| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * TPH (TLP Processing Hints) | |
| * | |
| * Copyright (C) 2024 Advanced Micro Devices, Inc. | |
| * Eric Van Tassell <Eric.VanTassell@amd.com> | |
| * Wei Huang <wei.huang2@amd.com> | |
| */ | |
| #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); | |
| u16 pcie_tph_get_st_table_size(struct pci_dev *pdev); | |
| #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 */ |