Re: [PATCH 3/3 V3] EDAC, AMD64_EDAC: Add ECC decoding support fornewer F15h models.

[Aravind Gopalakrishnan]

On 8/9/2013 8:18 AM, Borislav Petkov wrote:
>   	}
>   
> @@ -205,8 +209,9 @@ static int amd64_set_scrub_rate(struct mem_ctl_info *mci, u32 bw)
>   	if (boot_cpu_data.x86 == 0xf)
>   		min_scrubrate = 0x0;
>   
> -	/* F15h Erratum #505 */
> -	if (boot_cpu_data.x86 == 0x15)
> +	/* F15h Models 0x00 - 0x0f Erratum #505 */
> +	if (boot_cpu_data.x86 == 0x15 &&
> +		boot_cpu_data.x86_model != 0x30)
> This check leaves holes in the model space:
>
> You want:
>
> 		boot_cpu_data.x86_model < 0x30)
>
> provided everything below 0x30 is affected. But you say models 0x0-0xf
> are only affected, which means:
>
>
> 		boot_cpu_data.x86_model < 0x10)
>
> Please recheck which is it.
>
> >   		f15h_select_dct(pvt, 0);
> >   
> >   	return __amd64_set_scrub_rate(pvt->F3, bw, min_scrubrate);
> > @@ -218,8 +223,9 @@ static int amd64_get_scrub_rate(struct mem_ctl_info *mci)
> >   	u32 scrubval = 0;
> >   	int i, retval = -EINVAL;
> >   
> > -	/* F15h Erratum #505 */
> > -	if (boot_cpu_data.x86 == 0x15)
> > +	/* F15h Models 0x00 - 0x0f Erratum #505 */
> > +	if (boot_cpu_data.x86 == 0x15 &&
> > +		boot_cpu_data.x86_model != 0x30)
> Ditto.
Ok, So - from digging up some history about the bug, looks like this was
'fixed' on F15h Model1h Stepping 1 onwards.
I have now changed the code to only consider CPU's that are below (Model 
1 && Stepping 1)

> drivers/edac/amd64_edac.c: In function âf15_m30h_match_to_this_nodeâ:
> drivers/edac/amd64_edac.c:1552:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
>
> > +	u8 dct_offset_en	= (u8) ((dct_cont_base_reg >> 3) & BIT(0));
> > +	u8 dct_sel		= (u8) ((dct_cont_base_reg >> 4) & 0x7);
> > +	u8 intlv_addr		= dct_sel_interleave_addr(pvt);
> > +	u8 node_id		= dram_dst_node(pvt, range);
> > +	u8 intlv_en		= dram_intlv_en(pvt, range);
> > +
> > +	edac_dbg(1, "(range %d) SystemAddr= 0x%llx Limit=0x%llx\n",
> > +		 range, sys_addr, get_dram_limit(pvt, range));
> â
>
> The rest looks ok.

Ok,
I have removed the compiler warnings now and function-tested it as well. 
(Works fine.)
Sending out changes in  [PATCH 3/3 V4]

Thanks,
-Aravind.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/