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Diffstat (limited to 'src/gallium/drivers/svga/svga_screen_buffer.c')
-rw-r--r--src/gallium/drivers/svga/svga_screen_buffer.c820
1 files changed, 820 insertions, 0 deletions
diff --git a/src/gallium/drivers/svga/svga_screen_buffer.c b/src/gallium/drivers/svga/svga_screen_buffer.c
new file mode 100644
index 0000000000..3b7811734e
--- /dev/null
+++ b/src/gallium/drivers/svga/svga_screen_buffer.c
@@ -0,0 +1,820 @@
+/**********************************************************
+ * Copyright 2008-2009 VMware, Inc. All rights reserved.
+ *
+ * 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 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.
+ *
+ **********************************************************/
+
+#include "svga_cmd.h"
+
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_inlines.h"
+#include "pipe/p_thread.h"
+#include "util/u_math.h"
+#include "util/u_memory.h"
+
+#include "svga_context.h"
+#include "svga_screen.h"
+#include "svga_screen_buffer.h"
+#include "svga_winsys.h"
+#include "svga_debug.h"
+
+
+/**
+ * Vertex and index buffers have to be treated slightly differently from
+ * regular guest memory regions because the SVGA device sees them as
+ * surfaces, and the state tracker can create/destroy without the pipe
+ * driver, therefore we must do the uploads from the vws.
+ */
+static INLINE boolean
+svga_buffer_needs_hw_storage(unsigned usage)
+{
+ return usage & (PIPE_BUFFER_USAGE_VERTEX | PIPE_BUFFER_USAGE_INDEX);
+}
+
+
+static INLINE enum pipe_error
+svga_buffer_create_host_surface(struct svga_screen *ss,
+ struct svga_buffer *sbuf)
+{
+ if(!sbuf->handle) {
+ sbuf->key.flags = 0;
+
+ sbuf->key.format = SVGA3D_BUFFER;
+ if(sbuf->base.usage & PIPE_BUFFER_USAGE_VERTEX)
+ sbuf->key.flags |= SVGA3D_SURFACE_HINT_VERTEXBUFFER;
+ if(sbuf->base.usage & PIPE_BUFFER_USAGE_INDEX)
+ sbuf->key.flags |= SVGA3D_SURFACE_HINT_INDEXBUFFER;
+
+ sbuf->key.size.width = sbuf->base.size;
+ sbuf->key.size.height = 1;
+ sbuf->key.size.depth = 1;
+
+ sbuf->key.numFaces = 1;
+ sbuf->key.numMipLevels = 1;
+
+ sbuf->handle = svga_screen_surface_create(ss, &sbuf->key);
+ if(!sbuf->handle)
+ return PIPE_ERROR_OUT_OF_MEMORY;
+
+ /* Always set the discard flag on the first time the buffer is written
+ * as svga_screen_surface_create might have passed a recycled host
+ * buffer.
+ */
+ sbuf->hw.flags.discard = TRUE;
+
+ SVGA_DBG(DEBUG_DMA, " grab sid %p sz %d\n", sbuf->handle, sbuf->base.size);
+ }
+
+ return PIPE_OK;
+}
+
+
+static INLINE void
+svga_buffer_destroy_host_surface(struct svga_screen *ss,
+ struct svga_buffer *sbuf)
+{
+ if(sbuf->handle) {
+ SVGA_DBG(DEBUG_DMA, " ungrab sid %p sz %d\n", sbuf->handle, sbuf->base.size);
+ svga_screen_surface_destroy(ss, &sbuf->key, &sbuf->handle);
+ }
+}
+
+
+static INLINE void
+svga_buffer_destroy_hw_storage(struct svga_screen *ss, struct svga_buffer *sbuf)
+{
+ struct svga_winsys_screen *sws = ss->sws;
+
+ assert(!sbuf->map.count);
+ assert(sbuf->hw.buf);
+ if(sbuf->hw.buf) {
+ sws->buffer_destroy(sws, sbuf->hw.buf);
+ sbuf->hw.buf = NULL;
+ assert(sbuf->head.prev && sbuf->head.next);
+ LIST_DEL(&sbuf->head);
+#ifdef DEBUG
+ sbuf->head.next = sbuf->head.prev = NULL;
+#endif
+ }
+}
+
+static INLINE enum pipe_error
+svga_buffer_backup(struct svga_screen *ss, struct svga_buffer *sbuf)
+{
+ if (sbuf->hw.buf && sbuf->hw.num_ranges) {
+ void *src;
+
+ if (!sbuf->swbuf)
+ sbuf->swbuf = align_malloc(sbuf->base.size, sbuf->base.alignment);
+ if (!sbuf->swbuf)
+ return PIPE_ERROR_OUT_OF_MEMORY;
+
+ src = ss->sws->buffer_map(ss->sws, sbuf->hw.buf,
+ PIPE_BUFFER_USAGE_CPU_READ);
+ if (!src)
+ return PIPE_ERROR;
+
+ memcpy(sbuf->swbuf, src, sbuf->base.size);
+ ss->sws->buffer_unmap(ss->sws, sbuf->hw.buf);
+ }
+
+ return PIPE_OK;
+}
+
+/**
+ * Try to make GMR space available by freeing the hardware storage of
+ * unmapped
+ */
+boolean
+svga_buffer_free_cached_hw_storage(struct svga_screen *ss)
+{
+ struct list_head *curr;
+ struct svga_buffer *sbuf;
+ enum pipe_error ret = PIPE_OK;
+
+ curr = ss->cached_buffers.prev;
+
+ /* free the least recently used buffer's hw storage which is not mapped */
+ do {
+ if(curr == &ss->cached_buffers)
+ return FALSE;
+
+ sbuf = LIST_ENTRY(struct svga_buffer, curr, head);
+
+ curr = curr->prev;
+ if (sbuf->map.count == 0)
+ ret = svga_buffer_backup(ss, sbuf);
+
+ } while(sbuf->map.count != 0 || ret != PIPE_OK);
+
+ svga_buffer_destroy_hw_storage(ss, sbuf);
+
+ return TRUE;
+}
+
+struct svga_winsys_buffer *
+svga_winsys_buffer_create( struct svga_screen *ss,
+ unsigned alignment,
+ unsigned usage,
+ unsigned size )
+{
+ struct svga_winsys_screen *sws = ss->sws;
+ struct svga_winsys_buffer *buf;
+
+ /* Just try */
+ buf = sws->buffer_create(sws, alignment, usage, size);
+ if(!buf) {
+
+ SVGA_DBG(DEBUG_DMA|DEBUG_PERF, "flushing screen to find %d bytes GMR\n",
+ size);
+
+ /* Try flushing all pending DMAs */
+ svga_screen_flush(ss, NULL);
+ buf = sws->buffer_create(sws, alignment, usage, size);
+
+ SVGA_DBG(DEBUG_DMA|DEBUG_PERF, "evicting buffers to find %d bytes GMR\n",
+ size);
+
+ /* Try evicing all buffer storage */
+ while(!buf && svga_buffer_free_cached_hw_storage(ss))
+ buf = sws->buffer_create(sws, alignment, usage, size);
+ }
+
+ return buf;
+}
+
+
+/**
+ * Allocate DMA'ble storage for the buffer.
+ *
+ * Called before mapping a buffer.
+ */
+static INLINE enum pipe_error
+svga_buffer_create_hw_storage(struct svga_screen *ss,
+ struct svga_buffer *sbuf)
+{
+ if(!sbuf->hw.buf) {
+ unsigned alignment = sbuf->base.alignment;
+ unsigned usage = 0;
+ unsigned size = sbuf->base.size;
+
+ sbuf->hw.buf = svga_winsys_buffer_create(ss, alignment, usage, size);
+ if(!sbuf->hw.buf)
+ return PIPE_ERROR_OUT_OF_MEMORY;
+
+ assert(!sbuf->needs_flush);
+ assert(!sbuf->head.prev && !sbuf->head.next);
+ LIST_ADD(&sbuf->head, &ss->cached_buffers);
+ }
+
+ return PIPE_OK;
+}
+
+
+/**
+ * Variant of SVGA3D_BufferDMA which leaves the copy box temporarily in blank.
+ */
+static enum pipe_error
+svga_buffer_upload_command(struct svga_context *svga,
+ struct svga_buffer *sbuf)
+{
+ struct svga_winsys_context *swc = svga->swc;
+ struct svga_winsys_buffer *guest = sbuf->hw.buf;
+ struct svga_winsys_surface *host = sbuf->handle;
+ SVGA3dTransferType transfer = SVGA3D_WRITE_HOST_VRAM;
+ SVGA3dSurfaceDMAFlags flags = sbuf->hw.flags;
+ SVGA3dCmdSurfaceDMA *cmd;
+ uint32 numBoxes = sbuf->hw.num_ranges;
+ SVGA3dCopyBox *boxes;
+ SVGA3dCmdSurfaceDMASuffix *pSuffix;
+ unsigned region_flags;
+ unsigned surface_flags;
+ struct pipe_buffer *dummy;
+
+ if(transfer == SVGA3D_WRITE_HOST_VRAM) {
+ region_flags = PIPE_BUFFER_USAGE_GPU_READ;
+ surface_flags = PIPE_BUFFER_USAGE_GPU_WRITE;
+ }
+ else if(transfer == SVGA3D_READ_HOST_VRAM) {
+ region_flags = PIPE_BUFFER_USAGE_GPU_WRITE;
+ surface_flags = PIPE_BUFFER_USAGE_GPU_READ;
+ }
+ else {
+ assert(0);
+ return PIPE_ERROR_BAD_INPUT;
+ }
+
+ assert(numBoxes);
+
+ cmd = SVGA3D_FIFOReserve(swc,
+ SVGA_3D_CMD_SURFACE_DMA,
+ sizeof *cmd + numBoxes * sizeof *boxes + sizeof *pSuffix,
+ 2);
+ if(!cmd)
+ return PIPE_ERROR_OUT_OF_MEMORY;
+
+ swc->region_relocation(swc, &cmd->guest.ptr, guest, 0, region_flags);
+ cmd->guest.pitch = 0;
+
+ swc->surface_relocation(swc, &cmd->host.sid, host, surface_flags);
+ cmd->host.face = 0;
+ cmd->host.mipmap = 0;
+
+ cmd->transfer = transfer;
+
+ sbuf->hw.boxes = (SVGA3dCopyBox *)&cmd[1];
+ sbuf->hw.svga = svga;
+
+ /* Increment reference count */
+ dummy = NULL;
+ pipe_buffer_reference(&dummy, &sbuf->base);
+
+ pSuffix = (SVGA3dCmdSurfaceDMASuffix *)((uint8_t*)cmd + sizeof *cmd + numBoxes * sizeof *boxes);
+ pSuffix->suffixSize = sizeof *pSuffix;
+ pSuffix->maximumOffset = sbuf->base.size;
+ pSuffix->flags = flags;
+
+ swc->commit(swc);
+
+ return PIPE_OK;
+}
+
+
+/**
+ * Patch up the upload DMA command reserved by svga_buffer_upload_command
+ * with the final ranges.
+ */
+static void
+svga_buffer_upload_flush(struct svga_context *svga,
+ struct svga_buffer *sbuf)
+{
+ struct svga_screen *ss = svga_screen(svga->pipe.screen);
+ SVGA3dCopyBox *boxes;
+ unsigned i;
+
+ assert(sbuf->handle);
+ assert(sbuf->hw.buf);
+ assert(sbuf->hw.num_ranges);
+ assert(sbuf->hw.svga == svga);
+ assert(sbuf->hw.boxes);
+
+ /*
+ * Patch the DMA command with the final copy box.
+ */
+
+ SVGA_DBG(DEBUG_DMA, "dma to sid %p\n", sbuf->handle);
+
+ boxes = sbuf->hw.boxes;
+ for(i = 0; i < sbuf->hw.num_ranges; ++i) {
+ SVGA_DBG(DEBUG_DMA, " bytes %u - %u\n",
+ sbuf->hw.ranges[i].start, sbuf->hw.ranges[i].end);
+
+ boxes[i].x = sbuf->hw.ranges[i].start;
+ boxes[i].y = 0;
+ boxes[i].z = 0;
+ boxes[i].w = sbuf->hw.ranges[i].end - sbuf->hw.ranges[i].start;
+ boxes[i].h = 1;
+ boxes[i].d = 1;
+ boxes[i].srcx = sbuf->hw.ranges[i].start;
+ boxes[i].srcy = 0;
+ boxes[i].srcz = 0;
+ }
+
+ sbuf->hw.num_ranges = 0;
+ memset(&sbuf->hw.flags, 0, sizeof sbuf->hw.flags);
+
+ assert(sbuf->head.prev && sbuf->head.next);
+ LIST_DEL(&sbuf->head);
+ sbuf->needs_flush = FALSE;
+ /* XXX: do we care about cached_buffers any more ?*/
+ LIST_ADD(&sbuf->head, &ss->cached_buffers);
+
+ sbuf->hw.svga = NULL;
+ sbuf->hw.boxes = NULL;
+
+ /* Decrement reference count */
+ pipe_buffer_reference((struct pipe_buffer **)&sbuf, NULL);
+}
+
+
+/**
+ * Queue a DMA upload of a range of this buffer to the host.
+ *
+ * This function only notes the range down. It doesn't actually emit a DMA
+ * upload command. That only happens when a context tries to refer to this
+ * buffer, and the DMA upload command is added to that context's command buffer.
+ *
+ * We try to lump as many contiguous DMA transfers together as possible.
+ */
+static void
+svga_buffer_upload_queue(struct svga_buffer *sbuf,
+ unsigned start,
+ unsigned end)
+{
+ unsigned i;
+
+ assert(sbuf->hw.buf);
+ assert(end > start);
+
+ /*
+ * Try to grow one of the ranges.
+ *
+ * Note that it is not this function task to care about overlapping ranges,
+ * as the GMR was already given so it is too late to do anything. Situations
+ * where overlapping ranges may pose a problem should be detected via
+ * pipe_context::is_buffer_referenced and the context that refers to the
+ * buffer should be flushed.
+ */
+
+ for(i = 0; i < sbuf->hw.num_ranges; ++i) {
+ if(start <= sbuf->hw.ranges[i].end && sbuf->hw.ranges[i].start <= end) {
+ sbuf->hw.ranges[i].start = MIN2(sbuf->hw.ranges[i].start, start);
+ sbuf->hw.ranges[i].end = MAX2(sbuf->hw.ranges[i].end, end);
+ return;
+ }
+ }
+
+ /*
+ * We cannot add a new range to an existing DMA command, so patch-up the
+ * pending DMA upload and start clean.
+ */
+
+ if(sbuf->needs_flush)
+ svga_buffer_upload_flush(sbuf->hw.svga, sbuf);
+
+ assert(!sbuf->needs_flush);
+ assert(!sbuf->hw.svga);
+ assert(!sbuf->hw.boxes);
+
+ /*
+ * Add a new range.
+ */
+
+ sbuf->hw.ranges[sbuf->hw.num_ranges].start = start;
+ sbuf->hw.ranges[sbuf->hw.num_ranges].end = end;
+ ++sbuf->hw.num_ranges;
+}
+
+
+static void *
+svga_buffer_map_range( struct pipe_screen *screen,
+ struct pipe_buffer *buf,
+ unsigned offset, unsigned length,
+ unsigned usage )
+{
+ struct svga_screen *ss = svga_screen(screen);
+ struct svga_winsys_screen *sws = ss->sws;
+ struct svga_buffer *sbuf = svga_buffer( buf );
+ void *map;
+
+ if(sbuf->swbuf) {
+ /* User/malloc buffer */
+ map = sbuf->swbuf;
+ }
+ else {
+ if(!sbuf->hw.buf) {
+ struct svga_winsys_surface *handle = sbuf->handle;
+
+ if(svga_buffer_create_hw_storage(ss, sbuf) != PIPE_OK)
+ return NULL;
+
+ /* Populate the hardware storage if the host surface pre-existed */
+ if((usage & PIPE_BUFFER_USAGE_CPU_READ) && handle) {
+ SVGA3dSurfaceDMAFlags flags;
+ enum pipe_error ret;
+ struct pipe_fence_handle *fence = NULL;
+
+ SVGA_DBG(DEBUG_DMA|DEBUG_PERF, "dma from sid %p, bytes %u - %u\n",
+ sbuf->handle, 0, sbuf->base.size);
+
+ memset(&flags, 0, sizeof flags);
+
+ ret = SVGA3D_BufferDMA(ss->swc,
+ sbuf->hw.buf,
+ sbuf->handle,
+ SVGA3D_READ_HOST_VRAM,
+ sbuf->base.size,
+ 0,
+ flags);
+ if(ret != PIPE_OK) {
+ ss->swc->flush(ss->swc, NULL);
+
+ ret = SVGA3D_BufferDMA(ss->swc,
+ sbuf->hw.buf,
+ sbuf->handle,
+ SVGA3D_READ_HOST_VRAM,
+ sbuf->base.size,
+ 0,
+ flags);
+ assert(ret == PIPE_OK);
+ }
+
+ ss->swc->flush(ss->swc, &fence);
+ sws->fence_finish(sws, fence, 0);
+ sws->fence_reference(sws, &fence, NULL);
+ }
+ }
+ else {
+ if((usage & PIPE_BUFFER_USAGE_CPU_READ) && !sbuf->needs_flush) {
+ /* We already had the hardware storage but we would have to issue
+ * a download if we hadn't, so move the buffer to the begginning
+ * of the LRU list.
+ */
+ assert(sbuf->head.prev && sbuf->head.next);
+ LIST_DEL(&sbuf->head);
+ LIST_ADD(&sbuf->head, &ss->cached_buffers);
+ }
+ }
+
+ map = sws->buffer_map(sws, sbuf->hw.buf, usage);
+ }
+
+ if(map) {
+ pipe_mutex_lock(ss->swc_mutex);
+
+ ++sbuf->map.count;
+
+ if (usage & PIPE_BUFFER_USAGE_CPU_WRITE) {
+ assert(sbuf->map.count <= 1);
+ sbuf->map.writing = TRUE;
+ if (usage & PIPE_BUFFER_USAGE_FLUSH_EXPLICIT)
+ sbuf->map.flush_explicit = TRUE;
+ }
+
+ pipe_mutex_unlock(ss->swc_mutex);
+ }
+
+ return map;
+}
+
+static void
+svga_buffer_flush_mapped_range( struct pipe_screen *screen,
+ struct pipe_buffer *buf,
+ unsigned offset, unsigned length)
+{
+ struct svga_buffer *sbuf = svga_buffer( buf );
+ struct svga_screen *ss = svga_screen(screen);
+
+ pipe_mutex_lock(ss->swc_mutex);
+ assert(sbuf->map.writing);
+ if(sbuf->map.writing) {
+ assert(sbuf->map.flush_explicit);
+ if(sbuf->hw.buf)
+ svga_buffer_upload_queue(sbuf, offset, offset + length);
+ }
+ pipe_mutex_unlock(ss->swc_mutex);
+}
+
+static void
+svga_buffer_unmap( struct pipe_screen *screen,
+ struct pipe_buffer *buf)
+{
+ struct svga_screen *ss = svga_screen(screen);
+ struct svga_winsys_screen *sws = ss->sws;
+ struct svga_buffer *sbuf = svga_buffer( buf );
+
+ pipe_mutex_lock(ss->swc_mutex);
+
+ assert(sbuf->map.count);
+ if(sbuf->map.count)
+ --sbuf->map.count;
+
+ if(sbuf->hw.buf)
+ sws->buffer_unmap(sws, sbuf->hw.buf);
+
+ if(sbuf->map.writing) {
+ if(!sbuf->map.flush_explicit) {
+ /* No mapped range was flushed -- flush the whole buffer */
+ SVGA_DBG(DEBUG_DMA, "flushing the whole buffer\n");
+
+ if(sbuf->hw.buf)
+ svga_buffer_upload_queue(sbuf, 0, sbuf->base.size);
+ }
+
+ sbuf->map.writing = FALSE;
+ sbuf->map.flush_explicit = FALSE;
+ }
+
+ pipe_mutex_unlock(ss->swc_mutex);
+}
+
+static void
+svga_buffer_destroy( struct pipe_buffer *buf )
+{
+ struct svga_screen *ss = svga_screen(buf->screen);
+ struct svga_buffer *sbuf = svga_buffer( buf );
+
+ assert(!p_atomic_read(&buf->reference.count));
+
+ assert(!sbuf->needs_flush);
+
+ if(sbuf->handle) {
+ SVGA_DBG(DEBUG_DMA, "release sid %p sz %d\n", sbuf->handle, sbuf->base.size);
+ svga_screen_surface_destroy(ss, &sbuf->key, &sbuf->handle);
+ }
+
+ if(sbuf->hw.buf)
+ svga_buffer_destroy_hw_storage(ss, sbuf);
+
+ if(sbuf->swbuf && !sbuf->user)
+ align_free(sbuf->swbuf);
+
+ FREE(sbuf);
+}
+
+static struct pipe_buffer *
+svga_buffer_create(struct pipe_screen *screen,
+ unsigned alignment,
+ unsigned usage,
+ unsigned size)
+{
+ struct svga_screen *ss = svga_screen(screen);
+ struct svga_buffer *sbuf;
+
+ sbuf = CALLOC_STRUCT(svga_buffer);
+ if(!sbuf)
+ goto error1;
+
+ sbuf->magic = SVGA_BUFFER_MAGIC;
+
+ pipe_reference_init(&sbuf->base.reference, 1);
+ sbuf->base.screen = screen;
+ sbuf->base.alignment = alignment;
+ sbuf->base.usage = usage;
+ sbuf->base.size = size;
+
+ if(svga_buffer_needs_hw_storage(usage)) {
+ if(svga_buffer_create_host_surface(ss, sbuf) != PIPE_OK)
+ goto error2;
+ }
+ else {
+ if(alignment < sizeof(void*))
+ alignment = sizeof(void*);
+
+ usage |= PIPE_BUFFER_USAGE_CPU_READ_WRITE;
+
+ sbuf->swbuf = align_malloc(size, alignment);
+ if(!sbuf->swbuf)
+ goto error2;
+ }
+
+ return &sbuf->base;
+
+error2:
+ FREE(sbuf);
+error1:
+ return NULL;
+}
+
+static struct pipe_buffer *
+svga_user_buffer_create(struct pipe_screen *screen,
+ void *ptr,
+ unsigned bytes)
+{
+ struct svga_buffer *sbuf;
+
+ sbuf = CALLOC_STRUCT(svga_buffer);
+ if(!sbuf)
+ goto no_sbuf;
+
+ sbuf->magic = SVGA_BUFFER_MAGIC;
+
+ sbuf->swbuf = ptr;
+ sbuf->user = TRUE;
+
+ pipe_reference_init(&sbuf->base.reference, 1);
+ sbuf->base.screen = screen;
+ sbuf->base.alignment = 1;
+ sbuf->base.usage = 0;
+ sbuf->base.size = bytes;
+
+ return &sbuf->base;
+
+no_sbuf:
+ return NULL;
+}
+
+
+void
+svga_screen_init_buffer_functions(struct pipe_screen *screen)
+{
+ screen->buffer_create = svga_buffer_create;
+ screen->user_buffer_create = svga_user_buffer_create;
+ screen->buffer_map_range = svga_buffer_map_range;
+ screen->buffer_flush_mapped_range = svga_buffer_flush_mapped_range;
+ screen->buffer_unmap = svga_buffer_unmap;
+ screen->buffer_destroy = svga_buffer_destroy;
+}
+
+
+/**
+ * Copy the contents of the user buffer / malloc buffer to a hardware buffer.
+ */
+static INLINE enum pipe_error
+svga_buffer_update_hw(struct svga_screen *ss, struct svga_buffer *sbuf)
+{
+ if(!sbuf->hw.buf) {
+ enum pipe_error ret;
+ void *map;
+
+ assert(sbuf->swbuf);
+ if(!sbuf->swbuf)
+ return PIPE_ERROR;
+
+ ret = svga_buffer_create_hw_storage(ss, sbuf);
+ assert(ret == PIPE_OK);
+ if(ret != PIPE_OK)
+ return ret;
+
+ pipe_mutex_lock(ss->swc_mutex);
+ map = ss->sws->buffer_map(ss->sws, sbuf->hw.buf, PIPE_BUFFER_USAGE_CPU_WRITE);
+ assert(map);
+ if(!map) {
+ pipe_mutex_unlock(ss->swc_mutex);
+ return PIPE_ERROR_OUT_OF_MEMORY;
+ }
+
+ memcpy(map, sbuf->swbuf, sbuf->base.size);
+ ss->sws->buffer_unmap(ss->sws, sbuf->hw.buf);
+
+ /* This user/malloc buffer is now indistinguishable from a gpu buffer */
+ assert(!sbuf->map.count);
+ if(!sbuf->map.count) {
+ if(sbuf->user)
+ sbuf->user = FALSE;
+ else
+ align_free(sbuf->swbuf);
+ sbuf->swbuf = NULL;
+ }
+
+ svga_buffer_upload_queue(sbuf, 0, sbuf->base.size);
+ }
+
+ pipe_mutex_unlock(ss->swc_mutex);
+ return PIPE_OK;
+}
+
+
+struct svga_winsys_surface *
+svga_buffer_handle(struct svga_context *svga,
+ struct pipe_buffer *buf)
+{
+ struct pipe_screen *screen = svga->pipe.screen;
+ struct svga_screen *ss = svga_screen(screen);
+ struct svga_buffer *sbuf;
+ enum pipe_error ret;
+
+ if(!buf)
+ return NULL;
+
+ sbuf = svga_buffer(buf);
+
+ assert(!sbuf->map.count);
+
+ if(!sbuf->handle) {
+ ret = svga_buffer_create_host_surface(ss, sbuf);
+ if(ret != PIPE_OK)
+ return NULL;
+
+ ret = svga_buffer_update_hw(ss, sbuf);
+ if(ret != PIPE_OK)
+ return NULL;
+ }
+
+ if(!sbuf->needs_flush && sbuf->hw.num_ranges) {
+ /* Queue the buffer for flushing */
+ ret = svga_buffer_upload_command(svga, sbuf);
+ if(ret != PIPE_OK)
+ /* XXX: Should probably have a richer return value */
+ return NULL;
+
+ assert(sbuf->hw.svga == svga);
+
+ sbuf->needs_flush = TRUE;
+ assert(sbuf->head.prev && sbuf->head.next);
+ LIST_DEL(&sbuf->head);
+ LIST_ADDTAIL(&sbuf->head, &svga->dirty_buffers);
+ }
+
+ return sbuf->handle;
+}
+
+struct pipe_buffer *
+svga_screen_buffer_wrap_surface(struct pipe_screen *screen,
+ enum SVGA3dSurfaceFormat format,
+ struct svga_winsys_surface *srf)
+{
+ struct pipe_buffer *buf;
+ struct svga_buffer *sbuf;
+ struct svga_winsys_screen *sws = svga_winsys_screen(screen);
+
+ buf = svga_buffer_create(screen, 0, SVGA_BUFFER_USAGE_WRAPPED, 0);
+ if (!buf)
+ return NULL;
+
+ sbuf = svga_buffer(buf);
+
+ /*
+ * We are not the creator of this surface and therefore we must not
+ * cache it for reuse. The caching code only caches SVGA3D_BUFFER surfaces
+ * so make sure this isn't one of those.
+ */
+
+ assert(format != SVGA3D_BUFFER);
+ sbuf->key.format = format;
+ sws->surface_reference(sws, &sbuf->handle, srf);
+
+ return buf;
+}
+
+
+struct svga_winsys_surface *
+svga_screen_buffer_get_winsys_surface(struct pipe_buffer *buffer)
+{
+ struct svga_winsys_screen *sws = svga_winsys_screen(buffer->screen);
+ struct svga_winsys_surface *vsurf = NULL;
+
+ sws->surface_reference(sws, &vsurf, svga_buffer(buffer)->handle);
+ return vsurf;
+}
+
+void
+svga_context_flush_buffers(struct svga_context *svga)
+{
+ struct list_head *curr, *next;
+ struct svga_buffer *sbuf;
+
+ curr = svga->dirty_buffers.next;
+ next = curr->next;
+ while(curr != &svga->dirty_buffers) {
+ sbuf = LIST_ENTRY(struct svga_buffer, curr, head);
+
+ assert(p_atomic_read(&sbuf->base.reference.count) != 0);
+ assert(sbuf->needs_flush);
+
+ svga_buffer_upload_flush(svga, sbuf);
+
+ curr = next;
+ next = curr->next;
+ }
+}