linux-edac.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Yazen Ghannam <yazen.ghannam@amd.com>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org,
	mchehab@kernel.org, tony.luck@intel.com,
	Smita.KoralahalliChannabasappa@amd.com
Subject: Re: [PATCH v2 04/31] EDAC/amd64: Allow for DF Indirect Broadcast reads
Date: Thu, 8 Jul 2021 15:44:08 -0400	[thread overview]
Message-ID: <20210708194408.GB15605@aus-x-yghannam.amd.com> (raw)
In-Reply-To: <YNyaXr9yfi/paLt/@zn.tnic>

On Wed, Jun 30, 2021 at 06:22:54PM +0200, Borislav Petkov wrote:
> On Wed, Jun 23, 2021 at 07:19:35PM +0000, Yazen Ghannam wrote:
> > The DF Indirect Access method allows for "Broadcast" accesses in which
> > case no specific instance is targeted. Add support using a reserved
> > instance ID of 0xFF to indicate a broadcast access. Set the FICAA
> > register appropriately.
> > 
> > Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
> > ---
> > Link:
> > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.kernel.org%2Fr%2F20210507190140.18854-1-Yazen.Ghannam%40amd.com&amp;data=04%7C01%7Cyazen.ghannam%40amd.com%7C83af21ab3dcc4b529ff008d93be354cb%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637606669851041887%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=DVzJaZy8OOETbvcISwzhg7%2FP3iHjOiP%2BOgMFd8rrrQk%3D&amp;reserved=0
> > 
> > v1->v2:
> > * New in v2.
> > 
> >  drivers/edac/amd64_edac.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> > index b94067e3952b..d67cd8f57b94 100644
> > --- a/drivers/edac/amd64_edac.c
> > +++ b/drivers/edac/amd64_edac.c
> > @@ -1010,7 +1010,11 @@ struct df_reg {
> >   *
> >   * Fabric Indirect Configuration Access Data (FICAD): There are FICAD LO
> >   * and FICAD HI registers but so far we only need the LO register.
> > + *
> > + * Use Instance Id 0xFF to indicate a broadcast read.
> >   */
> > +
> > +#define DF_BROADCAST	0xFF
> >  static int amd_df_indirect_read(u16 node, struct df_reg reg, u8 instance_id, u32 *lo)
> >  {
> >  	struct pci_dev *F4;
> > @@ -1024,7 +1028,7 @@ static int amd_df_indirect_read(u16 node, struct df_reg reg, u8 instance_id, u32
> >  	if (!F4)
> >  		goto out;
> >  
> > -	ficaa  = 1;
> > +	ficaa  = (instance_id == DF_BROADCAST) ? 0 : 1;
> 
> Or, you can define two functions:
> 
> df_indirect_read_broadcast()
> df_indirect_read_umc()
> 
> (no need for the "amd_" prefix either - this is a static function now)
> 
> which both call a low-level helper:
> 
> static int __df_indirect_read(u16 node, struct df_reg reg, u8 instance_id, u32 *lo)
> 
> and there you either pass the instance_id or 0xff depending on which
> outer function is calling it...
>

Yeah, I like it. I'll see what I can do.

BTW, I'm thinking to include a "tmp" or "scratch" u32 value in the
context used to hold raw register values that don't need to be saved
long term. There are a few places where a value is read and some fields
are extracted, so a few functions have a u32 tmp variable declared. What
do you think?

Thanks,
Yazen

  reply	other threads:[~2021-07-08 19:44 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-23 19:19 [PATCH v2 00/31] AMD MCA Address Translation Updates Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 01/31] x86/MCE/AMD, EDAC/amd64: Move address translation to AMD64 EDAC Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 02/31] x86/amd_nb, EDAC/amd64: Move DF Indirect Read " Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 03/31] EDAC/amd64: Don't use naked values for DF registers Yazen Ghannam
2021-06-25 15:21   ` Borislav Petkov
2021-07-08 19:35     ` Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 04/31] EDAC/amd64: Allow for DF Indirect Broadcast reads Yazen Ghannam
2021-06-30 16:22   ` Borislav Petkov
2021-07-08 19:44     ` Yazen Ghannam [this message]
2021-06-23 19:19 ` [PATCH v2 05/31] EDAC/amd64: Add context struct Yazen Ghannam
2021-06-30 17:17   ` Borislav Petkov
2021-07-08 19:53     ` Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 06/31] EDAC/amd64: Define Data Fabric operations Yazen Ghannam
2021-06-30 17:19   ` Borislav Petkov
2021-07-08 19:55     ` Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 07/31] EDAC/amd64: Define functions for DramOffset Yazen Ghannam
2021-06-30 17:27   ` Borislav Petkov
2021-07-08 20:08     ` Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 08/31] EDAC/amd64: Define function to read DRAM address map registers Yazen Ghannam
2021-06-30 17:29   ` Borislav Petkov
2021-06-23 19:19 ` [PATCH v2 09/31] EDAC/amd64: Define function to find interleaving mode Yazen Ghannam
2021-06-30 17:33   ` Borislav Petkov
2021-07-08 20:09     ` Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 10/31] EDAC/amd64: Define function to denormalize address Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 11/31] EDAC/amd64: Define function to add DRAM base and hole Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 12/31] EDAC/amd64: Define function to dehash address Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 13/31] EDAC/amd64: Define function to check DRAM limit address Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 14/31] EDAC/amd64: Remove goto statements Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 15/31] EDAC/amd64: Simplify function parameters Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 16/31] EDAC/amd64: Define function to get Interleave Address Bit Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 17/31] EDAC/amd64: Skip denormalization if no interleaving Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 18/31] EDAC/amd64: Define function to get number of interleaved channels Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 19/31] EDAC/amd64: Define function to get number of interleaved dies Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 20/31] EDAC/amd64: Define function to get number of interleaved sockets Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 21/31] EDAC/amd64: Remove unnecessary assert Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 22/31] EDAC/amd64: Define function to make space for CS ID Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 23/31] EDAC/amd64: Define function to calculate " Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 24/31] EDAC/amd64: Define function to insert CS ID into address Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 25/31] EDAC/amd64: Define function to get CS Fabric ID Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 26/31] EDAC/amd64: Define function to find shift and mask values Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 27/31] EDAC/amd64: Update CS ID calculation to match reference code Yazen Ghannam
2021-06-23 19:19 ` [PATCH v2 28/31] EDAC/amd64: Match hash function to " Yazen Ghannam
2021-06-23 19:20 ` [PATCH v2 29/31] EDAC/amd64: Define helper function to get interleave address select bit Yazen Ghannam
2021-06-23 19:20 ` [PATCH v2 30/31] EDAC/amd64: Add support for address translation on DF3 systems Yazen Ghannam
2021-06-23 19:20 ` [PATCH v2 31/31] EDAC/amd64: Add glossary of acronyms for address translation Yazen Ghannam

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210708194408.GB15605@aus-x-yghannam.amd.com \
    --to=yazen.ghannam@amd.com \
    --cc=Smita.KoralahalliChannabasappa@amd.com \
    --cc=bp@alien8.de \
    --cc=linux-edac@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mchehab@kernel.org \
    --cc=tony.luck@intel.com \
    --subject='Re: [PATCH v2 04/31] EDAC/amd64: Allow for DF Indirect Broadcast reads' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).