[PATCH v8 01/14] rust: time: Add Ktime::from_ns()

[Andreas Hindborg <a.hindborg@kernel.org>]

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>
Reviewed-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 379c0f5772e57..87e47f2f5618d 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_nanos(ns: impl Into<bindings::ktime_t>) -> Self {
+        Self { inner: ns.into() }
+    }
 }
 
 /// Returns the number of milliseconds between two ktimes.

-- 
2.47.0