From e21fd552ff068da4bcb1a0108e2933db52685f2c Mon Sep 17 00:00:00 2001 From: Yu Zhang Date: Tue, 10 Feb 2015 19:05:51 +0800 Subject: [PATCH] drm/i915: Add the display switch logic for vGPU in i915 driver Display switch logic is added to notify the host side that current vGPU have a valid surface to show. It does so by writing the display_ready field in PV INFO page, and then will be handled in the host side. This is useful to avoid trickiness when the VM's framebuffer is being accessed in the middle of VM modesetting, e.g. compositing the framebuffer in the host side. v2: - move the notification code outside the 'else' in load sequence - remove the notification code in intel_crtc_set_config() v4: - code rebase, no need to define another dev_priv - use #define instead of enum for display readiness Signed-off-by: Yu Zhang Signed-off-by: Jike Song Signed-off-by: Zhiyuan Lv Reviewed-by: Tvrtko Ursulin Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_dma.c | 8 ++++++++ drivers/gpu/drm/i915/i915_vgpu.h | 4 ++++ 2 files changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 1a46787129e7..5804aa5f9df0 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -36,6 +36,7 @@ #include "intel_drv.h" #include #include "i915_drv.h" +#include "i915_vgpu.h" #include "i915_trace.h" #include #include @@ -842,6 +843,13 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) } } + /* + * Notify a valid surface after modesetting, + * when running inside a VM. + */ + if (intel_vgpu_active(dev)) + I915_WRITE(vgtif_reg(display_ready), VGT_DRV_DISPLAY_READY); + i915_setup_sysfs(dev); if (INTEL_INFO(dev)->num_pipes) { diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h index 3ed01a7ac48e..0db9ccf32605 100644 --- a/drivers/gpu/drm/i915/i915_vgpu.h +++ b/drivers/gpu/drm/i915/i915_vgpu.h @@ -80,6 +80,10 @@ struct vgt_if { #define vgtif_reg(x) \ (VGT_PVINFO_PAGE + (long)&((struct vgt_if *)NULL)->x) +/* vGPU display status to be used by the host side */ +#define VGT_DRV_DISPLAY_NOT_READY 0 +#define VGT_DRV_DISPLAY_READY 1 /* ready for display switch */ + extern void i915_check_vgpu(struct drm_device *dev); extern int intel_vgt_balloon(struct drm_device *dev); extern void intel_vgt_deballoon(void); -- 2.39.5