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authorDave Jiang <dave.jiang@intel.com>2021-11-29 18:19:38 +0100
committerVinod Koul <vkoul@kernel.org>2021-12-17 17:09:28 +0100
commit7930d85535751bc8b05c6731c6b79d874671f13c (patch)
tree985eb1029d4206787a3f4b793ca5e5415d1b0c2c /drivers/dma/idxd/irq.c
parentdmaengine: idxd: set defaults for wq configs (diff)
downloadlinux-7930d85535751bc8b05c6731c6b79d874671f13c.tar.xz
linux-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/irq.c')
-rw-r--r--drivers/dma/idxd/irq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
index a3bf3ea84587..0b0055a0ad2a 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -98,7 +98,7 @@ static void idxd_int_handle_revoke_drain(struct idxd_irq_entry *ie)
if (wq_dedicated(wq)) {
iosubmit_cmds512(portal, &desc, 1);
} else {
- rc = enqcmds(portal, &desc);
+ rc = idxd_enqcmds(wq, portal, &desc);
/* This should not fail unless hardware failed. */
if (rc < 0)
dev_warn(dev, "Failed to submit drain desc on wq %d\n", wq->id);