diff options
Diffstat (limited to 'bsd-core/drm_context.c')
| -rw-r--r-- | bsd-core/drm_context.c | 730 |
1 files changed, 730 insertions, 0 deletions
diff --git a/bsd-core/drm_context.c b/bsd-core/drm_context.c new file mode 100644 index 00000000..8d676a23 --- /dev/null +++ b/bsd-core/drm_context.c @@ -0,0 +1,730 @@ +/* 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 */ |