linux-kernel - [PATCH 5/5] cxl/acpi: Enable address translation for Zen4 platforms

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Date: Fri, 28 Jun 2024 00:46:14 +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 5/5] cxl/acpi: Enable address translation for Zen4 platforms

Enable address translation for Zen4 platforms.

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 | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 67f73a831bd3..9e7b9629b98d 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -11,6 +11,10 @@
 #include "cxlpci.h"
 #include "cxl.h"
 
+#ifdef CONFIG_X86
+#include <asm/cpu.h>
+#endif
+
 #define CXL_RCRB_SIZE	SZ_8K
 
 struct cxl_cxims_data {
@@ -536,9 +540,14 @@ static int cxl_get_chbs(struct device *dev, struct acpi_device *hb,
 	return 0;
 }
 
+static bool is_amd_zen4(void)
+{
+	return (IS_ENABLED(CONFIG_X86) && boot_cpu_has(X86_FEATURE_ZEN4));
+}
+
 static void setup_platform_quirks(struct cxl_root *root)
 {
-	root->hpa_xlat_enable = 0;
+	root->hpa_xlat_enable = is_amd_zen4();
 }
 
 static int get_genport_coordinates(struct device *dev, struct cxl_dport *dport)
-- 
2.39.2