staging/rdma/hfi1: Enable WFR PCIe extended tags from the driver

Some BIOS implementations turn off extended tags in DevCtl (a RW
field) even though it was originally set and is advertised in DevCap
Fix is to set it in the driver

Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Vennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rdma/hfi1/pcie.c b/drivers/staging/rdma/hfi1/pcie.c
index f531d0f6b212f54054993f094d10acbeb846c906..7fcf0896b65abefd9b879c120bb3171ef076234b 100644 (file)
--- a/drivers/staging/rdma/hfi1/pcie.c
+++ b/drivers/staging/rdma/hfi1/pcie.c
@@ -467,8 +467,18 @@ static void tune_pcie_caps(struct hfi1_devdata *dd)
 {
        struct pci_dev *parent;
        u16 rc_mpss, rc_mps, ep_mpss, ep_mps;
-       u16 rc_mrrs, ep_mrrs, max_mrrs;
+       u16 rc_mrrs, ep_mrrs, max_mrrs, ectl;
 
+       /*
+        * Turn on extended tags in DevCtl in case the BIOS has turned it off
+        * to improve WFR SDMA bandwidth
+        */
+       pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &ectl);
+       if (!(ectl & PCI_EXP_DEVCTL_EXT_TAG)) {
+               dd_dev_info(dd, "Enabling PCIe extended tags\n");
+               ectl |= PCI_EXP_DEVCTL_EXT_TAG;
+               pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL, ectl);
+       }
        /* Find out supported and configured values for parent (root) */
        parent = dd->pcidev->bus->self;
        if (!pci_is_root_bus(parent->bus)) {