sparc64: Enable PCI IOMMU version 2 API

Enable Version 2 of the PCI IOMMU API needed for advanced features
such as PCI Relaxed Ordering and greater than 2 GB DMA address
space per root complex.

Signed-off-by: Chris Hyser <chris.hyser@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index 61c6f93..c5c819d 100644 (file)
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -30,8 +30,19 @@
 #define DRIVER_NAME    "pci_sun4v"
 #define PFX            DRIVER_NAME ": "
 
-static unsigned long vpci_major = 1;
-static unsigned long vpci_minor = 1;
+static unsigned long vpci_major;
+static unsigned long vpci_minor;
+
+struct vpci_version {
+       unsigned long major;
+       unsigned long minor;
+};
+
+/* Ordered from largest major to lowest */
+static struct vpci_version vpci_versions[] = {
+       { .major = 2, .minor = 0 },
+       { .major = 1, .minor = 1 },
+};
 
 #define PGLIST_NENTS   (PAGE_SIZE / sizeof(u64))
 
@@ -907,22 +918,27 @@ static int pci_sun4v_probe(struct platform_device *op)
        struct device_node *dp;
        struct iommu *iommu;
        u32 devhandle;
-       int i, err;
+       int i, err = -ENODEV;
 
        dp = op->dev.of_node;
 
        if (!hvapi_negotiated++) {
-               err = sun4v_hvapi_register(HV_GRP_PCI,
-                                          vpci_major,
-                                          &vpci_minor);
+               for (i = 0; i < ARRAY_SIZE(vpci_versions); i++) {
+                       vpci_major = vpci_versions[i].major;
+                       vpci_minor = vpci_versions[i].minor;
+
+                       err = sun4v_hvapi_register(HV_GRP_PCI, vpci_major,
+                                                  &vpci_minor);
+                       if (!err)
+                               break;
+               }
 
                if (err) {
-                       printk(KERN_ERR PFX "Could not register hvapi, "
-                              "err=%d\n", err);
+                       pr_err(PFX "Could not register hvapi, err=%d\n", err);
                        return err;
                }
-               printk(KERN_INFO PFX "Registered hvapi major[%lu] minor[%lu]\n",
-                      vpci_major, vpci_minor);
+               pr_info(PFX "Registered hvapi major[%lu] minor[%lu]\n",
+                       vpci_major, vpci_minor);
 
                dma_ops = &sun4v_dma_ops;
        }