linux-kernel - [tip:perf/core] perf/x86/intel/uncore: Make PCI and MSR uncore independent

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Date:	Mon, 29 Feb 2016 03:08:27 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jacob.jun.pan@...ux.intel.com, eranian@...gle.com,
	ak@...ux.intel.com, jolsa@...hat.com, hpa@...or.com, bp@...en8.de,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	mingo@...nel.org, andi.kleen@...el.com, kan.liang@...el.com,
	peterz@...radead.org, harish.chegondi@...el.com,
	vincent.weaver@...ne.edu, linux-kernel@...r.kernel.org,
	acme@...hat.com
Subject: [tip:perf/core] perf/x86/intel/uncore: Make PCI and MSR uncore
 independent

Commit-ID:  5485592c17954b2a91fbd12980af596dc666079d
Gitweb:     http://git.kernel.org/tip/5485592c17954b2a91fbd12980af596dc666079d
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 22 Feb 2016 22:19:17 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 29 Feb 2016 09:35:19 +0100

perf/x86/intel/uncore: Make PCI and MSR uncore independent

Andi wanted to do this before, but the patch fell down the cracks. Implement
it with the proper error handling.

Requested-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andi Kleen <andi.kleen@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Harish Chegondi <harish.chegondi@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: linux-kernel@...r.kernel.org
Link: http://lkml.kernel.org/r/20160222221011.799159968@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/uncore.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 5ad8e52..7012d18 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -1023,7 +1023,7 @@ static int __init uncore_pci_init(void)
 		ret = skl_uncore_pci_init();
 		break;
 	default:
-		return 0;
+		return -ENODEV;
 	}
 
 	if (ret)
@@ -1324,7 +1324,7 @@ static int __init uncore_cpu_init(void)
 		knl_uncore_cpu_init();
 		break;
 	default:
-		return 0;
+		return -ENODEV;
 	}
 
 	ret = uncore_types_init(uncore_msr_uncores, true);
@@ -1349,7 +1349,7 @@ static void __init uncore_cpu_setup(void *dummy)
 /* Lazy to avoid allocation of a few bytes for the normal case */
 static __initdata DECLARE_BITMAP(packages, MAX_LOCAL_APIC);
 
-static int __init uncore_cpumask_init(void)
+static int __init uncore_cpumask_init(bool msr)
 {
 	unsigned int cpu;
 
@@ -1360,12 +1360,15 @@ static int __init uncore_cpumask_init(void)
 		if (test_and_set_bit(pkg, packages))
 			continue;
 		/*
-		 * The first online cpu of each package takes the refcounts
-		 * for all other online cpus in that package.
+		 * The first online cpu of each package allocates and takes
+		 * the refcounts for all other online cpus in that package.
+		 * If msrs are not enabled no allocation is required.
 		 */
-		ret = uncore_cpu_prepare(cpu);
-		if (ret)
-			return ret;
+		if (msr) {
+			ret = uncore_cpu_prepare(cpu);
+			if (ret)
+				return ret;
+		}
 		uncore_event_init_cpu(cpu);
 		smp_call_function_single(cpu, uncore_cpu_setup, NULL, 1);
 	}
@@ -1375,7 +1378,7 @@ static int __init uncore_cpumask_init(void)
 
 static int __init intel_uncore_init(void)
 {
-	int ret;
+	int pret, cret, ret;
 
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
 		return -ENODEV;
@@ -1385,15 +1388,14 @@ static int __init intel_uncore_init(void)
 
 	max_packages = topology_max_packages();
 
-	ret = uncore_pci_init();
-	if (ret)
-		return ret;
-	ret = uncore_cpu_init();
-	if (ret)
-		goto err;
+	pret = uncore_pci_init();
+	cret = uncore_cpu_init();
+
+	if (cret && pret)
+		return -ENODEV;
 
 	cpu_notifier_register_begin();
-	ret = uncore_cpumask_init();
+	ret = uncore_cpumask_init(!cret);
 	if (ret)
 		goto err;
 	cpu_notifier_register_done();