298c04 JA |
1890 | nullb->q->queuedata = nullb; |
1891 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); | |
b277da0a | 1892 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
f2298c04 | 1893 | |
f2298c04 | 1894 | mutex_lock(&lock); |
94bc02e3 | 1895 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1896 | dev->index = nullb->index; |
f2298c04 JA |
1897 | mutex_unlock(&lock); |
1898 | ||
2984c868 SL |
1899 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1900 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1901 | |
306eb6b4 | 1902 | null_config_discard(nullb); |
f2298c04 | 1903 | |
b2b7e001 MB |
1904 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1905 | ||
2984c868 | 1906 | if (dev->use_lightnvm) |
9ae2d0aa MB |
1907 | rv = null_nvm_register(nullb); |
1908 | else | |
1909 | rv = null_gendisk_register(nullb); | |
b2b7e001 | 1910 | |
9ae2d0aa MB |
1911 | if (rv) |
1912 | goto out_cleanup_blk_queue; | |
a514379b MB |
1913 | |
1914 | mutex_lock(&lock); | |
1915 | list_add_tail(&nullb->list, &nullb_list); | |
1916 | mutex_unlock(&lock); | |
3681c85d | 1917 | |
f2298c04 | 1918 | return 0; |
24d2f903 CH |
1919 | out_cleanup_blk_queue: |
1920 | blk_cleanup_queue(nullb->q); | |
1921 | out_cleanup_tags: | |
2984c868 | 1922 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1923 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1924 | out_cleanup_queues: |
1925 | cleanup_queues(nullb); | |
1926 | out_free_nullb: | |
1927 | kfree(nullb); | |
1928 | out: | |
dc501dc0 | 1929 | return rv; |
f2298c04 JA |
1930 | } |
1931 | ||
1932 | static int __init null_init(void) | |
1933 | { | |
af096e22 | 1934 | int ret = 0; |
f2298c04 | 1935 | unsigned int i; |
af096e22 | 1936 | struct nullb *nullb; |
2984c868 | 1937 | struct nullb_device *dev; |
f2298c04 | 1938 | |
2984c868 | 1939 | if (g_bs > PAGE_SIZE) { |
9967d8ac R |
1940 | pr_warn("null_blk: invalid block size\n"); |
1941 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1942 | g_bs = PAGE_SIZE; |
9967d8ac | 1943 | } |
f2298c04 | 1944 | |
2984c868 | 1945 | if (g_use_lightnvm && g_bs != 4096) { |
6bb9535b MB |
1946 | pr_warn("null_blk: LightNVM only supports 4k block size\n"); |
1947 | pr_warn("null_blk: defaults block size to 4k\n"); | |
2984c868 | 1948 | g_bs = 4096; |
6bb9535b MB |
1949 | } |
1950 | ||
2984c868 | 1951 | if (g_use_lightnvm && g_queue_mode != NULL_Q_MQ) { |
b2b7e001 MB |
1952 | pr_warn("null_blk: LightNVM only supported for blk-mq\n"); |
1953 | pr_warn("null_blk: defaults queue mode to blk-mq\n"); | |
2984c868 | 1954 | g_queue_mode = NULL_Q_MQ; |
b2b7e001 MB |
1955 | } |
1956 | ||
2984c868 SL |
1957 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1958 | if (g_submit_queues != nr_online_nodes) { | |
558ab300 | 1959 | pr_warn("null_blk: submit_queues param is set to %u.\n", |
d15ee6b1 | 1960 | nr_online_nodes); |
2984c868 | 1961 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1962 | } |
2984c868 SL |
1963 | } else if (g_submit_queues > nr_cpu_ids) |
1964 | g_submit_queues = nr_cpu_ids; | |
1965 | else if (g_submit_queues <= 0) | |
1966 | g_submit_queues = 1; | |
f2298c04 | 1967 | |
2984c868 SL |
1968 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1969 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1970 | if (ret) |
1971 | return ret; | |
1972 | } | |
1973 | ||
3bf2bd20 SL |
1974 | config_group_init(&nullb_subsys.su_group); |
1975 | mutex_init(&nullb_subsys.su_mutex); | |
1976 | ||
1977 | ret = configfs_register_subsystem(&nullb_subsys); | |
1978 | if (ret) | |
1979 | goto err_tagset; | |
1980 | ||
f2298c04 JA |
1981 | mutex_init(&lock); |
1982 | ||
f2298c04 | 1983 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1984 | if (null_major < 0) { |
1985 | ret = null_major; | |
3bf2bd20 | 1986 | goto err_conf; |
db2d153d | 1987 | } |
f2298c04 | 1988 | |
2984c868 | 1989 | if (g_use_lightnvm) { |
6bb9535b MB |
1990 | ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64), |
1991 | 0, 0, NULL); | |
1992 | if (!ppa_cache) { | |
1993 | pr_err("null_blk: unable to create ppa cache\n"); | |
af096e22 MH |
1994 | ret = -ENOMEM; |
1995 | goto err_ppa; | |
6bb9535b MB |
1996 | } |
1997 | } | |
1998 | ||
f2298c04 | 1999 | for (i = 0; i < nr_devices; i++) { |
2984c868 | 2000 | dev = null_alloc_dev(); |
30c516d7 WY |
2001 | if (!dev) { |
2002 | ret = -ENOMEM; | |
2984c868 | 2003 | goto err_dev; |
30c516d7 | 2004 | } |
2984c868 SL |
2005 | ret = null_add_dev(dev); |
2006 | if (ret) { | |
2007 | null_free_dev(dev); | |
af096e22 | 2008 | goto err_dev; |
2984c868 | 2009 | } |
f2298c04 JA |
2010 | } |
2011 | ||
2012 | pr_info("null: module loaded\n"); | |
2013 | return 0; | |
af096e22 MH |
2014 | |
2015 | err_dev: | |
2016 | while (!list_empty(&nullb_list)) { | |
2017 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 2018 | dev = nullb->dev; |
af096e22 | 2019 | null_del_dev(nullb); |
2984c868 | 2020 | null_free_dev(dev); |
af096e22 | 2021 | } |
6bb9535b | 2022 | kmem_cache_destroy(ppa_cache); |
af096e22 MH |
2023 | err_ppa: |
2024 | unregister_blkdev(null_major, "nullb"); | |
3bf2bd20 SL |
2025 | err_conf: |
2026 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 2027 | err_tagset: |
2984c868 | 2028 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 2029 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 2030 | return ret; |
f2298c04 JA |
2031 | } |
2032 | ||
2033 | static void __exit null_exit(void) | |
2034 | { | |
2035 | struct nullb *nullb; | |
2036 | ||
3bf2bd20 SL |
2037 | configfs_unregister_subsystem(&nullb_subsys); |
2038 | ||
f2298c04 JA |
2039 | unregister_blkdev(null_major, "nullb"); |
2040 | ||
2041 | mutex_lock(&lock); | |
2042 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
2043 | struct nullb_device *dev; |
2044 | ||
f2298c04 | 2045 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 2046 | dev = nullb->dev; |
f2298c04 | 2047 | null_del_dev(nullb); |
2984c868 | 2048 | null_free_dev(dev); |
f2298c04 JA |
2049 | } |
2050 | mutex_unlock(&lock); | |
6bb9535b | 2051 | |
2984c868 | 2052 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe JA |
2053 | blk_mq_free_tag_set(&tag_set); |
2054 | ||
6bb9535b | 2055 | kmem_cache_destroy(ppa_cache); |
f2298c04 JA |
2056 | } |
2057 | ||
2058 | module_init(null_init); | |
2059 | module_exit(null_exit); | |
2060 | ||
231b3db1 | 2061 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 2062 | MODULE_LICENSE("GPL"); |