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Message-Id: <20200727134939.076902631@linuxfoundation.org>
Date: Mon, 27 Jul 2020 16:05:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Haifeng Wang <wang.wanghaifeng@...wei.com>,
Qi Liu <liuqi115@...wei.com>,
John Garry <john.garry@...wei.com>,
Will Deacon <will@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 132/179] drivers/perf: Fix kernel panic when rmmod PMU modules during perf sampling
From: Qi Liu <liuqi115@...wei.com>
[ Upstream commit bdc5c744c7b6457d18a95c26769dad0e7f480a08 ]
When users try to remove PMU modules during perf sampling, kernel panic
will happen because the pmu->read() is a NULL pointer here.
INFO on HiSilicon hip08 platform as follow:
pc : hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu]
lr : hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu]
sp : ffff800010103e90
x29: ffff800010103e90 x28: ffff0027db0c0e40
x27: ffffa29a76f129d8 x26: ffffa29a77ceb000
x25: ffffa29a773a5000 x24: ffffa29a77392000
x23: ffffddffe5943f08 x22: ffff002784285960
x21: ffff002784285800 x20: ffff0027d2e76c80
x19: ffff0027842859e0 x18: ffff80003498bcc8
x17: ffffa29a76afe910 x16: ffffa29a7583f530
x15: 16151a1512061a1e x14: 0000000000000000
x13: ffffa29a76f1e238 x12: 0000000000000001
x11: 0000000000000400 x10: 00000000000009f0
x9 : ffff8000107b3e70 x8 : ffff0027db0c1890
x7 : ffffa29a773a7000 x6 : 00000007f5131013
x5 : 00000007f5131013 x4 : 09f257d417c00000
x3 : 00000002187bd7ce x2 : ffffa29a38f0f0d8
x1 : ffffa29a38eae268 x0 : ffff0027d2e76c80
Call trace:
hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu]
hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu]
__perf_event_read+0x1a0/0x1f8
flush_smp_call_function_queue+0xa0/0x160
generic_smp_call_function_single_interrupt+0x18/0x20
handle_IPI+0x31c/0x4dc
gic_handle_irq+0x2c8/0x310
el1_irq+0xcc/0x180
arch_cpu_idle+0x4c/0x20c
default_idle_call+0x20/0x30
do_idle+0x1b4/0x270
cpu_startup_entry+0x28/0x30
secondary_start_kernel+0x1a4/0x1fc
To solve the above issue, current module should be registered to kernel,
so that try_module_get() can be invoked when perf sampling starts. This
adds the reference counting of module and could prevent users from removing
modules during sampling.
Reported-by: Haifeng Wang <wang.wanghaifeng@...wei.com>
Signed-off-by: Qi Liu <liuqi115@...wei.com>
Reviewed-by: John Garry <john.garry@...wei.com>
Link: https://lore.kernel.org/r/1594891165-8228-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/perf/arm_smmuv3_pmu.c | 1 +
drivers/perf/fsl_imx8_ddr_perf.c | 1 +
drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c | 1 +
drivers/perf/hisilicon/hisi_uncore_hha_pmu.c | 1 +
drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c | 1 +
5 files changed, 5 insertions(+)
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index 48e28ef93a702..90caba56dfbc1 100644
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -742,6 +742,7 @@ static int smmu_pmu_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smmu_pmu);
smmu_pmu->pmu = (struct pmu) {
+ .module = THIS_MODULE,
.task_ctx_nr = perf_invalid_context,
.pmu_enable = smmu_pmu_enable,
.pmu_disable = smmu_pmu_disable,
diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 90884d14f95fa..2aed2d96f8ae7 100644
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -512,6 +512,7 @@ static int ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base,
{
*pmu = (struct ddr_pmu) {
.pmu = (struct pmu) {
+ .module = THIS_MODULE,
.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
.task_ctx_nr = perf_invalid_context,
.attr_groups = attr_groups,
diff --git a/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c b/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
index 453f1c6a16ca8..c65da06abb041 100644
--- a/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
@@ -378,6 +378,7 @@ static int hisi_ddrc_pmu_probe(struct platform_device *pdev)
ddrc_pmu->sccl_id, ddrc_pmu->index_id);
ddrc_pmu->pmu = (struct pmu) {
.name = name,
+ .module = THIS_MODULE,
.task_ctx_nr = perf_invalid_context,
.event_init = hisi_uncore_pmu_event_init,
.pmu_enable = hisi_uncore_pmu_enable,
diff --git a/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c b/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
index e5af9d7e6e145..ee6e6a1c390a0 100644
--- a/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
@@ -390,6 +390,7 @@ static int hisi_hha_pmu_probe(struct platform_device *pdev)
hha_pmu->sccl_id, hha_pmu->index_id);
hha_pmu->pmu = (struct pmu) {
.name = name,
+ .module = THIS_MODULE,
.task_ctx_nr = perf_invalid_context,
.event_init = hisi_uncore_pmu_event_init,
.pmu_enable = hisi_uncore_pmu_enable,
diff --git a/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c b/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
index 479de4be99eba..c8b98d3a8432a 100644
--- a/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
@@ -380,6 +380,7 @@ static int hisi_l3c_pmu_probe(struct platform_device *pdev)
l3c_pmu->sccl_id, l3c_pmu->index_id);
l3c_pmu->pmu = (struct pmu) {
.name = name,
+ .module = THIS_MODULE,
.task_ctx_nr = perf_invalid_context,
.event_init = hisi_uncore_pmu_event_init,
.pmu_enable = hisi_uncore_pmu_enable,
--
2.25.1
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