[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 <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 0cd9b16..1ce9408 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -885,26 +885,44 @@
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+ * the version of the one we are using is now out of date.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)
