[PATCH v9 3/4] pci: add wrapper for parse_pci

[elena.ufimtseva@oracle.com]

From: Elena Ufimtseva <elena.ufimtseva@oracle.com>

For sbdf's parsing in RMRR command line add __parse_pci with additional
parameter def_seg. __parse_pci will help to identify if segment was
found in string being parsed or default segment was used.
Make a wrapper parse_pci so the rest of the callers are not affected.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
 xen/drivers/pci/pci.c | 11 +++++++++++
 xen/include/xen/pci.h |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c
index ca07ed0..788a356 100644
--- a/xen/drivers/pci/pci.c
+++ b/xen/drivers/pci/pci.c
@@ -119,11 +119,21 @@ const char *__init parse_pci(const char *s, unsigned int *seg_p,
                              unsigned int *bus_p, unsigned int *dev_p,
                              unsigned int *func_p)
 {
+    bool_t def_seg;
+
+    return __parse_pci(s, seg_p, bus_p, dev_p, func_p, &def_seg);
+}
+
+const char *__init __parse_pci(const char *s, unsigned int *seg_p,
+                             unsigned int *bus_p, unsigned int *dev_p,
+                             unsigned int *func_p, bool_t *def_seg)
+{
     unsigned long seg = simple_strtoul(s, &s, 16), bus, dev, func;
 
     if ( *s != ':' )
         return NULL;
     bus = simple_strtoul(s + 1, &s, 16);
+    *def_seg = 0;
     if ( *s == ':' )
         dev = simple_strtoul(s + 1, &s, 16);
     else
@@ -131,6 +141,7 @@ const char *__init parse_pci(const char *s, unsigned int *seg_p,
         dev = bus;
         bus = seg;
         seg = 0;
+        *def_seg = 1;
     }
     if ( func_p )
     {
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 414106a..d66ecab 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -150,6 +150,9 @@ int pci_find_ext_capability(int seg, int bus, int devfn, int cap);
 int pci_find_next_ext_capability(int seg, int bus, int devfn, int pos, int cap);
 const char *parse_pci(const char *, unsigned int *seg, unsigned int *bus,
                       unsigned int *dev, unsigned int *func);
+const char *__parse_pci(const char *, unsigned int *seg, unsigned int *bus,
+                      unsigned int *dev, unsigned int *func, bool_t *def_seg);
+
 
 bool_t pcie_aer_get_firmware_first(const struct pci_dev *);
 
-- 
2.1.3