2015-09-04 15:17:26 +07:00
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/*
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* Generic OPP Interface
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __DRIVER_OPP_H__
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#define __DRIVER_OPP_H__
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#include <linux/device.h>
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#include <linux/kernel.h>
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2017-01-23 11:41:46 +07:00
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#include <linux/kref.h>
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2015-09-04 15:17:26 +07:00
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#include <linux/list.h>
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2015-11-11 09:29:01 +07:00
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#include <linux/limits.h>
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2015-09-04 15:17:26 +07:00
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#include <linux/pm_opp.h>
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2017-01-23 11:41:49 +07:00
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#include <linux/notifier.h>
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2015-09-04 15:17:26 +07:00
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2016-02-09 12:00:38 +07:00
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struct clk;
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2016-02-09 12:00:33 +07:00
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struct regulator;
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PM / OPP: Protect updates to list_dev with mutex
dev_opp_list_lock is used everywhere to protect device and OPP lists,
but dev_pm_opp_set_sharing_cpus() is missed somehow. And instead we used
rcu-lock, which wouldn't help here as we are adding a new list_dev.
This also fixes a problem where we have called kzalloc(..., GFP_KERNEL)
from within rcu-lock, which isn't allowed as kzalloc can sleep when
called with GFP_KERNEL.
With CONFIG_DEBUG_ATOMIC_SLEEP set, we get following lockdep-splat:
include/linux/rcupdate.h:578 Illegal context switch in RCU read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
5 locks held by swapper/0/1:
#0: (&dev->mutex){......}, at: [<c02f68f4>] __driver_attach+0x48/0x98
#1: (&dev->mutex){......}, at: [<c02f6904>] __driver_attach+0x58/0x98
#2: (cpu_hotplug.lock){++++++}, at: [<c00249d0>] get_online_cpus+0x40/0xb0
#3: (subsys mutex#5){+.+.+.}, at: [<c02f4f8c>] subsys_interface_register+0x44/0xdc
#4: (rcu_read_lock){......}, at: [<c0305c80>] dev_pm_opp_set_sharing_cpus+0x0/0x1e4
stack backtrace:
CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 4.3.0-rc7-00047-g81f5932958a8 #59
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[<c0016874>] (unwind_backtrace) from [<c001355c>] (show_stack+0x10/0x14)
[<c001355c>] (show_stack) from [<c022553c>] (dump_stack+0x94/0xbc)
[<c022553c>] (dump_stack) from [<c004904c>] (___might_sleep+0x24c/0x298)
[<c004904c>] (___might_sleep) from [<c00f07e4>] (kmem_cache_alloc+0xe8/0x164)
[<c00f07e4>] (kmem_cache_alloc) from [<c0305354>] (_add_list_dev+0x30/0x58)
[<c0305354>] (_add_list_dev) from [<c0305d50>] (dev_pm_opp_set_sharing_cpus+0xd0/0x1e4)
[<c0305d50>] (dev_pm_opp_set_sharing_cpus) from [<c040eda4>] (cpufreq_init+0x4cc/0x62c)
[<c040eda4>] (cpufreq_init) from [<c040a964>] (cpufreq_online+0xbc/0x73c)
[<c040a964>] (cpufreq_online) from [<c02f4fe0>] (subsys_interface_register+0x98/0xdc)
[<c02f4fe0>] (subsys_interface_register) from [<c040a640>] (cpufreq_register_driver+0x110/0x17c)
[<c040a640>] (cpufreq_register_driver) from [<c040ef64>] (dt_cpufreq_probe+0x60/0x8c)
[<c040ef64>] (dt_cpufreq_probe) from [<c02f8084>] (platform_drv_probe+0x44/0xa4)
[<c02f8084>] (platform_drv_probe) from [<c02f67c0>] (driver_probe_device+0x208/0x2f4)
[<c02f67c0>] (driver_probe_device) from [<c02f6940>] (__driver_attach+0x94/0x98)
[<c02f6940>] (__driver_attach) from [<c02f4c1c>] (bus_for_each_dev+0x68/0x9c)
Reported-by: Michael Turquette <mturquette@baylibre.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 4.3 <stable@vger.kernel.org> # 4.3
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-11-05 15:51:19 +07:00
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/* Lock to allow exclusive modification to the device and opp lists */
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2016-02-16 15:47:53 +07:00
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extern struct mutex opp_table_lock;
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PM / OPP: Protect updates to list_dev with mutex
dev_opp_list_lock is used everywhere to protect device and OPP lists,
but dev_pm_opp_set_sharing_cpus() is missed somehow. And instead we used
rcu-lock, which wouldn't help here as we are adding a new list_dev.
This also fixes a problem where we have called kzalloc(..., GFP_KERNEL)
from within rcu-lock, which isn't allowed as kzalloc can sleep when
called with GFP_KERNEL.
With CONFIG_DEBUG_ATOMIC_SLEEP set, we get following lockdep-splat:
include/linux/rcupdate.h:578 Illegal context switch in RCU read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
5 locks held by swapper/0/1:
#0: (&dev->mutex){......}, at: [<c02f68f4>] __driver_attach+0x48/0x98
#1: (&dev->mutex){......}, at: [<c02f6904>] __driver_attach+0x58/0x98
#2: (cpu_hotplug.lock){++++++}, at: [<c00249d0>] get_online_cpus+0x40/0xb0
#3: (subsys mutex#5){+.+.+.}, at: [<c02f4f8c>] subsys_interface_register+0x44/0xdc
#4: (rcu_read_lock){......}, at: [<c0305c80>] dev_pm_opp_set_sharing_cpus+0x0/0x1e4
stack backtrace:
CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 4.3.0-rc7-00047-g81f5932958a8 #59
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[<c0016874>] (unwind_backtrace) from [<c001355c>] (show_stack+0x10/0x14)
[<c001355c>] (show_stack) from [<c022553c>] (dump_stack+0x94/0xbc)
[<c022553c>] (dump_stack) from [<c004904c>] (___might_sleep+0x24c/0x298)
[<c004904c>] (___might_sleep) from [<c00f07e4>] (kmem_cache_alloc+0xe8/0x164)
[<c00f07e4>] (kmem_cache_alloc) from [<c0305354>] (_add_list_dev+0x30/0x58)
[<c0305354>] (_add_list_dev) from [<c0305d50>] (dev_pm_opp_set_sharing_cpus+0xd0/0x1e4)
[<c0305d50>] (dev_pm_opp_set_sharing_cpus) from [<c040eda4>] (cpufreq_init+0x4cc/0x62c)
[<c040eda4>] (cpufreq_init) from [<c040a964>] (cpufreq_online+0xbc/0x73c)
[<c040a964>] (cpufreq_online) from [<c02f4fe0>] (subsys_interface_register+0x98/0xdc)
[<c02f4fe0>] (subsys_interface_register) from [<c040a640>] (cpufreq_register_driver+0x110/0x17c)
[<c040a640>] (cpufreq_register_driver) from [<c040ef64>] (dt_cpufreq_probe+0x60/0x8c)
[<c040ef64>] (dt_cpufreq_probe) from [<c02f8084>] (platform_drv_probe+0x44/0xa4)
[<c02f8084>] (platform_drv_probe) from [<c02f67c0>] (driver_probe_device+0x208/0x2f4)
[<c02f67c0>] (driver_probe_device) from [<c02f6940>] (__driver_attach+0x94/0x98)
[<c02f6940>] (__driver_attach) from [<c02f4c1c>] (bus_for_each_dev+0x68/0x9c)
Reported-by: Michael Turquette <mturquette@baylibre.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 4.3 <stable@vger.kernel.org> # 4.3
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-11-05 15:51:19 +07:00
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2016-05-05 17:50:33 +07:00
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extern struct list_head opp_tables;
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2015-09-04 15:17:26 +07:00
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/*
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* Internal data structure organization with the OPP layer library is as
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* follows:
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2016-02-16 15:47:53 +07:00
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* opp_tables (root)
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2015-09-04 15:17:26 +07:00
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* |- device 1 (represents voltage domain 1)
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* | |- opp 1 (availability, freq, voltage)
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* | |- opp 2 ..
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* ... ...
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* | `- opp n ..
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* |- device 2 (represents the next voltage domain)
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* ...
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* `- device m (represents mth voltage domain)
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2016-02-16 15:47:53 +07:00
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* device 1, 2.. are represented by opp_table structure while each opp
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2015-09-04 15:17:26 +07:00
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* is represented by the opp structure.
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*/
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/**
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* struct dev_pm_opp - Generic OPP description structure
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2016-02-16 15:47:53 +07:00
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* @node: opp table node. The nodes are maintained throughout the lifetime
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2015-09-04 15:17:26 +07:00
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* of boot. It is expected only an optimal set of OPPs are
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* added to the library by the SoC framework.
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* IMPORTANT: the opp nodes should be maintained in increasing
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* order.
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2017-01-23 11:41:46 +07:00
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* @kref: for reference count of the OPP.
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2015-09-04 15:17:26 +07:00
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* @available: true/false - marks if this OPP as available or not
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2015-11-19 10:43:56 +07:00
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* @dynamic: not-created from static DT entries.
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2015-09-04 15:17:26 +07:00
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* @turbo: true if turbo (boost) OPP
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2015-11-11 09:29:01 +07:00
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* @suspend: true if suspend OPP
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2017-10-11 14:24:14 +07:00
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* @pstate: Device's power domain's performance state.
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2015-09-04 15:17:26 +07:00
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* @rate: Frequency in hertz
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2016-12-01 17:58:19 +07:00
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* @supplies: Power supplies voltage/current values
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2015-09-04 15:17:26 +07:00
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* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
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* frequency from any other OPP's frequency.
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2016-02-16 15:47:53 +07:00
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* @opp_table: points back to the opp_table struct this opp belongs to
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2015-09-04 15:17:26 +07:00
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* @np: OPP's device node.
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2015-11-11 09:29:01 +07:00
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* @dentry: debugfs dentry pointer (per opp)
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2015-09-04 15:17:26 +07:00
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*
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* This structure stores the OPP information for a given device.
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*/
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struct dev_pm_opp {
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struct list_head node;
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2017-01-23 11:41:46 +07:00
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struct kref kref;
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2015-09-04 15:17:26 +07:00
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bool available;
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bool dynamic;
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bool turbo;
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2015-11-11 09:29:01 +07:00
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bool suspend;
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2017-10-11 14:24:14 +07:00
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unsigned int pstate;
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2015-09-04 15:17:26 +07:00
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unsigned long rate;
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2016-12-01 17:58:19 +07:00
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struct dev_pm_opp_supply *supplies;
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2016-12-01 17:58:17 +07:00
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2015-09-04 15:17:26 +07:00
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unsigned long clock_latency_ns;
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2016-02-16 15:47:53 +07:00
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struct opp_table *opp_table;
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2015-09-04 15:17:26 +07:00
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struct device_node *np;
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2015-11-11 09:29:01 +07:00
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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#endif
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2015-09-04 15:17:26 +07:00
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};
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/**
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2016-02-16 15:47:53 +07:00
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* struct opp_device - devices managed by 'struct opp_table'
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2015-09-04 15:17:26 +07:00
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* @node: list node
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* @dev: device to which the struct object belongs
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2015-11-11 09:29:01 +07:00
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* @dentry: debugfs dentry pointer (per device)
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2015-09-04 15:17:26 +07:00
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*
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2016-02-16 15:47:53 +07:00
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* This is an internal data structure maintaining the devices that are managed
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* by 'struct opp_table'.
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2015-09-04 15:17:26 +07:00
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*/
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2016-02-16 15:47:53 +07:00
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struct opp_device {
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2015-09-04 15:17:26 +07:00
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struct list_head node;
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const struct device *dev;
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2015-11-11 09:29:01 +07:00
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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#endif
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2015-09-04 15:17:26 +07:00
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};
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2016-06-16 20:33:11 +07:00
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enum opp_table_access {
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OPP_TABLE_ACCESS_UNKNOWN = 0,
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OPP_TABLE_ACCESS_EXCLUSIVE = 1,
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OPP_TABLE_ACCESS_SHARED = 2,
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};
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2015-09-04 15:17:26 +07:00
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/**
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2016-02-16 15:47:53 +07:00
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* struct opp_table - Device opp structure
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* @node: table node - contains the devices with OPPs that
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2015-09-04 15:17:26 +07:00
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* have been registered. Nodes once added are not modified in this
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2016-02-16 15:47:53 +07:00
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* table.
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2017-01-23 11:41:49 +07:00
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* @head: notifier head to notify the OPP availability changes.
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2015-09-04 15:17:26 +07:00
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* @dev_list: list of devices that share these OPPs
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2016-02-16 15:47:53 +07:00
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* @opp_list: table of opps
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2017-01-23 11:41:42 +07:00
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* @kref: for reference count of the table.
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2018-09-11 12:44:11 +07:00
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* @list_kref: for reference count of the OPP list.
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2018-08-03 08:35:21 +07:00
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* @lock: mutex protecting the opp_list and dev_list.
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2015-09-04 15:17:26 +07:00
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* @np: struct device_node pointer for opp's DT node.
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2015-11-19 10:43:56 +07:00
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* @clock_latency_ns_max: Max clock latency in nanoseconds.
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2018-06-14 13:34:43 +07:00
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* @parsed_static_opps: True if OPPs are initialized from DT.
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2015-09-04 15:17:26 +07:00
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* @shared_opp: OPP is shared between multiple devices.
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2015-11-19 10:43:56 +07:00
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* @suspend_opp: Pointer to OPP to be used during device suspend.
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2015-12-09 09:31:46 +07:00
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* @supported_hw: Array of version number to support.
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* @supported_hw_count: Number of elements in supported_hw array.
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2015-12-09 09:31:47 +07:00
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* @prop_name: A name to postfix to many DT properties, while parsing them.
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2016-02-09 12:00:38 +07:00
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* @clk: Device's clock handle
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2016-12-01 17:58:19 +07:00
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* @regulators: Supply regulators
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* @regulator_count: Number of power supply regulators
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2017-10-11 14:24:14 +07:00
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* @genpd_performance_state: Device's power domain support performance state.
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2016-12-01 17:58:21 +07:00
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* @set_opp: Platform specific set_opp callback
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2016-12-01 17:58:20 +07:00
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* @set_opp_data: Data to be passed to set_opp callback
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2015-11-11 09:29:01 +07:00
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* @dentry: debugfs dentry pointer of the real device directory (not links).
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* @dentry_name: Name of the real dentry.
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2015-09-04 15:17:26 +07:00
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*
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2016-02-09 12:00:37 +07:00
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* @voltage_tolerance_v1: In percentage, for v1 bindings only.
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*
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2015-09-04 15:17:26 +07:00
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* This is an internal data structure maintaining the link to opps attached to
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* a device. This structure is not meant to be shared to users as it is
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* meant for book keeping and private to OPP library.
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*/
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2016-02-16 15:47:53 +07:00
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struct opp_table {
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2015-09-04 15:17:26 +07:00
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struct list_head node;
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2017-01-23 11:41:49 +07:00
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struct blocking_notifier_head head;
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2015-09-04 15:17:26 +07:00
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struct list_head dev_list;
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struct list_head opp_list;
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2017-01-23 11:41:42 +07:00
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struct kref kref;
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2018-09-11 12:44:11 +07:00
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struct kref list_kref;
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2017-01-23 11:41:41 +07:00
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struct mutex lock;
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2015-09-04 15:17:26 +07:00
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struct device_node *np;
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unsigned long clock_latency_ns_max;
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2016-02-09 12:00:37 +07:00
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/* For backward compatibility with v1 bindings */
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unsigned int voltage_tolerance_v1;
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2018-06-14 13:34:43 +07:00
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bool parsed_static_opps;
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2016-06-16 20:33:11 +07:00
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enum opp_table_access shared_opp;
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2015-09-04 15:17:26 +07:00
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struct dev_pm_opp *suspend_opp;
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2015-11-11 09:29:01 +07:00
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2015-12-09 09:31:46 +07:00
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unsigned int *supported_hw;
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unsigned int supported_hw_count;
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2015-12-09 09:31:47 +07:00
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const char *prop_name;
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2016-02-09 12:00:38 +07:00
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struct clk *clk;
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2016-12-01 17:58:19 +07:00
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struct regulator **regulators;
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unsigned int regulator_count;
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2017-10-11 14:24:14 +07:00
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bool genpd_performance_state;
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2015-12-09 09:31:46 +07:00
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2016-12-01 17:58:21 +07:00
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int (*set_opp)(struct dev_pm_set_opp_data *data);
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2016-12-01 17:58:20 +07:00
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struct dev_pm_set_opp_data *set_opp_data;
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2015-11-11 09:29:01 +07:00
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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char dentry_name[NAME_MAX];
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#endif
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2015-09-04 15:17:26 +07:00
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};
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/* Routines internal to opp core */
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2017-11-29 16:48:36 +07:00
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void dev_pm_opp_get(struct dev_pm_opp *opp);
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2018-09-12 14:05:19 +07:00
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void _opp_remove_all_static(struct opp_table *opp_table);
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2017-01-23 11:41:42 +07:00
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void _get_opp_table_kref(struct opp_table *opp_table);
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2018-04-06 16:05:45 +07:00
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int _get_opp_count(struct opp_table *opp_table);
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2016-02-16 15:47:53 +07:00
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struct opp_table *_find_opp_table(struct device *dev);
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struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
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2018-09-13 14:44:36 +07:00
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void _dev_pm_opp_find_and_remove_table(struct device *dev);
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2017-01-02 16:11:01 +07:00
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struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
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void _opp_free(struct dev_pm_opp *opp);
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2018-04-06 16:05:45 +07:00
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int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available);
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2017-01-02 16:11:01 +07:00
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int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
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2018-09-13 14:44:36 +07:00
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void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
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2017-01-02 16:11:01 +07:00
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struct opp_table *_add_opp_table(struct device *dev);
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2018-09-11 12:44:11 +07:00
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void _put_opp_list_kref(struct opp_table *opp_table);
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2016-05-05 17:50:33 +07:00
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#ifdef CONFIG_OF
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2018-09-05 17:47:14 +07:00
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void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
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2018-09-07 10:31:54 +07:00
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struct opp_table *_managed_opp(struct device *dev, int index);
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2016-05-05 17:50:33 +07:00
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#else
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2018-09-05 17:47:14 +07:00
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static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
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2018-09-07 10:31:54 +07:00
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static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
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2016-05-05 17:50:33 +07:00
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#endif
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2015-09-04 15:17:26 +07:00
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2015-11-11 09:29:01 +07:00
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#ifdef CONFIG_DEBUG_FS
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void opp_debug_remove_one(struct dev_pm_opp *opp);
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2016-02-16 15:47:53 +07:00
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int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
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int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
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void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
|
2015-11-11 09:29:01 +07:00
|
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|
#else
|
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static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
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static inline int opp_debug_create_one(struct dev_pm_opp *opp,
|
2016-02-16 15:47:53 +07:00
|
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struct opp_table *opp_table)
|
2015-11-11 09:29:01 +07:00
|
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{ return 0; }
|
2016-02-16 15:47:53 +07:00
|
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static inline int opp_debug_register(struct opp_device *opp_dev,
|
|
|
|
struct opp_table *opp_table)
|
2015-11-11 09:29:01 +07:00
|
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|
{ return 0; }
|
|
|
|
|
2016-02-16 15:47:53 +07:00
|
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static inline void opp_debug_unregister(struct opp_device *opp_dev,
|
|
|
|
struct opp_table *opp_table)
|
2015-11-11 09:29:01 +07:00
|
|
|
{ }
|
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|
|
#endif /* DEBUG_FS */
|
|
|
|
|
2015-09-04 15:17:26 +07:00
|
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|
#endif /* __DRIVER_OPP_H__ */
|