Commit 1525fb3b authored by WeiXiong Liao's avatar WeiXiong Liao Committed by Kees Cook

pstore/blk: Provide way to query pstore configuration

In order to configure itself, the MTD backend needs to be able to query
the current pstore configuration. Introduce pstore_blk_get_config() for
this purpose.
Signed-off-by: default avatarWeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-9-keescook@chromium.org/Co-developed-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 335426c6
...@@ -94,6 +94,17 @@ struct bdev_info { ...@@ -94,6 +94,17 @@ struct bdev_info {
sector_t start_sect; sector_t start_sect;
}; };
#define check_size(name, alignsize) ({ \
long _##name_ = (name); \
_##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024); \
if (_##name_ & ((alignsize) - 1)) { \
pr_info(#name " must align to %d\n", \
(alignsize)); \
_##name_ = ALIGN(name, (alignsize)); \
} \
_##name_; \
})
/** /**
* struct pstore_device_info - back-end pstore/blk driver structure. * struct pstore_device_info - back-end pstore/blk driver structure.
* *
...@@ -149,13 +160,11 @@ static int psblk_register_do(struct pstore_device_info *dev) ...@@ -149,13 +160,11 @@ static int psblk_register_do(struct pstore_device_info *dev)
dev->flags = UINT_MAX; dev->flags = UINT_MAX;
#define verify_size(name, alignsize, enabled) { \ #define verify_size(name, alignsize, enabled) { \
long _##name_ = (enabled) ? (name) : 0; \ long _##name_; \
_##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024); \ if (enabled) \
if (_##name_ & ((alignsize) - 1)) { \ _##name_ = check_size(name, alignsize); \
pr_info(#name " must align to %d\n", \ else \
(alignsize)); \ _##name_ = 0; \
_##name_ = ALIGN(name, (alignsize)); \
} \
name = _##name_ / 1024; \ name = _##name_ / 1024; \
pstore_zone_info->name = _##name_; \ pstore_zone_info->name = _##name_; \
} }
...@@ -453,6 +462,20 @@ void unregister_pstore_blk(unsigned int major) ...@@ -453,6 +462,20 @@ void unregister_pstore_blk(unsigned int major)
} }
EXPORT_SYMBOL_GPL(unregister_pstore_blk); EXPORT_SYMBOL_GPL(unregister_pstore_blk);
/* get information of pstore/blk */
int pstore_blk_get_config(struct pstore_blk_config *info)
{
strncpy(info->device, blkdev, 80);
info->max_reason = max_reason;
info->kmsg_size = check_size(kmsg_size, 4096);
info->pmsg_size = check_size(pmsg_size, 4096);
info->ftrace_size = check_size(ftrace_size, 4096);
info->console_size = check_size(console_size, 4096);
return 0;
}
EXPORT_SYMBOL_GPL(pstore_blk_get_config);
static void __exit pstore_blk_exit(void) static void __exit pstore_blk_exit(void)
{ {
mutex_lock(&pstore_blk_lock); mutex_lock(&pstore_blk_lock);
......
...@@ -49,4 +49,32 @@ struct pstore_blk_info { ...@@ -49,4 +49,32 @@ struct pstore_blk_info {
int register_pstore_blk(struct pstore_blk_info *info); int register_pstore_blk(struct pstore_blk_info *info);
void unregister_pstore_blk(unsigned int major); void unregister_pstore_blk(unsigned int major);
/**
* struct pstore_blk_config - the pstore_blk backend configuration
*
* @device: Name of the desired block device
* @max_reason: Maximum kmsg dump reason to store to block device
* @kmsg_size: Total size of for kmsg dumps
* @pmsg_size: Total size of the pmsg storage area
* @console_size: Total size of the console storage area
* @ftrace_size: Total size for ftrace logging data (for all CPUs)
*/
struct pstore_blk_config {
char device[80];
enum kmsg_dump_reason max_reason;
unsigned long kmsg_size;
unsigned long pmsg_size;
unsigned long console_size;
unsigned long ftrace_size;
};
/**
* pstore_blk_get_config - get a copy of the pstore_blk backend configuration
*
* @info: The sturct pstore_blk_config to be filled in
*
* Failure returns negative error code, and success returns 0.
*/
int pstore_blk_get_config(struct pstore_blk_config *info);
#endif #endif
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment