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PCI/TPH: Expose pcie_tph_get_st_table_loc() 

Expose pcie_tph_get_st_table_loc() to be used by drivers as will be done
in the next patch from the series.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Edward Srouji <edwards@nvidia.com>
Link: https://patch.msgid.link/20251027-st-direct-mode-v1-1-e0ad953866b6@nvidia.com
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Yishai Hadas 2025-10-27 11:34:01 +02:00 committed by Leon Romanovsky
parent eea31f21dc
commit 7b8a8ec20c
2 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/pci/tph.c
View File

@ -155,7 +155,16 @@ static u8 get_st_modes(struct pci_dev *pdev)
return reg; return reg;
} }
static u32 get_st_table_loc(struct pci_dev *pdev) /**
* pcie_tph_get_st_table_loc - Return the device's ST table location
* @pdev: PCI device to query
*
* Return:
* PCI_TPH_LOC_NONE - Not present
* PCI_TPH_LOC_CAP - Located in the TPH Requester Extended Capability
* PCI_TPH_LOC_MSIX - Located in the MSI-X Table
*/
u32 pcie_tph_get_st_table_loc(struct pci_dev *pdev)
{ {
u32 reg; u32 reg;
@ -163,6 +172,7 @@ static u32 get_st_table_loc(struct pci_dev *pdev)
return FIELD_GET(PCI_TPH_CAP_LOC_MASK, reg); return FIELD_GET(PCI_TPH_CAP_LOC_MASK, reg);
} }
EXPORT_SYMBOL(pcie_tph_get_st_table_loc);
/* /*
* Return the size of ST table. If ST table is not in TPH Requester Extended * Return the size of ST table. If ST table is not in TPH Requester Extended
@ -174,7 +184,7 @@ u16 pcie_tph_get_st_table_size(struct pci_dev *pdev)
u32 loc; u32 loc;
/* Check ST table location first */ /* Check ST table location first */
loc = get_st_table_loc(pdev); loc = pcie_tph_get_st_table_loc(pdev);
/* Convert loc to match with PCI_TPH_LOC_* defined in pci_regs.h */ /* Convert loc to match with PCI_TPH_LOC_* defined in pci_regs.h */
loc = FIELD_PREP(PCI_TPH_CAP_LOC_MASK, loc); loc = FIELD_PREP(PCI_TPH_CAP_LOC_MASK, loc);
@ -299,7 +309,7 @@ int pcie_tph_set_st_entry(struct pci_dev *pdev, unsigned int index, u16 tag)
*/ */
set_ctrl_reg_req_en(pdev, PCI_TPH_REQ_DISABLE); set_ctrl_reg_req_en(pdev, PCI_TPH_REQ_DISABLE);
loc = get_st_table_loc(pdev); loc = pcie_tph_get_st_table_loc(pdev);
/* Convert loc to match with PCI_TPH_LOC_* */ /* Convert loc to match with PCI_TPH_LOC_* */
loc = FIELD_PREP(PCI_TPH_CAP_LOC_MASK, loc); loc = FIELD_PREP(PCI_TPH_CAP_LOC_MASK, loc);

1
include/linux/pci-tph.h
View File

@ -29,6 +29,7 @@ int pcie_tph_get_cpu_st(struct pci_dev *dev,
void pcie_disable_tph(struct pci_dev *pdev); void pcie_disable_tph(struct pci_dev *pdev);
int pcie_enable_tph(struct pci_dev *pdev, int mode); int pcie_enable_tph(struct pci_dev *pdev, int mode);
u16 pcie_tph_get_st_table_size(struct pci_dev *pdev); u16 pcie_tph_get_st_table_size(struct pci_dev *pdev);
u32 pcie_tph_get_st_table_loc(struct pci_dev *pdev);
#else #else
static inline int pcie_tph_set_st_entry(struct pci_dev *pdev, static inline int pcie_tph_set_st_entry(struct pci_dev *pdev,
unsigned int index, u16 tag) unsigned int index, u16 tag)