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0001 /*
0002  * Legacy: Generic DRM Buffer Management
0003  *
0004  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
0005  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
0006  * All Rights Reserved.
0007  *
0008  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
0009  * Author: Gareth Hughes <gareth@valinux.com>
0010  *
0011  * Permission is hereby granted, free of charge, to any person obtaining a
0012  * copy of this software and associated documentation files (the "Software"),
0013  * to deal in the Software without restriction, including without limitation
0014  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0015  * and/or sell copies of the Software, and to permit persons to whom the
0016  * Software is furnished to do so, subject to the following conditions:
0017  *
0018  * The above copyright notice and this permission notice (including the next
0019  * paragraph) shall be included in all copies or substantial portions of the
0020  * Software.
0021  *
0022  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0023  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0024  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0025  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
0026  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0027  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0028  * OTHER DEALINGS IN THE SOFTWARE.
0029  */
0030 
0031 #include <linux/export.h>
0032 #include <linux/log2.h>
0033 #include <linux/mm.h>
0034 #include <linux/mman.h>
0035 #include <linux/nospec.h>
0036 #include <linux/pci.h>
0037 #include <linux/slab.h>
0038 #include <linux/uaccess.h>
0039 #include <linux/vmalloc.h>
0040 
0041 #include <asm/shmparam.h>
0042 
0043 #include <drm/drm_device.h>
0044 #include <drm/drm_drv.h>
0045 #include <drm/drm_file.h>
0046 #include <drm/drm_print.h>
0047 
0048 #include "drm_legacy.h"
0049 
0050 
0051 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
0052                           struct drm_local_map *map)
0053 {
0054     struct drm_map_list *entry;
0055 
0056     list_for_each_entry(entry, &dev->maplist, head) {
0057         /*
0058          * Because the kernel-userspace ABI is fixed at a 32-bit offset
0059          * while PCI resources may live above that, we only compare the
0060          * lower 32 bits of the map offset for maps of type
0061          * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
0062          * It is assumed that if a driver have more than one resource
0063          * of each type, the lower 32 bits are different.
0064          */
0065         if (!entry->map ||
0066             map->type != entry->map->type ||
0067             entry->master != dev->master)
0068             continue;
0069         switch (map->type) {
0070         case _DRM_SHM:
0071             if (map->flags != _DRM_CONTAINS_LOCK)
0072                 break;
0073             return entry;
0074         case _DRM_REGISTERS:
0075         case _DRM_FRAME_BUFFER:
0076             if ((entry->map->offset & 0xffffffff) ==
0077                 (map->offset & 0xffffffff))
0078                 return entry;
0079             break;
0080         default: /* Make gcc happy */
0081             break;
0082         }
0083         if (entry->map->offset == map->offset)
0084             return entry;
0085     }
0086 
0087     return NULL;
0088 }
0089 
0090 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
0091               unsigned long user_token, int hashed_handle, int shm)
0092 {
0093     int use_hashed_handle, shift;
0094     unsigned long add;
0095 
0096 #if (BITS_PER_LONG == 64)
0097     use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
0098 #elif (BITS_PER_LONG == 32)
0099     use_hashed_handle = hashed_handle;
0100 #else
0101 #error Unsupported long size. Neither 64 nor 32 bits.
0102 #endif
0103 
0104     if (!use_hashed_handle) {
0105         int ret;
0106 
0107         hash->key = user_token >> PAGE_SHIFT;
0108         ret = drm_ht_insert_item(&dev->map_hash, hash);
0109         if (ret != -EINVAL)
0110             return ret;
0111     }
0112 
0113     shift = 0;
0114     add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
0115     if (shm && (SHMLBA > PAGE_SIZE)) {
0116         int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
0117 
0118         /* For shared memory, we have to preserve the SHMLBA
0119          * bits of the eventual vma->vm_pgoff value during
0120          * mmap().  Otherwise we run into cache aliasing problems
0121          * on some platforms.  On these platforms, the pgoff of
0122          * a mmap() request is used to pick a suitable virtual
0123          * address for the mmap() region such that it will not
0124          * cause cache aliasing problems.
0125          *
0126          * Therefore, make sure the SHMLBA relevant bits of the
0127          * hash value we use are equal to those in the original
0128          * kernel virtual address.
0129          */
0130         shift = bits;
0131         add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
0132     }
0133 
0134     return drm_ht_just_insert_please(&dev->map_hash, hash,
0135                      user_token, 32 - PAGE_SHIFT - 3,
0136                      shift, add);
0137 }
0138 
0139 /*
0140  * Core function to create a range of memory available for mapping by a
0141  * non-root process.
0142  *
0143  * Adjusts the memory offset to its absolute value according to the mapping
0144  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
0145  * applicable and if supported by the kernel.
0146  */
0147 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
0148                unsigned int size, enum drm_map_type type,
0149                enum drm_map_flags flags,
0150                struct drm_map_list **maplist)
0151 {
0152     struct drm_local_map *map;
0153     struct drm_map_list *list;
0154     unsigned long user_token;
0155     int ret;
0156 
0157     map = kmalloc(sizeof(*map), GFP_KERNEL);
0158     if (!map)
0159         return -ENOMEM;
0160 
0161     map->offset = offset;
0162     map->size = size;
0163     map->flags = flags;
0164     map->type = type;
0165 
0166     /* Only allow shared memory to be removable since we only keep enough
0167      * book keeping information about shared memory to allow for removal
0168      * when processes fork.
0169      */
0170     if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
0171         kfree(map);
0172         return -EINVAL;
0173     }
0174     DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
0175           (unsigned long long)map->offset, map->size, map->type);
0176 
0177     /* page-align _DRM_SHM maps. They are allocated here so there is no security
0178      * hole created by that and it works around various broken drivers that use
0179      * a non-aligned quantity to map the SAREA. --BenH
0180      */
0181     if (map->type == _DRM_SHM)
0182         map->size = PAGE_ALIGN(map->size);
0183 
0184     if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
0185         kfree(map);
0186         return -EINVAL;
0187     }
0188     map->mtrr = -1;
0189     map->handle = NULL;
0190 
0191     switch (map->type) {
0192     case _DRM_REGISTERS:
0193     case _DRM_FRAME_BUFFER:
0194 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
0195         if (map->offset + (map->size-1) < map->offset ||
0196             map->offset < virt_to_phys(high_memory)) {
0197             kfree(map);
0198             return -EINVAL;
0199         }
0200 #endif
0201         /* Some drivers preinitialize some maps, without the X Server
0202          * needing to be aware of it.  Therefore, we just return success
0203          * when the server tries to create a duplicate map.
0204          */
0205         list = drm_find_matching_map(dev, map);
0206         if (list != NULL) {
0207             if (list->map->size != map->size) {
0208                 DRM_DEBUG("Matching maps of type %d with "
0209                       "mismatched sizes, (%ld vs %ld)\n",
0210                       map->type, map->size,
0211                       list->map->size);
0212                 list->map->size = map->size;
0213             }
0214 
0215             kfree(map);
0216             *maplist = list;
0217             return 0;
0218         }
0219 
0220         if (map->type == _DRM_FRAME_BUFFER ||
0221             (map->flags & _DRM_WRITE_COMBINING)) {
0222             map->mtrr =
0223                 arch_phys_wc_add(map->offset, map->size);
0224         }
0225         if (map->type == _DRM_REGISTERS) {
0226             if (map->flags & _DRM_WRITE_COMBINING)
0227                 map->handle = ioremap_wc(map->offset,
0228                              map->size);
0229             else
0230                 map->handle = ioremap(map->offset, map->size);
0231             if (!map->handle) {
0232                 kfree(map);
0233                 return -ENOMEM;
0234             }
0235         }
0236 
0237         break;
0238     case _DRM_SHM:
0239         list = drm_find_matching_map(dev, map);
0240         if (list != NULL) {
0241             if (list->map->size != map->size) {
0242                 DRM_DEBUG("Matching maps of type %d with "
0243                       "mismatched sizes, (%ld vs %ld)\n",
0244                       map->type, map->size, list->map->size);
0245                 list->map->size = map->size;
0246             }
0247 
0248             kfree(map);
0249             *maplist = list;
0250             return 0;
0251         }
0252         map->handle = vmalloc_user(map->size);
0253         DRM_DEBUG("%lu %d %p\n",
0254               map->size, order_base_2(map->size), map->handle);
0255         if (!map->handle) {
0256             kfree(map);
0257             return -ENOMEM;
0258         }
0259         map->offset = (unsigned long)map->handle;
0260         if (map->flags & _DRM_CONTAINS_LOCK) {
0261             /* Prevent a 2nd X Server from creating a 2nd lock */
0262             if (dev->master->lock.hw_lock != NULL) {
0263                 vfree(map->handle);
0264                 kfree(map);
0265                 return -EBUSY;
0266             }
0267             dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
0268         }
0269         break;
0270     case _DRM_AGP: {
0271         struct drm_agp_mem *entry;
0272         int valid = 0;
0273 
0274         if (!dev->agp) {
0275             kfree(map);
0276             return -EINVAL;
0277         }
0278 #ifdef __alpha__
0279         map->offset += dev->hose->mem_space->start;
0280 #endif
0281         /* In some cases (i810 driver), user space may have already
0282          * added the AGP base itself, because dev->agp->base previously
0283          * only got set during AGP enable.  So, only add the base
0284          * address if the map's offset isn't already within the
0285          * aperture.
0286          */
0287         if (map->offset < dev->agp->base ||
0288             map->offset > dev->agp->base +
0289             dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
0290             map->offset += dev->agp->base;
0291         }
0292         map->mtrr = dev->agp->agp_mtrr; /* for getmap */
0293 
0294         /* This assumes the DRM is in total control of AGP space.
0295          * It's not always the case as AGP can be in the control
0296          * of user space (i.e. i810 driver). So this loop will get
0297          * skipped and we double check that dev->agp->memory is
0298          * actually set as well as being invalid before EPERM'ing
0299          */
0300         list_for_each_entry(entry, &dev->agp->memory, head) {
0301             if ((map->offset >= entry->bound) &&
0302                 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
0303                 valid = 1;
0304                 break;
0305             }
0306         }
0307         if (!list_empty(&dev->agp->memory) && !valid) {
0308             kfree(map);
0309             return -EPERM;
0310         }
0311         DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
0312               (unsigned long long)map->offset, map->size);
0313 
0314         break;
0315     }
0316     case _DRM_SCATTER_GATHER:
0317         if (!dev->sg) {
0318             kfree(map);
0319             return -EINVAL;
0320         }
0321         map->offset += (unsigned long)dev->sg->virtual;
0322         break;
0323     case _DRM_CONSISTENT:
0324         /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
0325          * As we're limiting the address to 2^32-1 (or less),
0326          * casting it down to 32 bits is no problem, but we
0327          * need to point to a 64bit variable first.
0328          */
0329         map->handle = dma_alloc_coherent(dev->dev,
0330                          map->size,
0331                          &map->offset,
0332                          GFP_KERNEL);
0333         if (!map->handle) {
0334             kfree(map);
0335             return -ENOMEM;
0336         }
0337         break;
0338     default:
0339         kfree(map);
0340         return -EINVAL;
0341     }
0342 
0343     list = kzalloc(sizeof(*list), GFP_KERNEL);
0344     if (!list) {
0345         if (map->type == _DRM_REGISTERS)
0346             iounmap(map->handle);
0347         kfree(map);
0348         return -EINVAL;
0349     }
0350     list->map = map;
0351 
0352     mutex_lock(&dev->struct_mutex);
0353     list_add(&list->head, &dev->maplist);
0354 
0355     /* Assign a 32-bit handle */
0356     /* We do it here so that dev->struct_mutex protects the increment */
0357     user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
0358         map->offset;
0359     ret = drm_map_handle(dev, &list->hash, user_token, 0,
0360                  (map->type == _DRM_SHM));
0361     if (ret) {
0362         if (map->type == _DRM_REGISTERS)
0363             iounmap(map->handle);
0364         kfree(map);
0365         kfree(list);
0366         mutex_unlock(&dev->struct_mutex);
0367         return ret;
0368     }
0369 
0370     list->user_token = list->hash.key << PAGE_SHIFT;
0371     mutex_unlock(&dev->struct_mutex);
0372 
0373     if (!(map->flags & _DRM_DRIVER))
0374         list->master = dev->master;
0375     *maplist = list;
0376     return 0;
0377 }
0378 
0379 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
0380               unsigned int size, enum drm_map_type type,
0381               enum drm_map_flags flags, struct drm_local_map **map_ptr)
0382 {
0383     struct drm_map_list *list;
0384     int rc;
0385 
0386     rc = drm_addmap_core(dev, offset, size, type, flags, &list);
0387     if (!rc)
0388         *map_ptr = list->map;
0389     return rc;
0390 }
0391 EXPORT_SYMBOL(drm_legacy_addmap);
0392 
0393 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
0394                      unsigned int token)
0395 {
0396     struct drm_map_list *_entry;
0397 
0398     list_for_each_entry(_entry, &dev->maplist, head)
0399         if (_entry->user_token == token)
0400             return _entry->map;
0401     return NULL;
0402 }
0403 EXPORT_SYMBOL(drm_legacy_findmap);
0404 
0405 /*
0406  * Ioctl to specify a range of memory that is available for mapping by a
0407  * non-root process.
0408  *
0409  * \param inode device inode.
0410  * \param file_priv DRM file private.
0411  * \param cmd command.
0412  * \param arg pointer to a drm_map structure.
0413  * \return zero on success or a negative value on error.
0414  *
0415  */
0416 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
0417                 struct drm_file *file_priv)
0418 {
0419     struct drm_map *map = data;
0420     struct drm_map_list *maplist;
0421     int err;
0422 
0423     if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
0424         return -EPERM;
0425 
0426     if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
0427         !drm_core_check_feature(dev, DRIVER_LEGACY))
0428         return -EOPNOTSUPP;
0429 
0430     err = drm_addmap_core(dev, map->offset, map->size, map->type,
0431                   map->flags, &maplist);
0432 
0433     if (err)
0434         return err;
0435 
0436     /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
0437     map->handle = (void *)(unsigned long)maplist->user_token;
0438 
0439     /*
0440      * It appears that there are no users of this value whatsoever --
0441      * drmAddMap just discards it.  Let's not encourage its use.
0442      * (Keeping drm_addmap_core's returned mtrr value would be wrong --
0443      *  it's not a real mtrr index anymore.)
0444      */
0445     map->mtrr = -1;
0446 
0447     return 0;
0448 }
0449 
0450 /*
0451  * Get a mapping information.
0452  *
0453  * \param inode device inode.
0454  * \param file_priv DRM file private.
0455  * \param cmd command.
0456  * \param arg user argument, pointing to a drm_map structure.
0457  *
0458  * \return zero on success or a negative number on failure.
0459  *
0460  * Searches for the mapping with the specified offset and copies its information
0461  * into userspace
0462  */
0463 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
0464                 struct drm_file *file_priv)
0465 {
0466     struct drm_map *map = data;
0467     struct drm_map_list *r_list = NULL;
0468     struct list_head *list;
0469     int idx;
0470     int i;
0471 
0472     if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
0473         !drm_core_check_feature(dev, DRIVER_LEGACY))
0474         return -EOPNOTSUPP;
0475 
0476     idx = map->offset;
0477     if (idx < 0)
0478         return -EINVAL;
0479 
0480     i = 0;
0481     mutex_lock(&dev->struct_mutex);
0482     list_for_each(list, &dev->maplist) {
0483         if (i == idx) {
0484             r_list = list_entry(list, struct drm_map_list, head);
0485             break;
0486         }
0487         i++;
0488     }
0489     if (!r_list || !r_list->map) {
0490         mutex_unlock(&dev->struct_mutex);
0491         return -EINVAL;
0492     }
0493 
0494     map->offset = r_list->map->offset;
0495     map->size = r_list->map->size;
0496     map->type = r_list->map->type;
0497     map->flags = r_list->map->flags;
0498     map->handle = (void *)(unsigned long) r_list->user_token;
0499     map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
0500 
0501     mutex_unlock(&dev->struct_mutex);
0502 
0503     return 0;
0504 }
0505 
0506 /*
0507  * Remove a map private from list and deallocate resources if the mapping
0508  * isn't in use.
0509  *
0510  * Searches the map on drm_device::maplist, removes it from the list, see if
0511  * it's being used, and free any associated resource (such as MTRR's) if it's not
0512  * being on use.
0513  *
0514  * \sa drm_legacy_addmap
0515  */
0516 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
0517 {
0518     struct drm_map_list *r_list = NULL, *list_t;
0519     int found = 0;
0520     struct drm_master *master;
0521 
0522     /* Find the list entry for the map and remove it */
0523     list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
0524         if (r_list->map == map) {
0525             master = r_list->master;
0526             list_del(&r_list->head);
0527             drm_ht_remove_key(&dev->map_hash,
0528                       r_list->user_token >> PAGE_SHIFT);
0529             kfree(r_list);
0530             found = 1;
0531             break;
0532         }
0533     }
0534 
0535     if (!found)
0536         return -EINVAL;
0537 
0538     switch (map->type) {
0539     case _DRM_REGISTERS:
0540         iounmap(map->handle);
0541         fallthrough;
0542     case _DRM_FRAME_BUFFER:
0543         arch_phys_wc_del(map->mtrr);
0544         break;
0545     case _DRM_SHM:
0546         vfree(map->handle);
0547         if (master) {
0548             if (dev->sigdata.lock == master->lock.hw_lock)
0549                 dev->sigdata.lock = NULL;
0550             master->lock.hw_lock = NULL;   /* SHM removed */
0551             master->lock.file_priv = NULL;
0552             wake_up_interruptible_all(&master->lock.lock_queue);
0553         }
0554         break;
0555     case _DRM_AGP:
0556     case _DRM_SCATTER_GATHER:
0557         break;
0558     case _DRM_CONSISTENT:
0559         dma_free_coherent(dev->dev,
0560                   map->size,
0561                   map->handle,
0562                   map->offset);
0563         break;
0564     }
0565     kfree(map);
0566 
0567     return 0;
0568 }
0569 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
0570 
0571 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
0572 {
0573     if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
0574         !drm_core_check_feature(dev, DRIVER_LEGACY))
0575         return;
0576 
0577     mutex_lock(&dev->struct_mutex);
0578     drm_legacy_rmmap_locked(dev, map);
0579     mutex_unlock(&dev->struct_mutex);
0580 }
0581 EXPORT_SYMBOL(drm_legacy_rmmap);
0582 
0583 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
0584 {
0585     struct drm_map_list *r_list, *list_temp;
0586 
0587     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
0588         return;
0589 
0590     mutex_lock(&dev->struct_mutex);
0591     list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
0592         if (r_list->master == master) {
0593             drm_legacy_rmmap_locked(dev, r_list->map);
0594             r_list = NULL;
0595         }
0596     }
0597     mutex_unlock(&dev->struct_mutex);
0598 }
0599 
0600 void drm_legacy_rmmaps(struct drm_device *dev)
0601 {
0602     struct drm_map_list *r_list, *list_temp;
0603 
0604     list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
0605         drm_legacy_rmmap(dev, r_list->map);
0606 }
0607 
0608 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
0609  * the last close of the device, and this is necessary for cleanup when things
0610  * exit uncleanly.  Therefore, having userland manually remove mappings seems
0611  * like a pointless exercise since they're going away anyway.
0612  *
0613  * One use case might be after addmap is allowed for normal users for SHM and
0614  * gets used by drivers that the server doesn't need to care about.  This seems
0615  * unlikely.
0616  *
0617  * \param inode device inode.
0618  * \param file_priv DRM file private.
0619  * \param cmd command.
0620  * \param arg pointer to a struct drm_map structure.
0621  * \return zero on success or a negative value on error.
0622  */
0623 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
0624                struct drm_file *file_priv)
0625 {
0626     struct drm_map *request = data;
0627     struct drm_local_map *map = NULL;
0628     struct drm_map_list *r_list;
0629     int ret;
0630 
0631     if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
0632         !drm_core_check_feature(dev, DRIVER_LEGACY))
0633         return -EOPNOTSUPP;
0634 
0635     mutex_lock(&dev->struct_mutex);
0636     list_for_each_entry(r_list, &dev->maplist, head) {
0637         if (r_list->map &&
0638             r_list->user_token == (unsigned long)request->handle &&
0639             r_list->map->flags & _DRM_REMOVABLE) {
0640             map = r_list->map;
0641             break;
0642         }
0643     }
0644 
0645     /* List has wrapped around to the head pointer, or it's empty we didn't
0646      * find anything.
0647      */
0648     if (list_empty(&dev->maplist) || !map) {
0649         mutex_unlock(&dev->struct_mutex);
0650         return -EINVAL;
0651     }
0652 
0653     /* Register and framebuffer maps are permanent */
0654     if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
0655         mutex_unlock(&dev->struct_mutex);
0656         return 0;
0657     }
0658 
0659     ret = drm_legacy_rmmap_locked(dev, map);
0660 
0661     mutex_unlock(&dev->struct_mutex);
0662 
0663     return ret;
0664 }
0665 
0666 /*
0667  * Cleanup after an error on one of the addbufs() functions.
0668  *
0669  * \param dev DRM device.
0670  * \param entry buffer entry where the error occurred.
0671  *
0672  * Frees any pages and buffers associated with the given entry.
0673  */
0674 static void drm_cleanup_buf_error(struct drm_device *dev,
0675                   struct drm_buf_entry *entry)
0676 {
0677     drm_dma_handle_t *dmah;
0678     int i;
0679 
0680     if (entry->seg_count) {
0681         for (i = 0; i < entry->seg_count; i++) {
0682             if (entry->seglist[i]) {
0683                 dmah = entry->seglist[i];
0684                 dma_free_coherent(dev->dev,
0685                           dmah->size,
0686                           dmah->vaddr,
0687                           dmah->busaddr);
0688                 kfree(dmah);
0689             }
0690         }
0691         kfree(entry->seglist);
0692 
0693         entry->seg_count = 0;
0694     }
0695 
0696     if (entry->buf_count) {
0697         for (i = 0; i < entry->buf_count; i++) {
0698             kfree(entry->buflist[i].dev_private);
0699         }
0700         kfree(entry->buflist);
0701 
0702         entry->buf_count = 0;
0703     }
0704 }
0705 
0706 #if IS_ENABLED(CONFIG_AGP)
0707 /*
0708  * Add AGP buffers for DMA transfers.
0709  *
0710  * \param dev struct drm_device to which the buffers are to be added.
0711  * \param request pointer to a struct drm_buf_desc describing the request.
0712  * \return zero on success or a negative number on failure.
0713  *
0714  * After some sanity checks creates a drm_buf structure for each buffer and
0715  * reallocates the buffer list of the same size order to accommodate the new
0716  * buffers.
0717  */
0718 int drm_legacy_addbufs_agp(struct drm_device *dev,
0719                struct drm_buf_desc *request)
0720 {
0721     struct drm_device_dma *dma = dev->dma;
0722     struct drm_buf_entry *entry;
0723     struct drm_agp_mem *agp_entry;
0724     struct drm_buf *buf;
0725     unsigned long offset;
0726     unsigned long agp_offset;
0727     int count;
0728     int order;
0729     int size;
0730     int alignment;
0731     int page_order;
0732     int total;
0733     int byte_count;
0734     int i, valid;
0735     struct drm_buf **temp_buflist;
0736 
0737     if (!dma)
0738         return -EINVAL;
0739 
0740     count = request->count;
0741     order = order_base_2(request->size);
0742     size = 1 << order;
0743 
0744     alignment = (request->flags & _DRM_PAGE_ALIGN)
0745         ? PAGE_ALIGN(size) : size;
0746     page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
0747     total = PAGE_SIZE << page_order;
0748 
0749     byte_count = 0;
0750     agp_offset = dev->agp->base + request->agp_start;
0751 
0752     DRM_DEBUG("count:      %d\n", count);
0753     DRM_DEBUG("order:      %d\n", order);
0754     DRM_DEBUG("size:       %d\n", size);
0755     DRM_DEBUG("agp_offset: %lx\n", agp_offset);
0756     DRM_DEBUG("alignment:  %d\n", alignment);
0757     DRM_DEBUG("page_order: %d\n", page_order);
0758     DRM_DEBUG("total:      %d\n", total);
0759 
0760     if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
0761         return -EINVAL;
0762 
0763     /* Make sure buffers are located in AGP memory that we own */
0764     valid = 0;
0765     list_for_each_entry(agp_entry, &dev->agp->memory, head) {
0766         if ((agp_offset >= agp_entry->bound) &&
0767             (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
0768             valid = 1;
0769             break;
0770         }
0771     }
0772     if (!list_empty(&dev->agp->memory) && !valid) {
0773         DRM_DEBUG("zone invalid\n");
0774         return -EINVAL;
0775     }
0776     spin_lock(&dev->buf_lock);
0777     if (dev->buf_use) {
0778         spin_unlock(&dev->buf_lock);
0779         return -EBUSY;
0780     }
0781     atomic_inc(&dev->buf_alloc);
0782     spin_unlock(&dev->buf_lock);
0783 
0784     mutex_lock(&dev->struct_mutex);
0785     entry = &dma->bufs[order];
0786     if (entry->buf_count) {
0787         mutex_unlock(&dev->struct_mutex);
0788         atomic_dec(&dev->buf_alloc);
0789         return -ENOMEM; /* May only call once for each order */
0790     }
0791 
0792     if (count < 0 || count > 4096) {
0793         mutex_unlock(&dev->struct_mutex);
0794         atomic_dec(&dev->buf_alloc);
0795         return -EINVAL;
0796     }
0797 
0798     entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
0799     if (!entry->buflist) {
0800         mutex_unlock(&dev->struct_mutex);
0801         atomic_dec(&dev->buf_alloc);
0802         return -ENOMEM;
0803     }
0804 
0805     entry->buf_size = size;
0806     entry->page_order = page_order;
0807 
0808     offset = 0;
0809 
0810     while (entry->buf_count < count) {
0811         buf = &entry->buflist[entry->buf_count];
0812         buf->idx = dma->buf_count + entry->buf_count;
0813         buf->total = alignment;
0814         buf->order = order;
0815         buf->used = 0;
0816 
0817         buf->offset = (dma->byte_count + offset);
0818         buf->bus_address = agp_offset + offset;
0819         buf->address = (void *)(agp_offset + offset);
0820         buf->next = NULL;
0821         buf->waiting = 0;
0822         buf->pending = 0;
0823         buf->file_priv = NULL;
0824 
0825         buf->dev_priv_size = dev->driver->dev_priv_size;
0826         buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
0827         if (!buf->dev_private) {
0828             /* Set count correctly so we free the proper amount. */
0829             entry->buf_count = count;
0830             drm_cleanup_buf_error(dev, entry);
0831             mutex_unlock(&dev->struct_mutex);
0832             atomic_dec(&dev->buf_alloc);
0833             return -ENOMEM;
0834         }
0835 
0836         DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
0837 
0838         offset += alignment;
0839         entry->buf_count++;
0840         byte_count += PAGE_SIZE << page_order;
0841     }
0842 
0843     DRM_DEBUG("byte_count: %d\n", byte_count);
0844 
0845     temp_buflist = krealloc(dma->buflist,
0846                 (dma->buf_count + entry->buf_count) *
0847                 sizeof(*dma->buflist), GFP_KERNEL);
0848     if (!temp_buflist) {
0849         /* Free the entry because it isn't valid */
0850         drm_cleanup_buf_error(dev, entry);
0851         mutex_unlock(&dev->struct_mutex);
0852         atomic_dec(&dev->buf_alloc);
0853         return -ENOMEM;
0854     }
0855     dma->buflist = temp_buflist;
0856 
0857     for (i = 0; i < entry->buf_count; i++) {
0858         dma->buflist[i + dma->buf_count] = &entry->buflist[i];
0859     }
0860 
0861     dma->buf_count += entry->buf_count;
0862     dma->seg_count += entry->seg_count;
0863     dma->page_count += byte_count >> PAGE_SHIFT;
0864     dma->byte_count += byte_count;
0865 
0866     DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
0867     DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
0868 
0869     mutex_unlock(&dev->struct_mutex);
0870 
0871     request->count = entry->buf_count;
0872     request->size = size;
0873 
0874     dma->flags = _DRM_DMA_USE_AGP;
0875 
0876     atomic_dec(&dev->buf_alloc);
0877     return 0;
0878 }
0879 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
0880 #endif /* CONFIG_AGP */
0881 
0882 int drm_legacy_addbufs_pci(struct drm_device *dev,
0883                struct drm_buf_desc *request)
0884 {
0885     struct drm_device_dma *dma = dev->dma;
0886     int count;
0887     int order;
0888     int size;
0889     int total;
0890     int page_order;
0891     struct drm_buf_entry *entry;
0892     drm_dma_handle_t *dmah;
0893     struct drm_buf *buf;
0894     int alignment;
0895     unsigned long offset;
0896     int i;
0897     int byte_count;
0898     int page_count;
0899     unsigned long *temp_pagelist;
0900     struct drm_buf **temp_buflist;
0901 
0902     if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
0903         return -EOPNOTSUPP;
0904 
0905     if (!dma)
0906         return -EINVAL;
0907 
0908     if (!capable(CAP_SYS_ADMIN))
0909         return -EPERM;
0910 
0911     count = request->count;
0912     order = order_base_2(request->size);
0913     size = 1 << order;
0914 
0915     DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
0916           request->count, request->size, size, order);
0917 
0918     if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
0919         return -EINVAL;
0920 
0921     alignment = (request->flags & _DRM_PAGE_ALIGN)
0922         ? PAGE_ALIGN(size) : size;
0923     page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
0924     total = PAGE_SIZE << page_order;
0925 
0926     spin_lock(&dev->buf_lock);
0927     if (dev->buf_use) {
0928         spin_unlock(&dev->buf_lock);
0929         return -EBUSY;
0930     }
0931     atomic_inc(&dev->buf_alloc);
0932     spin_unlock(&dev->buf_lock);
0933 
0934     mutex_lock(&dev->struct_mutex);
0935     entry = &dma->bufs[order];
0936     if (entry->buf_count) {
0937         mutex_unlock(&dev->struct_mutex);
0938         atomic_dec(&dev->buf_alloc);
0939         return -ENOMEM; /* May only call once for each order */
0940     }
0941 
0942     if (count < 0 || count > 4096) {
0943         mutex_unlock(&dev->struct_mutex);
0944         atomic_dec(&dev->buf_alloc);
0945         return -EINVAL;
0946     }
0947 
0948     entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
0949     if (!entry->buflist) {
0950         mutex_unlock(&dev->struct_mutex);
0951         atomic_dec(&dev->buf_alloc);
0952         return -ENOMEM;
0953     }
0954 
0955     entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
0956     if (!entry->seglist) {
0957         kfree(entry->buflist);
0958         mutex_unlock(&dev->struct_mutex);
0959         atomic_dec(&dev->buf_alloc);
0960         return -ENOMEM;
0961     }
0962 
0963     /* Keep the original pagelist until we know all the allocations
0964      * have succeeded
0965      */
0966     temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
0967                       sizeof(*dma->pagelist),
0968                       GFP_KERNEL);
0969     if (!temp_pagelist) {
0970         kfree(entry->buflist);
0971         kfree(entry->seglist);
0972         mutex_unlock(&dev->struct_mutex);
0973         atomic_dec(&dev->buf_alloc);
0974         return -ENOMEM;
0975     }
0976     memcpy(temp_pagelist,
0977            dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
0978     DRM_DEBUG("pagelist: %d entries\n",
0979           dma->page_count + (count << page_order));
0980 
0981     entry->buf_size = size;
0982     entry->page_order = page_order;
0983     byte_count = 0;
0984     page_count = 0;
0985 
0986     while (entry->buf_count < count) {
0987         dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
0988         if (!dmah) {
0989             /* Set count correctly so we free the proper amount. */
0990             entry->buf_count = count;
0991             entry->seg_count = count;
0992             drm_cleanup_buf_error(dev, entry);
0993             kfree(temp_pagelist);
0994             mutex_unlock(&dev->struct_mutex);
0995             atomic_dec(&dev->buf_alloc);
0996             return -ENOMEM;
0997         }
0998 
0999         dmah->size = total;
1000         dmah->vaddr = dma_alloc_coherent(dev->dev,
1001                          dmah->size,
1002                          &dmah->busaddr,
1003                          GFP_KERNEL);
1004         if (!dmah->vaddr) {
1005             kfree(dmah);
1006 
1007             /* Set count correctly so we free the proper amount. */
1008             entry->buf_count = count;
1009             entry->seg_count = count;
1010             drm_cleanup_buf_error(dev, entry);
1011             kfree(temp_pagelist);
1012             mutex_unlock(&dev->struct_mutex);
1013             atomic_dec(&dev->buf_alloc);
1014             return -ENOMEM;
1015         }
1016         entry->seglist[entry->seg_count++] = dmah;
1017         for (i = 0; i < (1 << page_order); i++) {
1018             DRM_DEBUG("page %d @ 0x%08lx\n",
1019                   dma->page_count + page_count,
1020                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
1021             temp_pagelist[dma->page_count + page_count++]
1022                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1023         }
1024         for (offset = 0;
1025              offset + size <= total && entry->buf_count < count;
1026              offset += alignment, ++entry->buf_count) {
1027             buf = &entry->buflist[entry->buf_count];
1028             buf->idx = dma->buf_count + entry->buf_count;
1029             buf->total = alignment;
1030             buf->order = order;
1031             buf->used = 0;
1032             buf->offset = (dma->byte_count + byte_count + offset);
1033             buf->address = (void *)(dmah->vaddr + offset);
1034             buf->bus_address = dmah->busaddr + offset;
1035             buf->next = NULL;
1036             buf->waiting = 0;
1037             buf->pending = 0;
1038             buf->file_priv = NULL;
1039 
1040             buf->dev_priv_size = dev->driver->dev_priv_size;
1041             buf->dev_private = kzalloc(buf->dev_priv_size,
1042                         GFP_KERNEL);
1043             if (!buf->dev_private) {
1044                 /* Set count correctly so we free the proper amount. */
1045                 entry->buf_count = count;
1046                 entry->seg_count = count;
1047                 drm_cleanup_buf_error(dev, entry);
1048                 kfree(temp_pagelist);
1049                 mutex_unlock(&dev->struct_mutex);
1050                 atomic_dec(&dev->buf_alloc);
1051                 return -ENOMEM;
1052             }
1053 
1054             DRM_DEBUG("buffer %d @ %p\n",
1055                   entry->buf_count, buf->address);
1056         }
1057         byte_count += PAGE_SIZE << page_order;
1058     }
1059 
1060     temp_buflist = krealloc(dma->buflist,
1061                 (dma->buf_count + entry->buf_count) *
1062                 sizeof(*dma->buflist), GFP_KERNEL);
1063     if (!temp_buflist) {
1064         /* Free the entry because it isn't valid */
1065         drm_cleanup_buf_error(dev, entry);
1066         kfree(temp_pagelist);
1067         mutex_unlock(&dev->struct_mutex);
1068         atomic_dec(&dev->buf_alloc);
1069         return -ENOMEM;
1070     }
1071     dma->buflist = temp_buflist;
1072 
1073     for (i = 0; i < entry->buf_count; i++) {
1074         dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1075     }
1076 
1077     /* No allocations failed, so now we can replace the original pagelist
1078      * with the new one.
1079      */
1080     if (dma->page_count) {
1081         kfree(dma->pagelist);
1082     }
1083     dma->pagelist = temp_pagelist;
1084 
1085     dma->buf_count += entry->buf_count;
1086     dma->seg_count += entry->seg_count;
1087     dma->page_count += entry->seg_count << page_order;
1088     dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1089 
1090     mutex_unlock(&dev->struct_mutex);
1091 
1092     request->count = entry->buf_count;
1093     request->size = size;
1094 
1095     if (request->flags & _DRM_PCI_BUFFER_RO)
1096         dma->flags = _DRM_DMA_USE_PCI_RO;
1097 
1098     atomic_dec(&dev->buf_alloc);
1099     return 0;
1100 
1101 }
1102 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1103 
1104 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1105                  struct drm_buf_desc *request)
1106 {
1107     struct drm_device_dma *dma = dev->dma;
1108     struct drm_buf_entry *entry;
1109     struct drm_buf *buf;
1110     unsigned long offset;
1111     unsigned long agp_offset;
1112     int count;
1113     int order;
1114     int size;
1115     int alignment;
1116     int page_order;
1117     int total;
1118     int byte_count;
1119     int i;
1120     struct drm_buf **temp_buflist;
1121 
1122     if (!drm_core_check_feature(dev, DRIVER_SG))
1123         return -EOPNOTSUPP;
1124 
1125     if (!dma)
1126         return -EINVAL;
1127 
1128     if (!capable(CAP_SYS_ADMIN))
1129         return -EPERM;
1130 
1131     count = request->count;
1132     order = order_base_2(request->size);
1133     size = 1 << order;
1134 
1135     alignment = (request->flags & _DRM_PAGE_ALIGN)
1136         ? PAGE_ALIGN(size) : size;
1137     page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1138     total = PAGE_SIZE << page_order;
1139 
1140     byte_count = 0;
1141     agp_offset = request->agp_start;
1142 
1143     DRM_DEBUG("count:      %d\n", count);
1144     DRM_DEBUG("order:      %d\n", order);
1145     DRM_DEBUG("size:       %d\n", size);
1146     DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1147     DRM_DEBUG("alignment:  %d\n", alignment);
1148     DRM_DEBUG("page_order: %d\n", page_order);
1149     DRM_DEBUG("total:      %d\n", total);
1150 
1151     if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1152         return -EINVAL;
1153 
1154     spin_lock(&dev->buf_lock);
1155     if (dev->buf_use) {
1156         spin_unlock(&dev->buf_lock);
1157         return -EBUSY;
1158     }
1159     atomic_inc(&dev->buf_alloc);
1160     spin_unlock(&dev->buf_lock);
1161 
1162     mutex_lock(&dev->struct_mutex);
1163     entry = &dma->bufs[order];
1164     if (entry->buf_count) {
1165         mutex_unlock(&dev->struct_mutex);
1166         atomic_dec(&dev->buf_alloc);
1167         return -ENOMEM; /* May only call once for each order */
1168     }
1169 
1170     if (count < 0 || count > 4096) {
1171         mutex_unlock(&dev->struct_mutex);
1172         atomic_dec(&dev->buf_alloc);
1173         return -EINVAL;
1174     }
1175 
1176     entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1177     if (!entry->buflist) {
1178         mutex_unlock(&dev->struct_mutex);
1179         atomic_dec(&dev->buf_alloc);
1180         return -ENOMEM;
1181     }
1182 
1183     entry->buf_size = size;
1184     entry->page_order = page_order;
1185 
1186     offset = 0;
1187 
1188     while (entry->buf_count < count) {
1189         buf = &entry->buflist[entry->buf_count];
1190         buf->idx = dma->buf_count + entry->buf_count;
1191         buf->total = alignment;
1192         buf->order = order;
1193         buf->used = 0;
1194 
1195         buf->offset = (dma->byte_count + offset);
1196         buf->bus_address = agp_offset + offset;
1197         buf->address = (void *)(agp_offset + offset
1198                     + (unsigned long)dev->sg->virtual);
1199         buf->next = NULL;
1200         buf->waiting = 0;
1201         buf->pending = 0;
1202         buf->file_priv = NULL;
1203 
1204         buf->dev_priv_size = dev->driver->dev_priv_size;
1205         buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1206         if (!buf->dev_private) {
1207             /* Set count correctly so we free the proper amount. */
1208             entry->buf_count = count;
1209             drm_cleanup_buf_error(dev, entry);
1210             mutex_unlock(&dev->struct_mutex);
1211             atomic_dec(&dev->buf_alloc);
1212             return -ENOMEM;
1213         }
1214 
1215         DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1216 
1217         offset += alignment;
1218         entry->buf_count++;
1219         byte_count += PAGE_SIZE << page_order;
1220     }
1221 
1222     DRM_DEBUG("byte_count: %d\n", byte_count);
1223 
1224     temp_buflist = krealloc(dma->buflist,
1225                 (dma->buf_count + entry->buf_count) *
1226                 sizeof(*dma->buflist), GFP_KERNEL);
1227     if (!temp_buflist) {
1228         /* Free the entry because it isn't valid */
1229         drm_cleanup_buf_error(dev, entry);
1230         mutex_unlock(&dev->struct_mutex);
1231         atomic_dec(&dev->buf_alloc);
1232         return -ENOMEM;
1233     }
1234     dma->buflist = temp_buflist;
1235 
1236     for (i = 0; i < entry->buf_count; i++) {
1237         dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1238     }
1239 
1240     dma->buf_count += entry->buf_count;
1241     dma->seg_count += entry->seg_count;
1242     dma->page_count += byte_count >> PAGE_SHIFT;
1243     dma->byte_count += byte_count;
1244 
1245     DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1246     DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1247 
1248     mutex_unlock(&dev->struct_mutex);
1249 
1250     request->count = entry->buf_count;
1251     request->size = size;
1252 
1253     dma->flags = _DRM_DMA_USE_SG;
1254 
1255     atomic_dec(&dev->buf_alloc);
1256     return 0;
1257 }
1258 
1259 /*
1260  * Add buffers for DMA transfers (ioctl).
1261  *
1262  * \param inode device inode.
1263  * \param file_priv DRM file private.
1264  * \param cmd command.
1265  * \param arg pointer to a struct drm_buf_desc request.
1266  * \return zero on success or a negative number on failure.
1267  *
1268  * According with the memory type specified in drm_buf_desc::flags and the
1269  * build options, it dispatches the call either to addbufs_agp(),
1270  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1271  * PCI memory respectively.
1272  */
1273 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1274                struct drm_file *file_priv)
1275 {
1276     struct drm_buf_desc *request = data;
1277     int ret;
1278 
1279     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1280         return -EOPNOTSUPP;
1281 
1282     if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1283         return -EOPNOTSUPP;
1284 
1285 #if IS_ENABLED(CONFIG_AGP)
1286     if (request->flags & _DRM_AGP_BUFFER)
1287         ret = drm_legacy_addbufs_agp(dev, request);
1288     else
1289 #endif
1290     if (request->flags & _DRM_SG_BUFFER)
1291         ret = drm_legacy_addbufs_sg(dev, request);
1292     else if (request->flags & _DRM_FB_BUFFER)
1293         ret = -EINVAL;
1294     else
1295         ret = drm_legacy_addbufs_pci(dev, request);
1296 
1297     return ret;
1298 }
1299 
1300 /*
1301  * Get information about the buffer mappings.
1302  *
1303  * This was originally mean for debugging purposes, or by a sophisticated
1304  * client library to determine how best to use the available buffers (e.g.,
1305  * large buffers can be used for image transfer).
1306  *
1307  * \param inode device inode.
1308  * \param file_priv DRM file private.
1309  * \param cmd command.
1310  * \param arg pointer to a drm_buf_info structure.
1311  * \return zero on success or a negative number on failure.
1312  *
1313  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1314  * lock, preventing of allocating more buffers after this call. Information
1315  * about each requested buffer is then copied into user space.
1316  */
1317 int __drm_legacy_infobufs(struct drm_device *dev,
1318             void *data, int *p,
1319             int (*f)(void *, int, struct drm_buf_entry *))
1320 {
1321     struct drm_device_dma *dma = dev->dma;
1322     int i;
1323     int count;
1324 
1325     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1326         return -EOPNOTSUPP;
1327 
1328     if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1329         return -EOPNOTSUPP;
1330 
1331     if (!dma)
1332         return -EINVAL;
1333 
1334     spin_lock(&dev->buf_lock);
1335     if (atomic_read(&dev->buf_alloc)) {
1336         spin_unlock(&dev->buf_lock);
1337         return -EBUSY;
1338     }
1339     ++dev->buf_use;     /* Can't allocate more after this call */
1340     spin_unlock(&dev->buf_lock);
1341 
1342     for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1343         if (dma->bufs[i].buf_count)
1344             ++count;
1345     }
1346 
1347     DRM_DEBUG("count = %d\n", count);
1348 
1349     if (*p >= count) {
1350         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1351             struct drm_buf_entry *from = &dma->bufs[i];
1352 
1353             if (from->buf_count) {
1354                 if (f(data, count, from) < 0)
1355                     return -EFAULT;
1356                 DRM_DEBUG("%d %d %d %d %d\n",
1357                       i,
1358                       dma->bufs[i].buf_count,
1359                       dma->bufs[i].buf_size,
1360                       dma->bufs[i].low_mark,
1361                       dma->bufs[i].high_mark);
1362                 ++count;
1363             }
1364         }
1365     }
1366     *p = count;
1367 
1368     return 0;
1369 }
1370 
1371 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1372 {
1373     struct drm_buf_info *request = data;
1374     struct drm_buf_desc __user *to = &request->list[count];
1375     struct drm_buf_desc v = {.count = from->buf_count,
1376                  .size = from->buf_size,
1377                  .low_mark = from->low_mark,
1378                  .high_mark = from->high_mark};
1379 
1380     if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1381         return -EFAULT;
1382     return 0;
1383 }
1384 
1385 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1386             struct drm_file *file_priv)
1387 {
1388     struct drm_buf_info *request = data;
1389 
1390     return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1391 }
1392 
1393 /*
1394  * Specifies a low and high water mark for buffer allocation
1395  *
1396  * \param inode device inode.
1397  * \param file_priv DRM file private.
1398  * \param cmd command.
1399  * \param arg a pointer to a drm_buf_desc structure.
1400  * \return zero on success or a negative number on failure.
1401  *
1402  * Verifies that the size order is bounded between the admissible orders and
1403  * updates the respective drm_device_dma::bufs entry low and high water mark.
1404  *
1405  * \note This ioctl is deprecated and mostly never used.
1406  */
1407 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1408             struct drm_file *file_priv)
1409 {
1410     struct drm_device_dma *dma = dev->dma;
1411     struct drm_buf_desc *request = data;
1412     int order;
1413     struct drm_buf_entry *entry;
1414 
1415     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1416         return -EOPNOTSUPP;
1417 
1418     if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1419         return -EOPNOTSUPP;
1420 
1421     if (!dma)
1422         return -EINVAL;
1423 
1424     DRM_DEBUG("%d, %d, %d\n",
1425           request->size, request->low_mark, request->high_mark);
1426     order = order_base_2(request->size);
1427     if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1428         return -EINVAL;
1429     entry = &dma->bufs[order];
1430 
1431     if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1432         return -EINVAL;
1433     if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1434         return -EINVAL;
1435 
1436     entry->low_mark = request->low_mark;
1437     entry->high_mark = request->high_mark;
1438 
1439     return 0;
1440 }
1441 
1442 /*
1443  * Unreserve the buffers in list, previously reserved using drmDMA.
1444  *
1445  * \param inode device inode.
1446  * \param file_priv DRM file private.
1447  * \param cmd command.
1448  * \param arg pointer to a drm_buf_free structure.
1449  * \return zero on success or a negative number on failure.
1450  *
1451  * Calls free_buffer() for each used buffer.
1452  * This function is primarily used for debugging.
1453  */
1454 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1455             struct drm_file *file_priv)
1456 {
1457     struct drm_device_dma *dma = dev->dma;
1458     struct drm_buf_free *request = data;
1459     int i;
1460     int idx;
1461     struct drm_buf *buf;
1462 
1463     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1464         return -EOPNOTSUPP;
1465 
1466     if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1467         return -EOPNOTSUPP;
1468 
1469     if (!dma)
1470         return -EINVAL;
1471 
1472     DRM_DEBUG("%d\n", request->count);
1473     for (i = 0; i < request->count; i++) {
1474         if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1475             return -EFAULT;
1476         if (idx < 0 || idx >= dma->buf_count) {
1477             DRM_ERROR("Index %d (of %d max)\n",
1478                   idx, dma->buf_count - 1);
1479             return -EINVAL;
1480         }
1481         idx = array_index_nospec(idx, dma->buf_count);
1482         buf = dma->buflist[idx];
1483         if (buf->file_priv != file_priv) {
1484             DRM_ERROR("Process %d freeing buffer not owned\n",
1485                   task_pid_nr(current));
1486             return -EINVAL;
1487         }
1488         drm_legacy_free_buffer(dev, buf);
1489     }
1490 
1491     return 0;
1492 }
1493 
1494 /*
1495  * Maps all of the DMA buffers into client-virtual space (ioctl).
1496  *
1497  * \param inode device inode.
1498  * \param file_priv DRM file private.
1499  * \param cmd command.
1500  * \param arg pointer to a drm_buf_map structure.
1501  * \return zero on success or a negative number on failure.
1502  *
1503  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1504  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1505  * offset equal to 0, which drm_mmap() interprets as PCI buffers and calls
1506  * drm_mmap_dma().
1507  */
1508 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1509              void __user **v,
1510              int (*f)(void *, int, unsigned long,
1511                  struct drm_buf *),
1512                  struct drm_file *file_priv)
1513 {
1514     struct drm_device_dma *dma = dev->dma;
1515     int retcode = 0;
1516     unsigned long virtual;
1517     int i;
1518 
1519     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1520         return -EOPNOTSUPP;
1521 
1522     if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1523         return -EOPNOTSUPP;
1524 
1525     if (!dma)
1526         return -EINVAL;
1527 
1528     spin_lock(&dev->buf_lock);
1529     if (atomic_read(&dev->buf_alloc)) {
1530         spin_unlock(&dev->buf_lock);
1531         return -EBUSY;
1532     }
1533     dev->buf_use++;     /* Can't allocate more after this call */
1534     spin_unlock(&dev->buf_lock);
1535 
1536     if (*p >= dma->buf_count) {
1537         if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1538             || (drm_core_check_feature(dev, DRIVER_SG)
1539             && (dma->flags & _DRM_DMA_USE_SG))) {
1540             struct drm_local_map *map = dev->agp_buffer_map;
1541             unsigned long token = dev->agp_buffer_token;
1542 
1543             if (!map) {
1544                 retcode = -EINVAL;
1545                 goto done;
1546             }
1547             virtual = vm_mmap(file_priv->filp, 0, map->size,
1548                       PROT_READ | PROT_WRITE,
1549                       MAP_SHARED,
1550                       token);
1551         } else {
1552             virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1553                       PROT_READ | PROT_WRITE,
1554                       MAP_SHARED, 0);
1555         }
1556         if (virtual > -1024UL) {
1557             /* Real error */
1558             retcode = (signed long)virtual;
1559             goto done;
1560         }
1561         *v = (void __user *)virtual;
1562 
1563         for (i = 0; i < dma->buf_count; i++) {
1564             if (f(data, i, virtual, dma->buflist[i]) < 0) {
1565                 retcode = -EFAULT;
1566                 goto done;
1567             }
1568         }
1569     }
1570       done:
1571     *p = dma->buf_count;
1572     DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1573 
1574     return retcode;
1575 }
1576 
1577 static int map_one_buf(void *data, int idx, unsigned long virtual,
1578             struct drm_buf *buf)
1579 {
1580     struct drm_buf_map *request = data;
1581     unsigned long address = virtual + buf->offset;  /* *** */
1582 
1583     if (copy_to_user(&request->list[idx].idx, &buf->idx,
1584              sizeof(request->list[0].idx)))
1585         return -EFAULT;
1586     if (copy_to_user(&request->list[idx].total, &buf->total,
1587              sizeof(request->list[0].total)))
1588         return -EFAULT;
1589     if (clear_user(&request->list[idx].used, sizeof(int)))
1590         return -EFAULT;
1591     if (copy_to_user(&request->list[idx].address, &address,
1592              sizeof(address)))
1593         return -EFAULT;
1594     return 0;
1595 }
1596 
1597 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1598                struct drm_file *file_priv)
1599 {
1600     struct drm_buf_map *request = data;
1601 
1602     return __drm_legacy_mapbufs(dev, data, &request->count,
1603                     &request->virtual, map_one_buf,
1604                     file_priv);
1605 }
1606 
1607 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1608           struct drm_file *file_priv)
1609 {
1610     if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1611         return -EOPNOTSUPP;
1612 
1613     if (dev->driver->dma_ioctl)
1614         return dev->driver->dma_ioctl(dev, data, file_priv);
1615     else
1616         return -EINVAL;
1617 }
1618 
1619 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1620 {
1621     struct drm_map_list *entry;
1622 
1623     list_for_each_entry(entry, &dev->maplist, head) {
1624         if (entry->map && entry->map->type == _DRM_SHM &&
1625             (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1626             return entry->map;
1627         }
1628     }
1629     return NULL;
1630 }
1631 EXPORT_SYMBOL(drm_legacy_getsarea);
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