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gdrom: convert to blk-mq
Ditch the deffered list, lock, and workqueue handling. Just mark the set as being blocking, so we are invoked from a workqueue already. Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
a9f38e1dec
commit
ad5fc6bb72
1 changed files with 77 additions and 93 deletions
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@ -31,12 +31,11 @@
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#include <linux/cdrom.h>
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#include <linux/genhd.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#include <scsi/scsi.h>
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#include <asm/io.h>
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@ -102,11 +101,6 @@ static int gdrom_major;
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static DECLARE_WAIT_QUEUE_HEAD(command_queue);
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static DECLARE_WAIT_QUEUE_HEAD(request_queue);
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static DEFINE_SPINLOCK(gdrom_lock);
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static void gdrom_readdisk_dma(struct work_struct *work);
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static DECLARE_WORK(work, gdrom_readdisk_dma);
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static LIST_HEAD(gdrom_deferred);
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struct gdromtoc {
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unsigned int entry[99];
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unsigned int first, last;
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@ -122,6 +116,7 @@ static struct gdrom_unit {
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char disk_type;
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struct gdromtoc *toc;
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struct request_queue *gdrom_rq;
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struct blk_mq_tag_set tag_set;
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} gd;
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struct gdrom_id {
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@ -584,103 +579,83 @@ static int gdrom_set_interrupt_handlers(void)
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* 9 -> sectors >> 8
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* 10 -> sectors
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*/
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static void gdrom_readdisk_dma(struct work_struct *work)
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static blk_status_t gdrom_readdisk_dma(struct request *req)
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{
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int block, block_cnt;
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blk_status_t err;
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struct packet_command *read_command;
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struct list_head *elem, *next;
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struct request *req;
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unsigned long timeout;
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if (list_empty(&gdrom_deferred))
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return;
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read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
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if (!read_command)
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return; /* get more memory later? */
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return BLK_STS_RESOURCE;
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read_command->cmd[0] = 0x30;
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read_command->cmd[1] = 0x20;
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spin_lock(&gdrom_lock);
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list_for_each_safe(elem, next, &gdrom_deferred) {
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req = list_entry(elem, struct request, queuelist);
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spin_unlock(&gdrom_lock);
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block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
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block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
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__raw_writel(virt_to_phys(bio_data(req->bio)), GDROM_DMA_STARTADDR_REG);
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__raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
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__raw_writel(1, GDROM_DMA_DIRECTION_REG);
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__raw_writel(1, GDROM_DMA_ENABLE_REG);
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read_command->cmd[2] = (block >> 16) & 0xFF;
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read_command->cmd[3] = (block >> 8) & 0xFF;
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read_command->cmd[4] = block & 0xFF;
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read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
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read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
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read_command->cmd[10] = block_cnt & 0xFF;
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/* set for DMA */
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__raw_writeb(1, GDROM_ERROR_REG);
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/* other registers */
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__raw_writeb(0, GDROM_SECNUM_REG);
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__raw_writeb(0, GDROM_BCL_REG);
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__raw_writeb(0, GDROM_BCH_REG);
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__raw_writeb(0, GDROM_DSEL_REG);
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__raw_writeb(0, GDROM_INTSEC_REG);
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/* Wait for registers to reset after any previous activity */
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timeout = jiffies + HZ / 2;
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while (gdrom_is_busy() && time_before(jiffies, timeout))
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cpu_relax();
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__raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
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timeout = jiffies + HZ / 2;
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/* Wait for packet command to finish */
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while (gdrom_is_busy() && time_before(jiffies, timeout))
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cpu_relax();
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gd.pending = 1;
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gd.transfer = 1;
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outsw(GDROM_DATA_REG, &read_command->cmd, 6);
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timeout = jiffies + HZ / 2;
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/* Wait for any pending DMA to finish */
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while (__raw_readb(GDROM_DMA_STATUS_REG) &&
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time_before(jiffies, timeout))
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cpu_relax();
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/* start transfer */
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__raw_writeb(1, GDROM_DMA_STATUS_REG);
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wait_event_interruptible_timeout(request_queue,
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gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
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err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
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gd.transfer = 0;
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gd.pending = 0;
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/* now seek to take the request spinlock
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* before handling ending the request */
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spin_lock(&gdrom_lock);
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list_del_init(&req->queuelist);
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__blk_end_request_all(req, err);
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}
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spin_unlock(&gdrom_lock);
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block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
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block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
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__raw_writel(virt_to_phys(bio_data(req->bio)), GDROM_DMA_STARTADDR_REG);
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__raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
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__raw_writel(1, GDROM_DMA_DIRECTION_REG);
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__raw_writel(1, GDROM_DMA_ENABLE_REG);
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read_command->cmd[2] = (block >> 16) & 0xFF;
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read_command->cmd[3] = (block >> 8) & 0xFF;
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read_command->cmd[4] = block & 0xFF;
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read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
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read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
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read_command->cmd[10] = block_cnt & 0xFF;
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/* set for DMA */
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__raw_writeb(1, GDROM_ERROR_REG);
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/* other registers */
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__raw_writeb(0, GDROM_SECNUM_REG);
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__raw_writeb(0, GDROM_BCL_REG);
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__raw_writeb(0, GDROM_BCH_REG);
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__raw_writeb(0, GDROM_DSEL_REG);
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__raw_writeb(0, GDROM_INTSEC_REG);
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/* Wait for registers to reset after any previous activity */
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timeout = jiffies + HZ / 2;
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while (gdrom_is_busy() && time_before(jiffies, timeout))
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cpu_relax();
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__raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
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timeout = jiffies + HZ / 2;
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/* Wait for packet command to finish */
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while (gdrom_is_busy() && time_before(jiffies, timeout))
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cpu_relax();
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gd.pending = 1;
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gd.transfer = 1;
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outsw(GDROM_DATA_REG, &read_command->cmd, 6);
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timeout = jiffies + HZ / 2;
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/* Wait for any pending DMA to finish */
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while (__raw_readb(GDROM_DMA_STATUS_REG) &&
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time_before(jiffies, timeout))
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cpu_relax();
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/* start transfer */
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__raw_writeb(1, GDROM_DMA_STATUS_REG);
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wait_event_interruptible_timeout(request_queue,
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gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
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err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
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gd.transfer = 0;
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gd.pending = 0;
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blk_mq_end_request(req, err);
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kfree(read_command);
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return BLK_STS_OK;
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}
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static void gdrom_request(struct request_queue *rq)
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static blk_status_t gdrom_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *bd)
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{
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struct request *req;
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blk_mq_start_request(bd->rq);
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while ((req = blk_fetch_request(rq)) != NULL) {
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switch (req_op(req)) {
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case REQ_OP_READ:
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/*
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* Add to list of deferred work and then schedule
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* workqueue.
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*/
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list_add_tail(&req->queuelist, &gdrom_deferred);
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schedule_work(&work);
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break;
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case REQ_OP_WRITE:
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pr_notice("Read only device - write request ignored\n");
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__blk_end_request_all(req, BLK_STS_IOERR);
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break;
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default:
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printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
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__blk_end_request_all(req, BLK_STS_IOERR);
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break;
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}
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switch (req_op(bd->rq)) {
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case REQ_OP_READ:
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return gdrom_readdisk_dma(bd->rq);
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case REQ_OP_WRITE:
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pr_notice("Read only device - write request ignored\n");
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return BLK_STS_IOERR;
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default:
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printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
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return BLK_STS_IOERR;
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}
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}
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@ -768,6 +743,10 @@ static int probe_gdrom_setupqueue(void)
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return gdrom_init_dma_mode();
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}
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static const struct blk_mq_ops gdrom_mq_ops = {
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.queue_rq = gdrom_queue_rq,
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};
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/*
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* register this as a block device and as compliant with the
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* universal CD Rom driver interface
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@ -811,11 +790,15 @@ static int probe_gdrom(struct platform_device *devptr)
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err = gdrom_set_interrupt_handlers();
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if (err)
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goto probe_fail_cmdirq_register;
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gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
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if (!gd.gdrom_rq) {
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err = -ENOMEM;
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gd.gdrom_rq = blk_mq_init_sq_queue(&gd.tag_set, &gdrom_mq_ops, 1,
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BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
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if (IS_ERR(gd.gdrom_rq)) {
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rc = PTR_ERR(gd.gdrom_rq);
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gd.gdrom_rq = NULL;
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goto probe_fail_requestq;
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}
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blk_queue_bounce_limit(gd.gdrom_rq, BLK_BOUNCE_HIGH);
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err = probe_gdrom_setupqueue();
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@ -832,6 +815,7 @@ static int probe_gdrom(struct platform_device *devptr)
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probe_fail_toc:
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blk_cleanup_queue(gd.gdrom_rq);
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blk_mq_free_tag_set(&gd.tag_set);
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probe_fail_requestq:
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free_irq(HW_EVENT_GDROM_DMA, &gd);
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free_irq(HW_EVENT_GDROM_CMD, &gd);
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@ -849,8 +833,8 @@ static int probe_gdrom(struct platform_device *devptr)
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static int remove_gdrom(struct platform_device *devptr)
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{
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flush_work(&work);
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blk_cleanup_queue(gd.gdrom_rq);
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blk_mq_free_tag_set(&gd.tag_set);
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free_irq(HW_EVENT_GDROM_CMD, &gd);
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free_irq(HW_EVENT_GDROM_DMA, &gd);
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del_gendisk(gd.disk);
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