/* 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 * Gareth Hughes * $FreeBSD: src/sys/dev/drm/drm_context.h,v 1.4.2.1 2003/04/26 07:05:28 anholt Exp $ * $DragonFly: src/sys/dev/drm/Attic/drm_context.h,v 1.2 2003/06/17 04:28:24 dillon Exp $ */ #include "dev/drm/drmP.h" #if !__HAVE_CTX_BITMAP #error "__HAVE_CTX_BITMAP must be defined" #endif /* ================================================================ * 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_LOCK; clear_bit( ctx_handle, dev->ctx_bitmap ); dev->context_sareas[ctx_handle] = NULL; DRM_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_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_local_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_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_UNLOCK; return -1; } dev->context_sareas[bit] = NULL; } } DRM_UNLOCK; return bit; } DRM_UNLOCK; return -1; } int DRM(ctxbitmap_init)( drm_device_t *dev ) { int i; int temp; DRM_LOCK; dev->ctx_bitmap = (atomic_t *) DRM(alloc)( PAGE_SIZE, DRM_MEM_CTXBITMAP ); if ( dev->ctx_bitmap == NULL ) { DRM_UNLOCK; return DRM_ERR(ENOMEM); } memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE ); dev->context_sareas = NULL; dev->max_context = -1; DRM_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_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_UNLOCK; } /* ================================================================ * Per Context SAREA Support */ int DRM(getsareactx)( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_ctx_priv_map_t request; drm_local_map_t *map; DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data, sizeof(request) ); DRM_LOCK; if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) { DRM_UNLOCK; return DRM_ERR(EINVAL); } map = dev->context_sareas[request.ctx_id]; DRM_UNLOCK; request.handle = map->handle; DRM_COPY_TO_USER_IOCTL( (drm_ctx_priv_map_t *)data, request, sizeof(request) ); return 0; } int DRM(setsareactx)( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_ctx_priv_map_t request; drm_local_map_t *map = NULL; drm_map_list_entry_t *list; DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data, sizeof(request) ); DRM_LOCK; TAILQ_FOREACH(list, dev->maplist, link) { map=list->map; if(map->handle == request.handle) { 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_UNLOCK; return 0; } } bad: DRM_UNLOCK; return DRM_ERR(EINVAL); } /* ================================================================ * The actual DRM context handling routines */ int DRM(context_switch)( drm_device_t *dev, int old, int new ) { if ( test_and_set_bit( 0, &dev->context_flag ) ) { DRM_ERROR( "Reentering -- FIXME\n" ); return DRM_ERR(EBUSY); } DRM_DEBUG( "Context switch from %d to %d\n", old, new ); if ( new == dev->last_context ) { clear_bit( 0, &dev->context_flag ); return 0; } return 0; } int DRM(context_switch_complete)( drm_device_t *dev, int new ) { dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ 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. */ clear_bit( 0, &dev->context_flag ); return 0; } int DRM(resctx)( DRM_IOCTL_ARGS ) { drm_ctx_res_t res; drm_ctx_t ctx; int i; DRM_COPY_FROM_USER_IOCTL( 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_COPY_TO_USER( &res.contexts[i], &i, sizeof(i) ) ) return DRM_ERR(EFAULT); } } res.count = DRM_RESERVED_CONTEXTS; DRM_COPY_TO_USER_IOCTL( (drm_ctx_res_t *)data, res, sizeof(res) ); return 0; } int DRM(addctx)( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_ctx_t ctx; DRM_COPY_FROM_USER_IOCTL( 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? */ return DRM_ERR(ENOMEM); } DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) ); return 0; } int DRM(modctx)( DRM_IOCTL_ARGS ) { /* This does nothing */ return 0; } int DRM(getctx)( DRM_IOCTL_ARGS ) { drm_ctx_t ctx; DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) ); /* This is 0, because we don't handle any context flags */ ctx.flags = 0; DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) ); return 0; } int DRM(switchctx)( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_ctx_t ctx; DRM_COPY_FROM_USER_IOCTL( 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_IOCTL_ARGS ) { DRM_DEVICE; drm_ctx_t ctx; DRM_COPY_FROM_USER_IOCTL( 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_IOCTL_ARGS ) { DRM_DEVICE; drm_ctx_t ctx; DRM_COPY_FROM_USER_IOCTL( 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; }