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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 F3407C432C0 for ; Thu, 21 Nov 2019 21:22:04 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 D03B82068F for ; Thu, 21 Nov 2019 21:22:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D03B82068F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 0BF448842D; Thu, 21 Nov 2019 21:22:03 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id B20Jx9uIRYAe; Thu, 21 Nov 2019 21:22:00 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id B7CD68836C; Thu, 21 Nov 2019 21:22:00 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B36F2C1DD8; Thu, 21 Nov 2019 21:22:00 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 0E820C18DA for ; Thu, 21 Nov 2019 21:21:57 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 0B6718716B for ; Thu, 21 Nov 2019 21:21:57 +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 FoFPuPnIN7Kb for ; Thu, 21 Nov 2019 21:21:56 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 487BD871C6 for ; Thu, 21 Nov 2019 21:21:56 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Nov 2019 13:21:55 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,227,1571727600"; d="scan'208";a="210224385" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga006.jf.intel.com with ESMTP; 21 Nov 2019 13:21:55 -0800 From: Jacob Pan To: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , "Lu Baolu" , David Woodhouse Subject: [PATCH v4 6/8] iommu/vt-d: Replace Intel specific PASID allocator with IOASID Date: Thu, 21 Nov 2019 13:26:26 -0800 Message-Id: <1574371588-65634-7-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1574371588-65634-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1574371588-65634-1-git-send-email-jacob.jun.pan@linux.intel.com> Cc: "Tian, Kevin" , Raj Ashok 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: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Make use of generic IOASID code to manage PASID allocation, free, and lookup. Replace Intel specific code. Signed-off-by: Jacob Pan Reviewed-by: Lu Baolu Reviewed-by: Eric Auger Acked-by: Lu Baolu --- drivers/iommu/Kconfig | 1 + drivers/iommu/intel-iommu.c | 13 +++++++------ drivers/iommu/intel-pasid.c | 36 ------------------------------------ drivers/iommu/intel-svm.c | 39 +++++++++++++++++++++++++-------------- 4 files changed, 33 insertions(+), 56 deletions(-) diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index fd50ddffffbf..43ce450a40d3 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -212,6 +212,7 @@ config INTEL_IOMMU_SVM depends on INTEL_IOMMU && X86 select PCI_PASID select MMU_NOTIFIER + select IOASID help Shared Virtual Memory (SVM) provides a facility for devices to access DMA resources through process address space by diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index d598168e410d..a84f0caa33a0 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5238,7 +5238,7 @@ static void auxiliary_unlink_device(struct dmar_domain *domain, domain->auxd_refcnt--; if (!domain->auxd_refcnt && domain->default_pasid > 0) - intel_pasid_free_id(domain->default_pasid); + ioasid_free(domain->default_pasid); } static int aux_domain_add_dev(struct dmar_domain *domain, @@ -5256,10 +5256,11 @@ static int aux_domain_add_dev(struct dmar_domain *domain, if (domain->default_pasid <= 0) { int pasid; - pasid = intel_pasid_alloc_id(domain, PASID_MIN, - pci_max_pasids(to_pci_dev(dev)), - GFP_KERNEL); - if (pasid <= 0) { + /* No private data needed for the default pasid */ + pasid = ioasid_alloc(NULL, PASID_MIN, + pci_max_pasids(to_pci_dev(dev)) - 1, + NULL); + if (pasid == INVALID_IOASID) { pr_err("Can't allocate default pasid\n"); return -ENODEV; } @@ -5295,7 +5296,7 @@ static int aux_domain_add_dev(struct dmar_domain *domain, spin_unlock(&iommu->lock); spin_unlock_irqrestore(&device_domain_lock, flags); if (!domain->auxd_refcnt && domain->default_pasid > 0) - intel_pasid_free_id(domain->default_pasid); + ioasid_free(domain->default_pasid); return ret; } diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c index 732bfee228df..3cb569e76642 100644 --- a/drivers/iommu/intel-pasid.c +++ b/drivers/iommu/intel-pasid.c @@ -26,42 +26,6 @@ */ static DEFINE_SPINLOCK(pasid_lock); u32 intel_pasid_max_id = PASID_MAX; -static DEFINE_IDR(pasid_idr); - -int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp) -{ - int ret, min, max; - - min = max_t(int, start, PASID_MIN); - max = min_t(int, end, intel_pasid_max_id); - - WARN_ON(in_interrupt()); - idr_preload(gfp); - spin_lock(&pasid_lock); - ret = idr_alloc(&pasid_idr, ptr, min, max, GFP_ATOMIC); - spin_unlock(&pasid_lock); - idr_preload_end(); - - return ret; -} - -void intel_pasid_free_id(int pasid) -{ - spin_lock(&pasid_lock); - idr_remove(&pasid_idr, pasid); - spin_unlock(&pasid_lock); -} - -void *intel_pasid_lookup_id(int pasid) -{ - void *p; - - spin_lock(&pasid_lock); - p = idr_find(&pasid_idr, pasid); - spin_unlock(&pasid_lock); - - return p; -} /* * Per device pasid table management: diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index e90d0b914afe..71b85b892c56 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include "intel-pasid.h" @@ -335,16 +336,15 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ if (pasid_max > intel_pasid_max_id) pasid_max = intel_pasid_max_id; - /* Do not use PASID 0 in caching mode (virtualised IOMMU) */ - ret = intel_pasid_alloc_id(svm, - !!cap_caching_mode(iommu->cap), - pasid_max, GFP_KERNEL); - if (ret < 0) { + /* Do not use PASID 0, reserved for RID to PASID */ + svm->pasid = ioasid_alloc(NULL, PASID_MIN, + pasid_max - 1, svm); + if (svm->pasid == INVALID_IOASID) { kfree(svm); kfree(sdev); + ret = -ENOSPC; goto out; } - svm->pasid = ret; svm->notifier.ops = &intel_mmuops; svm->mm = mm; svm->flags = flags; @@ -354,7 +354,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ if (mm) { ret = mmu_notifier_register(&svm->notifier, mm); if (ret) { - intel_pasid_free_id(svm->pasid); + ioasid_free(svm->pasid); kfree(svm); kfree(sdev); goto out; @@ -370,7 +370,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ if (ret) { if (mm) mmu_notifier_unregister(&svm->notifier, mm); - intel_pasid_free_id(svm->pasid); + ioasid_free(svm->pasid); kfree(svm); kfree(sdev); goto out; @@ -418,7 +418,15 @@ int intel_svm_unbind_mm(struct device *dev, int pasid) if (!iommu) goto out; - svm = intel_pasid_lookup_id(pasid); + svm = ioasid_find(NULL, pasid, NULL); + if (!svm) + goto out; + + if (IS_ERR(svm)) { + ret = PTR_ERR(svm); + goto out; + } + if (!svm) goto out; @@ -440,7 +448,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid) kfree_rcu(sdev, rcu); if (list_empty(&svm->devs)) { - intel_pasid_free_id(svm->pasid); + ioasid_free(svm->pasid); if (svm->mm) mmu_notifier_unregister(&svm->notifier, svm->mm); @@ -475,10 +483,14 @@ int intel_svm_is_pasid_valid(struct device *dev, int pasid) if (!iommu) goto out; - svm = intel_pasid_lookup_id(pasid); + svm = ioasid_find(NULL, pasid, NULL); if (!svm) goto out; + if (IS_ERR(svm)) { + ret = PTR_ERR(svm); + goto out; + } /* init_mm is used in this case */ if (!svm->mm) ret = 1; @@ -585,13 +597,12 @@ static irqreturn_t prq_event_thread(int irq, void *d) if (!svm || svm->pasid != req->pasid) { rcu_read_lock(); - svm = intel_pasid_lookup_id(req->pasid); + svm = ioasid_find(NULL, req->pasid, NULL); /* It *can't* go away, because the driver is not permitted * to unbind the mm while any page faults are outstanding. * So we only need RCU to protect the internal idr code. */ rcu_read_unlock(); - - if (!svm) { + if (IS_ERR_OR_NULL(svm)) { pr_err("%s: Page request for invalid PASID %d: %08llx %08llx\n", iommu->name, req->pasid, ((unsigned long long *)req)[0], ((unsigned long long *)req)[1]); -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu