1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * TPH (TLP Processing Hints) 4 * 5 * Copyright (C) 2024 Advanced Micro Devices, Inc. 6 * Eric Van Tassell <[email protected]> 7 * Wei Huang <[email protected]> 8 */ 9 #ifndef LINUX_PCI_TPH_H 10 #define LINUX_PCI_TPH_H 11 12 /* 13 * According to the ECN for PCI Firmware Spec, Steering Tag can be different 14 * depending on the memory type: Volatile Memory or Persistent Memory. When a 15 * caller query about a target's Steering Tag, it must provide the target's 16 * tph_mem_type. ECN link: https://members.pcisig.com/wg/PCI-SIG/document/15470. 17 */ 18 enum tph_mem_type { 19 TPH_MEM_TYPE_VM, /* volatile memory */ 20 TPH_MEM_TYPE_PM /* persistent memory */ 21 }; 22 23 #ifdef CONFIG_PCIE_TPH 24 int pcie_tph_set_st_entry(struct pci_dev *pdev, 25 unsigned int index, u16 tag); 26 int pcie_tph_get_cpu_st(struct pci_dev *dev, 27 enum tph_mem_type mem_type, 28 unsigned int cpu_uid, u16 *tag); 29 void pcie_disable_tph(struct pci_dev *pdev); 30 int pcie_enable_tph(struct pci_dev *pdev, int mode); 31 #else 32 static inline int pcie_tph_set_st_entry(struct pci_dev *pdev, 33 unsigned int index, u16 tag) 34 { return -EINVAL; } 35 static inline int pcie_tph_get_cpu_st(struct pci_dev *dev, 36 enum tph_mem_type mem_type, 37 unsigned int cpu_uid, u16 *tag) 38 { return -EINVAL; } 39 static inline void pcie_disable_tph(struct pci_dev *pdev) { } 40 static inline int pcie_enable_tph(struct pci_dev *pdev, int mode) 41 { return -EINVAL; } 42 #endif 43 44 #endif /* LINUX_PCI_TPH_H */ 45