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drm/i915/mtl: Disable stolen memory backed FB for A0

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Stolen memory is not usable for MTL A0 stepping beyond
certain access size and we have no control over userspace
access size of /dev/fb which can be backed by stolen memory.
So disable stolen memory backed fb by setting i915->dsm.usable_size
to zero.

v2: remove hsdes reference and fix commit message(Andi)
v3: use revid as we want to target SOC stepping(Radhakrishna)

Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230404181342.23362-1-nirmoy.das@intel.com
This commit is contained in:
Nirmoy Das 2023-04-04 20:13:42 +02:00
parent ea68a3e9d1
commit b90b044c64
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/gem/i915_gem_stolen.c
View File

@ -535,6 +535,14 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)
/* Basic memrange allocator for stolen space. */
drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size);
/*
* Access to stolen lmem beyond certain size for MTL A0 stepping
* would crash the machine. Disable stolen lmem for userspace access
* by setting usable_size to zero.
*/
if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0)
i915->dsm.usable_size = 0;
return 0;
}