diff options
Diffstat (limited to 'drivers/gpu/drm/drm_vm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vm.c | 665 |
1 files changed, 665 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c new file mode 100644 index 000000000..f024dc939 --- /dev/null +++ b/drivers/gpu/drm/drm_vm.c @@ -0,0 +1,665 @@ +/* + * \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)) { + vma->vm_flags &= ~(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; + + vma->vm_flags |= 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)) { + vma->vm_flags &= ~(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. */ + } + vma->vm_flags |= 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 |