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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-06-13 15:05:48 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-06-19 11:46:27 +0200 |
| commit | a9af97aa0a12c30178dd7ad9af8887d5b9c4647b (patch) | |
| tree | 463875705ded254aebad36ee4347c5eeba5b0846 /arch/powerpc/include/asm/ppc-opcode.h | |
| parent | powerpc/64s/idle: Process interrupts from system reset wakeup (diff) | |
| download | linux-a9af97aa0a12c30178dd7ad9af8887d5b9c4647b.tar.xz linux-a9af97aa0a12c30178dd7ad9af8887d5b9c4647b.zip | |
powerpc/64s: msgclr when handling doorbell exceptions from system reset
msgsnd doorbell exceptions are cleared when the doorbell interrupt is
taken. However if a doorbell exception causes a system reset interrupt
wake from power saving state, the message is not cleared. Processing
the doorbell from the system reset interrupt requires msgclr to avoid
taking the exception again.
Testing this plus the previous wakup direct patch gives:
original wakeup direct msgclr
Different threads, same core: 315k/s 264k/s 345k/s
Different cores: 235k/s 242k/s 242k/s
Net speedup is +10% for same core, and +3% for different core.
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/ppc-opcode.h')
| -rw-r--r-- | arch/powerpc/include/asm/ppc-opcode.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h index 3b6bbf5a8683..4e2cf719c9b2 100644 --- a/arch/powerpc/include/asm/ppc-opcode.h +++ b/arch/powerpc/include/asm/ppc-opcode.h @@ -220,6 +220,7 @@ #define PPC_INST_MSGCLR 0x7c0001dc #define PPC_INST_MSGSYNC 0x7c0006ec #define PPC_INST_MSGSNDP 0x7c00011c +#define PPC_INST_MSGCLRP 0x7c00015c #define PPC_INST_MTTMR 0x7c0003dc #define PPC_INST_NOP 0x60000000 #define PPC_INST_PASTE 0x7c20070d @@ -409,6 +410,8 @@ ___PPC_RB(b)) #define PPC_MSGSNDP(b) stringify_in_c(.long PPC_INST_MSGSNDP | \ ___PPC_RB(b)) +#define PPC_MSGCLRP(b) stringify_in_c(.long PPC_INST_MSGCLRP | \ + ___PPC_RB(b)) #define PPC_POPCNTB(a, s) stringify_in_c(.long PPC_INST_POPCNTB | \ __PPC_RA(a) | __PPC_RS(s)) #define PPC_POPCNTD(a, s) stringify_in_c(.long PPC_INST_POPCNTD | \ |