linux-kernel - Re: [PATCHv1 4/4] fpga: stratix10-soc: entend driver for bitstream authentication

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Date:   Mon, 16 Nov 2020 08:39:36 -0600
From:   Richard Gong <richard.gong@...ux.intel.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     trix@...hat.com, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, dinguyen@...nel.org,
        sridhar.rajagopal@...el.com, Richard Gong <richard.gong@...el.com>
Subject: Re: [PATCHv1 4/4] fpga: stratix10-soc: entend driver for bitstream
 authentication


Hi Moritz,

On 11/15/20 1:19 PM, Moritz Fischer wrote:
> On Thu, Nov 12, 2020 at 12:06:43PM -0600, richard.gong@...ux.intel.com wrote:
>> From: Richard Gong <richard.gong@...el.com>
>>
>> Exten FPGA manager driver to support FPGA bitstream authentication on
> Nit: Extend

Sorry, I will fix that in version 2.

>> Intel SocFPGA platforms.
>>
>> Signed-off-by: Richard Gong <richard.gong@...el.com>
>> ---
>>   drivers/fpga/stratix10-soc.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/fpga/stratix10-soc.c b/drivers/fpga/stratix10-soc.c
>> index 657a70c..8a59365 100644
>> --- a/drivers/fpga/stratix10-soc.c
>> +++ b/drivers/fpga/stratix10-soc.c
>> @@ -185,7 +185,10 @@ static int s10_ops_write_init(struct fpga_manager *mgr,
>>   	ctype.flags = 0;
>>   	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
>>   		dev_dbg(dev, "Requesting partial reconfiguration.\n");
>> -		ctype.flags |= BIT(COMMAND_RECONFIG_FLAG_PARTIAL);
>> +		ctype.flags |= FPGA_MGR_PARTIAL_RECONFIG;
> I think we had this discussion during the original review of the
> stratix10-soc driver?

Yes, we discussed before.

> 
> Wasn't the point of using the BIT() to not assume alignment of FPGA_MGR
> flags and firmware structure?
> 

Yes, we should use BIT().

> The FPGA_MGR_* bits are kernel internal and can therefore change, it
> would be unfortunate to end up in a situation where this breaks the FW
> interface (assuming firmware uses the value in pass-through which it
> looks like is what is happening).

In that case, I should use the flag defined in stratix10-soc driver driver.

> 
>> +	} else if (info->flags & FPGA_MGR_BITSTREM_AUTHENTICATION) {
>> +		dev_dbg(dev, "Requesting bitstream authentication.\n");
>> +		ctype.flags |= FPGA_MGR_BITSTREM_AUTHENTICATION;
> Do you want to change this to BIT(COMMAND_AUTHENTICATE_BITSTREAM) or
> something like that?

OK, I will change to BIT(COMMAND_AUTHENTICATE_BITSTREAM).

Regards,
Richard

>>   	} else {
>>   		dev_dbg(dev, "Requesting full reconfiguration.\n");
>>   	}
>> -- 
>> 2.7.4
>>
> 
> Thanks,
> Moritz
>