Commit a855b1a7 authored by Peter Oruba's avatar Peter Oruba Committed by Roland Dreier

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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 3c10c7c9
......@@ -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)
......
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