Release_fence is very similar if not the same as out_fence; it
is an additional signalling mechanism for a page flip completion.
Signed-off-by: Vivek Kasireddy <vivek.kasire...@intel.com>
---
drivers/gpu/drm/drm_atomic_uapi.c | 43 +++++++++++++++++++++++++++++--
drivers/gpu/drm/drm_crtc.c | 2 ++
drivers/gpu/drm/drm_mode_config.c | 6 +++++
include/drm/drm_atomic.h | 1 +
include/drm/drm_file.h | 9 +++++++
include/drm/drm_mode_config.h | 7 +++++
6 files changed, 66 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c
b/drivers/gpu/drm/drm_atomic_uapi.c
index 6436677fa2f8..5d0bf3e525b3 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -367,6 +367,23 @@ static s32 __user *get_out_fence_for_crtc(struct
drm_atomic_state *state,
return fence_ptr;
}
+static void set_release_fence_for_crtc(struct drm_atomic_state *state,
+ struct drm_crtc *crtc, s32 __user *fence_ptr)
+{
+ state->crtcs[drm_crtc_index(crtc)].release_fence_ptr = fence_ptr;
+}
+
+static s32 __user *get_release_fence_for_crtc(struct drm_atomic_state *state,
+ struct drm_crtc *crtc)
+{
+ s32 __user *fence_ptr;
+
+ fence_ptr = state->crtcs[drm_crtc_index(crtc)].release_fence_ptr;
+ state->crtcs[drm_crtc_index(crtc)].release_fence_ptr = NULL;
+
+ return fence_ptr;
+}
+
static int set_out_fence_for_connector(struct drm_atomic_state *state,
struct drm_connector *connector,
s32 __user *fence_ptr)
@@ -482,6 +499,16 @@ static int drm_atomic_crtc_set_property(struct drm_crtc
*crtc,
return -EFAULT;
set_out_fence_for_crtc(state->state, crtc, fence_ptr);
+ } else if (property == config->prop_release_fence_ptr) {
+ s32 __user *fence_ptr = u64_to_user_ptr(val);
+
+ if (!fence_ptr)
+ return 0;
+
+ if (put_user(-1, fence_ptr))
+ return -EFAULT;
+
+ set_release_fence_for_crtc(state->state, crtc, fence_ptr);
} else if (property == crtc->scaling_filter_property) {
state->scaling_filter = val;
} else if (crtc->funcs->atomic_set_property) {
@@ -519,6 +546,8 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
*val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
else if (property == config->prop_out_fence_ptr)
*val = 0;
+ else if (property == config->prop_release_fence_ptr)
+ *val = 0;
else if (property == crtc->scaling_filter_property)
*val = state->scaling_filter;
else if (crtc->funcs->atomic_get_property)
@@ -1185,7 +1214,7 @@ static int prepare_signaling(struct drm_device *dev,
for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
struct dma_fence *fence;
- s32 __user *fence_ptr;
+ s32 __user *fence_ptr, *rel_fence_ptr;
fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
@@ -1220,9 +1249,19 @@ static int prepare_signaling(struct drm_device *dev,
if (IS_ERR(fence))
return PTR_ERR(fence);
+ crtc_state->event->base.fence = fence;
+ }
+ rel_fence_ptr = get_release_fence_for_crtc(crtc_state->state,
+ crtc);
+ if (rel_fence_ptr) {
+ fence = crtc_create_out_fence(crtc, fence_state,
+ rel_fence_ptr,
+ num_fences);
+ if (IS_ERR(fence))
+ return PTR_ERR(fence);
- crtc_state->event->base.fence = fence;
+ crtc_state->event->base.release_fence = fence;
}
c++;
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 26a77a735905..e682ac04f873 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -312,6 +312,8 @@ static int __drm_crtc_init_with_planes(struct drm_device
*dev, struct drm_crtc *
drm_object_attach_property(&crtc->base, config->prop_mode_id,
0);
drm_object_attach_property(&crtc->base,
config->prop_out_fence_ptr, 0);
+ drm_object_attach_property(&crtc->base,
+ config->prop_release_fence_ptr, 0);
drm_object_attach_property(&crtc->base,
config->prop_vrr_enabled, 0);
}
diff --git a/drivers/gpu/drm/drm_mode_config.c
b/drivers/gpu/drm/drm_mode_config.c
index 37b4b9f0e468..fc1f5a8d2991 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -297,6 +297,12 @@ static int drm_mode_create_standard_properties(struct
drm_device *dev)
return -ENOMEM;
dev->mode_config.prop_out_fence_ptr = prop;
+ prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+ "RELEASE_FENCE_PTR", 0, U64_MAX);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.prop_release_fence_ptr = prop;
+
prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
"CRTC_ID", DRM_MODE_OBJECT_CRTC);
if (!prop)
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 1701c2128a5c..00f5fad87757 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -177,6 +177,7 @@ struct __drm_crtcs_state {
struct drm_crtc_commit *commit;
s32 __user *out_fence_ptr;
+ s32 __user *release_fence_ptr;
u64 last_vblank_count;
};
diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index a3acb7ac3550..ba79e1765721 100644
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -124,6 +124,15 @@ struct drm_pending_event {
*/
struct dma_fence *fence;
+ /**
+ * @release_fence:
+ *
+ * Optional DMA fence that will be signalled by the drm driver to
+ * indicate that all references on FBs associated with a page flip
+ * can be dropped.
+ */
+ struct dma_fence *release_fence;
+
/**
* @file_priv:
*
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 48b7de80daf5..12b964540069 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -642,6 +642,13 @@ struct drm_mode_config {
* value of type s32, and then cast that pointer to u64.
*/
struct drm_property *prop_out_fence_ptr;
+ /**
+ * @prop_release_fence_ptr: Sync File fd pointer that is used as an
+ * additional flip completion signalling mechanism. Userspace should
+ * provide a pointer to a value of type s32, and then cast that pointer
+ * to u64.
+ */
+ struct drm_property *prop_release_fence_ptr;
/**
* @prop_crtc_id: Default atomic plane property to specify the
* &drm_crtc.
--
2.30.2
