139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/*
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* \file drm_memory.c
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* Memory management wrappers for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/export.h>
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#include <linux/highmem.h>
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#include <linux/pci.h>
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#include <linux/vmalloc.h>
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#include <drm/drm_cache.h>
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#include <drm/drm_device.h>
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#include "drm_legacy.h"
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#if IS_ENABLED(CONFIG_AGP)
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#ifdef HAVE_PAGE_AGP
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# include <asm/agp.h>
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#else
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# ifdef __powerpc__
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# define PAGE_AGP pgprot_noncached_wc(PAGE_KERNEL)
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# else
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# define PAGE_AGP PAGE_KERNEL
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# endif
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#endif
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static void *agp_remap(unsigned long offset, unsigned long size,
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struct drm_device *dev)
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{
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unsigned long i, num_pages =
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PAGE_ALIGN(size) / PAGE_SIZE;
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struct drm_agp_mem *agpmem;
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struct page **page_map;
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struct page **phys_page_map;
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void *addr;
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size = PAGE_ALIGN(size);
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#ifdef __alpha__
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offset -= dev->hose->mem_space->start;
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#endif
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list_for_each_entry(agpmem, &dev->agp->memory, head)
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if (agpmem->bound <= offset
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&& (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
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(offset + size))
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break;
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if (&agpmem->head == &dev->agp->memory)
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return NULL;
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/*
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* OK, we're mapping AGP space on a chipset/platform on which memory accesses by
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* the CPU do not get remapped by the GART. We fix this by using the kernel's
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* page-table instead (that's probably faster anyhow...).
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*/
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/* note: use vmalloc() because num_pages could be large... */
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page_map = vmalloc(array_size(num_pages, sizeof(struct page *)));
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if (!page_map)
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return NULL;
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phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
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for (i = 0; i < num_pages; ++i)
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page_map[i] = phys_page_map[i];
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addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
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vfree(page_map);
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return addr;
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}
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#else /* CONFIG_AGP */
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static inline void *agp_remap(unsigned long offset, unsigned long size,
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struct drm_device *dev)
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{
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return NULL;
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}
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#endif /* CONFIG_AGP */
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void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
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{
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if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
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map->handle = agp_remap(map->offset, map->size, dev);
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else
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map->handle = ioremap(map->offset, map->size);
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}
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EXPORT_SYMBOL(drm_legacy_ioremap);
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void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
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{
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if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
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map->handle = agp_remap(map->offset, map->size, dev);
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else
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map->handle = ioremap_wc(map->offset, map->size);
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}
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EXPORT_SYMBOL(drm_legacy_ioremap_wc);
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void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
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{
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if (!map->handle || !map->size)
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return;
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if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
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vunmap(map->handle);
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else
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iounmap(map->handle);
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}
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EXPORT_SYMBOL(drm_legacy_ioremapfree);
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