netdev - [PATCH v4 25/26] cxl: add function for obtaining params from a region

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Message-ID: <20241017165225.21206-26-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Oct 2024 17:52:24 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v4 25/26] cxl: add function for obtaining params from a region

From: Alejandro Lucero <alucerop@....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@....com>
---
 drivers/cxl/core/region.c | 16 ++++++++++++++++
 drivers/cxl/cxl.h         |  2 ++
 include/linux/cxl/cxl.h   |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 7c84d8f89af6..60c3aa6ee404 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2674,6 +2674,22 @@ 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 2ea180f05acd..79fc3f6f29b2 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -904,6 +904,8 @@ 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/linux/cxl/cxl.h b/include/linux/cxl/cxl.h
index c544339c2baf..d76f4ae60fbf 100644
--- a/include/linux/cxl/cxl.h
+++ b/include/linux/cxl/cxl.h
@@ -76,4 +76,6 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
 				     struct cxl_endpoint_decoder *cxled);
 
 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
-- 
2.17.1