On powrnv platform, resource position in M64 implies the PE# the resource
belongs to. In some particular case, adjustment of a resource is necessary to
locate it to a correct position in M64.
This patch introduce a function to shift the 'real' VF BAR address according to
an offset.
Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 30 +++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index b0ac851..e46c5bf 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
+#include <linux/pci_regs.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/string.h>
@@ -544,6 +545,35 @@ static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
return 10;
}
+#ifdef CONFIG_PCI_IOV
+static void pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset)
+{
+ struct pci_dn *pdn = pci_get_pdn(dev);
+ int i;
+ struct resource *res;
+ resource_size_t size;
+
+ if (dev->is_physfn) {
+ for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
+ res = dev->resource + PCI_IOV_RESOURCES + i;
+ if (!res->flags || !res->parent)
+ continue;
+
+ if (!is_mem_pref_64_type(res->flags))
+ continue;
+
+ dev_info(&dev->dev, "PowerNV: Shifting VF BAR %pR to\n", res);
+ size = pci_sriov_resource_size(dev, PCI_IOV_RESOURCES + i);
+ res->start += size*offset;
+
+ dev_info(&dev->dev, " %pR\n", res);
+ pci_update_resource(dev, PCI_IOV_RESOURCES + i);
+ }
+ pdn->vfs -= offset;
+ }
+}
+#endif /* CONFIG_PCI_IOV */
+
#if 0
static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
{
--
1.7.9.5
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