From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH] iommu/vt-d: Fix the size calculation of pasid table Date: Sun, 30 Oct 2016 06:18:22 -0600 Message-ID: <1477829902.4154.9.camel@infradead.org> References: <1473648551-10025-1-git-send-email-xlpang@redhat.com> <20160919121827.GB3541@8bytes.org> <1476274674.16627.173.camel@infradead.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1548842522557317088==" Return-path: In-Reply-To: <1476274674.16627.173.camel-wEGCiKHe2LqWVfeAwA7xHQ@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: Joerg Roedel , Xunlei Pang Cc: Mika Kuoppala , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: iommu@lists.linux-foundation.org --===============1548842522557317088== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-hk3xPC5NOX2HHRSOpyvU" --=-hk3xPC5NOX2HHRSOpyvU Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2016-10-12 at 13:17 +0100, David Woodhouse wrote: > Yes, that looks correct. I think we may also need to limit it, because > full 20-bit PASID support means we'll attempt an order 11 allocation. > But that's certainly correct for now Actually, not quite correct. You fixed the allocation but not the free. And Mika had reported that even the *correct* allocation was failing because it was too large. So I've done it differently (untested)... ----- Subject: [PATCH] iommu/vt-d: Fix PASID table allocation Somehow I ended up with an off-by-three error in calculating the size of the PASID and PASID State tables, which triggers allocations failures as those tables unfortunately have to be physically contiguous. In fact, even the *correct* maximum size of 8MiB is problematic and is wont to lead to allocation failures. Since I have extracted a promise that this *will* be fixed in hardware, I'm happy to limit it on the current hardware to a maximum of 0x20000 PASIDs, which gives us 1MiB tables =E2=80=94 still not ideal, but better than before. Reported by Mika Kuoppala and also by Xunlei Pang who submitted a simpler patch to fix only the allocation (and not the free) to the "correct" limit... which was still problematic. Signed-off-by: David Woodhouse --- =C2=A0drivers/iommu/intel-svm.c=C2=A0=C2=A0=C2=A0| 28 +++++++++++++++++----= ------- =C2=A0include/linux/intel-iommu.h |=C2=A0=C2=A01 + =C2=A02 files changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index 8ebb353..cb72e00 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -39,10 +39,18 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *io= mmu) =C2=A0 struct page *pages; =C2=A0 int order; =C2=A0 - order =3D ecap_pss(iommu->ecap) + 7 - PAGE_SHIFT; - if (order < 0) - order =3D 0; - + /* Start at 2 because it's defined as 1^(1+PSS) */ + iommu->pasid_max =3D 2 << ecap_pss(iommu->ecap); + + /* Eventually I'm promised we will get a multi-level PASID table + =C2=A0* and it won't have to be physically contiguous. Until then, + =C2=A0* limit the size because 8MiB contiguous allocations can be hard + =C2=A0* to come by. The limit of 0x20000, which is 1MiB for each of + =C2=A0* the PASID and PASID-state tables, is somewhat arbitrary. */ + if (iommu->pasid_max > 0x20000) + iommu->pasid_max =3D 0x20000; + + order =3D get_order(sizeof(struct pasid_entry) * iommu->pasid_max); =C2=A0 pages =3D alloc_pages(GFP_KERNEL | __GFP_ZERO, order); =C2=A0 if (!pages) { =C2=A0 pr_warn("IOMMU: %s: Failed to allocate PASID table\n", @@ -53,6 +61,8 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iomm= u) =C2=A0 pr_info("%s: Allocated order %d PASID table.\n", iommu->name, order)= ; =C2=A0 =C2=A0 if (ecap_dis(iommu->ecap)) { + /* Just making it explicit... */ + BUILD_BUG_ON(sizeof(struct pasid_entry) !=3D sizeof(struct pasid_state_e= ntry)); =C2=A0 pages =3D alloc_pages(GFP_KERNEL | __GFP_ZERO, order); =C2=A0 if (pages) =C2=A0 iommu->pasid_state_table =3D page_address(pages); @@ -68,11 +78,7 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iom= mu) =C2=A0 =C2=A0int intel_svm_free_pasid_tables(struct intel_iommu *iommu) =C2=A0{ - int order; - - order =3D ecap_pss(iommu->ecap) + 7 - PAGE_SHIFT; - if (order < 0) - order =3D 0; + int order =3D get_order(sizeof(struct pasid_entry) * iommu->pasid_max); =C2=A0 =C2=A0 if (iommu->pasid_table) { =C2=A0 free_pages((unsigned long)iommu->pasid_table, order); @@ -371,8 +377,8 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, i= nt flags, struct svm_dev_ =C2=A0 } =C2=A0 svm->iommu =3D iommu; =C2=A0 - if (pasid_max > 2 << ecap_pss(iommu->ecap)) - pasid_max =3D 2 << ecap_pss(iommu->ecap); + if (pasid_max > iommu->pasid_max) + pasid_max =3D iommu->pasid_max; =C2=A0 =C2=A0 /* Do not use PASID 0 in caching mode (virtualised IOMMU) */ =C2=A0 ret =3D idr_alloc(&iommu->pasid_idr, svm, diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 2d9b6500..d49e26c 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -429,6 +429,7 @@ struct intel_iommu { =C2=A0 struct page_req_dsc *prq; =C2=A0 unsigned char prq_name[16];=C2=A0=C2=A0=C2=A0=C2=A0/* Name for PRQ i= nterrupt */ =C2=A0 struct idr pasid_idr; + u32 pasid_max; =C2=A0#endif =C2=A0 struct q_inval=C2=A0=C2=A0*qi;=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* Queued invalidation info */ =C2=A0 u32 *iommu_state; /* Store iommu states between suspend and resume.*= / --=C2=A0 2.5.5 --=20 dwmw2 --=-hk3xPC5NOX2HHRSOpyvU Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEeAw ggXiMIIDyqADAgECAhBrp4p9CteI1lEK+Vnk57ThMA0GCSqGSIb3DQEBCwUAMH0xCzAJBgNVBAYT AklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0 aWZpY2F0ZSBTaWduaW5nMSkwJwYDVQQDEyBTdGFydENvbSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0 eTAeFw0xNTEyMTYwMTAwMDVaFw0zMDEyMTYwMTAwMDVaMHUxCzAJBgNVBAYTAklMMRYwFAYDVQQK 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