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9f728f53dd
Need to use it in _e1000e_disable_aspm. This routine is used for error
recovery, where the pci_bus_sem is already held, and we don't want
pci_disable_link_state to try to take it again. So add a locked variant
for use in cases like this.
Found lock up:
[ 2374.654557] kworker/32:1 D ffff881027f6b0f0 0 6075 2 0x00000000
[ 2374.654816] ffff88503f099a68 0000000000000046 ffff88503f098000 0000000000004000
[ 2374.654837] 00000000001d1ec0 ffff88503f099fd8 00000000001d1ec0 ffff88503f099fd8
[ 2374.654860] 0000000000004000 00000000001d1ec0 ffff88503dcc8000 ffff88503f090000
[ 2374.654880] Call Trace:
[ 2374.654898] [<ffffffff810b1302>] ? __lock_acquired+0x3a/0x224
[ 2374.654914] [<ffffffff81c2b59c>] ? _raw_spin_unlock_irq+0x30/0x36
[ 2374.654925] [<ffffffff810b069d>] ? trace_hardirqs_on_caller+0x1f/0x178
[ 2374.654936] [<ffffffff81c2ab24>] rwsem_down_failed_common+0xd3/0x103
[ 2374.654945] [<ffffffff810b158f>] ? __lock_contended+0x3a/0x2a2
[ 2374.654955] [<ffffffff81c2ab7b>] rwsem_down_read_failed+0x12/0x14
[ 2374.654967] [<ffffffff813371e4>] call_rwsem_down_read_failed+0x14/0x30
[ 2374.654981] [<ffffffff8135df20>] ? pci_disable_link_state+0x5f/0xf5
[ 2374.654990] [<ffffffff81c2a0e6>] ? down_read+0x7e/0x91
[ 2374.654999] [<ffffffff8135df20>] ? pci_disable_link_state+0x5f/0xf5
[ 2374.655008] [<ffffffff8135df20>] pci_disable_link_state+0x5f/0xf5
[ 2374.655024] [<ffffffff81661796>] e1000e_disable_aspm+0x55/0x5a
[ 2374.655037] [<ffffffff816677eb>] e1000_io_slot_reset+0x59/0xea
[ 2374.655048] [<ffffffff8135fe0d>] ? report_mmio_enabled+0x5d/0x5d
[ 2374.655057] [<ffffffff8135fe3b>] report_slot_reset+0x2e/0x5d
[ 2374.655072] [<ffffffff8135369e>] pci_walk_bus+0x8a/0xb7
[ 2374.655081] [<ffffffff8135fe0d>] ? report_mmio_enabled+0x5d/0x5d
[ 2374.655091] [<ffffffff813603be>] broadcast_error_message+0xa4/0xb2
[ 2374.655101] [<ffffffff81352c71>] ? pci_bus_read_config_dword+0x72/0x80
[ 2374.655110] [<ffffffff813606df>] do_recovery+0x9e/0xf9
[ 2374.655120] [<ffffffff81360786>] handle_error_source+0x4c/0x51
[ 2374.655129] [<ffffffff81360974>] aer_isr_one_error+0x1e9/0x21a
[ 2374.655138] [<ffffffff81360a6c>] aer_isr+0xc7/0xcc
[ 2374.655147] [<ffffffff813609a5>] ? aer_isr_one_error+0x21a/0x21a
[ 2374.655159] [<ffffffff81096d9f>] process_one_work+0x237/0x3ec
[ 2374.655168] [<ffffffff81096d10>] ? process_one_work+0x1a8/0x3ec
[ 2374.655178] [<ffffffff8109728d>] worker_thread+0x17c/0x240
[ 2374.655186] [<ffffffff810b0803>] ? trace_hardirqs_on+0xd/0xf
[ 2374.655196] [<ffffffff81097111>] ? manage_workers+0xab/0xab
[ 2374.655209] [<ffffffff8109c8ed>] kthread+0xa0/0xa8
[ 2374.655223] [<ffffffff81c332d4>] kernel_thread_helper+0x4/0x10
[ 2374.655232] [<ffffffff81c2b880>] ? retint_restore_args+0xe/0xe
[ 2374.655243] [<ffffffff8109c84d>] ? __init_kthread_worker+0x5b/0x5b
[ 2374.655252] [<ffffffff81c332d0>] ? gs_change+0xb/0xb
when aer happens,
pci_walk_bus already have down_read(&pci_bus_sem)...
then report_slot_reset
==> e1000_io_slot_reset
==> e1000e_disable_aspm
==> pci_disable_link_state...
We can not use pci_disable_link_state, and it will try to hold pci_bus_sem again.
Try to have __pci_disable_link_state that will not need to hold pci_bus_sem.
-v2: change name to pci_disable_link_state_locked() according to Jesse.
[jbarnes: make sure new function is exported for modules]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* aspm.h
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*
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* PCI Express ASPM defines and function prototypes
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*
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* Copyright (C) 2007 Intel Corp.
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* Zhang Yanmin (yanmin.zhang@intel.com)
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* Shaohua Li (shaohua.li@intel.com)
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*
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* For more information, please consult the following manuals (look at
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* http://www.pcisig.com/ for how to get them):
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*
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* PCI Express Specification
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*/
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#ifndef LINUX_ASPM_H
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#define LINUX_ASPM_H
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#include <linux/pci.h>
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#define PCIE_LINK_STATE_L0S 1
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#define PCIE_LINK_STATE_L1 2
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#define PCIE_LINK_STATE_CLKPM 4
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#ifdef CONFIG_PCIEASPM
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extern void pcie_aspm_init_link_state(struct pci_dev *pdev);
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extern void pcie_aspm_exit_link_state(struct pci_dev *pdev);
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extern void pcie_aspm_pm_state_change(struct pci_dev *pdev);
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extern void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
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extern void pci_disable_link_state(struct pci_dev *pdev, int state);
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extern void pci_disable_link_state_locked(struct pci_dev *pdev, int state);
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extern void pcie_clear_aspm(void);
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extern void pcie_no_aspm(void);
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#else
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static inline void pcie_aspm_init_link_state(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev)
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{
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}
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static inline void pci_disable_link_state(struct pci_dev *pdev, int state)
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{
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}
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static inline void pcie_clear_aspm(void)
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{
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}
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static inline void pcie_no_aspm(void)
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{
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}
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#endif
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#ifdef CONFIG_PCIEASPM_DEBUG /* this depends on CONFIG_PCIEASPM */
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extern void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev);
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extern void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev);
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#else
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static inline void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
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{
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}
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#endif
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#endif /* LINUX_ASPM_H */
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