[xen master] xen/riscv: implement get_s_time()

[patchbot@xxxxxxx]

commit 0589bf22156e7778e813dac75acef3471409aaca
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Tue Apr 15 13:25:19 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Apr 15 13:26:42 2025 +0200

    xen/riscv: implement get_s_time()
    
    Also tick_to_ns() is implemeted as it is used in get_s_time().
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Reviewed-by: Jan Beulich<jbeulich@xxxxxxxx>
---
 xen/arch/riscv/include/asm/time.h | 6 ++++++
 xen/arch/riscv/stubs.c            | 5 -----
 xen/arch/riscv/time.c             | 8 ++++++++
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/xen/arch/riscv/include/asm/time.h 
b/xen/arch/riscv/include/asm/time.h
index e8d9ffec57..63bdd471cc 100644
--- a/xen/arch/riscv/include/asm/time.h
+++ b/xen/arch/riscv/include/asm/time.h
@@ -3,6 +3,7 @@
 #define ASM__RISCV__TIME_H
 
 #include <xen/bug.h>
+#include <xen/lib.h>
 #include <xen/types.h>
 #include <asm/csr.h>
 
@@ -23,6 +24,11 @@ static inline cycles_t get_cycles(void)
     return csr_read(CSR_TIME);
 }
 
+static inline s_time_t ticks_to_ns(uint64_t ticks)
+{
+    return muldiv64(ticks, MILLISECS(1), cpu_khz);
+}
+
 void preinit_xen_time(void);
 
 #endif /* ASM__RISCV__TIME_H */
diff --git a/xen/arch/riscv/stubs.c b/xen/arch/riscv/stubs.c
index a1d64534cd..83416d3350 100644
--- a/xen/arch/riscv/stubs.c
+++ b/xen/arch/riscv/stubs.c
@@ -27,11 +27,6 @@ nodemask_t __read_mostly node_online_map = { { [0] = 1UL } };
 
 /* time.c */
 
-s_time_t get_s_time(void)
-{
-    BUG_ON("unimplemented");
-}
-
 int reprogram_timer(s_time_t timeout)
 {
     BUG_ON("unimplemented");
diff --git a/xen/arch/riscv/time.c b/xen/arch/riscv/time.c
index 905bb13eb4..e962f8518d 100644
--- a/xen/arch/riscv/time.c
+++ b/xen/arch/riscv/time.c
@@ -4,10 +4,18 @@
 #include <xen/init.h>
 #include <xen/lib.h>
 #include <xen/sections.h>
+#include <xen/types.h>
 
 unsigned long __ro_after_init cpu_khz; /* CPU clock frequency in kHz. */
 uint64_t __ro_after_init boot_clock_cycles;
 
+s_time_t get_s_time(void)
+{
+    uint64_t ticks = get_cycles() - boot_clock_cycles;
+
+    return ticks_to_ns(ticks);
+}
+
 /* Set up the timer on the boot CPU (early init function) */
 static void __init preinit_dt_xen_time(void)
 {
--
generated by git-patchbot for /home/xen/git/xen.git#master