scsi: qla2xxx: Serialize mailbox request

For driver MBX submission, use mbox_busy to serialize request.  For Userspace
MBX submission, use optrom mutex to serialize request.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 127 insertions, 40 deletions

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 4888b999e82f..14c496bab280 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -158,9 +158,17 @@ qla2x00_sysfs_read_nvram(struct file *filp, struct kobject *kobj,
 	if (!capable(CAP_SYS_ADMIN))
 		return 0;
 
+	mutex_lock(&ha->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&ha->optrom_mutex);
+		return -EAGAIN;
+	}
+
 	if (IS_NOCACHE_VPD_TYPE(ha))
 		ha->isp_ops->read_optrom(vha, ha->nvram, ha->flt_region_nvram << 2,
 		    ha->nvram_size);
+	mutex_unlock(&ha->optrom_mutex);
+
 	return memory_read_from_buffer(buf, count, &off, ha->nvram,
 					ha->nvram_size);
 }
@@ -208,10 +216,17 @@ qla2x00_sysfs_write_nvram(struct file *filp, struct kobject *kobj,
 		return -EAGAIN;
 	}
 
+	mutex_lock(&ha->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
+		return -EAGAIN;
+	}
+
 	/* Write NVRAM. */
 	ha->isp_ops->write_nvram(vha, (uint8_t *)buf, ha->nvram_base, count);
 	ha->isp_ops->read_nvram(vha, (uint8_t *)ha->nvram, ha->nvram_base,
-	    count);
+	     count);
+	mutex_unlock(&ha->optrom_mutex);
 
 	ql_dbg(ql_dbg_user, vha, 0x7060,
 	    "Setting ISP_ABORT_NEEDED\n");
@@ -322,6 +337,10 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
 		size = ha->optrom_size - start;
 
 	mutex_lock(&ha->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&ha->optrom_mutex);
+		return -EAGAIN;
+	}
 	switch (val) {
 	case 0:
 		if (ha->optrom_state != QLA_SREADING &&
@@ -499,8 +518,14 @@ qla2x00_sysfs_read_vpd(struct file *filp, struct kobject *kobj,
 		    qla27xx_find_valid_image(vha) == QLA27XX_SECONDARY_IMAGE)
 			faddr = ha->flt_region_vpd_sec << 2;
 
+		mutex_lock(&ha->optrom_mutex);
+		if (qla2x00_chip_is_down(vha)) {
+			mutex_unlock(&ha->optrom_mutex);
+			return -EAGAIN;
+		}
 		ha->isp_ops->read_optrom(vha, ha->vpd, faddr,
 		    ha->vpd_size);
+		mutex_unlock(&ha->optrom_mutex);
 	}
 	return memory_read_from_buffer(buf, count, &off, ha->vpd, ha->vpd_size);
 }
@@ -518,9 +543,6 @@ qla2x00_sysfs_write_vpd(struct file *filp, struct kobject *kobj,
 	if (unlikely(pci_channel_offline(ha->pdev)))
 		return 0;
 
-	if (qla2x00_chip_is_down(vha))
-		return 0;
-
 	if (!capable(CAP_SYS_ADMIN) || off != 0 || count != ha->vpd_size ||
 	    !ha->isp_ops->write_nvram)
 		return 0;
@@ -531,16 +553,25 @@ qla2x00_sysfs_write_vpd(struct file *filp, struct kobject *kobj,
 		return -EAGAIN;
 	}
 
+	mutex_lock(&ha->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&ha->optrom_mutex);
+		return -EAGAIN;
+	}
+
 	/* Write NVRAM. */
 	ha->isp_ops->write_nvram(vha, (uint8_t *)buf, ha->vpd_base, count);
 	ha->isp_ops->read_nvram(vha, (uint8_t *)ha->vpd, ha->vpd_base, count);
 
 	/* Update flash version information for 4Gb & above. */
-	if (!IS_FWI2_CAPABLE(ha))
+	if (!IS_FWI2_CAPABLE(ha)) {
+		mutex_unlock(&ha->optrom_mutex);
 		return -EINVAL;
+	}
 
 	tmp_data = vmalloc(256);
 	if (!tmp_data) {
+		mutex_unlock(&ha->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x706b,
 		    "Unable to allocate memory for VPD information update.\n");
 		return -ENOMEM;
@@ -548,6 +579,8 @@ qla2x00_sysfs_write_vpd(struct file *filp, struct kobject *kobj,
 	ha->isp_ops->get_flash_version(vha, tmp_data);
 	vfree(tmp_data);
 
+	mutex_unlock(&ha->optrom_mutex);
+
 	return count;
 }
 
@@ -573,10 +606,15 @@ qla2x00_sysfs_read_sfp(struct file *filp, struct kobject *kobj,
 	if (!capable(CAP_SYS_ADMIN) || off != 0 || count < SFP_DEV_SIZE)
 		return 0;
 
-	if (qla2x00_chip_is_down(vha))
+	mutex_lock(&vha->hw->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		return 0;
+	}
 
 	rval = qla2x00_read_sfp_dev(vha, buf, count);
+	mutex_unlock(&vha->hw->optrom_mutex);
+
 	if (rval)
 		return -EIO;
 
@@ -785,9 +823,11 @@ qla2x00_sysfs_read_xgmac_stats(struct file *filp, struct kobject *kobj,
 
 	if (unlikely(pci_channel_offline(ha->pdev)))
 		return 0;
-
-	if (qla2x00_chip_is_down(vha))
+	mutex_lock(&vha->hw->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		return 0;
+	}
 
 	if (ha->xgmac_data)
 		goto do_read;
@@ -795,6 +835,7 @@ qla2x00_sysfs_read_xgmac_stats(struct file *filp, struct kobject *kobj,
 	ha->xgmac_data = dma_alloc_coherent(&ha->pdev->dev, XGMAC_DATA_SIZE,
 	    &ha->xgmac_data_dma, GFP_KERNEL);
 	if (!ha->xgmac_data) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x7076,
 		    "Unable to allocate memory for XGMAC read-data.\n");
 		return 0;
@@ -806,6 +847,8 @@ do_read:
 
 	rval = qla2x00_get_xgmac_stats(vha, ha->xgmac_data_dma,
 	    XGMAC_DATA_SIZE, &actual_size);
+
+	mutex_unlock(&vha->hw->optrom_mutex);
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x7077,
 		    "Unable to read XGMAC data (%x).\n", rval);
@@ -842,13 +885,16 @@ qla2x00_sysfs_read_dcbx_tlv(struct file *filp, struct kobject *kobj,
 
 	if (ha->dcbx_tlv)
 		goto do_read;
-
-	if (qla2x00_chip_is_down(vha))
+	mutex_lock(&vha->hw->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		return 0;
+	}
 
 	ha->dcbx_tlv = dma_alloc_coherent(&ha->pdev->dev, DCBX_TLV_DATA_SIZE,
 	    &ha->dcbx_tlv_dma, GFP_KERNEL);
 	if (!ha->dcbx_tlv) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x7078,
 		    "Unable to allocate memory for DCBX TLV read-data.\n");
 		return -ENOMEM;
@@ -859,6 +905,9 @@ do_read:
 
 	rval = qla2x00_get_dcbx_params(vha, ha->dcbx_tlv_dma,
 	    DCBX_TLV_DATA_SIZE);
+
+	mutex_unlock(&vha->hw->optrom_mutex);
+
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x7079,
 		    "Unable to read DCBX TLV (%x).\n", rval);
@@ -1184,15 +1233,17 @@ qla2x00_beacon_store(struct device *dev, struct device_attribute *attr,
 	if (IS_QLA2100(ha) || IS_QLA2200(ha))
 		return -EPERM;
 
+	if (sscanf(buf, "%d", &val) != 1)
+		return -EINVAL;
+
+	mutex_lock(&vha->hw->optrom_mutex);
 	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x707a,
 		    "Abort ISP active -- ignoring beacon request.\n");
 		return -EBUSY;
 	}
 
-	if (sscanf(buf, "%d", &val) != 1)
-		return -EINVAL;
-
 	if (val)
 		rval = ha->isp_ops->beacon_on(vha);
 	else
@@ -1201,6 +1252,8 @@ qla2x00_beacon_store(struct device *dev, struct device_attribute *attr,
 	if (rval != QLA_SUCCESS)
 		count = 0;
 
+	mutex_unlock(&vha->hw->optrom_mutex);
+
 	return count;
 }
 
@@ -1370,18 +1423,24 @@ qla2x00_thermal_temp_show(struct device *dev,
 {
 	scsi_qla_host_t *vha = shost_priv(class_to_shost(dev));
 	uint16_t temp = 0;
+	int rc;
 
+	mutex_lock(&vha->hw->optrom_mutex);
 	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x70dc, "ISP reset active.\n");
 		goto done;
 	}
 
 	if (vha->hw->flags.eeh_busy) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x70dd, "PCI EEH busy.\n");
 		goto done;
 	}
 
-	if (qla2x00_get_thermal_temp(vha, &temp) == QLA_SUCCESS)
+	rc = qla2x00_get_thermal_temp(vha, &temp);
+	mutex_unlock(&vha->hw->optrom_mutex);
+	if (rc == QLA_SUCCESS)
 		return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
 
 done:
@@ -1402,13 +1461,24 @@ qla2x00_fw_state_show(struct device *dev, struct device_attribute *attr,
 		return scnprintf(buf, PAGE_SIZE, "0x%x\n", pstate);
 	}
 
-	if (qla2x00_chip_is_down(vha))
+	mutex_lock(&vha->hw->optrom_mutex);
+	if (qla2x00_chip_is_down(vha)) {
+		mutex_unlock(&vha->hw->optrom_mutex);
 		ql_log(ql_log_warn, vha, 0x707c,
 		    "ISP reset active.\n");
-	else if (!vha->hw->flags.eeh_busy)
-		rval = qla2x00_get_firmware_state(vha, state);
-	if (rval != QLA_SUCCESS)
+		goto out;
+	} else if (vha->hw->flags.eeh_busy) {
+		mutex_unlock(&vha->hw->optrom_mutex);
+		goto out;
+	}
+
+	rval = qla2x00_get_firmware_state(vha, state);
+	mutex_unlock(&vha->hw->optrom_mutex);
+out:
+	if (rval != QLA_SUCCESS) {
 		memset(state, -1, sizeof(state));
+		rval = qla2x00_get_firmware_state(vha, state);
+	}
 
 	return scnprintf(buf, PAGE_SIZE, "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
 	    state[0], state[1], state[2], state[3], state[4], state[5]);
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index c73039916c03..9d5e320fc1bc 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -189,7 +189,7 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 		goto premature_exit;
 	}
 
-	ha->flags.mbox_busy = 1;
+
 	/* Save mailbox command for debug */
 	ha->mcp = mcp;
 
@@ -198,12 +198,13 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 
 	spin_lock_irqsave(&ha->hardware_lock, flags);
 
-	if (ha->flags.purge_mbox || chip_reset != ha->chip_reset) {
+	if (ha->flags.purge_mbox || chip_reset != ha->chip_reset ||
+	    ha->flags.mbox_busy) {
 		rval = QLA_ABORTED;
-		ha->flags.mbox_busy = 0;
 		spin_unlock_irqrestore(&ha->hardware_lock, flags);
 		goto premature_exit;
 	}
+	ha->flags.mbox_busy = 1;
 
 	/* Load mailbox registers. */
 	if (IS_P3P_TYPE(ha))
@@ -254,9 +255,10 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 		if (IS_P3P_TYPE(ha)) {
 			if (RD_REG_DWORD(&reg->isp82.hint) &
 				HINT_MBX_INT_PENDING) {
+				ha->flags.mbox_busy = 0;
 				spin_unlock_irqrestore(&ha->hardware_lock,
 					flags);
-				ha->flags.mbox_busy = 0;
+
 				atomic_dec(&ha->num_pend_mbx_stage2);
 				ql_dbg(ql_dbg_mbx, vha, 0x1010,
 				    "Pending mailbox timeout, exiting.\n");
@@ -274,6 +276,16 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 		atomic_inc(&ha->num_pend_mbx_stage3);
 		if (!wait_for_completion_timeout(&ha->mbx_intr_comp,
 		    mcp->tov * HZ)) {
+			if (chip_reset != ha->chip_reset) {
+				spin_lock_irqsave(&ha->hardware_lock, flags);
+				ha->flags.mbox_busy = 0;
+				spin_unlock_irqrestore(&ha->hardware_lock,
+				    flags);
+				atomic_dec(&ha->num_pend_mbx_stage2);
+				atomic_dec(&ha->num_pend_mbx_stage3);
+				rval = QLA_ABORTED;
+				goto premature_exit;
+			}
 			ql_dbg(ql_dbg_mbx, vha, 0x117a,
 			    "cmd=%x Timeout.\n", command);
 			spin_lock_irqsave(&ha->hardware_lock, flags);
@@ -282,7 +294,9 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 
 		} else if (ha->flags.purge_mbox ||
 		    chip_reset != ha->chip_reset) {
+			spin_lock_irqsave(&ha->hardware_lock, flags);
 			ha->flags.mbox_busy = 0;
+			spin_unlock_irqrestore(&ha->hardware_lock, flags);
 			atomic_dec(&ha->num_pend_mbx_stage2);
 			atomic_dec(&ha->num_pend_mbx_stage3);
 			rval = QLA_ABORTED;
@@ -300,9 +314,9 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 		if (IS_P3P_TYPE(ha)) {
 			if (RD_REG_DWORD(&reg->isp82.hint) &
 				HINT_MBX_INT_PENDING) {
+				ha->flags.mbox_busy = 0;
 				spin_unlock_irqrestore(&ha->hardware_lock,
 					flags);
-				ha->flags.mbox_busy = 0;
 				atomic_dec(&ha->num_pend_mbx_stage2);
 				ql_dbg(ql_dbg_mbx, vha, 0x1012,
 				    "Pending mailbox timeout, exiting.\n");
@@ -320,7 +334,10 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 		while (!ha->flags.mbox_int) {
 			if (ha->flags.purge_mbox ||
 			    chip_reset != ha->chip_reset) {
+				spin_lock_irqsave(&ha->hardware_lock, flags);
 				ha->flags.mbox_busy = 0;
+				spin_unlock_irqrestore(&ha->hardware_lock,
+				    flags);
 				atomic_dec(&ha->num_pend_mbx_stage2);
 				rval = QLA_ABORTED;
 				goto premature_exit;
@@ -363,7 +380,10 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 		clear_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
 
 		if (IS_P3P_TYPE(ha) && ha->flags.isp82xx_fw_hung) {
+			spin_lock_irqsave(&ha->hardware_lock, flags);
 			ha->flags.mbox_busy = 0;
+			spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
 			/* Setting Link-Down error */
 			mcp->mb[0] = MBS_LINK_DOWN_ERROR;
 			ha->mcp = NULL;
@@ -436,7 +456,10 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 				 * then only PCI ERR flag would be set.
 				 * we will do premature exit for above case.
 				 */
+				spin_lock_irqsave(&ha->hardware_lock, flags);
 				ha->flags.mbox_busy = 0;
+				spin_unlock_irqrestore(&ha->hardware_lock,
+				    flags);
 				rval = QLA_FUNCTION_TIMEOUT;
 				goto premature_exit;
 			}
@@ -451,8 +474,9 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
 			rval = QLA_FUNCTION_TIMEOUT;
 		 }
 	}
-
+	spin_lock_irqsave(&ha->hardware_lock, flags);
 	ha->flags.mbox_busy = 0;
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
 	/* Clean up */
 	ha->mcp = NULL;
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 396c8a6d502c..29fbb0aad489 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -1491,27 +1491,14 @@ int qlt_stop_phase1(struct qla_tgt *tgt)
 	struct qla_hw_data *ha = tgt->ha;
 	unsigned long flags;
 
+	mutex_lock(&ha->optrom_mutex);
 	mutex_lock(&qla_tgt_mutex);
-	if (!vha->fc_vport) {
-		struct Scsi_Host *sh = vha->host;
-		struct fc_host_attrs *fc_host = shost_to_fc_host(sh);
-		bool npiv_vports;
-
-		spin_lock_irqsave(sh->host_lock, flags);
-		npiv_vports = (fc_host->npiv_vports_inuse);
-		spin_unlock_irqrestore(sh->host_lock, flags);
-
-		if (npiv_vports) {
-			mutex_unlock(&qla_tgt_mutex);
-			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf021,
-			    "NPIV is in use. Can not stop target\n");
-			return -EPERM;
-		}
-	}
+
 	if (tgt->tgt_stop || tgt->tgt_stopped) {
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04e,
 		    "Already in tgt->tgt_stop or tgt_stopped state\n");
 		mutex_unlock(&qla_tgt_mutex);
+		mutex_unlock(&ha->optrom_mutex);
 		return -EPERM;
 	}
 
@@ -1549,6 +1536,8 @@ int qlt_stop_phase1(struct qla_tgt *tgt)
 
 	/* Wait for sessions to clear out (just in case) */
 	wait_event_timeout(tgt->waitQ, test_tgt_sess_count(tgt), 10*HZ);
+	mutex_unlock(&ha->optrom_mutex);
+
 	return 0;
 }
 EXPORT_SYMBOL(qlt_stop_phase1);
@@ -6595,6 +6584,9 @@ qlt_enable_vha(struct scsi_qla_host *vha)
 	qlt_set_mode(vha);
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
+	mutex_lock(&ha->optrom_mutex);
+	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf021,
+	    "%s.\n", __func__);
 	if (vha->vp_idx) {
 		qla24xx_disable_vp(vha);
 		qla24xx_enable_vp(vha);
@@ -6603,6 +6595,7 @@ qlt_enable_vha(struct scsi_qla_host *vha)
 		qla2xxx_wake_dpc(base_vha);
 		qla2x00_wait_for_hba_online(base_vha);
 	}
+	mutex_unlock(&ha->optrom_mutex);
 }
 EXPORT_SYMBOL(qlt_enable_vha);