[Intel-gfx] [PATCH] drm/i915: intel_engine_init_global_seqno() requires atomic kmap

[Chris Wilson]

As intel_engine_init_global_seqno() may be called by
nop_submit_request() from inside irq context, we have to use atomic
versions of kmap/kunmap. This is rare as this requires using gen8 legacy
ringbuffer submission.

Reported-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 4200faa520c7..ef3c62000697 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -242,12 +242,12 @@ void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno)
 		void *semaphores;
 
 		/* Semaphores are in noncoherent memory, flush to be safe */
-		semaphores = kmap(page);
+		semaphores = kmap_atomic(page);
 		memset(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
 		       0, I915_NUM_ENGINES * gen8_semaphore_seqno_size);
 		drm_clflush_virt_range(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
 				       I915_NUM_ENGINES * gen8_semaphore_seqno_size);
-		kunmap(page);
+		kunmap_atomic(semaphores);
 	}
 
 	intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
-- 
2.11.0