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| author |   Julian Wiedmann <jwi@linux.vnet.ibm.com> | 2017-06-20 16:00:33 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-06-20 15:44:15 -0400 |
| commit | 1b030478166cdbdffe9bcffadc32558b4b511869 (patch) | |
| tree | 08206f6e31555f7e043c13ff5224dbe7f60cef4e /arch/s390/kernel/diag.c | |
| parent | s390/qeth: fix packing buffer statistics (diff) | |
| download | linux-dev-1b030478166cdbdffe9bcffadc32558b4b511869.tar.xz linux-dev-1b030478166cdbdffe9bcffadc32558b4b511869.zip | |
s390/diag: add diag26c support
Implement support for the hypervisor diagnose 0x26c
('Access Certain System Information').
It passes a request buffer and a subfunction code, and receives
a response buffer and a return code.
Also add the scaffolding for the 'MAC Services' subfunction.
It may be used by network devices to obtain a hypervisor-managed
MAC address.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | arch/s390/kernel/diag.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c index ac6abcd3fe6a..349914571772 100644 --- a/arch/s390/kernel/diag.c +++ b/arch/s390/kernel/diag.c @@ -38,6 +38,7 @@ static const struct diag_desc diag_map[NR_DIAG_STAT] = { [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, + [DIAG_STAT_X26C] = { .code = 0x26c, .name = "Certain System Information" }, [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, @@ -236,3 +237,31 @@ int diag224(void *ptr) return rc; } EXPORT_SYMBOL(diag224); + +/* + * Diagnose 26C: Access Certain System Information + */ +static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode) +{ + register unsigned long _req asm("2") = (addr_t) req; + register unsigned long _resp asm("3") = (addr_t) resp; + register unsigned long _subcode asm("4") = subcode; + register unsigned long _rc asm("5") = -EOPNOTSUPP; + + asm volatile( + " sam31\n" + " diag %[rx],%[ry],0x26c\n" + "0: sam64\n" + EX_TABLE(0b,0b) + : "+d" (_rc) + : [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode) + : "cc", "memory"); + return _rc; +} + +int diag26c(void *req, void *resp, enum diag26c_sc subcode) +{ + diag_stat_inc(DIAG_STAT_X26C); + return __diag26c(req, resp, subcode); +} +EXPORT_SYMBOL(diag26c); |