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paride: convert pcd to blk-mq

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Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-10-15 08:38:52 -06:00
parent fab1adcf95
commit 89c6b16509
1 changed files with 56 additions and 32 deletions
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88
drivers/block/paride/pcd.c
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@ -137,7 +137,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
#include <linux/delay.h>
#include <linux/cdrom.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
@ -186,7 +186,8 @@ static int pcd_packet(struct cdrom_device_info *cdi,
static int pcd_detect(void);
static void pcd_probe_capabilities(void);
static void do_pcd_read_drq(void);
static void do_pcd_request(struct request_queue * q);
static blk_status_t pcd_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd);
static void do_pcd_read(void);
struct pcd_unit {
@ -199,6 +200,8 @@ struct pcd_unit {
char *name; /* pcd0, pcd1, etc */
struct cdrom_device_info info; /* uniform cdrom interface */
struct gendisk *disk;
struct blk_mq_tag_set tag_set;
struct list_head rq_list;
};
static struct pcd_unit pcd[PCD_UNITS];
@ -292,6 +295,10 @@ static const struct cdrom_device_ops pcd_dops = {
CDC_CD_RW,
};
static const struct blk_mq_ops pcd_mq_ops = {
.queue_rq = pcd_queue_rq,
};
static void pcd_init_units(void)
{
struct pcd_unit *cd;
@ -300,13 +307,19 @@ static void pcd_init_units(void)
pcd_drive_count = 0;
for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
struct gendisk *disk = alloc_disk(1);
if (!disk)
continue;
disk->queue = blk_init_queue(do_pcd_request, &pcd_lock);
if (!disk->queue) {
put_disk(disk);
disk->queue = blk_mq_init_sq_queue(&cd->tag_set, &pcd_mq_ops,
1, BLK_MQ_F_SHOULD_MERGE);
if (IS_ERR(disk->queue)) {
disk->queue = NULL;
continue;
}
INIT_LIST_HEAD(&cd->rq_list);
disk->queue->queuedata = cd;
blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
cd->disk = disk;
cd->pi = &cd->pia;
@ -748,18 +761,18 @@ static int pcd_queue;
static int set_next_request(void)
{
struct pcd_unit *cd;
struct request_queue *q;
int old_pos = pcd_queue;
do {
cd = &pcd[pcd_queue];
q = cd->present ? cd->disk->queue : NULL;
if (++pcd_queue == PCD_UNITS)
pcd_queue = 0;
if (q) {
pcd_req = blk_fetch_request(q);
if (pcd_req)
break;
if (cd->present && !list_empty(&cd->rq_list)) {
pcd_req = list_first_entry(&cd->rq_list, struct request,
queuelist);
list_del_init(&pcd_req->queuelist);
blk_mq_start_request(pcd_req);
break;
}
} while (pcd_queue != old_pos);
@ -768,33 +781,41 @@ static int set_next_request(void)
static void pcd_request(void)
{
struct pcd_unit *cd;
if (pcd_busy)
return;
while (1) {
if (!pcd_req && !set_next_request())
return;
if (rq_data_dir(pcd_req) == READ) {
struct pcd_unit *cd = pcd_req->rq_disk->private_data;
if (cd != pcd_current)
pcd_bufblk = -1;
pcd_current = cd;
pcd_sector = blk_rq_pos(pcd_req);
pcd_count = blk_rq_cur_sectors(pcd_req);
pcd_buf = bio_data(pcd_req->bio);
pcd_busy = 1;
ps_set_intr(do_pcd_read, NULL, 0, nice);
return;
} else {
__blk_end_request_all(pcd_req, BLK_STS_IOERR);
pcd_req = NULL;
}
}
if (!pcd_req && !set_next_request())
return;
cd = pcd_req->rq_disk->private_data;
if (cd != pcd_current)
pcd_bufblk = -1;
pcd_current = cd;
pcd_sector = blk_rq_pos(pcd_req);
pcd_count = blk_rq_cur_sectors(pcd_req);
pcd_buf = bio_data(pcd_req->bio);
pcd_busy = 1;
ps_set_intr(do_pcd_read, NULL, 0, nice);
}
static void do_pcd_request(struct request_queue *q)
static blk_status_t pcd_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct pcd_unit *cd = hctx->queue->queuedata;
if (rq_data_dir(bd->rq) != READ) {
blk_mq_start_request(bd->rq);
return BLK_STS_IOERR;
}
spin_lock_irq(&pcd_lock);
list_add_tail(&bd->rq->queuelist, &cd->rq_list);
pcd_request();
spin_unlock_irq(&pcd_lock);
return BLK_STS_OK;
}
static inline void next_request(blk_status_t err)
@ -802,8 +823,10 @@ static inline void next_request(blk_status_t err)
unsigned long saved_flags;
spin_lock_irqsave(&pcd_lock, saved_flags);
if (!__blk_end_request_cur(pcd_req, err))
if (!blk_update_request(pcd_req, err, blk_rq_cur_bytes(pcd_req))) {
__blk_mq_end_request(pcd_req, err);
pcd_req = NULL;
}
pcd_busy = 0;
pcd_request();
spin_unlock_irqrestore(&pcd_lock, saved_flags);
@ -1011,6 +1034,7 @@ static void __exit pcd_exit(void)
unregister_cdrom(&cd->info);
}
blk_cleanup_queue(cd->disk->queue);
blk_mq_free_tag_set(&cd->tag_set);
put_disk(cd->disk);
}
unregister_blkdev(major, name);