diff mbox series

[v5,26/27] cxl: add function for obtaining params from a region

Message ID 20241118164434.7551-27-alejandro.lucero-palau@amd.com (mailing list archive)
State New
Headers show
Series cxl: add type2 device basic support | expand

Commit Message

Lucero Palau, Alejandro Nov. 18, 2024, 4:44 p.m. UTC 
From: Alejandro Lucero <alucerop@amd.com>

A CXL region struct contains the physical address to work with.

Add a function for given a opaque cxl region struct returns the params
to be used for mapping such memory range.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
---
 drivers/cxl/core/region.c | 16 ++++++++++++++++
 drivers/cxl/cxl.h         |  2 ++
 include/cxl/cxl.h         |  2 ++
 3 files changed, 20 insertions(+)
diff mbox series

Patch

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index eff3ad788077..fa44a60549f7 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2663,6 +2663,22 @@  static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd,
 	return ERR_PTR(rc);
 }
 
+int cxl_get_region_params(struct cxl_region *region, resource_size_t *start,
+			  resource_size_t *end)
+{
+	if (!region)
+		return -ENODEV;
+
+	if (!region->params.res)
+		return -ENOSPC;
+
+	*start = region->params.res->start;
+	*end = region->params.res->end;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_get_region_params, CXL);
+
 static ssize_t __create_region_show(struct cxl_root_decoder *cxlrd, char *buf)
 {
 	return sysfs_emit(buf, "region%u\n", atomic_read(&cxlrd->region_id));
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index ee3385db5663..7b46d313e581 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -913,6 +913,8 @@  void cxl_coordinates_combine(struct access_coordinate *out,
 
 bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port);
 
+int cxl_get_region_params(struct cxl_region *region, resource_size_t *start,
+			  resource_size_t *end);
 /*
  * Unit test builds overrides this to __weak, find the 'strong' version
  * of these symbols in tools/testing/cxl/.
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
index 2a8ebabfc1dd..f14a3f292ad8 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -77,4 +77,6 @@  struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
 				     bool avoid_dax);
 
 int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled);
+int cxl_get_region_params(struct cxl_region *region, resource_size_t *start,
+			  resource_size_t *end);
 #endif