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  • vfio_enable_intx

    /* enable legacy (INTx) interrupts */
    static int
    vfio_enable_intx(const struct rte_intr_handle *intr_handle) {
            struct vfio_irq_set *irq_set;
            char irq_set_buf[IRQ_SET_BUF_LEN];
            int len, ret;
            int *fd_ptr;
    
            len = sizeof(irq_set_buf);
    
            /* enable INTx */
            irq_set = (struct vfio_irq_set *) irq_set_buf;
            irq_set->argsz = len;
            irq_set->count = 1;
            irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
            irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
            irq_set->start = 0;
            fd_ptr = (int *) &irq_set->data;
            *fd_ptr = intr_handle->fd;
    
            ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
    
            if (ret) {
                    RTE_LOG(ERR, EAL, "Error enabling INTx interrupts for fd %d
    ",
                                                    intr_handle->fd);
                    return -1;
            }
    
            /* unmask INTx after enabling */
            memset(irq_set, 0, len);
            len = sizeof(struct vfio_irq_set);
            irq_set->argsz = len;
            irq_set->count = 1;
            irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
            irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
            irq_set->start = 0;
    
            ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
    
            if (ret) {
                    RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d
    ",
                                                    intr_handle->fd);
                    return -1;
            }
            return 0;
    }
    
    /* disable legacy (INTx) interrupts */
    static int
    vfio_disable_intx(const struct rte_intr_handle *intr_handle) {
            struct vfio_irq_set *irq_set;
            char irq_set_buf[IRQ_SET_BUF_LEN];
            int len, ret;
    
            len = sizeof(struct vfio_irq_set);
    
            /* mask interrupts before disabling */
            irq_set = (struct vfio_irq_set *) irq_set_buf;
            irq_set->argsz = len;
            irq_set->count = 1;
            irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK;
            irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
            irq_set->start = 0;
    
            ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
    
            if (ret) {
                    RTE_LOG(ERR, EAL, "Error masking INTx interrupts for fd %d
    ",
                                                    intr_handle->fd);
                    return -1;
            }
    
            /* disable INTx*/
            memset(irq_set, 0, len);
            irq_set->argsz = len;
            irq_set->count = 0;
            irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
            irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
            irq_set->start = 0;
    
            ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
    
            if (ret) {
                    RTE_LOG(ERR, EAL,
                            "Error disabling INTx interrupts for fd %d
    ", intr_handle->fd);
                    return -1;
            }
            return 0;
    }
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  • 原文地址:https://www.cnblogs.com/dream397/p/13567449.html
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