[PATCH v13 2/2] Documentation: Add document for UltraSoc SMB drivers
hejunhao
hejunhao3 at huawei.com
Mon Nov 14 23:33:39 PST 2022
Hi Bagas,
will apply the fix in next version.
Thank you very much.
Best regards,
Junhao.
On 2022/11/14 21:57, Bagas Sanjaya wrote:
> On Mon, Nov 14, 2022 at 05:03:16PM +0800, Junhao He wrote:
>> diff --git a/Documentation/trace/coresight/ultrasoc-smb.rst b/Documentation/trace/coresight/ultrasoc-smb.rst
>> new file mode 100644
>> index 000000000000..b7fe3f5c7f53
>> --- /dev/null
>> +++ b/Documentation/trace/coresight/ultrasoc-smb.rst
>> @@ -0,0 +1,82 @@
>> +.. SPDX-License-Identifier: GPL-2.0
>> +
>> +======================================
>> +UltraSoc - HW Assisted Tracing on SoC
>> +======================================
>> + :Author: Qi Liu <liuqi115 at huawei.com>
>> + :Date: March 2022
>> +
>> +Introduction
>> +------------
>> +
>> +UltraSoc SMB is a per SCCL(Super CPU Cluster) hardware, and it provides a
>> +way to buffer and store CPU trace messages in a region of shared system
>> +memory. SMB is plugged as a coresight sink device and the corresponding
>> +trace generators (ETM) are plugged in as source devices.
>> +
>> +Sysfs files and directories
>> +---------------------------
>> +
>> +The SMB devices appear on the existing coresight bus alongside the other
>> +coresight devices::
>> +
>> + $# ls /sys/bus/coresight/devices/
>> + ultra_smb0 ultra_smb1 ultra_smb2 ultra_smb3
>> +
>> +The ``ultra_smb<N>`` named SMB associated with SCCL.::
>> +
>> + $# ls /sys/bus/coresight/devices/ultra_smb0
>> + enable_sink mgmt
>> + $# ls /sys/bus/coresight/devices/ultra_smb0/mgmt
>> + buf_size buf_status read_pos write_pos
>> +
>> +*Key file items are:-*
>> + * ``read_pos``: Shows the value held by UltraSoc SMB Read Pointer register.
>> + * ``write_pos``: Shows the value held by UltraSoc SMB Write Pointer register.
>> + * ``buf_status``: Shows the value held by UltraSoc SMB status register.
>> + BIT(0) is zero means buffer is empty.
>> + * ``buf_size``: Shows the buffer size of each UltraSoc SMB device.
> The key list above doesn't look right, so I have applied the fixup:
>
> ---- >8 ----
>
> diff --git a/Documentation/trace/coresight/ultrasoc-smb.rst b/Documentation/trace/coresight/ultrasoc-smb.rst
> index b7fe3f5c7f53f7..5d0fa1a76b04d1 100644
> --- a/Documentation/trace/coresight/ultrasoc-smb.rst
> +++ b/Documentation/trace/coresight/ultrasoc-smb.rst
> @@ -30,11 +30,12 @@ The ``ultra_smb<N>`` named SMB associated with SCCL.::
> $# ls /sys/bus/coresight/devices/ultra_smb0/mgmt
> buf_size buf_status read_pos write_pos
>
> -*Key file items are:-*
> +Key file items are:
> +
> * ``read_pos``: Shows the value held by UltraSoc SMB Read Pointer register.
> * ``write_pos``: Shows the value held by UltraSoc SMB Write Pointer register.
> * ``buf_status``: Shows the value held by UltraSoc SMB status register.
> - BIT(0) is zero means buffer is empty.
> + BIT(0) is zero means buffer is empty.
> * ``buf_size``: Shows the buffer size of each UltraSoc SMB device.
>
> Firmware Bindings
>
>> +
>> +Firmware Bindings
>> +---------------------------
>> +
>> +SMB device is only supported with ACPI, and ACPI binding of SMB device
>> +describes SMB device indentifier, resource information and graph structure.
>> +
>> +SMB is identified by ACPI HID "HISI03A1", resource of device is declared using
>> +the _CRS method. Each SMB must present two base address, the first one is the
>> +configuration base address of SMB device, the second one is the 32bits base
>> +address of shared system memory.
>> +
>> +examples::
>> +
>> + Device(USMB) { \
>> + Name(_HID, "HISI03A1") \
>> + Name(_CRS, ResourceTemplate() { \
>> + QWordMemory (ResourceConsumer, , MinFixed, MaxFixed, NonCacheable, \
>> + ReadWrite, 0x0, 0x95100000, 0x951FFFFF, 0x0, 0x100000) \
>> + QWordMemory (ResourceConsumer, , MinFixed, MaxFixed, Cacheable, \
>> + ReadWrite, 0x0, 0x50000000, 0x53FFFFFF, 0x0, 0x4000000) \
>> + }) \
>> + Name(_DSD, Package() { \
>> + ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), \
>> + /* Use CoreSight Graph ACPI bindings to describe connections topology */
>> + Package() { \
>> + 0, \
>> + 1, \
>> + Package() { \
>> + 1, \
>> + ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"), \
>> + 8, \
>> + Package() {0x8, 0, \_SB.S00.SL11.CL28.F008, 0}, \
>> + Package() {0x9, 0, \_SB.S00.SL11.CL29.F009, 0}, \
>> + Package() {0xa, 0, \_SB.S00.SL11.CL2A.F010, 0}, \
>> + Package() {0xb, 0, \_SB.S00.SL11.CL2B.F011, 0}, \
>> + Package() {0xc, 0, \_SB.S00.SL11.CL2C.F012, 0}, \
>> + Package() {0xd, 0, \_SB.S00.SL11.CL2D.F013, 0}, \
>> + Package() {0xe, 0, \_SB.S00.SL11.CL2E.F014, 0}, \
>> + Package() {0xf, 0, \_SB.S00.SL11.CL2F.F015, 0}, \
>> + } \
>> + } \
>> + }) \
>> + }
> The rest of wordings also read a rather weird. What about below instead?
>
> ---- >8 ----
>
> diff --git a/Documentation/trace/coresight/ultrasoc-smb.rst b/Documentation/trace/coresight/ultrasoc-smb.rst
> index 5d0fa1a76b04d1..eee32cbf90d2ea 100644
> --- a/Documentation/trace/coresight/ultrasoc-smb.rst
> +++ b/Documentation/trace/coresight/ultrasoc-smb.rst
> @@ -9,21 +9,21 @@ UltraSoc - HW Assisted Tracing on SoC
> Introduction
> ------------
>
> -UltraSoc SMB is a per SCCL(Super CPU Cluster) hardware, and it provides a
> +UltraSoc SMB is a per SCCL (Super CPU Cluster) hardware. It provides a
> way to buffer and store CPU trace messages in a region of shared system
> -memory. SMB is plugged as a coresight sink device and the corresponding
> -trace generators (ETM) are plugged in as source devices.
> +memory. The device acts as a coresight sink device and the
> +corresponding trace generators (ETM) are attached as source devices.
>
> Sysfs files and directories
> ---------------------------
>
> -The SMB devices appear on the existing coresight bus alongside the other
> -coresight devices::
> +The SMB devices appear on the existing coresight bus alongside other
> +devices::
>
> $# ls /sys/bus/coresight/devices/
> ultra_smb0 ultra_smb1 ultra_smb2 ultra_smb3
>
> -The ``ultra_smb<N>`` named SMB associated with SCCL.::
> +The ``ultra_smb<N>`` names SMB device associated with SCCL.::
>
> $# ls /sys/bus/coresight/devices/ultra_smb0
> enable_sink mgmt
> @@ -32,24 +32,23 @@ The ``ultra_smb<N>`` named SMB associated with SCCL.::
>
> Key file items are:
>
> - * ``read_pos``: Shows the value held by UltraSoc SMB Read Pointer register.
> - * ``write_pos``: Shows the value held by UltraSoc SMB Write Pointer register.
> - * ``buf_status``: Shows the value held by UltraSoc SMB status register.
> - BIT(0) is zero means buffer is empty.
> - * ``buf_size``: Shows the buffer size of each UltraSoc SMB device.
> + * ``read_pos``: Shows the value on the read pointer register.
> + * ``write_pos``: Shows the value on the write pointer register.
> + * ``buf_status``: Shows the value on the status register.
> + BIT(0) is zero value which means the buffer is empty.
> + * ``buf_size``: Shows the buffer size of each device.
>
> Firmware Bindings
> ----------------------------
> +-----------------
>
> -SMB device is only supported with ACPI, and ACPI binding of SMB device
> -describes SMB device indentifier, resource information and graph structure.
> +The device is only supported with ACPI. Its binding describes device
> +identifier, resource information and graph structure.
>
> -SMB is identified by ACPI HID "HISI03A1", resource of device is declared using
> -the _CRS method. Each SMB must present two base address, the first one is the
> -configuration base address of SMB device, the second one is the 32bits base
> -address of shared system memory.
> +The device is identified as ACPI HID "HISI03A1". Device resources are allocated
> +using the _CRS method. Each device must present two base address; the first one is the configuration base address of the device, the second one is the 32-bit
> +base address of shared system memory.
>
> -examples::
> +Example::
>
> Device(USMB) { \
> Name(_HID, "HISI03A1") \
>
> Thanks.
>
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