From: Chris Wilson Date: Thu, 5 Jan 2017 15:30:21 +0000 (+0000) Subject: drm/i915/execlists: Reorder execlists register enabling X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f3b8f9126a9f3312636780fe83b923f3f63137fb;p=linux-beck.git drm/i915/execlists: Reorder execlists register enabling Empirically we restart following a GPU reset more successfully if we call lrc_init_hws() (which contains a posting read) last. (The failure mode that was observed was that breadcrumb writes into the HWS from the recovered requests went astray leading to the context-switch maintaining forward progress, but the requests not being retired/completed.) For clarity, lrc_init_hws() is inlined (and the unused function then removed). Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Mika Kuoppala Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/20170105153023.30575-3-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 51ecb395551b..a9eefb171170 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1335,15 +1335,6 @@ out: return ret; } -static void lrc_init_hws(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - - I915_WRITE(RING_HWS_PGA(engine->mmio_base), - engine->status_page.ggtt_offset); - POSTING_READ(RING_HWS_PGA(engine->mmio_base)); -} - static int gen8_init_common_ring(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; @@ -1353,20 +1344,19 @@ static int gen8_init_common_ring(struct intel_engine_cs *engine) if (ret) return ret; - lrc_init_hws(engine); - intel_engine_reset_breadcrumbs(engine); + intel_engine_init_hangcheck(engine); I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff); - I915_WRITE(RING_MODE_GEN7(engine), _MASKED_BIT_DISABLE(GFX_REPLAY_MODE) | _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE)); + I915_WRITE(RING_HWS_PGA(engine->mmio_base), + engine->status_page.ggtt_offset); + POSTING_READ(RING_HWS_PGA(engine->mmio_base)); DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name); - intel_engine_init_hangcheck(engine); - /* After a GPU reset, we may have requests to replay */ if (!execlists_elsp_idle(engine)) { engine->execlist_port[0].count = 0;