linux-kernel - [RFC 1/3] drm/doc: Relax fdinfo string constraints

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Message-Id: <20230417201215.448099-2-robdclark@gmail.com>
Date:   Mon, 17 Apr 2023 13:12:10 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org (open list:DOCUMENTATION),
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC 1/3] drm/doc: Relax fdinfo string constraints

From: Rob Clark <robdclark@...omium.org>

The restriction about no whitespace, etc, really only applies to the
usage of strings in keys.  Values can contain anything (other than
newline).

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 Documentation/gpu/drm-usage-stats.rst | 29 ++++++++++++++-------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst
index 258bdcc8fb86..8e00d53231e0 100644
--- a/Documentation/gpu/drm-usage-stats.rst
+++ b/Documentation/gpu/drm-usage-stats.rst
@@ -24,7 +24,7 @@ File format specification
 - All keys shall be prefixed with `drm-`.
 - Whitespace between the delimiter and first non-whitespace character shall be
   ignored when parsing.
-- Neither keys or values are allowed to contain whitespace characters.
+- Keys are not allowed to contain whitespace characters.
 - Numerical key value pairs can end with optional unit string.
 - Data type of the value is fixed as defined in the specification.
 
@@ -39,12 +39,13 @@ Data types
 ----------
 
 - <uint> - Unsigned integer without defining the maximum value.
-- <str> - String excluding any above defined reserved characters or whitespace.
+- <keystr> - String excluding any above defined reserved characters or whitespace.
+- <valstr> - String.
 
 Mandatory fully standardised keys
 ---------------------------------
 
-- drm-driver: <str>
+- drm-driver: <valstr>
 
 String shall contain the name this driver registered as via the respective
 `struct drm_driver` data structure.
@@ -69,10 +70,10 @@ scope of each device, in which case `drm-pdev` shall be present as well.
 Userspace should make sure to not double account any usage statistics by using
 the above described criteria in order to associate data to individual clients.
 
-- drm-engine-<str>: <uint> ns
+- drm-engine-<keystr>: <uint> ns
 
 GPUs usually contain multiple execution engines. Each shall be given a stable
-and unique name (str), with possible values documented in the driver specific
+and unique name (keystr), with possible values documented in the driver specific
 documentation.
 
 Value shall be in specified time units which the respective GPU engine spent
@@ -84,16 +85,16 @@ larger value within a reasonable period. Upon observing a value lower than what
 was previously read, userspace is expected to stay with that larger previous
 value until a monotonic update is seen.
 
-- drm-engine-capacity-<str>: <uint>
+- drm-engine-capacity-<keystr>: <uint>
 
 Engine identifier string must be the same as the one specified in the
-drm-engine-<str> tag and shall contain a greater than zero number in case the
+drm-engine-<keystr> tag and shall contain a greater than zero number in case the
 exported engine corresponds to a group of identical hardware engines.
 
 In the absence of this tag parser shall assume capacity of one. Zero capacity
 is not allowed.
 
-- drm-memory-<str>: <uint> [KiB|MiB]
+- drm-memory-<keystr>: <uint> [KiB|MiB]
 
 Each possible memory type which can be used to store buffer objects by the
 GPU in question shall be given a stable and unique name to be returned as the
@@ -126,10 +127,10 @@ The total size of buffers that are purgeable.
 
 The total size of buffers that are active on one or more rings.
 
-- drm-cycles-<str>: <uint>
+- drm-cycles-<keystr>: <uint>
 
 Engine identifier string must be the same as the one specified in the
-drm-engine-<str> tag and shall contain the number of busy cycles for the given
+drm-engine-<keystr> tag and shall contain the number of busy cycles for the given
 engine.
 
 Values are not required to be constantly monotonic if it makes the driver
@@ -138,12 +139,12 @@ larger value within a reasonable period. Upon observing a value lower than what
 was previously read, userspace is expected to stay with that larger previous
 value until a monotonic update is seen.
 
-- drm-maxfreq-<str>: <uint> [Hz|MHz|KHz]
+- drm-maxfreq-<keystr>: <uint> [Hz|MHz|KHz]
 
 Engine identifier string must be the same as the one specified in the
-drm-engine-<str> tag and shall contain the maximum frequency for the given
-engine.  Taken together with drm-cycles-<str>, this can be used to calculate
-percentage utilization of the engine, whereas drm-engine-<str> only reflects
+drm-engine-<keystr> tag and shall contain the maximum frequency for the given
+engine.  Taken together with drm-cycles-<keystr>, this can be used to calculate
+percentage utilization of the engine, whereas drm-engine-<keystr> only reflects
 time active without considering what frequency the engine is operating as a
 percentage of it's maximum frequency.
 
-- 
2.39.2