nouveau: Initial buffer object support

1 files changed, 272 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
new file mode 100644
index 00000000000..d36196aeef2
--- /dev/null
+++ b/src/mesa/drivers/dri/nouveau/nouveau_bufferobj.c
@@ -0,0 +1,272 @@
+#include "bufferobj.h"
+#include "enums.h"
+
+#include "nouveau_bufferobj.h"
+#include "nouveau_buffers.h"
+#include "nouveau_context.h"
+#include "nouveau_drm.h"
+#include "nouveau_object.h"
+#include "nouveau_msg.h"
+
+#define DEBUG(fmt,args...) do {                \
+	if (NOUVEAU_DEBUG & DEBUG_BUFFEROBJ) { \
+		fprintf(stderr, "%s: "fmt, __func__, ##args);  \
+	}                                      \
+} while(0)
+
+/* Wrapper for nouveau_mem_gpu_offset_get() that marks the bufferobj dirty
+ * if the GPU modifies the data.
+ */
+uint32_t
+nouveau_bufferobj_gpu_ref(GLcontext *ctx, GLenum access,
+			  struct gl_buffer_object *obj)
+{
+	nouveau_buffer_object *nbo = (nouveau_buffer_object *)obj;
+
+	DEBUG("obj=%p, access=%s\n", obj, _mesa_lookup_enum_by_nr(access));
+
+	if (access == GL_WRITE_ONLY_ARB || access == GL_READ_WRITE_ARB)
+		nbo->gpu_dirty = GL_TRUE;
+
+	return nouveau_mem_gpu_offset_get(ctx, nbo->gpu_mem);
+}
+
+static void
+nouveauBindBuffer(GLcontext *ctx, GLenum target, struct gl_buffer_object *obj)
+{
+}
+
+static struct gl_buffer_object *
+nouveauNewBufferObject(GLcontext *ctx, GLuint buffer, GLenum target)
+{
+	nouveau_buffer_object *nbo;
+
+	nbo = CALLOC_STRUCT(nouveau_buffer_object_t);
+	DEBUG("name=0x%08x, target=%s, obj=%p\n",
+			buffer, _mesa_lookup_enum_by_nr(target), nbo);
+	_mesa_initialize_buffer_object(&nbo->mesa, buffer, target);
+	return &nbo->mesa;
+}
+
+static void
+nouveauDeleteBuffer(GLcontext *ctx, struct gl_buffer_object *obj)
+{
+	nouveau_buffer_object *nbo = (nouveau_buffer_object *)obj;
+
+	DEBUG("obj=%p\n", obj);
+
+	if (nbo->gpu_mem) {
+		nouveau_mem_free(ctx, nbo->gpu_mem);
+	}
+	_mesa_delete_buffer_object(ctx, obj);
+}
+
+static void
+nouveauBufferData(GLcontext *ctx, GLenum target, GLsizeiptrARB size,
+		  const GLvoid *data, GLenum usage,
+		  struct gl_buffer_object *obj)
+{
+	nouveau_buffer_object *nbo = (nouveau_buffer_object *)obj;
+
+	DEBUG("obj=%p, target=%s, usage=%s, size=%d, data=%p\n",
+			obj,
+			_mesa_lookup_enum_by_nr(target),
+			_mesa_lookup_enum_by_nr(usage),
+			(unsigned int)size,
+			data);
+
+	if (nbo->gpu_mem && nbo->gpu_mem->size != size)
+		nouveau_mem_free(ctx, nbo->gpu_mem);
+
+	/* Always have the GPU access the data from VRAM if possible.  For
+	 * some "usage" values it may be better from AGP be default?
+	 *
+	 * TODO: At some point we should drop the NOUVEAU_MEM_MAPPED flag.
+	 * TODO: Use the NOUVEAU_MEM_AGP_ACCEPTABLE flag.
+	 * TODO: What about PCI-E and shared system memory?
+	 */
+	if (!nbo->gpu_mem)
+		nbo->gpu_mem = nouveau_mem_alloc(ctx,
+						 NOUVEAU_MEM_FB |
+						 NOUVEAU_MEM_MAPPED,
+						 size,
+						 0);
+
+	if (!nbo->gpu_mem) {
+		MESSAGE("AIII bufferobj malloc failed\n");
+		return;
+	}
+
+	obj->Usage = usage;
+	obj->Size  = size;
+	if (!data)
+		return;
+
+	ctx->Driver.MapBuffer(ctx, target, GL_WRITE_ONLY_ARB, obj);
+	_mesa_memcpy(nbo->cpu_mem->map, data, size);
+	ctx->Driver.UnmapBuffer(ctx, target, obj);
+}
+
+/*TODO: we don't need to DMA the entire buffer like MapBuffer does.. */
+static void
+nouveauBufferSubData(GLcontext *ctx, GLenum target, GLintptrARB offset,
+		     GLsizeiptrARB size, const GLvoid *data,
+		     struct gl_buffer_object *obj)
+{
+	DEBUG("obj=%p, target=%s, offset=0x%x, size=%d, data=%p\n",
+			obj,
+			_mesa_lookup_enum_by_nr(target),
+			(unsigned int)offset,
+			(unsigned int)size,
+			data);
+
+	ctx->Driver.MapBuffer(ctx, target, GL_WRITE_ONLY_ARB, obj);
+	_mesa_memcpy((GLubyte *)obj->Pointer + offset, data, size);
+	ctx->Driver.UnmapBuffer(ctx, target, obj);
+}
+
+/*TODO: we don't need to DMA the entire buffer like MapBuffer does.. */
+static void
+nouveauGetBufferSubData(GLcontext *ctx, GLenum target, GLintptrARB offset,
+		     GLsizeiptrARB size, GLvoid *data,
+		     struct gl_buffer_object *obj)
+{
+	DEBUG("obj=%p, target=%s, offset=0x%x, size=%d, data=%p\n",
+			obj,
+			_mesa_lookup_enum_by_nr(target),
+			(unsigned int)offset,
+			(unsigned int)size,
+			data);
+
+	ctx->Driver.MapBuffer(ctx, target, GL_READ_ONLY_ARB, obj);
+	_mesa_memcpy(data, (GLubyte *)obj->Pointer + offset, size);
+	ctx->Driver.UnmapBuffer(ctx, target, obj);
+}
+
+static void *
+nouveauMapBuffer(GLcontext *ctx, GLenum target, GLenum access,
+		 struct gl_buffer_object *obj)
+{
+	nouveauContextPtr nmesa = NOUVEAU_CONTEXT(ctx);
+	nouveau_buffer_object *nbo = (nouveau_buffer_object *)obj;
+
+	DEBUG("obj=%p, target=%s, access=%s\n",
+			obj,
+			_mesa_lookup_enum_by_nr(target),
+			_mesa_lookup_enum_by_nr(access));
+
+	if (obj->Pointer) {
+		DEBUG("already mapped, return NULL\n");
+		return NULL;
+	}
+
+#ifdef ALLOW_MULTI_SUBCHANNEL
+	/* If GPU is accessing the data from VRAM, copy to faster AGP memory
+	 * before CPU access to the buffer.
+	 */
+	if (nbo->gpu_mem->type & NOUVEAU_MEM_FB) {
+		DEBUG("Data in VRAM, copying to AGP for CPU access\n");
+
+		/* This can happen if BufferData grows the GPU-access buffer */
+		if (nbo->cpu_mem && nbo->cpu_mem->size != nbo->gpu_mem->size) {
+			nouveau_mem_free(ctx, nbo->cpu_mem);
+			nbo->cpu_mem = NULL;
+		}
+
+		if (!nbo->cpu_mem) {
+			nbo->cpu_mem = nouveau_mem_alloc(ctx,
+							 NOUVEAU_MEM_AGP |
+							 NOUVEAU_MEM_MAPPED,
+							 nbo->gpu_mem->size,
+							 0);
+
+			/* Mark GPU data as modified, so it gets copied to
+			 * the new buffer */
+			nbo->gpu_dirty = GL_TRUE;
+		}
+
+		if (nbo->cpu_mem && nbo->gpu_dirty) {
+			nouveau_memformat_flat_emit(ctx, nbo->cpu_mem,
+							 nbo->gpu_mem,
+							 0, 0,
+							 nbo->gpu_mem->size);
+
+			nouveau_notifier_wait_nop(ctx,
+						  nmesa->syncNotifier,
+						  NvSubMemFormat);
+			nbo->gpu_dirty = GL_FALSE;
+		}
+
+		/* buffer isn't guaranteed to be up-to-date on the card now */
+		nbo->cpu_dirty = GL_TRUE;
+	}
+#endif
+
+	/* If the copy to AGP failed for some reason, just return a pointer
+	 * directly to vram..
+	 */
+	if (!nbo->cpu_mem) {
+		DEBUG("Returning direct pointer to VRAM\n");
+		nbo->cpu_mem   = nbo->gpu_mem;
+		nbo->cpu_dirty = GL_FALSE;
+	}
+
+	obj->Pointer = nbo->cpu_mem->map;
+	return obj->Pointer;
+}
+
+static GLboolean
+nouveauUnmapBuffer(GLcontext *ctx, GLenum target, struct gl_buffer_object *obj)
+{
+	nouveauContextPtr nmesa = NOUVEAU_CONTEXT(ctx);
+	nouveau_buffer_object *nbo = (nouveau_buffer_object *)obj;
+
+	DEBUG("obj=%p, target=%s\n", obj, _mesa_lookup_enum_by_nr(target));
+
+#ifdef ALLOW_MULTI_SUBCHANNEL
+	if (nbo->cpu_dirty && nbo->cpu_mem != nbo->gpu_mem) {
+		DEBUG("Copying potentially modified data back to GPU\n");
+
+		/* blit from GPU buffer -> CPU  buffer */
+		nouveau_memformat_flat_emit(ctx, nbo->gpu_mem, nbo->cpu_mem,
+		      			    0, 0, nbo->cpu_mem->size);
+
+		/* buffer is now up-to-date on the hardware (or rather, will
+		 * be by the time any other commands in this channel reference
+		 * the data.)
+		 */
+		nbo->cpu_dirty = GL_FALSE;
+
+		/* we can avoid this wait in some cases.. */
+		nouveau_notifier_wait_nop(ctx,
+					  nmesa->syncNotifier,
+					  NvSubMemFormat);
+
+		/* If it's likely CPU access to the buffer will occur often,
+		 * keep the cpu_mem around to avoid repeated allocs.
+		 */
+		if (obj->Usage != GL_DYNAMIC_DRAW_ARB) {
+
+			nouveau_mem_free(ctx, nbo->cpu_mem);
+			nbo->cpu_mem = NULL;
+		}
+	}
+#endif
+
+	obj->Pointer = NULL;
+	return GL_TRUE;
+}
+	  
+void
+nouveauInitBufferObjects(GLcontext *ctx)
+{
+	ctx->Driver.BindBuffer		= nouveauBindBuffer;
+	ctx->Driver.NewBufferObject	= nouveauNewBufferObject;
+	ctx->Driver.DeleteBuffer	= nouveauDeleteBuffer;
+	ctx->Driver.BufferData		= nouveauBufferData;
+	ctx->Driver.BufferSubData	= nouveauBufferSubData;
+	ctx->Driver.GetBufferSubData	= nouveauGetBufferSubData;
+	ctx->Driver.MapBuffer		= nouveauMapBuffer;
+	ctx->Driver.UnmapBuffer		= nouveauUnmapBuffer;
+}
+