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Date: Mon, 13 May 2024 09:37:26 -0700
From: Trilok Soni <quic_tsoni@...cinc.com>
To: Tengfei Fan <quic_tengfan@...cinc.com>, <andersson@...nel.org>,
<konrad.dybcio@...aro.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
<conor+dt@...nel.org>, <dmitry.baryshkov@...aro.org>
CC: <keescook@...omium.org>, <tony.luck@...el.com>, <gpiccoli@...lia.com>,
<linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>,
<kernel@...cinc.com>
Subject: Re: [PATCH v8 2/4] arm64: dts: qcom: qcs8550: introduce qcs8550 dtsi
On 5/13/2024 2:07 AM, Tengfei Fan wrote:
> QCS8550 is derived from SM8550. The differnece between SM8550 and
spellcheck s/difference/difference
> QCS8550 is QCS8550 doesn't have modem RF system. QCS8550 is mainly used
> in IoT scenarios.
IoT products and not scenarios.
> QCS8550 firmware has different memory map with SM8550 firmware.
"QCS8550 firmware has different memory map compared to SM8550"
The
> memory map will be runtime added through bootloader.
> There are 3 types of reserved memory regions here:
> 1. Firmware related regions which aren't shared with kernel.
> The device tree source in kernel doesn't need to have node to indicate
> the firmware related reserved information. OS bootloader conveys the
Just "Bootloader conveys the information by updating devicetree at runtime" ?
> information by update device tree in runtime.
> This will be described as: UEFI saves the physical address of the
> UEFI System Table to dts file's chosen node. Kernel read this table and
> add reserved memory regions to efi config table. Current reserved memory
> region may have reserved region which was not yet used, release note of
> the firmware have such kind of information.
I understand what you are trying to explain below, but can we simplify further? I
had to read multiple times to understand what you are trying to convey above.
> 2. Firmware related memory regions which are shared with Kernel
> Each region has a specific node with specific label name for later
> phandle reference from other driver dt node.
> 3. PIL regions.
Do we use the PIL - peripheral image loader in the upstream kernel or just remoteproc?
I am fine w/ PIL if it is used at other places in Qualcomm remoteproc.
> PIL regions will be reserved and then assigned to subsystem firmware
> later.
> Here is a reserved memory map for this platform:
> 0x100000000 +------------------+
> | |
> | Firmware Related |
> | |
> 0xd4d00000 +------------------+
> | |
> | Kernel Available |
What is "kernel available" means?
> | |
> 0xa7000000 +------------------+
> | |
> | PIL Region |
> | |
> 0x8a800000 +------------------+
> | |
> | Firmware Related |
> | |
> 0x80000000 +------------------+
> Note that:
Do we need to write "Note that:" ?
> 0xa7000000..0xA8000000 is used by bootloader, when kernel boot up,
> it is available for kernel usage. This region is not suggested to be
> used by kernel features like ramoops, suspend resume etc.
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Tengfei Fan <quic_tengfan@...cinc.com>
> ---
> arch/arm64/boot/dts/qcom/qcs8550.dtsi | 169 ++++++++++++++++++++++++++
> 1 file changed, 169 insertions(+)
> create mode 100644 arch/arm64/boot/dts/qcom/qcs8550.dtsi
>
> diff --git a/arch/arm64/boot/dts/qcom/qcs8550.dtsi b/arch/arm64/boot/dts/qcom/qcs8550.dtsi
> new file mode 100644
> index 000000000000..a3ebf3d4e16d
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/qcs8550.dtsi
> @@ -0,0 +1,169 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2023-2024, Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include "sm8550.dtsi"
> +
> +/delete-node/ &reserved_memory;
> +
> +/ {
> + reserved_memory: reserved-memory {
> + #address-cells = <2>;
> + #size-cells = <2>;
> + ranges;
> +
> +
> + /* These are 3 types of reserved memory regions here:
> + * 1. Firmware related regions which aren't shared with kernel.
> + * The device tree source in kernel doesn't need to have node to
> + * indicate the firmware related reserved information. OS bootloader
> + * conveys the information by update device tree in runtime.
> + * This will be described as: UEFI saves the physical address of
> + * the UEFI System Table to dts file's chosen node. Kernel read this
> + * table and add reserved memory regions to efi config table. Current
> + * reserved memory region may have reserved region which was not yet
> + * used, release note of the firmware have such kind of information.
> + * 2. Firmware related memory regions which are shared with Kernel.
> + * Each region has a specific node with specific label name for
> + * later phandle reference from other driver dt node.
> + * 3. PIL regions.
> + * PIL regions will be reserved and then assigned to subsystem
> + * firmware later.
> + * Here is a reserved memory map for this platform:
Just check the comment above and it will apply here.
> + * 0x100000000 +------------------+
> + * | |
> + * | Firmware Related |
> + * | |
> + * 0xd4d00000 +------------------+
> + * | |
> + * | Kernel Available |
> + * | |
> + * 0xa7000000 +------------------+
> + * | |
> + * | PIL Region |
> + * | |
> + * 0x8a800000 +------------------+
> + * | |
> + * | Firmware Related |
> + * | |
> + * 0x80000000 +------------------+
> + * Note that:
> + * 0xa7000000..0xA8000000 is used by bootloader, when kernel boot up,
> + * it is available for kernel usage. This region is not suggested to
> + * be used by kernel features like ramoops, suspend resume etc.
> + */
> +
> + /*
> + * Firmware related regions, bootlader will possible reserve parts of
spellcheck s/bootlader/bootloader
> + * region from 0x80000000..0x8a800000.
> + */
> + aop_image_mem: aop-image-region@...00000 {
> + reg = <0x0 0x81c00000 0x0 0x60000>;
> + no-map;
> + };
> +
> + aop_cmd_db_mem: aop-cmd-db-region@...60000 {
> + compatible = "qcom,cmd-db";
> + reg = <0x0 0x81c60000 0x0 0x20000>;
> + no-map;
> + };
> +
> + aop_config_mem: aop-config-region@...80000 {
> + no-map;
> + reg = <0x0 0x81c80000 0x0 0x20000>;
> + };
> +
> + smem_mem: smem-region@...00000 {
> + compatible = "qcom,smem";
> + reg = <0x0 0x81d00000 0x0 0x200000>;
> + hwlocks = <&tcsr_mutex 3>;
> + no-map;
> + };
> +
> + adsp_mhi_mem: adsp-mhi-region@...00000 {
> + reg = <0x0 0x81f00000 0x0 0x20000>;
> + no-map;
> + };
> +
> + /* PIL region */
> + mpss_mem: mpss-region@...00000 {
> + reg = <0x0 0x8a800000 0x0 0x10800000>;
> + no-map;
> + };
> +
> + q6_mpss_dtb_mem: q6-mpss-dtb-region@...00000 {
> + reg = <0x0 0x9b000000 0x0 0x80000>;
> + no-map;
> + };
> +
> + ipa_fw_mem: ipa-fw-region@...80000 {
> + reg = <0x0 0x9b080000 0x0 0x10000>;
> + no-map;
> + };
> +
> + ipa_gsi_mem: ipa-gsi-region@...90000 {
> + reg = <0x0 0x9b090000 0x0 0xa000>;
> + no-map;
> + };
> +
> + gpu_micro_code_mem: gpu-micro-code-region@...9a000 {
> + reg = <0x0 0x9b09a000 0x0 0x2000>;
> + no-map;
> + };
> +
> + spss_region_mem: spss-region@...00000 {
> + reg = <0x0 0x9b100000 0x0 0x180000>;
> + no-map;
> + };
> +
> + spu_secure_shared_memory_mem: spu-secure-shared-memory-region@...80000 {
> + reg = <0x0 0x9b280000 0x0 0x80000>;
> + no-map;
> + };
> +
> + camera_mem: camera-region@...00000 {
> + reg = <0x0 0x9b300000 0x0 0x800000>;
> + no-map;
> + };
> +
> + video_mem: video-region@...00000 {
> + reg = <0x0 0x9bb00000 0x0 0x700000>;
> + no-map;
> + };
> +
> + cvp_mem: cvp-region@...00000 {
> + reg = <0x0 0x9c200000 0x0 0x700000>;
> + no-map;
> + };
> +
> + cdsp_mem: cdsp-region@...00000 {
> + reg = <0x0 0x9c900000 0x0 0x2000000>;
> + no-map;
> + };
> +
> + q6_cdsp_dtb_mem: q6-cdsp-dtb-region@...00000 {
> + reg = <0x0 0x9e900000 0x0 0x80000>;
> + no-map;
> + };
> +
> + q6_adsp_dtb_mem: q6-adsp-dtb-region@...80000 {
> + reg = <0x0 0x9e980000 0x0 0x80000>;
> + no-map;
> + };
> +
> + adspslpi_mem: adspslpi-region@...00000 {
> + reg = <0x0 0x9ea00000 0x0 0x4080000>;
> + no-map;
> + };
> +
> + /*
> + * Firmware related regions, bootlader will possible reserve parts of
Ditto.
> + * region from 0xd8000000..0x100000000.
> + */
> + mpss_dsm_mem: mpss_dsm_region@...00000 {
> + reg = <0x0 0xd4d00000 0x0 0x3300000>;
> + no-map;
> + };
> + };
> +};
--
---Trilok Soni
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