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Commit c208f7d4 authored by Kees Cook's avatar Kees Cook
Browse files

pstore/ram: Add kern-doc for struct persistent_ram_zone 



The struct persistent_ram_zone wasn't well documented. This adds kern-doc
for it.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent dc80b1ea

fs/pstore/ram_core.c

+10 −0
Original line number Diff line number Diff line
@@ -29,6 +29,16 @@ 
#include <linux/vmalloc.h>

#include <asm/page.h>



/**

 * struct persistent_ram_buffer - persistent circular RAM buffer

 *

 * @sig:

 *	signature to indicate header (PERSISTENT_RAM_SIG xor PRZ-type value)

 * @start:

 *	offset into @data where the beginning of the stored bytes begin

 * @size:

 *	number of valid bytes stored in @data

 */

struct persistent_ram_buffer {

	uint32_t    sig;

	atomic_t    start;

include/linux/pstore_ram.h

+43 −3
Original line number Diff line number Diff line
@@ -30,6 +30,10 @@ 
 * PRZ_FLAG_NO_LOCK is used. For all other cases, locking is required.

 */

#define PRZ_FLAG_NO_LOCK	BIT(0)

/*

 * If a PRZ should only have a single-boot lifetime, this marks it as

 * getting wiped after its contents get copied out after boot.

 */

#define PRZ_FLAG_ZAP_OLD	BIT(1)



struct persistent_ram_buffer;
@@ -43,17 +47,53 @@ struct persistent_ram_ecc_info { 
	uint16_t *par;

};



/**

 * struct persistent_ram_zone - Details of a persistent RAM zone (PRZ)

 *                              used as a pstore backend

 *

 * @paddr:	physical address of the mapped RAM area

 * @size:	size of mapping

 * @label:	unique name of this PRZ

 * @flags:	holds PRZ_FLAGS_* bits

 *

 * @buffer_lock:

 *	locks access to @buffer "size" bytes and "start" offset

 * @buffer:

 *	pointer to actual RAM area managed by this PRZ

 * @buffer_size:

 *	bytes in @buffer->data (not including any trailing ECC bytes)

 *

 * @par_buffer:

 *	pointer into @buffer->data containing ECC bytes for @buffer->data

 * @par_header:

 *	pointer into @buffer->data containing ECC bytes for @buffer header

 *	(i.e. all fields up to @data)

 * @rs_decoder:

 *	RSLIB instance for doing ECC calculations

 * @corrected_bytes:

 *	ECC corrected bytes accounting since boot

 * @bad_blocks:

 *	ECC uncorrectable bytes accounting since boot

 * @ecc_info:

 *	ECC configuration details

 *

 * @old_log:

 *	saved copy of @buffer->data prior to most recent wipe

 * @old_log_size:

 *	bytes contained in @old_log

 *

 */

struct persistent_ram_zone {

	phys_addr_t paddr;

	size_t size;

	void *vaddr;

	char *label;

	struct persistent_ram_buffer *buffer;

	size_t buffer_size;

	u32 flags;



	raw_spinlock_t buffer_lock;

	struct persistent_ram_buffer *buffer;

	size_t buffer_size;



	/* ECC correction */

	char *par_buffer;

	char *par_header;

	struct rs_control *rs_decoder;