forked from mirrors/linux
d2e8a34876
Add pcie_tph_get_cpu_st() to allow a caller to retrieve Steering Tags for a target memory associated with a specific CPU. The ST tag is retrieved by invoking PCI ACPI "_DSM to Query Cache Locality TPH Features" method (rev=0x7, func=0xF) of the device's Root Port device. Add pcie_tph_set_st_entry() to update the device's Steering Tags. The tags will be written into the device's MSI-X table or the ST table located in the TPH Extended Capability space. Co-developed-by: Eric Van Tassell <Eric.VanTassell@amd.com> Link: https://lore.kernel.org/r/20241002165954.128085-3-wei.huang2@amd.com Signed-off-by: Eric Van Tassell <Eric.VanTassell@amd.com> Signed-off-by: Wei Huang <wei.huang2@amd.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com> Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com> Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* TPH (TLP Processing Hints)
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*
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* Copyright (C) 2024 Advanced Micro Devices, Inc.
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* Eric Van Tassell <Eric.VanTassell@amd.com>
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* Wei Huang <wei.huang2@amd.com>
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*/
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#ifndef LINUX_PCI_TPH_H
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#define LINUX_PCI_TPH_H
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/*
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* According to the ECN for PCI Firmware Spec, Steering Tag can be different
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* depending on the memory type: Volatile Memory or Persistent Memory. When a
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* caller query about a target's Steering Tag, it must provide the target's
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* tph_mem_type. ECN link: https://members.pcisig.com/wg/PCI-SIG/document/15470.
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*/
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enum tph_mem_type {
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TPH_MEM_TYPE_VM, /* volatile memory */
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TPH_MEM_TYPE_PM /* persistent memory */
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};
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#ifdef CONFIG_PCIE_TPH
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int pcie_tph_set_st_entry(struct pci_dev *pdev,
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unsigned int index, u16 tag);
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int pcie_tph_get_cpu_st(struct pci_dev *dev,
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enum tph_mem_type mem_type,
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unsigned int cpu_uid, u16 *tag);
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void pcie_disable_tph(struct pci_dev *pdev);
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int pcie_enable_tph(struct pci_dev *pdev, int mode);
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#else
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static inline int pcie_tph_set_st_entry(struct pci_dev *pdev,
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unsigned int index, u16 tag)
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{ return -EINVAL; }
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static inline int pcie_tph_get_cpu_st(struct pci_dev *dev,
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enum tph_mem_type mem_type,
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unsigned int cpu_uid, u16 *tag)
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{ return -EINVAL; }
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static inline void pcie_disable_tph(struct pci_dev *pdev) { }
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static inline int pcie_enable_tph(struct pci_dev *pdev, int mode)
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{ return -EINVAL; }
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#endif
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#endif /* LINUX_PCI_TPH_H */
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