[PATCH v2 2/4] cxl/region: Add region reference in memdev attach

[<alucerop@amd.com>]

From: Alejandro Lucero <alucerop@amd.com>

Use a new field in cxl_attach_region struct for easily link it with the
region the memdev is attached to.

This facilitates device links creation where such a region is the supplier
with non-PF0 physical functions wanting to use the CXL region being the
consumers.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
---
 drivers/cxl/core/region.c | 1 +
 drivers/cxl/cxlmem.h      | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 27e63e6dab7c..78ca7ebc3e55 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -4132,6 +4132,7 @@ int cxl_memdev_attach_region(struct cxl_memdev *cxlmd)
 	if (rc)
 		return rc;
 
+	attach->cxlr = cxlr;
 	attach->hpa_range = (struct range) {
 		.start = cxlr->params.res->start,
 		.end = cxlr->params.res->end,
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index c401e3a1af06..c598561b8e5f 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -104,6 +104,7 @@ struct cxl_memdev_attach {
 /**
  * struct cxl_attach_region - coordinate mapping a region at memdev registration
  * @attach: common core attachment descriptor
+ * @cxlr: cxl region the memdev is attached to.
  * @hpa_range: physical address range of the region
  *
  * For the common simple case of a CXL device with private (non-general purpose
@@ -112,6 +113,7 @@ struct cxl_memdev_attach {
  */
 struct cxl_attach_region {
 	struct cxl_memdev_attach attach;
+	struct cxl_region *cxlr;
 	struct range hpa_range;
 };
 
-- 
2.34.1