Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / vmwgfx / vmwgfx_marker.c

diff --git a/kernel/drivers/gpu/drm/vmwgfx/vmwgfx_marker.c b/kernel/drivers/gpu/drm/vmwgfx/vmwgfx_marker.c
new file mode 100644 (file)
index 0000000..efd1ffd
--- /dev/null
+++ b/kernel/drivers/gpu/drm/vmwgfx/vmwgfx_marker.c
@@ -0,0 +1,155 @@
+/**************************************************************************
+ *
+ * Copyright (C) 2010 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "vmwgfx_drv.h"
+
+struct vmw_marker {
+       struct list_head head;
+       uint32_t seqno;
+       u64 submitted;
+};
+
+void vmw_marker_queue_init(struct vmw_marker_queue *queue)
+{
+       INIT_LIST_HEAD(&queue->head);
+       queue->lag = 0;
+       queue->lag_time = ktime_get_raw_ns();
+       spin_lock_init(&queue->lock);
+}
+
+void vmw_marker_queue_takedown(struct vmw_marker_queue *queue)
+{
+       struct vmw_marker *marker, *next;
+
+       spin_lock(&queue->lock);
+       list_for_each_entry_safe(marker, next, &queue->head, head) {
+               kfree(marker);
+       }
+       spin_unlock(&queue->lock);
+}
+
+int vmw_marker_push(struct vmw_marker_queue *queue,
+                  uint32_t seqno)
+{
+       struct vmw_marker *marker = kmalloc(sizeof(*marker), GFP_KERNEL);
+
+       if (unlikely(!marker))
+               return -ENOMEM;
+
+       marker->seqno = seqno;
+       marker->submitted = ktime_get_raw_ns();
+       spin_lock(&queue->lock);
+       list_add_tail(&marker->head, &queue->head);
+       spin_unlock(&queue->lock);
+
+       return 0;
+}
+
+int vmw_marker_pull(struct vmw_marker_queue *queue,
+                  uint32_t signaled_seqno)
+{
+       struct vmw_marker *marker, *next;
+       bool updated = false;
+       u64 now;
+
+       spin_lock(&queue->lock);
+       now = ktime_get_raw_ns();
+
+       if (list_empty(&queue->head)) {
+               queue->lag = 0;
+               queue->lag_time = now;
+               updated = true;
+               goto out_unlock;
+       }
+
+       list_for_each_entry_safe(marker, next, &queue->head, head) {
+               if (signaled_seqno - marker->seqno > (1 << 30))
+                       continue;
+
+               queue->lag = now - marker->submitted;
+               queue->lag_time = now;
+               updated = true;
+               list_del(&marker->head);
+               kfree(marker);
+       }
+
+out_unlock:
+       spin_unlock(&queue->lock);
+
+       return (updated) ? 0 : -EBUSY;
+}
+
+static u64 vmw_fifo_lag(struct vmw_marker_queue *queue)
+{
+       u64 now;
+
+       spin_lock(&queue->lock);
+       now = ktime_get_raw_ns();
+       queue->lag += now - queue->lag_time;
+       queue->lag_time = now;
+       spin_unlock(&queue->lock);
+       return queue->lag;
+}
+
+
+static bool vmw_lag_lt(struct vmw_marker_queue *queue,
+                      uint32_t us)
+{
+       u64 cond = (u64) us * NSEC_PER_USEC;
+
+       return vmw_fifo_lag(queue) <= cond;
+}
+
+int vmw_wait_lag(struct vmw_private *dev_priv,
+                struct vmw_marker_queue *queue, uint32_t us)
+{
+       struct vmw_marker *marker;
+       uint32_t seqno;
+       int ret;
+
+       while (!vmw_lag_lt(queue, us)) {
+               spin_lock(&queue->lock);
+               if (list_empty(&queue->head))
+                       seqno = atomic_read(&dev_priv->marker_seq);
+               else {
+                       marker = list_first_entry(&queue->head,
+                                                struct vmw_marker, head);
+                       seqno = marker->seqno;
+               }
+               spin_unlock(&queue->lock);
+
+               ret = vmw_wait_seqno(dev_priv, false, seqno, true,
+                                       3*HZ);
+
+               if (unlikely(ret != 0))
+                       return ret;
+
+               (void) vmw_marker_pull(queue, seqno);
+       }
+       return 0;
+}