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sparc64: Add hypervisor interfaces for SPARC-T4 perf counter access.

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Unlike for previous chips, access to the perf-counter control
registers are all hyper-privileged.  Therefore, access to them must go
through a hypervisor interface.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-08-16 20:35:41 -07:00
parent 6f859c0e96
commit 8c79bfa511
3 changed files with 28 additions and 0 deletions
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11
arch/sparc/include/asm/hypervisor.h
View File

@ -2934,6 +2934,16 @@ extern unsigned long sun4v_reboot_data_set(unsigned long ra,
unsigned long len);
#endif
#define HV_FAST_VT_GET_PERFREG 0x184
#define HV_FAST_VT_SET_PERFREG 0x185
#ifndef __ASSEMBLY__
extern unsigned long sun4v_vt_get_perfreg(unsigned long reg_num,
unsigned long *reg_val);
extern unsigned long sun4v_vt_set_perfreg(unsigned long reg_num,
unsigned long reg_val);
#endif
/* Function numbers for HV_CORE_TRAP. */
#define HV_CORE_SET_VER 0x00
#define HV_CORE_PUTCHAR 0x01
@ -2964,6 +2974,7 @@ extern unsigned long sun4v_reboot_data_set(unsigned long ra,
#define HV_GRP_NIU 0x0204
#define HV_GRP_VF_CPU 0x0205
#define HV_GRP_KT_CPU 0x0209
#define HV_GRP_VT_CPU 0x020c
#define HV_GRP_DIAG 0x0300
#ifndef __ASSEMBLY__

1
arch/sparc/kernel/hvapi.c
View File

@ -45,6 +45,7 @@ static struct api_info api_table[] = {
{ .group = HV_GRP_NIU, },
{ .group = HV_GRP_VF_CPU, },
{ .group = HV_GRP_KT_CPU, },
{ .group = HV_GRP_VT_CPU, },
{ .group = HV_GRP_DIAG, .flags = FLAG_PRE_API },
};

16
arch/sparc/kernel/hvcalls.S
View File

@ -805,3 +805,19 @@ ENTRY(sun4v_reboot_data_set)
retl
nop
ENDPROC(sun4v_reboot_data_set)
ENTRY(sun4v_vt_get_perfreg)
mov %o1, %o4
mov HV_FAST_VT_GET_PERFREG, %o5
ta HV_FAST_TRAP
stx %o1, [%o4]
retl
nop
ENDPROC(sun4v_vt_get_perfreg)
ENTRY(sun4v_vt_set_perfreg)
mov HV_FAST_VT_SET_PERFREG, %o5
ta HV_FAST_TRAP
retl
nop
ENDPROC(sun4v_vt_set_perfreg)