@@ -18,11 +18,15 @@
types::{ARef, Opaque},
};
use core::{
+ fmt,
ops::{Deref, DerefMut},
pin::Pin,
ptr,
};
+#[cfg(CONFIG_PRINTK)]
+use crate::c_str;
+
/// A ref-counted device.
///
/// # Invariants
@@ -66,6 +70,110 @@ pub unsafe fn as_ref<'a>(ptr: *mut bindings::device) -> &'a Self {
// SAFETY: Guaranteed by the safety requirements of the function.
unsafe { &*ptr.cast() }
}
+
+ /// Prints an emergency-level message (level 0) prefixed with device information.
+ ///
+ /// More details are available from [`dev_emerg`].
+ ///
+ /// [`dev_emerg`]: crate::dev_emerg
+ pub fn pr_emerg(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_EMERG, args) };
+ }
+
+ /// Prints an alert-level message (level 1) prefixed with device information.
+ ///
+ /// More details are available from [`dev_alert`].
+ ///
+ /// [`dev_alert`]: crate::dev_alert
+ pub fn pr_alert(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_ALERT, args) };
+ }
+
+ /// Prints a critical-level message (level 2) prefixed with device information.
+ ///
+ /// More details are available from [`dev_crit`].
+ ///
+ /// [`dev_crit`]: crate::dev_crit
+ pub fn pr_crit(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_CRIT, args) };
+ }
+
+ /// Prints an error-level message (level 3) prefixed with device information.
+ ///
+ /// More details are available from [`dev_err`].
+ ///
+ /// [`dev_err`]: crate::dev_err
+ pub fn pr_err(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_ERR, args) };
+ }
+
+ /// Prints a warning-level message (level 4) prefixed with device information.
+ ///
+ /// More details are available from [`dev_warn`].
+ ///
+ /// [`dev_warn`]: crate::dev_warn
+ pub fn pr_warn(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_WARNING, args) };
+ }
+
+ /// Prints a notice-level message (level 5) prefixed with device information.
+ ///
+ /// More details are available from [`dev_notice`].
+ ///
+ /// [`dev_notice`]: crate::dev_notice
+ pub fn pr_notice(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_NOTICE, args) };
+ }
+
+ /// Prints an info-level message (level 6) prefixed with device information.
+ ///
+ /// More details are available from [`dev_info`].
+ ///
+ /// [`dev_info`]: crate::dev_info
+ pub fn pr_info(&self, args: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_INFO, args) };
+ }
+
+ /// Prints a debug-level message (level 7) prefixed with device information.
+ ///
+ /// More details are available from [`dev_dbg`].
+ ///
+ /// [`dev_dbg`]: crate::dev_dbg
+ pub fn pr_dbg(&self, args: fmt::Arguments<'_>) {
+ if cfg!(debug_assertions) {
+ // SAFETY: `klevel` is null-terminated, uses one of the kernel constants.
+ unsafe { self.printk(bindings::KERN_DEBUG, args) };
+ }
+ }
+
+ /// Prints the provided message to the console.
+ ///
+ /// # Safety
+ ///
+ /// Callers must ensure that `klevel` is null-terminated; in particular, one of the
+ /// `KERN_*`constants, for example, `KERN_CRIT`, `KERN_ALERT`, etc.
+ #[cfg_attr(not(CONFIG_PRINTK), allow(unused_variables))]
+ unsafe fn printk(&self, klevel: &[u8], msg: fmt::Arguments<'_>) {
+ // SAFETY: `klevel` is null-terminated and one of the kernel constants. `self.as_raw`
+ // is valid because `self` is valid. The "%pA" format string expects a pointer to
+ // `fmt::Arguments`, which is what we're passing as the last argument.
+ #[cfg(CONFIG_PRINTK)]
+ unsafe {
+ bindings::_dev_printk(
+ klevel as *const _ as *const core::ffi::c_char,
+ self.as_raw(),
+ c_str!("%pA").as_char_ptr(),
+ &msg as *const _ as *const core::ffi::c_void,
+ )
+ };
+ }
}
// SAFETY: Instances of `Device` are always ref-counted.
@@ -175,3 +283,216 @@ fn deref_mut(&mut self) -> &mut U {
&mut self.general
}
}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! dev_printk {
+ ($method:ident, $dev:expr, $($f:tt)*) => {
+ {
+ // We have an explicity `use` statement here so that callers of this macro are not
+ // required to explicitly use the `RawDevice` trait to use its functions.
+ use $crate::device::Device;
+ ($dev).$method(core::format_args!($($f)*));
+ }
+ }
+}
+
+/// Prints an emergency-level message (level 0) prefixed with device information.
+///
+/// This level should be used if the system is unusable.
+///
+/// Equivalent to the kernel's `dev_emerg` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_emerg!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_emerg {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_emerg, $($f)*); }
+}
+
+/// Prints an alert-level message (level 1) prefixed with device information.
+///
+/// This level should be used if action must be taken immediately.
+///
+/// Equivalent to the kernel's `dev_alert` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_alert!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_alert {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_alert, $($f)*); }
+}
+
+/// Prints a critical-level message (level 2) prefixed with device information.
+///
+/// This level should be used in critical conditions.
+///
+/// Equivalent to the kernel's `dev_crit` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_crit!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_crit {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_crit, $($f)*); }
+}
+
+/// Prints an error-level message (level 3) prefixed with device information.
+///
+/// This level should be used in error conditions.
+///
+/// Equivalent to the kernel's `dev_err` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_err!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_err {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_err, $($f)*); }
+}
+
+/// Prints a warning-level message (level 4) prefixed with device information.
+///
+/// This level should be used in warning conditions.
+///
+/// Equivalent to the kernel's `dev_warn` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_warn!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_warn {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_warn, $($f)*); }
+}
+
+/// Prints a notice-level message (level 5) prefixed with device information.
+///
+/// This level should be used in normal but significant conditions.
+///
+/// Equivalent to the kernel's `dev_notice` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_notice!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_notice {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_notice, $($f)*); }
+}
+
+/// Prints an info-level message (level 6) prefixed with device information.
+///
+/// This level should be used for informational messages.
+///
+/// Equivalent to the kernel's `dev_info` macro.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_info!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_info {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_info, $($f)*); }
+}
+
+/// Prints a debug-level message (level 7) prefixed with device information.
+///
+/// This level should be used for debug messages.
+///
+/// Equivalent to the kernel's `dev_dbg` macro, except that it doesn't support dynamic debug yet.
+///
+/// Mimics the interface of [`std::print!`]. More information about the syntax is available from
+/// [`core::fmt`] and [`alloc::format!`].
+///
+/// [`std::print!`]: https://doc.rust-lang.org/std/macro.print.html
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::device::Device;
+///
+/// fn example(dev: &Device) {
+/// dev_dbg!(dev, "hello {}\n", "there");
+/// }
+/// ```
+#[macro_export]
+macro_rules! dev_dbg {
+ ($($f:tt)*) => { $crate::dev_printk!(pr_dbg, $($f)*); }
+}
@@ -27,6 +27,8 @@
// `super::std_vendor` is hidden, which makes the macro inline for some reason.
#[doc(no_inline)]
pub use super::dbg;
+pub use super::fmt;
+pub use super::{dev_alert, dev_crit, dev_dbg, dev_emerg, dev_err, dev_info, dev_notice, dev_warn};
pub use super::{pr_alert, pr_crit, pr_debug, pr_emerg, pr_err, pr_info, pr_notice, pr_warn};
pub use super::{init, pin_init, try_init, try_pin_init};