[PATCH v5] drm/msm/dpu: add current resource allocation to dumped state

[Dmitry Baryshkov]

Provide atomic_print_state callback to the DPU's private object. This
way the debugfs/dri/0/state will also include RM's internal state.

Example output (RB5 board, HDMI and writeback encoder enabled)

resource mapping:
	pingpong=31 36 # # # # - - - - -
	mixer=31 36 # # # # -
	ctl=# # 31 36 # #
	dspp=# # # #
	dsc=# # # # - -
	cdm=#

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
Changes in v5:
- Extracted the common helper for printing RM state
- Changed the code to print '#' for unused/unmapped blocks (Abhinav)
- Link to v4: https://lore.kernel.org/r/20240219-fd-rm-state-v4-1-b47f14ef27c2@linaro.org

Changes in v4:
- Split the patch from the virual wide planes series
- Reworked the output format
- Added the CDM block into the dump
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 12 +++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h |  2 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c  | 56 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h  |  8 +++++
 4 files changed, 78 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 723cc1d82143..9f3697e1eacb 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -353,9 +353,18 @@ static void dpu_kms_global_destroy_state(struct drm_private_obj *obj,
 	kfree(dpu_state);
 }
 
+static void dpu_kms_global_print_state(struct drm_printer *p,
+				       const struct drm_private_state *state)
+{
+	const struct dpu_global_state *global_state = to_dpu_global_state(state);
+
+	dpu_rm_print_state(p, global_state);
+}
+
 static const struct drm_private_state_funcs dpu_kms_global_state_funcs = {
 	.atomic_duplicate_state = dpu_kms_global_duplicate_state,
 	.atomic_destroy_state = dpu_kms_global_destroy_state,
+	.atomic_print_state = dpu_kms_global_print_state,
 };
 
 static int dpu_kms_global_obj_init(struct dpu_kms *dpu_kms)
@@ -371,6 +380,9 @@ static int dpu_kms_global_obj_init(struct dpu_kms *dpu_kms)
 	drm_atomic_private_obj_init(dpu_kms->dev, &dpu_kms->global_state,
 				    &state->base,
 				    &dpu_kms_global_state_funcs);
+
+	state->rm = &dpu_kms->rm;
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index d1207f4ec3ae..2512c9bd08df 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -131,6 +131,8 @@ struct vsync_info {
 struct dpu_global_state {
 	struct drm_private_state base;
 
+	struct dpu_rm *rm;
+
 	uint32_t pingpong_to_enc_id[PINGPONG_MAX - PINGPONG_0];
 	uint32_t mixer_to_enc_id[LM_MAX - LM_0];
 	uint32_t ctl_to_enc_id[CTL_MAX - CTL_0];
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index 724537ab776d..1a56ddca536d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -634,3 +634,59 @@ int dpu_rm_get_assigned_resources(struct dpu_rm *rm,
 
 	return num_blks;
 }
+
+static void dpu_rm_print_state_helper(struct drm_printer *p,
+					    struct dpu_hw_blk *blk,
+					    uint32_t mapping)
+{
+	if (!blk)
+		drm_puts(p, "- ");
+	else if (!mapping)
+		drm_puts(p, "# ");
+	else
+		drm_printf(p, "%d ", mapping);
+}
+
+
+void dpu_rm_print_state(struct drm_printer *p,
+			const struct dpu_global_state *global_state)
+{
+	const struct dpu_rm *rm = global_state->rm;
+	int i;
+
+	drm_puts(p, "resource mapping:\n");
+	drm_puts(p, "\tpingpong=");
+	for (i = 0; i < ARRAY_SIZE(global_state->pingpong_to_enc_id); i++)
+		dpu_rm_print_state_helper(p, rm->pingpong_blks[i],
+					  global_state->pingpong_to_enc_id[i]);
+	drm_puts(p, "\n");
+
+	drm_puts(p, "\tmixer=");
+	for (i = 0; i < ARRAY_SIZE(global_state->mixer_to_enc_id); i++)
+		dpu_rm_print_state_helper(p, rm->mixer_blks[i],
+					  global_state->mixer_to_enc_id[i]);
+	drm_puts(p, "\n");
+
+	drm_puts(p, "\tctl=");
+	for (i = 0; i < ARRAY_SIZE(global_state->ctl_to_enc_id); i++)
+		dpu_rm_print_state_helper(p, rm->ctl_blks[i],
+					  global_state->ctl_to_enc_id[i]);
+	drm_puts(p, "\n");
+
+	drm_puts(p, "\tdspp=");
+	for (i = 0; i < ARRAY_SIZE(global_state->dspp_to_enc_id); i++)
+		dpu_rm_print_state_helper(p, rm->dspp_blks[i],
+					  global_state->dspp_to_enc_id[i]);
+	drm_puts(p, "\n");
+
+	drm_puts(p, "\tdsc=");
+	for (i = 0; i < ARRAY_SIZE(global_state->dsc_to_enc_id); i++)
+		dpu_rm_print_state_helper(p, rm->dsc_blks[i],
+					  global_state->dsc_to_enc_id[i]);
+	drm_puts(p, "\n");
+
+	drm_puts(p, "\tcdm=");
+	dpu_rm_print_state_helper(p, rm->cdm_blk,
+				  global_state->cdm_to_enc_id);
+	drm_puts(p, "\n");
+}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
index e3f83ebc656b..e63db8ace6b9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
@@ -89,6 +89,14 @@ int dpu_rm_get_assigned_resources(struct dpu_rm *rm,
 	struct dpu_global_state *global_state, uint32_t enc_id,
 	enum dpu_hw_blk_type type, struct dpu_hw_blk **blks, int blks_size);
 
+/**
+ * dpu_rm_print_state - output the RM private state
+ * @p: DRM printer
+ * @global_state: global state
+ */
+void dpu_rm_print_state(struct drm_printer *p,
+			const struct dpu_global_state *global_state);
+
 /**
  * dpu_rm_get_intf - Return a struct dpu_hw_intf instance given it's index.
  * @rm: DPU Resource Manager handle

---
base-commit: 41c177cf354126a22443b5c80cec9fdd313e67e1
change-id: 20240219-fd-rm-state-bd1218954b78

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov at linaro.org>