[PATCH openEuler-22.03-LTS-SP2 0/2] Fix NULL pointer and Keep PERF_PMU_CAP_EXCLUSIVE
1) Fix NULL pointer for hisi_ptt 2) Keep to advertise PERF_PMU_CAP_EXCLUSIVE. Such ptt pmus can only have one event scheduled at a time. Junhao He (2): hwtracing: hisi_ptt: Add dummy callback pmu::read() hwtracing: hisi_ptt: Keep to advertise PERF_PMU_CAP_EXCLUSIVE drivers/hwtracing/ptt/hisi_ptt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) -- 2.33.0
driver inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7F2F2 CVE: NA -------------------------------- When the perf is tracing hisi_ptt pmu and then stopped immediately with "ctrl + c". the perf will call pmu::read() to updata trace data, but driver does not implement the callback pmu::read(). Will cause the following panic. root@localhost:/# perf record -m,16M -e hisi_ptt0_2/xxx/ -C 0 ^C [ perf record: Woken up 0 times to write data ] [ 3693.734230] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 3693.747212] Mem abort info: [ 3693.749991] ESR = 0x0000000086000006 [ 3693.753725] EC = 0x21: IABT (current EL), IL = 32 bits [ 3693.759022] SET = 0, FnV = 0 [ 3693.762062] EA = 0, S1PTW = 0 [ 3693.765188] FSC = 0x06: level 2 translation fault [ 3693.770051] user pgtable: 4k pages, 48-bit VAs, pgdp=000008302912e000 [ 3693.776477] [0000000000000000] pgd=0800083019fc2003, p4d=0800083019fc2003, pud=0800083019fca003, pmd=0000000000000000 [ 3693.787072] Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP [ 3693.822414] pstate: 614008c9 (nZCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=-c) [ 3693.829361] pc : 0x0 [ 3693.831534] lr : __perf_event_read+0x110/0x208 [ 3693.835966] sp : ffff800008003eb0 [ 3693.839266] x29: ffff800008003eb0 x28: ffffa4f0d14f1100 x27: 0000000000000001 [ 3693.846388] x26: ffffa4f0d14f1100 x25: 0000000000000000 x24: 0000000000000000 [ 3693.853509] x23: ffff082197adf4f8 x22: 0000000000000000 x21: ffff80001f8ebc28 [ 3693.860630] x20: ffff08478be506c8 x19: ffff083028f22220 x18: 0000000000000000 [ 3693.867751] x17: ffff6356bb355000 x16: ffff800008000000 x15: 0000000000000000 [ 3693.874871] x14: 0000000000000002 x13: 0000000000000000 x12: 0000000000000040 [ 3693.881992] x11: ffff08300a915b40 x10: ffff08300a915b42 x9 : ffffa4f0ce6ee5a0 [ 3693.889113] x8 : ffff083000401268 x7 : 0000000000000000 x6 : 000000108dce8ee0 [ 3693.896234] x5 : 01ffffffffffffff x4 : 0000000000000000 x3 : 000000000112024a [ 3693.903355] x2 : 000000003cadb114 x1 : 0000000000000000 x0 : ffff083028f22220 [ 3693.910476] Call trace: [ 3693.912908] 0x0 [ 3693.914733] __flush_smp_call_function_queue+0x154/0x258 [ 3693.920032] generic_smp_call_function_single_interrupt+0x1c/0x30 [ 3693.926111] ipi_handler+0x90/0x2d0 [ 3693.929588] handle_percpu_devid_irq+0x90/0x250 [ 3693.934105] generic_handle_domain_irq+0x34/0x58 [ 3693.938708] gic_handle_irq+0x12c/0x270 [ 3693.942530] call_on_irq_stack+0x24/0x30 [ 3693.946439] do_interrupt_handler+0x88/0x98 [ 3693.950608] el1_interrupt+0x48/0xe8 [ 3693.954171] el1h_64_irq_handler+0x18/0x28 [ 3693.958253] el1h_64_irq+0x78/0x80 [ 3693.961641] default_idle_call+0x5c/0x180 [ 3693.965636] do_idle+0x25c/0x2d0 [ 3693.968851] cpu_startup_entry+0x2c/0x40 [ 3693.972760] rest_init+0xec/0xf8 [ 3693.975974] arch_call_rest_init+0x18/0x20 [ 3693.980057] start_kernel+0x41c/0x7f0 [ 3693.983705] __primary_switched+0xbc/0xd0 [ 3693.987702] Code: ???????? ???????? ???????? ???????? (????????) [ 3693.993781] ---[ end trace 0000000000000000 ]--- [ 3694.182495] Kernel panic - not syncing: Oops: Fatal exception in interrupt [ 3694.189354] SMP: stopping secondary CPUs [ 3694.193276] Kernel Offset: 0x24f0c6470000 from 0xffff800008000000 [ 3694.199354] PHYS_OFFSET: 0x0 [ 3694.202220] CPU features: 0x000000,00d005be,12affea7 [ 3694.207170] Memory Limit: none [ 3694.389463] ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]--- Signed-off-by: Junhao He <hejunhao3@huawei.com> --- drivers/hwtracing/ptt/hisi_ptt.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c index aab16baf3913..1c8113215885 100644 --- a/drivers/hwtracing/ptt/hisi_ptt.c +++ b/drivers/hwtracing/ptt/hisi_ptt.c @@ -1178,6 +1178,10 @@ static void hisi_ptt_pmu_del(struct perf_event *event, int flags) hisi_ptt_pmu_stop(event, PERF_EF_UPDATE); } +static void hisi_ptt_pmu_read(struct perf_event *event) +{ +} + static void hisi_ptt_remove_cpuhp_instance(void *hotplug_node) { cpuhp_state_remove_instance_nocalls(hisi_ptt_pmu_online, hotplug_node); @@ -1221,6 +1225,7 @@ static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt) .stop = hisi_ptt_pmu_stop, .add = hisi_ptt_pmu_add, .del = hisi_ptt_pmu_del, + .read = hisi_ptt_pmu_read, }; reg = readl(hisi_ptt->iobase + HISI_PTT_LOCATION); -- 2.33.0
driver inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7F2F2 CVE: NA -------------------------------- Keep to advertise PERF_PMU_CAP_EXCLUSIVE. Such pmus can only have one event scheduled at a time, and the perf tool will report device busy. Signed-off-by: Junhao He <hejunhao3@huawei.com> --- drivers/hwtracing/ptt/hisi_ptt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c index 1c8113215885..773acbb54099 100644 --- a/drivers/hwtracing/ptt/hisi_ptt.c +++ b/drivers/hwtracing/ptt/hisi_ptt.c @@ -1215,7 +1215,7 @@ static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt) hisi_ptt->hisi_ptt_pmu = (struct pmu) { .module = THIS_MODULE, - .capabilities = PERF_PMU_CAP_NO_EXCLUDE, + .capabilities = PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_EXCLUSIVE, .task_ctx_nr = perf_sw_context, .attr_groups = hisi_ptt_pmu_groups, .event_init = hisi_ptt_pmu_event_init, -- 2.33.0
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