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1// SPDX-License-Identifier: GPL-2.0
2
3#ifndef _DRM_MANAGED_H_
4#define _DRM_MANAGED_H_
5
6#include <linux/gfp.h>
7#include <linux/overflow.h>
8#include <linux/types.h>
9
10struct drm_device;
11struct mutex;
12
13typedef void (*drmres_release_t)(struct drm_device *dev, void *res);
14
15/**
16 * drmm_add_action - add a managed release action to a &drm_device
17 * @dev: DRM device
18 * @action: function which should be called when @dev is released
19 * @data: opaque pointer, passed to @action
20 *
21 * This function adds the release @action with optional parameter @data to the
22 * list of cleanup actions for @dev. The cleanup actions will be run in reverse
23 * order in the final drm_dev_put() call for @dev.
24 */
25#define drmm_add_action(dev, action, data) \
26 __drmm_add_action(dev, action, data, #action)
27
28int __must_check __drmm_add_action(struct drm_device *dev,
29 drmres_release_t action,
30 void *data, const char *name);
31
32/**
33 * drmm_add_action_or_reset - add a managed release action to a &drm_device
34 * @dev: DRM device
35 * @action: function which should be called when @dev is released
36 * @data: opaque pointer, passed to @action
37 *
38 * Similar to drmm_add_action(), with the only difference that upon failure
39 * @action is directly called for any cleanup work necessary on failures.
40 */
41#define drmm_add_action_or_reset(dev, action, data) \
42 __drmm_add_action_or_reset(dev, action, data, #action)
43
44int __must_check __drmm_add_action_or_reset(struct drm_device *dev,
45 drmres_release_t action,
46 void *data, const char *name);
47
48void drmm_release_action(struct drm_device *dev,
49 drmres_release_t action,
50 void *data);
51
52void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp) __malloc;
53
54/**
55 * drmm_kzalloc - &drm_device managed kzalloc()
56 * @dev: DRM device
57 * @size: size of the memory allocation
58 * @gfp: GFP allocation flags
59 *
60 * This is a &drm_device managed version of kzalloc(). The allocated memory is
61 * automatically freed on the final drm_dev_put(). Memory can also be freed
62 * before the final drm_dev_put() by calling drmm_kfree().
63 */
64static inline void *drmm_kzalloc(struct drm_device *dev, size_t size, gfp_t gfp)
65{
66 return drmm_kmalloc(dev, size, gfp | __GFP_ZERO);
67}
68
69/**
70 * drmm_kmalloc_array - &drm_device managed kmalloc_array()
71 * @dev: DRM device
72 * @n: number of array elements to allocate
73 * @size: size of array member
74 * @flags: GFP allocation flags
75 *
76 * This is a &drm_device managed version of kmalloc_array(). The allocated
77 * memory is automatically freed on the final drm_dev_put() and works exactly
78 * like a memory allocation obtained by drmm_kmalloc().
79 */
80static inline void *drmm_kmalloc_array(struct drm_device *dev,
81 size_t n, size_t size, gfp_t flags)
82{
83 size_t bytes;
84
85 if (unlikely(check_mul_overflow(n, size, &bytes)))
86 return NULL;
87
88 return drmm_kmalloc(dev, bytes, flags);
89}
90
91/**
92 * drmm_kcalloc - &drm_device managed kcalloc()
93 * @dev: DRM device
94 * @n: number of array elements to allocate
95 * @size: size of array member
96 * @flags: GFP allocation flags
97 *
98 * This is a &drm_device managed version of kcalloc(). The allocated memory is
99 * automatically freed on the final drm_dev_put() and works exactly like a
100 * memory allocation obtained by drmm_kmalloc().
101 */
102static inline void *drmm_kcalloc(struct drm_device *dev,
103 size_t n, size_t size, gfp_t flags)
104{
105 return drmm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
106}
107
108char *drmm_kstrdup(struct drm_device *dev, const char *s, gfp_t gfp);
109
110void drmm_kfree(struct drm_device *dev, void *data);
111
112void __drmm_mutex_release(struct drm_device *dev, void *res);
113
114/**
115 * drmm_mutex_init - &drm_device-managed mutex_init()
116 * @dev: DRM device
117 * @lock: lock to be initialized
118 *
119 * Returns:
120 * 0 on success, or a negative errno code otherwise.
121 *
122 * This is a &drm_device-managed version of mutex_init(). The initialized
123 * lock is automatically destroyed on the final drm_dev_put().
124 */
125#define drmm_mutex_init(dev, lock) ({ \
126 mutex_init(lock); \
127 drmm_add_action_or_reset(dev, __drmm_mutex_release, lock); \
128}) \
129
130void __drmm_workqueue_release(struct drm_device *device, void *wq);
131
132/**
133 * drmm_alloc_ordered_workqueue - &drm_device managed alloc_ordered_workqueue()
134 * @dev: DRM device
135 * @fmt: printf format for the name of the workqueue
136 * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
137 * @args: args for @fmt
138 *
139 * This is a &drm_device-managed version of alloc_ordered_workqueue(). The
140 * allocated workqueue is automatically destroyed on the final drm_dev_put().
141 *
142 * Returns: workqueue on success, negative ERR_PTR otherwise.
143 */
144#define drmm_alloc_ordered_workqueue(dev, fmt, flags, args...) \
145 ({ \
146 struct workqueue_struct *wq = alloc_ordered_workqueue(fmt, flags, ##args); \
147 wq ? ({ \
148 int ret = drmm_add_action_or_reset(dev, __drmm_workqueue_release, wq); \
149 ret ? ERR_PTR(ret) : wq; \
150 }) : ERR_PTR(-ENOMEM); \
151 })
152
153#endif