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Tue, 30 Jun 2020 02:55:40 -0800 Received: from MTKMBS32DR.mediatek.inc (172.27.6.104) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 30 Jun 2020 03:55:41 -0700 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS32DR.mediatek.inc (172.27.6.104) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 30 Jun 2020 18:55:34 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 30 Jun 2020 18:55:35 +0800 Message-ID: <1593514516.24171.25.camel@mhfsdcap03> Subject: Re: [PATCH v5 06/10] iommu/mediatek: Add sub_comm id in translation fault From: Yong Wu To: Chao Hao Date: Tue, 30 Jun 2020 18:55:16 +0800 In-Reply-To: <20200629071310.1557-7-chao.hao@mediatek.com> References: <20200629071310.1557-1-chao.hao@mediatek.com> <20200629071310.1557-7-chao.hao@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: D7FCA91426CFD155D58B85D54AA5A21697363337348731C64131373A298F8F732000:8 X-MTK: N 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: devicetree@vger.kernel.org, FY Yang , wsd_upstream@mediatek.com, Joerg Roedel , linux-kernel@vger.kernel.org, Evan Green , iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, Matthias Brugger , 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+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 2020-06-29 at 15:13 +0800, Chao Hao wrote: > The max larb number that a iommu HW support is 8(larb0~larb7 in the below > diagram). > If the larb's number is over 8, we use a sub_common for merging > several larbs into one larb. At this case, we will extend larb_id: > bit[11:9] means common-id; > bit[8:7] means subcommon-id; > From these two variables, we could get the real larb number when > translation fault happen. > The diagram is as below: > EMI > | > IOMMU > | > ----------------- > | | > common1 common0 > | | > ----------------- > | > smi common > | > ------------------------------------ > | | | | | | > 3'd0 3'd1 3'd2 3'd3 ... 3'd7 <-common_id(max is 8) > | | | | | | > Larb0 Larb1 | Larb3 ... Larb7 > | > smi sub common > | > -------------------------- > | | | | > 2'd0 2'd1 2'd2 2'd3 <-sub_common_id(max is 4) > | | | | > Larb8 Larb9 Larb10 Larb11 > > In this patch we extend larb_remap[] to larb_remap[8][4] for this. > larb_remap[x][y]: x means common-id above, y means subcommon_id above. > > We can also distinguish if the M4U HW has sub_common by HAS_SUB_COMM > macro. > > Cc: Matthias Brugger > Signed-off-by: Chao Hao > Reviewed-by: Yong Wu > --- > drivers/iommu/mtk_iommu.c | 20 +++++++++++++------- > drivers/iommu/mtk_iommu.h | 3 ++- > include/soc/mediatek/smi.h | 2 ++ > 3 files changed, 17 insertions(+), 8 deletions(-) [snip] > @@ -48,7 +49,7 @@ struct mtk_iommu_plat_data { > enum mtk_iommu_plat m4u_plat; > u32 flags; > u32 inv_sel_reg; > - unsigned char larbid_remap[MTK_LARB_NR_MAX]; > + unsigned char larbid_remap[MTK_LARB_COM_MAX][MTK_LARB_SUBCOM_MAX]; > }; > > struct mtk_iommu_domain; > diff --git a/include/soc/mediatek/smi.h b/include/soc/mediatek/smi.h > index 5a34b87d89e3..fa65a55468e2 100644 > --- a/include/soc/mediatek/smi.h > +++ b/include/soc/mediatek/smi.h > @@ -12,6 +12,8 @@ > #ifdef CONFIG_MTK_SMI > > #define MTK_LARB_NR_MAX 16 > +#define MTK_LARB_COM_MAX 8 > +#define MTK_LARB_SUBCOM_MAX 4 Both are only used in mtk_iommu.h, and I don't think smi has plan to use them. thus we could move them into mtk_iommu.h > > #define MTK_SMI_MMU_EN(port) BIT(port) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel