Commit b992691d authored by Sam Bobroff's avatar Sam Bobroff Committed by Alex Deucher

drm/amdgpu: fix bad DMA from INTERRUPT_CNTL2

The INTERRUPT_CNTL2 register expects a valid DMA address, but is
currently set with a GPU MC address.  This can cause problems on
systems that detect the resulting DMA read from an invalid address
(found on a Power8 guest).

Instead, use the DMA address of the dummy page because it will always
be safe.

Fixes: 27ae1064 ("drm/amdgpu: add interupt handler implementation for si v3")
Signed-off-by: default avatarSam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent a542ad9e
......@@ -64,7 +64,8 @@ static int si_ih_irq_init(struct amdgpu_device *adev)
u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
si_ih_disable_interrupts(adev);
WREG32(INTERRUPT_CNTL2, adev->irq.ih.gpu_addr >> 8);
/* set dummy read address to dummy page address */
WREG32(INTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
interrupt_cntl = RREG32(INTERRUPT_CNTL);
interrupt_cntl &= ~IH_DUMMY_RD_OVERRIDE;
interrupt_cntl &= ~IH_REQ_NONSNOOP_EN;
......
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