| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * TPH (TLP Processing Hints) |
| * |
| * Copyright (C) 2024 Advanced Micro Devices, Inc. |
| * Eric Van Tassell <[email protected]> |
| * Wei Huang <[email protected]> |
| */ |
| #ifndef LINUX_PCI_TPH_H |
| #define LINUX_PCI_TPH_H |
| |
| /* |
| * According to the ECN for PCI Firmware Spec, Steering Tag can be different |
| * depending on the memory type: Volatile Memory or Persistent Memory. When a |
| * caller query about a target's Steering Tag, it must provide the target's |
| * tph_mem_type. ECN link: https://members.pcisig.com/wg/PCI-SIG/document/15470. |
| */ |
| enum tph_mem_type { |
| TPH_MEM_TYPE_VM, /* volatile memory */ |
| TPH_MEM_TYPE_PM /* persistent memory */ |
| }; |
| |
| #ifdef CONFIG_PCIE_TPH |
| int pcie_tph_set_st_entry(struct pci_dev *pdev, |
| unsigned int index, u16 tag); |
| int pcie_tph_get_cpu_st(struct pci_dev *dev, |
| enum tph_mem_type mem_type, |
| unsigned int cpu_uid, u16 *tag); |
| void pcie_disable_tph(struct pci_dev *pdev); |
| int pcie_enable_tph(struct pci_dev *pdev, int mode); |
| #else |
| static inline int pcie_tph_set_st_entry(struct pci_dev *pdev, |
| unsigned int index, u16 tag) |
| { return -EINVAL; } |
| static inline int pcie_tph_get_cpu_st(struct pci_dev *dev, |
| enum tph_mem_type mem_type, |
| unsigned int cpu_uid, u16 *tag) |
| { return -EINVAL; } |
| static inline void pcie_disable_tph(struct pci_dev *pdev) { } |
| static inline int pcie_enable_tph(struct pci_dev *pdev, int mode) |
| { return -EINVAL; } |
| #endif |
| |
| #endif /* LINUX_PCI_TPH_H */ |
