arch/s390/include/asm/percpu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ARCH_S390_PERCPU__
   3 #define __ARCH_S390_PERCPU__
   4
   5 #include <linux/preempt.h>
   6 #include <asm/cmpxchg.h>
   7
   8 /*
   9  * s390 uses its own implementation for per cpu data, the offset of
  10  * the cpu local data area is cached in the cpu's lowcore memory.
  11  */
  12 #define __my_cpu_offset S390_lowcore.percpu_offset
  13
  14 /*
  15  * For 64 bit module code, the module may be more than 4G above the
  16  * per cpu area, use weak definitions to force the compiler to
  17  * generate external references.
  18  */
  19 #if defined(CONFIG_SMP) && defined(MODULE)
  20 #define ARCH_NEEDS_WEAK_PER_CPU
  21 #endif
  22
  23 /*
  24  * We use a compare-and-swap loop since that uses less cpu cycles than
  25  * disabling and enabling interrupts like the generic variant would do.
  26  */
  27 #define arch_this_cpu_to_op_simple(pcp, val, op)                        \
  28 ({                                                                      \
  29         typedef typeof(pcp) pcp_op_T__;                                 \
  30         pcp_op_T__ old__, new__, prev__;                                \
  31         pcp_op_T__ *ptr__;                                              \
  32         preempt_disable();                                              \
  33         ptr__ = raw_cpu_ptr(&(pcp));                                    \
  34         prev__ = *ptr__;                                                \
  35         do {                                                            \
  36                 old__ = prev__;                                         \
  37                 new__ = old__ op (val);                                 \
  38                 prev__ = cmpxchg(ptr__, old__, new__);                  \
  39         } while (prev__ != old__);                                      \
  40         preempt_enable();                                               \
  41         new__;                                                          \
  42 })
  43
  44 #define this_cpu_add_1(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, +)
  45 #define this_cpu_add_2(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, +)
  46 #define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
  47 #define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
  48 #define this_cpu_and_1(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, &)
  49 #define this_cpu_and_2(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, &)
  50 #define this_cpu_or_1(pcp, val)         arch_this_cpu_to_op_simple(pcp, val, |)
  51 #define this_cpu_or_2(pcp, val)         arch_this_cpu_to_op_simple(pcp, val, |)
  52
  53 #ifndef CONFIG_HAVE_MARCH_Z196_FEATURES
  54
  55 #define this_cpu_add_4(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, +)
  56 #define this_cpu_add_8(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, +)
  57 #define this_cpu_add_return_4(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
  58 #define this_cpu_add_return_8(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
  59 #define this_cpu_and_4(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, &)
  60 #define this_cpu_and_8(pcp, val)        arch_this_cpu_to_op_simple(pcp, val, &)
  61 #define this_cpu_or_4(pcp, val)         arch_this_cpu_to_op_simple(pcp, val, |)
  62 #define this_cpu_or_8(pcp, val)         arch_this_cpu_to_op_simple(pcp, val, |)
  63
  64 #else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
  65
  66 #define arch_this_cpu_add(pcp, val, op1, op2, szcast)                   \
  67 {                                                                       \
  68         typedef typeof(pcp) pcp_op_T__;                                 \
  69         pcp_op_T__ val__ = (val);                                       \
  70         pcp_op_T__ old__, *ptr__;                                       \
  71         preempt_disable();                                              \
  72         ptr__ = raw_cpu_ptr(&(pcp));                            \
  73         if (__builtin_constant_p(val__) &&                              \
  74             ((szcast)val__ > -129) && ((szcast)val__ < 128)) {          \
  75                 asm volatile(                                           \
  76                         op2 "   %[ptr__],%[val__]\n"                    \
  77                         : [ptr__] "+Q" (*ptr__)                         \
  78                         : [val__] "i" ((szcast)val__)                   \
  79                         : "cc");                                        \
  80         } else {                                                        \
  81                 asm volatile(                                           \
  82                         op1 "   %[old__],%[val__],%[ptr__]\n"           \
  83                         : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__)   \
  84                         : [val__] "d" (val__)                           \
  85                         : "cc");                                        \
  86         }                                                               \
  87         preempt_enable();                                               \
  88 }
  89
  90 #define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
  91 #define this_cpu_add_8(pcp, val) arch_this_cpu_add(pcp, val, "laag", "agsi", long)
  92
  93 #define arch_this_cpu_add_return(pcp, val, op)                          \
  94 ({                                                                      \
  95         typedef typeof(pcp) pcp_op_T__;                                 \
  96         pcp_op_T__ val__ = (val);                                       \
  97         pcp_op_T__ old__, *ptr__;                                       \
  98         preempt_disable();                                              \
  99         ptr__ = raw_cpu_ptr(&(pcp));                                    \
 100         asm volatile(                                                   \
 101                 op "    %[old__],%[val__],%[ptr__]\n"                   \
 102                 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__)           \
 103                 : [val__] "d" (val__)                                   \
 104                 : "cc");                                                \
 105         preempt_enable();                                               \
 106         old__ + val__;                                                  \
 107 })
 108
 109 #define this_cpu_add_return_4(pcp, val) arch_this_cpu_add_return(pcp, val, "laa")
 110 #define this_cpu_add_return_8(pcp, val) arch_this_cpu_add_return(pcp, val, "laag")
 111
 112 #define arch_this_cpu_to_op(pcp, val, op)                               \
 113 {                                                                       \
 114         typedef typeof(pcp) pcp_op_T__;                                 \
 115         pcp_op_T__ val__ = (val);                                       \
 116         pcp_op_T__ old__, *ptr__;                                       \
 117         preempt_disable();                                              \
 118         ptr__ = raw_cpu_ptr(&(pcp));                                    \
 119         asm volatile(                                                   \
 120                 op "    %[old__],%[val__],%[ptr__]\n"                   \
 121                 : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__)           \
 122                 : [val__] "d" (val__)                                   \
 123                 : "cc");                                                \
 124         preempt_enable();                                               \
 125 }
 126
 127 #define this_cpu_and_4(pcp, val)        arch_this_cpu_to_op(pcp, val, "lan")
 128 #define this_cpu_and_8(pcp, val)        arch_this_cpu_to_op(pcp, val, "lang")
 129 #define this_cpu_or_4(pcp, val)         arch_this_cpu_to_op(pcp, val, "lao")
 130 #define this_cpu_or_8(pcp, val)         arch_this_cpu_to_op(pcp, val, "laog")
 131
 132 #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
 133
 134 #define arch_this_cpu_cmpxchg(pcp, oval, nval)                          \
 135 ({                                                                      \
 136         typedef typeof(pcp) pcp_op_T__;                                 \
 137         pcp_op_T__ ret__;                                               \
 138         pcp_op_T__ *ptr__;                                              \
 139         preempt_disable();                                              \
 140         ptr__ = raw_cpu_ptr(&(pcp));                                    \
 141         ret__ = cmpxchg(ptr__, oval, nval);                             \
 142         preempt_enable();                                               \
 143         ret__;                                                          \
 144 })
 145
 146 #define this_cpu_cmpxchg_1(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
 147 #define this_cpu_cmpxchg_2(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
 148 #define this_cpu_cmpxchg_4(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
 149 #define this_cpu_cmpxchg_8(pcp, oval, nval) arch_this_cpu_cmpxchg(pcp, oval, nval)
 150
 151 #define arch_this_cpu_xchg(pcp, nval)                                   \
 152 ({                                                                      \
 153         typeof(pcp) *ptr__;                                             \
 154         typeof(pcp) ret__;                                              \
 155         preempt_disable();                                              \
 156         ptr__ = raw_cpu_ptr(&(pcp));                                    \
 157         ret__ = xchg(ptr__, nval);                                      \
 158         preempt_enable();                                               \
 159         ret__;                                                          \
 160 })
 161
 162 #define this_cpu_xchg_1(pcp, nval) arch_this_cpu_xchg(pcp, nval)
 163 #define this_cpu_xchg_2(pcp, nval) arch_this_cpu_xchg(pcp, nval)
 164 #define this_cpu_xchg_4(pcp, nval) arch_this_cpu_xchg(pcp, nval)
 165 #define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
 166
 167 #define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2)        \
 168 ({                                                                      \
 169         typeof(pcp1) o1__ = (o1), n1__ = (n1);                          \
 170         typeof(pcp2) o2__ = (o2), n2__ = (n2);                          \
 171         typeof(pcp1) *p1__;                                             \
 172         typeof(pcp2) *p2__;                                             \
 173         int ret__;                                                      \
 174         preempt_disable();                                              \
 175         p1__ = raw_cpu_ptr(&(pcp1));                                    \
 176         p2__ = raw_cpu_ptr(&(pcp2));                                    \
 177         ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__);   \
 178         preempt_enable();                                               \
 179         ret__;                                                          \
 180 })
 181
 182 #define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
 183
 184 #include <asm-generic/percpu.h>
 185
 186 #endif /* __ARCH_S390_PERCPU__ */