| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright(c) 2015 Intel Deutschland GmbH |
| */ |
| #ifndef __DEVCOREDUMP_H |
| #define __DEVCOREDUMP_H |
| |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/vmalloc.h> |
| |
| #include <linux/scatterlist.h> |
| #include <linux/slab.h> |
| |
| /* |
| * _devcd_free_sgtable - free all the memory of the given scatterlist table |
| * (i.e. both pages and scatterlist instances) |
| * NOTE: if two tables allocated and chained using the sg_chain function then |
| * this function should be called only once on the first table |
| * @table: pointer to sg_table to free |
| */ |
| static inline void _devcd_free_sgtable(struct scatterlist *table) |
| { |
| int i; |
| struct page *page; |
| struct scatterlist *iter; |
| struct scatterlist *delete_iter; |
| |
| /* free pages */ |
| iter = table; |
| for_each_sg(table, iter, sg_nents(table), i) { |
| page = sg_page(iter); |
| if (page) |
| __free_page(page); |
| } |
| |
| /* then free all chained tables */ |
| iter = table; |
| delete_iter = table; /* always points on a head of a table */ |
| while (!sg_is_last(iter)) { |
| iter++; |
| if (sg_is_chain(iter)) { |
| iter = sg_chain_ptr(iter); |
| kfree(delete_iter); |
| delete_iter = iter; |
| } |
| } |
| |
| /* free the last table */ |
| kfree(delete_iter); |
| } |
| |
| |
| #ifdef CONFIG_DEV_COREDUMP |
| void dev_coredumpv(struct device *dev, void *data, size_t datalen, |
| gfp_t gfp); |
| |
| void dev_coredumpm(struct device *dev, struct module *owner, |
| void *data, size_t datalen, gfp_t gfp, |
| ssize_t (*read)(char *buffer, loff_t offset, size_t count, |
| void *data, size_t datalen), |
| void (*free)(void *data)); |
| |
| void dev_coredumpsg(struct device *dev, struct scatterlist *table, |
| size_t datalen, gfp_t gfp); |
| #else |
| static inline void dev_coredumpv(struct device *dev, void *data, |
| size_t datalen, gfp_t gfp) |
| { |
| vfree(data); |
| } |
| |
| static inline void |
| dev_coredumpm(struct device *dev, struct module *owner, |
| void *data, size_t datalen, gfp_t gfp, |
| ssize_t (*read)(char *buffer, loff_t offset, size_t count, |
| void *data, size_t datalen), |
| void (*free)(void *data)) |
| { |
| free(data); |
| } |
| |
| static inline void dev_coredumpsg(struct device *dev, struct scatterlist *table, |
| size_t datalen, gfp_t gfp) |
| { |
| _devcd_free_sgtable(table); |
| } |
| #endif /* CONFIG_DEV_COREDUMP */ |
| |
| #endif /* __DEVCOREDUMP_H */ |