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powerpc/time: Expose boot_tb via accessor

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- Define accessor function get_boot_tb() to safely return boot_tb value,
  this is only needed when running in SPLPAR environments, so the
  accessor is built conditionally under CONFIG_PPC_SPLPAR.

- Tag boot_tb as __ro_after_init since it is written once at initialized
  and never updated afterwards.

Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
Tested-by: Tejas Manhas <tejas05@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250915102947.26681-2-atrajeev@linux.ibm.com
This commit is contained in:
Aboorva Devarajan
2025-09-15 15:59:41 +05:30
committed by Madhavan Srinivasan
parent 9316512b71
commit 2dc019ca39
2 changed files with 11 additions and 1 deletions
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4
arch/powerpc/include/asm/time.h
View File

@@ -29,6 +29,10 @@ extern u64 decrementer_max;
extern void generic_calibrate_decr(void);
#ifdef CONFIG_PPC_SPLPAR
extern u64 get_boot_tb(void);
#endif
/* Some sane defaults: 125 MHz timebase, 1GHz processor */
extern unsigned long ppc_proc_freq;
#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)

8
arch/powerpc/kernel/time.c
View File

@@ -137,7 +137,7 @@ EXPORT_SYMBOL_GPL(rtc_lock);
static u64 tb_to_ns_scale __read_mostly;
static unsigned tb_to_ns_shift __read_mostly;
static u64 boot_tb __read_mostly;
static u64 boot_tb __ro_after_init;
extern struct timezone sys_tz;
static long timezone_offset;
@@ -639,6 +639,12 @@ notrace unsigned long long sched_clock(void)
return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift;
}
#ifdef CONFIG_PPC_SPLPAR
u64 get_boot_tb(void)
{
return boot_tb;
}
#endif
#ifdef CONFIG_PPC_PSERIES