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Thu, 22 Aug 2019 16:59:31 +0800 Message-ID: <1566464375.11621.10.camel@mhfsdcap03> Subject: Re: [PATCH v10 09/23] iommu/io-pgtable-arm-v7s: Extend to support PA[33:32] for MediaTek From: Yong Wu To: Robin Murphy Date: Thu, 22 Aug 2019 16:59:35 +0800 In-Reply-To: <22a79977-5074-7af1-97b8-8a3e549b23c1@arm.com> References: <1566395606-7975-1-git-send-email-yong.wu@mediatek.com> <1566395606-7975-10-git-send-email-yong.wu@mediatek.com> <20190821152448.qmoqjh5zznfpdi6n@willie-the-truck> <22a79977-5074-7af1-97b8-8a3e549b23c1@arm.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 77FDD9D92F4B2E27F773B23946AF4889BD952E4F98E058E499F22239F28748B22000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190822_015942_302803_0F41DF56 X-CRM114-Status: GOOD ( 19.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, Nicolas Boichat , cui.zhang@mediatek.com, srv_heupstream@mediatek.com, Tomasz Figa , Joerg Roedel , linux-kernel@vger.kernel.org, Evan Green , chao.hao@mediatek.com, iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, Matthias Brugger , ming-fan.chen@mediatek.com, anan.sun@mediatek.com, Will Deacon , Matthias Kaehlcke , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 2019-08-21 at 16:34 +0100, Robin Murphy wrote: > On 21/08/2019 16:24, Will Deacon wrote: > > On Wed, Aug 21, 2019 at 09:53:12PM +0800, Yong Wu wrote: > >> MediaTek extend the arm v7s descriptor to support up to 34 bits PA where > >> the bit32 and bit33 are encoded in the bit9 and bit4 of the PTE > >> respectively. Meanwhile the iova still is 32bits. > >> > >> Regarding whether the pagetable address could be over 4GB, the mt8183 > >> support it while the previous mt8173 don't, thus keep it as is. > >> > >> Signed-off-by: Yong Wu > >> --- > >> drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++++++++++++------- > >> include/linux/io-pgtable.h | 7 +++---- > >> 2 files changed, 28 insertions(+), 11 deletions(-) > > > > [...] > > > >> @@ -731,7 +747,9 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg, > >> { > >> struct arm_v7s_io_pgtable *data; > >> > >> - if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS) > >> + if (cfg->ias > ARM_V7S_ADDR_BITS || > >> + (cfg->oas > ARM_V7S_ADDR_BITS && > >> + !(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT))) > > > > Please can you instead change arm_v7s_alloc_pgtable() so that it allows an > > ias of up to 34 when the IO_PGTABLE_QUIRK_ARM_MTK_EXT is set? > > You mean oas, right? I believe the hardware *does* actually support a > 32-bit ias as well, but we shouldn't pretend to support that while > __arm_v7s_alloc_table() still only knows how to allocate normal-sized > tables. Yes. The HW double the lvl1 pgtable, thus it supports 33bit iova actually. We may extend ias in the future. > > Robin. > > > > > With that change: > > > > Acked-by: Will Deacon > > > > Will > > > > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel