Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

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;
+}