From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753662AbbGNVZH (ORCPT ); Tue, 14 Jul 2015 17:25:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57687 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753601AbbGNVZF (ORCPT ); Tue, 14 Jul 2015 17:25:05 -0400 Subject: [PATCH 2/2] iommu/vt-d: Report superpage support in sysfs From: Alex Williamson To: iommu@lists.linux-foundation.org Cc: joro@8bytes.org, dwmw2@infradead.org, linux-kernel@vger.kernel.org Date: Tue, 14 Jul 2015 15:25:04 -0600 Message-ID: <20150714212459.11515.71211.stgit@gimli.home> In-Reply-To: <20150714211624.11515.25204.stgit@gimli.home> References: <20150714211624.11515.25204.stgit@gimli.home> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We already have the VT-d capability register printed raw, but it typically involves a trip to the code or the spec to figure out whether superpages are supported. Make this easier with "2M_pages" and "1G_pages" sysfs entries that clearly report Y/N. Signed-off-by: Alex Williamson --- drivers/iommu/intel-iommu.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 560afc0..eb6e3f4 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -4468,6 +4468,26 @@ static ssize_t intel_iommu_show_ndoms_used(struct device *dev, } static DEVICE_ATTR(domains_used, S_IRUGO, intel_iommu_show_ndoms_used, NULL); +static ssize_t intel_iommu_show_2M_pages(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct intel_iommu *iommu = dev_get_drvdata(dev); + return sprintf(buf, "%c\n", cap_super_page_val(iommu->cap) & 1 ? + 'Y' : 'N'); +} +static DEVICE_ATTR(2M_pages, S_IRUGO, intel_iommu_show_2M_pages, NULL); + +static ssize_t intel_iommu_show_1G_pages(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct intel_iommu *iommu = dev_get_drvdata(dev); + return sprintf(buf, "%c\n", cap_super_page_val(iommu->cap) & 2 ? + 'Y' : 'N'); +} +static DEVICE_ATTR(1G_pages, S_IRUGO, intel_iommu_show_1G_pages, NULL); + static struct attribute *intel_iommu_attrs[] = { &dev_attr_version.attr, &dev_attr_address.attr, @@ -4475,6 +4495,8 @@ static struct attribute *intel_iommu_attrs[] = { &dev_attr_ecap.attr, &dev_attr_domains_supported.attr, &dev_attr_domains_used.attr, + &dev_attr_2M_pages.attr, + &dev_attr_1G_pages.attr, NULL, };