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drm/bsd/drm_context.h

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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>
*/
#define __NO_VERSION__
#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 ) {
DRM_OS_LOCK;
clear_bit( ctx_handle, dev->ctx_bitmap );
dev->context_sareas[ctx_handle] = NULL;
DRM_OS_UNLOCK;
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;
DRM_OS_LOCK;
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);
DRM_OS_UNLOCK;
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);
DRM_OS_UNLOCK;
return -1;
}
dev->context_sareas[bit] = NULL;
}
}
DRM_OS_UNLOCK;
return bit;
}
DRM_OS_UNLOCK;
return -1;
}
int DRM(ctxbitmap_init)( drm_device_t *dev )
{
int i;
int temp;
DRM_OS_LOCK;
dev->ctx_bitmap = (unsigned long *) DRM(alloc)( PAGE_SIZE,
DRM_MEM_CTXBITMAP );
if ( dev->ctx_bitmap == NULL ) {
DRM_OS_UNLOCK;
DRM_OS_RETURN(ENOMEM);
}
memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );
dev->context_sareas = NULL;
dev->max_context = -1;
DRM_OS_UNLOCK;
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 )
{
DRM_OS_LOCK;
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 );
DRM_OS_UNLOCK;
}
/* ================================================================
* Per Context SAREA Support
*/
int DRM(getsareactx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_priv_map_t request;
drm_map_t *map;
DRM_OS_KRNFROMUSR( request, (drm_ctx_priv_map_t *)data,
sizeof(request) );
DRM_OS_LOCK;
if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
DRM_OS_UNLOCK;
DRM_OS_RETURN(EINVAL);
}
map = dev->context_sareas[request.ctx_id];
DRM_OS_UNLOCK;
request.handle = map->handle;
DRM_OS_KRNTOUSR( (drm_ctx_priv_map_t *)data, request, sizeof(request) );
return 0;
}
int DRM(setsareactx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_priv_map_t request;
drm_map_t *map = NULL;
drm_map_list_entry_t *list;
DRM_OS_KRNFROMUSR( request, (drm_ctx_priv_map_t *)data,
sizeof(request) );
DRM_OS_LOCK;
TAILQ_FOREACH(list, dev->maplist, link) {
map=list->map;
if(map->handle == request.handle)
goto found;
}
bad:
DRM_OS_UNLOCK;
return -EINVAL;
found:
map = 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;
DRM_OS_UNLOCK;
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" );
DRM_OS_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 );
DRM_OS_WAKEUP( &dev->context_wait );
return 0;
}
int DRM(resctx)( DRM_OS_IOCTL )
{
drm_ctx_res_t res;
drm_ctx_t ctx;
int i;
DRM_OS_KRNFROMUSR( res, (drm_ctx_res_t *)data, sizeof(res) );
if ( res.count >= DRM_RESERVED_CONTEXTS ) {
memset( &ctx, 0, sizeof(ctx) );
for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
ctx.handle = i;
if ( DRM_OS_COPYTOUSR( &res.contexts[i],
&i, sizeof(i) ) )
DRM_OS_RETURN(EFAULT);
}
}
res.count = DRM_RESERVED_CONTEXTS;
DRM_OS_KRNTOUSR( (drm_ctx_res_t *)data, res, sizeof(res) );
return 0;
}
int DRM(addctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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? */
DRM_OS_RETURN(ENOMEM);
}
DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
return 0;
}
int DRM(modctx)( DRM_OS_IOCTL )
{
/* This does nothing */
return 0;
}
int DRM(getctx)( DRM_OS_IOCTL )
{
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
/* This is 0, because we don't handle any context flags */
ctx.flags = 0;
DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
return 0;
}
int DRM(switchctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG( "%d\n", ctx.handle );
return DRM(context_switch)( dev, dev->last_context, ctx.handle );
}
int DRM(newctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG( "%d\n", ctx.handle );
DRM(context_switch_complete)( dev, ctx.handle );
return 0;
}
int DRM(rmctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG( "%d\n", ctx.handle );
if ( ctx.handle != DRM_KERNEL_CONTEXT ) {
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");
DRM_OS_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);
DRM_OS_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);
DRM_OS_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);
DRM_OS_WAKEUP_INT(&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%ld f%ld b%ld\n",
(unsigned long)atomic_read(&q->use_count),
(unsigned long)atomic_read(&q->finalization),
(unsigned long)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);
q->write_queue = 0;
q->read_queue = 0;
q->flush_queue = 0;
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 */
DRM_OS_LOCK;
queue = gamma_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) {
DRM_OS_UNLOCK;
DRM_DEBUG("out of memory\n");
DRM_OS_RETURN(ENOMEM);
}
}
dev->queuelist[dev->queue_count-1] = queue;
DRM_OS_UNLOCK;
DRM_DEBUG("%d (new)\n", dev->queue_count - 1);
return dev->queue_count - 1;
}
int DRM(resctx)( DRM_OS_IOCTL )
{
drm_ctx_res_t res;
drm_ctx_t ctx;
int i;
DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
DRM_OS_KRNFROMUSR( res, (drm_ctx_res_t *)data, sizeof(res) );
if (res.count >= DRM_RESERVED_CONTEXTS) {
memset(&ctx, 0, sizeof(ctx));
for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
ctx.handle = i;
if (DRM_OS_COPYTOUSR(&res.contexts[i],
&i,
sizeof(i)))
DRM_OS_RETURN(EFAULT);
}
}
res.count = DRM_RESERVED_CONTEXTS;
DRM_OS_KRNTOUSR( (drm_ctx_res_t *)data, res, sizeof(res) );
return 0;
}
int DRM(addctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
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);
DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
return 0;
}
int DRM(modctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
drm_queue_t *q;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG("%d\n", ctx.handle);
if (ctx.handle < 0 || ctx.handle >= dev->queue_count)
DRM_OS_RETURN(EINVAL);
q = dev->queuelist[ctx.handle];
atomic_inc(&q->use_count);
if (atomic_read(&q->use_count) == 1) {
/* No longer in use */
atomic_dec(&q->use_count);
DRM_OS_RETURN(EINVAL);
}
if (DRM_BUFCOUNT(&q->waitlist)) {
atomic_dec(&q->use_count);
DRM_OS_RETURN(EBUSY);
}
q->flags = ctx.flags;
atomic_dec(&q->use_count);
return 0;
}
int DRM(getctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
drm_queue_t *q;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG("%d\n", ctx.handle);
if (ctx.handle >= dev->queue_count)
DRM_OS_RETURN(EINVAL);
q = dev->queuelist[ctx.handle];
atomic_inc(&q->use_count);
if (atomic_read(&q->use_count) == 1) {
/* No longer in use */
atomic_dec(&q->use_count);
DRM_OS_RETURN(EINVAL);
}
ctx.flags = q->flags;
atomic_dec(&q->use_count);
DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
return 0;
}
int DRM(switchctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG("%d\n", ctx.handle);
return DRM(context_switch)(dev, dev->last_context, ctx.handle);
}
int DRM(newctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG("%d\n", ctx.handle);
DRM(context_switch_complete)(dev, ctx.handle);
return 0;
}
int DRM(rmctx)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_ctx_t ctx;
drm_queue_t *q;
drm_buf_t *buf;
DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
DRM_DEBUG("%d\n", ctx.handle);
if (ctx.handle >= dev->queue_count) DRM_OS_RETURN(EINVAL);
q = dev->queuelist[ctx.handle];
atomic_inc(&q->use_count);
if (atomic_read(&q->use_count) == 1) {
/* No longer in use */
atomic_dec(&q->use_count);
DRM_OS_RETURN(EINVAL);
}
atomic_inc(&q->finalization); /* Mark queue in finalization state */
atomic_sub(2, &q->use_count); /* Mark queue as unused (pending
finalization) */
while (test_and_set_bit(0, &dev->interrupt_flag)) {
static int never;
int retcode;
retcode = tsleep(&never, PZERO|PCATCH, "never", 1);
if (retcode)
return retcode;
}
/* Remove queued buffers */
while ((buf = DRM(waitlist_get)(&q->waitlist))) {
DRM(free_buffer)(dev, buf);
}
clear_bit(0, &dev->interrupt_flag);
/* Wakeup blocked processes */
wakeup( &q->block_read );
wakeup( &q->block_write );
DRM_OS_WAKEUP_INT( &q->flush_queue );
/* Finalization over. Queue is made
available when both use_count and
finalization become 0, which won't
happen until all the waiting processes
stop waiting. */
atomic_dec(&q->finalization);
return 0;
}
#endif /* __HAVE_CTX_BITMAP */
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