drm/i915/gt: Assume we hold forcewake for execlists resume

We can assume the caller is holding a blanket forcewake for the
register writes during resume, and so we can skip taking individual
locks around each write inside execlists resume.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190703155225.9501-3-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index f5b09b2..15906a1 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2076,22 +2076,23 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine)
 
 static void enable_execlists(struct intel_engine_cs *engine)
 {
+       u32 mode;
+
+       assert_forcewakes_active(engine->uncore, FORCEWAKE_ALL);
+
        intel_engine_set_hwsp_writemask(engine, ~0u); /* HWSTAM */
 
        if (INTEL_GEN(engine->i915) >= 11)
-               ENGINE_WRITE(engine,
-                            RING_MODE_GEN7,
-                            _MASKED_BIT_ENABLE(GEN11_GFX_DISABLE_LEGACY_MODE));
+               mode = _MASKED_BIT_ENABLE(GEN11_GFX_DISABLE_LEGACY_MODE);
        else
-               ENGINE_WRITE(engine,
-                            RING_MODE_GEN7,
-                            _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
+               mode = _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE);
+       ENGINE_WRITE_FW(engine, RING_MODE_GEN7, mode);
 
-       ENGINE_WRITE(engine, RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
+       ENGINE_WRITE_FW(engine, RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
 
-       ENGINE_WRITE(engine,
-                    RING_HWS_PGA,
-                    i915_ggtt_offset(engine->status_page.vma));
+       ENGINE_WRITE_FW(engine,
+                       RING_HWS_PGA,
+                       i915_ggtt_offset(engine->status_page.vma));
        ENGINE_POSTING_READ(engine, RING_HWS_PGA);
 }
 
@@ -2099,7 +2100,7 @@ static bool unexpected_starting_state(struct intel_engine_cs *engine)
 {
        bool unexpected = false;
 
-       if (ENGINE_READ(engine, RING_MI_MODE) & STOP_RING) {
+       if (ENGINE_READ_FW(engine, RING_MI_MODE) & STOP_RING) {
                DRM_DEBUG_DRIVER("STOP_RING still set in RING_MI_MODE\n");
                unexpected = true;
        }