cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/drm_global.c

Directory: drivers/gpu/drm
/**************************************************************************
 *
 * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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.
 *
 **************************************************************************/
/*
 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */

#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <drm/drm_global.h>


struct drm_global_item {
	
struct mutex mutex;
	
void *object;
	
int refcount;
};


static struct drm_global_item glob[DRM_GLOBAL_NUM];


void drm_global_init(void) { int i; for (i = 0; i < DRM_GLOBAL_NUM; ++i) { struct drm_global_item *item = &glob[i]; mutex_init(&item->mutex); item->object = NULL; item->refcount = 0; } }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Hellstrom5394.64%150.00%
Dave Airlie35.36%150.00%
Total56100.00%2100.00%


void drm_global_release(void) { int i; for (i = 0; i < DRM_GLOBAL_NUM; ++i) { struct drm_global_item *item = &glob[i]; BUG_ON(item->object != NULL); BUG_ON(item->refcount != 0); } }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Hellstrom5194.44%150.00%
Dave Airlie35.56%150.00%
Total54100.00%2100.00%

/** * drm_global_item_ref - Initialize and acquire reference to memory * object * @ref: Object for initialization * * This initializes a memory object, allocating memory and calling the * .init() hook. Further calls will increase the reference count for * that item. * * Returns: * Zero on success, non-zero otherwise. */
int drm_global_item_ref(struct drm_global_reference *ref) { int ret = 0; struct drm_global_item *item = &glob[ref->global_type]; mutex_lock(&item->mutex); if (item->refcount == 0) { ref->object = kzalloc(ref->size, GFP_KERNEL); if (unlikely(ref->object == NULL)) { ret = -ENOMEM; goto error_unlock; } ret = ref->init(ref); if (unlikely(ret != 0)) goto error_free; item->object = ref->object; } else { ref->object = item->object; } ++item->refcount; mutex_unlock(&item->mutex); return 0; error_free: kfree(ref->object); ref->object = NULL; error_unlock: mutex_unlock(&item->mutex); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Hellstrom12676.83%250.00%
Huang Rui3521.34%125.00%
Dave Airlie31.83%125.00%
Total164100.00%4100.00%

EXPORT_SYMBOL(drm_global_item_ref); /** * drm_global_item_unref - Drop reference to memory * object * @ref: Object being removed * * Drop a reference to the memory object and eventually call the * release() hook. The allocated object should be dropped in the * release() hook or before calling this function * */
void drm_global_item_unref(struct drm_global_reference *ref) { struct drm_global_item *item = &glob[ref->global_type]; mutex_lock(&item->mutex); BUG_ON(item->refcount == 0); BUG_ON(ref->object != item->object); if (--item->refcount == 0) { ref->release(ref); item->object = NULL; } mutex_unlock(&item->mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Hellstrom8096.39%150.00%
Dave Airlie33.61%150.00%
Total83100.00%2100.00%

EXPORT_SYMBOL(drm_global_item_unref);

Overall Contributors

PersonTokensPropCommitsCommitProp
Thomas Hellstrom34985.75%233.33%
Huang Rui358.60%116.67%
Dave Airlie204.91%116.67%
Gabriel Krisman Bertazi20.49%116.67%
David Howells10.25%116.67%
Total407100.00%6100.00%
Directory: drivers/gpu/drm
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