scsi: lpfc: add support to retrieve firmware logs

This patch adds the ability to read firmware logs from the adapter. The driver
registers a buffer with the adapter that is then written to by the adapter.
The adapter posts CQEs to indicate content updates in the buffer. While the
adapter is writing to the buffer in a circular fashion, an application will
poll the driver to read the next amount of log data from the buffer.

Driver log buffer size is configurable via the ras_fwlog_buffsize sysfs
attribute. Verbosity to be used by firmware when logging to host memory is
controlled through the ras_fwlog_level attribute.  The ras_fwlog_func
attribute enables or disables loggy by firmware.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index bb2bff7b56b4..054072cbfa3c 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -6228,6 +6228,9 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
 	if (phba->cfg_fof)
 		fof_vectors = 1;
 
+	/* Verify RAS support on adapter */
+	lpfc_sli4_ras_init(phba);
+
 	/* Verify all the SLI4 queues */
 	rc = lpfc_sli4_queue_verify(phba);
 	if (rc)
@@ -10515,6 +10518,14 @@ lpfc_sli4_hba_unset(struct lpfc_hba *phba)
 	/* Stop kthread signal shall trigger work_done one more time */
 	kthread_stop(phba->worker_thread);
 
+	/* Disable FW logging to host memory */
+	writel(LPFC_CTL_PDEV_CTL_DDL_RAS,
+	       phba->sli4_hba.conf_regs_memmap_p + LPFC_CTL_PDEV_CTL_OFFSET);
+
+	/* Free RAS DMA memory */
+	if (phba->ras_fwlog.ras_enabled == true)
+		lpfc_sli4_ras_dma_free(phba);
+
 	/* Unset the queues shared with the hardware then release all
 	 * allocated resources.
 	 */
@@ -10760,6 +10771,7 @@ lpfc_get_sli4_parameters(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
 		phba->mds_diags_support = 1;
 	else
 		phba->mds_diags_support = 0;
+
 	return 0;
 }
 
@@ -11721,6 +11733,10 @@ lpfc_pci_probe_one_s4(struct pci_dev *pdev, const struct pci_device_id *pid)
 
 	/* Check if there are static vports to be created. */
 	lpfc_create_static_vport(phba);
+
+	/* Enable RAS FW log support */
+	lpfc_sli4_ras_setup(phba);
+
 	return 0;
 
 out_disable_intr:
@@ -12451,6 +12467,30 @@ lpfc_sli4_oas_verify(struct lpfc_hba *phba)
 }
 
 /**
+ * lpfc_sli4_ras_init - Verify RAS-FW log is supported by this adapter
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine checks to see if RAS is supported by the adapter. Check the
+ * function through which RAS support enablement is to be done.
+ **/
+void
+lpfc_sli4_ras_init(struct lpfc_hba *phba)
+{
+	switch (phba->pcidev->device) {
+	case PCI_DEVICE_ID_LANCER_G6_FC:
+	case PCI_DEVICE_ID_LANCER_G7_FC:
+		phba->ras_fwlog.ras_hwsupport = true;
+		if (phba->cfg_ras_fwlog_func == PCI_FUNC(phba->pcidev->devfn))
+			phba->ras_fwlog.ras_enabled = true;
+		else
+			phba->ras_fwlog.ras_enabled = false;
+		break;
+	default:
+		phba->ras_fwlog.ras_hwsupport = false;
+	}
+}
+
+/**
  * lpfc_fof_queue_setup - Set up all the fof queues
  * @phba: pointer to lpfc hba data structure.
  *