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/* gamma.c -- 3dlabs GMX 2000 driver -*- linux-c -*-

 * Created: Mon Jan  4 08:58:31 1999 by faith@precisioninsight.com

 *

 * Copyright 1999 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

 * PRECISION INSIGHT 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.

 *

 * Authors:

 *    Rickard E. (Rik) Faith <faith@valinux.com>

 *

 */

#include <linux/config.h>

#include "drmP.h"

#include "gamma_drv.h"

#ifndef PCI_DEVICE_ID_3DLABS_GAMMA

#define PCI_DEVICE_ID_3DLABS_GAMMA 0x0008

#endif

#ifndef PCI_DEVICE_ID_3DLABS_MX

#define PCI_DEVICE_ID_3DLABS_MX 0x0006

#endif

#define GAMMA_NAME       "gamma"

#define GAMMA_DESC       "3dlabs GMX 2000"

#define GAMMA_DATE       "20000910"

#define GAMMA_MAJOR      1

#define GAMMA_MINOR      0

#define GAMMA_PATCHLEVEL 0

static drm_device_t           gamma_device;

static struct file_operations gamma_fops = {

#if LINUX_VERSION_CODE >= 0x020400

                                /* This started being used during 2.4.0-test */

        owner:   THIS_MODULE,

#endif

        open:    gamma_open,

        flush:   drm_flush,

        release: gamma_release,

        ioctl:   gamma_ioctl,

        mmap:    drm_mmap,

        read:    drm_read,

        fasync:  drm_fasync,

        poll:    drm_poll,

};

static struct miscdevice      gamma_misc = {

        minor: MISC_DYNAMIC_MINOR,

        name:  GAMMA_NAME,

        fops:  &gamma_fops,

};

static drm_ioctl_desc_t       gamma_ioctls[] = {

        [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]    = { gamma_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_busid,   0, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = { drm_setunique,   1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]      = { drm_block,       1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]    = { drm_unblock,     1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]    = { gamma_control,   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_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 },

        [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_DMA)]        = { gamma_dma,       1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]       = { gamma_lock,      1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]     = { gamma_unlock,    1, 0 },

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

};

#define GAMMA_IOCTL_COUNT DRM_ARRAY_SIZE(gamma_ioctls)

#ifdef MODULE

static char                   *gamma = NULL;

#endif

static int                    devices = 0;

MODULE_AUTHOR("VA Linux Systems, Inc.");

MODULE_DESCRIPTION("3dlabs GMX 2000");

MODULE_LICENSE("GPL and additional rights");

MODULE_PARM(gamma, "s");

MODULE_PARM(devices, "i");

MODULE_PARM_DESC(devices,

                 "devices=x, where x is the number of MX chips on card\n");

#ifndef MODULE

/* gamma_options is called by the kernel to parse command-line options

 * passed via the boot-loader (e.g., LILO).  It calls the insmod option

 * routine, drm_parse_options.

 */

static int __init gamma_options(char *str)

{

        drm_parse_options(str);

        return 1;

}

__setup("gamma=", gamma_options);

#endif

static int gamma_setup(drm_device_t *dev)

{

        int i;

        atomic_set(&dev->ioctl_count, 0);

        atomic_set(&dev->vma_count, 0);

        dev->buf_use      = 0;

        atomic_set(&dev->buf_alloc, 0);

        drm_dma_setup(dev);

        atomic_set(&dev->total_open, 0);

        atomic_set(&dev->total_close, 0);

        atomic_set(&dev->total_ioctl, 0);

        atomic_set(&dev->total_irq, 0);

        atomic_set(&dev->total_ctx, 0);

        atomic_set(&dev->total_locks, 0);

        atomic_set(&dev->total_unlocks, 0);

        atomic_set(&dev->total_contends, 0);

        atomic_set(&dev->total_sleeps, 0);

        for (i = 0; i < DRM_HASH_SIZE; i++) {

                dev->magiclist[i].head = NULL;

                dev->magiclist[i].tail = NULL;

        }

        dev->maplist        = NULL;

        dev->map_count      = 0;

        dev->vmalist        = NULL;

        dev->lock.hw_lock   = NULL;

        init_waitqueue_head(&dev->lock.lock_queue);

        dev->queue_count    = 0;

        dev->queue_reserved = 0;

        dev->queue_slots    = 0;

        dev->queuelist      = NULL;

        dev->irq            = 0;

        dev->context_flag   = 0;

        dev->interrupt_flag = 0;

        dev->dma_flag       = 0;

        dev->last_context   = 0;

        dev->last_switch    = 0;

        dev->last_checked   = 0;

        init_timer(&dev->timer);

        init_waitqueue_head(&dev->context_wait);

#if DRM_DMA_HISTO

        memset(&dev->histo, 0, sizeof(dev->histo));

#endif

        dev->ctx_start      = 0;

        dev->lck_start      = 0;

        dev->buf_rp       = dev->buf;

        dev->buf_wp       = dev->buf;

        dev->buf_end      = dev->buf + DRM_BSZ;

        dev->buf_async    = NULL;

        init_waitqueue_head(&dev->buf_readers);

        init_waitqueue_head(&dev->buf_writers);

        DRM_DEBUG("\n");

        /* The kernel's context could be created here, but is now created

           in drm_dma_enqueue.  This is more resource-efficient for

           hardware that does not do DMA, but may mean that

           drm_select_queue fails between the time the interrupt is

           initialized and the time the queues are initialized. */

        return 0;

}

static int gamma_takedown(drm_device_t *dev)

{

        int               i;

        drm_magic_entry_t *pt, *next;

        drm_map_t         *map;

        drm_vma_entry_t   *vma, *vma_next;

        DRM_DEBUG("\n");

        if (dev->irq) gamma_irq_uninstall(dev);

        down(&dev->struct_sem);

        del_timer(&dev->timer);

        if (dev->devname) {

                drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);

                dev->devname = NULL;

        }

        if (dev->unique) {

                drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);

                dev->unique = NULL;

                dev->unique_len = 0;

        }

                                /* 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 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;

        }

                                /* Clear map area and mtrr information */

        if (dev->maplist) {

                for (i = 0; i < dev->map_count; i++) {

                        map = dev->maplist[i];

                        switch (map->type) {

                        case _DRM_REGISTERS:

                        case _DRM_FRAME_BUFFER:

#ifdef CONFIG_MTRR

                                if (map->mtrr >= 0) {

                                        int retcode;

                                        retcode = mtrr_del(map->mtrr,

                                                           map->offset,

                                                           map->size);

                                        DRM_DEBUG("mtrr_del = %d\n", retcode);

                                }

#endif

                                drm_ioremapfree(map->handle, map->size, dev);

                                break;

                        case _DRM_SHM:

                                drm_free_pages((unsigned long)map->handle,

                                               drm_order(map->size)

                                               - PAGE_SHIFT,

                                               DRM_MEM_SAREA);

                                break;

                        case _DRM_AGP:

                                /* Do nothing here, because this is all

                                   handled in the AGP/GART driver. */

                                break;

                        }

                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);

                }

                drm_free(dev->maplist,

                         dev->map_count * sizeof(*dev->maplist),

                         DRM_MEM_MAPS);

                dev->maplist   = NULL;

                dev->map_count = 0;

        }

        if (dev->queuelist) {

                for (i = 0; i < dev->queue_count; i++) {

                        drm_waitlist_destroy(&dev->queuelist[i]->waitlist);

                        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;

        }

        drm_dma_takedown(dev);

        dev->queue_count     = 0;

        if (dev->lock.hw_lock) {

                dev->lock.hw_lock    = NULL; /* SHM removed */

                dev->lock.pid        = 0;

                wake_up_interruptible(&dev->lock.lock_queue);

        }

        up(&dev->struct_sem);

        return 0;

}

int gamma_found(void)

{

        return devices;

}

int gamma_find_devices(void)

{

        struct pci_dev *d = NULL, *one = NULL, *two = NULL;

        d = pci_find_device(PCI_VENDOR_ID_3DLABS,PCI_DEVICE_ID_3DLABS_GAMMA,d);

        if (!d) return 0;

        one = pci_find_device(PCI_VENDOR_ID_3DLABS,PCI_DEVICE_ID_3DLABS_MX,d);

        if (!one) return 0;

        /* Make sure it's on the same card, if not - no MX's found */

        if (PCI_SLOT(d->devfn) != PCI_SLOT(one->devfn)) return 0;

        two = pci_find_device(PCI_VENDOR_ID_3DLABS,PCI_DEVICE_ID_3DLABS_MX,one);

        if (!two) return 1;

        /* Make sure it's on the same card, if not - only 1 MX found */

        if (PCI_SLOT(d->devfn) != PCI_SLOT(two->devfn)) return 1;

        /* Two MX's found - we don't currently support more than 2 */

        return 2;

}

/* gamma_init is called via init_module at module load time, or via

 * linux/init/main.c (this is not currently supported). */

static int __init gamma_init(void)

{

        int                   retcode;

        drm_device_t          *dev = &gamma_device;

        DRM_DEBUG("\n");

        memset((void *)dev, 0, sizeof(*dev));

        dev->count_lock   = SPIN_LOCK_UNLOCKED;

        sema_init(&dev->struct_sem, 1);

#ifdef MODULE

        drm_parse_options(gamma);

#endif

        devices = gamma_find_devices();

        if (devices == 0) return -1;

        if ((retcode = misc_register(&gamma_misc))) {

                DRM_ERROR("Cannot register \"%s\"\n", GAMMA_NAME);

                return retcode;

        }

        dev->device = MKDEV(MISC_MAJOR, gamma_misc.minor);

        dev->name   = GAMMA_NAME;

        drm_mem_init();

        drm_proc_init(dev);

        DRM_INFO("Initialized %s %d.%d.%d %s on minor %d with %d MX devices\n",

                 GAMMA_NAME,

                 GAMMA_MAJOR,

                 GAMMA_MINOR,

                 GAMMA_PATCHLEVEL,

                 GAMMA_DATE,

                 gamma_misc.minor,

                 devices);

        return 0;

}

/* gamma_cleanup is called via cleanup_module at module unload time. */

static void __exit gamma_cleanup(void)

{

        drm_device_t          *dev = &gamma_device;

        DRM_DEBUG("\n");

        drm_proc_cleanup();

        if (misc_deregister(&gamma_misc)) {

                DRM_ERROR("Cannot unload module\n");

        } else {

                DRM_INFO("Module unloaded\n");

        }

        gamma_takedown(dev);

}

module_init(gamma_init);

module_exit(gamma_cleanup);

int gamma_version(struct inode *inode, struct file *filp, unsigned int cmd,

                  unsigned long arg)

{

        drm_version_t version;

        int           len;

        if (copy_from_user(&version,

                           (drm_version_t *)arg,

                           sizeof(version)))

                return -EFAULT;

#define DRM_COPY(name,value)                                 \

        len = strlen(value);                                 \

        if (len > name##_len) len = name##_len;              \

        name##_len = strlen(value);                          \

        if (len && name) {                                   \

                if (copy_to_user(name, value, len))          \

                        return -EFAULT;                      \

        }

        version.version_major      = GAMMA_MAJOR;

        version.version_minor      = GAMMA_MINOR;

        version.version_patchlevel = GAMMA_PATCHLEVEL;

        DRM_COPY(version.name, GAMMA_NAME);

        DRM_COPY(version.date, GAMMA_DATE);

        DRM_COPY(version.desc, GAMMA_DESC);

        if (copy_to_user((drm_version_t *)arg,

                         &version,

                         sizeof(version)))

                return -EFAULT;

        return 0;

}

int gamma_open(struct inode *inode, struct file *filp)

{

        drm_device_t  *dev    = &gamma_device;

        int           retcode = 0;

        DRM_DEBUG("open_count = %d\n", dev->open_count);

        if (!(retcode = drm_open_helper(inode, filp, dev))) {

#if LINUX_VERSION_CODE < 0x020333

                MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */

#endif

                atomic_inc(&dev->total_open);

                spin_lock(&dev->count_lock);

                if (!dev->open_count++) {

                        spin_unlock(&dev->count_lock);

                        return gamma_setup(dev);

                }

                spin_unlock(&dev->count_lock);

        }

        return retcode;

}

int gamma_release(struct inode *inode, struct file *filp)

{

        drm_file_t    *priv   = filp->private_data;

        drm_device_t  *dev;

        int           retcode = 0;

        lock_kernel();

        dev = priv->dev;

        DRM_DEBUG("open_count = %d\n", dev->open_count);

        if (!(retcode = drm_release(inode, filp))) {

#if LINUX_VERSION_CODE < 0x020333

                MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */

#endif

                atomic_inc(&dev->total_close);

                spin_lock(&dev->count_lock);

                if (!--dev->open_count) {

                        if (atomic_read(&dev->ioctl_count) || dev->blocked) {

                                DRM_ERROR("Device busy: %d %d\n",

                                          atomic_read(&dev->ioctl_count),

                                          dev->blocked);

                                spin_unlock(&dev->count_lock);

                                unlock_kernel();

                                return -EBUSY;

                        }

                        spin_unlock(&dev->count_lock);

                        unlock_kernel();

                        return gamma_takedown(dev);

                }

                spin_unlock(&dev->count_lock);

        }

        unlock_kernel();

        return retcode;

}

/* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */

int gamma_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,

                unsigned long arg)

{

        int              nr      = DRM_IOCTL_NR(cmd);

        drm_file_t       *priv   = filp->private_data;

        drm_device_t     *dev    = priv->dev;

        int              retcode = 0;

        drm_ioctl_desc_t *ioctl;

        drm_ioctl_t      *func;

        atomic_inc(&dev->ioctl_count);

        atomic_inc(&dev->total_ioctl);

        ++priv->ioctl_count;

        DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",

                  current->pid, cmd, nr, dev->device, priv->authenticated);

        if (nr >= GAMMA_IOCTL_COUNT) {

                retcode = -EINVAL;

        } else {

                ioctl     = &gamma_ioctls[nr];

                func      = ioctl->func;

                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);

                }

        }

        atomic_dec(&dev->ioctl_count);

        return retcode;

}

int gamma_unlock(struct inode *inode, struct file *filp, unsigned int cmd,

                 unsigned long arg)

{

        drm_file_t        *priv   = filp->private_data;

        drm_device_t      *dev    = priv->dev;

        drm_lock_t        lock;

        if (copy_from_user(&lock, (drm_lock_t *)arg, sizeof(lock)))

                return -EFAULT;

        if (lock.context == DRM_KERNEL_CONTEXT) {

                DRM_ERROR("Process %d using kernel context %d\n",

                          current->pid, lock.context);

                return -EINVAL;

        }

        DRM_DEBUG("%d frees lock (%d holds)\n",

                  lock.context,

                  _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

        atomic_inc(&dev->total_unlocks);

        if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))

                atomic_inc(&dev->total_contends);

        drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);

        gamma_dma_schedule(dev, 1);

        if (!dev->context_flag) {

                if (drm_lock_free(dev, &dev->lock.hw_lock->lock,

                                  DRM_KERNEL_CONTEXT)) {

                        DRM_ERROR("\n");

                }

        }

#if DRM_DMA_HISTOGRAM

        atomic_inc(&dev->histo.lhld[drm_histogram_slot(get_cycles()

                                                       - dev->lck_start)]);

#endif

        unblock_all_signals();

        return 0;

}