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387d37577f
Communications with a hardware vendor confirm that the expected behaviour on systems that set the FADT ASPM disable bit but which still grant full PCIe control is for the OS to leave any BIOS configuration intact and refuse to touch the ASPM bits. This mimics the behaviour of Windows. Signed-off-by: Matthew Garrett <mjg59@coreos.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* aspm.h
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*
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* PCI Express ASPM defines and function prototypes
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*
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* Copyright (C) 2007 Intel Corp.
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* Zhang Yanmin (yanmin.zhang@intel.com)
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* Shaohua Li (shaohua.li@intel.com)
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*
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* For more information, please consult the following manuals (look at
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* http://www.pcisig.com/ for how to get them):
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*
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* PCI Express Specification
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*/
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#ifndef LINUX_ASPM_H
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#define LINUX_ASPM_H
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#include <linux/pci.h>
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#define PCIE_LINK_STATE_L0S 1
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#define PCIE_LINK_STATE_L1 2
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#define PCIE_LINK_STATE_CLKPM 4
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#ifdef CONFIG_PCIEASPM
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void pcie_aspm_init_link_state(struct pci_dev *pdev);
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void pcie_aspm_exit_link_state(struct pci_dev *pdev);
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void pcie_aspm_pm_state_change(struct pci_dev *pdev);
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void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
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void pci_disable_link_state(struct pci_dev *pdev, int state);
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void pci_disable_link_state_locked(struct pci_dev *pdev, int state);
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void pcie_no_aspm(void);
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#else
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static inline void pcie_aspm_init_link_state(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev)
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{
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}
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static inline void pci_disable_link_state(struct pci_dev *pdev, int state)
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{
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}
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static inline void pcie_no_aspm(void)
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{
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}
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#endif
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#ifdef CONFIG_PCIEASPM_DEBUG /* this depends on CONFIG_PCIEASPM */
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void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev);
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void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev);
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#else
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static inline void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev)
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{
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}
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static inline void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
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{
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}
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#endif
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#endif /* LINUX_ASPM_H */
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