PCI: make SRIOV resources optional

From: Yinghai Lu <yinghai@kernel.org>

Allocate resources to SRIOV BARs only after all other required
resource-requests are satisfied. Dont retry if resource allocation for SRIOV
BARs fail.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 1796c6ffe91c..1c19b9f4019a 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -673,6 +673,16 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
                         if (r->parent || (r->flags & mask) != type)
                                 continue;
                         r_size = resource_size(r);
+#ifdef CONFIG_PCI_IOV
+                        /* put SRIOV requested res to the optional list */
+                        if (add_head && i >= PCI_IOV_RESOURCES &&
+                                        i <= PCI_IOV_RESOURCE_END) {
+                                r->end = r->start - 1;
+                                add_to_list(add_head, dev, r, r_size, 1);
+                                children_add_size += r_size;
+                                continue;
+                        }
+#endif
                         /* For bridges size != alignment */
                         align = pci_resource_alignment(dev, r);
                         order = __ffs(align) - 20;