redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

drm/i915: intel_engine_init_global_seqno() requires atomic kmap

Browse source 
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@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170320145609.4898-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Chris Wilson 2017-03-20 14:56:09 +00:00
parent 467221bc60
commit 24caf65593
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/gpu/drm/i915/intel_engine_cs.c
View file

@ -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);