From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: [PATCH 1/2] iommu/vt-d: Report domain usage in sysfs Date: Tue, 14 Jul 2015 15:24:53 -0600 Message-ID: <20150714212448.11515.38240.stgit@gimli.home> References: <20150714211624.11515.25204.stgit@gimli.home> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150714211624.11515.25204.stgit-GCcqpEzw8uZBDLzU/O5InQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: iommu@lists.linux-foundation.org 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 --- 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, };