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pstore/ram: Clarify resource reservation labels

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When ramoops reserved a memory region in the kernel, it had an unhelpful
label of "persistent_memory". When reading /proc/iomem, it would be
repeated many times, did not hint that it was ramoops in particular,
and didn't clarify very much about what each was used for:

400000000-407ffffff : Persistent Memory (legacy)
  400000000-400000fff : persistent_memory
  400001000-400001fff : persistent_memory
...
  4000ff000-4000fffff : persistent_memory

Instead, this adds meaningful labels for how the various regions are
being used:

400000000-407ffffff : Persistent Memory (legacy)
  400000000-400000fff : ramoops:dump(0/252)
  400001000-400001fff : ramoops:dump(1/252)
...
  4000fc000-4000fcfff : ramoops:dump(252/252)
  4000fd000-4000fdfff : ramoops:console
  4000fe000-4000fe3ff : ramoops:ftrace(0/3)
  4000fe400-4000fe7ff : ramoops:ftrace(1/3)
  4000fe800-4000febff : ramoops:ftrace(2/3)
  4000fec00-4000fefff : ramoops:ftrace(3/3)
  4000ff000-4000fffff : ramoops:pmsg

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Tested-by: Guenter Roeck <groeck@chromium.org>
This commit is contained in:
Kees Cook 2018-10-17 17:20:35 -07:00
parent 95047b0519
commit 1227daa43b
3 changed files with 22 additions and 8 deletions
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3
include/linux/pstore_ram.h
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@ -46,6 +46,7 @@ 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;
@ -65,7 +66,7 @@ struct persistent_ram_zone {
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, u32 flags);
unsigned int memtype, u32 flags, char *label);
void persistent_ram_free(struct persistent_ram_zone *prz);
void persistent_ram_zap(struct persistent_ram_zone *prz);