linux-kernel - Re: [PATCH] firmware: stratix10-svc: extend SVC driver to get the firmware version

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Message-ID: <YGNOruQFFvD0fgBb@epycbox.lan>
Date:   Tue, 30 Mar 2021 09:15:42 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     richard.gong@...ux.intel.com
Cc:     gregkh@...uxfoundation.org, mdf@...nel.org,
        linux-kernel@...r.kernel.org, Richard Gong <richard.gong@...el.com>
Subject: Re: [PATCH] firmware: stratix10-svc: extend SVC driver to get the
 firmware version

Hi Richard,

On Tue, Mar 30, 2021 at 09:33:05AM -0500, richard.gong@...ux.intel.com wrote:
> From: Richard Gong <richard.gong@...el.com>
> 
> Extend Intel service layer driver to get the firmware version running at
> FPGA device. Therefore FPGA manager driver, one of Intel service layer
> driver's client, can decide whether to handle the newly added bitstream
> authentication function based on the retrieved firmware version.
> 
> Signed-off-by: Richard Gong <richard.gong@...el.com>
> Acked-by: Moritz Fischr <mdf@...nel.org>
> ---
>  drivers/firmware/stratix10-svc.c                    | 12 ++++++++++--
>  include/linux/firmware/intel/stratix10-smc.h        | 21 +++++++++++++++++++--
>  include/linux/firmware/intel/stratix10-svc-client.h |  4 ++++
>  3 files changed, 33 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
> index 3aa489d..1443bbd 100644
> --- a/drivers/firmware/stratix10-svc.c
> +++ b/drivers/firmware/stratix10-svc.c
> @@ -306,6 +306,7 @@ static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
>  		break;
>  	case COMMAND_RSU_RETRY:
>  	case COMMAND_RSU_MAX_RETRY:
> +	case COMMAND_FIRMWARE_VERSION:
>  		cb_data->status = BIT(SVC_STATUS_OK);
>  		cb_data->kaddr1 = &res.a1;
>  		break;
> @@ -422,6 +423,11 @@ static int svc_normal_to_secure_thread(void *data)
>  			a1 = 0;
>  			a2 = 0;
>  			break;
> +		case COMMAND_FIRMWARE_VERSION:
> +			a0 = INTEL_SIP_SMC_FIRMWARE_VERSION;
> +			a1 = 0;
> +			a2 = 0;
> +			break;
>  		default:
>  			pr_warn("it shouldn't happen\n");
>  			break;
> @@ -487,11 +493,13 @@ static int svc_normal_to_secure_thread(void *data)
>  
>  			/*
>  			 * be compatible with older version firmware which
> -			 * doesn't support RSU notify or retry
> +			 * doesn't support RSU notify, retry or bitstream
> +			 * authentication.
>  			 */
>  			if ((pdata->command == COMMAND_RSU_RETRY) ||
>  			    (pdata->command == COMMAND_RSU_MAX_RETRY) ||
> -				(pdata->command == COMMAND_RSU_NOTIFY)) {
> +			    (pdata->command == COMMAND_RSU_NOTIFY) ||
> +			    (pdata->command == COMMAND_FIRMWARE_VERSION)) {
>  				cbdata->status =
>  					BIT(SVC_STATUS_NO_SUPPORT);
>  				cbdata->kaddr1 = NULL;
> diff --git a/include/linux/firmware/intel/stratix10-smc.h b/include/linux/firmware/intel/stratix10-smc.h
> index c3e5ab0..505fcca 100644
> --- a/include/linux/firmware/intel/stratix10-smc.h
> +++ b/include/linux/firmware/intel/stratix10-smc.h
> @@ -321,8 +321,6 @@ INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_FPGA_CONFIG_COMPLETED_WRITE)
>  #define INTEL_SIP_SMC_ECC_DBE \
>  	INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_ECC_DBE)
>  
> -#endif
> -
>  /**
>   * Request INTEL_SIP_SMC_RSU_NOTIFY
>   *
> @@ -404,3 +402,22 @@ INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_FPGA_CONFIG_COMPLETED_WRITE)
>  #define INTEL_SIP_SMC_FUNCID_RSU_MAX_RETRY 18
>  #define INTEL_SIP_SMC_RSU_MAX_RETRY \
>  	INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_RSU_MAX_RETRY)
> +
> +/**
> + * Request INTEL_SIP_SMC_FIRMWARE_VERSION
> + *
> + * Sync call used to query the version of running firmware
> + *
> + * Call register usage:
> + * a0 INTEL_SIP_SMC_FIRMWARE_VERSION
> + * a1-a7 not used
> + *
> + * Return status:
> + * a0 INTEL_SIP_SMC_STATUS_OK or INTEL_SIP_SMC_STATUS_ERROR
> + * a1 running firmware version
> + */
> +#define INTEL_SIP_SMC_FUNCID_FIRMWARE_VERSION 31
> +#define INTEL_SIP_SMC_FIRMWARE_VERSION \
> +	INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_FIRMWARE_VERSION)
> +
> +#endif
> diff --git a/include/linux/firmware/intel/stratix10-svc-client.h b/include/linux/firmware/intel/stratix10-svc-client.h
> index 19781b0f..18c1841 100644
> --- a/include/linux/firmware/intel/stratix10-svc-client.h
> +++ b/include/linux/firmware/intel/stratix10-svc-client.h
> @@ -104,6 +104,9 @@ struct stratix10_svc_chan;
>   *
>   * @COMMAND_RSU_DCMF_VERSION: query firmware for the DCMF version, return status
>   * is SVC_STATUS_OK or SVC_STATUS_ERROR
> + *
> + * @COMMAND_FIRMWARE_VERSION: query running firmware version, return status
> + * is SVC_STATUS_OK or SVC_STATUS_ERROR
>   */
>  enum stratix10_svc_command_code {
>  	COMMAND_NOOP = 0,
> @@ -117,6 +120,7 @@ enum stratix10_svc_command_code {
>  	COMMAND_RSU_RETRY,
>  	COMMAND_RSU_MAX_RETRY,
>  	COMMAND_RSU_DCMF_VERSION,
> +	COMMAND_FIRMWARE_VERSION,
>  };
>  
>  /**
> -- 
> 2.7.4
> 

Let's hold off on this patch until we have sorted the rest of this patch
series out. As it stands it doesn't have a in-tree user.

Thanks,
Moritz