| 1 |
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| 2 | #ifndef _ASM_POWERPC_SYNCH_H
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| 3 | #define _ASM_POWERPC_SYNCH_H
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| 4 | #ifdef __KERNEL__
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| 5 |
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| 6 | #include <asm/cputable.h>
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| 7 | #include <asm/feature-fixups.h>
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| 8 | #include <asm/ppc-opcode.h>
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| 9 |
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| 10 | #ifndef __ASSEMBLER__
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| 11 | extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
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| 12 | extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
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| 13 | void *fixup_end);
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| 14 |
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| 15 | static inline void eieio(void)
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| 16 | {
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| 17 | if (IS_ENABLED(CONFIG_BOOKE))
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| 18 | __asm__ __volatile__ ("mbar" : : : "memory");
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| 19 | else
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| 20 | __asm__ __volatile__ ("eieio" : : : "memory");
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| 21 | }
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| 22 |
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| 23 | static inline void isync(void)
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| 24 | {
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| 25 | __asm__ __volatile__ ("isync" : : : "memory");
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| 26 | }
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| 27 |
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| 28 | static inline void ppc_after_tlbiel_barrier(void)
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| 29 | {
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| 30 | asm volatile("ptesync": : :"memory");
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| 31 | |
| 32 | * POWER9, POWER10 need a cp_abort after tlbiel to ensure the copy is
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| 33 | * invalidated correctly. If this is not done, the paste can take data
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| 34 | * from the physical address that was translated at copy time.
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| 35 | *
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| 36 | * POWER9 in practice does not need this, because address spaces with
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| 37 | * accelerators mapped will use tlbie (which does invalidate the copy)
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| 38 | * to invalidate translations. It's not possible to limit POWER10 this
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| 39 | * way due to local copy-paste.
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| 40 | *
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| 41 | * POWER12 does not need it.
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| 42 |
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| 43 | asm volatile(ASM_FTR_IF(PPC_CP_ABORT, "", %0, %1) :
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| 44 | : "i" (CPU_FTR_ARCH_31|CPU_FTR_ARCH_32), "i" (CPU_FTR_ARCH_31)
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| 45 | : "memory");
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| 46 | }
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| 47 | #endif
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| 48 |
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| 49 | #if defined(__powerpc64__)
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| 50 | # define LWSYNC lwsync
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| 51 | #elif defined(CONFIG_PPC_E500)
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| 52 | # define LWSYNC \
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| 53 | START_LWSYNC_SECTION(96); \
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| 54 | sync; \
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| 55 | MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
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| 56 | #else
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| 57 | # define LWSYNC sync
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| 58 | #endif
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| 59 |
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| 60 | #ifdef CONFIG_SMP
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| 61 | #define __PPC_ACQUIRE_BARRIER \
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| 62 | START_LWSYNC_SECTION(97); \
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| 63 | isync; \
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| 64 | MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup);
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| 65 | #define PPC_ACQUIRE_BARRIER "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER)
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| 66 | #define PPC_RELEASE_BARRIER stringify_in_c(LWSYNC) "\n"
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| 67 | #define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n"
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| 68 | #define PPC_ATOMIC_EXIT_BARRIER "\n" stringify_in_c(sync) "\n"
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| 69 | #else
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| 70 | #define PPC_ACQUIRE_BARRIER
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| 71 | #define PPC_RELEASE_BARRIER
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| 72 | #define PPC_ATOMIC_ENTRY_BARRIER
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| 73 | #define PPC_ATOMIC_EXIT_BARRIER
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| 74 | #endif
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| 75 |
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| 76 | #endif
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| 77 | #endif
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