Eric Lee / smarc-fsl-linux-kernel

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  • 3d5134ee8   [POWERPC] Rewrite IO allocation & mapping on powerpc64 ... Browse Code »

    This rewrites pretty much from scratch the handling of MMIO and PIO
    space allocations on powerpc64. The main goals are:

    - Get rid of imalloc and use more common code where possible
    - Simplify the current mess so that PIO space is allocated and
    mapped in a single place for PCI bridges
    - Handle allocation constraints of PIO for all bridges including
    hot plugged ones within the 2GB space reserved for IO ports,
    so that devices on hotplugged busses will now work with drivers
    that assume IO ports fit in an int.
    - Cleanup and separate tracking of the ISA space in the reserved
    low 64K of IO space. No ISA -> Nothing mapped there.

    I booted a cell blade with IDE on PIO and MMIO and a dual G5 so
    far, that's it :-)

    With this patch, all allocations are done using the code in
    mm/vmalloc.c, though we use the low level __get_vm_area with
    explicit start/stop constraints in order to manage separate
    areas for vmalloc/vmap, ioremap, and PCI IOs.

    This greatly simplifies a lot of things, as you can see in the
    diffstat of that patch :-)

    A new pair of functions pcibios_map/unmap_io_space() now replace
    all of the previous code that used to manipulate PCI IOs space.
    The allocation is done at mapping time, which is now called from
    scan_phb's, just before the devices are probed (instead of after,
    which is by itself a bug fix). The only other caller is the PCI
    hotplug code for hot adding PCI-PCI bridges (slots).

    imalloc is gone, as is the "sub-allocation" thing, but I do beleive
    that hotplug should still work in the sense that the space allocation
    is always done by the PHB, but if you unmap a child bus of this PHB
    (which seems to be possible), then the code should properly tear
    down all the HPTE mappings for that area of the PHB allocated IO space.

    I now always reserve the first 64K of IO space for the bridge with
    the ISA bus on it. I have moved the code for tracking ISA in a separate
    file which should also make it smarter if we ever are capable of
    hot unplugging or re-plugging an ISA bridge.

    This should have a side effect on platforms like powermac where VGA IOs
    will no longer work. This is done on purpose though as they would have
    worked semi-randomly before. The idea at this point is to isolate drivers
    that might need to access those and fix them by providing a proper
    function to obtain an offset to the legacy IOs of a given bus.

    Signed-off-by: Benjamin Herrenschmidt
    Signed-off-by: Paul Mackerras

    Benjamin Herrenschmidt