Commit | Line | Data |
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8722ff8c | 1 | /* |
2 | * Filename: dev.c | |
3 | * | |
4 | * | |
5 | * Authors: Joshua Morris <josh.h.morris@us.ibm.com> | |
6 | * Philip Kelleher <pjk1939@linux.vnet.ibm.com> | |
7 | * | |
8 | * (C) Copyright 2013 IBM Corporation | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software Foundation, | |
22 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/pci.h> | |
29 | #include <linux/slab.h> | |
30 | ||
31 | #include <linux/hdreg.h> | |
32 | #include <linux/genhd.h> | |
33 | #include <linux/blkdev.h> | |
34 | #include <linux/bio.h> | |
35 | ||
36 | #include <linux/fs.h> | |
37 | ||
38 | #include "rsxx_priv.h" | |
39 | ||
40 | static unsigned int blkdev_minors = 64; | |
41 | module_param(blkdev_minors, uint, 0444); | |
42 | MODULE_PARM_DESC(blkdev_minors, "Number of minors(partitions)"); | |
43 | ||
44 | /* | |
45 | * For now I'm making this tweakable in case any applications hit this limit. | |
46 | * If you see a "bio too big" error in the log you will need to raise this | |
47 | * value. | |
48 | */ | |
49 | static unsigned int blkdev_max_hw_sectors = 1024; | |
50 | module_param(blkdev_max_hw_sectors, uint, 0444); | |
51 | MODULE_PARM_DESC(blkdev_max_hw_sectors, "Max hw sectors for a single BIO"); | |
52 | ||
53 | static unsigned int enable_blkdev = 1; | |
54 | module_param(enable_blkdev , uint, 0444); | |
55 | MODULE_PARM_DESC(enable_blkdev, "Enable block device interfaces"); | |
56 | ||
57 | ||
58 | struct rsxx_bio_meta { | |
59 | struct bio *bio; | |
60 | atomic_t pending_dmas; | |
61 | atomic_t error; | |
62 | unsigned long start_time; | |
63 | }; | |
64 | ||
65 | static struct kmem_cache *bio_meta_pool; | |
66 | ||
67 | /*----------------- Block Device Operations -----------------*/ | |
68 | static int rsxx_blkdev_ioctl(struct block_device *bdev, | |
69 | fmode_t mode, | |
70 | unsigned int cmd, | |
71 | unsigned long arg) | |
72 | { | |
73 | struct rsxx_cardinfo *card = bdev->bd_disk->private_data; | |
74 | ||
75 | switch (cmd) { | |
76 | case RSXX_GETREG: | |
77 | return rsxx_reg_access(card, (void __user *)arg, 1); | |
78 | case RSXX_SETREG: | |
79 | return rsxx_reg_access(card, (void __user *)arg, 0); | |
80 | } | |
81 | ||
82 | return -ENOTTY; | |
83 | } | |
84 | ||
85 | static int rsxx_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
86 | { | |
87 | struct rsxx_cardinfo *card = bdev->bd_disk->private_data; | |
88 | u64 blocks = card->size8 >> 9; | |
89 | ||
90 | /* | |
91 | * get geometry: Fake it. I haven't found any drivers that set | |
92 | * geo->start, so we won't either. | |
93 | */ | |
94 | if (card->size8) { | |
95 | geo->heads = 64; | |
96 | geo->sectors = 16; | |
97 | do_div(blocks, (geo->heads * geo->sectors)); | |
98 | geo->cylinders = blocks; | |
99 | } else { | |
100 | geo->heads = 0; | |
101 | geo->sectors = 0; | |
102 | geo->cylinders = 0; | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static const struct block_device_operations rsxx_fops = { | |
108 | .owner = THIS_MODULE, | |
109 | .getgeo = rsxx_getgeo, | |
110 | .ioctl = rsxx_blkdev_ioctl, | |
111 | }; | |
112 | ||
113 | static void disk_stats_start(struct rsxx_cardinfo *card, struct bio *bio) | |
114 | { | |
115 | struct hd_struct *part0 = &card->gendisk->part0; | |
116 | int rw = bio_data_dir(bio); | |
117 | int cpu; | |
118 | ||
119 | cpu = part_stat_lock(); | |
120 | ||
121 | part_round_stats(cpu, part0); | |
122 | part_inc_in_flight(part0, rw); | |
123 | ||
124 | part_stat_unlock(); | |
125 | } | |
126 | ||
127 | static void disk_stats_complete(struct rsxx_cardinfo *card, | |
128 | struct bio *bio, | |
129 | unsigned long start_time) | |
130 | { | |
131 | struct hd_struct *part0 = &card->gendisk->part0; | |
132 | unsigned long duration = jiffies - start_time; | |
133 | int rw = bio_data_dir(bio); | |
134 | int cpu; | |
135 | ||
136 | cpu = part_stat_lock(); | |
137 | ||
138 | part_stat_add(cpu, part0, sectors[rw], bio_sectors(bio)); | |
139 | part_stat_inc(cpu, part0, ios[rw]); | |
140 | part_stat_add(cpu, part0, ticks[rw], duration); | |
141 | ||
142 | part_round_stats(cpu, part0); | |
143 | part_dec_in_flight(part0, rw); | |
144 | ||
145 | part_stat_unlock(); | |
146 | } | |
147 | ||
148 | static void bio_dma_done_cb(struct rsxx_cardinfo *card, | |
149 | void *cb_data, | |
150 | unsigned int error) | |
151 | { | |
c206c709 | 152 | struct rsxx_bio_meta *meta = cb_data; |
8722ff8c | 153 | |
154 | if (error) | |
155 | atomic_set(&meta->error, 1); | |
156 | ||
157 | if (atomic_dec_and_test(&meta->pending_dmas)) { | |
0ab4743e PK |
158 | if (!card->eeh_state && card->gendisk) |
159 | disk_stats_complete(card, meta->bio, meta->start_time); | |
8722ff8c | 160 | |
161 | bio_endio(meta->bio, atomic_read(&meta->error) ? -EIO : 0); | |
162 | kmem_cache_free(bio_meta_pool, meta); | |
163 | } | |
164 | } | |
165 | ||
166 | static void rsxx_make_request(struct request_queue *q, struct bio *bio) | |
167 | { | |
168 | struct rsxx_cardinfo *card = q->queuedata; | |
169 | struct rsxx_bio_meta *bio_meta; | |
170 | int st = -EINVAL; | |
171 | ||
172 | might_sleep(); | |
173 | ||
66bc6003 PK |
174 | if (!card) |
175 | goto req_err; | |
176 | ||
3eb8dcaf PK |
177 | if (bio->bi_sector + (bio->bi_size >> 9) > get_capacity(card->gendisk)) |
178 | goto req_err; | |
179 | ||
8722ff8c | 180 | if (unlikely(card->halt)) { |
181 | st = -EFAULT; | |
182 | goto req_err; | |
183 | } | |
184 | ||
185 | if (unlikely(card->dma_fault)) { | |
186 | st = (-EFAULT); | |
187 | goto req_err; | |
188 | } | |
189 | ||
190 | if (bio->bi_size == 0) { | |
191 | dev_err(CARD_TO_DEV(card), "size zero BIO!\n"); | |
192 | goto req_err; | |
193 | } | |
194 | ||
195 | bio_meta = kmem_cache_alloc(bio_meta_pool, GFP_KERNEL); | |
196 | if (!bio_meta) { | |
197 | st = -ENOMEM; | |
198 | goto req_err; | |
199 | } | |
200 | ||
201 | bio_meta->bio = bio; | |
202 | atomic_set(&bio_meta->error, 0); | |
203 | atomic_set(&bio_meta->pending_dmas, 0); | |
204 | bio_meta->start_time = jiffies; | |
205 | ||
0ab4743e PK |
206 | if (!unlikely(card->halt)) |
207 | disk_stats_start(card, bio); | |
8722ff8c | 208 | |
209 | dev_dbg(CARD_TO_DEV(card), "BIO[%c]: meta: %p addr8: x%llx size: %d\n", | |
210 | bio_data_dir(bio) ? 'W' : 'R', bio_meta, | |
211 | (u64)bio->bi_sector << 9, bio->bi_size); | |
212 | ||
213 | st = rsxx_dma_queue_bio(card, bio, &bio_meta->pending_dmas, | |
214 | bio_dma_done_cb, bio_meta); | |
215 | if (st) | |
216 | goto queue_err; | |
217 | ||
218 | return; | |
219 | ||
220 | queue_err: | |
221 | kmem_cache_free(bio_meta_pool, bio_meta); | |
222 | req_err: | |
223 | bio_endio(bio, st); | |
224 | } | |
225 | ||
226 | /*----------------- Device Setup -------------------*/ | |
227 | static bool rsxx_discard_supported(struct rsxx_cardinfo *card) | |
228 | { | |
229 | unsigned char pci_rev; | |
230 | ||
231 | pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev); | |
232 | ||
233 | return (pci_rev >= RSXX_DISCARD_SUPPORT); | |
234 | } | |
235 | ||
8722ff8c | 236 | int rsxx_attach_dev(struct rsxx_cardinfo *card) |
237 | { | |
238 | mutex_lock(&card->dev_lock); | |
239 | ||
240 | /* The block device requires the stripe size from the config. */ | |
241 | if (enable_blkdev) { | |
242 | if (card->config_valid) | |
243 | set_capacity(card->gendisk, card->size8 >> 9); | |
244 | else | |
245 | set_capacity(card->gendisk, 0); | |
246 | add_disk(card->gendisk); | |
247 | ||
248 | card->bdev_attached = 1; | |
249 | } | |
250 | ||
251 | mutex_unlock(&card->dev_lock); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | void rsxx_detach_dev(struct rsxx_cardinfo *card) | |
257 | { | |
258 | mutex_lock(&card->dev_lock); | |
259 | ||
260 | if (card->bdev_attached) { | |
261 | del_gendisk(card->gendisk); | |
262 | card->bdev_attached = 0; | |
263 | } | |
264 | ||
265 | mutex_unlock(&card->dev_lock); | |
266 | } | |
267 | ||
268 | int rsxx_setup_dev(struct rsxx_cardinfo *card) | |
269 | { | |
270 | unsigned short blk_size; | |
271 | ||
272 | mutex_init(&card->dev_lock); | |
273 | ||
274 | if (!enable_blkdev) | |
275 | return 0; | |
276 | ||
277 | card->major = register_blkdev(0, DRIVER_NAME); | |
278 | if (card->major < 0) { | |
279 | dev_err(CARD_TO_DEV(card), "Failed to get major number\n"); | |
280 | return -ENOMEM; | |
281 | } | |
282 | ||
283 | card->queue = blk_alloc_queue(GFP_KERNEL); | |
284 | if (!card->queue) { | |
285 | dev_err(CARD_TO_DEV(card), "Failed queue alloc\n"); | |
286 | unregister_blkdev(card->major, DRIVER_NAME); | |
287 | return -ENOMEM; | |
288 | } | |
289 | ||
290 | card->gendisk = alloc_disk(blkdev_minors); | |
291 | if (!card->gendisk) { | |
292 | dev_err(CARD_TO_DEV(card), "Failed disk alloc\n"); | |
293 | blk_cleanup_queue(card->queue); | |
294 | unregister_blkdev(card->major, DRIVER_NAME); | |
295 | return -ENOMEM; | |
296 | } | |
297 | ||
7b379cc3 | 298 | blk_size = card->config.data.block_size; |
8722ff8c | 299 | |
300 | blk_queue_make_request(card->queue, rsxx_make_request); | |
301 | blk_queue_bounce_limit(card->queue, BLK_BOUNCE_ANY); | |
302 | blk_queue_dma_alignment(card->queue, blk_size - 1); | |
303 | blk_queue_max_hw_sectors(card->queue, blkdev_max_hw_sectors); | |
304 | blk_queue_logical_block_size(card->queue, blk_size); | |
305 | blk_queue_physical_block_size(card->queue, RSXX_HW_BLK_SIZE); | |
306 | ||
307 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, card->queue); | |
308 | if (rsxx_discard_supported(card)) { | |
309 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, card->queue); | |
310 | blk_queue_max_discard_sectors(card->queue, | |
311 | RSXX_HW_BLK_SIZE >> 9); | |
312 | card->queue->limits.discard_granularity = RSXX_HW_BLK_SIZE; | |
313 | card->queue->limits.discard_alignment = RSXX_HW_BLK_SIZE; | |
314 | card->queue->limits.discard_zeroes_data = 1; | |
315 | } | |
316 | ||
317 | card->queue->queuedata = card; | |
318 | ||
319 | snprintf(card->gendisk->disk_name, sizeof(card->gendisk->disk_name), | |
320 | "rsxx%d", card->disk_id); | |
321 | card->gendisk->driverfs_dev = &card->dev->dev; | |
322 | card->gendisk->major = card->major; | |
323 | card->gendisk->first_minor = 0; | |
324 | card->gendisk->fops = &rsxx_fops; | |
325 | card->gendisk->private_data = card; | |
326 | card->gendisk->queue = card->queue; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | void rsxx_destroy_dev(struct rsxx_cardinfo *card) | |
332 | { | |
333 | if (!enable_blkdev) | |
334 | return; | |
335 | ||
336 | put_disk(card->gendisk); | |
337 | card->gendisk = NULL; | |
338 | ||
339 | blk_cleanup_queue(card->queue); | |
66bc6003 | 340 | card->queue->queuedata = NULL; |
8722ff8c | 341 | unregister_blkdev(card->major, DRIVER_NAME); |
342 | } | |
343 | ||
344 | int rsxx_dev_init(void) | |
345 | { | |
346 | bio_meta_pool = KMEM_CACHE(rsxx_bio_meta, SLAB_HWCACHE_ALIGN); | |
347 | if (!bio_meta_pool) | |
348 | return -ENOMEM; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | void rsxx_dev_cleanup(void) | |
354 | { | |
355 | kmem_cache_destroy(bio_meta_pool); | |
356 | } | |
357 | ||
358 |