diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2016-05-11 21:32:49 (GMT) |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-05-14 08:06:52 (GMT) |
| commit | 511deae0261c839461948f2d4d1c13b8c8a59cd8 (patch) | |
| tree | df07879dfeb5b9e5401c1dc99d364a1b2af9b354 /drivers/dma/ioat/init.c | |
| parent | 3b2bc8a732a8dc2a7c4407aea64127229eb8fdd1 (diff) | |
| download | linux-511deae0261c839461948f2d4d1c13b8c8a59cd8.tar.xz | |
dmaengine: ioatdma: disable relaxed ordering for ioatdma
ioatdma by default is in snoop mode. Relaxed ordering according to spec
does not do anything in snoop mode. However, it causes hang or significant
performance degrade when tested with NTB. Disabling in the driver due to
some BIOS do not configure it correctly.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/ioat/init.c')
| -rw-r--r-- | drivers/dma/ioat/init.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c index d4c63d4..d406056 100644 --- a/drivers/dma/ioat/init.c +++ b/drivers/dma/ioat/init.c @@ -1073,6 +1073,7 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca) struct ioatdma_chan *ioat_chan; bool is_raid_device = false; int err; + u16 val16; dma = &ioat_dma->dma_dev; dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock; @@ -1172,6 +1173,17 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca) if (dca) ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base); + /* disable relaxed ordering */ + err = pcie_capability_read_word(pdev, IOAT_DEVCTRL_OFFSET, &val16); + if (err) + return err; + + /* clear relaxed ordering enable */ + val16 &= ~IOAT_DEVCTRL_ROE; + err = pcie_capability_write_word(pdev, IOAT_DEVCTRL_OFFSET, val16); + if (err) + return err; + return 0; } |