Commit 967260cd authored by Yinghai Lu's avatar Yinghai Lu Committed by Bjorn Helgaas
Browse files

PCI: Enable unassigned resource reallocation on per-bus basis 



pci_realloc_detect() turns on automatic resource allocation when it finds
unassigned SR-IOV resources.  Previously it did this on a global basis, so
we enabled reallocation if any PCI device anywhere had an unassigned SR-IOV
resource.

This patch changes pci_realloc_detect() so it looks at a single bus, so we
can do this when a host bridge is hot-added.

[bhelgaas: changelog]
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent fa216bf4

drivers/pci/setup-bus.c

+23 −19
Original line number Diff line number Diff line
@@ -1354,9 +1354,9 @@ void __init pci_realloc_get_opt(char *str) 
	else if (!strncmp(str, "on", 2))

		pci_realloc_enable = user_enabled;

}

static bool __init pci_realloc_enabled(void)

static bool __init pci_realloc_enabled(enum enable_type enable)

{

	return pci_realloc_enable >= user_enabled;

	return enable >= user_enabled;

}



#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
@@ -1383,24 +1383,26 @@ static int __init iov_resources_unassigned(struct pci_dev *dev, void *data) 
	return 0;

}



static void  __init pci_realloc_detect(void)

static enum enable_type __init pci_realloc_detect(struct pci_bus *bus,

			 enum enable_type enable_local)

{

	bool unassigned = false;

	struct pci_bus *bus;



	if (pci_realloc_enable != undefined)

		return;

	if (enable_local != undefined)

		return enable_local;



	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;

		}

	}

	if (unassigned)

		return auto_enabled;



	return enable_local;

}

#else

static void __init pci_realloc_detect(void) { }

static enum enable_type __init pci_realloc_detect(struct pci_bus *bus,

			 enum enable_type enable_local)

{

	return enable_local;

}

#endif



/*
@@ -1422,10 +1424,12 @@ pci_assign_unassigned_resources(void) 
	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |

				  IORESOURCE_PREFETCH;

	int pci_try_num = 1;

	enum enable_type enable_local = pci_realloc_enable;



	list_for_each_entry(bus, &pci_root_buses, node)

		enable_local = pci_realloc_detect(bus, enable_local);



	/* don't realloc if asked to do so */

	pci_realloc_detect();

	if (pci_realloc_enabled()) {

	if (pci_realloc_enabled(enable_local)) {

		int max_depth = pci_get_max_depth();



		pci_try_num = max_depth + 1;
@@ -1457,9 +1461,9 @@ again: 
		goto enable_and_dump;



	if (tried_times >= pci_try_num) {

		if (pci_realloc_enable == undefined)

		if (enable_local == undefined)

			printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n");

		else if (pci_realloc_enable == auto_enabled)

		else if (enable_local == auto_enabled)

			printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");



		free_list(&fail_head);

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