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-rw-r--r--include/linux/backport-devcoredump.h105
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diff --git a/include/linux/backport-devcoredump.h b/include/linux/backport-devcoredump.h
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+++ b/include/linux/backport-devcoredump.h
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+/*
+ * 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 CPTCFG_BPAUTO_WANT_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 /* CPTCFG_BPAUTO_WANT_DEV_COREDUMP */
+
+#endif /* __DEVCOREDUMP_H */