From patchwork Sat Dec 21 15:03:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Murphy X-Patchwork-Id: 11307015 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1ECE3138D for ; Sat, 21 Dec 2019 15:04:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E78CD21D7E for ; Sat, 21 Dec 2019 15:04:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=tcd-ie.20150623.gappssmtp.com header.i=@tcd-ie.20150623.gappssmtp.com header.b="LF2xaqTB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727186AbfLUPEf (ORCPT ); Sat, 21 Dec 2019 10:04:35 -0500 Received: from mail-ed1-f66.google.com ([209.85.208.66]:37312 "EHLO mail-ed1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727361AbfLUPEe (ORCPT ); Sat, 21 Dec 2019 10:04:34 -0500 Received: by mail-ed1-f66.google.com with SMTP id cy15so11401231edb.4 for ; Sat, 21 Dec 2019 07:04:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tcd-ie.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3kw9XOM83Gnbnm5VBWA2//dqKfolDXj7oZ7r7B1xmXk=; b=LF2xaqTBBlPQ7i0KVmncE+goIEe89wuyJqhz7klIJWAT71TTSCk30NViAVT7SqjMw+ 7mDm8B7wD8nu4PWLGnZXpzTlibPXPwnZcaD0bsKB74d0NgcPmlUzaRXKjLR17+gOcimK 8fjIXvrME+nRk1BO7gm1A2LxBEHGbznK81gTHWmTZMMCaBlZyxrmIn7FGdI85YZOwsIG mZw5pwH6nNkr1sXWvObIhq7po60PRXw2xmIt1UG+M5Qvx3peWdtOiYVPQYFu+brgYfWA HDkIR8dxB86cKmJJ7DVe6QZcvYxm/BF8hmbwSr9yCIqznQUjonCUJj32NcQy9vmF1Oq+ PxqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3kw9XOM83Gnbnm5VBWA2//dqKfolDXj7oZ7r7B1xmXk=; b=HALewDS6swpF7tDnFQyn4e7SG4IfgFf8CJQEHosH1rUDPwcgD0TodS27AjFvFALlQU QXEuOSSjhhSU2JT41vftLmvfqE3GHEFYFj0J0DEM+g0hNS+NRCJbF4ou28WRy9Mlnqir wvdLTZVkU0ssa5kHPwan/lTJ9krt3sFv5UVYT7Ue9dN1ujp09+Y3x83XI6ujs1Ua1XN0 wz9dAu0ATkDzFDV8Ai/gX8pacX5o7aukj86k4Ly6vczOTpZfkajGTNMg3bTxxku+IFEa aC2QuMy6AfKOglXSue86ZYF7uiTE7g/2SaRJ6gvP6l3B1phCoWLurLo/VvFPQXX3ygE6 90tQ== X-Gm-Message-State: APjAAAXroH374GswXPPC1pYJcqWqo/bJNwqXE9JHzfbfbWpYJZyKXi9s +pcRrmY1hAK2uA6oxfUQ87FgDQ== X-Google-Smtp-Source: APXvYqyaL08IHL0GcHhm3cVmdCwxRxirUVhP6DZU/+/bnczE7blAGMOLi2oiWq+7pBmE+gO544tPVg== X-Received: by 2002:a17:906:49c4:: with SMTP id w4mr22272847ejv.158.1576940673039; Sat, 21 Dec 2019 07:04:33 -0800 (PST) Received: from localhost.localdomain ([80.233.37.20]) by smtp.googlemail.com with ESMTPSA id u13sm1517639ejz.69.2019.12.21.07.04.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Dec 2019 07:04:32 -0800 (PST) From: Tom Murphy To: iommu@lists.linux-foundation.org Cc: Tom Murphy , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Joerg Roedel , Will Deacon , Robin Murphy , Marek Szyprowski , Kukjin Kim , Krzysztof Kozlowski , David Woodhouse , Lu Baolu , Andy Gross , Bjorn Andersson , Matthias Brugger , Rob Clark , Heiko Stuebner , Gerald Schaefer , Thierry Reding , Jonathan Hunter , Jean-Philippe Brucker , Alex Williamson , Cornelia Huck , Eric Auger , Marc Zyngier , Julien Grall , Thomas Gleixner , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-tegra@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org Subject: [PATCH 3/8] iommu/vt-d: Remove IOVA handling code from non-dma_ops path Date: Sat, 21 Dec 2019 15:03:55 +0000 Message-Id: <20191221150402.13868-4-murphyt7@tcd.ie> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191221150402.13868-1-murphyt7@tcd.ie> References: <20191221150402.13868-1-murphyt7@tcd.ie> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Remove all IOVA handling code from the non-dma_ops path in the intel iommu driver. There's no need for the non-dma_ops path to keep track of IOVAs. The whole point of the non-dma_ops path is that it allows the IOVAs to be handled separately. The IOVA handling code removed in this patch is pointless. Signed-off-by: Tom Murphy --- drivers/iommu/intel-iommu.c | 89 ++++++++++++++----------------------- 1 file changed, 33 insertions(+), 56 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 64b1a9793daa..8d72ea0fb843 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1908,7 +1908,8 @@ static void domain_exit(struct dmar_domain *domain) domain_remove_dev_info(domain); /* destroy iovas */ - put_iova_domain(&domain->iovad); + if (domain->domain.type == IOMMU_DOMAIN_DMA) + put_iova_domain(&domain->iovad); if (domain->pgd) { struct page *freelist; @@ -2671,19 +2672,9 @@ static struct dmar_domain *set_domain_for_dev(struct device *dev, } static int iommu_domain_identity_map(struct dmar_domain *domain, - unsigned long long start, - unsigned long long end) + unsigned long first_vpfn, + unsigned long last_vpfn) { - unsigned long first_vpfn = start >> VTD_PAGE_SHIFT; - unsigned long last_vpfn = end >> VTD_PAGE_SHIFT; - - if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn), - dma_to_mm_pfn(last_vpfn))) { - pr_err("Reserving iova failed\n"); - return -ENOMEM; - } - - pr_debug("Mapping reserved region %llx-%llx\n", start, end); /* * RMRR range might have overlap with physical memory range, * clear it first @@ -2760,7 +2751,8 @@ static int __init si_domain_init(int hw) for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { ret = iommu_domain_identity_map(si_domain, - PFN_PHYS(start_pfn), PFN_PHYS(end_pfn)); + mm_to_dma_pfn(start_pfn), + mm_to_dma_pfn(end_pfn)); if (ret) return ret; } @@ -4593,58 +4585,37 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb, unsigned long val, void *v) { struct memory_notify *mhp = v; - unsigned long long start, end; - unsigned long start_vpfn, last_vpfn; + unsigned long start_vpfn = mm_to_dma_pfn(mhp->start_pfn); + unsigned long last_vpfn = mm_to_dma_pfn(mhp->start_pfn + + mhp->nr_pages - 1); switch (val) { case MEM_GOING_ONLINE: - start = mhp->start_pfn << PAGE_SHIFT; - end = ((mhp->start_pfn + mhp->nr_pages) << PAGE_SHIFT) - 1; - if (iommu_domain_identity_map(si_domain, start, end)) { - pr_warn("Failed to build identity map for [%llx-%llx]\n", - start, end); + if (iommu_domain_identity_map(si_domain, start_vpfn, + last_vpfn)) { + pr_warn("Failed to build identity map for [%lx-%lx]\n", + start_vpfn, last_vpfn); return NOTIFY_BAD; } break; case MEM_OFFLINE: case MEM_CANCEL_ONLINE: - start_vpfn = mm_to_dma_pfn(mhp->start_pfn); - last_vpfn = mm_to_dma_pfn(mhp->start_pfn + mhp->nr_pages - 1); - while (start_vpfn <= last_vpfn) { - struct iova *iova; + { struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; struct page *freelist; - iova = find_iova(&si_domain->iovad, start_vpfn); - if (iova == NULL) { - pr_debug("Failed get IOVA for PFN %lx\n", - start_vpfn); - break; - } - - iova = split_and_remove_iova(&si_domain->iovad, iova, - start_vpfn, last_vpfn); - if (iova == NULL) { - pr_warn("Failed to split IOVA PFN [%lx-%lx]\n", - start_vpfn, last_vpfn); - return NOTIFY_BAD; - } - - freelist = domain_unmap(si_domain, iova->pfn_lo, - iova->pfn_hi); + freelist = domain_unmap(si_domain, start_vpfn, + last_vpfn); rcu_read_lock(); for_each_active_iommu(iommu, drhd) iommu_flush_iotlb_psi(iommu, si_domain, - iova->pfn_lo, iova_size(iova), + start_vpfn, mhp->nr_pages, !freelist, 0); rcu_read_unlock(); dma_free_pagelist(freelist); - - start_vpfn = iova->pfn_hi + 1; - free_iova_mem(iova); } break; } @@ -4672,8 +4643,9 @@ static void free_all_cpu_cached_iovas(unsigned int cpu) for (did = 0; did < cap_ndoms(iommu->cap); did++) { domain = get_iommu_domain(iommu, (u16)did); - if (!domain) + if (!domain || domain->domain.type != IOMMU_DOMAIN_DMA) continue; + free_cpu_cached_iovas(cpu, &domain->iovad); } } @@ -5095,9 +5067,6 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width) { int adjust_width; - init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN); - domain_reserve_special_ranges(domain); - /* calculate AGAW */ domain->gaw = guest_width; adjust_width = guestwidth_to_adjustwidth(guest_width); @@ -5116,6 +5085,18 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width) return 0; } +static void intel_init_iova_domain(struct dmar_domain *dmar_domain) +{ + init_iova_domain(&dmar_domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN); + copy_reserved_iova(&reserved_iova_list, &dmar_domain->iovad); + + if (init_iova_flush_queue(&dmar_domain->iovad, iommu_flush_iova, + iova_entry_free)) { + pr_warn("iova flush queue initialization failed\n"); + intel_iommu_strict = 1; + } +} + static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) { struct dmar_domain *dmar_domain; @@ -5136,12 +5117,8 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) return NULL; } - if (type == IOMMU_DOMAIN_DMA && - init_iova_flush_queue(&dmar_domain->iovad, - iommu_flush_iova, iova_entry_free)) { - pr_warn("iova flush queue initialization failed\n"); - intel_iommu_strict = 1; - } + if (type == IOMMU_DOMAIN_DMA) + intel_init_iova_domain(dmar_domain); domain_update_iommu_cap(dmar_domain);