[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / drivers / char / drm / drm_drv.c

/**
 * \file drm_drv.h 
 * 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 DRIVER_IOCTL_COUNT   DRM_ARRAY_SIZE( mga_ioctls )
 *
 * #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"

/** Ioctl table */
drm_ioctl_desc_t                  drm_ioctls[] = {
        [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]       = { drm_version,     0, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)]    = { drm_getunique,   0, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]     = { drm_getmagic,    0, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]     = { drm_irq_by_busid, 0, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)]       = { drm_getmap,      0, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)]    = { drm_getclient,   0, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)]     = { drm_getstats,    0, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)]   = { drm_setversion,  0, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)]    = { drm_setunique,   1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]         = { drm_noop,        1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]       = { drm_noop,        1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)]    = { drm_authmagic,   1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]       = { drm_addmap,      1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)]        = { drm_rmmap,       1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = { drm_setsareactx, 1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = { drm_getsareactx, 1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]       = { drm_addctx,      1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]        = { drm_rmctx,       1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]       = { drm_modctx,      1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]       = { drm_getctx,      1, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)]    = { drm_switchctx,   1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]       = { drm_newctx,      1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]       = { drm_resctx,      1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]      = { drm_adddraw,     1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]       = { drm_rmdraw,      1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]          = { drm_lock,        1, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]        = { drm_unlock,      1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]        = { drm_noop,      1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]      = { drm_addbufs,     1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]     = { drm_markbufs,    1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]     = { drm_infobufs,    1, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]      = { drm_mapbufs,     1, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]     = { drm_freebufs,    1, 0 },
        /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */

        [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]       = { drm_control,     1, 1 },

#if __OS_HAS_AGP
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)]   = { drm_agp_acquire, 1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)]   = { drm_agp_release, 1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]    = { drm_agp_enable,  1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]      = { drm_agp_info,    1, 0 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]     = { drm_agp_alloc,   1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]      = { drm_agp_free,    1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]      = { drm_agp_bind,    1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]    = { drm_agp_unbind,  1, 1 },
#endif

        [DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)]      = { drm_sg_alloc,    1, 1 },
        [DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)]       = { drm_sg_free,     1, 1 },

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

#define DRIVER_IOCTL_COUNT      DRM_ARRAY_SIZE( drm_ioctls )

/**
 * Take down the DRM device.
 *
 * \param dev DRM device structure.
 *
 * Frees every resource in \p dev.
 *
 * \sa drm_device and setup().
 */
int drm_takedown( drm_device_t *dev )
{
        drm_magic_entry_t *pt, *next;
        drm_map_t *map;
        drm_map_list_t *r_list;
        struct list_head *list, *list_next;
        drm_vma_entry_t *vma, *vma_next;
        int i;

        DRM_DEBUG( "\n" );

        if (dev->driver->pretakedown)
          dev->driver->pretakedown(dev);

        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 );

        down( &dev->struct_sem );
        del_timer( &dev->timer );

                                /* Clear pid list */
        for ( i = 0 ; i < DRM_HASH_SIZE ; i++ ) {
                for ( pt = dev->magiclist[i].head ; pt ; pt = next ) {
                        next = pt->next;
                        drm_free( pt, sizeof(*pt), DRM_MEM_MAGIC );
                }
                dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
        }

                                /* 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_do_release(dev);

                dev->agp->acquired = 0;
                dev->agp->enabled  = 0;
        }

                                /* 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 ) {
                list_for_each_safe( list, list_next, &dev->maplist->head ) {
                        r_list = (drm_map_list_t *)list;

                        if ( ( map = r_list->map ) ) {
                                switch ( map->type ) {
                                case _DRM_REGISTERS:
                                case _DRM_FRAME_BUFFER:
                                        if (drm_core_has_MTRR(dev)) {
                                                if ( map->mtrr >= 0 ) {
                                                        int retcode;
                                                        retcode = mtrr_del( map->mtrr,
                                                                            map->offset,
                                                                            map->size );
                                                        DRM_DEBUG( "mtrr_del=%d\n", retcode );
                                                }
                                        }
                                        drm_ioremapfree( map->handle, map->size, dev );
                                        break;
                                case _DRM_SHM:
                                        vfree(map->handle);
                                        break;

                                case _DRM_AGP:
                                        /* Do nothing here, because this is all
                                         * handled in the AGP/GART driver.
                                         */
                                        break;
                                case _DRM_SCATTER_GATHER:
                                        /* Handle it */
                                        if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
                                                drm_sg_cleanup(dev->sg);
                                                dev->sg = NULL;
                                        }
                                        break;
                                }
                                drm_free(map, sizeof(*map), DRM_MEM_MAPS);
                        }
                        list_del( list );
                        drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
                }
                drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
                dev->maplist = 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.filp = NULL;
                wake_up_interruptible( &dev->lock.lock_queue );
        }
        up( &dev->struct_sem );

        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 takedown().
 * 
 * \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_takedown( dev );    

        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->postcleanup)
                dev->driver->postcleanup(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 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 = create_proc_entry("dri", S_IFDIR, 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.
 */
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 ret;

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

        /* version is a required function to return the personality module version */
        if ((ret = dev->driver->version(&version)))
                return ret;
                
        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 < DRIVER_IOCTL_COUNT)
                ioctl = &drm_ioctls[nr];
        else if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
                ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
        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->root_only && !capable( CAP_SYS_ADMIN ) )||
                    ( ioctl->auth_needed && !priv->authenticated ) ) {
                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);