/* * \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/export.h>#include <linux/highmem.h>#include <linux/pci.h>#include <linux/vmalloc.h> #include <drm/drm_agpsupport.h>#include <drm/drm_cache.h>#include <drm/drm_device.h> #include "drm_legacy.h" #if IS_ENABLED(CONFIG_AGP) #ifdef HAVE_PAGE_AGP# include <asm/agp.h>#else# ifdef __powerpc__#  define PAGE_AGP	pgprot_noncached_wc(PAGE_KERNEL)# else#  define PAGE_AGP	PAGE_KERNEL# endif#endif 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(array_size(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;} #else /*  CONFIG_AGP  */static inline void *agp_remap(unsigned long offset, unsigned long size,			      struct drm_device *dev){	return NULL;} #endif /* CONFIG_AGP */ void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev){	if (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_legacy_ioremap); void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev){	if (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_legacy_ioremap_wc); void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev){	if (!map->handle || !map->size)		return; 	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)		vunmap(map->handle);	else		iounmap(map->handle);}EXPORT_SYMBOL(drm_legacy_ioremapfree);