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rsxx: Fixes soft-lockup issues during DMAs.

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The workqueue mechanism has been reworked to prevent soft
lockup issues from occuring by adding in mutex sychronization.

Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Philip J Kelleher 2013-06-18 14:38:26 -05:00 committed by Jens Axboe
parent 0ab4743ebc
commit 31a70bb444
2 changed files with 28 additions and 8 deletions
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35
drivers/block/rsxx/dma.c
View File

@ -381,15 +381,13 @@ static void dma_engine_stalled(unsigned long data)
}
}
static void rsxx_issue_dmas(struct work_struct *work)
static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
int tag;
int cmds_pending = 0;
struct hw_cmd *hw_cmd_buf;
ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work);
hw_cmd_buf = ctrl->cmd.buf;
if (unlikely(ctrl->card->halt) ||
@ -469,9 +467,8 @@ static void rsxx_issue_dmas(struct work_struct *work)
}
}
static void rsxx_dma_done(struct work_struct *work)
static void rsxx_dma_done(struct rsxx_dma_ctrl *ctrl)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
unsigned long flags;
u16 count;
@ -479,7 +476,6 @@ static void rsxx_dma_done(struct work_struct *work)
u8 tag;
struct hw_status *hw_st_buf;
ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work);
hw_st_buf = ctrl->status.buf;
if (unlikely(ctrl->card->halt) ||
@ -555,6 +551,28 @@ static void rsxx_dma_done(struct work_struct *work)
spin_unlock_bh(&ctrl->queue_lock);
}
static void rsxx_schedule_issue(struct work_struct *work)
{
struct rsxx_dma_ctrl *ctrl;
ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work);
mutex_lock(&ctrl->work_lock);
rsxx_issue_dmas(ctrl);
mutex_unlock(&ctrl->work_lock);
}
static void rsxx_schedule_done(struct work_struct *work)
{
struct rsxx_dma_ctrl *ctrl;
ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work);
mutex_lock(&ctrl->work_lock);
rsxx_dma_done(ctrl);
mutex_unlock(&ctrl->work_lock);
}
static int rsxx_queue_discard(struct rsxx_cardinfo *card,
struct list_head *q,
unsigned int laddr,
@ -789,6 +807,7 @@ static int rsxx_dma_ctrl_init(struct pci_dev *dev,
spin_lock_init(&ctrl->trackers->lock);
spin_lock_init(&ctrl->queue_lock);
mutex_init(&ctrl->work_lock);
INIT_LIST_HEAD(&ctrl->queue);
setup_timer(&ctrl->activity_timer, dma_engine_stalled,
@ -802,8 +821,8 @@ static int rsxx_dma_ctrl_init(struct pci_dev *dev,
if (!ctrl->done_wq)
return -ENOMEM;
INIT_WORK(&ctrl->issue_dma_work, rsxx_issue_dmas);
INIT_WORK(&ctrl->dma_done_work, rsxx_dma_done);
INIT_WORK(&ctrl->issue_dma_work, rsxx_schedule_issue);
INIT_WORK(&ctrl->dma_done_work, rsxx_schedule_done);
st = rsxx_hw_buffers_init(dev, ctrl);
if (st)

1
drivers/block/rsxx/rsxx_priv.h
View File

@ -115,6 +115,7 @@ struct rsxx_dma_ctrl {
struct timer_list activity_timer;
struct dma_tracker_list *trackers;
struct rsxx_dma_stats stats;
struct mutex work_lock;
};
struct rsxx_cardinfo {