Function msix_capability_init

components/drivers/pci/msi/msi.c:791–879

}

static rt_ssize_t msix_capability_init(struct rt_pci_device *pdev,
        struct rt_pci_msix_entry *entries, int nvec,
        RT_IRQ_AFFINITY_DECLARE((*affinities)))
{
    rt_err_t err;
    rt_uint16_t msgctl;
    rt_size_t table_size;
    void *table_base, *table_entry;
    struct rt_pci_msi_desc *desc;
    struct rt_pci_msix_entry *entry;

    /*
     * Some devices require MSI-X to be enabled before the MSI-X
     * registers can be accessed.
     * Mask all the vectors to prevent interrupts coming in before
     * they're fully set up.
     */
    msix_update_ctrl(pdev, 0, PCIM_MSIXCTRL_FUNCTION_MASK | PCIM_MSIXCTRL_MSIX_ENABLE);

    rt_pci_read_config_u16(pdev, pdev->msix_cap + PCIR_MSIX_CTRL, &msgctl);
    /* Request & Map MSI-X table region */
    table_size = rt_pci_msix_table_size(msgctl);
    table_base = msix_table_remap(pdev, table_size);

    if (!table_base)
    {
        LOG_E("%s: Remap MSI-X table fail", rt_dm_dev_get_name(&pdev->parent));

        err = -RT_ENOMEM;
        goto _out_disbale_msix;
    }

    pdev->msix_base = table_base;

    spin_lock(&pdev->msi_lock);

    if (!(err = msix_setup_msi_descs(pdev, table_base, entries, nvec)))
    {
        if (!(err = rt_pci_msi_setup_irqs(pdev, nvec, PCIY_MSIX)))
        {
            /* Check if all MSI entries honor device restrictions */
            err = msi_verify_entries(pdev);
        }
    }

    spin_unlock(&pdev->msi_lock);

    if (err)
    {
        rt_pci_msi_free_irqs(pdev);

        LOG_E("%s: Setup %s interrupts(%d) error = %s",
                rt_dm_dev_get_name(&pdev->parent), "MSI-X", nvec, rt_strerror(err));

        goto _out_disbale_msix;
    }

    entry = entries;