drm/i915/gvt: Add runtime pm around fences

Manipulating the fence_list requires the runtime wakelock, as does
writing to the fence registers. Acquire a wakelock for the former, and
assert that the device is awake for the latter.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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 db503c1..0d41ebc 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/aperture_gm.c
+++ b/drivers/gpu/drm/i915/gvt/aperture_gm.c
@@ -145,6 +145,8 @@ void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
        struct drm_i915_fence_reg *reg;
        i915_reg_t fence_reg_lo, fence_reg_hi;
 
+       assert_rpm_wakelock_held(dev_priv);
+
        if (WARN_ON(fence > vgpu_fence_sz(vgpu)))
                return;
 
@@ -173,6 +175,8 @@ static void free_vgpu_fence(struct intel_vgpu *vgpu)
        if (WARN_ON(!vgpu_fence_sz(vgpu)))
                return;
 
+       intel_runtime_pm_get(dev_priv);
+
        mutex_lock(&dev_priv->drm.struct_mutex);
        for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
                reg = vgpu->fence.regs[i];
@@ -181,6 +185,8 @@ static void free_vgpu_fence(struct intel_vgpu *vgpu)
                              &dev_priv->mm.fence_list);
        }
        mutex_unlock(&dev_priv->drm.struct_mutex);
+
+       intel_runtime_pm_put(dev_priv);
 }
 
 static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
@@ -191,6 +197,8 @@ static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
        int i;
        struct list_head *pos, *q;
 
+       intel_runtime_pm_get(dev_priv);
+
        /* Request fences from host */
        mutex_lock(&dev_priv->drm.struct_mutex);
        i = 0;
@@ -208,6 +216,7 @@ static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
                goto out_free_fence;
 
        mutex_unlock(&dev_priv->drm.struct_mutex);
+       intel_runtime_pm_put(dev_priv);
        return 0;
 out_free_fence:
        /* Return fences to host, if fail */
@@ -219,6 +228,7 @@ out_free_fence:
                              &dev_priv->mm.fence_list);
        }
        mutex_unlock(&dev_priv->drm.struct_mutex);
+       intel_runtime_pm_put(dev_priv);
        return -ENOSPC;
 }