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@xxxxxxxxxxxxxxxxxx>
---
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);
}
/**
--
2.20.1
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