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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-04-13 12:16:24 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-13 15:34:34 +0200 |
| commit | 6b3edefefa6752df57ad636f26baa1b0a502ddab (patch) | |
| tree | bf00c8ab7b82a22703209b0ba1d0fdddb91fa00b /arch/powerpc/include/asm/dbell.h | |
| parent | powerpc/64s: Avoid a branch for ppc_msgsnd (diff) | |
| download | linux-6b3edefefa6752df57ad636f26baa1b0a502ddab.tar.xz linux-6b3edefefa6752df57ad636f26baa1b0a502ddab.zip | |
powerpc/powernv: POWER9 support for msgsnd/doorbell IPI
POWER9 requires msgsync for receiver-side synchronization, and a DD1
workaround restricts IPIs to core-local.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Drop no longer needed asm feature macro changes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/dbell.h')
| -rw-r--r-- | arch/powerpc/include/asm/dbell.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/dbell.h b/arch/powerpc/include/asm/dbell.h index 040944659a20..f70cbfe0ec04 100644 --- a/arch/powerpc/include/asm/dbell.h +++ b/arch/powerpc/include/asm/dbell.h @@ -51,6 +51,9 @@ static inline void ppc_msgsnd_sync(void) /* sync after taking message interrupt */ static inline void ppc_msgsync(void) { + /* sync is not required when taking messages from the same core */ + __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0) + : : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300)); } #else /* CONFIG_PPC_BOOK3S */ |