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drm/i915/guc: Limit scheduling properties to avoid overflow

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[ Upstream commit 568944af44 ]

GuC converts the pre-emption timeout and timeslice quantum values into
clock ticks internally. That significantly reduces the point of 32bit
overflow. On current platforms, worst case scenario is approximately
110 seconds. Rather than allowing the user to set higher values and
then get confused by early timeouts, add limits when setting these
values.

v2: Add helper functions for clamping (review feedback from Tvrtko).
v3: Add a bunch of BUG_ON range checks in addition to the checks
already in the clamping functions (Tvrtko)

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221006213813.1563435-2-John.C.Harrison@Intel.com
Stable-dep-of: c3bd49cd9a ("drm/i915: Fix compute pre-emption w/a to apply to compute engines")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
John Harrison 2022-10-06 14:38:10 -07:00 • committed by Greg Kroah-Hartman
commit 72b414661d
5 changed files with 119 additions and 10 deletions
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