diff options
Diffstat (limited to 'drivers/gpu/drm/drm_vm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vm.c | 665 |
1 files changed, 0 insertions, 665 deletions
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c deleted file mode 100644 index 87c9fe55de..0000000000 --- a/drivers/gpu/drm/drm_vm.c +++ /dev/null @@ -1,665 +0,0 @@ -/* - * \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 <linux/export.h> -#include <linux/pci.h> -#include <linux/seq_file.h> -#include <linux/vmalloc.h> -#include <linux/pgtable.h> - -#if defined(__ia64__) -#include <linux/efi.h> -#include <linux/slab.h> -#endif -#include <linux/mem_encrypt.h> - -#include <drm/drm_device.h> -#include <drm/drm_drv.h> -#include <drm/drm_file.h> -#include <drm/drm_framebuffer.h> -#include <drm/drm_print.h> - -#include "drm_internal.h" -#include "drm_legacy.h" - -struct drm_vma_entry { - struct list_head head; - struct vm_area_struct *vma; - pid_t pid; -}; - -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__) || defined(__powerpc__) || \ - defined(__mips__) || defined(__loongarch__) - if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) - tmp = pgprot_noncached(tmp); - else - tmp = pgprot_writecombine(tmp); -#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__) - 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 = pgprot_noncached_wc(tmp); -#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 IS_ENABLED(CONFIG_AGP) -static vm_fault_t drm_vm_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - 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 (!dev->agp) - 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 = vmf->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 -static vm_fault_t drm_vm_fault(struct vm_fault *vmf) -{ - return VM_FAULT_SIGBUS; -} -#endif - -/* - * \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 vm_fault_t drm_vm_shm_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - 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 = vmf->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); - - 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) { - 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: - dma_free_coherent(dev->dev, - map->size, - map->handle, - map->offset); - break; - } - kfree(map); - } - } - mutex_unlock(&dev->struct_mutex); -} - -/* - * \c fault method for DMA virtual memory. - * - * \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 vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - 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 = vmf->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 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 vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - 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 = vmf->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; -} - -/** 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, -}; - -static 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); - - 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); - } -} - -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); -} - -static 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); - - 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)) { - vm_flags_clear(vma, VM_WRITE | VM_MAYWRITE); -#if defined(__i386__) || defined(__x86_64__) - pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; -#else - /* Ye gads this is ugly. With more thought - we could move this up higher and use - `protection_map' instead. */ - vma->vm_page_prot = - __pgprot(pte_val - (pte_wrprotect - (__pte(pgprot_val(vma->vm_page_prot))))); -#endif - } - - vma->vm_ops = &drm_vm_dma_ops; - - vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); - - drm_vm_open_locked(dev, vma); - return 0; -} - -static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) -{ -#ifdef __alpha__ - return dev->hose->dense_mem_base; -#else - return 0; -#endif -} - -/* - * mmap DMA memory. - * - * \param file_priv DRM file private. - * \param vma virtual memory area. - * \return zero on success or a negative number on failure. - * - * If the virtual memory area has no offset associated with it then it's a DMA - * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, - * checks that the restricted flag is not set, sets the virtual memory operations - * according to the mapping type and remaps the pages. Finally sets the file - * pointer and calls vm_open(). - */ -static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) -{ - struct drm_file *priv = filp->private_data; - struct drm_device *dev = priv->minor->dev; - struct drm_local_map *map = NULL; - resource_size_t offset = 0; - struct drm_hash_item *hash; - - DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", - vma->vm_start, vma->vm_end, vma->vm_pgoff); - - if (!priv->authenticated) - return -EACCES; - - /* We check for "dma". On Apple's UniNorth, it's valid to have - * the AGP mapped at physical address 0 - * --BenH. - */ - if (!vma->vm_pgoff -#if IS_ENABLED(CONFIG_AGP) - && (!dev->agp - || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) -#endif - ) - return drm_mmap_dma(filp, vma); - - if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { - DRM_ERROR("Could not find map\n"); - return -EINVAL; - } - - map = drm_hash_entry(hash, struct drm_map_list, hash)->map; - if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) - return -EPERM; - - /* Check for valid size. */ - if (map->size < vma->vm_end - vma->vm_start) - return -EINVAL; - - if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { - vm_flags_clear(vma, VM_WRITE | VM_MAYWRITE); -#if defined(__i386__) || defined(__x86_64__) - pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; -#else - /* Ye gads this is ugly. With more thought - we could move this up higher and use - `protection_map' instead. */ - vma->vm_page_prot = - __pgprot(pte_val - (pte_wrprotect - (__pte(pgprot_val(vma->vm_page_prot))))); -#endif - } - - switch (map->type) { -#if !defined(__arm__) - case _DRM_AGP: - if (dev->agp && dev->agp->cant_use_aperture) { - /* - * On some platforms we can't talk to bus dma address from the CPU, so for - * memory of type DRM_AGP, we'll deal with sorting out the real physical - * pages and mappings in fault() - */ -#if defined(__powerpc__) - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); -#endif - vma->vm_ops = &drm_vm_ops; - break; - } - fallthrough; /* to _DRM_FRAME_BUFFER... */ -#endif - case _DRM_FRAME_BUFFER: - case _DRM_REGISTERS: - offset = drm_core_get_reg_ofs(dev); - vma->vm_page_prot = drm_io_prot(map, vma); - if (io_remap_pfn_range(vma, vma->vm_start, - (map->offset + offset) >> PAGE_SHIFT, - vma->vm_end - vma->vm_start, - vma->vm_page_prot)) - return -EAGAIN; - DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," - " offset = 0x%llx\n", - map->type, - vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); - - vma->vm_ops = &drm_vm_ops; - break; - case _DRM_CONSISTENT: - /* Consistent memory is really like shared memory. But - * it's allocated in a different way, so avoid fault */ - if (remap_pfn_range(vma, vma->vm_start, - page_to_pfn(virt_to_page(map->handle)), - vma->vm_end - vma->vm_start, vma->vm_page_prot)) - return -EAGAIN; - vma->vm_page_prot = drm_dma_prot(map->type, vma); - fallthrough; /* to _DRM_SHM */ - case _DRM_SHM: - vma->vm_ops = &drm_vm_shm_ops; - vma->vm_private_data = (void *)map; - break; - case _DRM_SCATTER_GATHER: - vma->vm_ops = &drm_vm_sg_ops; - vma->vm_private_data = (void *)map; - vma->vm_page_prot = drm_dma_prot(map->type, vma); - break; - default: - return -EINVAL; /* This should never happen. */ - } - vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); - - drm_vm_open_locked(dev, vma); - return 0; -} - -int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma) -{ - struct drm_file *priv = filp->private_data; - struct drm_device *dev = priv->minor->dev; - int ret; - - if (drm_dev_is_unplugged(dev)) - return -ENODEV; - - mutex_lock(&dev->struct_mutex); - ret = drm_mmap_locked(filp, vma); - mutex_unlock(&dev->struct_mutex); - - return ret; -} -EXPORT_SYMBOL(drm_legacy_mmap); - -#if IS_ENABLED(CONFIG_DRM_LEGACY) -void drm_legacy_vma_flush(struct drm_device *dev) -{ - struct drm_vma_entry *vma, *vma_temp; - - /* Clear vma list (only needed for legacy drivers) */ - list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { - list_del(&vma->head); - kfree(vma); - } -} -#endif |