![Christoph Hellwig](/assets/img/avatar_default.png)
hch originally submitted this for paravirt ops work, airlied took it and cleaned up a lot of unused code caused by using this. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Airlie <airlied@linux.ie>
183 lines
4.9 KiB
C
183 lines
4.9 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/highmem.h>
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#include "drmP.h"
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#ifdef DEBUG_MEMORY
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#include "drm_memory_debug.h"
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#else
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/** No-op. */
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void drm_mem_init(void)
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{
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}
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/**
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* Called when "/proc/dri/%dev%/mem" is read.
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*
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* \param buf output buffer.
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* \param start start of output data.
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* \param offset requested start offset.
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* \param len requested number of bytes.
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* \param eof whether there is no more data to return.
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* \param data private data.
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* \return number of written bytes.
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*
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* No-op.
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*/
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int drm_mem_info(char *buf, char **start, off_t offset,
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int len, int *eof, void *data)
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{
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return 0;
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}
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/** Wrapper around kmalloc() and kfree() */
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void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
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{
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void *pt;
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if (!(pt = kmalloc(size, GFP_KERNEL)))
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return NULL;
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if (oldpt && oldsize) {
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memcpy(pt, oldpt, oldsize);
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kfree(oldpt);
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}
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return pt;
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}
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#if __OS_HAS_AGP
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static void *agp_remap(unsigned long offset, unsigned long size,
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drm_device_t * dev)
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{
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unsigned long *phys_addr_map, 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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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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for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
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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)
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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(num_pages * sizeof(struct page *));
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if (!page_map)
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return NULL;
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phys_addr_map =
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agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
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for (i = 0; i < num_pages; ++i)
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page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
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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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/** Wrapper around agp_allocate_memory() */
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DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
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{
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return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
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}
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/** Wrapper around agp_free_memory() */
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int drm_free_agp(DRM_AGP_MEM * handle, int pages)
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{
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return drm_agp_free_memory(handle) ? 0 : -EINVAL;
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}
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/** Wrapper around agp_bind_memory() */
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int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
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{
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return drm_agp_bind_memory(handle, start);
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}
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/** Wrapper around agp_unbind_memory() */
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int drm_unbind_agp(DRM_AGP_MEM * handle)
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{
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return drm_agp_unbind_memory(handle);
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}
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#else /* __OS_HAS_AGP */
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static inline void *agp_remap(unsigned long offset, unsigned long size,
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drm_device_t * dev)
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{
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return NULL;
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}
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#endif /* agp */
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#endif /* debug_memory */
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void drm_core_ioremap(struct drm_map *map, struct drm_device *dev)
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{
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if (drm_core_has_AGP(dev) &&
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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_core_ioremap);
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void drm_core_ioremapfree(struct drm_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 (drm_core_has_AGP(dev) &&
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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_core_ioremapfree);
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