anv/allocator: Add support for "back" allocations to state_pool

Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com>

src/intel/vulkan/anv_allocator.c

@@ -644,6 +644,7 @@ anv_state_pool_init(struct anv_state_pool *pool,
    pool->block_pool = block_pool;
    assert(util_is_power_of_two(block_size));
    pool->block_size = block_size;
+   pool->back_alloc_free_list = ANV_FREE_LIST_EMPTY;
    for (unsigned i = 0; i < ANV_STATE_BUCKETS; i++) {
       pool->buckets[i].free_list = ANV_FREE_LIST_EMPTY;
       pool->buckets[i].block.next = 0;
@@ -727,6 +728,26 @@ anv_state_pool_alloc(struct anv_state_pool *pool, uint32_t size, uint32_t align)
    return state;
 }
 
+struct anv_state
+anv_state_pool_alloc_back(struct anv_state_pool *pool)
+{
+   struct anv_state state;
+   state.alloc_size = pool->block_size;
+
+   if (anv_free_list_pop(&pool->back_alloc_free_list,
+                         &pool->block_pool->map, &state.offset)) {
+      assert(state.offset < 0);
+      goto done;
+   }
+
+   state.offset = anv_block_pool_alloc_back(pool->block_pool, pool->block_size);
+
+done:
+   state.map = pool->block_pool->map + state.offset;
+   VG(VALGRIND_MEMPOOL_ALLOC(pool, state.map, state.alloc_size));
+   return state;
+}
+
 static void
 anv_state_pool_free_no_vg(struct anv_state_pool *pool, struct anv_state state)
 {
@@ -736,9 +757,15 @@ anv_state_pool_free_no_vg(struct anv_state_pool *pool, struct anv_state state)
           size_log2 <= ANV_MAX_STATE_SIZE_LOG2);
    unsigned bucket = size_log2 - ANV_MIN_STATE_SIZE_LOG2;
 
+   if (state.offset < 0) {
+      assert(state.alloc_size == pool->block_size);
+      anv_free_list_push(&pool->back_alloc_free_list,
+                         pool->block_pool->map, state.offset);
+   } else {
       anv_free_list_push(&pool->buckets[bucket].free_list,
                          pool->block_pool->map, state.offset);
    }
+}
 
 void
 anv_state_pool_free(struct anv_state_pool *pool, struct anv_state state)

src/intel/vulkan/anv_private.h

@@ -506,6 +506,9 @@ struct anv_state_pool {
    /* The size of blocks which will be allocated from the block pool */
    uint32_t block_size;
 
+   /** Free list for "back" allocations */
+   union anv_free_list back_alloc_free_list;
+
    struct anv_fixed_size_state_pool buckets[ANV_STATE_BUCKETS];
 };
 
@@ -571,6 +574,7 @@ void anv_state_pool_init(struct anv_state_pool *pool,
 void anv_state_pool_finish(struct anv_state_pool *pool);
 struct anv_state anv_state_pool_alloc(struct anv_state_pool *pool,
                                       uint32_t state_size, uint32_t alignment);
+struct anv_state anv_state_pool_alloc_back(struct anv_state_pool *pool);
 void anv_state_pool_free(struct anv_state_pool *pool, struct anv_state state);
 void anv_state_stream_init(struct anv_state_stream *stream,
                            struct anv_state_pool *state_pool,