drm/radeon: fix bad DMA from INTERRUPT_CNTL2

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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: d8f60cfc93 ("drm/radeon/kms: Add support for interrupts on r6xx/r7xx chips (v3)")
Fixes: 25a857fbe9 ("drm/radeon/kms: add support for interrupts on SI")
Fixes: a59781bbe5 ("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>

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This commit is contained in:

Sam Bobroff 2019-11-18 10:53:53 +11:00 • committed by Alex Deucher

parent dc9b3dbd28

commit a542ad9e5d

3 changed files with 6 additions and 6 deletions

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4

drivers/gpu/drm/radeon/cik.c

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4

drivers/gpu/drm/radeon/r600.c

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4

drivers/gpu/drm/radeon/si.c

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