/** * \file drm_memory.c * Memory management wrappers for DRM * * \author Rickard E. (Rik) Faith * \author Gareth Hughes */ /* * 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 #include #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 /* * Find the drm_map that covers the range [offset, offset+size). */ static drm_map_t *drm_lookup_map(unsigned long offset, unsigned long size, drm_device_t * dev) { struct list_head *list; drm_map_list_t *r_list; drm_map_t *map; list_for_each(list, &dev->maplist->head) { r_list = (drm_map_list_t *) list; map = r_list->map; if (!map) continue; if (map->offset <= offset && (offset + size) <= (map->offset + map->size)) return map; } return NULL; } static void *agp_remap(unsigned long offset, unsigned long size, drm_device_t * 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 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) 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(drm_device_t * 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 drm_map_t *drm_lookup_map(unsigned long offset, unsigned long size, drm_device_t * dev) { return NULL; } static inline void *agp_remap(unsigned long offset, unsigned long size, drm_device_t * dev) { return NULL; } #endif /* agp */ void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t * dev) { if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) { drm_map_t *map = drm_lookup_map(offset, size, dev); if (map && map->type == _DRM_AGP) return agp_remap(offset, size, dev); } return ioremap(offset, size); } EXPORT_SYMBOL(drm_ioremap); #if 0 void *drm_ioremap_nocache(unsigned long offset, unsigned long size, drm_device_t * dev) { if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) { drm_map_t *map = drm_lookup_map(offset, size, dev); if (map && map->type == _DRM_AGP) return agp_remap(offset, size, dev); } return ioremap_nocache(offset, size); } #endif /* 0 */ void drm_ioremapfree(void *pt, unsigned long size, drm_device_t * dev) { /* * This is a bit ugly. It would be much cleaner if the DRM API would use separate * routines for handling mappings in the AGP space. Hopefully this can be done in * a future revision of the interface... */ if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture && ((unsigned long)pt >= VMALLOC_START && (unsigned long)pt < VMALLOC_END)) { unsigned long offset; drm_map_t *map; offset = drm_follow_page(pt) | ((unsigned long)pt & ~PAGE_MASK); map = drm_lookup_map(offset, size, dev); if (map && map->type == _DRM_AGP) { vunmap(pt); return; } } iounmap(pt); } EXPORT_SYMBOL(drm_ioremapfree); #endif /* debug_memory */