On Wed, Feb 24, 2016 at 06:11:58PM -0800, Yinghai Lu wrote: > Meelis reported strange conflicts on sparc v210: > pci 0001:00:07.0: can't claim BAR 2 [mem 0x7ff00000000-0x7ff000fffff]: address conflict with 0001:00:07.0 [mem 0x7ff00000000-0x7ff000fffff] > pci 0001:00:06.0: can't claim BAR 0 [io 0x7fe01000000-0x7fe0100000f]: address conflict with 0001:00:07.0 [io 0x7fe01000000-0x7fe0100ffff] > pci 0001:00:0d.0: can't claim BAR 0 [io 0x7fe01000900-0x7fe01000907]: address conflict with 0001:00:07.0 [io 0x7fe01000000-0x7fe0100ffff] > pci 0001:00:0d.0: can't claim BAR 1 [io 0x7fe01000918-0x7fe0100091f]: address conflict with 0001:00:07.0 [io 0x7fe01000000-0x7fe0100ffff] > pci 0001:00:0d.0: can't claim BAR 2 [io 0x7fe01000910-0x7fe01000917]: address conflict with 0001:00:07.0 [io 0x7fe01000000-0x7fe0100ffff] > pci 0001:00:0d.0: can't claim BAR 3 [io 0x7fe01000908-0x7fe0100090f]: address conflict with 0001:00:07.0 [io 0x7fe01000000-0x7fe0100ffff] > pci 0001:00:0d.0: can't claim BAR 4 [io 0x7fe01000920-0x7fe0100092f]: address conflict with 0001:00:07.0 [io 0x7fe01000000-0x7fe0100ffff] > PCI: /pci@1e,600000 can't claim Video RAM area [mem 0x7ff000a0000-0x7ff000bffff]: address conflict with 0001:00:07.0 [mem 0x7ff00000000-0x7ff000fffff] > PCI: /pci@1e,600000 can't claim System ROM [mem 0x7ff000f0000-0x7ff000fffff]: address conflict with 0001:00:07.0 [mem 0x7ff00000000-0x7ff000fffff] > PCI: /pci@1e,600000 can't claim Video ROM [mem 0x7ff000c0000-0x7ff000c7fff]: address conflict with 0001:00:07.0 [mem 0x7ff00000000-0x7ff000fffff] > > we have > pci_bus 0001:00: root bus resource [io 0x7fe01000000-0x7fe01ffffff] (bus address [0x0000-0xffffff]) > pci_bus 0001:00: root bus resource [mem 0x7ff00000000-0x7ffffffffff] (bus address [0x00000000-0xffffffff]) > > so pci bus address in the bars for 0001:00:07.0 has all 0s. > > 0001:00:07.0 ISA bridge: ULi Electronics Inc. M1533/M1535/M1543 PCI to ISA Bridge [Aladdin IV/V/V+] > Region 0: [virtual] I/O ports at 0000 [size=64K] > Region 1: Memory at <unassigned> (32-bit, non-prefetchable) [size=1M] > Region 2: Memory at <unassigned> (32-bit, non-prefetchable) [size=1M] > 00: b9 10 33 15 0f 00 10 02 00 00 01 06 00 00 00 00 > 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 30: 00 00 00 00 a0 00 00 00 00 00 00 00 00 00 00 00 > > According to http://www.versalogic.com/Support/Downloads/pdf/ali1543.pdf > page 28: The indices before 40h are read-only. > and we have all 0 from 0x10-0x2f, according to lspci. > So those BAR do not work as regular BAR, just clean flags, and ignore them all > the way include claim and sizing and alloc etc. A BAR that is read-only zeroes is perfectly legal (PCI spec r3.0, sec 6.2.5.1) and __pci_read_base() handles it correctly. Maybe you're using something other than __pci_read_base() and the problem is there? The following dmesg logs show the [10b9:1533] device handled correctly, with no implemented BARs: https://bugs.freedesktop.org/attachment.cgi?id=118855 http://d11mgdpsdcgrvc.cloudfront.net/dmesg.txt http://www.hivmr.com/db/sasj1xfk98zsz9amfmpp1mdkzfk3pjk3 > Reported-by: Meelis Roos <mroos@xxxxxxxx> > Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx> > --- > drivers/pci/quirks.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index 051999e..2361a62 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -445,6 +445,21 @@ static void quirk_amd_nl_class(struct pci_dev *pdev) > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_NL_USB, > quirk_amd_nl_class); > > + > +/* > + * ALi m1533 pci to isa bridge does not have BAR according to datasheet, > + * clear the flags, so we will try to claim them or reallocate res. > + */ > +static void quirk_ali1533(struct pci_dev *dev) > +{ > + int i; > + > + for (i = 0; i < PCI_ROM_RESOURCE; i++) > + dev->resource[i].flags = 0; > +} > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, > + quirk_ali1533); > + > static void piix4_io_quirk(struct pci_dev *dev, const char *name, unsigned int port, unsigned int enable) > { > u32 devres; > -- > 1.8.4.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
