linux-kernel - [PATCH v2 07/17] hwmon: Fix Intel Family-model checks to include extended Families

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250211194407.2577252-8-sohil.mehta@intel.com>
Date: Tue, 11 Feb 2025 19:43:57 +0000
From: Sohil Mehta <sohil.mehta@...el.com>
To: x86@...nel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	"H . Peter Anvin" <hpa@...or.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Zhang Rui <rui.zhang@...el.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	David Laight <david.laight.linux@...il.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-hwmon@...r.kernel.org
Subject: [PATCH v2 07/17] hwmon: Fix Intel Family-model checks to include extended Families

The current Intel Family-model checks in the coretemp driver seem to
implicitly assume Family 6. Extend the checks to include the extended
Family numbers 18 and 19 as well.

Also, add explicit checks for Family 6 in places where it is assumed
implicitly.

Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
Acked-by: Guenter Roeck <linux@...ck-us.net>

---

v2: No change. Pickup Ack from Guenter Roeck.

---
 drivers/hwmon/coretemp.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 1b9203b20d70..1aa67a2b5f18 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -185,6 +185,13 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 			return tjmax_table[i].tjmax;
 	}
 
+	/*
+	 * Return without adjustment if the Family isn't 6.
+	 * The rest of the function assumes Family 6.
+	 */
+	if (c->x86 != 6)
+		return tjmax;
+
 	for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
 		const struct tjmax_model *tm = &tjmax_model_table[i];
 		if (c->x86_model == tm->model &&
@@ -260,14 +267,17 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 
 static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
 {
+	u8 family = c->x86;
 	u8 model = c->x86_model;
 
-	return model > 0xe &&
-	       model != 0x1c &&
-	       model != 0x26 &&
-	       model != 0x27 &&
-	       model != 0x35 &&
-	       model != 0x36;
+	return family > 15 ||
+	       (family == 6 &&
+		model > 0xe &&
+		model != 0x1c &&
+		model != 0x26 &&
+		model != 0x27 &&
+		model != 0x35 &&
+		model != 0x36);
 }
 
 static int get_tjmax(struct temp_data *tdata, struct device *dev)
@@ -460,7 +470,7 @@ static int chk_ucode_version(unsigned int cpu)
 	 * Readings might stop update when processor visited too deep sleep,
 	 * fixed for stepping D0 (6EC).
 	 */
-	if (c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
+	if (c->x86 == 6 && c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
 		pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
 		return -ENODEV;
 	}
@@ -580,7 +590,7 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
 	 * MSR_IA32_TEMPERATURE_TARGET register. Atoms don't have the register
 	 * at all.
 	 */
-	if (c->x86_model > 0xe && c->x86_model != 0x1c)
+	if (c->x86 > 15 || (c->x86 == 6 && c->x86_model > 0xe && c->x86_model != 0x1c))
 		if (get_ttarget(tdata, &pdev->dev) >= 0)
 			tdata->attr_size++;
 
-- 
2.43.0