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PCI: Look for unassigned resources on per-bus basis

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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: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2013-07-22 14:37:13 -07:00 committed by Bjorn Helgaas
parent 61e83cdde1
commit 223d96fc32
1 changed files with 30 additions and 16 deletions
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46
drivers/pci/setup-bus.c
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@ -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;
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? */
if (r->flags && !r->start) {
*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;
for_each_pci_dev(dev) {
int i;
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
struct resource *r = &dev->resource[i];
/* Not assigned, or rejected by kernel ? */
if (r->flags && !r->start) {
pci_realloc_enable = auto_enabled;
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;
}
}
#endif
}
#else
static void __init pci_realloc_detect(void) { }
#endif
/*
* first try will not touch pci bridge res