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[patch V2 14/28] x86/perf/intel_uncore: Make PCI and MSR uncore independent

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject [patch V2 14/28] x86/perf/intel_uncore: Make PCI and MSR uncore independent
Date 2016-02-22 12:20 +0100
Message-ID <r4WH1-4WG-53@gated-at.bofh.it> (permalink)
References <r4Wxk-4RK-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/cpu/perf_event_intel_uncore.c |   34 +++++++++++++-------------
 1 file changed, 18 insertions(+), 16 deletions(-)

Index: b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
===================================================================
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_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)
@@ -1319,7 +1319,7 @@ 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);
@@ -1344,7 +1344,7 @@ static void __init uncore_cpu_setup(void
 /* 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;
 
@@ -1355,12 +1355,15 @@ static int __init uncore_cpumask_init(vo
 		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);
 	}
@@ -1370,7 +1373,7 @@ static int __init uncore_cpumask_init(vo
 
 static int __init intel_uncore_init(void)
 {
-	int ret;
+	int pret, cret, ret;
 
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
 		return -ENODEV;
@@ -1380,15 +1383,14 @@ 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();

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[patch V2 00/28] x86/perf/intel/uncore|rapl: Fix error handling and  sanitize pmu management Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 18/28] x86/perf/intel_rapl: Make Knights Landings support  functional Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
    Re: [patch V2 18/28] x86/perf/intel_rapl: Make Knights Landings  support functional Borislav Petkov <bp@alien8.de> - 2016-02-22 21:40 +0100
  [patch V2 13/28] x86/perf/intel_uncore: Clear all hardware state on  exit Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
    Re: [patch V2 13/28] x86/perf/intel_uncore: Clear all hardware state  on exit Peter Zijlstra <peterz@infradead.org> - 2016-02-22 13:00 +0100
      Re: [patch V2 13/28] x86/perf/intel_uncore: Clear all hardware state  on exit Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 13:10 +0100
  [patch V2 17/28] x86/perf/cqm: Get rid of the silly for_each_cpu  lookups Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 16/28] x86/perf/intel_uncore: Make it modular Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 12/28] x86/perf/uncore: Track packages not per cpu data Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 24/28] x86/perf/intel/rapl: Make pmu lock raw Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 02/28] x86/perf/intel/uncore: Simplify error rollback Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 03/28] x86/perf/intel/uncore: Fix error handling Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 22/28] x86/perf/intel/rapl: Cleanup the printk output Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
    Re: [patch V2 22/28] x86/perf/intel/rapl: Cleanup the printk output Andi Kleen <andi@firstfloor.org> - 2016-02-22 19:50 +0100
      Re: [patch V2 22/28] x86/perf/intel/rapl: Cleanup the printk  output Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 20:00 +0100
  [patch V2 08/28] x86/perf/uncore: Make uncore_pcibus_to_physid static Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 11/28] x86/topology: Create logical package id Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
    Re: [patch V2 11/28] x86/topology: Create logical package id Andi Kleen <andi@firstfloor.org> - 2016-02-22 20:00 +0100
      Re: [patch V2 11/28] x86/topology: Create logical package id Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 20:10 +0100
  [patch V2 14/28] x86/perf/intel_uncore: Make PCI and MSR uncore  independent Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 23/28] x86/perf/intel/rapl: Refactor code some more Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 07/28] x86/perf/intel_uncore: Make code readable Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 20/28] x86/perf/intel/rapl: Sanitize the quirk handling Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 25/28] x86/perf/intel/rapl: Utilize event->pmu_private Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  [patch V2 05/28] x86/perf/intel_uncore: Cleanup hardware on exit Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 12:20 +0100
  Re: [patch V2 00/28] x86/perf/intel/uncore|rapl: Fix error handling and sanitize pmu management Andi Kleen <andi@firstfloor.org> - 2016-02-22 20:00 +0100

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