https://github.com/torvalds/linux
Revision 35bf49e054214a0c7d3b0a0f8606f753f3f6ae96 authored by Lu Baolu on 23 August 2022, 06:15:57 UTC, committed by Joerg Roedel on 07 September 2022, 13:14:57 UTC
With CONFIG_INTEL_IOMMU_DEBUGFS enabled, below lockdep splat are seen when an I/O fault occurs on a machine with an Intel IOMMU in it. DMAR: DRHD: handling fault status reg 3 DMAR: [DMA Write NO_PASID] Request device [00:1a.0] fault addr 0x0 [fault reason 0x05] PTE Write access is not set DMAR: Dump dmar0 table entries for IOVA 0x0 DMAR: root entry: 0x0000000127f42001 DMAR: context entry: hi 0x0000000000001502, low 0x000000012d8ab001 ================================ WARNING: inconsistent lock state 5.20.0-0.rc0.20220812git7ebfc85e2cd7.10.fc38.x86_64 #1 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. rngd/1006 [HC1[1]:SC0[0]:HE0:SE1] takes: ff177021416f2d78 (&k->k_lock){?.+.}-{2:2}, at: klist_next+0x1b/0x160 {HARDIRQ-ON-W} state was registered at: lock_acquire+0xce/0x2d0 _raw_spin_lock+0x33/0x80 klist_add_tail+0x46/0x80 bus_add_device+0xee/0x150 device_add+0x39d/0x9a0 add_memory_block+0x108/0x1d0 memory_dev_init+0xe1/0x117 driver_init+0x43/0x4d kernel_init_freeable+0x1c2/0x2cc kernel_init+0x16/0x140 ret_from_fork+0x1f/0x30 irq event stamp: 7812 hardirqs last enabled at (7811): [<ffffffff85000e86>] asm_sysvec_apic_timer_interrupt+0x16/0x20 hardirqs last disabled at (7812): [<ffffffff84f16894>] irqentry_enter+0x54/0x60 softirqs last enabled at (7794): [<ffffffff840ff669>] __irq_exit_rcu+0xf9/0x170 softirqs last disabled at (7787): [<ffffffff840ff669>] __irq_exit_rcu+0xf9/0x170 The klist iterator functions using spin_*lock_irq*() but the klist insertion functions using spin_*lock(), combined with the Intel DMAR IOMMU driver iterating over klists from atomic (hardirq) context, where pci_get_domain_bus_and_slot() calls into bus_find_device() which iterates over klists. As currently there's no plan to fix the klist to make it safe to use in atomic context, this fixes the lockdep splat by avoid calling pci_get_domain_bus_and_slot() in the hardirq context. Fixes: 8ac0b64b9735 ("iommu/vt-d: Use pci_get_domain_bus_and_slot() in pgtable_walk()") Reported-by: Lennert Buytenhek <buytenh@wantstofly.org> Link: https://lore.kernel.org/linux-iommu/Yvo2dfpEh%2FWC+Wrr@wantstofly.org/ Link: https://lore.kernel.org/linux-iommu/YvyBdPwrTuHHbn5X@wantstofly.org/ Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20220819015949.4795-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
1 parent a349ffc
Tip revision: 35bf49e054214a0c7d3b0a0f8606f753f3f6ae96 authored by Lu Baolu on 23 August 2022, 06:15:57 UTC
iommu/vt-d: Fix lockdep splat due to klist iteration in atomic context
iommu/vt-d: Fix lockdep splat due to klist iteration in atomic context
Tip revision: 35bf49e
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- 'perf_evlist__for_each_entry_safe'
- 'perf_evlist__for_each_evsel'
- 'perf_evlist__for_each_mmap'
- 'perf_hpp_list__for_each_format'
- 'perf_hpp_list__for_each_format_safe'
- 'perf_hpp_list__for_each_sort_list'
- 'perf_hpp_list__for_each_sort_list_safe'
- 'perf_pmu__for_each_hybrid_pmu'
- 'ping_portaddr_for_each_entry'
- 'plist_for_each'
- 'plist_for_each_continue'
- 'plist_for_each_entry'
- 'plist_for_each_entry_continue'
- 'plist_for_each_entry_safe'
- 'plist_for_each_safe'
- 'pnp_for_each_card'
- 'pnp_for_each_dev'
- 'protocol_for_each_card'
- 'protocol_for_each_dev'
- 'queue_for_each_hw_ctx'
- 'radix_tree_for_each_slot'
- 'radix_tree_for_each_tagged'
- 'rb_for_each'
- 'rbtree_postorder_for_each_entry_safe'
- 'rdma_for_each_block'
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- 'rdma_umem_for_each_dma_block'
- 'resort_rb__for_each_entry'
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- 'resource_list_for_each_entry_safe'
- 'rhl_for_each_entry_rcu'
- 'rhl_for_each_rcu'
- 'rht_for_each'
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- 'rht_for_each_entry_from'
- 'rht_for_each_entry_rcu'
- 'rht_for_each_entry_rcu_from'
- 'rht_for_each_entry_safe'
- 'rht_for_each_from'
- 'rht_for_each_rcu'
- 'rht_for_each_rcu_from'
- 'rq_for_each_bvec'
- 'rq_for_each_segment'
- 'rq_list_for_each'
- 'rq_list_for_each_safe'
- 'scsi_for_each_prot_sg'
- 'scsi_for_each_sg'
- 'sctp_for_each_hentry'
- 'sctp_skb_for_each'
- 'sec_for_each_insn'
- 'sec_for_each_insn_continue'
- 'sec_for_each_insn_from'
- 'shdma_for_each_chan'
- 'shost_for_each_device'
- 'sk_for_each'
- 'sk_for_each_bound'
- 'sk_for_each_entry_offset_rcu'
- 'sk_for_each_from'
- 'sk_for_each_rcu'
- 'sk_for_each_safe'
- 'sk_nulls_for_each'
- 'sk_nulls_for_each_from'
- 'sk_nulls_for_each_rcu'
- 'snd_array_for_each'
- 'snd_pcm_group_for_each_entry'
- 'snd_soc_dapm_widget_for_each_path'
- 'snd_soc_dapm_widget_for_each_path_safe'
- 'snd_soc_dapm_widget_for_each_sink_path'
- 'snd_soc_dapm_widget_for_each_source_path'
- 'strlist__for_each_entry'
- 'strlist__for_each_entry_safe'
- 'sym_for_each_insn'
- 'sym_for_each_insn_continue_reverse'
- 'symbols__for_each_entry'
- 'tb_property_for_each'
- 'tcf_act_for_each_action'
- 'tcf_exts_for_each_action'
- 'udp_portaddr_for_each_entry'
- 'udp_portaddr_for_each_entry_rcu'
- 'usb_hub_for_each_child'
- 'v4l2_device_for_each_subdev'
- 'v4l2_m2m_for_each_dst_buf'
- 'v4l2_m2m_for_each_dst_buf_safe'
- 'v4l2_m2m_for_each_src_buf'
- 'v4l2_m2m_for_each_src_buf_safe'
- 'virtio_device_for_each_vq'
- 'while_for_each_ftrace_op'
- 'xa_for_each'
- 'xa_for_each_marked'
- 'xa_for_each_range'
- 'xa_for_each_start'
- 'xas_for_each'
- 'xas_for_each_conflict'
- 'xas_for_each_marked'
- 'xbc_array_for_each_value'
- 'xbc_for_each_key_value'
- 'xbc_node_for_each_array_value'
- 'xbc_node_for_each_child'
- 'xbc_node_for_each_key_value'
- 'xbc_node_for_each_subkey'
- 'zorro_for_each_dev'
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