Commit 2238c082 authored by Alex Williamson's avatar Alex Williamson Committed by Joerg Roedel
Browse files

iommu/vt-d: Report domain usage in sysfs 



Debugging domain ID leakage typically requires long running tests in
order to exhaust the domain ID space or kernel instrumentation to
track the setting and clearing of bits.  A couple trivial intel-iommu
specific sysfs extensions make it much easier to expose the IOMMU
capabilities and current usage.

Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 50690762

drivers/iommu/intel-iommu.c

+21 −0
Original line number Diff line number Diff line
@@ -4449,11 +4449,32 @@ static ssize_t intel_iommu_show_ecap(struct device *dev, 
}

static DEVICE_ATTR(ecap, S_IRUGO, intel_iommu_show_ecap, NULL);



static ssize_t intel_iommu_show_ndoms(struct device *dev,

				      struct device_attribute *attr,

				      char *buf)

{

	struct intel_iommu *iommu = dev_get_drvdata(dev);

	return sprintf(buf, "%ld\n", cap_ndoms(iommu->cap));

}

static DEVICE_ATTR(domains_supported, S_IRUGO, intel_iommu_show_ndoms, NULL);



static ssize_t intel_iommu_show_ndoms_used(struct device *dev,

					   struct device_attribute *attr,

					   char *buf)

{

	struct intel_iommu *iommu = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", bitmap_weight(iommu->domain_ids,

						  cap_ndoms(iommu->cap)));

}

static DEVICE_ATTR(domains_used, S_IRUGO, intel_iommu_show_ndoms_used, NULL);



static struct attribute *intel_iommu_attrs[] = {

	&dev_attr_version.attr,

	&dev_attr_address.attr,

	&dev_attr_cap.attr,

	&dev_attr_ecap.attr,

	&dev_attr_domains_supported.attr,

	&dev_attr_domains_used.attr,

	NULL,

};