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Subject[patch] x86: pci_assign_unassigned_resources() update
Sorry, I've been on vacation, so I missed quite a few interesting
things that went into 2.6.13 (particularly the change for ROM resource
assignment, which looks excellent).
On the other hand, I had some time to think about PCI assign issues
in 2.6.13-rc series.

The major problem here is that we call pci_assign_unassigned_resources()
way too early - at subsys_initcall level. Therefore we give no chances
to ACPI and PnP routines (called at fs_initcall level) to reserve their
respective resources properly, as the comments in drivers/pnp/system.c
and drivers/acpi/motherboard.c suggest:
/**
* Reserve motherboard resources after PCI claim BARs,
* but before PCI assign resources for uninitialized PCI devices
*/

So I moved pci_assign_unassigned_resources() call to pcibios_assign_resources()
(fs_initcall), which should hopefully fix a lot of problems and make
PCIBIOS_MIN_IO tweaks unnecessary.
Other changes:
- remove resource assignment code from pcibios_assign_resources(), since
it duplicates pci_assign_unassigned_resources() functionality and
actually does nothing in 2.6.13;
- modify ROM assignment code as per Ben's suggestion: try to use firmware
settings by default (if PCI_ASSIGN_ROMS is not set);
- set CARDBUS_IO_SIZE back to 4K as it's a wonderful stress test for
various setups.

Tero, can you confirm that 2.6.13 with this patch works for you?

Ivan.

--- 2.6.13/arch/i386/pci/common.c 2005-08-29 03:41:01.000000000 +0400
+++ linux/arch/i386/pci/common.c 2005-08-30 13:44:24.000000000 +0400
@@ -165,7 +165,6 @@ static int __init pcibios_init(void)
if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
pcibios_sort();
#endif
- pci_assign_unassigned_resources();
return 0;
}

--- 2.6.13/arch/i386/pci/i386.c 2005-08-29 03:41:01.000000000 +0400
+++ linux/arch/i386/pci/i386.c 2005-08-30 17:35:03.000000000 +0400
@@ -170,43 +170,26 @@ static void __init pcibios_allocate_reso
static int __init pcibios_assign_resources(void)
{
struct pci_dev *dev = NULL;
- int idx;
- struct resource *r;
+ struct resource *r, *pr;

- for_each_pci_dev(dev) {
- int class = dev->class >> 8;
-
- /* Don't touch classless devices and host bridges */
- if (!class || class == PCI_CLASS_BRIDGE_HOST)
- continue;
-
- for(idx=0; idx<6; idx++) {
- r = &dev->resource[idx];
-
- /*
- * Don't touch IDE controllers and I/O ports of video cards!
- */
- if ((class == PCI_CLASS_STORAGE_IDE && idx < 4) ||
- (class == PCI_CLASS_DISPLAY_VGA && (r->flags & IORESOURCE_IO)))
- continue;
-
- /*
- * We shall assign a new address to this resource, either because
- * the BIOS forgot to do so or because we have decided the old
- * address was unusable for some reason.
- */
- if (!r->start && r->end)
- pci_assign_resource(dev, idx);
- }
-
- if (pci_probe & PCI_ASSIGN_ROMS) {
+ if (!(pci_probe & PCI_ASSIGN_ROMS)) {
+ /* Try to use BIOS settings for ROMs, otherwise let
+ pci_assign_unassigned_resources() allocate the new
+ addresses. */
+ for_each_pci_dev(dev) {
r = &dev->resource[PCI_ROM_RESOURCE];
- r->end -= r->start;
- r->start = 0;
- if (r->end)
- pci_assign_resource(dev, PCI_ROM_RESOURCE);
+ if (!r->flags || !r->start)
+ continue;
+ pr = pci_find_parent_resource(dev, r);
+ if (!pr || request_resource(pr, r) < 0) {
+ r->end -= r->start;
+ r->start = 0;
+ }
}
}
+
+ pci_assign_unassigned_resources();
+
return 0;
}

--- 2.6.13/drivers/pci/setup-bus.c 2005-08-29 03:41:01.000000000 +0400
+++ linux/drivers/pci/setup-bus.c 2005-08-30 13:44:24.000000000 +0400
@@ -40,7 +40,7 @@
* FIXME: IO should be max 256 bytes. However, since we may
* have a P2P bridge below a cardbus bridge, we need 4K.
*/
-#define CARDBUS_IO_SIZE (256)
+#define CARDBUS_IO_SIZE (4*1024)
#define CARDBUS_MEM_SIZE (32*1024*1024)

static void __devinit
-
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