[PATCH v13 0/4] cxl, EINJ: Update EINJ for CXL error types

Ben Cheatham
2024-02-20T22:12:06Z

v13 Changes:
- Create new einj-cxl module for EINJ CXL error type functionality
- Rename CONFIG_CXL_EINJ to CONFIG_ACPI_APEI_EINJ_CXL
- Move CONFIG_ACPI_APEI_CXL to be under CONFIG_ACPI_APEI_EINJ (due to
new CONFIG_CXL_BUS dependency)
- Add an optional dependency to CONFIG_CXL_BUS on
CONFIG_ACPI_APEI_EINJ_CXL
- Change pr_warn("EINJ table not found.") to a pr_info() for when/if
EINJ probe fails (Tony)
- Add a clarification that a CXL port needs to be present for CXL
EINJ error types to einj.rst (Davidlohr)

v12 Changes:
- Rebase onto v6.8-rc4
- Squash Kconfig patch into patch 2/3 (Jonathan)
- Change CONFIG_CXL_EINJ from "depends on ACPI_APEI_EINJ >= CXL_BUS"
to "depends on ACPI_APEI_EINJ = CXL_BUS"
- Drop "ACPI, APEI" part of commit message title and use just EINJ
instead (Dan)
- Add protocol error types to "einj_types" documentation (Jonathan)
- Change 0xffff... constants to use GENMASK()
- Drop param* variables and use constants instead in cxl error
inject functions (Jonathan)
- Add is_cxl_error_type() helper function in einj.c (Jonathan)
- Remove a stray function declaration in einj-cxl.h (Jonathan)
- Comment #else/#endifs with corresponding #if/#ifdef in
einj-cxl.h (Jonathan)

The new CXL error types will use the Memory Address field in the
SET_ERROR_TYPE_WITH_ADDRESS structure in order to target a CXL 1.1
compliant memory-mapped downstream port. The value of the memory address
will be in the port's MMIO range, and it will not represent physical
(normal or persistent) memory.

Add the functionality for injecting CXL 1.1 errors to the EINJ module,
but not through the EINJ legacy interface under /sys/kernel/debug/apei/einj.
Instead, make the error types available under /sys/kernel/debug/cxl.
This allows for validating the MMIO address for a CXL 1.1 error type
while also not making the user responsible for finding it.

Ben Cheatham (4):
EINJ: Migrate to a platform driver
EINJ: Add CXL error type support
cxl/core: Add CXL EINJ debugfs files
EINJ, Documentation: Update EINJ kernel doc

Documentation/ABI/testing/debugfs-cxl | 30 +++++
.../firmware-guide/acpi/apei/einj.rst | 21 +++
MAINTAINERS | 1 +
drivers/acpi/apei/Kconfig | 12 ++
drivers/acpi/apei/Makefile | 1 +
drivers/acpi/apei/apei-internal.h | 17 +++
drivers/acpi/apei/einj-cxl.c | 121 +++++++++++++++++
drivers/acpi/apei/einj.c | 127 ++++++++++++++----
drivers/cxl/Kconfig | 1 +
drivers/cxl/core/port.c | 41 ++++++
include/linux/einj-cxl.h | 40 ++++++
11 files changed, 385 insertions(+), 27 deletions(-)
create mode 100644 drivers/acpi/apei/einj-cxl.c
create mode 100644 include/linux/einj-cxl.h

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2.34.1