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, 590 insertions, 0 deletions

diff --git a/nx-X11/extras/drm/linux-core/drm_context.c b/nx-X11/extras/drm/linux-core/drm_context.c
new file mode 100644
index 000000000..5947c8e6d
--- /dev/null
+++ b/nx-X11/extras/drm/linux-core/drm_context.c
@@ -0,0 +1,590 @@
+/**
+ * \file drm_context.c
+ * IOCTLs for generic contexts
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ * ChangeLog:
+ *  2001-11-16	Torsten Duwe <duwe@caldera.de>
+ *		added context constructor/destructor hooks,
+ *		needed by SiS driver's memory management.
+ */
+
+#include "drmP.h"
+
+/******************************************************************/
+/** \name Context bitmap support */
+/*@{*/
+
+/**
+ * Free a handle from the context bitmap.
+ *
+ * \param dev DRM device.
+ * \param ctx_handle context handle.
+ *
+ * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
+ * in drm_device::context_sareas, while holding the drm_device::struct_sem
+ * lock.
+ */
+void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle)
+{
+	if (ctx_handle < 0)
+		goto failed;
+	if (!dev->ctx_bitmap)
+		goto failed;
+
+	if (ctx_handle < DRM_MAX_CTXBITMAP) {
+		down(&dev->struct_sem);
+		clear_bit(ctx_handle, dev->ctx_bitmap);
+		dev->context_sareas[ctx_handle] = NULL;
+		up(&dev->struct_sem);
+		return;
+	}
+      failed:
+	DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle);
+	return;
+}
+
+/**
+ * Context bitmap allocation.
+ *
+ * \param dev DRM device.
+ * \return (non-negative) context handle on success or a negative number on failure.
+ *
+ * Find the first zero bit in drm_device::ctx_bitmap and (re)allocates
+ * drm_device::context_sareas to accommodate the new entry while holding the
+ * drm_device::struct_sem lock.
+ */
+static int drm_ctxbitmap_next(drm_device_t * dev)
+{
+	int bit;
+
+	if (!dev->ctx_bitmap)
+		return -1;
+
+	down(&dev->struct_sem);
+	bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP);
+	if (bit < DRM_MAX_CTXBITMAP) {
+		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) {
+				drm_map_t **ctx_sareas;
+
+				ctx_sareas = drm_realloc(dev->context_sareas,
+							 (dev->max_context -
+							  1) *
+							 sizeof(*dev->
+								context_sareas),
+							 dev->max_context *
+							 sizeof(*dev->
+								context_sareas),
+							 DRM_MEM_MAPS);
+				if (!ctx_sareas) {
+					clear_bit(bit, dev->ctx_bitmap);
+					up(&dev->struct_sem);
+					return -1;
+				}
+				dev->context_sareas = ctx_sareas;
+				dev->context_sareas[bit] = NULL;
+			} else {
+				/* max_context == 1 at this point */
+				dev->context_sareas =
+				    drm_alloc(dev->max_context *
+					      sizeof(*dev->context_sareas),
+					      DRM_MEM_MAPS);
+				if (!dev->context_sareas) {
+					clear_bit(bit, dev->ctx_bitmap);
+					up(&dev->struct_sem);
+					return -1;
+				}
+				dev->context_sareas[bit] = NULL;
+			}
+		}
+		up(&dev->struct_sem);
+		return bit;
+	}
+	up(&dev->struct_sem);
+	return -1;
+}
+
+/**
+ * Context bitmap initialization.
+ *
+ * \param dev DRM device.
+ *
+ * Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding
+ * the drm_device::struct_sem lock.
+ */
+int drm_ctxbitmap_init(drm_device_t * dev)
+{
+	int i;
+	int temp;
+
+	down(&dev->struct_sem);
+	dev->ctx_bitmap = (unsigned long *)drm_alloc(PAGE_SIZE,
+						     DRM_MEM_CTXBITMAP);
+	if (dev->ctx_bitmap == NULL) {
+		up(&dev->struct_sem);
+		return -ENOMEM;
+	}
+	memset((void *)dev->ctx_bitmap, 0, PAGE_SIZE);
+	dev->context_sareas = NULL;
+	dev->max_context = -1;
+	up(&dev->struct_sem);
+
+	for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+		temp = drm_ctxbitmap_next(dev);
+		DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp);
+	}
+
+	return 0;
+}
+
+/**
+ * Context bitmap cleanup.
+ *
+ * \param dev DRM device.
+ *
+ * Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding
+ * the drm_device::struct_sem lock.
+ */
+void drm_ctxbitmap_cleanup(drm_device_t * dev)
+{
+	down(&dev->struct_sem);
+	if (dev->context_sareas)
+		drm_free(dev->context_sareas,
+			 sizeof(*dev->context_sareas) *
+			 dev->max_context, DRM_MEM_MAPS);
+	drm_free((void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP);
+	up(&dev->struct_sem);
+}
+
+/*@}*/
+
+/******************************************************************/
+/** \name Per Context SAREA Support */
+/*@{*/
+
+/**
+ * Get per-context SAREA.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx_priv_map structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Gets the map from drm_device::context_sareas with the handle specified and
+ * returns its handle.
+ */
+int drm_getsareactx(struct inode *inode, struct file *filp,
+		    unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_ctx_priv_map_t __user *argp = (void __user *)arg;
+	drm_ctx_priv_map_t request;
+	drm_map_t *map;
+	drm_map_list_t *_entry;
+
+	if (copy_from_user(&request, argp, sizeof(request)))
+		return -EFAULT;
+
+	down(&dev->struct_sem);
+	if (dev->max_context < 0
+	    || request.ctx_id >= (unsigned)dev->max_context) {
+		up(&dev->struct_sem);
+		return -EINVAL;
+	}
+
+	map = dev->context_sareas[request.ctx_id];
+	up(&dev->struct_sem);
+
+	request.handle = 0;
+	list_for_each_entry(_entry, &dev->maplist->head,head) {
+		if (_entry->map == map) {
+			request.handle = (void *)(unsigned long)_entry->user_token;
+			break;
+		}
+	}
+	if (request.handle == 0)
+		return -EINVAL;
+
+	if (copy_to_user(argp, &request, sizeof(request)))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * Set per-context SAREA.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx_priv_map structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Searches the mapping specified in \p arg and update the entry in
+ * drm_device::context_sareas with it.
+ */
+int drm_setsareactx(struct inode *inode, struct file *filp,
+		    unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_ctx_priv_map_t request;
+	drm_map_t *map = NULL;
+	drm_map_list_t *r_list = NULL;
+	struct list_head *list;
+
+	if (copy_from_user(&request,
+			   (drm_ctx_priv_map_t __user *) arg, sizeof(request)))
+		return -EFAULT;
+
+	down(&dev->struct_sem);
+	list_for_each(list, &dev->maplist->head) {
+		r_list = list_entry(list, drm_map_list_t, head);
+		if (r_list->map
+		    && r_list->user_token == (unsigned long) request.handle)
+			goto found;
+	}
+      bad:
+	up(&dev->struct_sem);
+	return -EINVAL;
+
+      found:
+	map = r_list->map;
+	if (!map)
+		goto bad;
+	if (dev->max_context < 0)
+		goto bad;
+	if (request.ctx_id >= (unsigned)dev->max_context)
+		goto bad;
+	dev->context_sareas[request.ctx_id] = map;
+	up(&dev->struct_sem);
+	return 0;
+}
+
+/*@}*/
+
+/******************************************************************/
+/** \name The actual DRM context handling routines */
+/*@{*/
+
+/**
+ * Switch context.
+ *
+ * \param dev DRM device.
+ * \param old old context handle.
+ * \param new new context handle.
+ * \return zero on success or a negative number on failure.
+ *
+ * Attempt to set drm_device::context_flag.
+ */
+static 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 -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;
+}
+
+/**
+ * Complete context switch.
+ *
+ * \param dev DRM device.
+ * \param new new context handle.
+ * \return zero on success or a negative number on failure.
+ *
+ * Updates drm_device::last_context and drm_device::last_switch. Verifies the
+ * hardware lock is held, clears the drm_device::context_flag and wakes up
+ * drm_device::context_wait.
+ */
+int drm_context_switch_complete(drm_device_t * dev, int new)
+{
+	dev->last_context = new;	/* PRE/POST: This is the _only_ writer. */
+	dev->last_switch = jiffies;
+
+	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);
+	wake_up(&dev->context_wait);
+
+	return 0;
+}
+
+/**
+ * Reserve contexts.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx_res structure.
+ * \return zero on success or a negative number on failure.
+ */
+int drm_resctx(struct inode *inode, struct file *filp,
+	       unsigned int cmd, unsigned long arg)
+{
+	drm_ctx_res_t res;
+	drm_ctx_t __user *argp = (void __user *)arg;
+	drm_ctx_t ctx;
+	int i;
+
+	if (copy_from_user(&res, argp, sizeof(res)))
+		return -EFAULT;
+
+	if (res.count >= DRM_RESERVED_CONTEXTS) {
+		memset(&ctx, 0, sizeof(ctx));
+		for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+			ctx.handle = i;
+			if (copy_to_user(&res.contexts[i], &ctx, sizeof(ctx)))
+				return -EFAULT;
+		}
+	}
+	res.count = DRM_RESERVED_CONTEXTS;
+
+	if (copy_to_user(argp, &res, sizeof(res)))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * Add context.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Get a new handle for the context and copy to userspace.
+ */
+int drm_addctx(struct inode *inode, struct file *filp,
+	       unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_ctx_list_t *ctx_entry;
+	drm_ctx_t __user *argp = (void __user *)arg;
+	drm_ctx_t ctx;
+
+	if (copy_from_user(&ctx, argp, sizeof(ctx)))
+		return -EFAULT;
+
+	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 -ENOMEM;
+	}
+
+	if (ctx.handle != DRM_KERNEL_CONTEXT) {
+		if (dev->driver->context_ctor)
+			dev->driver->context_ctor(dev, ctx.handle);
+	}
+
+	ctx_entry = drm_alloc(sizeof(*ctx_entry), DRM_MEM_CTXLIST);
+	if (!ctx_entry) {
+		DRM_DEBUG("out of memory\n");
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD(&ctx_entry->head);
+	ctx_entry->handle = ctx.handle;
+	ctx_entry->tag = priv;
+
+	down(&dev->ctxlist_sem);
+	list_add(&ctx_entry->head, &dev->ctxlist->head);
+	++dev->ctx_count;
+	up(&dev->ctxlist_sem);
+
+	if (copy_to_user(argp, &ctx, sizeof(ctx)))
+		return -EFAULT;
+	return 0;
+}
+
+int drm_modctx(struct inode *inode, struct file *filp,
+	       unsigned int cmd, unsigned long arg)
+{
+	/* This does nothing */
+	return 0;
+}
+
+/**
+ * Get context.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ */
+int drm_getctx(struct inode *inode, struct file *filp,
+	       unsigned int cmd, unsigned long arg)
+{
+	drm_ctx_t __user *argp = (void __user *)arg;
+	drm_ctx_t ctx;
+
+	if (copy_from_user(&ctx, argp, sizeof(ctx)))
+		return -EFAULT;
+
+	/* This is 0, because we don't handle any context flags */
+	ctx.flags = 0;
+
+	if (copy_to_user(argp, &ctx, sizeof(ctx)))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * Switch context.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls context_switch().
+ */
+int drm_switchctx(struct inode *inode, struct file *filp,
+		  unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_ctx_t ctx;
+
+	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
+		return -EFAULT;
+
+	DRM_DEBUG("%d\n", ctx.handle);
+	return drm_context_switch(dev, dev->last_context, ctx.handle);
+}
+
+/**
+ * New context.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls context_switch_complete().
+ */
+int drm_newctx(struct inode *inode, struct file *filp,
+	       unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_ctx_t ctx;
+
+	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
+		return -EFAULT;
+
+	DRM_DEBUG("%d\n", ctx.handle);
+	drm_context_switch_complete(dev, ctx.handle);
+
+	return 0;
+}
+
+/**
+ * Remove context.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument pointing to a drm_ctx structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * If not the special kernel context, calls ctxbitmap_free() to free the specified context.
+ */
+int drm_rmctx(struct inode *inode, struct file *filp,
+	      unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_ctx_t ctx;
+
+	if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
+		return -EFAULT;
+
+	DRM_DEBUG("%d\n", ctx.handle);
+	if (ctx.handle == DRM_KERNEL_CONTEXT + 1) {
+		priv->remove_auth_on_close = 1;
+	}
+	if (ctx.handle != DRM_KERNEL_CONTEXT) {
+		if (dev->driver->context_dtor)
+			dev->driver->context_dtor(dev, ctx.handle);
+		drm_ctxbitmap_free(dev, ctx.handle);
+	}
+
+	down(&dev->ctxlist_sem);
+	if (!list_empty(&dev->ctxlist->head)) {
+		drm_ctx_list_t *pos, *n;
+
+		list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
+			if (pos->handle == ctx.handle) {
+				list_del(&pos->head);
+				drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
+				--dev->ctx_count;
+			}
+		}
+	}
+	up(&dev->ctxlist_sem);
+
+	return 0;
+}
+
+/*@}*/