From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Sat, 05 Nov 2011 22:33:36 +0100 (CET) Received: from [69.28.251.93] ([69.28.251.93]:41207 "EHLO b32.net" rhost-flags-FAIL-FAIL-OK-OK) by eddie.linux-mips.org with ESMTP id S1904165Ab1KEVd1 (ORCPT ); Sat, 5 Nov 2011 22:33:27 +0100 Received: (qmail 28051 invoked from network); 5 Nov 2011 17:28:27 -0000 Received: from unknown (HELO vps-1001064-677.cp.jvds.com) (127.0.0.1) by 127.0.0.1 with (DHE-RSA-AES128-SHA encrypted) SMTP; 5 Nov 2011 17:28:27 -0000 Received: by vps-1001064-677.cp.jvds.com (sSMTP sendmail emulation); Sat, 05 Nov 2011 10:28:27 -0700 From: Kevin Cernekee To: Ralf Baechle Cc: linux-mips@linux-mips.org, Maksim Rayskiy , Kevin D. Kissell , Sergey Shtylyov Subject: [PATCH RESEND 1/9] MIPS: Add local_flush_tlb_all_mm to clear all mm contexts on calling cpu Date: Sat, 05 Nov 2011 14:21:10 -0700 Message-Id: User-Agent: vim 7.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-archive-position: 31403 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: cernekee@gmail.com Precedence: bulk X-list: linux-mips Return-Path: X-Keywords: X-UID: 4398 From: Maksim Rayskiy When hotplug removing a cpu, all mm context TLB entries must be cleared to avoid ASID conflict when cpu is restarted. New functions local_flush_tlb_all_mm() and all-cpu version flush_tlb_all_mm() are added. To function properly, local_flush_tlb_all_mm() must be called when mm_cpumask for all mm context on given cpu is cleared. Signed-off-by: Maksim Rayskiy Tested-by: Kevin Cernekee --- arch/mips/include/asm/tlbflush.h | 4 ++++ arch/mips/kernel/smp.c | 10 ++++++++++ arch/mips/mm/tlb-r4k.c | 13 +++++++++++++ 3 files changed, 27 insertions(+), 0 deletions(-) diff --git a/arch/mips/include/asm/tlbflush.h b/arch/mips/include/asm/tlbflush.h index 86b21de..d7b75e6 100644 --- a/arch/mips/include/asm/tlbflush.h +++ b/arch/mips/include/asm/tlbflush.h @@ -8,12 +8,14 @@ * * - flush_tlb_all() flushes all processes TLB entries * - flush_tlb_mm(mm) flushes the specified mm context TLB entries + * - flush_tlb_all_mm() flushes all mm context TLB entries * - flush_tlb_page(vma, vmaddr) flushes one page * - flush_tlb_range(vma, start, end) flushes a range of pages * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages */ extern void local_flush_tlb_all(void); extern void local_flush_tlb_mm(struct mm_struct *mm); +extern void local_flush_tlb_all_mm(void); extern void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); extern void local_flush_tlb_kernel_range(unsigned long start, @@ -26,6 +28,7 @@ extern void local_flush_tlb_one(unsigned long vaddr); extern void flush_tlb_all(void); extern void flush_tlb_mm(struct mm_struct *); +extern void flush_tlb_all_mm(void); extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long, unsigned long); extern void flush_tlb_kernel_range(unsigned long, unsigned long); @@ -36,6 +39,7 @@ extern void flush_tlb_one(unsigned long vaddr); #define flush_tlb_all() local_flush_tlb_all() #define flush_tlb_mm(mm) local_flush_tlb_mm(mm) +#define flush_tlb_all_mm() local_flush_tlb_all_mm() #define flush_tlb_range(vma, vmaddr, end) local_flush_tlb_range(vma, vmaddr, end) #define flush_tlb_kernel_range(vmaddr,end) \ local_flush_tlb_kernel_range(vmaddr, end) diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 32c1e95..78ca04c 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -269,6 +269,16 @@ void flush_tlb_all(void) on_each_cpu(flush_tlb_all_ipi, NULL, 1); } +static void flush_tlb_all_mm_ipi(void *info) +{ + local_flush_tlb_all_mm(); +} + +void flush_tlb_all_mm(void) +{ + on_each_cpu(flush_tlb_all_mm_ipi, NULL, 1); +} + static void flush_tlb_mm_ipi(void *mm) { local_flush_tlb_mm((struct mm_struct *)mm); diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c index 0d394e0..908fbe9 100644 --- a/arch/mips/mm/tlb-r4k.c +++ b/arch/mips/mm/tlb-r4k.c @@ -66,6 +66,19 @@ extern void build_tlb_refill_handler(void); #endif +/* This function will clear all mm contexts on calling cpu + * To produce desired effect it must be called + * when mm_cpumask for all mm contexts is cleared + */ +void local_flush_tlb_all_mm(void) +{ + struct task_struct *p; + + for_each_process(p) + if (p->mm) + local_flush_tlb_mm(p->mm); +} + void local_flush_tlb_all(void) { unsigned long flags; -- 1.7.6.3