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cxl/pmem: Add "Unlock" security command support

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Create callback function to support the nvdimm_security_ops() ->unlock()
callback. Translate the operation to send "Unlock" security command for CXL
mem device.

When the mem device is unlocked, cpu_cache_invalidate_memregion() is called
in order to invalidate all CPU caches before attempting to access the mem
device.

See CXL rev3.0 spec section 8.2.9.8.6.4 for reference.

Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166983614167.2734609.15124543712487741176.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang
2022-11-30 12:22:21 -07:00
committed by Dan Williams
parent 410926e9d7
commit 2bb692f7a6
4 changed files with 30 additions and 0 deletions
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1
include/uapi/linux/cxl_mem.h
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@@ -45,6 +45,7 @@
___C(SET_PASSPHRASE, "Set Passphrase"), \
___C(DISABLE_PASSPHRASE, "Disable Passphrase"), \
___C(FREEZE_SECURITY, "Freeze Security"), \
___C(UNLOCK, "Unlock"), \
___C(MAX, "invalid / last command")
#define ___C(a, b) CXL_MEM_COMMAND_ID_##a