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drm/i915: Avoid div-by-zero on gen2 

commit 4819d16d91 upstream.

Gen2 tiles are 2KiB in size so i915_gem_object_get_tile_row_size()
can in fact return <4KiB, which leads to div-by-zero here.
Avoid that.

Not sure i915_gem_object_get_tile_row_size() is entirely
sane anyway since it doesn't account for the different tile
layouts on i8xx/i915...

I'm not able to hit this before commit 6846895fde ("drm/i915:
Replace PIN_NONFAULT with calls to PIN_NOEVICT") and it looks
like I also need to run recent version of Mesa. With those in
place xonotic trips on this quite easily on my 85x.

Cc: stable@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210421153401.13847-2-ville.syrjala@linux.intel.com
(cherry picked from commit ed52c62d386f764194e0184fdb905d5f24194cae)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/345/head^2
Ville Syrjälä 2021-04-21 18:33:58 +03:00 committed by Greg Kroah-Hartman
parent 86cd607215
commit 970c978d05
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/gem/i915_gem_mman.c
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@ -189,7 +189,7 @@ compute_partial_view(const struct drm_i915_gem_object *obj,
struct i915_ggtt_view view;
if (i915_gem_object_is_tiled(obj))
chunk = roundup(chunk, tile_row_pages(obj));
chunk = roundup(chunk, tile_row_pages(obj) ?: 1);
view.type = I915_GGTT_VIEW_PARTIAL;
view.partial.offset = rounddown(page_offset, chunk);