diff options
Diffstat (limited to 'drivers/gpu/drm/drm_memory.c')
| -rw-r--r-- | drivers/gpu/drm/drm_memory.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c new file mode 100644 index 00000000000..845081b44f6 --- /dev/null +++ b/drivers/gpu/drm/drm_memory.c @@ -0,0 +1,181 @@ +/** + * \file drm_memory.c + * Memory management wrappers for DRM + * + * \author Rickard E. (Rik) Faith <faith@valinux.com> + * \author Gareth Hughes <gareth@valinux.com> + */ + +/* + * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * 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, 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 + * VA LINUX SYSTEMS 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. + */ + +#include <linux/highmem.h> +#include "drmP.h" + +#ifdef DEBUG_MEMORY +#include "drm_memory_debug.h" +#else + +/** No-op. */ +void drm_mem_init(void) +{ +} + +/** + * Called when "/proc/dri/%dev%/mem" is read. + * + * \param buf output buffer. + * \param start start of output data. + * \param offset requested start offset. + * \param len requested number of bytes. + * \param eof whether there is no more data to return. + * \param data private data. + * \return number of written bytes. + * + * No-op. + */ +int drm_mem_info(char *buf, char **start, off_t offset, + int len, int *eof, void *data) +{ + return 0; +} + +/** Wrapper around kmalloc() and kfree() */ +void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area) +{ + void *pt; + + if (!(pt = kmalloc(size, GFP_KERNEL))) + return NULL; + if (oldpt && oldsize) { + memcpy(pt, oldpt, oldsize); + kfree(oldpt); + } + return pt; +} + +#if __OS_HAS_AGP +static void *agp_remap(unsigned long offset, unsigned long size, + struct drm_device * dev) +{ + unsigned long *phys_addr_map, i, num_pages = + PAGE_ALIGN(size) / PAGE_SIZE; + struct drm_agp_mem *agpmem; + struct page **page_map; + void *addr; + + size = PAGE_ALIGN(size); + +#ifdef __alpha__ + offset -= dev->hose->mem_space->start; +#endif + + list_for_each_entry(agpmem, &dev->agp->memory, head) + if (agpmem->bound <= offset + && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= + (offset + size)) + break; + if (!agpmem) + return NULL; + + /* + * OK, we're mapping AGP space on a chipset/platform on which memory accesses by + * the CPU do not get remapped by the GART. We fix this by using the kernel's + * page-table instead (that's probably faster anyhow...). + */ + /* note: use vmalloc() because num_pages could be large... */ + page_map = vmalloc(num_pages * sizeof(struct page *)); + if (!page_map) + return NULL; + + phys_addr_map = + agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE; + for (i = 0; i < num_pages; ++i) + page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT); + addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); + vfree(page_map); + + return addr; +} + +/** Wrapper around agp_allocate_memory() */ +DRM_AGP_MEM *drm_alloc_agp(struct drm_device * dev, int pages, u32 type) +{ + return drm_agp_allocate_memory(dev->agp->bridge, pages, type); +} + +/** Wrapper around agp_free_memory() */ +int drm_free_agp(DRM_AGP_MEM * handle, int pages) +{ + return drm_agp_free_memory(handle) ? 0 : -EINVAL; +} + +/** Wrapper around agp_bind_memory() */ +int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start) +{ + return drm_agp_bind_memory(handle, start); +} + +/** Wrapper around agp_unbind_memory() */ +int drm_unbind_agp(DRM_AGP_MEM * handle) +{ + return drm_agp_unbind_memory(handle); +} + +#else /* __OS_HAS_AGP */ +static inline void *agp_remap(unsigned long offset, unsigned long size, + struct drm_device * dev) +{ + return NULL; +} + +#endif /* agp */ + +#endif /* debug_memory */ + +void drm_core_ioremap(struct drm_map *map, struct drm_device *dev) +{ + if (drm_core_has_AGP(dev) && + dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) + map->handle = agp_remap(map->offset, map->size, dev); + else + map->handle = ioremap(map->offset, map->size); +} +EXPORT_SYMBOL(drm_core_ioremap); + +void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev) +{ + if (!map->handle || !map->size) + return; + + if (drm_core_has_AGP(dev) && + dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) + vunmap(map->handle); + else + iounmap(map->handle); +} +EXPORT_SYMBOL(drm_core_ioremapfree); |