From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C898C4363D for ; Thu, 24 Sep 2020 14:09:03 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 970AB221EB for ; Thu, 24 Sep 2020 14:09:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="gq8l0jHF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 970AB221EB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 1E2B386A14; Thu, 24 Sep 2020 14:09:02 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jajaDEzOEhFG; Thu, 24 Sep 2020 14:09:01 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 80A9184D2E; Thu, 24 Sep 2020 14:09:01 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 55941C0889; Thu, 24 Sep 2020 14:09:01 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 37B6CC0051 for ; Thu, 24 Sep 2020 14:08:59 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 2665B85725 for ; Thu, 24 Sep 2020 14:08:59 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4U6dip9zP68G for ; Thu, 24 Sep 2020 14:08:57 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by whitealder.osuosl.org (Postfix) with ESMTPS id D1BDA84FBB for ; Thu, 24 Sep 2020 14:08:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=qUkinNTJpuQCd3BkAo9TSZAt85sai4eMgq79ZDgCZBw=; b=gq8l0jHFt1aWIwETbBNHpPVPdp OKdnESxvWWVLrcziud5ktHgTg/9Mn3HvOuFx9CGeKxEFI/IbBnYvMGsJQhU1+BWisXxoqXVoSk/DK hNDVzwemAFx03j6BanGOiYWfpwhnsTBXY+5Iu0ISqQp6k9C2T6QPqhWKVbPVqZ3ynVpNf1ezzR7fP z1GWb/J5xVYDmwChPyIsz9jZShi8RAigATbgZh7H4OiYxCYf4KZ8Qh0zurvIGl/NiDSWEUliFfmIP HRSVFiuOBkzg7PV1YtlTtxBVGwnxqz/bV3pz/BCSmxpM6oFWkt5r8/6lvHdjNSn2K775gdplxvFFV 7HyQ1Lxg==; Received: from 54-240-197-236.amazon.com ([54.240.197.236] helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kLRvQ-0002zZ-B7; Thu, 24 Sep 2020 14:08:44 +0000 Message-ID: <549928db2de6532117f36c9c810373c14cf76f51.camel@infradead.org> Subject: [PATCH] iommu/vt-d: gracefully handle DMAR units with no supported address widths From: David Woodhouse To: Joerg Roedel Date: Thu, 24 Sep 2020 15:08:42 +0100 X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Cc: iommu X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============8162715939987933589==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============8162715939987933589== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-/OIm2ioxsVwGHUNdEQ+l" --=-/OIm2ioxsVwGHUNdEQ+l Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse Instead of bailing out completely, such a unit can still be used for interrupt remapping. Signed-off-by: David Woodhouse --- drivers/iommu/intel/dmar.c | 46 +++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index 93e6345f3414..4420a759f095 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -1024,8 +1024,8 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) { struct intel_iommu *iommu; u32 ver, sts; - int agaw =3D 0; - int msagaw =3D 0; + int agaw =3D -1; + int msagaw =3D -1; int err; =20 if (!drhd->reg_base_addr) { @@ -1050,17 +1050,28 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) } =20 err =3D -EINVAL; - agaw =3D iommu_calculate_agaw(iommu); - if (agaw < 0) { - pr_err("Cannot get a valid agaw for iommu (seq_id =3D %d)\n", - iommu->seq_id); - goto err_unmap; - } - msagaw =3D iommu_calculate_max_sagaw(iommu); - if (msagaw < 0) { - pr_err("Cannot get a valid max agaw for iommu (seq_id =3D %d)\n", - iommu->seq_id); - goto err_unmap; + if (cap_sagaw(iommu->cap) =3D=3D 0) { + pr_info("%s: No supported address widths. Not attempting DMA translation= .\n", + iommu->name); + drhd->ignored =3D 1; + } + + if (!drhd->ignored) { + agaw =3D iommu_calculate_agaw(iommu); + if (agaw < 0) { + pr_err("Cannot get a valid agaw for iommu (seq_id =3D %d)\n", + iommu->seq_id); + drhd->ignored =3D 1; + } + } + if (!drhd->ignored) { + msagaw =3D iommu_calculate_max_sagaw(iommu); + if (msagaw < 0) { + pr_err("Cannot get a valid max agaw for iommu (seq_id =3D %d)\n", + iommu->seq_id); + drhd->ignored =3D 1; + agaw =3D -1; + } } iommu->agaw =3D agaw; iommu->msagaw =3D msagaw; @@ -1087,7 +1098,12 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) =20 raw_spin_lock_init(&iommu->register_lock); =20 - if (intel_iommu_enabled) { + /* + * This is only for hotplug; at boot time intel_iommu_enabled won't + * be set yet. When intel_iommu_init() runs, it registers the units + * present at boot time, then sets intel_iommu_enabled. + */ + if (intel_iommu_enabled && !drhd->ignored) { err =3D iommu_device_sysfs_add(&iommu->iommu, NULL, intel_iommu_groups, "%s", iommu->name); @@ -1117,7 +1133,7 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) =20 static void free_iommu(struct intel_iommu *iommu) { - if (intel_iommu_enabled) { + if (intel_iommu_enabled && iommu->iommu.ops) { iommu_device_unregister(&iommu->iommu); iommu_device_sysfs_remove(&iommu->iommu); } --=20 2.17.1 --=-/OIm2ioxsVwGHUNdEQ+l Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG 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