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authorStephen Rothwell <sfr@canb.auug.org.au>2005-05-25 16:29:26 +1000
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-25 10:13:43 -0700
commitd0e8e29100c9866878d43bbb40ca17e8fe429851 (patch)
tree079da8af2553ae3dd3556e82a5f8d2362b0ea755
parent8f80e5c911465743ccd3a328f992c7d8aaebf1e8 (diff)
[PATCH] ppc64 iSeries: fix boot time setting
For quite a while, there has existed a hypervisor bug on legacy iSeries which means that we do not get the boot time set in the kernel. This patch works around that bug. This was most noticable when the root partition needed to be checked at every boot as the kernel thought it was some time in 1905 until user mode reset the time correctly. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/ppc64/kernel/mf.c85
-rw-r--r--arch/ppc64/kernel/rtc.c39
-rw-r--r--include/asm-ppc64/iSeries/mf.h1
3 files changed, 67 insertions, 58 deletions
diff --git a/arch/ppc64/kernel/mf.c b/arch/ppc64/kernel/mf.c
index 1bd52ece497..5aca7e8005a 100644
--- a/arch/ppc64/kernel/mf.c
+++ b/arch/ppc64/kernel/mf.c
@@ -1,7 +1,7 @@
/*
* mf.c
* Copyright (C) 2001 Troy D. Armstrong IBM Corporation
- * Copyright (C) 2004 Stephen Rothwell IBM Corporation
+ * Copyright (C) 2004-2005 Stephen Rothwell IBM Corporation
*
* This modules exists as an interface between a Linux secondary partition
* running on an iSeries and the primary partition's Virtual Service
@@ -36,10 +36,12 @@
#include <asm/time.h>
#include <asm/uaccess.h>
+#include <asm/paca.h>
#include <asm/iSeries/vio.h>
#include <asm/iSeries/mf.h>
#include <asm/iSeries/HvLpConfig.h>
#include <asm/iSeries/ItSpCommArea.h>
+#include <asm/iSeries/ItLpQueue.h>
/*
* This is the structure layout for the Machine Facilites LPAR event
@@ -696,36 +698,23 @@ static void get_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
complete(&rtc->com);
}
-int mf_get_rtc(struct rtc_time *tm)
+static int rtc_set_tm(int rc, u8 *ce_msg, struct rtc_time *tm)
{
- struct ce_msg_comp_data ce_complete;
- struct rtc_time_data rtc_data;
- int rc;
-
- memset(&ce_complete, 0, sizeof(ce_complete));
- memset(&rtc_data, 0, sizeof(rtc_data));
- init_completion(&rtc_data.com);
- ce_complete.handler = &get_rtc_time_complete;
- ce_complete.token = &rtc_data;
- rc = signal_ce_msg_simple(0x40, &ce_complete);
- if (rc)
- return rc;
- wait_for_completion(&rtc_data.com);
tm->tm_wday = 0;
tm->tm_yday = 0;
tm->tm_isdst = 0;
- if (rtc_data.rc) {
+ if (rc) {
tm->tm_sec = 0;
tm->tm_min = 0;
tm->tm_hour = 0;
tm->tm_mday = 15;
tm->tm_mon = 5;
tm->tm_year = 52;
- return rtc_data.rc;
+ return rc;
}
- if ((rtc_data.ce_msg.ce_msg[2] == 0xa9) ||
- (rtc_data.ce_msg.ce_msg[2] == 0xaf)) {
+ if ((ce_msg[2] == 0xa9) ||
+ (ce_msg[2] == 0xaf)) {
/* TOD clock is not set */
tm->tm_sec = 1;
tm->tm_min = 1;
@@ -736,7 +725,6 @@ int mf_get_rtc(struct rtc_time *tm)
mf_set_rtc(tm);
}
{
- u8 *ce_msg = rtc_data.ce_msg.ce_msg;
u8 year = ce_msg[5];
u8 sec = ce_msg[6];
u8 min = ce_msg[7];
@@ -765,6 +753,63 @@ int mf_get_rtc(struct rtc_time *tm)
return 0;
}
+int mf_get_rtc(struct rtc_time *tm)
+{
+ struct ce_msg_comp_data ce_complete;
+ struct rtc_time_data rtc_data;
+ int rc;
+
+ memset(&ce_complete, 0, sizeof(ce_complete));
+ memset(&rtc_data, 0, sizeof(rtc_data));
+ init_completion(&rtc_data.com);
+ ce_complete.handler = &get_rtc_time_complete;
+ ce_complete.token = &rtc_data;
+ rc = signal_ce_msg_simple(0x40, &ce_complete);
+ if (rc)
+ return rc;
+ wait_for_completion(&rtc_data.com);
+ return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
+}
+
+struct boot_rtc_time_data {
+ int busy;
+ struct ce_msg_data ce_msg;
+ int rc;
+};
+
+static void get_boot_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
+{
+ struct boot_rtc_time_data *rtc = token;
+
+ memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
+ rtc->rc = 0;
+ rtc->busy = 0;
+}
+
+int mf_get_boot_rtc(struct rtc_time *tm)
+{
+ struct ce_msg_comp_data ce_complete;
+ struct boot_rtc_time_data rtc_data;
+ int rc;
+
+ memset(&ce_complete, 0, sizeof(ce_complete));
+ memset(&rtc_data, 0, sizeof(rtc_data));
+ rtc_data.busy = 1;
+ ce_complete.handler = &get_boot_rtc_time_complete;
+ ce_complete.token = &rtc_data;
+ rc = signal_ce_msg_simple(0x40, &ce_complete);
+ if (rc)
+ return rc;
+ /* We need to poll here as we are not yet taking interrupts */
+ while (rtc_data.busy) {
+ extern unsigned long lpevent_count;
+ struct ItLpQueue *lpq = get_paca()->lpqueue_ptr;
+ if (lpq && ItLpQueue_isLpIntPending(lpq))
+ lpevent_count += ItLpQueue_process(lpq, NULL);
+ }
+ return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
+}
+
int mf_set_rtc(struct rtc_time *tm)
{
char ce_time[12];
diff --git a/arch/ppc64/kernel/rtc.c b/arch/ppc64/kernel/rtc.c
index 3e70b91375f..67989055a9f 100644
--- a/arch/ppc64/kernel/rtc.c
+++ b/arch/ppc64/kernel/rtc.c
@@ -292,47 +292,10 @@ int iSeries_set_rtc_time(struct rtc_time *tm)
void iSeries_get_boot_time(struct rtc_time *tm)
{
- unsigned long time;
- static unsigned long lastsec = 1;
-
- u32 dataWord1 = *((u32 *)(&xSpCommArea.xBcdTimeAtIplStart));
- u32 dataWord2 = *(((u32 *)&(xSpCommArea.xBcdTimeAtIplStart)) + 1);
- int year = 1970;
- int year1 = ( dataWord1 >> 24 ) & 0x000000FF;
- int year2 = ( dataWord1 >> 16 ) & 0x000000FF;
- int sec = ( dataWord1 >> 8 ) & 0x000000FF;
- int min = dataWord1 & 0x000000FF;
- int hour = ( dataWord2 >> 24 ) & 0x000000FF;
- int day = ( dataWord2 >> 8 ) & 0x000000FF;
- int mon = dataWord2 & 0x000000FF;
-
if ( piranha_simulator )
return;
- BCD_TO_BIN(sec);
- BCD_TO_BIN(min);
- BCD_TO_BIN(hour);
- BCD_TO_BIN(day);
- BCD_TO_BIN(mon);
- BCD_TO_BIN(year1);
- BCD_TO_BIN(year2);
- year = year1 * 100 + year2;
-
- time = mktime(year, mon, day, hour, min, sec);
- time += ( jiffies / HZ );
-
- /* Now THIS is a nasty hack!
- * It ensures that the first two calls get different answers.
- * That way the loop in init_time (time.c) will not think
- * the clock is stuck.
- */
- if ( lastsec ) {
- time -= lastsec;
- --lastsec;
- }
-
- to_tm(time, tm);
- tm->tm_year -= 1900;
+ mf_get_boot_rtc(tm);
tm->tm_mon -= 1;
}
#endif
diff --git a/include/asm-ppc64/iSeries/mf.h b/include/asm-ppc64/iSeries/mf.h
index 2e59a8e15a0..db333e1ee21 100644
--- a/include/asm-ppc64/iSeries/mf.h
+++ b/include/asm-ppc64/iSeries/mf.h
@@ -52,6 +52,7 @@ extern void mf_clear_src(void);
extern void mf_init(void);
extern int mf_get_rtc(struct rtc_time *tm);
+extern int mf_get_boot_rtc(struct rtc_time *tm);
extern int mf_set_rtc(struct rtc_time *tm);
#endif /* _ASM_PPC64_ISERIES_MF_H */