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 <Eric.VanTassell@amd.com>
7 * Wei Huang <wei.huang2@amd.com>
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 u16 pcie_tph_get_st_table_size(struct pci_dev *pdev);
32 u32 pcie_tph_get_st_table_loc(struct pci_dev *pdev);
33 #else
pcie_tph_set_st_entry(struct pci_dev * pdev,unsigned int index,u16 tag)34 static inline int pcie_tph_set_st_entry(struct pci_dev *pdev,
35 unsigned int index, u16 tag)
36 { return -EINVAL; }
pcie_tph_get_cpu_st(struct pci_dev * dev,enum tph_mem_type mem_type,unsigned int cpu_uid,u16 * tag)37 static inline int pcie_tph_get_cpu_st(struct pci_dev *dev,
38 enum tph_mem_type mem_type,
39 unsigned int cpu_uid, u16 *tag)
40 { return -EINVAL; }
pcie_disable_tph(struct pci_dev * pdev)41 static inline void pcie_disable_tph(struct pci_dev *pdev) { }
pcie_enable_tph(struct pci_dev * pdev,int mode)42 static inline int pcie_enable_tph(struct pci_dev *pdev, int mode)
43 { return -EINVAL; }
44 #endif
45
46 #endif /* LINUX_PCI_TPH_H */
47