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Date: Tue, 14 Jul 2015 15:24:53 -0600 From: Alex Williamson <alex.williamson@...hat.com> To: iommu@...ts.linux-foundation.org Cc: joro@...tes.org, dwmw2@...radead.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/2] 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 <alex.williamson@...hat.com> --- drivers/iommu/intel-iommu.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 0649b94..560afc0 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, }; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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