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https://github.com/edk2-porting/linux-next.git
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522566376a
Add scatterlist support (dev_coredumpsg) to allow drivers to avoid vmalloc() like dev_coredumpm(), while also avoiding the module reference that the latter function requires. This internally uses dev_coredumpm() with function inside the devcoredump module, requiring removing the const (which touches the driver using it.) Signed-off-by: Aviya Erenfeld <aviya.erenfeld@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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* This file is provided under the GPLv2 license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2015 Intel Deutschland GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution
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* in the file called COPYING.
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*/
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#ifndef __DEVCOREDUMP_H
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#define __DEVCOREDUMP_H
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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/*
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* _devcd_free_sgtable - free all the memory of the given scatterlist table
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* (i.e. both pages and scatterlist instances)
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* NOTE: if two tables allocated and chained using the sg_chain function then
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* this function should be called only once on the first table
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* @table: pointer to sg_table to free
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*/
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static inline void _devcd_free_sgtable(struct scatterlist *table)
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{
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int i;
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struct page *page;
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struct scatterlist *iter;
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struct scatterlist *delete_iter;
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/* free pages */
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iter = table;
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for_each_sg(table, iter, sg_nents(table), i) {
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page = sg_page(iter);
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if (page)
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__free_page(page);
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}
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/* then free all chained tables */
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iter = table;
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delete_iter = table; /* always points on a head of a table */
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while (!sg_is_last(iter)) {
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iter++;
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if (sg_is_chain(iter)) {
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iter = sg_chain_ptr(iter);
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kfree(delete_iter);
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delete_iter = iter;
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}
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}
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/* free the last table */
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kfree(delete_iter);
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}
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#ifdef CONFIG_DEV_COREDUMP
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void dev_coredumpv(struct device *dev, void *data, size_t datalen,
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gfp_t gfp);
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void dev_coredumpm(struct device *dev, struct module *owner,
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void *data, size_t datalen, gfp_t gfp,
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ssize_t (*read)(char *buffer, loff_t offset, size_t count,
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void *data, size_t datalen),
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void (*free)(void *data));
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void dev_coredumpsg(struct device *dev, struct scatterlist *table,
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size_t datalen, gfp_t gfp);
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#else
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static inline void dev_coredumpv(struct device *dev, void *data,
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size_t datalen, gfp_t gfp)
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{
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vfree(data);
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}
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static inline void
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dev_coredumpm(struct device *dev, struct module *owner,
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void *data, size_t datalen, gfp_t gfp,
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ssize_t (*read)(char *buffer, loff_t offset, size_t count,
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void *data, size_t datalen),
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void (*free)(void *data))
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{
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free(data);
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}
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static inline void dev_coredumpsg(struct device *dev, struct scatterlist *table,
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size_t datalen, gfp_t gfp)
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{
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_devcd_free_sgtable(table);
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}
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#endif /* CONFIG_DEV_COREDUMP */
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#endif /* __DEVCOREDUMP_H */
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