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[209.85.217.51]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-539b018968asm1032185e0c.3.2025.08.08.04.45.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Aug 2025 04:45:22 -0700 (PDT) Received: by mail-vs1-f51.google.com with SMTP id ada2fe7eead31-504dd871d70so647452137.0; Fri, 08 Aug 2025 04:45:21 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCUgs8NBwzJpVWKDN1AkBLX6PNxnpd0F/dSRk7fh0N0GtWlTx27zglnyf+jAQomk/z19vTyTBqvwQskbk0mO4d2SA0A=@vger.kernel.org, AJvYcCVqJ8s7JBgmVIs0XTIK3KgSc7LG2v+5Bf5TpPRyMX0qzml4AugmwSZfJeF5Oxzco+VYrNnMgiVWj8LVBl2R@vger.kernel.org, AJvYcCW5/siLmiC0TFpwsPufqpH1Es6c3MexWx8N5YoKL2fhqt2bJnwGy6B68lKZPZcOvcROMcfeDwrZ8toJ@vger.kernel.org, AJvYcCXSHciOpWspGB38ii7336FVI6PoUUT7D7HSvHEesWsc6wOncI+O9G27VHBfY9Odb3YD+AnRH0DDFl0A@vger.kernel.org, AJvYcCXXkJ3ob2750dHd1Fazyeia+Q9a2/Zehl8A2qiaYS1SLsMvok4h6TKBZ3S4YsiDWw52w2vaq2FvGXd4@vger.kernel.org X-Received: by 2002:a05:6102:5ccc:b0:4cb:5d6c:9946 with SMTP id ada2fe7eead31-5060d2a74damr861831137.10.1754653521602; Fri, 08 Aug 2025 04:45:21 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20250704161410.3931884-1-claudiu.beznea.uj@bp.renesas.com> <20250704161410.3931884-8-claudiu.beznea.uj@bp.renesas.com> <7c8c7a25-c373-452a-9fe8-8b2d92ddd885@tuxon.dev> In-Reply-To: From: Geert Uytterhoeven Date: Fri, 8 Aug 2025 13:45:10 +0200 X-Gmail-Original-Message-ID: X-Gm-Features: Ac12FXz7HpF5HU5dBXnxnL240s782w9rEqQwz4F0XZ8wdldivob67uVHXOAVnQM Message-ID: Subject: Re: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update dma-ranges for PCIe To: Biju Das Cc: "Claudiu.Beznea" , "bhelgaas@google.com" , "lpieralisi@kernel.org" , "kwilczynski@kernel.org" , "mani@kernel.org" , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "geert+renesas@glider.be" , "magnus.damm@gmail.com" , "catalin.marinas@arm.com" , "will@kernel.org" , "mturquette@baylibre.com" , "sboyd@kernel.org" , "p.zabel@pengutronix.de" , "lizhi.hou@amd.com" , "linux-pci@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-clk@vger.kernel.org" , Claudiu Beznea , Wolfram Sang Content-Type: text/plain; charset="UTF-8" On Wed, 9 Jul 2025 at 07:05, Biju Das wrote: > > From: Claudiu Beznea > > On 07.07.2025 11:18, Biju Das wrote: > > >> From: Claudiu > > >> Sent: 04 July 2025 17:14 > > >> Subject: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update > > >> dma-ranges for PCIe > > >> > > >> From: Claudiu Beznea > > >> > > >> The first 128MB of memory is reserved on this board for secure area. > > >> Update the PCIe dma-ranges property to reflect this. > > > > > > I see R-Car PCIe dma-ranges[1] and [2] maps all possible DDR area supported by the SoC? > > > Do we need to make board specific as well there? > > > > I'm not familiar with R-Car, but if there are ranges reserved for other purposes, I think we should > > reflect it in board specific device trees. > > Already Linux has this DDR info[1]. Linux provides DMA memory only from this region. > > In your testing, have you faced any issue like system allocated DMA region other than [1] > and you don't want to use it, then the changes are ok?? Exactly. PCI memory must be located in the intersection of dma-ranges in r9a08g045s33.dtsi and the various memory nodes in rzg3s-smarc-som.dtsi. The latter already excludes the secure area. > Not sure, PCIe can work on internal memory such as SRAM? If that is the case, it should be reflected in r9a08g045s33.dtsi. > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi?h=next-20250708#n31 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds