1 files changed, 42 insertions, 52 deletions

diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index e88970256e8e..b0899b665e85 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -1166,7 +1166,7 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
 		}
 	}
 	if (IS_ERR(src)) {
-		unsigned long x, n;
+		unsigned long x, n, remain;
 		void *ptr;
 
 		/*
@@ -1177,14 +1177,15 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
 		 * We don't care about copying too much here as we only
 		 * validate up to the end of the batch.
 		 */
+		remain = length;
 		if (!(dst_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
-			length = round_up(length,
+			remain = round_up(remain,
 					  boot_cpu_data.x86_clflush_size);
 
 		ptr = dst;
 		x = offset_in_page(offset);
-		for (n = offset >> PAGE_SHIFT; length; n++) {
-			int len = min(length, PAGE_SIZE - x);
+		for (n = offset >> PAGE_SHIFT; remain; n++) {
+			int len = min(remain, PAGE_SIZE - x);
 
 			src = kmap_atomic(i915_gem_object_get_page(src_obj, n));
 			if (needs_clflush)
@@ -1193,13 +1194,15 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
 			kunmap_atomic(src);
 
 			ptr += len;
-			length -= len;
+			remain -= len;
 			x = 0;
 		}
 	}
 
 	i915_gem_object_unpin_pages(src_obj);
 
+	memset32(dst + length, 0, (dst_obj->base.size - length) / sizeof(u32));
+
 	/* dst_obj is returned with vmap pinned */
 	return dst;
 }
@@ -1392,11 +1395,6 @@ static unsigned long *alloc_whitelist(u32 batch_length)
 
 #define LENGTH_BIAS 2
 
-static bool shadow_needs_clflush(struct drm_i915_gem_object *obj)
-{
-	return !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
-}
-
 /**
  * intel_engine_cmd_parser() - parse a batch buffer for privilege violations
  * @engine: the engine on which the batch is to execute
@@ -1452,43 +1450,42 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
 	 * space. Parsing should be faster in some cases this way.
 	 */
 	batch_end = cmd + batch_length / sizeof(*batch_end);
-	do {
-		u32 length;
-
-		if (*cmd == MI_BATCH_BUFFER_END)
-			break;
-
-		desc = find_cmd(engine, *cmd, desc, &default_desc);
-		if (!desc) {
-			DRM_DEBUG("CMD: Unrecognized command: 0x%08X\n", *cmd);
-			ret = -EINVAL;
-			break;
-		}
+	while (*cmd != MI_BATCH_BUFFER_END) {
+		u32 length = 1;
+
+		if (*cmd != MI_NOOP) { /* MI_NOOP == 0 */
+			desc = find_cmd(engine, *cmd, desc, &default_desc);
+			if (!desc) {
+				DRM_DEBUG("CMD: Unrecognized command: 0x%08X\n", *cmd);
+				ret = -EINVAL;
+				break;
+			}
 
-		if (desc->flags & CMD_DESC_FIXED)
-			length = desc->length.fixed;
-		else
-			length = (*cmd & desc->length.mask) + LENGTH_BIAS;
+			if (desc->flags & CMD_DESC_FIXED)
+				length = desc->length.fixed;
+			else
+				length = (*cmd & desc->length.mask) + LENGTH_BIAS;
 
-		if ((batch_end - cmd) < length) {
-			DRM_DEBUG("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n",
-				  *cmd,
-				  length,
-				  batch_end - cmd);
-			ret = -EINVAL;
-			break;
-		}
+			if ((batch_end - cmd) < length) {
+				DRM_DEBUG("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n",
+					  *cmd,
+					  length,
+					  batch_end - cmd);
+				ret = -EINVAL;
+				break;
+			}
 
-		if (!check_cmd(engine, desc, cmd, length)) {
-			ret = -EACCES;
-			break;
-		}
+			if (!check_cmd(engine, desc, cmd, length)) {
+				ret = -EACCES;
+				break;
+			}
 
-		if (cmd_desc_is(desc, MI_BATCH_BUFFER_START)) {
-			ret = check_bbstart(cmd, offset, length, batch_length,
-					    batch_addr, shadow_addr,
-					    jump_whitelist);
-			break;
+			if (cmd_desc_is(desc, MI_BATCH_BUFFER_START)) {
+				ret = check_bbstart(cmd, offset, length, batch_length,
+						    batch_addr, shadow_addr,
+						    jump_whitelist);
+				break;
+			}
 		}
 
 		if (!IS_ERR_OR_NULL(jump_whitelist))
@@ -1501,7 +1498,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
 			ret = -EINVAL;
 			break;
 		}
-	} while (1);
+	}
 
 	if (trampoline) {
 		/*
@@ -1539,16 +1536,9 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
 				ret = 0; /* allow execution */
 			}
 		}
-
-		if (shadow_needs_clflush(shadow->obj))
-			drm_clflush_virt_range(batch_end, 8);
 	}
 
-	if (shadow_needs_clflush(shadow->obj)) {
-		void *ptr = page_mask_bits(shadow->obj->mm.mapping);
-
-		drm_clflush_virt_range(ptr, (void *)(cmd + 1) - ptr);
-	}
+	i915_gem_object_flush_map(shadow->obj);
 
 	if (!IS_ERR_OR_NULL(jump_whitelist))
 		kfree(jump_whitelist);