Release 4.11 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_LEGACY))
		return;

	mutex_lock(&dev->struct_mutex);
	idr_remove(&dev->ctx_idr, ctx_handle);
	mutex_unlock(&dev->struct_mutex);
}

Contributors
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Peter Antoine
17
29.31%
1
12.50%
Linus Torvalds (pre-git)
15
25.86%
1
12.50%
Linus Torvalds
12
20.69%
1
12.50%
Dave Airlie
11
18.97%
3
37.50%
Daniel Vetter
2
3.45%
1
12.50%
David Herrmann
1
1.72%
1
12.50%
Total
58
100.00%
8
100.00%

/**
 * 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;
}

Contributors
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CommitProp
Dave Airlie
16
31.37%
4
40.00%
Linus Torvalds (pre-git)
14
27.45%
1
10.00%
Linus Torvalds
13
25.49%
2
20.00%
Tejun Heo
4
7.84%
1
10.00%
Ville Syrjälä
3
5.88%
1
10.00%
David Herrmann
1
1.96%
1
10.00%
Total
51
100.00%
10
100.00%

/**
 * 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_LEGACY))
		return;

	idr_init(&dev->ctx_idr);
}

Contributors
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Peter Antoine
16
43.24%
1
14.29%
Linus Torvalds
12
32.43%
1
14.29%
Daniel Vetter
4
10.81%
2
28.57%
Dave Airlie
4
10.81%
2
28.57%
David Herrmann
1
2.70%
1
14.29%
Total
37
100.00%
7
100.00%

/**
 * 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_LEGACY))
		return;

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

Contributors
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CommitProp
Peter Antoine
17
32.08%
1
11.11%
Linus Torvalds
14
26.42%
1
11.11%
Linus Torvalds (pre-git)
10
18.87%
1
11.11%
Dave Airlie
8
15.09%
3
33.33%
Daniel Vetter
2
3.77%
1
11.11%
Tejun Heo
1
1.89%
1
11.11%
David Herrmann
1
1.89%
1
11.11%
Total
53
100.00%
9
100.00%

/**
 * 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_LEGACY))
		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);
}

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David Herrmann
110
85.27%
2
50.00%
Peter Antoine
17
13.18%
1
25.00%
Daniel Vetter
2
1.55%
1
25.00%
Total
129
100.00%
4
100.00%

/*@}*/

/******************************************************************/
/** \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_LEGACY))
		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;
}

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Dave Airlie
72
43.64%
9
45.00%
Linus Torvalds
35
21.21%
2
10.00%
Peter Antoine
20
12.12%
1
5.00%
Eric Anholt
14
8.48%
2
10.00%
Linus Torvalds (pre-git)
11
6.67%
1
5.00%
Ilija Hadzic
8
4.85%
1
5.00%
Daniel Vetter
2
1.21%
1
5.00%
David Herrmann
1
0.61%
1
5.00%
Al Viro
1
0.61%
1
5.00%
Benjamin Herrenschmidt
1
0.61%
1
5.00%
Total
165
100.00%
20
100.00%

/**
 * 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_LEGACY))
		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;
}

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Linus Torvalds
48
29.27%
4
21.05%
Linus Torvalds (pre-git)
47
28.66%
1
5.26%
Dave Airlie
32
19.51%
8
42.11%
Peter Antoine
20
12.20%
1
5.26%
Eric Anholt
13
7.93%
2
10.53%
Daniel Vetter
2
1.22%
1
5.26%
Benjamin Herrenschmidt
1
0.61%
1
5.26%
David Herrmann
1
0.61%
1
5.26%
Total
164
100.00%
19
100.00%

/*@}*/

/******************************************************************/
/** \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;
}

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Linus Torvalds
56
74.67%
2
33.33%
Linus Torvalds (pre-git)
15
20.00%
1
16.67%
Dave Airlie
4
5.33%
3
50.00%
Total
75
100.00%
6
100.00%

/**
 * 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;
}

Contributors
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Linus Torvalds
32
50.79%
1
14.29%
Linus Torvalds (pre-git)
18
28.57%
1
14.29%
Dave Airlie
13
20.63%
5
71.43%
Total
63
100.00%
7
100.00%

/**
 * 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_LEGACY))
		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;
}

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Linus Torvalds
61
45.86%
1
10.00%
Linus Torvalds (pre-git)
27
20.30%
1
10.00%
Peter Antoine
20
15.04%
1
10.00%
Eric Anholt
13
9.77%
2
20.00%
Dave Airlie
6
4.51%
2
20.00%
Al Viro
3
2.26%
1
10.00%
Daniel Vetter
2
1.50%
1
10.00%
David Herrmann
1
0.75%
1
10.00%
Total
133
100.00%
10
100.00%

/**
 * 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_LEGACY))
		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;
}

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Dave Airlie
83
42.56%
5
38.46%
Linus Torvalds
65
33.33%
1
7.69%
Peter Antoine
20
10.26%
1
7.69%
Eric Anholt
19
9.74%
3
23.08%
Al Viro
3
1.54%
1
7.69%
David Herrmann
3
1.54%
1
7.69%
Daniel Vetter
2
1.03%
1
7.69%
Total
195
100.00%
13
100.00%

/**
 * 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_LEGACY))
		return -EINVAL;

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

	return 0;
}

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CommitProp
Linus Torvalds
21
36.21%
1
12.50%
Peter Antoine
20
34.48%
1
12.50%
Eric Anholt
11
18.97%
2
25.00%
Dave Airlie
2
3.45%
1
12.50%
Daniel Vetter
2
3.45%
1
12.50%
David Herrmann
1
1.72%
1
12.50%
Al Viro
1
1.72%
1
12.50%
Total
58
100.00%
8
100.00%

/**
 * 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_LEGACY))
		return -EINVAL;

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

Contributors
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CommitProp
Linus Torvalds
32
45.07%
1
11.11%
Peter Antoine
20
28.17%
1
11.11%
Eric Anholt
13
18.31%
2
22.22%
Dave Airlie
3
4.23%
3
33.33%
Daniel Vetter
2
2.82%
1
11.11%
David Herrmann
1
1.41%
1
11.11%
Total
71
100.00%
9
100.00%

/**
 * 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_LEGACY))
		return -EINVAL;

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

	return 0;
}

Contributors
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Tokens
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CommitProp
Linus Torvalds
26
36.62%
1
10.00%
Peter Antoine
20
28.17%
1
10.00%
Eric Anholt
13
18.31%
2
20.00%
Dave Airlie
9
12.68%
4
40.00%
Daniel Vetter
2
2.82%
1
10.00%
David Herrmann
1
1.41%
1
10.00%
Total
71
100.00%
10
100.00%

/**
 * 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_LEGACY))
		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;
}

Contributors
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Tokens
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Commits
CommitProp
Dave Airlie
93
53.45%
9
52.94%
Linus Torvalds
40
22.99%
2
11.76%
Peter Antoine
20
11.49%
1
5.88%
Eric Anholt
17
9.77%
3
17.65%
Daniel Vetter
2
1.15%
1
5.88%
David Herrmann
2
1.15%
1
5.88%
Total
174
100.00%
17
100.00%

/*@}*/
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
478
30.88%
7
16.67%
Dave Airlie
363
23.45%
19
45.24%
Peter Antoine
227
14.66%
1
2.38%
Linus Torvalds (pre-git)
159
10.27%
1
2.38%
David Herrmann
147
9.50%
2
4.76%
Eric Anholt
121
7.82%
3
7.14%
Daniel Vetter
26
1.68%
2
4.76%
Ilija Hadzic
8
0.52%
1
2.38%
Al Viro
8
0.52%
1
2.38%
Tejun Heo
5
0.32%
2
4.76%
Ville Syrjälä
3
0.19%
1
2.38%
Benjamin Herrenschmidt
2
0.13%
1
2.38%
David Howells
1
0.06%
1
2.38%
Total
1548
100.00%
42
100.00%
Directory: drivers/gpu/drm

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