drivers/perf: Prevent forced unbinding of PMU drivers

Forcefully unbinding PMU drivers during perf sampling will lead to
a kernel panic, because the perf upper-layer framework call a NULL
pointer in this situation.

To solve this issue, "suppress_bind_attrs" should be set to true, so
that bind/unbind can be disabled via sysfs and prevent unbinding PMU
drivers during perf sampling.

Signed-off-by: Qi Liu <liuqi115@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 1b8e337..87c4be9 100644 (file)
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1718,6 +1718,7 @@ static struct platform_driver cci_pmu_driver = {
        .driver = {
                   .name = DRIVER_NAME,
                   .of_match_table = arm_cci_pmu_matches,
+                  .suppress_bind_attrs = true,
                  },
        .probe = cci_pmu_probe,
        .remove = cci_pmu_remove,

diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c
index d50edef..7b7d23f 100644 (file)
--- a/drivers/perf/arm-ccn.c
+++ b/drivers/perf/arm-ccn.c
@@ -1545,6 +1545,7 @@ static struct platform_driver arm_ccn_driver = {
        .driver = {
                .name = "arm-ccn",
                .of_match_table = arm_ccn_match,
+               .suppress_bind_attrs = true,
        },
        .probe = arm_ccn_probe,
        .remove = arm_ccn_remove,

diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index 518d060..96ed93c 100644 (file)
--- a/drivers/perf/arm_dsu_pmu.c
+++ b/drivers/perf/arm_dsu_pmu.c
@@ -757,6 +757,7 @@ static struct platform_driver dsu_pmu_driver = {
        .driver = {
                .name   = DRVNAME,
                .of_match_table = of_match_ptr(dsu_pmu_of_match),
+               .suppress_bind_attrs = true,
        },
        .probe = dsu_pmu_device_probe,
        .remove = dsu_pmu_device_remove,

diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index 90caba5..4cdb35d 100644 (file)
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -860,6 +860,7 @@ static void smmu_pmu_shutdown(struct platform_device *pdev)
 static struct platform_driver smmu_pmu_driver = {
        .driver = {
                .name = "arm-smmu-v3-pmcg",
+               .suppress_bind_attrs = true,
        },
        .probe = smmu_pmu_probe,
        .remove = smmu_pmu_remove,

diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index d80f487..e51ddb6 100644 (file)
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -1226,6 +1226,7 @@ static struct platform_driver arm_spe_pmu_driver = {
        .driver = {
                .name           = DRVNAME,
                .of_match_table = of_match_ptr(arm_spe_pmu_of_match),
+               .suppress_bind_attrs = true,
        },
        .probe  = arm_spe_pmu_device_probe,
        .remove = arm_spe_pmu_device_remove,

diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 2aed2d9..397540a 100644 (file)
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -707,6 +707,7 @@ static struct platform_driver imx_ddr_pmu_driver = {
        .driver         = {
                .name   = "imx-ddr-pmu",
                .of_match_table = imx_ddr_pmu_dt_ids,
+               .suppress_bind_attrs = true,
        },
        .probe          = ddr_perf_probe,
        .remove         = ddr_perf_remove,

diff --git a/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c b/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
index 71587f1..5e3645c 100644 (file)
--- a/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
@@ -419,6 +419,7 @@ static struct platform_driver hisi_ddrc_pmu_driver = {
        .driver = {
                .name = "hisi_ddrc_pmu",
                .acpi_match_table = ACPI_PTR(hisi_ddrc_pmu_acpi_match),
+               .suppress_bind_attrs = true,
        },
        .probe = hisi_ddrc_pmu_probe,
        .remove = hisi_ddrc_pmu_remove,

diff --git a/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c b/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
index c199de7..5eb8168 100644 (file)
--- a/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
@@ -431,6 +431,7 @@ static struct platform_driver hisi_hha_pmu_driver = {
        .driver = {
                .name = "hisi_hha_pmu",
                .acpi_match_table = ACPI_PTR(hisi_hha_pmu_acpi_match),
+               .suppress_bind_attrs = true,
        },
        .probe = hisi_hha_pmu_probe,
        .remove = hisi_hha_pmu_remove,

diff --git a/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c b/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
index 567d7e6..3e8b5ea 100644 (file)
--- a/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
@@ -421,6 +421,7 @@ static struct platform_driver hisi_l3c_pmu_driver = {
        .driver = {
                .name = "hisi_l3c_pmu",
                .acpi_match_table = ACPI_PTR(hisi_l3c_pmu_acpi_match),
+               .suppress_bind_attrs = true,
        },
        .probe = hisi_l3c_pmu_probe,
        .remove = hisi_l3c_pmu_remove,

diff --git a/drivers/perf/qcom_l2_pmu.c b/drivers/perf/qcom_l2_pmu.c
index 21d6991..4da37f6 100644 (file)
--- a/drivers/perf/qcom_l2_pmu.c
+++ b/drivers/perf/qcom_l2_pmu.c
@@ -1028,6 +1028,7 @@ static struct platform_driver l2_cache_pmu_driver = {
        .driver = {
                .name = "qcom-l2cache-pmu",
                .acpi_match_table = ACPI_PTR(l2_cache_pmu_acpi_match),
+               .suppress_bind_attrs = true,
        },
        .probe = l2_cache_pmu_probe,
        .remove = l2_cache_pmu_remove,

diff --git a/drivers/perf/qcom_l3_pmu.c b/drivers/perf/qcom_l3_pmu.c
index 656e830..9ddb577 100644 (file)
--- a/drivers/perf/qcom_l3_pmu.c
+++ b/drivers/perf/qcom_l3_pmu.c
@@ -814,6 +814,7 @@ static struct platform_driver qcom_l3_cache_pmu_driver = {
        .driver = {
                .name = "qcom-l3cache-pmu",
                .acpi_match_table = ACPI_PTR(qcom_l3_cache_pmu_acpi_match),
+               .suppress_bind_attrs = true,
        },
        .probe = qcom_l3_cache_pmu_probe,
 };

diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
index 51b31d6..aac9823 100644 (file)
--- a/drivers/perf/thunderx2_pmu.c
+++ b/drivers/perf/thunderx2_pmu.c
@@ -1017,6 +1017,7 @@ static struct platform_driver tx2_uncore_driver = {
        .driver = {
                .name           = "tx2-uncore-pmu",
                .acpi_match_table = ACPI_PTR(tx2_uncore_acpi_match),
+               .suppress_bind_attrs = true,
        },
        .probe = tx2_uncore_probe,
        .remove = tx2_uncore_remove,

diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index 46ee680..edac28c 100644 (file)
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -1975,6 +1975,7 @@ static struct platform_driver xgene_pmu_driver = {
                .name           = "xgene-pmu",
                .of_match_table = xgene_pmu_of_match,
                .acpi_match_table = ACPI_PTR(xgene_pmu_acpi_match),
+               .suppress_bind_attrs = true,
        },
 };