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drm/bsd-core/drm_context.c

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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>
*
*/
#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;
int i;
DRM_COPY_FROM_USER_IOCTL( res, (drm_ctx_res_t *)data, sizeof(res) );
if ( res.count >= DRM_RESERVED_CONTEXTS ) {
for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; 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);
}
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;
}
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