[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
 */
void 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;

	idr_init(&dev->ctx_idr);
}

/**
 * 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	*/
ba6976c1	92	void drm_legacy_ctxbitmap_init(struct drm_device * dev)
1da177e4	93	{
0e975980 PA	94	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
0e975980 PA	95	drm_core_check_feature(dev, DRIVER_MODESET))
ba6976c1	96	return;
0e975980	97
62968144	98	idr_init(&dev->ctx_idr);
1da177e4 LT	99	}
	100
	101	/**
	102	* Context bitmap cleanup.
	103	*
	104	* \param dev DRM device.
	105	*
62968144 DA	106	* Free all idr members using drm_ctx_sarea_free helper function
62968144 DA	107	* while holding the drm_device::struct_mutex lock.
1da177e4	108	*/
e7b96070	109	void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev)
1da177e4	110	{
0e975980 PA	111	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	112	drm_core_check_feature(dev, DRIVER_MODESET))
	113	return;
	114
30e2fb18	115	mutex_lock(&dev->struct_mutex);
4d53233a	116	idr_destroy(&dev->ctx_idr);
30e2fb18	117	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	118	}
1da177e4 LT	119
9f8d21ea DH	120	/**
	121	* drm_ctxbitmap_flush() - Flush all contexts owned by a file
	122	* @dev: DRM device to operate on
	123	* @file: Open file to flush contexts for
	124	*
	125	* This iterates over all contexts on @dev and drops them if they're owned by
	126	* @file. Note that after this call returns, new contexts might be added if
	127	* the file is still alive.
	128	*/
e7b96070	129	void drm_legacy_ctxbitmap_flush(struct drm_device dev, struct drm_file file)
9f8d21ea DH	130	{
	131	struct drm_ctx_list pos, tmp;
	132
0e975980 PA	133	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	134	drm_core_check_feature(dev, DRIVER_MODESET))
	135	return;
	136
9f8d21ea DH	137	mutex_lock(&dev->ctxlist_mutex);
	138
	139	list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) {
	140	if (pos->tag == file &&
	141	pos->handle != DRM_KERNEL_CONTEXT) {
	142	if (dev->driver->context_dtor)
	143	dev->driver->context_dtor(dev, pos->handle);
	144
e7b96070	145	drm_legacy_ctxbitmap_free(dev, pos->handle);
9f8d21ea DH	146	list_del(&pos->head);
	147	kfree(pos);
	148	}
	149	}
	150
	151	mutex_unlock(&dev->ctxlist_mutex);
	152	}
	153
1da177e4 LT	154	/@}/
	155
	156	/******************************************************************/
	157	/** \name Per Context SAREA Support */
	158	/@{/
	159
	160	/**
	161	* Get per-context SAREA.
b5e89ed5	162	*
1da177e4	163	* \param inode device inode.
6c340eac	164	* \param file_priv DRM file private.
1da177e4 LT	165	* \param cmd command.
	166	* \param arg user argument pointing to a drm_ctx_priv_map structure.
	167	* \return zero on success or a negative number on failure.
	168	*
62968144	169	* Gets the map from drm_device::ctx_idr with the handle specified and
1da177e4 LT	170	* returns its handle.
1da177e4 LT	171	*/
e7b96070 DH	172	int drm_legacy_getsareactx(struct drm_device dev, void data,
e7b96070 DH	173	struct drm_file *file_priv)
1da177e4	174	{
c153f45f	175	struct drm_ctx_priv_map *request = data;
f77d390c	176	struct drm_local_map *map;
55910517	177	struct drm_map_list *_entry;
1da177e4	178
0e975980 PA	179	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	180	drm_core_check_feature(dev, DRIVER_MODESET))
	181	return -EINVAL;
	182
30e2fb18	183	mutex_lock(&dev->struct_mutex);
62968144	184
c153f45f	185	map = idr_find(&dev->ctx_idr, request->ctx_id);
62968144	186	if (!map) {
30e2fb18	187	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	188	return -EINVAL;
	189	}
	190
c153f45f	191	request->handle = NULL;
bd1b331f	192	list_for_each_entry(_entry, &dev->maplist, head) {
d1f2b55a	193	if (_entry->map == map) {
bc5f4523	194	request->handle =
b5e89ed5	195	(void *)(unsigned long)_entry->user_token;
d1f2b55a DA	196	break;
	197	}
	198	}
09b4ea47 IH	199
	200	mutex_unlock(&dev->struct_mutex);
	201
c153f45f	202	if (request->handle == NULL)
d1f2b55a DA	203	return -EINVAL;
d1f2b55a DA	204
1da177e4 LT	205	return 0;
	206	}
	207
	208	/**
	209	* Set per-context SAREA.
b5e89ed5	210	*
1da177e4	211	* \param inode device inode.
6c340eac	212	* \param file_priv DRM file private.
1da177e4 LT	213	* \param cmd command.
	214	* \param arg user argument pointing to a drm_ctx_priv_map structure.
	215	* \return zero on success or a negative number on failure.
	216	*
	217	* Searches the mapping specified in \p arg and update the entry in
62968144	218	* drm_device::ctx_idr with it.
1da177e4	219	*/
e7b96070 DH	220	int drm_legacy_setsareactx(struct drm_device dev, void data,
e7b96070 DH	221	struct drm_file *file_priv)
1da177e4	222	{
c153f45f	223	struct drm_ctx_priv_map *request = data;
f77d390c	224	struct drm_local_map *map = NULL;
55910517	225	struct drm_map_list *r_list = NULL;
1da177e4	226
0e975980 PA	227	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	228	drm_core_check_feature(dev, DRIVER_MODESET))
	229	return -EINVAL;
	230
30e2fb18	231	mutex_lock(&dev->struct_mutex);
bd1b331f	232	list_for_each_entry(r_list, &dev->maplist, head) {
9a186645	233	if (r_list->map
c153f45f	234	&& r_list->user_token == (unsigned long) request->handle)
1da177e4 LT	235	goto found;
1da177e4 LT	236	}
b5e89ed5	237	bad:
30e2fb18	238	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	239	return -EINVAL;
1da177e4 LT	240
b5e89ed5	241	found:
1da177e4	242	map = r_list->map;
b5e89ed5 DA	243	if (!map)
b5e89ed5 DA	244	goto bad;
62968144	245
c153f45f	246	if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
1da177e4	247	goto bad;
62968144	248
30e2fb18	249	mutex_unlock(&dev->struct_mutex);
c153f45f	250
1da177e4 LT	251	return 0;
	252	}
	253
	254	/@}/
	255
	256	/******************************************************************/
	257	/** \name The actual DRM context handling routines */
	258	/@{/
	259
	260	/**
	261	* Switch context.
	262	*
	263	* \param dev DRM device.
	264	* \param old old context handle.
	265	* \param new new context handle.
	266	* \return zero on success or a negative number on failure.
	267	*
	268	* Attempt to set drm_device::context_flag.
	269	*/
84b1fd10	270	static int drm_context_switch(struct drm_device * dev, int old, int new)
1da177e4	271	{
b5e89ed5 DA	272	if (test_and_set_bit(0, &dev->context_flag)) {
	273	DRM_ERROR("Reentering -- FIXME\n");
	274	return -EBUSY;
	275	}
1da177e4	276
b5e89ed5	277	DRM_DEBUG("Context switch from %d to %d\n", old, new);
1da177e4	278
b5e89ed5 DA	279	if (new == dev->last_context) {
	280	clear_bit(0, &dev->context_flag);
	281	return 0;
	282	}
1da177e4	283
b5e89ed5	284	return 0;
1da177e4 LT	285	}
	286
	287	/**
	288	* Complete context switch.
	289	*
	290	* \param dev DRM device.
	291	* \param new new context handle.
	292	* \return zero on success or a negative number on failure.
	293	*
	294	* Updates drm_device::last_context and drm_device::last_switch. Verifies the
	295	* hardware lock is held, clears the drm_device::context_flag and wakes up
	296	* drm_device::context_wait.
	297	*/
7c1c2871 DA	298	static int drm_context_switch_complete(struct drm_device *dev,
7c1c2871 DA	299	struct drm_file *file_priv, int new)
1da177e4	300	{
b5e89ed5	301	dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
1da177e4	302
7c1c2871	303	if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
b5e89ed5 DA	304	DRM_ERROR("Lock isn't held after context switch\n");
b5e89ed5 DA	305	}
1da177e4	306
b5e89ed5 DA	307	/* If a context switch is ever initiated
	308	when the kernel holds the lock, release
	309	that lock here. */
	310	clear_bit(0, &dev->context_flag);
1da177e4	311
b5e89ed5	312	return 0;
1da177e4 LT	313	}
	314
	315	/**
	316	* Reserve contexts.
	317	*
	318	* \param inode device inode.
6c340eac	319	* \param file_priv DRM file private.
1da177e4 LT	320	* \param cmd command.
	321	* \param arg user argument pointing to a drm_ctx_res structure.
	322	* \return zero on success or a negative number on failure.
	323	*/
e7b96070 DH	324	int drm_legacy_resctx(struct drm_device dev, void data,
e7b96070 DH	325	struct drm_file *file_priv)
1da177e4	326	{
c153f45f	327	struct drm_ctx_res *res = data;
c60ce623	328	struct drm_ctx ctx;
1da177e4 LT	329	int i;
1da177e4 LT	330
0e975980 PA	331	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	332	drm_core_check_feature(dev, DRIVER_MODESET))
	333	return -EINVAL;
	334
c153f45f	335	if (res->count >= DRM_RESERVED_CONTEXTS) {
b5e89ed5 DA	336	memset(&ctx, 0, sizeof(ctx));
b5e89ed5 DA	337	for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
1da177e4	338	ctx.handle = i;
c153f45f	339	if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
1da177e4 LT	340	return -EFAULT;
	341	}
	342	}
c153f45f	343	res->count = DRM_RESERVED_CONTEXTS;
1da177e4	344
1da177e4 LT	345	return 0;
	346	}
	347
	348	/**
	349	* Add context.
	350	*
	351	* \param inode device inode.
6c340eac	352	* \param file_priv DRM file private.
1da177e4 LT	353	* \param cmd command.
	354	* \param arg user argument pointing to a drm_ctx structure.
	355	* \return zero on success or a negative number on failure.
	356	*
	357	* Get a new handle for the context and copy to userspace.
	358	*/
e7b96070 DH	359	int drm_legacy_addctx(struct drm_device dev, void data,
e7b96070 DH	360	struct drm_file *file_priv)
1da177e4	361	{
55910517	362	struct drm_ctx_list *ctx_entry;
c153f45f	363	struct drm_ctx *ctx = data;
1da177e4	364
0e975980 PA	365	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	366	drm_core_check_feature(dev, DRIVER_MODESET))
	367	return -EINVAL;
	368
e7b96070	369	ctx->handle = drm_legacy_ctxbitmap_next(dev);
c153f45f	370	if (ctx->handle == DRM_KERNEL_CONTEXT) {
b5e89ed5	371	/* Skip kernel's context and get a new one. */
e7b96070	372	ctx->handle = drm_legacy_ctxbitmap_next(dev);
1da177e4	373	}
c153f45f EA	374	DRM_DEBUG("%d\n", ctx->handle);
c153f45f EA	375	if (ctx->handle == -1) {
b5e89ed5 DA	376	DRM_DEBUG("Not enough free contexts.\n");
b5e89ed5 DA	377	/* Should this return -EBUSY instead? */
1da177e4 LT	378	return -ENOMEM;
	379	}
	380
9a298b2a	381	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
b5e89ed5	382	if (!ctx_entry) {
1da177e4 LT	383	DRM_DEBUG("out of memory\n");
	384	return -ENOMEM;
	385	}
	386
b5e89ed5	387	INIT_LIST_HEAD(&ctx_entry->head);
c153f45f	388	ctx_entry->handle = ctx->handle;
6c340eac	389	ctx_entry->tag = file_priv;
1da177e4	390
30e2fb18	391	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	392	list_add(&ctx_entry->head, &dev->ctxlist);
30e2fb18	393	mutex_unlock(&dev->ctxlist_mutex);
1da177e4	394
1da177e4 LT	395	return 0;
	396	}
	397
1da177e4 LT	398	/**
	399	* Get context.
	400	*
	401	* \param inode device inode.
6c340eac	402	* \param file_priv DRM file private.
1da177e4 LT	403	* \param cmd command.
	404	* \param arg user argument pointing to a drm_ctx structure.
	405	* \return zero on success or a negative number on failure.
	406	*/
e7b96070 DH	407	int drm_legacy_getctx(struct drm_device dev, void data,
e7b96070 DH	408	struct drm_file *file_priv)
1da177e4	409	{
c153f45f	410	struct drm_ctx *ctx = data;
1da177e4	411
0e975980 PA	412	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	413	drm_core_check_feature(dev, DRIVER_MODESET))
	414	return -EINVAL;
	415
1da177e4	416	/* This is 0, because we don't handle any context flags */
c153f45f	417	ctx->flags = 0;
1da177e4	418
1da177e4 LT	419	return 0;
	420	}
	421
	422	/**
	423	* Switch context.
	424	*
	425	* \param inode device inode.
6c340eac	426	* \param file_priv DRM file private.
1da177e4 LT	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	*/
e7b96070 DH	433	int drm_legacy_switchctx(struct drm_device dev, void data,
e7b96070 DH	434	struct drm_file *file_priv)
1da177e4	435	{
c153f45f	436	struct drm_ctx *ctx = data;
1da177e4	437
0e975980 PA	438	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	439	drm_core_check_feature(dev, DRIVER_MODESET))
	440	return -EINVAL;
	441
c153f45f EA	442	DRM_DEBUG("%d\n", ctx->handle);
c153f45f EA	443	return drm_context_switch(dev, dev->last_context, ctx->handle);
1da177e4 LT	444	}
	445
	446	/**
	447	* New context.
	448	*
	449	* \param inode device inode.
6c340eac	450	* \param file_priv DRM file private.
1da177e4 LT	451	* \param cmd command.
	452	* \param arg user argument pointing to a drm_ctx structure.
	453	* \return zero on success or a negative number on failure.
	454	*
	455	* Calls context_switch_complete().
	456	*/
e7b96070 DH	457	int drm_legacy_newctx(struct drm_device dev, void data,
e7b96070 DH	458	struct drm_file *file_priv)
1da177e4	459	{
c153f45f	460	struct drm_ctx *ctx = data;
1da177e4	461
0e975980 PA	462	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	463	drm_core_check_feature(dev, DRIVER_MODESET))
	464	return -EINVAL;
	465
c153f45f	466	DRM_DEBUG("%d\n", ctx->handle);
7c1c2871	467	drm_context_switch_complete(dev, file_priv, ctx->handle);
1da177e4 LT	468
	469	return 0;
	470	}
	471
	472	/**
	473	* Remove context.
	474	*
	475	* \param inode device inode.
6c340eac	476	* \param file_priv DRM file private.
1da177e4 LT	477	* \param cmd command.
	478	* \param arg user argument pointing to a drm_ctx structure.
	479	* \return zero on success or a negative number on failure.
	480	*
	481	* If not the special kernel context, calls ctxbitmap_free() to free the specified context.
	482	*/
e7b96070 DH	483	int drm_legacy_rmctx(struct drm_device dev, void data,
e7b96070 DH	484	struct drm_file *file_priv)
1da177e4	485	{
c153f45f	486	struct drm_ctx *ctx = data;
1da177e4	487
0e975980 PA	488	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
	489	drm_core_check_feature(dev, DRIVER_MODESET))
	490	return -EINVAL;
	491
c153f45f	492	DRM_DEBUG("%d\n", ctx->handle);
c153f45f	493	if (ctx->handle != DRM_KERNEL_CONTEXT) {
1da177e4	494	if (dev->driver->context_dtor)
c153f45f	495	dev->driver->context_dtor(dev, ctx->handle);
e7b96070	496	drm_legacy_ctxbitmap_free(dev, ctx->handle);
1da177e4 LT	497	}
1da177e4 LT	498
30e2fb18	499	mutex_lock(&dev->ctxlist_mutex);
bd1b331f	500	if (!list_empty(&dev->ctxlist)) {
55910517	501	struct drm_ctx_list pos, n;
1da177e4	502
bd1b331f	503	list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
c153f45f	504	if (pos->handle == ctx->handle) {
b5e89ed5	505	list_del(&pos->head);
9a298b2a	506	kfree(pos);
1da177e4 LT	507	}
	508	}
	509	}
30e2fb18	510	mutex_unlock(&dev->ctxlist_mutex);
1da177e4 LT	511
	512	return 0;
	513	}
	514
	515	/@}/