arch/s390/include/asm/percpu.h

   1 #ifndef __ARCH_S390_PERCPU__
   2 #define __ARCH_S390_PERCPU__
   3
   4 #include <linux/preempt.h>
   5 #include <asm/cmpxchg.h>
   6
   7 /*
   8  * s390 uses its own implementation for per cpu data, the offset of
   9  * the cpu local data area is cached in the cpu's lowcore memory.
  10  */
  11 #define __my_cpu_offset S390_lowcore.percpu_offset
  12
  13 /*
  14  * For 64 bit module code, the module may be more than 4G above the
  15  * per cpu area, use weak definitions to force the compiler to
  16  * generate external references.
  17  */
  18 #if defined(CONFIG_SMP) && defined(__s390x__) && defined(MODULE)
  19 #define ARCH_NEEDS_WEAK_PER_CPU
  20 #endif
  21
  22 #define arch_irqsafe_cpu_to_op(pcp, val, op)                            \
  23 do {                                                                    \
  24         typedef typeof(pcp) pcp_op_T__;                                 \
  25         pcp_op_T__ old__, new__, prev__;                                \
  26         pcp_op_T__ *ptr__;                                              \
  27         preempt_disable();                                              \
  28         ptr__ = __this_cpu_ptr(&(pcp));                                 \
  29         prev__ = *ptr__;                                                \
  30         do {                                                            \
  31                 old__ = prev__;                                         \
  32                 new__ = old__ op (val);                                 \
  33                 switch (sizeof(*ptr__)) {                               \
  34                 case 8:                                                 \
  35                         prev__ = cmpxchg64(ptr__, old__, new__);        \
  36                         break;                                          \
  37                 default:                                                \
  38                         prev__ = cmpxchg(ptr__, old__, new__);          \
  39                 }                                                       \
  40         } while (prev__ != old__);                                      \
  41         preempt_enable();                                               \
  42 } while (0)
  43
  44 #define irqsafe_cpu_add_1(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, +)
  45 #define irqsafe_cpu_add_2(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, +)
  46 #define irqsafe_cpu_add_4(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, +)
  47 #define irqsafe_cpu_add_8(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, +)
  48
  49 #define irqsafe_cpu_and_1(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, &)
  50 #define irqsafe_cpu_and_2(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, &)
  51 #define irqsafe_cpu_and_4(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, &)
  52 #define irqsafe_cpu_and_8(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, &)
  53
  54 #define irqsafe_cpu_or_1(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, |)
  55 #define irqsafe_cpu_or_2(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, |)
  56 #define irqsafe_cpu_or_4(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, |)
  57 #define irqsafe_cpu_or_8(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, |)
  58
  59 #define irqsafe_cpu_xor_1(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, ^)
  60 #define irqsafe_cpu_xor_2(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, ^)
  61 #define irqsafe_cpu_xor_4(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, ^)
  62 #define irqsafe_cpu_xor_8(pcp, val) arch_irqsafe_cpu_to_op(pcp, val, ^)
  63
  64 #define arch_irqsafe_cpu_cmpxchg(pcp, oval, nval)                       \
  65 ({                                                                      \
  66         typedef typeof(pcp) pcp_op_T__;                                 \
  67         pcp_op_T__ ret__;                                               \
  68         pcp_op_T__ *ptr__;                                              \
  69         preempt_disable();                                              \
  70         ptr__ = __this_cpu_ptr(&(pcp));                                 \
  71         switch (sizeof(*ptr__)) {                                       \
  72         case 8:                                                         \
  73                 ret__ = cmpxchg64(ptr__, oval, nval);                   \
  74                 break;                                                  \
  75         default:                                                        \
  76                 ret__ = cmpxchg(ptr__, oval, nval);                     \
  77         }                                                               \
  78         preempt_enable();                                               \
  79         ret__;                                                          \
  80 })
  81
  82 #define irqsafe_cpu_cmpxchg_1(pcp, oval, nval) arch_irqsafe_cpu_cmpxchg(pcp, oval, nval)
  83 #define irqsafe_cpu_cmpxchg_2(pcp, oval, nval) arch_irqsafe_cpu_cmpxchg(pcp, oval, nval)
  84 #define irqsafe_cpu_cmpxchg_4(pcp, oval, nval) arch_irqsafe_cpu_cmpxchg(pcp, oval, nval)
  85 #define irqsafe_cpu_cmpxchg_8(pcp, oval, nval) arch_irqsafe_cpu_cmpxchg(pcp, oval, nval)
  86
  87 #include <asm-generic/percpu.h>
  88
  89 #endif /* __ARCH_S390_PERCPU__ */