[Intel-gfx] [PATCH v3 5/6] drm/i915: count powergating transitions per engine

[Lionel Landwerlin]

This can be used to monitor the number of powergating transition
changes for a particular workload.

Signed-off-by: Lionel Landwerlin <lionel.g.landwer...@intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c  | 2 ++
 drivers/gpu/drm/i915/intel_lrc.c        | 1 +
 drivers/gpu/drm/i915/intel_ringbuffer.c | 1 +
 drivers/gpu/drm/i915/intel_ringbuffer.h | 1 +
 4 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c 
b/drivers/gpu/drm/i915/intel_engine_cs.c
index 70325e0824e3..63348c20c6ed 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1437,6 +1437,8 @@ void intel_engine_dump(struct intel_engine_cs *engine,
        hexdump(m, engine->status_page.page_addr, PAGE_SIZE);
 
        drm_printf(m, "Idle? %s\n", yesno(intel_engine_is_idle(engine)));
+
+       drm_printf(m, "Powergating transitions: %u\n", 
atomic_read(&engine->sseu_transitions));
 }
 
 static u8 user_class_map[] = {
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index df4a7bb07eae..5b089a8439ac 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -540,6 +540,7 @@ static void maybe_enable_noa_repgoram(struct i915_request 
*rq)
        *cs++ = i915_ggtt_offset(stream->noa_reprogram_vma);
 
        engine->last_sseu = ce->sseu;
+       atomic_inc(&engine->sseu_transitions);
 }
 
 static void port_assign(struct execlist_port *port, struct i915_request *rq)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c 
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index cde791234397..8e9aa31e9b2d 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -526,6 +526,7 @@ static int init_ring_common(struct intel_engine_cs *engine)
                I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));
 
        memset(&engine->last_sseu, 0, sizeof(engine->last_sseu));
+       atomic_set(&engine->sseu_transitions, 0);
 
 out:
        intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h 
b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 2f8518e1a49f..ad269f09af5e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -344,6 +344,7 @@ struct intel_engine_cs {
        struct drm_i915_gem_object *default_state;
 
        union i915_gem_sseu last_sseu;
+       atomic_t sseu_transitions;
 
        atomic_t irq_count;
        unsigned long irq_posted;
-- 
2.17.0

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