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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-04-13 20:16:24 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-13 23:34:34 +1000 |
| commit | 6b3edefefa6752df57ad636f26baa1b0a502ddab (patch) | |
| tree | bf00c8ab7b82a22703209b0ba1d0fdddb91fa00b /arch/powerpc/platforms/powernv | |
| parent | a5adf282461fb6048973ca3aec590495bdbc33f1 (diff) | |
| download | op-kernel-dev-6b3edefefa6752df57ad636f26baa1b0a502ddab.zip op-kernel-dev-6b3edefefa6752df57ad636f26baa1b0a502ddab.tar.gz | |
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/platforms/powernv')
| -rw-r--r-- | arch/powerpc/platforms/powernv/smp.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index 33bd4dd..951a2e2 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -257,6 +257,23 @@ static void pnv_cause_ipi(int cpu) icp_ops->cause_ipi(cpu); } +static void pnv_p9_dd1_cause_ipi(int cpu) +{ + int this_cpu = get_cpu(); + + /* + * POWER9 DD1 has a global addressed msgsnd, but for now we restrict + * IPIs to same core, because it requires additional synchronization + * for inter-core doorbells which we do not implement. + */ + if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) + doorbell_global_ipi(cpu); + else + icp_ops->cause_ipi(cpu); + + put_cpu(); +} + static void __init pnv_smp_probe(void) { if (xive_enabled()) @@ -264,8 +281,15 @@ static void __init pnv_smp_probe(void) else xics_smp_probe(); - if (cpu_has_feature(CPU_FTR_DBELL) && !cpu_has_feature(CPU_FTR_ARCH_300)) { - smp_ops->cause_ipi = pnv_cause_ipi; + if (cpu_has_feature(CPU_FTR_DBELL)) { + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + if (cpu_has_feature(CPU_FTR_POWER9_DD1)) + smp_ops->cause_ipi = pnv_p9_dd1_cause_ipi; + else + smp_ops->cause_ipi = doorbell_global_ipi; + } else { + smp_ops->cause_ipi = pnv_cause_ipi; + } } else { smp_ops->cause_ipi = icp_ops->cause_ipi; } |
