5 * Authors: Joshua Morris <josh.h.morris@us.ibm.com>
6 * Philip Kelleher <pjk1939@linux.vnet.ibm.com>
8 * (C) Copyright 2013 IBM Corporation
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.
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.
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
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>
31 #include <linux/hdreg.h>
32 #include <linux/genhd.h>
33 #include <linux/blkdev.h>
34 #include <linux/bio.h>
38 #include "rsxx_priv.h"
40 static unsigned int blkdev_minors = 64;
41 module_param(blkdev_minors, uint, 0444);
42 MODULE_PARM_DESC(blkdev_minors, "Number of minors(partitions)");
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
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");
53 static unsigned int enable_blkdev = 1;
54 module_param(enable_blkdev , uint, 0444);
55 MODULE_PARM_DESC(enable_blkdev, "Enable block device interfaces");
58 struct rsxx_bio_meta {
60 atomic_t pending_dmas;
62 unsigned long start_time;
65 static struct kmem_cache *bio_meta_pool;
67 /*----------------- Block Device Operations -----------------*/
68 static int rsxx_blkdev_ioctl(struct block_device *bdev,
73 struct rsxx_cardinfo *card = bdev->bd_disk->private_data;
77 return rsxx_reg_access(card, (void __user *)arg, 1);
79 return rsxx_reg_access(card, (void __user *)arg, 0);
85 static int rsxx_getgeo(struct block_device *bdev, struct hd_geometry *geo)
87 struct rsxx_cardinfo *card = bdev->bd_disk->private_data;
88 u64 blocks = card->size8 >> 9;
91 * get geometry: Fake it. I haven't found any drivers that set
92 * geo->start, so we won't either.
97 do_div(blocks, (geo->heads * geo->sectors));
98 geo->cylinders = blocks;
107 static const struct block_device_operations rsxx_fops = {
108 .owner = THIS_MODULE,
109 .getgeo = rsxx_getgeo,
110 .ioctl = rsxx_blkdev_ioctl,
113 static void disk_stats_start(struct rsxx_cardinfo *card, struct bio *bio)
115 generic_start_io_acct(bio_data_dir(bio), bio_sectors(bio),
116 &card->gendisk->part0);
119 static void disk_stats_complete(struct rsxx_cardinfo *card,
121 unsigned long start_time)
123 generic_end_io_acct(bio_data_dir(bio), &card->gendisk->part0,
127 static void bio_dma_done_cb(struct rsxx_cardinfo *card,
131 struct rsxx_bio_meta *meta = cb_data;
134 atomic_set(&meta->error, 1);
136 if (atomic_dec_and_test(&meta->pending_dmas)) {
137 if (!card->eeh_state && card->gendisk)
138 disk_stats_complete(card, meta->bio, meta->start_time);
140 bio_endio(meta->bio, atomic_read(&meta->error) ? -EIO : 0);
141 kmem_cache_free(bio_meta_pool, meta);
145 static void rsxx_make_request(struct request_queue *q, struct bio *bio)
147 struct rsxx_cardinfo *card = q->queuedata;
148 struct rsxx_bio_meta *bio_meta;
156 if (bio_end_sector(bio) > get_capacity(card->gendisk))
159 if (unlikely(card->halt)) {
164 if (unlikely(card->dma_fault)) {
169 if (bio->bi_iter.bi_size == 0) {
170 dev_err(CARD_TO_DEV(card), "size zero BIO!\n");
174 bio_meta = kmem_cache_alloc(bio_meta_pool, GFP_KERNEL);
181 atomic_set(&bio_meta->error, 0);
182 atomic_set(&bio_meta->pending_dmas, 0);
183 bio_meta->start_time = jiffies;
185 if (!unlikely(card->halt))
186 disk_stats_start(card, bio);
188 dev_dbg(CARD_TO_DEV(card), "BIO[%c]: meta: %p addr8: x%llx size: %d\n",
189 bio_data_dir(bio) ? 'W' : 'R', bio_meta,
190 (u64)bio->bi_iter.bi_sector << 9, bio->bi_iter.bi_size);
192 st = rsxx_dma_queue_bio(card, bio, &bio_meta->pending_dmas,
193 bio_dma_done_cb, bio_meta);
200 kmem_cache_free(bio_meta_pool, bio_meta);
205 /*----------------- Device Setup -------------------*/
206 static bool rsxx_discard_supported(struct rsxx_cardinfo *card)
208 unsigned char pci_rev;
210 pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
212 return (pci_rev >= RSXX_DISCARD_SUPPORT);
215 int rsxx_attach_dev(struct rsxx_cardinfo *card)
217 mutex_lock(&card->dev_lock);
219 /* The block device requires the stripe size from the config. */
221 if (card->config_valid)
222 set_capacity(card->gendisk, card->size8 >> 9);
224 set_capacity(card->gendisk, 0);
225 add_disk(card->gendisk);
227 card->bdev_attached = 1;
230 mutex_unlock(&card->dev_lock);
235 void rsxx_detach_dev(struct rsxx_cardinfo *card)
237 mutex_lock(&card->dev_lock);
239 if (card->bdev_attached) {
240 del_gendisk(card->gendisk);
241 card->bdev_attached = 0;
244 mutex_unlock(&card->dev_lock);
247 int rsxx_setup_dev(struct rsxx_cardinfo *card)
249 unsigned short blk_size;
251 mutex_init(&card->dev_lock);
256 card->major = register_blkdev(0, DRIVER_NAME);
257 if (card->major < 0) {
258 dev_err(CARD_TO_DEV(card), "Failed to get major number\n");
262 card->queue = blk_alloc_queue(GFP_KERNEL);
264 dev_err(CARD_TO_DEV(card), "Failed queue alloc\n");
265 unregister_blkdev(card->major, DRIVER_NAME);
269 card->gendisk = alloc_disk(blkdev_minors);
270 if (!card->gendisk) {
271 dev_err(CARD_TO_DEV(card), "Failed disk alloc\n");
272 blk_cleanup_queue(card->queue);
273 unregister_blkdev(card->major, DRIVER_NAME);
277 if (card->config_valid) {
278 blk_size = card->config.data.block_size;
279 blk_queue_dma_alignment(card->queue, blk_size - 1);
280 blk_queue_logical_block_size(card->queue, blk_size);
283 blk_queue_make_request(card->queue, rsxx_make_request);
284 blk_queue_bounce_limit(card->queue, BLK_BOUNCE_ANY);
285 blk_queue_max_hw_sectors(card->queue, blkdev_max_hw_sectors);
286 blk_queue_physical_block_size(card->queue, RSXX_HW_BLK_SIZE);
288 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, card->queue);
289 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, card->queue);
290 if (rsxx_discard_supported(card)) {
291 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, card->queue);
292 blk_queue_max_discard_sectors(card->queue,
293 RSXX_HW_BLK_SIZE >> 9);
294 card->queue->limits.discard_granularity = RSXX_HW_BLK_SIZE;
295 card->queue->limits.discard_alignment = RSXX_HW_BLK_SIZE;
296 card->queue->limits.discard_zeroes_data = 1;
299 card->queue->queuedata = card;
301 snprintf(card->gendisk->disk_name, sizeof(card->gendisk->disk_name),
302 "rsxx%d", card->disk_id);
303 card->gendisk->driverfs_dev = &card->dev->dev;
304 card->gendisk->major = card->major;
305 card->gendisk->first_minor = 0;
306 card->gendisk->fops = &rsxx_fops;
307 card->gendisk->private_data = card;
308 card->gendisk->queue = card->queue;
313 void rsxx_destroy_dev(struct rsxx_cardinfo *card)
318 put_disk(card->gendisk);
319 card->gendisk = NULL;
321 blk_cleanup_queue(card->queue);
322 card->queue->queuedata = NULL;
323 unregister_blkdev(card->major, DRIVER_NAME);
326 int rsxx_dev_init(void)
328 bio_meta_pool = KMEM_CACHE(rsxx_bio_meta, SLAB_HWCACHE_ALIGN);
335 void rsxx_dev_cleanup(void)
337 kmem_cache_destroy(bio_meta_pool);