Commit 48c2ce97 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc/pci: Change how re-assigning resouces work 



When PCI_REASSIGN_ALL_RSRC is set, we used to clear all bus resources
at the beginning of survey and re-allocate them later.

This changes it so instead, during early fixup, we mark all resources
as IORESOURCE_UNSET and move them down to be 0-based.

Later, if bus resources are still unset at the beginning of the survey,
then we clear them.

This shouldn't impact the re-assignment case on 4xx, but will enable
us to have the platform do some custom resource assignment before the
survey, by clearing individual resources IORESOURCE_UNSET bit.

Also limits the clutter in the kernel log from fixup when re-assigning
since we don't care about the offset applied to the BAR values in this
case.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 491b98c3

arch/powerpc/kernel/pci-common.c

+36 −30
Original line number Diff line number Diff line
@@ -921,14 +921,18 @@ static void __devinit pcibios_fixup_resources(struct pci_dev *dev) 
		struct resource *res = dev->resource + i;

		if (!res->flags)

			continue;

		/* On platforms that have PCI_PROBE_ONLY set, we don't

		 * consider 0 as an unassigned BAR value. It's technically

		 * a valid value, but linux doesn't like it... so when we can

		 * re-assign things, we do so, but if we can't, we keep it

		 * around and hope for the best...



		/* If we're going to re-assign everything, we mark all resources

		 * as unset (and 0-base them). In addition, we mark BARs starting

		 * at 0 as unset as well, except if PCI_PROBE_ONLY is also set

		 * since in that case, we don't want to re-assign anything

		 */

		if (res->start == 0 && !pci_has_flag(PCI_PROBE_ONLY)) {

			pr_debug("PCI:%s Resource %d %016llx-%016llx [%x] is unassigned\n",

		if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) ||

		    (res->start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) {

			/* Only print message if not re-assigning */

			if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC))

				pr_debug("PCI:%s Resource %d %016llx-%016llx [%x] "

					 "is unassigned\n",

					 pci_name(dev), i,

					 (unsigned long long)res->start,

					 (unsigned long long)res->end,
@@ -1042,6 +1046,16 @@ static void __devinit pcibios_fixup_bridge(struct pci_bus *bus) 
		if (i >= 3 && bus->self->transparent)

			continue;



		/* If we are going to re-assign everything, mark the resource

		 * as unset and move it down to 0

		 */

		if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {

			res->flags |= IORESOURCE_UNSET;

			res->end -= res->start;

			res->start = 0;

			continue;

		}



		pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n",

			 pci_name(dev), i,

			 (unsigned long long)res->start,\
@@ -1262,18 +1276,15 @@ void pcibios_allocate_bus_resources(struct pci_bus *bus) 
	pci_bus_for_each_resource(bus, res, i) {

		if (!res || !res->flags || res->start > res->end || res->parent)

			continue;



		/* If the resource was left unset at this point, we clear it */

		if (res->flags & IORESOURCE_UNSET)

			goto clear_resource;



		if (bus->parent == NULL)

			pr = (res->flags & IORESOURCE_IO) ?

				&ioport_resource : &iomem_resource;

		else {

			/* Don't bother with non-root busses when

			 * re-assigning all resources. We clear the

			 * resource flags as if they were colliding

			 * and as such ensure proper re-allocation

			 * later.

			 */

			if (pci_has_flag(PCI_REASSIGN_ALL_RSRC))

				goto clear_resource;

			pr = pci_find_parent_resource(bus->self, res);

			if (pr == res) {

				/* this happens when the generic PCI
@@ -1304,7 +1315,7 @@ void pcibios_allocate_bus_resources(struct pci_bus *bus) 
			if (reparent_resources(pr, res) == 0)

				continue;

		}

		printk(KERN_WARNING "PCI: Cannot allocate resource region "

		pr_warning("PCI: Cannot allocate resource region "

			   "%d of PCI bridge %d, will remap\n", i, bus->number);

	clear_resource:

		res->start = res->end = 0;
@@ -1451,16 +1462,11 @@ void __init pcibios_resource_survey(void) 
{

	struct pci_bus *b;



	/* Allocate and assign resources. If we re-assign everything, then

	 * we skip the allocate phase

	 */

	/* Allocate and assign resources */

	list_for_each_entry(b, &pci_root_buses, node)

		pcibios_allocate_bus_resources(b);



	if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {

	pcibios_allocate_resources(0);

	pcibios_allocate_resources(1);

	}



	/* Before we start assigning unassigned resource, we try to reserve

	 * the low IO area and the VGA memory area if they intersect the

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