[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / drm / drm_context.c

/**
 * \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::ctx_idr, while holding the drm_device::struct_mutex
 * lock.
 */
void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
{
	mutex_lock(&dev->struct_mutex);
	idr_remove(&dev->ctx_idr, ctx_handle);
	mutex_unlock(&dev->struct_mutex);
}

/**
 * Context bitmap allocation.
 *
 * \param dev DRM device.
 * \return (non-negative) context handle on success or a negative number on failure.
 *
 * Allocate a new idr from drm_device::ctx_idr while holding the
 * drm_device::struct_mutex lock.
 */
static int drm_ctxbitmap_next(struct drm_device * dev)
{
	int new_id;
	int ret;

again:
	if (idr_pre_get(&dev->ctx_idr, GFP_KERNEL) == 0) {
		DRM_ERROR("Out of memory expanding drawable idr\n");
		return -ENOMEM;
	}
	mutex_lock(&dev->struct_mutex);
	ret = idr_get_new_above(&dev->ctx_idr, NULL,
				DRM_RESERVED_CONTEXTS, &new_id);
	if (ret == -EAGAIN) {
		mutex_unlock(&dev->struct_mutex);
		goto again;
	}
	mutex_unlock(&dev->struct_mutex);
	return new_id;
}

/**
 * Context bitmap initialization.
 *
 * \param dev DRM device.
 *
 * Initialise the drm_device::ctx_idr
 */
int drm_ctxbitmap_init(struct drm_device * dev)
{
	idr_init(&dev->ctx_idr);
	return 0;
}

/**
 * Context bitmap cleanup.
 *
 * \param dev DRM device.
 *
 * Free all idr members using drm_ctx_sarea_free helper function
 * while holding the drm_device::struct_mutex lock.
 */
void drm_ctxbitmap_cleanup(struct drm_device * dev)
{
	mutex_lock(&dev->struct_mutex);
	idr_remove_all(&dev->ctx_idr);
	mutex_unlock(&dev->struct_mutex);
}

/*@}*/

/******************************************************************/
/** \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::ctx_idr with the handle specified and
 * returns its handle.
 */
int drm_getsareactx(struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_ctx_priv_map __user *argp = (void __user *)arg;
	struct drm_ctx_priv_map request;
	struct drm_map *map;
	struct drm_map_list *_entry;

	if (copy_from_user(&request, argp, sizeof(request)))
		return -EFAULT;

	mutex_lock(&dev->struct_mutex);

	map = idr_find(&dev->ctx_idr, request.ctx_id);
	if (!map) {
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	mutex_unlock(&dev->struct_mutex);

	request.handle = NULL;
	list_for_each_entry(_entry, &dev->maplist, head) {
		if (_entry->map == map) {
			request.handle =
			    (void *)(unsigned long)_entry->user_token;
			break;
		}
	}
	if (request.handle == NULL)
		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::ctx_idr with it.
 */
int drm_setsareactx(struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_ctx_priv_map request;
	struct drm_map *map = NULL;
	struct drm_map_list *r_list = NULL;

	if (copy_from_user(&request,
			   (struct drm_ctx_priv_map __user *) arg,
			   sizeof(request)))
		return -EFAULT;

	mutex_lock(&dev->struct_mutex);
	list_for_each_entry(r_list, &dev->maplist, head) {
		if (r_list->map
		    && r_list->user_token == (unsigned long)request.handle)
			goto found;
	}
      bad:
	mutex_unlock(&dev->struct_mutex);
	return -EINVAL;

      found:
	map = r_list->map;
	if (!map)
		goto bad;

	if (IS_ERR(idr_replace(&dev->ctx_idr, map, request.ctx_id)))
		goto bad;

	mutex_unlock(&dev->struct_mutex);
	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(struct drm_device * 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.
 */
static int drm_context_switch_complete(struct drm_device * 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)
{
	struct drm_ctx_res res;
	struct drm_ctx_res __user *argp = (void __user *)arg;
	struct drm_ctx 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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_ctx_list *ctx_entry;
	struct drm_ctx __user *argp = (void __user *)arg;
	struct drm_ctx 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)
			if (!dev->driver->context_ctor(dev, ctx.handle)) {
				DRM_DEBUG("Running out of ctxs or memory.\n");
				return -ENOMEM;
			}
	}

	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;

	mutex_lock(&dev->ctxlist_mutex);
	list_add(&ctx_entry->head, &dev->ctxlist);
	++dev->ctx_count;
	mutex_unlock(&dev->ctxlist_mutex);

	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)
{
	struct drm_ctx __user *argp = (void __user *)arg;
	struct drm_ctx 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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_ctx ctx;

	if (copy_from_user(&ctx, (struct drm_ctx __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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_ctx ctx;

	if (copy_from_user(&ctx, (struct drm_ctx __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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_ctx ctx;

	if (copy_from_user(&ctx, (struct drm_ctx __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);
	}

	mutex_lock(&dev->ctxlist_mutex);
	if (!list_empty(&dev->ctxlist)) {
		struct drm_ctx_list *pos, *n;

		list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
			if (pos->handle == ctx.handle) {
				list_del(&pos->head);
				drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
				--dev->ctx_count;
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	return 0;
}

/*@}*/
Commit	Line	Data
1da177e4	1	/**
b5e89ed5	2	* \file drm_context.c
1da177e4	3	* IOCTLs for generic contexts
b5e89ed5	4	*
1da177e4 LT	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Gareth Hughes <gareth@valinux.com>
	7	*/
	8
	9	/*
	10	* Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
	11	*
	12	* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
	13	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	14	* All Rights Reserved.
	15	*
	16	* Permission is hereby granted, free of charge, to any person obtaining a
	17	* copy of this software and associated documentation files (the "Software"),
	18	* to deal in the Software without restriction, including without limitation
	19	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	20	* and/or sell copies of the Software, and to permit persons to whom the
	21	* Software is furnished to do so, subject to the following conditions:
	22	*
	23	* The above copyright notice and this permission notice (including the next
	24	* paragraph) shall be included in all copies or substantial portions of the
	25	* Software.
	26	*
	27	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	28	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	29	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	30	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	31	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	32	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	33	* OTHER DEALINGS IN THE SOFTWARE.
	34	*/
	35
	36	/*
	37	* ChangeLog:
	38	* 2001-11-16 Torsten Duwe <duwe@caldera.de>
	39	* added context constructor/destructor hooks,
	40	* needed by SiS driver's memory management.
	41	*/
	42
	43	#include "drmP.h"
	44
	45	/******************************************************************/
	46	/** \name Context bitmap support */
	47	/@{/
	48
	49	/**
	50	* Free a handle from the context bitmap.
	51	*
	52	* \param dev DRM device.
	53	* \param ctx_handle context handle.
	54	*
	55	* Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
62968144	56	* in drm_device::ctx_idr, while holding the drm_device::struct_mutex
1da177e4 LT	57	* lock.
1da177e4 LT	58	*/
84b1fd10	59	void drm_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
1da177e4	60	{
62968144 DA	61	mutex_lock(&dev->struct_mutex);
	62	idr_remove(&dev->ctx_idr, ctx_handle);
	63	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	64	}
1da177e4 LT	65
b5e89ed5	66	/**
1da177e4 LT	67	* Context bitmap allocation.
	68	*
	69	* \param dev DRM device.
	70	* \return (non-negative) context handle on success or a negative number on failure.
	71	*
62968144	72	* Allocate a new idr from drm_device::ctx_idr while holding the
30e2fb18	73	* drm_device::struct_mutex lock.
1da177e4	74	*/
84b1fd10	75	static int drm_ctxbitmap_next(struct drm_device * dev)
1da177e4	76	{
62968144 DA	77	int new_id;
62968144 DA	78	int ret;
1da177e4	79
62968144 DA	80	again:
	81	if (idr_pre_get(&dev->ctx_idr, GFP_KERNEL) == 0) {
	82	DRM_ERROR("Out of memory expanding drawable idr\n");
	83	return -ENOMEM;
	84	}
30e2fb18	85	mutex_lock(&dev->struct_mutex);
62968144 DA	86	ret = idr_get_new_above(&dev->ctx_idr, NULL,
	87	DRM_RESERVED_CONTEXTS, &new_id);
	88	if (ret == -EAGAIN) {
30e2fb18	89	mutex_unlock(&dev->struct_mutex);
62968144	90	goto again;
1da177e4	91	}
30e2fb18	92	mutex_unlock(&dev->struct_mutex);
62968144	93	return new_id;
1da177e4 LT	94	}
	95
	96	/**
	97	* Context bitmap initialization.
	98	*
	99	* \param dev DRM device.
	100	*
62968144	101	* Initialise the drm_device::ctx_idr
1da177e4	102	*/
84b1fd10	103	int drm_ctxbitmap_init(struct drm_device * dev)
1da177e4	104	{
62968144	105	idr_init(&dev->ctx_idr);
1da177e4 LT	106	return 0;
	107	}
	108
	109	/**
	110	* Context bitmap cleanup.
	111	*
	112	* \param dev DRM device.
	113	*
62968144 DA	114	* Free all idr members using drm_ctx_sarea_free helper function
62968144 DA	115	* while holding the drm_device::struct_mutex lock.
1da177e4	116	*/
84b1fd10	117	void drm_ctxbitmap_cleanup(struct drm_device * dev)
1da177e4	118	{
30e2fb18	119	mutex_lock(&dev->struct_mutex);
62968144	120	idr_remove_all(&dev->ctx_idr);
30e2fb18	121	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	122	}
	123
	124	/@}/
	125
	126	/******************************************************************/
	127	/** \name Per Context SAREA Support */
	128	/@{/
	129
	130	/**
	131	* Get per-context SAREA.
b5e89ed5	132	*
1da177e4 LT	133	* \param inode device inode.
	134	* \param filp file pointer.
	135	* \param cmd command.
	136	* \param arg user argument pointing to a drm_ctx_priv_map structure.
	137	* \return zero on success or a negative number on failure.
	138	*
62968144	139	* Gets the map from drm_device::ctx_idr with the handle specified and
1da177e4 LT	140	* returns its handle.
	141	*/
	142	int drm_getsareactx(struct inode inode, struct file filp,
b5e89ed5	143	unsigned int cmd, unsigned long arg)
1da177e4	144	{
84b1fd10 DA	145	struct drm_file *priv = filp->private_data;
84b1fd10 DA	146	struct drm_device *dev = priv->head->dev;
c60ce623 DA	147	struct drm_ctx_priv_map __user argp = (void __user )arg;
	148	struct drm_ctx_priv_map request;
	149	struct drm_map *map;
55910517	150	struct drm_map_list *_entry;
1da177e4 LT	151
	152	if (copy_from_user(&request, argp, sizeof(request)))
	153	return -EFAULT;
	154
30e2fb18	155	mutex_lock(&dev->struct_mutex);
62968144 DA	156
	157	map = idr_find(&dev->ctx_idr, request.ctx_id);
	158	if (!map) {
30e2fb18	159	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	160	return -EINVAL;
	161	}
	162
30e2fb18	163	mutex_unlock(&dev->struct_mutex);
1da177e4	164
b3a83639	165	request.handle = NULL;
bd1b331f	166	list_for_each_entry(_entry, &dev->maplist, head) {
d1f2b55a	167	if (_entry->map == map) {
b5e89ed5 DA	168	request.handle =
b5e89ed5 DA	169	(void *)(unsigned long)_entry->user_token;
d1f2b55a DA	170	break;
	171	}
	172	}
b3a83639	173	if (request.handle == NULL)
d1f2b55a DA	174	return -EINVAL;
d1f2b55a DA	175
1da177e4 LT	176	if (copy_to_user(argp, &request, sizeof(request)))
	177	return -EFAULT;
	178	return 0;
	179	}
	180
	181	/**
	182	* Set per-context SAREA.
b5e89ed5	183	*
1da177e4 LT	184	* \param inode device inode.
	185	* \param filp file pointer.
	186	* \param cmd command.
	187	* \param arg user argument pointing to a drm_ctx_priv_map structure.
	188	* \return zero on success or a negative number on failure.
	189	*
	190	* Searches the mapping specified in \p arg and update the entry in
62968144	191	* drm_device::ctx_idr with it.
1da177e4 LT	192	*/
1da177e4 LT	193	int drm_setsareactx(struct inode inode, struct file filp,
b5e89ed5	194	unsigned int cmd, unsigned long arg)
1da177e4	195	{
84b1fd10 DA	196	struct drm_file *priv = filp->private_data;
84b1fd10 DA	197	struct drm_device *dev = priv->head->dev;
c60ce623 DA	198	struct drm_ctx_priv_map request;
c60ce623 DA	199	struct drm_map *map = NULL;
55910517	200	struct drm_map_list *r_list = NULL;
1da177e4 LT	201
1da177e4 LT	202	if (copy_from_user(&request,
c60ce623 DA	203	(struct drm_ctx_priv_map __user *) arg,
c60ce623 DA	204	sizeof(request)))
1da177e4 LT	205	return -EFAULT;
1da177e4 LT	206
30e2fb18	207	mutex_lock(&dev->struct_mutex);
bd1b331f	208	list_for_each_entry(r_list, &dev->maplist, head) {
9a186645	209	if (r_list->map
b5e89ed5	210	&& r_list->user_token == (unsigned long)request.handle)
1da177e4 LT	211	goto found;
1da177e4 LT	212	}
b5e89ed5	213	bad:
30e2fb18	214	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	215	return -EINVAL;
1da177e4 LT	216
b5e89ed5	217	found:
1da177e4	218	map = r_list->map;
b5e89ed5 DA	219	if (!map)
b5e89ed5 DA	220	goto bad;
62968144 DA	221
62968144 DA	222	if (IS_ERR(idr_replace(&dev->ctx_idr, map, request.ctx_id)))
1da177e4	223	goto bad;
62968144	224
30e2fb18	225	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	226	return 0;
	227	}
	228
	229	/@}/
	230
	231	/******************************************************************/
	232	/** \name The actual DRM context handling routines */
	233	/@{/
	234
	235	/**
	236	* Switch context.
	237	*
	238	* \param dev DRM device.
	239	* \param old old context handle.
	240	* \param new new context handle.
	241	* \return zero on success or a negative number on failure.
	242	*
	243	* Attempt to set drm_device::context_flag.
	244	*/
84b1fd10	245	static int drm_context_switch(struct drm_device * dev, int old, int new)
1da177e4	246	{
b5e89ed5 DA	247	if (test_and_set_bit(0, &dev->context_flag)) {
	248	DRM_ERROR("Reentering -- FIXME\n");
	249	return -EBUSY;
	250	}
1da177e4	251
b5e89ed5	252	DRM_DEBUG("Context switch from %d to %d\n", old, new);
1da177e4	253
b5e89ed5 DA	254	if (new == dev->last_context) {
	255	clear_bit(0, &dev->context_flag);
	256	return 0;
	257	}
1da177e4	258
b5e89ed5	259	return 0;
1da177e4 LT	260	}
	261
	262	/**
	263	* Complete context switch.
	264	*
	265	* \param dev DRM device.
	266	* \param new new context handle.
	267	* \return zero on success or a negative number on failure.
	268	*
	269	* Updates drm_device::last_context and drm_device::last_switch. Verifies the
	270	* hardware lock is held, clears the drm_device::context_flag and wakes up
	271	* drm_device::context_wait.
	272	*/
84b1fd10	273	static int drm_context_switch_complete(struct drm_device * dev, int new)
1da177e4	274	{
b5e89ed5 DA	275	dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
b5e89ed5 DA	276	dev->last_switch = jiffies;
1da177e4	277
b5e89ed5 DA	278	if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
	279	DRM_ERROR("Lock isn't held after context switch\n");
	280	}
1da177e4	281
b5e89ed5 DA	282	/* If a context switch is ever initiated
	283	when the kernel holds the lock, release
	284	that lock here. */
	285	clear_bit(0, &dev->context_flag);
	286	wake_up(&dev->context_wait);
1da177e4	287
b5e89ed5	288	return 0;
1da177e4 LT	289	}
	290
	291	/**
	292	* Reserve contexts.
	293	*
	294	* \param inode device inode.
	295	* \param filp file pointer.
	296	* \param cmd command.
	297	* \param arg user argument pointing to a drm_ctx_res structure.
	298	* \return zero on success or a negative number on failure.
	299	*/
b5e89ed5 DA	300	int drm_resctx(struct inode inode, struct file filp,
b5e89ed5 DA	301	unsigned int cmd, unsigned long arg)
1da177e4	302	{
c60ce623 DA	303	struct drm_ctx_res res;
	304	struct drm_ctx_res __user argp = (void __user )arg;
	305	struct drm_ctx ctx;
1da177e4 LT	306	int i;
1da177e4 LT	307
b5e89ed5	308	if (copy_from_user(&res, argp, sizeof(res)))
1da177e4 LT	309	return -EFAULT;
1da177e4 LT	310
b5e89ed5 DA	311	if (res.count >= DRM_RESERVED_CONTEXTS) {
	312	memset(&ctx, 0, sizeof(ctx));
	313	for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
1da177e4	314	ctx.handle = i;
b5e89ed5	315	if (copy_to_user(&res.contexts[i], &ctx, sizeof(ctx)))
1da177e4 LT	316	return -EFAULT;
	317	}
	318	}
	319	res.count = DRM_RESERVED_CONTEXTS;
	320
b5e89ed5	321	if (copy_to_user(argp, &res, sizeof(res)))
1da177e4 LT	322	return -EFAULT;
	323	return 0;
	324	}
	325
	326	/**
	327	* Add context.
	328	*
	329	* \param inode device inode.
	330	* \param filp file pointer.
	331	* \param cmd command.
	332	* \param arg user argument pointing to a drm_ctx structure.
	333	* \return zero on success or a negative number on failure.
	334	*
	335	* Get a new handle for the context and copy to userspace.
	336	*/
b5e89ed5 DA	337	int drm_addctx(struct inode inode, struct file filp,
b5e89ed5 DA	338	unsigned int cmd, unsigned long arg)
1da177e4	339	{
84b1fd10 DA	340	struct drm_file *priv = filp->private_data;
84b1fd10 DA	341	struct drm_device *dev = priv->head->dev;
55910517	342	struct drm_ctx_list *ctx_entry;
c60ce623 DA	343	struct drm_ctx __user argp = (void __user )arg;
c60ce623 DA	344	struct drm_ctx ctx;
1da177e4	345
b5e89ed5	346	if (copy_from_user(&ctx, argp, sizeof(ctx)))
1da177e4 LT	347	return -EFAULT;
1da177e4 LT	348
b5e89ed5 DA	349	ctx.handle = drm_ctxbitmap_next(dev);
	350	if (ctx.handle == DRM_KERNEL_CONTEXT) {
	351	/* Skip kernel's context and get a new one. */
	352	ctx.handle = drm_ctxbitmap_next(dev);
1da177e4	353	}
b5e89ed5 DA	354	DRM_DEBUG("%d\n", ctx.handle);
	355	if (ctx.handle == -1) {
	356	DRM_DEBUG("Not enough free contexts.\n");
	357	/* Should this return -EBUSY instead? */
1da177e4 LT	358	return -ENOMEM;
	359	}
	360
b5e89ed5	361	if (ctx.handle != DRM_KERNEL_CONTEXT) {
1da177e4	362	if (dev->driver->context_ctor)
1e7d5190	363	if (!dev->driver->context_ctor(dev, ctx.handle)) {
b5e9fc13 DA	364	DRM_DEBUG("Running out of ctxs or memory.\n");
	365	return -ENOMEM;
	366	}
1da177e4 LT	367	}
1da177e4 LT	368
b5e89ed5 DA	369	ctx_entry = drm_alloc(sizeof(*ctx_entry), DRM_MEM_CTXLIST);
b5e89ed5 DA	370	if (!ctx_entry) {
1da177e4 LT	371	DRM_DEBUG("out of memory\n");
	372	return -ENOMEM;
	373	}
	374
b5e89ed5	375	INIT_LIST_HEAD(&ctx_entry->head);
1da177e4 LT	376	ctx_entry->handle = ctx.handle;
	377	ctx_entry->tag = priv;
	378
30e2fb18	379	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	380	list_add(&ctx_entry->head, &dev->ctxlist);
1da177e4	381	++dev->ctx_count;
30e2fb18	382	mutex_unlock(&dev->ctxlist_mutex);
1da177e4	383
b5e89ed5	384	if (copy_to_user(argp, &ctx, sizeof(ctx)))
1da177e4 LT	385	return -EFAULT;
	386	return 0;
	387	}
	388
b5e89ed5 DA	389	int drm_modctx(struct inode inode, struct file filp,
b5e89ed5 DA	390	unsigned int cmd, unsigned long arg)
1da177e4 LT	391	{
	392	/* This does nothing */
	393	return 0;
	394	}
	395
	396	/**
	397	* Get context.
	398	*
	399	* \param inode device inode.
	400	* \param filp file pointer.
	401	* \param cmd command.
	402	* \param arg user argument pointing to a drm_ctx structure.
	403	* \return zero on success or a negative number on failure.
	404	*/
b5e89ed5 DA	405	int drm_getctx(struct inode inode, struct file filp,
b5e89ed5 DA	406	unsigned int cmd, unsigned long arg)
1da177e4	407	{
c60ce623 DA	408	struct drm_ctx __user argp = (void __user )arg;
c60ce623 DA	409	struct drm_ctx ctx;
1da177e4	410
b5e89ed5	411	if (copy_from_user(&ctx, argp, sizeof(ctx)))
1da177e4 LT	412	return -EFAULT;
	413
	414	/* This is 0, because we don't handle any context flags */
	415	ctx.flags = 0;
	416
b5e89ed5	417	if (copy_to_user(argp, &ctx, sizeof(ctx)))
1da177e4 LT	418	return -EFAULT;
	419	return 0;
	420	}
	421
	422	/**
	423	* Switch context.
	424	*
	425	* \param inode device inode.
	426	* \param filp file pointer.
	427	* \param cmd command.
	428	* \param arg user argument pointing to a drm_ctx structure.
	429	* \return zero on success or a negative number on failure.
	430	*
	431	* Calls context_switch().
	432	*/
b5e89ed5 DA	433	int drm_switchctx(struct inode inode, struct file filp,
b5e89ed5 DA	434	unsigned int cmd, unsigned long arg)
1da177e4	435	{
84b1fd10 DA	436	struct drm_file *priv = filp->private_data;
84b1fd10 DA	437	struct drm_device *dev = priv->head->dev;
c60ce623	438	struct drm_ctx ctx;
1da177e4	439
c60ce623	440	if (copy_from_user(&ctx, (struct drm_ctx __user *) arg, sizeof(ctx)))
1da177e4 LT	441	return -EFAULT;
1da177e4 LT	442
b5e89ed5 DA	443	DRM_DEBUG("%d\n", ctx.handle);
b5e89ed5 DA	444	return drm_context_switch(dev, dev->last_context, ctx.handle);
1da177e4 LT	445	}
	446
	447	/**
	448	* New context.
	449	*
	450	* \param inode device inode.
	451	* \param filp file pointer.
	452	* \param cmd command.
	453	* \param arg user argument pointing to a drm_ctx structure.
	454	* \return zero on success or a negative number on failure.
	455	*
	456	* Calls context_switch_complete().
	457	*/
b5e89ed5 DA	458	int drm_newctx(struct inode inode, struct file filp,
b5e89ed5 DA	459	unsigned int cmd, unsigned long arg)
1da177e4	460	{
84b1fd10 DA	461	struct drm_file *priv = filp->private_data;
84b1fd10 DA	462	struct drm_device *dev = priv->head->dev;
c60ce623	463	struct drm_ctx ctx;
1da177e4	464
c60ce623	465	if (copy_from_user(&ctx, (struct drm_ctx __user *) arg, sizeof(ctx)))
1da177e4 LT	466	return -EFAULT;
1da177e4 LT	467
b5e89ed5 DA	468	DRM_DEBUG("%d\n", ctx.handle);
b5e89ed5 DA	469	drm_context_switch_complete(dev, ctx.handle);
1da177e4 LT	470
	471	return 0;
	472	}
	473
	474	/**
	475	* Remove context.
	476	*
	477	* \param inode device inode.
	478	* \param filp file pointer.
	479	* \param cmd command.
	480	* \param arg user argument pointing to a drm_ctx structure.
	481	* \return zero on success or a negative number on failure.
	482	*
	483	* If not the special kernel context, calls ctxbitmap_free() to free the specified context.
	484	*/
b5e89ed5 DA	485	int drm_rmctx(struct inode inode, struct file filp,
b5e89ed5 DA	486	unsigned int cmd, unsigned long arg)
1da177e4	487	{
84b1fd10 DA	488	struct drm_file *priv = filp->private_data;
84b1fd10 DA	489	struct drm_device *dev = priv->head->dev;
c60ce623	490	struct drm_ctx ctx;
1da177e4	491
c60ce623	492	if (copy_from_user(&ctx, (struct drm_ctx __user *) arg, sizeof(ctx)))
1da177e4 LT	493	return -EFAULT;
1da177e4 LT	494
b5e89ed5 DA	495	DRM_DEBUG("%d\n", ctx.handle);
b5e89ed5 DA	496	if (ctx.handle == DRM_KERNEL_CONTEXT + 1) {
1da177e4 LT	497	priv->remove_auth_on_close = 1;
1da177e4 LT	498	}
b5e89ed5	499	if (ctx.handle != DRM_KERNEL_CONTEXT) {
1da177e4 LT	500	if (dev->driver->context_dtor)
1da177e4 LT	501	dev->driver->context_dtor(dev, ctx.handle);
b5e89ed5	502	drm_ctxbitmap_free(dev, ctx.handle);
1da177e4 LT	503	}
1da177e4 LT	504
30e2fb18	505	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	506	if (!list_empty(&dev->ctxlist)) {
55910517	507	struct drm_ctx_list pos, n;
1da177e4	508
bd1b331f	509	list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
b5e89ed5 DA	510	if (pos->handle == ctx.handle) {
	511	list_del(&pos->head);
	512	drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
1da177e4 LT	513	--dev->ctx_count;
	514	}
	515	}
	516	}
30e2fb18	517	mutex_unlock(&dev->ctxlist_mutex);
1da177e4 LT	518
	519	return 0;
	520	}
	521
	522	/@}/