| Message ID | 20250402-virtio-gpu-host-page-size-v2-2-0afdc8c16cb9@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm/virtio: introduce the HOST_PAGE_SIZE feature | expand |
On 4/2/25 20:46, Sergio Lopez wrote: > diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c > index c33c057365f85a2ace536f91655c903036827312..405203b3c3847a8b318a7118aa34356c839d249e 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c > +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c > @@ -117,6 +117,11 @@ static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data, > case VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME: > value = vgdev->has_context_init ? 1 : 0; > break; > + case VIRTGPU_PARAM_HOST_PAGE_SIZE: > + if (!vgdev->has_host_page_size) > + return -EINVAL; ENOENT
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c index c33c057365f85a2ace536f91655c903036827312..405203b3c3847a8b318a7118aa34356c839d249e 100644 --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c @@ -117,6 +117,11 @@ static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data, case VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME: value = vgdev->has_context_init ? 1 : 0; break; + case VIRTGPU_PARAM_HOST_PAGE_SIZE: + if (!vgdev->has_host_page_size) + return -EINVAL; + value = vgdev->host_page_size; + break; default: return -EINVAL; } diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h index c2ce71987e9bb816d13a300679336cb756f1cbcf..505f87263a15f55302d7134335bebd91ff4cdae3 100644 --- a/include/uapi/drm/virtgpu_drm.h +++ b/include/uapi/drm/virtgpu_drm.h @@ -98,6 +98,7 @@ struct drm_virtgpu_execbuffer { #define VIRTGPU_PARAM_CONTEXT_INIT 6 /* DRM_VIRTGPU_CONTEXT_INIT */ #define VIRTGPU_PARAM_SUPPORTED_CAPSET_IDs 7 /* Bitmask of supported capability set ids */ #define VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME 8 /* Ability to set debug name from userspace */ +#define VIRTGPU_PARAM_HOST_PAGE_SIZE 9 /* Host's page size */ struct drm_virtgpu_getparam { __u64 param;
Add VIRTGPU_PARAM_HOST_PAGE_SIZE as a param that can be read with VIRTGPU_GETPARAM by userspace applications running in the guest to obtain the host's page size and find out the right alignment to be used in shared memory allocations. Signed-off-by: Sergio Lopez <slp@redhat.com> --- drivers/gpu/drm/virtio/virtgpu_ioctl.c | 5 +++++ include/uapi/drm/virtgpu_drm.h | 1 + 2 files changed, 6 insertions(+)