drm/i915: Move the scheduler feature bits into the purview of the engines

Rather than having the high level ioctl interface guess the underlying
implementation details, having the implementation declare what
capabilities it exports. We define an intel_driver_caps, similar to the
intel_device_info, which instead of trying to describe the HW gives
details on what the driver itself supports. This is then populated by
the engine backend for the new scheduler capability field for use
elsewhere.

v2: Use caps.scheduler for validating CONTEXT_PARAM_SET_PRIORITY (Mika)
    One less assumption of engine[RCS] \o/

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tomasz Lis <tomasz.lis@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Tomasz Lis <tomasz.lis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207210544.26351-2-chris@chris-wilson.co.uk
Reviewed-by: Michel Thierry <michel.thierry@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 9542018d11d0..71fdfb0451ef 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -167,6 +167,10 @@ struct intel_device_info {
 	} color;
 };
 
+struct intel_driver_caps {
+	unsigned int scheduler;
+};
+
 static inline unsigned int sseu_subslice_total(const struct sseu_dev_info *sseu)
 {
 	return hweight8(sseu->slice_mask) * hweight8(sseu->subslice_mask);
@@ -182,4 +186,7 @@ void intel_device_info_dump_flags(const struct intel_device_info *info,
 void intel_device_info_dump_runtime(const struct intel_device_info *info,
 				    struct drm_printer *p);
 
+void intel_driver_caps_print(const struct intel_driver_caps *caps,
+			     struct drm_printer *p);
+
 #endif