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AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to avoid unwanted interrupts raised by AFI after pex_rst is asserted. The following sequence triggers such scenario: - tegra_pcie_remove() triggers runtime suspend - pex_rst is asserted in runtime suspend - PRSNT_MAP bit field in RP_PRIV_MISC register changes from EP_PRSNT to EP_ABSNT - This is sensed by AFI and triggers "Slot present pin change" interrupt - tegra_pcie_isr() function accesses AFI register when runtime suspend is going through power off sequence Resulting faulty backtrace: rmmod pci-tegra pci_generic_config_write32: 108 callbacks suppressed pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x4c may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x9c may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x88 may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x90 may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x4 may corrupt adjacent RW1C bits igb 0002:04:00.1: removed PHC on enP2p4s0f1 igb 0002:04:00.0: removed PHC on enP2p4s0f0 pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x4c may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x9c may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x88 may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x90 may corrupt adjacent RW1C bits pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x4 may corrupt adjacent RW1C bits rcu: INFO: rcu_preempt self-detected stall on CPU SError Interrupt on CPU0, code 0xbf000002 -- SError CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.1.0-rc3-next-20190405-00027-gcd8110499e6f-dirty #42 Hardware name: NVIDIA Jetson TX1 Developer Kit (DT) pstate: 20000085 (nzCv daIf -PAN -UAO) pc : tegra_pcie_isr+0x58/0x178 [pci_tegra] lr : tegra_pcie_isr+0x40/0x178 [pci_tegra] sp : ffff000010003da0 x29: ffff000010003da0 x28: 0000000000000000 x27: ffff8000f9e61000 x26: ffff000010fbf420 x25: ffff000011427f93 x24: ffff8000fa600410 x23: ffff00001129d000 x22: ffff00001129d000 x21: ffff8000f18bf3c0 x20: 0000000000000070 x19: 00000000ffffffff x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: ffff000008d40a48 x13: ffff000008d40a30 x12: ffff000008d40a20 x11: ffff000008d40a10 x10: ffff000008d40a00 x9 : ffff000008d409e8 x8 : ffff000008d40ae8 x7 : ffff000008d40ad0 x6 : ffff000010003e58 x5 : ffff8000fac00248 x4 : 0000000000000000 x3 : ffff000008d40b08 x2 : fffffffffffffff8 x1 : ffff000008d3f4e8 x0 : 00000000ffffffff Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.1.0-rc3-next-20190405-00027-gcd8110499e6f-dirty #42 Hardware name: NVIDIA Jetson TX1 Developer Kit (DT) Call trace: dump_backtrace+0x0/0x158 show_stack+0x14/0x20 dump_stack+0xa8/0xcc panic+0x140/0x2f4 nmi_panic+0x6c/0x70 arm64_serror_panic+0x74/0x80 __pte_error+0x0/0x28 el1_error+0x84/0xf8 tegra_pcie_isr+0x58/0x178 [pci_tegra] __handle_irq_event_percpu+0x70/0x198 handle_irq_event_percpu+0x34/0x88 handle_irq_event+0x48/0x78 handle_fasteoi_irq+0xb4/0x190 generic_handle_irq+0x24/0x38 __handle_domain_irq+0x5c/0xb8 gic_handle_irq+0x58/0xa8 el1_irq+0xb8/0x180 cpuidle_enter_state+0x138/0x358 cpuidle_enter+0x18/0x20 call_cpuidle+0x1c/0x48 do_idle+0x230/0x2d0 cpu_startup_entry+0x20/0x28 rest_init+0xd4/0xe0 arch_call_rest_init+0xc/0x14 start_kernel+0x444/0x470 AFI_INTR is re-enabled on resume in tegra_pcie_pm_resume() through tegra_pcie_enable_controller(). Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> [lorenzo.pieralisi@arm.com: updated log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Thierry Reding <treding@nvidia.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.