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Triggering PPC EEH detection and handling requires a memory mapped read failure. The NVMe driver removed the periodic health check MMIO, so there's no early detection mechanism to trigger the recovery. Instead, the detection now happens when the nvme driver handles an IO timeout event. This takes the pci channel offline, so we do not want the driver to proceed with escalating its own recovery efforts that may conflict with the EEH handler. This patch ensures the driver will observe the channel was set to offline after a failed MMIO read and resets the IO timer so the EEH handler has a chance to recover the device. Signed-off-by: Wen Xiong <wenxiong@linux.vnet.ibm.com> [updated change log] Signed-off-by: Keith Busch <keith.busch@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.