1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright(c) 2015 Intel Deutschland GmbH
4 */
5#ifndef __DEVCOREDUMP_H
6#define __DEVCOREDUMP_H
7
8#include <linux/device.h>
9#include <linux/module.h>
10#include <linux/vmalloc.h>
11
12#include <linux/scatterlist.h>
13#include <linux/slab.h>
14
15/*
16 * _devcd_free_sgtable - free all the memory of the given scatterlist table
17 * (i.e. both pages and scatterlist instances)
18 * NOTE: if two tables allocated and chained using the sg_chain function then
19 * this function should be called only once on the first table
20 * @table: pointer to sg_table to free
21 */
22static inline void _devcd_free_sgtable(struct scatterlist *table)
23{
24 int i;
25 struct page *page;
26 struct scatterlist *iter;
27 struct scatterlist *delete_iter;
28
29 /* free pages */
30 iter = table;
31 for_each_sg(table, iter, sg_nents(table), i) {
32 page = sg_page(iter);
33 if (page)
34 __free_page(page);
35 }
36
37 /* then free all chained tables */
38 iter = table;
39 delete_iter = table; /* always points on a head of a table */
40 while (!sg_is_last(iter)) {
41 iter++;
42 if (sg_is_chain(iter)) {
43 iter = sg_chain_ptr(iter);
44 kfree(delete_iter);
45 delete_iter = iter;
46 }
47 }
48
49 /* free the last table */
50 kfree(delete_iter);
51}
52
53
54#ifdef CONFIG_DEV_COREDUMP
55void dev_coredumpv(struct device *dev, void *data, size_t datalen,
56 gfp_t gfp);
57
58void dev_coredumpm(struct device *dev, struct module *owner,
59 void *data, size_t datalen, gfp_t gfp,
60 ssize_t (*read)(char *buffer, loff_t offset, size_t count,
61 void *data, size_t datalen),
62 void (*free)(void *data));
63
64void dev_coredumpsg(struct device *dev, struct scatterlist *table,
65 size_t datalen, gfp_t gfp);
66#else
67static inline void dev_coredumpv(struct device *dev, void *data,
68 size_t datalen, gfp_t gfp)
69{
70 vfree(data);
71}
72
73static inline void
74dev_coredumpm(struct device *dev, struct module *owner,
75 void *data, size_t datalen, gfp_t gfp,
76 ssize_t (*read)(char *buffer, loff_t offset, size_t count,
77 void *data, size_t datalen),
78 void (*free)(void *data))
79{
80 free(data);
81}
82
83static inline void dev_coredumpsg(struct device *dev, struct scatterlist *table,
84 size_t datalen, gfp_t gfp)
85{
86 _devcd_free_sgtable(table);
87}
88#endif /* CONFIG_DEV_COREDUMP */
89
90#endif /* __DEVCOREDUMP_H */
91

source code of linux/include/linux/devcoredump.h