From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom
---
kernel/arch/x86/kernel/tsc_sync.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++------
1 files changed, 46 insertions(+), 6 deletions(-)
diff --git a/kernel/arch/x86/kernel/tsc_sync.c b/kernel/arch/x86/kernel/tsc_sync.c
index ec534f9..9236600 100644
--- a/kernel/arch/x86/kernel/tsc_sync.c
+++ b/kernel/arch/x86/kernel/tsc_sync.c
@@ -30,6 +30,7 @@
};
static DEFINE_PER_CPU(struct tsc_adjust, tsc_adjust);
+static struct timer_list tsc_sync_check_timer;
/*
* TSC's on different sockets may be reset asynchronously.
@@ -76,6 +77,46 @@
adj->warned = true;
}
}
+
+/*
+ * Normally the tsc_sync will be checked every time system enters idle
+ * state, but there is still caveat that a system won't enter idle,
+ * either because it's too busy or configured purposely to not enter
+ * idle.
+ *
+ * So setup a periodic timer (every 10 minutes) to make sure the check
+ * is always on.
+ */
+
+#define SYNC_CHECK_INTERVAL (HZ * 600)
+
+static void tsc_sync_check_timer_fn(struct timer_list *unused)
+{
+ int next_cpu;
+
+ tsc_verify_tsc_adjust(false);
+
+ /* Run the check for all onlined CPUs in turn */
+ next_cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask);
+ if (next_cpu >= nr_cpu_ids)
+ next_cpu = cpumask_first(cpu_online_mask);
+
+ tsc_sync_check_timer.expires += SYNC_CHECK_INTERVAL;
+ add_timer_on(&tsc_sync_check_timer, next_cpu);
+}
+
+static int __init start_sync_check_timer(void)
+{
+ if (!cpu_feature_enabled(X86_FEATURE_TSC_ADJUST) || tsc_clocksource_reliable)
+ return 0;
+
+ timer_setup(&tsc_sync_check_timer, tsc_sync_check_timer_fn, 0);
+ tsc_sync_check_timer.expires = jiffies + SYNC_CHECK_INTERVAL;
+ add_timer(&tsc_sync_check_timer);
+
+ return 0;
+}
+late_initcall(start_sync_check_timer);
static void tsc_sanitize_first_cpu(struct tsc_adjust *cur, s64 bootval,
unsigned int cpu, bool bootcpu)
@@ -233,7 +274,6 @@
* The measurement runs for 'timeout' msecs:
*/
end = start + (cycles_t) tsc_khz * timeout;
- now = start;
for (i = 0; ; i++) {
/*
@@ -296,7 +336,7 @@
* But as the TSC is per-logical CPU and can potentially be modified wrongly
* by the bios, TSC sync test for smaller duration should be able
* to catch such errors. Also this will catch the condition where all the
- * cores in the socket doesn't get reset at the same time.
+ * cores in the socket don't get reset at the same time.
*/
static inline unsigned int loop_timeout(int cpu)
{
@@ -364,12 +404,12 @@
/* Force it to 0 if random warps brought us here */
atomic_set(&test_runs, 0);
- pr_warning("TSC synchronization [CPU#%d -> CPU#%d]:\n",
+ pr_warn("TSC synchronization [CPU#%d -> CPU#%d]:\n",
smp_processor_id(), cpu);
- pr_warning("Measured %Ld cycles TSC warp between CPUs, "
- "turning off TSC clock.\n", max_warp);
+ pr_warn("Measured %Ld cycles TSC warp between CPUs, "
+ "turning off TSC clock.\n", max_warp);
if (random_warps)
- pr_warning("TSC warped randomly between CPUs\n");
+ pr_warn("TSC warped randomly between CPUs\n");
mark_tsc_unstable("check_tsc_sync_source failed");
}
--
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