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mtip32xx: Workaround for unaligned writes
Workaround for handling unaligned writes: limit number of outstanding unaligned writes Signed-off-by: Sam Bradshaw <sbradshaw@micron.com> Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Asai Thambi S P
Jens Axboe
parent
68466cbf92
commit
2077d94726
@ -712,7 +712,10 @@ static void mtip_async_complete(struct mtip_port *port,
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atomic_set(&port->commands[tag].active, 0);
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release_slot(port, tag);
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up(&port->cmd_slot);
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if (unlikely(command->unaligned))
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up(&port->cmd_slot_unal);
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else
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up(&port->cmd_slot);
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}
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/*
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@ -2557,7 +2560,7 @@ static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
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*/
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static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
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int nsect, int nents, int tag, void *callback,
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void *data, int dir)
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void *data, int dir, int unaligned)
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{
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struct host_to_dev_fis *fis;
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struct mtip_port *port = dd->port;
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@ -2570,6 +2573,7 @@ static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
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command->scatter_ents = nents;
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command->unaligned = unaligned;
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/*
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* The number of retries for this command before it is
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* reported as a failure to the upper layers.
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@ -2598,6 +2602,9 @@ static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
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fis->res3 = 0;
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fill_command_sg(dd, command, nents);
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if (unaligned)
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fis->device |= 1 << 7;
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/* Populate the command header */
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command->command_header->opts =
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__force_bit2int cpu_to_le32(
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@ -2644,9 +2651,13 @@ static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
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* return value
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* None
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*/
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static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
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static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag,
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int unaligned)
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{
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struct semaphore *sem = unaligned ? &dd->port->cmd_slot_unal :
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&dd->port->cmd_slot;
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release_slot(dd->port, tag);
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up(sem);
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}
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/*
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@ -2661,22 +2672,25 @@ static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
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* or NULL if no command slots are available.
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*/
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static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
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int *tag)
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int *tag, int unaligned)
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{
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struct semaphore *sem = unaligned ? &dd->port->cmd_slot_unal :
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&dd->port->cmd_slot;
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/*
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* It is possible that, even with this semaphore, a thread
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* may think that no command slots are available. Therefore, we
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* need to make an attempt to get_slot().
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*/
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down(&dd->port->cmd_slot);
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down(sem);
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*tag = get_slot(dd->port);
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if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
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up(&dd->port->cmd_slot);
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up(sem);
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return NULL;
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}
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if (unlikely(*tag < 0)) {
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up(&dd->port->cmd_slot);
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up(sem);
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return NULL;
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}
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@ -2909,6 +2923,11 @@ static inline void hba_setup(struct driver_data *dd)
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dd->mmio + HOST_HSORG);
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}
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static int mtip_device_unaligned_constrained(struct driver_data *dd)
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{
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return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
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}
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/*
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* Detect the details of the product, and store anything needed
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* into the driver data structure. This includes product type and
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@ -3131,8 +3150,15 @@ static int mtip_hw_init(struct driver_data *dd)
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for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
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dd->work[i].port = dd->port;
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/* Enable unaligned IO constraints for some devices */
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if (mtip_device_unaligned_constrained(dd))
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dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
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else
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dd->unal_qdepth = 0;
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/* Counting semaphore to track command slot usage */
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sema_init(&dd->port->cmd_slot, num_command_slots - 1);
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sema_init(&dd->port->cmd_slot, num_command_slots - 1 - dd->unal_qdepth);
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sema_init(&dd->port->cmd_slot_unal, dd->unal_qdepth);
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/* Spinlock to prevent concurrent issue */
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for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
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@ -3735,7 +3761,7 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
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struct scatterlist *sg;
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struct bio_vec *bvec;
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int nents = 0;
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int tag = 0;
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int tag = 0, unaligned = 0;
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if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
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if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
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@ -3771,7 +3797,15 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
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return;
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}
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sg = mtip_hw_get_scatterlist(dd, &tag);
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if (bio_data_dir(bio) == WRITE && bio_sectors(bio) <= 64 &&
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dd->unal_qdepth) {
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if (bio->bi_sector % 8 != 0) /* Unaligned on 4k boundaries */
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unaligned = 1;
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else if (bio_sectors(bio) % 8 != 0) /* Aligned but not 4k/8k */
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unaligned = 1;
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}
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sg = mtip_hw_get_scatterlist(dd, &tag, unaligned);
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if (likely(sg != NULL)) {
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blk_queue_bounce(queue, &bio);
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@ -3779,7 +3813,7 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
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dev_warn(&dd->pdev->dev,
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"Maximum number of SGL entries exceeded\n");
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bio_io_error(bio);
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mtip_hw_release_scatterlist(dd, tag);
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mtip_hw_release_scatterlist(dd, tag, unaligned);
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return;
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}
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@ -3799,7 +3833,8 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
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tag,
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bio_endio,
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bio,
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bio_data_dir(bio));
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bio_data_dir(bio),
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unaligned);
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} else
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bio_io_error(bio);
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}
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@ -52,6 +52,9 @@
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#define MTIP_FTL_REBUILD_MAGIC 0xED51
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#define MTIP_FTL_REBUILD_TIMEOUT_MS 2400000
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/* unaligned IO handling */
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#define MTIP_MAX_UNALIGNED_SLOTS 8
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/* Macro to extract the tag bit number from a tag value. */
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#define MTIP_TAG_BIT(tag) (tag & 0x1F)
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@ -333,6 +336,8 @@ struct mtip_cmd {
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int scatter_ents; /* Number of scatter list entries used */
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int unaligned; /* command is unaligned on 4k boundary */
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struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
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int retries; /* The number of retries left for this command. */
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@ -452,6 +457,10 @@ struct mtip_port {
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* command slots available.
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*/
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struct semaphore cmd_slot;
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/* Semaphore to control queue depth of unaligned IOs */
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struct semaphore cmd_slot_unal;
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/* Spinlock for working around command-issue bug. */
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spinlock_t cmd_issue_lock[MTIP_MAX_SLOT_GROUPS];
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};
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@ -501,6 +510,8 @@ struct driver_data {
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atomic_t irq_workers_active;
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int isr_binding;
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int unal_qdepth; /* qdepth of unaligned IO queue */
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};
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#endif
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