From: Chris Wilson chris@chris-wilson.co.uk

If the cacheline may still be busy, atomically mark it for future release, and only if we can determine that it will never be used again, immediately free it.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1392 Fixes: ebece7539242 ("drm/i915: Keep timeline HWSP allocated until idle across the system") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Tvrtko Ursulin tvrtko.ursulin@intel.com Cc: Mika Kuoppala mika.kuoppala@linux.intel.com Cc: Matthew Auld matthew.auld@intel.com Reviewed-by: Mika Kuoppala mika.kuoppala@linux.intel.com Cc: stable@vger.kernel.org # v5.2+ Link: https://patchwork.freedesktop.org/patch/msgid/20200306154647.3528345-1-chris... (cherry picked from commit 2d4bd971f5baa51418625f379a69f5d58b5a0450) Signed-off-by: Jani Nikula jani.nikula@intel.com (cherry picked from commit 8ea6bb8e4d47e07518e5dba4f5cb77e210f0df82) --- drivers/gpu/drm/i915/gt/intel_timeline.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c index 23405e1558c6..3621273ad99a 100644 --- a/drivers/gpu/drm/i915/gt/intel_timeline.c +++ b/drivers/gpu/drm/i915/gt/intel_timeline.c @@ -192,11 +192,15 @@ static void cacheline_release(struct intel_timeline_cacheline *cl)

static void cacheline_free(struct intel_timeline_cacheline *cl) { + if (!i915_active_acquire_if_busy(&cl->active)) { + __idle_cacheline_free(cl); + return; + } + GEM_BUG_ON(ptr_test_bit(cl->vaddr, CACHELINE_FREE)); cl->vaddr = ptr_set_bit(cl->vaddr, CACHELINE_FREE);

- if (i915_active_is_idle(&cl->active)) - __idle_cacheline_free(cl); + i915_active_release(&cl->active); }

int intel_timeline_init(struct intel_timeline *timeline,