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Date:   Thu, 23 Nov 2023 01:48:16 +0100
From:   Armin Wolf <W_Armin@....de>
To:     pali@...nel.org
Cc:     jdelvare@...e.com, linux@...ck-us.net, hdegoede@...hat.com,
        markgross@...nel.org, ilpo.jarvinen@...ux.intel.com,
        platform-driver-x86@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/9] hwmon: (dell-smm) Move config entries out of i8k_dmi_table

Currently, i8k_dmi_table contains both entries used for DMI
matching and entries used to override config options. This
does not allow for differentiating between "its safe to issue
raw SMM calls on this machine" and "its not safe to issue raw
SMM calls on this machine, but here are some config values".

Since future SMM backends will need to differentiate between
those two cases, move those config entries into a separate
table. i8k_dmi_table now serves as a general "its safe to issue
raw SMM calls" table.

Tested-by: <serverror@...verror.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/hwmon/dell-smm-hwmon.c | 129 +++++++++++++++++++--------------
 1 file changed, 73 insertions(+), 56 deletions(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 158b366b0329..b60755070d86 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -1078,42 +1078,6 @@ static int __init dell_smm_init_hwmon(struct device *dev)
 	return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev);
 }

-struct i8k_config_data {
-	uint fan_mult;
-	uint fan_max;
-};
-
-enum i8k_configs {
-	DELL_LATITUDE_D520,
-	DELL_PRECISION_490,
-	DELL_STUDIO,
-	DELL_XPS,
-};
-
-/*
- * Only use for machines which need some special configuration
- * in order to work correctly (e.g. if autoconfig fails on this machines).
- */
-
-static const struct i8k_config_data i8k_config_data[] __initconst = {
-	[DELL_LATITUDE_D520] = {
-		.fan_mult = 1,
-		.fan_max = I8K_FAN_TURBO,
-	},
-	[DELL_PRECISION_490] = {
-		.fan_mult = 1,
-		.fan_max = I8K_FAN_TURBO,
-	},
-	[DELL_STUDIO] = {
-		.fan_mult = 1,
-		.fan_max = I8K_FAN_HIGH,
-	},
-	[DELL_XPS] = {
-		.fan_mult = 1,
-		.fan_max = I8K_FAN_HIGH,
-	},
-};
-
 static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 	{
 		.ident = "Dell G5 5590",
@@ -1143,14 +1107,6 @@ static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 		},
 	},
-	{
-		.ident = "Dell Latitude D520",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
-		},
-		.driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
-	},
 	{
 		.ident = "Dell Latitude 2",
 		.matches = {
@@ -1172,15 +1128,6 @@ static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
 		},
 	},
-	{
-		.ident = "Dell Precision 490",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME,
-				  "Precision WorkStation 490"),
-		},
-		.driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
-	},
 	{
 		.ident = "Dell Precision",
 		.matches = {
@@ -1201,7 +1148,6 @@ static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
 		},
-		.driver_data = (void *)&i8k_config_data[DELL_STUDIO],
 	},
 	{
 		.ident = "Dell XPS M140",
@@ -1209,7 +1155,6 @@ static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 			DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
 		},
-		.driver_data = (void *)&i8k_config_data[DELL_XPS],
 	},
 	{
 		.ident = "Dell XPS",
@@ -1223,6 +1168,78 @@ static const struct dmi_system_id i8k_dmi_table[] __initconst = {

 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);

+/*
+ * Only use for machines which need some special configuration
+ * in order to work correctly (e.g. if autoconfig fails on this machines).
+ */
+struct i8k_config_data {
+	uint fan_mult;
+	uint fan_max;
+};
+
+enum i8k_configs {
+	DELL_LATITUDE_D520,
+	DELL_PRECISION_490,
+	DELL_STUDIO,
+	DELL_XPS,
+};
+
+static const struct i8k_config_data i8k_config_data[] __initconst = {
+	[DELL_LATITUDE_D520] = {
+		.fan_mult = 1,
+		.fan_max = I8K_FAN_TURBO,
+	},
+	[DELL_PRECISION_490] = {
+		.fan_mult = 1,
+		.fan_max = I8K_FAN_TURBO,
+	},
+	[DELL_STUDIO] = {
+		.fan_mult = 1,
+		.fan_max = I8K_FAN_HIGH,
+	},
+	[DELL_XPS] = {
+		.fan_mult = 1,
+		.fan_max = I8K_FAN_HIGH,
+	},
+};
+
+static const struct dmi_system_id i8k_config_dmi_table[] __initconst = {
+	{
+		.ident = "Dell Latitude D520",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
+		},
+		.driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
+	},
+	{
+		.ident = "Dell Precision 490",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME,
+				  "Precision WorkStation 490"),
+		},
+		.driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
+	},
+	{
+		.ident = "Dell Studio",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
+		},
+		.driver_data = (void *)&i8k_config_data[DELL_STUDIO],
+	},
+	{
+		.ident = "Dell XPS M140",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
+		},
+		.driver_data = (void *)&i8k_config_data[DELL_XPS],
+	},
+	{ }
+};
+
 /*
  * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
  * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
@@ -1438,7 +1455,7 @@ static void __init dell_smm_init_dmi(void)
 	 * Set fan multiplier and maximal fan speed from DMI config.
 	 * Values specified in module parameters override values from DMI.
 	 */
-	id = dmi_first_match(i8k_dmi_table);
+	id = dmi_first_match(i8k_config_dmi_table);
 	if (id && id->driver_data) {
 		config = id->driver_data;
 		if (!fan_mult && config->fan_mult)
--
2.39.2

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