| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds | 2368 | 31.87% | 8 | 6.90% |
| Linus Torvalds (pre-git) | 1611 | 21.68% | 2 | 1.72% |
| Dave Airlie | 1589 | 21.38% | 39 | 33.62% |
| Daniel Vetter | 604 | 8.13% | 15 | 12.93% |
| Al Viro | 351 | 4.72% | 4 | 3.45% |
| Eric Anholt | 196 | 2.64% | 4 | 3.45% |
| Thomas Hellstrom | 175 | 2.35% | 6 | 5.17% |
| Benjamin Herrenschmidt | 94 | 1.26% | 3 | 2.59% |
| David S. Miller | 83 | 1.12% | 1 | 0.86% |
| Jani Nikula | 50 | 0.67% | 1 | 0.86% |
| Chris Wilson | 45 | 0.61% | 2 | 1.72% |
| Andrew Lutomirski | 34 | 0.46% | 2 | 1.72% |
| Amol Lad | 28 | 0.38% | 1 | 0.86% |
| David Herrmann | 28 | 0.38% | 2 | 1.72% |
| Sam Ravnborg | 27 | 0.36% | 1 | 0.86% |
| Tormod Volden | 24 | 0.32% | 1 | 0.86% |
| Scott Thompson | 19 | 0.26% | 1 | 0.86% |
| George Sapountzis | 14 | 0.19% | 1 | 0.86% |
| Gustavo A. R. Silva | 13 | 0.17% | 1 | 0.86% |
| Ben Skeggs | 11 | 0.15% | 1 | 0.86% |
| Benjamin Gaignard | 10 | 0.13% | 1 | 0.86% |
| SF Markus Elfring | 10 | 0.13% | 4 | 3.45% |
| Dan Carpenter | 9 | 0.12% | 1 | 0.86% |
| Jordan Crouse | 6 | 0.08% | 1 | 0.86% |
| Dave Jones | 6 | 0.08% | 1 | 0.86% |
| Jesse Barnes | 5 | 0.07% | 2 | 1.72% |
| Davidlohr Bueso A | 4 | 0.05% | 1 | 0.86% |
| Christoph Hellwig | 4 | 0.05% | 1 | 0.86% |
| Tejun Heo | 3 | 0.04% | 1 | 0.86% |
| Pavel Emelyanov | 3 | 0.04% | 1 | 0.86% |
| Paul Gortmaker | 2 | 0.03% | 1 | 0.86% |
| Matt Roper | 1 | 0.01% | 1 | 0.86% |
| Thomas Weber | 1 | 0.01% | 1 | 0.86% |
| Pekka Paalanen | 1 | 0.01% | 1 | 0.86% |
| Andrew Morton | 1 | 0.01% | 1 | 0.86% |
| Adrian Bunk | 1 | 0.01% | 1 | 0.86% |
| Total | 7431 | 116 |
/* * 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);
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