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SubjectRe: [PATCH 2/3 V2] EDAC, AMD64_EDAC: Add relevant condition checks as F15h M30h does not support GART or L3.
On 8/6/2013 3:19 PM, Borislav Petkov wrote:
> On Fri, Aug 02, 2013 at 05:43:03PM -0500, Aravind Gopalakrishnan wrote:
>> Adding code to check for specific model (F15h, M30h) and if yes,
>> do not add flag AMD_NB_GART. Also check cpuid_edx(0x80000006) for
>> prescence of L3. If no L3, do not add any L3 flags.
>>
>> Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
>>
>> diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
>> index 3048ded..3ee7a4d 100644
>> --- a/arch/x86/kernel/amd_nb.c
>> +++ b/arch/x86/kernel/amd_nb.c
>> @@ -20,6 +20,7 @@ const struct pci_device_id amd_nb_misc_ids[] = {
>> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
>> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
>> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
>> + { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
>> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
>> {}
>> };
>> @@ -27,6 +28,7 @@ EXPORT_SYMBOL(amd_nb_misc_ids);
>>
>> static const struct pci_device_id amd_nb_link_ids[] = {
>> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
>> + { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
>> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
>> {}
>> };
>> @@ -81,13 +83,21 @@ int amd_cache_northbridges(void)
>> next_northbridge(misc, amd_nb_misc_ids);
>> node_to_amd_nb(i)->link = link =
>> next_northbridge(link, amd_nb_link_ids);
>> - }
>> + }
>>
>> + /* GART present only on Fam15h upto model 0fh */
>> if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
>> - boot_cpu_data.x86 == 0x15)
>> + (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model < 0x10))
>> amd_northbridges.flags |= AMD_NB_GART;
>>
>> /*
>> + * Check CPUID Fn8000_0006_EDX: L3 Cache Identifiers.
>> + * If == 0, then no need to proceed as there is no L3.
> This comment explains the code. Just sit down and think about it: does
> it make any sense to have that in a comment?
>> + */
>> + if (cpuid_edx(0x80000006) == 0)
>> + return 0;
>> +
>> + /*
>> * Some CPU families support L3 Cache Index Disable. There are some
>> * limitations because of E382 and E388 on family 0x10.
>> */
>> --
> I fixed it up like this:
>
> commit a0cb1bab68823648def0fda19bf307ad08eb25d2
> Author: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
> Date: Fri Aug 2 17:43:03 2013 -0500
>
> x86, amd_nb: Clarify F15h, model 30h GART and L3 support
>
> F15h, models 0x30 and later don't have a GART. Note that. Also check
> cpuid_edx(0x80000006) for prescence of L3 because there are models which
> don't sport an L3.
>
> Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
> [ Boris: rewrite commit message, cleanup comments. ]
> Signed-off-by: Borislav Petkov <bp@suse.de>

Okay, Thanks!
> diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
> index 3048ded1b598..59554dca96ec 100644
> --- a/arch/x86/kernel/amd_nb.c
> +++ b/arch/x86/kernel/amd_nb.c
> @@ -20,6 +20,7 @@ const struct pci_device_id amd_nb_misc_ids[] = {
> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
> + { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
> {}
> };
> @@ -27,6 +28,7 @@ EXPORT_SYMBOL(amd_nb_misc_ids);
>
> static const struct pci_device_id amd_nb_link_ids[] = {
> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
> + { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
> { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
> {}
> };
> @@ -81,13 +83,20 @@ int amd_cache_northbridges(void)
> next_northbridge(misc, amd_nb_misc_ids);
> node_to_amd_nb(i)->link = link =
> next_northbridge(link, amd_nb_link_ids);
> - }
> + }
>
> + /* GART present only on Fam15h upto model 0fh */
> if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
> - boot_cpu_data.x86 == 0x15)
> + (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model < 0x10))
> amd_northbridges.flags |= AMD_NB_GART;
>
> /*
> + * Check for L3 cache presence.
> + */
> + if (!cpuid_edx(0x80000006))
> + return 0;
> +
> + /*
> * Some CPU families support L3 Cache Index Disable. There are some
> * limitations because of E382 and E388 on family 0x10.
> */
>
>
>




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