• Chris Wilson's avatar
    drm/i915/gt: Expose engine properties via sysfs · 4ec76dbe
    Chris Wilson authored
    Preliminary stub to add engines underneath /sys/class/drm/cardN/, so
    that we can expose properties on each engine to the sysadmin.
    
    To start with we have basic analogues of the i915_query ioctl so that we
    can pretty print engine discovery from the shell, and flesh out the
    directory structure. Later we will add writeable sysadmin properties such
    as per-engine timeout controls.
    
    An example tree of the engine properties on Braswell:
        /sys/class/drm/card0
        └── engine
            ├── bcs0
            │   ├── capabilities
            │   ├── class
            │   ├── instance
            │   ├── known_capabilities
            │   └── name
            ├── rcs0
            │   ├── capabilities
            │   ├── class
            │   ├── instance
            │   ├── known_capabilities
            │   └── name
            ├── vcs0
            │   ├── capabilities
            │   ├── class
            │   ├── instance
            │   ├── known_capabilities
            │   └── name
            └── vecs0
                ├── capabilities
                ├── class
                ├── instance
                ├── known_capabilities
                └── name
    
    v2: Include stringified capabilities
    v3: Include all known capabilities for futureproofing.
    v4: Combine the two caps loops into one
    
    v5: Hide underneath Kconfig.unstable for wider discussion
    Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
    Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
    Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
    Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
    Acked-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
    Reviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
    Tested-by: default avatarSteve Carbonari <steven.carbonari@intel.com>
    Reviewed-by: default avatarSteve Carbonari <steven.carbonari@intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20200228131716.3243616-1-chris@chris-wilson.co.uk
    4ec76dbe
sysfs_engines.h 263 Bytes