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authorOmar Sandoval <osandov@fb.com>2018-10-15 09:21:34 -0600
committerJens Axboe <axboe@kernel.dk>2018-10-16 09:50:14 -0600
commita9f38e1dec107af70d81338332494bf0a1e76597 (patch)
tree5dc64e6b16373e83f91047b2a8a24206c051995c /drivers/block
parent6ec3938cff95fe792a05fdf4ba14f92977e5e31d (diff)
floppy: convert to blk-mq
This driver likes to fetch requests from all over the place, so make queue_rq put requests on a list so that the logic stays the same. Tested with QEMU. Signed-off-by: Omar Sandoval <osandov@fb.com> Converted to blk_mq_init_sq_queue() and fixed a few spots where the tag_set leaked on cleanup. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/floppy.c66
1 files changed, 36 insertions, 30 deletions
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index c494a771c06f..a8cfa011c284 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -252,13 +252,13 @@ static int allowed_drive_mask = 0x33;
static int irqdma_allocated;
-#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
#include <linux/blkpg.h>
#include <linux/cdrom.h> /* for the compatibility eject ioctl */
#include <linux/completion.h>
+static LIST_HEAD(floppy_reqs);
static struct request *current_req;
-static void do_fd_request(struct request_queue *q);
static int set_next_request(void);
#ifndef fd_get_dma_residue
@@ -414,10 +414,10 @@ static struct floppy_drive_struct drive_state[N_DRIVE];
static struct floppy_write_errors write_errors[N_DRIVE];
static struct timer_list motor_off_timer[N_DRIVE];
static struct gendisk *disks[N_DRIVE];
+static struct blk_mq_tag_set tag_sets[N_DRIVE];
static struct block_device *opened_bdev[N_DRIVE];
static DEFINE_MUTEX(open_lock);
static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
-static int fdc_queue;
/*
* This struct defines the different floppy types.
@@ -2216,8 +2216,9 @@ static void floppy_end_request(struct request *req, blk_status_t error)
/* current_count_sectors can be zero if transfer failed */
if (error)
nr_sectors = blk_rq_cur_sectors(req);
- if (__blk_end_request(req, error, nr_sectors << 9))
+ if (blk_update_request(req, error, nr_sectors << 9))
return;
+ __blk_mq_end_request(req, error);
/* We're done with the request */
floppy_off(drive);
@@ -2797,27 +2798,14 @@ static int make_raw_rw_request(void)
return 2;
}
-/*
- * Round-robin between our available drives, doing one request from each
- */
static int set_next_request(void)
{
- struct request_queue *q;
- int old_pos = fdc_queue;
-
- do {
- q = disks[fdc_queue]->queue;
- if (++fdc_queue == N_DRIVE)
- fdc_queue = 0;
- if (q) {
- current_req = blk_fetch_request(q);
- if (current_req) {
- current_req->error_count = 0;
- break;
- }
- }
- } while (fdc_queue != old_pos);
-
+ current_req = list_first_entry_or_null(&floppy_reqs, struct request,
+ queuelist);
+ if (current_req) {
+ current_req->error_count = 0;
+ list_del_init(&current_req->queuelist);
+ }
return current_req != NULL;
}
@@ -2901,29 +2889,38 @@ static void process_fd_request(void)
schedule_bh(redo_fd_request);
}
-static void do_fd_request(struct request_queue *q)
+static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
{
+ blk_mq_start_request(bd->rq);
+
if (WARN(max_buffer_sectors == 0,
"VFS: %s called on non-open device\n", __func__))
- return;
+ return BLK_STS_IOERR;
if (WARN(atomic_read(&usage_count) == 0,
"warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
current_req, (long)blk_rq_pos(current_req),
(unsigned long long) current_req->cmd_flags))
- return;
+ return BLK_STS_IOERR;
+
+ spin_lock_irq(&floppy_lock);
+ list_add_tail(&bd->rq->queuelist, &floppy_reqs);
+ spin_unlock_irq(&floppy_lock);
if (test_and_set_bit(0, &fdc_busy)) {
/* fdc busy, this new request will be treated when the
current one is done */
is_alive(__func__, "old request running");
- return;
+ return BLK_STS_OK;
}
+
command_status = FD_COMMAND_NONE;
__reschedule_timeout(MAXTIMEOUT, "fd_request");
set_fdc(0);
process_fd_request();
is_alive(__func__, "");
+ return BLK_STS_OK;
}
static const struct cont_t poll_cont = {
@@ -4486,6 +4483,10 @@ static struct platform_driver floppy_driver = {
},
};
+static const struct blk_mq_ops floppy_mq_ops = {
+ .queue_rq = floppy_queue_rq,
+};
+
static struct platform_device floppy_device[N_DRIVE];
static bool floppy_available(int drive)
@@ -4533,9 +4534,12 @@ static int __init do_floppy_init(void)
goto out_put_disk;
}
- disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
- if (!disks[drive]->queue) {
- err = -ENOMEM;
+ disks[drive]->queue = blk_mq_init_sq_queue(&tag_sets[drive],
+ &floppy_mq_ops, 2,
+ BLK_MQ_F_SHOULD_MERGE);
+ if (IS_ERR(disks[drive]->queue)) {
+ err = PTR_ERR(disks[drive]->queue);
+ disks[drive]->queue = NULL;
goto out_put_disk;
}
@@ -4708,6 +4712,7 @@ out_put_disk:
del_timer_sync(&motor_off_timer[drive]);
blk_cleanup_queue(disks[drive]->queue);
disks[drive]->queue = NULL;
+ blk_mq_free_tag_set(&tag_sets[drive]);
}
put_disk(disks[drive]);
}
@@ -4935,6 +4940,7 @@ static void __exit floppy_module_exit(void)
platform_device_unregister(&floppy_device[drive]);
}
blk_cleanup_queue(disks[drive]->queue);
+ blk_mq_free_tag_set(&tag_sets[drive]);
/*
* These disks have not called add_disk(). Don't put down