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>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
index d90c5f660b00..84d7174d0081 100644
--- a/drivers/gpu/drm/i915/gvt/interrupt.c
+++ b/drivers/gpu/drm/i915/gvt/interrupt.c
@@ -667,6 +667,21 @@ static void init_events(
 	}
 }
 
+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 @@ static void init_events(
  */
 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 @@ void intel_gvt_clean_irq(struct intel_gvt *gvt)
 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 @@ int intel_gvt_init_irq(struct intel_gvt *gvt)
 	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;
 }