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s390/diag: add diag26c support

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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>
This commit is contained in:
Julian Wiedmann
2017-06-20 16:00:33 +02:00
committed by David S. Miller
parent 3cdc8a2529
commit 1b03047816
2 changed files with 55 additions and 0 deletions
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29
arch/s390/kernel/diag.c
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@@ -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);