Logo Search packages:      
Sourcecode: linux version File versions  Download package

radeon_mem.c

/* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*- */
/*
 * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
 *
 * The Weather Channel (TM) funded Tungsten Graphics to develop the
 * initial release of the Radeon 8500 driver under the XFree86 license.
 * This notice must be preserved.
 *
 * 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 (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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT 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.
 *
 * Authors:
 *    Keith Whitwell <keith@tungstengraphics.com>
 */

#include "drmP.h"
#include "drm.h"
#include "radeon_drm.h"
#include "radeon_drv.h"

/* Very simple allocator for GART memory, working on a static range
 * already mapped into each client's address space.
 */

static struct mem_block *split_block(struct mem_block *p, int start, int size,
                             struct drm_file *file_priv)
{
      /* Maybe cut off the start of an existing block */
      if (start > p->start) {
            struct mem_block *newblock =
                drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
            if (!newblock)
                  goto out;
            newblock->start = start;
            newblock->size = p->size - (start - p->start);
            newblock->file_priv = NULL;
            newblock->next = p->next;
            newblock->prev = p;
            p->next->prev = newblock;
            p->next = newblock;
            p->size -= newblock->size;
            p = newblock;
      }

      /* Maybe cut off the end of an existing block */
      if (size < p->size) {
            struct mem_block *newblock =
                drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
            if (!newblock)
                  goto out;
            newblock->start = start + size;
            newblock->size = p->size - size;
            newblock->file_priv = NULL;
            newblock->next = p->next;
            newblock->prev = p;
            p->next->prev = newblock;
            p->next = newblock;
            p->size = size;
      }

      out:
      /* Our block is in the middle */
      p->file_priv = file_priv;
      return p;
}

static struct mem_block *alloc_block(struct mem_block *heap, int size,
                             int align2, struct drm_file *file_priv)
{
      struct mem_block *p;
      int mask = (1 << align2) - 1;

      list_for_each(p, heap) {
            int start = (p->start + mask) & ~mask;
            if (p->file_priv == 0 && start + size <= p->start + p->size)
                  return split_block(p, start, size, file_priv);
      }

      return NULL;
}

static struct mem_block *find_block(struct mem_block *heap, int start)
{
      struct mem_block *p;

      list_for_each(p, heap)
          if (p->start == start)
            return p;

      return NULL;
}

static void free_block(struct mem_block *p)
{
      p->file_priv = NULL;

      /* Assumes a single contiguous range.  Needs a special file_priv in
       * 'heap' to stop it being subsumed.
       */
      if (p->next->file_priv == 0) {
            struct mem_block *q = p->next;
            p->size += q->size;
            p->next = q->next;
            p->next->prev = p;
            drm_free(q, sizeof(*q), DRM_MEM_BUFS);
      }

      if (p->prev->file_priv == 0) {
            struct mem_block *q = p->prev;
            q->size += p->size;
            q->next = p->next;
            q->next->prev = q;
            drm_free(p, sizeof(*q), DRM_MEM_BUFS);
      }
}

/* Initialize.  How to check for an uninitialized heap?
 */
static int init_heap(struct mem_block **heap, int start, int size)
{
      struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFS);

      if (!blocks)
            return -ENOMEM;

      *heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFS);
      if (!*heap) {
            drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFS);
            return -ENOMEM;
      }

      blocks->start = start;
      blocks->size = size;
      blocks->file_priv = NULL;
      blocks->next = blocks->prev = *heap;

      memset(*heap, 0, sizeof(**heap));
      (*heap)->file_priv = (struct drm_file *) - 1;
      (*heap)->next = (*heap)->prev = blocks;
      return 0;
}

/* Free all blocks associated with the releasing file.
 */
void radeon_mem_release(struct drm_file *file_priv, struct mem_block *heap)
{
      struct mem_block *p;

      if (!heap || !heap->next)
            return;

      list_for_each(p, heap) {
            if (p->file_priv == file_priv)
                  p->file_priv = NULL;
      }

      /* Assumes a single contiguous range.  Needs a special file_priv in
       * 'heap' to stop it being subsumed.
       */
      list_for_each(p, heap) {
            while (p->file_priv == 0 && p->next->file_priv == 0) {
                  struct mem_block *q = p->next;
                  p->size += q->size;
                  p->next = q->next;
                  p->next->prev = p;
                  drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
            }
      }
}

/* Shutdown.
 */
void radeon_mem_takedown(struct mem_block **heap)
{
      struct mem_block *p;

      if (!*heap)
            return;

      for (p = (*heap)->next; p != *heap;) {
            struct mem_block *q = p;
            p = p->next;
            drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
      }

      drm_free(*heap, sizeof(**heap), DRM_MEM_DRIVER);
      *heap = NULL;
}

/* IOCTL HANDLERS */

static struct mem_block **get_heap(drm_radeon_private_t * dev_priv, int region)
{
      switch (region) {
      case RADEON_MEM_REGION_GART:
            return &dev_priv->gart_heap;
      case RADEON_MEM_REGION_FB:
            return &dev_priv->fb_heap;
      default:
            return NULL;
      }
}

int radeon_mem_alloc(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
      drm_radeon_private_t *dev_priv = dev->dev_private;
      drm_radeon_mem_alloc_t *alloc = data;
      struct mem_block *block, **heap;

      if (!dev_priv) {
            DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
            return -EINVAL;
      }

      heap = get_heap(dev_priv, alloc->region);
      if (!heap || !*heap)
            return -EFAULT;

      /* Make things easier on ourselves: all allocations at least
       * 4k aligned.
       */
      if (alloc->alignment < 12)
            alloc->alignment = 12;

      block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);

      if (!block)
            return -ENOMEM;

      if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
                       sizeof(int))) {
            DRM_ERROR("copy_to_user\n");
            return -EFAULT;
      }

      return 0;
}

int radeon_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
      drm_radeon_private_t *dev_priv = dev->dev_private;
      drm_radeon_mem_free_t *memfree = data;
      struct mem_block *block, **heap;

      if (!dev_priv) {
            DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
            return -EINVAL;
      }

      heap = get_heap(dev_priv, memfree->region);
      if (!heap || !*heap)
            return -EFAULT;

      block = find_block(*heap, memfree->region_offset);
      if (!block)
            return -EFAULT;

      if (block->file_priv != file_priv)
            return -EPERM;

      free_block(block);
      return 0;
}

int radeon_mem_init_heap(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
      drm_radeon_private_t *dev_priv = dev->dev_private;
      drm_radeon_mem_init_heap_t *initheap = data;
      struct mem_block **heap;

      if (!dev_priv) {
            DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
            return -EINVAL;
      }

      heap = get_heap(dev_priv, initheap->region);
      if (!heap)
            return -EFAULT;

      if (*heap) {
            DRM_ERROR("heap already initialized?");
            return -EFAULT;
      }

      return init_heap(heap, initheap->start, initheap->size);
}

Generated by  Doxygen 1.6.0   Back to index