From: Sam Protsenko <semen.protsenko@linaro.org> To: David Virag <virag.david003@gmail.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com>, Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>, Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>, Janghyuck Kim <janghyuck.kim@samsung.com>, Cho KyongHo <pullip.cho@samsung.com>, Daniel Mentz <danielmentz@google.com>, Sumit Semwal <sumit.semwal@linaro.org>, iommu@lists.linux-foundation.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/4] iommu/exynos: Add basic support for SysMMU v7 Date: Mon, 11 Jul 2022 02:04:31 +0300 [thread overview] Message-ID: <CAPLW+4kU3gLfSRa4cm+374Fh4ooCag7kSk_cwhDe=M8ewMzcbw@mail.gmail.com> (raw) In-Reply-To: <67943ec4dcfe85d6d616a5507437d99f6c5638a2.camel@gmail.com> On Sun, 3 Jul 2022 at 13:47, David Virag <virag.david003@gmail.com> wrote: > > On Sun, 2022-07-03 at 00:48 +0300, Sam Protsenko wrote: > [...] > > Hi Marek, > > > > As I understand, you have some board with SysMMU v7, which is not VM > > capable (judging from the patches you shared earlier). Could you > > please somehow verify if this series works fine for you? For example, > > this testing driver [1] can be helpful. > > > > Thanks! > > > > [1] > > https://github.com/joe-skb7/linux/commit/bbadd46fa525fe1fef2ccbdfff81f7d29caf0506 > > Hi Sam, > > Not Marek here, but I wanted to try this on my jackpotlte (Exynos > 7885). The driver reports it's DPU sysmmu as version 7.2, and manually > reading the capabilities registers it looks like it has the 2nd > capability register but not the VM capability. > > After applying your patches, adding your test driver (with SYSMMU_BASE > corrected to 7885 value), and adding the sysmmu to dt, I tried to cat > the test file that it creates in debugfs and I got an SError kernel > panic. > > I tried tracing where the SError happens and it looks like it's this > line: > /* Preload for emulation */ > iowrite32(rw | vpn, obj->reg_base + MMU_EMU_PRELOAD); > > Trying to read the EMU registers using devmem results in a "Bus error". > > Could these emulation registers be missing from my SysMMU? Do you have > any info on what version should have it? Or maybe some capability bit? > I'll try testing it with DECON/DPP later and see if it works that way. > I don't have any manuals for v7.2, so I can only assume. Yes, it looks to me very much like those EMU registers are missing in your SysMMU IP-core: I remember seeing some similar SError messages while trying to access some incorrect MMIO addresses. Good news is that once this patch series is fixed and accepted, you can *probably* base your work on top of it (as I only validated it with EMU registers for now). I mean you can add some real IP-core users of that IOMMU, like graphics (DPU), audio, camera, etc. Not sure though if it would be enough to just add some DTS nodes, or your SoC support has to be added to some drivers first. > Best regards, > David
WARNING: multiple messages have this Message-ID (diff)
From: Sam Protsenko <semen.protsenko@linaro.org> To: David Virag <virag.david003@gmail.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com>, Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>, Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>, Janghyuck Kim <janghyuck.kim@samsung.com>, Cho KyongHo <pullip.cho@samsung.com>, Daniel Mentz <danielmentz@google.com>, Sumit Semwal <sumit.semwal@linaro.org>, iommu@lists.linux-foundation.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/4] iommu/exynos: Add basic support for SysMMU v7 Date: Mon, 11 Jul 2022 02:04:31 +0300 [thread overview] Message-ID: <CAPLW+4kU3gLfSRa4cm+374Fh4ooCag7kSk_cwhDe=M8ewMzcbw@mail.gmail.com> (raw) In-Reply-To: <67943ec4dcfe85d6d616a5507437d99f6c5638a2.camel@gmail.com> On Sun, 3 Jul 2022 at 13:47, David Virag <virag.david003@gmail.com> wrote: > > On Sun, 2022-07-03 at 00:48 +0300, Sam Protsenko wrote: > [...] > > Hi Marek, > > > > As I understand, you have some board with SysMMU v7, which is not VM > > capable (judging from the patches you shared earlier). Could you > > please somehow verify if this series works fine for you? For example, > > this testing driver [1] can be helpful. > > > > Thanks! > > > > [1] > > https://github.com/joe-skb7/linux/commit/bbadd46fa525fe1fef2ccbdfff81f7d29caf0506 > > Hi Sam, > > Not Marek here, but I wanted to try this on my jackpotlte (Exynos > 7885). The driver reports it's DPU sysmmu as version 7.2, and manually > reading the capabilities registers it looks like it has the 2nd > capability register but not the VM capability. > > After applying your patches, adding your test driver (with SYSMMU_BASE > corrected to 7885 value), and adding the sysmmu to dt, I tried to cat > the test file that it creates in debugfs and I got an SError kernel > panic. > > I tried tracing where the SError happens and it looks like it's this > line: > /* Preload for emulation */ > iowrite32(rw | vpn, obj->reg_base + MMU_EMU_PRELOAD); > > Trying to read the EMU registers using devmem results in a "Bus error". > > Could these emulation registers be missing from my SysMMU? Do you have > any info on what version should have it? Or maybe some capability bit? > I'll try testing it with DECON/DPP later and see if it works that way. > I don't have any manuals for v7.2, so I can only assume. Yes, it looks to me very much like those EMU registers are missing in your SysMMU IP-core: I remember seeing some similar SError messages while trying to access some incorrect MMIO addresses. Good news is that once this patch series is fixed and accepted, you can *probably* base your work on top of it (as I only validated it with EMU registers for now). I mean you can add some real IP-core users of that IOMMU, like graphics (DPU), audio, camera, etc. Not sure though if it would be enough to just add some DTS nodes, or your SoC support has to be added to some drivers first. > Best regards, > David _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-07-10 23:04 UTC|newest] Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-07-02 21:37 [PATCH 0/4] iommu/exynos: Add basic support for SysMMU v7 Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:37 ` [PATCH 1/4] iommu/exynos: Set correct dma mask for SysMMU v5+ Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-03 18:50 ` Krzysztof Kozlowski 2022-07-03 18:50 ` Krzysztof Kozlowski 2022-07-03 18:50 ` Krzysztof Kozlowski 2022-07-08 13:18 ` Sam Protsenko 2022-07-08 13:18 ` Sam Protsenko 2022-07-11 12:27 ` Krzysztof Kozlowski 2022-07-11 12:27 ` Krzysztof Kozlowski 2022-07-11 12:59 ` Robin Murphy 2022-07-11 12:59 ` Robin Murphy 2022-07-02 21:37 ` [PATCH 2/4] iommu/exynos: Check if SysMMU v7 has VM registers Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-03 19:10 ` Krzysztof Kozlowski 2022-07-03 19:10 ` Krzysztof Kozlowski 2022-07-03 19:10 ` Krzysztof Kozlowski 2022-07-08 13:34 ` Sam Protsenko 2022-07-08 13:34 ` Sam Protsenko 2022-07-02 21:37 ` [PATCH 3/4] iommu/exynos: Use lookup based approach to access v7 registers Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-03 19:29 ` Krzysztof Kozlowski 2022-07-03 19:29 ` Krzysztof Kozlowski 2022-07-03 19:29 ` Krzysztof Kozlowski 2022-07-08 18:13 ` Sam Protsenko 2022-07-08 18:13 ` Sam Protsenko 2022-07-02 21:37 ` [PATCH 4/4] iommu/exynos: Add minimal support for SysMMU v7 with VM registers Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:37 ` Sam Protsenko 2022-07-02 21:48 ` [PATCH 0/4] iommu/exynos: Add basic support for SysMMU v7 Sam Protsenko 2022-07-02 21:48 ` Sam Protsenko 2022-07-02 21:48 ` Sam Protsenko 2022-07-03 12:47 ` David Virag 2022-07-03 12:47 ` David Virag 2022-07-03 12:47 ` David Virag 2022-07-06 14:24 ` Sam Protsenko 2022-07-06 14:24 ` Sam Protsenko 2022-07-06 14:24 ` Sam Protsenko 2022-07-10 23:04 ` Sam Protsenko [this message] 2022-07-10 23:04 ` Sam Protsenko 2022-07-13 14:14 ` Sam Protsenko 2022-07-13 14:14 ` Sam Protsenko
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