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![Guenter Roeck](/assets/img/avatar_default.png)
Damien Le Moal reports a lockdep splat with the acpi_power_meter, observed with Linux v5.5 and later. ====================================================== WARNING: possible circular locking dependency detected 5.6.0-rc2+ #629 Not tainted ------------------------------------------------------ python/1397 is trying to acquire lock: ffff888619080070 (&resource->lock){+.+.}, at: show_power+0x3c/0xa0 [acpi_power_meter] but task is already holding lock: ffff88881643f188 (kn->count#119){++++}, at: kernfs_seq_start+0x6a/0x160 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (kn->count#119){++++}: __kernfs_remove+0x626/0x7e0 kernfs_remove_by_name_ns+0x41/0x80 remove_attrs+0xcb/0x3c0 [acpi_power_meter] acpi_power_meter_notify+0x1f7/0x310 [acpi_power_meter] acpi_ev_notify_dispatch+0x198/0x1f3 acpi_os_execute_deferred+0x4d/0x70 process_one_work+0x7c8/0x1340 worker_thread+0x94/0xc70 kthread+0x2ed/0x3f0 ret_from_fork+0x24/0x30 -> #0 (&resource->lock){+.+.}: __lock_acquire+0x20be/0x49b0 lock_acquire+0x127/0x340 __mutex_lock+0x15b/0x1350 show_power+0x3c/0xa0 [acpi_power_meter] dev_attr_show+0x3f/0x80 sysfs_kf_seq_show+0x216/0x410 seq_read+0x407/0xf90 vfs_read+0x152/0x2c0 ksys_read+0xf3/0x1d0 do_syscall_64+0x95/0x1010 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(kn->count#119); lock(&resource->lock); lock(kn->count#119); lock(&resource->lock); *** DEADLOCK *** 4 locks held by python/1397: #0: ffff8890242d64e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x9b/0xb0 #1: ffff889040be74e0 (&p->lock){+.+.}, at: seq_read+0x6b/0xf90 #2: ffff8890448eb880 (&of->mutex){+.+.}, at: kernfs_seq_start+0x47/0x160 #3: ffff88881643f188 (kn->count#119){++++}, at: kernfs_seq_start+0x6a/0x160 stack backtrace: CPU: 10 PID: 1397 Comm: python Not tainted 5.6.0-rc2+ #629 Hardware name: Supermicro Super Server/X11DPL-i, BIOS 3.1 05/21/2019 Call Trace: dump_stack+0x97/0xe0 check_noncircular+0x32e/0x3e0 ? print_circular_bug.isra.0+0x1e0/0x1e0 ? unwind_next_frame+0xb9a/0x1890 ? entry_SYSCALL_64_after_hwframe+0x49/0xbe ? graph_lock+0x79/0x170 ? __lockdep_reset_lock+0x3c0/0x3c0 ? mark_lock+0xbc/0x1150 __lock_acquire+0x20be/0x49b0 ? mark_held_locks+0xe0/0xe0 ? stack_trace_save+0x91/0xc0 lock_acquire+0x127/0x340 ? show_power+0x3c/0xa0 [acpi_power_meter] ? device_remove_bin_file+0x10/0x10 ? device_remove_bin_file+0x10/0x10 __mutex_lock+0x15b/0x1350 ? show_power+0x3c/0xa0 [acpi_power_meter] ? show_power+0x3c/0xa0 [acpi_power_meter] ? mutex_lock_io_nested+0x11f0/0x11f0 ? lock_downgrade+0x6a0/0x6a0 ? kernfs_seq_start+0x47/0x160 ? lock_acquire+0x127/0x340 ? kernfs_seq_start+0x6a/0x160 ? device_remove_bin_file+0x10/0x10 ? show_power+0x3c/0xa0 [acpi_power_meter] show_power+0x3c/0xa0 [acpi_power_meter] dev_attr_show+0x3f/0x80 ? memset+0x20/0x40 sysfs_kf_seq_show+0x216/0x410 seq_read+0x407/0xf90 ? security_file_permission+0x16f/0x2c0 vfs_read+0x152/0x2c0 Problem is that reading an attribute takes the kernfs lock in the kernfs code, then resource->lock in the driver. During an ACPI notification, the opposite happens: The resource lock is taken first, followed by the kernfs lock when sysfs attributes are removed and re-created. Presumably this is now seen due to some locking related changes in kernfs after v5.4, but it was likely always a problem. Fix the problem by not blindly acquiring the lock in the notification function. It is only needed to protect the various update functions. However, those update functions are called anyway when sysfs attributes are read. This means that we can just stop calling those functions from the notifier, and the resource lock in the notifier function is no longer needed. That leaves two situations: First, METER_NOTIFY_CONFIG removes and re-allocates capability strings. While it did so under the resource lock, _displaying_ those strings was not protected, creating a race condition. To solve this problem, selectively protect both removal/creation and reporting of capability attributes with the resource lock. Second, removing and re-creating the attribute files is no longer protected by the resource lock. That doesn't matter since access to each individual attribute is protected by the kernfs lock. Userspace may get messed up if attributes disappear and reappear under its nose, but that is not different than today, and there is nothing we can do about it without major driver restructuring. Last but not least, when removing the driver, remove attribute functions first, then release capability strings. This avoids yet another race condition. Reported-by: Damien Le Moal <Damien.LeMoal@wdc.com> Cc: Damien Le Moal <Damien.LeMoal@wdc.com> Cc: stable@vger.kernel.org # v5.5+ Tested-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
1003 lines
23 KiB
C
1003 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* A hwmon driver for ACPI 4.0 power meters
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* Copyright (C) 2009 IBM
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#include <linux/module.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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#include <linux/mutex.h>
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#include <linux/dmi.h>
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#include <linux/slab.h>
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#include <linux/kdev_t.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/err.h>
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#include <linux/acpi.h>
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#define ACPI_POWER_METER_NAME "power_meter"
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ACPI_MODULE_NAME(ACPI_POWER_METER_NAME);
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#define ACPI_POWER_METER_DEVICE_NAME "Power Meter"
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#define ACPI_POWER_METER_CLASS "pwr_meter_resource"
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#define NUM_SENSORS 17
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#define POWER_METER_CAN_MEASURE (1 << 0)
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#define POWER_METER_CAN_TRIP (1 << 1)
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#define POWER_METER_CAN_CAP (1 << 2)
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#define POWER_METER_CAN_NOTIFY (1 << 3)
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#define POWER_METER_IS_BATTERY (1 << 8)
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#define UNKNOWN_HYSTERESIS 0xFFFFFFFF
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#define METER_NOTIFY_CONFIG 0x80
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#define METER_NOTIFY_TRIP 0x81
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#define METER_NOTIFY_CAP 0x82
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#define METER_NOTIFY_CAPPING 0x83
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#define METER_NOTIFY_INTERVAL 0x84
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#define POWER_AVERAGE_NAME "power1_average"
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#define POWER_CAP_NAME "power1_cap"
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#define POWER_AVG_INTERVAL_NAME "power1_average_interval"
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#define POWER_ALARM_NAME "power1_alarm"
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static int cap_in_hardware;
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static bool force_cap_on;
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static int can_cap_in_hardware(void)
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{
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return force_cap_on || cap_in_hardware;
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}
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static const struct acpi_device_id power_meter_ids[] = {
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{"ACPI000D", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, power_meter_ids);
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struct acpi_power_meter_capabilities {
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u64 flags;
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u64 units;
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u64 type;
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u64 accuracy;
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u64 sampling_time;
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u64 min_avg_interval;
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u64 max_avg_interval;
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u64 hysteresis;
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u64 configurable_cap;
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u64 min_cap;
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u64 max_cap;
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};
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struct acpi_power_meter_resource {
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struct acpi_device *acpi_dev;
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acpi_bus_id name;
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struct mutex lock;
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struct device *hwmon_dev;
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struct acpi_power_meter_capabilities caps;
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acpi_string model_number;
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acpi_string serial_number;
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acpi_string oem_info;
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u64 power;
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u64 cap;
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u64 avg_interval;
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int sensors_valid;
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unsigned long sensors_last_updated;
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struct sensor_device_attribute sensors[NUM_SENSORS];
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int num_sensors;
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s64 trip[2];
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int num_domain_devices;
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struct acpi_device **domain_devices;
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struct kobject *holders_dir;
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};
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struct sensor_template {
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char *label;
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ssize_t (*show)(struct device *dev,
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struct device_attribute *devattr,
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char *buf);
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ssize_t (*set)(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count);
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int index;
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};
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/* Averaging interval */
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static int update_avg_interval(struct acpi_power_meter_resource *resource)
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{
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unsigned long long data;
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acpi_status status;
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
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NULL, &data);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI"));
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return -ENODEV;
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}
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resource->avg_interval = data;
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return 0;
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}
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static ssize_t show_avg_interval(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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mutex_lock(&resource->lock);
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update_avg_interval(resource);
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mutex_unlock(&resource->lock);
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return sprintf(buf, "%llu\n", resource->avg_interval);
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}
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static ssize_t set_avg_interval(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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union acpi_object arg0 = { ACPI_TYPE_INTEGER };
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struct acpi_object_list args = { 1, &arg0 };
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int res;
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unsigned long temp;
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unsigned long long data;
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acpi_status status;
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res = kstrtoul(buf, 10, &temp);
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if (res)
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return res;
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if (temp > resource->caps.max_avg_interval ||
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temp < resource->caps.min_avg_interval)
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return -EINVAL;
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arg0.integer.value = temp;
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mutex_lock(&resource->lock);
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
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&args, &data);
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if (!ACPI_FAILURE(status))
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resource->avg_interval = temp;
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mutex_unlock(&resource->lock);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
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return -EINVAL;
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}
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/* _PAI returns 0 on success, nonzero otherwise */
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if (data)
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return -EINVAL;
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return count;
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}
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/* Cap functions */
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static int update_cap(struct acpi_power_meter_resource *resource)
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{
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unsigned long long data;
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acpi_status status;
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
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NULL, &data);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL"));
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return -ENODEV;
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}
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resource->cap = data;
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return 0;
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}
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static ssize_t show_cap(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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mutex_lock(&resource->lock);
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update_cap(resource);
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mutex_unlock(&resource->lock);
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return sprintf(buf, "%llu\n", resource->cap * 1000);
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}
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static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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union acpi_object arg0 = { ACPI_TYPE_INTEGER };
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struct acpi_object_list args = { 1, &arg0 };
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int res;
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unsigned long temp;
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unsigned long long data;
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acpi_status status;
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res = kstrtoul(buf, 10, &temp);
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if (res)
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return res;
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temp = DIV_ROUND_CLOSEST(temp, 1000);
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if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
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return -EINVAL;
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arg0.integer.value = temp;
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mutex_lock(&resource->lock);
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
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&args, &data);
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if (!ACPI_FAILURE(status))
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resource->cap = temp;
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mutex_unlock(&resource->lock);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
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return -EINVAL;
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}
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/* _SHL returns 0 on success, nonzero otherwise */
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if (data)
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return -EINVAL;
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return count;
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}
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/* Power meter trip points */
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static int set_acpi_trip(struct acpi_power_meter_resource *resource)
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{
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union acpi_object arg_objs[] = {
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{ACPI_TYPE_INTEGER},
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{ACPI_TYPE_INTEGER}
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};
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struct acpi_object_list args = { 2, arg_objs };
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unsigned long long data;
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acpi_status status;
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/* Both trip levels must be set */
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if (resource->trip[0] < 0 || resource->trip[1] < 0)
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return 0;
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/* This driver stores min, max; ACPI wants max, min. */
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arg_objs[0].integer.value = resource->trip[1];
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arg_objs[1].integer.value = resource->trip[0];
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
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&args, &data);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP"));
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return -EINVAL;
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}
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/* _PTP returns 0 on success, nonzero otherwise */
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if (data)
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return -EINVAL;
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return 0;
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}
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static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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int res;
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unsigned long temp;
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res = kstrtoul(buf, 10, &temp);
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if (res)
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return res;
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temp = DIV_ROUND_CLOSEST(temp, 1000);
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mutex_lock(&resource->lock);
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resource->trip[attr->index - 7] = temp;
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res = set_acpi_trip(resource);
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mutex_unlock(&resource->lock);
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if (res)
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return res;
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return count;
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}
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/* Power meter */
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static int update_meter(struct acpi_power_meter_resource *resource)
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{
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unsigned long long data;
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acpi_status status;
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unsigned long local_jiffies = jiffies;
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if (time_before(local_jiffies, resource->sensors_last_updated +
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msecs_to_jiffies(resource->caps.sampling_time)) &&
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resource->sensors_valid)
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return 0;
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status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
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NULL, &data);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
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return -ENODEV;
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}
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resource->power = data;
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resource->sensors_valid = 1;
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resource->sensors_last_updated = jiffies;
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return 0;
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}
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static ssize_t show_power(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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mutex_lock(&resource->lock);
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update_meter(resource);
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mutex_unlock(&resource->lock);
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return sprintf(buf, "%llu\n", resource->power * 1000);
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}
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/* Miscellaneous */
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static ssize_t show_str(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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acpi_string val;
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int ret;
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mutex_lock(&resource->lock);
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switch (attr->index) {
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case 0:
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val = resource->model_number;
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break;
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case 1:
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val = resource->serial_number;
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break;
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case 2:
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val = resource->oem_info;
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break;
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default:
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WARN(1, "Implementation error: unexpected attribute index %d\n",
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attr->index);
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val = "";
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break;
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}
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ret = sprintf(buf, "%s\n", val);
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mutex_unlock(&resource->lock);
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return ret;
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}
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static ssize_t show_val(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
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u64 val = 0;
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switch (attr->index) {
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case 0:
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val = resource->caps.min_avg_interval;
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break;
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case 1:
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val = resource->caps.max_avg_interval;
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break;
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case 2:
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val = resource->caps.min_cap * 1000;
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break;
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case 3:
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val = resource->caps.max_cap * 1000;
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break;
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case 4:
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if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
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return sprintf(buf, "unknown\n");
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val = resource->caps.hysteresis * 1000;
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break;
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case 5:
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if (resource->caps.flags & POWER_METER_IS_BATTERY)
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val = 1;
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else
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val = 0;
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break;
|
|
case 6:
|
|
if (resource->power > resource->cap)
|
|
val = 1;
|
|
else
|
|
val = 0;
|
|
break;
|
|
case 7:
|
|
case 8:
|
|
if (resource->trip[attr->index - 7] < 0)
|
|
return sprintf(buf, "unknown\n");
|
|
|
|
val = resource->trip[attr->index - 7] * 1000;
|
|
break;
|
|
default:
|
|
WARN(1, "Implementation error: unexpected attribute index %d\n",
|
|
attr->index);
|
|
break;
|
|
}
|
|
|
|
return sprintf(buf, "%llu\n", val);
|
|
}
|
|
|
|
static ssize_t show_accuracy(struct device *dev,
|
|
struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
struct acpi_device *acpi_dev = to_acpi_device(dev);
|
|
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
|
|
unsigned int acc = resource->caps.accuracy;
|
|
|
|
return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
|
|
}
|
|
|
|
static ssize_t show_name(struct device *dev,
|
|
struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
|
|
}
|
|
|
|
#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
|
|
{ \
|
|
.label = _label, \
|
|
.show = _show, \
|
|
.index = _index, \
|
|
}
|
|
|
|
#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
|
|
{ \
|
|
.label = _label, \
|
|
.show = _show, \
|
|
.set = _set, \
|
|
.index = _index, \
|
|
}
|
|
|
|
/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
|
|
static struct sensor_template meter_attrs[] = {
|
|
RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
|
|
RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
|
|
RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
|
|
RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
|
|
RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
|
|
RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
|
|
set_avg_interval, 0),
|
|
{},
|
|
};
|
|
|
|
static struct sensor_template misc_cap_attrs[] = {
|
|
RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
|
|
RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
|
|
RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
|
|
RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
|
|
{},
|
|
};
|
|
|
|
static struct sensor_template ro_cap_attrs[] = {
|
|
RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
|
|
{},
|
|
};
|
|
|
|
static struct sensor_template rw_cap_attrs[] = {
|
|
RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
|
|
{},
|
|
};
|
|
|
|
static struct sensor_template trip_attrs[] = {
|
|
RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
|
|
RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
|
|
{},
|
|
};
|
|
|
|
static struct sensor_template misc_attrs[] = {
|
|
RO_SENSOR_TEMPLATE("name", show_name, 0),
|
|
RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
|
|
RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
|
|
RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
|
|
{},
|
|
};
|
|
|
|
#undef RO_SENSOR_TEMPLATE
|
|
#undef RW_SENSOR_TEMPLATE
|
|
|
|
/* Read power domain data */
|
|
static void remove_domain_devices(struct acpi_power_meter_resource *resource)
|
|
{
|
|
int i;
|
|
|
|
if (!resource->num_domain_devices)
|
|
return;
|
|
|
|
for (i = 0; i < resource->num_domain_devices; i++) {
|
|
struct acpi_device *obj = resource->domain_devices[i];
|
|
if (!obj)
|
|
continue;
|
|
|
|
sysfs_remove_link(resource->holders_dir,
|
|
kobject_name(&obj->dev.kobj));
|
|
put_device(&obj->dev);
|
|
}
|
|
|
|
kfree(resource->domain_devices);
|
|
kobject_put(resource->holders_dir);
|
|
resource->num_domain_devices = 0;
|
|
}
|
|
|
|
static int read_domain_devices(struct acpi_power_meter_resource *resource)
|
|
{
|
|
int res = 0;
|
|
int i;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *pss;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
|
|
&buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
|
|
return -ENODEV;
|
|
}
|
|
|
|
pss = buffer.pointer;
|
|
if (!pss ||
|
|
pss->type != ACPI_TYPE_PACKAGE) {
|
|
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
|
|
"Invalid _PMD data\n");
|
|
res = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (!pss->package.count)
|
|
goto end;
|
|
|
|
resource->domain_devices = kcalloc(pss->package.count,
|
|
sizeof(struct acpi_device *),
|
|
GFP_KERNEL);
|
|
if (!resource->domain_devices) {
|
|
res = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
resource->holders_dir = kobject_create_and_add("measures",
|
|
&resource->acpi_dev->dev.kobj);
|
|
if (!resource->holders_dir) {
|
|
res = -ENOMEM;
|
|
goto exit_free;
|
|
}
|
|
|
|
resource->num_domain_devices = pss->package.count;
|
|
|
|
for (i = 0; i < pss->package.count; i++) {
|
|
struct acpi_device *obj;
|
|
union acpi_object *element = &(pss->package.elements[i]);
|
|
|
|
/* Refuse non-references */
|
|
if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
|
|
continue;
|
|
|
|
/* Create a symlink to domain objects */
|
|
resource->domain_devices[i] = NULL;
|
|
if (acpi_bus_get_device(element->reference.handle,
|
|
&resource->domain_devices[i]))
|
|
continue;
|
|
|
|
obj = resource->domain_devices[i];
|
|
get_device(&obj->dev);
|
|
|
|
res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
|
|
kobject_name(&obj->dev.kobj));
|
|
if (res) {
|
|
put_device(&obj->dev);
|
|
resource->domain_devices[i] = NULL;
|
|
}
|
|
}
|
|
|
|
res = 0;
|
|
goto end;
|
|
|
|
exit_free:
|
|
kfree(resource->domain_devices);
|
|
end:
|
|
kfree(buffer.pointer);
|
|
return res;
|
|
}
|
|
|
|
/* Registration and deregistration */
|
|
static int register_attrs(struct acpi_power_meter_resource *resource,
|
|
struct sensor_template *attrs)
|
|
{
|
|
struct device *dev = &resource->acpi_dev->dev;
|
|
struct sensor_device_attribute *sensors =
|
|
&resource->sensors[resource->num_sensors];
|
|
int res = 0;
|
|
|
|
while (attrs->label) {
|
|
sensors->dev_attr.attr.name = attrs->label;
|
|
sensors->dev_attr.attr.mode = 0444;
|
|
sensors->dev_attr.show = attrs->show;
|
|
sensors->index = attrs->index;
|
|
|
|
if (attrs->set) {
|
|
sensors->dev_attr.attr.mode |= 0200;
|
|
sensors->dev_attr.store = attrs->set;
|
|
}
|
|
|
|
sysfs_attr_init(&sensors->dev_attr.attr);
|
|
res = device_create_file(dev, &sensors->dev_attr);
|
|
if (res) {
|
|
sensors->dev_attr.attr.name = NULL;
|
|
goto error;
|
|
}
|
|
sensors++;
|
|
resource->num_sensors++;
|
|
attrs++;
|
|
}
|
|
|
|
error:
|
|
return res;
|
|
}
|
|
|
|
static void remove_attrs(struct acpi_power_meter_resource *resource)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < resource->num_sensors; i++) {
|
|
if (!resource->sensors[i].dev_attr.attr.name)
|
|
continue;
|
|
device_remove_file(&resource->acpi_dev->dev,
|
|
&resource->sensors[i].dev_attr);
|
|
}
|
|
|
|
remove_domain_devices(resource);
|
|
|
|
resource->num_sensors = 0;
|
|
}
|
|
|
|
static int setup_attrs(struct acpi_power_meter_resource *resource)
|
|
{
|
|
int res = 0;
|
|
|
|
res = read_domain_devices(resource);
|
|
if (res)
|
|
return res;
|
|
|
|
if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
|
|
res = register_attrs(resource, meter_attrs);
|
|
if (res)
|
|
goto error;
|
|
}
|
|
|
|
if (resource->caps.flags & POWER_METER_CAN_CAP) {
|
|
if (!can_cap_in_hardware()) {
|
|
dev_warn(&resource->acpi_dev->dev,
|
|
"Ignoring unsafe software power cap!\n");
|
|
goto skip_unsafe_cap;
|
|
}
|
|
|
|
if (resource->caps.configurable_cap)
|
|
res = register_attrs(resource, rw_cap_attrs);
|
|
else
|
|
res = register_attrs(resource, ro_cap_attrs);
|
|
|
|
if (res)
|
|
goto error;
|
|
|
|
res = register_attrs(resource, misc_cap_attrs);
|
|
if (res)
|
|
goto error;
|
|
}
|
|
|
|
skip_unsafe_cap:
|
|
if (resource->caps.flags & POWER_METER_CAN_TRIP) {
|
|
res = register_attrs(resource, trip_attrs);
|
|
if (res)
|
|
goto error;
|
|
}
|
|
|
|
res = register_attrs(resource, misc_attrs);
|
|
if (res)
|
|
goto error;
|
|
|
|
return res;
|
|
error:
|
|
remove_attrs(resource);
|
|
return res;
|
|
}
|
|
|
|
static void free_capabilities(struct acpi_power_meter_resource *resource)
|
|
{
|
|
acpi_string *str;
|
|
int i;
|
|
|
|
str = &resource->model_number;
|
|
for (i = 0; i < 3; i++, str++)
|
|
kfree(*str);
|
|
}
|
|
|
|
static int read_capabilities(struct acpi_power_meter_resource *resource)
|
|
{
|
|
int res = 0;
|
|
int i;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
struct acpi_buffer state = { 0, NULL };
|
|
struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
|
|
union acpi_object *pss;
|
|
acpi_string *str;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
|
|
&buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
|
|
return -ENODEV;
|
|
}
|
|
|
|
pss = buffer.pointer;
|
|
if (!pss ||
|
|
pss->type != ACPI_TYPE_PACKAGE ||
|
|
pss->package.count != 14) {
|
|
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
|
|
"Invalid _PMC data\n");
|
|
res = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
/* Grab all the integer data at once */
|
|
state.length = sizeof(struct acpi_power_meter_capabilities);
|
|
state.pointer = &resource->caps;
|
|
|
|
status = acpi_extract_package(pss, &format, &state);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
|
|
res = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (resource->caps.units) {
|
|
dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
|
|
"Unknown units %llu.\n",
|
|
resource->caps.units);
|
|
res = -EINVAL;
|
|
goto end;
|
|
}
|
|
|
|
/* Grab the string data */
|
|
str = &resource->model_number;
|
|
|
|
for (i = 11; i < 14; i++) {
|
|
union acpi_object *element = &(pss->package.elements[i]);
|
|
|
|
if (element->type != ACPI_TYPE_STRING) {
|
|
res = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
*str = kcalloc(element->string.length + 1, sizeof(u8),
|
|
GFP_KERNEL);
|
|
if (!*str) {
|
|
res = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
strncpy(*str, element->string.pointer, element->string.length);
|
|
str++;
|
|
}
|
|
|
|
dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
|
|
goto end;
|
|
error:
|
|
str = &resource->model_number;
|
|
for (i = 0; i < 3; i++, str++)
|
|
kfree(*str);
|
|
end:
|
|
kfree(buffer.pointer);
|
|
return res;
|
|
}
|
|
|
|
/* Handle ACPI event notifications */
|
|
static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
|
|
{
|
|
struct acpi_power_meter_resource *resource;
|
|
int res;
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return;
|
|
|
|
resource = acpi_driver_data(device);
|
|
|
|
switch (event) {
|
|
case METER_NOTIFY_CONFIG:
|
|
mutex_lock(&resource->lock);
|
|
free_capabilities(resource);
|
|
res = read_capabilities(resource);
|
|
mutex_unlock(&resource->lock);
|
|
if (res)
|
|
break;
|
|
|
|
remove_attrs(resource);
|
|
setup_attrs(resource);
|
|
break;
|
|
case METER_NOTIFY_TRIP:
|
|
sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
|
|
break;
|
|
case METER_NOTIFY_CAP:
|
|
sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
|
|
break;
|
|
case METER_NOTIFY_INTERVAL:
|
|
sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
|
|
break;
|
|
case METER_NOTIFY_CAPPING:
|
|
sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
|
|
dev_info(&device->dev, "Capping in progress.\n");
|
|
break;
|
|
default:
|
|
WARN(1, "Unexpected event %d\n", event);
|
|
break;
|
|
}
|
|
|
|
acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
|
|
dev_name(&device->dev), event, 0);
|
|
}
|
|
|
|
static int acpi_power_meter_add(struct acpi_device *device)
|
|
{
|
|
int res;
|
|
struct acpi_power_meter_resource *resource;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
resource = kzalloc(sizeof(struct acpi_power_meter_resource),
|
|
GFP_KERNEL);
|
|
if (!resource)
|
|
return -ENOMEM;
|
|
|
|
resource->sensors_valid = 0;
|
|
resource->acpi_dev = device;
|
|
mutex_init(&resource->lock);
|
|
strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
|
|
device->driver_data = resource;
|
|
|
|
free_capabilities(resource);
|
|
res = read_capabilities(resource);
|
|
if (res)
|
|
goto exit_free;
|
|
|
|
resource->trip[0] = resource->trip[1] = -1;
|
|
|
|
res = setup_attrs(resource);
|
|
if (res)
|
|
goto exit_free;
|
|
|
|
resource->hwmon_dev = hwmon_device_register(&device->dev);
|
|
if (IS_ERR(resource->hwmon_dev)) {
|
|
res = PTR_ERR(resource->hwmon_dev);
|
|
goto exit_remove;
|
|
}
|
|
|
|
res = 0;
|
|
goto exit;
|
|
|
|
exit_remove:
|
|
remove_attrs(resource);
|
|
exit_free:
|
|
kfree(resource);
|
|
exit:
|
|
return res;
|
|
}
|
|
|
|
static int acpi_power_meter_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_power_meter_resource *resource;
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return -EINVAL;
|
|
|
|
resource = acpi_driver_data(device);
|
|
hwmon_device_unregister(resource->hwmon_dev);
|
|
|
|
remove_attrs(resource);
|
|
free_capabilities(resource);
|
|
|
|
kfree(resource);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int acpi_power_meter_resume(struct device *dev)
|
|
{
|
|
struct acpi_power_meter_resource *resource;
|
|
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
resource = acpi_driver_data(to_acpi_device(dev));
|
|
if (!resource)
|
|
return -EINVAL;
|
|
|
|
free_capabilities(resource);
|
|
read_capabilities(resource);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume);
|
|
|
|
static struct acpi_driver acpi_power_meter_driver = {
|
|
.name = "power_meter",
|
|
.class = ACPI_POWER_METER_CLASS,
|
|
.ids = power_meter_ids,
|
|
.ops = {
|
|
.add = acpi_power_meter_add,
|
|
.remove = acpi_power_meter_remove,
|
|
.notify = acpi_power_meter_notify,
|
|
},
|
|
.drv.pm = &acpi_power_meter_pm,
|
|
};
|
|
|
|
/* Module init/exit routines */
|
|
static int __init enable_cap_knobs(const struct dmi_system_id *d)
|
|
{
|
|
cap_in_hardware = 1;
|
|
return 0;
|
|
}
|
|
|
|
static const struct dmi_system_id pm_dmi_table[] __initconst = {
|
|
{
|
|
enable_cap_knobs, "IBM Active Energy Manager",
|
|
{
|
|
DMI_MATCH(DMI_SYS_VENDOR, "IBM")
|
|
},
|
|
},
|
|
{}
|
|
};
|
|
|
|
static int __init acpi_power_meter_init(void)
|
|
{
|
|
int result;
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
|
|
dmi_check_system(pm_dmi_table);
|
|
|
|
result = acpi_bus_register_driver(&acpi_power_meter_driver);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acpi_power_meter_exit(void)
|
|
{
|
|
acpi_bus_unregister_driver(&acpi_power_meter_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
|
|
MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(force_cap_on, bool, 0644);
|
|
MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
|
|
|
|
module_init(acpi_power_meter_init);
|
|
module_exit(acpi_power_meter_exit);
|