Messages in this thread Patch in this message | | | From | Jon Mason <> | Subject | [PATCH 8/9] NTB: Enable Snoop on Primary Side | Date | Wed, 20 Nov 2013 17:21:29 -0700 |
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Enable Snoop from Primary to Secondary side on BAR23 and BAR45 on all TLPs. Previously, Snoop was only enabled from Secondary to Primary side. This can have a performance improvement on some workloads.
Also, make the code more obvious about how the link is being enabled.
Signed-off-by: Jon Mason <jon.mason@intel.com> --- drivers/ntb/ntb_hw.c | 17 ++++++++++++----- drivers/ntb/ntb_regs.h | 12 +++++++----- 2 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 391c377..80505ae 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -1316,10 +1316,16 @@ 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 + else { + u32 ntb_cntl; + /* Let's bring the NTB link up */ - writel(NTB_CNTL_BAR23_SNOOP | NTB_CNTL_BAR45_SNOOP, - ndev->reg_ofs.lnk_cntl); + ntb_cntl = readl(ndev->reg_ofs.lnk_cntl); + ntb_cntl &= ~(NTB_CNTL_LINK_DISABLE | NTB_CNTL_CFG_LOCK); + ntb_cntl |= NTB_CNTL_P2S_BAR23_SNOOP | NTB_CNTL_S2P_BAR23_SNOOP; + ntb_cntl |= NTB_CNTL_P2S_BAR45_SNOOP | NTB_CNTL_S2P_BAR45_SNOOP; + writel(ntb_cntl, ndev->reg_ofs.lnk_cntl); + } } static void ntb_hw_link_down(struct ntb_device *ndev) @@ -1333,8 +1339,9 @@ static void ntb_hw_link_down(struct ntb_device *ndev) /* 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; + ntb_cntl &= ~(NTB_CNTL_P2S_BAR23_SNOOP | NTB_CNTL_S2P_BAR23_SNOOP); + ntb_cntl &= ~(NTB_CNTL_P2S_BAR45_SNOOP | NTB_CNTL_S2P_BAR45_SNOOP); + ntb_cntl |= NTB_CNTL_LINK_DISABLE | NTB_CNTL_CFG_LOCK; writel(ntb_cntl, ndev->reg_ofs.lnk_cntl); } diff --git a/drivers/ntb/ntb_regs.h b/drivers/ntb/ntb_regs.h index a689f1c..9774506 100644 --- a/drivers/ntb/ntb_regs.h +++ b/drivers/ntb/ntb_regs.h @@ -143,11 +143,13 @@ #define BWD_LTSSMSTATEJMP_FORCEDETECT (1 << 2) #define BWD_IBIST_ERR_OFLOW 0x7FFF7FFF -#define NTB_CNTL_CFG_LOCK (1 << 0) -#define NTB_CNTL_LINK_DISABLE (1 << 1) -#define NTB_CNTL_BAR23_SNOOP (1 << 2) -#define NTB_CNTL_BAR45_SNOOP (1 << 6) -#define BWD_CNTL_LINK_DOWN (1 << 16) +#define NTB_CNTL_CFG_LOCK (1 << 0) +#define NTB_CNTL_LINK_DISABLE (1 << 1) +#define NTB_CNTL_S2P_BAR23_SNOOP (1 << 2) +#define NTB_CNTL_P2S_BAR23_SNOOP (1 << 4) +#define NTB_CNTL_S2P_BAR45_SNOOP (1 << 6) +#define NTB_CNTL_P2S_BAR45_SNOOP (1 << 8) +#define BWD_CNTL_LINK_DOWN (1 << 16) #define NTB_PPD_OFFSET 0x00D4 #define SNB_PPD_CONN_TYPE 0x0003 -- 1.7.9.5
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