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[v2,18/38] cxlflash: Support process specific mappings

Message ID 1519683756-17402-1-git-send-email-ukrishn@linux.vnet.ibm.com (mailing list archive)
State Changes Requested
Headers show

Commit Message

Uma Krishnan Feb. 26, 2018, 10:22 p.m. UTC 
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>
---
 drivers/scsi/cxlflash/ocxl_hw.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
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Patch

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index f1c55ce..67f0252 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -151,6 +151,28 @@  static struct file *ocxlflash_getfile(struct device *dev, const char *name,
 }
 
 /**
+ * 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.
  *
@@ -610,6 +632,8 @@  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,