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ps3disk: convert to blk-mq 

Convert from the old request_fn style driver to blk-mq.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-10-15 13:32:01 -06:00
parent 9316a9ed68
commit fab1adcf95
1 changed files with 44 additions and 42 deletions
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86
drivers/block/ps3disk.c
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@ -19,7 +19,7 @@
*/
#include <linux/ata.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/slab.h>
#include <linux/module.h>
@ -42,6 +42,7 @@
struct ps3disk_private {
spinlock_t lock; /* Request queue spinlock */
struct request_queue *queue;
struct blk_mq_tag_set tag_set;
struct gendisk *gendisk;
unsigned int blocking_factor;
struct request *req;
@ -118,8 +119,8 @@ static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
}
}
static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
struct request *req)
static blk_status_t ps3disk_submit_request_sg(struct ps3_storage_device *dev,
struct request *req)
{
struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
int write = rq_data_dir(req), res;
@ -158,16 +159,15 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
if (res) {
dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
__LINE__, op, res);
__blk_end_request_all(req, BLK_STS_IOERR);
return 0;
return BLK_STS_IOERR;
}
priv->req = req;
return 1;
return BLK_STS_OK;
}
static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
struct request *req)
static blk_status_t ps3disk_submit_flush_request(struct ps3_storage_device *dev,
struct request *req)
{
struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
u64 res;
@ -180,50 +180,45 @@ static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
if (res) {
dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
__func__, __LINE__, res);
__blk_end_request_all(req, BLK_STS_IOERR);
return 0;
return BLK_STS_IOERR;
}
priv->req = req;
return 1;
return BLK_STS_OK;
}
static void ps3disk_do_request(struct ps3_storage_device *dev,
struct request_queue *q)
static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev,
struct request *req)
{
struct request *req;
dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
while ((req = blk_fetch_request(q))) {
switch (req_op(req)) {
case REQ_OP_FLUSH:
if (ps3disk_submit_flush_request(dev, req))
return;
break;
case REQ_OP_READ:
case REQ_OP_WRITE:
if (ps3disk_submit_request_sg(dev, req))
return;
break;
default:
blk_dump_rq_flags(req, DEVICE_NAME " bad request");
__blk_end_request_all(req, BLK_STS_IOERR);
}
switch (req_op(req)) {
case REQ_OP_FLUSH:
return ps3disk_submit_flush_request(dev, req);
case REQ_OP_READ:
case REQ_OP_WRITE:
return ps3disk_submit_request_sg(dev, req);
default:
blk_dump_rq_flags(req, DEVICE_NAME " bad request");
return BLK_STS_IOERR;
}
}
static void ps3disk_request(struct request_queue *q)
static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct request_queue *q = hctx->queue;
struct ps3_storage_device *dev = q->queuedata;
struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
blk_status_t ret;
if (priv->req) {
dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
return;
}
blk_mq_start_request(bd->rq);
ps3disk_do_request(dev, q);
spin_lock_irq(&priv->lock);
ret = ps3disk_do_request(dev, bd->rq);
spin_unlock_irq(&priv->lock);
return ret;
}
static irqreturn_t ps3disk_interrupt(int irq, void *data)
@ -280,11 +275,11 @@ static irqreturn_t ps3disk_interrupt(int irq, void *data)
}
spin_lock(&priv->lock);
__blk_end_request_all(req, error);
priv->req = NULL;
ps3disk_do_request(dev, priv->queue);
blk_mq_end_request(req, error);
spin_unlock(&priv->lock);
blk_mq_run_hw_queues(priv->queue, true);
return IRQ_HANDLED;
}
@ -404,6 +399,10 @@ static unsigned long ps3disk_mask;
static DEFINE_MUTEX(ps3disk_mask_mutex);
static const struct blk_mq_ops ps3disk_mq_ops = {
.queue_rq = ps3disk_queue_rq,
};
static int ps3disk_probe(struct ps3_system_bus_device *_dev)
{
struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
@ -454,11 +453,12 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev)
ps3disk_identify(dev);
queue = blk_init_queue(ps3disk_request, &priv->lock);
if (!queue) {
dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
queue = blk_mq_init_sq_queue(&priv->tag_set, &ps3disk_mq_ops, 1,
BLK_MQ_F_SHOULD_MERGE);
if (IS_ERR(queue)) {
dev_err(&dev->sbd.core, "%s:%u: blk_mq_init_queue failed\n",
__func__, __LINE__);
error = -ENOMEM;
error = PTR_ERR(queue);
goto fail_teardown;
}
@ -505,6 +505,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev)
fail_cleanup_queue:
blk_cleanup_queue(queue);
blk_mq_free_tag_set(&priv->tag_set);
fail_teardown:
ps3stor_teardown(dev);
fail_free_bounce:
@ -530,6 +531,7 @@ static int ps3disk_remove(struct ps3_system_bus_device *_dev)
mutex_unlock(&ps3disk_mask_mutex);
del_gendisk(priv->gendisk);
blk_cleanup_queue(priv->queue);
blk_mq_free_tag_set(&priv->tag_set);
put_disk(priv->gendisk);
dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
ps3disk_sync_cache(dev);