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linux-riscv@lists.infradead.org, hch@lst.de, Nicolas Saenz Julienne References: <20190909095807.18709-1-nsaenzjulienne@suse.de> <5a8af6e9-6b90-ce26-ebd7-9ee626c9fa0e@gmx.net> <3f9af46e-2e1a-771f-57f2-86a53caaf94a@suse.com> <09f82f88-a13a-b441-b723-7bb061a2f1e3@gmail.com> <2c3e1ef3-0dba-9f79-52e2-314b6b500e14@gmx.net> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=mbrugger@suse.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u EgO44+eFgv082xtBez5WNkGn18vtw0LW3ESmKh19u6kEGoi0WZwslCNaGFrS4M7OH+aOJeqK fx5dIv2CEbxc6xnHY7dwkcHikTA4QdbdFeUSuj4YhIZ+0QlDVtS1QEXyvZbZky7ur9rHkZvP 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tDbHekrQMtKglHFZvu9kHS6j0LMJKbcj75pijMXbnFChP7vMLHZxCLfePC+ckArWjhWU3Hfp F+vHMGpzW5kbMkEJC7jxSOZRKxPBYLcekT8P2wz7EAKzzTeUVQhkLkfrYbTn1wI8BcqCwWk0 wqYEBbB4GRUkCKyhB5fnQ4/7/XUCtXRy/585N8mPT8rAVclppiHctRA0gssE3GRKuEIuXx1S DnchsfHg18gCCrEtYZ9czwNjVoV1Tv2lpzTTk+6HEJaQpMnPeAKbOeehq3gYKcvmDL+bRCTj mXg8WrBZdUuj0BCDYqneaUgVnp+wQogA3mHGVs281v1XZmjlsVmM9Y8VPE614zSiZQBL5Cin BTTI8ssYlV/aIKYi0dxRcj6vYnAfUImOsdZ5AQja5xIqw1rwWWUOYb99 Message-ID: <4a6f965b-c988-5839-169f-9f24a0e7a567@suse.com> Date: Fri, 13 Sep 2019 10:09:30 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <2c3e1ef3-0dba-9f79-52e2-314b6b500e14@gmx.net> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190913_010943_842664_13A04A6C X-CRM114-Status: GOOD ( 24.96 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: f.fainelli@gmail.com, robin.murphy@arm.com, linux-kernel@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, phill@raspberrypi.org, will@kernel.org, m.szyprowski@samsung.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org On 12/09/2019 21:32, Stefan Wahren wrote: > > Am 12.09.19 um 19:18 schrieb Matthias Brugger: >> >> On 10/09/2019 11:27, Matthias Brugger wrote: >>> >>> On 09/09/2019 21:33, Stefan Wahren wrote: >>>> Hi Nicolas, >>>> >>>> Am 09.09.19 um 11:58 schrieb Nicolas Saenz Julienne: >>>>> Hi all, >>>>> this series attempts to address some issues we found while bringing up >>>>> the new Raspberry Pi 4 in arm64 and it's intended to serve as a follow >>>>> up of these discussions: >>>>> v4: https://lkml.org/lkml/2019/9/6/352 >>>>> v3: https://lkml.org/lkml/2019/9/2/589 >>>>> v2: https://lkml.org/lkml/2019/8/20/767 >>>>> v1: https://lkml.org/lkml/2019/7/31/922 >>>>> RFC: https://lkml.org/lkml/2019/7/17/476 >>>>> >>>>> The new Raspberry Pi 4 has up to 4GB of memory but most peripherals can >>>>> only address the first GB: their DMA address range is >>>>> 0xc0000000-0xfc000000 which is aliased to the first GB of physical >>>>> memory 0x00000000-0x3c000000. Note that only some peripherals have these >>>>> limitations: the PCIe, V3D, GENET, and 40-bit DMA channels have a wider >>>>> view of the address space by virtue of being hooked up trough a second >>>>> interconnect. >>>>> >>>>> Part of this is solved on arm32 by setting up the machine specific >>>>> '.dma_zone_size = SZ_1G', which takes care of reserving the coherent >>>>> memory area at the right spot. That said no buffer bouncing (needed for >>>>> dma streaming) is available at the moment, but that's a story for >>>>> another series. >>>>> >>>>> Unfortunately there is no such thing as 'dma_zone_size' in arm64. Only >>>>> ZONE_DMA32 is created which is interpreted by dma-direct and the arm64 >>>>> arch code as if all peripherals where be able to address the first 4GB >>>>> of memory. >>>>> >>>>> In the light of this, the series implements the following changes: >>>>> >>>>> - Create both DMA zones in arm64, ZONE_DMA will contain the first 1G >>>>> area and ZONE_DMA32 the rest of the 32 bit addressable memory. So far >>>>> the RPi4 is the only arm64 device with such DMA addressing limitations >>>>> so this hardcoded solution was deemed preferable. >>>>> >>>>> - Properly set ARCH_ZONE_DMA_BITS. >>>>> >>>>> - Reserve the CMA area in a place suitable for all peripherals. >>>>> >>>>> This series has been tested on multiple devices both by checking the >>>>> zones setup matches the expectations and by double-checking physical >>>>> addresses on pages allocated on the three relevant areas GFP_DMA, >>>>> GFP_DMA32, GFP_KERNEL: >>>>> >>>>> - On an RPi4 with variations on the ram memory size. But also forcing >>>>> the situation where all three memory zones are nonempty by setting a 3G >>>>> ZONE_DMA32 ceiling on a 4G setup. Both with and without NUMA support. >>>>> >>>> i like to test this series on Raspberry Pi 4 and i have some questions >>>> to get arm64 running: >>>> >>>> Do you use U-Boot? Which tree? >>> If you want to use U-Boot, try v2019.10-rc4, it should have everything you need >>> to boot your kernel. >>> >> Ok, here is a thing. In the linux kernel we now use bcm2711 as SoC name, but the >> RPi4 devicetree provided by the FW uses mostly bcm2838. > > Do you mean the DTB provided at runtime? > > You mean the merged U-Boot changes, doesn't work with my Raspberry Pi > series? > >> U-Boot in its default >> config uses the devicetree provided by the FW, mostly because this way you don't >> have to do anything to find out how many RAM you really have. Secondly because >> this will allow us, in the near future, to have one U-boot binary for both RPi3 >> and RPi4 (and as a side effect one binary for RPi1 and RPi2). >> >> Anyway, I found at least, that the following compatibles need to be added: >> >> "brcm,bcm2838-cprman" >> "brcm,bcm2838-gpio" >> >> Without at least the cprman driver update, you won't see anything. >> >> "brcm,bcm2838-rng200" is also a candidate. >> >> I also suppose we will need to add "brcm,bcm2838" to >> arch/arm/mach-bcm/bcm2711.c, but I haven't verified this. > How about changing this in the downstream kernel? Which is much easier. I'm not sure I understand what you want to say. My goal is to use the upstream kernel with the device tree blob provided by the FW. If you talk about the downstream kernel, I suppose you mean we should change this in the FW DT blob and in the downstream kernel. That would work for me. Did I understand you correctly? >> >> Regards, >> Matthias >> >>> Regards, >>> Matthias >>> >>>> Are there any config.txt tweaks necessary? >>>> >>>> >>> _______________________________________________ >>> linux-arm-kernel mailing list >>> linux-arm-kernel@lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >>> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv