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drm/i915: clear the gpu reloc batch

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commit 641382e9b44fba81a0778e1914ee35b8471121f9 upstream.

The reloc batch is short lived but can exist in the user visible ppGTT,
and since it's backed by an internal object, which lacks page clearing,
we should take care to clear it upfront.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201224151358.401345-2-matthew.auld@intel.com
Cc: stable@vger.kernel.org
(cherry picked from commit 26ebc511e799f621357982ccc37a7987a56a00f4)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthew Auld 2020-12-24 15:13:58 +00:00 committed by Greg Kroah-Hartman
parent 13738d7d5a
commit 36d366ace1
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
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@ -1046,7 +1046,7 @@ static void reloc_gpu_flush(struct i915_execbuffer *eb, struct reloc_cache *cach
GEM_BUG_ON(cache->rq_size >= obj->base.size / sizeof(u32));
cache->rq_cmd[cache->rq_size] = MI_BATCH_BUFFER_END;
__i915_gem_object_flush_map(obj, 0, sizeof(u32) * (cache->rq_size + 1));
i915_gem_object_flush_map(obj);
i915_gem_object_unpin_map(obj);
intel_gt_chipset_flush(cache->rq->engine->gt);
@ -1296,6 +1296,8 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
goto err_pool;
}
memset32(cmd, 0, pool->obj->base.size / sizeof(u32));
batch = i915_vma_instance(pool->obj, vma->vm, NULL);
if (IS_ERR(batch)) {
err = PTR_ERR(batch);