pan/decode: Free mapped memory objects on BO unreference

Cc: mesa-stable
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8583>
(cherry picked from commit 0d0536c1a7)

.pick_status.json

@@ -1084,7 +1084,7 @@
         "description": "pan/decode: Free mapped memory objects on BO unreference",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": null
     },

src/panfrost/lib/decode_common.c

@@ -117,6 +117,24 @@ pandecode_inject_mmap(uint64_t gpu_va, void *cpu, unsigned sz, const char *name)
                 _mesa_hash_table_u64_insert(mmap_table, gpu_va + i, mapped_mem);
 }
 
+void
+pandecode_inject_free(uint64_t gpu_va, unsigned sz)
+{
+        struct pandecode_mapped_memory *mem =
+                pandecode_find_mapped_gpu_mem_containing_rw(gpu_va);
+
+        if (!mem)
+                return;
+
+        assert(mem->gpu_va == gpu_va);
+        assert(mem->length == sz);
+
+        free(mem);
+
+        for (unsigned i = 0; i < sz; i += 4096)
+                _mesa_hash_table_u64_remove(mmap_table, gpu_va + i);
+}
+
 char *
 pointer_as_memory_reference(uint64_t ptr)
 {

src/panfrost/lib/pan_bo.c

@@ -436,6 +436,9 @@ panfrost_bo_unreference(struct panfrost_bo *bo)
                 /* When the reference count goes to zero, we need to cleanup */
                 panfrost_bo_munmap(bo);
 
+                if (dev->debug & (PAN_DBG_TRACE | PAN_DBG_SYNC))
+                        pandecode_inject_free(bo->ptr.gpu, bo->size);
+
                 /* Rather than freeing the BO now, we'll cache the BO for later
                  * allocations if we're allowed to.
                  */

src/panfrost/lib/wrap.h

@@ -51,6 +51,8 @@ void pandecode_close(void);
 void
 pandecode_inject_mmap(uint64_t gpu_va, void *cpu, unsigned sz, const char *name);
 
+void pandecode_inject_free(uint64_t gpu_va, unsigned sz);
+
 void pandecode_jc(uint64_t jc_gpu_va, bool bifrost, unsigned gpu_id, bool minimal);
 
 #endif /* __MMAP_TRACE_H__ */