Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756022AbZCEPcM (ORCPT ); Thu, 5 Mar 2009 10:32:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754036AbZCEPb5 (ORCPT ); Thu, 5 Mar 2009 10:31:57 -0500 Received: from mga09.intel.com ([134.134.136.24]:16908 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752488AbZCEPb4 (ORCPT ); Thu, 5 Mar 2009 10:31:56 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,307,1233561600"; d="scan'208";a="391940601" Date: Thu, 5 Mar 2009 16:31:49 +0100 From: Markus Metzger To: linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com Cc: markus.t.metzger@intel.com, markus.t.metzger@gmail.com, roland@redhat.com, eranian@googlemail.com, oleg@redhat.com, juan.villacis@intel.com, ak@linux.jf.intel.com, srostedt@redhat.com Subject: [patch 4/4] x86, hw-branch-tracer: add selftest Message-ID: <20090305163149.A9720@sedona.ch.intel.com> Mime-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.2.5i Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3923 Lines: 123 Add a selftest to the hw-branch-tracer. Signed-off-by: Markus Metzger --- Index: gits/kernel/trace/trace_hw_branches.c =================================================================== --- gits.orig/kernel/trace/trace_hw_branches.c 2009-03-03 10:45:35.000000000 +0100 +++ gits/kernel/trace/trace_hw_branches.c 2009-03-03 10:50:04.000000000 +0100 @@ -344,7 +344,10 @@ struct tracer bts_tracer __read_mostly = .start = bts_trace_start, .stop = bts_trace_stop, .open = trace_bts_prepare, - .close = trace_bts_close + .close = trace_bts_close, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_hw_branches, +#endif /* CONFIG_FTRACE_SELFTEST */ }; __init static int init_bts_trace(void) Index: gits/kernel/trace/trace_selftest.c =================================================================== --- gits.orig/kernel/trace/trace_selftest.c 2009-03-03 09:32:43.000000000 +0100 +++ gits/kernel/trace/trace_selftest.c 2009-03-03 10:51:27.000000000 +0100 @@ -15,6 +15,7 @@ static inline int trace_valid_entry(stru case TRACE_BRANCH: case TRACE_GRAPH_ENT: case TRACE_GRAPH_RET: + case TRACE_HW_BRANCHES: return 1; } return 0; @@ -693,3 +694,56 @@ trace_selftest_startup_branch(struct tra return ret; } #endif /* CONFIG_BRANCH_TRACER */ + +#ifdef CONFIG_HW_BRANCH_TRACER +int +trace_selftest_startup_hw_branches(struct tracer *trace, + struct trace_array *tr) +{ + unsigned long count; + int ret; + struct trace_iterator iter; + struct tracer tracer; + + if (!trace->open) { + printk(KERN_CONT "missing open function..."); + return -1; + } + + /* start the tracing */ + ret = tracer_init(trace, tr); + if (ret) { + warn_failed_init_tracer(trace, ret); + return ret; + } + + /* the hw-branch tracer needs to collect the trace from the various + * cpu trace buffers - before tracing is stopped. */ + memset(&iter, 0, sizeof(iter)); + memcpy(&tracer, trace, sizeof(tracer)); + + iter.trace = &tracer; + iter.tr = tr; + iter.pos = -1; + mutex_init(&iter.mutex); + + trace->open(&iter); + + mutex_destroy(&iter.mutex); + + /* stop the tracing. */ + tracing_stop(); + + /* check the trace buffer */ + ret = trace_test_buffer(tr, &count); + trace->reset(tr); + tracing_start(); + + if (!ret && !count) { + printk(KERN_CONT "no entries found.."); + ret = -1; + } + + return ret; +} +#endif /* CONFIG_HW_BRANCH_TRACER */ Index: gits/kernel/trace/trace.h =================================================================== --- gits.orig/kernel/trace/trace.h 2009-03-03 09:32:43.000000000 +0100 +++ gits/kernel/trace/trace.h 2009-03-03 10:50:04.000000000 +0100 @@ -555,6 +555,8 @@ extern int trace_selftest_startup_syspro struct trace_array *tr); extern int trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr); +extern int trace_selftest_startup_hw_branches(struct tracer *trace, + struct trace_array *tr); #endif /* CONFIG_FTRACE_STARTUP_TEST */ extern void *head_page(struct trace_array_cpu *data); --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. 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