| /** |
| * \file drm_bufs.c |
| * Generic buffer template |
| * |
| * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| * \author Gareth Hughes <gareth@valinux.com> |
| */ |
| |
| /* |
| * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com |
| * |
| * Copyright 1999, 2000 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/vmalloc.h> |
| #include "drmP.h" |
| |
| unsigned long drm_get_resource_start(struct drm_device *dev, unsigned int resource) |
| { |
| return pci_resource_start(dev->pdev, resource); |
| } |
| EXPORT_SYMBOL(drm_get_resource_start); |
| |
| unsigned long drm_get_resource_len(struct drm_device *dev, unsigned int resource) |
| { |
| return pci_resource_len(dev->pdev, resource); |
| } |
| |
| EXPORT_SYMBOL(drm_get_resource_len); |
| |
| static struct drm_map_list *drm_find_matching_map(struct drm_device *dev, |
| drm_local_map_t *map) |
| { |
| struct drm_map_list *entry; |
| list_for_each_entry(entry, &dev->maplist, head) { |
| if (entry->map && (entry->master == dev->primary->master) && (map->type == entry->map->type) && |
| ((entry->map->offset == map->offset) || |
| ((map->type == _DRM_SHM) && (map->flags&_DRM_CONTAINS_LOCK)))) { |
| 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 use_hashed_handle; |
| #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; |
| } |
| return drm_ht_just_insert_please(&dev->map_hash, hash, |
| user_token, 32 - PAGE_SHIFT - 3, |
| 0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT); |
| } |
| |
| /** |
| * 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. |
| * |
| * 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, unsigned int offset, |
| unsigned int size, enum drm_map_type type, |
| enum drm_map_flags flags, |
| struct drm_map_list ** maplist) |
| { |
| struct drm_map *map; |
| struct drm_map_list *list; |
| drm_dma_handle_t *dmah; |
| unsigned long user_token; |
| int ret; |
| |
| map = drm_alloc(sizeof(*map), DRM_MEM_MAPS); |
| 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) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -EINVAL; |
| } |
| DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n", |
| map->offset, map->size, map->type); |
| if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| 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__) |
| if (map->offset + (map->size-1) < map->offset || |
| map->offset < virt_to_phys(high_memory)) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -EINVAL; |
| } |
| #endif |
| #ifdef __alpha__ |
| map->offset += dev->hose->mem_space->start; |
| #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; |
| } |
| |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| *maplist = list; |
| return 0; |
| } |
| |
| if (drm_core_has_MTRR(dev)) { |
| if (map->type == _DRM_FRAME_BUFFER || |
| (map->flags & _DRM_WRITE_COMBINING)) { |
| map->mtrr = mtrr_add(map->offset, map->size, |
| MTRR_TYPE_WRCOMB, 1); |
| } |
| } |
| if (map->type == _DRM_REGISTERS) { |
| map->handle = ioremap(map->offset, map->size); |
| if (!map->handle) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| 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; |
| } |
| |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| *maplist = list; |
| return 0; |
| } |
| map->handle = vmalloc_user(map->size); |
| DRM_DEBUG("%lu %d %p\n", |
| map->size, drm_order(map->size), map->handle); |
| if (!map->handle) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| 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->primary->master->lock.hw_lock != NULL) { |
| vfree(map->handle); |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -EBUSY; |
| } |
| dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */ |
| } |
| break; |
| case _DRM_AGP: { |
| struct drm_agp_mem *entry; |
| int valid = 0; |
| |
| if (!drm_core_has_AGP(dev)) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| 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) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -EPERM; |
| } |
| DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size); |
| |
| break; |
| case _DRM_GEM: |
| DRM_ERROR("tried to rmmap GEM object\n"); |
| break; |
| } |
| case _DRM_SCATTER_GATHER: |
| if (!dev->sg) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| 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. */ |
| dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL); |
| if (!dmah) { |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -ENOMEM; |
| } |
| map->handle = dmah->vaddr; |
| map->offset = (unsigned long)dmah->busaddr; |
| kfree(dmah); |
| break; |
| default: |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -EINVAL; |
| } |
| |
| list = drm_alloc(sizeof(*list), DRM_MEM_MAPS); |
| if (!list) { |
| if (map->type == _DRM_REGISTERS) |
| iounmap(map->handle); |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| return -EINVAL; |
| } |
| memset(list, 0, sizeof(*list)); |
| 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); |
| if (ret) { |
| if (map->type == _DRM_REGISTERS) |
| iounmap(map->handle); |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| drm_free(list, sizeof(*list), DRM_MEM_MAPS); |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| } |
| |
| list->user_token = list->hash.key << PAGE_SHIFT; |
| mutex_unlock(&dev->struct_mutex); |
| |
| list->master = dev->primary->master; |
| *maplist = list; |
| return 0; |
| } |
| |
| int drm_addmap(struct drm_device * dev, unsigned int offset, |
| unsigned int size, enum drm_map_type type, |
| enum drm_map_flags flags, drm_local_map_t ** 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_addmap); |
| |
| int drm_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; |
| |
| 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; |
| return 0; |
| } |
| |
| /** |
| * Remove a map private from list and deallocate resources if the mapping |
| * isn't in use. |
| * |
| * \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. |
| * |
| * Searches the map on drm_device::maplist, removes it from the list, see if |
| * its being used, and free any associate resource (such as MTRR's) if it's not |
| * being on use. |
| * |
| * \sa drm_addmap |
| */ |
| int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map) |
| { |
| struct drm_map_list *r_list = NULL, *list_t; |
| drm_dma_handle_t dmah; |
| 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); |
| drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS); |
| found = 1; |
| break; |
| } |
| } |
| |
| if (!found) |
| return -EINVAL; |
| |
| switch (map->type) { |
| case _DRM_REGISTERS: |
| iounmap(map->handle); |
| /* FALLTHROUGH */ |
| 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); |
| } |
| 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(&master->lock.lock_queue); |
| } |
| break; |
| case _DRM_AGP: |
| case _DRM_SCATTER_GATHER: |
| break; |
| case _DRM_CONSISTENT: |
| dmah.vaddr = map->handle; |
| dmah.busaddr = map->offset; |
| dmah.size = map->size; |
| __drm_pci_free(dev, &dmah); |
| break; |
| case _DRM_GEM: |
| DRM_ERROR("tried to rmmap GEM object\n"); |
| break; |
| } |
| drm_free(map, sizeof(*map), DRM_MEM_MAPS); |
| |
| return 0; |
| } |
| |
| int drm_rmmap(struct drm_device *dev, drm_local_map_t *map) |
| { |
| int ret; |
| |
| mutex_lock(&dev->struct_mutex); |
| ret = drm_rmmap_locked(dev, map); |
| mutex_unlock(&dev->struct_mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_rmmap); |
| |
| /* 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. |
| */ |
| int drm_rmmap_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_map *request = data; |
| drm_local_map_t *map = NULL; |
| struct drm_map_list *r_list; |
| int ret; |
| |
| 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 its 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_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]); |
| } |
| } |
| drm_free(entry->seglist, |
| entry->seg_count * |
| sizeof(*entry->seglist), DRM_MEM_SEGS); |
| |
| entry->seg_count = 0; |
| } |
| |
| if (entry->buf_count) { |
| for (i = 0; i < entry->buf_count; i++) { |
| if (entry->buflist[i].dev_private) { |
| drm_free(entry->buflist[i].dev_private, |
| entry->buflist[i].dev_priv_size, |
| DRM_MEM_BUFS); |
| } |
| } |
| drm_free(entry->buflist, |
| entry->buf_count * |
| sizeof(*entry->buflist), DRM_MEM_BUFS); |
| |
| entry->buf_count = 0; |
| } |
| } |
| |
| #if __OS_HAS_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_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 = drm_order(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; |
| if (dev->queue_count) |
| return -EBUSY; /* Not while in use */ |
| |
| /* 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->count_lock); |
| if (dev->buf_use) { |
| spin_unlock(&dev->count_lock); |
| return -EBUSY; |
| } |
| atomic_inc(&dev->buf_alloc); |
| spin_unlock(&dev->count_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 = drm_alloc(count * sizeof(*entry->buflist), |
| DRM_MEM_BUFS); |
| if (!entry->buflist) { |
| mutex_unlock(&dev->struct_mutex); |
| atomic_dec(&dev->buf_alloc); |
| return -ENOMEM; |
| } |
| memset(entry->buflist, 0, count * sizeof(*entry->buflist)); |
| |
| 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; |
| init_waitqueue_head(&buf->dma_wait); |
| buf->file_priv = NULL; |
| |
| buf->dev_priv_size = dev->driver->dev_priv_size; |
| buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS); |
| 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; |
| } |
| memset(buf->dev_private, 0, buf->dev_priv_size); |
| |
| 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 = drm_realloc(dma->buflist, |
| dma->buf_count * sizeof(*dma->buflist), |
| (dma->buf_count + entry->buf_count) |
| * sizeof(*dma->buflist), DRM_MEM_BUFS); |
| 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_addbufs_agp); |
| #endif /* __OS_HAS_AGP */ |
| |
| int drm_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 -EINVAL; |
| |
| if (!dma) |
| return -EINVAL; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| count = request->count; |
| order = drm_order(request->size); |
| size = 1 << order; |
| |
| DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n", |
| request->count, request->size, size, order, dev->queue_count); |
| |
| if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) |
| return -EINVAL; |
| if (dev->queue_count) |
| return -EBUSY; /* Not while in use */ |
| |
| 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->count_lock); |
| if (dev->buf_use) { |
| spin_unlock(&dev->count_lock); |
| return -EBUSY; |
| } |
| atomic_inc(&dev->buf_alloc); |
| spin_unlock(&dev->count_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 = drm_alloc(count * sizeof(*entry->buflist), |
| DRM_MEM_BUFS); |
| if (!entry->buflist) { |
| mutex_unlock(&dev->struct_mutex); |
| atomic_dec(&dev->buf_alloc); |
| return -ENOMEM; |
| } |
| memset(entry->buflist, 0, count * sizeof(*entry->buflist)); |
| |
| entry->seglist = drm_alloc(count * sizeof(*entry->seglist), |
| DRM_MEM_SEGS); |
| if (!entry->seglist) { |
| drm_free(entry->buflist, |
| count * sizeof(*entry->buflist), DRM_MEM_BUFS); |
| mutex_unlock(&dev->struct_mutex); |
| atomic_dec(&dev->buf_alloc); |
| return -ENOMEM; |
| } |
| memset(entry->seglist, 0, count * sizeof(*entry->seglist)); |
| |
| /* Keep the original pagelist until we know all the allocations |
| * have succeeded |
| */ |
| temp_pagelist = drm_alloc((dma->page_count + (count << page_order)) |
| * sizeof(*dma->pagelist), DRM_MEM_PAGES); |
| if (!temp_pagelist) { |
| drm_free(entry->buflist, |
| count * sizeof(*entry->buflist), DRM_MEM_BUFS); |
| drm_free(entry->seglist, |
| count * sizeof(*entry->seglist), DRM_MEM_SEGS); |
| 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, 0xfffffffful); |
| |
| 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); |
| drm_free(temp_pagelist, |
| (dma->page_count + (count << page_order)) |
| * sizeof(*dma->pagelist), DRM_MEM_PAGES); |
| 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; |
| init_waitqueue_head(&buf->dma_wait); |
| buf->file_priv = NULL; |
| |
| buf->dev_priv_size = dev->driver->dev_priv_size; |
| buf->dev_private = drm_alloc(buf->dev_priv_size, |
| DRM_MEM_BUFS); |
| 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); |
| drm_free(temp_pagelist, |
| (dma->page_count + |
| (count << page_order)) |
| * sizeof(*dma->pagelist), |
| DRM_MEM_PAGES); |
| mutex_unlock(&dev->struct_mutex); |
| atomic_dec(&dev->buf_alloc); |
| return -ENOMEM; |
| } |
| memset(buf->dev_private, 0, buf->dev_priv_size); |
| |
| DRM_DEBUG("buffer %d @ %p\n", |
| entry->buf_count, buf->address); |
| } |
| byte_count += PAGE_SIZE << page_order; |
| } |
| |
| temp_buflist = drm_realloc(dma->buflist, |
| dma->buf_count * sizeof(*dma->buflist), |
| (dma->buf_count + entry->buf_count) |
| * sizeof(*dma->buflist), DRM_MEM_BUFS); |
| if (!temp_buflist) { |
| /* Free the entry because it isn't valid */ |
| drm_cleanup_buf_error(dev, entry); |
| drm_free(temp_pagelist, |
| (dma->page_count + (count << page_order)) |
| * sizeof(*dma->pagelist), DRM_MEM_PAGES); |
| 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 orginal pagelist |
| * with the new one. |
| */ |
| if (dma->page_count) { |
| drm_free(dma->pagelist, |
| dma->page_count * sizeof(*dma->pagelist), |
| DRM_MEM_PAGES); |
| } |
| 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_addbufs_pci); |
| |
| static int drm_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 -EINVAL; |
| |
| if (!dma) |
| return -EINVAL; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| count = request->count; |
| order = drm_order(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; |
| if (dev->queue_count) |
| return -EBUSY; /* Not while in use */ |
| |
| spin_lock(&dev->count_lock); |
| if (dev->buf_use) { |
| spin_unlock(&dev->count_lock); |
| return -EBUSY; |
| } |
| atomic_inc(&dev->buf_alloc); |
| spin_unlock(&dev->count_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 = drm_alloc(count * sizeof(*entry->buflist), |
| DRM_MEM_BUFS); |
| if (!entry->buflist) { |
| mutex_unlock(&dev->struct_mutex); |
| atomic_dec(&dev->buf_alloc); |
| return -ENOMEM; |
| } |
| memset(entry->buflist, 0, count * sizeof(*entry->buflist)); |
| |
| 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; |
| init_waitqueue_head(&buf->dma_wait); |
| buf->file_priv = NULL; |
| |
| buf->dev_priv_size = dev->driver->dev_priv_size; |
| buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS); |
| 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; |
| } |
| |
| memset(buf->dev_private, 0, buf->dev_priv_size); |
| |
| 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 = drm_realloc(dma->buflist, |
| dma->buf_count * sizeof(*dma->buflist), |
| (dma->buf_count + entry->buf_count) |
| * sizeof(*dma->buflist), DRM_MEM_BUFS); |
| 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; |
| } |
| |
| static int drm_addbufs_fb(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_FB_DMA)) |
| return -EINVAL; |
| |
| if (!dma) |
| return -EINVAL; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| count = request->count; |
| order = drm_order(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; |
| if (dev->queue_count) |
| return -EBUSY; /* Not while in use */ |
| |
| spin_lock(&dev->count_lock); |
| if (dev->buf_use) { |
| spin_unlock(&dev->count_lock); |
| return -EBUSY; |
| } |
| atomic_inc(&dev->buf_alloc); |
| spin_unlock(&dev->count_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 = drm_alloc(count * sizeof(*entry->buflist), |
| DRM_MEM_BUFS); |
| if (!entry->buflist) { |
| mutex_unlock(&dev->struct_mutex); |
| atomic_dec(&dev->buf_alloc); |
| return -ENOMEM; |
| } |
| memset(entry->buflist, 0, count * sizeof(*entry->buflist)); |
| |
| 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; |
| init_waitqueue_head(&buf->dma_wait); |
| buf->file_priv = NULL; |
| |
| buf->dev_priv_size = dev->driver->dev_priv_size; |
| buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS); |
| 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; |
| } |
| memset(buf->dev_private, 0, buf->dev_priv_size); |
| |
| 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 = drm_realloc(dma->buflist, |
| dma->buf_count * sizeof(*dma->buflist), |
| (dma->buf_count + entry->buf_count) |
| * sizeof(*dma->buflist), DRM_MEM_BUFS); |
| 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_FB; |
| |
| 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_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_HAVE_DMA)) |
| return -EINVAL; |
| |
| #if __OS_HAS_AGP |
| if (request->flags & _DRM_AGP_BUFFER) |
| ret = drm_addbufs_agp(dev, request); |
| else |
| #endif |
| if (request->flags & _DRM_SG_BUFFER) |
| ret = drm_addbufs_sg(dev, request); |
| else if (request->flags & _DRM_FB_BUFFER) |
| ret = drm_addbufs_fb(dev, request); |
| else |
| ret = drm_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::count_lock |
| * lock, preventing of allocating more buffers after this call. Information |
| * about each requested buffer is then copied into user space. |
| */ |
| int drm_infobufs(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_device_dma *dma = dev->dma; |
| struct drm_buf_info *request = data; |
| int i; |
| int count; |
| |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
| return -EINVAL; |
| |
| if (!dma) |
| return -EINVAL; |
| |
| spin_lock(&dev->count_lock); |
| if (atomic_read(&dev->buf_alloc)) { |
| spin_unlock(&dev->count_lock); |
| return -EBUSY; |
| } |
| ++dev->buf_use; /* Can't allocate more after this call */ |
| spin_unlock(&dev->count_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 (request->count >= count) { |
| for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { |
| if (dma->bufs[i].buf_count) { |
| struct drm_buf_desc __user *to = |
| &request->list[count]; |
| struct drm_buf_entry *from = &dma->bufs[i]; |
| struct drm_freelist *list = &dma->bufs[i].freelist; |
| if (copy_to_user(&to->count, |
| &from->buf_count, |
| sizeof(from->buf_count)) || |
| copy_to_user(&to->size, |
| &from->buf_size, |
| sizeof(from->buf_size)) || |
| copy_to_user(&to->low_mark, |
| &list->low_mark, |
| sizeof(list->low_mark)) || |
| copy_to_user(&to->high_mark, |
| &list->high_mark, |
| sizeof(list->high_mark))) |
| return -EFAULT; |
| |
| DRM_DEBUG("%d %d %d %d %d\n", |
| i, |
| dma->bufs[i].buf_count, |
| dma->bufs[i].buf_size, |
| dma->bufs[i].freelist.low_mark, |
| dma->bufs[i].freelist.high_mark); |
| ++count; |
| } |
| } |
| } |
| request->count = count; |
| |
| return 0; |
| } |
| |
| /** |
| * 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_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_HAVE_DMA)) |
| return -EINVAL; |
| |
| if (!dma) |
| return -EINVAL; |
| |
| DRM_DEBUG("%d, %d, %d\n", |
| request->size, request->low_mark, request->high_mark); |
| order = drm_order(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->freelist.low_mark = request->low_mark; |
| entry->freelist.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_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_HAVE_DMA)) |
| return -EINVAL; |
| |
| 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; |
| } |
| 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_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 do_mmap(), and copies information |
| * about each buffer into user space. For PCI buffers, it calls do_mmap() with |
| * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls |
| * drm_mmap_dma(). |
| */ |
| int drm_mapbufs(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_device_dma *dma = dev->dma; |
| int retcode = 0; |
| const int zero = 0; |
| unsigned long virtual; |
| unsigned long address; |
| struct drm_buf_map *request = data; |
| int i; |
| |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
| return -EINVAL; |
| |
| if (!dma) |
| return -EINVAL; |
| |
| spin_lock(&dev->count_lock); |
| if (atomic_read(&dev->buf_alloc)) { |
| spin_unlock(&dev->count_lock); |
| return -EBUSY; |
| } |
| dev->buf_use++; /* Can't allocate more after this call */ |
| spin_unlock(&dev->count_lock); |
| |
| if (request->count >= dma->buf_count) { |
| if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP)) |
| || (drm_core_check_feature(dev, DRIVER_SG) |
| && (dma->flags & _DRM_DMA_USE_SG)) |
| || (drm_core_check_feature(dev, DRIVER_FB_DMA) |
| && (dma->flags & _DRM_DMA_USE_FB))) { |
| struct drm_map *map = dev->agp_buffer_map; |
| unsigned long token = dev->agp_buffer_token; |
| |
| if (!map) { |
| retcode = -EINVAL; |
| goto done; |
| } |
| down_write(¤t->mm->mmap_sem); |
| virtual = do_mmap(file_priv->filp, 0, map->size, |
| PROT_READ | PROT_WRITE, |
| MAP_SHARED, |
| token); |
| up_write(¤t->mm->mmap_sem); |
| } else { |
| down_write(¤t->mm->mmap_sem); |
| virtual = do_mmap(file_priv->filp, 0, dma->byte_count, |
| PROT_READ | PROT_WRITE, |
| MAP_SHARED, 0); |
| up_write(¤t->mm->mmap_sem); |
| } |
| if (virtual > -1024UL) { |
| /* Real error */ |
| retcode = (signed long)virtual; |
| goto done; |
| } |
| request->virtual = (void __user *)virtual; |
| |
| for (i = 0; i < dma->buf_count; i++) { |
| if (copy_to_user(&request->list[i].idx, |
| &dma->buflist[i]->idx, |
| sizeof(request->list[0].idx))) { |
| retcode = -EFAULT; |
| goto done; |
| } |
| if (copy_to_user(&request->list[i].total, |
| &dma->buflist[i]->total, |
| sizeof(request->list[0].total))) { |
| retcode = -EFAULT; |
| goto done; |
| } |
| if (copy_to_user(&request->list[i].used, |
| &zero, sizeof(zero))) { |
| retcode = -EFAULT; |
| goto done; |
| } |
| address = virtual + dma->buflist[i]->offset; /* *** */ |
| if (copy_to_user(&request->list[i].address, |
| &address, sizeof(address))) { |
| retcode = -EFAULT; |
| goto done; |
| } |
| } |
| } |
| done: |
| request->count = dma->buf_count; |
| DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode); |
| |
| return retcode; |
| } |
| |
| /** |
| * Compute size order. Returns the exponent of the smaller power of two which |
| * is greater or equal to given number. |
| * |
| * \param size size. |
| * \return order. |
| * |
| * \todo Can be made faster. |
| */ |
| int drm_order(unsigned long size) |
| { |
| int order; |
| unsigned long tmp; |
| |
| for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ; |
| |
| if (size & (size - 1)) |
| ++order; |
| |
| return order; |
| } |
| EXPORT_SYMBOL(drm_order); |