linux-kernel - [PATCH v2 5/5] cxl/acpi: Enable address translation for Zen4 platforms

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Message-ID: <20240701174754.967954-6-rrichter@amd.com>
Date: Mon, 1 Jul 2024 19:47:53 +0200
From: Robert Richter <rrichter@....com>
To: Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, Jonathan Cameron <jonathan.cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>, Davidlohr Bueso <dave@...olabs.net>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Robert
 Richter" <rrichter@....com>
Subject: [PATCH v2 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..70fdb806016e 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 {
@@ -538,7 +542,12 @@ static int cxl_get_chbs(struct device *dev, struct acpi_device *hb,
 
 static void setup_platform_quirks(struct cxl_root *root)
 {
-	root->hpa_xlat_enable = 0;
+#ifdef CONFIG_X86_64
+	bool is_amd_zen4 = boot_cpu_has(X86_FEATURE_ZEN4);
+#else
+	bool is_amd_zen4 = false;
+#endif
+	root->hpa_xlat_enable = is_amd_zen4;
 }
 
 static int get_genport_coordinates(struct device *dev, struct cxl_dport *dport)
-- 
2.39.2