winsys/amdgpu: Close KMS handles for other DRM file descriptions

When a BO or amdgpu_screen_winsys is destroyed.

Should fix leaking such BOs in other DRM file descriptions.

v2:
* Pass the correct file descriptor to drmIoctl (Pierre-Eric
  Pelloux-Prayer)
* Use _mesa_hash_table_remove
v3:
* Close handles in amdgpu_winsys_unref as well
v4:
* Adapt to amdgpu_winsys::sws_list_lock.

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2270
Fixes: 11a3679e3aba "winsys/amdgpu: Make KMS handles valid for original
                     DRM file descriptor"

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
(Cherry picked from commit ca6a22305b275b49fbc88b8f4cba2fefb24c2a5d)

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3693>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3693>

2 files changed, 21 insertions, 3 deletions

diff --git a/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c b/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
index 66ccfc89ab5..bd8f055ea2c 100644
--- a/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
+++ b/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
@@ -183,10 +183,21 @@ void amdgpu_bo_destroy(struct pb_buffer *_buf)
       simple_mtx_unlock(&ws->global_bo_list_lock);
    }
 
+   /* Close all KMS handles retrieved for other DRM file descriptions */
    simple_mtx_lock(&ws->sws_list_lock);
    for (sws_iter = ws->sws_list; sws_iter; sws_iter = sws_iter->next) {
-      if (sws_iter->kms_handles)
-         _mesa_hash_table_remove_key(sws_iter->kms_handles, bo);
+      struct hash_entry *entry;
+
+      if (!sws_iter->kms_handles)
+         continue;
+
+      entry = _mesa_hash_table_search(sws_iter->kms_handles, bo);
+      if (entry) {
+         struct drm_gem_close args = { .handle = (uintptr_t)entry->data };
+
+         drmIoctl(sws_iter->fd, DRM_IOCTL_GEM_CLOSE, &args);
+         _mesa_hash_table_remove(sws_iter->kms_handles, entry);
+      }
    }
    simple_mtx_unlock(&ws->sws_list_lock);
 
diff --git a/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c b/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c
index 89d3d93bb5f..4bbd50664ba 100644
--- a/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c
+++ b/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c
@@ -304,8 +304,15 @@ static bool amdgpu_winsys_unref(struct radeon_winsys *rws)
 
    simple_mtx_unlock(&aws->sws_list_lock);
 
-   if (ret && sws->kms_handles)
+   if (ret && sws->kms_handles) {
+      struct drm_gem_close args;
+
+      hash_table_foreach(sws->kms_handles, entry) {
+         args.handle = (uintptr_t)entry->data;
+         drmIoctl(sws->fd, DRM_IOCTL_GEM_CLOSE, &args);
+      }
       _mesa_hash_table_destroy(sws->kms_handles, NULL);
+   }
 
    return ret;
 }