drm/i915/gvt: add hotplug emulation

Add function to emulate hotplug interrupt for SKL/KBL platforms

Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
index 6a86fac..035479e 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/display.c
+++ b/drivers/gpu/drm/i915/gvt/display.c
@@ -446,6 +446,36 @@ void intel_gvt_emulate_vblank(struct intel_gvt *gvt)
 }
 
 /**
+ * intel_vgpu_emulate_hotplug - trigger hotplug event for vGPU
+ * @vgpu: a vGPU
+ * @conncted: link state
+ *
+ * This function is used to trigger hotplug interrupt for vGPU
+ *
+ */
+void intel_vgpu_emulate_hotplug(struct intel_vgpu *vgpu, bool connected)
+{
+       struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+
+       /* TODO: add more platforms support */
+       if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
+               if (connected) {
+                       vgpu_vreg_t(vgpu, SFUSE_STRAP) |=
+                               SFUSE_STRAP_DDID_DETECTED;
+                       vgpu_vreg_t(vgpu, SDEISR) |= SDE_PORTD_HOTPLUG_CPT;
+               } else {
+                       vgpu_vreg_t(vgpu, SFUSE_STRAP) &=
+                               ~SFUSE_STRAP_DDID_DETECTED;
+                       vgpu_vreg_t(vgpu, SDEISR) &= ~SDE_PORTD_HOTPLUG_CPT;
+               }
+               vgpu_vreg_t(vgpu, SDEIIR) |= SDE_PORTD_HOTPLUG_CPT;
+               vgpu_vreg_t(vgpu, PCH_PORT_HOTPLUG) |=
+                               PORTD_HOTPLUG_STATUS_MASK;
+               intel_vgpu_trigger_virtual_event(vgpu, DP_D_HOTPLUG);
+       }
+}
+
+/**
  * intel_vgpu_clean_display - clean vGPU virtual display emulation
  * @vgpu: a vGPU
  *

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 4e8947f..43f4242 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -185,6 +185,7 @@ static const struct intel_gvt_ops intel_gvt_ops = {
        .vgpu_query_plane = intel_vgpu_query_plane,
        .vgpu_get_dmabuf = intel_vgpu_get_dmabuf,
        .write_protect_handler = intel_vgpu_page_track_handler,
+       .emulate_hotplug = intel_vgpu_emulate_hotplug,
 };
 
 static void init_device_info(struct intel_gvt *gvt)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 8a4cf99..0ba4b42 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -536,6 +536,8 @@ int intel_vgpu_emulate_cfg_read(struct intel_vgpu *vgpu, unsigned int offset,
 int intel_vgpu_emulate_cfg_write(struct intel_vgpu *vgpu, unsigned int offset,
                void *p_data, unsigned int bytes);
 
+void intel_vgpu_emulate_hotplug(struct intel_vgpu *vgpu, bool connected);
+
 static inline u64 intel_vgpu_get_bar_gpa(struct intel_vgpu *vgpu, int bar)
 {
        /* We are 64bit bar. */
@@ -577,6 +579,7 @@ struct intel_gvt_ops {
        int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);
        int (*write_protect_handler)(struct intel_vgpu *, u64, void *,
                                     unsigned int);
+       void (*emulate_hotplug)(struct intel_vgpu *vgpu, bool connected);
 };