linux-kernel - Re: [PATCH v5 12/15] misc: bcm-vk: add sysfs interface

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Message-ID: <b835d5a6-2ece-01c1-3911-050e06a1115f@broadcom.com>
Date:   Thu, 1 Oct 2020 15:17:06 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Olof Johansson <olof@...om.net>
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Desmond Yan <desmond.yan@...adcom.com>
Subject: Re: [PATCH v5 12/15] misc: bcm-vk: add sysfs interface



On 2020-09-30 7:30 p.m., Florian Fainelli wrote:
>
>
> On 9/30/2020 6:28 PM, Scott Branden wrote:
>> Add sysfs support to query the VK card status and monitor sense points.
>> The vk-card-status and vk-card-mon details are provided in the README
>> file in the bcm-vk driver directory.
>>
>> Co-developed-by: Desmond Yan <desmond.yan@...adcom.com>
>> Signed-off-by: Desmond Yan <desmond.yan@...adcom.com>
>> Signed-off-by: Scott Branden <scott.branden@...adcom.com>
>> ---
>
> [snip]
>
>> +vk-card-status/
>> +    bus            ---> device PCIe bus
>> +    card_state        ---> summary of current card states
>> +    chip_id
>> +    firmware_status        ---> summary of all firmware status
>> +    firmware_version    ---> summary of all firmware versions
>> +    freq_core_mhz        ---> running frequency in mHz
>> +    freq_mem_mhz        ---> memory frequency in mHz
>> +    mem_size_mb        ---> memory size in MByte
>> +    os_state        ---> current running state
>> +    reset_reason        ---> last reset reason
>> +    rev_boot1        ---> boot1 firmware revision
>> +    rev_boot2        ---> boot2 firmware revision
>> +    rev_driver        ---> host driver revision
>> +    rev_flash_rom        ---> Flash ROM revision
>> +    sotp_boot1_rev_id    ---> minimum boot1 revision required
>> +    sotp_boot2_rev_id    ---> minimum boot2 revision required
>> +    sotp_dauth_1        ---> authentication key hash
>> +    sotp_dauth_1_valid    ---> authentication key validity
>> +    sotp_dauth_1_active_status -> authentication key active or not
>> +    sotp_dauth_2
>> +    sotp_dauth_2_valid
>> +    sotp_dauth_2_active_status
>> +    sotp_dauth_3
>> +    sotp_dauth_3_valid
>> +    sotp_dauth_3_active_status
>> +    sotp_dauth_4
>> +    sotp_dauth_4_valid
>> +    sotp_dauth_4_active_status
>> +    temp_threshold_lower_c    ---> thermal low threshold in Celsius
>> +    temp_threshold_upper_c    ---> thermal high threshold in Celsius
>> +    uptime_s        ---> os up time in seconds
>> +
>> +vk-card-mon/
>> +    alert_afbc_busy        ---> AFBC block stuck
>> +    alert_ecc        ---> uncorrectable ECC error(s) occurred
>> +    alert_ecc_warn        ---> correctable ECC error(s) occurred
>> +    alert_heartbeat_fail    ---> host detects heartbeat discontinuation
>> +                     from card
>> +    alert_high_temp        ---> high temperature threshold crossed
>> +    alert_intf_ver_fail    ---> interface not compatible based on version
>> +    alert_low_temp_warn    ---> low temperature threshold crossed
>> +    alert_malloc_fail_warn    ---> mem allocation failure(s) occurred
>> +    alert_pcie_down        ---> host detect pcie intf going down
>> +    alert_ssim_busy        ---> ssim block busy
>> +    alert_sys_fault        ---> system fault
>> +    alert_wdog_timeout    ---> watchdog timeout
>
> Almost all of these should be supported using the HWMON framework instead of custom attributes that do not follow the HWMON naming conventions.
Makes sense - we'll look at hwmon framework.
>
>> +    firmware_status_reg
>> +    mem_ecc            ---> correctable ECC error count
>> +    mem_uecc        ---> uncorrectable ECC error count
>
> Implementing an EDAC driver would be a bit overkill unless you have a way to signal ECC errors towards the host?
Yes, EDAC driver would be overkill here.
>
>
>> +    boot_status_reg        ---> boot status of card
>> +    pwr_state        ---> power state, 1-full, 2-reduced, 3-lowest
>> +    temperature_sensor_1_c    ---> CPU die temperature in Celsius
>> +    temperature_sensor_2_c    ---> DDR0 temperature in Celsius
>> +    temperature_sensor_3_c    ---> DDR1 temperature in Celsius
>
> Likewise.
>
>> +    utilization        ---> runtime video transcoding consumption summary
>> +    utilization_pix     ---> percentage of pixel processing used
>> +    utilization_pix_used    ---> pixel processing used
>> +    utilization_pix_max    ---> max pixel processing value which maps 100% load
>> +    utilization_codec     ---> percentage of codec sessions used
>> +    utilization_codec_used    ---> codec sessions currently used
>> +    utilization_codec_max    ---> max codec sessions allowed
>> +    voltage_18_mv        ---> 1.8v voltage rail in mv
>> +    voltage_33_mv        ---> 3.3v voltage rail in mv
>
> Likewise
>
>> +
>> +The sysfs entry supports only the read operation.
>
> entries.


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