From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753191AbdDKC65 (ORCPT ); Mon, 10 Apr 2017 22:58:57 -0400 Received: from mga01.intel.com ([192.55.52.88]:46978 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753006AbdDKC6z (ORCPT ); Mon, 10 Apr 2017 22:58:55 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.37,184,1488873600"; d="scan'208";a="954557415" From: Jin Yao To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org, mingo@redhat.com, alexander.shishkin@linux.intel.com Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com, kan.liang@intel.com, yao.jin@intel.com, linuxppc-dev@lists.ozlabs.org, Jin Yao Subject: [PATCH v3 2/5] perf/x86/intel: Record branch type Date: Tue, 11 Apr 2017 18:56:30 +0800 Message-Id: <1491908193-25418-3-git-send-email-yao.jin@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1491908193-25418-1-git-send-email-yao.jin@linux.intel.com> References: <1491908193-25418-1-git-send-email-yao.jin@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Perf already has support for disassembling the branch instruction and using the branch type for filtering. The patch just records the branch type in perf_branch_entry. Before recording, the patch converts the x86 branch classification to common branch classification. Signed-off-by: Jin Yao --- arch/x86/events/intel/lbr.c | 53 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c index 81b321a..6968c63 100644 --- a/arch/x86/events/intel/lbr.c +++ b/arch/x86/events/intel/lbr.c @@ -109,6 +109,9 @@ enum { X86_BR_ZERO_CALL = 1 << 15,/* zero length call */ X86_BR_CALL_STACK = 1 << 16,/* call stack */ X86_BR_IND_JMP = 1 << 17,/* indirect jump */ + + X86_BR_TYPE_SAVE = 1 << 18,/* indicate to save branch type */ + }; #define X86_BR_PLM (X86_BR_USER | X86_BR_KERNEL) @@ -670,6 +673,10 @@ static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event) if (br_type & PERF_SAMPLE_BRANCH_CALL) mask |= X86_BR_CALL | X86_BR_ZERO_CALL; + + if (br_type & PERF_SAMPLE_BRANCH_TYPE_SAVE) + mask |= X86_BR_TYPE_SAVE; + /* * stash actual user request into reg, it may * be used by fixup code for some CPU @@ -923,6 +930,44 @@ static int branch_type(unsigned long from, unsigned long to, int abort) return ret; } +#define X86_BR_TYPE_MAP_MAX 16 + +static int +common_branch_type(int type) +{ + int i, mask; + const int branch_map[X86_BR_TYPE_MAP_MAX] = { + PERF_BR_CALL, /* X86_BR_CALL */ + PERF_BR_RET, /* X86_BR_RET */ + PERF_BR_SYSCALL, /* X86_BR_SYSCALL */ + PERF_BR_SYSRET, /* X86_BR_SYSRET */ + PERF_BR_INT, /* X86_BR_INT */ + PERF_BR_IRET, /* X86_BR_IRET */ + PERF_BR_JCC, /* X86_BR_JCC */ + PERF_BR_JMP, /* X86_BR_JMP */ + PERF_BR_IRQ, /* X86_BR_IRQ */ + PERF_BR_IND_CALL, /* X86_BR_IND_CALL */ + PERF_BR_NONE, /* X86_BR_ABORT */ + PERF_BR_NONE, /* X86_BR_IN_TX */ + PERF_BR_NONE, /* X86_BR_NO_TX */ + PERF_BR_CALL, /* X86_BR_ZERO_CALL */ + PERF_BR_NONE, /* X86_BR_CALL_STACK */ + PERF_BR_IND_JMP, /* X86_BR_IND_JMP */ + }; + + type >>= 2; /* skip X86_BR_USER and X86_BR_KERNEL */ + mask = ~(~0 << 1); + + for (i = 0; i < X86_BR_TYPE_MAP_MAX; i++) { + if (type & mask) + return branch_map[i]; + + type >>= 1; + } + + return PERF_BR_NONE; +} + /* * implement actual branch filter based on user demand. * Hardware may not exactly satisfy that request, thus @@ -939,7 +984,8 @@ intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) bool compress = false; /* if sampling all branches, then nothing to filter */ - if ((br_sel & X86_BR_ALL) == X86_BR_ALL) + if (((br_sel & X86_BR_ALL) == X86_BR_ALL) && + ((br_sel & X86_BR_TYPE_SAVE) != X86_BR_TYPE_SAVE)) return; for (i = 0; i < cpuc->lbr_stack.nr; i++) { @@ -960,6 +1006,11 @@ intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) cpuc->lbr_entries[i].from = 0; compress = true; } + + if ((br_sel & X86_BR_TYPE_SAVE) == X86_BR_TYPE_SAVE) + cpuc->lbr_entries[i].type = common_branch_type(type); + else + cpuc->lbr_entries[i].type = PERF_BR_NONE; } if (!compress) -- 2.7.4