linux-kernel - [PATCH v2 13/16] mmc: Documentation: Add sysfs ABI for hpi_time

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Date:	Thu, 3 May 2012 19:53:12 +0530
From:	Venkatraman S <svenkatr@...com>
To:	<linux-mmc@...r.kernel.org>, <cjb@...top.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <arnd.bergmann@...aro.org>,
	<alex.lemberg@...disk.com>, <ilan.smith@...disk.com>,
	<lporzio@...ron.com>, <rmk+kernel@....linux.org.uk>,
	Venkatraman S <svenkatr@...com>
Subject: [PATCH v2 13/16] mmc: Documentation: Add sysfs ABI for hpi_time_threshold

hpi_time_threshold can be set to configure elapsed time in ms,
after which an ongoing request will not be preempted.
Explain the hpi_time_threhold parameter for MMC devices.

Signed-off-by: Venkatraman S <svenkatr@...com>
---
 Documentation/ABI/testing/sysfs-devices-mmc |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-mmc b/Documentation/ABI/testing/sysfs-devices-mmc
index 5a50ab6..133dba5 100644
--- a/Documentation/ABI/testing/sysfs-devices-mmc
+++ b/Documentation/ABI/testing/sysfs-devices-mmc
@@ -19,3 +19,15 @@ Description:
 		is enabled, this attribute will indicate the size of enhanced
 		data area. If not, this attribute will be -EINVAL.
 		Unit KByte. Format decimal.
+
+What:		/sys/devices/.../mmc_host/mmcX/mmcX:XXXX/hpi_time_threshold
+Date:		April 2012
+Contact:	Venkatraman S <svenkatr@...com>
+Description:
+		High Priority Interrupt is a new feature defined in eMMC4.4
+		standard. If this feature is enabled, stack needs to decide
+		till what time since the last issued request is considered
+		preemptible. This attribute value (in milliseconds) is
+		used for arriving at the most optimal value for a specific
+		card. Default is zero, which also disables the feature, as
+		the request becomes non-preemptible immediately.
-- 
1.7.10.rc2

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