How to use Power Management capability to reset PCI device function

本文将结合spec与kernel代码来介绍：利用Power Management capability to reset PCI device function。

Background

PCIe设备的PM状态:

Details

核心思想: Put device into D3 state and back into D0 state.

• 检查PMCSR的No_Soft_Reset bit

• Put device into D3 state

• Put device back into D0 state

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参考资料:

1. PCIe扫盲——Power Management概述
2. PCI Bus Power Management Interface Specification Revision 1.2
3. pci_pm_reset
4. RFC: PCI Power Management Documentation