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author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-14 20:32:24 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-14 20:32:24 (GMT) |
commit | c142bda458a9c81097238800e1bd8eeeea09913d (patch) | |
tree | a412321f62cbb90cae831d7f2dea026cbd3c958c /drivers/gpu/drm/radeon/radeon_mem.c | |
parent | b5cf43c47b05c8deb10f9674d541dddbdec0e341 (diff) | |
parent | c0e09200dc0813972442e550a5905a132768e56c (diff) | |
download | linux-fsl-qoriq-c142bda458a9c81097238800e1bd8eeeea09913d.tar.xz |
Merge branch 'drm-reorg' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-reorg' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
drm: reorganise drm tree to be more future proof.
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_mem.c')
-rw-r--r-- | drivers/gpu/drm/radeon/radeon_mem.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_mem.c b/drivers/gpu/drm/radeon/radeon_mem.c new file mode 100644 index 0000000..4af5286 --- /dev/null +++ b/drivers/gpu/drm/radeon/radeon_mem.c @@ -0,0 +1,302 @@ +/* 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 == NULL && 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 == NULL) { + 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 == NULL) { + 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 == NULL && p->next->file_priv == NULL) { + 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("called with no initialization\n"); + 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("called with no initialization\n"); + 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("called with no initialization\n"); + 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); +} |