[v6] hrtimer Rust API

[PATCH v6 01/14] rust: time: Add Ktime::from_ns()

Posted by Andreas Hindborg 11 months, 1 week ago

From: Lyude Paul <lyude@redhat.com>

A simple function to turn the provided value in nanoseconds into a Ktime
value. We allow any type which implements Into<bindings::ktime_t>, which
resolves to Into<i64>.

This is useful for some of the older DRM APIs that never got moved to Ktime

Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/time.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 379c0f5772e575c9ceacb9c85255b13501db8f30..f59e0fea79d3acfddd922f601f569353609aeec1 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -8,6 +8,8 @@
 //! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h).
 //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
 
+use core::convert::Into;
+
 /// The number of nanoseconds per millisecond.
 pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
 
@@ -63,6 +65,12 @@ pub fn to_ns(self) -> i64 {
     pub fn to_ms(self) -> i64 {
         self.divns_constant::<NSEC_PER_MSEC>()
     }
+
+    /// Creates a new Ktime from the given duration in nanoseconds
+    #[inline]
+    pub fn from_ns(ns: impl Into<bindings::ktime_t>) -> Self {
+        Self { inner: ns.into() }
+    }
 }
 
 /// Returns the number of milliseconds between two ktimes.

-- 
2.47.0

Re: [PATCH v6 01/14] rust: time: Add Ktime::from_ns()

Posted by Tamir Duberstein 11 months, 1 week ago

On Fri, Jan 10, 2025 at 3:20 PM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>
> From: Lyude Paul <lyude@redhat.com>
>
> A simple function to turn the provided value in nanoseconds into a Ktime
> value. We allow any type which implements Into<bindings::ktime_t>, which
> resolves to Into<i64>.
>
> This is useful for some of the older DRM APIs that never got moved to Ktime

Missing period.

> Signed-off-by: Lyude Paul <lyude@redhat.com>
> Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
> ---
>  rust/kernel/time.rs | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
> index 379c0f5772e575c9ceacb9c85255b13501db8f30..f59e0fea79d3acfddd922f601f569353609aeec1 100644
> --- a/rust/kernel/time.rs
> +++ b/rust/kernel/time.rs
> @@ -8,6 +8,8 @@
>  //! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h).
>  //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
>
> +use core::convert::Into;
> +
>  /// The number of nanoseconds per millisecond.
>  pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
>
> @@ -63,6 +65,12 @@ pub fn to_ns(self) -> i64 {
>      pub fn to_ms(self) -> i64 {
>          self.divns_constant::<NSEC_PER_MSEC>()
>      }
> +
> +    /// Creates a new Ktime from the given duration in nanoseconds
> +    #[inline]
> +    pub fn from_ns(ns: impl Into<bindings::ktime_t>) -> Self {
> +        Self { inner: ns.into() }
> +    }
>  }

Should this be called `from_nanos` to be consistent with
`core::time::Duration::from_nanos`?

>
>  /// Returns the number of milliseconds between two ktimes.
>
> --
> 2.47.0

Re: [PATCH v6 01/14] rust: time: Add Ktime::from_ns()

Posted by Andreas Hindborg 11 months, 1 week ago

"Tamir Duberstein" <tamird@gmail.com> writes:

> On Fri, Jan 10, 2025 at 3:20 PM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>>
>> From: Lyude Paul <lyude@redhat.com>
>>
>> A simple function to turn the provided value in nanoseconds into a Ktime
>> value. We allow any type which implements Into<bindings::ktime_t>, which
>> resolves to Into<i64>.
>>
>> This is useful for some of the older DRM APIs that never got moved to Ktime
>
> Missing period.
>
>> Signed-off-by: Lyude Paul <lyude@redhat.com>
>> Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
>> ---
>>  rust/kernel/time.rs | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
>> index 379c0f5772e575c9ceacb9c85255b13501db8f30..f59e0fea79d3acfddd922f601f569353609aeec1 100644
>> --- a/rust/kernel/time.rs
>> +++ b/rust/kernel/time.rs
>> @@ -8,6 +8,8 @@
>>  //! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffiesh).
>>  //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
>>
>> +use core::convert::Into;
>> +
>>  /// The number of nanoseconds per millisecond.
>>  pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
>>
>> @@ -63,6 +65,12 @@ pub fn to_ns(self) -> i64 {
>>      pub fn to_ms(self) -> i64 {
>>          self.divns_constant::<NSEC_PER_MSEC>()
>>      }
>> +
>> +    /// Creates a new Ktime from the given duration in nanoseconds
>> +    #[inline]
>> +    pub fn from_ns(ns: impl Into<bindings::ktime_t>) -> Self {
>> +        Self { inner: ns.into() }
>> +    }
>>  }
>
> Should this be called `from_nanos` to be consistent with
> `core::time::Duration::from_nanos`?

I am OK with that. @Lyude you OK with me changing this?


Best regards,
Andreas Hindborg