LCOV - code coverage report
Current view: top level - drivers/gpu/drm - drm_agpsupport.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 151 0.0 %
Date: 2022-04-01 13:59:58 Functions: 0 18 0.0 %
Branches: 0 92 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * \file drm_agpsupport.c
       3                 :            :  * DRM support for AGP/GART backend
       4                 :            :  *
       5                 :            :  * \author Rickard E. (Rik) Faith <faith@valinux.com>
       6                 :            :  * \author Gareth Hughes <gareth@valinux.com>
       7                 :            :  */
       8                 :            : 
       9                 :            : /*
      10                 :            :  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
      11                 :            :  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
      12                 :            :  * All Rights Reserved.
      13                 :            :  *
      14                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a
      15                 :            :  * copy of this software and associated documentation files (the "Software"),
      16                 :            :  * to deal in the Software without restriction, including without limitation
      17                 :            :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      18                 :            :  * and/or sell copies of the Software, and to permit persons to whom the
      19                 :            :  * Software is furnished to do so, subject to the following conditions:
      20                 :            :  *
      21                 :            :  * The above copyright notice and this permission notice (including the next
      22                 :            :  * paragraph) shall be included in all copies or substantial portions of the
      23                 :            :  * Software.
      24                 :            :  *
      25                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      26                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      27                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
      28                 :            :  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
      29                 :            :  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
      30                 :            :  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
      31                 :            :  * OTHER DEALINGS IN THE SOFTWARE.
      32                 :            :  */
      33                 :            : 
      34                 :            : #include <linux/module.h>
      35                 :            : #include <linux/pci.h>
      36                 :            : #include <linux/slab.h>
      37                 :            : 
      38                 :            : #include <asm/agp.h>
      39                 :            : 
      40                 :            : #include <drm/drm_agpsupport.h>
      41                 :            : #include <drm/drm_device.h>
      42                 :            : #include <drm/drm_drv.h>
      43                 :            : #include <drm/drm_file.h>
      44                 :            : #include <drm/drm_print.h>
      45                 :            : 
      46                 :            : #include "drm_legacy.h"
      47                 :            : 
      48                 :            : /**
      49                 :            :  * Get AGP information.
      50                 :            :  *
      51                 :            :  * \param inode device inode.
      52                 :            :  * \param file_priv DRM file private.
      53                 :            :  * \param cmd command.
      54                 :            :  * \param arg pointer to a (output) drm_agp_info structure.
      55                 :            :  * \return zero on success or a negative number on failure.
      56                 :            :  *
      57                 :            :  * Verifies the AGP device has been initialized and acquired and fills in the
      58                 :            :  * drm_agp_info structure with the information in drm_agp_head::agp_info.
      59                 :            :  */
      60                 :          0 : int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
      61                 :            : {
      62                 :          0 :         struct agp_kern_info *kern;
      63                 :            : 
      64   [ #  #  #  # ]:          0 :         if (!dev->agp || !dev->agp->acquired)
      65                 :            :                 return -EINVAL;
      66                 :            : 
      67                 :          0 :         kern = &dev->agp->agp_info;
      68                 :          0 :         info->agp_version_major = kern->version.major;
      69                 :          0 :         info->agp_version_minor = kern->version.minor;
      70                 :          0 :         info->mode = kern->mode;
      71                 :          0 :         info->aperture_base = kern->aper_base;
      72                 :          0 :         info->aperture_size = kern->aper_size * 1024 * 1024;
      73                 :          0 :         info->memory_allowed = kern->max_memory << PAGE_SHIFT;
      74                 :          0 :         info->memory_used = kern->current_memory << PAGE_SHIFT;
      75                 :          0 :         info->id_vendor = kern->device->vendor;
      76                 :          0 :         info->id_device = kern->device->device;
      77                 :            : 
      78                 :          0 :         return 0;
      79                 :            : }
      80                 :            : EXPORT_SYMBOL(drm_agp_info);
      81                 :            : 
      82                 :          0 : int drm_agp_info_ioctl(struct drm_device *dev, void *data,
      83                 :            :                        struct drm_file *file_priv)
      84                 :            : {
      85                 :          0 :         struct drm_agp_info *info = data;
      86                 :          0 :         int err;
      87                 :            : 
      88                 :          0 :         err = drm_agp_info(dev, info);
      89         [ #  # ]:          0 :         if (err)
      90                 :          0 :                 return err;
      91                 :            : 
      92                 :            :         return 0;
      93                 :            : }
      94                 :            : 
      95                 :            : /**
      96                 :            :  * Acquire the AGP device.
      97                 :            :  *
      98                 :            :  * \param dev DRM device that is to acquire AGP.
      99                 :            :  * \return zero on success or a negative number on failure.
     100                 :            :  *
     101                 :            :  * Verifies the AGP device hasn't been acquired before and calls
     102                 :            :  * \c agp_backend_acquire.
     103                 :            :  */
     104                 :          0 : int drm_agp_acquire(struct drm_device *dev)
     105                 :            : {
     106         [ #  # ]:          0 :         if (!dev->agp)
     107                 :            :                 return -ENODEV;
     108         [ #  # ]:          0 :         if (dev->agp->acquired)
     109                 :            :                 return -EBUSY;
     110                 :          0 :         dev->agp->bridge = agp_backend_acquire(dev->pdev);
     111         [ #  # ]:          0 :         if (!dev->agp->bridge)
     112                 :            :                 return -ENODEV;
     113                 :          0 :         dev->agp->acquired = 1;
     114                 :          0 :         return 0;
     115                 :            : }
     116                 :            : EXPORT_SYMBOL(drm_agp_acquire);
     117                 :            : 
     118                 :            : /**
     119                 :            :  * Acquire the AGP device (ioctl).
     120                 :            :  *
     121                 :            :  * \param inode device inode.
     122                 :            :  * \param file_priv DRM file private.
     123                 :            :  * \param cmd command.
     124                 :            :  * \param arg user argument.
     125                 :            :  * \return zero on success or a negative number on failure.
     126                 :            :  *
     127                 :            :  * Verifies the AGP device hasn't been acquired before and calls
     128                 :            :  * \c agp_backend_acquire.
     129                 :            :  */
     130                 :          0 : int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
     131                 :            :                           struct drm_file *file_priv)
     132                 :            : {
     133                 :          0 :         return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
     134                 :            : }
     135                 :            : 
     136                 :            : /**
     137                 :            :  * Release the AGP device.
     138                 :            :  *
     139                 :            :  * \param dev DRM device that is to release AGP.
     140                 :            :  * \return zero on success or a negative number on failure.
     141                 :            :  *
     142                 :            :  * Verifies the AGP device has been acquired and calls \c agp_backend_release.
     143                 :            :  */
     144                 :          0 : int drm_agp_release(struct drm_device *dev)
     145                 :            : {
     146   [ #  #  #  #  :          0 :         if (!dev->agp || !dev->agp->acquired)
                   #  # ]
     147                 :            :                 return -EINVAL;
     148                 :          0 :         agp_backend_release(dev->agp->bridge);
     149                 :          0 :         dev->agp->acquired = 0;
     150                 :          0 :         return 0;
     151                 :            : }
     152                 :            : EXPORT_SYMBOL(drm_agp_release);
     153                 :            : 
     154                 :          0 : int drm_agp_release_ioctl(struct drm_device *dev, void *data,
     155                 :            :                           struct drm_file *file_priv)
     156                 :            : {
     157         [ #  # ]:          0 :         return drm_agp_release(dev);
     158                 :            : }
     159                 :            : 
     160                 :            : /**
     161                 :            :  * Enable the AGP bus.
     162                 :            :  *
     163                 :            :  * \param dev DRM device that has previously acquired AGP.
     164                 :            :  * \param mode Requested AGP mode.
     165                 :            :  * \return zero on success or a negative number on failure.
     166                 :            :  *
     167                 :            :  * Verifies the AGP device has been acquired but not enabled, and calls
     168                 :            :  * \c agp_enable.
     169                 :            :  */
     170                 :          0 : int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode)
     171                 :            : {
     172   [ #  #  #  # ]:          0 :         if (!dev->agp || !dev->agp->acquired)
     173                 :            :                 return -EINVAL;
     174                 :            : 
     175                 :          0 :         dev->agp->mode = mode.mode;
     176                 :          0 :         agp_enable(dev->agp->bridge, mode.mode);
     177                 :          0 :         dev->agp->enabled = 1;
     178                 :          0 :         return 0;
     179                 :            : }
     180                 :            : EXPORT_SYMBOL(drm_agp_enable);
     181                 :            : 
     182                 :          0 : int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
     183                 :            :                          struct drm_file *file_priv)
     184                 :            : {
     185                 :          0 :         struct drm_agp_mode *mode = data;
     186                 :            : 
     187                 :          0 :         return drm_agp_enable(dev, *mode);
     188                 :            : }
     189                 :            : 
     190                 :            : /**
     191                 :            :  * Allocate AGP memory.
     192                 :            :  *
     193                 :            :  * \param inode device inode.
     194                 :            :  * \param file_priv file private pointer.
     195                 :            :  * \param cmd command.
     196                 :            :  * \param arg pointer to a drm_agp_buffer structure.
     197                 :            :  * \return zero on success or a negative number on failure.
     198                 :            :  *
     199                 :            :  * Verifies the AGP device is present and has been acquired, allocates the
     200                 :            :  * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
     201                 :            :  */
     202                 :          0 : int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
     203                 :            : {
     204                 :          0 :         struct drm_agp_mem *entry;
     205                 :          0 :         struct agp_memory *memory;
     206                 :          0 :         unsigned long pages;
     207                 :          0 :         u32 type;
     208                 :            : 
     209   [ #  #  #  # ]:          0 :         if (!dev->agp || !dev->agp->acquired)
     210                 :            :                 return -EINVAL;
     211                 :          0 :         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
     212         [ #  # ]:          0 :         if (!entry)
     213                 :            :                 return -ENOMEM;
     214                 :            : 
     215                 :          0 :         pages = DIV_ROUND_UP(request->size, PAGE_SIZE);
     216                 :          0 :         type = (u32) request->type;
     217                 :          0 :         memory = agp_allocate_memory(dev->agp->bridge, pages, type);
     218         [ #  # ]:          0 :         if (!memory) {
     219                 :          0 :                 kfree(entry);
     220                 :          0 :                 return -ENOMEM;
     221                 :            :         }
     222                 :            : 
     223                 :          0 :         entry->handle = (unsigned long)memory->key + 1;
     224                 :          0 :         entry->memory = memory;
     225                 :          0 :         entry->bound = 0;
     226                 :          0 :         entry->pages = pages;
     227                 :          0 :         list_add(&entry->head, &dev->agp->memory);
     228                 :            : 
     229                 :          0 :         request->handle = entry->handle;
     230                 :          0 :         request->physical = memory->physical;
     231                 :            : 
     232                 :          0 :         return 0;
     233                 :            : }
     234                 :            : EXPORT_SYMBOL(drm_agp_alloc);
     235                 :            : 
     236                 :            : 
     237                 :          0 : int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
     238                 :            :                         struct drm_file *file_priv)
     239                 :            : {
     240                 :          0 :         struct drm_agp_buffer *request = data;
     241                 :            : 
     242                 :          0 :         return drm_agp_alloc(dev, request);
     243                 :            : }
     244                 :            : 
     245                 :            : /**
     246                 :            :  * Search for the AGP memory entry associated with a handle.
     247                 :            :  *
     248                 :            :  * \param dev DRM device structure.
     249                 :            :  * \param handle AGP memory handle.
     250                 :            :  * \return pointer to the drm_agp_mem structure associated with \p handle.
     251                 :            :  *
     252                 :            :  * Walks through drm_agp_head::memory until finding a matching handle.
     253                 :            :  */
     254                 :          0 : static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device *dev,
     255                 :            :                                                 unsigned long handle)
     256                 :            : {
     257                 :          0 :         struct drm_agp_mem *entry;
     258                 :            : 
     259   [ #  #  #  #  :          0 :         list_for_each_entry(entry, &dev->agp->memory, head) {
                   #  # ]
     260   [ #  #  #  #  :          0 :                 if (entry->handle == handle)
                   #  # ]
     261                 :            :                         return entry;
     262                 :            :         }
     263                 :            :         return NULL;
     264                 :            : }
     265                 :            : 
     266                 :            : /**
     267                 :            :  * Unbind AGP memory from the GATT (ioctl).
     268                 :            :  *
     269                 :            :  * \param inode device inode.
     270                 :            :  * \param file_priv DRM file private.
     271                 :            :  * \param cmd command.
     272                 :            :  * \param arg pointer to a drm_agp_binding structure.
     273                 :            :  * \return zero on success or a negative number on failure.
     274                 :            :  *
     275                 :            :  * Verifies the AGP device is present and acquired, looks-up the AGP memory
     276                 :            :  * entry and passes it to the unbind_agp() function.
     277                 :            :  */
     278                 :          0 : int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
     279                 :            : {
     280                 :          0 :         struct drm_agp_mem *entry;
     281                 :          0 :         int ret;
     282                 :            : 
     283   [ #  #  #  # ]:          0 :         if (!dev->agp || !dev->agp->acquired)
     284                 :            :                 return -EINVAL;
     285                 :          0 :         entry = drm_agp_lookup_entry(dev, request->handle);
     286   [ #  #  #  # ]:          0 :         if (!entry || !entry->bound)
     287                 :            :                 return -EINVAL;
     288                 :          0 :         ret = drm_unbind_agp(entry->memory);
     289         [ #  # ]:          0 :         if (ret == 0)
     290                 :          0 :                 entry->bound = 0;
     291                 :            :         return ret;
     292                 :            : }
     293                 :            : EXPORT_SYMBOL(drm_agp_unbind);
     294                 :            : 
     295                 :            : 
     296                 :          0 : int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
     297                 :            :                          struct drm_file *file_priv)
     298                 :            : {
     299                 :          0 :         struct drm_agp_binding *request = data;
     300                 :            : 
     301                 :          0 :         return drm_agp_unbind(dev, request);
     302                 :            : }
     303                 :            : 
     304                 :            : /**
     305                 :            :  * Bind AGP memory into the GATT (ioctl)
     306                 :            :  *
     307                 :            :  * \param inode device inode.
     308                 :            :  * \param file_priv DRM file private.
     309                 :            :  * \param cmd command.
     310                 :            :  * \param arg pointer to a drm_agp_binding structure.
     311                 :            :  * \return zero on success or a negative number on failure.
     312                 :            :  *
     313                 :            :  * Verifies the AGP device is present and has been acquired and that no memory
     314                 :            :  * is currently bound into the GATT. Looks-up the AGP memory entry and passes
     315                 :            :  * it to bind_agp() function.
     316                 :            :  */
     317                 :          0 : int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
     318                 :            : {
     319                 :          0 :         struct drm_agp_mem *entry;
     320                 :          0 :         int retcode;
     321                 :          0 :         int page;
     322                 :            : 
     323   [ #  #  #  # ]:          0 :         if (!dev->agp || !dev->agp->acquired)
     324                 :            :                 return -EINVAL;
     325                 :          0 :         entry = drm_agp_lookup_entry(dev, request->handle);
     326   [ #  #  #  # ]:          0 :         if (!entry || entry->bound)
     327                 :            :                 return -EINVAL;
     328                 :          0 :         page = DIV_ROUND_UP(request->offset, PAGE_SIZE);
     329                 :          0 :         retcode = drm_bind_agp(entry->memory, page);
     330         [ #  # ]:          0 :         if (retcode)
     331                 :            :                 return retcode;
     332                 :          0 :         entry->bound = dev->agp->base + (page << PAGE_SHIFT);
     333                 :          0 :         DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
     334                 :            :                   dev->agp->base, entry->bound);
     335                 :          0 :         return 0;
     336                 :            : }
     337                 :            : EXPORT_SYMBOL(drm_agp_bind);
     338                 :            : 
     339                 :            : 
     340                 :          0 : int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
     341                 :            :                        struct drm_file *file_priv)
     342                 :            : {
     343                 :          0 :         struct drm_agp_binding *request = data;
     344                 :            : 
     345                 :          0 :         return drm_agp_bind(dev, request);
     346                 :            : }
     347                 :            : 
     348                 :            : /**
     349                 :            :  * Free AGP memory (ioctl).
     350                 :            :  *
     351                 :            :  * \param inode device inode.
     352                 :            :  * \param file_priv DRM file private.
     353                 :            :  * \param cmd command.
     354                 :            :  * \param arg pointer to a drm_agp_buffer structure.
     355                 :            :  * \return zero on success or a negative number on failure.
     356                 :            :  *
     357                 :            :  * Verifies the AGP device is present and has been acquired and looks up the
     358                 :            :  * AGP memory entry. If the memory is currently bound, unbind it via
     359                 :            :  * unbind_agp(). Frees it via free_agp() as well as the entry itself
     360                 :            :  * and unlinks from the doubly linked list it's inserted in.
     361                 :            :  */
     362                 :          0 : int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
     363                 :            : {
     364                 :          0 :         struct drm_agp_mem *entry;
     365                 :            : 
     366   [ #  #  #  # ]:          0 :         if (!dev->agp || !dev->agp->acquired)
     367                 :            :                 return -EINVAL;
     368                 :          0 :         entry = drm_agp_lookup_entry(dev, request->handle);
     369         [ #  # ]:          0 :         if (!entry)
     370                 :            :                 return -EINVAL;
     371         [ #  # ]:          0 :         if (entry->bound)
     372                 :          0 :                 drm_unbind_agp(entry->memory);
     373                 :            : 
     374                 :          0 :         list_del(&entry->head);
     375                 :            : 
     376                 :          0 :         drm_free_agp(entry->memory, entry->pages);
     377                 :          0 :         kfree(entry);
     378                 :          0 :         return 0;
     379                 :            : }
     380                 :            : EXPORT_SYMBOL(drm_agp_free);
     381                 :            : 
     382                 :            : 
     383                 :          0 : int drm_agp_free_ioctl(struct drm_device *dev, void *data,
     384                 :            :                        struct drm_file *file_priv)
     385                 :            : {
     386                 :          0 :         struct drm_agp_buffer *request = data;
     387                 :            : 
     388                 :          0 :         return drm_agp_free(dev, request);
     389                 :            : }
     390                 :            : 
     391                 :            : /**
     392                 :            :  * Initialize the AGP resources.
     393                 :            :  *
     394                 :            :  * \return pointer to a drm_agp_head structure.
     395                 :            :  *
     396                 :            :  * Gets the drm_agp_t structure which is made available by the agpgart module
     397                 :            :  * via the inter_module_* functions. Creates and initializes a drm_agp_head
     398                 :            :  * structure.
     399                 :            :  *
     400                 :            :  * Note that final cleanup of the kmalloced structure is directly done in
     401                 :            :  * drm_pci_agp_destroy.
     402                 :            :  */
     403                 :          0 : struct drm_agp_head *drm_agp_init(struct drm_device *dev)
     404                 :            : {
     405                 :          0 :         struct drm_agp_head *head = NULL;
     406                 :            : 
     407                 :          0 :         head = kzalloc(sizeof(*head), GFP_KERNEL);
     408         [ #  # ]:          0 :         if (!head)
     409                 :            :                 return NULL;
     410                 :          0 :         head->bridge = agp_find_bridge(dev->pdev);
     411         [ #  # ]:          0 :         if (!head->bridge) {
     412                 :          0 :                 head->bridge = agp_backend_acquire(dev->pdev);
     413         [ #  # ]:          0 :                 if (!head->bridge) {
     414                 :          0 :                         kfree(head);
     415                 :          0 :                         return NULL;
     416                 :            :                 }
     417                 :          0 :                 agp_copy_info(head->bridge, &head->agp_info);
     418                 :          0 :                 agp_backend_release(head->bridge);
     419                 :            :         } else {
     420                 :          0 :                 agp_copy_info(head->bridge, &head->agp_info);
     421                 :            :         }
     422         [ #  # ]:          0 :         if (head->agp_info.chipset == NOT_SUPPORTED) {
     423                 :          0 :                 kfree(head);
     424                 :          0 :                 return NULL;
     425                 :            :         }
     426                 :          0 :         INIT_LIST_HEAD(&head->memory);
     427                 :          0 :         head->cant_use_aperture = head->agp_info.cant_use_aperture;
     428                 :          0 :         head->page_mask = head->agp_info.page_mask;
     429                 :          0 :         head->base = head->agp_info.aper_base;
     430                 :          0 :         return head;
     431                 :            : }
     432                 :            : /* Only exported for i810.ko */
     433                 :            : EXPORT_SYMBOL(drm_agp_init);
     434                 :            : 
     435                 :            : /**
     436                 :            :  * drm_legacy_agp_clear - Clear AGP resource list
     437                 :            :  * @dev: DRM device
     438                 :            :  *
     439                 :            :  * Iterate over all AGP resources and remove them. But keep the AGP head
     440                 :            :  * intact so it can still be used. It is safe to call this if AGP is disabled or
     441                 :            :  * was already removed.
     442                 :            :  *
     443                 :            :  * Cleanup is only done for drivers who have DRIVER_LEGACY set.
     444                 :            :  */
     445                 :          0 : void drm_legacy_agp_clear(struct drm_device *dev)
     446                 :            : {
     447                 :          0 :         struct drm_agp_mem *entry, *tempe;
     448                 :            : 
     449         [ #  # ]:          0 :         if (!dev->agp)
     450                 :            :                 return;
     451         [ #  # ]:          0 :         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
     452                 :            :                 return;
     453                 :            : 
     454         [ #  # ]:          0 :         list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
     455         [ #  # ]:          0 :                 if (entry->bound)
     456                 :          0 :                         drm_unbind_agp(entry->memory);
     457                 :          0 :                 drm_free_agp(entry->memory, entry->pages);
     458                 :          0 :                 kfree(entry);
     459                 :            :         }
     460         [ #  # ]:          0 :         INIT_LIST_HEAD(&dev->agp->memory);
     461                 :            : 
     462         [ #  # ]:          0 :         if (dev->agp->acquired)
     463                 :          0 :                 drm_agp_release(dev);
     464                 :            : 
     465                 :          0 :         dev->agp->acquired = 0;
     466                 :          0 :         dev->agp->enabled = 0;
     467                 :            : }

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