diff options
Diffstat (limited to 'include/linux/devcoredump.h')
-rw-r--r-- | include/linux/devcoredump.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/include/linux/devcoredump.h b/include/linux/devcoredump.h new file mode 100644 index 000000000..c008169ed --- /dev/null +++ b/include/linux/devcoredump.h @@ -0,0 +1,90 @@ +/* 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 */ |