/* * This file is provided under the GPLv2 license. * * GPL LICENSE SUMMARY * * Copyright(c) 2015 Intel Deutschland GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * The full GNU General Public License is included in this distribution * in the file called COPYING. */ #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 */