commit 04d348ae3f0aea6523bc3b0688b5fc90c1c60d0e
author Zhi Wang <zhi.a.wang@intel.com> Mon Apr 25 18:28:56 2016 -0400
committer Zhenyu Wang <zhenyuw@linux.intel.com> Fri Oct 14 18:13:06 2016 +0800
tree 1eadc499b3da6b57f1bebed7b81f77a79b9a8144
parent e39c5add322184de3be052d438dfd24375bfeaea

drm/i915/gvt: vGPU display virtualization

This patch introduces the GVT-g display virtualization.

It consists a collection of display MMIO handlers, like power well register
handler, pipe register handler, plane register handler, which will emulate
all display MMIOs behavior to support virtual mode setting sequence for
guest.

Signed-off-by: Bing Niu <bing.niu@intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/interrupt.c

diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
index d90c5f6..84d7174 100644
--- a/drivers/gpu/drm/i915/gvt/interrupt.c
+++ b/drivers/gpu/drm/i915/gvt/interrupt.c
@@ -667,6 +667,21 @@
 	}
 }
 
+static enum hrtimer_restart vblank_timer_fn(struct hrtimer *data)
+{
+	struct intel_gvt_vblank_timer *vblank_timer;
+	struct intel_gvt_irq *irq;
+	struct intel_gvt *gvt;
+
+	vblank_timer = container_of(data, struct intel_gvt_vblank_timer, timer);
+	irq = container_of(vblank_timer, struct intel_gvt_irq, vblank_timer);
+	gvt = container_of(irq, struct intel_gvt, irq);
+
+	intel_gvt_request_service(gvt, INTEL_GVT_REQUEST_EMULATE_VBLANK);
+	hrtimer_add_expires_ns(&vblank_timer->timer, vblank_timer->period);
+	return HRTIMER_RESTART;
+}
+
 /**
  * intel_gvt_clean_irq - clean up GVT-g IRQ emulation subsystem
  * @gvt: a GVT device
@@ -677,8 +692,13 @@
  */
 void intel_gvt_clean_irq(struct intel_gvt *gvt)
 {
+	struct intel_gvt_irq *irq = &gvt->irq;
+
+	hrtimer_cancel(&irq->vblank_timer.timer);
 }
 
+#define VBLNAK_TIMER_PERIOD 16000000
+
 /**
  * intel_gvt_init_irq - initialize GVT-g IRQ emulation subsystem
  * @gvt: a GVT device
@@ -692,6 +712,7 @@
 int intel_gvt_init_irq(struct intel_gvt *gvt)
 {
 	struct intel_gvt_irq *irq = &gvt->irq;
+	struct intel_gvt_vblank_timer *vblank_timer = &irq->vblank_timer;
 
 	gvt_dbg_core("init irq framework\n");
 
@@ -710,5 +731,10 @@
 	irq->ops->init_irq(irq);
 
 	init_irq_map(irq);
+
+	hrtimer_init(&vblank_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	vblank_timer->timer.function = vblank_timer_fn;
+	vblank_timer->period = VBLNAK_TIMER_PERIOD;
+
 	return 0;
 }