linux-kernel - [PATCH v3 0/2] efi/cxl-cper: Report CXL CPER events through tracing

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Message-Id: <20240426-cxl-cper3-v3-0-6ade7dfc849e@intel.com>
Date: Fri, 26 Apr 2024 13:02:58 -0700
From: Ira Weiny <ira.weiny@...el.com>
To: Dave Jiang <dave.jiang@...el.com>, 
 Dan Williams <dan.j.williams@...el.com>, 
 Jonathan Cameron <jonathan.cameron@...wei.com>, 
 Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>, 
 Shiju Jose <shiju.jose@...wei.com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>, 
 Yazen Ghannam <yazen.ghannam@....com>, Davidlohr Bueso <dave@...olabs.net>, 
 Alison Schofield <alison.schofield@...el.com>, 
 Vishal Verma <vishal.l.verma@...el.com>, Ard Biesheuvel <ardb@...nel.org>, 
 linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-cxl@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Tony Luck <tony.luck@...el.com>, 
 Borislav Petkov <bp@...en8.de>
Subject: [PATCH v3 0/2] efi/cxl-cper: Report CXL CPER events through
 tracing

If a device is configured for firmware first CXL event records are not
sent directly to the host, rather they are reported through the EFI
Common Platform Error Records (CPER).  EFI 2.10 Section N.2.14 defines
the CXL CPER to wrap a mostly CXL event payload.

The CXL sub-system uniquely has DPA to HPA translation information.[0]
It also already has event decoding/tracing.  Such translations are very
useful for users to determine which system issues may correspond to
specific hardware events.

The restructuring of the event data structures in 6.8 made sharing the
data between CPER/event logs more efficient.  Now re-wire the sending of
CPER records to the CXL sub-system.

Series status/background
========================

Smita and Jonathan have been a great help with this series.  Once again
thank you.

Unfortunately, with all the churn surrounding the bug which Dan
Carpenter found the maintainers were force to revert this work.

Testing
=======

Continue to use my quick hack in debugfs to facilitate easier testing.[1]

[0]
Link: https://lore.kernel.org/all/cover.1711598777.git.alison.schofield@intel.com/
[1]
Link: https://github.com/weiny2/linux-kernel/commit/9b1f33314e8488506dbad63dc1c896386d4803d6

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
Changes in v3:
- djbw: drop patch which traces errors if CXL is not loaded
- djbw: Let CXL layer declare work struct.  Leave kfifo management in
  GHES layer
- Link to v2: https://lore.kernel.org/r/20240422-cxl-cper3-v2-0-5cdd378fcd0b@intel.com

---
Ira Weiny (2):
      acpi/ghes: Process CXL Component Events
      cxl/pci: Process CPER events

 drivers/acpi/apei/ghes.c  | 110 ++++++++++++++++++++++++++++++++++++++++++++++
 drivers/cxl/pci.c         |  71 +++++++++++++++++++++++++++++-
 include/linux/cxl-event.h |  27 ++++++++++++
 3 files changed, 207 insertions(+), 1 deletion(-)
---
base-commit: e33c4963bf536900f917fb65a687724d5539bc21
change-id: 20240220-cxl-cper3-30e55279f936

Best regards,
-- 
Ira Weiny <ira.weiny@...el.com>