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| author | Bjorn Helgaas <bhelgaas@google.com> | 2024-11-25 22:40:55 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-11-25 22:40:55 +0300 |
| commit | ab02bafcecedcd936d9e8526bcf1542642ad2947 (patch) | |
| tree | 9c57b82784dac878302ed43a8293b5b55d2dd75d /include/linux | |
| parent | efcbd9d3975f03c600f42a018f2453f2957042ad (diff) | |
| parent | 48d0fd2b903e397c2a9621ab35f3d8877f61aee4 (diff) | |
| download | linux-ab02bafcecedcd936d9e8526bcf1542642ad2947.tar.xz | |
Merge branch 'pci/tph'
- Add and document TLP Processing Hints (TPH) support so drivers can enable
and disable TPH and the kernel can save/restore TPH configuration (Wei
Huang)
- Add TPH Steering Tag support so drivers can retrieve Steering Tag values
associated with specific CPUs via an ACPI _DSM to direct DMA writes
closer to their consumers (Wei Huang)
* pci/tph:
PCI/TPH: Add TPH documentation
PCI/TPH: Add Steering Tag support
PCI: Add TLP Processing Hints (TPH) support
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pci-tph.h | 44 | ||||
| -rw-r--r-- | include/linux/pci.h | 7 |
2 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/pci-tph.h b/include/linux/pci-tph.h new file mode 100644 index 000000000000..c3e806c13d64 --- /dev/null +++ b/include/linux/pci-tph.h @@ -0,0 +1,44 @@ +/* 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 */ diff --git a/include/linux/pci.h b/include/linux/pci.h index 5db9b0b2dca1..19147cb5bd9d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -442,6 +442,7 @@ struct pci_dev { unsigned int ats_enabled:1; /* Address Translation Svc */ unsigned int pasid_enabled:1; /* Process Address Space ID */ unsigned int pri_enabled:1; /* Page Request Interface */ + unsigned int tph_enabled:1; /* TLP Processing Hints */ unsigned int is_managed:1; /* Managed via devres */ unsigned int is_msi_managed:1; /* MSI release via devres installed */ unsigned int needs_freset:1; /* Requires fundamental reset */ @@ -544,6 +545,12 @@ struct pci_dev { /* These methods index pci_reset_fn_methods[] */ u8 reset_methods[PCI_NUM_RESET_METHODS]; /* In priority order */ + +#ifdef CONFIG_PCIE_TPH + u16 tph_cap; /* TPH capability offset */ + u8 tph_mode; /* TPH mode */ + u8 tph_req_type; /* TPH requester type */ +#endif }; static inline struct pci_dev *pci_physfn(struct pci_dev *dev) |