cxlflash: Virtual LUN support
Add support for physical LUN segmentation (virtual LUNs) to device
driver supporting the IBM CXL Flash adapter. This patch allows user
space applications to virtually segment a physical LUN into N virtual
LUNs, taking advantage of the translation features provided by this
adapter.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 02d464f..458ed83 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -1989,6 +1989,8 @@
afu_err_intr_init(cfg->afu);
atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room));
+ /* Restore the LUN mappings */
+ cxlflash_restore_luntable(cfg);
err1:
pr_debug("%s: returning rc=%d\n", __func__, rc);
return rc;
@@ -2286,6 +2288,17 @@
cfg->init_state = INIT_STATE_NONE;
cfg->dev = pdev;
+
+ /*
+ * The promoted LUNs move to the top of the LUN table. The rest stay
+ * on the bottom half. The bottom half grows from the end
+ * (index = 255), whereas the top half grows from the beginning
+ * (index = 0).
+ */
+ cfg->promote_lun_index = 0;
+ cfg->last_lun_index[0] = CXLFLASH_NUM_VLUNS/2 - 1;
+ cfg->last_lun_index[1] = CXLFLASH_NUM_VLUNS/2 - 1;
+
cfg->dev_id = (struct pci_device_id *)dev_id;
cfg->mcctx = NULL;