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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: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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commit
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1 changed files with 30 additions and 16 deletions
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@ -1359,30 +1359,44 @@ static bool __init pci_realloc_enabled(void)
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return pci_realloc_enable >= user_enabled;
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}
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static void __init pci_realloc_detect(void)
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{
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#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
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struct pci_dev *dev = NULL;
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static int __init iov_resources_unassigned(struct pci_dev *dev, void *data)
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{
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int i;
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bool *unassigned = data;
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for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
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struct resource *r = &dev->resource[i];
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/* Not assigned or rejected by kernel? */
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if (r->flags && !r->start) {
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*unassigned = true;
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return 1; /* return early from pci_walk_bus() */
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}
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}
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return 0;
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}
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static void __init pci_realloc_detect(void)
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{
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bool unassigned = false;
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struct pci_bus *bus;
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if (pci_realloc_enable != undefined)
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return;
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for_each_pci_dev(dev) {
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int i;
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for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
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struct resource *r = &dev->resource[i];
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/* Not assigned, or rejected by kernel ? */
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if (r->flags && !r->start) {
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pci_realloc_enable = auto_enabled;
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return;
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}
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list_for_each_entry(bus, &pci_root_buses, node) {
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pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
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if (unassigned) {
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pci_realloc_enable = auto_enabled;
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return;
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}
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}
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#endif
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}
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#else
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static void __init pci_realloc_detect(void) { }
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#endif
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/*
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* first try will not touch pci bridge res
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