Re: [PATCH 5/6] drm/msm/dpu: remove struct dpu_encoder_irq

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On 2/1/2022 7:10 AM, Dmitry Baryshkov wrote:
Remove additional indirection: specify IRQ callbacks and IRQ indices
directly rather than through the pointer in the irq structure. For each
IRQ we have a constant IRQ callback. This change simplifies code review
as the reader no longer needs to remember which function is called.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

The change itself is fine as it will help to reduce yet another struct
struct dpu_encoder_irq.

One suggestion I can think of is, this also gets rid of the "name" member which can be useful for debugging.

Do you think we can add a helper dpu_encoder_irq_idx_to_name(int idx)

Which will just translate this enum to the relevant string and add that to the prints which were previously using the "name" member?

156 enum dpu_intr_idx {
157 	INTR_IDX_VSYNC,
158 	INTR_IDX_PINGPONG,
159 	INTR_IDX_UNDERRUN,
160 	INTR_IDX_CTL_START,
161 	INTR_IDX_RDPTR,
162 	INTR_IDX_MAX,
163 };

Let me know if you think this will be useful.

---
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   | 28 +++----
  .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h  | 21 +-----
  .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c  | 73 +++++++------------
  .../drm/msm/disp/dpu1/dpu_encoder_phys_vid.c  | 42 ++++-------
  4 files changed, 58 insertions(+), 106 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index dbcbf96cf8eb..83b6715820fa 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -261,9 +261,10 @@ static int dpu_encoder_helper_wait_event_timeout(int32_t drm_id,
int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
  		enum dpu_intr_idx intr_idx,
+		void (*func)(void *arg, int irq_idx),
  		struct dpu_encoder_wait_info *wait_info)
  {
-	struct dpu_encoder_irq *irq;
+	int irq;
  	u32 irq_status;
  	int ret;
@@ -271,7 +272,7 @@ int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
  		DPU_ERROR("invalid params\n");
  		return -EINVAL;
  	}
-	irq = &phys_enc->irq[intr_idx];
+	irq = phys_enc->irq[intr_idx];
/* note: do master / slave checking outside */ @@ -279,53 +280,52 @@ int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
  	if (phys_enc->enable_state == DPU_ENC_DISABLED) {
  		DRM_ERROR("encoder is disabled id=%u, intr=%d, irq=%d\n",
  			  DRMID(phys_enc->parent), intr_idx,
-			  irq->irq_idx);
+			  irq);
  		return -EWOULDBLOCK;
  	}
- if (irq->irq_idx < 0) {
-		DRM_DEBUG_KMS("skip irq wait id=%u, intr=%d, irq=%s\n",
-			      DRMID(phys_enc->parent), intr_idx,
-			      irq->name);
+	if (irq < 0) {
+		DRM_DEBUG_KMS("skip irq wait id=%u, intr=%d\n",
+			      DRMID(phys_enc->parent), intr_idx);
  		return 0;
  	}
DRM_DEBUG_KMS("id=%u, intr=%d, irq=%d, pp=%d, pending_cnt=%d\n",
  		      DRMID(phys_enc->parent), intr_idx,
-		      irq->irq_idx, phys_enc->hw_pp->idx - PINGPONG_0,
+		      irq, phys_enc->hw_pp->idx - PINGPONG_0,
  		      atomic_read(wait_info->atomic_cnt));
ret = dpu_encoder_helper_wait_event_timeout(
  			DRMID(phys_enc->parent),
-			irq->irq_idx,
+			irq,
  			wait_info);
if (ret <= 0) {
-		irq_status = dpu_core_irq_read(phys_enc->dpu_kms, irq->irq_idx);
+		irq_status = dpu_core_irq_read(phys_enc->dpu_kms, irq);
  		if (irq_status) {
  			unsigned long flags;
DRM_DEBUG_KMS("irq not triggered id=%u, intr=%d, irq=%d, pp=%d, atomic_cnt=%d\n",
  				      DRMID(phys_enc->parent), intr_idx,
-				      irq->irq_idx,
+				      irq,
  				      phys_enc->hw_pp->idx - PINGPONG_0,
  				      atomic_read(wait_info->atomic_cnt));
  			local_irq_save(flags);
-			irq->func(phys_enc, irq->irq_idx);
+			func(phys_enc, irq);
  			local_irq_restore(flags);
  			ret = 0;
  		} else {
  			ret = -ETIMEDOUT;
  			DRM_DEBUG_KMS("irq timeout id=%u, intr=%d, irq=%d, pp=%d, atomic_cnt=%d\n",
  				      DRMID(phys_enc->parent), intr_idx,
-				      irq->irq_idx,
+				      irq,
  				      phys_enc->hw_pp->idx - PINGPONG_0,
  				      atomic_read(wait_info->atomic_cnt));
  		}
  	} else {
  		ret = 0;
  		trace_dpu_enc_irq_wait_success(DRMID(phys_enc->parent),
-			intr_idx, irq->irq_idx,
+			intr_idx, irq,
  			phys_enc->hw_pp->idx - PINGPONG_0,
  			atomic_read(wait_info->atomic_cnt));
  	}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
index ff2218155b44..803fd6f25da1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
@@ -162,21 +162,6 @@ enum dpu_intr_idx {
  	INTR_IDX_MAX,
  };
-/**
- * dpu_encoder_irq - tracking structure for interrupts
- * @name:		string name of interrupt
- * @intr_idx:		Encoder interrupt enumeration
- * @irq_idx:		IRQ interface lookup index from DPU IRQ framework
- *			will be -EINVAL if IRQ is not registered
- * @irq_cb:		interrupt callback
- */
-struct dpu_encoder_irq {
-	const char *name;
-	enum dpu_intr_idx intr_idx;
-	int irq_idx;
-	void (*func)(void *arg, int irq_idx);
-};
-
  /**
   * struct dpu_encoder_phys - physical encoder that drives a single INTF block
   *	tied to a specific panel / sub-panel. Abstract type, sub-classed by
@@ -207,7 +192,7 @@ struct dpu_encoder_irq {
   * @pending_ctlstart_cnt:	Atomic counter tracking the number of ctl start
   *                              pending.
   * @pending_kickoff_wq:		Wait queue for blocking until kickoff completes
- * @irq:			IRQ tracking structures
+ * @irq:			IRQ indices
   */
  struct dpu_encoder_phys {
  	struct drm_encoder *parent;
@@ -231,7 +216,7 @@ struct dpu_encoder_phys {
  	atomic_t pending_ctlstart_cnt;
  	atomic_t pending_kickoff_cnt;
  	wait_queue_head_t pending_kickoff_wq;
-	struct dpu_encoder_irq irq[INTR_IDX_MAX];
+	int irq[INTR_IDX_MAX];
  };
static inline int dpu_encoder_phys_inc_pending(struct dpu_encoder_phys *phys)
@@ -357,11 +342,13 @@ void dpu_encoder_helper_report_irq_timeout(struct dpu_encoder_phys *phys_enc,
   *	note: will call dpu_encoder_helper_wait_for_irq on timeout
   * @phys_enc: Pointer to physical encoder structure
   * @intr_idx: encoder interrupt index
+ * @func: IRQ callback to be called in case of timeout
   * @wait_info: wait info struct
   * @Return: 0 or -ERROR
   */
  int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
  		enum dpu_intr_idx intr_idx,
+		void (*func)(void *arg, int irq_idx),
  		struct dpu_encoder_wait_info *wait_info);
#endif /* __dpu_encoder_phys_H__ */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
index ca7d557312ff..9987a129a32c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
@@ -151,7 +151,6 @@ static void dpu_encoder_phys_cmd_mode_set(
  {
  	struct dpu_encoder_phys_cmd *cmd_enc =
  		to_dpu_encoder_phys_cmd(phys_enc);
-	struct dpu_encoder_irq *irq;
if (!mode || !adj_mode) {
  		DPU_ERROR("invalid args\n");
@@ -161,17 +160,13 @@ static void dpu_encoder_phys_cmd_mode_set(
  	DPU_DEBUG_CMDENC(cmd_enc, "caching mode:\n");
  	drm_mode_debug_printmodeline(adj_mode);
- irq = &phys_enc->irq[INTR_IDX_CTL_START];
-	irq->irq_idx = phys_enc->hw_ctl->caps->intr_start;
+	phys_enc->irq[INTR_IDX_CTL_START] = phys_enc->hw_ctl->caps->intr_start;
- irq = &phys_enc->irq[INTR_IDX_PINGPONG];
-	irq->irq_idx = phys_enc->hw_pp->caps->intr_done;
+	phys_enc->irq[INTR_IDX_PINGPONG] = phys_enc->hw_pp->caps->intr_done;
- irq = &phys_enc->irq[INTR_IDX_RDPTR];
-	irq->irq_idx = phys_enc->hw_pp->caps->intr_rdptr;
+	phys_enc->irq[INTR_IDX_RDPTR] = phys_enc->hw_pp->caps->intr_rdptr;
- irq = &phys_enc->irq[INTR_IDX_UNDERRUN];
-	irq->irq_idx = phys_enc->hw_intf->cap->intr_underrun;
+	phys_enc->irq[INTR_IDX_UNDERRUN] = phys_enc->hw_intf->cap->intr_underrun;
  }
static int _dpu_encoder_phys_cmd_handle_ppdone_timeout(
@@ -212,7 +207,7 @@ static int _dpu_encoder_phys_cmd_handle_ppdone_timeout(
  			  atomic_read(&phys_enc->pending_kickoff_cnt));
  		msm_disp_snapshot_state(drm_enc->dev);
  		dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_RDPTR].irq_idx);
+				phys_enc->irq[INTR_IDX_RDPTR]);
  	}
atomic_add_unless(&phys_enc->pending_kickoff_cnt, -1, 0);
@@ -240,6 +235,7 @@ static int _dpu_encoder_phys_cmd_wait_for_idle(
  	wait_info.timeout_ms = KICKOFF_TIMEOUT_MS;
ret = dpu_encoder_helper_wait_for_irq(phys_enc, INTR_IDX_PINGPONG,
+			dpu_encoder_phys_cmd_pp_tx_done_irq,
  			&wait_info);
  	if (ret == -ETIMEDOUT)
  		_dpu_encoder_phys_cmd_handle_ppdone_timeout(phys_enc);
@@ -279,11 +275,12 @@ static int dpu_encoder_phys_cmd_control_vblank_irq(
if (enable && atomic_inc_return(&phys_enc->vblank_refcount) == 1)
  		ret = dpu_core_irq_register_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_RDPTR].irq_idx,
-				phys_enc->irq[INTR_IDX_RDPTR].func, phys_enc);
+				phys_enc->irq[INTR_IDX_RDPTR],
+				dpu_encoder_phys_cmd_pp_rd_ptr_irq,
+				phys_enc);
  	else if (!enable && atomic_dec_return(&phys_enc->vblank_refcount) == 0)
  		ret = dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_RDPTR].irq_idx);
+				phys_enc->irq[INTR_IDX_RDPTR]);
end:
  	if (ret) {
@@ -305,27 +302,30 @@ static void dpu_encoder_phys_cmd_irq_control(struct dpu_encoder_phys *phys_enc,
if (enable) {
  		dpu_core_irq_register_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_PINGPONG].irq_idx,
-				phys_enc->irq[INTR_IDX_PINGPONG].func, phys_enc);
+				phys_enc->irq[INTR_IDX_PINGPONG],
+				dpu_encoder_phys_cmd_pp_tx_done_irq,
+				phys_enc);
  		dpu_core_irq_register_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_UNDERRUN].irq_idx,
-				phys_enc->irq[INTR_IDX_UNDERRUN].func, phys_enc);
+				phys_enc->irq[INTR_IDX_UNDERRUN],
+				dpu_encoder_phys_cmd_underrun_irq,
+				phys_enc);
  		dpu_encoder_phys_cmd_control_vblank_irq(phys_enc, true);
if (dpu_encoder_phys_cmd_is_master(phys_enc))
  			dpu_core_irq_register_callback(phys_enc->dpu_kms,
-					phys_enc->irq[INTR_IDX_CTL_START].irq_idx,
-					phys_enc->irq[INTR_IDX_CTL_START].func, phys_enc);
+					phys_enc->irq[INTR_IDX_CTL_START],
+					dpu_encoder_phys_cmd_ctl_start_irq,
+					phys_enc);
  	} else {
  		if (dpu_encoder_phys_cmd_is_master(phys_enc))
  			dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-					phys_enc->irq[INTR_IDX_CTL_START].irq_idx);
+					phys_enc->irq[INTR_IDX_CTL_START]);
dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_UNDERRUN].irq_idx);
+				phys_enc->irq[INTR_IDX_UNDERRUN]);
  		dpu_encoder_phys_cmd_control_vblank_irq(phys_enc, false);
  		dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_PINGPONG].irq_idx);
+				phys_enc->irq[INTR_IDX_PINGPONG]);
  	}
  }
@@ -660,6 +660,7 @@ static int _dpu_encoder_phys_cmd_wait_for_ctl_start(
  	wait_info.timeout_ms = KICKOFF_TIMEOUT_MS;
ret = dpu_encoder_helper_wait_for_irq(phys_enc, INTR_IDX_CTL_START,
+			dpu_encoder_phys_cmd_ctl_start_irq,
  			&wait_info);
  	if (ret == -ETIMEDOUT) {
  		DPU_ERROR_CMDENC(cmd_enc, "ctl start interrupt wait failed\n");
@@ -715,6 +716,7 @@ static int dpu_encoder_phys_cmd_wait_for_vblank(
  	atomic_inc(&cmd_enc->pending_vblank_cnt);
rc = dpu_encoder_helper_wait_for_irq(phys_enc, INTR_IDX_RDPTR,
+			dpu_encoder_phys_cmd_pp_rd_ptr_irq,
  			&wait_info);
return rc;
@@ -766,7 +768,6 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(
  {
  	struct dpu_encoder_phys *phys_enc = NULL;
  	struct dpu_encoder_phys_cmd *cmd_enc = NULL;
-	struct dpu_encoder_irq *irq;
  	int i, ret = 0;
DPU_DEBUG("intf %d\n", p->intf_idx - INTF_0);
@@ -790,30 +791,8 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(
  	phys_enc->enc_spinlock = p->enc_spinlock;
  	cmd_enc->stream_sel = 0;
  	phys_enc->enable_state = DPU_ENC_DISABLED;
-	for (i = 0; i < INTR_IDX_MAX; i++) {
-		irq = &phys_enc->irq[i];
-		irq->irq_idx = -EINVAL;
-	}
-
-	irq = &phys_enc->irq[INTR_IDX_CTL_START];
-	irq->name = "ctl_start";
-	irq->intr_idx = INTR_IDX_CTL_START;
-	irq->func = dpu_encoder_phys_cmd_ctl_start_irq;
-
-	irq = &phys_enc->irq[INTR_IDX_PINGPONG];
-	irq->name = "pp_done";
-	irq->intr_idx = INTR_IDX_PINGPONG;
-	irq->func = dpu_encoder_phys_cmd_pp_tx_done_irq;
-
-	irq = &phys_enc->irq[INTR_IDX_RDPTR];
-	irq->name = "pp_rd_ptr";
-	irq->intr_idx = INTR_IDX_RDPTR;
-	irq->func = dpu_encoder_phys_cmd_pp_rd_ptr_irq;
-
-	irq = &phys_enc->irq[INTR_IDX_UNDERRUN];
-	irq->name = "underrun";
-	irq->intr_idx = INTR_IDX_UNDERRUN;
-	irq->func = dpu_encoder_phys_cmd_underrun_irq;
+	for (i = 0; i < INTR_IDX_MAX; i++)
+		phys_enc->irq[i] = -EINVAL;
atomic_set(&phys_enc->vblank_refcount, 0);
  	atomic_set(&phys_enc->pending_kickoff_cnt, 0);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index 50c063de1509..d80b2f80fec9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -366,19 +366,15 @@ static void dpu_encoder_phys_vid_mode_set(
  		struct drm_display_mode *mode,
  		struct drm_display_mode *adj_mode)
  {
-	struct dpu_encoder_irq *irq;
-
  	if (adj_mode) {
  		phys_enc->cached_mode = *adj_mode;
  		drm_mode_debug_printmodeline(adj_mode);
  		DPU_DEBUG_VIDENC(phys_enc, "caching mode:\n");
  	}
- irq = &phys_enc->irq[INTR_IDX_VSYNC];
-	irq->irq_idx = phys_enc->hw_intf->cap->intr_vsync;
+	phys_enc->irq[INTR_IDX_VSYNC] = phys_enc->hw_intf->cap->intr_vsync;
- irq = &phys_enc->irq[INTR_IDX_UNDERRUN];
-	irq->irq_idx = phys_enc->hw_intf->cap->intr_underrun;
+	phys_enc->irq[INTR_IDX_UNDERRUN] = phys_enc->hw_intf->cap->intr_underrun;
  }
static int dpu_encoder_phys_vid_control_vblank_irq(
@@ -405,11 +401,12 @@ static int dpu_encoder_phys_vid_control_vblank_irq(
if (enable && atomic_inc_return(&phys_enc->vblank_refcount) == 1)
  		ret = dpu_core_irq_register_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_VSYNC].irq_idx,
-				phys_enc->irq[INTR_IDX_VSYNC].func, phys_enc);
+				phys_enc->irq[INTR_IDX_VSYNC],
+				dpu_encoder_phys_vid_vblank_irq,
+				phys_enc);
  	else if (!enable && atomic_dec_return(&phys_enc->vblank_refcount) == 0)
  		ret = dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_VSYNC].irq_idx);
+				phys_enc->irq[INTR_IDX_VSYNC]);
end:
  	if (ret) {
@@ -490,6 +487,7 @@ static int dpu_encoder_phys_vid_wait_for_vblank(
/* Wait for kickoff to complete */
  	ret = dpu_encoder_helper_wait_for_irq(phys_enc, INTR_IDX_VSYNC,
+			dpu_encoder_phys_vid_vblank_irq,
  			&wait_info);
if (ret == -ETIMEDOUT) {
@@ -542,7 +540,7 @@ static void dpu_encoder_phys_vid_prepare_for_kickoff(
  				ctl->idx, rc);
  		msm_disp_snapshot_state(drm_enc->dev);
  		dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_VSYNC].irq_idx);
+				phys_enc->irq[INTR_IDX_VSYNC]);
  	}
  }
@@ -632,12 +630,13 @@ static void dpu_encoder_phys_vid_irq_control(struct dpu_encoder_phys *phys_enc,
  			return;
dpu_core_irq_register_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_UNDERRUN].irq_idx,
-				phys_enc->irq[INTR_IDX_UNDERRUN].func, phys_enc);
+				phys_enc->irq[INTR_IDX_UNDERRUN],
+				dpu_encoder_phys_vid_underrun_irq,
+				phys_enc);
  	} else {
  		dpu_encoder_phys_vid_control_vblank_irq(phys_enc, false);
  		dpu_core_irq_unregister_callback(phys_enc->dpu_kms,
-				phys_enc->irq[INTR_IDX_UNDERRUN].irq_idx);
+				phys_enc->irq[INTR_IDX_UNDERRUN]);
  	}
  }
@@ -703,7 +702,6 @@ struct dpu_encoder_phys *dpu_encoder_phys_vid_init(
  		struct dpu_enc_phys_init_params *p)
  {
  	struct dpu_encoder_phys *phys_enc = NULL;
-	struct dpu_encoder_irq *irq;
  	int i;
if (!p) {
@@ -729,20 +727,8 @@ struct dpu_encoder_phys *dpu_encoder_phys_vid_init(
  	phys_enc->split_role = p->split_role;
  	phys_enc->intf_mode = INTF_MODE_VIDEO;
  	phys_enc->enc_spinlock = p->enc_spinlock;
-	for (i = 0; i < INTR_IDX_MAX; i++) {
-		irq = &phys_enc->irq[i];
-		irq->irq_idx = -EINVAL;
-	}
-
-	irq = &phys_enc->irq[INTR_IDX_VSYNC];
-	irq->name = "vsync_irq";
-	irq->intr_idx = INTR_IDX_VSYNC;
-	irq->func = dpu_encoder_phys_vid_vblank_irq;
-
-	irq = &phys_enc->irq[INTR_IDX_UNDERRUN];
-	irq->name = "underrun";
-	irq->intr_idx = INTR_IDX_UNDERRUN;
-	irq->func = dpu_encoder_phys_vid_underrun_irq;
+	for (i = 0; i < INTR_IDX_MAX; i++)
+		phys_enc->irq[i] = -EINVAL;
atomic_set(&phys_enc->vblank_refcount, 0);
  	atomic_set(&phys_enc->pending_kickoff_cnt, 0);



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