drivers/char/drm/drm_memory.c - kernel/msm - Gitiles

 /**
  * \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 "drmP.h"

 #ifdef DEBUG_MEMORY
 #include "drm_memory_debug.h"
 #else

 /** No-op. */
 void drm_mem_init(void)
 {
 }

 /**
  * Called when "/proc/dri/%dev%/mem" is read.
  *
  * \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.
  *
  * No-op.
  */
 int drm_mem_info(char *buf, char **start, off_t offset,
 		 int len, int *eof, void *data)
 {
 	return 0;
 }

 /** Wrapper around kmalloc() and kfree() */
 void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
 {
 	void *pt;

 	if (!(pt = kmalloc(size, GFP_KERNEL)))
 		return NULL;
 	if (oldpt && oldsize) {
 		memcpy(pt, oldpt, oldsize);
 		kfree(oldpt);
 	}
 	return pt;
 }

 #if __OS_HAS_AGP
 /*
  * Find the drm_map that covers the range [offset, offset+size).
  */
 static drm_map_t *drm_lookup_map(unsigned long offset,
 				 unsigned long size, drm_device_t * dev)
 {
 	struct list_head *list;
 	drm_map_list_t *r_list;
 	drm_map_t *map;

 	list_for_each(list, &dev->maplist->head) {
 		r_list = (drm_map_list_t *) list;
 		map = r_list->map;
 		if (!map)
 			continue;
 		if (map->offset <= offset
 		    && (offset + size) <= (map->offset + map->size))
 			return map;
 	}
 	return NULL;
 }

 static void *agp_remap(unsigned long offset, unsigned long size,
 		       drm_device_t * dev)
 {
 	unsigned long *phys_addr_map, i, num_pages =
 	    PAGE_ALIGN(size) / PAGE_SIZE;
 	struct drm_agp_mem *agpmem;
 	struct page **page_map;
 	void *addr;

 	size = PAGE_ALIGN(size);

 #ifdef __alpha__
 	offset -= dev->hose->mem_space->start;
 #endif

 	for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
 		if (agpmem->bound <= offset
 		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
 		    (offset + size))
 			break;
 	if (!agpmem)
 		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_addr_map =
 	    agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
 	for (i = 0; i < num_pages; ++i)
 		page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
 	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
 	vfree(page_map);

 	return addr;
 }

 /** Wrapper around agp_allocate_memory() */
 DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
 {
 	return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
 }

 /** Wrapper around agp_free_memory() */
 int drm_free_agp(DRM_AGP_MEM * handle, int pages)
 {
 	return drm_agp_free_memory(handle) ? 0 : -EINVAL;
 }

 /** Wrapper around agp_bind_memory() */
 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
 {
 	return drm_agp_bind_memory(handle, start);
 }

 /** Wrapper around agp_unbind_memory() */
 int drm_unbind_agp(DRM_AGP_MEM * handle)
 {
 	return drm_agp_unbind_memory(handle);
 }

 #else  /*  __OS_HAS_AGP  */

 static inline drm_map_t *drm_lookup_map(unsigned long offset,
 					unsigned long size, drm_device_t * dev)
 {
 	return NULL;
 }

 static inline void *agp_remap(unsigned long offset, unsigned long size,
 			      drm_device_t * dev)
 {
 	return NULL;
 }

 #endif				/* agp */

 void *drm_ioremap(unsigned long offset, unsigned long size,
 				drm_device_t * dev)
 {
 	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
 		drm_map_t *map = drm_lookup_map(offset, size, dev);

 		if (map && map->type == _DRM_AGP)
 			return agp_remap(offset, size, dev);
 	}
 	return ioremap(offset, size);
 }
 EXPORT_SYMBOL(drm_ioremap);

 #if 0
 void *drm_ioremap_nocache(unsigned long offset,
 					unsigned long size, drm_device_t * dev)
 {
 	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
 		drm_map_t *map = drm_lookup_map(offset, size, dev);

 		if (map && map->type == _DRM_AGP)
 			return agp_remap(offset, size, dev);
 	}
 	return ioremap_nocache(offset, size);
 }
 #endif  /*  0  */

 void drm_ioremapfree(void *pt, unsigned long size,
 				   drm_device_t * dev)
 {
 	/*
 	 * This is a bit ugly.  It would be much cleaner if the DRM API would use separate
 	 * routines for handling mappings in the AGP space.  Hopefully this can be done in
 	 * a future revision of the interface...
 	 */
 	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture
 	    && ((unsigned long)pt >= VMALLOC_START
 		&& (unsigned long)pt < VMALLOC_END)) {
 		unsigned long offset;
 		drm_map_t *map;

 		offset = drm_follow_page(pt) | ((unsigned long)pt & ~PAGE_MASK);
 		map = drm_lookup_map(offset, size, dev);
 		if (map && map->type == _DRM_AGP) {
 			vunmap(pt);
 			return;
 		}
 	}

 	iounmap(pt);
 }
 EXPORT_SYMBOL(drm_ioremapfree);

 #endif				/* debug_memory */
	/**
	* \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 "drmP.h"

	#ifdef DEBUG_MEMORY
	#include "drm_memory_debug.h"
	#else

	/** No-op. */
	void drm_mem_init(void)
	{
	}

	/**
	* Called when "/proc/dri/%dev%/mem" is read.
	*
	* \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.
	*
	* No-op.
	*/
	int drm_mem_info(char buf, char *start, off_t offset,
	int len, int eof, void data)
	{
	return 0;
	}

	/** Wrapper around kmalloc() and kfree() */
	void drm_realloc(void oldpt, size_t oldsize, size_t size, int area)
	{
	void *pt;

	if (!(pt = kmalloc(size, GFP_KERNEL)))
	return NULL;
	if (oldpt && oldsize) {
	memcpy(pt, oldpt, oldsize);
	kfree(oldpt);
	}
	return pt;
	}

	#if __OS_HAS_AGP
	/*
	* Find the drm_map that covers the range [offset, offset+size).
	*/
	static drm_map_t *drm_lookup_map(unsigned long offset,
	unsigned long size, drm_device_t * dev)
	{
	struct list_head *list;
	drm_map_list_t *r_list;
	drm_map_t *map;

	list_for_each(list, &dev->maplist->head) {
	r_list = (drm_map_list_t *) list;
	map = r_list->map;
	if (!map)
	continue;
	if (map->offset <= offset
	&& (offset + size) <= (map->offset + map->size))
	return map;
	}
	return NULL;
	}

	static void *agp_remap(unsigned long offset, unsigned long size,
	drm_device_t * dev)
	{
	unsigned long *phys_addr_map, i, num_pages =
	PAGE_ALIGN(size) / PAGE_SIZE;
	struct drm_agp_mem *agpmem;
	struct page **page_map;
	void *addr;

	size = PAGE_ALIGN(size);

	#ifdef __alpha__
	offset -= dev->hose->mem_space->start;
	#endif

	for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
	if (agpmem->bound <= offset
	&& (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
	(offset + size))
	break;
	if (!agpmem)
	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_addr_map =
	agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
	for (i = 0; i < num_pages; ++i)
	page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
	vfree(page_map);

	return addr;
	}

	/** Wrapper around agp_allocate_memory() */
	DRM_AGP_MEM drm_alloc_agp(drm_device_t dev, int pages, u32 type)
	{
	return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
	}

	/** Wrapper around agp_free_memory() */
	int drm_free_agp(DRM_AGP_MEM * handle, int pages)
	{
	return drm_agp_free_memory(handle) ? 0 : -EINVAL;
	}

	/** Wrapper around agp_bind_memory() */
	int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
	{
	return drm_agp_bind_memory(handle, start);
	}

	/** Wrapper around agp_unbind_memory() */
	int drm_unbind_agp(DRM_AGP_MEM * handle)
	{
	return drm_agp_unbind_memory(handle);
	}

	#else /* __OS_HAS_AGP */

	static inline drm_map_t *drm_lookup_map(unsigned long offset,
	unsigned long size, drm_device_t * dev)
	{
	return NULL;
	}

	static inline void *agp_remap(unsigned long offset, unsigned long size,
	drm_device_t * dev)
	{
	return NULL;
	}

	#endif /* agp */

	void *drm_ioremap(unsigned long offset, unsigned long size,
	drm_device_t * dev)
	{
	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
	drm_map_t *map = drm_lookup_map(offset, size, dev);

	if (map && map->type == _DRM_AGP)
	return agp_remap(offset, size, dev);
	}
	return ioremap(offset, size);
	}
	EXPORT_SYMBOL(drm_ioremap);

	#if 0
	void *drm_ioremap_nocache(unsigned long offset,
	unsigned long size, drm_device_t * dev)
	{
	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
	drm_map_t *map = drm_lookup_map(offset, size, dev);

	if (map && map->type == _DRM_AGP)
	return agp_remap(offset, size, dev);
	}
	return ioremap_nocache(offset, size);
	}
	#endif /* 0 */

	void drm_ioremapfree(void *pt, unsigned long size,
	drm_device_t * dev)
	{
	/*
	* This is a bit ugly. It would be much cleaner if the DRM API would use separate
	* routines for handling mappings in the AGP space. Hopefully this can be done in
	* a future revision of the interface...
	*/
	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture
	&& ((unsigned long)pt >= VMALLOC_START
	&& (unsigned long)pt < VMALLOC_END)) {
	unsigned long offset;
	drm_map_t *map;

	offset = drm_follow_page(pt) \| ((unsigned long)pt & ~PAGE_MASK);
	map = drm_lookup_map(offset, size, dev);
	if (map && map->type == _DRM_AGP) {
	vunmap(pt);
	return;
	}
	}

	iounmap(pt);
	}
	EXPORT_SYMBOL(drm_ioremapfree);

	#endif /* debug_memory */