drm: VIRGL ctx attach/detach, full atomic ioctl parser, code readability
Gap 11 (CTX_ATTACH/DETACH_RESOURCE):
- Add virgl_ctx_attach_resource + virgl_ctx_detach_resource
to GpuDriver trait with default Unsupported fallbacks
- Implement ctx_attach_resource + ctx_detach_resource on
VirtioGpuDevice using existing VirtioGpuCtxResource wire struct
- Wire both into VirtioDriver GpuDriver impl with has_virgl_3d gating
- Binds 3D resources to GL contexts for subsequent SUBMIT_3D calls
Gap 12 (Atomic ioctl full parser):
- Parse drm_mode_atomic header: flags, count_objs, objs_ptr,
count_props_ptr, props_ptr, prop_values_ptr
- Read object ID array and per-object property arrays from
inline payload offsets
- Detect CRTC objects and extract FB_ID, MODE_ID, ACTIVE props
- Build AtomicState with CRTC mode+fb configurations
- Support TEST_ONLY, NONBLOCK, ALLOW_MODESET flags
- Add DRM_MODE_ATOMIC_ALLOW_MODESET constant (0x0400)
- Add read_u64() helper for 64-bit property values
Code readability:
- Module-level documentation for VirtioDriver struct
- Lock-ordering constraint comment on virgl_resource_create_blob
- poll_hotplug purpose explanation (compositor polling vs IRQ)
- atomic_commit dispatch comment (validate then delegate)
vasilito
a17dccf3dc