[SPARC64]: Provide mmu statistics via sysfs.

If the system supports hypervisor based statistics, allow them to
be fetched, enabled, and disabled via sysfs.

Enable and disable via the boolean:

/sys/devices/systems/cpu/cpuN/mmustat_enable

Statistic values are provided under:

/sys/devices/systems/cpu/cpuN/mmu_status/

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index 5b2831590093..7d1a11822a1e 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -2570,3 +2570,25 @@ sun4v_svc_clrstatus:
         retl
          nop
         .size   sun4v_svc_clrstatus, .-sun4v_svc_clrstatus
+
+        .globl  sun4v_mmustat_conf
+        .type   sun4v_mmustat_conf,#function
+sun4v_mmustat_conf:
+        mov     %o1, %o4
+        mov     HV_FAST_MMUSTAT_CONF, %o5
+        ta      HV_FAST_TRAP
+        stx     %o1, [%o4]
+        retl
+         nop
+        .size   sun4v_mmustat_conf, .-sun4v_mmustat_conf
+
+        .globl  sun4v_mmustat_info
+        .type   sun4v_mmustat_info,#function
+sun4v_mmustat_info:
+        mov     %o0, %o4
+        mov     HV_FAST_MMUSTAT_INFO, %o5
+        ta      HV_FAST_TRAP
+        stx     %o1, [%o4]
+        retl
+         nop
+        .size   sun4v_mmustat_info, .-sun4v_mmustat_info