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| author | James Smart <James.Smart@Emulex.Com> | 2006-12-02 13:34:56 -0500 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2006-12-03 09:31:04 -0600 |
| commit | 4ff43246e45943200ae3233732adf8708c2faef6 (patch) | |
| tree | 28204d5a11c4ca0de54c36a9e0bca9cfd3317f1c | |
| parent | c7743956f8cb7b496c05d8444050eba908662a14 (diff) | |
| download | linux-stable-4ff43246e45943200ae3233732adf8708c2faef6.tar.gz linux-stable-4ff43246e45943200ae3233732adf8708c2faef6.tar.bz2 linux-stable-4ff43246e45943200ae3233732adf8708c2faef6.zip | |
[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>
| -rw-r--r-- | drivers/scsi/lpfc/lpfc.h | 1 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_attr.c | 11 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_init.c | 10 |
3 files changed, 22 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index e94190e83fc3..1ec9cf0e374a 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -303,6 +303,7 @@ struct lpfc_hba { uint32_t cfg_max_luns; uint32_t cfg_poll; uint32_t cfg_poll_tmo; + uint32_t cfg_use_msi; uint32_t cfg_sg_seg_cnt; uint32_t cfg_sg_dma_buf_size; uint64_t cfg_soft_wwpn; diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 73d3afc72de2..e2ac7ba3d8ad 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -961,6 +961,15 @@ LPFC_ATTR_R(max_luns, 255, 0, 65535, LPFC_ATTR_RW(poll_tmo, 10, 1, 255, "Milliseconds driver will wait between polling FCP ring"); +/* +# lpfc_use_msi: Use MSI (Message Signaled Interrupts) in systems that +# support this feature +# 0 = MSI disabled (default) +# 1 = MSI enabled +# Value range is [0,1]. Default value is 0. +*/ +LPFC_ATTR_R(use_msi, 0, 0, 1, "Use Message Signaled Interrupts, if possible"); + struct class_device_attribute *lpfc_host_attrs[] = { &class_device_attr_info, @@ -999,6 +1008,7 @@ struct class_device_attribute *lpfc_host_attrs[] = { &class_device_attr_issue_reset, &class_device_attr_lpfc_poll, &class_device_attr_lpfc_poll_tmo, + &class_device_attr_lpfc_use_msi, &class_device_attr_lpfc_soft_wwpn, &class_device_attr_lpfc_soft_wwpn_enable, NULL, @@ -1801,6 +1811,7 @@ lpfc_get_cfgparam(struct lpfc_hba *phba) lpfc_discovery_threads_init(phba, lpfc_discovery_threads); lpfc_max_luns_init(phba, lpfc_max_luns); lpfc_poll_tmo_init(phba, lpfc_poll_tmo); + lpfc_use_msi_init(phba, lpfc_use_msi); lpfc_devloss_tmo_init(phba, lpfc_devloss_tmo); lpfc_nodev_tmo_init(phba, lpfc_nodev_tmo); phba->cfg_poll = lpfc_poll; diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 6b0718573ac5..71ee0cd32216 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -1653,6 +1653,14 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid) if (error) goto out_remove_host; + if (phba->cfg_use_msi) { + error = pci_enable_msi(phba->pcidev); + if (error) + lpfc_printf_log(phba, KERN_INFO, LOG_INIT, "%d:0452 " + "Enable MSI failed, continuing with " + "IRQ\n", phba->brd_no); + } + error = request_irq(phba->pcidev->irq, lpfc_intr_handler, IRQF_SHARED, LPFC_DRIVER_NAME, phba); if (error) { @@ -1732,6 +1740,7 @@ out_free_irq: lpfc_stop_timer(phba); phba->work_hba_events = 0; free_irq(phba->pcidev->irq, phba); + pci_disable_msi(phba->pcidev); out_free_sysfs_attr: lpfc_free_sysfs_attr(phba); out_remove_host: @@ -1798,6 +1807,7 @@ lpfc_pci_remove_one(struct pci_dev *pdev) /* Release the irq reservation */ free_irq(phba->pcidev->irq, phba); + pci_disable_msi(phba->pcidev); lpfc_cleanup(phba, 0); lpfc_stop_timer(phba); |