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/* 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);
#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 */
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