diff options
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_init.c')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_init.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 9d3e8affccb..027b797c991 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -4037,6 +4037,34 @@ lpfc_reset_hba(struct lpfc_hba *phba) } /** + * lpfc_sli_sriov_nr_virtfn_get - Get the number of sr-iov virtual functions + * @phba: pointer to lpfc hba data structure. + * + * This function enables the PCI SR-IOV virtual functions to a physical + * function. It invokes the PCI SR-IOV api with the @nr_vfn provided to + * enable the number of virtual functions to the physical function. As + * not all devices support SR-IOV, the return code from the pci_enable_sriov() + * API call does not considered as an error condition for most of the device. + **/ +uint16_t +lpfc_sli_sriov_nr_virtfn_get(struct lpfc_hba *phba) +{ + struct pci_dev *pdev = phba->pcidev; + uint16_t nr_virtfn; + int pos; + + if (!pdev->is_physfn) + return 0; + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); + if (pos == 0) + return 0; + + pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF, &nr_virtfn); + return nr_virtfn; +} + +/** * lpfc_sli_probe_sriov_nr_virtfn - Enable a number of sr-iov virtual functions * @phba: pointer to lpfc hba data structure. * @nr_vfn: number of virtual functions to be enabled. @@ -4051,8 +4079,17 @@ int lpfc_sli_probe_sriov_nr_virtfn(struct lpfc_hba *phba, int nr_vfn) { struct pci_dev *pdev = phba->pcidev; + uint16_t max_nr_vfn; int rc; + max_nr_vfn = lpfc_sli_sriov_nr_virtfn_get(phba); + if (nr_vfn > max_nr_vfn) { + lpfc_printf_log(phba, KERN_ERR, LOG_INIT, + "3057 Requested vfs (%d) greater than " + "supported vfs (%d)", nr_vfn, max_nr_vfn); + return -EINVAL; + } + rc = pci_enable_sriov(pdev, nr_vfn); if (rc) { lpfc_printf_log(phba, KERN_WARNING, LOG_INIT, @@ -9487,6 +9524,13 @@ lpfc_io_slot_reset_s4(struct pci_dev *pdev) } pci_restore_state(pdev); + + /* + * As the new kernel behavior of pci_restore_state() API call clears + * device saved_state flag, need to save the restored state again. + */ + pci_save_state(pdev); + if (pdev->is_busmaster) pci_set_master(pdev); |