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>
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 6b5061b..27e1dd9 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -32,6 +32,7 @@
#include <linux/types.h>
#include <xen/xen.h>
+#include <linux/kthread.h>
#include "i915_drv.h"
@@ -114,6 +115,52 @@
}
}
+static int gvt_service_thread(void *data)
+{
+ struct intel_gvt *gvt = (struct intel_gvt *)data;
+ int ret;
+
+ gvt_dbg_core("service thread start\n");
+
+ while (!kthread_should_stop()) {
+ ret = wait_event_interruptible(gvt->service_thread_wq,
+ kthread_should_stop() || gvt->service_request);
+
+ if (kthread_should_stop())
+ break;
+
+ if (WARN_ONCE(ret, "service thread is waken up by signal.\n"))
+ continue;
+
+ if (test_and_clear_bit(INTEL_GVT_REQUEST_EMULATE_VBLANK,
+ (void *)&gvt->service_request)) {
+ mutex_lock(&gvt->lock);
+ intel_gvt_emulate_vblank(gvt);
+ mutex_unlock(&gvt->lock);
+ }
+ }
+
+ return 0;
+}
+
+static void clean_service_thread(struct intel_gvt *gvt)
+{
+ kthread_stop(gvt->service_thread);
+}
+
+static int init_service_thread(struct intel_gvt *gvt)
+{
+ init_waitqueue_head(&gvt->service_thread_wq);
+
+ gvt->service_thread = kthread_run(gvt_service_thread,
+ gvt, "gvt_service_thread");
+ if (IS_ERR(gvt->service_thread)) {
+ gvt_err("fail to start service thread.\n");
+ return PTR_ERR(gvt->service_thread);
+ }
+ return 0;
+}
+
/**
* intel_gvt_clean_device - clean a GVT device
* @gvt: intel gvt device
@@ -129,6 +176,7 @@
if (WARN_ON(!gvt->initialized))
return;
+ clean_service_thread(gvt);
intel_gvt_clean_opregion(gvt);
intel_gvt_clean_gtt(gvt);
intel_gvt_clean_irq(gvt);
@@ -191,10 +239,16 @@
if (ret)
goto out_clean_gtt;
+ ret = init_service_thread(gvt);
+ if (ret)
+ goto out_clean_opregion;
+
gvt_dbg_core("gvt device creation is done\n");
gvt->initialized = true;
return 0;
+out_clean_opregion:
+ intel_gvt_clean_opregion(gvt);
out_clean_gtt:
intel_gvt_clean_gtt(gvt);
out_clean_irq: