Messages in this thread Patch in this message | | | From | Jiasen Lin <> | Subject | [PATCH] NTB: Fix an error in get link status | Date | Thu, 7 Nov 2019 01:35:36 -0800 |
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The offset of PCIe Capability Header for AMD and HYGON NTB is 0x64, but the macro which named "AMD_LINK_STATUS_OFFSET" is defined as 0x68. It is offset of Device Capabilities Reg rather than Link Control Reg.
This code trigger an error in get link statsus:
cat /sys/kernel/debug/ntb_hw_amd/0000:43:00.1/info LNK STA - 0x8fa1 Link Status - Up Link Speed - PCI-E Gen 0 Link Width - x0
This patch use pcie_capability_read_dword to get link status. After fix this issue, we can get link status accurately:
cat /sys/kernel/debug/ntb_hw_amd/0000:43:00.1/info LNK STA - 0x11030042 Link Status - Up Link Speed - PCI-E Gen 3 Link Width - x16
Signed-off-by: Jiasen Lin <linjiasen@hygon.cn> --- drivers/ntb/hw/amd/ntb_hw_amd.c | 5 +++-- drivers/ntb/hw/amd/ntb_hw_amd.h | 1 - 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c index 156c2a1..ae91105 100644 --- a/drivers/ntb/hw/amd/ntb_hw_amd.c +++ b/drivers/ntb/hw/amd/ntb_hw_amd.c @@ -855,8 +855,8 @@ static int amd_poll_link(struct amd_ntb_dev *ndev) ndev->cntl_sta = reg; - rc = pci_read_config_dword(ndev->ntb.pdev, - AMD_LINK_STATUS_OFFSET, &stat); + rc = pcie_capability_read_dword(ndev->ntb.pdev, + PCI_EXP_LNKCTL, &stat); if (rc) return 0; ndev->lnk_sta = stat; @@ -1139,6 +1139,7 @@ static const struct ntb_dev_data dev_data[] = { static const struct pci_device_id amd_ntb_pci_tbl[] = { { PCI_VDEVICE(AMD, 0x145b), (kernel_ulong_t)&dev_data[0] }, { PCI_VDEVICE(AMD, 0x148b), (kernel_ulong_t)&dev_data[1] }, + { PCI_VDEVICE(HYGON, 0x145b), (kernel_ulong_t)&dev_data[0] }, { 0, } }; MODULE_DEVICE_TABLE(pci, amd_ntb_pci_tbl); diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.h b/drivers/ntb/hw/amd/ntb_hw_amd.h index 139a307..39e5d18 100644 --- a/drivers/ntb/hw/amd/ntb_hw_amd.h +++ b/drivers/ntb/hw/amd/ntb_hw_amd.h @@ -53,7 +53,6 @@ #include <linux/pci.h> #define AMD_LINK_HB_TIMEOUT msecs_to_jiffies(1000) -#define AMD_LINK_STATUS_OFFSET 0x68 #define NTB_LIN_STA_ACTIVE_BIT 0x00000002 #define NTB_LNK_STA_SPEED_MASK 0x000F0000 #define NTB_LNK_STA_WIDTH_MASK 0x03F00000 -- 2.7.4
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