From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40G0d73ND7zF28J for ; Wed, 4 Apr 2018 06:12:43 +1000 (AEST) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w33KAkZV029205 for ; Tue, 3 Apr 2018 16:12:40 -0400 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0b-001b2d01.pphosted.com with ESMTP id 2h4fup9vcy-1 (version=TLSv1.2 cipher=AES256-SHA256 bits=256 verify=NOT) for ; Tue, 03 Apr 2018 16:12:40 -0400 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 3 Apr 2018 21:12:38 +0100 From: "Naveen N. Rao" To: Michael Ellerman , Steven Rostedt Cc: linuxppc-dev@lists.ozlabs.org, Paul Mackerras , Nicholas Piggin , Anton Blanchard , sathnaga@linux.vnet.ibm.com Subject: [PATCH v4 00/10] powerpc64/ftrace: Add support for ftrace_modify_call() and a few other fixes Date: Wed, 4 Apr 2018 01:42:15 +0530 Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is v4 of the patches posted at: https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg130739.html This series has been tested using mambo for p8 (hash) and p9 (radix). v4 changes: - flip the paca field from 'ftrace_disabled' to 'ftrace_enabled' to signify a default disable policy to address early boot - add and use helpers to disable/enable ftrace, which addresses 32-bit build issues - a new patch to address issues with function_graph tracing during cpu hotplug. The last three patches are unchanged from the previous series, for the most part (except for the ftrace_disabled -> ftrace_enabled adjustment). The last two patches implement support for ftrace_caller() to conditionally save the register state. This speeds up the function tracer a bit. The existing ftrace_caller() is renamed to ftrace_regs_caller() since we save the entire pt_regs today. A new implementation of ftrace_caller() that saves the minimum register state is provided. We switch between the two variants through ftrace_modify_call(). The necessary support to call into the two different variants from modules is also added. - Naveen Naveen N. Rao (10): powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths powerpc64/ftrace: Disable ftrace during kvm guest entry/exit powerpc64/ftrace: Rearrange #ifdef sections in ftrace.h powerpc64/ftrace: Add helpers to hard disable ftrace powerpc64/ftrace: Delay enabling ftrace on secondary cpus powerpc64/ftrace: Disable ftrace during hotplug powerpc64/kexec: Hard disable ftrace before switching to the new kernel powerpc64/module: Tighten detection of mcount call sites with -mprofile-kernel powerpc64/ftrace: Use the generic version of ftrace_replace_code() powerpc64/ftrace: Implement support for ftrace_regs_caller() arch/powerpc/include/asm/ftrace.h | 27 +++- arch/powerpc/include/asm/module.h | 3 + arch/powerpc/include/asm/paca.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/machine_kexec.c | 2 + arch/powerpc/kernel/module_64.c | 43 +++-- arch/powerpc/kernel/setup_64.c | 7 + arch/powerpc/kernel/smp.c | 12 ++ arch/powerpc/kernel/trace/ftrace.c | 210 ++++++++++++++++++++----- arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 85 +++++++++- arch/powerpc/kernel/trace/ftrace_64_pg.S | 4 + arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 + 12 files changed, 336 insertions(+), 67 deletions(-) -- 2.16.2