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/* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-

 * Created: Fri Nov 24 18:31:37 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.

 *

 * Authors:

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

 *    Gareth Hughes <gareth@valinux.com>

 * ChangeLog:

 *  2001-11-16  Torsten Duwe <duwe@caldera.de>

 *              added context constructor/destructor hooks,

 *              needed by SiS driver's memory management.

 */

#include "drmP.h"

#if __HAVE_CTX_BITMAP

/* ================================================================

 * Context bitmap support

 */

void DRM(ctxbitmap_free)( drm_device_t *dev, int ctx_handle )

{

        if ( ctx_handle < 0 ) goto failed;

        if ( !dev->ctx_bitmap ) goto failed;

        if ( ctx_handle < DRM_MAX_CTXBITMAP ) {

                down(&dev->struct_sem);

                clear_bit( ctx_handle, dev->ctx_bitmap );

                dev->context_sareas[ctx_handle] = NULL;

                up(&dev->struct_sem);

                return;

        }

failed:

        DRM_ERROR( "Attempt to free invalid context handle: %d\n",

                   ctx_handle );

        return;

}

int DRM(ctxbitmap_next)( drm_device_t *dev )

{

        int bit;

        if(!dev->ctx_bitmap) return -1;

        down(&dev->struct_sem);

        bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );

        if ( bit < DRM_MAX_CTXBITMAP ) {

                set_bit( bit, dev->ctx_bitmap );

                DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit );

                if((bit+1) > dev->max_context) {

                        dev->max_context = (bit+1);

                        if(dev->context_sareas) {

                                drm_map_t **ctx_sareas;

                                ctx_sareas = DRM(realloc)(dev->context_sareas,

                                                (dev->max_context - 1) *

                                                sizeof(*dev->context_sareas),

                                                dev->max_context *

                                                sizeof(*dev->context_sareas),

                                                DRM_MEM_MAPS);

                                if(!ctx_sareas) {

                                        clear_bit(bit, dev->ctx_bitmap);

                                        up(&dev->struct_sem);

                                        return -1;

                                }

                                dev->context_sareas = ctx_sareas;

                                dev->context_sareas[bit] = NULL;

                        } else {

                                /* max_context == 1 at this point */

                                dev->context_sareas = DRM(alloc)(

                                                dev->max_context *

                                                sizeof(*dev->context_sareas),

                                                DRM_MEM_MAPS);

                                if(!dev->context_sareas) {

                                        clear_bit(bit, dev->ctx_bitmap);

                                        up(&dev->struct_sem);

                                        return -1;

                                }

                                dev->context_sareas[bit] = NULL;

                        }

                }

                up(&dev->struct_sem);

                return bit;

        }

        up(&dev->struct_sem);

        return -1;

}

int DRM(ctxbitmap_init)( drm_device_t *dev )

{

        int i;

        int temp;

        down(&dev->struct_sem);

        dev->ctx_bitmap = (unsigned long *) DRM(alloc)( PAGE_SIZE,

                                                        DRM_MEM_CTXBITMAP );

        if ( dev->ctx_bitmap == NULL ) {

                up(&dev->struct_sem);

                return -ENOMEM;

        }

        memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );

        dev->context_sareas = NULL;

        dev->max_context = -1;

        up(&dev->struct_sem);

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

                temp = DRM(ctxbitmap_next)( dev );

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

        }

        return 0;

}

void DRM(ctxbitmap_cleanup)( drm_device_t *dev )

{

        down(&dev->struct_sem);

        if( dev->context_sareas ) DRM(free)( dev->context_sareas,

                                             sizeof(*dev->context_sareas) *

                                             dev->max_context,

                                             DRM_MEM_MAPS );

        DRM(free)( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP );

        up(&dev->struct_sem);

}

/* ================================================================

 * Per Context SAREA Support

 */

int DRM(getsareactx)(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_priv_map_t request;

        drm_map_t *map;

        if (copy_from_user(&request,

                           (drm_ctx_priv_map_t *)arg,

                           sizeof(request)))

                return -EFAULT;

        down(&dev->struct_sem);

        if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {

                up(&dev->struct_sem);

                return -EINVAL;

        }

        map = dev->context_sareas[request.ctx_id];

        up(&dev->struct_sem);

        request.handle = map->handle;

        if (copy_to_user((drm_ctx_priv_map_t *)arg, &request, sizeof(request)))

                return -EFAULT;

        return 0;

}

int DRM(setsareactx)(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_priv_map_t request;

        drm_map_t *map = NULL;

        drm_map_list_t *r_list = NULL;

        struct list_head *list;

        if (copy_from_user(&request,

                           (drm_ctx_priv_map_t *)arg,

                           sizeof(request)))

                return -EFAULT;

        down(&dev->struct_sem);

        list_for_each(list, &dev->maplist->head) {

                r_list = (drm_map_list_t *)list;

                if(r_list->map &&

                   r_list->map->handle == request.handle)

                        goto found;

        }

bad:

        up(&dev->struct_sem);

        return -EINVAL;

found:

        map = r_list->map;

        if (!map) goto bad;

        if (dev->max_context < 0)

                goto bad;

        if (request.ctx_id >= (unsigned) dev->max_context)

                goto bad;

        dev->context_sareas[request.ctx_id] = map;

        up(&dev->struct_sem);

        return 0;

}

/* ================================================================

 * The actual DRM context handling routines

 */

int DRM(context_switch)( drm_device_t *dev, int old, int new )

{

        char buf[64];

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

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

                return -EBUSY;

        }

#if __HAVE_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 ) {

                DRM(context_switch_complete)( dev, new );

        } else {

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

                DRM(write_string)( dev, buf );

        }

        return 0;

}

int DRM(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 __HAVE_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 DRM(resctx)( struct inode *inode, struct file *filp,

                 unsigned int cmd, unsigned long arg )

{

        drm_ctx_res_t res;

        drm_ctx_t ctx;

        int i;

        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 DRM(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;

        ctx.handle = DRM(ctxbitmap_next)( dev );

        if ( ctx.handle == DRM_KERNEL_CONTEXT ) {

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

                ctx.handle = DRM(ctxbitmap_next)( dev );

        }

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

        if ( ctx.handle == -1 ) {

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

                                /* Should this return -EBUSY instead? */

                return -ENOMEM;

        }

#ifdef DRIVER_CTX_CTOR

        if ( ctx.handle != DRM_KERNEL_CONTEXT )

                DRIVER_CTX_CTOR(ctx.handle); /* XXX: also pass dev ? */

#endif

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

                return -EFAULT;

        return 0;

}

int DRM(modctx)( struct inode *inode, struct file *filp,

                 unsigned int cmd, unsigned long arg )

{

        /* This does nothing */

        return 0;

}

int DRM(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 handle any context flags */

        ctx.flags = 0;

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

                return -EFAULT;

        return 0;

}

int DRM(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 DRM(context_switch)( dev, dev->last_context, ctx.handle );

}

int DRM(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 );

        DRM(context_switch_complete)( dev, ctx.handle );

        return 0;

}

int DRM(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 + 1 ) {

                priv->remove_auth_on_close = 1;

        }

        if ( ctx.handle != DRM_KERNEL_CONTEXT ) {

#ifdef DRIVER_CTX_DTOR

                DRIVER_CTX_DTOR(ctx.handle); /* XXX: also pass dev ? */

#endif

                DRM(ctxbitmap_free)( dev, ctx.handle );

        }

        return 0;

}

#else /* __HAVE_CTX_BITMAP */

/* ================================================================

 * Old-style context support

 */

int DRM(context_switch)(drm_device_t *dev, int old, int new)

{

        char        buf[64];

        drm_queue_t *q;

#if 0

        atomic_inc(&dev->total_ctx);

#endif

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

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

                return -EBUSY;

        }

#if __HAVE_DMA_HISTOGRAM

        dev->ctx_start = get_cycles();

#endif

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

        if (new >= dev->queue_count) {

                clear_bit(0, &dev->context_flag);

                return -EINVAL;

        }

        if (new == dev->last_context) {

                clear_bit(0, &dev->context_flag);

                return 0;

        }

        q = dev->queuelist[new];

        atomic_inc(&q->use_count);

        if (atomic_read(&q->use_count) == 1) {

                atomic_dec(&q->use_count);

                clear_bit(0, &dev->context_flag);

                return -EINVAL;

        }

        if (DRM(flags) & DRM_FLAG_NOCTX) {

                DRM(context_switch_complete)(dev, new);

        } else {

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

                DRM(write_string)(dev, buf);

        }

        atomic_dec(&q->use_count);

        return 0;

}

int DRM(context_switch_complete)(drm_device_t *dev, int new)

{

        drm_device_dma_t *dma = dev->dma;

        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 (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {

                if (DRM(lock_free)(dev, &dev->lock.hw_lock->lock,

                                  DRM_KERNEL_CONTEXT)) {

                        DRM_ERROR("Cannot free lock\n");

                }

        }

#if __HAVE_DMA_HISTOGRAM

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

                                                      - dev->ctx_start)]);

#endif

        clear_bit(0, &dev->context_flag);

        wake_up_interruptible(&dev->context_wait);

        return 0;

}

static int DRM(init_queue)(drm_device_t *dev, drm_queue_t *q, drm_ctx_t *ctx)

{

        DRM_DEBUG("\n");

        if (atomic_read(&q->use_count) != 1

            || atomic_read(&q->finalization)

            || atomic_read(&q->block_count)) {

                DRM_ERROR("New queue is already in use: u%d f%d b%d\n",

                          atomic_read(&q->use_count),

                          atomic_read(&q->finalization),

                          atomic_read(&q->block_count));

        }

        atomic_set(&q->finalization,  0);

        atomic_set(&q->block_count,   0);

        atomic_set(&q->block_read,    0);

        atomic_set(&q->block_write,   0);

        atomic_set(&q->total_queued,  0);

        atomic_set(&q->total_flushed, 0);

        atomic_set(&q->total_locks,   0);

        init_waitqueue_head(&q->write_queue);

        init_waitqueue_head(&q->read_queue);

        init_waitqueue_head(&q->flush_queue);

        q->flags = ctx->flags;

        DRM(waitlist_create)(&q->waitlist, dev->dma->buf_count);

        return 0;

}

/* drm_alloc_queue:

PRE: 1) dev->queuelist[0..dev->queue_count] is allocated and will not

        disappear (so all deallocation must be done after IOCTLs are off)

     2) dev->queue_count < dev->queue_slots

     3) dev->queuelist[i].use_count == 0 and

        dev->queuelist[i].finalization == 0 if i not in use

POST: 1) dev->queuelist[i].use_count == 1

      2) dev->queue_count < dev->queue_slots */

static int DRM(alloc_queue)(drm_device_t *dev)

{

        int         i;

        drm_queue_t *queue;

        int         oldslots;

        int         newslots;

                                /* Check for a free queue */

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

                atomic_inc(&dev->queuelist[i]->use_count);

                if (atomic_read(&dev->queuelist[i]->use_count) == 1

                    && !atomic_read(&dev->queuelist[i]->finalization)) {

                        DRM_DEBUG("%d (free)\n", i);

                        return i;

                }

                atomic_dec(&dev->queuelist[i]->use_count);

        }

                                /* Allocate a new queue */

        down(&dev->struct_sem);

        queue = DRM(alloc)(sizeof(*queue), DRM_MEM_QUEUES);

        memset(queue, 0, sizeof(*queue));

        atomic_set(&queue->use_count, 1);

        ++dev->queue_count;

        if (dev->queue_count >= dev->queue_slots) {

                oldslots = dev->queue_slots * sizeof(*dev->queuelist);

                if (!dev->queue_slots) dev->queue_slots = 1;

                dev->queue_slots *= 2;

                newslots = dev->queue_slots * sizeof(*dev->queuelist);

                dev->queuelist = DRM(realloc)(dev->queuelist,

                                              oldslots,

                                              newslots,

                                              DRM_MEM_QUEUES);

                if (!dev->queuelist) {

                        up(&dev->struct_sem);

                        DRM_DEBUG("out of memory\n");

                        return -ENOMEM;

                }

        }

        dev->queuelist[dev->queue_count-1] = queue;

        up(&dev->struct_sem);

        DRM_DEBUG("%d (new)\n", dev->queue_count - 1);

        return dev->queue_count - 1;

}

int DRM(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 DRM(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 = DRM(alloc_queue)(dev)) == DRM_KERNEL_CONTEXT) {

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

                DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);

                ctx.handle = DRM(alloc_queue)(dev);

        }

        DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);

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