diff options
Diffstat (limited to 'arch/x86/include/asm/percpu.h')
| -rw-r--r-- | arch/x86/include/asm/percpu.h | 189 |
1 files changed, 148 insertions, 41 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 5e01883eb51e..44958ebaf626 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -4,17 +4,21 @@ #ifdef CONFIG_X86_64 #define __percpu_seg gs +#define __percpu_rel (%rip) #else #define __percpu_seg fs +#define __percpu_rel #endif #ifdef __ASSEMBLY__ #ifdef CONFIG_SMP -#define PER_CPU_VAR(var) %__percpu_seg:var -#else /* ! SMP */ -#define PER_CPU_VAR(var) var -#endif /* SMP */ +#define __percpu %__percpu_seg: +#else +#define __percpu +#endif + +#define PER_CPU_VAR(var) __percpu(var)__percpu_rel #ifdef CONFIG_X86_64_SMP #define INIT_PER_CPU_VAR(var) init_per_cpu__##var @@ -24,30 +28,84 @@ #else /* ...!ASSEMBLY */ +#include <linux/build_bug.h> #include <linux/stringify.h> #include <asm/asm.h> #ifdef CONFIG_SMP + +#ifdef CONFIG_CC_HAS_NAMED_AS + +#ifdef __CHECKER__ +#define __seg_gs __attribute__((address_space(__seg_gs))) +#define __seg_fs __attribute__((address_space(__seg_fs))) +#endif + +#ifdef CONFIG_X86_64 +#define __percpu_seg_override __seg_gs +#else +#define __percpu_seg_override __seg_fs +#endif + +#define __percpu_prefix "" + +#else /* CONFIG_CC_HAS_NAMED_AS */ + +#define __percpu_seg_override #define __percpu_prefix "%%"__stringify(__percpu_seg)":" + +#endif /* CONFIG_CC_HAS_NAMED_AS */ + +#define __force_percpu_prefix "%%"__stringify(__percpu_seg)":" #define __my_cpu_offset this_cpu_read(this_cpu_off) +#ifdef CONFIG_USE_X86_SEG_SUPPORT +/* + * Efficient implementation for cases in which the compiler supports + * named address spaces. Allows the compiler to perform additional + * optimizations that can save more instructions. + */ +#define arch_raw_cpu_ptr(ptr) \ +({ \ + unsigned long tcp_ptr__; \ + tcp_ptr__ = __raw_cpu_read(, this_cpu_off); \ + \ + tcp_ptr__ += (unsigned long)(ptr); \ + (typeof(*(ptr)) __kernel __force *)tcp_ptr__; \ +}) +#else /* CONFIG_USE_X86_SEG_SUPPORT */ /* * Compared to the generic __my_cpu_offset version, the following * saves one instruction and avoids clobbering a temp register. */ -#define arch_raw_cpu_ptr(ptr) \ -({ \ - unsigned long tcp_ptr__; \ - asm ("add " __percpu_arg(1) ", %0" \ - : "=r" (tcp_ptr__) \ - : "m" (this_cpu_off), "0" (ptr)); \ - (typeof(*(ptr)) __kernel __force *)tcp_ptr__; \ +#define arch_raw_cpu_ptr(ptr) \ +({ \ + unsigned long tcp_ptr__; \ + asm ("mov " __percpu_arg(1) ", %0" \ + : "=r" (tcp_ptr__) \ + : "m" (__my_cpu_var(this_cpu_off))); \ + \ + tcp_ptr__ += (unsigned long)(ptr); \ + (typeof(*(ptr)) __kernel __force *)tcp_ptr__; \ }) -#else +#endif /* CONFIG_USE_X86_SEG_SUPPORT */ + +#define PER_CPU_VAR(var) %__percpu_seg:(var)__percpu_rel + +#else /* CONFIG_SMP */ +#define __percpu_seg_override #define __percpu_prefix "" -#endif +#define __force_percpu_prefix "" + +#define PER_CPU_VAR(var) (var)__percpu_rel +#endif /* CONFIG_SMP */ + +#define __my_cpu_type(var) typeof(var) __percpu_seg_override +#define __my_cpu_ptr(ptr) (__my_cpu_type(*ptr) *)(uintptr_t)(ptr) +#define __my_cpu_var(var) (*__my_cpu_ptr(&var)) #define __percpu_arg(x) __percpu_prefix "%" #x +#define __force_percpu_arg(x) __force_percpu_prefix "%" #x /* * Initialized pointers to per-cpu variables needed for the boot @@ -107,14 +165,14 @@ do { \ (void)pto_tmp__; \ } \ asm qual(__pcpu_op2_##size(op, "%[val]", __percpu_arg([var])) \ - : [var] "+m" (_var) \ + : [var] "+m" (__my_cpu_var(_var)) \ : [val] __pcpu_reg_imm_##size(pto_val__)); \ } while (0) #define percpu_unary_op(size, qual, op, _var) \ ({ \ asm qual (__pcpu_op1_##size(op, __percpu_arg([var])) \ - : [var] "+m" (_var)); \ + : [var] "+m" (__my_cpu_var(_var))); \ }) /* @@ -144,16 +202,16 @@ do { \ __pcpu_type_##size pfo_val__; \ asm qual (__pcpu_op2_##size(op, __percpu_arg([var]), "%[val]") \ : [val] __pcpu_reg_##size("=", pfo_val__) \ - : [var] "m" (_var)); \ + : [var] "m" (__my_cpu_var(_var))); \ (typeof(_var))(unsigned long) pfo_val__; \ }) #define percpu_stable_op(size, op, _var) \ ({ \ __pcpu_type_##size pfo_val__; \ - asm(__pcpu_op2_##size(op, __percpu_arg(P[var]), "%[val]") \ + asm(__pcpu_op2_##size(op, __force_percpu_arg(a[var]), "%[val]") \ : [val] __pcpu_reg_##size("=", pfo_val__) \ - : [var] "p" (&(_var))); \ + : [var] "i" (&(_var))); \ (typeof(_var))(unsigned long) pfo_val__; \ }) @@ -166,7 +224,7 @@ do { \ asm qual (__pcpu_op2_##size("xadd", "%[tmp]", \ __percpu_arg([var])) \ : [tmp] __pcpu_reg_##size("+", paro_tmp__), \ - [var] "+m" (_var) \ + [var] "+m" (__my_cpu_var(_var)) \ : : "memory"); \ (typeof(_var))(unsigned long) (paro_tmp__ + _val); \ }) @@ -187,7 +245,7 @@ do { \ __percpu_arg([var])) \ "\n\tjnz 1b" \ : [oval] "=&a" (pxo_old__), \ - [var] "+m" (_var) \ + [var] "+m" (__my_cpu_var(_var)) \ : [nval] __pcpu_reg_##size(, pxo_new__) \ : "memory"); \ (typeof(_var))(unsigned long) pxo_old__; \ @@ -204,7 +262,7 @@ do { \ asm qual (__pcpu_op2_##size("cmpxchg", "%[nval]", \ __percpu_arg([var])) \ : [oval] "+a" (pco_old__), \ - [var] "+m" (_var) \ + [var] "+m" (__my_cpu_var(_var)) \ : [nval] __pcpu_reg_##size(, pco_new__) \ : "memory"); \ (typeof(_var))(unsigned long) pco_old__; \ @@ -221,7 +279,7 @@ do { \ CC_SET(z) \ : CC_OUT(z) (success), \ [oval] "+a" (pco_old__), \ - [var] "+m" (_var) \ + [var] "+m" (__my_cpu_var(_var)) \ : [nval] __pcpu_reg_##size(, pco_new__) \ : "memory"); \ if (unlikely(!success)) \ @@ -244,7 +302,7 @@ do { \ \ asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \ "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \ - : [var] "+m" (_var), \ + : [var] "+m" (__my_cpu_var(_var)), \ "+a" (old__.low), \ "+d" (old__.high) \ : "b" (new__.low), \ @@ -276,7 +334,7 @@ do { \ "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \ CC_SET(z) \ : CC_OUT(z) (success), \ - [var] "+m" (_var), \ + [var] "+m" (__my_cpu_var(_var)), \ "+a" (old__.low), \ "+d" (old__.high) \ : "b" (new__.low), \ @@ -313,7 +371,7 @@ do { \ \ asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \ "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \ - : [var] "+m" (_var), \ + : [var] "+m" (__my_cpu_var(_var)), \ "+a" (old__.low), \ "+d" (old__.high) \ : "b" (new__.low), \ @@ -345,7 +403,7 @@ do { \ "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \ CC_SET(z) \ : CC_OUT(z) (success), \ - [var] "+m" (_var), \ + [var] "+m" (__my_cpu_var(_var)), \ "+a" (old__.low), \ "+d" (old__.high) \ : "b" (new__.low), \ @@ -366,9 +424,9 @@ do { \ * accessed while this_cpu_read_stable() allows the value to be cached. * this_cpu_read_stable() is more efficient and can be used if its value * is guaranteed to be valid across cpus. The current users include - * get_current() and get_thread_info() both of which are actually - * per-thread variables implemented as per-cpu variables and thus - * stable for the duration of the respective task. + * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are + * actually per-thread variables implemented as per-CPU variables and + * thus stable for the duration of the respective task. */ #define this_cpu_read_stable_1(pcp) percpu_stable_op(1, "mov", pcp) #define this_cpu_read_stable_2(pcp) percpu_stable_op(2, "mov", pcp) @@ -376,13 +434,72 @@ do { \ #define this_cpu_read_stable_8(pcp) percpu_stable_op(8, "mov", pcp) #define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp) +#ifdef CONFIG_USE_X86_SEG_SUPPORT + +#define __raw_cpu_read(qual, pcp) \ +({ \ + *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)); \ +}) + +#define __raw_cpu_write(qual, pcp, val) \ +do { \ + *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \ +} while (0) + +#define raw_cpu_read_1(pcp) __raw_cpu_read(, pcp) +#define raw_cpu_read_2(pcp) __raw_cpu_read(, pcp) +#define raw_cpu_read_4(pcp) __raw_cpu_read(, pcp) +#define raw_cpu_write_1(pcp, val) __raw_cpu_write(, pcp, val) +#define raw_cpu_write_2(pcp, val) __raw_cpu_write(, pcp, val) +#define raw_cpu_write_4(pcp, val) __raw_cpu_write(, pcp, val) + +#define this_cpu_read_1(pcp) __raw_cpu_read(volatile, pcp) +#define this_cpu_read_2(pcp) __raw_cpu_read(volatile, pcp) +#define this_cpu_read_4(pcp) __raw_cpu_read(volatile, pcp) +#define this_cpu_write_1(pcp, val) __raw_cpu_write(volatile, pcp, val) +#define this_cpu_write_2(pcp, val) __raw_cpu_write(volatile, pcp, val) +#define this_cpu_write_4(pcp, val) __raw_cpu_write(volatile, pcp, val) + +#ifdef CONFIG_X86_64 +#define raw_cpu_read_8(pcp) __raw_cpu_read(, pcp) +#define raw_cpu_write_8(pcp, val) __raw_cpu_write(, pcp, val) + +#define this_cpu_read_8(pcp) __raw_cpu_read(volatile, pcp) +#define this_cpu_write_8(pcp, val) __raw_cpu_write(volatile, pcp, val) +#endif + +#define this_cpu_read_const(pcp) __raw_cpu_read(, pcp) +#else /* CONFIG_USE_X86_SEG_SUPPORT */ + #define raw_cpu_read_1(pcp) percpu_from_op(1, , "mov", pcp) #define raw_cpu_read_2(pcp) percpu_from_op(2, , "mov", pcp) #define raw_cpu_read_4(pcp) percpu_from_op(4, , "mov", pcp) - #define raw_cpu_write_1(pcp, val) percpu_to_op(1, , "mov", (pcp), val) #define raw_cpu_write_2(pcp, val) percpu_to_op(2, , "mov", (pcp), val) #define raw_cpu_write_4(pcp, val) percpu_to_op(4, , "mov", (pcp), val) + +#define this_cpu_read_1(pcp) percpu_from_op(1, volatile, "mov", pcp) +#define this_cpu_read_2(pcp) percpu_from_op(2, volatile, "mov", pcp) +#define this_cpu_read_4(pcp) percpu_from_op(4, volatile, "mov", pcp) +#define this_cpu_write_1(pcp, val) percpu_to_op(1, volatile, "mov", (pcp), val) +#define this_cpu_write_2(pcp, val) percpu_to_op(2, volatile, "mov", (pcp), val) +#define this_cpu_write_4(pcp, val) percpu_to_op(4, volatile, "mov", (pcp), val) + +#ifdef CONFIG_X86_64 +#define raw_cpu_read_8(pcp) percpu_from_op(8, , "mov", pcp) +#define raw_cpu_write_8(pcp, val) percpu_to_op(8, , "mov", (pcp), val) + +#define this_cpu_read_8(pcp) percpu_from_op(8, volatile, "mov", pcp) +#define this_cpu_write_8(pcp, val) percpu_to_op(8, volatile, "mov", (pcp), val) +#endif + +/* + * The generic per-cpu infrastrucutre is not suitable for + * reading const-qualified variables. + */ +#define this_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) +#endif /* CONFIG_USE_X86_SEG_SUPPORT */ + #define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val) #define raw_cpu_add_2(pcp, val) percpu_add_op(2, , (pcp), val) #define raw_cpu_add_4(pcp, val) percpu_add_op(4, , (pcp), val) @@ -408,12 +525,6 @@ do { \ #define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val) #define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val) -#define this_cpu_read_1(pcp) percpu_from_op(1, volatile, "mov", pcp) -#define this_cpu_read_2(pcp) percpu_from_op(2, volatile, "mov", pcp) -#define this_cpu_read_4(pcp) percpu_from_op(4, volatile, "mov", pcp) -#define this_cpu_write_1(pcp, val) percpu_to_op(1, volatile, "mov", (pcp), val) -#define this_cpu_write_2(pcp, val) percpu_to_op(2, volatile, "mov", (pcp), val) -#define this_cpu_write_4(pcp, val) percpu_to_op(4, volatile, "mov", (pcp), val) #define this_cpu_add_1(pcp, val) percpu_add_op(1, volatile, (pcp), val) #define this_cpu_add_2(pcp, val) percpu_add_op(2, volatile, (pcp), val) #define this_cpu_add_4(pcp, val) percpu_add_op(4, volatile, (pcp), val) @@ -452,8 +563,6 @@ do { \ * 32 bit must fall back to generic operations. */ #ifdef CONFIG_X86_64 -#define raw_cpu_read_8(pcp) percpu_from_op(8, , "mov", pcp) -#define raw_cpu_write_8(pcp, val) percpu_to_op(8, , "mov", (pcp), val) #define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val) #define raw_cpu_and_8(pcp, val) percpu_to_op(8, , "and", (pcp), val) #define raw_cpu_or_8(pcp, val) percpu_to_op(8, , "or", (pcp), val) @@ -462,8 +571,6 @@ do { \ #define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval) #define raw_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval) -#define this_cpu_read_8(pcp) percpu_from_op(8, volatile, "mov", pcp) -#define this_cpu_write_8(pcp, val) percpu_to_op(8, volatile, "mov", (pcp), val) #define this_cpu_add_8(pcp, val) percpu_add_op(8, volatile, (pcp), val) #define this_cpu_and_8(pcp, val) percpu_to_op(8, volatile, "and", (pcp), val) #define this_cpu_or_8(pcp, val) percpu_to_op(8, volatile, "or", (pcp), val) @@ -494,7 +601,7 @@ static inline bool x86_this_cpu_variable_test_bit(int nr, asm volatile("btl "__percpu_arg(2)",%1" CC_SET(c) : CC_OUT(c) (oldbit) - : "m" (*(unsigned long __percpu *)addr), "Ir" (nr)); + : "m" (*__my_cpu_ptr((unsigned long __percpu *)(addr))), "Ir" (nr)); return oldbit; } |