From: Alex Williamson Date: Tue, 14 Jul 2015 21:24:53 +0000 (-0600) Subject: iommu/vt-d: Report domain usage in sysfs X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2238c0827a9bfa8d517e3175110ed603fb7b9537;p=linux-beck.git 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: Alex Williamson Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 0be23c589d3b..013cbc200579 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -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, };