From 56e0f78e47e47795873acbabab443029aa30bcb4 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 3 Jul 2019 16:52:23 +0100
Subject: drm/i915/gt: Use caller provided forcewake for intel_mocs_init_engine
Git-commit: 56e0f78e47e47795873acbabab443029aa30bcb4
Patch-mainline: v5.4-rc1
References: bsc#1152489
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 <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190703155225.9501-2-chris@chris-wilson.co.uk
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
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);
}
/**
--
2.28.0