powerpc/powernv: Reserve additional space for IOV BAR, with m64_per_iov supported

M64 aperture size is limited on PHB3.  When the IOV BAR is too big, this
will exceed the limitation and failed to be assigned.

Introduce a different mechanism based on the IOV BAR size:

  - if IOV BAR size is smaller than 64MB, expand to total_pe
  - if IOV BAR size is bigger than 64MB, roundup power2

[bhelgaas: make dev_printk() output more consistent, use PCI_SRIOV_NUM_BARS]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 8716db48e946..415df8509f52 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -182,6 +182,8 @@ struct pci_dn {
         u16     vfs_expanded;           /* number of VFs IOV BAR expanded */
         u16     num_vfs;                /* number of VFs enabled*/
         int     offset;                 /* PE# for the first VF PE */
+#define M64_PER_IOV 4
+        int     m64_per_iov;
 #define IODA_INVALID_M64        (-1)
         int     m64_wins[PCI_SRIOV_NUM_BARS];
 #endif /* CONFIG_PCI_IOV */