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055634e4b6
Similar to AMD commit
8744425411 ("drm/amdgpu: Add show_fdinfo() interface"), using the
infrastructure added in previous patches, we add basic client info
and GPU engine utilisation for i915.
Example of the output:
pos: 0
flags: 0100002
mnt_id: 21
drm-driver: i915
drm-pdev: 0000:00:02.0
drm-client-id: 7
drm-engine-render: 9288864723 ns
drm-engine-copy: 2035071108 ns
drm-engine-video: 0 ns
drm-engine-video-enhance: 0 ns
v2:
* Update for removal of name and pid.
v3:
* Use drm_driver.name.
v4:
* Added drm-engine-capacity- tag.
* Fix typo. (Umesh)
v5:
* Don't output engine data before Gen8.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: David M Nieto <David.Nieto@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Chris Healy <cphealy@gmail.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220401142205.3123159-9-tvrtko.ursulin@linux.intel.com
113 lines
3.9 KiB
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113 lines
3.9 KiB
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.. _drm-client-usage-stats:
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======================
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DRM client usage stats
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======================
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DRM drivers can choose to export partly standardised text output via the
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`fops->show_fdinfo()` as part of the driver specific file operations registered
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in the `struct drm_driver` object registered with the DRM core.
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One purpose of this output is to enable writing as generic as practicaly
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feasible `top(1)` like userspace monitoring tools.
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Given the differences between various DRM drivers the specification of the
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output is split between common and driver specific parts. Having said that,
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wherever possible effort should still be made to standardise as much as
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possible.
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File format specification
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=========================
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- File shall contain one key value pair per one line of text.
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- Colon character (`:`) must be used to delimit keys and values.
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- All keys shall be prefixed with `drm-`.
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- Whitespace between the delimiter and first non-whitespace character shall be
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ignored when parsing.
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- Neither keys or values are allowed to contain whitespace characters.
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- Numerical key value pairs can end with optional unit string.
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- Data type of the value is fixed as defined in the specification.
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Key types
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---------
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1. Mandatory, fully standardised.
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2. Optional, fully standardised.
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3. Driver specific.
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Data types
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----------
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- <uint> - Unsigned integer without defining the maximum value.
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- <str> - String excluding any above defined reserved characters or whitespace.
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Mandatory fully standardised keys
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---------------------------------
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- drm-driver: <str>
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String shall contain the name this driver registered as via the respective
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`struct drm_driver` data structure.
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Optional fully standardised keys
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--------------------------------
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- drm-pdev: <aaaa:bb.cc.d>
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For PCI devices this should contain the PCI slot address of the device in
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question.
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- drm-client-id: <uint>
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Unique value relating to the open DRM file descriptor used to distinguish
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duplicated and shared file descriptors. Conceptually the value should map 1:1
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to the in kernel representation of `struct drm_file` instances.
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Uniqueness of the value shall be either globally unique, or unique within the
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scope of each device, in which case `drm-pdev` shall be present as well.
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Userspace should make sure to not double account any usage statistics by using
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the above described criteria in order to associate data to individual clients.
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- drm-engine-<str>: <uint> ns
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GPUs usually contain multiple execution engines. Each shall be given a stable
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and unique name (str), with possible values documented in the driver specific
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documentation.
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Value shall be in specified time units which the respective GPU engine spent
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busy executing workloads belonging to this client.
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Values are not required to be constantly monotonic if it makes the driver
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implementation easier, but are required to catch up with the previously reported
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larger value within a reasonable period. Upon observing a value lower than what
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was previously read, userspace is expected to stay with that larger previous
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value until a monotonic update is seen.
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- drm-engine-capacity-<str>: <uint>
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Engine identifier string must be the same as the one specified in the
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drm-engine-<str> tag and shall contain a greater than zero number in case the
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exported engine corresponds to a group of identical hardware engines.
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In the absence of this tag parser shall assume capacity of one. Zero capacity
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is not allowed.
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- drm-memory-<str>: <uint> [KiB|MiB]
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Each possible memory type which can be used to store buffer objects by the
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GPU in question shall be given a stable and unique name to be returned as the
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string here.
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Value shall reflect the amount of storage currently consumed by the buffer
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object belong to this client, in the respective memory region.
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Default unit shall be bytes with optional unit specifiers of 'KiB' or 'MiB'
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indicating kibi- or mebi-bytes.
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===============================
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Driver specific implementations
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===============================
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:ref:`i915-usage-stats`
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