diff options
Diffstat (limited to 'drivers/char/drm/drm_vm.c')
| -rw-r--r-- | drivers/char/drm/drm_vm.c | 678 |
1 files changed, 678 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c new file mode 100644 index 000000000000..fc72f30f312b --- /dev/null +++ b/drivers/char/drm/drm_vm.c @@ -0,0 +1,678 @@ +/** + * \file drm_vm.h + * 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 "drmP.h" +#if defined(__ia64__) +#include <linux/efi.h> +#endif + + +/** + * \c nopage 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_AGP +static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, + unsigned long address) +{ + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + drm_map_t *map = NULL; + drm_map_list_t *r_list; + struct list_head *list; + + /* + * Find the right map + */ + if (!drm_core_has_AGP(dev)) + goto vm_nopage_error; + + if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error; + + list_for_each(list, &dev->maplist->head) { + r_list = list_entry(list, drm_map_list_t, head); + map = r_list->map; + if (!map) continue; + if (map->offset == VM_OFFSET(vma)) break; + } + + if (map && map->type == _DRM_AGP) { + unsigned long offset = address - vma->vm_start; + unsigned long baddr = VM_OFFSET(vma) + 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 + */ + for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) { + if (agpmem->bound <= baddr && + agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) + break; + } + + if (!agpmem) goto vm_nopage_error; + + /* + * Get the page, inc the use count, and return it + */ + offset = (baddr - agpmem->bound) >> PAGE_SHIFT; + page = virt_to_page(__va(agpmem->memory->memory[offset])); + get_page(page); + + DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", + baddr, __va(agpmem->memory->memory[offset]), offset, + page_count(page)); + + return page; + } +vm_nopage_error: + return NOPAGE_SIGBUS; /* Disallow mremap */ +} +#else /* __OS_HAS_AGP */ +static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, + unsigned long address) +{ + return NOPAGE_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 the mapping, find the real physical page to map, get the page, and + * return it. + */ +static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, + unsigned long address) +{ + drm_map_t *map = (drm_map_t *)vma->vm_private_data; + unsigned long offset; + unsigned long i; + struct page *page; + + if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ + if (!map) return NOPAGE_OOM; /* Nothing allocated */ + + offset = address - vma->vm_start; + i = (unsigned long)map->handle + offset; + page = vmalloc_to_page((void *)i); + if (!page) + return NOPAGE_OOM; + get_page(page); + + DRM_DEBUG("shm_nopage 0x%lx\n", address); + return page; +} + + +/** + * \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. + */ +void drm_vm_shm_close(struct vm_area_struct *vma) +{ + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + drm_vma_entry_t *pt, *prev, *next; + drm_map_t *map; + drm_map_list_t *r_list; + struct list_head *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; + + down(&dev->struct_sem); + for (pt = dev->vmalist, prev = NULL; pt; pt = next) { + next = pt->next; + if (pt->vma->vm_private_data == map) found_maps++; + if (pt->vma == vma) { + if (prev) { + prev->next = pt->next; + } else { + dev->vmalist = pt->next; + } + drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); + } else { + prev = 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 = &dev->maplist->head; + list_for_each(list, &dev->maplist->head) { + r_list = list_entry(list, drm_map_list_t, head); + if (r_list->map == map) found_maps++; + } + + if(!found_maps) { + switch (map->type) { + case _DRM_REGISTERS: + case _DRM_FRAME_BUFFER: + if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { + int retcode; + retcode = mtrr_del(map->mtrr, + map->offset, + map->size); + DRM_DEBUG("mtrr_del = %d\n", retcode); + } + drm_ioremapfree(map->handle, map->size, dev); + break; + case _DRM_SHM: + vfree(map->handle); + break; + case _DRM_AGP: + case _DRM_SCATTER_GATHER: + break; + } + drm_free(map, sizeof(*map), DRM_MEM_MAPS); + } + } + up(&dev->struct_sem); +} + +/** + * \c nopage 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 __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, + unsigned long address) +{ + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + drm_device_dma_t *dma = dev->dma; + unsigned long offset; + unsigned long page_nr; + struct page *page; + + if (!dma) return NOPAGE_SIGBUS; /* Error */ + if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ + if (!dma->pagelist) return NOPAGE_OOM ; /* Nothing allocated */ + + offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ + page_nr = offset >> PAGE_SHIFT; + page = virt_to_page((dma->pagelist[page_nr] + + (offset & (~PAGE_MASK)))); + + get_page(page); + + DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); + return page; +} + +/** + * \c nopage 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 __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, + unsigned long address) +{ + drm_map_t *map = (drm_map_t *)vma->vm_private_data; + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + drm_sg_mem_t *entry = dev->sg; + unsigned long offset; + unsigned long map_offset; + unsigned long page_offset; + struct page *page; + + if (!entry) return NOPAGE_SIGBUS; /* Error */ + if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */ + if (!entry->pagelist) return NOPAGE_OOM ; /* Nothing allocated */ + + + offset = address - vma->vm_start; + map_offset = map->offset - dev->sg->handle; + page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); + page = entry->pagelist[page_offset]; + get_page(page); + + return page; +} + + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) + +static struct page *drm_vm_nopage(struct vm_area_struct *vma, + unsigned long address, + int *type) { + if (type) *type = VM_FAULT_MINOR; + return drm_do_vm_nopage(vma, address); +} + +static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, + unsigned long address, + int *type) { + if (type) *type = VM_FAULT_MINOR; + return drm_do_vm_shm_nopage(vma, address); +} + +static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, + unsigned long address, + int *type) { + if (type) *type = VM_FAULT_MINOR; + return drm_do_vm_dma_nopage(vma, address); +} + +static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, + unsigned long address, + int *type) { + if (type) *type = VM_FAULT_MINOR; + return drm_do_vm_sg_nopage(vma, address); +} + +#else /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */ + +static struct page *drm_vm_nopage(struct vm_area_struct *vma, + unsigned long address, + int unused) { + return drm_do_vm_nopage(vma, address); +} + +static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, + unsigned long address, + int unused) { + return drm_do_vm_shm_nopage(vma, address); +} + +static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, + unsigned long address, + int unused) { + return drm_do_vm_dma_nopage(vma, address); +} + +static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, + unsigned long address, + int unused) { + return drm_do_vm_sg_nopage(vma, address); +} + +#endif + + +/** AGP virtual memory operations */ +static struct vm_operations_struct drm_vm_ops = { + .nopage = drm_vm_nopage, + .open = drm_vm_open, + .close = drm_vm_close, +}; + +/** Shared virtual memory operations */ +static struct vm_operations_struct drm_vm_shm_ops = { + .nopage = drm_vm_shm_nopage, + .open = drm_vm_open, + .close = drm_vm_shm_close, +}; + +/** DMA virtual memory operations */ +static struct vm_operations_struct drm_vm_dma_ops = { + .nopage = drm_vm_dma_nopage, + .open = drm_vm_open, + .close = drm_vm_close, +}; + +/** Scatter-gather virtual memory operations */ +static struct vm_operations_struct drm_vm_sg_ops = { + .nopage = drm_vm_sg_nopage, + .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(struct vm_area_struct *vma) +{ + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + drm_vma_entry_t *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 = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); + if (vma_entry) { + down(&dev->struct_sem); + vma_entry->vma = vma; + vma_entry->next = dev->vmalist; + vma_entry->pid = current->pid; + dev->vmalist = vma_entry; + up(&dev->struct_sem); + } +} + +/** + * \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. + */ +void drm_vm_close(struct vm_area_struct *vma) +{ + drm_file_t *priv = vma->vm_file->private_data; + drm_device_t *dev = priv->head->dev; + drm_vma_entry_t *pt, *prev; + + DRM_DEBUG("0x%08lx,0x%08lx\n", + vma->vm_start, vma->vm_end - vma->vm_start); + atomic_dec(&dev->vma_count); + + down(&dev->struct_sem); + for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { + if (pt->vma == vma) { + if (prev) { + prev->next = pt->next; + } else { + dev->vmalist = pt->next; + } + drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); + break; + } + } + up(&dev->struct_sem); +} + +/** + * mmap DMA memory. + * + * \param filp file pointer. + * \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(). + */ +int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev; + drm_device_dma_t *dma; + unsigned long length = vma->vm_end - vma->vm_start; + + lock_kernel(); + dev = priv->head->dev; + dma = dev->dma; + DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", + vma->vm_start, vma->vm_end, VM_OFFSET(vma)); + + /* Length must match exact page count */ + if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { + unlock_kernel(); + return -EINVAL; + } + unlock_kernel(); + + vma->vm_ops = &drm_vm_dma_ops; + +#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */ + vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */ +#else + vma->vm_flags |= VM_RESERVED; /* Don't swap */ +#endif + + vma->vm_file = filp; /* Needed for drm_vm_open() */ + drm_vm_open(vma); + return 0; +} + +unsigned long drm_core_get_map_ofs(drm_map_t *map) +{ + return map->offset; +} +EXPORT_SYMBOL(drm_core_get_map_ofs); + +unsigned long drm_core_get_reg_ofs(struct drm_device *dev) +{ +#ifdef __alpha__ + return dev->hose->dense_mem_base - dev->hose->mem_space->start; +#else + return 0; +#endif +} +EXPORT_SYMBOL(drm_core_get_reg_ofs); + +/** + * mmap DMA memory. + * + * \param filp file pointer. + * \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(). + */ +int drm_mmap(struct file *filp, struct vm_area_struct *vma) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_map_t *map = NULL; + drm_map_list_t *r_list; + unsigned long offset = 0; + struct list_head *list; + + DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", + vma->vm_start, vma->vm_end, VM_OFFSET(vma)); + + 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 (!VM_OFFSET(vma) +#if __OS_HAS_AGP + && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) +#endif + ) + return drm_mmap_dma(filp, vma); + + /* A sequential search of a linked list is + fine here because: 1) there will only be + about 5-10 entries in the list and, 2) a + DRI client only has to do this mapping + once, so it doesn't have to be optimized + for performance, even if the list was a + bit longer. */ + list_for_each(list, &dev->maplist->head) { + unsigned long off; + + r_list = list_entry(list, drm_map_list_t, head); + map = r_list->map; + if (!map) continue; + off = dev->driver->get_map_ofs(map); + if (off == VM_OFFSET(vma)) break; + } + + 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) { + case _DRM_AGP: + if (drm_core_has_AGP(dev) && 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 nopage() + */ +#if defined(__powerpc__) + pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; +#endif + vma->vm_ops = &drm_vm_ops; + break; + } + /* fall through to _DRM_FRAME_BUFFER... */ + case _DRM_FRAME_BUFFER: + case _DRM_REGISTERS: + if (VM_OFFSET(vma) >= __pa(high_memory)) { +#if defined(__i386__) || defined(__x86_64__) + if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) { + pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; + pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT; + } +#elif defined(__powerpc__) + pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED; +#endif + vma->vm_flags |= VM_IO; /* not in core dump */ + } +#if defined(__ia64__) + if (efi_range_is_wc(vma->vm_start, vma->vm_end - + vma->vm_start)) + vma->vm_page_prot = + pgprot_writecombine(vma->vm_page_prot); + else + vma->vm_page_prot = + pgprot_noncached(vma->vm_page_prot); +#endif + offset = dev->driver->get_reg_ofs(dev); +#ifdef __sparc__ + if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start, + (VM_OFFSET(vma) + offset) >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) +#else + if (io_remap_pfn_range(vma, vma->vm_start, + (VM_OFFSET(vma) + offset) >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) +#endif + return -EAGAIN; + DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," + " offset = 0x%lx\n", + map->type, + vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset); + vma->vm_ops = &drm_vm_ops; + break; + case _DRM_SHM: + vma->vm_ops = &drm_vm_shm_ops; + vma->vm_private_data = (void *)map; + /* Don't let this area swap. Change when + DRM_KERNEL advisory is supported. */ +#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */ + vma->vm_flags |= VM_LOCKED; +#else + vma->vm_flags |= VM_RESERVED; +#endif + break; + case _DRM_SCATTER_GATHER: + vma->vm_ops = &drm_vm_sg_ops; + vma->vm_private_data = (void *)map; +#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */ + vma->vm_flags |= VM_LOCKED; +#else + vma->vm_flags |= VM_RESERVED; +#endif + break; + default: + return -EINVAL; /* This should never happen. */ + } +#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */ + vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */ +#else + vma->vm_flags |= VM_RESERVED; /* Don't swap */ +#endif + + vma->vm_file = filp; /* Needed for drm_vm_open() */ + drm_vm_open(vma); + return 0; +} +EXPORT_SYMBOL(drm_mmap); |