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iommu/vt-d: Report domain usage in sysfs

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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: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Alex Williamson 2015-07-14 15:24:53 -06:00 committed by Joerg Roedel
parent 50690762cf
commit 2238c0827a
1 changed files with 21 additions and 0 deletions
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21
drivers/iommu/intel-iommu.c
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@ -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,
};