diff options
| author | Jesse Barnes <jbarnes@sgi.com> | 2004-09-29 16:58:05 +0000 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2004-09-29 16:58:05 +0000 |
| commit | dfde87852fe81d04cb8e3c6287d79027784ee60d (patch) | |
| tree | 922df8e4cda483fad49f9d356766e9c0454f5103 /include | |
| parent | 970c091b3aa90cecf670327f2053be294a99a33a (diff) | |
[IA64-SGI] sn2: serialize access to PROM chips
If we read and write the PROM chips at the same time, as might happen at boot
when salinfo extracts MCA records and a user is checking the PROM revision
in /proc/sgi_prominfo, an MCA might occur, since the PROM chips can't be
accessed that way. This patch fixes the problem for systems with new PROMs
(>= 3.50) by using the SAL to do PROM reads.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-ia64/sn/sn_sal.h | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/include/asm-ia64/sn/sn_sal.h b/include/asm-ia64/sn/sn_sal.h index 5a0490b4cda1..3d3d324a229a 100644 --- a/include/asm-ia64/sn/sn_sal.h +++ b/include/asm-ia64/sn/sn_sal.h @@ -34,6 +34,7 @@ #define SN_SAL_NO_FAULT_ZONE_PHYSICAL 0x02000011 #define SN_SAL_PRINT_ERROR 0x02000012 #define SN_SAL_SET_ERROR_HANDLING_FEATURES 0x0200001a // reentrant +#define SN_SAL_GET_FIT_COMPT 0x0200001b // reentrant #define SN_SAL_CONSOLE_PUTC 0x02000021 #define SN_SAL_CONSOLE_GETC 0x02000022 #define SN_SAL_CONSOLE_PUTS 0x02000023 @@ -107,12 +108,13 @@ /* - * SN_SAL_GET_PARTITION_ADDR return constants + * SAL Error Codes */ #define SALRET_MORE_PASSES 1 #define SALRET_OK 0 -#define SALRET_INVALID_ARG -2 -#define SALRET_ERROR -3 +#define SALRET_NOT_IMPLEMENTED (-1) +#define SALRET_INVALID_ARG (-2) +#define SALRET_ERROR (-3) /* * SN_SAL_SET_ERROR_HANDLING_FEATURES bit settings @@ -829,6 +831,34 @@ ia64_sn_irtr_intr_disable(nasid_t nasid, int subch, u64 intr) return (int) rv.v0; } +/** + * ia64_sn_get_fit_compt - read a FIT entry from the PROM header + * @nasid: NASID of node to read + * @index: FIT entry index to be retrieved (0..n) + * @fitentry: 16 byte buffer where FIT entry will be stored. + * @banbuf: optional buffer for retrieving banner + * @banlen: length of banner buffer + * + * Access to the physical PROM chips needs to be serialized since reads and + * writes can't occur at the same time, so we need to call into the SAL when + * we want to look at the FIT entries on the chips. + * + * Returns: + * %SALRET_OK if ok + * %SALRET_INVALID_ARG if index too big + * %SALRET_NOT_IMPLEMENTED if running on older PROM + * ??? if nasid invalid OR banner buffer not large enough + */ +static inline int +ia64_sn_get_fit_compt(u64 nasid, u64 index, void *fitentry, void *banbuf, + u64 banlen) +{ + struct ia64_sal_retval rv; + SAL_CALL_NOLOCK(rv, SN_SAL_GET_FIT_COMPT, nasid, index, fitentry, + banbuf, banlen, 0, 0); + return (int) rv.status; +} + /* * Initialize the SAL components of the system controller * communication driver; specifically pass in a sizable buffer that |