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    Subject[PATCH -v2 20/26] PCI: Add addon_resource support for pci_dev
    Date
    Will add addon_resources list in pci_dev, it will be used for resources
    other than standard, rom, sriov, bridges.
    Some could be same as std reg, but using different register.
    Some could have own way to read/write to them.

    Kernel using different way to hack those resources like abusing
    pci bridge resource spot on non bridge pci device.

    With this patch, will treat addon-resource like standard resource with
    special ops.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    drivers/pci/probe.c | 18 ++++++++++++++++++
    include/linux/pci.h | 16 ++++++++++++++++
    2 files changed, 34 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
    index dfa56fb..6dbad5b 100644
    --- a/drivers/pci/probe.c
    +++ b/drivers/pci/probe.c
    @@ -82,6 +82,12 @@ struct resource *pci_dev_resource_n(struct pci_dev *dev, int n)
    if (n < PCI_NUM_RESOURCES)
    return &dev->resource[n];

    + n -= PCI_NUM_RESOURCES;
    + list_for_each_entry(addon_res, &dev->addon_resources, list) {
    + if (n-- == 0)
    + return &addon_res->res;
    + }
    +
    return NULL;
    }

    @@ -97,6 +103,16 @@ int pci_dev_resource_idx(struct pci_dev *dev, struct resource *res)
    return -1;
    }

    +static void pci_release_dev_addon_res(struct pci_dev *dev)
    +{
    + struct pci_dev_addon_resource *addon_res, *tmp;
    +
    + list_for_each_entry_safe(addon_res, tmp, &dev->addon_resources, list) {
    + list_del(&addon_res->list);
    + kfree(addon_res);
    + }
    +}
    +
    static u64 pci_size(u64 base, u64 maxbase, u64 mask)
    {
    u64 size = mask & maxbase; /* Find the significant bits */
    @@ -1288,6 +1304,7 @@ static void pci_release_dev(struct device *dev)
    pci_dev = to_pci_dev(dev);
    pci_release_capabilities(pci_dev);
    pci_release_of_node(pci_dev);
    + pci_release_dev_addon_res(pci_dev);
    kfree(pci_dev);
    }

    @@ -1367,6 +1384,7 @@ struct pci_dev *alloc_pci_dev(void)
    return NULL;

    INIT_LIST_HEAD(&dev->bus_list);
    + INIT_LIST_HEAD(&dev->addon_resources);

    return dev;
    }
    diff --git a/include/linux/pci.h b/include/linux/pci.h
    index c7a2806..2c8b1a4 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -299,6 +299,7 @@ struct pci_dev {
    */
    unsigned int irq;
    struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
    + struct list_head addon_resources; /* addon I/O and memory resource */

    /* These fields are used by common fixups */
    unsigned int transparent:1; /* Transparent PCI bridge */
    @@ -347,6 +348,21 @@ struct pci_dev {
    #endif
    };

    +struct resource_ops {
    + int (*read)(struct pci_dev *dev, struct resource *res, int addr);
    + int (*write)(struct pci_dev *dev, struct resource *res, int addr);
    +};
    +
    +struct pci_dev_addon_resource {
    + struct list_head list;
    + int reg_addr;
    + int size;
    + struct resource res;
    + struct resource_ops *ops;
    +};
    +#define to_pci_dev_addon_resource(n) \
    + container_of(n, struct pci_dev_addon_resource, res)
    +
    struct resource *pci_dev_resource_n(struct pci_dev *dev, int n);
    int pci_dev_resource_idx(struct pci_dev *dev, struct resource *res);

    --
    1.7.7


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