From a0663a79ad4faebe1db4a56e2e767b120b12333a Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 23 Feb 2006 14:19:28 -0800 Subject: [SPARC64]: Fix TLB context allocation with SMT style shared TLBs. The context allocation scheme we use depends upon there being a 1<-->1 mapping from cpu to physical TLB for correctness. Chips like Niagara break this assumption. So what we do is notify all cpus with a cross call when the context version number changes, and if necessary this makes them allocate a valid context for the address space they are running at the time. Stress tested with make -j1024, make -j2048, and make -j4096 kernel builds on a 32-strand, 8 core, T2000 with 16GB of ram. Signed-off-by: David S. Miller --- arch/sparc64/kernel/smp.c | 40 +++++++++++++++++++++++++++++----------- 1 file changed, 29 insertions(+), 11 deletions(-) (limited to 'arch/sparc64/kernel/smp.c') diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c index 0cd9b16612e7..1ce940811492 100644 --- a/arch/sparc64/kernel/smp.c +++ b/arch/sparc64/kernel/smp.c @@ -885,26 +885,44 @@ void flush_dcache_page_all(struct mm_struct *mm, struct page *page) put_cpu(); } +static void __smp_receive_signal_mask(cpumask_t mask) +{ + smp_cross_call_masked(&xcall_receive_signal, 0, 0, 0, mask); +} + void smp_receive_signal(int cpu) { cpumask_t mask = cpumask_of_cpu(cpu); - if (cpu_online(cpu)) { - u64 data0 = (((u64)&xcall_receive_signal) & 0xffffffff); - - if (tlb_type == spitfire) - spitfire_xcall_deliver(data0, 0, 0, mask); - else if (tlb_type == cheetah || tlb_type == cheetah_plus) - cheetah_xcall_deliver(data0, 0, 0, mask); - else if (tlb_type == hypervisor) - hypervisor_xcall_deliver(data0, 0, 0, mask); - } + if (cpu_online(cpu)) + __smp_receive_signal_mask(mask); } void smp_receive_signal_client(int irq, struct pt_regs *regs) { - /* Just return, rtrap takes care of the rest. */ + struct mm_struct *mm; + clear_softint(1 << irq); + + /* See if we need to allocate a new TLB context because + * the version of the one we are using is now out of date. + */ + mm = current->active_mm; + if (likely(mm)) { + if (unlikely(!CTX_VALID(mm->context))) { + unsigned long flags; + + spin_lock_irqsave(&mm->context.lock, flags); + get_new_mmu_context(mm); + load_secondary_context(mm); + spin_unlock_irqrestore(&mm->context.lock, flags); + } + } +} + +void smp_new_mmu_context_version(void) +{ + __smp_receive_signal_mask(cpu_online_map); } void smp_report_regs(void) -- cgit v1.2.3