linux-kernel - Re: [PATCH v1 1/1 RESEND] platform/mellanox: add firmware reset support

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Message-ID: <a872def2-9738-cdc2-51ff-74ae3a27de4b@redhat.com>
Date:   Thu, 6 Apr 2023 14:28:06 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Khalil Blaiech <kblaiech@...dia.com>, markgross@...nel.org,
        vadimp@...dia.com
Cc:     platform-driver-x86@...r.kernel.org, davthompson@...dia.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1 RESEND] platform/mellanox: add firmware reset
 support

Hi,

On 4/5/23 15:16, Khalil Blaiech wrote:
> Add a new sysfs to initiate firmware reset in isolation mode.
> 
> Reviewed-by: David Thompson <davthompson@...dia.com>
> Signed-off-by: Khalil Blaiech <kblaiech@...dia.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> ---
>  drivers/platform/mellanox/mlxbf-bootctl.c | 19 +++++++++++++++++++
>  drivers/platform/mellanox/mlxbf-bootctl.h |  6 ++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c b/drivers/platform/mellanox/mlxbf-bootctl.c
> index 1c7a288b59a5..5e41c270195c 100644
> --- a/drivers/platform/mellanox/mlxbf-bootctl.c
> +++ b/drivers/platform/mellanox/mlxbf-bootctl.c
> @@ -244,11 +244,29 @@ static ssize_t secure_boot_fuse_state_show(struct device *dev,
>  	return buf_len;
>  }
>  
> +static ssize_t fw_reset_store(struct device *dev,
> +			      struct device_attribute *attr,
> +			      const char *buf, size_t count)
> +{
> +	unsigned long key;
> +	int err;
> +
> +	err = kstrtoul(buf, 16, &key);
> +	if (err)
> +		return err;
> +
> +	if (mlxbf_bootctl_smc(MLXBF_BOOTCTL_FW_RESET, key) < 0)
> +		return -EINVAL;
> +
> +	return count;
> +}
> +
>  static DEVICE_ATTR_RW(post_reset_wdog);
>  static DEVICE_ATTR_RW(reset_action);
>  static DEVICE_ATTR_RW(second_reset_action);
>  static DEVICE_ATTR_RO(lifecycle_state);
>  static DEVICE_ATTR_RO(secure_boot_fuse_state);
> +static DEVICE_ATTR_WO(fw_reset);
>  
>  static struct attribute *mlxbf_bootctl_attrs[] = {
>  	&dev_attr_post_reset_wdog.attr,
> @@ -256,6 +274,7 @@ static struct attribute *mlxbf_bootctl_attrs[] = {
>  	&dev_attr_second_reset_action.attr,
>  	&dev_attr_lifecycle_state.attr,
>  	&dev_attr_secure_boot_fuse_state.attr,
> +	&dev_attr_fw_reset.attr,
>  	NULL
>  };
>  
> diff --git a/drivers/platform/mellanox/mlxbf-bootctl.h b/drivers/platform/mellanox/mlxbf-bootctl.h
> index 148fdb43b435..b48243f60a59 100644
> --- a/drivers/platform/mellanox/mlxbf-bootctl.h
> +++ b/drivers/platform/mellanox/mlxbf-bootctl.h
> @@ -75,6 +75,12 @@
>  
>  #define MLXBF_BOOTCTL_GET_DIMM_INFO		0x82000008
>  
> +/*
> + * Initiate Firmware Reset via TYU. This might be invoked during the reset
> + * flow in isolation mode.
> + */
> +#define MLXBF_BOOTCTL_FW_RESET  0x8200000D
> +
>  /* SMC function IDs for SiP Service queries */
>  #define MLXBF_BOOTCTL_SIP_SVC_CALL_COUNT	0x8200ff00
>  #define MLXBF_BOOTCTL_SIP_SVC_UID		0x8200ff01