[SCSI] lpfc 8.2.8 : Add MSI-X support
Add support for MSI-X Multi-Message interrupts. We use different vectors
for fast-path interrupts (i/o) and slow-patch interrupts (discovery, etc).
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/lpfc/lpfc_mbox.c b/drivers/scsi/lpfc/lpfc_mbox.c
index ca35835..65bc8e1 100644
--- a/drivers/scsi/lpfc/lpfc_mbox.c
+++ b/drivers/scsi/lpfc/lpfc_mbox.c
@@ -1,7 +1,7 @@
/*******************************************************************
* This file is part of the Emulex Linux Device Driver for *
* Fibre Channel Host Bus Adapters. *
- * Copyright (C) 2004-2007 Emulex. All rights reserved. *
+ * Copyright (C) 2004-2008 Emulex. All rights reserved. *
* EMULEX and SLI are trademarks of Emulex. *
* www.emulex.com *
* Portions Copyright (C) 2004-2005 Christoph Hellwig *
@@ -272,6 +272,84 @@
}
/**
+ * lpfc_config_msi: Prepare a mailbox command for configuring msi-x.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The configure MSI-X mailbox command is used to configure the HBA's SLI-3
+ * MSI-X multi-message interrupt vector association to interrupt attention
+ * conditions.
+ *
+ * Return codes
+ * 0 - Success
+ * -EINVAL - Failure
+ **/
+int
+lpfc_config_msi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
+{
+ MAILBOX_t *mb = &pmb->mb;
+ uint32_t attentionConditions[2];
+
+ /* Sanity check */
+ if (phba->cfg_use_msi != 2) {
+ lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+ "0475 Not configured for supporting MSI-X "
+ "cfg_use_msi: 0x%x\n", phba->cfg_use_msi);
+ return -EINVAL;
+ }
+
+ if (phba->sli_rev < 3) {
+ lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+ "0476 HBA not supporting SLI-3 or later "
+ "SLI Revision: 0x%x\n", phba->sli_rev);
+ return -EINVAL;
+ }
+
+ /* Clear mailbox command fields */
+ memset(pmb, 0, sizeof(LPFC_MBOXQ_t));
+
+ /*
+ * SLI-3, Message Signaled Interrupt Fearure.
+ */
+
+ /* Multi-message attention configuration */
+ attentionConditions[0] = (HA_R0ATT | HA_R1ATT | HA_R2ATT | HA_ERATT |
+ HA_LATT | HA_MBATT);
+ attentionConditions[1] = 0;
+
+ mb->un.varCfgMSI.attentionConditions[0] = attentionConditions[0];
+ mb->un.varCfgMSI.attentionConditions[1] = attentionConditions[1];
+
+ /*
+ * Set up message number to HA bit association
+ */
+#ifdef __BIG_ENDIAN_BITFIELD
+ /* RA0 (FCP Ring) */
+ mb->un.varCfgMSI.messageNumberByHA[HA_R0_POS] = 1;
+ /* RA1 (Other Protocol Extra Ring) */
+ mb->un.varCfgMSI.messageNumberByHA[HA_R1_POS] = 1;
+#else /* __LITTLE_ENDIAN_BITFIELD */
+ /* RA0 (FCP Ring) */
+ mb->un.varCfgMSI.messageNumberByHA[HA_R0_POS^3] = 1;
+ /* RA1 (Other Protocol Extra Ring) */
+ mb->un.varCfgMSI.messageNumberByHA[HA_R1_POS^3] = 1;
+#endif
+ /* Multi-message interrupt autoclear configuration*/
+ mb->un.varCfgMSI.autoClearHA[0] = attentionConditions[0];
+ mb->un.varCfgMSI.autoClearHA[1] = attentionConditions[1];
+
+ /* For now, HBA autoclear does not work reliably, disable it */
+ mb->un.varCfgMSI.autoClearHA[0] = 0;
+ mb->un.varCfgMSI.autoClearHA[1] = 0;
+
+ /* Set command and owner bit */
+ mb->mbxCommand = MBX_CONFIG_MSI;
+ mb->mbxOwner = OWN_HOST;
+
+ return 0;
+}
+
+/**
* lpfc_init_link: Prepare a mailbox command for initialize link on a HBA.
* @phba: pointer to lpfc hba data structure.
* @pmb: pointer to the driver internal queue element for mailbox command.