venus: add error log coverage for virtgpu backend

Make life easier for ci debug, remote debug, and any kind of bug report
inspection. Long need to add this.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38443>

src/virtio/vulkan/vn_renderer_virtgpu.c

@@ -646,8 +646,13 @@ virtgpu_ioctl_resource_create_blob(struct virtgpu *gpu,
       .blob_id = blob_id,
    };
 
-   if (virtgpu_ioctl(gpu, DRM_IOCTL_VIRTGPU_RESOURCE_CREATE_BLOB, &args))
+   if (virtgpu_ioctl(gpu, DRM_IOCTL_VIRTGPU_RESOURCE_CREATE_BLOB, &args)) {
+      vn_log(gpu->instance,
+             "RESOURCE_CREATE_BLOB failed: type=%u, flags=%u, size=%zu, "
+             "id=%" PRIu64 ", err=%s",
+             blob_mem, blob_flags, blob_size, blob_id, strerror(errno));
       return 0;
+   }
 
    *res_id = args.res_handle;
    return args.bo_handle;
@@ -662,7 +667,14 @@ virtgpu_ioctl_resource_info(struct virtgpu *gpu,
       .bo_handle = gem_handle,
    };
 
-   return virtgpu_ioctl(gpu, DRM_IOCTL_VIRTGPU_RESOURCE_INFO, info);
+   const int ret = virtgpu_ioctl(gpu, DRM_IOCTL_VIRTGPU_RESOURCE_INFO, info);
+   if (ret) {
+      vn_log(gpu->instance, "RESOURCE_INFO failed: handle=%u, err=%s",
+             gem_handle, strerror(errno));
+      return ret;
+   }
+
+   return 0;
 }
 
 static void
@@ -687,7 +699,14 @@ virtgpu_ioctl_prime_handle_to_fd(struct virtgpu *gpu,
    };
 
    const int ret = virtgpu_ioctl(gpu, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
-   return ret ? -1 : args.fd;
+   if (ret) {
+      vn_log(gpu->instance,
+             "PRIME_HANDLE_TO_FD failed: handle=%u, mappable=%d, err=%s",
+             gem_handle, mappable, strerror(errno));
+      return -1;
+   }
+
+   return args.fd;
 }
 
 static uint32_t
@@ -698,7 +717,13 @@ virtgpu_ioctl_prime_fd_to_handle(struct virtgpu *gpu, int fd)
    };
 
    const int ret = virtgpu_ioctl(gpu, DRM_IOCTL_PRIME_FD_TO_HANDLE, &args);
-   return ret ? 0 : args.handle;
+   if (ret) {
+      vn_log(gpu->instance, "PRIME_FD_TO_HANDLE failed: fd=%d, err=%s", fd,
+             strerror(errno));
+      return 0;
+   }
+
+   return args.handle;
 }
 
 static void *
@@ -708,13 +733,21 @@ virtgpu_ioctl_map(struct virtgpu *gpu, uint32_t gem_handle, size_t size)
       .handle = gem_handle,
    };
 
-   if (virtgpu_ioctl(gpu, DRM_IOCTL_VIRTGPU_MAP, &args))
+   if (virtgpu_ioctl(gpu, DRM_IOCTL_VIRTGPU_MAP, &args)) {
+      vn_log(gpu->instance, "MAP failed: handle=%u, err=%s", gem_handle,
+             strerror(errno));
       return NULL;
+   }
 
    void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, gpu->fd,
                     args.offset);
-   if (ptr == MAP_FAILED)
+   if (ptr == MAP_FAILED) {
+      vn_log(
+         gpu->instance,
+         "mmap failed: gpu_fd=%d, handle=%u, size=%zu, offset=%llu, err=%s",
+         gpu->fd, gem_handle, size, args.offset, strerror(errno));
       return NULL;
+   }
 
    return ptr;
 }
@@ -1179,8 +1212,13 @@ virtgpu_bo_create_from_dma_buf(struct vn_renderer *renderer,
    size_t mmap_size = 0;
    if (info.blob_mem) {
       /* must be VIRTGPU_BLOB_MEM_HOST3D or VIRTGPU_BLOB_MEM_GUEST_VRAM */
-      if (info.blob_mem != gpu->bo_blob_mem)
+      if (info.blob_mem != gpu->bo_blob_mem) {
+         vn_log(gpu->instance,
+                "dma-buf import failed: info.blob_mem(%u) != "
+                "gpu->bo_blob_mem(%u)",
+                info.blob_mem, gpu->bo_blob_mem);
          goto fail;
+      }
 
       blob_flags |= virtgpu_bo_blob_flags(gpu, flags, 0);
 
@@ -1208,10 +1246,19 @@ virtgpu_bo_create_from_dma_buf(struct vn_renderer *renderer,
     * might only be memset to 0 and is not considered initialized in theory
     */
    if (bo->gem_handle == gem_handle) {
-      if (bo->base.mmap_size < mmap_size)
+      if (bo->base.mmap_size < mmap_size) {
+         vn_log(
+            gpu->instance,
+            "dma-buf import failed: bo->base.mmap_size(%zu) < mmap_size(%zu)",
+            bo->base.mmap_size, mmap_size);
          goto fail;
-      if (blob_flags & ~bo->blob_flags)
+      }
+      if (blob_flags & ~bo->blob_flags) {
+         vn_log(gpu->instance,
+                "dma-buf import failed: blob_flags(%u) & ~bo->blob_flags(%u)",
+                blob_flags, bo->blob_flags);
          goto fail;
+      }
 
       /* we can't use vn_renderer_bo_ref as the refcount may drop to 0
        * temporarily before virtgpu_bo_destroy grabs the lock
@@ -1278,6 +1325,10 @@ virtgpu_bo_create_from_device_memory(
       assert(info.blob_mem);
       if (info.size < size) {
          virtgpu_ioctl_gem_close(gpu, gem_handle);
+
+         vn_log(gpu->instance,
+                "blob mem create failed: info.size(%u) < size(%" PRIu64 ")",
+                info.size, size);
          return VK_ERROR_INVALID_EXTERNAL_HANDLE;
       }