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Diffstat (limited to 'nx-X11/extras/drm/bsd-core/drm_context.c')
-rw-r--r--nx-X11/extras/drm/bsd-core/drm_context.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/nx-X11/extras/drm/bsd-core/drm_context.c b/nx-X11/extras/drm/bsd-core/drm_context.c
new file mode 100644
index 000000000..8e0095403
--- /dev/null
+++ b/nx-X11/extras/drm/bsd-core/drm_context.c
@@ -0,0 +1,345 @@
+/* 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;
+}
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