Messages in this thread Patch in this message | | | From | Asahi Lina <> | Date | Tue, 21 Feb 2023 16:06:36 +0900 | Subject | [PATCH] rust: time: New module for timekeeping functions |
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This module is intended to contain functions related to kernel timekeeping and time. Initially, this just wraps ktime_get() and ktime_get_boottime() and returns them as core::time::Duration instances. This is useful for drivers that need to implement simple retry loops and timeouts.
Signed-off-by: Asahi Lina <lina@asahilina.net> --- rust/bindings/bindings_helper.h | 4 +++- rust/kernel/lib.rs | 1 + rust/kernel/time.rs | 25 +++++++++++++++++++++++++ 3 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h index 75d85bd6c592..587f3d1c0c9f 100644 --- a/rust/bindings/bindings_helper.h +++ b/rust/bindings/bindings_helper.h @@ -6,8 +6,10 @@ * Sorted alphabetically. */ -#include <linux/slab.h> +#include <linux/ktime.h> #include <linux/refcount.h> +#include <linux/slab.h> +#include <linux/timekeeping.h> /* `bindgen` gets confused at certain things. */ const gfp_t BINDINGS_GFP_KERNEL = GFP_KERNEL; diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index 223564f9f0cc..371b1b17570e 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -37,6 +37,7 @@ mod static_assert; pub mod std_vendor; pub mod str; pub mod sync; +pub mod time; pub mod types; #[doc(hidden)] diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs new file mode 100644 index 000000000000..02844db47d34 --- /dev/null +++ b/rust/kernel/time.rs @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Timekeeping functions. +//! +//! C header: [`include/linux/ktime.h`](../../../../include/linux/ktime.h) +//! C header: [`include/linux/timekeeping.h`](../../../../include/linux/timekeeping.h) + +use crate::bindings; +use core::time::Duration; + +/// Returns the kernel time elapsed since boot, excluding time spent sleeping, as a [`Duration`]. +pub fn ktime_get() -> Duration { + // SAFETY: Function has no side effects and no inputs. + Duration::from_nanos(unsafe { bindings::ktime_get() }.try_into().unwrap()) +} + +/// Returns the kernel time elapsed since boot, including time spent sleeping, as a [`Duration`]. +pub fn ktime_get_boottime() -> Duration { + Duration::from_nanos( + // SAFETY: Function has no side effects and no variable inputs. + unsafe { bindings::ktime_get_with_offset(bindings::tk_offsets_TK_OFFS_BOOT) } + .try_into() + .unwrap(), + ) +} --- base-commit: 89f5349e0673322857bd432fa23113af56673739 change-id: 20230221-gpu-up-time-ea9412204c3b Thank you, ~~ Lina
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