cxl/core: Fix cxl_dport debugfs EINJ entries

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[ Upstream commit 4ed7952b9e ]

Protocol error injection is only valid for CXL 2.0+ root ports and CXL
1.1 memory-mapped downstream ports as per the ACPI v6.5 spec (Table
8-31). The core code currently creates an 'einj_inject' file in CXL debugfs
for all CXL 1.1 downstream ports and all PCI CXL 2.0+ downstream ports.
This results in debugfs EINJ files that won't work due to platform/spec
restrictions.

Fix by limiting 'einj_inject' file creation to only CXL 1.1 dports and
CXL 2.0+ root ports. Update the comment above the check to more accurately
represent the requirements expected by the EINJ module and ACPI spec.

Fixes: 8039804cfa ("cxl/core: Add CXL EINJ debugfs files")
Signed-off-by: Ben Cheatham <Benjamin.Cheatham@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/6e9fb657-8264-4028-92e2-5428e2695bf1@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Cheatham, Benjamin 2026-01-09 07:57:38 -06:00 • committed by Greg Kroah-Hartman

parent 055cd68b8e

commit 02f720109f

1 changed files with 5 additions and 3 deletions

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drivers/cxl/core/port.c

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