From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752077AbcGQCBS (ORCPT ); Sat, 16 Jul 2016 22:01:18 -0400 Received: from mail-pa0-f66.google.com ([209.85.220.66]:33231 "EHLO mail-pa0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752002AbcGQCBH (ORCPT ); Sat, 16 Jul 2016 22:01:07 -0400 From: wei.guo.simon@gmail.com To: Michael Ellerman Cc: Anshuman Khandual , Benjamin Herrenschmidt , Paul Mackerras , Shuah Khan , Anton Blanchard , Cyril Bur , Simon Guo , Ulrich Weigand , Michael Neuling , Andrew Morton , Kees Cook , Rashmica Gupta , Khem Raj , Jessica Yu , Jiri Kosina , Miroslav Benes , Suraj Jitindar Singh , Chris Smart , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v11 02/27] powerpc/process: Add the function flush_tmregs_to_thread Date: Sun, 17 Jul 2016 09:59:35 +0800 Message-Id: <1468720800-2950-3-git-send-email-wei.guo.simon@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1468720800-2950-1-git-send-email-wei.guo.simon@gmail.com> References: <1468720800-2950-1-git-send-email-wei.guo.simon@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anshuman Khandual This patch creates a function flush_tmregs_to_thread which will then be used by subsequent patches in this series. The function checks for self tracing ptrace interface attempts while in the TM context and logs appropriate warning message. Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Shuah Khan Cc: Anton Blanchard Cc: Cyril Bur Cc: Anshuman Khandual Cc: Simon Guo Cc: Ulrich Weigand Cc: Michael Neuling Cc: Andrew Morton Cc: Kees Cook Cc: Rashmica Gupta Cc: Khem Raj Cc: Jessica Yu Cc: Jiri Kosina Cc: Miroslav Benes Cc: Suraj Jitindar Singh Cc: Chris Smart Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/powerpc/include/asm/switch_to.h | 8 ++++++++ arch/powerpc/kernel/process.c | 20 ++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index 17c8380..0a74ebe 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -75,6 +75,14 @@ static inline void disable_kernel_spe(void) static inline void __giveup_spe(struct task_struct *t) { } #endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +extern void flush_tmregs_to_thread(struct task_struct *); +#else +static inline void flush_tmregs_to_thread(struct task_struct *t) +{ +} +#endif + static inline void clear_task_ebb(struct task_struct *t) { #ifdef CONFIG_PPC_BOOK3S_64 diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 852f257..36d44ec 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1027,6 +1027,26 @@ static inline void restore_sprs(struct thread_struct *old_thread, #endif } +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +void flush_tmregs_to_thread(struct task_struct *tsk) +{ + /* + * Process self tracing is not yet supported through + * ptrace interface. Ptrace generic code should have + * prevented this from happening in the first place. + * Warn once here with the message, if some how it + * is attempted. + */ + WARN_ONCE(tsk == current, + "Not expecting ptrace on self: TM regs may be incorrect\n"); + + /* + * If task is not current, it should have been flushed + * already to it's thread_struct during __switch_to(). + */ +} +#endif + struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *new) { -- 1.8.3.1