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From: "Chatradhi, Naveen Krishna" <NaveenKrishna.Chatradhi@amd.com>
To: "Ghannam, Yazen" <Yazen.Ghannam@amd.com>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"bp@alien8.de" <bp@alien8.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"mchehab@kernel.org" <mchehab@kernel.org>
Subject: RE: [PATCH 4/7] EDAC/mce_amd: extract node id from InstanceHi in IPID
Date: Tue, 10 Aug 2021 12:45:22 +0000	[thread overview]
Message-ID: <BL1PR12MB52866A0EDF20FC659EA6979CE8F79@BL1PR12MB5286.namprd12.prod.outlook.com> (raw)
In-Reply-To: <20210729163245.GA4318@aus-x-yghannam.amd.com>

[Public]

Hi Yazen

-----Original Message-----
From: Ghannam, Yazen <Yazen.Ghannam@amd.com> 
Sent: Thursday, July 29, 2021 10:03 PM
To: Chatradhi, Naveen Krishna <NaveenKrishna.Chatradhi@amd.com>
Cc: linux-edac@vger.kernel.org; x86@kernel.org; linux-kernel@vger.kernel.org; bp@alien8.de; mingo@redhat.com; mchehab@kernel.org
Subject: Re: [PATCH 4/7] EDAC/mce_amd: extract node id from InstanceHi in IPID

On Wed, Jun 30, 2021 at 08:58:25PM +0530, Naveen Krishna Chatradhi wrote:
> On AMD systems with SMCA banks on NONCPU nodes, the node id 
> information is available in the InstanceHI[47:44] of the IPID register.

The doesn't read well to me. I saw this as saying "bits 47:44 of the InstanceHi register". Also, the name of the field is "InstanceIdHi" in the documentation.

I think it'd be more clear to say "available in MCA_IPID[47:44] (InstanceIdHi)" or something similar. 
[naveenk:] Modified the commit message

> 
> Signed-off-by: Muralidhara M K <muralimk@amd.com>
> Signed-off-by: Naveen Krishna Chatradhi <nchatrad@amd.com>
> ---
>  drivers/edac/mce_amd.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c index 
> 27d56920b469..364dfb6e359d 100644
> --- a/drivers/edac/mce_amd.c
> +++ b/drivers/edac/mce_amd.c
> @@ -1049,6 +1049,7 @@ static void decode_smca_error(struct mce *m)
>  	enum smca_bank_types bank_type;
>  	const char *ip_name;
>  	u8 xec = XEC(m->status, xec_mask);
> +	u32 node_id = 0;

Why u32? Why not u16 to match topology_die_id() or int to match decode_dram_ecc()?
[naveenk:] Done, used int.

>  
>  	if (m->bank >= ARRAY_SIZE(smca_banks))
>  		return;
> @@ -1072,8 +1073,18 @@ static void decode_smca_error(struct mce *m)
>  	if (xec < smca_mce_descs[bank_type].num_descs)
>  		pr_cont(", %s.\n", smca_mce_descs[bank_type].descs[xec]);
>  
> -	if (bank_type == SMCA_UMC && xec == 0 && decode_dram_ecc)
> -		decode_dram_ecc(topology_die_id(m->extcpu), m);
> +	/*
> +	 * SMCA_UMC_V2 is used on the noncpu nodes, extract the node id
> +	 * from the InstanceHI[47:44] of the IPID register.
> +	 */
> +	if (bank_type == SMCA_UMC_V2 && xec == 0)
> +		node_id = ((m->ipid >> 44) & 0xF);
> +
> +	if (bank_type == SMCA_UMC && xec == 0)
> +		node_id = topology_die_id(m->extcpu);
> +
> +	if (decode_dram_ecc)
> +		decode_dram_ecc(node_id, m);

If decode_dram_ecc() is set, then this will call it on every MCA error that comes in. Rather we only want to call it on DRAM ECC errors.

You could do something like this:

	if (decode_dram_ecc && xec == 0) {
		u32 node_id = 0;

		if (bank_type == SMCA_UMC)
			node_id = XXX;
		else if (bank_type == SMCA_UMC_V2)
			node_id = YYY;
		else
			return;

		decode_dram_ecc(node_id, m);
	}

This is just an example. Maybe you can save an indentation level by negating those conditions and returning early, etc.
[naveenk:] modified the ladder.

Thanks,
Yazen
[naveenk:] Thank you.

  reply	other threads:[~2021-08-10 12:45 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-30 15:28 [PATCH 0/7] x86/edac/amd64: Add support for noncpu nodes Naveen Krishna Chatradhi
2021-06-30 15:28 ` [PATCH 1/7] x86/amd_nb: Add Aldebaran device to PCI IDs Naveen Krishna Chatradhi
2021-07-19 19:28   ` Yazen Ghannam
2021-08-10 12:45     ` Chatradhi, Naveen Krishna
2021-08-10 13:54       ` Borislav Petkov
2021-06-30 15:28 ` [PATCH 2/7] x86/amd_nb: Add support for northbridges on Aldebaran Naveen Krishna Chatradhi
2021-07-19 20:25   ` Yazen Ghannam
2021-08-10 12:45     ` Chatradhi, Naveen Krishna
2021-06-30 15:28 ` [PATCH 3/7] EDAC/mc: Add new HBM2 memory type Naveen Krishna Chatradhi
2021-07-19 20:47   ` Yazen Ghannam
2021-07-19 21:16     ` Luck, Tony
2021-07-20 12:13       ` Zhuo, Qiuxu
2021-07-20 16:30         ` [PATCH] EDAC/skx_common: Set the memory type correctly for HBM memory Luck, Tony
2021-07-20 16:33     ` [PATCH 3/7] EDAC/mc: Add new HBM2 memory type Luck, Tony
2021-06-30 15:28 ` [PATCH 4/7] EDAC/mce_amd: extract node id from InstanceHi in IPID Naveen Krishna Chatradhi
2021-07-29 16:32   ` Yazen Ghannam
2021-08-10 12:45     ` Chatradhi, Naveen Krishna [this message]
2021-06-30 15:28 ` [PATCH 5/7] EDAC/amd64: Enumerate memory on noncpu nodes Naveen Krishna Chatradhi
2021-07-29 17:55   ` Yazen Ghannam
2021-08-10 12:49     ` Chatradhi, Naveen Krishna
2021-06-30 15:28 ` [PATCH 6/7] EDAC/amd64: Add address translation support for DF3.5 Naveen Krishna Chatradhi
2021-07-29 17:59   ` Yazen Ghannam
2021-07-29 18:13     ` Chatradhi, Naveen Krishna
2021-06-30 15:28 ` [PATCH 7/7] EDAC/amd64: Add fixed UMC to CS mapping Naveen Krishna Chatradhi
2021-08-06  7:43 ` [PATCH v2 0/3] x86/edac/amd64: Add support for noncpu nodes Naveen Krishna Chatradhi
2021-08-06  7:43   ` [PATCH v2 1/3] x86/amd_nb: Add support for northbridges on Aldebaran Naveen Krishna Chatradhi
2021-08-20 15:36     ` Yazen Ghannam
2021-08-06  7:43   ` [PATCH v2 2/3] EDAC/mce_amd: Extract node id from InstanceHi in IPID Naveen Krishna Chatradhi
2021-08-20 15:43     ` Yazen Ghannam
2021-08-06  7:43   ` [PATCH v2 3/3] EDAC/amd64: Enumerate memory on noncpu nodes Naveen Krishna Chatradhi
2021-08-20 17:02     ` Yazen Ghannam
2021-08-23 16:56       ` Chatradhi, Naveen Krishna
2021-08-23 18:54     ` [PATCH v3 0/3] x86/edac/amd64: Add support for " Naveen Krishna Chatradhi
2021-08-23 18:54       ` [PATCH v3 1/3] x86/amd_nb: Add support for northbridges on Aldebaran Naveen Krishna Chatradhi
2021-08-25 10:42         ` Borislav Petkov
2021-09-01 18:17           ` Yazen Ghannam
2021-09-02 17:30             ` Borislav Petkov
2021-09-13 18:07               ` Yazen Ghannam
2021-09-16 16:36                 ` Borislav Petkov
2021-10-11 14:26           ` Chatradhi, Naveen Krishna
2021-10-11 18:08             ` Borislav Petkov
2021-08-23 18:54       ` [PATCH v3 2/3] EDAC/mce_amd: Extract node id from MCA_IPID Naveen Krishna Chatradhi
2021-08-27 10:24         ` Borislav Petkov
2021-09-01 18:18           ` Yazen Ghannam
2021-08-23 18:54       ` [PATCH v3 3/3] EDAC/amd64: Enumerate memory on noncpu nodes Naveen Krishna Chatradhi
2021-08-27 11:30         ` Borislav Petkov
2021-09-01 18:42           ` Yazen Ghannam
2021-09-08 18:41             ` Borislav Petkov
2021-09-13 18:19               ` Yazen Ghannam
2021-10-14 18:50       ` [PATCH v4 0/4] x86/edac/amd64: Add support for " Naveen Krishna Chatradhi
2021-10-14 18:50         ` [PATCH v4 1/4] x86/amd_nb: Add support for northbridges on Aldebaran Naveen Krishna Chatradhi
2021-10-14 18:50         ` [PATCH v4 2/4] EDAC/mce_amd: Extract node id from MCA_IPID Naveen Krishna Chatradhi
2021-10-14 18:50         ` [PATCH 3/4] EDAC/amd64: Extend family ops functions Naveen Krishna Chatradhi
2021-10-14 18:50         ` [PATCH 4/4] EDAC/amd64: Enumerate memory on Aldebaran GPU nodes Naveen Krishna Chatradhi
2021-10-14 18:53       ` [PATCH v4 0/4] x86/edac/amd64: Add support for noncpu nodes Naveen Krishna Chatradhi
2021-10-14 18:53         ` [PATCH v4 1/4] x86/amd_nb: Add support for northbridges on Aldebaran Naveen Krishna Chatradhi
2021-10-21 15:52           ` Yazen Ghannam
2021-10-14 18:53         ` [PATCH v4 2/4] EDAC/mce_amd: Extract node id from MCA_IPID Naveen Krishna Chatradhi
2021-10-21 15:55           ` Yazen Ghannam
2021-10-14 18:53         ` [PATCH v4 3/4] EDAC/amd64: Extend family ops functions Naveen Krishna Chatradhi
2021-10-21 16:27           ` Yazen Ghannam
2021-10-14 18:54         ` [PATCH v4 4/4] EDAC/amd64: Enumerate memory on Aldebaran GPU nodes Naveen Krishna Chatradhi
2021-10-21 16:40           ` Yazen Ghannam
2021-10-14 19:53         ` [PATCH v4 0/4] x86/edac/amd64: Add support for noncpu nodes Borislav Petkov
2021-10-15 12:18           ` Chatradhi, Naveen Krishna
2021-10-15 19:25             ` Borislav Petkov
2021-08-20 17:07   ` [PATCH v2 0/3] " Yazen Ghannam

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