From patchwork Mon Apr 30 22:44:26 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Desnoyers X-Patchwork-Id: 906893 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40ZfmF02PFz9s0n for ; Tue, 1 May 2018 08:46:37 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=efficios.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 40ZfmD59qRzF2QT for ; Tue, 1 May 2018 08:46:36 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=efficios.com X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=efficios.com (client-ip=167.114.142.138; helo=mail.efficios.com; envelope-from=mathieu.desnoyers@efficios.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=efficios.com Received: from mail.efficios.com (mail.efficios.com [167.114.142.138]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40ZfkC4TNBzF2QG for ; Tue, 1 May 2018 08:44:50 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 21B1A1A6316; Mon, 30 Apr 2018 18:44:46 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail02.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id J8Xw2C-_YYVf; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 328F61A62E5; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail02.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id b6KUgib-O0uW; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) Received: from thinkos.internal.efficios.com (192-222-157-41.qc.cable.ebox.net [192.222.157.41]) by mail.efficios.com (Postfix) with ESMTPSA id B5EB31A62C1; Mon, 30 Apr 2018 18:44:44 -0400 (EDT) From: Mathieu Desnoyers To: Peter Zijlstra , "Paul E . McKenney" , Boqun Feng , Andy Lutomirski , Dave Watson Subject: [PATCH 07/14] powerpc: Add support for restartable sequences Date: Mon, 30 Apr 2018 18:44:26 -0400 Message-Id: <20180430224433.17407-8-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180430224433.17407-1-mathieu.desnoyers@efficios.com> References: <20180430224433.17407-1-mathieu.desnoyers@efficios.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joel Fernandes , Will Deacon , Andi Kleen , Paul Mackerras , "H . Peter Anvin" , Chris Lameter , Russell King , Andrew Hunter , Ingo Molnar , Michael Kerrisk , Catalin Marinas , Paul Turner , Josh Triplett , Steven Rostedt , Ben Maurer , Mathieu Desnoyers , Thomas Gleixner , linux-api@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andrew Morton , Linus Torvalds Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Boqun Feng Call the rseq_handle_notify_resume() function on return to userspace if TIF_NOTIFY_RESUME thread flag is set. Perform fixup on the pre-signal when a signal is delivered on top of a restartable sequence critical section. Signed-off-by: Boqun Feng Signed-off-by: Mathieu Desnoyers CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Michael Ellerman CC: Peter Zijlstra CC: "Paul E. McKenney" CC: linuxppc-dev@lists.ozlabs.org Signed-off-by: Boqun Feng --- arch/powerpc/Kconfig | 1 + arch/powerpc/kernel/signal.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c32a181a7cbb..ed21a777e8c6 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -223,6 +223,7 @@ config PPC select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING select HAVE_IRQ_TIME_ACCOUNTING + select HAVE_RSEQ select IRQ_DOMAIN select IRQ_FORCED_THREADING select MODULES_USE_ELF_RELA diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index 61db86ecd318..d3bb3aaaf5ac 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -133,6 +133,8 @@ static void do_signal(struct task_struct *tsk) /* Re-enable the breakpoints for the signal stack */ thread_change_pc(tsk, tsk->thread.regs); + rseq_signal_deliver(tsk->thread.regs); + if (is32) { if (ksig.ka.sa.sa_flags & SA_SIGINFO) ret = handle_rt_signal32(&ksig, oldset, tsk); @@ -164,6 +166,7 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) if (thread_info_flags & _TIF_NOTIFY_RESUME) { clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); + rseq_handle_notify_resume(regs); } user_enter(); From patchwork Mon Apr 30 22:44:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Desnoyers X-Patchwork-Id: 906894 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40Zfpq4shQz9s27 for ; Tue, 1 May 2018 08:48:51 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=efficios.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 40Zfpq2rFMzF2QP for ; Tue, 1 May 2018 08:48:51 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=efficios.com X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=efficios.com (client-ip=167.114.142.138; helo=mail.efficios.com; envelope-from=mathieu.desnoyers@efficios.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=efficios.com Received: from mail.efficios.com (mail.efficios.com [167.114.142.138]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40ZfkC4HMfzF2QF for ; Tue, 1 May 2018 08:44:50 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 110911A630F; Mon, 30 Apr 2018 18:44:46 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail02.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id pbmvhzmNaFkr; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 912F41A62F5; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail02.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id zuIFTf16aZoO; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) Received: from thinkos.internal.efficios.com (192-222-157-41.qc.cable.ebox.net [192.222.157.41]) by mail.efficios.com (Postfix) with ESMTPSA id 2944F1A62DB; Mon, 30 Apr 2018 18:44:45 -0400 (EDT) From: Mathieu Desnoyers To: Peter Zijlstra , "Paul E . McKenney" , Boqun Feng , Andy Lutomirski , Dave Watson Subject: [PATCH 08/14] powerpc: Wire up restartable sequences system call Date: Mon, 30 Apr 2018 18:44:27 -0400 Message-Id: <20180430224433.17407-9-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180430224433.17407-1-mathieu.desnoyers@efficios.com> References: <20180430224433.17407-1-mathieu.desnoyers@efficios.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joel Fernandes , Will Deacon , Andi Kleen , Paul Mackerras , "H . Peter Anvin" , Chris Lameter , Russell King , Andrew Hunter , Ingo Molnar , Michael Kerrisk , Catalin Marinas , Paul Turner , Josh Triplett , Steven Rostedt , Ben Maurer , Mathieu Desnoyers , Thomas Gleixner , linux-api@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andrew Morton , Linus Torvalds Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Boqun Feng Wire up the rseq system call on powerpc. This provides an ABI improving the speed of a user-space getcpu operation on powerpc by skipping the getcpu system call on the fast path, as well as improving the speed of user-space operations on per-cpu data compared to using load-reservation/store-conditional atomics. TODO: wire up rseq_syscall() on return from system call. It is used with CONFIG_DEBUG_RSEQ=y to ensure system calls are not issued within rseq critical section Signed-off-by: Boqun Feng Signed-off-by: Mathieu Desnoyers CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Michael Ellerman CC: Peter Zijlstra CC: "Paul E. McKenney" CC: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/include/asm/systbl.h | 1 + arch/powerpc/include/asm/unistd.h | 2 +- arch/powerpc/include/uapi/asm/unistd.h | 1 + 3 files changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/systbl.h b/arch/powerpc/include/asm/systbl.h index d61f9c96d916..45d4d37495fd 100644 --- a/arch/powerpc/include/asm/systbl.h +++ b/arch/powerpc/include/asm/systbl.h @@ -392,3 +392,4 @@ SYSCALL(statx) SYSCALL(pkey_alloc) SYSCALL(pkey_free) SYSCALL(pkey_mprotect) +SYSCALL(rseq) diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h index daf1ba97a00c..1e9708632dce 100644 --- a/arch/powerpc/include/asm/unistd.h +++ b/arch/powerpc/include/asm/unistd.h @@ -12,7 +12,7 @@ #include -#define NR_syscalls 387 +#define NR_syscalls 388 #define __NR__exit __NR_exit diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h index 389c36fd8299..ac5ba55066dd 100644 --- a/arch/powerpc/include/uapi/asm/unistd.h +++ b/arch/powerpc/include/uapi/asm/unistd.h @@ -398,5 +398,6 @@ #define __NR_pkey_alloc 384 #define __NR_pkey_free 385 #define __NR_pkey_mprotect 386 +#define __NR_rseq 387 #endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */