@@ -6969,8 +6969,8 @@ static int cik_irq_init(struct radeon_device *rdev)
}
/* setup interrupt control */
- /* XXX this should actually be a bus address, not an MC address. same on older asics */
- WREG32(INTERRUPT_CNTL2, rdev->ih.gpu_addr >> 8);
+ /* set dummy read address to dummy page address */
+ WREG32(INTERRUPT_CNTL2, rdev->dummy_page.addr >> 8);
interrupt_cntl = RREG32(INTERRUPT_CNTL);
/* IH_DUMMY_RD_OVERRIDE=0 - dummy read disabled with msi, enabled without msi
* IH_DUMMY_RD_OVERRIDE=1 - dummy read controlled by IH_DUMMY_RD_EN
@@ -3696,8 +3696,8 @@ int r600_irq_init(struct radeon_device *rdev)
}
/* setup interrupt control */
- /* set dummy read address to ring address */
- WREG32(INTERRUPT_CNTL2, rdev->ih.gpu_addr >> 8);
+ /* set dummy read address to dummy page address */
+ WREG32(INTERRUPT_CNTL2, rdev->dummy_page.addr >> 8);
interrupt_cntl = RREG32(INTERRUPT_CNTL);
/* IH_DUMMY_RD_OVERRIDE=0 - dummy read disabled with msi, enabled without msi
* IH_DUMMY_RD_OVERRIDE=1 - dummy read controlled by IH_DUMMY_RD_EN
@@ -5997,8 +5997,8 @@ static int si_irq_init(struct radeon_device *rdev)
}
/* setup interrupt control */
- /* set dummy read address to ring address */
- WREG32(INTERRUPT_CNTL2, rdev->ih.gpu_addr >> 8);
+ /* set dummy read address to dummy page address */
+ WREG32(INTERRUPT_CNTL2, rdev->dummy_page.addr >> 8);
interrupt_cntl = RREG32(INTERRUPT_CNTL);
/* IH_DUMMY_RD_OVERRIDE=0 - dummy read disabled with msi, enabled without msi
* IH_DUMMY_RD_OVERRIDE=1 - dummy read controlled by IH_DUMMY_RD_EN
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: d8f60cfc9345 ("drm/radeon/kms: Add support for interrupts on r6xx/r7xx chips (v3)") Fixes: 25a857fbe973 ("drm/radeon/kms: add support for interrupts on SI") Fixes: a59781bbe528 ("drm/radeon: add support for interrupts on CIK (v5)") Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> --- v2 - Split amdgpu changes into separate patch. drivers/gpu/drm/radeon/cik.c | 4 ++-- drivers/gpu/drm/radeon/r600.c | 4 ++-- drivers/gpu/drm/radeon/si.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-)