linux-kernel - [PATCH] x86, perf, uncore: Don't make MSR uncore depend on PCI uncore

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <1435707241-6865-1-git-send-email-andi@firstfloor.org>
Date:	Tue, 30 Jun 2015 16:34:01 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH] x86, perf, uncore: Don't make MSR uncore depend on PCI uncore

From: Andi Kleen <ak@...ux.intel.com>

Several sytems, such as my laptop, don't expose the PCI devices
for the PCI uncore measurements. But the MSRs for the CBOX and ARB
uncores are always available. Currently the init code doesn't
initialize the MSR uncores when the PCI uncore registration fails.
Stop it from doing that and always try to register the MSR uncores.

This makes the pci uncore exit function unused. We'll need it later
when the uncore becomes modular, so instead of removing it I just
marked it with module_exit right now (which discards it)

v2: Avoid registering notifier when both initialization calls fail
v3: Return error when both registrations fail.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/cpu/perf_event_intel_uncore.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index b57a09d..31ac78b 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -952,6 +952,8 @@ static void __init uncore_pci_exit(void)
 		uncore_types_exit(uncore_pci_uncores);
 	}
 }
+module_exit(uncore_pci_exit);
+/* XXX: need exit code for rest of intel_uncore_init too */
 
 /* CPU hot plug/unplug are serialized by cpu_add_remove_lock mutex */
 static LIST_HEAD(boxes_to_free);
@@ -1287,7 +1289,7 @@ static void __init uncore_cpumask_init(void)
 
 static int __init intel_uncore_init(void)
 {
-	int ret;
+	int ret1, ret2;
 
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
 		return -ENODEV;
@@ -1295,19 +1297,13 @@ static int __init intel_uncore_init(void)
 	if (cpu_has_hypervisor)
 		return -ENODEV;
 
-	ret = uncore_pci_init();
-	if (ret)
-		goto fail;
-	ret = uncore_cpu_init();
-	if (ret) {
-		uncore_pci_exit();
-		goto fail;
-	}
-	uncore_cpumask_init();
-
-	uncore_pmus_register();
+	ret1 = uncore_pci_init();
+	ret2 = uncore_cpu_init();
+	if (!ret1 || !ret2) {
+		uncore_cpumask_init();
+		uncore_pmus_register();
+	} else
+		return -ENODEV;
 	return 0;
-fail:
-	return ret;
 }
 device_initcall(intel_uncore_init);
-- 
2.4.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/