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drivers/gpu/drm/drm_memory.c
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/** * \file drm_memory.c |
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* Memory management wrappers for DRM * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ |
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/* |
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* 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. */ |
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#include <linux/highmem.h> |
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#include <linux/export.h> |
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#include "drmP.h" |
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/** * Called when "/proc/dri/%dev%/mem" is read. |
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* |
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* \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. * |
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* No-op. |
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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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{ return 0; } |
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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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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; struct drm_agp_mem *agpmem; struct page **page_map; |
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struct page **phys_page_map; |
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void *addr; size = PAGE_ALIGN(size); #ifdef __alpha__ offset -= dev->hose->mem_space->start; #endif |
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list_for_each_entry(agpmem, &dev->agp->memory, head) |
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if (agpmem->bound <= offset && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size)) break; |
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if (&agpmem->head == &dev->agp->memory) |
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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; |
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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); vfree(page_map); return addr; } |
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/** Wrapper around agp_free_memory() */ |
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void drm_free_agp(DRM_AGP_MEM * handle, int pages) |
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{ |
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agp_free_memory(handle); |
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} |
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EXPORT_SYMBOL(drm_free_agp); |
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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 agp_bind_memory(handle, start); |
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} |
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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 agp_unbind_memory(handle); |
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} |
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EXPORT_SYMBOL(drm_unbind_agp); |
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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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struct drm_device * dev) |
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{ return NULL; } |
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#endif /* agp */ |
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|
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void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev) |
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{ |
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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); |
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} |
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EXPORT_SYMBOL(drm_core_ioremap); |
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|
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void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) |
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{ |
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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); |
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} EXPORT_SYMBOL(drm_core_ioremap_wc); |
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|
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void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev) |
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{ |
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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); |
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} |
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EXPORT_SYMBOL(drm_core_ioremapfree); |