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/* i810_context.c -- IOCTLs for i810 contexts -*- linux-c -*-

 * Created: Mon Dec 13 09:51:35 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>

 *          Jeff Hartmann <jhartmann@valinux.com>

 *

 */

#define __NO_VERSION__

#include "drmP.h"

#include "i810_drv.h"

static int i810_alloc_queue(drm_device_t *dev)

{

        int temp = drm_ctxbitmap_next(dev);

        DRM_DEBUG("i810_alloc_queue: %d\n", temp);

        return temp;

}

int i810_context_switch(drm_device_t *dev, int old, int new)

{

        char        buf[64];

        atomic_inc(&dev->total_ctx);

        if (test_and_set_bit(0, &dev->context_flag)) {

                DRM_ERROR("Reentering -- FIXME\n");

                return -EBUSY;

        }

#if DRM_DMA_HISTOGRAM

        dev->ctx_start = get_cycles();

#endif

        DRM_DEBUG("Context switch from %d to %d\n", old, new);

        if (new == dev->last_context) {

                clear_bit(0, &dev->context_flag);

                return 0;

        }

        if (drm_flags & DRM_FLAG_NOCTX) {

                i810_context_switch_complete(dev, new);

        } else {

                sprintf(buf, "C %d %d\n", old, new);

                drm_write_string(dev, buf);

        }

        return 0;

}

int i810_context_switch_complete(drm_device_t *dev, int new)

{

        dev->last_context = new;  /* PRE/POST: This is the _only_ writer. */

        dev->last_switch  = jiffies;

        if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {

                DRM_ERROR("Lock isn't held after context switch\n");

        }

                                /* If a context switch is ever initiated

                                   when the kernel holds the lock, release

                                   that lock here. */

#if DRM_DMA_HISTOGRAM

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

                                                      - dev->ctx_start)]);

#endif

        clear_bit(0, &dev->context_flag);

        wake_up(&dev->context_wait);

        return 0;

}

int i810_resctx(struct inode *inode, struct file *filp, unsigned int cmd,

               unsigned long arg)

{

        drm_ctx_res_t   res;

        drm_ctx_t       ctx;

        int             i;

        DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);

        if (copy_from_user(&res, (drm_ctx_res_t *)arg, sizeof(res)))

                return -EFAULT;

        if (res.count >= DRM_RESERVED_CONTEXTS) {

                memset(&ctx, 0, sizeof(ctx));

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

                        ctx.handle = i;

                        if (copy_to_user(&res.contexts[i],

                                         &i,

                                         sizeof(i)))

                                return -EFAULT;

                }

        }

        res.count = DRM_RESERVED_CONTEXTS;

        if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))

                return -EFAULT;

        return 0;

}

int i810_addctx(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_ctx_t       ctx;

        if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))

                return -EFAULT;

        if ((ctx.handle = i810_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {

                                /* Skip kernel's context and get a new one. */

                ctx.handle = i810_alloc_queue(dev);

        }

        if (ctx.handle == -1) {

                DRM_DEBUG("Not enough free contexts.\n");

                                /* Should this return -EBUSY instead? */

                return -ENOMEM;

        }

        DRM_DEBUG("%d\n", ctx.handle);

        if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))

                return -EFAULT;

        return 0;

}

int i810_modctx(struct inode *inode, struct file *filp, unsigned int cmd,

        unsigned long arg)

{

        /* This does nothing for the i810 */

        return 0;

}

int i810_getctx(struct inode *inode, struct file *filp, unsigned int cmd,

        unsigned long arg)

{

        drm_ctx_t ctx;

        if (copy_from_user(&ctx, (drm_ctx_t*)arg, sizeof(ctx)))

                return -EFAULT;

        /* This is 0, because we don't hanlde any context flags */

        ctx.flags = 0;

        if (copy_to_user((drm_ctx_t*)arg, &ctx, sizeof(ctx)))

                return -EFAULT;

        return 0;

}

int i810_switchctx(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_ctx_t       ctx;

        if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))

                return -EFAULT;

        DRM_DEBUG("%d\n", ctx.handle);

        return i810_context_switch(dev, dev->last_context, ctx.handle);

}

int i810_newctx(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_ctx_t       ctx;

        if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))

                return -EFAULT;

        DRM_DEBUG("%d\n", ctx.handle);

        i810_context_switch_complete(dev, ctx.handle);

        return 0;

}

int i810_rmctx(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_ctx_t       ctx;

        if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))

                return -EFAULT;

        DRM_DEBUG("%d\n", ctx.handle);

        if(ctx.handle != DRM_KERNEL_CONTEXT) {

                drm_ctxbitmap_free(dev, ctx.handle);

        }

        return 0;

}