From 9fec60c41416c9c40ec520bb79064345d2396632 Mon Sep 17 00:00:00 2001 From: Jon Mason Date: Fri, 13 Sep 2013 17:05:23 -0700 Subject: NTB: Fix NTB-RP Link Up The Xeon NTB-RP setup, the transparent side does not get a link up/down interrupt. Since the presence of a NTB device on the transparent side means that we have a NTB link up, we can work around the lack of an interrupt by simply calling the link up function to notify the upper layers. Signed-off-by: Jon Mason --- drivers/ntb/ntb_hw.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) (limited to 'drivers/ntb') diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 6c9d73348735..a9b065f3973a 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -1296,6 +1296,32 @@ static void ntb_free_debugfs(struct ntb_device *ndev) } } +static void ntb_hw_link_up(struct ntb_device *ndev) +{ + if (ndev->conn_type == NTB_CONN_TRANSPARENT) + ntb_link_event(ndev, NTB_LINK_UP); + else + /* Let's bring the NTB link up */ + writel(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP, + ndev->reg_ofs.lnk_cntl); +} + +static void ntb_hw_link_down(struct ntb_device *ndev) +{ + u32 ntb_cntl; + + if (ndev->conn_type == NTB_CONN_TRANSPARENT) { + ntb_link_event(ndev, NTB_LINK_DOWN); + return; + } + + /* Bring NTB link down */ + ntb_cntl = readl(ndev->reg_ofs.lnk_cntl); + ntb_cntl &= ~(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP); + ntb_cntl |= NTB_CNTL_LINK_DISABLE; + writel(ntb_cntl, ndev->reg_ofs.lnk_cntl); +} + static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct ntb_device *ndev; @@ -1384,9 +1410,7 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (rc) goto err6; - /* Let's bring the NTB link up */ - writel(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP, - ndev->reg_ofs.lnk_cntl); + ntb_hw_link_up(ndev); return 0; @@ -1416,12 +1440,8 @@ static void ntb_pci_remove(struct pci_dev *pdev) { struct ntb_device *ndev = pci_get_drvdata(pdev); int i; - u32 ntb_cntl; - /* Bring NTB link down */ - ntb_cntl = readl(ndev->reg_ofs.lnk_cntl); - ntb_cntl |= NTB_CNTL_LINK_DISABLE; - writel(ntb_cntl, ndev->reg_ofs.lnk_cntl); + ntb_hw_link_down(ndev); ntb_transport_free(ndev->ntb_transport); -- cgit v1.2.3