Merge branch 'txgbe-irq_domain'

Jiawen Wu says:

====================
Implement irq_domain for TXGBE

Implement irq_domain for the MAC interrupt and handle the sub-irqs.

v3 -> v4:
- fix build error

v2 -> v3:
- use macro defines instead of magic number

v1 -> v2:
- move interrupt codes to txgbe_irq.c
- add txgbe-link-irq to msic irq domain
- remove functions that are not needed
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/wangxun/libwx/wx_hw.c

@@ -1958,8 +1958,6 @@ int wx_sw_init(struct wx *wx)
 		return -ENOMEM;
 	}
 
-	wx->msix_in_use = false;
-
 	return 0;
 }
 EXPORT_SYMBOL(wx_sw_init);

drivers/net/ethernet/wangxun/libwx/wx_lib.c

@@ -1614,14 +1614,12 @@ static int wx_acquire_msix_vectors(struct wx *wx)
 	/* One for non-queue interrupts */
 	nvecs += 1;
 
-	if (!wx->msix_in_use) {
-		wx->msix_entry = kcalloc(1, sizeof(struct msix_entry),
-					 GFP_KERNEL);
-		if (!wx->msix_entry) {
-			kfree(wx->msix_q_entries);
-			wx->msix_q_entries = NULL;
-			return -ENOMEM;
-		}
+	wx->msix_entry = kcalloc(1, sizeof(struct msix_entry),
+				 GFP_KERNEL);
+	if (!wx->msix_entry) {
+		kfree(wx->msix_q_entries);
+		wx->msix_q_entries = NULL;
+		return -ENOMEM;
 	}
 
 	nvecs = pci_alloc_irq_vectors_affinity(wx->pdev, nvecs,
@@ -1931,10 +1929,8 @@ void wx_reset_interrupt_capability(struct wx *wx)
 	if (pdev->msix_enabled) {
 		kfree(wx->msix_q_entries);
 		wx->msix_q_entries = NULL;
-		if (!wx->msix_in_use) {
-			kfree(wx->msix_entry);
-			wx->msix_entry = NULL;
-		}
+		kfree(wx->msix_entry);
+		wx->msix_entry = NULL;
 	}
 	pci_free_irq_vectors(wx->pdev);
 }

drivers/net/ethernet/wangxun/libwx/wx_type.h

@@ -1047,7 +1047,6 @@ struct wx {
 	unsigned int queues_per_pool;
 	struct msix_entry *msix_q_entries;
 	struct msix_entry *msix_entry;
-	bool msix_in_use;
 	struct wx_ring_feature ring_feature[RING_F_ARRAY_SIZE];
 
 	/* misc interrupt status block */

drivers/net/ethernet/wangxun/txgbe/Makefile

@@ -9,4 +9,5 @@ obj-$(CONFIG_TXGBE) += txgbe.o
 txgbe-objs := txgbe_main.o \
               txgbe_hw.o \
               txgbe_phy.o \
+              txgbe_irq.o \
               txgbe_ethtool.o

drivers/net/ethernet/wangxun/txgbe/txgbe_irq.c

@@ -0,0 +1,269 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2015 - 2024 Beijing WangXun Technology Co., Ltd. */
+
+#include <linux/irqdomain.h>
+#include <linux/pci.h>
+
+#include "../libwx/wx_type.h"
+#include "../libwx/wx_lib.h"
+#include "../libwx/wx_hw.h"
+#include "txgbe_type.h"
+#include "txgbe_phy.h"
+#include "txgbe_irq.h"
+
+/**
+ * txgbe_irq_enable - Enable default interrupt generation settings
+ * @wx: pointer to private structure
+ * @queues: enable irqs for queues
+ **/
+void txgbe_irq_enable(struct wx *wx, bool queues)
+{
+	wr32(wx, WX_PX_MISC_IEN, TXGBE_PX_MISC_IEN_MASK);
+
+	/* unmask interrupt */
+	wx_intr_enable(wx, TXGBE_INTR_MISC);
+	if (queues)
+		wx_intr_enable(wx, TXGBE_INTR_QALL(wx));
+}
+
+/**
+ * txgbe_intr - msi/legacy mode Interrupt Handler
+ * @irq: interrupt number
+ * @data: pointer to a network interface device structure
+ **/
+static irqreturn_t txgbe_intr(int __always_unused irq, void *data)
+{
+	struct wx_q_vector *q_vector;
+	struct wx *wx  = data;
+	struct pci_dev *pdev;
+	u32 eicr;
+
+	q_vector = wx->q_vector[0];
+	pdev = wx->pdev;
+
+	eicr = wx_misc_isb(wx, WX_ISB_VEC0);
+	if (!eicr) {
+		/* shared interrupt alert!
+		 * the interrupt that we masked before the ICR read.
+		 */
+		if (netif_running(wx->netdev))
+			txgbe_irq_enable(wx, true);
+		return IRQ_NONE;        /* Not our interrupt */
+	}
+	wx->isb_mem[WX_ISB_VEC0] = 0;
+	if (!(pdev->msi_enabled))
+		wr32(wx, WX_PX_INTA, 1);
+
+	wx->isb_mem[WX_ISB_MISC] = 0;
+	/* would disable interrupts here but it is auto disabled */
+	napi_schedule_irqoff(&q_vector->napi);
+
+	/* re-enable link(maybe) and non-queue interrupts, no flush.
+	 * txgbe_poll will re-enable the queue interrupts
+	 */
+	if (netif_running(wx->netdev))
+		txgbe_irq_enable(wx, false);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * txgbe_request_msix_irqs - Initialize MSI-X interrupts
+ * @wx: board private structure
+ *
+ * Allocate MSI-X vectors and request interrupts from the kernel.
+ **/
+static int txgbe_request_msix_irqs(struct wx *wx)
+{
+	struct net_device *netdev = wx->netdev;
+	int vector, err;
+
+	for (vector = 0; vector < wx->num_q_vectors; vector++) {
+		struct wx_q_vector *q_vector = wx->q_vector[vector];
+		struct msix_entry *entry = &wx->msix_q_entries[vector];
+
+		if (q_vector->tx.ring && q_vector->rx.ring)
+			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
+				 "%s-TxRx-%d", netdev->name, entry->entry);
+		else
+			/* skip this unused q_vector */
+			continue;
+
+		err = request_irq(entry->vector, wx_msix_clean_rings, 0,
+				  q_vector->name, q_vector);
+		if (err) {
+			wx_err(wx, "request_irq failed for MSIX interrupt %s Error: %d\n",
+			       q_vector->name, err);
+			goto free_queue_irqs;
+		}
+	}
+
+	return 0;
+
+free_queue_irqs:
+	while (vector) {
+		vector--;
+		free_irq(wx->msix_q_entries[vector].vector,
+			 wx->q_vector[vector]);
+	}
+	wx_reset_interrupt_capability(wx);
+	return err;
+}
+
+/**
+ * txgbe_request_irq - initialize interrupts
+ * @wx: board private structure
+ *
+ * Attempt to configure interrupts using the best available
+ * capabilities of the hardware and kernel.
+ **/
+int txgbe_request_irq(struct wx *wx)
+{
+	struct net_device *netdev = wx->netdev;
+	struct pci_dev *pdev = wx->pdev;
+	int err;
+
+	if (pdev->msix_enabled)
+		err = txgbe_request_msix_irqs(wx);
+	else if (pdev->msi_enabled)
+		err = request_irq(wx->pdev->irq, &txgbe_intr, 0,
+				  netdev->name, wx);
+	else
+		err = request_irq(wx->pdev->irq, &txgbe_intr, IRQF_SHARED,
+				  netdev->name, wx);
+
+	if (err)
+		wx_err(wx, "request_irq failed, Error %d\n", err);
+
+	return err;
+}
+
+static int txgbe_request_gpio_irq(struct txgbe *txgbe)
+{
+	txgbe->gpio_irq = irq_find_mapping(txgbe->misc.domain, TXGBE_IRQ_GPIO);
+	return request_threaded_irq(txgbe->gpio_irq, NULL,
+				    txgbe_gpio_irq_handler,
+				    IRQF_ONESHOT, "txgbe-gpio-irq", txgbe);
+}
+
+static int txgbe_request_link_irq(struct txgbe *txgbe)
+{
+	txgbe->link_irq = irq_find_mapping(txgbe->misc.domain, TXGBE_IRQ_LINK);
+	return request_threaded_irq(txgbe->link_irq, NULL,
+				    txgbe_link_irq_handler,
+				    IRQF_ONESHOT, "txgbe-link-irq", txgbe);
+}
+
+static const struct irq_chip txgbe_irq_chip = {
+	.name = "txgbe-misc-irq",
+};
+
+static int txgbe_misc_irq_domain_map(struct irq_domain *d,
+				     unsigned int irq,
+				     irq_hw_number_t hwirq)
+{
+	struct txgbe *txgbe = d->host_data;
+
+	irq_set_chip_data(irq, txgbe);
+	irq_set_chip(irq, &txgbe->misc.chip);
+	irq_set_nested_thread(irq, true);
+	irq_set_noprobe(irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops txgbe_misc_irq_domain_ops = {
+	.map = txgbe_misc_irq_domain_map,
+};
+
+static irqreturn_t txgbe_misc_irq_handle(int irq, void *data)
+{
+	struct txgbe *txgbe = data;
+	struct wx *wx = txgbe->wx;
+	unsigned int nhandled = 0;
+	unsigned int sub_irq;
+	u32 eicr;
+
+	eicr = wx_misc_isb(wx, WX_ISB_MISC);
+	if (eicr & TXGBE_PX_MISC_GPIO) {
+		sub_irq = irq_find_mapping(txgbe->misc.domain, TXGBE_IRQ_GPIO);
+		handle_nested_irq(sub_irq);
+		nhandled++;
+	}
+	if (eicr & (TXGBE_PX_MISC_ETH_LK | TXGBE_PX_MISC_ETH_LKDN |
+		    TXGBE_PX_MISC_ETH_AN)) {
+		sub_irq = irq_find_mapping(txgbe->misc.domain, TXGBE_IRQ_LINK);
+		handle_nested_irq(sub_irq);
+		nhandled++;
+	}
+
+	wx_intr_enable(wx, TXGBE_INTR_MISC);
+	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
+}
+
+static void txgbe_del_irq_domain(struct txgbe *txgbe)
+{
+	int hwirq, virq;
+
+	for (hwirq = 0; hwirq < txgbe->misc.nirqs; hwirq++) {
+		virq = irq_find_mapping(txgbe->misc.domain, hwirq);
+		irq_dispose_mapping(virq);
+	}
+
+	irq_domain_remove(txgbe->misc.domain);
+}
+
+void txgbe_free_misc_irq(struct txgbe *txgbe)
+{
+	free_irq(txgbe->gpio_irq, txgbe);
+	free_irq(txgbe->link_irq, txgbe);
+	free_irq(txgbe->misc.irq, txgbe);
+	txgbe_del_irq_domain(txgbe);
+}
+
+int txgbe_setup_misc_irq(struct txgbe *txgbe)
+{
+	struct wx *wx = txgbe->wx;
+	int hwirq, err;
+
+	txgbe->misc.nirqs = 2;
+	txgbe->misc.domain = irq_domain_add_simple(NULL, txgbe->misc.nirqs, 0,
+						   &txgbe_misc_irq_domain_ops, txgbe);
+	if (!txgbe->misc.domain)
+		return -ENOMEM;
+
+	for (hwirq = 0; hwirq < txgbe->misc.nirqs; hwirq++)
+		irq_create_mapping(txgbe->misc.domain, hwirq);
+
+	txgbe->misc.chip = txgbe_irq_chip;
+	if (wx->pdev->msix_enabled)
+		txgbe->misc.irq = wx->msix_entry->vector;
+	else
+		txgbe->misc.irq = wx->pdev->irq;
+
+	err = request_threaded_irq(txgbe->misc.irq, NULL,
+				   txgbe_misc_irq_handle,
+				   IRQF_ONESHOT,
+				   wx->netdev->name, txgbe);
+	if (err)
+		goto del_misc_irq;
+
+	err = txgbe_request_gpio_irq(txgbe);
+	if (err)
+		goto free_msic_irq;
+
+	err = txgbe_request_link_irq(txgbe);
+	if (err)
+		goto free_gpio_irq;
+
+	return 0;
+
+free_gpio_irq:
+	free_irq(txgbe->gpio_irq, txgbe);
+free_msic_irq:
+	free_irq(txgbe->misc.irq, txgbe);
+del_misc_irq:
+	txgbe_del_irq_domain(txgbe);
+
+	return err;
+}

drivers/net/ethernet/wangxun/txgbe/txgbe_irq.h

@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2015 - 2024 Beijing WangXun Technology Co., Ltd. */
+
+void txgbe_irq_enable(struct wx *wx, bool queues);
+int txgbe_request_irq(struct wx *wx);
+void txgbe_free_misc_irq(struct txgbe *txgbe);
+int txgbe_setup_misc_irq(struct txgbe *txgbe);