RT-AC66 3.0.0.4.374.130 core

[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / char / drm / drm_drv.c

/**
 * \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 inode *inode, struct file *filp,
                       unsigned int cmd, unsigned long arg);

/** Ioctl table */
static drm_ioctl_desc_t drm_ioctls[] = {
        [DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = {drm_version, 0},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = {drm_getunique, 0},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = {drm_getmagic, 0},
        [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = {drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)] = {drm_getmap, 0},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)] = {drm_getclient, 0},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)] = {drm_getstats, 0},
        [DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)] = {drm_setversion, DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = {drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = {drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = {drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)] = {drm_rmmap_ioctl, DRM_AUTH},

        [DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = {drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = {drm_getsareactx, DRM_AUTH},

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = {drm_addctx, DRM_AUTH|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = {drm_rmctx, DRM_AUTH|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = {drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = {drm_getctx, DRM_AUTH},
        [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = {drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = {drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = {drm_resctx, DRM_AUTH},

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = {drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = {drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

        [DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = {drm_lock, DRM_AUTH},
        [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = {drm_unlock, DRM_AUTH},

        [DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = {drm_noop, DRM_AUTH},

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)] = {drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)] = {drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)] = {drm_infobufs, DRM_AUTH},
        [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)] = {drm_mapbufs, DRM_AUTH},
        [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)] = {drm_freebufs, DRM_AUTH},
        /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
        [DRM_IOCTL_NR(DRM_IOCTL_DMA)] = {NULL, DRM_AUTH},

        [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)] = {drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

#if __OS_HAS_AGP
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info_ioctl, DRM_AUTH},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
#endif

        [DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)] = {drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
        [DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)] = {drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},

        [DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)] = {drm_wait_vblank, 0},

        [DRM_IOCTL_NR(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(drm_device_t * dev)
{
        drm_magic_entry_t *pt, *next;
        drm_map_list_t *r_list;
        drm_vma_entry_t *vma, *vma_next;
        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);

        /* Free drawable information memory */
        for (i = 0; i < dev->drw_bitfield_length / sizeof(*dev->drw_bitfield);
             i++) {
                drm_drawable_info_t *info = drm_get_drawable_info(dev, i);

                if (info) {
                        drm_free(info->rects, info->num_rects *
                                 sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
                        drm_free(info, sizeof(*info), DRM_MEM_BUFS);
                }
        }

        mutex_lock(&dev->struct_mutex);
        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) {
                drm_agp_mem_t *entry;
                drm_agp_mem_t *nexte;

                /* Remove AGP resources, but leave dev->agp
                   intact until drv_cleanup is called. */
                for (entry = dev->agp->memory; entry; entry = nexte) {
                        nexte = entry->next;
                        if (entry->bound)
                                drm_unbind_agp(entry->memory);
                        drm_free_agp(entry->memory, entry->pages);
                        drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
                }
                dev->agp->memory = NULL;

                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) */
        if (dev->vmalist) {
                for (vma = dev->vmalist; vma; vma = vma_next) {
                        vma_next = vma->next;
                        drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
                }
                dev->vmalist = NULL;
        }

        if (dev->maplist) {
                while (!list_empty(&dev->maplist->head)) {
                        struct list_head *list = dev->maplist->head.next;
                        r_list = list_entry(list, drm_map_list_t, head);
                        drm_rmmap_locked(dev, r_list->map);
                }
        }

        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.filp = 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");

        drm_mem_init();

        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(drm_device_t * dev)
{
        DRM_DEBUG("\n");

        if (!dev) {
                DRM_ERROR("cleanup called no dev\n");
                return;
        }

        drm_lastclose(dev);

        if (dev->maplist) {
                drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
                dev->maplist = NULL;
                drm_ht_remove(&dev->map_hash);
        }

        drm_ctxbitmap_cleanup(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_put_head(&dev->primary);
        if (drm_put_dev(dev))
                DRM_ERROR("Cannot unload module\n");
}

void drm_exit(struct drm_driver *driver)
{
        int i;
        drm_device_t *dev = NULL;
        drm_head_t *head;

        DRM_DEBUG("\n");

        for (i = 0; i < drm_cards_limit; i++) {
                head = drm_heads[i];
                if (!head)
                        continue;
                if (!head->dev)
                        continue;
                if (head->dev->driver != driver)
                        continue;
                dev = head->dev;
                if (dev) {
                        /* release the pci driver */
                        if (dev->pdev)
                                pci_dev_put(dev->pdev);
                        drm_cleanup(dev);
                }
        }
        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;

        drm_cards_limit =
            (drm_cards_limit <
             DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
        drm_heads =
            drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
        if (!drm_heads)
                goto err_p1;

        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_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(drm_class);
      err_p2:
        unregister_chrdev(DRM_MAJOR, "drm");
        drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
      err_p1:
        return ret;
}

static void __exit drm_core_exit(void)
{
        remove_proc_entry("dri", NULL);
        drm_sysfs_destroy(drm_class);

        unregister_chrdev(DRM_MAJOR, "drm");

        drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
}

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 inode *inode, struct file *filp,
                       unsigned int cmd, unsigned long arg)
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->head->dev;
        drm_version_t __user *argp = (void __user *)arg;
        drm_version_t version;
        int len;

        if (copy_from_user(&version, argp, sizeof(version)))
                return -EFAULT;

        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);

        if (copy_to_user(argp, &version, sizeof(version)))
                return -EFAULT;
        return 0;
}

/**
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \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)
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->head->dev;
        drm_ioctl_desc_t *ioctl;
        drm_ioctl_t *func;
        unsigned int nr = DRM_IOCTL_NR(cmd);
        int retcode = -EINVAL;

        atomic_inc(&dev->ioctl_count);
        atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
        ++priv->ioctl_count;

        DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
                  current->pid, cmd, nr,
                  (long)old_encode_dev(priv->head->device),
                  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];
        else
                goto err_i1;

        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) && !priv->authenticated) ||
                   ((ioctl->flags & DRM_MASTER) && !priv->master)) {
                retcode = -EACCES;
        } else {
                retcode = func(inode, filp, cmd, arg);
        }

      err_i1:
        atomic_dec(&dev->ioctl_count);
        if (retcode)
                DRM_DEBUG("ret = %x\n", retcode);
        return retcode;
}

EXPORT_SYMBOL(drm_ioctl);