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Date: Tue, 14 May 2024 10:05:00 +0800
From: Tengfei Fan <quic_tengfan@...cinc.com>
To: "Aiqun Yu (Maria)" <quic_aiquny@...cinc.com>,
Trilok Soni
<quic_tsoni@...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 5/14/2024 9:21 AM, Aiqun Yu (Maria) wrote:
>
>
> On 5/14/2024 12:37 AM, Trilok Soni wrote:
>> On 5/13/2024 2:07 AM, Tengfei Fan wrote:
>>> QCS8550 is derived from SM8550. The differnece between SM8550 and
>>
>> spellcheck s/difference/difference
Typos wil be modified.
>>
>>> QCS8550 is QCS8550 doesn't have modem RF system. QCS8550 is mainly used
>>> in IoT scenarios.
>>
>> IoT products and not scenarios.
I will modify this description.
>>
>>> 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.
In the next version of the patch series, I will add "The" to make the
sentence's grammar more complete.
>>
>>
>>> 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" ?
I will modify this description.
>>
>>> 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.
>
> How about like this:
> 2. Firmware related memory regions which are shared with Kernel
> The device tree source in the kernel needs to include nodes that
> indicate firmware-related shared information. A label name is suggested
> because this type of shared information needs to be referenced by
> specific drivers for handling purposes.
>
>>> 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.
We are only used for remoteproc in the upstream kernel, and I will
remove the description related to PIL.
>>
>>> 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?
>
> It means not reserved memory, normal available memory from kernel point
> of view.
>
>>
>>> | |
>>> 0xa7000000 +------------------+
>>> | |
>>> | PIL Region |
>>> | |
>>> 0x8a800000 +------------------+
>>> | |
>>> | Firmware Related |
>>> | |
>>> 0x80000000 +------------------+
>>
>>> Note that:
>>
>> Do we need to write "Note that:" ?
This "Note that:" will be removed.
>>
>>> 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.
Sure, I will modify these according to the comments above.
>>
>>> + * 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
Typos wil be modified.
>>
>>> + * 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.
Typos wil be modified.
>>
>>> + * region from 0xd8000000..0x100000000.
>>> + */
>>> + mpss_dsm_mem: mpss_dsm_region@...00000 {
>>> + reg = <0x0 0xd4d00000 0x0 0x3300000>;
>>> + no-map;
>>> + };
>>> + };
>>> +};
>
--
Thx and BRs,
Tengfei Fan
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