[linux-2.6-block.git] / drivers / gpu / drm / drm_context.c

/*
 * Legacy: Generic DRM Contexts
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
 * Author: Gareth Hughes <gareth@valinux.com>
 *
 * 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.
 */

#include <drm/drmP.h>
#include "drm_legacy.h"

struct drm_ctx_list {
	struct list_head head;
	drm_context_t handle;
	struct drm_file *tag;
};

/******************************************************************/
/** \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_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
{
	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return;

	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_legacy_ctxbitmap_next(struct drm_device * dev)
{
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0,
			GFP_KERNEL);
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

/**
 * Context bitmap initialization.
 *
 * \param dev DRM device.
 *
 * Initialise the drm_device::ctx_idr
 */
int drm_legacy_ctxbitmap_init(struct drm_device * dev)
{
	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	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_legacy_ctxbitmap_cleanup(struct drm_device * dev)
{
	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return;

	mutex_lock(&dev->struct_mutex);
	idr_destroy(&dev->ctx_idr);
	mutex_unlock(&dev->struct_mutex);
}

/**
 * drm_ctxbitmap_flush() - Flush all contexts owned by a file
 * @dev: DRM device to operate on
 * @file: Open file to flush contexts for
 *
 * This iterates over all contexts on @dev and drops them if they're owned by
 * @file. Note that after this call returns, new contexts might be added if
 * the file is still alive.
 */
void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file)
{
	struct drm_ctx_list *pos, *tmp;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return;

	mutex_lock(&dev->ctxlist_mutex);

	list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) {
		if (pos->tag == file &&
		    pos->handle != DRM_KERNEL_CONTEXT) {
			if (dev->driver->context_dtor)
				dev->driver->context_dtor(dev, pos->handle);

			drm_legacy_ctxbitmap_free(dev, pos->handle);
			list_del(&pos->head);
			kfree(pos);
		}
	}

	mutex_unlock(&dev->ctxlist_mutex);
}

/*@}*/

/******************************************************************/
/** \name Per Context SAREA Support */
/*@{*/

/**
 * Get per-context SAREA.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_getsareactx(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct drm_ctx_priv_map *request = data;
	struct drm_local_map *map;
	struct drm_map_list *_entry;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	mutex_lock(&dev->struct_mutex);

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

	request->handle = NULL;
	list_for_each_entry(_entry, &dev->maplist, head) {
		if (_entry->map == map) {
			request->handle =
			    (void *)(unsigned long)_entry->user_token;
			break;
		}
	}

	mutex_unlock(&dev->struct_mutex);

	if (request->handle == NULL)
		return -EINVAL;

	return 0;
}

/**
 * Set per-context SAREA.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_setsareactx(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct drm_ctx_priv_map *request = data;
	struct drm_local_map *map = NULL;
	struct drm_map_list *r_list = NULL;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	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,
				       struct drm_file *file_priv, int new)
{
	dev->last_context = new;	/* PRE/POST: This is the _only_ writer. */

	if (!_DRM_LOCK_IS_HELD(file_priv->master->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;
}

/**
 * Reserve contexts.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_resctx(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct drm_ctx_res *res = data;
	struct drm_ctx ctx;
	int i;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	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;

	return 0;
}

/**
 * Add context.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_addctx(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct drm_ctx_list *ctx_entry;
	struct drm_ctx *ctx = data;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	ctx->handle = drm_legacy_ctxbitmap_next(dev);
	if (ctx->handle == DRM_KERNEL_CONTEXT) {
		/* Skip kernel's context and get a new one. */
		ctx->handle = drm_legacy_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;
	}

	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
	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 = file_priv;

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

	return 0;
}

/**
 * Get context.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_getctx(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct drm_ctx *ctx = data;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	/* This is 0, because we don't handle any context flags */
	ctx->flags = 0;

	return 0;
}

/**
 * Switch context.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_switchctx(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	struct drm_ctx *ctx = data;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	DRM_DEBUG("%d\n", ctx->handle);
	return drm_context_switch(dev, dev->last_context, ctx->handle);
}

/**
 * New context.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_newctx(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct drm_ctx *ctx = data;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	DRM_DEBUG("%d\n", ctx->handle);
	drm_context_switch_complete(dev, file_priv, ctx->handle);

	return 0;
}

/**
 * Remove context.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \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_legacy_rmctx(struct drm_device *dev, void *data,
		     struct drm_file *file_priv)
{
	struct drm_ctx *ctx = data;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	    drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	DRM_DEBUG("%d\n", ctx->handle);
	if (ctx->handle != DRM_KERNEL_CONTEXT) {
		if (dev->driver->context_dtor)
			dev->driver->context_dtor(dev, ctx->handle);
		drm_legacy_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);
				kfree(pos);
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	return 0;
}

/*@}*/
Commit	Line	Data
1da177e4	1	/*
e7b96070	2	* Legacy: Generic DRM Contexts
1da177e4 LT	3	*
	4	* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
	5	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	6	* All Rights Reserved.
	7	*
e7b96070 DH	8	* Author: Rickard E. (Rik) Faith <faith@valinux.com>
	9	* Author: Gareth Hughes <gareth@valinux.com>
	10	*
1da177e4 LT	11	* Permission is hereby granted, free of charge, to any person obtaining a
	12	* copy of this software and associated documentation files (the "Software"),
	13	* to deal in the Software without restriction, including without limitation
	14	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	15	* and/or sell copies of the Software, and to permit persons to whom the
	16	* Software is furnished to do so, subject to the following conditions:
	17	*
	18	* The above copyright notice and this permission notice (including the next
	19	* paragraph) shall be included in all copies or substantial portions of the
	20	* Software.
	21	*
	22	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	23	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	24	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	25	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	26	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	27	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	28	* OTHER DEALINGS IN THE SOFTWARE.
	29	*/
	30
760285e7	31	#include <drm/drmP.h>
e7b96070 DH	32	#include "drm_legacy.h"
	33
	34	struct drm_ctx_list {
	35	struct list_head head;
	36	drm_context_t handle;
	37	struct drm_file *tag;
	38	};
1da177e4	39
c21eb21c DA	40	/******************************************************************/
	41	/** \name Context bitmap support */
	42	/@{/
	43
1da177e4 LT	44	/**
	45	* Free a handle from the context bitmap.
	46	*
	47	* \param dev DRM device.
	48	* \param ctx_handle context handle.
	49	*
	50	* Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
62968144	51	* in drm_device::ctx_idr, while holding the drm_device::struct_mutex
1da177e4 LT	52	* lock.
1da177e4 LT	53	*/
e7b96070	54	void drm_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
1da177e4	55	{
0e975980 PA	56	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	57	drm_core_check_feature(dev, DRIVER_MODESET))
	58	return;
	59
62968144 DA	60	mutex_lock(&dev->struct_mutex);
	61	idr_remove(&dev->ctx_idr, ctx_handle);
	62	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	63	}
1da177e4 LT	64
b5e89ed5	65	/**
1da177e4 LT	66	* Context bitmap allocation.
	67	*
	68	* \param dev DRM device.
	69	* \return (non-negative) context handle on success or a negative number on failure.
	70	*
62968144	71	* Allocate a new idr from drm_device::ctx_idr while holding the
30e2fb18	72	* drm_device::struct_mutex lock.
1da177e4	73	*/
e7b96070	74	static int drm_legacy_ctxbitmap_next(struct drm_device * dev)
1da177e4	75	{
62968144	76	int ret;
1da177e4	77
30e2fb18	78	mutex_lock(&dev->struct_mutex);
2e928815 TH	79	ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0,
2e928815 TH	80	GFP_KERNEL);
30e2fb18	81	mutex_unlock(&dev->struct_mutex);
2e928815	82	return ret;
1da177e4 LT	83	}
	84
	85	/**
	86	* Context bitmap initialization.
	87	*
	88	* \param dev DRM device.
	89	*
62968144	90	* Initialise the drm_device::ctx_idr
1da177e4	91	*/
e7b96070	92	int drm_legacy_ctxbitmap_init(struct drm_device * dev)
1da177e4	93	{
0e975980 PA	94	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	95	drm_core_check_feature(dev, DRIVER_MODESET))
	96	return -EINVAL;
	97
62968144	98	idr_init(&dev->ctx_idr);
c21eb21c	99	return 0;
1da177e4 LT	100	}
	101
	102	/**
	103	* Context bitmap cleanup.
	104	*
	105	* \param dev DRM device.
	106	*
62968144 DA	107	* Free all idr members using drm_ctx_sarea_free helper function
62968144 DA	108	* while holding the drm_device::struct_mutex lock.
1da177e4	109	*/
e7b96070	110	void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev)
1da177e4	111	{
0e975980 PA	112	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	113	drm_core_check_feature(dev, DRIVER_MODESET))
	114	return;
	115
30e2fb18	116	mutex_lock(&dev->struct_mutex);
4d53233a	117	idr_destroy(&dev->ctx_idr);
30e2fb18	118	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	119	}
1da177e4 LT	120
9f8d21ea DH	121	/**
	122	* drm_ctxbitmap_flush() - Flush all contexts owned by a file
	123	* @dev: DRM device to operate on
	124	* @file: Open file to flush contexts for
	125	*
	126	* This iterates over all contexts on @dev and drops them if they're owned by
	127	* @file. Note that after this call returns, new contexts might be added if
	128	* the file is still alive.
	129	*/
e7b96070	130	void drm_legacy_ctxbitmap_flush(struct drm_device dev, struct drm_file file)
9f8d21ea DH	131	{
	132	struct drm_ctx_list pos, tmp;
	133
0e975980 PA	134	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	135	drm_core_check_feature(dev, DRIVER_MODESET))
	136	return;
	137
9f8d21ea DH	138	mutex_lock(&dev->ctxlist_mutex);
	139
	140	list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) {
	141	if (pos->tag == file &&
	142	pos->handle != DRM_KERNEL_CONTEXT) {
	143	if (dev->driver->context_dtor)
	144	dev->driver->context_dtor(dev, pos->handle);
	145
e7b96070	146	drm_legacy_ctxbitmap_free(dev, pos->handle);
9f8d21ea DH	147	list_del(&pos->head);
	148	kfree(pos);
	149	}
	150	}
	151
	152	mutex_unlock(&dev->ctxlist_mutex);
	153	}
	154
1da177e4 LT	155	/@}/
	156
	157	/******************************************************************/
	158	/** \name Per Context SAREA Support */
	159	/@{/
	160
	161	/**
	162	* Get per-context SAREA.
b5e89ed5	163	*
1da177e4	164	* \param inode device inode.
6c340eac	165	* \param file_priv DRM file private.
1da177e4 LT	166	* \param cmd command.
	167	* \param arg user argument pointing to a drm_ctx_priv_map structure.
	168	* \return zero on success or a negative number on failure.
	169	*
62968144	170	* Gets the map from drm_device::ctx_idr with the handle specified and
1da177e4 LT	171	* returns its handle.
1da177e4 LT	172	*/
e7b96070 DH	173	int drm_legacy_getsareactx(struct drm_device dev, void data,
e7b96070 DH	174	struct drm_file *file_priv)
1da177e4	175	{
c153f45f	176	struct drm_ctx_priv_map *request = data;
f77d390c	177	struct drm_local_map *map;
55910517	178	struct drm_map_list *_entry;
1da177e4	179
0e975980 PA	180	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	181	drm_core_check_feature(dev, DRIVER_MODESET))
	182	return -EINVAL;
	183
30e2fb18	184	mutex_lock(&dev->struct_mutex);
62968144	185
c153f45f	186	map = idr_find(&dev->ctx_idr, request->ctx_id);
62968144	187	if (!map) {
30e2fb18	188	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	189	return -EINVAL;
	190	}
	191
c153f45f	192	request->handle = NULL;
bd1b331f	193	list_for_each_entry(_entry, &dev->maplist, head) {
d1f2b55a	194	if (_entry->map == map) {
bc5f4523	195	request->handle =
b5e89ed5	196	(void *)(unsigned long)_entry->user_token;
d1f2b55a DA	197	break;
	198	}
	199	}
09b4ea47 IH	200
	201	mutex_unlock(&dev->struct_mutex);
	202
c153f45f	203	if (request->handle == NULL)
d1f2b55a DA	204	return -EINVAL;
d1f2b55a DA	205
1da177e4 LT	206	return 0;
	207	}
	208
	209	/**
	210	* Set per-context SAREA.
b5e89ed5	211	*
1da177e4	212	* \param inode device inode.
6c340eac	213	* \param file_priv DRM file private.
1da177e4 LT	214	* \param cmd command.
	215	* \param arg user argument pointing to a drm_ctx_priv_map structure.
	216	* \return zero on success or a negative number on failure.
	217	*
	218	* Searches the mapping specified in \p arg and update the entry in
62968144	219	* drm_device::ctx_idr with it.
1da177e4	220	*/
e7b96070 DH	221	int drm_legacy_setsareactx(struct drm_device dev, void data,
e7b96070 DH	222	struct drm_file *file_priv)
1da177e4	223	{
c153f45f	224	struct drm_ctx_priv_map *request = data;
f77d390c	225	struct drm_local_map *map = NULL;
55910517	226	struct drm_map_list *r_list = NULL;
1da177e4	227
0e975980 PA	228	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	229	drm_core_check_feature(dev, DRIVER_MODESET))
	230	return -EINVAL;
	231
30e2fb18	232	mutex_lock(&dev->struct_mutex);
bd1b331f	233	list_for_each_entry(r_list, &dev->maplist, head) {
9a186645	234	if (r_list->map
c153f45f	235	&& r_list->user_token == (unsigned long) request->handle)
1da177e4 LT	236	goto found;
1da177e4 LT	237	}
b5e89ed5	238	bad:
30e2fb18	239	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	240	return -EINVAL;
1da177e4 LT	241
b5e89ed5	242	found:
1da177e4	243	map = r_list->map;
b5e89ed5 DA	244	if (!map)
b5e89ed5 DA	245	goto bad;
62968144	246
c153f45f	247	if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
1da177e4	248	goto bad;
62968144	249
30e2fb18	250	mutex_unlock(&dev->struct_mutex);
c153f45f	251
1da177e4 LT	252	return 0;
	253	}
	254
	255	/@}/
	256
	257	/******************************************************************/
	258	/** \name The actual DRM context handling routines */
	259	/@{/
	260
	261	/**
	262	* Switch context.
	263	*
	264	* \param dev DRM device.
	265	* \param old old context handle.
	266	* \param new new context handle.
	267	* \return zero on success or a negative number on failure.
	268	*
	269	* Attempt to set drm_device::context_flag.
	270	*/
84b1fd10	271	static int drm_context_switch(struct drm_device * dev, int old, int new)
1da177e4	272	{
b5e89ed5 DA	273	if (test_and_set_bit(0, &dev->context_flag)) {
	274	DRM_ERROR("Reentering -- FIXME\n");
	275	return -EBUSY;
	276	}
1da177e4	277
b5e89ed5	278	DRM_DEBUG("Context switch from %d to %d\n", old, new);
1da177e4	279
b5e89ed5 DA	280	if (new == dev->last_context) {
	281	clear_bit(0, &dev->context_flag);
	282	return 0;
	283	}
1da177e4	284
b5e89ed5	285	return 0;
1da177e4 LT	286	}
	287
	288	/**
	289	* Complete context switch.
	290	*
	291	* \param dev DRM device.
	292	* \param new new context handle.
	293	* \return zero on success or a negative number on failure.
	294	*
	295	* Updates drm_device::last_context and drm_device::last_switch. Verifies the
	296	* hardware lock is held, clears the drm_device::context_flag and wakes up
	297	* drm_device::context_wait.
	298	*/
7c1c2871 DA	299	static int drm_context_switch_complete(struct drm_device *dev,
7c1c2871 DA	300	struct drm_file *file_priv, int new)
1da177e4	301	{
b5e89ed5	302	dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
1da177e4	303
7c1c2871	304	if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
b5e89ed5 DA	305	DRM_ERROR("Lock isn't held after context switch\n");
b5e89ed5 DA	306	}
1da177e4	307
b5e89ed5 DA	308	/* If a context switch is ever initiated
	309	when the kernel holds the lock, release
	310	that lock here. */
	311	clear_bit(0, &dev->context_flag);
1da177e4	312
b5e89ed5	313	return 0;
1da177e4 LT	314	}
	315
	316	/**
	317	* Reserve contexts.
	318	*
	319	* \param inode device inode.
6c340eac	320	* \param file_priv DRM file private.
1da177e4 LT	321	* \param cmd command.
	322	* \param arg user argument pointing to a drm_ctx_res structure.
	323	* \return zero on success or a negative number on failure.
	324	*/
e7b96070 DH	325	int drm_legacy_resctx(struct drm_device dev, void data,
e7b96070 DH	326	struct drm_file *file_priv)
1da177e4	327	{
c153f45f	328	struct drm_ctx_res *res = data;
c60ce623	329	struct drm_ctx ctx;
1da177e4 LT	330	int i;
1da177e4 LT	331
0e975980 PA	332	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	333	drm_core_check_feature(dev, DRIVER_MODESET))
	334	return -EINVAL;
	335
c153f45f	336	if (res->count >= DRM_RESERVED_CONTEXTS) {
b5e89ed5 DA	337	memset(&ctx, 0, sizeof(ctx));
b5e89ed5 DA	338	for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
1da177e4	339	ctx.handle = i;
c153f45f	340	if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
1da177e4 LT	341	return -EFAULT;
	342	}
	343	}
c153f45f	344	res->count = DRM_RESERVED_CONTEXTS;
1da177e4	345
1da177e4 LT	346	return 0;
	347	}
	348
	349	/**
	350	* Add context.
	351	*
	352	* \param inode device inode.
6c340eac	353	* \param file_priv DRM file private.
1da177e4 LT	354	* \param cmd command.
	355	* \param arg user argument pointing to a drm_ctx structure.
	356	* \return zero on success or a negative number on failure.
	357	*
	358	* Get a new handle for the context and copy to userspace.
	359	*/
e7b96070 DH	360	int drm_legacy_addctx(struct drm_device dev, void data,
e7b96070 DH	361	struct drm_file *file_priv)
1da177e4	362	{
55910517	363	struct drm_ctx_list *ctx_entry;
c153f45f	364	struct drm_ctx *ctx = data;
1da177e4	365
0e975980 PA	366	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	367	drm_core_check_feature(dev, DRIVER_MODESET))
	368	return -EINVAL;
	369
e7b96070	370	ctx->handle = drm_legacy_ctxbitmap_next(dev);
c153f45f	371	if (ctx->handle == DRM_KERNEL_CONTEXT) {
b5e89ed5	372	/* Skip kernel's context and get a new one. */
e7b96070	373	ctx->handle = drm_legacy_ctxbitmap_next(dev);
1da177e4	374	}
c153f45f EA	375	DRM_DEBUG("%d\n", ctx->handle);
c153f45f EA	376	if (ctx->handle == -1) {
b5e89ed5 DA	377	DRM_DEBUG("Not enough free contexts.\n");
b5e89ed5 DA	378	/* Should this return -EBUSY instead? */
1da177e4 LT	379	return -ENOMEM;
	380	}
	381
9a298b2a	382	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
b5e89ed5	383	if (!ctx_entry) {
1da177e4 LT	384	DRM_DEBUG("out of memory\n");
	385	return -ENOMEM;
	386	}
	387
b5e89ed5	388	INIT_LIST_HEAD(&ctx_entry->head);
c153f45f	389	ctx_entry->handle = ctx->handle;
6c340eac	390	ctx_entry->tag = file_priv;
1da177e4	391
30e2fb18	392	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	393	list_add(&ctx_entry->head, &dev->ctxlist);
30e2fb18	394	mutex_unlock(&dev->ctxlist_mutex);
1da177e4	395
1da177e4 LT	396	return 0;
	397	}
	398
1da177e4 LT	399	/**
	400	* Get context.
	401	*
	402	* \param inode device inode.
6c340eac	403	* \param file_priv DRM file private.
1da177e4 LT	404	* \param cmd command.
	405	* \param arg user argument pointing to a drm_ctx structure.
	406	* \return zero on success or a negative number on failure.
	407	*/
e7b96070 DH	408	int drm_legacy_getctx(struct drm_device dev, void data,
e7b96070 DH	409	struct drm_file *file_priv)
1da177e4	410	{
c153f45f	411	struct drm_ctx *ctx = data;
1da177e4	412
0e975980 PA	413	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	414	drm_core_check_feature(dev, DRIVER_MODESET))
	415	return -EINVAL;
	416
1da177e4	417	/* This is 0, because we don't handle any context flags */
c153f45f	418	ctx->flags = 0;
1da177e4	419
1da177e4 LT	420	return 0;
	421	}
	422
	423	/**
	424	* Switch context.
	425	*
	426	* \param inode device inode.
6c340eac	427	* \param file_priv DRM file private.
1da177e4 LT	428	* \param cmd command.
	429	* \param arg user argument pointing to a drm_ctx structure.
	430	* \return zero on success or a negative number on failure.
	431	*
	432	* Calls context_switch().
	433	*/
e7b96070 DH	434	int drm_legacy_switchctx(struct drm_device dev, void data,
e7b96070 DH	435	struct drm_file *file_priv)
1da177e4	436	{
c153f45f	437	struct drm_ctx *ctx = data;
1da177e4	438
0e975980 PA	439	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	440	drm_core_check_feature(dev, DRIVER_MODESET))
	441	return -EINVAL;
	442
c153f45f EA	443	DRM_DEBUG("%d\n", ctx->handle);
c153f45f EA	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.
6c340eac	451	* \param file_priv DRM file private.
1da177e4 LT	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	*/
e7b96070 DH	458	int drm_legacy_newctx(struct drm_device dev, void data,
e7b96070 DH	459	struct drm_file *file_priv)
1da177e4	460	{
c153f45f	461	struct drm_ctx *ctx = data;
1da177e4	462
0e975980 PA	463	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	464	drm_core_check_feature(dev, DRIVER_MODESET))
	465	return -EINVAL;
	466
c153f45f	467	DRM_DEBUG("%d\n", ctx->handle);
7c1c2871	468	drm_context_switch_complete(dev, file_priv, ctx->handle);
1da177e4 LT	469
	470	return 0;
	471	}
	472
	473	/**
	474	* Remove context.
	475	*
	476	* \param inode device inode.
6c340eac	477	* \param file_priv DRM file private.
1da177e4 LT	478	* \param cmd command.
	479	* \param arg user argument pointing to a drm_ctx structure.
	480	* \return zero on success or a negative number on failure.
	481	*
	482	* If not the special kernel context, calls ctxbitmap_free() to free the specified context.
	483	*/
e7b96070 DH	484	int drm_legacy_rmctx(struct drm_device dev, void data,
e7b96070 DH	485	struct drm_file *file_priv)
1da177e4	486	{
c153f45f	487	struct drm_ctx *ctx = data;
1da177e4	488
0e975980 PA	489	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	490	drm_core_check_feature(dev, DRIVER_MODESET))
	491	return -EINVAL;
	492
c153f45f	493	DRM_DEBUG("%d\n", ctx->handle);
c153f45f	494	if (ctx->handle != DRM_KERNEL_CONTEXT) {
1da177e4	495	if (dev->driver->context_dtor)
c153f45f	496	dev->driver->context_dtor(dev, ctx->handle);
e7b96070	497	drm_legacy_ctxbitmap_free(dev, ctx->handle);
1da177e4 LT	498	}
1da177e4 LT	499
30e2fb18	500	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	501	if (!list_empty(&dev->ctxlist)) {
55910517	502	struct drm_ctx_list pos, n;
1da177e4	503
bd1b331f	504	list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
c153f45f	505	if (pos->handle == ctx->handle) {
b5e89ed5	506	list_del(&pos->head);
9a298b2a	507	kfree(pos);
1da177e4 LT	508	}
	509	}
	510	}
30e2fb18	511	mutex_unlock(&dev->ctxlist_mutex);
1da177e4 LT	512
	513	return 0;
	514	}
	515
	516	/@}/