On 20/03/2017 14:56, Chris Wilson wrote:
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 <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Mika Kuoppala <[email protected]>
---
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);
Reviewed-by: Tvrtko Ursulin <[email protected]>
Regards,
Tvrtko
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