[PATCH 11/19] drm/i915/execlists: Double check rpm wakeref

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As we are splitting processing the CSB events from submitting the ELSP,
we also need to duplicate the check that we hold a device wakeref for our
hardware access to the disjoint locations.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_lrc.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 4928e9ad7826..6d3b03299b0c 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -449,6 +449,16 @@ static void execlists_submit_ports(struct intel_engine_cs *engine)
 	struct execlist_port *port = execlists->port;
 	unsigned int n;
 
+	/*
+	 * We can skip acquiring intel_runtime_pm_get() here as it was taken
+	 * on our behalf by the request (see i915_gem_mark_busy()) and it will
+	 * not be relinquished until the device is idle (see
+	 * i915_gem_idle_work_handler()). As a precaution, we make sure
+	 * that all ELSP are drained i.e. we have processed the CSB,
+	 * before allowing ourselves to idle and calling intel_runtime_pm_put().
+	 */
+	GEM_BUG_ON(!engine->i915->gt.awake);
+
 	/*
 	 * ELSQ note: the submit queue is not cleared after being submitted
 	 * to the HW so we need to make sure we always clean it up. This is
@@ -959,6 +969,12 @@ static void process_csb(struct intel_engine_cs *engine)
 	struct drm_i915_private *i915 = engine->i915;
 	bool fw = false;
 
+	/*
+	 * We must never release our device wakeref until after we have
+	 * finished processing all potential interrupts from the hardware.
+	 */
+	GEM_BUG_ON(!engine->i915->gt.awake);
+
 	do {
 		/* The HWSP contains a (cacheable) mirror of the CSB */
 		const u32 *buf =
@@ -1139,16 +1155,6 @@ static void execlists_submission_tasklet(unsigned long data)
 		  engine->execlists.active,
 		  test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted));
 
-	/*
-	 * We can skip acquiring intel_runtime_pm_get() here as it was taken
-	 * on our behalf by the request (see i915_gem_mark_busy()) and it will
-	 * not be relinquished until the device is idle (see
-	 * i915_gem_idle_work_handler()). As a precaution, we make sure
-	 * that all ELSP are drained i.e. we have processed the CSB,
-	 * before allowing ourselves to idle and calling intel_runtime_pm_put().
-	 */
-	GEM_BUG_ON(!engine->i915->gt.awake);
-
 	/*
 	 * Prefer doing test_and_clear_bit() as a two stage operation to avoid
 	 * imposing the cost of a locked atomic transaction when submitting a
-- 
2.17.0

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