From f69767a1ada3ac74be2e1ac0795a05e1d1384eff Mon Sep 17 00:00:00 2001 From: Wei Huang Date: Wed, 2 Oct 2024 11:59:50 -0500 Subject: PCI: Add TLP Processing Hints (TPH) support Add support for PCIe TLP Processing Hints (TPH) support (see PCIe r6.2, sec 6.17). Add TPH register definitions in pci_regs.h, including the TPH Requester capability register, TPH Requester control register, TPH Completer capability, and the ST fields of MSI-X entry. Introduce pcie_enable_tph() and pcie_disable_tph(), enabling drivers to toggle TPH support and configure specific ST mode as needed. Also add a new kernel parameter, "pci=notph", allowing users to disable TPH support across the entire system. Link: https://lore.kernel.org/r/20241002165954.128085-2-wei.huang2@amd.com Co-developed-by: Jing Liu Co-developed-by: Paul Luse Co-developed-by: Eric Van Tassell Signed-off-by: Jing Liu Signed-off-by: Paul Luse Signed-off-by: Eric Van Tassell Signed-off-by: Wei Huang Signed-off-by: Bjorn Helgaas Reviewed-by: Ajit Khaparde Reviewed-by: Somnath Kotur Reviewed-by: Andy Gospodarek Reviewed-by: Jonathan Cameron Reviewed-by: Lukas Wunner --- drivers/pci/pci.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/pci/pci.h') diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 14d00ce45bfa..d89fdbf04f36 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -597,6 +597,18 @@ static inline int pci_iov_bus_range(struct pci_bus *bus) #endif /* CONFIG_PCI_IOV */ +#ifdef CONFIG_PCIE_TPH +void pci_restore_tph_state(struct pci_dev *dev); +void pci_save_tph_state(struct pci_dev *dev); +void pci_no_tph(void); +void pci_tph_init(struct pci_dev *dev); +#else +static inline void pci_restore_tph_state(struct pci_dev *dev) { } +static inline void pci_save_tph_state(struct pci_dev *dev) { } +static inline void pci_no_tph(void) { } +static inline void pci_tph_init(struct pci_dev *dev) { } +#endif + #ifdef CONFIG_PCIE_PTM void pci_ptm_init(struct pci_dev *dev); void pci_save_ptm_state(struct pci_dev *dev); -- cgit v1.2.3