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Message-Id: <20231104155559.11842-2-W_Armin@gmx.de>
Date: Sat, 4 Nov 2023 16:55:51 +0100
From: Armin Wolf <W_Armin@....de>
To: pali@...nel.org
Cc: hdegoede@...hat.com, markgross@...nel.org,
ilpo.jarvinen@...ux.intel.com, jdelvare@...e.com,
linux@...ck-us.net, platform-driver-x86@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/9] hwmon: (dell-smm) Prepare for multiple SMM calling backends
Modern Dell machines support multiple ways to issue an SMM call.
Prepare support for those by introducing dell_smm_ops, which is
used by dell_smm_call() to perform a SMM call. Each SMM backend
needs to provide a dell_smm_ops structure.
Signed-off-by: Armin Wolf <W_Armin@....de>
---
drivers/hwmon/dell-smm-hwmon.c | 131 ++++++++++++++++++++-------------
1 file changed, 79 insertions(+), 52 deletions(-)
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 44aaf9b9191d..a3273780f7c3 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -69,6 +69,20 @@
#define DELL_SMM_NO_TEMP 10
#define DELL_SMM_NO_FANS 3
+struct smm_regs {
+ int eax;
+ int ebx;
+ int ecx;
+ int edx;
+ int esi;
+ int edi;
+};
+
+struct dell_smm_ops {
+ struct device *smm_dev;
+ int (*smm_call)(struct device *smm_dev, struct smm_regs *regs);
+};
+
struct dell_smm_data {
struct mutex i8k_mutex; /* lock for sensors writes */
char bios_version[4];
@@ -84,6 +98,7 @@ struct dell_smm_data {
bool fan[DELL_SMM_NO_FANS];
int fan_type[DELL_SMM_NO_FANS];
int *fan_nominal_speed[DELL_SMM_NO_FANS];
+ const struct dell_smm_ops *ops;
};
struct dell_smm_cooling_data {
@@ -123,15 +138,6 @@ static uint fan_max;
module_param(fan_max, uint, 0);
MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
-struct smm_regs {
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- unsigned int esi;
- unsigned int edi;
-};
-
static const char * const temp_labels[] = {
"CPU",
"GPU",
@@ -171,12 +177,8 @@ static inline const char __init *i8k_get_dmi_data(int field)
*/
static int i8k_smm_func(void *par)
{
- ktime_t calltime = ktime_get();
struct smm_regs *regs = par;
- int eax = regs->eax;
- int ebx = regs->ebx;
unsigned char carry;
- long long duration;
/* SMM requires CPU 0 */
if (smp_processor_id() != 0)
@@ -193,14 +195,7 @@ static int i8k_smm_func(void *par)
"+S" (regs->esi),
"+D" (regs->edi));
- duration = ktime_us_delta(ktime_get(), calltime);
- pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x carry: %d (took %7lld usecs)\n",
- eax, ebx, regs->eax & 0xffff, carry, duration);
-
- if (duration > DELL_SMM_MAX_DURATION)
- pr_warn_once("SMM call took %lld usecs!\n", duration);
-
- if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
+ if (carry)
return -EINVAL;
return 0;
@@ -209,7 +204,7 @@ static int i8k_smm_func(void *par)
/*
* Call the System Management Mode BIOS.
*/
-static int i8k_smm(struct smm_regs *regs)
+static int i8k_smm_call(struct device *dummy, struct smm_regs *regs)
{
int ret;
@@ -220,6 +215,37 @@ static int i8k_smm(struct smm_regs *regs)
return ret;
}
+static const struct dell_smm_ops i8k_smm_ops = {
+ .smm_call = i8k_smm_call,
+};
+
+static int dell_smm_call(const struct dell_smm_ops *ops, struct smm_regs *regs)
+{
+ int eax = regs->eax;
+ int ebx = regs->ebx;
+ long long duration;
+ ktime_t calltime;
+ int ret;
+
+ calltime = ktime_get();
+ ret = ops->smm_call(ops->smm_dev, regs);
+ duration = ktime_us_delta(ktime_get(), calltime);
+
+ pr_debug("SMM(0x%.4x 0x%.4x) = 0x%.4x status: %d (took %7lld usecs)\n",
+ eax, ebx, regs->eax & 0xffff, ret, duration);
+
+ if (duration > DELL_SMM_MAX_DURATION)
+ pr_warn_once("SMM call took %lld usecs!\n", duration);
+
+ if (ret < 0)
+ return ret;
+
+ if ((regs->eax & 0xffff) == 0xffff || regs->eax == eax)
+ return -EINVAL;
+
+ return 0;
+}
+
/*
* Read the fan status.
*/
@@ -233,7 +259,7 @@ static int i8k_get_fan_status(const struct dell_smm_data *data, u8 fan)
if (data->disallow_fan_support)
return -EINVAL;
- return i8k_smm(®s) ? : regs.eax & 0xff;
+ return dell_smm_call(data->ops, ®s) ? : regs.eax & 0xff;
}
/*
@@ -249,7 +275,7 @@ static int i8k_get_fan_speed(const struct dell_smm_data *data, u8 fan)
if (data->disallow_fan_support)
return -EINVAL;
- return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
+ return dell_smm_call(data->ops, ®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
}
/*
@@ -265,7 +291,7 @@ static int _i8k_get_fan_type(const struct dell_smm_data *data, u8 fan)
if (data->disallow_fan_support || data->disallow_fan_type_call)
return -EINVAL;
- return i8k_smm(®s) ? : regs.eax & 0xff;
+ return dell_smm_call(data->ops, ®s) ? : regs.eax & 0xff;
}
static int i8k_get_fan_type(struct dell_smm_data *data, u8 fan)
@@ -290,7 +316,7 @@ static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, u8
if (data->disallow_fan_support)
return -EINVAL;
- return i8k_smm(®s) ? : (regs.eax & 0xffff);
+ return dell_smm_call(data->ops, ®s) ? : (regs.eax & 0xffff);
}
/*
@@ -304,7 +330,7 @@ static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enabl
return -EINVAL;
regs.eax = enable ? data->auto_fan : data->manual_fan;
- return i8k_smm(®s);
+ return dell_smm_call(data->ops, ®s);
}
/*
@@ -320,35 +346,35 @@ static int i8k_set_fan(const struct dell_smm_data *data, u8 fan, int speed)
speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed);
regs.ebx = fan | (speed << 8);
- return i8k_smm(®s);
+ return dell_smm_call(data->ops, ®s);
}
-static int __init i8k_get_temp_type(u8 sensor)
+static int __init i8k_get_temp_type(const struct dell_smm_data *data, u8 sensor)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_TEMP_TYPE,
.ebx = sensor,
};
- return i8k_smm(®s) ? : regs.eax & 0xff;
+ return dell_smm_call(data->ops, ®s) ? : regs.eax & 0xff;
}
/*
* Read the cpu temperature.
*/
-static int _i8k_get_temp(u8 sensor)
+static int _i8k_get_temp(const struct dell_smm_data *data, u8 sensor)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_TEMP,
.ebx = sensor,
};
- return i8k_smm(®s) ? : regs.eax & 0xff;
+ return dell_smm_call(data->ops, ®s) ? : regs.eax & 0xff;
}
-static int i8k_get_temp(u8 sensor)
+static int i8k_get_temp(const struct dell_smm_data *data, u8 sensor)
{
- int temp = _i8k_get_temp(sensor);
+ int temp = _i8k_get_temp(data, sensor);
/*
* Sometimes the temperature sensor returns 0x99, which is out of range.
@@ -359,7 +385,7 @@ static int i8k_get_temp(u8 sensor)
*/
if (temp == 0x99) {
msleep(100);
- temp = _i8k_get_temp(sensor);
+ temp = _i8k_get_temp(data, sensor);
}
/*
* Return -ENODATA for all invalid temperatures.
@@ -375,12 +401,12 @@ static int i8k_get_temp(u8 sensor)
return temp;
}
-static int __init i8k_get_dell_signature(int req_fn)
+static int __init dell_smm_get_signature(const struct dell_smm_ops *ops, int req_fn)
{
struct smm_regs regs = { .eax = req_fn, };
int rc;
- rc = i8k_smm(®s);
+ rc = dell_smm_call(ops, ®s);
if (rc < 0)
return rc;
@@ -392,12 +418,12 @@ static int __init i8k_get_dell_signature(int req_fn)
/*
* Read the Fn key status.
*/
-static int i8k_get_fn_status(void)
+static int i8k_get_fn_status(const struct dell_smm_data *data)
{
struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
int rc;
- rc = i8k_smm(®s);
+ rc = dell_smm_call(data->ops, ®s);
if (rc < 0)
return rc;
@@ -416,12 +442,12 @@ static int i8k_get_fn_status(void)
/*
* Read the power status.
*/
-static int i8k_get_power_status(void)
+static int i8k_get_power_status(const struct dell_smm_data *data)
{
struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
int rc;
- rc = i8k_smm(®s);
+ rc = dell_smm_call(data->ops, ®s);
if (rc < 0)
return rc;
@@ -464,15 +490,15 @@ static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
return 0;
case I8K_FN_STATUS:
- val = i8k_get_fn_status();
+ val = i8k_get_fn_status(data);
break;
case I8K_POWER_STATUS:
- val = i8k_get_power_status();
+ val = i8k_get_power_status(data);
break;
case I8K_GET_TEMP:
- val = i8k_get_temp(0);
+ val = i8k_get_temp(data, 0);
break;
case I8K_GET_SPEED:
@@ -539,14 +565,14 @@ static int i8k_proc_show(struct seq_file *seq, void *offset)
int fn_key, cpu_temp, ac_power;
int left_fan, right_fan, left_speed, right_speed;
- cpu_temp = i8k_get_temp(0); /* 11100 µs */
+ cpu_temp = i8k_get_temp(data, 0); /* 11100 µs */
left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */
right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */
left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */
right_speed = i8k_get_fan_speed(data, I8K_FAN_RIGHT); /* 580 µs */
- fn_key = i8k_get_fn_status(); /* 750 µs */
+ fn_key = i8k_get_fn_status(data); /* 750 µs */
if (power_status)
- ac_power = i8k_get_power_status(); /* 14700 µs */
+ ac_power = i8k_get_power_status(data); /* 14700 µs */
else
ac_power = -1;
@@ -665,7 +691,7 @@ static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types
switch (attr) {
case hwmon_temp_input:
/* _i8k_get_temp() is fine since we do not care about the actual value */
- if (data->temp_type[channel] >= 0 || _i8k_get_temp(channel) >= 0)
+ if (data->temp_type[channel] >= 0 || _i8k_get_temp(data, channel) >= 0)
return 0444;
break;
@@ -747,7 +773,7 @@ static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 a
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
- ret = i8k_get_temp(channel);
+ ret = i8k_get_temp(data, channel);
if (ret < 0)
return ret;
@@ -994,7 +1020,7 @@ static int __init dell_smm_init_hwmon(struct device *dev)
u8 i;
for (i = 0; i < DELL_SMM_NO_TEMP; i++) {
- data->temp_type[i] = i8k_get_temp_type(i);
+ data->temp_type[i] = i8k_get_temp_type(data, i);
if (data->temp_type[i] < 0)
continue;
@@ -1353,6 +1379,7 @@ static int __init dell_smm_probe(struct platform_device *pdev)
mutex_init(&data->i8k_mutex);
platform_set_drvdata(pdev, data);
+ data->ops = &i8k_smm_ops;
if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
if (!force) {
@@ -1445,8 +1472,8 @@ static int __init i8k_init(void)
/*
* Get SMM Dell signature
*/
- if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
- i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
+ if (dell_smm_get_signature(&i8k_smm_ops, I8K_SMM_GET_DELL_SIG1) &&
+ dell_smm_get_signature(&i8k_smm_ops, I8K_SMM_GET_DELL_SIG2)) {
if (!force)
return -ENODEV;
--
2.39.2
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