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cxl/memdev: Replace ENXIO with EBUSY for inject poison limit reached

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The CXL driver provides a debugfs interface offering users the
ability to inject and clear poison to a memdev. Once a user has
injected up to the devices limit further injection requests fail
with ENXIO until a clear poison is issued.

Users may not have device specs in hand or may want to intentionally
hit the limit and then clear. Replace the usual ENXIO return status
with EBUSY so users can recognize this failure.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Tested-by: Xingtao Yao <yaoxt.fnst@fujitsu.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://patch.msgid.link/825bd4c67fb55a4373c4182d999ad49d4e6b4fe7.1720316188.git.alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Alison Schofield 2024-07-06 18:53:43 -07:00 committed by Dave Jiang
parent bebfbbaffc
commit 591209c798
2 changed files with 5 additions and 4 deletions
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7
Documentation/ABI/testing/debugfs-cxl
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@ -14,9 +14,10 @@ Description:
event to its internal Informational Event log, updates the
Event Status register, and if configured, interrupts the host.
It is not an error to inject poison into an address that
already has poison present and no error is returned. The
inject_poison attribute is only visible for devices supporting
the capability.
already has poison present and no error is returned. If the
device returns 'Inject Poison Limit Reached' an -EBUSY error
is returned to the user. The inject_poison attribute is only
visible for devices supporting the capability.
What: /sys/kernel/debug/memX/clear_poison

2
drivers/cxl/cxlmem.h
View File

@ -161,7 +161,7 @@ struct cxl_mbox_cmd {
C(FWRESET, -ENXIO, "FW failed to activate, needs cold reset"), \
C(HANDLE, -ENXIO, "one or more Event Record Handles were invalid"), \
C(PADDR, -EFAULT, "physical address specified is invalid"), \
C(POISONLMT, -ENXIO, "poison injection limit has been reached"), \
C(POISONLMT, -EBUSY, "poison injection limit has been reached"), \
C(MEDIAFAILURE, -ENXIO, "permanent issue with the media"), \
C(ABORT, -ENXIO, "background cmd was aborted by device"), \
C(SECURITY, -ENXIO, "not valid in the current security state"), \