• Benjamin Herrenschmidt's avatar
    [POWERPC] Allow hooking of PCI MMIO & PIO accessors on 64 bits · 4cb3cee0
    Benjamin Herrenschmidt authored
    This patch reworks the way iSeries hooks on PCI IO operations (both MMIO
    and PIO) and provides a generic way for other platforms to do so (we
    have need to do that for various other platforms).
    
    While reworking the IO ops, I ended up doing some spring cleaning in
    io.h and eeh.h which I might want to split into 2 or 3 patches (among
    others, eeh.h had a lot of useless stuff in it).
    
    A side effect is that EEH for PIO should work now (it used to pass IO
    ports down to the eeh address check functions which is bogus).
    
    Also, new are MMIO "repeat" ops, which other archs like ARM already had,
    and that we have too now: readsb, readsw, readsl, writesb, writesw,
    writesl.
    
    In the long run, I might also make EEH use the hooks instead
    of wrapping at the toplevel, which would make things even cleaner and
    relegate EEH completely in platforms/iseries, but we have to measure the
    performance impact there (though it's really only on MMIO reads)
    
    Since I also need to hook on ioremap, I shuffled the functions a bit
    there. I introduced ioremap_flags() to use by drivers who want to pass
    explicit flags to ioremap (and it can be hooked). The old __ioremap() is
    still there as a low level and cannot be hooked, thus drivers who use it
    should migrate unless they know they want the low level version.
    
    The patch "arch provides generic iomap missing accessors" (should be
    number 4 in this series) is a pre-requisite to provide full iomap
    API support with this patch.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    4cb3cee0
pci_64.c 36.8 KB