root/include/linux/devcoredump.h

INCLUDED FROM

DEFINITIONS

1. _devcd_free_sgtable
2. dev_coredumpv
3. dev_coredumpm
4. dev_coredumpsg

   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  */
  22 static 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
  55 void dev_coredumpv(struct device *dev, void *data, size_t datalen,
  56                    gfp_t gfp);
  57 
  58 void 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 
  64 void dev_coredumpsg(struct device *dev, struct scatterlist *table,
  65                     size_t datalen, gfp_t gfp);
  66 #else
  67 static inline void dev_coredumpv(struct device *dev, void *data,
  68                                  size_t datalen, gfp_t gfp)
  69 {
  70         vfree(data);
  71 }
  72 
  73 static inline void
  74 dev_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 
  83 static 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 */