From b560ed2444383b9634786fe742b8cb6f5cdfc781 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <skeggsb@gmail.com>
Date: Sun, 2 Mar 2008 14:56:42 +1100
Subject: nouveau: enable multi-context/single-channel support for nv40

---
 src/gallium/winsys/dri/nouveau/nouveau_context.c | 63 +++++++++++++++++++++---
 src/gallium/winsys/dri/nouveau/nouveau_context.h |  8 +++
 src/gallium/winsys/dri/nouveau/nouveau_screen.h  |  2 +
 src/gallium/winsys/dri/nouveau/nouveau_winsys.c  | 10 ++--
 4 files changed, 74 insertions(+), 9 deletions(-)

(limited to 'src/gallium/winsys/dri/nouveau')

diff --git a/src/gallium/winsys/dri/nouveau/nouveau_context.c b/src/gallium/winsys/dri/nouveau/nouveau_context.c
index 7915afae22..dc852c9f49 100644
--- a/src/gallium/winsys/dri/nouveau/nouveau_context.c
+++ b/src/gallium/winsys/dri/nouveau/nouveau_context.c
@@ -4,6 +4,7 @@
 #include "utils.h"
 
 #include "state_tracker/st_public.h"
+#include "state_tracker/st_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_context.h"
 
@@ -101,7 +102,8 @@ nouveau_context_create(const __GLcontextModes *glVis,
 	struct nouveau_device_priv *nvdev;
 	struct pipe_context *pipe = NULL;
 	struct st_context *st_share = NULL;
-	int ret;
+	struct nouveau_channel_context *nvc = NULL;
+	int i, ret;
 
 	if (sharedContextPrivate) {
 		st_share = ((struct nouveau_context *)sharedContextPrivate)->st;
@@ -163,12 +165,56 @@ nouveau_context_create(const __GLcontextModes *glVis,
 		nv->frontbuffer = fb_surf;
 	}
 
-	nv->nvc = nouveau_channel_context_create(&nvdev->base, nv->chipset);
-	if (!nv->nvc) {
-		NOUVEAU_ERR("Failed initialising GPU channel context\n");
-		return GL_FALSE;
+	/* Attempt to share a single channel between multiple contexts from
+	 * a single process.
+	 */
+	nvc = nv_screen->nvc;
+	if (!nvc && st_share) {
+		struct nouveau_context *snv = st_share->pipe->priv;
+		if (snv) {
+			nvc = snv->nvc;
+		}
+	}
+
+	/*XXX: temporary - disable multi-context/single-channel on non-NV4x */
+	switch (nv->chipset & 0xf0) {
+	case 0x40:
+	case 0x60:
+		break;
+	default:
+		nvc = NULL;
+		break;
+	}
+
+	if (!nvc) {
+		nvc = nouveau_channel_context_create(&nvdev->base, nv->chipset);
+		if (!nvc) {
+			NOUVEAU_ERR("Failed initialising GPU context\n");
+			return GL_FALSE;
+		}
+		nv_screen->nvc = nvc;
+	}
+
+	nvc->refcount++;
+	nv->nvc = nvc;
+
+	/* Find a free slot for a pipe context, allocate a new one if needed */
+	nv->pctx_id = -1;
+	for (i = 0; i < nvc->nr_pctx; i++) {
+		if (nvc->pctx[i] == NULL) {
+			nv->pctx_id = i;
+			break;
+		}
 	}
 
+	if (nv->pctx_id < 0) {
+		nv->pctx_id = nvc->nr_pctx++;
+		nvc->pctx =
+			realloc(nvc->pctx,
+				sizeof(struct pipe_context *) * nvc->nr_pctx);
+	}
+
+	/* Create pipe */
 	if (nv->chipset < 0x50)
 		ret = nouveau_surface_init_nv04(nv);
 	else
@@ -201,13 +247,18 @@ void
 nouveau_context_destroy(__DRIcontextPrivate *driContextPriv)
 {
 	struct nouveau_context *nv = driContextPriv->driverPrivate;
+	struct nouveau_channel_context *nvc = nv->nvc;
 
 	assert(nv);
 
 	st_flush(nv->st, PIPE_FLUSH_WAIT);
 	st_destroy_context(nv->st);
 
-	nouveau_channel_context_destroy(nv->nvc);
+	if (nv->pctx_id >= 0) {
+		nvc->pctx[nv->pctx_id] = NULL;
+		if (--nvc->refcount <= 0)
+			nouveau_channel_context_destroy(nvc);
+	}
 
 	free(nv);
 }
diff --git a/src/gallium/winsys/dri/nouveau/nouveau_context.h b/src/gallium/winsys/dri/nouveau/nouveau_context.h
index 736c8d8bef..92f551855a 100644
--- a/src/gallium/winsys/dri/nouveau/nouveau_context.h
+++ b/src/gallium/winsys/dri/nouveau/nouveau_context.h
@@ -14,6 +14,13 @@ struct nouveau_framebuffer {
 };
 
 struct nouveau_channel_context {
+	struct pipe_screen *pscreen;
+	int refcount;
+
+	unsigned cur_pctx;
+	unsigned nr_pctx;
+	struct pipe_context **pctx;
+
 	unsigned chipset;
 
 	struct nouveau_channel  *channel;
@@ -51,6 +58,7 @@ struct nouveau_context {
 
 	/* Hardware context */
 	struct nouveau_channel_context *nvc;
+	int pctx_id;
 
 	/* pipe_surface accel */
 	struct pipe_surface *surf_src, *surf_dst;
diff --git a/src/gallium/winsys/dri/nouveau/nouveau_screen.h b/src/gallium/winsys/dri/nouveau/nouveau_screen.h
index 019823bd44..e9da202690 100644
--- a/src/gallium/winsys/dri/nouveau/nouveau_screen.h
+++ b/src/gallium/winsys/dri/nouveau/nouveau_screen.h
@@ -14,6 +14,8 @@ struct nouveau_screen {
 	uint32_t front_pitch;
 	uint32_t front_cpp;
 	uint32_t front_height;
+
+	void *nvc;
 };
 
 #endif
diff --git a/src/gallium/winsys/dri/nouveau/nouveau_winsys.c b/src/gallium/winsys/dri/nouveau/nouveau_winsys.c
index 50d7549b1b..87619bdcfb 100644
--- a/src/gallium/winsys/dri/nouveau/nouveau_winsys.c
+++ b/src/gallium/winsys/dri/nouveau/nouveau_winsys.c
@@ -70,11 +70,12 @@ nouveau_pipe_emit_reloc(struct nouveau_channel *chan, void *ptr,
 struct pipe_context *
 nouveau_pipe_create(struct nouveau_context *nv)
 {
+	struct nouveau_channel_context *nvc = nv->nvc;
 	struct nouveau_winsys *nvws = CALLOC_STRUCT(nouveau_winsys);
 	struct pipe_screen *(*hws_create)(struct pipe_winsys *,
 					  struct nouveau_winsys *,
 					  unsigned chipset);
-	struct pipe_context *(*hw_create)(struct pipe_screen *);
+	struct pipe_context *(*hw_create)(struct pipe_screen *, unsigned);
 	struct pipe_winsys *ws;
 	struct pipe_screen *pscreen;
 
@@ -125,7 +126,10 @@ nouveau_pipe_create(struct nouveau_context *nv)
 	nvws->surface_fill	= nouveau_pipe_surface_fill;
 
 	ws = nouveau_create_pipe_winsys(nv);
-	pscreen = hws_create(ws, nvws, nv->chipset);
-	return hw_create(pscreen);
+
+	if (!nvc->pscreen)
+		nvc->pscreen = hws_create(ws, nvws, nv->chipset);
+	nvc->pctx[nv->pctx_id] = hw_create(nvc->pscreen, nv->pctx_id);
+	return nvc->pctx[nv->pctx_id];
 }
 
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