From ebea34185612c3b96d7d3bbd8b7c2ce6c9f4fe6f Mon Sep 17 00:00:00 2001
From: Mark McLoughlin <markmc@redhat.com>
Date: Fri, 14 Aug 2009 08:31:11 +0100
Subject: [PATCH] Improve PCI host device reset error message

Currently, if we are unable to reset a PCI device we return a fairly
generic 'No PCI reset capability available' error message.

Fix that by returning an error from the individual reset messages and
using that error to construct the higher level error mesage.

* src/pci.c: set errors in pciTryPowerManagementReset() and
  pciTrySecondaryBusReset() on failure; use those error messages
  in pciResetDevice(), or explain that no reset support is available
---
 src/pci.c         | 44 +++++++++++++++++++++++++++++++-------------
 src/qemu_driver.c |  4 ++--
 2 files changed, 33 insertions(+), 15 deletions(-)

diff --git a/src/pci.c b/src/pci.c
index 11b3e8b1da..74f7ef071f 100644
--- a/src/pci.c
+++ b/src/pci.c
@@ -456,15 +456,18 @@ pciTrySecondaryBusReset(virConnectPtr conn, pciDevice *dev)
      * are not in use by the host or other guests.
      */
     if (pciBusContainsOtherDevices(conn, dev)) {
-        VIR_WARN("Other devices on bus with %s, not doing bus reset",
-                 dev->name);
+        pciReportError(conn, VIR_ERR_NO_SUPPORT,
+                       _("Other devices on bus with %s, not doing bus reset"),
+                       dev->name);
         return -1;
     }
 
     /* Find the parent bus */
     parent = pciGetParentDevice(conn, dev);
     if (!parent) {
-        VIR_WARN("Failed to find parent device for %s", dev->name);
+        pciReportError(conn, VIR_ERR_NO_SUPPORT,
+                       _("Failed to find parent device for %s"),
+                       dev->name);
         return -1;
     }
 
@@ -475,7 +478,9 @@ pciTrySecondaryBusReset(virConnectPtr conn, pciDevice *dev)
      * are multiple devices/functions
      */
     if (pciRead(dev, 0, config_space, PCI_CONF_LEN) < 0) {
-        VIR_WARN("Failed to save PCI config space for %s", dev->name);
+        pciReportError(conn, VIR_ERR_NO_SUPPORT,
+                       _("Failed to save PCI config space for %s"),
+                       dev->name);
         goto out;
     }
 
@@ -492,9 +497,12 @@ pciTrySecondaryBusReset(virConnectPtr conn, pciDevice *dev)
 
     usleep(200 * 1000); /* sleep 200ms */
 
-    if (pciWrite(dev, 0, config_space, PCI_CONF_LEN) < 0)
-        VIR_WARN("Failed to restore PCI config space for %s", dev->name);
-
+    if (pciWrite(dev, 0, config_space, PCI_CONF_LEN) < 0) {
+        pciReportError(conn, VIR_ERR_NO_SUPPORT,
+                       _("Failed to restore PCI config space for %s"),
+                       dev->name);
+        goto out;
+    }
     ret = 0;
 out:
     pciFreeDevice(conn, parent);
@@ -516,7 +524,9 @@ pciTryPowerManagementReset(virConnectPtr conn ATTRIBUTE_UNUSED, pciDevice *dev)
 
     /* Save and restore the device's config space. */
     if (pciRead(dev, 0, &config_space[0], PCI_CONF_LEN) < 0) {
-        VIR_WARN("Failed to save PCI config space for %s", dev->name);
+        pciReportError(conn, VIR_ERR_NO_SUPPORT,
+                       _("Failed to save PCI config space for %s"),
+                       dev->name);
         return -1;
     }
 
@@ -533,8 +543,12 @@ pciTryPowerManagementReset(virConnectPtr conn ATTRIBUTE_UNUSED, pciDevice *dev)
 
     usleep(10 * 1000); /* sleep 10ms */
 
-    if (pciWrite(dev, 0, &config_space[0], PCI_CONF_LEN) < 0)
-        VIR_WARN("Failed to restore PCI config space for %s", dev->name);
+    if (pciWrite(dev, 0, &config_space[0], PCI_CONF_LEN) < 0) {
+        pciReportError(conn, VIR_ERR_NO_SUPPORT,
+                       _("Failed to restore PCI config space for %s"),
+                       dev->name);
+        return -1;
+    }
 
     return 0;
 }
@@ -582,10 +596,14 @@ pciResetDevice(virConnectPtr conn, pciDevice *dev)
     if (ret < 0 && dev->bus != 0)
         ret = pciTrySecondaryBusReset(conn, dev);
 
-    if (ret < 0)
+    if (ret < 0) {
+        virErrorPtr err = virGetLastError();
         pciReportError(conn, VIR_ERR_NO_SUPPORT,
-                       _("No PCI reset capability available for %s"),
-                       dev->name);
+                       _("Unable to reset PCI device %s: %s"),
+                       dev->name,
+                       err ? err->message : _("no FLR, PM reset or bus reset available"));
+    }
+
     return ret;
 }
 
diff --git a/src/qemu_driver.c b/src/qemu_driver.c
index ed2f3c42ed..6d1ec06630 100644
--- a/src/qemu_driver.c
+++ b/src/qemu_driver.c
@@ -1465,9 +1465,9 @@ qemuDomainReAttachHostDevices(virConnectPtr conn, virDomainDefPtr def)
             continue;
         }
 
-        if (pciDettachDevice(conn, dev) < 0) {
+        if (pciReAttachDevice(conn, dev) < 0) {
             virErrorPtr err = virGetLastError();
-            VIR_ERROR(_("Failed to reset PCI device: %s\n"),
+            VIR_ERROR(_("Failed to re-attach PCI device: %s\n"),
                       err ? err->message : "");
             virResetError(err);
         }
-- 
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