nouveau: move nv50/nvc0 fencing to common location, and modify slightly

Modified from original to remove chipset-specific code, and to be decoupled
from the mm present in said drivers.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

5 files changed, 296 insertions, 4 deletions

diff --git a/src/gallium/drivers/nouveau/Makefile b/src/gallium/drivers/nouveau/Makefile
index a33bf5ebc2..a338be9a0b 100644
--- a/src/gallium/drivers/nouveau/Makefile
+++ b/src/gallium/drivers/nouveau/Makefile
@@ -7,6 +7,7 @@ LIBRARY_INCLUDES = \
 	$(LIBDRM_CFLAGS) \
 	-I$(TOP)/src/gallium/drivers/nouveau/include
 
-C_SOURCES = nouveau_screen.c 
+C_SOURCES = nouveau_screen.c \
+            nouveau_fence.c
 
 include ../../Makefile.template
diff --git a/src/gallium/drivers/nouveau/nouveau_fence.c b/src/gallium/drivers/nouveau/nouveau_fence.c
new file mode 100644
index 0000000000..18bdb18ad4
--- /dev/null
+++ b/src/gallium/drivers/nouveau/nouveau_fence.c
@@ -0,0 +1,220 @@
+/*
+ * 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 "util/u_double_list.h"
+
+#include "nouveau_screen.h"
+#include "nouveau_fence.h"
+
+#include "nouveau/nouveau_pushbuf.h"
+
+#ifdef PIPE_OS_UNIX
+#include <sched.h>
+#endif
+
+boolean
+nouveau_fence_new(struct nouveau_screen *screen, struct nouveau_fence **fence,
+                  boolean emit)
+{
+   *fence = CALLOC_STRUCT(nouveau_fence);
+   if (!*fence)
+      return FALSE;
+
+   (*fence)->screen = screen;
+   (*fence)->ref = 1;
+   LIST_INITHEAD(&(*fence)->work);
+
+   if (emit)
+      nouveau_fence_emit(*fence);
+
+   return TRUE;
+}
+
+static void
+nouveau_fence_trigger_work(struct nouveau_fence *fence)
+{
+   struct nouveau_fence_work *work, *tmp;
+
+   LIST_FOR_EACH_ENTRY_SAFE(work, tmp, &fence->work, list) {
+      work->func(work->data);
+      LIST_DEL(&work->list);
+      FREE(work);
+   }
+}
+
+boolean
+nouveau_fence_work(struct nouveau_fence *fence,
+                   void (*func)(void *), void *data)
+{
+   struct nouveau_fence_work *work;
+
+   if (!fence || fence->state == NOUVEAU_FENCE_STATE_SIGNALLED) {
+      func(data);
+      return TRUE;
+   }
+
+   work = CALLOC_STRUCT(nouveau_fence_work);
+   if (!work)
+      return FALSE;
+   work->func = func;
+   work->data = data;
+   LIST_ADD(&work->list, &fence->work);
+   return TRUE;
+}
+
+void
+nouveau_fence_emit(struct nouveau_fence *fence)
+{
+   struct nouveau_screen *screen = fence->screen;
+
+   fence->sequence = ++screen->fence.sequence;
+
+   assert(fence->state == NOUVEAU_FENCE_STATE_AVAILABLE);
+
+   screen->fence.emit(&screen->base, fence->sequence);
+
+   ++fence->ref;
+
+   if (screen->fence.tail)
+      screen->fence.tail->next = fence;
+   else
+      screen->fence.head = fence;
+
+   screen->fence.tail = fence;
+
+   fence->state = NOUVEAU_FENCE_STATE_EMITTED;
+}
+
+void
+nouveau_fence_del(struct nouveau_fence *fence)
+{
+   struct nouveau_fence *it;
+   struct nouveau_screen *screen = fence->screen;
+
+   if (fence->state == NOUVEAU_FENCE_STATE_EMITTED ||
+       fence->state == NOUVEAU_FENCE_STATE_FLUSHED) {
+      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 (!LIST_IS_EMPTY(&fence->work)) {
+      debug_printf("WARNING: deleting fence with work still pending !\n");
+      nouveau_fence_trigger_work(fence);
+   }
+
+   FREE(fence);
+}
+
+void
+nouveau_fence_update(struct nouveau_screen *screen, boolean flushed)
+{
+   struct nouveau_fence *fence;
+   struct nouveau_fence *next = NULL;
+   u32 sequence = screen->fence.update(&screen->base);
+
+   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 = NOUVEAU_FENCE_STATE_SIGNALLED;
+
+      nouveau_fence_trigger_work(fence);
+      nouveau_fence_ref(NULL, &fence);
+
+      if (sequence == screen->fence.sequence_ack)
+         break;
+   }
+   screen->fence.head = next;
+   if (!next)
+      screen->fence.tail = NULL;
+
+   if (flushed) {
+      for (fence = next; fence; fence = fence->next)
+         fence->state = NOUVEAU_FENCE_STATE_FLUSHED;
+   }
+}
+
+#define NOUVEAU_FENCE_MAX_SPINS (1 << 31)
+
+boolean
+nouveau_fence_signalled(struct nouveau_fence *fence)
+{
+   struct nouveau_screen *screen = fence->screen;
+
+   if (fence->state >= NOUVEAU_FENCE_STATE_EMITTED)
+      nouveau_fence_update(screen, FALSE);
+
+   return fence->state == NOUVEAU_FENCE_STATE_SIGNALLED;
+}
+
+boolean
+nouveau_fence_wait(struct nouveau_fence *fence)
+{
+   struct nouveau_screen *screen = fence->screen;
+   uint32_t spins = 0;
+
+   if (fence->state < NOUVEAU_FENCE_STATE_EMITTED) {
+      nouveau_fence_emit(fence);
+
+      if (fence == screen->fence.current)
+         nouveau_fence_new(screen, &screen->fence.current, FALSE);
+   }
+   if (fence->state < NOUVEAU_FENCE_STATE_FLUSHED)
+      FIRE_RING(screen->channel);
+
+   do {
+      nouveau_fence_update(screen, FALSE);
+
+      if (fence->state == NOUVEAU_FENCE_STATE_SIGNALLED)
+         return TRUE;
+      spins++;
+#ifdef PIPE_OS_UNIX
+      if (!(spins % 8)) /* donate a few cycles */
+         sched_yield();
+#endif
+   } while (spins < NOUVEAU_FENCE_MAX_SPINS);
+
+   debug_printf("Wait on fence %u (ack = %u, next = %u) timed out !\n",
+                fence->sequence,
+                screen->fence.sequence_ack, screen->fence.sequence);
+
+   return FALSE;
+}
+
+void
+nouveau_fence_next(struct nouveau_screen *screen)
+{
+   nouveau_fence_emit(screen->fence.current);
+   nouveau_fence_new(screen, &screen->fence.current, FALSE);
+}
diff --git a/src/gallium/drivers/nouveau/nouveau_fence.h b/src/gallium/drivers/nouveau/nouveau_fence.h
new file mode 100644
index 0000000000..785fc8d2a0
--- /dev/null
+++ b/src/gallium/drivers/nouveau/nouveau_fence.h
@@ -0,0 +1,58 @@
+
+#ifndef __NOUVEAU_FENCE_H__
+#define __NOUVEAU_FENCE_H__
+
+#include "util/u_inlines.h"
+#include "util/u_double_list.h"
+
+#define NOUVEAU_FENCE_STATE_AVAILABLE 0
+#define NOUVEAU_FENCE_STATE_EMITTED   1
+#define NOUVEAU_FENCE_STATE_FLUSHED   2
+#define NOUVEAU_FENCE_STATE_SIGNALLED 3
+
+struct nouveau_fence_work {
+   struct list_head list;
+   void (*func)(void *);
+   void *data;
+};
+
+struct nouveau_fence {
+   struct nouveau_fence *next;
+   struct nouveau_screen *screen;
+   int state;
+   int ref;
+   uint32_t sequence;
+   struct list_head work;
+};
+
+void nouveau_fence_emit(struct nouveau_fence *);
+void nouveau_fence_del(struct nouveau_fence *);
+
+boolean nouveau_fence_new(struct nouveau_screen *, struct nouveau_fence **,
+                          boolean emit);
+boolean nouveau_fence_work(struct nouveau_fence *, void (*)(void *), void *);
+void    nouveau_fence_update(struct nouveau_screen *, boolean flushed);
+void    nouveau_fence_next(struct nouveau_screen *);
+boolean nouveau_fence_wait(struct nouveau_fence *);
+boolean nouveau_fence_signalled(struct nouveau_fence *);
+
+static INLINE void
+nouveau_fence_ref(struct nouveau_fence *fence, struct nouveau_fence **ref)
+{
+   if (*ref) {
+      if (--(*ref)->ref == 0)
+         nouveau_fence_del(*ref);
+   }
+   if (fence)
+      ++fence->ref;
+
+   *ref = fence;
+}
+
+static INLINE struct nouveau_fence *
+nouveau_fence(struct pipe_fence_handle *fence)
+{
+   return (struct nouveau_fence *)fence;
+}
+
+#endif // __NOUVEAU_FENCE_H__
diff --git a/src/gallium/drivers/nouveau/nouveau_screen.c b/src/gallium/drivers/nouveau/nouveau_screen.c
index a9426df686..e14f2346a3 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.c
+++ b/src/gallium/drivers/nouveau/nouveau_screen.c
@@ -14,6 +14,7 @@
 #include "nouveau/nouveau_bo.h"
 #include "nouveau_winsys.h"
 #include "nouveau_screen.h"
+#include "nouveau_fence.h"
 
 /* XXX this should go away */
 #include "state_tracker/drm_driver.h"
@@ -150,7 +151,7 @@ nouveau_screen_fence_ref(struct pipe_screen *pscreen,
 			 struct pipe_fence_handle **ptr,
 			 struct pipe_fence_handle *pfence)
 {
-	*ptr = pfence;
+	nouveau_fence_ref(nouveau_fence(pfence), (struct nouveau_fence **)ptr);
 }
 
 static int
@@ -158,7 +159,7 @@ nouveau_screen_fence_signalled(struct pipe_screen *screen,
 			       struct pipe_fence_handle *pfence,
 			       unsigned flags)
 {
-	return 0;
+	return !nouveau_fence_signalled(nouveau_fence(pfence));
 }
 
 static int
@@ -166,7 +167,7 @@ nouveau_screen_fence_finish(struct pipe_screen *screen,
 			    struct pipe_fence_handle *pfence,
 			    unsigned flags)
 {
-	return 0;
+	return !nouveau_fence_wait(nouveau_fence(pfence));
 }
 
 
diff --git a/src/gallium/drivers/nouveau/nouveau_screen.h b/src/gallium/drivers/nouveau/nouveau_screen.h
index 1f4e5171c0..e4a460ec65 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.h
+++ b/src/gallium/drivers/nouveau/nouveau_screen.h
@@ -2,6 +2,8 @@
 #define __NOUVEAU_SCREEN_H__
 
 #include "pipe/p_screen.h"
+#include "util/u_memory.h"
+typedef uint32_t u32;
 
 struct nouveau_screen {
 	struct pipe_screen base;
@@ -12,6 +14,16 @@ struct nouveau_screen {
 	 * these almost always should be set to the same value */
 	unsigned vertex_buffer_flags;
 	unsigned index_buffer_flags;
+
+	struct {
+		struct nouveau_fence *head;
+		struct nouveau_fence *tail;
+		struct nouveau_fence *current;
+		u32 sequence;
+		u32 sequence_ack;
+		void (*emit)(struct pipe_screen *, u32 sequence);
+		u32  (*update)(struct pipe_screen *);
+	} fence;
 };
 
 static INLINE struct nouveau_screen *