linux-kernel - [PATCH 1/3] cxl/memdev: Improve sanitize ABI descriptions

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Date: Mon, 22 Apr 2024 07:01:21 +0000
From: Dongsheng Yang <dongsheng.yang@...ystack.cn>
To: dan.j.williams@...el.com,
	axboe@...nel.dk
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-cxl@...r.kernel.org,
	Davidlohr Bueso <dave@...olabs.net>,
	Dave Jiang <dave.jiang@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>
Subject: [PATCH 1/3] cxl/memdev: Improve sanitize ABI descriptions

From: Davidlohr Bueso <dave@...olabs.net>

Be more detailed about the CPU cache management situation. The same
goes for both sanitize and secure erase.

Signed-off-by: Davidlohr Bueso <dave@...olabs.net>
Link: https://lore.kernel.org/r/20230726051940.3570-2-dave@stgolabs.net
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
---
 Documentation/ABI/testing/sysfs-bus-cxl | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
index 6350dd82b9a9..c4c4acb1f3b3 100644
--- a/Documentation/ABI/testing/sysfs-bus-cxl
+++ b/Documentation/ABI/testing/sysfs-bus-cxl
@@ -82,7 +82,11 @@ Description:
 		whether it resides in persistent capacity, volatile capacity,
 		or the LSA, is made permanently unavailable by whatever means
 		is appropriate for the media type. This functionality requires
-		the device to be not be actively decoding any HPA ranges.
+		the device to be disabled, that is, not actively decoding any
+		HPA ranges. This permits avoiding explicit global CPU cache
+		management, relying instead for it to be done when a region
+		transitions between software programmed and hardware committed
+		states.
 
 
 What            /sys/bus/cxl/devices/memX/security/erase
@@ -92,7 +96,12 @@ Contact:        linux-cxl@...r.kernel.org
 Description:
 		(WO) Write a boolean 'true' string value to this attribute to
 		secure erase user data by changing the media encryption keys for
-		all user data areas of the device.
+		all user data areas of the device. This functionality requires
+		the device to be disabled, that is, not actively decoding any
+		HPA ranges. This permits avoiding explicit global CPU cache
+		management, relying instead for it to be done when a region
+		transitions between software programmed and hardware committed
+		states.
 
 
 What:		/sys/bus/cxl/devices/memX/firmware/
-- 
2.34.1