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    Subject[PATCH 3/6] PCI Express get/set read request size
    Add PCI infrastructure for setting read request size.
    The pcie_get_readrq is commented out because there are no drivers
    that need it.


    ---
    drivers/pci/pci.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++-
    include/linux/pci.h | 4 ++-
    2 files changed, 67 insertions(+), 2 deletions(-)

    --- pci-x.orig/drivers/pci/pci.c
    +++ pci-x/drivers/pci/pci.c
    @@ -1139,7 +1139,70 @@ out:
    }
    EXPORT_SYMBOL(pcix_set_mmrbc);

    -
    +#if 0
    +/**
    + * pcie_get_readrq - get PCI Express read request size
    + * @dev: PCI device to query
    + *
    + * Returns maximum memory read request in bytes
    + * or appropriate error value.
    + */
    +int pcie_get_readrq(struct pci_dev *dev)
    +{
    + int ret, cap;
    + u16 ctl;
    +
    + cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
    + if (!cap)
    + return -EINVAL;
    +
    + ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
    + if (!ret)
    + ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(pcie_get_readrq);
    +#endif
    +
    +/**
    + * pcie_set_readrq - set PCI Express maximum memory read request
    + * @dev: PCI device to query
    + * @count: maximum memory read count in bytes
    + * valid values are 128, 256, 512, 1024, 2048, 4096
    + *
    + * If possible sets maximum read byte count
    + */
    +int
    +pcie_set_readrq(struct pci_dev *dev, int count)
    +{
    + int cap, err = -EINVAL;
    + u16 ctl, v;
    +
    + if (count < 128 || count > 4096 || (count & (count-1)))
    + goto out;
    +
    + v = (ffs(count) - 8) << 12;
    +
    + cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
    + if (!cap)
    + goto out;
    +
    + err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
    + if (err)
    + goto out;
    +
    + if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
    + ctl &= ~PCI_EXP_DEVCTL_READRQ;
    + ctl |= v;
    + err = pci_write_config_dword(dev, cap + PCI_EXP_DEVCTL, ctl);
    + }
    +
    +out:
    + return err;
    +}
    +EXPORT_SYMBOL(pcie_set_readrq);
    +
    static int __devinit pci_init(void)
    {
    struct pci_dev *dev = NULL;
    --- pci-x.orig/include/linux/pci.h
    +++ pci-x/include/linux/pci.h
    @@ -513,7 +513,9 @@ void pci_intx(struct pci_dev *dev, int e
    int pci_set_dma_mask(struct pci_dev *dev, u64 mask);
    int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask);
    int pcix_get_mmrbc(struct pci_dev *dev);
    -int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc);
    +int pcix_set_mmrbc(struct pci_dev *dev, int rq);
    +int pcie_get_readrq(struct pci_dev *dev);
    +int pcie_set_readrq(struct pci_dev *dev, int rq);
    void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno);
    int __must_check pci_assign_resource(struct pci_dev *dev, int i);
    int __must_check pci_assign_resource_fixed(struct pci_dev *dev, int i);
    --

    -
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