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>

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index b39a03d..73b0b10 100644 (file)
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -151,6 +151,28 @@ err1:
 }
 
 /**
+ * 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,