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cxlflash: Virtual LUN support

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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>
This commit is contained in:
Matthew R. Ochs
2015-08-13 21:47:53 -05:00
committed by James Bottomley
parent 65be2c79ac
commit 2cb79266d6
11 changed files with 1550 additions and 17 deletions
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13
drivers/scsi/cxlflash/main.c
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@@ -1989,6 +1989,8 @@ static int init_afu(struct cxlflash_cfg *cfg)
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 @@ static int cxlflash_probe(struct pci_dev *pdev,
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;