Hi Guenter,
On 12/12/2019 10:24 PM, Guenter Roeck wrote:
On 12/11/19 11:46 AM, Jae Hyun Yoo wrote:
This commit adds PECI cputemp hwmon driver.
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Jean Delvare <jdelvare@xxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: Andrew Jeffery <andrew@xxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Jason M Biils <jason.m.bills@xxxxxxxxxxxxxxx>
Cc: Joel Stanley <joel@xxxxxxxxx>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: Stef van Os <stef.van.os@xxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>
Reviewed-by: Haiyue Wang <haiyue.wang@xxxxxxxxxxxxxxx>
Reviewed-by: James Feist <james.feist@xxxxxxxxxxxxxxx>
Reviewed-by: Vernon Mauery <vernon.mauery@xxxxxxxxxxxxxxx>
Acked-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
Changes since v10:
- Added Skylake Xeon D support.
- Added DTS temperature which is more thermal control friendlier than Die
temperature.
- Fixed minor bugs and style issues.
drivers/hwmon/Kconfig | 14 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/peci-cputemp.c | 448 +++++++++++++++++++++++++++++++++++
drivers/hwmon/peci-hwmon.h | 46 ++++
4 files changed, 509 insertions(+)
create mode 100644 drivers/hwmon/peci-cputemp.c
create mode 100644 drivers/hwmon/peci-hwmon.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 23dfe848979a..b6604759579c 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1349,6 +1349,20 @@ config SENSORS_PCF8591
These devices are hard to detect and rarely found on mainstream
hardware. If unsure, say N.
+config SENSORS_PECI_CPUTEMP
+ tristate "PECI CPU temperature monitoring client"
+ depends on PECI
+ select MFD_INTEL_PECI_CLIENT
+ help
+ If you say yes here you get support for the generic Intel PECI
+ cputemp driver which provides Digital Thermal Sensor (DTS) thermal
+ readings of the CPU package and CPU cores that are accessible
using
+ the PECI Client Command Suite via the processor PECI client.
+ Check <file:Documentation/hwmon/peci-cputemp.rst> for details.
+
+ This driver can also be built as a module. If so, the module
+ will be called peci-cputemp.
+
source "drivers/hwmon/pmbus/Kconfig"
config SENSORS_PWM_FAN
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 6db5db9cdc29..d6fea48697af 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -144,6 +144,7 @@ obj-$(CONFIG_SENSORS_NTC_THERMISTOR) +=
ntc_thermistor.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
+obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o
obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o
diff --git a/drivers/hwmon/peci-cputemp.c b/drivers/hwmon/peci-cputemp.c
new file mode 100644
index 000000000000..70ced9f9299f
--- /dev/null
+++ b/drivers/hwmon/peci-cputemp.c
@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018-2019 Intel Corporation
+
+#include <linux/hwmon.h>
+#include <linux/jiffies.h>
+#include <linux/mfd/intel-peci-client.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include "peci-hwmon.h"
+
+#define DEFAULT_CHANNEL_NUMS 5
+#define CORETEMP_CHANNEL_NUMS CORE_NUMS_MAX
Why not just use CORE_NUMS_MAX ?
For better readability in below code to represent max core numbers
as core temp channel numbers. If you don't like it, I'll use
CORE_NUMS_MAX as it is for the core temp channel numbers.
+#define CPUTEMP_CHANNEL_NUMS (DEFAULT_CHANNEL_NUMS +
CORETEMP_CHANNEL_NUMS)
+
+struct temp_group {
+ struct peci_sensor_data die;
+ struct peci_sensor_data dts;
+ struct peci_sensor_data tcontrol;
+ struct peci_sensor_data tthrottle;
+ struct peci_sensor_data tjmax;
+ struct peci_sensor_data core[CORETEMP_CHANNEL_NUMS];
+};
+
+struct peci_cputemp {
+ struct peci_client_manager *mgr;
+ struct device *dev;
+ char name[PECI_NAME_SIZE];
+ const struct cpu_gen_info *gen_info;
+ struct temp_group temp;
+ u64 core_mask;
+ u32 temp_config[CPUTEMP_CHANNEL_NUMS + 1];
+ uint config_idx;
+ struct hwmon_channel_info temp_info;
+ const struct hwmon_channel_info *info[2];
+ struct hwmon_chip_info chip;
+};
+
+enum cputemp_channels {
+ channel_die,
+ channel_dts,
+ channel_tcontrol,
+ channel_tthrottle,
+ channel_tjmax,
+ channel_core,
+};
+
+static const u32 config_table[DEFAULT_CHANNEL_NUMS + 1] = {
+ /* Die temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+ HWMON_T_CRIT_HYST,
+
+ /* DTS margin */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+ HWMON_T_CRIT_HYST,
+
+ /* Tcontrol temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_CRIT,
+
+ /* Tthrottle temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT,
+
+ /* Tjmax temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT,
+
+ /* Core temperature - for all core channels */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+ HWMON_T_CRIT_HYST,
+};
+
+static const char *cputemp_label[CPUTEMP_CHANNEL_NUMS] = {
+ "Die",
+ "DTS",
+ "Tcontrol",
+ "Tthrottle",
+ "Tjmax",
+ "Core 0", "Core 1", "Core 2", "Core 3",
+ "Core 4", "Core 5", "Core 6", "Core 7",
+ "Core 8", "Core 9", "Core 10", "Core 11",
+ "Core 12", "Core 13", "Core 14", "Core 15",
+ "Core 16", "Core 17", "Core 18", "Core 19",
+ "Core 20", "Core 21", "Core 22", "Core 23",
+ "Core 24", "Core 25", "Core 26", "Core 27",
+};
+
What happens if CPUTEMP_CHANNEL_NUMS is increased in the future,
and some of this array includes NULL pointers because this file
doesn't track CORE_NUMS_MAX ?
Okay. It's reasonable concern. I'll fix it to make this driver generate
the core temp label strings dynamically based on detected CPU generation
information.
+static s32 ten_dot_six_to_millidegree(s32 val)
+{
+ return ((val ^ 0x8000) - 0x8000) * 1000 / 64;
Normally I suggest to use DIV_ROUND_CLOSEST in situations like this
to improve rounding, but ultimately that is your call.
This is for conversion of 16-bit signed 10.6
(10 bits signed decimal, 6 bits fractional) format to 32-bits signed
integer in millidegree units. It's right as it is.
+}
+
+static int get_temp_targets(struct peci_cputemp *priv)
+{
+ s32 tthrottle_offset;
+ s32 tcontrol_margin;
+ u8 pkg_cfg[4];
+ int ret;
+
+ /*
+ * Just use only the tcontrol marker to determine if target
values need
+ * update.
+ */
+ if (!peci_sensor_need_update(&priv->temp.tcontrol))
+ return 0;
+
+ ret = peci_client_read_package_config(priv->mgr,
+ PECI_MBX_INDEX_TEMP_TARGET, 0,
+ pkg_cfg);
+ if (ret)
+ return ret;
+
+ priv->temp.tjmax.value = pkg_cfg[2] * 1000;
+
+ tcontrol_margin = pkg_cfg[1];
+ tcontrol_margin = ((tcontrol_margin ^ 0x80) - 0x80) * 1000;
+ priv->temp.tcontrol.value = priv->temp.tjmax.value -
tcontrol_margin;
+
+ tthrottle_offset = (pkg_cfg[3] & 0x2f) * 1000;
+ priv->temp.tthrottle.value = priv->temp.tjmax.value -
tthrottle_offset;
+
+ peci_sensor_mark_updated(&priv->temp.tcontrol);
+
+ return 0;
+}
+
+static int get_die_temp(struct peci_cputemp *priv)
+{
+ struct peci_get_temp_msg msg;
+ int ret;
+
+ if (!peci_sensor_need_update(&priv->temp.die))
+ return 0;
+
+ msg.addr = priv->mgr->client->addr;
+
+ ret = peci_command(priv->mgr->client->adapter, PECI_CMD_GET_TEMP,
&msg);
+ if (ret)
+ return ret;
+
+ /* Note that the tjmax should be available before calling it */
+ priv->temp.die.value = priv->temp.tjmax.value +
+ (msg.temp_raw * 1000 / 64);
+
+ peci_sensor_mark_updated(&priv->temp.die);
+
+ return 0;
+}
+
+static int get_dts(struct peci_cputemp *priv)
+{
+ s32 dts_margin;
+ u8 pkg_cfg[4];
+ int ret;
+
+ if (!peci_sensor_need_update(&priv->temp.dts))
+ return 0;
+
+ ret = peci_client_read_package_config(priv->mgr,
+ PECI_MBX_INDEX_DTS_MARGIN, 0,
+ pkg_cfg);
+
+ if (ret)
+ return ret;
+
+ dts_margin = (pkg_cfg[1] << 8) | pkg_cfg[0];
+
+ /**
+ * Processors return a value of DTS reading in 10.6 format
+ * (10 bits signed decimal, 6 bits fractional).
+ * Error codes:
+ * 0x8000: General sensor error
+ * 0x8001: Reserved
+ * 0x8002: Underflow on reading value
+ * 0x8003-0x81ff: Reserved
+ */
+ if (dts_margin >= 0x8000 && dts_margin <= 0x81ff)
+ return -EIO;
+
+ dts_margin = ten_dot_six_to_millidegree(dts_margin);
+
+ /* Note that the tcontrol should be available before calling it */
+ priv->temp.dts.value = priv->temp.tcontrol.value - dts_margin;
+
+ peci_sensor_mark_updated(&priv->temp.dts);
+
+ return 0;
+}
+
+static int get_core_temp(struct peci_cputemp *priv, int core_index)
+{
+ s32 core_dts_margin;
+ u8 pkg_cfg[4];
+ int ret;
+
+ if (!peci_sensor_need_update(&priv->temp.core[core_index]))
+ return 0;
+
+ ret = peci_client_read_package_config(priv->mgr,
+ PECI_MBX_INDEX_PER_CORE_DTS_TEMP,
+ core_index, pkg_cfg);
+ if (ret)
+ return ret;
+
+ core_dts_margin = le16_to_cpup((__le16 *)pkg_cfg);
+
Any special readon for using the helper function here but not
above ?
Ah, I have to use le16_to_cpup for the above one too. Thanks!
Thanks a lot for your review!
-Jae
