diff options
Diffstat (limited to 'src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c')
| -rw-r--r-- | src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c | 462 |
1 files changed, 462 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c b/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c new file mode 100644 index 0000000000..17b2781052 --- /dev/null +++ b/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c @@ -0,0 +1,462 @@ +/************************************************************************** + * + * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. + * 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, sub license, 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 NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 + * Implementation of fenced buffers. + * + * \author José Fonseca <jrfonseca-at-tungstengraphics-dot-com> + * \author Thomas Hellström <thomas-at-tungstengraphics-dot-com> + */ + + +#include "pipe/p_config.h" + +#if defined(PIPE_OS_LINUX) +#include <unistd.h> +#include <sched.h> +#endif + +#include "pipe/p_compiler.h" +#include "pipe/p_error.h" +#include "pipe/p_debug.h" +#include "pipe/p_winsys.h" +#include "pipe/p_thread.h" +#include "util/u_memory.h" +#include "util/u_double_list.h" + +#include "pb_buffer.h" +#include "pb_buffer_fenced.h" + + + +/** + * Convenience macro (type safe). + */ +#define SUPER(__derived) (&(__derived)->base) + +#define PIPE_BUFFER_USAGE_CPU_READ_WRITE \ + ( PIPE_BUFFER_USAGE_CPU_READ | PIPE_BUFFER_USAGE_CPU_WRITE ) +#define PIPE_BUFFER_USAGE_GPU_READ_WRITE \ + ( PIPE_BUFFER_USAGE_GPU_READ | PIPE_BUFFER_USAGE_GPU_WRITE ) +#define PIPE_BUFFER_USAGE_WRITE \ + ( PIPE_BUFFER_USAGE_CPU_WRITE | PIPE_BUFFER_USAGE_GPU_WRITE ) + + +struct fenced_buffer_list +{ + pipe_mutex mutex; + + struct pipe_winsys *winsys; + + size_t numDelayed; + + struct list_head delayed; +}; + + +/** + * Wrapper around a pipe buffer which adds fencing and reference counting. + */ +struct fenced_buffer +{ + struct pb_buffer base; + + struct pb_buffer *buffer; + + /* FIXME: protect access with mutex */ + + /** + * A bitmask of PIPE_BUFFER_USAGE_CPU/GPU_READ/WRITE describing the current + * buffer usage. + */ + unsigned flags; + + unsigned mapcount; + struct pipe_fence_handle *fence; + + struct list_head head; + struct fenced_buffer_list *list; +}; + + +static INLINE struct fenced_buffer * +fenced_buffer(struct pb_buffer *buf) +{ + assert(buf); + assert(buf->vtbl == &fenced_buffer_vtbl); + return (struct fenced_buffer *)buf; +} + + +static INLINE void +_fenced_buffer_add(struct fenced_buffer *fenced_buf) +{ + struct fenced_buffer_list *fenced_list = fenced_buf->list; + + assert(fenced_buf->base.base.refcount); + assert(fenced_buf->flags & PIPE_BUFFER_USAGE_GPU_READ_WRITE); + assert(fenced_buf->fence); + + assert(!fenced_buf->head.prev); + assert(!fenced_buf->head.next); + LIST_ADDTAIL(&fenced_buf->head, &fenced_list->delayed); + ++fenced_list->numDelayed; +} + + +/** + * Actually destroy the buffer. + */ +static INLINE void +_fenced_buffer_destroy(struct fenced_buffer *fenced_buf) +{ + assert(!fenced_buf->base.base.refcount); + assert(!fenced_buf->fence); + pb_reference(&fenced_buf->buffer, NULL); + FREE(fenced_buf); +} + + +static INLINE void +_fenced_buffer_remove(struct fenced_buffer_list *fenced_list, + struct fenced_buffer *fenced_buf) +{ + struct pipe_winsys *winsys = fenced_list->winsys; + + assert(fenced_buf->fence); + assert(fenced_buf->list == fenced_list); + + winsys->fence_reference(winsys, &fenced_buf->fence, NULL); + fenced_buf->flags &= ~PIPE_BUFFER_USAGE_GPU_READ_WRITE; + + assert(fenced_buf->head.prev); + assert(fenced_buf->head.next); + LIST_DEL(&fenced_buf->head); +#ifdef DEBUG + fenced_buf->head.prev = NULL; + fenced_buf->head.next = NULL; +#endif + + assert(fenced_list->numDelayed); + --fenced_list->numDelayed; + + if(!fenced_buf->base.base.refcount) + _fenced_buffer_destroy(fenced_buf); +} + + +static INLINE enum pipe_error +_fenced_buffer_finish(struct fenced_buffer *fenced_buf) +{ + struct fenced_buffer_list *fenced_list = fenced_buf->list; + struct pipe_winsys *winsys = fenced_list->winsys; + +#if 0 + debug_warning("waiting for GPU"); +#endif + + assert(fenced_buf->fence); + if(fenced_buf->fence) { + if(winsys->fence_finish(winsys, fenced_buf->fence, 0) != 0) { + return PIPE_ERROR; + } + /* Remove from the fenced list */ + /* TODO: remove consequents */ + _fenced_buffer_remove(fenced_list, fenced_buf); + } + + fenced_buf->flags &= ~PIPE_BUFFER_USAGE_GPU_READ_WRITE; + return PIPE_OK; +} + + +/** + * Free as many fenced buffers from the list head as possible. + */ +static void +_fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list, + int wait) +{ + struct pipe_winsys *winsys = fenced_list->winsys; + struct list_head *curr, *next; + struct fenced_buffer *fenced_buf; + struct pipe_fence_handle *prev_fence = NULL; + + curr = fenced_list->delayed.next; + next = curr->next; + while(curr != &fenced_list->delayed) { + fenced_buf = LIST_ENTRY(struct fenced_buffer, curr, head); + + if(fenced_buf->fence != prev_fence) { + int signaled; + if (wait) + signaled = winsys->fence_finish(winsys, fenced_buf->fence, 0); + else + signaled = winsys->fence_signalled(winsys, fenced_buf->fence, 0); + if (signaled != 0) + break; + prev_fence = fenced_buf->fence; + } + else { + assert(winsys->fence_signalled(winsys, fenced_buf->fence, 0) == 0); + } + + _fenced_buffer_remove(fenced_list, fenced_buf); + + curr = next; + next = curr->next; + } +} + + +static void +fenced_buffer_destroy(struct pb_buffer *buf) +{ + struct fenced_buffer *fenced_buf = fenced_buffer(buf); + struct fenced_buffer_list *fenced_list = fenced_buf->list; + + pipe_mutex_lock(fenced_list->mutex); + assert(fenced_buf->base.base.refcount == 0); + if (fenced_buf->fence) { + struct pipe_winsys *winsys = fenced_list->winsys; + if(winsys->fence_signalled(winsys, fenced_buf->fence, 0) == 0) { + struct list_head *curr, *prev; + curr = &fenced_buf->head; + prev = curr->prev; + do { + fenced_buf = LIST_ENTRY(struct fenced_buffer, curr, head); + assert(winsys->fence_signalled(winsys, fenced_buf->fence, 0) == 0); + _fenced_buffer_remove(fenced_list, fenced_buf); + curr = prev; + prev = curr->prev; + } while (curr != &fenced_list->delayed); + } + else { + /* delay destruction */ + } + } + else { + _fenced_buffer_destroy(fenced_buf); + } + pipe_mutex_unlock(fenced_list->mutex); +} + + +static void * +fenced_buffer_map(struct pb_buffer *buf, + unsigned flags) +{ + struct fenced_buffer *fenced_buf = fenced_buffer(buf); + void *map; + + assert(!(flags & ~PIPE_BUFFER_USAGE_CPU_READ_WRITE)); + flags &= PIPE_BUFFER_USAGE_CPU_READ_WRITE; + + /* Check for GPU read/write access */ + if(fenced_buf->flags & PIPE_BUFFER_USAGE_GPU_WRITE) { + /* Wait for the GPU to finish writing */ + _fenced_buffer_finish(fenced_buf); + } + +#if 0 + /* Check for CPU write access (read is OK) */ + if(fenced_buf->flags & PIPE_BUFFER_USAGE_CPU_READ_WRITE) { + /* this is legal -- just for debugging */ + debug_warning("concurrent CPU writes"); + } +#endif + + map = pb_map(fenced_buf->buffer, flags); + if(map) { + ++fenced_buf->mapcount; + fenced_buf->flags |= flags; + } + + return map; +} + + +static void +fenced_buffer_unmap(struct pb_buffer *buf) +{ + struct fenced_buffer *fenced_buf = fenced_buffer(buf); + assert(fenced_buf->mapcount); + if(fenced_buf->mapcount) { + pb_unmap(fenced_buf->buffer); + --fenced_buf->mapcount; + if(!fenced_buf->mapcount) + fenced_buf->flags &= ~PIPE_BUFFER_USAGE_CPU_READ_WRITE; + } +} + + +static void +fenced_buffer_get_base_buffer(struct pb_buffer *buf, + struct pb_buffer **base_buf, + unsigned *offset) +{ + struct fenced_buffer *fenced_buf = fenced_buffer(buf); + pb_get_base_buffer(fenced_buf->buffer, base_buf, offset); +} + + +const struct pb_vtbl +fenced_buffer_vtbl = { + fenced_buffer_destroy, + fenced_buffer_map, + fenced_buffer_unmap, + fenced_buffer_get_base_buffer +}; + + +struct pb_buffer * +fenced_buffer_create(struct fenced_buffer_list *fenced_list, + struct pb_buffer *buffer) +{ + struct fenced_buffer *buf; + + if(!buffer) + return NULL; + + buf = CALLOC_STRUCT(fenced_buffer); + if(!buf) { + pb_reference(&buffer, NULL); + return NULL; + } + + buf->base.base.refcount = 1; + buf->base.base.alignment = buffer->base.alignment; + buf->base.base.usage = buffer->base.usage; + buf->base.base.size = buffer->base.size; + + buf->base.vtbl = &fenced_buffer_vtbl; + buf->buffer = buffer; + buf->list = fenced_list; + + return &buf->base; +} + + +void +buffer_fence(struct pb_buffer *buf, + struct pipe_fence_handle *fence) +{ + struct fenced_buffer *fenced_buf; + struct fenced_buffer_list *fenced_list; + struct pipe_winsys *winsys; + /* FIXME: receive this as a parameter */ + unsigned flags = fence ? PIPE_BUFFER_USAGE_GPU_READ_WRITE : 0; + + /* This is a public function, so be extra cautious with the buffer passed, + * as happens frequently to receive null buffers, or pointer to buffers + * other than fenced buffers. */ + assert(buf); + if(!buf) + return; + assert(buf->vtbl == &fenced_buffer_vtbl); + if(buf->vtbl != &fenced_buffer_vtbl) + return; + + fenced_buf = fenced_buffer(buf); + fenced_list = fenced_buf->list; + winsys = fenced_list->winsys; + + if(!fence || fence == fenced_buf->fence) { + /* Handle the same fence case specially, not only because it is a fast + * path, but mostly to avoid serializing two writes with the same fence, + * as that would bring the hardware down to synchronous operation without + * any benefit. + */ + fenced_buf->flags |= flags & PIPE_BUFFER_USAGE_GPU_READ_WRITE; + return; + } + + pipe_mutex_lock(fenced_list->mutex); + if (fenced_buf->fence) + _fenced_buffer_remove(fenced_list, fenced_buf); + if (fence) { + winsys->fence_reference(winsys, &fenced_buf->fence, fence); + fenced_buf->flags |= flags & PIPE_BUFFER_USAGE_GPU_READ_WRITE; + _fenced_buffer_add(fenced_buf); + } + pipe_mutex_unlock(fenced_list->mutex); +} + + +struct fenced_buffer_list * +fenced_buffer_list_create(struct pipe_winsys *winsys) +{ + struct fenced_buffer_list *fenced_list; + + fenced_list = CALLOC_STRUCT(fenced_buffer_list); + if (!fenced_list) + return NULL; + + fenced_list->winsys = winsys; + + LIST_INITHEAD(&fenced_list->delayed); + + fenced_list->numDelayed = 0; + + pipe_mutex_init(fenced_list->mutex); + + return fenced_list; +} + + +void +fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list, + int wait) +{ + pipe_mutex_lock(fenced_list->mutex); + _fenced_buffer_list_check_free(fenced_list, wait); + pipe_mutex_unlock(fenced_list->mutex); +} + + +void +fenced_buffer_list_destroy(struct fenced_buffer_list *fenced_list) +{ + pipe_mutex_lock(fenced_list->mutex); + + /* Wait on outstanding fences */ + while (fenced_list->numDelayed) { + pipe_mutex_unlock(fenced_list->mutex); +#if defined(PIPE_OS_LINUX) + sched_yield(); +#endif + _fenced_buffer_list_check_free(fenced_list, 1); + pipe_mutex_lock(fenced_list->mutex); + } + + pipe_mutex_unlock(fenced_list->mutex); + + FREE(fenced_list); +} + + |