[PATCH 17/25] drm/msm/dpu: remove RM HW block list iterator

[Jeykumar Sankaran <jsanka-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

Replacing with simpler linked list helper iterators.

Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 120 +++++++++++++--------------------
 1 file changed, 46 insertions(+), 74 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index 1234991..a79456c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -45,49 +45,6 @@ struct dpu_rm_hw_blk {
 	struct dpu_hw_blk *hw;
 };
 
-/**
- * struct dpu_rm_hw_iter - iterator for use with dpu_rm
- * @blk: dpu_rm internal block representation. Clients ignore. Used as iterator.
- * @type: Hardware Block Type client wishes to search for.
- */
-struct dpu_rm_hw_iter {
-	struct dpu_rm_hw_blk *blk;
-	enum dpu_hw_blk_type type;
-};
-
-static void _dpu_rm_init_hw_iter(
-		struct dpu_rm_hw_iter *iter,
-		enum dpu_hw_blk_type type)
-{
-	memset(iter, 0, sizeof(*iter));
-	iter->type = type;
-}
-
-static bool _dpu_rm_get_hw_locked(struct dpu_rm *rm, struct dpu_rm_hw_iter *i)
-{
-	struct list_head *blk_list;
-
-	if (!rm || !i || i->type >= DPU_HW_BLK_MAX) {
-		DPU_ERROR("invalid rm\n");
-		return false;
-	}
-
-	blk_list = &rm->hw_blks[i->type];
-
-	if (i->blk && (&i->blk->list == blk_list)) {
-		DPU_DEBUG("attempt resume iteration past last\n");
-		return false;
-	}
-
-	i->blk = list_prepare_entry(i->blk, blk_list, list);
-
-	list_for_each_entry_continue(i->blk, blk_list, list)
-		if (!i->blk->in_use)
-			return true;
-
-	return false;
-}
-
 static void _dpu_rm_hw_destroy(enum dpu_hw_blk_type type, void *hw)
 {
 	switch (type) {
@@ -301,7 +258,8 @@ static bool _dpu_rm_check_lm_and_get_connected_blks(
 		struct dpu_rm_hw_blk *primary_lm)
 {
 	const struct dpu_lm_cfg *lm_cfg = to_dpu_hw_mixer(lm->hw)->cap;
-	struct dpu_rm_hw_iter iter;
+	struct dpu_rm_hw_blk *iter;
+	struct list_head *blk_list = &rm->hw_blks[DPU_HW_BLK_PINGPONG];
 
 	*pp = NULL;
 
@@ -320,10 +278,12 @@ static bool _dpu_rm_check_lm_and_get_connected_blks(
 		}
 	}
 
-	_dpu_rm_init_hw_iter(&iter, DPU_HW_BLK_PINGPONG);
-	while (_dpu_rm_get_hw_locked(rm, &iter)) {
-		if (iter.blk->hw->id == lm_cfg->pingpong) {
-			*pp = iter.blk;
+	list_for_each_entry(iter, blk_list, list) {
+		if (iter->in_use)
+			continue;
+
+		if (iter->hw->id == lm_cfg->pingpong) {
+			*pp = iter;
 			break;
 		}
 	}
@@ -343,7 +303,8 @@ static int _dpu_rm_reserve_lms(struct dpu_rm *rm,
 {
 	struct dpu_rm_hw_blk *lm[MAX_BLOCKS];
 	struct dpu_rm_hw_blk *pp[MAX_BLOCKS];
-	struct dpu_rm_hw_iter iter_i, iter_j;
+	struct dpu_rm_hw_blk *iter_i, *iter_j;
+	struct list_head *blk_list = &rm->hw_blks[DPU_HW_BLK_LM];
 	int lm_count = 0;
 	int i, rc = 0;
 
@@ -353,14 +314,18 @@ static int _dpu_rm_reserve_lms(struct dpu_rm *rm,
 	}
 
 	/* Find a primary mixer */
-	_dpu_rm_init_hw_iter(&iter_i, DPU_HW_BLK_LM);
-	while (lm_count != reqs->topology.num_lm &&
-			_dpu_rm_get_hw_locked(rm, &iter_i)) {
+	list_for_each_entry(iter_i, blk_list, list) {
+		if (iter_i->in_use)
+			continue;
+
+		if (lm_count == reqs->topology.num_lm)
+			break;
+
 		memset(&lm, 0, sizeof(lm));
 		memset(&pp, 0, sizeof(pp));
 
 		lm_count = 0;
-		lm[lm_count] = iter_i.blk;
+		lm[lm_count] = iter_i;
 
 		if (!_dpu_rm_check_lm_and_get_connected_blks(
 				rm, reqs, lm[lm_count],
@@ -370,19 +335,22 @@ static int _dpu_rm_reserve_lms(struct dpu_rm *rm,
 		++lm_count;
 
 		/* Valid primary mixer found, find matching peers */
-		_dpu_rm_init_hw_iter(&iter_j, DPU_HW_BLK_LM);
+		list_for_each_entry(iter_j, blk_list, list) {
+			if (iter_j->in_use)
+				continue;
 
-		while (lm_count != reqs->topology.num_lm &&
-				_dpu_rm_get_hw_locked(rm, &iter_j)) {
-			if (iter_i.blk == iter_j.blk)
+			if (lm_count == reqs->topology.num_lm)
+				break;
+
+			if (iter_i == iter_j)
 				continue;
 
 			if (!_dpu_rm_check_lm_and_get_connected_blks(
-					rm, reqs, iter_j.blk,
-					&pp[lm_count], iter_i.blk))
+					rm, reqs, iter_j,
+					&pp[lm_count], iter_i))
 				continue;
 
-			lm[lm_count] = iter_j.blk;
+			lm[lm_count] = iter_j;
 			++lm_count;
 		}
 	}
@@ -417,7 +385,9 @@ static int _dpu_rm_reserve_ctls(
 		const struct msm_display_topology *top)
 {
 	struct dpu_rm_hw_blk *ctls[MAX_BLOCKS];
-	struct dpu_rm_hw_iter iter;
+	struct dpu_rm_hw_blk *iter;
+	struct list_head *blk_list = &rm->hw_blks[DPU_HW_BLK_CTL];
+
 	int i = 0, num_ctls = 0;
 	bool needs_split_display = false;
 
@@ -428,21 +398,23 @@ static int _dpu_rm_reserve_ctls(
 
 	needs_split_display = _dpu_rm_needs_split_display(top);
 
-	_dpu_rm_init_hw_iter(&iter, DPU_HW_BLK_CTL);
-	while (_dpu_rm_get_hw_locked(rm, &iter)) {
-		const struct dpu_hw_ctl *ctl = to_dpu_hw_ctl(iter.blk->hw);
+	list_for_each_entry(iter, blk_list, list)  {
+		const struct dpu_hw_ctl *ctl = to_dpu_hw_ctl(iter->hw);
 		unsigned long features = ctl->caps->features;
 		bool has_split_display;
 
+		if (iter->in_use)
+			continue;
+
 		has_split_display = BIT(DPU_CTL_SPLIT_DISPLAY) & features;
 
-		DPU_DEBUG("ctl %d caps 0x%lX\n", iter.blk->hw->id, features);
+		DPU_DEBUG("ctl %d caps 0x%lX\n", iter->hw->id, features);
 
 		if (needs_split_display != has_split_display)
 			continue;
 
-		ctls[i] = iter.blk;
-		DPU_DEBUG("ctl %d match\n", iter.blk->hw->id);
+		ctls[i] = iter;
+		DPU_DEBUG("ctl %d match\n", iter->hw->id);
 
 		if (++i == num_ctls)
 			break;
@@ -468,26 +440,26 @@ static struct dpu_rm_hw_blk *_dpu_rm_reserve_intf(
 		uint32_t id,
 		enum dpu_hw_blk_type type)
 {
-	struct dpu_rm_hw_iter iter;
+	struct dpu_rm_hw_blk *iter;
+	struct list_head *blk_list = &rm->hw_blks[DPU_HW_BLK_INTF];
 
 	/* Find the block entry in the rm, and note the reservation */
-	_dpu_rm_init_hw_iter(&iter, type);
-	while (_dpu_rm_get_hw_locked(rm, &iter)) {
-		if (iter.blk->hw->id != id)
+	list_for_each_entry(iter, blk_list, list)  {
+		if (iter->hw->id != id || iter->in_use)
 			continue;
 
-		trace_dpu_rm_reserve_intf(iter.blk->hw->id, DPU_HW_BLK_INTF);
+		trace_dpu_rm_reserve_intf(iter->hw->id, DPU_HW_BLK_INTF);
 
 		break;
 	}
 
 	/* Shouldn't happen since intfs are fixed at probe */
-	if (!iter.blk) {
+	if (!iter) {
 		DPU_ERROR("couldn't find type %d id %d\n", type, id);
 		return NULL;
 	}
 
-	return iter.blk;
+	return iter;
 }
 
 static int _dpu_rm_reserve_intf_related_hw(
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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