/** * \file drm_vm.c * Memory mapping for DRM * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * Created: Mon Jan  4 08:58:31 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 <drm/drmP.h>#include <linux/export.h>#if defined(__ia64__)#include <linux/efi.h>#include <linux/slab.h>#endif static void drm_vm_open(struct vm_area_struct *vma);static void drm_vm_close(struct vm_area_struct *vma); static pgprot_t drm_io_prot(struct drm_local_map *map,			    struct vm_area_struct *vma){	pgprot_t tmp = vm_get_page_prot(vma->vm_flags); #if defined(__i386__) || defined(__x86_64__)	if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))		tmp = pgprot_noncached(tmp);	else		tmp = pgprot_writecombine(tmp);#elif defined(__powerpc__)	pgprot_val(tmp) |= _PAGE_NO_CACHE;	if (map->type == _DRM_REGISTERS)		pgprot_val(tmp) |= _PAGE_GUARDED;#elif defined(__ia64__)	if (efi_range_is_wc(vma->vm_start, vma->vm_end -				    vma->vm_start))		tmp = pgprot_writecombine(tmp);	else		tmp = pgprot_noncached(tmp);#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)	tmp = pgprot_noncached(tmp);#endif	return tmp;} static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma){	pgprot_t tmp = vm_get_page_prot(vma->vm_flags); #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)	tmp |= _PAGE_NO_CACHE;#endif	return tmp;} /** * \c fault method for AGP virtual memory. * * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. * * Find the right map and if it's AGP memory find the real physical page to * map, get the page, increment the use count and return it. */#if __OS_HAS_AGPstatic int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	struct drm_file *priv = vma->vm_file->private_data;	struct drm_device *dev = priv->minor->dev;	struct drm_local_map *map = NULL;	struct drm_map_list *r_list;	struct drm_hash_item *hash; 	/*	 * Find the right map	 */	if (!drm_core_has_AGP(dev))		goto vm_fault_error; 	if (!dev->agp || !dev->agp->cant_use_aperture)		goto vm_fault_error; 	if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))		goto vm_fault_error; 	r_list = drm_hash_entry(hash, struct drm_map_list, hash);	map = r_list->map; 	if (map && map->type == _DRM_AGP) {		/*		 * Using vm_pgoff as a selector forces us to use this unusual		 * addressing scheme.		 */		resource_size_t offset = (unsigned long)vmf->virtual_address -			vma->vm_start;		resource_size_t baddr = map->offset + offset;		struct drm_agp_mem *agpmem;		struct page *page; #ifdef __alpha__		/*		 * Adjust to a bus-relative address		 */		baddr -= dev->hose->mem_space->start;#endif 		/*		 * It's AGP memory - find the real physical page to map		 */		list_for_each_entry(agpmem, &dev->agp->memory, head) {			if (agpmem->bound <= baddr &&			    agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)				break;		} 		if (&agpmem->head == &dev->agp->memory)			goto vm_fault_error; 		/*		 * Get the page, inc the use count, and return it		 */		offset = (baddr - agpmem->bound) >> PAGE_SHIFT;		page = agpmem->memory->pages[offset];		get_page(page);		vmf->page = page; 		DRM_DEBUG		    ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",		     (unsigned long long)baddr,		     agpmem->memory->pages[offset],		     (unsigned long long)offset,		     page_count(page));		return 0;	}vm_fault_error:	return VM_FAULT_SIGBUS;	/* Disallow mremap */}#else				/* __OS_HAS_AGP */static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	return VM_FAULT_SIGBUS;}#endif				/* __OS_HAS_AGP */ /** * \c nopage method for shared virtual memory. * * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. * * Get the mapping, find the real physical page to map, get the page, and * return it. */static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	struct drm_local_map *map = vma->vm_private_data;	unsigned long offset;	unsigned long i;	struct page *page; 	if (!map)		return VM_FAULT_SIGBUS;	/* Nothing allocated */ 	offset = (unsigned long)vmf->virtual_address - vma->vm_start;	i = (unsigned long)map->handle + offset;	page = vmalloc_to_page((void *)i);	if (!page)		return VM_FAULT_SIGBUS;	get_page(page);	vmf->page = page; 	DRM_DEBUG("shm_fault 0x%lx\n", offset);	return 0;} /** * \c close method for shared virtual memory. * * \param vma virtual memory area. * * Deletes map information if we are the last * person to close a mapping and it's not in the global maplist. */static void drm_vm_shm_close(struct vm_area_struct *vma){	struct drm_file *priv = vma->vm_file->private_data;	struct drm_device *dev = priv->minor->dev;	struct drm_vma_entry *pt, *temp;	struct drm_local_map *map;	struct drm_map_list *r_list;	int found_maps = 0; 	DRM_DEBUG("0x%08lx,0x%08lx\n",		  vma->vm_start, vma->vm_end - vma->vm_start);	atomic_dec(&dev->vma_count); 	map = vma->vm_private_data; 	mutex_lock(&dev->struct_mutex);	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {		if (pt->vma->vm_private_data == map)			found_maps++;		if (pt->vma == vma) {			list_del(&pt->head);			kfree(pt);		}	} 	/* We were the only map that was found */	if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {		/* Check to see if we are in the maplist, if we are not, then		 * we delete this mappings information.		 */		found_maps = 0;		list_for_each_entry(r_list, &dev->maplist, head) {			if (r_list->map == map)				found_maps++;		} 		if (!found_maps) {			drm_dma_handle_t dmah; 			switch (map->type) {			case _DRM_REGISTERS:			case _DRM_FRAME_BUFFER:				arch_phys_wc_del(map->mtrr);				iounmap(map->handle);				break;			case _DRM_SHM:				vfree(map->handle);				break;			case _DRM_AGP:			case _DRM_SCATTER_GATHER:				break;			case _DRM_CONSISTENT:				dmah.vaddr = map->handle;				dmah.busaddr = map->offset;				dmah.size = map->size;				__drm_pci_free(dev, &dmah);				break;			case _DRM_GEM:				DRM_ERROR("tried to rmmap GEM object\n");				break;			}			kfree(map);		}	}	mutex_unlock(&dev->struct_mutex);} /** * \c fault method for DMA virtual memory. * * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. * * Determine the page number from the page offset and get it from drm_device_dma::pagelist. */static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	struct drm_file *priv = vma->vm_file->private_data;	struct drm_device *dev = priv->minor->dev;	struct drm_device_dma *dma = dev->dma;	unsigned long offset;	unsigned long page_nr;	struct page *page; 	if (!dma)		return VM_FAULT_SIGBUS;	/* Error */	if (!dma->pagelist)		return VM_FAULT_SIGBUS;	/* Nothing allocated */ 	offset = (unsigned long)vmf->virtual_address - vma->vm_start;	/* vm_[pg]off[set] should be 0 */	page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */	page = virt_to_page((void *)dma->pagelist[page_nr]); 	get_page(page);	vmf->page = page; 	DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);	return 0;} /** * \c fault method for scatter-gather virtual memory. * * \param vma virtual memory area. * \param address access address. * \return pointer to the page structure. * * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. */static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	struct drm_local_map *map = vma->vm_private_data;	struct drm_file *priv = vma->vm_file->private_data;	struct drm_device *dev = priv->minor->dev;	struct drm_sg_mem *entry = dev->sg;	unsigned long offset;	unsigned long map_offset;	unsigned long page_offset;	struct page *page; 	if (!entry)		return VM_FAULT_SIGBUS;	/* Error */	if (!entry->pagelist)		return VM_FAULT_SIGBUS;	/* Nothing allocated */ 	offset = (unsigned long)vmf->virtual_address - vma->vm_start;	map_offset = map->offset - (unsigned long)dev->sg->virtual;	page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);	page = entry->pagelist[page_offset];	get_page(page);	vmf->page = page; 	return 0;} static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	return drm_do_vm_fault(vma, vmf);} static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	return drm_do_vm_shm_fault(vma, vmf);} static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	return drm_do_vm_dma_fault(vma, vmf);} static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf){	return drm_do_vm_sg_fault(vma, vmf);} /** AGP virtual memory operations */static const struct vm_operations_struct drm_vm_ops = {	.fault = drm_vm_fault,	.open = drm_vm_open,	.close = drm_vm_close,}; /** Shared virtual memory operations */static const struct vm_operations_struct drm_vm_shm_ops = {	.fault = drm_vm_shm_fault,	.open = drm_vm_open,	.close = drm_vm_shm_close,}; /** DMA virtual memory operations */static const struct vm_operations_struct drm_vm_dma_ops = {	.fault = drm_vm_dma_fault,	.open = drm_vm_open,	.close = drm_vm_close,}; /** Scatter-gather virtual memory operations */static const struct vm_operations_struct drm_vm_sg_ops = {	.fault = drm_vm_sg_fault,	.open = drm_vm_open,	.close = drm_vm_close,}; /** * \c open method for shared virtual memory. * * \param vma virtual memory area. * * Create a new drm_vma_entry structure as the \p vma private data entry and * add it to drm_device::vmalist. */void drm_vm_open_locked(struct drm_device *dev,		struct vm_area_struct *vma){	struct drm_vma_entry *vma_entry; 	DRM_DEBUG("0x%08lx,0x%08lx\n",		  vma->vm_start, vma->vm_end - vma->vm_start);	atomic_inc(&dev->vma_count); 	vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);	if (vma_entry) {		vma_entry->vma = vma;		vma_entry->pid = current->pid;		list_add(&vma_entry->head, &dev->vmalist);	}}EXPORT_SYMBOL_GPL(drm_vm_open_locked); static void drm_vm_open(struct vm_area_struct *vma){	struct drm_file *priv = vma->vm_file->private_data;	struct drm_device *dev = priv->minor->dev; 	mutex_lock(&dev->struct_mutex);	drm_vm_open_locked(dev, vma);	mutex_unlock(&dev->struct_mutex);} void drm_vm_close_locked(struct drm_device *dev,		struct vm_area_struct *vma){	struct drm_vma_entry *pt, *temp; 	DRM_DEBUG("0x%08lx,0x%08lx\n",		  vma->vm_start, vma->vm_end - vma->vm_start);	atomic_dec(&dev->vma_count); 	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {		if (pt->vma == vma) {			list_del(&pt->head);			kfree(pt);			break;		}	}} /** * \c close method for all virtual memory types. * * \param vma virtual memory area. * * Search the \p vma private data entry in drm_device::vmalist, unlink it, and * free it. */static void drm_vm_close(struct vm_area_struct *vma){	struct drm_file *priv = vma->vm_file->private_data;	struct drm_device *dev = priv->minor->dev; 	mutex_lock(&dev->struct_mutex);	drm_vm_close_locked(dev, vma);	mutex_unlock(&dev->struct_mutex);} /** * mmap DMA memory. * * \param file_priv DRM file private. * \param vma virtual memory area. * \return zero on success or a negative number on failure. * * Sets the virtual memory area operations structure to vm_dma_ops, the file * pointer, and calls vm_open(). */static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma){	struct drm_file *priv = filp->private_data;	struct drm_device *dev;	struct drm_device_dma *dma;	unsigned long length = vma->vm_end - vma->vm_start; 	dev = priv->minor->dev;	dma = dev->dma;	DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",		  vma->vm_start, vma->vm_end, vma->vm_pgoff); 	/* Length must match exact page count */	if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {		return -EINVAL;	} 	if (!capable(CAP_SYS_ADMIN) &&	    (dma->flags & _DRM_DMA_USE_PCI_RO)) {		vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);#if defined(__i386__) || defined(__x86_64__)		pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;#else

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