Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 23 Nov 2020 10:08:16 +0000
From:   Christoph Hellwig <hch@infradead.org>
To:     Lu Baolu <baolu.lu@linux.intel.com>
Cc:     Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Tom Murphy <murphyt7@tcd.ie>,
        David Woodhouse <dwmw2@infradead.org>,
        Christoph Hellwig <hch@infradead.org>,
        Ashok Raj <ashok.raj@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
        Logan Gunthorpe <logang@deltatee.com>
Subject: Re: [PATCH v5 3/7] iommu: Allow the dma-iommu api to use bounce
 buffers
Message-ID: <20201123100816.GA26619@infradead.org>
References: <20201120101719.3172693-1-baolu.lu@linux.intel.com>
 <20201120101719.3172693-4-baolu.lu@linux.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20201120101719.3172693-4-baolu.lu@linux.intel.com>
Precedence: bulk

> +	/*
> +	 * If both the physical buffer start address and size are
> +	 * page aligned, we don't need to use a bounce page.
> +	 */
> +	if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) &&
> +	    iova_offset(iovad, phys | org_size)) {
> +		aligned_size = iova_align(iovad, org_size);
> +		phys = swiotlb_tbl_map_single(dev,
> +				phys_to_dma(dev, io_tlb_start),
> +				phys, org_size, aligned_size, dir, attrs);

swiotlb_tbl_map_single takes one less argument in 5.10-rc now.