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Received: from mailgw02.mediatek.com ([216.200.240.185]) by casper.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hjJ9o-0004d0-P7; Fri, 05 Jul 2019 08:01:28 +0000 X-UUID: 7c1c13ac422641fa922e06f1d471fa6b-20190704 X-UUID: 7c1c13ac422641fa922e06f1d471fa6b-20190704 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 969946169; Thu, 04 Jul 2019 23:59:43 -0800 Received: from MTKMBS07N2.mediatek.inc (172.21.101.141) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 5 Jul 2019 00:59:41 -0700 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 5 Jul 2019 15:59:39 +0800 Received: from [172.21.84.99] (172.21.84.99) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 5 Jul 2019 15:59:39 +0800 Message-ID: <1562313579.1212.73.camel@mtksdccf07> Subject: Re: [RFC,v3 9/9] media: platform: Add Mediatek ISP P1 shared memory device From: Jungo Lin To: Tomasz Figa Date: Fri, 5 Jul 2019 15:59:39 +0800 In-Reply-To: References: <20190611035344.29814-1-jungo.lin@mediatek.com> <20190611035344.29814-10-jungo.lin@mediatek.com> <20190701072532.GB137710@chromium.org> <1562297618.1212.46.camel@mtksdccf07> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190705_090125_103672_56AFF3A6 X-CRM114-Status: GOOD ( 22.16 ) 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, Sean Cheng =?UTF-8?Q?=28=E9=84=AD=E6=98=87=E5=BC=98=29?= , Mauro Carvalho Chehab , Rynn Wu =?UTF-8?Q?=28=E5=90=B3=E8=82=B2=E6=81=A9=29?= , srv_heupstream , Rob Herring , Ryan Yu =?UTF-8?Q?=28=E4=BD=99=E5=AD=9F=E4=BF=AE=29?= , Frankie Chiu =?UTF-8?Q?=28=E9=82=B1=E6=96=87=E5=87=B1=29?= , Hans Verkuil , Matthias Brugger , Sj Huang , "moderated list:ARM/Mediatek SoC support" , Laurent Pinchart , ddavenport@chromium.org, Frederic Chen =?UTF-8?Q?=28=E9=99=B3=E4=BF=8A=E5=85=83=29?= , "list@263.net:IOMMU DRIVERS , Joerg Roedel ," , Linux Media Mailing List 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 Hi Tomasz: On Fri, 2019-07-05 at 13:22 +0900, Tomasz Figa wrote: > Hi Jungo, > > On Fri, Jul 5, 2019 at 12:33 PM Jungo Lin wrote: > > > > Hi Tomasz, [snip] > > After applying your suggestion in SCP device driver, we could remove > > mtk_cam-smem.h/c. Currently, we use dma_alloc_coherent with SCP device > > to get SCP address. We could touch the buffer with this SCP address in > > SCP processor. > > > > After that, we use dma_map_page_attrs with P1 device which supports > > IOMMU domain to get IOVA address. For this address, we will assign > > it to our ISP HW device to proceed. > > > > Below is the snippet for ISP P1 compose buffer initialization. > > > > ptr = dma_alloc_coherent(p1_dev->cam_dev.smem_dev, > > MAX_COMPOSER_SIZE, &addr, GFP_KERNEL); > > if (!ptr) { > > dev_err(dev, "failed to allocate compose memory\n"); > > return -ENOMEM; > > } > > isp_ctx->scp_mem_pa = addr; > > addr contains a DMA address, not a physical address. Could we call it > scp_mem_dma instead? > > > dev_dbg(dev, "scp addr:%pad\n", &addr); > > > > /* get iova address */ > > addr = dma_map_page_attrs(dev, phys_to_page(addr), 0, > > addr is a DMA address, so phys_to_page() can't be called on it. The > simplest thing here would be to use dma_map_single() with ptr as the > CPU address expected. > We have changed to use ma_map_single() with ptr, but encounter IOMMU error. From the debug log of iommu_dma_map_page[3], we got 0x0000000054800000 instead of expected address: 0x0000000050800000[2]. There is a address offset(0x4000000). If we change to use dma_map_page_attrs with phys_to_page(addr), the address is correct as we expected[2]. Do you have any suggestion on this issue? Do we miss something? [1] [ 1.344786] __dma_alloc_from_coherent: 0x800000 PAGE_SHIFT:12 device_base:0x0000000050000000 dma:0x0000000050800000 virt_base:ffffff8014000000 va:ffffff8014800000 [ 1.346890] mtk-cam 1a000000.camisp: scp addr:0x0000000050800000 va:ffffff8014800000 [ 1.347864] iommu_dma_map_page:0x0000000054800000 offset:0 [ 1.348562] mtk-cam 1a000000.camisp: iova addr:0x00000000fde00000 [2] [ 1.346738] __dma_alloc_from_coherent: 0x800000 PAGE_SHIFT:12 device_base:0x0000000050000000 dma:0x0000000050800000 virt_base:ffffff8014000000 va:ffffff8014800000 [ 1.348841] mtk-cam 1a000000.camisp: scp addr:0x0000000050800000 va:ffffff8014800000 [ 1.349816] iommu_dma_map_page:0x0000000050800000 offset:0 [ 1.350514] mtk-cam 1a000000.camisp: iova addr:0x00000000fde00000 [3] dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, int prot) { phys_addr_t phys = page_to_phys(page); pr_err("iommu_dma_map_page:%pa offset:%lu\n", &phys, offset); return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot, iommu_get_dma_domain(dev)); } [snip] Best regards, Jungo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel