IB/mthca: Use PCI-X/PCI-Express read control interfaces

These driver changes incorporate the proposed PCI-X / PCI-Express read
byte count interface.  Reading and setting those values doesn't take
place "manually", instead wrapping functions are called to allow
quirks for some PCI bridges.

Signed-off by: Peter Oruba <peter.oruba@amd.com>
Based on work by Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Roland Dreier <rolandd@cisco.com>
Cc: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index 04c1520..60de6f9 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -137,40 +137,23 @@ static const char mthca_version[] __devinitdata =
 
 static int mthca_tune_pci(struct mthca_dev *mdev)
 {
-       int cap;
-       u16 val;
-
        if (!tune_pci)
                return 0;
 
        /* First try to max out Read Byte Count */
-       cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX);
-       if (cap) {
-               if (pci_read_config_word(mdev->pdev, cap + PCI_X_CMD, &val)) {
-                       mthca_err(mdev, "Couldn't read PCI-X command register, "
-                                 "aborting.\n");
-                       return -ENODEV;
-               }
-               val = (val & ~PCI_X_CMD_MAX_READ) | (3 << 2);
-               if (pci_write_config_word(mdev->pdev, cap + PCI_X_CMD, val)) {
-                       mthca_err(mdev, "Couldn't write PCI-X command register, "
-                                 "aborting.\n");
+       if (pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX)) {
+               if (pcix_set_mmrbc(mdev->pdev, pcix_get_max_mmrbc(mdev->pdev))) {
+                       mthca_err(mdev, "Couldn't set PCI-X max read count, "
+                               "aborting.\n");
                        return -ENODEV;
                }
        } else if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE))
                mthca_info(mdev, "No PCI-X capability, not setting RBC.\n");
 
-       cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_EXP);
-       if (cap) {
-               if (pci_read_config_word(mdev->pdev, cap + PCI_EXP_DEVCTL, &val)) {
-                       mthca_err(mdev, "Couldn't read PCI Express device control "
-                                 "register, aborting.\n");
-                       return -ENODEV;
-               }
-               val = (val & ~PCI_EXP_DEVCTL_READRQ) | (5 << 12);
-               if (pci_write_config_word(mdev->pdev, cap + PCI_EXP_DEVCTL, val)) {
-                       mthca_err(mdev, "Couldn't write PCI Express device control "
-                                 "register, aborting.\n");
+       if (pci_find_capability(mdev->pdev, PCI_CAP_ID_EXP)) {
+               if (pcie_set_readrq(mdev->pdev, 4096)) {
+                       mthca_err(mdev, "Couldn't write PCI Express read request, "
+                               "aborting.\n");
                        return -ENODEV;
                }
        } else if (mdev->mthca_flags & MTHCA_FLAG_PCIE)