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-rw-r--r--arch/s390/include/asm/percpu.h171
1 files changed, 170 insertions, 1 deletions
diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h
index f7ad8719d02..fa91e009745 100644
--- a/arch/s390/include/asm/percpu.h
+++ b/arch/s390/include/asm/percpu.h
@@ -1,21 +1,190 @@
#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__
+#include <linux/preempt.h>
+#include <asm/cmpxchg.h>
+
/*
* s390 uses its own implementation for per cpu data, the offset of
* the cpu local data area is cached in the cpu's lowcore memory.
*/
#define __my_cpu_offset S390_lowcore.percpu_offset
+#ifdef CONFIG_64BIT
+
/*
* For 64 bit module code, the module may be more than 4G above the
* per cpu area, use weak definitions to force the compiler to
* generate external references.
*/
-#if defined(CONFIG_SMP) && defined(__s390x__) && defined(MODULE)
+#if defined(CONFIG_SMP) && defined(MODULE)
#define ARCH_NEEDS_WEAK_PER_CPU
#endif
+/*
+ * We use a compare-and-swap loop since that uses less cpu cycles than
+ * disabling and enabling interrupts like the generic variant would do.
+ */
+#define arch_this_cpu_to_op_simple(pcp, val, op) \
+({ \
+ typedef typeof(pcp) pcp_op_T__; \
+ pcp_op_T__ old__, new__, prev__; \
+ pcp_op_T__ *ptr__; \
+ preempt_disable(); \
+ ptr__ = __this_cpu_ptr(&(pcp)); \
+ prev__ = *ptr__; \
+ do { \
+ old__ = prev__; \
+ new__ = old__ op (val); \
+ prev__ = cmpxchg(ptr__, old__, new__); \
+ } while (prev__ != old__); \
+ preempt_enable(); \
+ new__; \
+})
+
+#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
+#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
+#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
+#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
+
+#ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
+
+#define this_cpu_add_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_add_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
+#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
+#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
+#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
+#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
+
+#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
+
+#define arch_this_cpu_add(pcp, val, op1, op2, szcast) \
+{ \
+ typedef typeof(pcp) pcp_op_T__; \
+ pcp_op_T__ val__ = (val); \
+ pcp_op_T__ old__, *ptr__; \
+ preempt_disable(); \
+ ptr__ = __this_cpu_ptr(&(pcp)); \
+ if (__builtin_constant_p(val__) && \
+ ((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
+ asm volatile( \
+ op2 " %[ptr__],%[val__]\n" \
+ : [ptr__] "+Q" (*ptr__) \
+ : [val__] "i" ((szcast)val__) \
+ : "cc"); \
+ } else { \
+ asm volatile( \
+ op1 " %[old__],%[val__],%[ptr__]\n" \
+ : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
+ : [val__] "d" (val__) \
+ : "cc"); \
+ } \
+ preempt_enable(); \
+}
+
+#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
+#define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
+
+#define arch_this_cpu_add_return(pcp, val, op) \
+({ \
+ typedef typeof(pcp) pcp_op_T__; \
+ pcp_op_T__ val__ = (val); \
+ pcp_op_T__ old__, *ptr__; \
+ preempt_disable(); \
+ ptr__ = __this_cpu_ptr(&(pcp)); \
+ asm volatile( \
+ op " %[old__],%[val__],%[ptr__]\n" \
+ : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
+ : [val__] "d" (val__) \
+ : "cc"); \
+ preempt_enable(); \
+ old__ + val__; \
+})
+
+#define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
+#define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
+
+#define arch_this_cpu_to_op(pcp, val, op) \
+{ \
+ typedef typeof(pcp) pcp_op_T__; \
+ pcp_op_T__ val__ = (val); \
+ pcp_op_T__ old__, *ptr__; \
+ preempt_disable(); \
+ ptr__ = __this_cpu_ptr(&(pcp)); \
+ asm volatile( \
+ op " %[old__],%[val__],%[ptr__]\n" \
+ : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
+ : [val__] "d" (val__) \
+ : "cc"); \
+ preempt_enable(); \
+}
+
+#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
+#define this_cpu_and_8(pcp, val) arch_this_cpu_to_op(pcp, val, "lang")
+#define this_cpu_or_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lao")
+#define this_cpu_or_8(pcp, val) arch_this_cpu_to_op(pcp, val, "laog")
+
+#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
+
+#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
+({ \
+ typedef typeof(pcp) pcp_op_T__; \
+ pcp_op_T__ ret__; \
+ pcp_op_T__ *ptr__; \
+ preempt_disable(); \
+ ptr__ = __this_cpu_ptr(&(pcp)); \
+ ret__ = cmpxchg(ptr__, oval, nval); \
+ preempt_enable(); \
+ ret__; \
+})
+
+#define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+#define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+#define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+#define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
+
+#define arch_this_cpu_xchg(pcp, nval) \
+({ \
+ typeof(pcp) *ptr__; \
+ typeof(pcp) ret__; \
+ preempt_disable(); \
+ ptr__ = __this_cpu_ptr(&(pcp)); \
+ ret__ = xchg(ptr__, nval); \
+ preempt_enable(); \
+ ret__; \
+})
+
+#define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
+
+#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2) \
+({ \
+ typeof(pcp1) o1__ = (o1), n1__ = (n1); \
+ typeof(pcp2) o2__ = (o2), n2__ = (n2); \
+ typeof(pcp1) *p1__; \
+ typeof(pcp2) *p2__; \
+ int ret__; \
+ preempt_disable(); \
+ p1__ = __this_cpu_ptr(&(pcp1)); \
+ p2__ = __this_cpu_ptr(&(pcp2)); \
+ ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__); \
+ preempt_enable(); \
+ ret__; \
+})
+
+#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
+#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
+
+#endif /* CONFIG_64BIT */
+
#include <asm-generic/percpu.h>
#endif /* __ARCH_S390_PERCPU__ */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 01:24:55 +0000