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en:pcie:hot-reset-linux [2019/04/16 23:00] alex |
en:pcie:hot-reset-linux [2019/04/16 23:02] alex |
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| A 'function-level reset' (FLR) is a reset that affects only a single function of a PCI express device. It must not reset the entire PCIe device. Implementing function-level resets is not required by the PCIe specification. A function-level reset is initiated by setting the initiate function-level reset bit in the function's device control register in the PCI express capability structure in the PCI configuration space. | A 'function-level reset' (FLR) is a reset that affects only a single function of a PCI express device. It must not reset the entire PCIe device. Implementing function-level resets is not required by the PCIe specification. A function-level reset is initiated by setting the initiate function-level reset bit in the function's device control register in the PCI express capability structure in the PCI configuration space. | ||
| - | Linux exposes the function-level reset functionality in the form of /sys/bus/pci/devices/$dev/reset. Writing a 1 to this file will initiate a function-level reset on the corresponding function. Note that this only affects that specific function of the device, not the whole device, and devices are not required to implement function-level resets as per the PCIe specification. | + | Linux exposes the function-level reset functionality in the form of ''/sys/bus/pci/devices/$dev/reset''. Writing a 1 to this file will initiate a function-level reset on the corresponding function. Note that this only affects that specific function of the device, not the whole device, and devices are not required to implement function-level resets as per the PCIe specification. |
| I am not aware of any 'nice' method for triggering a hot reset (there is no sysfs entry for that). However, it is possible to use setpci to do so with the following script: | I am not aware of any 'nice' method for triggering a hot reset (there is no sysfs entry for that). However, it is possible to use setpci to do so with the following script: | ||