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Message-Id: <200610051107.59678.misha@fabric7.com>
Date: Thu, 5 Oct 2006 11:07:59 -0700
From: Misha Tomushev <misha@...ric7.com>
To: Jeff Garzik <jeff@...zik.org>
Cc: KERNEL Linux <linux-kernel@...r.kernel.org>,
NETDEV Linux <linux-kernel@...r.kernel.org>
Subject: [PATCH 7/10] VIOC: New Network Device Driver
Adding VIOC device driver. Interrupt handler.
Signed-off-by: Misha Tomushev <misha@...ric7.com>
diff -uprN linux-2.6.17/drivers/net/vioc/vioc_irq.c
linux-2.6.17.vioc/drivers/net/vioc/vioc_irq.c
--- linux-2.6.17/drivers/net/vioc/vioc_irq.c 1969-12-31 16:00:00.000000000
-0800
+++ linux-2.6.17.vioc/drivers/net/vioc/vioc_irq.c 2006-10-04
10:37:56.000000000 -0700
@@ -0,0 +1,538 @@
+/*
+ * Fabric7 Systems Virtual IO Controller Driver
+ * Copyright (C) 2003-2005 Fabric7 Systems. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ * http://www.fabric7.com/
+ *
+ * Maintainers:
+ * driver-support@...ric7.com
+ *
+ *
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/if_vlan.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+#include <asm/apic.h>
+
+#include "f7/vnic_hw_registers.h"
+#include "f7/vnic_defs.h"
+#include "vioc_vnic.h"
+
+#define VIOC_INTERRUPTS_CNT 19 /* 16 Rx + 1 Tx + 1 BMC + 1 Error */
+#define VIOC_INTERRUPTS_CNT_PIN_IRQ 4 /* 2 Rx + 1 Tx + 1 BMC */
+
+#define VIOC_SLVAR(x) x spinlock_t vioc_driver_lock = SPIN_LOCK_UNLOCKED
+#define VIOC_CLI spin_lock_irq(&vioc_driver_lock)
+#define VIOC_STI spin_unlock_irq(&vioc_driver_lock)
+#define IRQRETURN return IRQ_HANDLED
+#define TX_IRQ_IDX 16
+#define BMC_IRQ_IDX 17
+#define ERR_IRQ_IDX 18
+#define HANDLER_TASKLET 1
+#define HANDLER_DIRECT 2
+#define HANDLER_TASKQ 3
+#define VIOC_RX0_PCI_FUNC 0
+#define VIOC_TX_PCI_FUNC 1
+#define VIOC_BMC_PCI_FUNC 2
+#define VIOC_RX1_PCI_FUNC 3
+#define VIOC_IRQ_NONE (u16) -1
+#define VIOC_ID_NONE -1
+#define VIOC_IVEC_NONE -1
+#define VIOC_INTR_NONE -1
+
+
+struct vioc_msix_entry {
+ u16 vector;
+ u16 entry;
+};
+
+struct vioc_intreq {
+ char name[VIOC_NAME_LEN];
+ void (*intrFuncp) (void *);
+ void *intrFuncparm;
+ irqreturn_t(*hthandler) (int, void *, struct pt_regs *);
+ unsigned int irq;
+ unsigned int vec;
+ unsigned int intr_base;
+ unsigned int intr_offset;
+ unsigned int timeout_value;
+ unsigned int pkt_counter;
+ unsigned int rxc_mask;
+ struct work_struct taskq;
+ struct tasklet_struct tasklet;
+};
+
+struct viocdev_intreq {
+ int vioc_id;
+ struct pci_dev *pci_dev;
+ void *vioc_virt;
+ unsigned long long vioc_phy;
+ void *ioapic_virt;
+ unsigned long long ioapic_phy;
+ struct vioc_intreq intreq[VIOC_INTERRUPTS_CNT];
+ struct vioc_msix_entry irqs[VIOC_INTERRUPTS_CNT];
+};
+
+/* GLOBAL VIOC Interrupt table/structure */
+struct viocdev_intreq vioc_interrupts[VIOC_MAX_VIOCS];
+
+VIOC_SLVAR();
+
+static irqreturn_t taskq_handler(int i, void *p, struct pt_regs *r)
+{
+ int intr_id = VIOC_IRQ_PARAM_INTR_ID(p);
+ int vioc_id = VIOC_IRQ_PARAM_VIOC_ID(p);
+
+ schedule_work(&vioc_interrupts[vioc_id].intreq[intr_id].taskq);
+ IRQRETURN;
+}
+
+static irqreturn_t tasklet_handler(int i, void *p, struct pt_regs *r)
+{
+ int intr_id = VIOC_IRQ_PARAM_INTR_ID(p);
+ int vioc_id = VIOC_IRQ_PARAM_VIOC_ID(p);
+
+ tasklet_schedule(&vioc_interrupts[vioc_id].intreq[intr_id].tasklet);
+ IRQRETURN;
+}
+
+static irqreturn_t direct_handler(int i, void *p, struct pt_regs *r)
+{
+ int intr_id = VIOC_IRQ_PARAM_INTR_ID(p);
+ int vioc_id = VIOC_IRQ_PARAM_VIOC_ID(p);
+
+ vioc_interrupts[vioc_id].intreq[intr_id].
+ intrFuncp(vioc_interrupts[vioc_id].intreq[intr_id].intrFuncparm);
+ IRQRETURN;
+}
+
+static int vioc_enable_msix(u32 viocdev_idx)
+{
+ struct vioc_device *viocdev = vioc_viocdev(viocdev_idx);
+ int ret;
+
+#if defined(CONFIG_MSIX_MOD)
+ ret = pci_enable_msix(viocdev->pdev,
+ (struct msix_entry *)
+ &vioc_interrupts[viocdev_idx].irqs,
+ VIOC_INTERRUPTS_CNT);
+ if (ret == 0) {
+ dev_err(&viocdev->pdev->dev, "MSI-X OK\n");
+ return VIOC_INTERRUPTS_CNT;
+ } else {
+ dev_err(&viocdev->pdev->dev,
+ "Enabling MSIX failed (%d) VIOC %d, use PIN-IRQ\n", ret,
+ viocdev_idx);
+ pci_disable_msix(viocdev->pdev);
+ ret = pci_request_regions(viocdev->pdev, VIOC_DRV_MODULE_NAME);
+ if (ret != 0) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: Cannot obtain PCI resources\n",
+ viocdev_idx);
+ return 0;
+ }
+ return VIOC_INTERRUPTS_CNT_PIN_IRQ;
+ }
+#else
+ ret = pci_request_regions(viocdev->pdev, VIOC_DRV_MODULE_NAME);
+ if (ret != 0) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: Cannot obtain PCI resources\n",
+ viocdev_idx);
+ return 0;
+ }
+ return VIOC_INTERRUPTS_CNT_PIN_IRQ;
+#endif
+}
+
+static void vioc_irq_remove(int viocdev_idx, int irq)
+{
+ int intr_id;
+
+ if (viocdev_idx >= VIOC_MAX_VIOCS)
+ return;
+
+ for (intr_id = 0; intr_id < VIOC_INTERRUPTS_CNT; intr_id++) {
+ if (vioc_interrupts[viocdev_idx].intreq[intr_id].irq == irq) {
+ if (vioc_interrupts[viocdev_idx].intreq[intr_id].irq !=
+ VIOC_IRQ_NONE) {
+ free_irq(vioc_interrupts[viocdev_idx].
+ intreq[intr_id].irq,
+ vioc_interrupts[viocdev_idx].
+ intreq[intr_id].intrFuncparm);
+ }
+ vioc_interrupts[viocdev_idx].intreq[intr_id].irq =
+ VIOC_IRQ_NONE;
+ vioc_interrupts[viocdev_idx].irqs[intr_id].vector =
+ VIOC_IRQ_NONE;
+ }
+ }
+}
+
+void vioc_free_irqs(u32 viocdev_idx)
+{
+ u32 i;
+
+ for (i = 0; i < VIOC_INTERRUPTS_CNT; i++) {
+ if (vioc_interrupts[viocdev_idx].irqs[i].vector !=
+ VIOC_IRQ_NONE) {
+ vioc_irq_remove(viocdev_idx,
+ vioc_interrupts[viocdev_idx].irqs[i].
+ vector);
+ }
+ }
+}
+
+void vioc_irq_exit(void)
+{
+ int vioc_id;
+
+ for (vioc_id = 0; vioc_id < VIOC_MAX_VIOCS; vioc_id++)
+ vioc_free_irqs(vioc_id);
+}
+
+int vioc_irq_init(void)
+{
+ int intr_id, vioc_id;
+
+ /* Zero out whole vioc_interrupts array */
+ memset(&vioc_interrupts, 0, sizeof(vioc_interrupts));
+
+ for (vioc_id = 0; vioc_id < VIOC_MAX_VIOCS; vioc_id++) {
+ vioc_interrupts[vioc_id].vioc_id = VIOC_ID_NONE;
+ for (intr_id = 0; intr_id < VIOC_INTERRUPTS_CNT; intr_id++) {
+ vioc_interrupts[vioc_id].intreq[intr_id].irq =
+ VIOC_IRQ_NONE;
+ vioc_interrupts[vioc_id].irqs[intr_id].vector =
+ VIOC_IRQ_NONE;
+ vioc_interrupts[vioc_id].irqs[intr_id].entry = intr_id;
+ }
+ }
+ return 0;
+}
+
+int get_pci_pin_irq(struct pci_dev *dev_in, int func)
+{
+ struct pci_dev *dev = NULL;
+ unsigned int slot, fn, devfn;
+
+ slot = PCI_SLOT(dev_in->devfn);
+ fn = PCI_FUNC(dev_in->devfn);
+ devfn = dev_in->devfn;
+
+ devfn = PCI_DEVFN(slot, func);
+ /* Find pci_dev structure of the requested function */
+ dev = pci_find_slot(dev_in->bus->number, devfn);
+ if (dev) {
+ return dev->irq;
+ } else {
+ return VIOC_IRQ_NONE;
+ }
+}
+
+static int vioc_irq_install(struct pci_dev *vioc_pci_dev,
+ void (*routine) (void *),
+ int vioc_id,
+ int intr_id,
+ int irq,
+ int intr_handler_type,
+ int intr_param, char *intr_name)
+{
+ int ret;
+ void *intr_func_param = (void *)
+ VIOC_IRQ_PARAM_SET(vioc_id, intr_id, intr_param);
+
+ /*
+ * Find IRQ of requested interrupt: For now, search the
+ * vioc_interrupts[] table that was initialized with proper
+ * IRQs during viocdev_htirq_init() In the final product, the
+ * IRQ will be obtained from the pci_dev structure of the VIOC
+ * device.
+ */
+
+ if (vioc_id >= VIOC_MAX_VIOCS)
+ return -ENODEV;
+
+ if (intr_id >= VIOC_INTERRUPTS_CNT) {
+ dev_err(&vioc_pci_dev->dev,
+ "%s: INTR ID (%d) out of range for Interrupt IRQ %d, name %s\n",
+ __FUNCTION__, intr_id, irq, intr_name);
+ return -EINVAL;
+ }
+ vioc_interrupts[vioc_id].vioc_id = vioc_id;
+
+ if (vioc_interrupts[vioc_id].intreq[intr_id].irq != VIOC_IRQ_NONE) {
+ free_irq(vioc_interrupts[vioc_id].
+ intreq[intr_id].irq,
+ vioc_interrupts[vioc_id].intreq[intr_id].intrFuncparm);
+ vioc_interrupts[vioc_id].intreq[intr_id].irq = VIOC_IRQ_NONE;
+ }
+
+ vioc_set_intr_func_param(vioc_id, intr_id, intr_param);
+ INIT_WORK(&vioc_interrupts[vioc_id].intreq[intr_id].taskq, routine,
+ intr_func_param);
+
+ vioc_interrupts[vioc_id].intreq[intr_id].irq = irq;
+ vioc_interrupts[vioc_id].intreq[intr_id].name[VIOC_NAME_LEN - 1] = '\0';
+
+ vioc_interrupts[vioc_id].intreq[intr_id].timeout_value = 100;
+ vioc_interrupts[vioc_id].intreq[intr_id].pkt_counter = 1;
+ vioc_interrupts[vioc_id].intreq[intr_id].vec = VIOC_IVEC_NONE;
+ vioc_interrupts[vioc_id].intreq[intr_id].intrFuncp = routine;
+
+ /* Init work_struct used to schedule task from INTR handler code */
+
+ /* Init tasklet_struct used to run "tasklet" from INTR handler code */
+ vioc_interrupts[vioc_id].intreq[intr_id].tasklet.next = NULL;
+ vioc_interrupts[vioc_id].intreq[intr_id].tasklet.state = 0;
+ atomic_set(&vioc_interrupts[vioc_id].intreq[intr_id].tasklet.count, 0);
+ vioc_interrupts[vioc_id].intreq[intr_id].tasklet.func =
+ (void (*)(unsigned long))routine;
+
+ snprintf(&vioc_interrupts[vioc_id].intreq[intr_id].name[0],
+ VIOC_NAME_LEN, "%s_%02x", intr_name, vioc_id);
+ vioc_interrupts[vioc_id].intreq[intr_id].name[VIOC_NAME_LEN - 1] = '\0';
+
+ if (intr_handler_type == HANDLER_TASKLET)
+ vioc_interrupts[vioc_id].intreq[intr_id].hthandler =
+ tasklet_handler;
+ else if (intr_handler_type == HANDLER_TASKQ)
+ vioc_interrupts[vioc_id].intreq[intr_id].hthandler =
+ taskq_handler;
+ else if (intr_handler_type == HANDLER_DIRECT)
+ vioc_interrupts[vioc_id].intreq[intr_id].hthandler =
+ direct_handler;
+ else {
+ dev_err(&vioc_pci_dev->dev,
+ "%s: Interrupt handler type for name %s unknown\n",
+ __FUNCTION__, intr_name);
+ return -EINVAL;
+ }
+
+ ret = request_irq(vioc_interrupts[vioc_id].intreq[intr_id].irq,
+ vioc_interrupts[vioc_id].intreq[intr_id].hthandler,
+ SA_INTERRUPT,
+ vioc_interrupts[vioc_id].intreq[intr_id].name,
+ vioc_interrupts[vioc_id].intreq[intr_id].
+ intrFuncparm);
+ if (ret) {
+ dev_err(&vioc_pci_dev->dev, "%s: request_irq() -> %d\n", __FUNCTION__,
ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+int vioc_set_intr_func_param(int viocdev_idx, int intr_idx, int intr_param)
+{
+ struct vioc_device *viocdev = vioc_viocdev(viocdev_idx);
+
+ void *intr_func_param = (void *)
+ VIOC_IRQ_PARAM_SET(viocdev_idx, intr_idx, intr_param);
+
+ if (viocdev_idx >= VIOC_MAX_VIOCS) {
+ dev_err(&viocdev->pdev->dev, "%s: VIOC ID (%d) is out of range\n",
+ __FUNCTION__, viocdev_idx);
+ return -ENODEV;
+ }
+
+ if (intr_idx >= VIOC_INTERRUPTS_CNT) {
+ dev_err(&viocdev->pdev->dev, "%s: INTR ID (%d) is out of range\n",
+ __FUNCTION__, intr_idx);
+ return -EINVAL;
+ }
+
+ vioc_interrupts[viocdev_idx].intreq[intr_idx].intrFuncparm =
+ intr_func_param;
+ vioc_interrupts[viocdev_idx].intreq[intr_idx].taskq.data =
+ intr_func_param;
+ vioc_interrupts[viocdev_idx].intreq[intr_idx].tasklet.data =
+ (unsigned long)intr_func_param;
+ return 0;
+}
+
+/*
+ * Function returns number of Rx IRQs.
+ * When PIN IRQ is used, 2 Rx IRQs are supported.
+ * With MSI-X 16 Rx IRQs.
+ */
+
+int vioc_request_irqs(u32 viocdev_idx)
+{
+ struct vioc_device *viocdev = vioc_viocdev(viocdev_idx);
+ int ret;
+ int total_num_irqs;
+ int intr_idx;
+ char name_buf[64];
+
+ /* Check for MSI-X, install either 2 or 16 Rx IRQs */
+ total_num_irqs = vioc_enable_msix(viocdev_idx);
+ viocdev->num_irqs = total_num_irqs;
+
+ switch (total_num_irqs) {
+
+ case VIOC_INTERRUPTS_CNT_PIN_IRQ:
+ vioc_interrupts[viocdev_idx].irqs[2].vector =
+ get_pci_pin_irq(viocdev->pdev, VIOC_TX_PCI_FUNC);
+ vioc_interrupts[viocdev_idx].irqs[3].vector =
+ get_pci_pin_irq(viocdev->pdev, VIOC_BMC_PCI_FUNC);
+
+ intr_idx = 0;
+ vioc_interrupts[viocdev_idx].irqs[intr_idx].vector =
+ get_pci_pin_irq(viocdev->pdev, VIOC_RX0_PCI_FUNC);
+ sprintf(name_buf, "rx%02d_intr", intr_idx);
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_rxc_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector, HANDLER_DIRECT,
+ intr_idx, name_buf);
+ if (ret) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: RX IRQ %02d not installed\n",
+ viocdev_idx, intr_idx);
+ return 0;
+ }
+
+ intr_idx = 1;
+ vioc_interrupts[viocdev_idx].irqs[intr_idx].vector =
+ get_pci_pin_irq(viocdev->pdev, VIOC_RX1_PCI_FUNC);
+ sprintf(name_buf, "rx%02d_intr", intr_idx);
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_rxc_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector, HANDLER_DIRECT,
+ intr_idx, name_buf);
+ if (ret) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: RX IRQ %02d not installed\n",
+ viocdev_idx, intr_idx);
+ return 0;
+ }
+
+ intr_idx = TX_IRQ_IDX;
+ vioc_interrupts[viocdev_idx].irqs[intr_idx].vector =
+ get_pci_pin_irq(viocdev->pdev, VIOC_TX_PCI_FUNC);
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_tx_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector, HANDLER_TASKLET,
+ intr_idx, "tx_intr");
+ if (ret) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: TX IRQ not installed\n",
+ viocdev_idx);
+ return 0;
+ }
+
+ intr_idx = BMC_IRQ_IDX;
+ vioc_interrupts[viocdev_idx].irqs[intr_idx].vector =
+ get_pci_pin_irq(viocdev->pdev, VIOC_BMC_PCI_FUNC);
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_bmc_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector, HANDLER_TASKQ,
+ intr_idx, "bmc_intr");
+ if (ret) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: BMC IRQ not installed\n",
+ viocdev_idx);
+ return 0;
+ }
+
+ return 2;
+
+ case VIOC_INTERRUPTS_CNT:
+
+ for (intr_idx = 0; intr_idx < 16; intr_idx++) {
+ sprintf(name_buf, "rx%02d_intr", intr_idx);
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_rxc_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector,
+ HANDLER_DIRECT, intr_idx,
+ name_buf);
+ if (ret) {
+ dev_err(&viocdev->pdev->dev,
+ "vioc%d: RX IRQ %02d not installed\n",
+ viocdev_idx, intr_idx);
+ return 0;
+ }
+ }
+
+ intr_idx = TX_IRQ_IDX;
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_tx_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector, HANDLER_TASKLET,
+ intr_idx, "tx_intr");
+ if (ret) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: TX IRQ not installed\n",
+ viocdev_idx);
+ return 0;
+ }
+
+ intr_idx = BMC_IRQ_IDX;
+ ret = vioc_irq_install(viocdev->pdev,
+ vioc_bmc_interrupt,
+ viocdev_idx,
+ intr_idx,
+ vioc_interrupts[viocdev_idx].
+ irqs[intr_idx].vector, HANDLER_TASKQ,
+ intr_idx, "bmc_intr");
+ if (ret) {
+ dev_err(&viocdev->pdev->dev, "vioc%d: BMC IRQ not installed\n",
+ viocdev_idx);
+ return 0;
+ }
+
+ return 16;
+
+ default:
+
+ return 0;
+ }
+
+ return 0;
+}
+
--
Misha Tomushev
misha@...ric7.com
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