[PATCH v2 3/4] coresight: etm4x: Don't trace PID for non-root PID namespace
kernel test robot
lkp at intel.com
Mon Dec 13 13:45:08 PST 2021
Hi Leo,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.16-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Leo-Yan/coresight-etm-Correct-PID-tracing-for-non-root-namespace/20211213-201632
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2585cf9dfaaddf00b069673f27bb3f8530e2039c
config: arm64-randconfig-r034-20211213 (https://download.01.org/0day-ci/archive/20211214/202112140527.RSkgSFCc-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://github.com/0day-ci/linux/commit/dd716cd12b2f0e47fcc2b0e3e9172e4e70ad4877
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Leo-Yan/coresight-etm-Correct-PID-tracing-for-non-root-namespace/20211213-201632
git checkout dd716cd12b2f0e47fcc2b0e3e9172e4e70ad4877
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/hwtracing/coresight/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>
All errors (new ones prefixed by >>):
>> drivers/hwtracing/coresight/coresight-etm4x-core.c:661:6: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
task_is_in_init_pid_ns(current))
^
1 error generated.
vim +/task_is_in_init_pid_ns +661 drivers/hwtracing/coresight/coresight-etm4x-core.c
606
607 static int etm4_parse_event_config(struct coresight_device *csdev,
608 struct perf_event *event)
609 {
610 int ret = 0;
611 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
612 struct etmv4_config *config = &drvdata->config;
613 struct perf_event_attr *attr = &event->attr;
614 unsigned long cfg_hash;
615 int preset;
616
617 /* Clear configuration from previous run */
618 memset(config, 0, sizeof(struct etmv4_config));
619
620 if (attr->exclude_kernel)
621 config->mode = ETM_MODE_EXCL_KERN;
622
623 if (attr->exclude_user)
624 config->mode = ETM_MODE_EXCL_USER;
625
626 /* Always start from the default config */
627 etm4_set_default_config(config);
628
629 /* Configure filters specified on the perf cmd line, if any. */
630 ret = etm4_set_event_filters(drvdata, event);
631 if (ret)
632 goto out;
633
634 /* Go from generic option to ETMv4 specifics */
635 if (attr->config & BIT(ETM_OPT_CYCACC)) {
636 config->cfg |= BIT(4);
637 /* TRM: Must program this for cycacc to work */
638 config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT;
639 }
640 if (attr->config & BIT(ETM_OPT_TS)) {
641 /*
642 * Configure timestamps to be emitted at regular intervals in
643 * order to correlate instructions executed on different CPUs
644 * (CPU-wide trace scenarios).
645 */
646 ret = etm4_config_timestamp_event(drvdata);
647
648 /*
649 * No need to go further if timestamp intervals can't
650 * be configured.
651 */
652 if (ret)
653 goto out;
654
655 /* bit[11], Global timestamp tracing bit */
656 config->cfg |= BIT(11);
657 }
658
659 /* Only trace contextID when runs in root PID namespace */
660 if ((attr->config & BIT(ETM_OPT_CTXTID)) &&
> 661 task_is_in_init_pid_ns(current))
662 /* bit[6], Context ID tracing bit */
663 config->cfg |= BIT(ETM4_CFG_BIT_CTXTID);
664
665 /*
666 * If set bit ETM_OPT_CTXTID2 in perf config, this asks to trace VMID
667 * for recording CONTEXTIDR_EL2. Do not enable VMID tracing if the
668 * kernel is not running in EL2.
669 */
670 if (attr->config & BIT(ETM_OPT_CTXTID2)) {
671 if (!is_kernel_in_hyp_mode()) {
672 ret = -EINVAL;
673 goto out;
674 }
675
676 /* Only trace virtual contextID when runs in root PID namespace */
677 if (task_is_in_init_pid_ns(current))
678 config->cfg |= BIT(ETM4_CFG_BIT_VMID) |
679 BIT(ETM4_CFG_BIT_VMID_OPT);
680 }
681
682 /* return stack - enable if selected and supported */
683 if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack)
684 /* bit[12], Return stack enable bit */
685 config->cfg |= BIT(12);
686
687 /*
688 * Set any selected configuration and preset.
689 *
690 * This extracts the values of PMU_FORMAT_ATTR(configid) and PMU_FORMAT_ATTR(preset)
691 * in the perf attributes defined in coresight-etm-perf.c.
692 * configid uses bits 63:32 of attr->config2, preset uses bits 3:0 of attr->config.
693 * A zero configid means no configuration active, preset = 0 means no preset selected.
694 */
695 if (attr->config2 & GENMASK_ULL(63, 32)) {
696 cfg_hash = (u32)(attr->config2 >> 32);
697 preset = attr->config & 0xF;
698 ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset);
699 }
700
701 out:
702 return ret;
703 }
704
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
More information about the linux-arm-kernel
mailing list