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scsi: cxlflash: Support process specific mappings 

Once the context is started, the assigned MMIO space can be mapped and
unmapped. Provide means to map and unmap the context MMIO space.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Uma Krishnan 2018-03-26 11:32:56 -05:00 committed by Martin K. Petersen
parent 6b938ac910
commit 012f394cb8
1 changed files with 24 additions and 0 deletions
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24
drivers/scsi/cxlflash/ocxl_hw.c
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@ -150,6 +150,28 @@ err1:
goto out;
}
/**
* ocxlflash_psa_map() - map the process specific MMIO space
* @ctx_cookie: Adapter context for which the mapping needs to be done.
*
* Return: MMIO pointer of the mapped region
*/
static void __iomem *ocxlflash_psa_map(void *ctx_cookie)
{
struct ocxlflash_context *ctx = ctx_cookie;
return ioremap(ctx->psn_phys, ctx->psn_size);
}
/**
* ocxlflash_psa_unmap() - unmap the process specific MMIO space
* @addr: MMIO pointer to unmap.
*/
static void ocxlflash_psa_unmap(void __iomem *addr)
{
iounmap(addr);
}
/**
* ocxlflash_process_element() - get process element of the adapter context
* @ctx_cookie: Adapter context associated with the process element.
@ -618,6 +640,8 @@ static void *ocxlflash_fops_get_context(struct file *file)
/* Backend ops to ocxlflash services */
const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
.module = THIS_MODULE,
.psa_map = ocxlflash_psa_map,
.psa_unmap = ocxlflash_psa_unmap,
.process_element = ocxlflash_process_element,
.start_context = ocxlflash_start_context,
.set_master = ocxlflash_set_master,