WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH 3/3] ioemu: use the sysfs interface to enable the PCI

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 3/3] ioemu: use the sysfs interface to enable the PCI ROM
From: Yu Zhao <yu.zhao@xxxxxxxxx>
Date: Sat, 24 Jan 2009 12:47:10 +0800
Cc: Yu Zhao <yu.zhao@xxxxxxxxx>
Delivery-date: Fri, 23 Jan 2009 20:51:56 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1232772430-11079-1-git-send-email-yu.zhao@xxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1232772430-11079-1-git-send-email-yu.zhao@xxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Writing the base address directly to the ROM BAR may cause problem
since the kernel is not aware of the operation.

Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
---
 hw/pass-through.c |   25 +++++++++++++++++++++++--
 1 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/hw/pass-through.c b/hw/pass-through.c
index 207bdf0..e76a3c3 100644
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -1447,6 +1447,27 @@ exit:
     return val;
 }
 
+static int pt_pci_enable_rom(struct pci_dev *dev)
+{
+    FILE *fp;
+    char path[PATH_MAX];
+
+    sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%x/rom",
+            dev->domain, dev->bus, dev->dev, dev->func);
+
+    fp = fopen(path, "w");
+    if ( !fp )
+    {
+        PT_LOG("Can't open %s: %s\n", path, strerror(errno));
+        return -1;
+    }
+
+    fprintf(fp, "1");
+    fclose(fp);
+
+    return 0;
+}
+
 static void pt_libpci_fixup(struct pci_dev *dev)
 {
 #if PCI_LIB_VERSION < 0x030100
@@ -1526,8 +1547,8 @@ static int pt_register_regions(struct pt_dev 
*assigned_device)
 
         /* Re-set BAR reported by OS, otherwise ROM can't be read. */
         if ( (pci_dev->rom_base_addr & PCI_ROM_ADDRESS_MASK) == 0 )
-            pci_write_long(pci_dev, PCI_ROM_ADDRESS,
-                           (pci_dev->rom_base_addr | PCI_ROM_ADDRESS_MASK));
+            if ( pt_pci_enable_rom(pci_dev) )
+                return -1;
 
         assigned_device->bases[PCI_ROM_SLOT].e_physbase =
             pci_dev->rom_base_addr;
-- 
1.5.6.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>