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author | Eugene Shalygin <eugene.shalygin@gmail.com> | 2022-04-27 16:29:59 +0200 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2022-05-20 10:57:06 -0700 |
commit | de8fbac5e59e239b00cdac611784b1bc1ff53d14 (patch) | |
tree | 6dca26daa048189f2ad3b7a321d5ec539cbb27b9 /drivers/hwmon/asus-ec-sensors.c | |
parent | 5cd29012028d997f46518dae0a8133e0985713f3 (diff) | |
download | linux-de8fbac5e59e239b00cdac611784b1bc1ff53d14.tar.gz linux-de8fbac5e59e239b00cdac611784b1bc1ff53d14.tar.bz2 linux-de8fbac5e59e239b00cdac611784b1bc1ff53d14.zip |
hwmon: (asus-ec-sensors) implement locking via the ACPI global lock
For some board models ASUS uses the global ACPI lock to guard access to
the hardware, so do we.
Signed-off-by: Eugene Shalygin <eugene.shalygin@gmail.com>
Link: https://lore.kernel.org/r/20220427143001.1443605-3-eugene.shalygin@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/asus-ec-sensors.c')
-rw-r--r-- | drivers/hwmon/asus-ec-sensors.c | 125 |
1 files changed, 99 insertions, 26 deletions
diff --git a/drivers/hwmon/asus-ec-sensors.c b/drivers/hwmon/asus-ec-sensors.c index 0c82723f85b5..581df4053060 100644 --- a/drivers/hwmon/asus-ec-sensors.c +++ b/drivers/hwmon/asus-ec-sensors.c @@ -56,6 +56,9 @@ static char *mutex_path_override; #define MAX_IDENTICAL_BOARD_VARIATIONS 2 +/* Moniker for the ACPI global lock (':' is not allowed in ASL identifiers) */ +#define ACPI_GLOBAL_LOCK_PSEUDO_PATH ":GLOBAL_LOCK" + typedef union { u32 value; struct { @@ -166,6 +169,14 @@ static const struct ec_sensor_info known_ec_sensors[] = { struct ec_board_info { const char *board_names[MAX_IDENTICAL_BOARD_VARIATIONS]; unsigned long sensors; + /* + * Defines which mutex to use for guarding access to the state and the + * hardware. Can be either a full path to an AML mutex or the + * pseudo-path ACPI_GLOBAL_LOCK_PSEUDO_PATH to use the global ACPI lock, + * or left empty to use a regular mutex object, in which case access to + * the hardware is not guarded. + */ + const char *mutex_path; }; static const struct ec_board_info board_info[] = { @@ -173,6 +184,7 @@ static const struct ec_board_info board_info[] = { .board_names = {"PRIME X570-PRO"}, .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM | SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ProArt X570-CREATOR WIFI"}, @@ -185,6 +197,7 @@ static const struct ec_board_info board_info[] = { .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM | SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG CROSSHAIR VIII DARK HERO"}, @@ -193,6 +206,7 @@ static const struct ec_board_info board_info[] = { SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER | SENSOR_FAN_CPU_OPT | SENSOR_FAN_WATER_FLOW | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG CROSSHAIR VIII FORMULA"}, @@ -200,6 +214,7 @@ static const struct ec_board_info board_info[] = { SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM | SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = { @@ -212,6 +227,7 @@ static const struct ec_board_info board_info[] = { SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET | SENSOR_FAN_WATER_FLOW | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG CROSSHAIR VIII IMPACT"}, @@ -219,12 +235,14 @@ static const struct ec_board_info board_info[] = { SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM | SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG STRIX B550-E GAMING"}, .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM | SENSOR_FAN_CPU_OPT, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG STRIX B550-I GAMING"}, @@ -232,6 +250,7 @@ static const struct ec_board_info board_info[] = { SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM | SENSOR_FAN_VRM_HS | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG STRIX X570-E GAMING"}, @@ -239,17 +258,20 @@ static const struct ec_board_info board_info[] = { SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM | SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG STRIX X570-F GAMING"}, .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, { .board_names = {"ROG STRIX X570-I GAMING"}, .sensors = SENSOR_TEMP_T_SENSOR | SENSOR_FAN_VRM_HS | SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE, + .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX, }, {} }; @@ -259,6 +281,46 @@ struct ec_sensor { s32 cached_value; }; +struct lock_data { + union { + acpi_handle aml; + /* global lock handle */ + u32 glk; + } mutex; + bool (*lock)(struct lock_data *data); + bool (*unlock)(struct lock_data *data); +}; + +/* + * The next function pairs implement options for locking access to the + * state and the EC + */ +static bool lock_via_acpi_mutex(struct lock_data *data) +{ + /* + * ASUS DSDT does not specify that access to the EC has to be guarded, + * but firmware does access it via ACPI + */ + return ACPI_SUCCESS(acpi_acquire_mutex(data->mutex.aml, + NULL, ACPI_LOCK_DELAY_MS)); +} + +static bool unlock_acpi_mutex(struct lock_data *data) +{ + return ACPI_SUCCESS(acpi_release_mutex(data->mutex.aml, NULL)); +} + +static bool lock_via_global_acpi_lock(struct lock_data *data) +{ + return ACPI_SUCCESS(acpi_acquire_global_lock(ACPI_LOCK_DELAY_MS, + &data->mutex.glk)); +} + +static bool unlock_global_acpi_lock(struct lock_data *data) +{ + return ACPI_SUCCESS(acpi_release_global_lock(data->mutex.glk)); +} + struct ec_sensors_data { const struct ec_board_info *board_info; struct ec_sensor *sensors; @@ -269,7 +331,7 @@ struct ec_sensors_data { u8 banks[ASUS_EC_MAX_BANK + 1]; /* in jiffies */ unsigned long last_updated; - acpi_handle aml_mutex; + struct lock_data lock_data; /* number of board EC sensors */ u8 nr_sensors; /* @@ -373,23 +435,36 @@ static void __init fill_ec_registers(struct ec_sensors_data *ec) } } -static acpi_handle __init asus_hw_access_mutex(struct device *dev) +static int __init setup_lock_data(struct device *dev) { const char *mutex_path; - acpi_handle res; int status; + struct ec_sensors_data *state = dev_get_drvdata(dev); mutex_path = mutex_path_override ? - mutex_path_override : ASUS_HW_ACCESS_MUTEX_ASMX; + mutex_path_override : state->board_info->mutex_path; - status = acpi_get_handle(NULL, (acpi_string)mutex_path, &res); - if (ACPI_FAILURE(status)) { - dev_err(dev, - "Could not get hardware access guard mutex '%s': error %d", - mutex_path, status); - return NULL; + if (!mutex_path || !strlen(mutex_path)) { + dev_err(dev, "Hardware access guard mutex name is empty"); + return -EINVAL; } - return res; + if (!strcmp(mutex_path, ACPI_GLOBAL_LOCK_PSEUDO_PATH)) { + state->lock_data.mutex.glk = 0; + state->lock_data.lock = lock_via_global_acpi_lock; + state->lock_data.unlock = unlock_global_acpi_lock; + } else { + status = acpi_get_handle(NULL, (acpi_string)mutex_path, + &state->lock_data.mutex.aml); + if (ACPI_FAILURE(status)) { + dev_err(dev, + "Failed to get hardware access guard AML mutex '%s': error %d", + mutex_path, status); + return -ENOENT; + } + state->lock_data.lock = lock_via_acpi_mutex; + state->lock_data.unlock = unlock_acpi_mutex; + } + return 0; } static int asus_ec_bank_switch(u8 bank, u8 *old) @@ -492,15 +567,9 @@ static int update_ec_sensors(const struct device *dev, { int status; - /* - * ASUS DSDT does not specify that access to the EC has to be guarded, - * but firmware does access it via ACPI - */ - if (ACPI_FAILURE(acpi_acquire_mutex(ec->aml_mutex, NULL, - ACPI_LOCK_DELAY_MS))) { - dev_err(dev, "Failed to acquire AML mutex"); - status = -EBUSY; - goto cleanup; + if (!ec->lock_data.lock(&ec->lock_data)) { + dev_warn(dev, "Failed to acquire mutex"); + return -EBUSY; } status = asus_ec_block_read(dev, ec); @@ -508,10 +577,10 @@ static int update_ec_sensors(const struct device *dev, if (!status) { update_sensor_values(ec, ec->read_buffer); } - if (ACPI_FAILURE(acpi_release_mutex(ec->aml_mutex, NULL))) { - dev_err(dev, "Failed to release AML mutex"); - } -cleanup: + + if (!ec->lock_data.unlock(&ec->lock_data)) + dev_err(dev, "Failed to release mutex"); + return status; } @@ -651,6 +720,7 @@ static int __init asus_ec_probe(struct platform_device *pdev) enum hwmon_sensor_types type; struct device *hwdev; unsigned int i; + int status; pboard_info = get_board_info(); if (!pboard_info) @@ -667,6 +737,11 @@ static int __init asus_ec_probe(struct platform_device *pdev) ec_data->sensors = devm_kcalloc(dev, ec_data->nr_sensors, sizeof(struct ec_sensor), GFP_KERNEL); + status = setup_lock_data(dev); + if (status) { + dev_err(dev, "Failed to setup state/EC locking: %d", status); + return status; + } setup_sensor_data(ec_data); ec_data->registers = devm_kcalloc(dev, ec_data->nr_registers, sizeof(u16), GFP_KERNEL); @@ -678,8 +753,6 @@ static int __init asus_ec_probe(struct platform_device *pdev) fill_ec_registers(ec_data); - ec_data->aml_mutex = asus_hw_access_mutex(dev); - for (i = 0; i < ec_data->nr_sensors; ++i) { si = get_sensor_info(ec_data, i); if (!nr_count[si->type]) |