John Harrison
1aed78cfda
drm/i915: Don't use BAR mappings for ring buffers with LLC ...
commit 85636167e3206c3fbd52254fc432991cc4e90194 upstream.
Direction from hardware is that ring buffers should never be mapped
via the BAR on systems with LLC. There are too many caching pitfalls
due to the way BAR accesses are routed. So it is safest to just not
use it.
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Fixes: 9d80841ea4intel-gfx@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v4.9+
Tested-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230216011101.1909009-3-John.C.Harrison@Intel.com
(cherry picked from commit 65c08339db1ada87afd6cfe7db8e60bb4851d919)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-17 08:32:53 +01:00
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WRITE is "data source", not destination...
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drm/i915: Don't use BAR mappings for ring buffers with LLC
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fix "direction" argument of iov_iter_kvec()
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1aed78cfda