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    SubjectPCI resource allocation (was Re: Ok, making ready for pre-2.4 and code-freeze..)

    > Eh why not? Last time I checked it worked.

    On the i386, yes. On Alpha, probably not. Allocation of PCI address spaces
    is unfortunately not a simple task -- you need to obey various strange alignment
    requirements :( Also, the mapping between physical and bus addresses differs
    from architecture to architecture even for I/O addresses.

    > Anyway, the sonicvibes driver _needs_ to be able to allocate these resources,
    > noone else is going to do this for it, as the sonicvibes chip uses
    > nonstandard registers for the DDMA address, and no BIOS I've seen knows about
    > sonicvibes peculiarity.
    > Any suggestion?

    We should define a PCI layer function (architecture specific) allowing drivers
    to ask for assigning of new resources (see the patch below).

    DaveM, does this look reasonable? I've noticed pdev_assign_unassigned_resources()
    being passed min_io and min_mem arguments, but I think we should just adjust resources
    of the parent bus instead.

    Have a nice fortnight
    Martin `MJ' Mares <> <>
    "P.C.M.C.I.A. stands for `People Can't Memorize Computer Industry Acronyms'"

    --- include/linux/pci.h.mj Mon Dec 20 11:00:44 1999
    +++ include/linux/pci.h Mon Dec 20 11:01:43 1999
    @@ -413,14 +413,15 @@

    void pcibios_init(void);
    void pcibios_fixup_bus(struct pci_bus *);
    -void pcibios_fixup_pbus_ranges(struct pci_bus *, struct pbus_set_ranges_data *);
    int pcibios_enable_device(struct pci_dev *);
    char *pcibios_setup (char *str);

    +/* Used only when drivers/pci/setup.c is used */
    void pcibios_align_resource(void *, struct resource *, unsigned long);
    void pcibios_update_resource(struct pci_dev *, struct resource *,
    struct resource *, int);
    void pcibios_update_irq(struct pci_dev *, int irq);
    +void pcibios_fixup_pbus_ranges(struct pci_bus *, struct pbus_set_ranges_data *);

    /* Backward compatibility, don't use in new code! */

    @@ -443,7 +444,7 @@
    unsigned short index, unsigned char *bus,
    unsigned char *dev_fn);

    -/* Generic PCI interface functions */
    +/* Generic PCI functions used internally */

    void pci_init(void);
    struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
    @@ -454,6 +455,8 @@
    void pci_read_bridge_bases(struct pci_bus *child);
    struct resource *pci_find_parent_resource(struct pci_dev *dev, struct resource *res);

    +/* Generic PCI functions exported to card drivers */
    struct pci_dev *pci_find_device (unsigned int vendor, unsigned int device, struct pci_dev *from);
    struct pci_dev *pci_find_subsys (unsigned int vendor, unsigned int device,
    unsigned int ss_vendor, unsigned int ss_device,
    @@ -470,9 +473,11 @@
    int pci_write_config_byte(struct pci_dev *dev, int where, u8 val);
    int pci_write_config_word(struct pci_dev *dev, int where, u16 val);
    int pci_write_config_dword(struct pci_dev *dev, int where, u32 val);
    int pci_enable_device(struct pci_dev *dev);
    void pci_set_master(struct pci_dev *dev);
    int pci_set_power_state(struct pci_dev *dev, int state);
    +int pci_assign_resource(struct pci_dev *dev, int i);

    /* Helper functions for low-level code (drivers/pci/setup.c) */

    --- arch/i386/kernel/pci-i386.c.mj Mon Dec 20 10:56:27 1999
    +++ arch/i386/kernel/pci-i386.c Mon Dec 20 10:56:27 1999
    @@ -102,7 +102,7 @@
    * Expects start=0, end=size-1, flags=resource type.

    -static int __init pcibios_assign_resource(struct pci_dev *dev, int i)
    +int pci_assign_resource(struct pci_dev *dev, int i)
    struct resource *r = &dev->resource[i];
    struct resource *pr = pci_find_parent_resource(dev, r);
    @@ -272,7 +272,7 @@
    * the BIOS forgot to do so or because we have decided the old
    * address was unusable for some reason.
    - pcibios_assign_resource(dev, idx);
    + pci_assign_resource(dev, idx);
    if (pci_probe & PCI_ASSIGN_ROMS) {
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