diff options
| author | drochner <drochner@NetBSD.org> | 2007-03-20 18:05:25 +0000 |
|---|---|---|
| committer | drochner <drochner@NetBSD.org> | 2007-03-20 18:05:25 +0000 |
| commit | 2d9e04fc35ca8ddfed6238ce480db06ec7d7d76e (patch) | |
| tree | eba0e8e954885cfb2067de846ecfd99f432a0b9c /sys/dev/drm/drm_context.c | |
| parent | f8ef9d143184e5e22d51bde02aecb408dc9e3925 (diff) | |
Import DRM drivers, brought into shape by Yorick Hardy, posted to tech-x11.
Minor modifications by me:
-use an mi device major number
-(coarsly) divided into pci card specific and less specific parts, moved
the latter to dev/drm
-renamed autoconf attributes to reflect this
Todo:
-adapt all card frontends but i915 to drm include file location
-review the mtrr change
-make the change to agp_i810.c coexist with the fix for buggy VESA
BIOSes which is commented out temporarily
-RCS IDs etc style stuff
-LKM support (rescan support for vga)
-test
Diffstat (limited to 'sys/dev/drm/drm_context.c')
| -rw-r--r-- | sys/dev/drm/drm_context.c | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/sys/dev/drm/drm_context.c b/sys/dev/drm/drm_context.c new file mode 100644 index 00000000000..3f98fdb3fb0 --- /dev/null +++ b/sys/dev/drm/drm_context.c @@ -0,0 +1,350 @@ +/* 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 <sys/cdefs.h> +/* +__FBSDID("$FreeBSD: src/sys/dev/drm/drm_context.c,v 1.2 2005/11/28 23:13:52 anholt Exp $"); +*/ + +#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; +} |
