From patchwork Thu Jan 5 19:04:35 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9499497 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2132760413 for ; Thu, 5 Jan 2017 19:06:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1125328437 for ; Thu, 5 Jan 2017 19:06:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 035702842F; Thu, 5 Jan 2017 19:06:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 98E192842F for ; Thu, 5 Jan 2017 19:06:50 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cPDN9-0002e4-2p; Thu, 05 Jan 2017 19:06:47 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cPDML-0000x8-B0 for linux-arm-kernel@lists.infradead.org; Thu, 05 Jan 2017 19:06:10 +0000 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 024BE61BBE; Thu, 5 Jan 2017 19:05:40 +0000 (UTC) Received: from localhost.redhat.com (vpn1-4-92.ams2.redhat.com [10.36.4.92]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v05J4naI012717; Thu, 5 Jan 2017 14:05:34 -0500 From: Eric Auger To: eric.auger@redhat.com, eric.auger.pro@gmail.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org Subject: [PATCH v6 07/18] iommu: Implement reserved_regions iommu-group sysfs file Date: Thu, 5 Jan 2017 19:04:35 +0000 Message-Id: <1483643086-2883-8-git-send-email-eric.auger@redhat.com> In-Reply-To: <1483643086-2883-1-git-send-email-eric.auger@redhat.com> References: <1483643086-2883-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 05 Jan 2017 19:05:40 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170105_110557_757966_CC0C3D02 X-CRM114-Status: GOOD ( 14.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: drjones@redhat.com, kvm@vger.kernel.org, punit.agrawal@arm.com, linux-kernel@vger.kernel.org, geethasowjanya.akula@gmail.com, diana.craciun@nxp.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, bharat.bhushan@nxp.com, shankerd@codeaurora.org, gpkulkarni@gmail.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP A new iommu-group sysfs attribute file is introduced. It contains the list of reserved regions for the iommu-group. Each reserved region is described on a separate line: - first field is the start IOVA address, - second is the end IOVA address, Signed-off-by: Eric Auger --- v3 -> v4: - add cast to long long int when printing to avoid warning on i386 - change S_IRUGO into 0444 - remove sort. The list is natively sorted now. The file layout is inspired of /sys/bus/pci/devices/BDF/resource. I also read Documentation/filesystems/sysfs.txt so I expect this to be frowned upon. --- drivers/iommu/iommu.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index a2d51b3..15756d8 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -211,8 +211,32 @@ int iommu_get_group_resv_regions(struct iommu_group *group, } EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); +static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, + char *buf) +{ + struct iommu_resv_region *region, *next; + struct list_head group_resv_regions; + char *str = buf; + + INIT_LIST_HEAD(&group_resv_regions); + iommu_get_group_resv_regions(group, &group_resv_regions); + + list_for_each_entry_safe(region, next, &group_resv_regions, list) { + str += sprintf(str, "0x%016llx 0x%016llx\n", + (long long int)region->start, + (long long int)(region->start + + region->length - 1)); + kfree(region); + } + + return (str - buf); +} + static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); +static IOMMU_GROUP_ATTR(reserved_regions, 0444, + iommu_group_show_resv_regions, NULL); + static void iommu_group_release(struct kobject *kobj) { struct iommu_group *group = to_iommu_group(kobj); @@ -227,6 +251,8 @@ static void iommu_group_release(struct kobject *kobj) if (group->default_domain) iommu_domain_free(group->default_domain); + iommu_group_remove_file(group, &iommu_group_attr_reserved_regions); + kfree(group->name); kfree(group); } @@ -290,6 +316,11 @@ struct iommu_group *iommu_group_alloc(void) */ kobject_put(&group->kobj); + ret = iommu_group_create_file(group, + &iommu_group_attr_reserved_regions); + if (ret) + return ERR_PTR(ret); + pr_debug("Allocated group %d\n", group->id); return group;