[Intel-gfx] [PATCH 2/6] drm/i915/gt: Lock intel_engine_apply_whitelist with uncore->lock

[Umesh Nerlige Ramappa]

Refactor intel_engine_apply_whitelist into locked and unlocked versions
so that a caller who already has the lock can apply whitelist.

v2: Fix sparse warning

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 44 +++++++++++++++------
 1 file changed, 31 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 6c580d0d9ea8..864194aa6eef 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1295,7 +1295,8 @@ void intel_gt_init_workarounds(struct drm_i915_private *i915)
 }
 
 static enum forcewake_domains
-wal_get_fw_for_rmw(struct intel_uncore *uncore, const struct i915_wa_list *wal)
+wal_get_fw(struct intel_uncore *uncore, const struct i915_wa_list *wal,
+	   unsigned int op)
 {
 	enum forcewake_domains fw = 0;
 	struct i915_wa *wa;
@@ -1304,8 +1305,7 @@ wal_get_fw_for_rmw(struct intel_uncore *uncore, const struct i915_wa_list *wal)
 	for (i = 0, wa = wal->list; i < wal->count; i++, wa++)
 		fw |= intel_uncore_forcewake_for_reg(uncore,
 						     wa->reg,
-						     FW_REG_READ |
-						     FW_REG_WRITE);
+						     op);
 
 	return fw;
 }
@@ -1335,7 +1335,7 @@ wa_list_apply(struct intel_uncore *uncore, const struct i915_wa_list *wal)
 	if (!wal->count)
 		return;
 
-	fw = wal_get_fw_for_rmw(uncore, wal);
+	fw = wal_get_fw(uncore, wal, FW_REG_READ | FW_REG_WRITE);
 
 	spin_lock_irqsave(&uncore->lock, flags);
 	intel_uncore_forcewake_get__locked(uncore, fw);
@@ -1645,27 +1645,45 @@ void intel_engine_init_whitelist(struct intel_engine_cs *engine)
 	wa_init_finish(w);
 }
 
-void intel_engine_apply_whitelist(struct intel_engine_cs *engine)
+static void intel_engine_apply_whitelist_locked(struct intel_engine_cs *engine)
 {
 	const struct i915_wa_list *wal = &engine->whitelist;
 	struct intel_uncore *uncore = engine->uncore;
 	const u32 base = engine->mmio_base;
 	struct i915_wa *wa;
 	unsigned int i;
+	enum forcewake_domains fw;
 
-	if (!wal->count)
-		return;
+	lockdep_assert_held(&uncore->lock);
+
+	fw = wal_get_fw(uncore, wal, FW_REG_WRITE);
+	intel_uncore_forcewake_get__locked(uncore, fw);
 
 	for (i = 0, wa = wal->list; i < wal->count; i++, wa++)
-		intel_uncore_write(uncore,
-				   RING_FORCE_TO_NONPRIV(base, i),
-				   i915_mmio_reg_offset(wa->reg));
+		intel_uncore_write_fw(uncore,
+				      RING_FORCE_TO_NONPRIV(base, i),
+				      i915_mmio_reg_offset(wa->reg));
 
 	/* And clear the rest just in case of garbage */
 	for (; i < RING_MAX_NONPRIV_SLOTS; i++)
-		intel_uncore_write(uncore,
-				   RING_FORCE_TO_NONPRIV(base, i),
-				   i915_mmio_reg_offset(RING_NOPID(base)));
+		intel_uncore_write_fw(uncore,
+				      RING_FORCE_TO_NONPRIV(base, i),
+				      i915_mmio_reg_offset(RING_NOPID(base)));
+
+	intel_uncore_forcewake_put__locked(uncore, fw);
+}
+
+void intel_engine_apply_whitelist(struct intel_engine_cs *engine)
+{
+	unsigned long flags;
+	const struct i915_wa_list *wal = &engine->whitelist;
+
+	if (!wal->count)
+		return;
+
+	spin_lock_irqsave(&engine->uncore->lock, flags);
+	intel_engine_apply_whitelist_locked(engine);
+	spin_unlock_irqrestore(&engine->uncore->lock, flags);
 }
 
 static void
-- 
2.20.1