[PATCH v13 2/3] pci: add wrapper for parse_pci.

[Venu Busireddy <venu.busireddy@oracle.com>]

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

For sbdf's parsing in RMRR command line, add parse_pci_seg with additional
parameter def_seg. parse_pci_seg 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>
Signed-off-by: Venu Busireddy <venu.busireddy@oracle.com>
---
 xen/drivers/pci/pci.c | 11 +++++++++++
 xen/include/xen/pci.h |  3 +++
 2 files changed, 14 insertions(+)

 v13:
   - Renamed __parse_pci() to parse_pci_seg() as suggested by Konrad Wilk.

diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c
index ca07ed0..13d3309 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 def_seg;
+
+    return parse_pci_seg(s, seg_p, bus_p, dev_p, func_p, &def_seg);
+}
+
+const char *__init parse_pci_seg(const char *s, unsigned int *seg_p,
+                                 unsigned int *bus_p, unsigned int *dev_p,
+                                 unsigned int *func_p, bool *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 = false;
     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 = true;
     }
     if ( func_p )
     {
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 0872401..59b6e8a 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -159,6 +159,9 @@ 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_seg(const char *, unsigned int *seg, unsigned int *bus,
+                          unsigned int *dev, unsigned int *func, bool *def_seg);
+
 
 bool_t pcie_aer_get_firmware_first(const struct pci_dev *);
 

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