/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ARCH_S390_PERCPU__ #define __ARCH_S390_PERCPU__ #include #include #include /* * 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 get_lowcore()->percpu_offset #define arch_raw_cpu_ptr(_ptr) \ ({ \ unsigned long lc_percpu, tcp_ptr__; \ \ tcp_ptr__ = (__force unsigned long)(_ptr); \ lc_percpu = offsetof(struct lowcore, percpu_offset); \ asm_inline volatile( \ ALTERNATIVE("ag %[__ptr__],%[offzero](%%r0)\n", \ "ag %[__ptr__],%[offalt](%%r0)\n", \ ALT_FEATURE(MFEATURE_LOWCORE)) \ : [__ptr__] "+d" (tcp_ptr__) \ : [offzero] "i" (lc_percpu), \ [offalt] "i" (lc_percpu + LOWCORE_ALT_ADDRESS), \ "m" (((struct lowcore *)0)->percpu_offset) \ : "cc"); \ (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__; \ }) /* * 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_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ prev__ = READ_ONCE(*ptr__); \ do { \ old__ = prev__; \ new__ = old__ op (val); \ prev__ = cmpxchg(ptr__, old__, new__); \ } while (prev__ != old__); \ preempt_enable_notrace(); \ 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 MARCH_HAS_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 /* MARCH_HAS_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_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ if (__builtin_constant_p(val__) && \ ((szcast)val__ > -129) && ((szcast)val__ < 128)) { \ asm volatile( \ op2 " %[ptr__],%[val__]" \ : [ptr__] "+Q" (*ptr__) \ : [val__] "i" ((szcast)val__) \ : "cc"); \ } else { \ asm volatile( \ op1 " %[old__],%[val__],%[ptr__]" \ : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \ : [val__] "d" (val__) \ : "cc"); \ } \ preempt_enable_notrace(); \ } #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_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ asm volatile( \ op " %[old__],%[val__],%[ptr__]" \ : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \ : [val__] "d" (val__) \ : "cc"); \ preempt_enable_notrace(); \ 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_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ asm volatile( \ op " %[old__],%[val__],%[ptr__]" \ : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \ : [val__] "d" (val__) \ : "cc"); \ preempt_enable_notrace(); \ } #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 /* MARCH_HAS_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_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ ret__ = cmpxchg(ptr__, oval, nval); \ preempt_enable_notrace(); \ 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 this_cpu_cmpxchg64(pcp, o, n) this_cpu_cmpxchg_8(pcp, o, n) #define this_cpu_cmpxchg128(pcp, oval, nval) \ ({ \ typedef typeof(pcp) pcp_op_T__; \ u128 old__, new__, ret__; \ pcp_op_T__ *ptr__; \ old__ = oval; \ new__ = nval; \ preempt_disable_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ ret__ = cmpxchg128((void *)ptr__, old__, new__); \ preempt_enable_notrace(); \ ret__; \ }) #define arch_this_cpu_xchg(pcp, nval) \ ({ \ typeof(pcp) *ptr__; \ typeof(pcp) ret__; \ preempt_disable_notrace(); \ ptr__ = raw_cpu_ptr(&(pcp)); \ ret__ = xchg(ptr__, nval); \ preempt_enable_notrace(); \ 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) #include #endif /* __ARCH_S390_PERCPU__ */