1 files changed, 202 insertions, 0 deletions
diff --git a/src/gallium/drivers/nvc0/nvc0_fence.c b/src/gallium/drivers/nvc0/nvc0_fence.c
new file mode 100644
index 00000000000..7c214ca9a75
--- /dev/null
+++ b/src/gallium/drivers/nvc0/nvc0_fence.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright 2010 Christoph Bumiller
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS 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 "nvc0_fence.h"
+#include "nvc0_context.h"
+#include "nvc0_screen.h"
+
+#ifdef PIPE_OS_UNIX
+#include <sched.h>
+#endif
+
+boolean
+nvc0_screen_fence_new(struct nvc0_screen *screen, struct nvc0_fence **fence,
+                      boolean emit)
+{
+   *fence = CALLOC_STRUCT(nvc0_fence);
+   if (!*fence)
+      return FALSE;
+
+   (*fence)->screen = screen;
+   (*fence)->ref = 1;
+
+   if (emit)
+      nvc0_fence_emit(*fence);
+
+   return TRUE;
+}
+
+void
+nvc0_fence_emit(struct nvc0_fence *fence)
+{
+   struct nvc0_screen *screen = fence->screen;
+   struct nouveau_channel *chan = screen->base.channel;
+
+   fence->sequence = ++screen->fence.sequence;
+
+   assert(fence->state == NVC0_FENCE_STATE_AVAILABLE);
+
+   BEGIN_RING(chan, RING_3D(QUERY_ADDRESS_HIGH), 4);
+   OUT_RELOCh(chan, screen->fence.bo, 0, NOUVEAU_BO_WR);
+   OUT_RELOCl(chan, screen->fence.bo, 0, NOUVEAU_BO_WR);
+   OUT_RING  (chan, fence->sequence);
+   OUT_RING  (chan, NVC0_3D_QUERY_GET_FENCE);
+
+   ++fence->ref;
+
+   if (screen->fence.tail)
+      screen->fence.tail->next = fence;
+   else
+      screen->fence.head = fence;
+
+   screen->fence.tail = fence;
+
+   fence->state = NVC0_FENCE_STATE_EMITTED;
+}
+
+static void
+nvc0_fence_trigger_release_buffers(struct nvc0_fence *fence);
+
+void
+nvc0_fence_del(struct nvc0_fence *fence)
+{
+   struct nvc0_fence *it;
+   struct nvc0_screen *screen = fence->screen;
+
+   if (fence->state == NVC0_FENCE_STATE_EMITTED) {
+      if (fence == screen->fence.head) {
+         screen->fence.head = fence->next;
+         if (!screen->fence.head)
+            screen->fence.tail = NULL;
+      } else {
+         for (it = screen->fence.head; it && it->next != fence; it = it->next);
+         it->next = fence->next;
+         if (screen->fence.tail == fence)
+            screen->fence.tail = it;
+      }
+   }
+
+   if (fence->buffers) {
+      debug_printf("WARNING: deleting fence with buffers "
+                   "still hooked to it !\n");
+      nvc0_fence_trigger_release_buffers(fence);
+   }
+
+   FREE(fence);
+}
+
+static void
+nvc0_fence_trigger_release_buffers(struct nvc0_fence *fence)
+{
+   struct nvc0_mm_allocation *alloc = fence->buffers;
+
+   while (alloc) {
+      struct nvc0_mm_allocation *next = alloc->next;
+      nvc0_mm_free(alloc);
+      alloc = next;
+   };
+   fence->buffers = NULL;
+}
+
+static void
+nvc0_screen_fence_update(struct nvc0_screen *screen)
+{
+   struct nvc0_fence *fence;
+   struct nvc0_fence *next = NULL;
+   uint32_t sequence = screen->fence.map[0];
+
+   if (screen->fence.sequence_ack == sequence)
+      return;
+   screen->fence.sequence_ack = sequence;
+
+   for (fence = screen->fence.head; fence; fence = next) {
+      next = fence->next;
+      sequence = fence->sequence;
+
+      fence->state = NVC0_FENCE_STATE_SIGNALLED;
+
+      if (fence->buffers)
+         nvc0_fence_trigger_release_buffers(fence);
+
+      nvc0_fence_reference(&fence, NULL);
+
+      if (sequence == screen->fence.sequence_ack)
+         break;
+   }
+   screen->fence.head = next;
+   if (!next)
+      screen->fence.tail = NULL;
+}
+
+#define NVC0_FENCE_MAX_SPINS (1 << 17)
+
+boolean
+nvc0_fence_signalled(struct nvc0_fence *fence)
+{
+   struct nvc0_screen *screen = fence->screen;
+
+   if (fence->state == NVC0_FENCE_STATE_EMITTED)
+      nvc0_screen_fence_update(screen);
+
+   return fence->state == NVC0_FENCE_STATE_SIGNALLED;
+}
+
+boolean
+nvc0_fence_wait(struct nvc0_fence *fence)
+{
+   struct nvc0_screen *screen = fence->screen;
+   int spins = 0;
+
+   if (fence->state == NVC0_FENCE_STATE_AVAILABLE) {
+      nvc0_fence_emit(fence);
+
+      FIRE_RING(screen->base.channel);
+
+      if (fence == screen->fence.current)
+         nvc0_screen_fence_new(screen, &screen->fence.current, FALSE);
+   }
+
+   do {
+      nvc0_screen_fence_update(screen);
+
+      if (fence->state == NVC0_FENCE_STATE_SIGNALLED)
+         return TRUE;
+      spins++;
+#ifdef PIPE_OS_UNIX
+      if (!(spins % 8)) /* donate a few cycles */
+         sched_yield();
+#endif
+   } while (spins < NVC0_FENCE_MAX_SPINS);
+
+   if (spins > 9000)
+      NOUVEAU_ERR("fence %x: been spinning too long\n", fence->sequence);
+
+   return FALSE;
+}
+
+void
+nvc0_screen_fence_next(struct nvc0_screen *screen)
+{
+   nvc0_fence_emit(screen->fence.current);
+   nvc0_screen_fence_new(screen, &screen->fence.current, FALSE);
+   nvc0_screen_fence_update(screen);
+}