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Thu, 5 Aug 2021 07:19:24 +0000 (GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20210805071924eusmtrp1e4e99d7311dc146e8a5bae4acc71e651~YV-KLGEfc2998329983eusmtrp1O; Thu, 5 Aug 2021 07:19:24 +0000 (GMT) X-AuditID: cbfec7f2-7bdff7000002b2bc-d5-610b90fcee54 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id 3B.1C.31287.CF09B016; Thu, 5 Aug 2021 08:19:24 +0100 (BST) Received: from [106.210.134.192] (unknown [106.210.134.192]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20210805071923eusmtip1b3097c7ead5eab6b5a77cf55f5543858~YV-JZggAN2899728997eusmtip1o; Thu, 5 Aug 2021 07:19:23 +0000 (GMT) Subject: Re: [PATCH v3 05/25] iommu/exynos: Drop IOVA cookie management To: Robin Murphy , joro@8bytes.org, will@kernel.org Cc: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, suravee.suthikulpanit@amd.com, baolu.lu@linux.intel.com, john.garry@huawei.com, dianders@chromium.org, rajatja@google.com, chenxiang66@hisilicon.com From: Marek Szyprowski Message-ID: <28ba8847-b441-2937-7f9e-8b117abb6295@samsung.com> Date: Thu, 5 Aug 2021 09:19:23 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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charset="utf-8" X-RootMTR: 20210804171621eucas1p2753f1185eb87c4a137e99e1ac2cc10d3 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20210804171621eucas1p2753f1185eb87c4a137e99e1ac2cc10d3 References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04.08.2021 19:15, Robin Murphy wrote: > The core code bakes its own cookies now. > > CC: Marek Szyprowski > Signed-off-by: Robin Murphy Acked-by: Marek Szyprowski Tested-by: Marek Szyprowski > --- > > v3: Also remove unneeded include > --- > drivers/iommu/exynos-iommu.c | 19 ++++--------------- > 1 file changed, 4 insertions(+), 15 deletions(-) > > diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c > index d0fbf1d10e18..939ffa768986 100644 > --- a/drivers/iommu/exynos-iommu.c > +++ b/drivers/iommu/exynos-iommu.c > @@ -21,7 +21,6 @@ > #include > #include > #include > -#include > > typedef u32 sysmmu_iova_t; > typedef u32 sysmmu_pte_t; > @@ -735,20 +734,16 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type) > /* Check if correct PTE offsets are initialized */ > BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev); > > + if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED) > + return NULL; > + > domain = kzalloc(sizeof(*domain), GFP_KERNEL); > if (!domain) > return NULL; > > - if (type == IOMMU_DOMAIN_DMA) { > - if (iommu_get_dma_cookie(&domain->domain) != 0) > - goto err_pgtable; > - } else if (type != IOMMU_DOMAIN_UNMANAGED) { > - goto err_pgtable; > - } > - > domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); > if (!domain->pgtable) > - goto err_dma_cookie; > + goto err_pgtable; > > domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); > if (!domain->lv2entcnt) > @@ -779,9 +774,6 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type) > free_pages((unsigned long)domain->lv2entcnt, 1); > err_counter: > free_pages((unsigned long)domain->pgtable, 2); > -err_dma_cookie: > - if (type == IOMMU_DOMAIN_DMA) > - iommu_put_dma_cookie(&domain->domain); > err_pgtable: > kfree(domain); > return NULL; > @@ -809,9 +801,6 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) > > spin_unlock_irqrestore(&domain->lock, flags); > > - if (iommu_domain->type == IOMMU_DOMAIN_DMA) > - iommu_put_dma_cookie(iommu_domain); > - > dma_unmap_single(dma_dev, virt_to_phys(domain->pgtable), LV1TABLE_SIZE, > DMA_TO_DEVICE); > Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland