implemented context submission pvmmio optimizaiton with GVTg. GVTg to read context submission data (elsp_data) from the shared_page directly without trap cost to improve guest GPU peformrnace.
v1: rebase v0: RFC Signed-off-by: Xiaolin Zhang <[email protected]> --- drivers/gpu/drm/i915/gvt/handlers.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c index 42dfe03..63d1597 100644 --- a/drivers/gpu/drm/i915/gvt/handlers.c +++ b/drivers/gpu/drm/i915/gvt/handlers.c @@ -1667,6 +1667,8 @@ static int elsp_mmio_write(struct intel_vgpu *vgpu, unsigned int offset, int ring_id = intel_gvt_render_mmio_to_ring_id(vgpu->gvt, offset); struct intel_vgpu_execlist *execlist; u32 data = *(u32 *)p_data; + u32 elsp_data[4]; + u32 elsp_data_off; int ret = 0; if (WARN_ON(ring_id < 0 || ring_id >= I915_NUM_ENGINES)) @@ -1674,6 +1676,16 @@ static int elsp_mmio_write(struct intel_vgpu *vgpu, unsigned int offset, execlist = &vgpu->submission.execlist[ring_id]; + if (VGPU_PVMMIO(vgpu) & PVMMIO_ELSP_SUBMIT) { + elsp_data_off = offsetof(struct gvt_shared_page, elsp_data); + intel_gvt_read_shared_page(vgpu, elsp_data_off, &elsp_data, 16); + execlist->elsp_dwords.data[3] = elsp_data[0]; + execlist->elsp_dwords.data[2] = elsp_data[1]; + execlist->elsp_dwords.data[1] = elsp_data[2]; + execlist->elsp_dwords.data[0] = data; + return intel_vgpu_submit_execlist(vgpu, ring_id); + } + execlist->elsp_dwords.data[3 - execlist->elsp_dwords.index] = data; if (execlist->elsp_dwords.index == 3) { ret = intel_vgpu_submit_execlist(vgpu, ring_id); -- 2.7.4 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
