git: e0a44adb80e0 - stable/14 - e1000: Delay safe_pause switch until SI_SUB_CLOCKS

The branch stable/14 has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=e0a44adb80e00e05649bc064d9014b3fec8d0980

commit e0a44adb80e00e05649bc064d9014b3fec8d0980
Author:     Joyu Liao <joyul@juniper.net>
AuthorDate: 2024-09-25 09:19:13 +0000
Commit:     Kevin Bowling <kbowling@FreeBSD.org>
CommitDate: 2024-10-02 19:52:27 +0000

    e1000: Delay safe_pause switch until SI_SUB_CLOCKS
    
    Based on sysinit_sub_id, SI_SUB_CLOCKS is after SI_SUB_CONFIGURE.
    
    SI_SUB_CONFIGURE  = 0x3800000,  /* Configure devices */  
    At this stage, the variable “cold” will be set to 0.
    
    SI_SUB_CLOCKS    = 0x4800000,  /* real-time and stat clocks*/
    At this stage, the clock configuration will be done, and the real-time
    clock can be used.
    
    In the e1000 driver, if the API safe_pause_* are called between
    SI_SUB_CONFIGURE and SI_SUB_CLOCKS stages, it will choose the wrong
    clock source. The API safe_pause_* uses “cold” the value of which is
    updated in SI_SUB_CONFIGURE, to decide if the real-time clock source is
    ready. However, the real-time clock is not ready til the SI_SUB_CLOCKS
    routines are done.
    
    Obtained from:  Juniper Networks
    Differential Revision:  https://reviews.freebsd.org/D42920
    
    (cherry picked from commit 930a1e6f3d2dd629774f1b48b1acf7ba482ab659)
---
 sys/dev/e1000/e1000_osdep.c | 10 ++++++++++
 sys/dev/e1000/e1000_osdep.h |  6 ++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/sys/dev/e1000/e1000_osdep.c b/sys/dev/e1000/e1000_osdep.c
index 8016ee352068..8b598f18cf12 100644
--- a/sys/dev/e1000/e1000_osdep.c
+++ b/sys/dev/e1000/e1000_osdep.c
@@ -34,6 +34,16 @@
 
 #include "e1000_api.h"
 
+int e1000_use_pause_delay = 0;
+
+static void
+e1000_enable_pause_delay(void *use_pause_delay)
+{
+	*((int *)use_pause_delay) = 1;
+}
+
+SYSINIT(enable_pause_delay, SI_SUB_CLOCKS, SI_ORDER_ANY, e1000_enable_pause_delay, &e1000_use_pause_delay);
+
 /*
  * NOTE: the following routines using the e1000 
  * 	naming style are provided to the shared
diff --git a/sys/dev/e1000/e1000_osdep.h b/sys/dev/e1000/e1000_osdep.h
index bddb97afd8b9..893979025f01 100644
--- a/sys/dev/e1000/e1000_osdep.h
+++ b/sys/dev/e1000/e1000_osdep.h
@@ -79,9 +79,11 @@ ms_scale(int x) {
 	}
 }
 
+extern int e1000_use_pause_delay;
+
 static inline void
 safe_pause_us(int x) {
-	if (cold) {
+	if (!e1000_use_pause_delay) {
 		DELAY(x);
 	} else {
 		pause("e1000_delay", max(1,  x/(1000000/hz)));
@@ -90,7 +92,7 @@ safe_pause_us(int x) {
 
 static inline void
 safe_pause_ms(int x) {
-	if (cold) {
+	if (!e1000_use_pause_delay) {
 		DELAY(x*1000);
 	} else {
 		pause("e1000_delay", ms_scale(x));