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Date: Tue, 4 Jun 2024 13:20:25 +0200
From: Caleb Connolly <caleb.connolly@...aro.org>
To: "Aiqun Yu (Maria)" <quic_aiquny@...cinc.com>,
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: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH v9 2/4] arm64: dts: qcom: qcs8550: introduce qcs8550 dtsi
On 04/06/2024 12:51, Aiqun Yu (Maria) wrote:
>
>
> On 6/3/2024 5:20 PM, Caleb Connolly wrote:
>> Hi Tengfei,
>>
>> On 29/05/2024 12:09, Tengfei Fan wrote:
>>> QCS8550 is derived from SM8550. The difference between SM8550 and
>>> QCS8550 is QCS8550 doesn't have modem RF system. QCS8550 is mainly used
>>> in IoT products.
>>> 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. Bootloader converys the
>>> information by updating devicetree at 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.
>>
>> Are you describing some particular quirk of the platform here, or just
>> standard UEFI booting?
>
> It's standard UEFI booting efi config table.
Ok, thanks for confirming.
>>
>> When booting with UEFI, the memory map is passed via the ESRT, so having
>> memory that the kernel shouldn't use it pretty simple (and typical).
woo! \o/
>
> yes. It is very simple. And the bootloader firmware config the
> "reserved" region in the efi config table from the uefi firmware.
>>> 2. Firmware related memory regions which are shared with Kernel
>>> The device tree source in the kernel needs to include nodes that
>>> indicate fimware-related shared information. A label name is suggested
>>> because this type of shared information needs to be referenced by
>>> specific drivers for handling purposes.
>>
>> Again, is there something non-standard here? If not I would suggest
>> dropping these detail comments as they might be misleading.
>
> Detailed comments is used to describe current device tree reserved
> memory regions.
>
> Current patch is not creating a new mechanism to have memory map
> described. But it is the first time qcom device trees use this design,
> and have a simplified(also more compatible) device tree reserved memory
> region(memory map). Previously, bootloader(apps bootloader) only pass
> the whole physical memory base and size, and use reserved memory nodes
> only in device tree(which is also a standard choose).
>
> So that's why it is detailed comments for other qcom platform reference.
Doesn't the rb3gen2 also use this design?
>
>>
>> Thanks and regards,
>>> 3. Remoteproc regions.
>>> Remoteproc 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 |
>>> | |
>>> 0xa7000000 +-------------------+
>>> | |
>>> | Remoteproc Region |
>>> | |
>>> 0x8a800000 +-------------------+
>>> | |
>>> | Firmware Related |
>>> | |
>>> 0x80000000 +-------------------+
>>>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> Signed-off-by: Tengfei Fan <quic_tengfan@...cinc.com>
>>> ---
>>> arch/arm64/boot/dts/qcom/qcs8550.dtsi | 167 ++++++++++++++++++++++++++
>>> 1 file changed, 167 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..685668c6ad14
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/qcom/qcs8550.dtsi
>>> @@ -0,0 +1,167 @@
>>> +// 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.
>>> Bootloader
>>> + * conveys the information by updating devicetree at 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
>>> + * The device tree source in the kernel needs to include
>>> nodes
>>> + * that indicate fimware-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. Remoteproc regions.
>>> + * Remoteproc 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 |
>>> + * | |
>>> + * 0xa7000000 +-------------------+
>>> + * | |
>>> + * | Remoteproc Region |
>>> + * | |
>>> + * 0x8a800000 +-------------------+
>>> + * | |
>>> + * | Firmware Related |
>>> + * | |
>>> + * 0x80000000 +-------------------+
>>> + */
>>> +
>>> + /*
>>> + * Firmware related regions, bootloader will possible reserve
>>> parts of
>>> + * 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, bootloader will possible reserve
>>> parts of
>>> + * region from 0xd8000000..0x100000000.
>>> + */
>>> + mpss_dsm_mem: mpss_dsm_region@...00000 {
>>> + reg = <0x0 0xd4d00000 0x0 0x3300000>;
>>> + no-map;
>>> + };
>>> + };
>>> +};
>>
>
--
// Caleb (they/them)
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