[PATCH] PCI Allow OutOfRange PIRQ table address

I updated this to remove unnecessary variable initialization, make
check_routing be inline only and not __init, switch to strtoul, and
formatting fixes as per Randy Dunlap's recommendations.

I updated this to change pirq_table_addr to a long, and to add a warning
msg if the PIRQ table wasn't found at the specified address, as per thread
with Matthew Wilcox.

In our hardware situation, the BIOS is unable to store or generate it's PIRQ
table in the F0000h-100000h standard range. This patch adds a pci kernel
parameter, pirqaddr to allow the bootloader (or BIOS based loader) to inform
the kernel where the PIRQ table got stored. A beneficial side-effect is that,
if one's BIOS uses a static address each time for it's PIRQ table, then
pirqaddr can be used to avoid the $pirq search through that address block each
time at boot for normal PIRQ BIOSes.

Signed-off-by: Jaya Kumar <jayalk@intworks.biz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index f44bb5567c5b..96d924eb7b64 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1030,6 +1030,10 @@ running once the system is up.
                 irqmask=0xMMMM          [IA-32] Set a bit mask of IRQs allowed to be assigned
                                         automatically to PCI devices. You can make the kernel
                                         exclude IRQs of your ISA cards this way.
+                pirqaddr=0xAAAAA        [IA-32] Specify the physical address
+                                        of the PIRQ table (normally generated
+                                        by the BIOS) if it is outside the
+                                        F0000h-100000h range.
                 lastbus=N               [IA-32] Scan all buses till bus #N. Can be useful
                                         if the kernel is unable to find your secondary buses
                                         and you want to tell it explicitly which ones they are.