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drm/i915/gt: Use caller provided forcewake for intel_mocs_init_engine

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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
This commit is contained in:
Chris Wilson 2019-07-03 16:52:23 +01:00
parent b7dc9395c5
commit 56e0f78e47
1 changed files with 9 additions and 6 deletions
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15
drivers/gpu/drm/i915/gt/intel_mocs.c
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@ -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);
}
/**