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author | Markus Pargmann <mpa@pengutronix.de> | 2015-12-08 10:39:32 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-12-10 08:49:52 +0100 |
commit | 160d2ed0ba18b5d849ecc98dfde25e350928e7b8 (patch) | |
tree | b2fe1c487732571f7f2cd241e12ad19c910c9340 /include/linux/pstore_ram.h | |
parent | 6c42710ae03bd642f68220dea4dac60b6cbd6d23 (diff) | |
download | barebox-160d2ed0ba18b5d849ecc98dfde25e350928e7b8.tar.gz barebox-160d2ed0ba18b5d849ecc98dfde25e350928e7b8.tar.xz |
fs: Add pstore filesystem
pstore is a persistent storage filesystem used for RAMOOPS. It is used
to store console logs, panics, ftrace and other information in case of a
crash/panic/oops/reboot.
pstore is implemented for barebox as a read-only filesystem at the
moment. It may be extended later on. The idea is to provide a way to
extract essential data from the last running kernel.
Most of the code is copied from the kernel. However this is only a
lightweight implementation without real write support yet.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/linux/pstore_ram.h')
-rw-r--r-- | include/linux/pstore_ram.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h new file mode 100644 index 0000000000..5ef823a57b --- /dev/null +++ b/include/linux/pstore_ram.h @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> + * Copyright (C) 2011 Kees Cook <keescook@chromium.org> + * Copyright (C) 2011 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + */ + +#ifndef __LINUX_PSTORE_RAM_H__ +#define __LINUX_PSTORE_RAM_H__ + +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/types.h> + +struct persistent_ram_buffer; +struct rs_control; + +struct persistent_ram_ecc_info { + int block_size; + int ecc_size; + int symsize; + int poly; +}; + +struct persistent_ram_zone { + phys_addr_t paddr; + size_t size; + struct persistent_ram_buffer *buffer; + size_t buffer_size; + struct resource *res; + + /* ECC correction */ + char *par_buffer; + char *par_header; + struct rs_control *rs_decoder; + int corrected_bytes; + int bad_blocks; + struct persistent_ram_ecc_info ecc_info; + + char *old_log; + size_t old_log_size; +}; + +struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, + u32 sig, struct persistent_ram_ecc_info *ecc_info, + unsigned int memtype); +void persistent_ram_free(struct persistent_ram_zone *prz); +void persistent_ram_zap(struct persistent_ram_zone *prz); + +int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, + unsigned int count); + +void persistent_ram_save_old(struct persistent_ram_zone *prz); +size_t persistent_ram_old_size(struct persistent_ram_zone *prz); +void *persistent_ram_old(struct persistent_ram_zone *prz); +void persistent_ram_free_old(struct persistent_ram_zone *prz); +ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, + char *str, size_t len); + +/* + * Ramoops platform data + * @mem_size memory size for ramoops + * @mem_address physical memory address to contain ramoops + */ + +struct ramoops_platform_data { + unsigned long mem_size; + unsigned long mem_address; + unsigned int mem_type; + unsigned long record_size; + unsigned long console_size; + unsigned long ftrace_size; + unsigned long pmsg_size; + int dump_oops; + struct persistent_ram_ecc_info ecc_info; +}; + +#endif |