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:   Thu, 27 May 2021 15:27:11 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc:     Claire Chang <tientzu@chromium.org>,
        Rob Herring <robh+dt@kernel.org>, mpe@ellerman.id.au,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        boris.ostrovsky@oracle.com, jgross@suse.com,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        benh@kernel.crashing.org, paulus@samba.org,
        "list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
        sstabellini@kernel.org, Robin Murphy <robin.murphy@arm.com>,
        grant.likely@arm.com, xypron.glpk@gmx.de,
        Thierry Reding <treding@nvidia.com>, mingo@kernel.org,
        bauerman@linux.ibm.com, peterz@infradead.org,
        Greg KH <gregkh@linuxfoundation.org>,
        Saravana Kannan <saravanak@google.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        heikki.krogerus@linux.intel.com,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        linux-devicetree <devicetree@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org,
        Nicolas Boichat <drinkcat@chromium.org>,
        Jim Quinlan <james.quinlan@broadcom.com>,
        Tomasz Figa <tfiga@chromium.org>, bskeggs@redhat.com,
        Bjorn Helgaas <bhelgaas@google.com>, chris@chris-wilson.co.uk,
        Daniel Vetter <daniel@ffwll.ch>, airlied@linux.ie,
        dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
        jani.nikula@linux.intel.com, Jianxiong Gao <jxgao@google.com>,
        joonas.lahtinen@linux.intel.com, linux-pci@vger.kernel.org,
        maarten.lankhorst@linux.intel.com, matthew.auld@intel.com,
        rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com
Subject: Re: [PATCH v7 04/15] swiotlb: Add restricted DMA pool
 initialization
Message-ID: <20210527132711.GC26160@lst.de>
References: <20210518064215.2856977-1-tientzu@chromium.org> <20210518064215.2856977-5-tientzu@chromium.org> <CALiNf2_AWsnGqCnh02ZAGt+B-Ypzs1=-iOG2owm4GZHz2JAc4A@mail.gmail.com> <YKvLDlnns3TWEZ5l@0xbeefdead.lan>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <YKvLDlnns3TWEZ5l@0xbeefdead.lan>
User-Agent: Mutt/1.5.17 (2007-11-01)
Precedence: bulk

On Mon, May 24, 2021 at 11:49:34AM -0400, Konrad Rzeszutek Wilk wrote:
> rmem_swiotlb_setup
> 
> ?
> 
> Which is ARM specific and inside the generic code?

I don't think it is arm specific at all.  It is OF specific, but just
about every platform but x86 uses OF.  And I can think of an ACPI version
of this as well.