diff options
| -rw-r--r-- | xc/programs/Xserver/hw/xfree86/os-support/shared/drm/kernel/radeon_mem.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/xc/programs/Xserver/hw/xfree86/os-support/shared/drm/kernel/radeon_mem.c b/xc/programs/Xserver/hw/xfree86/os-support/shared/drm/kernel/radeon_mem.c new file mode 100644 index 000000000..50b6ee38c --- /dev/null +++ b/xc/programs/Xserver/hw/xfree86/os-support/shared/drm/kernel/radeon_mem.c @@ -0,0 +1,336 @@ +/* radeon_mem.c -- Simple agp/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 "radeon.h" +#include "drmP.h" +#include "drm.h" +#include "radeon_drm.h" +#include "radeon_drv.h" + +/* Very simple allocator for agp 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, + int pid ) +{ + /* Maybe cut off the start of an existing block */ + if (start > p->start) { + struct mem_block *newblock = DRM_MALLOC(sizeof(*newblock)); + if (!newblock) + goto out; + newblock->start = start; + newblock->size = p->size - (start - p->start); + newblock->pid = 0; + 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_MALLOC(sizeof(*newblock)); + if (!newblock) + goto out; + newblock->start = start + size; + newblock->size = p->size - size; + newblock->pid = 0; + 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->pid = pid; + return p; +} + +static struct mem_block *alloc_block( struct mem_block *heap, int size, + int align2, int pid ) +{ + struct mem_block *p; + int mask = (1 << align2)-1; + + for (p = heap->next ; p != heap ; p = p->next) { + int start = (p->start + mask) & ~mask; + if (p->pid == 0 && start + size <= p->start + p->size) + return split_block( p, start, size, pid ); + } + + return NULL; +} + +static struct mem_block *find_block( struct mem_block *heap, int start ) +{ + struct mem_block *p; + + for (p = heap->next ; p != heap ; p = p->next) + if (p->start == start) + return p; + + return NULL; +} + + +static void free_block( struct mem_block *p ) +{ + p->pid = 0; + + /* Assumes a single contiguous range. Needs a special pid in + * 'heap' to stop it being subsumed. + */ + if (p->next->pid == 0) { + struct mem_block *q = p->next; + p->size += q->size; + p->next = q->next; + p->next->prev = p; + DRM_FREE(q); + } + + if (p->prev->pid == 0) { + struct mem_block *q = p->prev; + q->size += p->size; + q->next = p->next; + q->next->prev = q; + DRM_FREE(p); + } +} + +#if 0 +static void print_heap( struct mem_block *heap ) +{ + struct mem_block *p; + + for (p = heap->next ; p != heap ; p = p->next) + DRM_DEBUG("0x%x..0x%x (0x%x) -- owner %d\n", + p->start, p->start + p->size, + p->size, p->pid); +} +#endif + +/* 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_MALLOC(sizeof(*blocks)); + + if (!blocks) + return -ENOMEM; + + *heap = DRM_MALLOC(sizeof(**heap)); + if (!*heap) { + DRM_FREE( blocks ); + return -ENOMEM; + } + + blocks->start = start; + blocks->size = size; + blocks->pid = 0; + blocks->next = blocks->prev = *heap; + + memset( *heap, 0, sizeof(**heap) ); + (*heap)->pid = -1; + (*heap)->next = (*heap)->prev = blocks; + return 0; +} + + +/* Free all blocks associated with the releasing pid. + */ +void radeon_mem_release( struct mem_block *heap ) +{ + int pid = DRM_CURRENTPID; + struct mem_block *p; + + if (!heap || !heap->next) + return; + + for (p = heap->next ; p != heap ; p = p->next) { + if (p->pid == pid) + p->pid = 0; + } + + /* Assumes a single contiguous range. Needs a special pid in + * 'heap' to stop it being subsumed. + */ + for (p = heap->next ; p != heap ; p = p->next) { + while (p->pid == 0 && p->next->pid == 0) { + struct mem_block *q = p->next; + p->size += q->size; + p->next = q->next; + p->next->prev = p; + DRM_FREE(q); + } + } +} + +/* 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); + } + + DRM_FREE( *heap ); + *heap = 0; +} + + + +/* IOCTL HANDLERS */ + +static struct mem_block **get_heap( drm_radeon_private_t *dev_priv, + int region ) +{ + switch( region ) { + case RADEON_MEM_REGION_AGP: + return &dev_priv->agp_heap; + case RADEON_MEM_REGION_FB: + return &dev_priv->fb_heap; + default: + return 0; + } +} + +int radeon_mem_alloc( DRM_IOCTL_ARGS ) +{ + DRM_DEVICE; + drm_radeon_private_t *dev_priv = dev->dev_private; + drm_radeon_mem_alloc_t alloc; + struct mem_block *block, **heap; + + if ( !dev_priv ) { + DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); + return DRM_ERR(EINVAL); + } + + DRM_COPY_FROM_USER_IOCTL( alloc, (drm_radeon_mem_alloc_t *)data, + sizeof(alloc) ); + + heap = get_heap( dev_priv, alloc.region ); + if (!heap || !*heap) + return DRM_ERR(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, + DRM_CURRENTPID ); + + if (!block) + return DRM_ERR(ENOMEM); + + if ( DRM_COPY_TO_USER( alloc.region_offset, &block->start, + sizeof(int) ) ) { + DRM_ERROR( "copy_to_user\n" ); + return DRM_ERR(EFAULT); + } + + return 0; +} + + + +int radeon_mem_free( DRM_IOCTL_ARGS ) +{ + DRM_DEVICE; + drm_radeon_private_t *dev_priv = dev->dev_private; + drm_radeon_mem_free_t memfree; + struct mem_block *block, **heap; + + if ( !dev_priv ) { + DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); + return DRM_ERR(EINVAL); + } + + DRM_COPY_FROM_USER_IOCTL( memfree, (drm_radeon_mem_free_t *)data, + sizeof(memfree) ); + + heap = get_heap( dev_priv, memfree.region ); + if (!heap || !*heap) + return DRM_ERR(EFAULT); + + block = find_block( *heap, memfree.region_offset ); + if (!block) + return DRM_ERR(EFAULT); + + if (block->pid != DRM_CURRENTPID) + return DRM_ERR(EPERM); + + free_block( block ); + return 0; +} + +int radeon_mem_init_heap( DRM_IOCTL_ARGS ) +{ + DRM_DEVICE; + drm_radeon_private_t *dev_priv = dev->dev_private; + drm_radeon_mem_init_heap_t initheap; + struct mem_block **heap; + + if ( !dev_priv ) { + DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); + return DRM_ERR(EINVAL); + } + + DRM_COPY_FROM_USER_IOCTL( initheap, (drm_radeon_mem_init_heap_t *)data, + sizeof(initheap) ); + + heap = get_heap( dev_priv, initheap.region ); + if (!heap) + return DRM_ERR(EFAULT); + + if (*heap) { + DRM_ERROR("heap already initialized?"); + return DRM_ERR(EFAULT); + } + + return init_heap( heap, initheap.start, initheap.size ); +} + + |