/* * intel_pt.h: Intel Processor Trace support * Copyright (c) 2013-2015, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * */ #ifndef INCLUDE__PERF_INTEL_PT_H__ #define INCLUDE__PERF_INTEL_PT_H__ #define INTEL_PT_PMU_NAME "intel_pt" enum { INTEL_PT_PMU_TYPE, INTEL_PT_TIME_SHIFT, INTEL_PT_TIME_MULT, INTEL_PT_TIME_ZERO, INTEL_PT_CAP_USER_TIME_ZERO, INTEL_PT_TSC_BIT, INTEL_PT_NORETCOMP_BIT, INTEL_PT_HAVE_SCHED_SWITCH, INTEL_PT_SNAPSHOT_MODE, INTEL_PT_PER_CPU_MMAPS, INTEL_PT_MTC_BIT, INTEL_PT_MTC_FREQ_BITS, INTEL_PT_TSC_CTC_N, INTEL_PT_TSC_CTC_D, INTEL_PT_CYC_BIT, INTEL_PT_MAX_NONTURBO_RATIO, INTEL_PT_FILTER_STR_LEN, INTEL_PT_AUXTRACE_PRIV_MAX, }; struct auxtrace_record; struct perf_tool; union perf_event; struct perf_session; struct perf_event_attr; struct perf_pmu; struct auxtrace_record *intel_pt_recording_init(int *err); int intel_pt_process_auxtrace_info(union perf_event *event, struct perf_session *session); struct perf_event_attr *intel_pt_pmu_default_config(struct perf_pmu *pmu); #endif right'>Tobias Klauser
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/phonet/af_phonet.c
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/phonet/af_phonet.c')