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drm/i915: clear the gpu reloc batch 

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
This commit is contained in:
Matthew Auld 2020-12-24 15:13:58 +00:00 committed by Chris Wilson
parent eeb52ee6c4
commit 26ebc511e7
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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@ -1045,7 +1045,7 @@ 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);
@ -1295,6 +1295,8 @@ 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);