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Message-ID: <20240422102415.xvmuja6bdfxgl4pv@vireshk-i7>
Date: Mon, 22 Apr 2024 15:54:15 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Andreas Hindborg <a.hindborg@...sung.com>,
Alice Ryhl <aliceryhl@...gle.com>, linux-pm@...r.kernel.org,
Vincent Guittot <vincent.guittot@...aro.org>,
Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
rust-for-linux@...r.kernel.org,
Manos Pitsidianakis <manos.pitsidianakis@...aro.org>,
Erik Schilling <erik.schilling@...aro.org>,
Alex Bennée <alex.bennee@...aro.org>,
Joakim Bech <joakim.bech@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/3] rust: Add bindings for OPP framework
Thanks for the review Benno. I was waiting for more review comments to
come in and hence didn't reply earlier with an update.
On 07-04-24, 09:54, Benno Lossin wrote:
> On 05.04.24 13:09, Viresh Kumar wrote:
> > + clk_names: Option<Pin<Vec<CString>>>,
>
> Why are you using `Pin<Vec<_>>`? The vector may reallocate the backing
> storage at any point in time.
> > + /// Sets the configuration with the OPP core.
> > + pub fn set(&mut self, dev: &Device) -> Result<()> {
> > + // Already configured.
> > + if self.token.is_some() {
>
> Why does the config hold onto this token? Would it make sense to consume
> the config and return a `Handle` or `Token` abstraction? Then you don't
> need to check if the config has been "used" before.
> > +#[repr(transparent)]
> > +pub struct OPP(*mut bindings::dev_pm_opp);
>
> I think you should use the `ARef` pattern instead:
>
> #[repr(transparent)]
> pub struct OPP(Opaque<bindings::dev_pm_opp>);
>
> unsafe impl AlwaysRefCounted for OPP {
> // ...
> }
>
> Then you can use `ARef<OPP>` everywhere you use `OPP` currently.
All these comments look good to me. Updated the code with them (not
reposting them for now)
-------------------------8<-------------------------
rust/bindings/bindings_helper.h | 1 +
rust/kernel/lib.rs | 2 +
rust/kernel/opp.rs | 888 ++++++++++++++++++++++++++++++++
3 files changed, 891 insertions(+)
create mode 100644 rust/kernel/opp.rs
diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index baabff999bd5..370043838a54 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -22,6 +22,7 @@
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/pid_namespace.h>
+#include <linux/pm_opp.h>
#include <linux/poll.h>
#include <linux/refcount.h>
#include <linux/sched.h>
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index a153336973e6..56b666f466a0 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -46,6 +46,8 @@
#[cfg(CONFIG_NET)]
pub mod net;
pub mod of;
+#[cfg(CONFIG_PM_OPP)]
+pub mod opp;
pub mod platform;
pub mod prelude;
pub mod print;
diff --git a/rust/kernel/opp.rs b/rust/kernel/opp.rs
new file mode 100644
index 000000000000..25e9e818b270
--- /dev/null
+++ b/rust/kernel/opp.rs
@@ -0,0 +1,888 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Operating performance points.
+//!
+//! This module provides bindings for interacting with the OPP subsystem.
+//!
+//! C header: [`include/linux/pm_opp.h`](../../../../../../include/linux/pm_opp.h)
+
+use crate::{
+ bindings,
+ device::{Device, RawDevice},
+ error::{code::*, from_err_ptr, from_result, to_result, Error, Result, VTABLE_DEFAULT_ERROR},
+ prelude::*,
+ str::CString,
+ types::{ARef, AlwaysRefCounted, Opaque},
+};
+
+#[cfg(CONFIG_CPU_FREQ)]
+use crate::cpufreq;
+
+use core::{ffi::c_char, marker::PhantomData, ops::Deref, ptr};
+
+use macros::vtable;
+
+// Creates a null-terminated slice of pointers to Cstrings.
+fn to_c_str_array(names: &Vec<CString>) -> Result<Vec<*const c_char>> {
+ // Allocated a null-terminated vector of pointers.
+ let mut list = Vec::try_with_capacity(names.len() + 1)?;
+
+ for name in names.iter() {
+ list.try_push(name.as_ptr() as _)?;
+ }
+
+ list.try_push(ptr::null())?;
+ Ok(list)
+}
+
+/// Equivalent to `struct dev_pm_opp_data` in the C Code.
+#[repr(transparent)]
+pub struct Data(bindings::dev_pm_opp_data);
+
+impl Data {
+ /// Creates new instance of [`Data`].
+ pub fn new(freq: u64, u_volt: u64, level: u32, turbo: bool) -> Self {
+ Self(bindings::dev_pm_opp_data {
+ turbo,
+ freq,
+ u_volt,
+ level,
+ })
+ }
+}
+
+/// OPP search types.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum SearchType {
+ /// Search for exact value.
+ Exact,
+ /// Search for highest value less than equal to value.
+ Floor,
+ /// Search for lowest value greater than equal to value.
+ Ceil,
+}
+
+/// Implement this trait to provide OPP Configuration callbacks.
+#[vtable]
+pub trait ConfigOps {
+ /// Called by the OPP core to configure OPP clks.
+ fn config_clks(
+ _dev: &Device,
+ _table: &Table,
+ _opp: ARef<OPP>,
+ _scaling_down: bool,
+ ) -> Result<()> {
+ kernel::build_error(VTABLE_DEFAULT_ERROR)
+ }
+
+ /// Called by the OPP core to configure OPP regulators.
+ fn config_regulators(
+ _dev: &Device,
+ _opp_old: ARef<OPP>,
+ _opp_new: ARef<OPP>,
+ _data: *mut *mut bindings::regulator,
+ _count: u32,
+ ) -> Result<()> {
+ kernel::build_error(VTABLE_DEFAULT_ERROR)
+ }
+}
+
+/// Config token returned by the C code.
+pub struct ConfigToken(i32);
+
+impl Drop for ConfigToken {
+ fn drop(&mut self) {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe
+ // to relinquish it now.
+ unsafe { bindings::dev_pm_opp_clear_config(self.0) };
+ }
+}
+
+/// Equivalent to `struct dev_pm_opp_config` in the C Code.
+pub struct Config<T: ConfigOps> {
+ clk_names: Option<Vec<CString>>,
+ prop_name: Option<CString>,
+ regulator_names: Option<Vec<CString>>,
+ genpd_names: Option<Vec<CString>>,
+ supported_hw: Option<Vec<u32>>,
+ required_devs: Option<Vec<Device>>,
+ _data: PhantomData<T>,
+}
+
+impl<T: ConfigOps> Config<T> {
+ /// Creates a new instance of [`Config`].
+ pub fn new() -> Self {
+ Self {
+ clk_names: None,
+ prop_name: None,
+ regulator_names: None,
+ genpd_names: None,
+ supported_hw: None,
+ required_devs: None,
+ _data: PhantomData,
+ }
+ }
+
+ /// Initializes clock names.
+ pub fn set_clk_names(&mut self, names: Vec<CString>) -> Result<()> {
+ // Already configured.
+ if self.clk_names.is_some() {
+ return Err(EBUSY);
+ }
+
+ if names.is_empty() {
+ return Err(EINVAL);
+ }
+
+ self.clk_names = Some(names);
+ Ok(())
+ }
+
+ /// Initializes property name.
+ pub fn set_prop_name(&mut self, name: CString) -> Result<()> {
+ // Already configured.
+ if self.prop_name.is_some() {
+ return Err(EBUSY);
+ }
+
+ self.prop_name = Some(name);
+ Ok(())
+ }
+
+ /// Initializes regulator names.
+ pub fn set_regulator_names(&mut self, names: Vec<CString>) -> Result<()> {
+ // Already configured.
+ if self.regulator_names.is_some() {
+ return Err(EBUSY);
+ }
+
+ if names.is_empty() {
+ return Err(EINVAL);
+ }
+
+ self.regulator_names = Some(names);
+
+ Ok(())
+ }
+
+ /// Initializes genpd names.
+ pub fn set_genpd_names(&mut self, names: Vec<CString>) -> Result<()> {
+ // Already configured. Only one of genpd or required devs can be configured.
+ if self.genpd_names.is_some() || self.required_devs.is_some() {
+ return Err(EBUSY);
+ }
+
+ if names.is_empty() {
+ return Err(EINVAL);
+ }
+
+ self.genpd_names = Some(names);
+ Ok(())
+ }
+
+ /// Initializes required devices.
+ pub fn set_required_devs(&mut self, devs: Vec<Device>) -> Result<()> {
+ // Already configured. Only one of genpd or required devs can be configured.
+ if self.genpd_names.is_some() || self.required_devs.is_some() {
+ return Err(EBUSY);
+ }
+
+ if devs.is_empty() {
+ return Err(EINVAL);
+ }
+
+ self.required_devs = Some(devs);
+ Ok(())
+ }
+
+ /// Initializes supported hardware.
+ pub fn set_supported_hw(&mut self, hw: Vec<u32>) -> Result<()> {
+ // Already configured.
+ if self.supported_hw.is_some() {
+ return Err(EBUSY);
+ }
+
+ if hw.is_empty() {
+ return Err(EINVAL);
+ }
+
+ self.supported_hw = Some(hw);
+ Ok(())
+ }
+
+ /// Sets the configuration with the OPP core.
+ pub fn set(self, dev: &Device) -> Result<ConfigToken> {
+ let (_clk_list, clk_names) = match &self.clk_names {
+ Some(x) => {
+ let list = to_c_str_array(x)?;
+ let ptr = list.as_ptr();
+ (Some(list), ptr)
+ }
+ None => (None, ptr::null()),
+ };
+
+ let (_regulator_list, regulator_names) = match &self.regulator_names {
+ Some(x) => {
+ let list = to_c_str_array(x)?;
+ let ptr = list.as_ptr();
+ (Some(list), ptr)
+ }
+ None => (None, ptr::null()),
+ };
+
+ let (_genpd_list, genpd_names) = match &self.genpd_names {
+ Some(x) => {
+ let list = to_c_str_array(x)?;
+ let ptr = list.as_ptr();
+ (Some(list), ptr)
+ }
+ None => (None, ptr::null()),
+ };
+
+ let prop_name = match &self.prop_name {
+ Some(x) => x.as_char_ptr(),
+ None => ptr::null(),
+ };
+
+ let (supported_hw, supported_hw_count) = match &self.supported_hw {
+ Some(x) => (x.as_ptr(), x.len() as u32),
+ None => (ptr::null(), 0),
+ };
+
+ let (_required_devs_list, required_devs) = match &self.required_devs {
+ Some(x) => {
+ // Create a non-NULL-terminated vectorof pointers.
+ let mut list = Vec::try_with_capacity(x.len())?;
+
+ for dev in x.iter() {
+ list.try_push(dev.raw_device())?;
+ }
+
+ let ptr = list.as_mut_ptr();
+ (Some(list), ptr)
+ }
+ None => (None, ptr::null_mut()),
+ };
+
+ let mut config = bindings::dev_pm_opp_config {
+ clk_names,
+ config_clks: if T::HAS_CONFIG_CLKS {
+ Some(Self::config_clks)
+ } else {
+ None
+ },
+ prop_name,
+ regulator_names,
+ config_regulators: if T::HAS_CONFIG_REGULATORS {
+ Some(Self::config_regulators)
+ } else {
+ None
+ },
+ genpd_names,
+ supported_hw,
+ supported_hw_count,
+
+ // Don't need to support virt_devs for now.
+ virt_devs: ptr::null_mut(),
+ required_devs,
+ };
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements. The OPP core guarantees to not use fields of `config`, after this call has
+ // returned and so we don't need to save a copy of them for future use
+ let ret = unsafe { bindings::dev_pm_opp_set_config(dev.raw_device(), &mut config) };
+ if ret < 0 {
+ Err(Error::from_errno(ret))
+ } else {
+ Ok(ConfigToken(ret))
+ }
+ }
+
+ // Config's config_clks callback.
+ extern "C" fn config_clks(
+ dev: *mut bindings::device,
+ opp_table: *mut bindings::opp_table,
+ opp: *mut bindings::dev_pm_opp,
+ _data: *mut core::ffi::c_void,
+ scaling_down: bool,
+ ) -> core::ffi::c_int {
+ from_result(|| {
+ // SAFETY: 'dev' is guaranteed by the C code to be valid.
+ let dev = unsafe { Device::new(dev) };
+ T::config_clks(
+ &dev,
+ // SAFETY: 'opp_table' is guaranteed by the C code to be valid.
+ &unsafe { Table::from_ptr(opp_table, dev.clone()) },
+ // SAFETY: 'opp' is guaranteed by the C code to be valid.
+ unsafe { OPP::from_ptr(opp)? },
+ scaling_down,
+ )
+ .map(|_| 0)
+ })
+ }
+
+ // Config's config_regulators callback.
+ extern "C" fn config_regulators(
+ dev: *mut bindings::device,
+ old_opp: *mut bindings::dev_pm_opp,
+ new_opp: *mut bindings::dev_pm_opp,
+ regulators: *mut *mut bindings::regulator,
+ count: core::ffi::c_uint,
+ ) -> core::ffi::c_int {
+ from_result(|| {
+ // SAFETY: 'dev' is guaranteed by the C code to be valid.
+ let dev = unsafe { Device::new(dev) };
+ T::config_regulators(
+ &dev,
+ // SAFETY: 'old_opp' is guaranteed by the C code to be valid.
+ unsafe { OPP::from_ptr(old_opp)? },
+ // SAFETY: 'new_opp' is guaranteed by the C code to be valid.
+ unsafe { OPP::from_ptr(new_opp)? },
+ regulators,
+ count,
+ )
+ .map(|_| 0)
+ })
+ }
+}
+
+/// CPU Frequency table created from OPP entries.
+#[cfg(CONFIG_CPU_FREQ)]
+pub struct FreqTable {
+ dev: Device,
+ table: cpufreq::Table,
+}
+
+#[cfg(CONFIG_CPU_FREQ)]
+impl FreqTable {
+ /// Creates new instance of [`FreqTable`] from raw pointer.
+ fn new(table: &Table) -> Result<Self> {
+ let mut ptr: *mut bindings::cpufreq_frequency_table = ptr::null_mut();
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe {
+ bindings::dev_pm_opp_init_cpufreq_table(table.dev.raw_device(), &mut ptr)
+ })?;
+ Ok(Self {
+ dev: table.dev.clone(),
+ // SAFETY: The `ptr` is guaranteed by the C code to be valid.
+ table: unsafe { cpufreq::Table::from_raw(ptr) },
+ })
+ }
+
+ /// Returns reference to the underlying [`cpufreq::Table`].
+ pub fn table(&self) -> &cpufreq::Table {
+ &self.table
+ }
+}
+
+#[cfg(CONFIG_CPU_FREQ)]
+impl Deref for FreqTable {
+ type Target = cpufreq::Table;
+
+ #[inline]
+ fn deref(&self) -> &Self::Target {
+ &self.table
+ }
+}
+
+#[cfg(CONFIG_CPU_FREQ)]
+impl Drop for FreqTable {
+ fn drop(&mut self) {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // relinquish it now.
+ unsafe {
+ bindings::dev_pm_opp_free_cpufreq_table(self.dev.raw_device(), &mut self.as_ptr())
+ };
+ }
+}
+
+/// Operating performance point (OPP) table.
+///
+/// # Invariants
+///
+/// `ptr` is valid, non-null, and has a non-zero reference count. One of the references is owned by
+/// `self`, and will be decremented when `self` is dropped.
+pub struct Table {
+ ptr: *mut bindings::opp_table,
+ dev: Device,
+ em: bool,
+ of: bool,
+ cpumask: Option<cpufreq::Cpumask>,
+}
+
+// SAFETY: The fields of `Table` are safe to be used from any thread.
+unsafe impl Send for Table {}
+
+// SAFETY: The fields of `Table` are safe to be referenced from any thread.
+unsafe impl Sync for Table {}
+
+impl Table {
+ /// Creates a new OPP table instance from raw pointer.
+ ///
+ /// # Safety
+ ///
+ /// Callers must ensure that `ptr` is valid and non-null.
+ unsafe fn from_ptr(ptr: *mut bindings::opp_table, dev: Device) -> Self {
+ // SAFETY: By the safety requirements, ptr is valid and its refcount will be incremented.
+ unsafe { bindings::dev_pm_opp_get_opp_table_ref(ptr) };
+
+ Self {
+ ptr,
+ dev,
+ em: false,
+ of: false,
+ cpumask: None,
+ }
+ }
+
+ /// Find OPP table from device.
+ pub fn from_dev(dev: &Device) -> Result<Self> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements. Refcount of the OPP table is incremented as well.
+ let ptr = from_err_ptr(unsafe { bindings::dev_pm_opp_get_opp_table(dev.raw_device()) })?;
+
+ Ok(Self {
+ ptr,
+ dev: dev.clone(),
+ em: false,
+ of: false,
+ cpumask: None,
+ })
+ }
+
+ /// Add device tree based OPP table for the device.
+ #[cfg(CONFIG_OF)]
+ pub fn from_of(dev: &Device, index: i32) -> Result<Self> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements. Refcount of the OPP table is incremented as well.
+ to_result(unsafe { bindings::dev_pm_opp_of_add_table_indexed(dev.raw_device(), index) })?;
+
+ // Fetch the newly created table.
+ let mut table = Self::from_dev(dev)?;
+ table.of = true;
+
+ Ok(table)
+ }
+
+ // Remove device tree based OPP table for the device.
+ #[cfg(CONFIG_OF)]
+ fn remove_of(&self) {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements. We took the reference from `from_of` earlier, it is safe to drop the same
+ // now.
+ unsafe { bindings::dev_pm_opp_of_remove_table(self.dev.raw_device()) };
+ }
+
+ /// Add device tree based OPP table for CPU devices.
+ #[cfg(CONFIG_OF)]
+ pub fn from_of_cpumask(dev: &Device, cpumask: &mut cpufreq::Cpumask) -> Result<Self> {
+ // SAFETY: The cpumask is valid and the returned ptr will be owned by the [`Table`] instance.
+ to_result(unsafe { bindings::dev_pm_opp_of_cpumask_add_table(cpumask.as_ptr()) })?;
+
+ // Fetch the newly created table.
+ let mut table = Self::from_dev(dev)?;
+ // SAFETY: The `cpumask` is guaranteed by the C code to be valid.
+ table.cpumask = Some(unsafe { cpufreq::Cpumask::new(cpumask.as_mut_ptr()) });
+
+ Ok(table)
+ }
+
+ // Remove device tree based OPP table for CPU devices.
+ #[cfg(CONFIG_OF)]
+ fn remove_of_cpumask(&self, cpumask: &cpufreq::Cpumask) {
+ // SAFETY: The cpumask is valid and we took the reference from `from_of_cpumask` earlier,
+ // it is safe to drop the same now.
+ unsafe { bindings::dev_pm_opp_of_cpumask_remove_table(cpumask.as_ptr()) };
+ }
+
+ /// Returns the number of OPPs in the table.
+ pub fn opp_count(&self) -> Result<u32> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ let ret = unsafe { bindings::dev_pm_opp_get_opp_count(self.dev.raw_device()) };
+ if ret < 0 {
+ Err(Error::from_errno(ret))
+ } else {
+ Ok(ret as u32)
+ }
+ }
+
+ /// Returns max clock latency of the OPPs in the table.
+ pub fn max_clock_latency(&self) -> u64 {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ unsafe { bindings::dev_pm_opp_get_max_clock_latency(self.dev.raw_device()) }
+ }
+
+ /// Returns max volt latency of the OPPs in the table.
+ pub fn max_volt_latency(&self) -> u64 {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ unsafe { bindings::dev_pm_opp_get_max_volt_latency(self.dev.raw_device()) }
+ }
+
+ /// Returns max transition latency of the OPPs in the table.
+ pub fn max_transition_latency(&self) -> u64 {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ unsafe { bindings::dev_pm_opp_get_max_transition_latency(self.dev.raw_device()) }
+ }
+
+ /// Returns the suspend OPP.
+ pub fn suspend_freq(&self) -> u64 {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ unsafe { bindings::dev_pm_opp_get_suspend_opp_freq(self.dev.raw_device()) }
+ }
+
+ /// Synchronizes regulators used by the OPP table.
+ pub fn sync_regulators(&self) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe { bindings::dev_pm_opp_sync_regulators(self.dev.raw_device()) })
+ }
+
+ /// Gets sharing CPUs.
+ pub fn sharing_cpus(dev: &Device, cpumask: &mut cpufreq::Cpumask) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe {
+ bindings::dev_pm_opp_get_sharing_cpus(dev.raw_device(), cpumask.as_mut_ptr())
+ })
+ }
+
+ /// Sets sharing CPUs.
+ pub fn set_sharing_cpus(&self, cpumask: &cpufreq::Cpumask) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe {
+ bindings::dev_pm_opp_set_sharing_cpus(self.dev.raw_device(), cpumask.as_ptr())
+ })
+ }
+
+ /// Gets sharing CPUs from Device tree.
+ #[cfg(CONFIG_OF)]
+ pub fn of_sharing_cpus(dev: &Device, cpumask: &mut cpufreq::Cpumask) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe {
+ bindings::dev_pm_opp_of_get_sharing_cpus(dev.raw_device(), cpumask.as_mut_ptr())
+ })
+ }
+
+ /// Updates the voltage value for an OPP.
+ pub fn adjust_voltage(
+ &self,
+ freq: u64,
+ u_volt: u64,
+ u_volt_min: u64,
+ u_volt_max: u64,
+ ) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe {
+ bindings::dev_pm_opp_adjust_voltage(
+ self.dev.raw_device(),
+ freq,
+ u_volt,
+ u_volt_min,
+ u_volt_max,
+ )
+ })
+ }
+
+ /// Create cpufreq table from OPP table.
+ #[cfg(CONFIG_CPU_FREQ)]
+ pub fn to_cpufreq_table(&mut self) -> Result<FreqTable> {
+ FreqTable::new(self)
+ }
+
+ /// Sets a matching OPP based on frequency.
+ pub fn set_rate(&self, freq: u64) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe { bindings::dev_pm_opp_set_rate(self.dev.raw_device(), freq) })
+ }
+
+ /// Sets exact OPP.
+ pub fn set_opp(&self, opp: ARef<OPP>) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe { bindings::dev_pm_opp_set_opp(self.dev.raw_device(), opp.as_mut_ptr()) })
+ }
+
+ /// Finds OPP based on frequency.
+ pub fn opp_from_freq(
+ &self,
+ mut freq: u64,
+ available: Option<bool>,
+ index: Option<u32>,
+ stype: SearchType,
+ ) -> Result<ARef<OPP>> {
+ let rdev = self.dev.raw_device();
+ let index = index.unwrap_or(0);
+
+ let ptr = from_err_ptr(match stype {
+ SearchType::Exact => {
+ if let Some(available) = available {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and
+ // its safety requirements. The returned ptr will be owned by the new [`OPP`]
+ // instance.
+ unsafe {
+ bindings::dev_pm_opp_find_freq_exact_indexed(rdev, freq, index, available)
+ }
+ } else {
+ return Err(EINVAL);
+ }
+ }
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Ceil => unsafe {
+ bindings::dev_pm_opp_find_freq_ceil_indexed(rdev, &mut freq as *mut u64, index)
+ },
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Floor => unsafe {
+ bindings::dev_pm_opp_find_freq_floor_indexed(rdev, &mut freq as *mut u64, index)
+ },
+ })?;
+
+ // SAFETY: The `ptr` is guaranteed by the C code to be valid.
+ unsafe { OPP::from_ptr_owned(ptr) }
+ }
+
+ /// Finds OPP based on level.
+ pub fn opp_from_level(&self, mut level: u32, stype: SearchType) -> Result<ARef<OPP>> {
+ let rdev = self.dev.raw_device();
+
+ let ptr = from_err_ptr(match stype {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Exact => unsafe { bindings::dev_pm_opp_find_level_exact(rdev, level) },
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Ceil => unsafe {
+ bindings::dev_pm_opp_find_level_ceil(rdev, &mut level as *mut u32)
+ },
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Floor => unsafe {
+ bindings::dev_pm_opp_find_level_floor(rdev, &mut level as *mut u32)
+ },
+ })?;
+
+ // SAFETY: The `ptr` is guaranteed by the C code to be valid.
+ unsafe { OPP::from_ptr_owned(ptr) }
+ }
+
+ /// Finds OPP based on bandwidth.
+ pub fn opp_from_bw(&self, mut bw: u32, index: i32, stype: SearchType) -> Result<ARef<OPP>> {
+ let rdev = self.dev.raw_device();
+
+ let ptr = from_err_ptr(match stype {
+ // The OPP core doesn't support this yet.
+ SearchType::Exact => return Err(EINVAL),
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Ceil => unsafe {
+ bindings::dev_pm_opp_find_bw_ceil(rdev, &mut bw as *mut u32, index)
+ },
+
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its
+ // safety requirements. The returned ptr will be owned by the new [`OPP`] instance.
+ SearchType::Floor => unsafe {
+ bindings::dev_pm_opp_find_bw_floor(rdev, &mut bw as *mut u32, index)
+ },
+ })?;
+
+ // SAFETY: The `ptr` is guaranteed by the C code to be valid.
+ unsafe { OPP::from_ptr_owned(ptr) }
+ }
+
+ /// Enable the OPP.
+ pub fn enable_opp(&self, freq: u64) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe { bindings::dev_pm_opp_enable(self.dev.raw_device(), freq) })
+ }
+
+ /// Disable the OPP.
+ pub fn disable_opp(&self, freq: u64) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe { bindings::dev_pm_opp_disable(self.dev.raw_device(), freq) })
+ }
+
+ /// Registers with Energy model.
+ #[cfg(CONFIG_OF)]
+ pub fn of_register_em(&mut self, cpumask: &mut cpufreq::Cpumask) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe {
+ bindings::dev_pm_opp_of_register_em(self.dev.raw_device(), cpumask.as_mut_ptr())
+ })?;
+
+ self.em = true;
+ Ok(())
+ }
+
+ // Unregisters with Energy model.
+ #[cfg(CONFIG_OF)]
+ fn of_unregister_em(&self) {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements. We registered with the EM framework earlier, it is safe to unregister now.
+ unsafe { bindings::em_dev_unregister_perf_domain(self.dev.raw_device()) };
+ }
+}
+
+impl Drop for Table {
+ fn drop(&mut self) {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe
+ // to relinquish it now.
+ unsafe { bindings::dev_pm_opp_put_opp_table(self.ptr) };
+
+ #[cfg(CONFIG_OF)]
+ {
+ if self.em {
+ self.of_unregister_em();
+ }
+
+ if self.of {
+ self.remove_of();
+ } else if let Some(cpumask) = &self.cpumask {
+ self.remove_of_cpumask(cpumask);
+ }
+ }
+ }
+}
+
+/// Operating performance point (OPP).
+///
+/// # Invariants
+///
+/// `ptr` is valid, non-null, and has a non-zero reference count. One of the references is owned by
+/// `self`, and will be decremented when `self` is dropped.
+#[repr(transparent)]
+pub struct OPP(Opaque<bindings::dev_pm_opp>);
+
+// SAFETY: `OPP` only holds a pointer to a C OPP, which is safe to be used from any thread.
+unsafe impl Send for OPP {}
+
+// SAFETY: `OPP` only holds a pointer to a C OPP, references to which are safe to be used from any
+// thread.
+unsafe impl Sync for OPP {}
+
+// SAFETY: The type invariants guarantee that [`OPP`] is always refcounted.
+unsafe impl AlwaysRefCounted for OPP {
+ fn inc_ref(&self) {
+ // SAFETY: The existence of a shared reference means that the refcount is nonzero.
+ unsafe { bindings::dev_pm_opp_get(self.0.get()) };
+ }
+
+ unsafe fn dec_ref(obj: ptr::NonNull<Self>) {
+ // SAFETY: The safety requirements guarantee that the refcount is nonzero.
+ unsafe { bindings::dev_pm_opp_put(obj.cast().as_ptr()) }
+ }
+}
+
+impl OPP {
+ /// Creates a reference to a [`OPP`] from a valid pointer.
+ ///
+ /// # Safety
+ ///
+ /// The caller must ensure that `ptr` is valid and remains valid for the lifetime of the
+ /// returned [`OPP`] reference.
+ pub unsafe fn from_ptr_owned(ptr: *mut bindings::dev_pm_opp) -> Result<ARef<Self>> {
+ let ptr = ptr::NonNull::new(ptr).ok_or(ENODEV)?;
+
+ // SAFETY: The safety requirements guarantee the validity of the pointer.
+ //
+ // INVARIANT: The refcount is already incremented by the C API that returned the pointer,
+ // and we pass ownership of the refcount to the new `ARef<OPP>`.
+ Ok(unsafe { ARef::from_raw(ptr.cast()) })
+ }
+
+ /// Creates a reference to a [`OPP`] from a valid pointer.
+ ///
+ /// # Safety
+ ///
+ /// The caller must ensure that `ptr` is valid and remains valid for the lifetime of the
+ /// returned [`OPP`] reference.
+ pub unsafe fn from_ptr(ptr: *mut bindings::dev_pm_opp) -> Result<ARef<Self>> {
+ let opp = unsafe { Self::from_ptr_owned(ptr) }?;
+
+ // Take an extra reference to the OPP since the caller didn't take it.
+ opp.inc_ref();
+
+ Ok(opp)
+ }
+
+ fn as_mut_ptr(&self) -> *mut bindings::dev_pm_opp {
+ self.0.get()
+ }
+
+ /// Adds an OPP dynamically.
+ pub fn add(dev: &Device, mut data: Data) -> Result<()> {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ to_result(unsafe { bindings::dev_pm_opp_add_dynamic(dev.raw_device(), &mut data.0) })
+ }
+
+ /// Removes a dynamically added OPP.
+ pub fn remove(dev: &Device, freq: u64) {
+ // SAFETY: The requirements are satisfied by the existence of `RawDevice` and its safety
+ // requirements.
+ unsafe { bindings::dev_pm_opp_remove(dev.raw_device(), freq) };
+ }
+
+ /// Returns the frequency of an OPP.
+ pub fn freq(&self, index: Option<u32>) -> u64 {
+ let index = index.unwrap_or(0);
+
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // use it.
+ unsafe { bindings::dev_pm_opp_get_freq_indexed(self.as_mut_ptr(), index) }
+ }
+
+ /// Returns the voltage of an OPP.
+ pub fn voltage(&self) -> u64 {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // use it.
+ unsafe { bindings::dev_pm_opp_get_voltage(self.as_mut_ptr()) }
+ }
+
+ /// Returns the level of an OPP.
+ pub fn level(&self) -> u32 {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // use it.
+ unsafe { bindings::dev_pm_opp_get_level(self.as_mut_ptr()) }
+ }
+
+ /// Returns the power of an OPP.
+ pub fn power(&self) -> u64 {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // use it.
+ unsafe { bindings::dev_pm_opp_get_power(self.as_mut_ptr()) }
+ }
+
+ /// Returns the required pstate of an OPP.
+ pub fn required_pstate(&self, index: u32) -> u32 {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // use it.
+ unsafe { bindings::dev_pm_opp_get_required_pstate(self.as_mut_ptr(), index) }
+ }
+
+ /// Returns true if the OPP is turbo.
+ pub fn is_turbo(&self) -> bool {
+ // SAFETY: By the type invariants, we know that `self` owns a reference, so it is safe to
+ // use it.
+ unsafe { bindings::dev_pm_opp_is_turbo(self.as_mut_ptr()) }
+ }
+}
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