| /* 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> |
| * |
| */ |
| |
| #include "drmP.h" |
| |
| /* ================================================================ |
| * Context bitmap support |
| */ |
| |
| void drm_ctxbitmap_free(drm_device_t *dev, int ctx_handle) |
| { |
| if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP || |
| dev->ctx_bitmap == NULL) { |
| DRM_ERROR("Attempt to free invalid context handle: %d\n", |
| ctx_handle); |
| return; |
| } |
| |
| DRM_LOCK(); |
| clear_bit(ctx_handle, dev->ctx_bitmap); |
| dev->context_sareas[ctx_handle] = NULL; |
| DRM_UNLOCK(); |
| return; |
| } |
| |
| int drm_ctxbitmap_next(drm_device_t *dev) |
| { |
| int bit; |
| |
| if (dev->ctx_bitmap == NULL) |
| return -1; |
| |
| DRM_LOCK(); |
| bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP ); |
| if (bit >= DRM_MAX_CTXBITMAP) { |
| DRM_UNLOCK(); |
| return -1; |
| } |
| |
| 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 != NULL) { |
| drm_local_map_t **ctx_sareas; |
| |
| ctx_sareas = realloc(dev->context_sareas, |
| dev->max_context * sizeof(*dev->context_sareas), |
| M_DRM, M_NOWAIT); |
| if (ctx_sareas == NULL) { |
| 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 = malloc(dev->max_context * |
| sizeof(*dev->context_sareas), M_DRM, M_NOWAIT); |
| if (dev->context_sareas == NULL) { |
| clear_bit(bit, dev->ctx_bitmap); |
| DRM_UNLOCK(); |
| return -1; |
| } |
| dev->context_sareas[bit] = NULL; |
| } |
| } |
| DRM_UNLOCK(); |
| return bit; |
| } |
| |
| int drm_ctxbitmap_init(drm_device_t *dev) |
| { |
| int i; |
| int temp; |
| |
| DRM_LOCK(); |
| dev->ctx_bitmap = malloc(PAGE_SIZE, M_DRM, M_NOWAIT | M_ZERO); |
| if ( dev->ctx_bitmap == NULL ) { |
| DRM_UNLOCK(); |
| return DRM_ERR(ENOMEM); |
| } |
| 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 != NULL) |
| free(dev->context_sareas, M_DRM); |
| free(dev->ctx_bitmap, M_DRM); |
| 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_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data, |
| sizeof(request) ); |
| |
| DRM_LOCK(); |
| TAILQ_FOREACH(map, &dev->maplist, link) { |
| 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 ) { |
| bzero(&ctx, sizeof(ctx)); |
| for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { |
| ctx.handle = i; |
| if ( DRM_COPY_TO_USER( &res.contexts[i], |
| &ctx, sizeof(ctx) ) ) |
| 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); |
| } |
| |
| if (dev->driver.context_ctor && ctx.handle != DRM_KERNEL_CONTEXT) { |
| DRM_LOCK(); |
| dev->driver.context_ctor(dev, ctx.handle); |
| DRM_UNLOCK(); |
| } |
| |
| 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 ) { |
| if (dev->driver.context_dtor) { |
| DRM_LOCK(); |
| dev->driver.context_dtor(dev, ctx.handle); |
| DRM_UNLOCK(); |
| } |
| |
| drm_ctxbitmap_free(dev, ctx.handle); |
| } |
| |
| return 0; |
| } |