On 6/18/2024 6:06 PM, Caleb Connolly wrote:
HI Tengfei,
On 18/06/2024 09:22, 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.
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.
Unlike previous platforms, QCS8550 boots using EFI and describes
most reserved regions in the ESRT memory map. As a result, reserved
memory regions which aren't relevant to the kernel(like the hypervisor
region) don't need to be described in DT.
3. Remoteproc regions.
Remoteproc regions will be reserved and then assigned to subsystem
firmware later.
Here is a reserved memory map for this platform:
0x80000000 +-------------------+
| |
| Firmware Related |
| |
0x8a800000 +-------------------+
| |
| Remoteproc Region |
| |
0xa7000000 +-------------------+
| |
| Kernel Available |
| |
0xd4d00000 +-------------------+
| |
| Firmware Related |
| |
0x100000000 +-------------------+
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Tengfei Fan <quic_tengfan@xxxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/qcs8550.dtsi | 162 ++++++++++++++++++++++++++
1 file changed, 162 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..07b314834d88
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/qcs8550.dtsi
@@ -0,0 +1,162 @@
+// 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.
This is a lot of implementation detail about UEFI, I'd imagine that
anyone curious can go read the relevant docs instead. It's a lot of
words just to say "Firmware regions which the kernel doesn't need to
know about which are not included in the EFI provided memory map."
The following update will be applied to this point:
1. Firmware related regions which aren't shared with kernel.
Firmware regions which the kernel doesn't need to know about which
are not included in the EFI provided memory map.
+ * 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.
"Firmware regions the kernel DOES need to know about, which are
described in the reserved-memory node".
The following update will be applied to this point:
2. Firmware related memory regions which are shared with Kernel
Firmware regions the kernel does need to know about, which are described
in the reserved-memory node.
+ * Unlike previous platforms, QCS8550 boots using EFI and
describes
+ * most reserved regions in the ESRT memory map. As a result,
reserved
+ * memory regions which aren't relevant to the kernel(like
the hypervisor
+ ( region) don't need to be described in DT.
These would fall under (1) "firmware the kernel doesn't need to know about"
This will be removed from its current position.
+ * 3. Remoteproc regions.
+ * Remoteproc regions will be reserved and then assigned to
+ * subsystem firmware later.
How do these differ from those described in (2)?
This point will do the following update:
3. Remoteproc regions
Remoteproc regions will be reserved and then assigned to subsystem
firmware later.
Remoteproc regions can be loaded either in a fixed form or in a
relocatable form, depending on the platform.
I think this comment is trying to describe too much at once. You're
trying to describe what the different types of reserved memory are, how
the kernel learns about them, and how this differs from previous
platforms all at once. I think you should tackle these points separately:
First describe the types of reserved memory and how the kernel learns
about them (my suggestions above). Then describe the differences with
previous platforms (like the hypervisor example)
Thanks and regards,
Your previous suggestion will be incorporated here as follows:
Unlike previous platforms, QCS8550 boots using EFI and describes most
reserved regions in the ESRT memory map. As a result, reserved memory
regions which aren't relevant to the kernel(like the hypervisor region)
don't need to be described in DT.
Is it reasonable to place it here?
Thanks!
+ * Here is a reserved memory map for this platform:
+ * 0x80000000 +-------------------+
+ * | |
+ * | Firmware Related |
+ * | |
+ * 0x8a800000 +-------------------+
+ * | |
+ * | Remoteproc Region |
+ * | |
+ * 0xa7000000 +-------------------+
+ * | |
+ * | Kernel Available |
+ * | |
+ * 0xd4d00000 +-------------------+
+ * | |
+ * | Firmware Related |
+ * | |
+ * 0x100000000 +-------------------+
+ */
+
+ aop_image_mem: aop-image-region@81c00000 {
+ reg = <0x0 0x81c00000 0x0 0x60000>;
+ no-map;
+ };
+
+ aop_cmd_db_mem: aop-cmd-db-region@81c60000 {
+ compatible = "qcom,cmd-db";
+ reg = <0x0 0x81c60000 0x0 0x20000>;
+ no-map;
+ };
+
+ aop_config_mem: aop-config-region@81c80000 {
+ no-map;
+ reg = <0x0 0x81c80000 0x0 0x20000>;
+ };
+
+ smem_mem: smem-region@81d00000 {
+ compatible = "qcom,smem";
+ reg = <0x0 0x81d00000 0x0 0x200000>;
+ hwlocks = <&tcsr_mutex 3>;
+ no-map;
+ };
+
+ adsp_mhi_mem: adsp-mhi-region@81f00000 {
+ reg = <0x0 0x81f00000 0x0 0x20000>;
+ no-map;
+ };
+
+ mpss_mem: mpss-region@8a800000 {
+ reg = <0x0 0x8a800000 0x0 0x10800000>;
+ no-map;
+ };
+
+ q6_mpss_dtb_mem: q6-mpss-dtb-region@9b000000 {
+ reg = <0x0 0x9b000000 0x0 0x80000>;
+ no-map;
+ };
+
+ ipa_fw_mem: ipa-fw-region@9b080000 {
+ reg = <0x0 0x9b080000 0x0 0x10000>;
+ no-map;
+ };
+
+ ipa_gsi_mem: ipa-gsi-region@9b090000 {
+ reg = <0x0 0x9b090000 0x0 0xa000>;
+ no-map;
+ };
+
+ gpu_micro_code_mem: gpu-micro-code-region@9b09a000 {
+ reg = <0x0 0x9b09a000 0x0 0x2000>;
+ no-map;
+ };
+
+ spss_region_mem: spss-region@9b100000 {
+ reg = <0x0 0x9b100000 0x0 0x180000>;
+ no-map;
+ };
+
+ spu_secure_shared_memory_mem:
spu-secure-shared-memory-region@9b280000 {
+ reg = <0x0 0x9b280000 0x0 0x80000>;
+ no-map;
+ };
+
+ camera_mem: camera-region@9b300000 {
+ reg = <0x0 0x9b300000 0x0 0x800000>;
+ no-map;
+ };
+
+ video_mem: video-region@9bb00000 {
+ reg = <0x0 0x9bb00000 0x0 0x700000>;
+ no-map;
+ };
+
+ cvp_mem: cvp-region@9c200000 {
+ reg = <0x0 0x9c200000 0x0 0x700000>;
+ no-map;
+ };
+
+ cdsp_mem: cdsp-region@9c900000 {
+ reg = <0x0 0x9c900000 0x0 0x2000000>;
+ no-map;
+ };
+
+ q6_cdsp_dtb_mem: q6-cdsp-dtb-region@9e900000 {
+ reg = <0x0 0x9e900000 0x0 0x80000>;
+ no-map;
+ };
+
+ q6_adsp_dtb_mem: q6-adsp-dtb-region@9e980000 {
+ reg = <0x0 0x9e980000 0x0 0x80000>;
+ no-map;
+ };
+
+ adspslpi_mem: adspslpi-region@9ea00000 {
+ reg = <0x0 0x9ea00000 0x0 0x4080000>;
+ no-map;
+ };
+
+ mpss_dsm_mem: mpss_dsm_region@d4d00000 {
+ reg = <0x0 0xd4d00000 0x0 0x3300000>;
+ no-map;
+ };
+ };
+};
--
Thx and BRs,
Tengfei Fan
