scsi: cxlflash: Remove port configuration assumptions

At present, the cxlflash driver only supports hardware with two FC ports. The
code was initially designed with this assumption and is dependent on having
two FC ports - adding more ports will break logic within the driver.

To mitigate this issue, remove the existing port assumptions and transition
the code to support more than two ports. As a side effect, clarify the
interpretation of the DK_CXLFLASH_ALL_PORTS_ACTIVE flag.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 3f9c8690af0d..04e1a8effa76 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -365,7 +365,6 @@ static int wait_resp(struct afu *afu, struct afu_cmd *cmd)
  */
 static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd)
 {
-	u32 port_sel = scp->device->channel + 1;
 	struct cxlflash_cfg *cfg = shost_priv(scp->device->host);
 	struct afu_cmd *cmd = sc_to_afucz(scp);
 	struct device *dev = &cfg->dev->dev;
@@ -388,7 +387,7 @@ static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd)
 
 	cmd->rcb.ctx_id = afu->ctx_hndl;
 	cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
-	cmd->rcb.port_sel = port_sel;
+	cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel);
 	cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
 	cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID |
 			      SISL_REQ_FLAGS_SUP_UNDERRUN |
@@ -444,7 +443,6 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
 	struct device *dev = &cfg->dev->dev;
 	struct afu_cmd *cmd = sc_to_afucz(scp);
 	struct scatterlist *sg = scsi_sglist(scp);
-	u32 port_sel = scp->device->channel + 1;
 	u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN;
 	ulong lock_flags;
 	int nseg = 0;
@@ -503,7 +501,7 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
 
 	cmd->rcb.ctx_id = afu->ctx_hndl;
 	cmd->rcb.msi = SISL_MSI_RRQ_UPDATED;
-	cmd->rcb.port_sel = port_sel;
+	cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel);
 	cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
 
 	if (scp->sc_data_direction == DMA_TO_DEVICE)
@@ -1558,7 +1556,8 @@ static int init_global(struct cxlflash_cfg *cfg)
 		writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel);
 		num_ports = 0;
 	} else {
-		writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel);
+		writeq_be(PORT_MASK(cfg->num_fc_ports),
+			  &afu->afu_map->global.regs.afu_port_sel);
 		num_ports = cfg->num_fc_ports;
 	}
 
@@ -2190,7 +2189,7 @@ static ssize_t lun_mode_store(struct device *dev,
 		if (afu->internal_lun)
 			shost->max_channel = 0;
 		else
-			shost->max_channel = cfg->num_fc_ports - 1;
+			shost->max_channel = PORTNUM2CHAN(cfg->num_fc_ports);
 
 		afu_reset(cfg);
 		scsi_scan_host(cfg->host);
@@ -2529,7 +2528,7 @@ static int cxlflash_probe(struct pci_dev *pdev,
 
 	host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS;
 	host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET;
-	host->max_channel = NUM_FC_PORTS - 1;
+	host->max_channel = PORTNUM2CHAN(NUM_FC_PORTS);
 	host->unique_id = host->host_no;
 	host->max_cmd_len = CXLFLASH_MAX_CDB_LEN;