From 1812924bb1823950c1dc95c478b71b037057356e Mon Sep 17 00:00:00 2001 From: Cliff Wickman Date: Mon, 2 Jun 2008 08:56:14 -0500 Subject: x86, SGI UV: TLB shootdown using broadcast assist unit TLB shootdown for SGI UV. Depends on patch (in tip/x86/irq): x86-update-macros-used-by-uv-platform.patch Jack Steiner May 29 This patch provides the ability to flush TLB's in cpu's that are not on the local node. The hardware mechanism for distributing the flush messages is the UV's "broadcast assist unit". The hook to intercept TLB shootdown requests is a 2-line change to native_flush_tlb_others() (arch/x86/kernel/tlb_64.c). This code has been tested on a hardware simulator. The real hardware is not yet available. The shootdown statistics are provided through /proc/sgi_uv/ptc_statistics. The use of /sys was considered, but would have required the use of many /sys files. The debugfs was also considered, but these statistics should be available on an ongoing basis, not just for debugging. Issues to be fixed later: - The IRQ for the messaging interrupt is currently hardcoded as 200 (see UV_BAU_MESSAGE). It should be dynamically assigned in the future. - The use of appropriate udelay()'s is untested, as they are a problem in the simulator. Signed-off-by: Cliff Wickman Signed-off-by: Ingo Molnar --- arch/x86/kernel/tlb_64.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/x86/kernel/tlb_64.c') diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c index a1f07d79320..fc132113bda 100644 --- a/arch/x86/kernel/tlb_64.c +++ b/arch/x86/kernel/tlb_64.c @@ -15,6 +15,8 @@ #include #include #include +#include +#include #include /* @@ -162,6 +164,9 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm, union smp_flush_state *f; cpumask_t cpumask = *cpumaskp; + if (is_uv_system() && uv_flush_tlb_others(&cpumask, mm, va)) + return; + /* Caller has disabled preemption */ sender = smp_processor_id() % NUM_INVALIDATE_TLB_VECTORS; f = &per_cpu(flush_state, sender); -- cgit v1.2.3 From b194b120507276b4f09e2e14f941884e777fc7c8 Mon Sep 17 00:00:00 2001 From: Cliff Wickman Date: Thu, 12 Jun 2008 08:23:48 -0500 Subject: SGI UV: TLB shootdown using broadcast assist unit, cleanups TLB shootdown for SGI UV. v1: 6/2 original v2: 6/3 corrections/improvements per Ingo's review v3: 6/4 split atomic operations off to a separate patch (Jeremy's review) v4: 6/12 include rather than (fixes a !SMP build problem that Ingo found) fix the index on uv_table_bases[blade] Signed-off-by: Cliff Wickman Signed-off-by: Ingo Molnar --- arch/x86/kernel/tlb_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/kernel/tlb_64.c') diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c index fc132113bda..5039d0f097a 100644 --- a/arch/x86/kernel/tlb_64.c +++ b/arch/x86/kernel/tlb_64.c @@ -165,7 +165,7 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm, cpumask_t cpumask = *cpumaskp; if (is_uv_system() && uv_flush_tlb_others(&cpumask, mm, va)) - return; + return; /* Caller has disabled preemption */ sender = smp_processor_id() % NUM_INVALIDATE_TLB_VECTORS; -- cgit v1.2.3