[libvirt] [RFC PATCH 08/11] nodedev: Introduce udevProcessMediatedDevice
Erik Skultety
eskultet at redhat.com
Wed Mar 29 12:51:18 UTC 2017
Start discovering the mediated devices on the host system and format the
attributes for the child device into the XML. Compared to the parent
device which reports generic information about the abstract mediated
devices types, a child device only reports the type name it has been
instantiated from and the iommu group number, since that's device
specific compared to the rest of the info that can be gathered about
mdevs at the moment.
The resulting mdev child device XML:
<device>
<name>mdev_4b20d080_1b54_4048_85b3_a6a62d165c01</name>
<path>/sys/devices/.../4b20d080-1b54-4048-85b3-a6a62d165c01</path>
<parent>pci_0000_06_00_0</parent>
<driver>
<name>vfio_mdev</name>
</driver>
<capability type='mdev'>
<type id='vendor-supplied-type-id'/>
<iommuGroup number='NUM'/>
<capability/>
<device/>
Signed-off-by: Erik Skultety <eskultet at redhat.com>
---
src/conf/node_device_conf.c | 6 ++-
src/node_device/node_device_udev.c | 87 +++++++++++++++++++++++++++++---------
2 files changed, 71 insertions(+), 22 deletions(-)
diff --git a/src/conf/node_device_conf.c b/src/conf/node_device_conf.c
index 03d7993ab1..1f13484d9b 100644
--- a/src/conf/node_device_conf.c
+++ b/src/conf/node_device_conf.c
@@ -541,9 +541,13 @@ virNodeDeviceDefFormat(const virNodeDeviceDef *def)
case VIR_NODE_DEV_CAP_DRM:
virBufferEscapeString(&buf, "<type>%s</type>\n", virNodeDevDRMTypeToString(data->drm.type));
break;
+ case VIR_NODE_DEV_CAP_MDEV:
+ virBufferEscapeString(&buf, "<type id='%s'/>\n", data->mdev.type);
+ virBufferAsprintf(&buf, "<iommuGroup number='%u'/>\n",
+ data->mdev.iommuGroupNumber);
+ break;
case VIR_NODE_DEV_CAP_FC_HOST:
case VIR_NODE_DEV_CAP_VPORTS:
- case VIR_NODE_DEV_CAP_MDEV:
case VIR_NODE_DEV_CAP_LAST:
break;
}
diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index be031fa5a8..092d9456b2 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -324,9 +324,9 @@ udevTranslatePCIIds(unsigned int vendor,
return 0;
}
-#define MDEV_GET_SYSFS_ATTR(attr, cb, ...) \
+#define MDEV_GET_SYSFS_ATTR(attr_name, dir, cb, ...) \
do { \
- if (virAsprintf(&attrpath, "%s/%s", relpath, #attr) < 0) \
+ if (virAsprintf(&attrpath, "%s/%s", dir, #attr_name) < 0) \
goto cleanup; \
\
if (cb(device, attrpath, __VA_ARGS__) < 0) \
@@ -345,17 +345,6 @@ udevGetMdevCaps(struct udev_device *device,
const char *relpath = NULL; /* diff between @sysfspath and @devpath */
char *tmp = NULL;
-
- /* UDEV doesn't report attributes under subdirectories but can query them
- * if specified as relative paths to the device's base path,
- * e.g. /sys/devices/../0000:00:01.0/ is the device's base path as udev
- * reports it, but we're interested in attributes under
- * /sys/devices/../0000:00:01.0/mdev_supported_types/<type>/. So, let's
- * strip the common part of the path and let udev chew the relative bit.
- */
- devpath = udev_device_get_syspath(device);
- relpath = sysfspath + strlen(devpath);
-
/* When calling from the mdev child device, @sysfspath is a symbolic link
* to the actual mdev type (rather than a physical path), so we need to
* resolve it in order to get the type's name.
@@ -366,14 +355,24 @@ udevGetMdevCaps(struct udev_device *device,
if (VIR_STRDUP(mdev->type, last_component(tmp)) < 0)
goto cleanup;
- MDEV_GET_SYSFS_ATTR(name, udevGetStringSysfsAttr,
- &mdev->name);
- MDEV_GET_SYSFS_ATTR(description, udevGetStringSysfsAttr,
- &mdev->description);
- MDEV_GET_SYSFS_ATTR(device_api, udevGetStringSysfsAttr,
- &mdev->device_api);
- MDEV_GET_SYSFS_ATTR(available_instances, udevGetUintSysfsAttr,
- &mdev->available_instances, 10);
+ /* UDEV doesn't report attributes under subdirectories by default but is
+ * able to query them if the path to the attribute is relative paths to the
+ * device's base path, e.g. /sys/devices/../0000:00:01.0/ is the device's
+ * base path as udev reports it, but we're interested in attributes under
+ * /sys/devices/../0000:00:01.0/mdev_supported_types/<type>/. So, let's
+ * strip the common part of the path and let udev chew the relative bit.
+ */
+ devpath = udev_device_get_syspath(device);
+ relpath = sysfspath + strlen(devpath);
+
+ MDEV_GET_SYSFS_ATTR(name, relpath,
+ udevGetStringSysfsAttr, &mdev->name);
+ MDEV_GET_SYSFS_ATTR(description, relpath,
+ udevGetStringSysfsAttr, &mdev->description);
+ MDEV_GET_SYSFS_ATTR(device_api, relpath,
+ udevGetStringSysfsAttr, &mdev->device_api);
+ MDEV_GET_SYSFS_ATTR(available_instances, relpath,
+ udevGetUintSysfsAttr, &mdev->available_instances, 10);
ret = 0;
cleanup:
@@ -1099,6 +1098,51 @@ udevProcessSCSIGeneric(struct udev_device *dev,
static int
+udevProcessMediatedDevice(struct udev_device *dev,
+ virNodeDeviceDefPtr def)
+{
+ int ret = -1;
+ const char *uuidstr = NULL;
+ int iommugrp = -1;
+ int model = -1;
+ char *path = NULL;
+ virMediatedDevicePtr mdev = NULL;
+ virNodeDevCapMdevPtr data = &def->caps->data.mdev;
+
+ if (virAsprintf(&path, "%s/mdev_type", udev_device_get_syspath(dev)) < 0)
+ goto cleanup;
+
+ if (udevGetMdevCaps(dev, path, data) < 0)
+ goto cleanup;
+
+ if ((model = virMediatedDeviceModelTypeFromString(data->device_api)) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Device API '%s' not supported yet"),
+ data->device_api);
+ goto cleanup;
+ }
+
+ uuidstr = udev_device_get_sysname(dev);
+ if (!(mdev = virMediatedDeviceNew(uuidstr, model)))
+ goto cleanup;
+
+ if ((iommugrp = virMediatedDeviceGetIOMMUGroupNum(mdev)) < 0)
+ goto cleanup;
+
+ if (udevGenerateDeviceName(dev, def, NULL) != 0)
+ goto cleanup;
+
+ data->iommuGroupNumber = iommugrp;
+
+ ret = 0;
+ cleanup:
+ VIR_FREE(path);
+ virMediatedDeviceFree(mdev);
+ return ret;
+
+}
+
+static int
udevGetDeviceNodes(struct udev_device *device,
virNodeDeviceDefPtr def)
{
@@ -1217,6 +1261,7 @@ udevGetDeviceDetails(struct udev_device *device,
case VIR_NODE_DEV_CAP_DRM:
return udevProcessDRMDevice(device, def);
case VIR_NODE_DEV_CAP_MDEV:
+ return udevProcessMediatedDevice(device, def);
case VIR_NODE_DEV_CAP_SYSTEM:
case VIR_NODE_DEV_CAP_FC_HOST:
case VIR_NODE_DEV_CAP_VPORTS:
--
2.12.2
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