anv: Delay allocation of relocation lists

The old relocation list code always allocated 256 relocations and a hash
set up-front without knowing whether or not we really need them.  In
particular, in the softpin case, this is two fairly large allocations
that we don't need to be making.  Also, for pipeline objects on haswell
where we don't have softpin, we don't need relocations unless scratch is
used so this is extra data per-pipeline.  Instead, we should do it
on-demand.  This shaves 3.5% off of a cpu-limited example running with
the Dawn WebGPU implementation.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_batch_chain.c

@@ -46,70 +46,68 @@
  * Functions related to anv_reloc_list
  *-----------------------------------------------------------------------*/
 
+VkResult
+anv_reloc_list_init(struct anv_reloc_list *list,
+                    const VkAllocationCallbacks *alloc)
+{
+   memset(list, 0, sizeof(*list));
+   return VK_SUCCESS;
+}
+
 static VkResult
 anv_reloc_list_init_clone(struct anv_reloc_list *list,
                           const VkAllocationCallbacks *alloc,
                           const struct anv_reloc_list *other_list)
 {
-   if (other_list) {
-      list->num_relocs = other_list->num_relocs;
-      list->array_length = other_list->array_length;
-   } else {
-      list->num_relocs = 0;
-      list->array_length = 256;
-   }
-
-   list->relocs =
-      vk_alloc(alloc, list->array_length * sizeof(*list->relocs), 8,
-                VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
-
-   if (list->relocs == NULL)
-      return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
-
-   list->reloc_bos =
-      vk_alloc(alloc, list->array_length * sizeof(*list->reloc_bos), 8,
-                VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
-
-   if (list->reloc_bos == NULL) {
-      vk_free(alloc, list->relocs);
-      return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
-   }
-
-   list->deps = _mesa_pointer_set_create(NULL);
+   list->num_relocs = other_list->num_relocs;
+   list->array_length = other_list->array_length;
+
+   if (list->num_relocs > 0) {
+      list->relocs =
+         vk_alloc(alloc, list->array_length * sizeof(*list->relocs), 8,
+                   VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+      if (list->relocs == NULL)
+         return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
 
-   if (!list->deps) {
-      vk_free(alloc, list->relocs);
-      vk_free(alloc, list->reloc_bos);
-      return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
-   }
+      list->reloc_bos =
+         vk_alloc(alloc, list->array_length * sizeof(*list->reloc_bos), 8,
+                   VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+      if (list->reloc_bos == NULL) {
+         vk_free(alloc, list->relocs);
+         return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
+      }
 
-   if (other_list) {
       memcpy(list->relocs, other_list->relocs,
              list->array_length * sizeof(*list->relocs));
       memcpy(list->reloc_bos, other_list->reloc_bos,
              list->array_length * sizeof(*list->reloc_bos));
-      set_foreach(other_list->deps, entry) {
-         _mesa_set_add_pre_hashed(list->deps, entry->hash, entry->key);
+   } else {
+      list->relocs = NULL;
+      list->reloc_bos = NULL;
+   }
+
+   if (other_list->deps) {
+      list->deps = _mesa_set_clone(other_list->deps, NULL);
+      if (!list->deps) {
+         vk_free(alloc, list->relocs);
+         vk_free(alloc, list->reloc_bos);
+         return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
       }
+   } else {
+      list->deps = NULL;
    }
 
    return VK_SUCCESS;
 }
 
-VkResult
-anv_reloc_list_init(struct anv_reloc_list *list,
-                    const VkAllocationCallbacks *alloc)
-{
-   return anv_reloc_list_init_clone(list, alloc, NULL);
-}
-
 void
 anv_reloc_list_finish(struct anv_reloc_list *list,
                       const VkAllocationCallbacks *alloc)
 {
    vk_free(alloc, list->relocs);
    vk_free(alloc, list->reloc_bos);
-   _mesa_set_destroy(list->deps, NULL);
+   if (list->deps != NULL)
+      _mesa_set_destroy(list->deps, NULL);
 }
 
 static VkResult
@@ -120,34 +118,27 @@ anv_reloc_list_grow(struct anv_reloc_list *list,
    if (list->num_relocs + num_additional_relocs <= list->array_length)
       return VK_SUCCESS;
 
-   size_t new_length = list->array_length * 2;
+   size_t new_length = MAX2(256, list->array_length * 2);
    while (new_length < list->num_relocs + num_additional_relocs)
       new_length *= 2;
 
    struct drm_i915_gem_relocation_entry *new_relocs =
-      vk_alloc(alloc, new_length * sizeof(*list->relocs), 8,
-                VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+      vk_realloc(alloc, list->relocs,
+                 new_length * sizeof(*list->relocs), 8,
+                 VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
    if (new_relocs == NULL)
       return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
+   list->relocs = new_relocs;
 
    struct anv_bo **new_reloc_bos =
-      vk_alloc(alloc, new_length * sizeof(*list->reloc_bos), 8,
-                VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
-   if (new_reloc_bos == NULL) {
-      vk_free(alloc, new_relocs);
+      vk_realloc(alloc, list->reloc_bos,
+                 new_length * sizeof(*list->reloc_bos), 8,
+                 VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+   if (new_reloc_bos == NULL)
       return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
-   }
-
-   memcpy(new_relocs, list->relocs, list->num_relocs * sizeof(*list->relocs));
-   memcpy(new_reloc_bos, list->reloc_bos,
-          list->num_relocs * sizeof(*list->reloc_bos));
-
-   vk_free(alloc, list->relocs);
-   vk_free(alloc, list->reloc_bos);
+   list->reloc_bos = new_reloc_bos;
 
    list->array_length = new_length;
-   list->relocs = new_relocs;
-   list->reloc_bos = new_reloc_bos;
 
    return VK_SUCCESS;
 }
@@ -161,6 +152,11 @@ anv_reloc_list_add(struct anv_reloc_list *list,
    int index;
 
    if (target_bo->flags & EXEC_OBJECT_PINNED) {
+      if (list->deps == NULL) {
+         list->deps = _mesa_pointer_set_create(NULL);
+         if (unlikely(list->deps == NULL))
+            return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
+      }
       _mesa_set_add(list->deps, target_bo);
       return VK_SUCCESS;
    }
@@ -193,18 +189,26 @@ anv_reloc_list_append(struct anv_reloc_list *list,
    if (result != VK_SUCCESS)
       return result;
 
-   memcpy(&list->relocs[list->num_relocs], &other->relocs[0],
-          other->num_relocs * sizeof(other->relocs[0]));
-   memcpy(&list->reloc_bos[list->num_relocs], &other->reloc_bos[0],
-          other->num_relocs * sizeof(other->reloc_bos[0]));
+   if (other->num_relocs > 0) {
+      memcpy(&list->relocs[list->num_relocs], &other->relocs[0],
+             other->num_relocs * sizeof(other->relocs[0]));
+      memcpy(&list->reloc_bos[list->num_relocs], &other->reloc_bos[0],
+             other->num_relocs * sizeof(other->reloc_bos[0]));
 
-   for (uint32_t i = 0; i < other->num_relocs; i++)
-      list->relocs[i + list->num_relocs].offset += offset;
+      for (uint32_t i = 0; i < other->num_relocs; i++)
+         list->relocs[i + list->num_relocs].offset += offset;
 
-   list->num_relocs += other->num_relocs;
+      list->num_relocs += other->num_relocs;
+   }
 
-   set_foreach(other->deps, entry) {
-      _mesa_set_add_pre_hashed(list->deps, entry->hash, entry->key);
+   if (other->deps) {
+      if (list->deps == NULL) {
+         list->deps = _mesa_pointer_set_create(NULL);
+         if (unlikely(list->deps == NULL))
+            return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
+      }
+      set_foreach(other->deps, entry)
+         _mesa_set_add_pre_hashed(list->deps, entry->hash, entry->key);
    }
 
    return VK_SUCCESS;