The retry CAM can filter interrupts which occur repeatedly, such as page fault interrupts when retry faults are enabled. This makes processing those interrupts much more efficient, because the CPU won't have to deal with processing the same interrupt repeatedly.
Signed-off-by: Timur Kristóf <[email protected]> --- drivers/gpu/drm/amd/amdgpu/ih_v6_0.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c b/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c index a97c85b0cb99..bbe399f9e233 100644 --- a/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c +++ b/drivers/gpu/drm/amd/amdgpu/ih_v6_0.c @@ -397,6 +397,16 @@ static int ih_v6_0_irq_init(struct amdgpu_device *adev) pci_set_master(adev->pdev); + if (!(adev->flags & AMD_IS_APU)) { + /* Enable IH Retry CAM */ + tmp = RREG32_SOC15(OSSSYS, 0, regIH_RETRY_INT_CAM_CNTL); + tmp = REG_SET_FIELD(tmp, IH_RETRY_INT_CAM_CNTL, ENABLE, 1); + tmp = REG_SET_FIELD(tmp, IH_RETRY_INT_CAM_CNTL, CAM_SIZE, 0xF); + WREG32_SOC15(OSSSYS, 0, regIH_RETRY_INT_CAM_CNTL, tmp); + + adev->irq.retry_cam_enabled = true; + } + /* enable interrupts */ ret = ih_v6_0_toggle_interrupts(adev, true); if (ret) -- 2.54.0
