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scsi: cxlflash: Setup function acTag range 

The OCXL specification supports distributing acTags amongst different AFUs and
functions on the link. The platform-specific acTag range for the link is
obtained using the OCXL provider services and then assigned to the host
function based on implementation.

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 11:31:21 -05:00 committed by Martin K. Petersen
parent e9dfceda92
commit 2e222779ae
2 changed files with 18 additions and 0 deletions
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15
drivers/scsi/cxlflash/ocxl_hw.c
View File

@ -42,6 +42,7 @@ static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
{
struct ocxl_fn_config *fcfg = &afu->fcfg;
struct device *dev = &pdev->dev;
u16 base, enabled, supported;
int rc = 0;
/* Read DVSEC config of the function */
@ -59,6 +60,20 @@ static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
dev_warn(dev, "%s: Unexpected AFU index value %d\n",
__func__, fcfg->max_afu_index);
}
rc = ocxl_config_get_actag_info(pdev, &base, &enabled, &supported);
if (unlikely(rc)) {
dev_err(dev, "%s: ocxl_config_get_actag_info failed rc=%d\n",
__func__, rc);
goto out;
}
afu->fn_actag_base = base;
afu->fn_actag_enabled = enabled;
ocxl_config_set_actag(pdev, fcfg->dvsec_function_pos, base, enabled);
dev_dbg(dev, "%s: Function acTag range base=%u enabled=%u\n",
__func__, base, enabled);
out:
return rc;
}

3
drivers/scsi/cxlflash/ocxl_hw.h
View File

@ -19,5 +19,8 @@ struct ocxl_hw_afu {
struct ocxl_fn_config fcfg; /* DVSEC config of the function */
int fn_actag_base; /* Function acTag base */
int fn_actag_enabled; /* Function acTag number enabled */
bool is_present; /* Function has AFUs defined */
};