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authorDavid S. Miller <davem@davemloft.net>2012-08-16 20:35:41 -0700
committerDavid S. Miller <davem@davemloft.net>2012-08-18 23:03:53 -0700
commit8c79bfa51101354853f0f5d3b02435cec429da51 (patch)
tree412a66bd5885179b65a957956ad7978b6bada7f4
parent6f859c0e96f0737a543610a189d12420c569110f (diff)
sparc64: Add hypervisor interfaces for SPARC-T4 perf counter access.
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>
-rw-r--r--arch/sparc/include/asm/hypervisor.h11
-rw-r--r--arch/sparc/kernel/hvapi.c1
-rw-r--r--arch/sparc/kernel/hvcalls.S16
3 files changed, 28 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/hypervisor.h b/arch/sparc/include/asm/hypervisor.h
index 015a761eaa32..ca121f0fa3ec 100644
--- a/arch/sparc/include/asm/hypervisor.h
+++ b/arch/sparc/include/asm/hypervisor.h
@@ -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__
diff --git a/arch/sparc/kernel/hvapi.c b/arch/sparc/kernel/hvapi.c
index 8593672838fd..1032df43ec95 100644
--- a/arch/sparc/kernel/hvapi.c
+++ b/arch/sparc/kernel/hvapi.c
@@ -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 },
};
diff --git a/arch/sparc/kernel/hvcalls.S b/arch/sparc/kernel/hvcalls.S
index 58d60de4d65b..f3ab509b76a8 100644
--- a/arch/sparc/kernel/hvcalls.S
+++ b/arch/sparc/kernel/hvcalls.S
@@ -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)