1 files changed, 104 insertions, 0 deletions
diff --git a/src/gallium/drivers/v3d/v3d_fence.c b/src/gallium/drivers/v3d/v3d_fence.c
new file mode 100644
index 00000000000..54bce562403
--- /dev/null
+++ b/src/gallium/drivers/v3d/v3d_fence.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * 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 (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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/** @file vc5_fence.c
+ *
+ * Seqno-based fence management.
+ *
+ * We have two mechanisms for waiting in our kernel API: You can wait on a BO
+ * to have all rendering to from any process to be completed, or wait on a
+ * seqno for that particular seqno to be passed.  The fence API we're
+ * implementing is based on waiting for all rendering in the context to have
+ * completed (with no reference to what other processes might be doing with
+ * the same BOs), so we can just use the seqno of the last rendering we'd
+ * fired off as our fence marker.
+ */
+
+#include "util/u_inlines.h"
+
+#include "v3d_context.h"
+#include "v3d_bufmgr.h"
+
+struct vc5_fence {
+        struct pipe_reference reference;
+        uint32_t sync;
+};
+
+static void
+vc5_fence_reference(struct pipe_screen *pscreen,
+                    struct pipe_fence_handle **pp,
+                    struct pipe_fence_handle *pf)
+{
+        struct vc5_screen *screen = vc5_screen(pscreen);
+        struct vc5_fence **p = (struct vc5_fence **)pp;
+        struct vc5_fence *f = (struct vc5_fence *)pf;
+        struct vc5_fence *old = *p;
+
+        if (pipe_reference(&(*p)->reference, &f->reference)) {
+                drmSyncobjDestroy(screen->fd, old->sync);
+                free(old);
+        }
+        *p = f;
+}
+
+static boolean
+vc5_fence_finish(struct pipe_screen *pscreen,
+		 struct pipe_context *ctx,
+                 struct pipe_fence_handle *pf,
+                 uint64_t timeout_ns)
+{
+        struct vc5_screen *screen = vc5_screen(pscreen);
+        struct vc5_fence *f = (struct vc5_fence *)pf;
+
+        return drmSyncobjWait(screen->fd, &f->sync, 1, timeout_ns, 0, NULL);
+}
+
+struct vc5_fence *
+vc5_fence_create(struct vc5_context *vc5)
+{
+        struct vc5_fence *f = calloc(1, sizeof(*f));
+        if (!f)
+                return NULL;
+
+        uint32_t new_sync;
+        /* Make a new sync object for the context. */
+        int ret = drmSyncobjCreate(vc5->fd, DRM_SYNCOBJ_CREATE_SIGNALED,
+                                   &new_sync);
+        if (ret) {
+                free(f);
+                return NULL;
+        }
+
+        pipe_reference_init(&f->reference, 1);
+        f->sync = vc5->out_sync;
+        vc5->out_sync = new_sync;
+
+        return f;
+}
+
+void
+vc5_fence_init(struct vc5_screen *screen)
+{
+        screen->base.fence_reference = vc5_fence_reference;
+        screen->base.fence_finish = vc5_fence_finish;
+}