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>

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)