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Fix the acpi_thermal_add() error path that may do a double-free in some cases after recent changes (Dan Carpenter). -----BEGIN PGP SIGNATURE----- iQJGBAABCAAwFiEE4fcc61cGeeHD/fCwgsRv/nhiVHEFAmVFBpgSHHJqd0Byand5 c29ja2kubmV0AAoJEILEb/54YlRx7y4P/j8xXFy5HbP+Qd5qNGTNPhmdhpC0OB72 cqbWujNv0EK6OhryK54qI5gh4z7NoX7QBb6vmGPHNsKCtPdrOY/+IU1YfYAx6o6W 00jcDr08iPqr1CNxpwn+4OSCH6cJualQCAtD+7MGmFwh2OlH0GsohlZEeti0bzt7 +2uEK1M7zGP7K0UBGeNs/epynWlikmgDX8g6rxFbjtyyTdbWwvi7Vkq9WV+09MUj lMirq3Pmzc9kesoGEFJXSySugfGL1YWwDme8xOX9cjsIcX32KbcutbH7sMqBWiB9 nQePTF/S1gXbcQ+pXrO/KJnueOOkMgPBiqahAEVNSjfgd/KbscLaWAlMGfSzyvqo UCWu2jN2WdnRv7B+RS3SAVejTBR4OYjHAHkTRIk+0JvbzD4tNaVdbK0zp2zxVphh tNB2hbD3mJA5DMbqP9nbcUvkWoYcwLFUgTGKyAzp4fKSq7ct+80ove8D5eJOf94Z YLgiMDpPjLYxboPz5JiwNk70CHQkqiMF9hQVYHmHfAPO36lcoo8zcu5vnmJaKUAz HdrGksgs5quuYZfRYexaSB5995nr7E72g5HBkCCu4t0vTGoJ5fN8c8cepRGSWCKp WNmPR/DGrc4y1CcJo4MnPvAMvCcExhgbpD++rLBew5AD4q663bkzB9FPghqehHIr nFAtlS4l57WE =LLgE -----END PGP SIGNATURE----- Merge tag 'acpi-6.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI fix from Rafael Wysocki: "Fix the acpi_thermal_add() error path that may do a double-free in some cases after recent changes (Dan Carpenter)" * tag 'acpi-6.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI: thermal: Fix acpi_thermal_unregister_thermal_zone() cleanup
1147 lines
28 KiB
C
1147 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* This driver fully implements the ACPI thermal policy as described in the
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* ACPI 2.0 Specification.
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*
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* TBD: 1. Implement passive cooling hysteresis.
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* 2. Enhance passive cooling (CPU) states/limit interface to support
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* concepts of 'multiple limiters', upper/lower limits, etc.
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*/
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#define pr_fmt(fmt) "ACPI: thermal: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/jiffies.h>
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#include <linux/kmod.h>
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#include <linux/reboot.h>
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#include <linux/device.h>
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#include <linux/thermal.h>
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#include <linux/acpi.h>
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#include <linux/workqueue.h>
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#include <linux/uaccess.h>
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#include <linux/units.h>
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#define ACPI_THERMAL_CLASS "thermal_zone"
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#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
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#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
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#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
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#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
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#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
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#define ACPI_THERMAL_NOTIFY_HOT 0xF1
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#define ACPI_THERMAL_MODE_ACTIVE 0x00
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#define ACPI_THERMAL_MAX_ACTIVE 10
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#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
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#define ACPI_THERMAL_TRIP_PASSIVE (-1)
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/*
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* This exception is thrown out in two cases:
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* 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
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* when re-evaluating the AML code.
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* 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
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* We need to re-bind the cooling devices of a thermal zone when this occurs.
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*/
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#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
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do { \
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acpi_handle_info(tz->device->handle, \
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"ACPI thermal trip point %s changed\n" \
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"Please report to linux-acpi@vger.kernel.org\n", str); \
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} while (0)
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static int act;
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module_param(act, int, 0644);
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MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
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static int crt;
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module_param(crt, int, 0644);
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MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
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static int tzp;
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module_param(tzp, int, 0444);
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MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
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static int off;
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module_param(off, int, 0);
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MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
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static int psv;
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module_param(psv, int, 0644);
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MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
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static struct workqueue_struct *acpi_thermal_pm_queue;
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struct acpi_thermal_trip {
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unsigned long temp_dk;
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struct acpi_handle_list devices;
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};
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struct acpi_thermal_passive {
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struct acpi_thermal_trip trip;
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unsigned long tc1;
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unsigned long tc2;
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unsigned long tsp;
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};
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struct acpi_thermal_active {
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struct acpi_thermal_trip trip;
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};
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struct acpi_thermal_trips {
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struct acpi_thermal_passive passive;
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struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
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};
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struct acpi_thermal {
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struct acpi_device *device;
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acpi_bus_id name;
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unsigned long temp_dk;
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unsigned long last_temp_dk;
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unsigned long polling_frequency;
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volatile u8 zombie;
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struct acpi_thermal_trips trips;
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struct thermal_trip *trip_table;
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struct thermal_zone_device *thermal_zone;
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int kelvin_offset; /* in millidegrees */
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struct work_struct thermal_check_work;
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struct mutex thermal_check_lock;
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refcount_t thermal_check_count;
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};
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/* --------------------------------------------------------------------------
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Thermal Zone Management
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-------------------------------------------------------------------------- */
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static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
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{
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acpi_status status = AE_OK;
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unsigned long long tmp;
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if (!tz)
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return -EINVAL;
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tz->last_temp_dk = tz->temp_dk;
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status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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tz->temp_dk = tmp;
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acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
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tz->temp_dk);
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return 0;
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}
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static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
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{
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acpi_status status = AE_OK;
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unsigned long long tmp;
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if (!tz)
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return -EINVAL;
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status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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tz->polling_frequency = tmp;
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acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
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tz->polling_frequency);
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return 0;
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}
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static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
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{
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if (temp_deci_k == THERMAL_TEMP_INVALID)
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return THERMAL_TEMP_INVALID;
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return deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
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tz->kelvin_offset);
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}
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static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
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{
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return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
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}
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static int active_trip_index(struct acpi_thermal *tz,
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struct acpi_thermal_trip *acpi_trip)
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{
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struct acpi_thermal_active *active;
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active = container_of(acpi_trip, struct acpi_thermal_active, trip);
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return active - tz->trips.active;
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}
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static long get_passive_temp(struct acpi_thermal *tz)
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{
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unsigned long long tmp;
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acpi_status status;
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status = acpi_evaluate_integer(tz->device->handle, "_PSV", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return THERMAL_TEMP_INVALID;
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return tmp;
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}
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static long get_active_temp(struct acpi_thermal *tz, int index)
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{
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char method[] = { '_', 'A', 'C', '0' + index, '\0' };
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unsigned long long tmp;
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acpi_status status;
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status = acpi_evaluate_integer(tz->device->handle, method, NULL, &tmp);
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if (ACPI_FAILURE(status))
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return THERMAL_TEMP_INVALID;
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/*
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* If an override has been provided, apply it so there are no active
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* trips with thresholds greater than the override.
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*/
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if (act > 0) {
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unsigned long long override = celsius_to_deci_kelvin(act);
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if (tmp > override)
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tmp = override;
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}
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return tmp;
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}
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static void acpi_thermal_update_trip(struct acpi_thermal *tz,
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const struct thermal_trip *trip)
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{
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struct acpi_thermal_trip *acpi_trip = trip->priv;
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if (trip->type == THERMAL_TRIP_PASSIVE) {
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if (psv > 0)
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return;
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acpi_trip->temp_dk = get_passive_temp(tz);
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} else {
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int index = active_trip_index(tz, acpi_trip);
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acpi_trip->temp_dk = get_active_temp(tz, index);
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}
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if (!acpi_thermal_trip_valid(acpi_trip))
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ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
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}
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static bool update_trip_devices(struct acpi_thermal *tz,
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struct acpi_thermal_trip *acpi_trip,
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int index, bool compare)
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{
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struct acpi_handle_list devices = { 0 };
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char method[] = "_PSL";
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acpi_status status;
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if (index != ACPI_THERMAL_TRIP_PASSIVE) {
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method[1] = 'A';
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method[2] = 'L';
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method[3] = '0' + index;
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}
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status = acpi_evaluate_reference(tz->device->handle, method, NULL, &devices);
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if (ACPI_FAILURE(status)) {
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acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
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return false;
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}
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if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
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acpi_handle_list_free(&devices);
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return true;
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}
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if (compare)
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ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
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acpi_handle_list_replace(&acpi_trip->devices, &devices);
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return true;
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}
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static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
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const struct thermal_trip *trip)
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{
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struct acpi_thermal_trip *acpi_trip = trip->priv;
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int index = trip->type == THERMAL_TRIP_PASSIVE ?
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ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
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if (update_trip_devices(tz, acpi_trip, index, true))
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return;
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acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
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ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
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}
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struct adjust_trip_data {
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struct acpi_thermal *tz;
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u32 event;
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};
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static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
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{
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struct acpi_thermal_trip *acpi_trip = trip->priv;
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struct adjust_trip_data *atd = data;
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struct acpi_thermal *tz = atd->tz;
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if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
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return 0;
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if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
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acpi_thermal_update_trip(tz, trip);
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else
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acpi_thermal_update_trip_devices(tz, trip);
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if (acpi_thermal_trip_valid(acpi_trip))
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trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
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else
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trip->temperature = THERMAL_TEMP_INVALID;
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return 0;
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}
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static void acpi_queue_thermal_check(struct acpi_thermal *tz)
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{
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if (!work_pending(&tz->thermal_check_work))
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queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
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}
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static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
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{
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struct adjust_trip_data atd = { .tz = tz, .event = event };
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struct acpi_device *adev = tz->device;
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/*
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* Use thermal_zone_for_each_trip() to carry out the trip points
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* update, so as to protect thermal_get_trend() from getting stale
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* trip point temperatures and to prevent thermal_zone_device_update()
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* invoked from acpi_thermal_check_fn() from producing inconsistent
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* results.
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*/
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thermal_zone_for_each_trip(tz->thermal_zone,
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acpi_thermal_adjust_trip, &atd);
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acpi_queue_thermal_check(tz);
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acpi_bus_generate_netlink_event(adev->pnp.device_class,
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dev_name(&adev->dev), event, 0);
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}
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static long acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
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{
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unsigned long long tmp;
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acpi_status status;
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if (crt > 0) {
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tmp = celsius_to_deci_kelvin(crt);
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goto set;
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}
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if (crt == -1) {
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acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
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return THERMAL_TEMP_INVALID;
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}
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status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
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if (ACPI_FAILURE(status)) {
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acpi_handle_debug(tz->device->handle, "No critical threshold\n");
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return THERMAL_TEMP_INVALID;
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}
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if (tmp <= 2732) {
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/*
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* Below zero (Celsius) values clearly aren't right for sure,
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* so discard them as invalid.
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*/
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pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
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return THERMAL_TEMP_INVALID;
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}
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set:
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acpi_handle_debug(tz->device->handle, "Critical threshold [%llu]\n", tmp);
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return tmp;
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}
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static long acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
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{
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unsigned long long tmp;
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acpi_status status;
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status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
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if (ACPI_FAILURE(status)) {
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acpi_handle_debug(tz->device->handle, "No hot threshold\n");
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return THERMAL_TEMP_INVALID;
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}
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acpi_handle_debug(tz->device->handle, "Hot threshold [%llu]\n", tmp);
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return tmp;
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}
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static bool passive_trip_params_init(struct acpi_thermal *tz)
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{
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unsigned long long tmp;
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acpi_status status;
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status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return false;
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tz->trips.passive.tc1 = tmp;
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status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return false;
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tz->trips.passive.tc2 = tmp;
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status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return false;
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tz->trips.passive.tsp = tmp;
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return true;
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}
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static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
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{
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struct acpi_thermal_trip *acpi_trip;
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long temp;
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|
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if (index == ACPI_THERMAL_TRIP_PASSIVE) {
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acpi_trip = &tz->trips.passive.trip;
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|
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if (psv == -1)
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goto fail;
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|
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if (!passive_trip_params_init(tz))
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goto fail;
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temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
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get_passive_temp(tz);
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} else {
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acpi_trip = &tz->trips.active[index].trip;
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if (act == -1)
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goto fail;
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|
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temp = get_active_temp(tz, index);
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}
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|
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if (temp == THERMAL_TEMP_INVALID)
|
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goto fail;
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|
|
|
if (!update_trip_devices(tz, acpi_trip, index, false))
|
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goto fail;
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|
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acpi_trip->temp_dk = temp;
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return true;
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|
|
fail:
|
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acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
|
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return false;
|
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}
|
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|
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static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
|
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{
|
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unsigned int count = 0;
|
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int i;
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|
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if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE))
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count++;
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|
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for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
|
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if (acpi_thermal_init_trip(tz, i))
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count++;
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else
|
|
break;
|
|
|
|
}
|
|
|
|
while (++i < ACPI_THERMAL_MAX_ACTIVE)
|
|
tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
|
|
|
|
return count;
|
|
}
|
|
|
|
/* sys I/F for generic thermal sysfs support */
|
|
|
|
static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
|
|
{
|
|
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
|
|
int result;
|
|
|
|
if (!tz)
|
|
return -EINVAL;
|
|
|
|
result = acpi_thermal_get_temperature(tz);
|
|
if (result)
|
|
return result;
|
|
|
|
*temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
|
|
tz->kelvin_offset);
|
|
return 0;
|
|
}
|
|
|
|
static int thermal_get_trend(struct thermal_zone_device *thermal,
|
|
const struct thermal_trip *trip,
|
|
enum thermal_trend *trend)
|
|
{
|
|
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
|
|
struct acpi_thermal_trip *acpi_trip;
|
|
int t;
|
|
|
|
if (!tz || !trip)
|
|
return -EINVAL;
|
|
|
|
acpi_trip = trip->priv;
|
|
if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
|
|
return -EINVAL;
|
|
|
|
switch (trip->type) {
|
|
case THERMAL_TRIP_PASSIVE:
|
|
t = tz->trips.passive.tc1 * (tz->temp_dk -
|
|
tz->last_temp_dk) +
|
|
tz->trips.passive.tc2 * (tz->temp_dk -
|
|
acpi_trip->temp_dk);
|
|
if (t > 0)
|
|
*trend = THERMAL_TREND_RAISING;
|
|
else if (t < 0)
|
|
*trend = THERMAL_TREND_DROPPING;
|
|
else
|
|
*trend = THERMAL_TREND_STABLE;
|
|
|
|
return 0;
|
|
|
|
case THERMAL_TRIP_ACTIVE:
|
|
t = acpi_thermal_temp(tz, tz->temp_dk);
|
|
if (t <= trip->temperature)
|
|
break;
|
|
|
|
*trend = THERMAL_TREND_RAISING;
|
|
|
|
return 0;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
|
|
{
|
|
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
|
|
|
|
acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
|
|
dev_name(&tz->device->dev),
|
|
ACPI_THERMAL_NOTIFY_HOT, 1);
|
|
}
|
|
|
|
static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
|
|
{
|
|
struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
|
|
|
|
acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
|
|
dev_name(&tz->device->dev),
|
|
ACPI_THERMAL_NOTIFY_CRITICAL, 1);
|
|
|
|
thermal_zone_device_critical(thermal);
|
|
}
|
|
|
|
struct acpi_thermal_bind_data {
|
|
struct thermal_zone_device *thermal;
|
|
struct thermal_cooling_device *cdev;
|
|
bool bind;
|
|
};
|
|
|
|
static int bind_unbind_cdev_cb(struct thermal_trip *trip, void *arg)
|
|
{
|
|
struct acpi_thermal_trip *acpi_trip = trip->priv;
|
|
struct acpi_thermal_bind_data *bd = arg;
|
|
struct thermal_zone_device *thermal = bd->thermal;
|
|
struct thermal_cooling_device *cdev = bd->cdev;
|
|
struct acpi_device *cdev_adev = cdev->devdata;
|
|
int i;
|
|
|
|
/* Skip critical and hot trips. */
|
|
if (!acpi_trip)
|
|
return 0;
|
|
|
|
for (i = 0; i < acpi_trip->devices.count; i++) {
|
|
acpi_handle handle = acpi_trip->devices.handles[i];
|
|
struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
|
|
|
|
if (adev != cdev_adev)
|
|
continue;
|
|
|
|
if (bd->bind) {
|
|
int ret;
|
|
|
|
ret = thermal_bind_cdev_to_trip(thermal, trip, cdev,
|
|
THERMAL_NO_LIMIT,
|
|
THERMAL_NO_LIMIT,
|
|
THERMAL_WEIGHT_DEFAULT);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
thermal_unbind_cdev_from_trip(thermal, trip, cdev);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_thermal_bind_unbind_cdev(struct thermal_zone_device *thermal,
|
|
struct thermal_cooling_device *cdev,
|
|
bool bind)
|
|
{
|
|
struct acpi_thermal_bind_data bd = {
|
|
.thermal = thermal, .cdev = cdev, .bind = bind
|
|
};
|
|
|
|
return for_each_thermal_trip(thermal, bind_unbind_cdev_cb, &bd);
|
|
}
|
|
|
|
static int
|
|
acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
return acpi_thermal_bind_unbind_cdev(thermal, cdev, true);
|
|
}
|
|
|
|
static int
|
|
acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
return acpi_thermal_bind_unbind_cdev(thermal, cdev, false);
|
|
}
|
|
|
|
static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
|
|
.bind = acpi_thermal_bind_cooling_device,
|
|
.unbind = acpi_thermal_unbind_cooling_device,
|
|
.get_temp = thermal_get_temp,
|
|
.get_trend = thermal_get_trend,
|
|
.hot = acpi_thermal_zone_device_hot,
|
|
.critical = acpi_thermal_zone_device_critical,
|
|
};
|
|
|
|
static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
|
|
{
|
|
struct device *tzdev = thermal_zone_device(tz->thermal_zone);
|
|
int ret;
|
|
|
|
ret = sysfs_create_link(&tz->device->dev.kobj,
|
|
&tzdev->kobj, "thermal_zone");
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = sysfs_create_link(&tzdev->kobj,
|
|
&tz->device->dev.kobj, "device");
|
|
if (ret)
|
|
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
|
|
{
|
|
struct device *tzdev = thermal_zone_device(tz->thermal_zone);
|
|
|
|
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
|
|
sysfs_remove_link(&tzdev->kobj, "device");
|
|
}
|
|
|
|
static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
|
|
unsigned int trip_count,
|
|
int passive_delay)
|
|
{
|
|
int result;
|
|
|
|
tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
|
|
tz->trip_table,
|
|
trip_count,
|
|
0, tz,
|
|
&acpi_thermal_zone_ops,
|
|
NULL,
|
|
passive_delay,
|
|
tz->polling_frequency * 100);
|
|
if (IS_ERR(tz->thermal_zone))
|
|
return PTR_ERR(tz->thermal_zone);
|
|
|
|
result = acpi_thermal_zone_sysfs_add(tz);
|
|
if (result)
|
|
goto unregister_tzd;
|
|
|
|
result = thermal_zone_device_enable(tz->thermal_zone);
|
|
if (result)
|
|
goto remove_links;
|
|
|
|
dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
|
|
thermal_zone_device_id(tz->thermal_zone));
|
|
|
|
return 0;
|
|
|
|
remove_links:
|
|
acpi_thermal_zone_sysfs_remove(tz);
|
|
unregister_tzd:
|
|
thermal_zone_device_unregister(tz->thermal_zone);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
|
|
{
|
|
thermal_zone_device_disable(tz->thermal_zone);
|
|
acpi_thermal_zone_sysfs_remove(tz);
|
|
thermal_zone_device_unregister(tz->thermal_zone);
|
|
tz->thermal_zone = NULL;
|
|
}
|
|
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Driver Interface
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
|
|
{
|
|
struct acpi_device *device = data;
|
|
struct acpi_thermal *tz = acpi_driver_data(device);
|
|
|
|
if (!tz)
|
|
return;
|
|
|
|
switch (event) {
|
|
case ACPI_THERMAL_NOTIFY_TEMPERATURE:
|
|
acpi_queue_thermal_check(tz);
|
|
break;
|
|
case ACPI_THERMAL_NOTIFY_THRESHOLDS:
|
|
case ACPI_THERMAL_NOTIFY_DEVICES:
|
|
acpi_thermal_trips_update(tz, event);
|
|
break;
|
|
default:
|
|
acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
|
|
event);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* On some platforms, the AML code has dependency about
|
|
* the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
|
|
* 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
|
|
* /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
|
|
* 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
|
|
* if _TMP has never been evaluated.
|
|
*
|
|
* As this dependency is totally transparent to OS, evaluate
|
|
* all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
|
|
* _TMP, before they are actually used.
|
|
*/
|
|
static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
|
|
{
|
|
acpi_handle handle = tz->device->handle;
|
|
unsigned long long value;
|
|
int i;
|
|
|
|
acpi_evaluate_integer(handle, "_CRT", NULL, &value);
|
|
acpi_evaluate_integer(handle, "_HOT", NULL, &value);
|
|
acpi_evaluate_integer(handle, "_PSV", NULL, &value);
|
|
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
|
|
char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(handle, name, NULL, &value);
|
|
if (status == AE_NOT_FOUND)
|
|
break;
|
|
}
|
|
acpi_evaluate_integer(handle, "_TMP", NULL, &value);
|
|
}
|
|
|
|
/*
|
|
* The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
|
|
* handles temperature values with a single decimal place. As a consequence,
|
|
* some implementations use an offset of 273.1 and others use an offset of
|
|
* 273.2. Try to find out which one is being used, to present the most
|
|
* accurate and visually appealing number.
|
|
*
|
|
* The heuristic below should work for all ACPI thermal zones which have a
|
|
* critical trip point with a value being a multiple of 0.5 degree Celsius.
|
|
*/
|
|
static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
|
|
{
|
|
if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
|
|
tz->kelvin_offset = 273100;
|
|
else
|
|
tz->kelvin_offset = 273200;
|
|
}
|
|
|
|
static void acpi_thermal_check_fn(struct work_struct *work)
|
|
{
|
|
struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
|
|
thermal_check_work);
|
|
|
|
/*
|
|
* In general, it is not sufficient to check the pending bit, because
|
|
* subsequent instances of this function may be queued after one of them
|
|
* has started running (e.g. if _TMP sleeps). Avoid bailing out if just
|
|
* one of them is running, though, because it may have done the actual
|
|
* check some time ago, so allow at least one of them to block on the
|
|
* mutex while another one is running the update.
|
|
*/
|
|
if (!refcount_dec_not_one(&tz->thermal_check_count))
|
|
return;
|
|
|
|
mutex_lock(&tz->thermal_check_lock);
|
|
|
|
thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
refcount_inc(&tz->thermal_check_count);
|
|
|
|
mutex_unlock(&tz->thermal_check_lock);
|
|
}
|
|
|
|
static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
|
|
{
|
|
int i;
|
|
|
|
acpi_handle_list_free(&tz->trips.passive.trip.devices);
|
|
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
|
|
acpi_handle_list_free(&tz->trips.active[i].trip.devices);
|
|
|
|
kfree(tz);
|
|
}
|
|
|
|
static int acpi_thermal_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_thermal_trip *acpi_trip;
|
|
struct thermal_trip *trip;
|
|
struct acpi_thermal *tz;
|
|
unsigned int trip_count;
|
|
int crit_temp, hot_temp;
|
|
int passive_delay = 0;
|
|
int result;
|
|
int i;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
|
|
if (!tz)
|
|
return -ENOMEM;
|
|
|
|
tz->device = device;
|
|
strcpy(tz->name, device->pnp.bus_id);
|
|
strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
|
|
device->driver_data = tz;
|
|
|
|
acpi_thermal_aml_dependency_fix(tz);
|
|
|
|
/* Get trip points [_CRT, _PSV, etc.] (required). */
|
|
trip_count = acpi_thermal_get_trip_points(tz);
|
|
|
|
crit_temp = acpi_thermal_get_critical_trip(tz);
|
|
if (crit_temp != THERMAL_TEMP_INVALID)
|
|
trip_count++;
|
|
|
|
hot_temp = acpi_thermal_get_hot_trip(tz);
|
|
if (hot_temp != THERMAL_TEMP_INVALID)
|
|
trip_count++;
|
|
|
|
if (!trip_count) {
|
|
pr_warn(FW_BUG "No valid trip points!\n");
|
|
result = -ENODEV;
|
|
goto free_memory;
|
|
}
|
|
|
|
/* Get temperature [_TMP] (required). */
|
|
result = acpi_thermal_get_temperature(tz);
|
|
if (result)
|
|
goto free_memory;
|
|
|
|
/* Set the cooling mode [_SCP] to active cooling. */
|
|
acpi_execute_simple_method(tz->device->handle, "_SCP",
|
|
ACPI_THERMAL_MODE_ACTIVE);
|
|
|
|
/* Determine the default polling frequency [_TZP]. */
|
|
if (tzp)
|
|
tz->polling_frequency = tzp;
|
|
else
|
|
acpi_thermal_get_polling_frequency(tz);
|
|
|
|
acpi_thermal_guess_offset(tz, crit_temp);
|
|
|
|
trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL);
|
|
if (!trip) {
|
|
result = -ENOMEM;
|
|
goto free_memory;
|
|
}
|
|
|
|
tz->trip_table = trip;
|
|
|
|
if (crit_temp != THERMAL_TEMP_INVALID) {
|
|
trip->type = THERMAL_TRIP_CRITICAL;
|
|
trip->temperature = acpi_thermal_temp(tz, crit_temp);
|
|
trip++;
|
|
}
|
|
|
|
if (hot_temp != THERMAL_TEMP_INVALID) {
|
|
trip->type = THERMAL_TRIP_HOT;
|
|
trip->temperature = acpi_thermal_temp(tz, hot_temp);
|
|
trip++;
|
|
}
|
|
|
|
acpi_trip = &tz->trips.passive.trip;
|
|
if (acpi_thermal_trip_valid(acpi_trip)) {
|
|
passive_delay = tz->trips.passive.tsp * 100;
|
|
|
|
trip->type = THERMAL_TRIP_PASSIVE;
|
|
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
|
|
trip->priv = acpi_trip;
|
|
trip++;
|
|
}
|
|
|
|
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
|
|
acpi_trip = &tz->trips.active[i].trip;
|
|
|
|
if (!acpi_thermal_trip_valid(acpi_trip))
|
|
break;
|
|
|
|
trip->type = THERMAL_TRIP_ACTIVE;
|
|
trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
|
|
trip->priv = acpi_trip;
|
|
trip++;
|
|
}
|
|
|
|
result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay);
|
|
if (result)
|
|
goto free_trips;
|
|
|
|
refcount_set(&tz->thermal_check_count, 3);
|
|
mutex_init(&tz->thermal_check_lock);
|
|
INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
|
|
|
|
pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
|
|
acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
|
|
|
|
result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
|
|
acpi_thermal_notify, device);
|
|
if (result)
|
|
goto flush_wq;
|
|
|
|
return 0;
|
|
|
|
flush_wq:
|
|
flush_workqueue(acpi_thermal_pm_queue);
|
|
acpi_thermal_unregister_thermal_zone(tz);
|
|
free_trips:
|
|
kfree(tz->trip_table);
|
|
free_memory:
|
|
acpi_thermal_free_thermal_zone(tz);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void acpi_thermal_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_thermal *tz;
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return;
|
|
|
|
tz = acpi_driver_data(device);
|
|
|
|
acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
|
|
acpi_thermal_notify);
|
|
|
|
flush_workqueue(acpi_thermal_pm_queue);
|
|
acpi_thermal_unregister_thermal_zone(tz);
|
|
kfree(tz->trip_table);
|
|
acpi_thermal_free_thermal_zone(tz);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int acpi_thermal_suspend(struct device *dev)
|
|
{
|
|
/* Make sure the previously queued thermal check work has been done */
|
|
flush_workqueue(acpi_thermal_pm_queue);
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_thermal_resume(struct device *dev)
|
|
{
|
|
struct acpi_thermal *tz;
|
|
int i, j, power_state;
|
|
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
tz = acpi_driver_data(to_acpi_device(dev));
|
|
if (!tz)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
|
|
struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
|
|
|
|
if (!acpi_thermal_trip_valid(acpi_trip))
|
|
break;
|
|
|
|
for (j = 0; j < acpi_trip->devices.count; j++) {
|
|
acpi_bus_update_power(acpi_trip->devices.handles[j],
|
|
&power_state);
|
|
}
|
|
}
|
|
|
|
acpi_queue_thermal_check(tz);
|
|
|
|
return AE_OK;
|
|
}
|
|
#else
|
|
#define acpi_thermal_suspend NULL
|
|
#define acpi_thermal_resume NULL
|
|
#endif
|
|
static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
|
|
|
|
static const struct acpi_device_id thermal_device_ids[] = {
|
|
{ACPI_THERMAL_HID, 0},
|
|
{"", 0},
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
|
|
|
|
static struct acpi_driver acpi_thermal_driver = {
|
|
.name = "thermal",
|
|
.class = ACPI_THERMAL_CLASS,
|
|
.ids = thermal_device_ids,
|
|
.ops = {
|
|
.add = acpi_thermal_add,
|
|
.remove = acpi_thermal_remove,
|
|
},
|
|
.drv.pm = &acpi_thermal_pm,
|
|
};
|
|
|
|
static int thermal_act(const struct dmi_system_id *d)
|
|
{
|
|
if (act == 0) {
|
|
pr_notice("%s detected: disabling all active thermal trip points\n",
|
|
d->ident);
|
|
act = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int thermal_nocrt(const struct dmi_system_id *d)
|
|
{
|
|
pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
|
|
d->ident);
|
|
crt = -1;
|
|
return 0;
|
|
}
|
|
|
|
static int thermal_tzp(const struct dmi_system_id *d)
|
|
{
|
|
if (tzp == 0) {
|
|
pr_notice("%s detected: enabling thermal zone polling\n",
|
|
d->ident);
|
|
tzp = 300; /* 300 dS = 30 Seconds */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int thermal_psv(const struct dmi_system_id *d)
|
|
{
|
|
if (psv == 0) {
|
|
pr_notice("%s detected: disabling all passive thermal trip points\n",
|
|
d->ident);
|
|
psv = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct dmi_system_id thermal_dmi_table[] __initconst = {
|
|
/*
|
|
* Award BIOS on this AOpen makes thermal control almost worthless.
|
|
* http://bugzilla.kernel.org/show_bug.cgi?id=8842
|
|
*/
|
|
{
|
|
.callback = thermal_act,
|
|
.ident = "AOpen i915GMm-HFS",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
|
|
},
|
|
},
|
|
{
|
|
.callback = thermal_psv,
|
|
.ident = "AOpen i915GMm-HFS",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
|
|
},
|
|
},
|
|
{
|
|
.callback = thermal_tzp,
|
|
.ident = "AOpen i915GMm-HFS",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
|
|
},
|
|
},
|
|
{
|
|
.callback = thermal_nocrt,
|
|
.ident = "Gigabyte GA-7ZX",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
|
|
DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
|
|
},
|
|
},
|
|
{}
|
|
};
|
|
|
|
static int __init acpi_thermal_init(void)
|
|
{
|
|
int result;
|
|
|
|
dmi_check_system(thermal_dmi_table);
|
|
|
|
if (off) {
|
|
pr_notice("thermal control disabled\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
|
|
WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
|
|
if (!acpi_thermal_pm_queue)
|
|
return -ENODEV;
|
|
|
|
result = acpi_bus_register_driver(&acpi_thermal_driver);
|
|
if (result < 0) {
|
|
destroy_workqueue(acpi_thermal_pm_queue);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acpi_thermal_exit(void)
|
|
{
|
|
acpi_bus_unregister_driver(&acpi_thermal_driver);
|
|
destroy_workqueue(acpi_thermal_pm_queue);
|
|
}
|
|
|
|
module_init(acpi_thermal_init);
|
|
module_exit(acpi_thermal_exit);
|
|
|
|
MODULE_AUTHOR("Paul Diefenbaugh");
|
|
MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
|
|
MODULE_LICENSE("GPL");
|