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ntb_hw_amd: Update amd_ntb_get_link_status to support latest generation secondary topology 

In the NTB secondary topology configuration of the latest generation,
the device behaves like an endpoint. Hence, add endpoint support and
update amd_ntb_get_link_status to accommodate endpoint devices.

Co-developed-by: Sanath S <Sanath.S@amd.com>
Signed-off-by: Sanath S <Sanath.S@amd.com>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Basavaraj Natikar 2025-09-18 13:04:47 +05:30 committed by Jon Mason
parent 8f5ae30d69
commit f0c260f175
2 changed files with 18 additions and 1 deletions
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18
drivers/ntb/hw/amd/ntb_hw_amd.c
View File

@ -197,13 +197,22 @@ static int amd_ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int idx,
static int amd_ntb_get_link_status(struct amd_ntb_dev *ndev)
{
struct pci_dev *pdev = NULL;
struct pci_dev *pdev = ndev->ntb.pdev;
struct pci_dev *pci_swds = NULL;
struct pci_dev *pci_swus = NULL;
u32 stat;
int rc;
if (ndev->ntb.topo == NTB_TOPO_SEC) {
if (ndev->dev_data->is_endpoint) {
rc = pcie_capability_read_dword(pdev, PCI_EXP_LNKCTL, &stat);
if (rc)
return rc;
ndev->lnk_sta = stat;
return 0;
}
/* Locate the pointer to Downstream Switch for this device */
pci_swds = pci_upstream_bridge(ndev->ntb.pdev);
if (pci_swds) {
@ -1311,6 +1320,11 @@ static const struct ntb_dev_data dev_data[] = {
.mw_count = 2,
.mw_idx = 2,
},
{ /* for device 0x17d7 */
.mw_count = 2,
.mw_idx = 2,
.is_endpoint = true,
},
};
static const struct pci_device_id amd_ntb_pci_tbl[] = {
@ -1319,6 +1333,8 @@ static const struct pci_device_id amd_ntb_pci_tbl[] = {
{ PCI_VDEVICE(AMD, 0x14c0), (kernel_ulong_t)&dev_data[1] },
{ PCI_VDEVICE(AMD, 0x14c3), (kernel_ulong_t)&dev_data[1] },
{ PCI_VDEVICE(AMD, 0x155a), (kernel_ulong_t)&dev_data[1] },
{ PCI_VDEVICE(AMD, 0x17d4), (kernel_ulong_t)&dev_data[1] },
{ PCI_VDEVICE(AMD, 0x17d7), (kernel_ulong_t)&dev_data[2] },
{ PCI_VDEVICE(HYGON, 0x145b), (kernel_ulong_t)&dev_data[0] },
{ 0, }
};

1
drivers/ntb/hw/amd/ntb_hw_amd.h
View File

@ -168,6 +168,7 @@ enum {
struct ntb_dev_data {
const unsigned char mw_count;
const unsigned int mw_idx;
const bool is_endpoint;
};
struct amd_ntb_dev;