[Xen-devel] [PATCH v3 03/13] pci: introduce a pci_sbdf_t field to pci_dev

[Roger Pau Monne <roger.pau@citrix.com>]

And use an union with the current seg, bus and devfn fields to make
fields point to the same underlying data.

No functional change.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
Changes since v2:
 - Constify the union instead of each individual field.
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wl@xen.org>
---
 xen/drivers/vpci/header.c |  7 ++-----
 xen/include/xen/pci.h     | 12 +++++++++---
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c
index 94094f5579..258b91deed 100644
--- a/xen/drivers/vpci/header.c
+++ b/xen/drivers/vpci/header.c
@@ -461,9 +461,6 @@ static int init_bars(struct pci_dev *pdev)
     unsigned int i, num_bars, rom_reg;
     struct vpci_header *header = &pdev->vpci->header;
     struct vpci_bar *bars = header->bars;
-    pci_sbdf_t sbdf = {
-        .sbdf = PCI_SBDF3(pdev->seg, pdev->bus, pdev->devfn),
-    };
     int rc;
 
     switch ( pci_conf_read8(pdev->seg, pdev->bus, slot, func, PCI_HEADER_TYPE)
@@ -530,7 +527,7 @@ static int init_bars(struct pci_dev *pdev)
         else
             bars[i].type = VPCI_BAR_MEM32;
 
-        rc = pci_size_mem_bar(sbdf, reg, &addr, &size,
+        rc = pci_size_mem_bar(pdev->sbdf, reg, &addr, &size,
                               (i == num_bars - 1) ? PCI_BAR_LAST : 0);
         if ( rc < 0 )
         {
@@ -560,7 +557,7 @@ static int init_bars(struct pci_dev *pdev)
     }
 
     /* Check expansion ROM. */
-    rc = pci_size_mem_bar(sbdf, rom_reg, &addr, &size, PCI_BAR_ROM);
+    rc = pci_size_mem_bar(pdev->sbdf, rom_reg, &addr, &size, PCI_BAR_ROM);
     if ( rc > 0 && size )
     {
         struct vpci_bar *rom = &header->bars[num_bars];
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index c61fd7e262..b03927cd28 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -81,9 +81,15 @@ struct pci_dev {
     struct arch_msix *msix;
 
     struct domain *domain;
-    const u16 seg;
-    const u8 bus;
-    const u8 devfn;
+
+    const union {
+        struct {
+            uint8_t devfn;
+            uint8_t bus;
+            uint16_t seg;
+        };
+        pci_sbdf_t sbdf;
+    };
 
     u8 phantom_stride;
 
-- 
2.20.1 (Apple Git-117)


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