sparc64: Use pause instruction when available.

In atomic backoff and cpu_relax(), use the pause instruction
found on SPARC-T4 and later.

It makes the cpu strand unselectable for the given number of
cycles, unless an intervening disrupting trap occurs.

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

3 files changed, 33 insertions, 0 deletions

diff --git a/arch/sparc/kernel/entry.h b/arch/sparc/kernel/entry.h
index 0c218e4c0881..51742df63c75 100644
--- a/arch/sparc/kernel/entry.h
+++ b/arch/sparc/kernel/entry.h
@@ -59,6 +59,13 @@ struct popc_6insn_patch_entry {
 extern struct popc_6insn_patch_entry __popc_6insn_patch,
         __popc_6insn_patch_end;
 
+struct pause_patch_entry {
+        unsigned int    addr;
+        unsigned int    insns[3];
+};
+extern struct pause_patch_entry __pause_patch,
+        __pause_patch_end;
+
 extern void __init per_cpu_patch(void);
 extern void sun4v_patch_1insn_range(struct sun4v_1insn_patch_entry *,
                                     struct sun4v_1insn_patch_entry *);
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 0800e71d8a88..b45cff408de3 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -316,6 +316,25 @@ static void __init popc_patch(void)
         }
 }
 
+static void __init pause_patch(void)
+{
+        struct pause_patch_entry *p;
+
+        p = &__pause_patch;
+        while (p < &__pause_patch_end) {
+                unsigned long i, addr = p->addr;
+
+                for (i = 0; i < 3; i++) {
+                        *(unsigned int *) (addr +  (i * 4)) = p->insns[i];
+                        wmb();
+                        __asm__ __volatile__("flush     %0"
+                                             : : "r" (addr +  (i * 4)));
+                }
+
+                p++;
+        }
+}
+
 #ifdef CONFIG_SMP
 void __init boot_cpu_id_too_large(int cpu)
 {
@@ -528,6 +547,8 @@ static void __init init_sparc64_elf_hwcap(void)
 
         if (sparc64_elf_hwcap & AV_SPARC_POPC)
                 popc_patch();
+        if (sparc64_elf_hwcap & AV_SPARC_PAUSE)
+                pause_patch();
 }
 
 void __init setup_arch(char **cmdline_p)
diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S
index 89c2c29f154b..847f9f793618 100644
--- a/arch/sparc/kernel/vmlinux.lds.S
+++ b/arch/sparc/kernel/vmlinux.lds.S
@@ -132,6 +132,11 @@ SECTIONS
                 *(.popc_6insn_patch)
                 __popc_6insn_patch_end = .;
         }
+        .pause_patch : {
+                __pause_patch = .;
+                *(.pause_patch)
+                __pause_patch_end = .;
+        }
         PERCPU_SECTION(SMP_CACHE_BYTES)
 
         . = ALIGN(PAGE_SIZE);