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pstore/ram: Add kern-doc for struct persistent_ram_zone

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

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2018-11-01 15:11:47 -07:00
parent dc80b1ea4c
commit c208f7d4b0
2 changed files with 53 additions and 3 deletions
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10
fs/pstore/ram_core.c
View File

@ -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;

46
include/linux/pstore_ram.h
View File

@ -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;
u32 flags;
raw_spinlock_t buffer_lock;
struct persistent_ram_buffer *buffer;
size_t buffer_size;
u32 flags;
raw_spinlock_t buffer_lock;
/* ECC correction */
char *par_buffer;
char *par_header;
struct rs_control *rs_decoder;