[PATCH v3 0/3] Fix resource freeing bugs in virtio-gpu-rutabaga

[Manos Pitsidianakis <manos.pitsidianakis@linaro.org>]

While testing the rutabaga gpu device, we noticed that if the device is
reset, it stops working and complains about missing resource ids. A
quick investigation discovered that the generic VirtIOGPU implementation
frees all resources, but for Rutabaga, they are tied with rutabaga
objects that need to be destroyed as well.

This series adds a resource_destroy class method that the Rutabaga
device can override and do its own bookkeeping.

v2 -> v3 differences:
- use error_setg_errno in virtio-gpu-rutabaga.c
  resource_destroy method. (Thanks Marc-André
  Lureau <marcandre.lureau@gmail.com> !)

v1 -> v2 differences:
- addressed review comments re: using the Error API for the
  resource_destroy method.

Manos Pitsidianakis (3):
  hw/display/virtio-gpu.c: use reset_bh class method
  virtio-gpu.c: add resource_destroy class method
  virtio-gpu-rutabaga.c: override resource_destroy method

 include/hw/virtio/virtio-gpu.h   |  3 ++
 hw/display/virtio-gpu-rutabaga.c | 47 ++++++++++++++++++++++++--------
 hw/display/virtio-gpu.c          | 27 +++++++++++++++---
 3 files changed, 61 insertions(+), 16 deletions(-)

Range-diff against v2:
1:  5893fb45d1 = 1:  87fb4fa72c hw/display/virtio-gpu.c: use reset_bh class method
2:  78b15e8f7e ! 2:  b0a86630c4 virtio-gpu.c: add resource_destroy class method
    @@ Commit message
         This commit adds a class method so that virtio-gpu-rutabaga can override
         it in the next commit.
     
    +    Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
         Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
     
      ## include/hw/virtio/virtio-gpu.h ##
3:  926db899be ! 3:  e3778e44c9 virtio-gpu-rutabaga.c: override resource_destroy method
    @@ hw/display/virtio-gpu-rutabaga.c: rutabaga_cmd_create_resource_3d(VirtIOGPU *g,
     +                                   Error **errp)
     +{
     +    int32_t result;
    -+    const char *strerror = NULL;
     +    VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g);
     +
     +    result = rutabaga_resource_unref(vr->rutabaga, res->resource_id);
     +    if (result) {
    -+        error_setg(errp, "%s: rutabaga_resource_unref returned %"PRIi32
    -+                   " for resource_id = %"PRIu32, __func__, result,
    -+                   res->resource_id);
    -+        strerror = strerrorname_np((int)result);
    -+        if (strerror != NULL) {
    -+            error_append_hint(errp, "%s: %s\n",
    -+                              strerror, strerrordesc_np((int)result) ? : "");
    -+        }
    ++        error_setg_errno(errp,
    ++                        (int)result,
    ++                        "%s: rutabaga_resource_unref returned %"PRIi32
    ++                        " for resource_id = %"PRIu32, __func__, result,
    ++                        res->resource_id);
     +    }
     +
     +    if (res->image) {

base-commit: 11be70677c70fdccd452a3233653949b79e97908
-- 
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