From patchwork Thu Jun 13 22:38:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Murphy X-Patchwork-Id: 1115658 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=tcd.ie Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=tcd-ie.20150623.gappssmtp.com header.i=@tcd-ie.20150623.gappssmtp.com header.b="JTF8mvZh"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45PzFN0Cwpz9sBb for ; Fri, 14 Jun 2019 08:39:36 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726655AbfFMWje (ORCPT ); Thu, 13 Jun 2019 18:39:34 -0400 Received: from mail-ed1-f66.google.com ([209.85.208.66]:44647 "EHLO mail-ed1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727191AbfFMWjd (ORCPT ); Thu, 13 Jun 2019 18:39:33 -0400 Received: by mail-ed1-f66.google.com with SMTP id k8so461988edr.11 for ; Thu, 13 Jun 2019 15:39:32 -0700 (PDT) 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=VIfV1OsDOCOIqv6MGdwh5qyRNpWkUFsV6JcVvbdsKMU=; b=JTF8mvZhJ/EJnKSb2g8yYVwCI7gY6AOBJvHEmxI98vcIdBtLCHSGqNBLdR66ae+p3N Gz0InBZJxBwcsA2tjrxO7l/2SbOW9EC/J1NpN0q7ctUvhDyiy6gcYSquuay1uuRjHT0l YMCpGS8YP90uVBR7O2fFjUN4fpSk/Um0odBXe4DqJz7/xdmuiw3TAlj0hxdMDoWq/uEX RG3tSMQSl86NA27lig6IIG+QyQL9PoQFyZu2igpH5UvBqmMPLOASs5VkPg6T4OTwrWrD sx/2LKFbOUyC2/QeLMuD34t20k1dyG1V73h2F+lWe0JPXWsoQ86NzkR4a3bo6x0/xWPW M2Jw== 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=VIfV1OsDOCOIqv6MGdwh5qyRNpWkUFsV6JcVvbdsKMU=; b=PNIQX725dL0yIzrFMxeNwUAEThk4tTp/BcY/db5qtPUBlJyctJC/V87iLWtMuZc9uS zaXeeLzj6V7bAuvmn77kj7gerrNLRIMpkl3STZDCeSy/KCWVqS5K5EIJlxORpImq9umI LAR5tDe2/yPsbMwh7ZEb6e1cmO08kMp5t2qNzOZ6Y/7j8+rIBglQb+xhd3iQbNfhSExu RbDtmZF7MzbX2YKEz0JSqmWhaU9+GN3mATRza/VlE7mPHiEJE9Ntvyqr9oUKN2/42UfL ffE45OufVV+B2tiQQ0vf0l3upFZF6UqVB4iFBXUzmWgbmw6oQ9EjQ1Q3G/blqIIbeLKX GZPg== X-Gm-Message-State: APjAAAXff2USRFjB3KC3jWMLkWyjiD8GNf9VE4aR/uOagcisfXYu0eF4 SaVm0WRoLbQgYZwxmEGkJ8zqgQ== X-Google-Smtp-Source: APXvYqztuOfR2YM2Du1Zdlax7/DpXIkbSCgn46ot/nG+g0htY0BBU7yj7/Fpx5Lf97ZANT/nGWWzUg== X-Received: by 2002:a50:a941:: with SMTP id m1mr99843943edc.157.1560465571973; Thu, 13 Jun 2019 15:39:31 -0700 (PDT) Received: from localhost.localdomain ([2a02:8084:a0:bc00:8042:d435:a754:1f22]) by smtp.googlemail.com with ESMTPSA id s16sm216522eji.27.2019.06.13.15.39.30 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 13 Jun 2019 15:39:31 -0700 (PDT) From: Tom Murphy To: iommu@lists.linux-foundation.org Cc: Tom Murphy , Joerg Roedel , Will Deacon , Robin Murphy , Marek Szyprowski , Kukjin Kim , Krzysztof Kozlowski , David Woodhouse , Andy Gross , David Brown , Matthias Brugger , Rob Clark , Heiko Stuebner , Gerald Schaefer , Thierry Reding , Jonathan Hunter , Jean-Philippe Brucker , 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 Subject: [PATCH v4 3/5] iommu/dma-iommu: Handle deferred devices Date: Thu, 13 Jun 2019 23:38:58 +0100 Message-Id: <20190613223901.9523-4-murphyt7@tcd.ie> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190613223901.9523-1-murphyt7@tcd.ie> References: <20190613223901.9523-1-murphyt7@tcd.ie> MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org Handle devices which defer their attach to the iommu in the dma-iommu api Signed-off-by: Tom Murphy --- drivers/iommu/dma-iommu.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index e64dbbcde63c..f303bbe20e51 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -22,6 +22,7 @@ #include #include #include +#include struct iommu_dma_msi_page { struct list_head list; @@ -351,6 +352,21 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, return iova_reserve_iommu_regions(dev, domain); } +static int handle_deferred_device(struct device *dev, + struct iommu_domain *domain) +{ + const struct iommu_ops *ops = domain->ops; + + if (!is_kdump_kernel()) + return 0; + + if (unlikely(ops->is_attach_deferred && + ops->is_attach_deferred(domain, dev))) + return iommu_attach_device(domain, dev); + + return 0; +} + /** * dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API * page flags. @@ -462,6 +478,9 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, size_t iova_off = 0; dma_addr_t iova; + if (unlikely(handle_deferred_device(dev, domain))) + return DMA_MAPPING_ERROR; + if (cookie->type == IOMMU_DMA_IOVA_COOKIE) { iova_off = iova_offset(&cookie->iovad, phys); size = iova_align(&cookie->iovad, size + iova_off); @@ -583,6 +602,9 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, *dma_handle = DMA_MAPPING_ERROR; + if (unlikely(handle_deferred_device(dev, domain))) + return NULL; + min_size = alloc_sizes & -alloc_sizes; if (min_size < PAGE_SIZE) { min_size = PAGE_SIZE; @@ -715,7 +737,7 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, int prot = dma_info_to_prot(dir, coherent, attrs); dma_addr_t dma_handle; - dma_handle =__iommu_dma_map(dev, phys, size, prot); + dma_handle = __iommu_dma_map(dev, phys, size, prot); if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && dma_handle != DMA_MAPPING_ERROR) arch_sync_dma_for_device(dev, phys, size, dir); @@ -825,6 +847,9 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, unsigned long mask = dma_get_seg_boundary(dev); int i; + if (unlikely(handle_deferred_device(dev, domain))) + return 0; + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) iommu_dma_sync_sg_for_device(dev, sg, nents, dir);