Revert "net: stmmac: Enable Per DMA Channel interrupt"

Revert "net: stmmac: Use interrupt mode INTM=1 for per channel irq"
This reverts commit 36af9f25ddfd311da82628f194c794786467cb12.
Revert "net: stmmac: Add support for TX/RX channel interrupt"
This reverts commit 9072e03d32088137a435ddf3aa95fd6e038d69d8.
Revert "net: stmmac: Make MSI interrupt routine generic"
This reverts commit 477bd4beb93bf9ace9bda71f1437b191befa9cf4.
Revert "dt-bindings: net: snps,dwmac: per channel irq"
This reverts commit 67d47c8ada0f8795bfcdb85cc8f2ad3ce556674b.

Device tree bindings need to be reviewed.

Link: https://lore.kernel.org/all/[e-mail]/
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/snps,dwmac.yaml

···
 
   interrupts:
     minItems: 1
-    maxItems: 19
+    items:
+      - description: Combined signal for various interrupt events
+      - description: The interrupt to manage the remote wake-up packet detection
+      - description: The interrupt that occurs when Rx exits the LPI state
 
   interrupt-names:
     minItems: 1
-    maxItems: 19
     items:
-      oneOf:
-        - description: Combined signal for various interrupt events
-          const: macirq
-        - description: The interrupt to manage the remote wake-up packet detection
-          const: eth_wake_irq
-        - description: The interrupt that occurs when Rx exits the LPI state
-          const: eth_lpi
-        - description: DMA Tx per-channel interrupt
-          pattern: '^dma_tx[0-7]?$'
-        - description: DMA Rx per-channel interrupt
-          pattern: '^dma_rx[0-7]?$'
-
-    allOf:
-      - contains:
-          const: macirq
+      - const: macirq
+      - enum: [eth_wake_irq, eth_lpi]
+      - const: eth_lpi
 
   clocks:
     minItems: 1

drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c

···
 
 	res->irq = pci_irq_vector(pdev, 0);
 	res->wol_irq = res->irq;
-	plat->flags &= ~STMMAC_FLAG_MULTI_IRQ_EN;
+	plat->flags &= ~STMMAC_FLAG_MULTI_MSI_EN;
 	dev_info(&pdev->dev, "%s: Single IRQ enablement successful\n",
 		 __func__);
 
···
 	if (plat->msi_sfty_ue_vec < STMMAC_MSI_VEC_MAX)
 		res->sfty_ue_irq = pci_irq_vector(pdev, plat->msi_sfty_ue_vec);
 
-	plat->flags |= STMMAC_FLAG_MULTI_IRQ_EN;
+	plat->flags |= STMMAC_FLAG_MULTI_MSI_EN;
 	dev_info(&pdev->dev, "%s: multi MSI enablement successful\n", __func__);
 
 	return 0;

drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c

···
 	plat_dat->bsp_priv = dwmac;
 	plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;
 
-	if (stmmac_res.rx_irq[0] > 0 && stmmac_res.tx_irq[0] > 0)
-		plat_dat->flags |= STMMAC_FLAG_MULTI_IRQ_EN;
-
 	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 	if (ret)
 		return ret;

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c

···
 
 	value = readl(ioaddr + DMA_BUS_MODE);
 
-	if (dma_cfg->multi_irq_en) {
+	if (dma_cfg->multi_msi_en) {
 		value &= ~DMA_BUS_MODE_INTM_MASK;
 		value |= (DMA_BUS_MODE_INTM_MODE1 << DMA_BUS_MODE_INTM_SHIFT);
 	}

drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h

···
 /* DMA Registers */
 #define XGMAC_DMA_MODE			0x00003000
 #define XGMAC_SWR			BIT(0)
-#define XGMAC_DMA_MODE_INTM_MASK	GENMASK(13, 12)
-#define XGMAC_DMA_MODE_INTM_SHIFT	12
-#define XGMAC_DMA_MODE_INTM_MODE1	0x1
 #define XGMAC_DMA_SYSBUS_MODE		0x00003004
 #define XGMAC_WR_OSR_LMT		GENMASK(29, 24)
 #define XGMAC_WR_OSR_LMT_SHIFT		24

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c

···
 		value |= XGMAC_EAME;
 
 	writel(value, ioaddr + XGMAC_DMA_SYSBUS_MODE);
-
-	if (dma_cfg->multi_irq_en) {
-		value = readl(ioaddr + XGMAC_DMA_MODE);
-		value &= ~XGMAC_DMA_MODE_INTM_MASK;
-		value |= (XGMAC_DMA_MODE_INTM_MODE1 << XGMAC_DMA_MODE_INTM_SHIFT);
-		writel(value, ioaddr + XGMAC_DMA_MODE);
-	}
 }
 
 static void dwxgmac2_dma_init_chan(struct stmmac_priv *priv,
···
 	}
 
 	/* TX/RX NORMAL interrupts */
-	if (likely(intr_status & XGMAC_RI)) {
-		u64_stats_update_begin(&rxq_stats->syncp);
-		rxq_stats->rx_normal_irq_n++;
-		u64_stats_update_end(&rxq_stats->syncp);
-		ret |= handle_rx;
-	}
-
-	if (likely(intr_status & (XGMAC_TI | XGMAC_TBU))) {
-		u64_stats_update_begin(&txq_stats->syncp);
-		txq_stats->tx_normal_irq_n++;
-		u64_stats_update_end(&txq_stats->syncp);
-		ret |= handle_tx;
+	if (likely(intr_status & XGMAC_NIS)) {
+		if (likely(intr_status & XGMAC_RI)) {
+			u64_stats_update_begin(&rxq_stats->syncp);
+			rxq_stats->rx_normal_irq_n++;
+			u64_stats_update_end(&rxq_stats->syncp);
+			ret |= handle_rx;
+		}
+		if (likely(intr_status & (XGMAC_TI | XGMAC_TBU))) {
+			u64_stats_update_begin(&txq_stats->syncp);
+			txq_stats->tx_normal_irq_n++;
+			u64_stats_update_end(&txq_stats->syncp);
+			ret |= handle_tx;
+		}
 	}
 
 	/* Clear interrupts */

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

···
 /* For MSI interrupts handling */
 static irqreturn_t stmmac_mac_interrupt(int irq, void *dev_id);
 static irqreturn_t stmmac_safety_interrupt(int irq, void *dev_id);
-static irqreturn_t stmmac_dma_tx_interrupt(int irq, void *data);
-static irqreturn_t stmmac_dma_rx_interrupt(int irq, void *data);
+static irqreturn_t stmmac_msi_intr_tx(int irq, void *data);
+static irqreturn_t stmmac_msi_intr_rx(int irq, void *data);
 static void stmmac_reset_rx_queue(struct stmmac_priv *priv, u32 queue);
 static void stmmac_reset_tx_queue(struct stmmac_priv *priv, u32 queue);
 static void stmmac_reset_queues_param(struct stmmac_priv *priv);
···
 	}
 }
 
-static int stmmac_request_irq_multi(struct net_device *dev)
+static int stmmac_request_irq_multi_msi(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 	enum request_irq_err irq_err;
···
 		}
 	}
 
-	/* Request Rx irq */
+	/* Request Rx MSI irq */
 	for (i = 0; i < priv->plat->rx_queues_to_use; i++) {
 		if (i >= MTL_MAX_RX_QUEUES)
 			break;
···
 		int_name = priv->int_name_rx_irq[i];
 		sprintf(int_name, "%s:%s-%d", dev->name, "rx", i);
 		ret = request_irq(priv->rx_irq[i],
-				  stmmac_dma_rx_interrupt,
+				  stmmac_msi_intr_rx,
 				  0, int_name, &priv->dma_conf.rx_queue[i]);
 		if (unlikely(ret < 0)) {
 			netdev_err(priv->dev,
-				   "%s: alloc rx-%d  dma rx_irq %d (error: %d)\n",
+				   "%s: alloc rx-%d  MSI %d (error: %d)\n",
 				   __func__, i, priv->rx_irq[i], ret);
 			irq_err = REQ_IRQ_ERR_RX;
 			irq_idx = i;
···
 		irq_set_affinity_hint(priv->rx_irq[i], &cpu_mask);
 	}
 
-	/* Request Tx irq */
+	/* Request Tx MSI irq */
 	for (i = 0; i < priv->plat->tx_queues_to_use; i++) {
 		if (i >= MTL_MAX_TX_QUEUES)
 			break;
···
 		int_name = priv->int_name_tx_irq[i];
 		sprintf(int_name, "%s:%s-%d", dev->name, "tx", i);
 		ret = request_irq(priv->tx_irq[i],
-				  stmmac_dma_tx_interrupt,
+				  stmmac_msi_intr_tx,
 				  0, int_name, &priv->dma_conf.tx_queue[i]);
 		if (unlikely(ret < 0)) {
 			netdev_err(priv->dev,
-				   "%s: alloc tx-%d  dma tx_irq %d (error: %d)\n",
+				   "%s: alloc tx-%d  MSI %d (error: %d)\n",
 				   __func__, i, priv->tx_irq[i], ret);
 			irq_err = REQ_IRQ_ERR_TX;
 			irq_idx = i;
···
 	int ret;
 
 	/* Request the IRQ lines */
-	if (priv->plat->flags & STMMAC_FLAG_MULTI_IRQ_EN)
-		ret = stmmac_request_irq_multi(dev);
+	if (priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN)
+		ret = stmmac_request_irq_multi_msi(dev);
 	else
 		ret = stmmac_request_irq_single(dev);
 
···
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t stmmac_dma_tx_interrupt(int irq, void *data)
+static irqreturn_t stmmac_msi_intr_tx(int irq, void *data)
 {
 	struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)data;
 	struct stmmac_dma_conf *dma_conf;
···
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t stmmac_dma_rx_interrupt(int irq, void *data)
+static irqreturn_t stmmac_msi_intr_rx(int irq, void *data)
 {
 	struct stmmac_rx_queue *rx_q = (struct stmmac_rx_queue *)data;
 	struct stmmac_dma_conf *dma_conf;
···
 	priv->plat = plat_dat;
 	priv->ioaddr = res->addr;
 	priv->dev->base_addr = (unsigned long)res->addr;
-	priv->plat->dma_cfg->multi_irq_en =
-		(priv->plat->flags & STMMAC_FLAG_MULTI_IRQ_EN);
+	priv->plat->dma_cfg->multi_msi_en =
+		(priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN);
 
 	priv->dev->irq = res->irq;
 	priv->wol_irq = res->wol_irq;

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

···
 int stmmac_get_platform_resources(struct platform_device *pdev,
 				  struct stmmac_resources *stmmac_res)
 {
-	char irq_name[9];
-	int i;
-	int irq;
-
 	memset(stmmac_res, 0, sizeof(*stmmac_res));
 
 	/* Get IRQ information early to have an ability to ask for deferred
···
 		if (stmmac_res->lpi_irq == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
 		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
-	}
-
-	/* For RX Channel */
-	for (i = 0; i < MTL_MAX_RX_QUEUES; i++) {
-		snprintf(irq_name, sizeof(irq_name), "dma_rx%i", i);
-		irq = platform_get_irq_byname_optional(pdev, irq_name);
-		if (irq == -EPROBE_DEFER)
-			return irq;
-		else if (irq < 0)
-			break;
-
-		stmmac_res->rx_irq[i] = irq;
-	}
-
-	/* For TX Channel */
-	for (i = 0; i < MTL_MAX_TX_QUEUES; i++) {
-		snprintf(irq_name, sizeof(irq_name), "dma_tx%i", i);
-		irq = platform_get_irq_byname_optional(pdev, irq_name);
-		if (irq == -EPROBE_DEFER)
-			return irq;
-		else if (irq < 0)
-			break;
-
-		stmmac_res->tx_irq[i] = irq;
 	}
 
 	stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);

include/linux/stmmac.h

···
 	int mixed_burst;
 	bool aal;
 	bool eame;
-	bool multi_irq_en;
+	bool multi_msi_en;
 	bool dche;
 };
 
···
 #define STMMAC_FLAG_TSO_EN			BIT(4)
 #define STMMAC_FLAG_SERDES_UP_AFTER_PHY_LINKUP	BIT(5)
 #define STMMAC_FLAG_VLAN_FAIL_Q_EN		BIT(6)
-#define STMMAC_FLAG_MULTI_IRQ_EN		BIT(7)
+#define STMMAC_FLAG_MULTI_MSI_EN		BIT(7)
 #define STMMAC_FLAG_EXT_SNAPSHOT_EN		BIT(8)
 #define STMMAC_FLAG_INT_SNAPSHOT_EN		BIT(9)
 #define STMMAC_FLAG_RX_CLK_RUNS_IN_LPI		BIT(10)