The HP nx6325 BIOS doesn't report any devices in the [0xf8000000-0xfbffffff] region via ACPI devices or the E820 memory map, but when we assign it to the 00:14.4 bridge as a prefetchable memory window, the machine hangs. I determined experimentally that there are only three 1MB regions in that area that cause trouble, so this fixup builds a fake PNP device that consumes those regions. Reference: https://bugzilla.kernel.org/show_bug.cgi?id=23332 Reported-by: Rafael J. Wysocki <rjw@xxxxxxx> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx> --- drivers/pnp/quirks.c | 30 ++++++++++++++++++++++++++++++ 1 files changed, 30 insertions(+), 0 deletions(-) diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c index f18bb69..e7de402 100644 --- a/drivers/pnp/quirks.c +++ b/drivers/pnp/quirks.c @@ -343,7 +343,37 @@ static struct pnp_protocol pnp_fixup_protocol = { .name = "Plug and Play fixup", }; +static int __init hp_nx6325_fixup(const struct dmi_system_id *d) +{ + struct pnp_dev *dev; + + /* + * The BIOS apparently forgot to describe some regions in the + * address map. See https://bugzilla.kernel.org/show_bug.cgi?id=23332 + */ + + dev = pnp_alloc_dev(&pnp_fixup_protocol, 0, "LNXHAZRD"); + if (!dev) + return 0; + + dev->active = 1; + pnp_add_mem_resource(dev, 0xf8300000, 0xf83fffff, 0); + pnp_add_mem_resource(dev, 0xf8500000, 0xf85fffff, 0); + pnp_add_mem_resource(dev, 0xf9100000, 0xf91fffff, 0); + pnp_add_device(dev); + dev_info(&dev->dev, "added to work around BIOS defect\n"); + return 0; +} + static const struct dmi_system_id pnp_fixup_table[] __initconst = { + { + .callback = hp_nx6325_fixup, + .ident = "HP nx6325 laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"), + }, + }, {} }; -- 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
