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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _ASM_POWERPC_SYNCH_H |
| 3 | #define _ASM_POWERPC_SYNCH_H |
| 4 | #ifdef __KERNEL__ |
| 5 | |
| 6 | #include <asm/cputable.h> |
| 7 | #include <asm/feature-fixups.h> |
| 8 | #include <asm/ppc-opcode.h> |
| 9 | |
| 10 | #ifndef __ASSEMBLER__ |
| 11 | extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup; |
| 12 | extern void do_lwsync_fixups(unsigned long value, void *fixup_start, |
| 13 | void *fixup_end); |
| 14 | |
| 15 | static inline void eieio(void) |
| 16 | { |
| 17 | if (IS_ENABLED(CONFIG_BOOKE)) |
| 18 | __asm__ __volatile__ ("mbar" : : : "memory"); |
| 19 | else |
| 20 | __asm__ __volatile__ ("eieio" : : : "memory"); |
| 21 | } |
| 22 | |
| 23 | static inline void isync(void) |
| 24 | { |
| 25 | __asm__ __volatile__ ("isync" : : : "memory"); |
| 26 | } |
| 27 | |
| 28 | static inline void ppc_after_tlbiel_barrier(void) |
| 29 | { |
| 30 | asm volatile("ptesync": : :"memory"); |
| 31 | /* |
| 32 | * POWER9, POWER10 need a cp_abort after tlbiel to ensure the copy is |
| 33 | * invalidated correctly. If this is not done, the paste can take data |
| 34 | * from the physical address that was translated at copy time. |
| 35 | * |
| 36 | * POWER9 in practice does not need this, because address spaces with |
| 37 | * accelerators mapped will use tlbie (which does invalidate the copy) |
| 38 | * to invalidate translations. It's not possible to limit POWER10 this |
| 39 | * way due to local copy-paste. |
| 40 | */ |
| 41 | asm volatile(ASM_FTR_IFSET(PPC_CP_ABORT, "", %0) : : "i" (CPU_FTR_ARCH_31) : "memory"); |
| 42 | } |
| 43 | #endif /* __ASSEMBLER__ */ |
| 44 | |
| 45 | #if defined(__powerpc64__) |
| 46 | # define LWSYNC lwsync |
| 47 | #elif defined(CONFIG_PPC_E500) |
| 48 | # define LWSYNC \ |
| 49 | START_LWSYNC_SECTION(96); \ |
| 50 | sync; \ |
| 51 | MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup); |
| 52 | #else |
| 53 | # define LWSYNC sync |
| 54 | #endif |
| 55 | |
| 56 | #ifdef CONFIG_SMP |
| 57 | #define __PPC_ACQUIRE_BARRIER \ |
| 58 | START_LWSYNC_SECTION(97); \ |
| 59 | isync; \ |
| 60 | MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup); |
| 61 | #define PPC_ACQUIRE_BARRIER "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER) |
| 62 | #define PPC_RELEASE_BARRIER stringify_in_c(LWSYNC) "\n" |
| 63 | #define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n" |
| 64 | #define PPC_ATOMIC_EXIT_BARRIER "\n" stringify_in_c(sync) "\n" |
| 65 | #else |
| 66 | #define PPC_ACQUIRE_BARRIER |
| 67 | #define PPC_RELEASE_BARRIER |
| 68 | #define PPC_ATOMIC_ENTRY_BARRIER |
| 69 | #define PPC_ATOMIC_EXIT_BARRIER |
| 70 | #endif |
| 71 | |
| 72 | #endif /* __KERNEL__ */ |
| 73 | #endif /* _ASM_POWERPC_SYNCH_H */ |
| 74 |
Warning: This file is not a C or C++ file. It does not have highlighting.