linux-kernel - Re: [tip:perf/core] powerpc, perf: Use common PMU interrupt disabled code

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Message-ID: <alpine.DEB.2.10.1406191435440.27913@vincent-weaver-1.umelst.maine.edu>
Date:	Thu, 19 Jun 2014 14:40:09 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	mingo@...nel.org, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, cody@...ux.vnet.ibm.com,
	peterz@...radead.org, mpe@...erman.id.au, benh@...nel.crashing.org,
	vincent.weaver@...ne.edu, tglx@...utronix.de,
	fengguang.wu@...el.com
Subject: Re: [tip:perf/core] powerpc, perf:  Use common PMU interrupt disabled
 code


Brown-paper bag time, the patch didn't compile due to missing parenthesis.
I really need to get a new powerpc machine to test on, haven't had one 
since both my g3 and g4 laptops died.

Problem was caught by the kbuild test robot.

The below patch is a corrected version of the original, I could
probably provide an incremental one if that's better.

Vince

---

[PATCH 4/6] powerpc,perf: Use common PMU interrupt disabled code

Transition to using the new generic PERF_PMU_CAP_NO_INTERRUPT method for
failing a sampling event when no PMU interrupt is available.

Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index e0766b8..3de7920 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -387,8 +387,7 @@ static int h_24x7_event_init(struct perf_event *event)
 	    event->attr.exclude_hv     ||
 	    event->attr.exclude_idle   ||
 	    event->attr.exclude_host   ||
-	    event->attr.exclude_guest  ||
-	    is_sampling_event(event)) /* no sampling */
+	    event->attr.exclude_guest)
 		return -EINVAL;
 
 	/* no branch sampling */
@@ -513,6 +512,9 @@ static int hv_24x7_init(void)
 	if (!hv_page_cache)
 		return -ENOMEM;
 
+	/* sampling not supported */
+	h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
+
 	r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
 	if (r)
 		return r;
diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c
index c9d399a..6d9c8e4 100644
--- a/arch/powerpc/perf/hv-gpci.c
+++ b/arch/powerpc/perf/hv-gpci.c
@@ -210,8 +210,7 @@ static int h_gpci_event_init(struct perf_event *event)
 	    event->attr.exclude_hv     ||
 	    event->attr.exclude_idle   ||
 	    event->attr.exclude_host   ||
-	    event->attr.exclude_guest  ||
-	    is_sampling_event(event)) /* no sampling */
+	    event->attr.exclude_guest)
 		return -EINVAL;
 
 	/* no branch sampling */
@@ -284,6 +283,9 @@ static int hv_gpci_init(void)
 		return -ENODEV;
 	}
 
+	/* sampling not supported */
+	h_gpci_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
+
 	r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1);
 	if (r)
 		return r;
--
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