Commit 223d96fc authored by Yinghai Lu's avatar Yinghai Lu Committed by Bjorn Helgaas
Browse files

PCI: Look for unassigned resources on per-bus basis 



When CONFIG_PCI_REALLOC_ENABLE_AUTO=y, pci_realloc_detect() looks at PCI
devices to see if any have SR-IOV resources that need to be assigned.  If
it finds any, it turns on automatic resource reallocation.

This patch changes pci_realloc_detect() so it uses pci_walk_bus() on
each root bus instead of using for_each_pci_dev().  This is a step
toward doing reallocation on a per-bus basis, so we can do it for
a hot-added host bridge.

[bhelgaas: changelog, rename callback to iov_resources_unassigned(), use
boolean for "unassigned"]
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 61e83cdd

drivers/pci/setup-bus.c

+29 −15
Original line number Diff line number Diff line
@@ -1359,30 +1359,44 @@ static bool __init pci_realloc_enabled(void) 
	return pci_realloc_enable >= user_enabled;

}



static void __init pci_realloc_detect(void)

{

#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)

	struct pci_dev *dev = NULL;



	if (pci_realloc_enable != undefined)

		return;



	for_each_pci_dev(dev) {

static int __init iov_resources_unassigned(struct pci_dev *dev, void *data)

{

	int i;

	bool *unassigned = data;



	for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {

		struct resource *r = &dev->resource[i];



			/* Not assigned, or rejected by kernel ? */

		/* Not assigned or rejected by kernel? */

		if (r->flags && !r->start) {

				pci_realloc_enable = auto_enabled;

			*unassigned = true;

			return 1; /* return early from pci_walk_bus() */

		}

	}



	return 0;

}



static void  __init pci_realloc_detect(void)

{

	bool unassigned = false;

	struct pci_bus *bus;



	if (pci_realloc_enable != undefined)

		return;



	list_for_each_entry(bus, &pci_root_buses, node) {

		pci_walk_bus(bus, iov_resources_unassigned, &unassigned);

		if (unassigned) {

			pci_realloc_enable = auto_enabled;

			return;

		}

	}

}

#else

static void __init pci_realloc_detect(void) { }

#endif

}



/*

 * first try will not touch pci bridge res

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