1 files changed, 540 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
new file mode 100644
index 000000000000..564138714bb5
--- /dev/null
+++ b/drivers/gpu/drm/drm_drv.c
@@ -0,0 +1,540 @@
+/**
+ * \file drm_drv.c
+ * Generic driver template
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ *
+ * To use this template, you must at least define the following (samples
+ * given for the MGA driver):
+ *
+ * \code
+ * #define DRIVER_AUTHOR        "VA Linux Systems, Inc."
+ *
+ * #define DRIVER_NAME          "mga"
+ * #define DRIVER_DESC          "Matrox G200/G400"
+ * #define DRIVER_DATE          "20001127"
+ *
+ * #define drm_x                mga_##x
+ * \endcode
+ */
+
+/*
+ * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
+ *
+ * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+#include "drm_core.h"
+
+static int drm_version(struct drm_device *dev, void *data,
+                       struct drm_file *file_priv);
+
+/** Ioctl table */
+static struct drm_ioctl_desc drm_ioctls[] = {
+        DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
+        DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
+        DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
+        DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
+        DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
+        DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
+        DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
+        /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
+        DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+#if __OS_HAS_AGP
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+#endif
+
+        DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+        DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),
+
+        DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+};
+
+#define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
+
+/**
+ * Take down the DRM device.
+ *
+ * \param dev DRM device structure.
+ *
+ * Frees every resource in \p dev.
+ *
+ * \sa drm_device
+ */
+int drm_lastclose(struct drm_device * dev)
+{
+        struct drm_magic_entry *pt, *next;
+        struct drm_map_list *r_list, *list_t;
+        struct drm_vma_entry *vma, *vma_temp;
+        int i;
+
+        DRM_DEBUG("\n");
+
+        if (dev->driver->lastclose)
+                dev->driver->lastclose(dev);
+        DRM_DEBUG("driver lastclose completed\n");
+
+        if (dev->unique) {
+                drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
+                dev->unique = NULL;
+                dev->unique_len = 0;
+        }
+
+        if (dev->irq_enabled)
+                drm_irq_uninstall(dev);
+
+        mutex_lock(&dev->struct_mutex);
+
+        /* Free drawable information memory */
+        drm_drawable_free_all(dev);
+        del_timer(&dev->timer);
+
+        /* Clear pid list */
+        if (dev->magicfree.next) {
+                list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
+                        list_del(&pt->head);
+                        drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
+                        drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
+                }
+                drm_ht_remove(&dev->magiclist);
+        }
+
+        /* Clear AGP information */
+        if (drm_core_has_AGP(dev) && dev->agp) {
+                struct drm_agp_mem *entry, *tempe;
+
+                /* Remove AGP resources, but leave dev->agp
+                   intact until drv_cleanup is called. */
+                list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
+                        if (entry->bound)
+                                drm_unbind_agp(entry->memory);
+                        drm_free_agp(entry->memory, entry->pages);
+                        drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
+                }
+                INIT_LIST_HEAD(&dev->agp->memory);
+
+                if (dev->agp->acquired)
+                        drm_agp_release(dev);
+
+                dev->agp->acquired = 0;
+                dev->agp->enabled = 0;
+        }
+        if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
+                drm_sg_cleanup(dev->sg);
+                dev->sg = NULL;
+        }
+
+        /* Clear vma list (only built for debugging) */
+        list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
+                list_del(&vma->head);
+                drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
+        }
+
+        list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
+                if (!(r_list->map->flags & _DRM_DRIVER)) {
+                        drm_rmmap_locked(dev, r_list->map);
+                        r_list = NULL;
+                }
+        }
+
+        if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
+                for (i = 0; i < dev->queue_count; i++) {
+                        if (dev->queuelist[i]) {
+                                drm_free(dev->queuelist[i],
+                                         sizeof(*dev->queuelist[0]),
+                                         DRM_MEM_QUEUES);
+                                dev->queuelist[i] = NULL;
+                        }
+                }
+                drm_free(dev->queuelist,
+                         dev->queue_slots * sizeof(*dev->queuelist),
+                         DRM_MEM_QUEUES);
+                dev->queuelist = NULL;
+        }
+        dev->queue_count = 0;
+
+        if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+                drm_dma_takedown(dev);
+
+        if (dev->lock.hw_lock) {
+                dev->sigdata.lock = dev->lock.hw_lock = NULL;   /* SHM removed */
+                dev->lock.file_priv = NULL;
+                wake_up_interruptible(&dev->lock.lock_queue);
+        }
+        mutex_unlock(&dev->struct_mutex);
+
+        DRM_DEBUG("lastclose completed\n");
+        return 0;
+}
+
+/**
+ * Module initialization. Called via init_module at module load time, or via
+ * linux/init/main.c (this is not currently supported).
+ *
+ * \return zero on success or a negative number on failure.
+ *
+ * Initializes an array of drm_device structures, and attempts to
+ * initialize all available devices, using consecutive minors, registering the
+ * stubs and initializing the AGP device.
+ *
+ * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
+ * after the initialization for driver customization.
+ */
+int drm_init(struct drm_driver *driver)
+{
+        struct pci_dev *pdev = NULL;
+        struct pci_device_id *pid;
+        int i;
+
+        DRM_DEBUG("\n");
+
+        for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
+                pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
+
+                pdev = NULL;
+                /* pass back in pdev to account for multiple identical cards */
+                while ((pdev =
+                        pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
+                                       pid->subdevice, pdev)) != NULL) {
+                        /* stealth mode requires a manual probe */
+                        pci_dev_get(pdev);
+                        drm_get_dev(pdev, pid, driver);
+                }
+        }
+        return 0;
+}
+
+EXPORT_SYMBOL(drm_init);
+
+/**
+ * Called via cleanup_module() at module unload time.
+ *
+ * Cleans up all DRM device, calling drm_lastclose().
+ *
+ * \sa drm_init
+ */
+static void drm_cleanup(struct drm_device * dev)
+{
+        DRM_DEBUG("\n");
+
+        if (!dev) {
+                DRM_ERROR("cleanup called no dev\n");
+                return;
+        }
+
+        drm_lastclose(dev);
+
+        if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
+            dev->agp && dev->agp->agp_mtrr >= 0) {
+                int retval;
+                retval = mtrr_del(dev->agp->agp_mtrr,
+                                  dev->agp->agp_info.aper_base,
+                                  dev->agp->agp_info.aper_size * 1024 * 1024);
+                DRM_DEBUG("mtrr_del=%d\n", retval);
+        }
+
+        if (drm_core_has_AGP(dev) && dev->agp) {
+                drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
+                dev->agp = NULL;
+        }
+
+        if (dev->driver->unload)
+                dev->driver->unload(dev);
+
+        drm_ht_remove(&dev->map_hash);
+        drm_ctxbitmap_cleanup(dev);
+
+        drm_put_minor(&dev->primary);
+        if (drm_put_dev(dev))
+                DRM_ERROR("Cannot unload module\n");
+}
+
+int drm_minors_cleanup(int id, void *ptr, void *data)
+{
+        struct drm_minor *minor = ptr;
+        struct drm_device *dev;
+        struct drm_driver *driver = data;
+
+        dev = minor->dev;
+        if (minor->dev->driver != driver)
+                return 0;
+
+        if (minor->type != DRM_MINOR_LEGACY)
+                return 0;
+
+        if (dev)
+                pci_dev_put(dev->pdev);
+        drm_cleanup(dev);
+        return 1;
+}
+
+void drm_exit(struct drm_driver *driver)
+{
+        DRM_DEBUG("\n");
+
+        idr_for_each(&drm_minors_idr, &drm_minors_cleanup, driver);
+
+        DRM_INFO("Module unloaded\n");
+}
+
+EXPORT_SYMBOL(drm_exit);
+
+/** File operations structure */
+static const struct file_operations drm_stub_fops = {
+        .owner = THIS_MODULE,
+        .open = drm_stub_open
+};
+
+static int __init drm_core_init(void)
+{
+        int ret = -ENOMEM;
+
+        idr_init(&drm_minors_idr);
+
+        if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
+                goto err_p1;
+
+        drm_class = drm_sysfs_create(THIS_MODULE, "drm");
+        if (IS_ERR(drm_class)) {
+                printk(KERN_ERR "DRM: Error creating drm class.\n");
+                ret = PTR_ERR(drm_class);
+                goto err_p2;
+        }
+
+        drm_proc_root = proc_mkdir("dri", NULL);
+        if (!drm_proc_root) {
+                DRM_ERROR("Cannot create /proc/dri\n");
+                ret = -1;
+                goto err_p3;
+        }
+
+        drm_mem_init();
+
+        DRM_INFO("Initialized %s %d.%d.%d %s\n",
+                 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
+        return 0;
+err_p3:
+        drm_sysfs_destroy();
+err_p2:
+        unregister_chrdev(DRM_MAJOR, "drm");
+
+        idr_destroy(&drm_minors_idr);
+err_p1:
+        return ret;
+}
+
+static void __exit drm_core_exit(void)
+{
+        remove_proc_entry("dri", NULL);
+        drm_sysfs_destroy();
+
+        unregister_chrdev(DRM_MAJOR, "drm");
+
+        idr_destroy(&drm_minors_idr);
+}
+
+module_init(drm_core_init);
+module_exit(drm_core_exit);
+
+/**
+ * Get version information
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_version structure.
+ * \return zero on success or negative number on failure.
+ *
+ * Fills in the version information in \p arg.
+ */
+static int drm_version(struct drm_device *dev, void *data,
+                       struct drm_file *file_priv)
+{
+        struct drm_version *version = data;
+        int len;
+
+        version->version_major = dev->driver->major;
+        version->version_minor = dev->driver->minor;
+        version->version_patchlevel = dev->driver->patchlevel;
+        DRM_COPY(version->name, dev->driver->name);
+        DRM_COPY(version->date, dev->driver->date);
+        DRM_COPY(version->desc, dev->driver->desc);
+
+        return 0;
+}
+
+/**
+ * Called whenever a process performs an ioctl on /dev/drm.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument.
+ * \return zero on success or negative number on failure.
+ *
+ * Looks up the ioctl function in the ::ioctls table, checking for root
+ * previleges if so required, and dispatches to the respective function.
+ */
+int drm_ioctl(struct inode *inode, struct file *filp,
+              unsigned int cmd, unsigned long arg)
+{
+        struct drm_file *file_priv = filp->private_data;
+        struct drm_device *dev = file_priv->minor->dev;
+        struct drm_ioctl_desc *ioctl;
+        drm_ioctl_t *func;
+        unsigned int nr = DRM_IOCTL_NR(cmd);
+        int retcode = -EINVAL;
+        char *kdata = NULL;
+
+        atomic_inc(&dev->ioctl_count);
+        atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
+        ++file_priv->ioctl_count;
+
+        DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
+                  task_pid_nr(current), cmd, nr,
+                  (long)old_encode_dev(file_priv->minor->device),
+                  file_priv->authenticated);
+
+        if ((nr >= DRM_CORE_IOCTL_COUNT) &&
+            ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
+                goto err_i1;
+        if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
+            (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
+                ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
+        else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
+                ioctl = &drm_ioctls[nr];
+                cmd = ioctl->cmd;
+        } else
+                goto err_i1;
+
+        /* Do not trust userspace, use our own definition */
+        func = ioctl->func;
+        /* is there a local override? */
+        if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
+                func = dev->driver->dma_ioctl;
+
+        if (!func) {
+                DRM_DEBUG("no function\n");
+                retcode = -EINVAL;
+        } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
+                   ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
+                   ((ioctl->flags & DRM_MASTER) && !file_priv->master)) {
+                retcode = -EACCES;
+        } else {
+                if (cmd & (IOC_IN | IOC_OUT)) {
+                        kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
+                        if (!kdata) {
+                                retcode = -ENOMEM;
+                                goto err_i1;
+                        }
+                }
+
+                if (cmd & IOC_IN) {
+                        if (copy_from_user(kdata, (void __user *)arg,
+                                           _IOC_SIZE(cmd)) != 0) {
+                                retcode = -EFAULT;
+                                goto err_i1;
+                        }
+                }
+                retcode = func(dev, kdata, file_priv);
+
+                if ((retcode == 0) && (cmd & IOC_OUT)) {
+                        if (copy_to_user((void __user *)arg, kdata,
+                                         _IOC_SIZE(cmd)) != 0)
+                                retcode = -EFAULT;
+                }
+        }
+
+      err_i1:
+        if (kdata)
+                kfree(kdata);
+        atomic_dec(&dev->ioctl_count);
+        if (retcode)
+                DRM_DEBUG("ret = %x\n", retcode);
+        return retcode;
+}
+
+EXPORT_SYMBOL(drm_ioctl);
+
+drm_local_map_t *drm_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_getsarea);