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scsi: cxlflash: Setup AFU acTag range 

The OCXL specification supports distributing acTags amongst different AFUs and
functions on the link. As cxlflash devices are expected to only support a
single AFU per function, the entire range that was assigned to the function is
also assigned to the AFU.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Uma Krishnan 2018-03-26 11:31:36 -05:00 committed by Martin K. Petersen
parent 9cc84291be
commit d926519e8f
2 changed files with 15 additions and 0 deletions
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13
drivers/scsi/cxlflash/ocxl_hw.c
View File

@ -92,6 +92,9 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
struct ocxl_afu_config *acfg = &afu->acfg;
struct ocxl_fn_config *fcfg = &afu->fcfg;
struct device *dev = &pdev->dev;
int count;
int base;
int pos;
int rc = 0;
/* This HW AFU function does not have any AFUs defined */
@ -105,6 +108,16 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
__func__, rc);
goto out;
}
/* Only one AFU per function is supported, so actag_base is same */
base = afu->fn_actag_base;
count = min_t(int, acfg->actag_supported, afu->fn_actag_enabled);
pos = acfg->dvsec_afu_control_pos;
ocxl_config_set_afu_actag(pdev, pos, base, count);
dev_dbg(dev, "%s: acTag base=%d enabled=%d\n", __func__, base, count);
afu->afu_actag_base = base;
afu->afu_actag_enabled = count;
out:
return rc;
}

2
drivers/scsi/cxlflash/ocxl_hw.h
View File

@ -22,6 +22,8 @@ struct ocxl_hw_afu {
int fn_actag_base; /* Function acTag base */
int fn_actag_enabled; /* Function acTag number enabled */
int afu_actag_base; /* AFU acTag base */
int afu_actag_enabled; /* AFU acTag number enabled */
bool is_present; /* Function has AFUs defined */
};