linux-kernel - [RFC PATCH 20/21] DO_NOT_MERGE riscv: dts: qemu: add cbqri-capable controllers

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Date:   Wed, 19 Apr 2023 04:11:10 -0700
From:   Drew Fustini <dfustini@...libre.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Ved Shanbhogue <ved@...osinc.com>,
        Kornel Dulęba <mindal@...ihalf.com>,
        Adrien Ricciardi <aricciardi@...libre.com>,
        Nicolas Pitre <npitre@...libre.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Babu Moger <babu.moger@....com>,
        Peter Newman <peternewman@...gle.com>, x86@...nel.org,
        Rob Herring <robh+dt@...nel.org>,
        James Morse <james.morse@....com>
Cc:     Drew Fustini <dfustini@...libre.com>
Subject: [RFC PATCH 20/21] DO_NOT_MERGE riscv: dts: qemu: add cbqri-capable controllers

Add nodes to for CBQRI-capable cache and memory controllers.

This is necessary as the qemu branch riscv-cbqri-rfc (based on
v8.0.0-rc4) does not yet support generating a dtb with the nodes and
properties needed for CBQRI controllers.

Thus, an external dtb (qemu-virt-cbqri.dtb) built by Linux is used when
invoking qemu-system-riscv64:

  qemu-system-riscv64 \
    -M virt \
    -nographic \
    -smp 8 \
    -bios output/images/fw_jump.elf \
    -kernel ${LINUX}/arch/riscv/boot/Image \
    -dtb ${LINUX}/arch/riscv/boot/dts/qemu/qemu-virt-cbqri.dtb \
    -append "root=/dev/vda ro" \
    -drive file=output/images/rootfs.ext2,format=raw,id=hd0 \
    -device virtio-blk-device,drive=hd0 \

Link: https://gitlab.baylibre.com/baylibre/qemu/-/tree/riscv-cbqri-rfc
Co-developed-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Drew Fustini <dfustini@...libre.com>
---
 arch/riscv/boot/dts/qemu/qemu-virt-cbqri.dts | 59 ++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/arch/riscv/boot/dts/qemu/qemu-virt-cbqri.dts b/arch/riscv/boot/dts/qemu/qemu-virt-cbqri.dts
index 400ed48a06af..2c4ddc4271cc 100644
--- a/arch/riscv/boot/dts/qemu/qemu-virt-cbqri.dts
+++ b/arch/riscv/boot/dts/qemu/qemu-virt-cbqri.dts
@@ -367,5 +367,64 @@ clint@...0000 {
 			reg = <0x00 0x2000000 0x00 0x10000>;
 			compatible = "sifive,clint0\0riscv,clint0";
 		};
+
+		cluster0_l2: controller@...0000 {
+			compatible = "foobar,cache-controller";
+			reg = <0x0 0x4820000 0x0 0x1000>; /* 4KB at 0x04820000 */
+			cache-unified;
+			cache-line-size = <64>;
+			cache-level = <2>;
+			cache-sets = <1000>;
+			cache-size = <768000>; /* 750 KiB */
+			next-level-cache = <&shared_llc>;
+			riscv,cbqri-rcid = <64>;
+			riscv,cbqri-mcid = <256>;
+		};
+
+		cluster1_l2: controller@...1000 {
+			compatible = "foobar,cache-controller";
+			reg = <0x0 0x4821000 0x0 0x1000>; /* 4KB at 0x04821000 */
+			cache-unified;
+			cache-line-size = <64>;
+			cache-level = <2>;
+			cache-sets = <1000>;
+			cache-size = <768000>; /* 750 KiB */
+			next-level-cache = <&shared_llc>;
+			riscv,cbqri-rcid = <64>;
+			riscv,cbqri-mcid = <256>;
+		};
+
+		shared_llc: controller@...b000 {
+			compatible = "foobar,cache-controller";
+			reg = <0x0 0x482b000 0x0 0x1000>; /* 4KB at 0x0482B000 */
+			cache-unified;
+			cache-line-size = <64>;
+			cache-level = <3>;
+			cache-sets = <4096>;
+			cache-size = <3145728>; /* 3 MiB */
+			riscv,cbqri-rcid = <64>;
+			riscv,cbqri-mcid = <256>;
+		};
+
+		mem0: controller@...8000 {
+			compatible = "foobar,memory-controller";
+			reg = <0x0 0x4828000 0x0 0x1000>; /* 4KB at 0x04828000 */
+			riscv,cbqri-rcid = <64>;
+			riscv,cbqri-mcid = <256>;
+		};
+
+		mem1: controller@...9000 {
+			compatible = "foobar,memory-controller";
+			reg = <0x0 0x4829000 0x0 0x1000>; /* 4KB at 0x04829000 */
+			riscv,cbqri-rcid = <64>;
+			riscv,cbqri-mcid = <256>;
+		};
+
+		mem2: controller@...a000 {
+			compatible = "foobar,memory-controller";
+			reg = <0x0 0x482a000 0x0 0x1000>; /* 4KB at 0x0482A000 */
+			riscv,cbqri-rcid = <64>;
+			riscv,cbqri-mcid = <256>;
+		};
 	};
 };
-- 
2.34.1