From 4770ba2827a5c582c6376139f1ec2d10519779e2 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Dan=20Hor=C3=A1k?= <dan@danny.cz>
Date: Fri, 13 Nov 2009 10:48:17 +0100
Subject: [PATCH 13/14] zipl - handle status during ipl
Description: zipl: handle status during ipl
Symptom: You encounter an error during IPL with "disabled wait" message.
Problem: During the IPL sequence the subchannel of the IPL device has
to be enabled. If there is a status pending or busy condition
on the subchannel the IPL code abborts the IPL and goes into
disabled wait.
Solution: To resolve the problem the IPL code accepts the status pending
or busy condition on the subchannel and does up to 256 retries.
---
zipl/boot/common.S | 65 ++++++++++++++++++++++++++++++++++-----------------
1 files changed, 43 insertions(+), 22 deletions(-)
diff --git a/zipl/boot/common.S b/zipl/boot/common.S
index 620fed9..fa45e5a 100644
--- a/zipl/boot/common.S
+++ b/zipl/boot/common.S
@@ -6,6 +6,7 @@
#
# some definitions from kernel land
+__LC_IRB = 0x0300
__LC_IPLDEV = 0xC6C
__LC_PANIC_MAGIC= 0xE00
@@ -186,23 +187,33 @@ _load_blocklist:
_enable_device:
stm %r6,%r15,24(%r15)
basr %r13,0 # base register
-0: s %r15,1f-0b(%r13)
+0: s %r15,4f-0b(%r13)
lr %r1,%r2
- l %r2,4f-0b(%r13) # set panik code early
- stsch 2f-0b(%r13)
- oi 2f-0b+5(%r13),0x84 # enable ssch and multipath mode
- msch 2f-0b(%r13)
- bnz _panik-0b(%r13) # subchannel busy or in error ?
- lctl %c6,%c6,3f-0b(%r13) # enable all interrupt classes
+ l %r2,7f-0b(%r13) # set panik code early
+ stsch 5f-0b(%r13)
+ brc 1,3f # panic if not operational
+ oi 5f-0b+5(%r13),0x80 # enable subchannel
+ lhi %r6,256 # r6 retry counter
+1: # modify subchannel
+ msch 5f-0b(%r13)
+ brc 6,2f # status pending or busy
+ brc 1,3f # panic if not operational
+ lctl %c6,%c6,6f-0b(%r13) # enable all interrupt classes
sr %r2,%r2
- ic %r2,10+2f-0b(%r13) # return lpum in r2
+ ic %r2,10+5f-0b(%r13) # return lpum in r2
lm %r6,%r15,120(%r15)
br %r14
-1: .long 96
+2: # clear status and retry
+ tsch __LC_IRB
+ brc 1,3f # panic if not operational
+ brct %r6,1b # retry
+3: # panic
+ b _panik-0b(%r13) # panic
+4: .long 96
.align 8
-2: .fill 64,1,0
-3: .long 0xff000000 # CR6 initial value
-4: .long EENABLE_DEV
+5: .fill 64,1,0
+6: .long 0xff000000 # CR6 initial value
+7: .long EENABLE_DEV
#
# Disable I/O on the ipl device.
@@ -211,20 +222,30 @@ _enable_device:
_disable_device:
stm %r6,%r15,24(%r15)
basr %r13,0 # base register
-0: s %r15,1f-0b(%r13)
+0: s %r15,4f-0b(%r13)
lr %r1,%r2
- l %r2,3f-0b(%r13) # set panik code early
- lctl %c6,%c6,2f-0b(%r13) # disable all interrupt classes
- stsch 2f-0b(%r13)
- ni 2f-0b+5(%r13),0x7B # disable ssch and multipath mode
- msch 2f-0b(%r13)
- bnz _panik-0b(%r13) # subchannel busy or in error ?
+ l %r2,6f-0b(%r13) # set panik code early
+ lctl %c6,%c6,5f-0b(%r13) # disable all interrupt classes
+ stsch 5f-0b(%r13)
+ brc 1,3f # panic if not operational
+ ni 5f-0b+5(%r13),0x7F # disable subchannel
+ lhi %r6,256 # r6 retry counter
+1: # modify subchannel
+ msch 5f-0b(%r13)
+ brc 6,2f # status pending or busy
+ brc 1,3f # panic if not operational
lm %r6,%r15,120(%r15)
br %r14
-1: .long 96
+2: # clear status and retry
+ tsch __LC_IRB
+ brc 1,3f # panic if not operational
+ brct %r6,1b
+3: # panic
+ b _panik-0b(%r13) # panic
+4: .long 96
.align 8
-2: .long 0x00000000 # CR6 (all interrupts classes disabled)
-3: .long EDISABLE_DEV
+5: .long 0x00000000 # CR6 (all interrupts classes disabled)
+6: .long EDISABLE_DEV
.endm
.macro io_subroutines
--
1.6.3.3