From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp01.in.ibm.com (e28smtp01.in.ibm.com [125.16.236.1]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 51C381A0038 for ; Tue, 16 Feb 2016 17:37:52 +1100 (AEDT) Received: from localhost by e28smtp01.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 16 Feb 2016 12:07:49 +0530 Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay03.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u1G6bjdn3146060 for ; Tue, 16 Feb 2016 12:07:46 +0530 Received: from d28av03.in.ibm.com (localhost [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u1G6bifg030106 for ; Tue, 16 Feb 2016 12:07:44 +0530 From: Anshuman Khandual To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH V11_RESEND 03/10] powerpc/perf: Restore privilege level filter support for BHRB Date: Tue, 16 Feb 2016 12:07:03 +0530 Message-Id: <1455604630-16214-4-git-send-email-khandual@linux.vnet.ibm.com> In-Reply-To: <1455604630-16214-1-git-send-email-khandual@linux.vnet.ibm.com> References: <1455604630-16214-1-git-send-email-khandual@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 'commit 9de5cb0f6df8 ("powerpc/perf: Add per-event excludes on Power8")' broke the PMU based BHRB privilege level filter. BHRB depends on the same MMCR0 bits for privilege level filter which was used to freeze all the PMCs as a group. Once we moved to individual event based privilege filters through MMCR2 register on POWER8, event associated privilege filters are no longer applicable to the BHRB captured branches. This patch solves the problem by restoring to the previous method of privilege level filters for the event in case BHRB based branch stack sampling is requested. This patch also changes 'check_excludes' for the same reason. Signed-off-by: Anshuman Khandual --- arch/powerpc/perf/core-book3s.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index a158923..0930a07 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -941,7 +941,7 @@ static int power_check_constraints(struct cpu_hw_events *cpuhw, * added events. */ static int check_excludes(struct perf_event **ctrs, unsigned int cflags[], - int n_prev, int n_new) + int n_prev, int n_new, unsigned int bhrb_users) { int eu = 0, ek = 0, eh = 0; int i, n, first; @@ -950,9 +950,10 @@ static int check_excludes(struct perf_event **ctrs, unsigned int cflags[], /* * If the PMU we're on supports per event exclude settings then we * don't need to do any of this logic. NB. This assumes no PMU has both - * per event exclude and limited PMCs. + * per event exclude and limited PMCs. But again if the event has also + * requested for branch stack sampling, then process the logic here. */ - if (ppmu->flags & PPMU_ARCH_207S) + if ((ppmu->flags & PPMU_ARCH_207S) && !bhrb_users) return 0; n = n_prev + n_new; @@ -1270,7 +1271,7 @@ static void power_pmu_enable(struct pmu *pmu) goto out; } - if (!(ppmu->flags & PPMU_ARCH_207S)) { + if (!(ppmu->flags & PPMU_ARCH_207S) || cpuhw->bhrb_users) { /* * Add in MMCR0 freeze bits corresponding to the attr.exclude_* * bits for the first event. We have already checked that all @@ -1295,7 +1296,7 @@ static void power_pmu_enable(struct pmu *pmu) mtspr(SPRN_MMCR1, cpuhw->mmcr[1]); mtspr(SPRN_MMCR0, (cpuhw->mmcr[0] & ~(MMCR0_PMC1CE | MMCR0_PMCjCE)) | MMCR0_FC); - if (ppmu->flags & PPMU_ARCH_207S) + if ((ppmu->flags & PPMU_ARCH_207S) && !cpuhw->bhrb_users) mtspr(SPRN_MMCR2, cpuhw->mmcr[3]); /* @@ -1447,7 +1448,8 @@ static int power_pmu_add(struct perf_event *event, int ef_flags) if (cpuhw->txn_flags & PERF_PMU_TXN_ADD) goto nocheck; - if (check_excludes(cpuhw->event, cpuhw->flags, n0, 1)) + if (check_excludes(cpuhw->event, cpuhw->flags, + n0, 1, cpuhw->bhrb_users)) goto out; if (power_check_constraints(cpuhw, cpuhw->events, cpuhw->flags, n0 + 1)) goto out; @@ -1650,7 +1652,7 @@ static int power_pmu_commit_txn(struct pmu *pmu) } n = cpuhw->n_events; - if (check_excludes(cpuhw->event, cpuhw->flags, 0, n)) + if (check_excludes(cpuhw->event, cpuhw->flags, 0, n, cpuhw->bhrb_users)) return -EAGAIN; i = power_check_constraints(cpuhw, cpuhw->events, cpuhw->flags, n); if (i < 0) @@ -1863,10 +1865,10 @@ static int power_pmu_event_init(struct perf_event *event) events[n] = ev; ctrs[n] = event; cflags[n] = flags; - if (check_excludes(ctrs, cflags, n, 1)) + cpuhw = &get_cpu_var(cpu_hw_events); + if (check_excludes(ctrs, cflags, n, 1, cpuhw->bhrb_users)) return -EINVAL; - cpuhw = &get_cpu_var(cpu_hw_events); err = power_check_constraints(cpuhw, events, cflags, n + 1); if (has_branch_stack(event)) { -- 2.1.0