diff options
Diffstat (limited to 'drivers/block/rsxx/dev.c')
| -rw-r--r-- | drivers/block/rsxx/dev.c | 340 |
1 files changed, 0 insertions, 340 deletions
diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c deleted file mode 100644 index 3894aa0f350b..000000000000 --- a/drivers/block/rsxx/dev.c +++ /dev/null @@ -1,340 +0,0 @@ -/* -* Filename: dev.c -* -* -* Authors: Joshua Morris <josh.h.morris@us.ibm.com> -* Philip Kelleher <pjk1939@linux.vnet.ibm.com> -* -* (C) Copyright 2013 IBM Corporation -* -* This program is free software; you can redistribute it and/or -* modify it under the terms of the GNU General Public License as -* published by the Free Software Foundation; either version 2 of the -* License, or (at your option) any later version. -* -* This program is distributed in the hope that it will be useful, but -* WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -* General Public License for more details. -* -* You should have received a copy of the GNU General Public License -* along with this program; if not, write to the Free Software Foundation, -* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -*/ - -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/slab.h> - -#include <linux/hdreg.h> -#include <linux/genhd.h> -#include <linux/blkdev.h> -#include <linux/bio.h> - -#include <linux/fs.h> - -#include "rsxx_priv.h" - -static unsigned int blkdev_minors = 64; -module_param(blkdev_minors, uint, 0444); -MODULE_PARM_DESC(blkdev_minors, "Number of minors(partitions)"); - -/* - * For now I'm making this tweakable in case any applications hit this limit. - * If you see a "bio too big" error in the log you will need to raise this - * value. - */ -static unsigned int blkdev_max_hw_sectors = 1024; -module_param(blkdev_max_hw_sectors, uint, 0444); -MODULE_PARM_DESC(blkdev_max_hw_sectors, "Max hw sectors for a single BIO"); - -static unsigned int enable_blkdev = 1; -module_param(enable_blkdev , uint, 0444); -MODULE_PARM_DESC(enable_blkdev, "Enable block device interfaces"); - - -struct rsxx_bio_meta { - struct bio *bio; - atomic_t pending_dmas; - atomic_t error; - unsigned long start_time; -}; - -static struct kmem_cache *bio_meta_pool; - -/*----------------- Block Device Operations -----------------*/ -static int rsxx_blkdev_ioctl(struct block_device *bdev, - fmode_t mode, - unsigned int cmd, - unsigned long arg) -{ - struct rsxx_cardinfo *card = bdev->bd_disk->private_data; - - switch (cmd) { - case RSXX_GETREG: - return rsxx_reg_access(card, (void __user *)arg, 1); - case RSXX_SETREG: - return rsxx_reg_access(card, (void __user *)arg, 0); - } - - return -ENOTTY; -} - -static int rsxx_getgeo(struct block_device *bdev, struct hd_geometry *geo) -{ - struct rsxx_cardinfo *card = bdev->bd_disk->private_data; - u64 blocks = card->size8 >> 9; - - /* - * get geometry: Fake it. I haven't found any drivers that set - * geo->start, so we won't either. - */ - if (card->size8) { - geo->heads = 64; - geo->sectors = 16; - do_div(blocks, (geo->heads * geo->sectors)); - geo->cylinders = blocks; - } else { - geo->heads = 0; - geo->sectors = 0; - geo->cylinders = 0; - } - return 0; -} - -static const struct block_device_operations rsxx_fops = { - .owner = THIS_MODULE, - .getgeo = rsxx_getgeo, - .ioctl = rsxx_blkdev_ioctl, -}; - -static void disk_stats_start(struct rsxx_cardinfo *card, struct bio *bio) -{ - generic_start_io_acct(card->queue, bio_op(bio), bio_sectors(bio), - &card->gendisk->part0); -} - -static void disk_stats_complete(struct rsxx_cardinfo *card, - struct bio *bio, - unsigned long start_time) -{ - generic_end_io_acct(card->queue, bio_op(bio), - &card->gendisk->part0, start_time); -} - -static void bio_dma_done_cb(struct rsxx_cardinfo *card, - void *cb_data, - unsigned int error) -{ - struct rsxx_bio_meta *meta = cb_data; - - if (error) - atomic_set(&meta->error, 1); - - if (atomic_dec_and_test(&meta->pending_dmas)) { - if (!card->eeh_state && card->gendisk) - disk_stats_complete(card, meta->bio, meta->start_time); - - if (atomic_read(&meta->error)) - bio_io_error(meta->bio); - else - bio_endio(meta->bio); - kmem_cache_free(bio_meta_pool, meta); - } -} - -static blk_qc_t rsxx_make_request(struct request_queue *q, struct bio *bio) -{ - struct rsxx_cardinfo *card = q->queuedata; - struct rsxx_bio_meta *bio_meta; - blk_status_t st = BLK_STS_IOERR; - - blk_queue_split(q, &bio); - - might_sleep(); - - if (!card) - goto req_err; - - if (bio_end_sector(bio) > get_capacity(card->gendisk)) - goto req_err; - - if (unlikely(card->halt)) - goto req_err; - - if (unlikely(card->dma_fault)) - goto req_err; - - if (bio->bi_iter.bi_size == 0) { - dev_err(CARD_TO_DEV(card), "size zero BIO!\n"); - goto req_err; - } - - bio_meta = kmem_cache_alloc(bio_meta_pool, GFP_KERNEL); - if (!bio_meta) { - st = BLK_STS_RESOURCE; - goto req_err; - } - - bio_meta->bio = bio; - atomic_set(&bio_meta->error, 0); - atomic_set(&bio_meta->pending_dmas, 0); - bio_meta->start_time = jiffies; - - if (!unlikely(card->halt)) - disk_stats_start(card, bio); - - dev_dbg(CARD_TO_DEV(card), "BIO[%c]: meta: %p addr8: x%llx size: %d\n", - bio_data_dir(bio) ? 'W' : 'R', bio_meta, - (u64)bio->bi_iter.bi_sector << 9, bio->bi_iter.bi_size); - - st = rsxx_dma_queue_bio(card, bio, &bio_meta->pending_dmas, - bio_dma_done_cb, bio_meta); - if (st) - goto queue_err; - - return BLK_QC_T_NONE; - -queue_err: - kmem_cache_free(bio_meta_pool, bio_meta); -req_err: - if (st) - bio->bi_status = st; - bio_endio(bio); - return BLK_QC_T_NONE; -} - -/*----------------- Device Setup -------------------*/ -static bool rsxx_discard_supported(struct rsxx_cardinfo *card) -{ - unsigned char pci_rev; - - pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev); - - return (pci_rev >= RSXX_DISCARD_SUPPORT); -} - -int rsxx_attach_dev(struct rsxx_cardinfo *card) -{ - mutex_lock(&card->dev_lock); - - /* The block device requires the stripe size from the config. */ - if (enable_blkdev) { - if (card->config_valid) - set_capacity(card->gendisk, card->size8 >> 9); - else - set_capacity(card->gendisk, 0); - device_add_disk(CARD_TO_DEV(card), card->gendisk, NULL); - card->bdev_attached = 1; - } - - mutex_unlock(&card->dev_lock); - - return 0; -} - -void rsxx_detach_dev(struct rsxx_cardinfo *card) -{ - mutex_lock(&card->dev_lock); - - if (card->bdev_attached) { - del_gendisk(card->gendisk); - card->bdev_attached = 0; - } - - mutex_unlock(&card->dev_lock); -} - -int rsxx_setup_dev(struct rsxx_cardinfo *card) -{ - unsigned short blk_size; - - mutex_init(&card->dev_lock); - - if (!enable_blkdev) - return 0; - - card->major = register_blkdev(0, DRIVER_NAME); - if (card->major < 0) { - dev_err(CARD_TO_DEV(card), "Failed to get major number\n"); - return -ENOMEM; - } - - card->queue = blk_alloc_queue(GFP_KERNEL); - if (!card->queue) { - dev_err(CARD_TO_DEV(card), "Failed queue alloc\n"); - unregister_blkdev(card->major, DRIVER_NAME); - return -ENOMEM; - } - - card->gendisk = alloc_disk(blkdev_minors); - if (!card->gendisk) { - dev_err(CARD_TO_DEV(card), "Failed disk alloc\n"); - blk_cleanup_queue(card->queue); - unregister_blkdev(card->major, DRIVER_NAME); - return -ENOMEM; - } - - if (card->config_valid) { - blk_size = card->config.data.block_size; - blk_queue_dma_alignment(card->queue, blk_size - 1); - blk_queue_logical_block_size(card->queue, blk_size); - } - - blk_queue_make_request(card->queue, rsxx_make_request); - blk_queue_max_hw_sectors(card->queue, blkdev_max_hw_sectors); - blk_queue_physical_block_size(card->queue, RSXX_HW_BLK_SIZE); - - blk_queue_flag_set(QUEUE_FLAG_NONROT, card->queue); - blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, card->queue); - if (rsxx_discard_supported(card)) { - blk_queue_flag_set(QUEUE_FLAG_DISCARD, card->queue); - blk_queue_max_discard_sectors(card->queue, - RSXX_HW_BLK_SIZE >> 9); - card->queue->limits.discard_granularity = RSXX_HW_BLK_SIZE; - card->queue->limits.discard_alignment = RSXX_HW_BLK_SIZE; - } - - card->queue->queuedata = card; - - snprintf(card->gendisk->disk_name, sizeof(card->gendisk->disk_name), - "rsxx%d", card->disk_id); - card->gendisk->major = card->major; - card->gendisk->first_minor = 0; - card->gendisk->fops = &rsxx_fops; - card->gendisk->private_data = card; - card->gendisk->queue = card->queue; - - return 0; -} - -void rsxx_destroy_dev(struct rsxx_cardinfo *card) -{ - if (!enable_blkdev) - return; - - put_disk(card->gendisk); - card->gendisk = NULL; - - blk_cleanup_queue(card->queue); - card->queue->queuedata = NULL; - unregister_blkdev(card->major, DRIVER_NAME); -} - -int rsxx_dev_init(void) -{ - bio_meta_pool = KMEM_CACHE(rsxx_bio_meta, SLAB_HWCACHE_ALIGN); - if (!bio_meta_pool) - return -ENOMEM; - - return 0; -} - -void rsxx_dev_cleanup(void) -{ - kmem_cache_destroy(bio_meta_pool); -} - - |