anv: destroy descriptor sets when pool gets destroyed

Patch maintains a list of sets in the pool and destroys possible
remaining sets when pool is destroyed.

As stated in Vulkan spec:
   "When a pool is destroyed, all descriptor sets allocated from
    the pool are implicitly freed and become invalid."

This fixes memory leaks spotted with valgrind:

   ==19622== 96 bytes in 1 blocks are definitely lost in loss record 2 of 3
   ==19622==    at 0x483880B: malloc (vg_replace_malloc.c:309)
   ==19622==    by 0x495B67E: default_alloc_func (anv_device.c:547)
   ==19622==    by 0x4955E05: vk_alloc (vk_alloc.h:36)
   ==19622==    by 0x4956A8F: anv_multialloc_alloc (anv_private.h:538)
   ==19622==    by 0x4956A8F: anv_CreateDescriptorSetLayout (anv_descriptor_set.c:217)

Fixes: 14f6275c92 ("anv/descriptor_set: add reference counting for descriptor set layouts")
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/anv_descriptor_set.c

@@ -584,6 +584,8 @@ VkResult anv_CreateDescriptorPool(
                          &device->surface_state_pool, 4096);
    pool->surface_state_free_list = NULL;
 
+   list_inithead(&pool->desc_sets);
+
    *pDescriptorPool = anv_descriptor_pool_to_handle(pool);
 
    return VK_SUCCESS;
@@ -606,6 +608,12 @@ void anv_DestroyDescriptorPool(
       anv_gem_close(device, pool->bo.gem_handle);
    }
    anv_state_stream_finish(&pool->surface_state_stream);
+
+   list_for_each_entry_safe(struct anv_descriptor_set, set,
+                            &pool->desc_sets, pool_link) {
+      anv_descriptor_set_destroy(device, pool, set);
+   }
+
    vk_free2(&device->alloc, pAllocator, pool);
 }
 
@@ -682,6 +690,8 @@ anv_descriptor_pool_free_set(struct anv_descriptor_pool *pool,
       entry->size = set->size;
       pool->free_list = (char *) entry - pool->data;
    }
+
+   list_del(&set->pool_link);
 }
 
 struct surface_state_free_list_entry {
@@ -852,6 +862,8 @@ VkResult anv_AllocateDescriptorSets(
       if (result != VK_SUCCESS)
          break;
 
+      list_addtail(&set->pool_link, &pool->desc_sets);
+
       pDescriptorSets[i] = anv_descriptor_set_to_handle(set);
    }
 

src/intel/vulkan/anv_private.h

@@ -1629,6 +1629,10 @@ struct anv_descriptor_set {
 
    uint32_t buffer_view_count;
    struct anv_buffer_view *buffer_views;
+
+   /* Link to descriptor pool's desc_sets list . */
+   struct list_head pool_link;
+
    struct anv_descriptor descriptors[0];
 };
 
@@ -1671,6 +1675,8 @@ struct anv_descriptor_pool {
    struct anv_state_stream surface_state_stream;
    void *surface_state_free_list;
 
+   struct list_head desc_sets;
+
    char data[0];
 };