/** * \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 <linux/export.h> #include <drm/drmP.h> #if __OS_HAS_AGP static void *agp_remap(unsigned long offset, unsigned long size, struct drm_device * dev) { unsigned long i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE; struct drm_agp_mem *agpmem; struct page **page_map; struct page **phys_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->head == &dev->agp->memory) 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_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); for (i = 0; i < num_pages; ++i) page_map[i] = phys_page_map[i]; addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); vfree(page_map); return addr; } /** Wrapper around agp_free_memory() */ void drm_free_agp(DRM_AGP_MEM * handle, int pages) { agp_free_memory(handle); } EXPORT_SYMBOL(drm_free_agp); /** Wrapper around agp_bind_memory() */ int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start) { return agp_bind_memory(handle, start); } /** Wrapper around agp_unbind_memory() */ int drm_unbind_agp(DRM_AGP_MEM * handle) { return agp_unbind_memory(handle); } EXPORT_SYMBOL(drm_unbind_agp); #else /* __OS_HAS_AGP */ static inline void *agp_remap(unsigned long offset, unsigned long size, struct drm_device * dev) { return NULL; } #endif /* agp */ void drm_core_ioremap(struct drm_local_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_ioremap_wc(struct drm_local_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_wc(map->offset, map->size); } EXPORT_SYMBOL(drm_core_ioremap_wc); void drm_core_ioremapfree(struct drm_local_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);