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| author | Dave Jiang <dave.jiang@intel.com> | 2021-11-29 10:19:38 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-12-17 21:39:28 +0530 |
| commit | 7930d85535751bc8b05c6731c6b79d874671f13c (patch) | |
| tree | 985eb1029d4206787a3f4b793ca5e5415d1b0c2c /drivers/dma/idxd/device.c | |
| parent | 92452a72ebdf1225aa37690d3648f2af6d0b4fca (diff) | |
| download | lwn-7930d85535751bc8b05c6731c6b79d874671f13c.tar.gz lwn-7930d85535751bc8b05c6731c6b79d874671f13c.zip | |
dmaengine: idxd: add knob for enqcmds retries
Add a sysfs knob to allow tuning of retries for the kernel ENQCMDS
descriptor submission. While on host, it is not as likely that ENQCMDS
return busy during normal operations due to the driver controlling the
number of descriptors allocated for submission. However, when the driver is
operating as a guest driver, the chance of retry goes up significantly due
to sharing a wq with multiple VMs. A default value is provided with the
system admin being able to tune the value on a per WQ basis.
Suggested-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/163820629464.2702134.7577370098568297574.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/idxd/device.c')
| -rw-r--r-- | drivers/dma/idxd/device.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c index 36e213a8108d..5a50ee6f6881 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -387,6 +387,7 @@ static void idxd_wq_disable_cleanup(struct idxd_wq *wq) wq->threshold = 0; wq->priority = 0; wq->ats_dis = 0; + wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES; clear_bit(WQ_FLAG_DEDICATED, &wq->flags); clear_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags); memset(wq->name, 0, WQ_NAME_SIZE); |