>From stable-bounces@linux.kernel.org Tue Mar 13 11:05:30 2007 From: Jan Beulich Date: Tue, 13 Mar 2007 14:04:11 -0400 Subject: adjust legacy IDE resource setting (v2) To: linux-stable Message-ID: <45F6E79B.1010208@redhat.com> From: Jan Beulich adjust legacy IDE resource setting (v2) The change to force legacy mode IDE channels' resources to fixed non-zero values confuses (at least some versions of) X, because the values reported by the kernel and those readable from PCI config space aren't consistent anymore. Therefore, this patch arranges for the respective BARs to also get updated if possible. Signed-off-by: Jan Beulich Acked-by: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Bartlomiej Zolnierkiewicz Cc: Chuck Ebbert Signed-off-by: Greg Kroah-Hartman --- drivers/pci/probe.c | 45 ++++++++++++++++++++++++++++++++------------- 1 file changed, 32 insertions(+), 13 deletions(-) --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -639,7 +639,34 @@ static void pci_read_irq(struct pci_dev dev->irq = irq; } -#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) +static void change_legacy_io_resource(struct pci_dev * dev, unsigned index, + unsigned start, unsigned end) +{ + unsigned base = start & PCI_BASE_ADDRESS_IO_MASK; + unsigned len = (end | ~PCI_BASE_ADDRESS_IO_MASK) - base + 1; + + /* + * Some X versions get confused when the BARs reported through + * /sys or /proc differ from those seen in config space, thus + * try to update the config space values, too. + */ + if (!(pci_resource_flags(dev, index) & IORESOURCE_IO)) + printk(KERN_WARNING "%s: cannot adjust BAR%u (not I/O)\n", + pci_name(dev), index); + else if (pci_resource_len(dev, index) != len) + printk(KERN_WARNING "%s: cannot adjust BAR%u (size %04X)\n", + pci_name(dev), index, (unsigned)pci_resource_len(dev, index)); + else { + printk(KERN_INFO "%s: trying to change BAR%u from %04X to %04X\n", + pci_name(dev), index, + (unsigned)pci_resource_start(dev, index), base); + pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + index * 4, base); + } + pci_resource_start(dev, index) = start; + pci_resource_end(dev, index) = end; + pci_resource_flags(dev, index) = + IORESOURCE_IO | IORESOURCE_PCI_FIXED | PCI_BASE_ADDRESS_SPACE_IO; +} /** * pci_setup_device - fill in class and map information of a device @@ -692,20 +719,12 @@ static int pci_setup_device(struct pci_d u8 progif; pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); if ((progif & 1) == 0) { - dev->resource[0].start = 0x1F0; - dev->resource[0].end = 0x1F7; - dev->resource[0].flags = LEGACY_IO_RESOURCE; - dev->resource[1].start = 0x3F6; - dev->resource[1].end = 0x3F6; - dev->resource[1].flags = LEGACY_IO_RESOURCE; + change_legacy_io_resource(dev, 0, 0x1F0, 0x1F7); + change_legacy_io_resource(dev, 1, 0x3F6, 0x3F6); } if ((progif & 4) == 0) { - dev->resource[2].start = 0x170; - dev->resource[2].end = 0x177; - dev->resource[2].flags = LEGACY_IO_RESOURCE; - dev->resource[3].start = 0x376; - dev->resource[3].end = 0x376; - dev->resource[3].flags = LEGACY_IO_RESOURCE; + change_legacy_io_resource(dev, 2, 0x170, 0x177); + change_legacy_io_resource(dev, 3, 0x376, 0x376); } } break;