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Wysocki" , linux-mm@kvack.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Christoph Hellwig Subject: Re: [PATCH v3 13/13] dma: arm64: Add CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC and enable it for arm64 Message-ID: References: <20221106220143.2129263-1-catalin.marinas@arm.com> <20221106220143.2129263-14-catalin.marinas@arm.com> <6e846f75-b330-9523-4356-41d5f9e48f12@arm.com> <20221108100331.GA31944@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221108100331.GA31944@lst.de> ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=KElmZvHJ; spf=pass (imf22.hostedemail.com: domain of isaacmanjarres@google.com designates 209.85.210.174 as permitted sender) smtp.mailfrom=isaacmanjarres@google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669834106; a=rsa-sha256; cv=none; b=iIKTmLSCtLY0Fkulq+jveMqgIW9QAGr6TfMw9m5BDvfQD0zC2bpvwZKDEwrz1O7nleII+7 nkCtrTndpdZ3V+aGUU7k46H1cYg+NCi9qVmGaqZcHg6srnm+Sp4NUFuDi2hTuvostx2EpL f8xisntq8U2zNPSyx2SynbqxvHaVnCE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669834106; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=LQkRh/zM8UmfkMC06DRorx1Y0k2ZsCD/+Fu4/2OaKKc=; b=I2pK0wl6L53Vf5h+nMyY0+hQ3pyfJzLmLFkXFheOHQZJNw0UDla7QawVa6iUyAuhGdxqSi yM4v+SnIKfbB3CC4aQJjvPywMprujhHRebaRef90Xspzeo1rLeAwdy+YuzgKJ65QOP0YUm 4e7dfNZyuf4sJLXrvy6nn/DPhbJCKy4= X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6D1F7C001A Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=KElmZvHJ; spf=pass (imf22.hostedemail.com: domain of isaacmanjarres@google.com designates 209.85.210.174 as permitted sender) smtp.mailfrom=isaacmanjarres@google.com; dmarc=pass (policy=reject) header.from=google.com X-Stat-Signature: e1gbup8etrrxpuxofkohi5jn4pdyo1qw X-HE-Tag: 1669834106-391892 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Nov 08, 2022 at 11:03:31AM +0100, Christoph Hellwig wrote: > On Tue, Nov 08, 2022 at 09:52:15AM +0000, Catalin Marinas wrote: > > Since it's hard to guess the optimal swiotlb buffer for such platforms, > > I think a follow-up step would be to use the DMA coherent pool for > > bouncing if no swiotlb buffer is available. At least the pool can grow > > dynamically. Yet another option would be to increase the swiotlb buffer > > at run-time but it has an overhead for is_swiotlb_buffer(). > > Alex said he wanted to look into growing the swiotlb buffer on demand > for other reason, so adding him to Cc to check if there has been any > progress on that. Hi Alex, Did you get a chance to look into this? If so, have you been able to make progress on being able to grow the SWIOTLB buffer on demand? Thanks, Isaac