linux-kernel - Re: [PATCH] edac, amd64_edac: Modify usage of amd64_read_dct_pci

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Date:	Tue, 26 Aug 2014 12:35:57 -0500
From:	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>
To:	Borislav Petkov <bp@...en8.de>
CC:	<dougthompson@...ssion.com>, <m.chehab@...sung.com>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] edac, amd64_edac: Modify usage of amd64_read_dct_pci_cfg()

On 8/25/2014 12:43 AM, Borislav Petkov wrote:
> On Thu, Aug 21, 2014 at 05:19:46PM -0500, Aravind Gopalakrishnan wrote:
>> @@ -767,17 +750,25 @@ static void read_dct_base_mask(struct amd64_pvt *pvt)
>>   		int reg1   = DCSB1 + (cs * 4);
>>   		u32 *base0 = &pvt->csels[0].csbases[cs];
>>   		u32 *base1 = &pvt->csels[1].csbases[cs];
>> +		u8 dct = 0;
>>   
>> -		if (!amd64_read_dct_pci_cfg(pvt, reg0, base0))
>> +		if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, base0))
>>   			edac_dbg(0, "  DCSB0[%d]=0x%08x reg: F2x%x\n",
>>   				 cs, *base0, reg0);
>>   
>> -		if (pvt->fam == 0xf || dct_ganging_enabled(pvt))
>> +		if (pvt->fam == 0xf) {
>>   			continue;
>> -
>> -		if (!amd64_read_dct_pci_cfg(pvt, reg1, base1))
>> -			edac_dbg(0, "  DCSB1[%d]=0x%08x reg: F2x%x\n",
>> -				 cs, *base1, reg1);
>> +		} else if (pvt->fam == 0x10 && !dct_ganging_enabled(pvt)) {
>> +			if (!amd64_read_pci_cfg(pvt->F2, reg1, base1))
>> +				edac_dbg(0, "  DCSB1[%d]=0x%08x reg: F2x%x\n",
>> +					 cs, *base1, reg1);
>> +		} else {
>> +			dct = ((pvt->fam == 0x15)
>> +				&& (pvt->model == 0x30)) ? 3 : 1;
>> +			if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, base1))
>> +				edac_dbg(0, "  DCSB1[%d]=0x%08x reg: F2x%x\n",
>> +					 cs, *base1, reg0);
>> +		}
>>   	}
>>   
>>   	for_each_chip_select_mask(cs, 0, pvt) {
>> @@ -785,17 +776,25 @@ static void read_dct_base_mask(struct amd64_pvt *pvt)
>>   		int reg1   = DCSM1 + (cs * 4);
>>   		u32 *mask0 = &pvt->csels[0].csmasks[cs];
>>   		u32 *mask1 = &pvt->csels[1].csmasks[cs];
>> +		u8 dct = 0;
>>   
>> -		if (!amd64_read_dct_pci_cfg(pvt, reg0, mask0))
>> +		if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, mask0))
>>   			edac_dbg(0, "    DCSM0[%d]=0x%08x reg: F2x%x\n",
>>   				 cs, *mask0, reg0);
>>   
>> -		if (pvt->fam == 0xf || dct_ganging_enabled(pvt))
>> +		if (pvt->fam == 0xf) {
>>   			continue;
>> -
>> -		if (!amd64_read_dct_pci_cfg(pvt, reg1, mask1))
>> -			edac_dbg(0, "    DCSM1[%d]=0x%08x reg: F2x%x\n",
>> -				 cs, *mask1, reg1);
>> +		} else if (pvt->fam == 0x10 && !dct_ganging_enabled(pvt)) {
>> +			if (!amd64_read_pci_cfg(pvt->F2, reg1, mask1))
>> +				edac_dbg(0, "    DCSM1[%d]=0x%08x reg: F2x%x\n",
>> +					 cs, *mask1, reg1);
>> +		} else {
>> +			dct = ((pvt->fam == 0x15)
>> +				&& (pvt->model == 0x30)) ? 3 : 1;
>> +			if (!amd64_read_dct_pci_cfg(pvt, dct, reg0, mask1))
>> +				edac_dbg(0, "    DCSM1[%d]=0x%08x reg: F2x%x\n",
>> +					 cs, *mask1, reg0);
>> +		}
> This is almost unreadable now with all the family checks everywhere.
> You need to hide all that per-family logic into the function and have a
> single
>
> amd_read_pci_cfg_dct(pvt, dct, ...)
>
> which contains all that logic. Calling code doesn't need to care about
> details like on which family it is running, etc, etc.
>

Ok, I have addressed this issue and the use of 'boot_cpu_data' that you 
mentioned on separate reply.
Sending it out as V2.

Thanks,
-Aravind.
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