--- /dev/null
+/**************************************************************************
+ *
+ * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
+ * 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 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
+ * THE COPYRIGHT HOLDERS, AUTHORS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * S-lab pool implementation.
+ *
+ * @author Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ * @author Jose Fonseca <jrfonseca@tungstengraphics.com>
+ */
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_error.h"
+#include "pipe/p_debug.h"
+#include "pipe/p_thread.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_util.h"
+#include "util/u_double_list.h"
+#include "util/u_time.h"
+
+#include "pb_buffer.h"
+#include "pb_bufmgr.h"
+
+
+#define DRI_SLABPOOL_ALLOC_RETRIES 100
+
+
+struct pb_slab;
+
+struct pb_slab_buffer
+{
+ struct pb_buffer base;
+
+ struct pb_slab *slab;
+ struct list_head head;
+ unsigned mapCount;
+ size_t start;
+ _glthread_Cond event;
+};
+
+struct pb_slab
+{
+ struct list_head head;
+ struct list_head freeBuffers;
+ size_t numBuffers;
+ size_t numFree;
+ struct pb_slab_buffer *buffers;
+ struct pb_slab_size_header *header;
+
+ struct pb_buffer *bo;
+ size_t pageAlignment;
+ void *virtual;
+};
+
+struct pb_slab_size_header
+{
+ struct list_head slabs;
+ struct list_head freeSlabs;
+ struct pb_slab_manager *pool;
+ size_t bufSize;
+ _glthread_Mutex mutex;
+};
+
+/**
+ * The data of this structure remains constant after
+ * initialization and thus needs no mutex protection.
+ */
+struct pb_slab_manager
+{
+ struct pb_manager base;
+
+ struct pb_desc desc;
+ size_t *bucketSizes;
+ size_t numBuckets;
+ size_t pageSize;
+ struct pb_manager *provider;
+ unsigned pageAlignment;
+ unsigned maxSlabSize;
+ unsigned desiredNumBuffers;
+ struct pb_slab_size_header *headers;
+};
+
+
+static INLINE struct pb_slab_buffer *
+pb_slab_buffer(struct pb_buffer *buf)
+{
+ assert(buf);
+ return (struct pb_slab_buffer *)buf;
+}
+
+
+static INLINE struct pb_slab_manager *
+pb_slab_manager(struct pb_manager *mgr)
+{
+ assert(mgr);
+ return (struct pb_slab_manager *)mgr;
+}
+
+
+/**
+ * Delete a buffer from the slab header delayed list and put
+ * it on the slab FREE list.
+ */
+static void
+pb_slab_buffer_destroy(struct pb_buffer *_buf)
+{
+ struct pb_slab_buffer *buf = pb_slab_buffer(_buf);
+ struct pb_slab *slab = buf->slab;
+ struct pb_slab_size_header *header = slab->header;
+ struct list_head *list = &buf->head;
+
+ _glthread_LOCK_MUTEX(header->mutex);
+
+ assert(buf->base.base.refcount == 0);
+
+ buf->mapCount = 0;
+
+ LIST_DEL(list);
+ LIST_ADDTAIL(list, &slab->freeBuffers);
+ slab->numFree++;
+
+ if (slab->head.next == &slab->head)
+ LIST_ADDTAIL(&slab->head, &header->slabs);
+
+ if (slab->numFree == slab->numBuffers) {
+ list = &slab->head;
+ LIST_DEL(list);
+ LIST_ADDTAIL(list, &header->freeSlabs);
+ }
+
+ if (header->slabs.next == &header->slabs || slab->numFree
+ != slab->numBuffers) {
+
+ struct list_head *next;
+
+ for (list = header->freeSlabs.next, next = list->next; list
+ != &header->freeSlabs; list = next, next = list->next) {
+
+ slab = LIST_ENTRY(struct pb_slab, list, head);
+
+ LIST_DELINIT(list);
+ pb_reference(&slab->bo, NULL);
+ FREE(slab->buffers);
+ FREE(slab);
+ }
+ }
+
+ _glthread_UNLOCK_MUTEX(header->mutex);
+}
+
+
+static void *
+pb_slab_buffer_map(struct pb_buffer *_buf,
+ unsigned flags)
+{
+ struct pb_slab_buffer *buf = pb_slab_buffer(_buf);
+
+ ++buf->mapCount;
+ return (void *) ((uint8_t *) buf->slab->virtual + buf->start);
+}
+
+
+static void
+pb_slab_buffer_unmap(struct pb_buffer *_buf)
+{
+ struct pb_slab_buffer *buf = pb_slab_buffer(_buf);
+
+ --buf->mapCount;
+ if (buf->mapCount == 0)
+ _glthread_COND_BROADCAST(buf->event);
+}
+
+
+static void
+pb_slab_buffer_get_base_buffer(struct pb_buffer *_buf,
+ struct pb_buffer **base_buf,
+ unsigned *offset)
+{
+ struct pb_slab_buffer *buf = pb_slab_buffer(_buf);
+ pb_get_base_buffer(buf->slab->bo, base_buf, offset);
+ *offset += buf->start;
+}
+
+
+static const struct pb_vtbl
+pb_slab_buffer_vtbl = {
+ pb_slab_buffer_destroy,
+ pb_slab_buffer_map,
+ pb_slab_buffer_unmap,
+ pb_slab_buffer_get_base_buffer
+};
+
+
+static enum pipe_error
+pb_slab_create(struct pb_slab_size_header *header)
+{
+ struct pb_slab_manager *pool = header->pool;
+ size_t size = header->bufSize * pool->desiredNumBuffers;
+ struct pb_slab *slab;
+ struct pb_slab_buffer *buf;
+ size_t numBuffers;
+ int ret;
+ unsigned i;
+
+ slab = CALLOC_STRUCT(pb_slab);
+ if (!slab)
+ return PIPE_ERROR_OUT_OF_MEMORY;
+
+ /*
+ * FIXME: We should perhaps allow some variation in slabsize in order
+ * to efficiently reuse slabs.
+ */
+
+ size = (size <= pool->maxSlabSize) ? size : pool->maxSlabSize;
+ size = (size + pool->pageSize - 1) & ~(pool->pageSize - 1);
+
+ slab->bo = pool->provider->create_buffer(pool->provider, size, &pool->desc);
+ if(!slab->bo)
+ goto out_err0;
+
+ slab->virtual = pb_map(slab->bo,
+ PIPE_BUFFER_USAGE_CPU_READ |
+ PIPE_BUFFER_USAGE_CPU_WRITE);
+ if(!slab->virtual)
+ goto out_err1;
+
+ pb_unmap(slab->bo);
+
+ numBuffers = slab->bo->base.size / header->bufSize;
+
+ slab->buffers = CALLOC(numBuffers, sizeof(*slab->buffers));
+ if (!slab->buffers) {
+ ret = PIPE_ERROR_OUT_OF_MEMORY;
+ goto out_err1;
+ }
+
+ LIST_INITHEAD(&slab->head);
+ LIST_INITHEAD(&slab->freeBuffers);
+ slab->numBuffers = numBuffers;
+ slab->numFree = 0;
+ slab->header = header;
+
+ buf = slab->buffers;
+ for (i=0; i < numBuffers; ++i) {
+ buf->base.base.refcount = 0;
+ buf->base.base.size = header->bufSize;
+ buf->base.base.alignment = 0;
+ buf->base.base.usage = 0;
+ buf->base.vtbl = &pb_slab_buffer_vtbl;
+ buf->slab = slab;
+ buf->start = i* header->bufSize;
+ buf->mapCount = 0;
+ _glthread_INIT_COND(buf->event);
+ LIST_ADDTAIL(&buf->head, &slab->freeBuffers);
+ slab->numFree++;
+ buf++;
+ }
+
+ LIST_ADDTAIL(&slab->head, &header->slabs);
+
+ return PIPE_OK;
+
+out_err1:
+ pb_reference(&slab->bo, NULL);
+out_err0:
+ FREE(slab);
+ return ret;
+}
+
+
+static struct pb_buffer *
+pb_slab_manager_create_buffer(struct pb_manager *_pool,
+ size_t size,
+ const struct pb_desc *desc)
+{
+ struct pb_slab_manager *pool = pb_slab_manager(_pool);
+ struct pb_slab_size_header *header;
+ unsigned i;
+ static struct pb_slab_buffer *buf;
+ struct pb_slab *slab;
+ struct list_head *list;
+ int count = DRI_SLABPOOL_ALLOC_RETRIES;
+
+ /*
+ * FIXME: Check for compatibility.
+ */
+
+ header = pool->headers;
+ for (i=0; i<pool->numBuckets; ++i) {
+ if (header->bufSize >= size)
+ break;
+ header++;
+ }
+
+ if (i >= pool->numBuckets)
+ /* Fall back to allocate a buffer object directly from the provider. */
+ return pool->provider->create_buffer(pool->provider, size, desc);
+
+
+ _glthread_LOCK_MUTEX(header->mutex);
+ while (header->slabs.next == &header->slabs && count > 0) {
+ if (header->slabs.next != &header->slabs)
+ break;
+
+ _glthread_UNLOCK_MUTEX(header->mutex);
+ if (count != DRI_SLABPOOL_ALLOC_RETRIES)
+ util_time_sleep(1);
+ _glthread_LOCK_MUTEX(header->mutex);
+ (void) pb_slab_create(header);
+ count--;
+ }
+
+ list = header->slabs.next;
+ if (list == &header->slabs) {
+ _glthread_UNLOCK_MUTEX(header->mutex);
+ return NULL;
+ }
+ slab = LIST_ENTRY(struct pb_slab, list, head);
+ if (--slab->numFree == 0)
+ LIST_DELINIT(list);
+
+ list = slab->freeBuffers.next;
+ LIST_DELINIT(list);
+
+ _glthread_UNLOCK_MUTEX(header->mutex);
+ buf = LIST_ENTRY(struct pb_slab_buffer, list, head);
+ ++buf->base.base.refcount;
+ return &buf->base;
+}
+
+
+static void
+pb_slab_manager_destroy(struct pb_manager *_pool)
+{
+ struct pb_slab_manager *pool = pb_slab_manager(_pool);
+
+ FREE(pool->headers);
+ FREE(pool->bucketSizes);
+ FREE(pool);
+}
+
+
+struct pb_manager *
+pb_slab_manager_create(struct pb_manager *provider,
+ const struct pb_desc *desc,
+ size_t smallestSize,
+ size_t numSizes,
+ size_t desiredNumBuffers,
+ size_t maxSlabSize,
+ size_t pageAlignment)
+{
+ struct pb_slab_manager *pool;
+ size_t i;
+
+ pool = CALLOC_STRUCT(pb_slab_manager);
+ if (!pool)
+ goto out_err0;
+
+ pool->bucketSizes = CALLOC(numSizes, sizeof(*pool->bucketSizes));
+ if (!pool->bucketSizes)
+ goto out_err1;
+
+ pool->headers = CALLOC(numSizes, sizeof(*pool->headers));
+ if (!pool->headers)
+ goto out_err2;
+
+ pool->desc = *desc;
+ pool->numBuckets = numSizes;
+#ifdef WIN32
+ pool->pageSize = 4096;
+#else
+ pool->pageSize = getpagesize();
+#endif
+ pool->provider = provider;
+ pool->pageAlignment = pageAlignment;
+ pool->maxSlabSize = maxSlabSize;
+ pool->desiredNumBuffers = desiredNumBuffers;
+
+ for (i=0; i<pool->numBuckets; ++i) {
+ struct pb_slab_size_header *header = &pool->headers[i];
+
+ pool->bucketSizes[i] = (smallestSize << i);
+
+ _glthread_INIT_MUTEX(header->mutex);
+
+ LIST_INITHEAD(&header->slabs);
+ LIST_INITHEAD(&header->freeSlabs);
+
+ header->pool = pool;
+ header->bufSize = (smallestSize << i);
+ }
+
+ pool->base.destroy = pb_slab_manager_destroy;
+ pool->base.create_buffer = pb_slab_manager_create_buffer;
+
+ return &pool->base;
+
+out_err2:
+ FREE(pool->bucketSizes);
+out_err1:
+ FREE(pool);
+out_err0:
+ return NULL;
+}
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