I've been trying to diagnose this panic on a pa8800 box with git head:
LBA: Truncating lmmio_space [fffffffff0000000/fffffffffecffffe] to
[fffffffff0000000,fffffffffe77ffff]
powersw: Soft power switch support not available.
Backtrace:
[<000000004011c7a0>] real32_call+0x148/0x178
[<000000004013ec7c>] enqueue_task_fair+0x6c/0xb0
[<000000004013f418>] update_rq_clock+0x30/0x48
[<000000004013e800>] set_next_entity+0x38/0x70
[<000000004016dca0>] autoremove_wake_function+0x18/0x48
[<00000000401bbda4>] cache_alloc_debugcheck_after+0x24c/0x300
[<000000004025c500>] kobject_uevent_env+0x418/0x5a8
[<000000004025b10c>] kobject_put+0x24/0x30
[<000000004015af60>] __sysctl_head_next+0x78/0x120
[<0000000040174234>] sysctl_check_table+0x494/0x938
[<000000004015b078>] sysctl_head_finish+0x40/0x60
[<000000004011c7a0>] real32_call+0x148/0x178
[<000000004013e3f8>] calc_delta_mine+0x68/0xf8
[<000000004018621c>] touch_softlockup_watchdog+0x3c/0x50
[<000000004014a66c>] task_tick_fair+0x84/0xf0
[<0000000040186720>] softlockup_tick+0x128/0x1c0
Kernel Fault: Code=26 regs=000000007f46c7d0 (Addr=0000000000000158)
YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00001000000001000000000000001111 Not tainted
r00-03 000000000804000f 0000000040583be0 0000000040104084 000000007f46c290
r04-07 000000004057f3e0 000000007f46c360 0000000000000000 000000007f44e040
r08-11 00000000404d7dc0 0000000000000000 000000007f44e288 00000000405bc340
r12-15 0000000000000001 00000000405bbc00 0000000040447300 0000000000000001
r16-19 000000007f46c360 00000000404dc400 00000000405bc340 0000000000000000
r20-23 000000007f46c290 0000000000000000 0000000000000310 0000000000000000
r24-27 0000000000000000 000000007f46c360 00000000403d5030 000000004057f3e0
r28-31 000000007f46c000 000000007f46c690 000000007f46c7d0 000000007f46c000
sr00-03 0000000000000000 0000000000000000 0000000000000000 0000000000000000
sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000
IASQ: 0000000000000000 0000000000000000 IAOQ: 000000004011af54 000000004011af58
IIR: 4a7702b0 ISR: 0000000000000000 IOR: 0000000000000158
CPU: 0 CR30: 000000007f46c000 CR31: fffffff0f0e098e0
ORIG_R28: 000000004013e3f8
IAOQ[0]: handle_interruption+0x804/0x890
IAOQ[1]: handle_interruption+0x808/0x890
RP(r2): intr_check_sig+0x0/0x38
The reason is actually that %cr30 is NULL, which should be an
impossibility. However, all the real32_call() places in the trace
intrigued me because they shouldn't happen on a pa8800 ... it has only
wide firmware, so only 64 bit realmode calls can work.
It transpires that the way we call PDC console constantly causes these
real32_call() calls to be invoked leading to the panic. Sure enough, if
I scrub them out of my build with the attached patch, the panic goes and
git head boots just fine.
James
diff --git a/arch/parisc/kernel/Makefile b/arch/parisc/kernel/Makefile
index 27827bc..7ddf756 100644
--- a/arch/parisc/kernel/Makefile
+++ b/arch/parisc/kernel/Makefile
@@ -11,10 +11,11 @@ obj-y := cache.o pacache.o setup.o traps.o
time.o irq.o \
pa7300lc.o syscall.o entry.o sys_parisc.o firmware.o \
ptrace.o hardware.o inventory.o drivers.o semaphore.o \
signal.o hpmc.o real2.o parisc_ksyms.o unaligned.o \
- process.o processor.o pdc_cons.o pdc_chassis.o unwind.o \
+ process.o processor.o pdc_chassis.o unwind.o \
topology.o
obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_PDC_CONSOLE) += pdc_cons.o
obj-$(CONFIG_PA11) += pci-dma.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_MODULES) += module.o
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c
index 4ab83d5..378bc61 100644
--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -1080,7 +1080,7 @@ void pdc_io_reset_devices(void)
spin_unlock_irqrestore(&pdc_lock, flags);
}
-
+#ifdef CONFIG_PDC_CONSOLE
/**
* pdc_iodc_print - Console print using IODC.
* @str: the string to output.
@@ -1168,7 +1168,9 @@ int pdc_iodc_getc(void)
return ch;
}
+#endif
+#ifdef CONFIG_FB_STI
int pdc_sti_call(unsigned long func, unsigned long flags,
unsigned long inptr, unsigned long outputr,
unsigned long glob_cfg)
@@ -1183,6 +1185,7 @@ int pdc_sti_call(unsigned long func, unsigned long flags,
return retval;
}
EXPORT_SYMBOL(pdc_sti_call);
+#endif
#ifdef CONFIG_64BIT
/**
@@ -1375,7 +1378,6 @@ int pdc_pat_io_pci_cfg_write(unsigned long pci_addr, int
pci_size, u32 val)
* to overlay real_stack (real2.S), preparing a 32-bit call frame.
* real32_call_asm() then uses this stack in narrow real mode
*/
-
struct narrow_stack {
/* use int, not long which is 64 bits */
unsigned int arg13;
@@ -1404,6 +1406,14 @@ long real32_call(unsigned long fn, ...)
extern unsigned long real32_call_asm(unsigned int *,
unsigned int *,
unsigned int);
+
+ /* Calling real32_call without narrow firmware is a serious
+ * problem and can lead to crashes */
+ if (unlikely(!parisc_narrow_firmware)) {
+ printk(KERN_ERR "Invalid call to 32 bit firmware\n");
+ WARN_ON(1);
+ return -EINVAL;
+ }
va_start(args, fn);
real_stack.arg0 = va_arg(args, unsigned int);
diff --git a/include/asm-parisc/pdc.h b/include/asm-parisc/pdc.h
index deda8c3..d11aabb 100644
--- a/include/asm-parisc/pdc.h
+++ b/include/asm-parisc/pdc.h
@@ -588,8 +588,13 @@ struct pdc_hpmc_pim_20 { /* PDC_PIM */
__u64 fr[32];
};
+#ifdef CONFIG_PDC_CONSOLE
void pdc_console_init(void); /* in pdc_console.c */
void pdc_console_restart(void);
+#else
+static inline void pdc_console_init(void) { }
+static inline void pdc_console_restart(void) { }
+#endif
void setup_pdc(void); /* in inventory.c */
-
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