From: Jiasen Lin linjiasen@hygon.cn
mainline inclusion from mainline-v5.7-rc1 commit bb81bf62151031df004864eabee0431c8b8e9064 category: bugfix bugzilla: NA CVE: NA ---------------------------
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
Fixes: a1b3695820aa4 ("NTB: Add support for AMD PCI-Express Non-Transparent Bridge") Signed-off-by: Jiasen Lin linjiasen@hygon.cn Signed-off-by: Jon Mason jdmason@kudzu.us Signed-off-by: Hanjun Guo guohanjun@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/ntb/hw/amd/ntb_hw_amd.c | 4 ++-- drivers/ntb/hw/amd/ntb_hw_amd.h | 1 - 2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c index 33245b1e86d4..ffc5a963e574 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; diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.h b/drivers/ntb/hw/amd/ntb_hw_amd.h index 8f3617a46292..81d634bb72c8 100644 --- a/drivers/ntb/hw/amd/ntb_hw_amd.h +++ b/drivers/ntb/hw/amd/ntb_hw_amd.h @@ -54,7 +54,6 @@
#define PCI_DEVICE_ID_AMD_NTB 0x145B #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