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Merge branch 'pci/tph'

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- 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
This commit is contained in:
Bjorn Helgaas
2024-11-25 13:40:55 -06:00
parent efcbd9d397 48d0fd2b90
commit ab02bafcec
13 changed files with 794 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/uapi/linux/pci_regs.h
+29 -8
View File
@@ -340,7 +340,8 @@
#define PCI_MSIX_ENTRY_UPPER_ADDR 0x4 /* Message Upper Address */
#define PCI_MSIX_ENTRY_DATA 0x8 /* Message Data */
#define PCI_MSIX_ENTRY_VECTOR_CTRL 0xc /* Vector Control */
#define PCI_MSIX_ENTRY_CTRL_MASKBIT 0x00000001
#define PCI_MSIX_ENTRY_CTRL_MASKBIT 0x00000001 /* Mask Bit */
#define PCI_MSIX_ENTRY_CTRL_ST 0xffff0000 /* Steering Tag */
/* CompactPCI Hotswap Register */
@@ -659,6 +660,7 @@
#define PCI_EXP_DEVCAP2_ATOMIC_COMP64 0x00000100 /* 64b AtomicOp completion */
#define PCI_EXP_DEVCAP2_ATOMIC_COMP128 0x00000200 /* 128b AtomicOp completion */
#define PCI_EXP_DEVCAP2_LTR 0x00000800 /* Latency tolerance reporting */
#define PCI_EXP_DEVCAP2_TPH_COMP_MASK 0x00003000 /* TPH completer support */
#define PCI_EXP_DEVCAP2_OBFF_MASK 0x000c0000 /* OBFF support mechanism */
#define PCI_EXP_DEVCAP2_OBFF_MSG 0x00040000 /* New message signaling */
#define PCI_EXP_DEVCAP2_OBFF_WAKE 0x00080000 /* Re-use WAKE# for OBFF */
@@ -1024,15 +1026,34 @@
#define PCI_DPA_CAP_SUBSTATE_MASK 0x1F /* # substates - 1 */
#define PCI_DPA_BASE_SIZEOF 16 /* size with 0 substates */
/* TPH Completer Support */
#define PCI_EXP_DEVCAP2_TPH_COMP_NONE 0x0 /* None */
#define PCI_EXP_DEVCAP2_TPH_COMP_TPH_ONLY 0x1 /* TPH only */
#define PCI_EXP_DEVCAP2_TPH_COMP_EXT_TPH 0x3 /* TPH and Extended TPH */
/* TPH Requester */
#define PCI_TPH_CAP 4 /* capability register */
#define PCI_TPH_CAP_LOC_MASK 0x600 /* location mask */
#define PCI_TPH_LOC_NONE 0x000 /* no location */
#define PCI_TPH_LOC_CAP 0x200 /* in capability */
#define PCI_TPH_LOC_MSIX 0x400 /* in MSI-X */
#define PCI_TPH_CAP_ST_MASK 0x07FF0000 /* ST table mask */
#define PCI_TPH_CAP_ST_SHIFT 16 /* ST table shift */
#define PCI_TPH_BASE_SIZEOF 0xc /* size with no ST table */
#define PCI_TPH_CAP_ST_NS 0x00000001 /* No ST Mode Supported */
#define PCI_TPH_CAP_ST_IV 0x00000002 /* Interrupt Vector Mode Supported */
#define PCI_TPH_CAP_ST_DS 0x00000004 /* Device Specific Mode Supported */
#define PCI_TPH_CAP_EXT_TPH 0x00000100 /* Ext TPH Requester Supported */
#define PCI_TPH_CAP_LOC_MASK 0x00000600 /* ST Table Location */
#define PCI_TPH_LOC_NONE 0x00000000 /* Not present */
#define PCI_TPH_LOC_CAP 0x00000200 /* In capability */
#define PCI_TPH_LOC_MSIX 0x00000400 /* In MSI-X */
#define PCI_TPH_CAP_ST_MASK 0x07FF0000 /* ST Table Size */
#define PCI_TPH_CAP_ST_SHIFT 16 /* ST Table Size shift */
#define PCI_TPH_BASE_SIZEOF 0xc /* Size with no ST table */
#define PCI_TPH_CTRL 8 /* control register */
#define PCI_TPH_CTRL_MODE_SEL_MASK 0x00000007 /* ST Mode Select */
#define PCI_TPH_ST_NS_MODE 0x0 /* No ST Mode */
#define PCI_TPH_ST_IV_MODE 0x1 /* Interrupt Vector Mode */
#define PCI_TPH_ST_DS_MODE 0x2 /* Device Specific Mode */
#define PCI_TPH_CTRL_REQ_EN_MASK 0x00000300 /* TPH Requester Enable */
#define PCI_TPH_REQ_DISABLE 0x0 /* No TPH requests allowed */
#define PCI_TPH_REQ_TPH_ONLY 0x1 /* TPH only requests allowed */
#define PCI_TPH_REQ_EXT_TPH 0x3 /* Extended TPH requests allowed */
/* Downstream Port Containment */
#define PCI_EXP_DPC_CAP 0x04 /* DPC Capability */