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A dynamic remove/add storage adapter test hits EEH on PowerPC: EEH: [c00000000004f77c] __eeh_send_failure_event+0x7c/0x160 EEH: [c000000000048464] eeh_dev_check_failure.part.0+0x254/0x660 EEH: [c000000000934e0c] __pci_read_msi_msg+0x1ac/0x280 EEH: [c000000000100f68] pseries_msi_compose_msg+0x28/0x40 EEH: [c00000000020e1cc] irq_chip_compose_msi_msg+0x5c/0x90 EEH: [c000000000214b1c] msi_domain_set_affinity+0xbc/0x100 EEH: [c000000000206be4] irq_do_set_affinity+0x214/0x2c0 EEH: [c000000000206e04] irq_set_affinity_locked+0x174/0x230 EEH: [c000000000207044] irq_set_affinity+0x64/0xa0 EEH: [c000000000212890] write_irq_affinity.constprop.0.isra.0+0x130/0x150 EEH: [c00000000068868c] proc_reg_write+0xfc/0x160 EEH: [c0000000005adb48] vfs_write+0xf8/0x4e0 EEH: [c0000000005ae234] ksys_write+0x84/0x140 EEH: [c00000000002e994] system_call_exception+0x164/0x310 EEH: [c00000000000bfe8] system_call_vectored_common+0xe8/0x278 The irqbalance daemon kicks in before invoking qla2xxx->slot_reset during the EEH recovery process. irqbalance daemon ->irq_set_affinity() ->msi_domain_set_affinity() ->irq_chip_set_affiinity_parent() ->xive_irq_set_affinity() ->pseries_msi_compose_ms() ->__pci_read_msi_msg() ->irq_chip_compose_msi_msg() In __pci_read_msi_msg(), the first MSI-X vector is set to all F by the irqbalance daemon. pci_write_msg_msix: index=0, lo=ffffffff hi=fffffff IRQ balancing is not required during adapter reset. Enable "IRQ_NO_BALANCING" bit before starting adapter reset and disable it calling pci_restore_state(). The irqbalance daemon is disabled for this short period of time (~2s). Co-developed-by: Kyle Mahlkuch <Kyle.Mahlkuch@ibm.com> Signed-off-by: Kyle Mahlkuch <Kyle.Mahlkuch@ibm.com> Signed-off-by: Wen Xiong <wenxiong@linux.ibm.com> Link: https://patch.msgid.link/20251028142427.3969819-3-wenxiong@linux.ibm.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| README | ||
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 reStructuredText 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.