[SCSI] lpfc 8.1.11 : Add MSI (Message Signalled Interrupts) support
Add MSI (Message Signalled Interrupts) support Actual use must be enabled via the new module parameter "lpfc_use_msi" Defaults to no use Many thanks to Frederic Temporelli who implemented the initial patch. Signed-off-by: Frederic Temporelli <frederic.temporelli@ext.bull.net> Signed-off-by: James Smart <James.Smart@emulex.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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3 changed files with 22 additions and 0 deletions
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@ -303,6 +303,7 @@ struct lpfc_hba {
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uint32_t cfg_max_luns;
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uint32_t cfg_poll;
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uint32_t cfg_poll_tmo;
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uint32_t cfg_use_msi;
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uint32_t cfg_sg_seg_cnt;
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uint32_t cfg_sg_dma_buf_size;
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uint64_t cfg_soft_wwpn;
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@ -961,6 +961,15 @@ LPFC_ATTR_R(max_luns, 255, 0, 65535,
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LPFC_ATTR_RW(poll_tmo, 10, 1, 255,
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"Milliseconds driver will wait between polling FCP ring");
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/*
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# lpfc_use_msi: Use MSI (Message Signaled Interrupts) in systems that
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# support this feature
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# 0 = MSI disabled (default)
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# 1 = MSI enabled
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# Value range is [0,1]. Default value is 0.
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*/
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LPFC_ATTR_R(use_msi, 0, 0, 1, "Use Message Signaled Interrupts, if possible");
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struct class_device_attribute *lpfc_host_attrs[] = {
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&class_device_attr_info,
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@ -999,6 +1008,7 @@ struct class_device_attribute *lpfc_host_attrs[] = {
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&class_device_attr_issue_reset,
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&class_device_attr_lpfc_poll,
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&class_device_attr_lpfc_poll_tmo,
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&class_device_attr_lpfc_use_msi,
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&class_device_attr_lpfc_soft_wwpn,
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&class_device_attr_lpfc_soft_wwpn_enable,
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NULL,
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@ -1801,6 +1811,7 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
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lpfc_discovery_threads_init(phba, lpfc_discovery_threads);
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lpfc_max_luns_init(phba, lpfc_max_luns);
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lpfc_poll_tmo_init(phba, lpfc_poll_tmo);
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lpfc_use_msi_init(phba, lpfc_use_msi);
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lpfc_devloss_tmo_init(phba, lpfc_devloss_tmo);
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lpfc_nodev_tmo_init(phba, lpfc_nodev_tmo);
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phba->cfg_poll = lpfc_poll;
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@ -1653,6 +1653,14 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
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if (error)
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goto out_remove_host;
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if (phba->cfg_use_msi) {
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error = pci_enable_msi(phba->pcidev);
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if (error)
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lpfc_printf_log(phba, KERN_INFO, LOG_INIT, "%d:0452 "
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"Enable MSI failed, continuing with "
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"IRQ\n", phba->brd_no);
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}
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error = request_irq(phba->pcidev->irq, lpfc_intr_handler, IRQF_SHARED,
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LPFC_DRIVER_NAME, phba);
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if (error) {
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@ -1732,6 +1740,7 @@ out_free_irq:
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lpfc_stop_timer(phba);
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phba->work_hba_events = 0;
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free_irq(phba->pcidev->irq, phba);
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pci_disable_msi(phba->pcidev);
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out_free_sysfs_attr:
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lpfc_free_sysfs_attr(phba);
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out_remove_host:
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@ -1798,6 +1807,7 @@ lpfc_pci_remove_one(struct pci_dev *pdev)
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/* Release the irq reservation */
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free_irq(phba->pcidev->irq, phba);
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pci_disable_msi(phba->pcidev);
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lpfc_cleanup(phba, 0);
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lpfc_stop_timer(phba);
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