linux-kernel - [tip:perf/urgent] perf/x86: Set pmu->module in Intel PMU modules

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Message-ID: <tip-74545f63890e38520eb4d1dbedcadaa9c0dbc824@git.kernel.org>
Date:   Thu, 5 Jan 2017 07:07:05 -0800
From:   tip-bot for David Carrillo-Cisneros <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, pjt@...gle.com, bp@...e.de, mingo@...nel.org,
        torvalds@...ux-foundation.org, eranian@...gle.com,
        alexander.shishkin@...ux.intel.com, dave.hansen@...ux.intel.com,
        tglx@...utronix.de, jolsa@...hat.com,
        srinivas.pandruvada@...ux.intel.com, acme@...hat.com,
        hpa@...or.com, kan.liang@...el.com, linux-kernel@...r.kernel.org,
        davidcc@...gle.com
Subject: [tip:perf/urgent] perf/x86: Set pmu->module in Intel PMU modules

Commit-ID:  74545f63890e38520eb4d1dbedcadaa9c0dbc824
Gitweb:     http://git.kernel.org/tip/74545f63890e38520eb4d1dbedcadaa9c0dbc824
Author:     David Carrillo-Cisneros <davidcc@...gle.com>
AuthorDate: Thu, 22 Dec 2016 17:17:40 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 5 Jan 2017 09:13:55 +0100

perf/x86: Set pmu->module in Intel PMU modules

The conversion of Intel PMU drivers into modules did not include reference
counting. The machine will crash when attempting to  access deleted code
if an event from a module PMU is started and the module removed before the
event is destroyed.

i.e. this crashes the machine:

	$ insmod intel-rapl-perf.ko
	$ perf stat -e power/energy-cores/ -C 0 &
	$ rmmod intel-rapl-perf.ko

Set THIS_MODULE to pmu->module in Intel module PMUs so that generic code
can handle reference counting and deny rmmod while an event still exists.

Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1482455860-116269-1-git-send-email-davidcc@google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/cstate.c | 2 ++
 arch/x86/events/intel/rapl.c   | 1 +
 arch/x86/events/intel/uncore.c | 1 +
 3 files changed, 4 insertions(+)

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index fec8a46..1076c9a 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -434,6 +434,7 @@ static struct pmu cstate_core_pmu = {
 	.stop		= cstate_pmu_event_stop,
 	.read		= cstate_pmu_event_update,
 	.capabilities	= PERF_PMU_CAP_NO_INTERRUPT,
+	.module		= THIS_MODULE,
 };
 
 static struct pmu cstate_pkg_pmu = {
@@ -447,6 +448,7 @@ static struct pmu cstate_pkg_pmu = {
 	.stop		= cstate_pmu_event_stop,
 	.read		= cstate_pmu_event_update,
 	.capabilities	= PERF_PMU_CAP_NO_INTERRUPT,
+	.module		= THIS_MODULE,
 };
 
 static const struct cstate_model nhm_cstates __initconst = {
diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index bd34124..17c3564 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -697,6 +697,7 @@ static int __init init_rapl_pmus(void)
 	rapl_pmus->pmu.start		= rapl_pmu_event_start;
 	rapl_pmus->pmu.stop		= rapl_pmu_event_stop;
 	rapl_pmus->pmu.read		= rapl_pmu_event_read;
+	rapl_pmus->pmu.module		= THIS_MODULE;
 	return 0;
 }
 
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 97c246f..8c4ccdc 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -733,6 +733,7 @@ static int uncore_pmu_register(struct intel_uncore_pmu *pmu)
 			.start		= uncore_pmu_event_start,
 			.stop		= uncore_pmu_event_stop,
 			.read		= uncore_pmu_event_read,
+			.module		= THIS_MODULE,
 		};
 	} else {
 		pmu->pmu = *pmu->type->pmu;