diff options
Diffstat (limited to 'drivers/gpu/drm/drm_bufs.c')
| -rw-r--r-- | drivers/gpu/drm/drm_bufs.c | 1608 |
1 files changed, 1608 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c new file mode 100644 index 000000000..7a01d0918 --- /dev/null +++ b/drivers/gpu/drm/drm_bufs.c @@ -0,0 +1,1608 @@ +/* + * Legacy: Generic DRM Buffer Management + * + * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * All Rights Reserved. + * + * Author: Rickard E. (Rik) Faith <faith@valinux.com> + * Author: Gareth Hughes <gareth@valinux.com> + * + * 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/log2.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/nospec.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/vmalloc.h> + +#include <asm/shmparam.h> + +#include <drm/drm_agpsupport.h> +#include <drm/drm_device.h> +#include <drm/drm_drv.h> +#include <drm/drm_file.h> +#include <drm/drm_print.h> + +#include "drm_legacy.h" + + +static struct drm_map_list *drm_find_matching_map(struct drm_device *dev, + struct drm_local_map *map) +{ + struct drm_map_list *entry; + + list_for_each_entry(entry, &dev->maplist, head) { + /* + * Because the kernel-userspace ABI is fixed at a 32-bit offset + * while PCI resources may live above that, we only compare the + * lower 32 bits of the map offset for maps of type + * _DRM_FRAMEBUFFER or _DRM_REGISTERS. + * It is assumed that if a driver have more than one resource + * of each type, the lower 32 bits are different. + */ + if (!entry->map || + map->type != entry->map->type || + entry->master != dev->master) + continue; + switch (map->type) { + case _DRM_SHM: + if (map->flags != _DRM_CONTAINS_LOCK) + break; + return entry; + case _DRM_REGISTERS: + case _DRM_FRAME_BUFFER: + if ((entry->map->offset & 0xffffffff) == + (map->offset & 0xffffffff)) + return entry; + default: /* Make gcc happy */ + ; + } + if (entry->map->offset == map->offset) + return entry; + } + + return NULL; +} + +static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash, + unsigned long user_token, int hashed_handle, int shm) +{ + int use_hashed_handle, shift; + unsigned long add; + +#if (BITS_PER_LONG == 64) + use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle); +#elif (BITS_PER_LONG == 32) + use_hashed_handle = hashed_handle; +#else +#error Unsupported long size. Neither 64 nor 32 bits. +#endif + + if (!use_hashed_handle) { + int ret; + + hash->key = user_token >> PAGE_SHIFT; + ret = drm_ht_insert_item(&dev->map_hash, hash); + if (ret != -EINVAL) + return ret; + } + + shift = 0; + add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT; + if (shm && (SHMLBA > PAGE_SIZE)) { + int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1; + + /* For shared memory, we have to preserve the SHMLBA + * bits of the eventual vma->vm_pgoff value during + * mmap(). Otherwise we run into cache aliasing problems + * on some platforms. On these platforms, the pgoff of + * a mmap() request is used to pick a suitable virtual + * address for the mmap() region such that it will not + * cause cache aliasing problems. + * + * Therefore, make sure the SHMLBA relevant bits of the + * hash value we use are equal to those in the original + * kernel virtual address. + */ + shift = bits; + add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL)); + } + + return drm_ht_just_insert_please(&dev->map_hash, hash, + user_token, 32 - PAGE_SHIFT - 3, + shift, add); +} + +/* + * Core function to create a range of memory available for mapping by a + * non-root process. + * + * Adjusts the memory offset to its absolute value according to the mapping + * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where + * applicable and if supported by the kernel. + */ +static int drm_addmap_core(struct drm_device *dev, resource_size_t offset, + unsigned int size, enum drm_map_type type, + enum drm_map_flags flags, + struct drm_map_list **maplist) +{ + struct drm_local_map *map; + struct drm_map_list *list; + unsigned long user_token; + int ret; + + map = kmalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return -ENOMEM; + + map->offset = offset; + map->size = size; + map->flags = flags; + map->type = type; + + /* Only allow shared memory to be removable since we only keep enough + * book keeping information about shared memory to allow for removal + * when processes fork. + */ + if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) { + kfree(map); + return -EINVAL; + } + DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n", + (unsigned long long)map->offset, map->size, map->type); + + /* page-align _DRM_SHM maps. They are allocated here so there is no security + * hole created by that and it works around various broken drivers that use + * a non-aligned quantity to map the SAREA. --BenH + */ + if (map->type == _DRM_SHM) + map->size = PAGE_ALIGN(map->size); + + if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) { + kfree(map); + return -EINVAL; + } + map->mtrr = -1; + map->handle = NULL; + + switch (map->type) { + case _DRM_REGISTERS: + case _DRM_FRAME_BUFFER: +#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__) + if (map->offset + (map->size-1) < map->offset || + map->offset < virt_to_phys(high_memory)) { + kfree(map); + return -EINVAL; + } +#endif + /* Some drivers preinitialize some maps, without the X Server + * needing to be aware of it. Therefore, we just return success + * when the server tries to create a duplicate map. + */ + list = drm_find_matching_map(dev, map); + if (list != NULL) { + if (list->map->size != map->size) { + DRM_DEBUG("Matching maps of type %d with " + "mismatched sizes, (%ld vs %ld)\n", + map->type, map->size, + list->map->size); + list->map->size = map->size; + } + + kfree(map); + *maplist = list; + return 0; + } + + if (map->type == _DRM_FRAME_BUFFER || + (map->flags & _DRM_WRITE_COMBINING)) { + map->mtrr = + arch_phys_wc_add(map->offset, map->size); + } + if (map->type == _DRM_REGISTERS) { + if (map->flags & _DRM_WRITE_COMBINING) + map->handle = ioremap_wc(map->offset, + map->size); + else + map->handle = ioremap(map->offset, map->size); + if (!map->handle) { + kfree(map); + return -ENOMEM; + } + } + + break; + case _DRM_SHM: + list = drm_find_matching_map(dev, map); + if (list != NULL) { + if (list->map->size != map->size) { + DRM_DEBUG("Matching maps of type %d with " + "mismatched sizes, (%ld vs %ld)\n", + map->type, map->size, list->map->size); + list->map->size = map->size; + } + + kfree(map); + *maplist = list; + return 0; + } + map->handle = vmalloc_user(map->size); + DRM_DEBUG("%lu %d %p\n", + map->size, order_base_2(map->size), map->handle); + if (!map->handle) { + kfree(map); + return -ENOMEM; + } + map->offset = (unsigned long)map->handle; + if (map->flags & _DRM_CONTAINS_LOCK) { + /* Prevent a 2nd X Server from creating a 2nd lock */ + if (dev->master->lock.hw_lock != NULL) { + vfree(map->handle); + kfree(map); + return -EBUSY; + } + dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */ + } + break; + case _DRM_AGP: { + struct drm_agp_mem *entry; + int valid = 0; + + if (!dev->agp) { + kfree(map); + return -EINVAL; + } +#ifdef __alpha__ + map->offset += dev->hose->mem_space->start; +#endif + /* In some cases (i810 driver), user space may have already + * added the AGP base itself, because dev->agp->base previously + * only got set during AGP enable. So, only add the base + * address if the map's offset isn't already within the + * aperture. + */ + if (map->offset < dev->agp->base || + map->offset > dev->agp->base + + dev->agp->agp_info.aper_size * 1024 * 1024 - 1) { + map->offset += dev->agp->base; + } + map->mtrr = dev->agp->agp_mtrr; /* for getmap */ + + /* This assumes the DRM is in total control of AGP space. + * It's not always the case as AGP can be in the control + * of user space (i.e. i810 driver). So this loop will get + * skipped and we double check that dev->agp->memory is + * actually set as well as being invalid before EPERM'ing + */ + list_for_each_entry(entry, &dev->agp->memory, head) { + if ((map->offset >= entry->bound) && + (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) { + valid = 1; + break; + } + } + if (!list_empty(&dev->agp->memory) && !valid) { + kfree(map); + return -EPERM; + } + DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n", + (unsigned long long)map->offset, map->size); + + break; + } + case _DRM_SCATTER_GATHER: + if (!dev->sg) { + kfree(map); + return -EINVAL; + } + map->offset += (unsigned long)dev->sg->virtual; + break; + case _DRM_CONSISTENT: + /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G, + * As we're limiting the address to 2^32-1 (or less), + * casting it down to 32 bits is no problem, but we + * need to point to a 64bit variable first. */ + map->handle = dma_alloc_coherent(&dev->pdev->dev, + map->size, + &map->offset, + GFP_KERNEL); + if (!map->handle) { + kfree(map); + return -ENOMEM; + } + break; + default: + kfree(map); + return -EINVAL; + } + + list = kzalloc(sizeof(*list), GFP_KERNEL); + if (!list) { + if (map->type == _DRM_REGISTERS) + iounmap(map->handle); + kfree(map); + return -EINVAL; + } + list->map = map; + + mutex_lock(&dev->struct_mutex); + list_add(&list->head, &dev->maplist); + + /* Assign a 32-bit handle */ + /* We do it here so that dev->struct_mutex protects the increment */ + user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle : + map->offset; + ret = drm_map_handle(dev, &list->hash, user_token, 0, + (map->type == _DRM_SHM)); + if (ret) { + if (map->type == _DRM_REGISTERS) + iounmap(map->handle); + kfree(map); + kfree(list); + mutex_unlock(&dev->struct_mutex); + return ret; + } + + list->user_token = list->hash.key << PAGE_SHIFT; + mutex_unlock(&dev->struct_mutex); + + if (!(map->flags & _DRM_DRIVER)) + list->master = dev->master; + *maplist = list; + return 0; +} + +int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset, + unsigned int size, enum drm_map_type type, + enum drm_map_flags flags, struct drm_local_map **map_ptr) +{ + struct drm_map_list *list; + int rc; + + rc = drm_addmap_core(dev, offset, size, type, flags, &list); + if (!rc) + *map_ptr = list->map; + return rc; +} +EXPORT_SYMBOL(drm_legacy_addmap); + +struct drm_local_map *drm_legacy_findmap(struct drm_device *dev, + unsigned int token) +{ + struct drm_map_list *_entry; + + list_for_each_entry(_entry, &dev->maplist, head) + if (_entry->user_token == token) + return _entry->map; + return NULL; +} +EXPORT_SYMBOL(drm_legacy_findmap); + +/* + * Ioctl to specify a range of memory that is available for mapping by a + * non-root process. + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg pointer to a drm_map structure. + * \return zero on success or a negative value on error. + * + */ +int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_map *map = data; + struct drm_map_list *maplist; + int err; + + if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM)) + return -EPERM; + + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && + !drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + err = drm_addmap_core(dev, map->offset, map->size, map->type, + map->flags, &maplist); + + if (err) + return err; + + /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */ + map->handle = (void *)(unsigned long)maplist->user_token; + + /* + * It appears that there are no users of this value whatsoever -- + * drmAddMap just discards it. Let's not encourage its use. + * (Keeping drm_addmap_core's returned mtrr value would be wrong -- + * it's not a real mtrr index anymore.) + */ + map->mtrr = -1; + + return 0; +} + +/* + * Get a mapping information. + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg user argument, pointing to a drm_map structure. + * + * \return zero on success or a negative number on failure. + * + * Searches for the mapping with the specified offset and copies its information + * into userspace + */ +int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_map *map = data; + struct drm_map_list *r_list = NULL; + struct list_head *list; + int idx; + int i; + + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && + !drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + idx = map->offset; + if (idx < 0) + return -EINVAL; + + i = 0; + mutex_lock(&dev->struct_mutex); + list_for_each(list, &dev->maplist) { + if (i == idx) { + r_list = list_entry(list, struct drm_map_list, head); + break; + } + i++; + } + if (!r_list || !r_list->map) { + mutex_unlock(&dev->struct_mutex); + return -EINVAL; + } + + map->offset = r_list->map->offset; + map->size = r_list->map->size; + map->type = r_list->map->type; + map->flags = r_list->map->flags; + map->handle = (void *)(unsigned long) r_list->user_token; + map->mtrr = arch_phys_wc_index(r_list->map->mtrr); + + mutex_unlock(&dev->struct_mutex); + + return 0; +} + +/* + * Remove a map private from list and deallocate resources if the mapping + * isn't in use. + * + * Searches the map on drm_device::maplist, removes it from the list, see if + * it's being used, and free any associated resource (such as MTRR's) if it's not + * being on use. + * + * \sa drm_legacy_addmap + */ +int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map) +{ + struct drm_map_list *r_list = NULL, *list_t; + int found = 0; + struct drm_master *master; + + /* Find the list entry for the map and remove it */ + list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) { + if (r_list->map == map) { + master = r_list->master; + list_del(&r_list->head); + drm_ht_remove_key(&dev->map_hash, + r_list->user_token >> PAGE_SHIFT); + kfree(r_list); + found = 1; + break; + } + } + + if (!found) + return -EINVAL; + + switch (map->type) { + case _DRM_REGISTERS: + iounmap(map->handle); + fallthrough; + case _DRM_FRAME_BUFFER: + arch_phys_wc_del(map->mtrr); + break; + case _DRM_SHM: + vfree(map->handle); + if (master) { + if (dev->sigdata.lock == master->lock.hw_lock) + dev->sigdata.lock = NULL; + master->lock.hw_lock = NULL; /* SHM removed */ + master->lock.file_priv = NULL; + wake_up_interruptible_all(&master->lock.lock_queue); + } + break; + case _DRM_AGP: + case _DRM_SCATTER_GATHER: + break; + case _DRM_CONSISTENT: + dma_free_coherent(&dev->pdev->dev, + map->size, + map->handle, + map->offset); + break; + } + kfree(map); + + return 0; +} +EXPORT_SYMBOL(drm_legacy_rmmap_locked); + +void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map) +{ + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && + !drm_core_check_feature(dev, DRIVER_LEGACY)) + return; + + mutex_lock(&dev->struct_mutex); + drm_legacy_rmmap_locked(dev, map); + mutex_unlock(&dev->struct_mutex); +} +EXPORT_SYMBOL(drm_legacy_rmmap); + +void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master) +{ + struct drm_map_list *r_list, *list_temp; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return; + + mutex_lock(&dev->struct_mutex); + list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { + if (r_list->master == master) { + drm_legacy_rmmap_locked(dev, r_list->map); + r_list = NULL; + } + } + mutex_unlock(&dev->struct_mutex); +} + +void drm_legacy_rmmaps(struct drm_device *dev) +{ + struct drm_map_list *r_list, *list_temp; + + list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) + drm_legacy_rmmap(dev, r_list->map); +} + +/* The rmmap ioctl appears to be unnecessary. All mappings are torn down on + * the last close of the device, and this is necessary for cleanup when things + * exit uncleanly. Therefore, having userland manually remove mappings seems + * like a pointless exercise since they're going away anyway. + * + * One use case might be after addmap is allowed for normal users for SHM and + * gets used by drivers that the server doesn't need to care about. This seems + * unlikely. + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg pointer to a struct drm_map structure. + * \return zero on success or a negative value on error. + */ +int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_map *request = data; + struct drm_local_map *map = NULL; + struct drm_map_list *r_list; + int ret; + + if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && + !drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + mutex_lock(&dev->struct_mutex); + list_for_each_entry(r_list, &dev->maplist, head) { + if (r_list->map && + r_list->user_token == (unsigned long)request->handle && + r_list->map->flags & _DRM_REMOVABLE) { + map = r_list->map; + break; + } + } + + /* List has wrapped around to the head pointer, or it's empty we didn't + * find anything. + */ + if (list_empty(&dev->maplist) || !map) { + mutex_unlock(&dev->struct_mutex); + return -EINVAL; + } + + /* Register and framebuffer maps are permanent */ + if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) { + mutex_unlock(&dev->struct_mutex); + return 0; + } + + ret = drm_legacy_rmmap_locked(dev, map); + + mutex_unlock(&dev->struct_mutex); + + return ret; +} + +/* + * Cleanup after an error on one of the addbufs() functions. + * + * \param dev DRM device. + * \param entry buffer entry where the error occurred. + * + * Frees any pages and buffers associated with the given entry. + */ +static void drm_cleanup_buf_error(struct drm_device *dev, + struct drm_buf_entry *entry) +{ + int i; + + if (entry->seg_count) { + for (i = 0; i < entry->seg_count; i++) { + if (entry->seglist[i]) { + drm_pci_free(dev, entry->seglist[i]); + } + } + kfree(entry->seglist); + + entry->seg_count = 0; + } + + if (entry->buf_count) { + for (i = 0; i < entry->buf_count; i++) { + kfree(entry->buflist[i].dev_private); + } + kfree(entry->buflist); + + entry->buf_count = 0; + } +} + +#if IS_ENABLED(CONFIG_AGP) +/* + * Add AGP buffers for DMA transfers. + * + * \param dev struct drm_device to which the buffers are to be added. + * \param request pointer to a struct drm_buf_desc describing the request. + * \return zero on success or a negative number on failure. + * + * After some sanity checks creates a drm_buf structure for each buffer and + * reallocates the buffer list of the same size order to accommodate the new + * buffers. + */ +int drm_legacy_addbufs_agp(struct drm_device *dev, + struct drm_buf_desc *request) +{ + struct drm_device_dma *dma = dev->dma; + struct drm_buf_entry *entry; + struct drm_agp_mem *agp_entry; + struct drm_buf *buf; + unsigned long offset; + unsigned long agp_offset; + int count; + int order; + int size; + int alignment; + int page_order; + int total; + int byte_count; + int i, valid; + struct drm_buf **temp_buflist; + + if (!dma) + return -EINVAL; + + count = request->count; + order = order_base_2(request->size); + size = 1 << order; + + alignment = (request->flags & _DRM_PAGE_ALIGN) + ? PAGE_ALIGN(size) : size; + page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; + total = PAGE_SIZE << page_order; + + byte_count = 0; + agp_offset = dev->agp->base + request->agp_start; + + DRM_DEBUG("count: %d\n", count); + DRM_DEBUG("order: %d\n", order); + DRM_DEBUG("size: %d\n", size); + DRM_DEBUG("agp_offset: %lx\n", agp_offset); + DRM_DEBUG("alignment: %d\n", alignment); + DRM_DEBUG("page_order: %d\n", page_order); + DRM_DEBUG("total: %d\n", total); + + if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) + return -EINVAL; + + /* Make sure buffers are located in AGP memory that we own */ + valid = 0; + list_for_each_entry(agp_entry, &dev->agp->memory, head) { + if ((agp_offset >= agp_entry->bound) && + (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) { + valid = 1; + break; + } + } + if (!list_empty(&dev->agp->memory) && !valid) { + DRM_DEBUG("zone invalid\n"); + return -EINVAL; + } + spin_lock(&dev->buf_lock); + if (dev->buf_use) { + spin_unlock(&dev->buf_lock); + return -EBUSY; + } + atomic_inc(&dev->buf_alloc); + spin_unlock(&dev->buf_lock); + + mutex_lock(&dev->struct_mutex); + entry = &dma->bufs[order]; + if (entry->buf_count) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; /* May only call once for each order */ + } + + if (count < 0 || count > 4096) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -EINVAL; + } + + entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL); + if (!entry->buflist) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + entry->buf_size = size; + entry->page_order = page_order; + + offset = 0; + + while (entry->buf_count < count) { + buf = &entry->buflist[entry->buf_count]; + buf->idx = dma->buf_count + entry->buf_count; + buf->total = alignment; + buf->order = order; + buf->used = 0; + + buf->offset = (dma->byte_count + offset); + buf->bus_address = agp_offset + offset; + buf->address = (void *)(agp_offset + offset); + buf->next = NULL; + buf->waiting = 0; + buf->pending = 0; + buf->file_priv = NULL; + + buf->dev_priv_size = dev->driver->dev_priv_size; + buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL); + if (!buf->dev_private) { + /* Set count correctly so we free the proper amount. */ + entry->buf_count = count; + drm_cleanup_buf_error(dev, entry); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); + + offset += alignment; + entry->buf_count++; + byte_count += PAGE_SIZE << page_order; + } + + DRM_DEBUG("byte_count: %d\n", byte_count); + + temp_buflist = krealloc(dma->buflist, + (dma->buf_count + entry->buf_count) * + sizeof(*dma->buflist), GFP_KERNEL); + if (!temp_buflist) { + /* Free the entry because it isn't valid */ + drm_cleanup_buf_error(dev, entry); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + dma->buflist = temp_buflist; + + for (i = 0; i < entry->buf_count; i++) { + dma->buflist[i + dma->buf_count] = &entry->buflist[i]; + } + + dma->buf_count += entry->buf_count; + dma->seg_count += entry->seg_count; + dma->page_count += byte_count >> PAGE_SHIFT; + dma->byte_count += byte_count; + + DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); + DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); + + mutex_unlock(&dev->struct_mutex); + + request->count = entry->buf_count; + request->size = size; + + dma->flags = _DRM_DMA_USE_AGP; + + atomic_dec(&dev->buf_alloc); + return 0; +} +EXPORT_SYMBOL(drm_legacy_addbufs_agp); +#endif /* CONFIG_AGP */ + +int drm_legacy_addbufs_pci(struct drm_device *dev, + struct drm_buf_desc *request) +{ + struct drm_device_dma *dma = dev->dma; + int count; + int order; + int size; + int total; + int page_order; + struct drm_buf_entry *entry; + drm_dma_handle_t *dmah; + struct drm_buf *buf; + int alignment; + unsigned long offset; + int i; + int byte_count; + int page_count; + unsigned long *temp_pagelist; + struct drm_buf **temp_buflist; + + if (!drm_core_check_feature(dev, DRIVER_PCI_DMA)) + return -EOPNOTSUPP; + + if (!dma) + return -EINVAL; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + count = request->count; + order = order_base_2(request->size); + size = 1 << order; + + DRM_DEBUG("count=%d, size=%d (%d), order=%d\n", + request->count, request->size, size, order); + + if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) + return -EINVAL; + + alignment = (request->flags & _DRM_PAGE_ALIGN) + ? PAGE_ALIGN(size) : size; + page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; + total = PAGE_SIZE << page_order; + + spin_lock(&dev->buf_lock); + if (dev->buf_use) { + spin_unlock(&dev->buf_lock); + return -EBUSY; + } + atomic_inc(&dev->buf_alloc); + spin_unlock(&dev->buf_lock); + + mutex_lock(&dev->struct_mutex); + entry = &dma->bufs[order]; + if (entry->buf_count) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; /* May only call once for each order */ + } + + if (count < 0 || count > 4096) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -EINVAL; + } + + entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL); + if (!entry->buflist) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL); + if (!entry->seglist) { + kfree(entry->buflist); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + /* Keep the original pagelist until we know all the allocations + * have succeeded + */ + temp_pagelist = kmalloc_array(dma->page_count + (count << page_order), + sizeof(*dma->pagelist), + GFP_KERNEL); + if (!temp_pagelist) { + kfree(entry->buflist); + kfree(entry->seglist); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + memcpy(temp_pagelist, + dma->pagelist, dma->page_count * sizeof(*dma->pagelist)); + DRM_DEBUG("pagelist: %d entries\n", + dma->page_count + (count << page_order)); + + entry->buf_size = size; + entry->page_order = page_order; + byte_count = 0; + page_count = 0; + + while (entry->buf_count < count) { + + dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000); + + if (!dmah) { + /* Set count correctly so we free the proper amount. */ + entry->buf_count = count; + entry->seg_count = count; + drm_cleanup_buf_error(dev, entry); + kfree(temp_pagelist); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + entry->seglist[entry->seg_count++] = dmah; + for (i = 0; i < (1 << page_order); i++) { + DRM_DEBUG("page %d @ 0x%08lx\n", + dma->page_count + page_count, + (unsigned long)dmah->vaddr + PAGE_SIZE * i); + temp_pagelist[dma->page_count + page_count++] + = (unsigned long)dmah->vaddr + PAGE_SIZE * i; + } + for (offset = 0; + offset + size <= total && entry->buf_count < count; + offset += alignment, ++entry->buf_count) { + buf = &entry->buflist[entry->buf_count]; + buf->idx = dma->buf_count + entry->buf_count; + buf->total = alignment; + buf->order = order; + buf->used = 0; + buf->offset = (dma->byte_count + byte_count + offset); + buf->address = (void *)(dmah->vaddr + offset); + buf->bus_address = dmah->busaddr + offset; + buf->next = NULL; + buf->waiting = 0; + buf->pending = 0; + buf->file_priv = NULL; + + buf->dev_priv_size = dev->driver->dev_priv_size; + buf->dev_private = kzalloc(buf->dev_priv_size, + GFP_KERNEL); + if (!buf->dev_private) { + /* Set count correctly so we free the proper amount. */ + entry->buf_count = count; + entry->seg_count = count; + drm_cleanup_buf_error(dev, entry); + kfree(temp_pagelist); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + DRM_DEBUG("buffer %d @ %p\n", + entry->buf_count, buf->address); + } + byte_count += PAGE_SIZE << page_order; + } + + temp_buflist = krealloc(dma->buflist, + (dma->buf_count + entry->buf_count) * + sizeof(*dma->buflist), GFP_KERNEL); + if (!temp_buflist) { + /* Free the entry because it isn't valid */ + drm_cleanup_buf_error(dev, entry); + kfree(temp_pagelist); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + dma->buflist = temp_buflist; + + for (i = 0; i < entry->buf_count; i++) { + dma->buflist[i + dma->buf_count] = &entry->buflist[i]; + } + + /* No allocations failed, so now we can replace the original pagelist + * with the new one. + */ + if (dma->page_count) { + kfree(dma->pagelist); + } + dma->pagelist = temp_pagelist; + + dma->buf_count += entry->buf_count; + dma->seg_count += entry->seg_count; + dma->page_count += entry->seg_count << page_order; + dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order); + + mutex_unlock(&dev->struct_mutex); + + request->count = entry->buf_count; + request->size = size; + + if (request->flags & _DRM_PCI_BUFFER_RO) + dma->flags = _DRM_DMA_USE_PCI_RO; + + atomic_dec(&dev->buf_alloc); + return 0; + +} +EXPORT_SYMBOL(drm_legacy_addbufs_pci); + +static int drm_legacy_addbufs_sg(struct drm_device *dev, + struct drm_buf_desc *request) +{ + struct drm_device_dma *dma = dev->dma; + struct drm_buf_entry *entry; + struct drm_buf *buf; + unsigned long offset; + unsigned long agp_offset; + int count; + int order; + int size; + int alignment; + int page_order; + int total; + int byte_count; + int i; + struct drm_buf **temp_buflist; + + if (!drm_core_check_feature(dev, DRIVER_SG)) + return -EOPNOTSUPP; + + if (!dma) + return -EINVAL; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + count = request->count; + order = order_base_2(request->size); + size = 1 << order; + + alignment = (request->flags & _DRM_PAGE_ALIGN) + ? PAGE_ALIGN(size) : size; + page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; + total = PAGE_SIZE << page_order; + + byte_count = 0; + agp_offset = request->agp_start; + + DRM_DEBUG("count: %d\n", count); + DRM_DEBUG("order: %d\n", order); + DRM_DEBUG("size: %d\n", size); + DRM_DEBUG("agp_offset: %lu\n", agp_offset); + DRM_DEBUG("alignment: %d\n", alignment); + DRM_DEBUG("page_order: %d\n", page_order); + DRM_DEBUG("total: %d\n", total); + + if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) + return -EINVAL; + + spin_lock(&dev->buf_lock); + if (dev->buf_use) { + spin_unlock(&dev->buf_lock); + return -EBUSY; + } + atomic_inc(&dev->buf_alloc); + spin_unlock(&dev->buf_lock); + + mutex_lock(&dev->struct_mutex); + entry = &dma->bufs[order]; + if (entry->buf_count) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; /* May only call once for each order */ + } + + if (count < 0 || count > 4096) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -EINVAL; + } + + entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL); + if (!entry->buflist) { + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + entry->buf_size = size; + entry->page_order = page_order; + + offset = 0; + + while (entry->buf_count < count) { + buf = &entry->buflist[entry->buf_count]; + buf->idx = dma->buf_count + entry->buf_count; + buf->total = alignment; + buf->order = order; + buf->used = 0; + + buf->offset = (dma->byte_count + offset); + buf->bus_address = agp_offset + offset; + buf->address = (void *)(agp_offset + offset + + (unsigned long)dev->sg->virtual); + buf->next = NULL; + buf->waiting = 0; + buf->pending = 0; + buf->file_priv = NULL; + + buf->dev_priv_size = dev->driver->dev_priv_size; + buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL); + if (!buf->dev_private) { + /* Set count correctly so we free the proper amount. */ + entry->buf_count = count; + drm_cleanup_buf_error(dev, entry); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + + DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); + + offset += alignment; + entry->buf_count++; + byte_count += PAGE_SIZE << page_order; + } + + DRM_DEBUG("byte_count: %d\n", byte_count); + + temp_buflist = krealloc(dma->buflist, + (dma->buf_count + entry->buf_count) * + sizeof(*dma->buflist), GFP_KERNEL); + if (!temp_buflist) { + /* Free the entry because it isn't valid */ + drm_cleanup_buf_error(dev, entry); + mutex_unlock(&dev->struct_mutex); + atomic_dec(&dev->buf_alloc); + return -ENOMEM; + } + dma->buflist = temp_buflist; + + for (i = 0; i < entry->buf_count; i++) { + dma->buflist[i + dma->buf_count] = &entry->buflist[i]; + } + + dma->buf_count += entry->buf_count; + dma->seg_count += entry->seg_count; + dma->page_count += byte_count >> PAGE_SHIFT; + dma->byte_count += byte_count; + + DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); + DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); + + mutex_unlock(&dev->struct_mutex); + + request->count = entry->buf_count; + request->size = size; + + dma->flags = _DRM_DMA_USE_SG; + + atomic_dec(&dev->buf_alloc); + return 0; +} + +/* + * Add buffers for DMA transfers (ioctl). + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg pointer to a struct drm_buf_desc request. + * \return zero on success or a negative number on failure. + * + * According with the memory type specified in drm_buf_desc::flags and the + * build options, it dispatches the call either to addbufs_agp(), + * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent + * PCI memory respectively. + */ +int drm_legacy_addbufs(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_buf_desc *request = data; + int ret; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) + return -EOPNOTSUPP; + +#if IS_ENABLED(CONFIG_AGP) + if (request->flags & _DRM_AGP_BUFFER) + ret = drm_legacy_addbufs_agp(dev, request); + else +#endif + if (request->flags & _DRM_SG_BUFFER) + ret = drm_legacy_addbufs_sg(dev, request); + else if (request->flags & _DRM_FB_BUFFER) + ret = -EINVAL; + else + ret = drm_legacy_addbufs_pci(dev, request); + + return ret; +} + +/* + * Get information about the buffer mappings. + * + * This was originally mean for debugging purposes, or by a sophisticated + * client library to determine how best to use the available buffers (e.g., + * large buffers can be used for image transfer). + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg pointer to a drm_buf_info structure. + * \return zero on success or a negative number on failure. + * + * Increments drm_device::buf_use while holding the drm_device::buf_lock + * lock, preventing of allocating more buffers after this call. Information + * about each requested buffer is then copied into user space. + */ +int __drm_legacy_infobufs(struct drm_device *dev, + void *data, int *p, + int (*f)(void *, int, struct drm_buf_entry *)) +{ + struct drm_device_dma *dma = dev->dma; + int i; + int count; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) + return -EOPNOTSUPP; + + if (!dma) + return -EINVAL; + + spin_lock(&dev->buf_lock); + if (atomic_read(&dev->buf_alloc)) { + spin_unlock(&dev->buf_lock); + return -EBUSY; + } + ++dev->buf_use; /* Can't allocate more after this call */ + spin_unlock(&dev->buf_lock); + + for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { + if (dma->bufs[i].buf_count) + ++count; + } + + DRM_DEBUG("count = %d\n", count); + + if (*p >= count) { + for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { + struct drm_buf_entry *from = &dma->bufs[i]; + + if (from->buf_count) { + if (f(data, count, from) < 0) + return -EFAULT; + DRM_DEBUG("%d %d %d %d %d\n", + i, + dma->bufs[i].buf_count, + dma->bufs[i].buf_size, + dma->bufs[i].low_mark, + dma->bufs[i].high_mark); + ++count; + } + } + } + *p = count; + + return 0; +} + +static int copy_one_buf(void *data, int count, struct drm_buf_entry *from) +{ + struct drm_buf_info *request = data; + struct drm_buf_desc __user *to = &request->list[count]; + struct drm_buf_desc v = {.count = from->buf_count, + .size = from->buf_size, + .low_mark = from->low_mark, + .high_mark = from->high_mark}; + + if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags))) + return -EFAULT; + return 0; +} + +int drm_legacy_infobufs(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_buf_info *request = data; + + return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf); +} + +/* + * Specifies a low and high water mark for buffer allocation + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg a pointer to a drm_buf_desc structure. + * \return zero on success or a negative number on failure. + * + * Verifies that the size order is bounded between the admissible orders and + * updates the respective drm_device_dma::bufs entry low and high water mark. + * + * \note This ioctl is deprecated and mostly never used. + */ +int drm_legacy_markbufs(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_device_dma *dma = dev->dma; + struct drm_buf_desc *request = data; + int order; + struct drm_buf_entry *entry; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) + return -EOPNOTSUPP; + + if (!dma) + return -EINVAL; + + DRM_DEBUG("%d, %d, %d\n", + request->size, request->low_mark, request->high_mark); + order = order_base_2(request->size); + if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) + return -EINVAL; + entry = &dma->bufs[order]; + + if (request->low_mark < 0 || request->low_mark > entry->buf_count) + return -EINVAL; + if (request->high_mark < 0 || request->high_mark > entry->buf_count) + return -EINVAL; + + entry->low_mark = request->low_mark; + entry->high_mark = request->high_mark; + + return 0; +} + +/* + * Unreserve the buffers in list, previously reserved using drmDMA. + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg pointer to a drm_buf_free structure. + * \return zero on success or a negative number on failure. + * + * Calls free_buffer() for each used buffer. + * This function is primarily used for debugging. + */ +int drm_legacy_freebufs(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_device_dma *dma = dev->dma; + struct drm_buf_free *request = data; + int i; + int idx; + struct drm_buf *buf; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) + return -EOPNOTSUPP; + + if (!dma) + return -EINVAL; + + DRM_DEBUG("%d\n", request->count); + for (i = 0; i < request->count; i++) { + if (copy_from_user(&idx, &request->list[i], sizeof(idx))) + return -EFAULT; + if (idx < 0 || idx >= dma->buf_count) { + DRM_ERROR("Index %d (of %d max)\n", + idx, dma->buf_count - 1); + return -EINVAL; + } + idx = array_index_nospec(idx, dma->buf_count); + buf = dma->buflist[idx]; + if (buf->file_priv != file_priv) { + DRM_ERROR("Process %d freeing buffer not owned\n", + task_pid_nr(current)); + return -EINVAL; + } + drm_legacy_free_buffer(dev, buf); + } + + return 0; +} + +/* + * Maps all of the DMA buffers into client-virtual space (ioctl). + * + * \param inode device inode. + * \param file_priv DRM file private. + * \param cmd command. + * \param arg pointer to a drm_buf_map structure. + * \return zero on success or a negative number on failure. + * + * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information + * about each buffer into user space. For PCI buffers, it calls vm_mmap() with + * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls + * drm_mmap_dma(). + */ +int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p, + void __user **v, + int (*f)(void *, int, unsigned long, + struct drm_buf *), + struct drm_file *file_priv) +{ + struct drm_device_dma *dma = dev->dma; + int retcode = 0; + unsigned long virtual; + int i; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) + return -EOPNOTSUPP; + + if (!dma) + return -EINVAL; + + spin_lock(&dev->buf_lock); + if (atomic_read(&dev->buf_alloc)) { + spin_unlock(&dev->buf_lock); + return -EBUSY; + } + dev->buf_use++; /* Can't allocate more after this call */ + spin_unlock(&dev->buf_lock); + + if (*p >= dma->buf_count) { + if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP)) + || (drm_core_check_feature(dev, DRIVER_SG) + && (dma->flags & _DRM_DMA_USE_SG))) { + struct drm_local_map *map = dev->agp_buffer_map; + unsigned long token = dev->agp_buffer_token; + + if (!map) { + retcode = -EINVAL; + goto done; + } + virtual = vm_mmap(file_priv->filp, 0, map->size, + PROT_READ | PROT_WRITE, + MAP_SHARED, + token); + } else { + virtual = vm_mmap(file_priv->filp, 0, dma->byte_count, + PROT_READ | PROT_WRITE, + MAP_SHARED, 0); + } + if (virtual > -1024UL) { + /* Real error */ + retcode = (signed long)virtual; + goto done; + } + *v = (void __user *)virtual; + + for (i = 0; i < dma->buf_count; i++) { + if (f(data, i, virtual, dma->buflist[i]) < 0) { + retcode = -EFAULT; + goto done; + } + } + } + done: + *p = dma->buf_count; + DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode); + + return retcode; +} + +static int map_one_buf(void *data, int idx, unsigned long virtual, + struct drm_buf *buf) +{ + struct drm_buf_map *request = data; + unsigned long address = virtual + buf->offset; /* *** */ + + if (copy_to_user(&request->list[idx].idx, &buf->idx, + sizeof(request->list[0].idx))) + return -EFAULT; + if (copy_to_user(&request->list[idx].total, &buf->total, + sizeof(request->list[0].total))) + return -EFAULT; + if (clear_user(&request->list[idx].used, sizeof(int))) + return -EFAULT; + if (copy_to_user(&request->list[idx].address, &address, + sizeof(address))) + return -EFAULT; + return 0; +} + +int drm_legacy_mapbufs(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_buf_map *request = data; + + return __drm_legacy_mapbufs(dev, data, &request->count, + &request->virtual, map_one_buf, + file_priv); +} + +int drm_legacy_dma_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EOPNOTSUPP; + + if (dev->driver->dma_ioctl) + return dev->driver->dma_ioctl(dev, data, file_priv); + else + return -EINVAL; +} + +struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev) +{ + struct drm_map_list *entry; + + list_for_each_entry(entry, &dev->maplist, head) { + if (entry->map && entry->map->type == _DRM_SHM && + (entry->map->flags & _DRM_CONTAINS_LOCK)) { + return entry->map; + } + } + return NULL; +} +EXPORT_SYMBOL(drm_legacy_getsarea); |