linux-kernel - [PATCH 3/5] cxl/acpi: Add platform flag for HPA address translation

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Date: Fri, 28 Jun 2024 00:46:12 +0200
From: Robert Richter <rrichter@....com>
To: Dan Williams <dan.j.williams@...el.com>, Davidlohr Bueso
	<dave@...olabs.net>, Jonathan Cameron <jonathan.cameron@...wei.com>, "Dave
 Jiang" <dave.jiang@...el.com>, Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>, "Robert
 Richter" <rrichter@....com>
Subject: [PATCH 3/5] cxl/acpi: Add platform flag for HPA address translation

Adding an early check to detect platform specifics to (later) enable
HPA address translation. The cxl_root structure is used to store that
information.

Note: The platform check will be added later when enabling address
translation.

Link: https://lore.kernel.org/all/65c68969903b1_afa429460@dwillia2-xfh.jf.intel.com.notmuch/
Cc: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Robert Richter <rrichter@....com>
---
 drivers/cxl/acpi.c | 7 +++++++
 drivers/cxl/cxl.h  | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 571069863c62..67f73a831bd3 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -536,6 +536,11 @@ static int cxl_get_chbs(struct device *dev, struct acpi_device *hb,
 	return 0;
 }
 
+static void setup_platform_quirks(struct cxl_root *root)
+{
+	root->hpa_xlat_enable = 0;
+}
+
 static int get_genport_coordinates(struct device *dev, struct cxl_dport *dport)
 {
 	struct acpi_device *hb = to_cxl_host_bridge(NULL, dev);
@@ -838,6 +843,8 @@ static int cxl_acpi_probe(struct platform_device *pdev)
 		return PTR_ERR(cxl_root);
 	root_port = &cxl_root->port;
 
+	setup_platform_quirks(cxl_root);
+
 	rc = bus_for_each_dev(adev->dev.bus, NULL, root_port,
 			      add_host_bridge_dport);
 	if (rc < 0)
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 603c0120cff8..95d054dc1af0 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -627,10 +627,12 @@ struct cxl_port {
  *
  * @port: cxl_port member
  * @ops: cxl root operations
+ * @hpa_xlat_enable: enable HPA translation
  */
 struct cxl_root {
 	struct cxl_port port;
 	const struct cxl_root_ops *ops;
+	bool hpa_xlat_enable;
 };
 
 static inline struct cxl_root *
-- 
2.39.2