drm/i915/gvt: introudce intel_vgpu_reset_resource() to reset vgpu resource state

This patch introudces a new function intel_vgpu_reset_resource() to
reset allocated vgpu resources by intel_vgpu_alloc_resource(). So far
we only need clear the fence registers. The function _clear_vgpu_fence()
will reset both virtual and physical fence registers to 0.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/aperture_gm.c b/drivers/gpu/drm/i915/gvt/aperture_gm.c
index 6520031..f7bce86 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/aperture_gm.c
+++ b/drivers/gpu/drm/i915/gvt/aperture_gm.c
@@ -158,6 +158,14 @@ void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
        POSTING_READ(fence_reg_lo);
 }
 
+static void _clear_vgpu_fence(struct intel_vgpu *vgpu)
+{
+       int i;
+
+       for (i = 0; i < vgpu_fence_sz(vgpu); i++)
+               intel_vgpu_write_fence(vgpu, i, 0);
+}
+
 static void free_vgpu_fence(struct intel_vgpu *vgpu)
 {
        struct intel_gvt *gvt = vgpu->gvt;
@@ -171,9 +179,9 @@ static void free_vgpu_fence(struct intel_vgpu *vgpu)
        intel_runtime_pm_get(dev_priv);
 
        mutex_lock(&dev_priv->drm.struct_mutex);
+       _clear_vgpu_fence(vgpu);
        for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
                reg = vgpu->fence.regs[i];
-               intel_vgpu_write_fence(vgpu, i, 0);
                list_add_tail(&reg->link,
                              &dev_priv->mm.fence_list);
        }
@@ -201,13 +209,14 @@ static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
                        continue;
                list_del(pos);
                vgpu->fence.regs[i] = reg;
-               intel_vgpu_write_fence(vgpu, i, 0);
                if (++i == vgpu_fence_sz(vgpu))
                        break;
        }
        if (i != vgpu_fence_sz(vgpu))
                goto out_free_fence;
 
+       _clear_vgpu_fence(vgpu);
+
        mutex_unlock(&dev_priv->drm.struct_mutex);
        intel_runtime_pm_put(dev_priv);
        return 0;
@@ -307,6 +316,22 @@ void intel_vgpu_free_resource(struct intel_vgpu *vgpu)
 }
 
 /**
+ * intel_vgpu_reset_resource - reset resource state owned by a vGPU
+ * @vgpu: a vGPU
+ *
+ * This function is used to reset resource state owned by a vGPU.
+ *
+ */
+void intel_vgpu_reset_resource(struct intel_vgpu *vgpu)
+{
+       struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+
+       intel_runtime_pm_get(dev_priv);
+       _clear_vgpu_fence(vgpu);
+       intel_runtime_pm_put(dev_priv);
+}
+
+/**
  * intel_alloc_vgpu_resource - allocate HW resource for a vGPU
  * @vgpu: vGPU
  * @param: vGPU creation params

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 0af1701..455281d 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -323,6 +323,7 @@ struct intel_vgpu_creation_params {
 
 int intel_vgpu_alloc_resource(struct intel_vgpu *vgpu,
                              struct intel_vgpu_creation_params *param);
+void intel_vgpu_reset_resource(struct intel_vgpu *vgpu);
 void intel_vgpu_free_resource(struct intel_vgpu *vgpu);
 void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
        u32 fence, u64 value);