[Xen-devel] [PATCH 1 of 7] pcifront: translate physical into virtual addresses

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Qemu understands physical pci addresses while pciback expects virtual
pci addresses: this patch adds a translation function in pcifront to
make the conversion.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

---

diff -r 77ccebcefbf8 extras/mini-os/pcifront.c
--- a/extras/mini-os/pcifront.c Wed Jul 22 15:49:24 2009 +0100
+++ b/extras/mini-os/pcifront.c Wed Jul 22 15:53:29 2009 +0100
@@ -189,10 +189,10 @@
     n = xenbus_read_integer(path);
 
     for (i = 0; i < n; i++) {
-        snprintf(path, sizeof(path), "%s/vdev-%d", dev->backend, i);
+        snprintf(path, sizeof(path), "%s/dev-%d", dev->backend, i);
         msg = xenbus_read(XBT_NIL, path, &s);
         if (msg) {
-            printk("Error %s when reading the PCI root name at %s\n", path);
+            printk("Error %s when reading the PCI root name at %s\n", msg, 
path);
             continue;
         }
 
@@ -258,6 +258,55 @@
     free_pcifront(dev);
 }
 
+int pcifront_physical_to_virtual (struct pcifront_dev *dev,
+                                  unsigned int *dom,
+                                  unsigned int *bus,
+                                  unsigned int *slot,
+                                  unsigned long *fun)
+{
+    char path[strlen(dev->backend) + 1 + 5 + 10 + 1];
+    int i, n;
+    char *s, *msg = NULL;
+    unsigned int dom1, bus1, slot1, fun1;
+
+    snprintf(path, sizeof(path), "%s/num_devs", dev->backend);
+    n = xenbus_read_integer(path);
+
+    for (i = 0; i < n; i++) {
+        snprintf(path, sizeof(path), "%s/dev-%d", dev->backend, i);
+        msg = xenbus_read(XBT_NIL, path, &s);
+        if (msg) {
+            printk("Error %s when reading the PCI root name at %s\n", msg, 
path);
+            continue;
+        }
+
+        if (sscanf(s, "%x:%x:%x.%x", &dom1, &bus1, &slot1, &fun1) != 4) {
+            printk("\"%s\" does not look like a PCI device address\n", s);
+            free(s);
+            continue;
+        }
+        free(s);
+
+        if (dom1 == *dom && bus1 == *bus && slot1 == *slot && fun1 == *fun) {
+            snprintf(path, sizeof(path), "%s/vdev-%d", dev->backend, i);
+            msg = xenbus_read(XBT_NIL, path, &s);
+            if (msg) {
+                printk("Error %s when reading the PCI root name at %s\n", msg, 
path);
+                continue;
+            }
+
+            if (sscanf(s, "%x:%x:%x.%x", dom, bus, slot, fun) != 4) {
+                printk("\"%s\" does not look like a PCI device address\n", s);
+                free(s);
+                continue;
+            }
+            free(s);
+
+            return 0;
+        }
+    }
+    return -1;
+}
 
 void pcifront_op(struct pcifront_dev *dev, struct xen_pci_op *op)
 {
@@ -281,6 +330,8 @@
 {
     struct xen_pci_op op;
 
+    if (pcifront_physical_to_virtual(dev, &dom, &bus, &slot, &fun) < 0)
+        return XEN_PCI_ERR_dev_not_found;
     memset(&op, 0, sizeof(op));
 
     op.cmd = XEN_PCI_OP_conf_read;
@@ -307,6 +358,8 @@
 {
     struct xen_pci_op op;
 
+    if (pcifront_physical_to_virtual(dev, &dom, &bus, &slot, &fun) < 0)
+        return XEN_PCI_ERR_dev_not_found;
     memset(&op, 0, sizeof(op));
 
     op.cmd = XEN_PCI_OP_conf_write;
@@ -329,6 +382,8 @@
 {
     struct xen_pci_op op;
 
+    if (pcifront_physical_to_virtual(dev, &dom, &bus, &slot, &fun) < 0)
+        return XEN_PCI_ERR_dev_not_found;
     memset(&op, 0, sizeof(op));
 
     op.cmd = XEN_PCI_OP_enable_msi;
@@ -350,6 +405,8 @@
 {
     struct xen_pci_op op;
 
+    if (pcifront_physical_to_virtual(dev, &dom, &bus, &slot, &fun) < 0)
+        return XEN_PCI_ERR_dev_not_found;
     memset(&op, 0, sizeof(op));
 
     op.cmd = XEN_PCI_OP_disable_msi;
@@ -369,6 +426,8 @@
 {
     struct xen_pci_op op;
 
+    if (pcifront_physical_to_virtual(dev, &dom, &bus, &slot, &fun) < 0)
+        return XEN_PCI_ERR_dev_not_found;
     if (n > SH_INFO_MAX_VEC)
         return XEN_PCI_ERR_op_failed;
 
@@ -399,6 +458,8 @@
 {
     struct xen_pci_op op;
 
+    if (pcifront_physical_to_virtual(dev, &dom, &bus, &slot, &fun) < 0)
+        return XEN_PCI_ERR_dev_not_found;
     memset(&op, 0, sizeof(op));
 
     op.cmd = XEN_PCI_OP_disable_msix;

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