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| author |  Dave Jiang <dave.jiang@intel.com>
| 2021-07-20 13:42:04 -0700 |
|---|---|---|
| committer |  Vinod Koul <vkoul@kernel.org>
| 2021-07-28 17:55:40 +0530 |
| commit | a9c171527a3403cae6c1907744b1bc9ca301f912 (patch) | |
| tree | ebd6d0900995c21d96fd6a18f9215746bedf3a33 /drivers/dma/idxd/device.c | |
| parent | dmaengine: idxd: fix wq slot allocation index check (diff) | |
| download | linux-a9c171527a3403cae6c1907744b1bc9ca301f912.tar.gz linux-a9c171527a3403cae6c1907744b1bc9ca301f912.tar.bz2 linux-a9c171527a3403cae6c1907744b1bc9ca301f912.zip | |
dmaengine: idxd: rotate portal address for better performance
The device submission portal is on a 4k page and any of those 64bit aligned
address on the page can be used for descriptor submission. By rotating the
offset through the 4k range and prevent successive writes to the same MMIO
address, performance improvement is observed through testing.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162681372446.1968485.10634280461681015569.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 99350ac9a292..41f67a195eb6 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -320,6 +320,7 @@ void idxd_wq_unmap_portal(struct idxd_wq *wq) devm_iounmap(dev, wq->portal); wq->portal = NULL; + wq->portal_offset = 0; } void idxd_wqs_unmap_portal(struct idxd_device *idxd) |