diff options
| author | Sam Bobroff <sbobroff@linux.ibm.com> | 2019-11-18 10:53:53 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-29 10:24:35 +0100 |
| commit | 18faefde87c627b353615f463d9ab4f5520adaa6 (patch) | |
| tree | 56179088e49c51bba4dfb2931e783a3e91c1437a /drivers/gpu | |
| parent | a52766faeab5957844e119af23ef8c8599521ef3 (diff) | |
drm/radeon: fix bad DMA from INTERRUPT_CNTL2
[ Upstream commit 62d91dd2851e8ae2ca552f1b090a3575a4edf759 ]
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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/radeon/cik.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/radeon/r600.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/radeon/si.c | 4 |
3 files changed, 6 insertions, 6 deletions
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index b99f3e59011c..5fcb5869a489 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -7026,8 +7026,8 @@ 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 diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index f2eac6b6c46a..9569c35f8766 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3697,8 +3697,8 @@ 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 diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index b75d809c292e..919d389869ce 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -6018,8 +6018,8 @@ 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 |