From 56e0f78e47e47795873acbabab443029aa30bcb4 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 3 Jul 2019 16:52:23 +0100 Subject: [PATCH] drm/i915/gt: Use caller provided forcewake for intel_mocs_init_engine During post-reset resume, we call intel_mocs_init_engine to reinitialise the MOCS registers. Suprisingly, especially when enhanced by lockdep, the acquisition of the forcewake lock around each register write takes a substantial portion of the reset time. We don't need to use the individual forcewake here as we can assume that the caller is holding a blanket forcewake for the reset&resume and the resume is serialised. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20190703155225.9501-2-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_mocs.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_mocs.c b/drivers/gpu/drm/i915/gt/intel_mocs.c index ae6cbf0d517c..290a5e9b90b9 100644 --- a/drivers/gpu/drm/i915/gt/intel_mocs.c +++ b/drivers/gpu/drm/i915/gt/intel_mocs.c @@ -346,6 +346,9 @@ void intel_mocs_init_engine(struct intel_engine_cs *engine) unsigned int index; u32 unused_value; + /* Called under a blanket forcewake */ + assert_forcewakes_active(uncore, FORCEWAKE_ALL); + if (!get_mocs_settings(gt, &table)) return; @@ -355,16 +358,16 @@ void intel_mocs_init_engine(struct intel_engine_cs *engine) for (index = 0; index < table.size; index++) { u32 value = get_entry_control(&table, index); - intel_uncore_write(uncore, - mocs_register(engine->id, index), - value); + intel_uncore_write_fw(uncore, + mocs_register(engine->id, index), + value); } /* All remaining entries are also unused */ for (; index < table.n_entries; index++) - intel_uncore_write(uncore, - mocs_register(engine->id, index), - unused_value); + intel_uncore_write_fw(uncore, + mocs_register(engine->id, index), + unused_value); } /** -- 2.30.2