drm/msm/dpu: Refactor rm iterator

Make iterator implementation private, and add function to
query resources assigned to an encoder.
Signed-off-by: Drew Davenport <ddavenport@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -957,11 +957,11 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 	struct drm_connector *conn = NULL, *conn_iter;
 	struct drm_crtc *drm_crtc;
 	struct dpu_crtc_state *cstate;
-	struct dpu_rm_hw_iter hw_iter;
 	struct msm_display_topology topology;
-	struct dpu_hw_ctl *hw_ctl[MAX_CHANNELS_PER_ENC] = { NULL };
-	struct dpu_hw_mixer *hw_lm[MAX_CHANNELS_PER_ENC] = { NULL };
-	int num_lm = 0, num_ctl = 0;
+	struct dpu_hw_blk *hw_pp[MAX_CHANNELS_PER_ENC];
+	struct dpu_hw_blk *hw_ctl[MAX_CHANNELS_PER_ENC];
+	struct dpu_hw_blk *hw_lm[MAX_CHANNELS_PER_ENC];
+	int num_lm, num_ctl, num_pp;
 	int i, j, ret;
 
 	if (!drm_enc) {
@@ -1005,42 +1005,31 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 		return;
 	}
 
-	dpu_rm_init_hw_iter(&hw_iter, drm_enc->base.id, DPU_HW_BLK_PINGPONG);
-	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
-		dpu_enc->hw_pp[i] = NULL;
-		if (!dpu_rm_get_hw(&dpu_kms->rm, &hw_iter))
-			break;
-		dpu_enc->hw_pp[i] = (struct dpu_hw_pingpong *) hw_iter.hw;
-	}
-
-	dpu_rm_init_hw_iter(&hw_iter, drm_enc->base.id, DPU_HW_BLK_CTL);
-	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
-		if (!dpu_rm_get_hw(&dpu_kms->rm, &hw_iter))
-			break;
-		hw_ctl[i] = (struct dpu_hw_ctl *)hw_iter.hw;
-		num_ctl++;
-	}
+	num_pp = dpu_rm_get_assigned_resources(&dpu_kms->rm, drm_enc->base.id,
+		DPU_HW_BLK_PINGPONG, hw_pp, ARRAY_SIZE(hw_pp));
+	num_ctl = dpu_rm_get_assigned_resources(&dpu_kms->rm, drm_enc->base.id,
+		DPU_HW_BLK_CTL, hw_ctl, ARRAY_SIZE(hw_ctl));
+	num_lm = dpu_rm_get_assigned_resources(&dpu_kms->rm, drm_enc->base.id,
+		DPU_HW_BLK_LM, hw_lm, ARRAY_SIZE(hw_lm));
 
-	dpu_rm_init_hw_iter(&hw_iter, drm_enc->base.id, DPU_HW_BLK_LM);
-	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
-		if (!dpu_rm_get_hw(&dpu_kms->rm, &hw_iter))
-			break;
-		hw_lm[i] = (struct dpu_hw_mixer *)hw_iter.hw;
-		num_lm++;
-	}
+	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++)
+		dpu_enc->hw_pp[i] = i < num_pp ? to_dpu_hw_pingpong(hw_pp[i])
+						: NULL;
 
 	cstate = to_dpu_crtc_state(drm_crtc->state);
 
 	for (i = 0; i < num_lm; i++) {
 		int ctl_idx = (i < num_ctl) ? i : (num_ctl-1);
 
-		cstate->mixers[i].hw_lm = hw_lm[i];
-		cstate->mixers[i].lm_ctl = hw_ctl[ctl_idx];
+		cstate->mixers[i].hw_lm = to_dpu_hw_mixer(hw_lm[i]);
+		cstate->mixers[i].lm_ctl = to_dpu_hw_ctl(hw_ctl[ctl_idx]);
 	}
 
 	cstate->num_mixers = num_lm;
 
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
+		int num_blk;
+		struct dpu_hw_blk *hw_blk[MAX_CHANNELS_PER_ENC];
 		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
 
 		if (!dpu_enc->hw_pp[i]) {
@@ -1056,17 +1045,15 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 		}
 
 		phys->hw_pp = dpu_enc->hw_pp[i];
-		phys->hw_ctl = hw_ctl[i];
+		phys->hw_ctl = to_dpu_hw_ctl(hw_ctl[i]);
 
-		dpu_rm_init_hw_iter(&hw_iter, drm_enc->base.id,
-				    DPU_HW_BLK_INTF);
-		for (j = 0; j < MAX_CHANNELS_PER_ENC; j++) {
+		num_blk = dpu_rm_get_assigned_resources(&dpu_kms->rm,
+			drm_enc->base.id, DPU_HW_BLK_INTF, hw_blk,
+			ARRAY_SIZE(hw_blk));
+		for (j = 0; j < num_blk; j++) {
 			struct dpu_hw_intf *hw_intf;
 
-			if (!dpu_rm_get_hw(&dpu_kms->rm, &hw_iter))
-				break;
-
-			hw_intf = (struct dpu_hw_intf *)hw_iter.hw;
+			hw_intf = to_dpu_hw_intf(hw_blk[i]);
 			if (hw_intf->idx == phys->intf_idx)
 				phys->hw_intf = hw_intf;
 		}

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h

@@ -89,6 +89,16 @@ struct dpu_hw_intf {
 	struct dpu_hw_intf_ops ops;
 };
 
+/**
+ * to_dpu_hw_intf - convert base object dpu_hw_base to container
+ * @hw: Pointer to base hardware block
+ * return: Pointer to hardware block container
+ */
+static inline struct dpu_hw_intf *to_dpu_hw_intf(struct dpu_hw_blk *hw)
+{
+	return container_of(hw, struct dpu_hw_intf, base);
+}
+
 /**
  * dpu_hw_intf_init(): Initializes the intf driver for the passed
  * interface idx.

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.h

@@ -96,6 +96,16 @@ struct dpu_hw_pingpong {
 	struct dpu_hw_pingpong_ops ops;
 };
 
+/**
+ * to_dpu_hw_pingpong - convert base object dpu_hw_base to container
+ * @hw: Pointer to base hardware block
+ * return: Pointer to hardware block container
+ */
+static inline struct dpu_hw_pingpong *to_dpu_hw_pingpong(struct dpu_hw_blk *hw)
+{
+	return container_of(hw, struct dpu_hw_pingpong, base);
+}
+
 /**
  * dpu_hw_pingpong_init - initializes the pingpong driver for the passed
  *	pingpong idx.

drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c

@@ -40,7 +40,21 @@ struct dpu_rm_hw_blk {
 	struct dpu_hw_blk *hw;
 };
 
-void dpu_rm_init_hw_iter(
+/**
+ * struct dpu_rm_hw_iter - iterator for use with dpu_rm
+ * @hw: dpu_hw object requested, or NULL on failure
+ * @blk: dpu_rm internal block representation. Clients ignore. Used as iterator.
+ * @enc_id: DRM ID of Encoder client wishes to search for, or 0 for Any Encoder
+ * @type: Hardware Block Type client wishes to search for.
+ */
+struct dpu_rm_hw_iter {
+	void *hw;
+	struct dpu_rm_hw_blk *blk;
+	uint32_t enc_id;
+	enum dpu_hw_blk_type type;
+};
+
+static void dpu_rm_init_hw_iter(
 		struct dpu_rm_hw_iter *iter,
 		uint32_t enc_id,
 		enum dpu_hw_blk_type type)
@@ -83,7 +97,7 @@ static bool _dpu_rm_get_hw_locked(struct dpu_rm *rm, struct dpu_rm_hw_iter *i)
 	return false;
 }
 
-bool dpu_rm_get_hw(struct dpu_rm *rm, struct dpu_rm_hw_iter *i)
+static bool dpu_rm_get_hw(struct dpu_rm *rm, struct dpu_rm_hw_iter *i)
 {
 	bool ret;
 
@@ -635,3 +649,16 @@ int dpu_rm_reserve(
 
 	return ret;
 }
+
+int dpu_rm_get_assigned_resources(struct dpu_rm *rm, uint32_t enc_id,
+	enum dpu_hw_blk_type type, struct dpu_hw_blk **blks, int blks_size)
+{
+	struct dpu_rm_hw_iter hw_iter;
+	int num_blks = 0;
+
+	dpu_rm_init_hw_iter(&hw_iter, enc_id, type);
+	while (num_blks < blks_size && dpu_rm_get_hw(rm, &hw_iter))
+		blks[num_blks++] = hw_iter.blk->hw;
+
+	return num_blks;
+}

drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h

@@ -24,26 +24,6 @@ struct dpu_rm {
 	struct mutex rm_lock;
 };
 
-/**
- *  struct dpu_rm_hw_blk - resource manager internal structure
- *	forward declaration for single iterator definition without void pointer
- */
-struct dpu_rm_hw_blk;
-
-/**
- * struct dpu_rm_hw_iter - iterator for use with dpu_rm
- * @hw: dpu_hw object requested, or NULL on failure
- * @blk: dpu_rm internal block representation. Clients ignore. Used as iterator.
- * @enc_id: DRM ID of Encoder client wishes to search for, or 0 for Any Encoder
- * @type: Hardware Block Type client wishes to search for.
- */
-struct dpu_rm_hw_iter {
-	void *hw;
-	struct dpu_rm_hw_blk *blk;
-	uint32_t enc_id;
-	enum dpu_hw_blk_type type;
-};
-
 /**
  * dpu_rm_init - Read hardware catalog and create reservation tracking objects
  *	for all HW blocks.
@@ -93,28 +73,9 @@ int dpu_rm_reserve(struct dpu_rm *rm,
 void dpu_rm_release(struct dpu_rm *rm, struct drm_encoder *enc);
 
 /**
- * dpu_rm_init_hw_iter - setup given iterator for new iteration over hw list
- *	using dpu_rm_get_hw
- * @iter: iter object to initialize
- * @enc_id: DRM ID of Encoder client wishes to search for, or 0 for Any Encoder
- * @type: Hardware Block Type client wishes to search for.
+ * Get hw resources of the given type that are assigned to this encoder.
  */
-void dpu_rm_init_hw_iter(
-		struct dpu_rm_hw_iter *iter,
-		uint32_t enc_id,
-		enum dpu_hw_blk_type type);
-/**
- * dpu_rm_get_hw - retrieve reserved hw object given encoder and hw type
- *	Meant to do a single pass through the hardware list to iteratively
- *	retrieve hardware blocks of a given type for a given encoder.
- *	Initialize an iterator object.
- *	Set hw block type of interest. Set encoder id of interest, 0 for any.
- *	Function returns first hw of type for that encoder.
- *	Subsequent calls will return the next reserved hw of that type in-order.
- *	Iterator HW pointer will be null on failure to find hw.
- * @rm: DPU Resource Manager handle
- * @iter: iterator object
- * @Return: true on match found, false on no match found
- */
-bool dpu_rm_get_hw(struct dpu_rm *rm, struct dpu_rm_hw_iter *iter);
+int dpu_rm_get_assigned_resources(struct dpu_rm *rm, uint32_t enc_id,
+	enum dpu_hw_blk_type type, struct dpu_hw_blk **blks, int blks_size);
 #endif /* __DPU_RM_H__ */
+