netdev - [PATCH v2 14/15] cxl: add function for obtaining params from a region

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Message-ID: <20240715172835.24757-15-alejandro.lucero-palau@amd.com>
Date: Mon, 15 Jul 2024 18:28:34 +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>, <richard.hughes@....com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v2 14/15] 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             |  3 +++
 include/linux/cxl_accel_mem.h |  2 ++
 3 files changed, 21 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index c8fc14ac437e..9ff10923e9fc 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -3345,6 +3345,22 @@ static int devm_cxl_add_dax_region(struct cxl_region *cxlr)
 	return rc;
 }
 
+int cxl_accel_get_region_params(struct cxl_region *region,
+				resource_size_t *start, resource_size_t *end)
+{
+	if (!region)
+		return -ENODEV;
+
+	if (!region->params.res) {
+		return -ENODEV;
+	}
+	*start = region->params.res->start;
+	*end = region->params.res->end;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_accel_get_region_params, CXL);
+
 static int match_root_decoder_by_range(struct device *dev, void *data)
 {
 	struct range *r1, *r2 = data;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 1bf3b74ff959..b4c4c4455ef1 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -906,6 +906,9 @@ void cxl_coordinates_combine(struct access_coordinate *out,
 bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port);
 
 int cxl_region_detach(struct cxl_endpoint_decoder *cxled);
+
+int cxl_accel_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_accel_mem.h b/include/linux/cxl_accel_mem.h
index a5f9ffc24509..5d715eea6e91 100644
--- a/include/linux/cxl_accel_mem.h
+++ b/include/linux/cxl_accel_mem.h
@@ -53,4 +53,6 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
 				     int ways);
 
 int cxl_region_detach(struct cxl_endpoint_decoder *cxled);
+int cxl_accel_get_region_params(struct cxl_region *region,
+				resource_size_t *start, resource_size_t *end);
 #endif
-- 
2.17.1