msm: kgsl: Add support for Android's sync point framework
The Android sync point framework will replace the synchronization
previously implemented by genlock. This change implements the KGSL
component of the sync point framework by creating a fence that is
automatically signaled by KGSL when it's timestamp expires. The
fence FD is returned to the user driver so that another process
can wait for the sync point.
Change-Id: Ifee38dfde00e551f3524f7a37833938dcdb64905
Signed-off-by: Jeff Boody <jboody@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_sync.c b/drivers/gpu/msm/kgsl_sync.c
new file mode 100644
index 0000000..025d4cd
--- /dev/null
+++ b/drivers/gpu/msm/kgsl_sync.c
@@ -0,0 +1,204 @@
+/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "kgsl_sync.h"
+
+struct sync_pt *kgsl_sync_pt_create(struct sync_timeline *timeline,
+ unsigned int timestamp)
+{
+ struct sync_pt *pt;
+ pt = sync_pt_create(timeline, (int) sizeof(struct kgsl_sync_pt));
+ if (pt) {
+ struct kgsl_sync_pt *kpt = (struct kgsl_sync_pt *) pt;
+ kpt->timestamp = timestamp;
+ }
+ return pt;
+}
+
+/*
+ * This should only be called on sync_pts which have been created but
+ * not added to a fence.
+ */
+void kgsl_sync_pt_destroy(struct sync_pt *pt)
+{
+ sync_pt_free(pt);
+}
+
+struct sync_pt *kgsl_sync_pt_dup(struct sync_pt *pt)
+{
+ struct kgsl_sync_pt *kpt = (struct kgsl_sync_pt *) pt;
+ return kgsl_sync_pt_create(pt->parent, kpt->timestamp);
+}
+
+int kgsl_sync_pt_has_signaled(struct sync_pt *pt)
+{
+ struct kgsl_sync_pt *kpt = (struct kgsl_sync_pt *) pt;
+ struct kgsl_sync_timeline *ktimeline =
+ (struct kgsl_sync_timeline *) pt->parent;
+ unsigned int ts = kpt->timestamp;
+ unsigned int last_ts = ktimeline->last_timestamp;
+ if (timestamp_cmp(last_ts, ts) >= 0) {
+ /* signaled */
+ return 1;
+ }
+ return 0;
+}
+
+struct kgsl_fence_event_priv {
+ struct kgsl_context *context;
+};
+
+/**
+ * kgsl_fence_event_cb - Event callback for a fence timestamp event
+ * @device - The KGSL device that expired the timestamp
+ * @priv - private data for the event
+ * @context_id - the context id that goes with the timestamp
+ * @timestamp - the timestamp that triggered the event
+ *
+ * Signal a fence following the expiration of a timestamp
+ */
+
+static inline void kgsl_fence_event_cb(struct kgsl_device *device,
+ void *priv, u32 context_id, u32 timestamp)
+{
+ struct kgsl_fence_event_priv *ev = priv;
+ kgsl_sync_timeline_signal(ev->context->timeline, timestamp);
+ kgsl_context_put(ev->context);
+ kfree(ev);
+}
+
+/**
+ * kgsl_add_fence_event - Create a new fence event
+ * @device - KGSL device to create the event on
+ * @timestamp - Timestamp to trigger the event
+ * @data - Return fence fd stored in struct kgsl_timestamp_event_fence
+ * @len - length of the fence event
+ * @owner - driver instance that owns this event
+ * @returns 0 on success or error code on error
+ *
+ * Create a fence and register an event to signal the fence when
+ * the timestamp expires
+ */
+
+int kgsl_add_fence_event(struct kgsl_device *device,
+ u32 context_id, u32 timestamp, void __user *data, int len,
+ struct kgsl_device_private *owner)
+{
+ struct kgsl_fence_event_priv *event;
+ struct kgsl_timestamp_event_fence priv;
+ struct kgsl_context *context;
+ struct sync_pt *pt;
+ struct sync_fence *fence = NULL;
+ int ret = -EINVAL;
+
+ if (len != sizeof(priv))
+ return -EINVAL;
+
+ context = kgsl_find_context(owner, context_id);
+ if (context == NULL)
+ return -EINVAL;
+
+ event = kzalloc(sizeof(*event), GFP_KERNEL);
+ if (event == NULL)
+ return -ENOMEM;
+ event->context = context;
+ kgsl_context_get(context);
+
+ pt = kgsl_sync_pt_create(context->timeline, timestamp);
+ if (pt == NULL) {
+ KGSL_DRV_ERR(device, "kgsl_sync_pt_create failed\n");
+ ret = -ENOMEM;
+ goto fail_pt;
+ }
+
+ fence = sync_fence_create("kgsl-fence", pt);
+ if (fence == NULL) {
+ /* only destroy pt when not added to fence */
+ kgsl_sync_pt_destroy(pt);
+ KGSL_DRV_ERR(device, "sync_fence_create failed\n");
+ ret = -ENOMEM;
+ goto fail_fence;
+ }
+
+ priv.fence_fd = get_unused_fd_flags(0);
+ if (priv.fence_fd < 0) {
+ KGSL_DRV_ERR(device, "invalid fence fd\n");
+ ret = -EINVAL;
+ goto fail_fd;
+ }
+ sync_fence_install(fence, priv.fence_fd);
+
+ if (copy_to_user(data, &priv, sizeof(priv))) {
+ ret = -EFAULT;
+ goto fail_copy_fd;
+ }
+
+ ret = kgsl_add_event(device, context_id, timestamp,
+ kgsl_fence_event_cb, event, owner);
+ if (ret)
+ goto fail_event;
+
+ return 0;
+
+fail_event:
+fail_copy_fd:
+ /* clean up sync_fence_install */
+ sync_fence_put(fence);
+ put_unused_fd(priv.fence_fd);
+fail_fd:
+ /* clean up sync_fence_create */
+ sync_fence_put(fence);
+fail_fence:
+fail_pt:
+ kgsl_context_put(context);
+ kfree(event);
+ return ret;
+}
+
+static const struct sync_timeline_ops kgsl_sync_timeline_ops = {
+ .dup = kgsl_sync_pt_dup,
+ .has_signaled = kgsl_sync_pt_has_signaled,
+};
+
+int kgsl_sync_timeline_create(struct kgsl_context *context)
+{
+ struct kgsl_sync_timeline *ktimeline;
+
+ context->timeline = sync_timeline_create(&kgsl_sync_timeline_ops,
+ (int) sizeof(struct kgsl_sync_timeline), "kgsl-timeline");
+ if (context->timeline == NULL)
+ return -EINVAL;
+
+ ktimeline = (struct kgsl_sync_timeline *) context->timeline;
+ ktimeline->last_timestamp = 0;
+
+ return 0;
+}
+
+void kgsl_sync_timeline_signal(struct sync_timeline *timeline,
+ unsigned int timestamp)
+{
+ struct kgsl_sync_timeline *ktimeline =
+ (struct kgsl_sync_timeline *) timeline;
+ ktimeline->last_timestamp = timestamp;
+ sync_timeline_signal(timeline);
+}
+
+void kgsl_sync_timeline_destroy(struct kgsl_context *context)
+{
+ sync_timeline_destroy(context->timeline);
+}