powerpc/64s: Implement local_t using irq soft masking

local_t is used for atomic modifications for per-CPU data, versus
re-entrant modifications via interrupts.

local_t read-modify-write atomic operations are currently implemented
with hardware atomics (larx/stcx), which are quite slow. This patch
implements them by masking all types of interrupts that may do local_t
operations ("standard" and perf interrupts).

Rusty's benchmark (https://lkml.org/lkml/2008/12/16/450) gives the
following timings for the local_t test, in nanoseconds per iteration:

             larx/stcx   irq+pmu disable
_inc                38                10
_add                38                10
_read                4                 4
_add_return         38                10

There are still some interrupt types (system reset, machine check, and
watchdog), which can not safely use local_t operations, because they
are not masked.

An alternative approach was proposed, using a CR bit to mark a critical
section, which is tested in the interrupt return path, and would then
branch to a fixup handler (similar to exception fixups), which re-starts
the operation. The problem with this was the complexity of the fixup
handler and the latency of the slow path.

https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-November/123024.html

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
index cfbcc31..fdd0093 100644 (file)
--- a/arch/powerpc/include/asm/local.h
+++ b/arch/powerpc/include/asm/local.h
@@ -2,6 +2,147 @@
 #ifndef _ARCH_POWERPC_LOCAL_H
 #define _ARCH_POWERPC_LOCAL_H
 
+#ifdef CONFIG_PPC_BOOK3S_64
+
+#include <linux/percpu.h>
+#include <linux/atomic.h>
+#include <linux/irqflags.h>
+
+#include <asm/hw_irq.h>
+
+typedef struct
+{
+       long v;
+} local_t;
+
+#define LOCAL_INIT(i)  { (i) }
+
+static __inline__ long local_read(local_t *l)
+{
+       return READ_ONCE(l->v);
+}
+
+static __inline__ void local_set(local_t *l, long i)
+{
+       WRITE_ONCE(l->v, i);
+}
+
+#define LOCAL_OP(op, c_op)                                             \
+static __inline__ void local_##op(long i, local_t *l)                  \
+{                                                                      \
+       unsigned long flags;                                            \
+                                                                       \
+       powerpc_local_irq_pmu_save(flags);                              \
+       l->v c_op i;                                            \
+       powerpc_local_irq_pmu_restore(flags);                           \
+}
+
+#define LOCAL_OP_RETURN(op, c_op)                                      \
+static __inline__ long local_##op##_return(long a, local_t *l)         \
+{                                                                      \
+       long t;                                                         \
+       unsigned long flags;                                            \
+                                                                       \
+       powerpc_local_irq_pmu_save(flags);                              \
+       t = (l->v c_op a);                                              \
+       powerpc_local_irq_pmu_restore(flags);                           \
+                                                                       \
+       return t;                                                       \
+}
+
+#define LOCAL_OPS(op, c_op)            \
+       LOCAL_OP(op, c_op)              \
+       LOCAL_OP_RETURN(op, c_op)
+
+LOCAL_OPS(add, +=)
+LOCAL_OPS(sub, -=)
+
+#define local_add_negative(a, l)       (local_add_return((a), (l)) < 0)
+#define local_inc_return(l)            local_add_return(1LL, l)
+#define local_inc(l)                   local_inc_return(l)
+
+/*
+ * local_inc_and_test - increment and test
+ * @l: pointer of type local_t
+ *
+ * Atomically increments @l by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+#define local_inc_and_test(l)          (local_inc_return(l) == 0)
+
+#define local_dec_return(l)            local_sub_return(1LL, l)
+#define local_dec(l)                   local_dec_return(l)
+#define local_sub_and_test(a, l)       (local_sub_return((a), (l)) == 0)
+#define local_dec_and_test(l)          (local_dec_return((l)) == 0)
+
+static __inline__ long local_cmpxchg(local_t *l, long o, long n)
+{
+       long t;
+       unsigned long flags;
+
+       powerpc_local_irq_pmu_save(flags);
+       t = l->v;
+       if (t == o)
+               l->v = n;
+       powerpc_local_irq_pmu_restore(flags);
+
+       return t;
+}
+
+static __inline__ long local_xchg(local_t *l, long n)
+{
+       long t;
+       unsigned long flags;
+
+       powerpc_local_irq_pmu_save(flags);
+       t = l->v;
+       l->v = n;
+       powerpc_local_irq_pmu_restore(flags);
+
+       return t;
+}
+
+/**
+ * local_add_unless - add unless the number is a given value
+ * @l: pointer of type local_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @l, so long as it was not @u.
+ * Returns non-zero if @l was not @u, and zero otherwise.
+ */
+static __inline__ int local_add_unless(local_t *l, long a, long u)
+{
+       unsigned long flags;
+       int ret = 0;
+
+       powerpc_local_irq_pmu_save(flags);
+       if (l->v != u) {
+               l->v += a;
+               ret = 1;
+       }
+       powerpc_local_irq_pmu_restore(flags);
+
+       return ret;
+}
+
+#define local_inc_not_zero(l)          local_add_unless((l), 1, 0)
+
+/* Use these for per-cpu local_t variables: on some archs they are
+ * much more efficient than these naive implementations.  Note they take
+ * a variable, not an address.
+ */
+
+#define __local_inc(l)         ((l)->v++)
+#define __local_dec(l)         ((l)->v++)
+#define __local_add(i,l)       ((l)->v+=(i))
+#define __local_sub(i,l)       ((l)->v-=(i))
+
+#else /* CONFIG_PPC64 */
+
 #include <asm-generic/local.h>
 
+#endif /* CONFIG_PPC64 */
+
 #endif /* _ARCH_POWERPC_LOCAL_H */