[tip: x86/misc] hwmon: (k10temp) Define a helper function to read CCD temperature

[tip-bot2 for Yazen Ghannam]

The following commit has been merged into the x86/misc branch of tip:

Commit-ID:     cc66126fd317a70d8612a8356ad512a1539abd75
Gitweb:        https://git.kernel.org/tip/cc66126fd317a70d8612a8356ad512a1539abd75
Author:        Yazen Ghannam <yazen.ghannam@xxxxxxx>
AuthorDate:    Thu, 06 Jun 2024 11:12:58 -05:00
Committer:     Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Wed, 12 Jun 2024 11:39:29 +02:00

hwmon: (k10temp) Define a helper function to read CCD temperature

The CCD temperature register is read in two places. These reads are done
using an AMD SMN access, and a number of parameters are needed for the
operation.

Move the SMN access and parameter gathering into a helper function in order to
simplify the code flow. This also has a benefit of centralizing the hardware
register access in a single place in case fixes or special decoding is required.

Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Acked-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240606-fix-smn-bad-read-v4-5-ffde21931c3f@xxxxxxx
---
 drivers/hwmon/k10temp.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 6cad35e..315c52d 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -158,6 +158,13 @@ static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
 		*regval = 0;
 }
 
+static int read_ccd_temp_reg(struct k10temp_data *data, int ccd, u32 *regval)
+{
+	u16 node_id = amd_pci_dev_to_node_id(data->pdev);
+
+	return amd_smn_read(node_id, ZEN_CCD_TEMP(data->ccd_offset, ccd), regval);
+}
+
 static long get_raw_temp(struct k10temp_data *data)
 {
 	u32 regval;
@@ -223,9 +230,7 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 				*val = 0;
 			break;
 		case 2 ... 13:		/* Tccd{1-12} */
-			ret = amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
-					   ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
-					   &regval);
+			ret = read_ccd_temp_reg(data, channel - 2, &regval);
 
 			if (ret)
 				return ret;
@@ -397,8 +402,7 @@ static void k10temp_get_ccd_support(struct pci_dev *pdev,
 		 * the register value. And this will incorrectly pass the TEMP_VALID
 		 * bit check.
 		 */
-		if (amd_smn_read(amd_pci_dev_to_node_id(pdev),
-				 ZEN_CCD_TEMP(data->ccd_offset, i), &regval))
+		if (read_ccd_temp_reg(data, i, &regval))
 			continue;
 
 		if (regval & ZEN_CCD_TEMP_VALID)