From: Meelis Roos <mroos@xxxxxxxx>
Date: Wed, 7 May 2014 01:41:08 +0300 (EEST)
>> > How should I continue debugging it - find the conf differences with
>> > Debian kernel?
>> >
>> > Or do you want my .config for U2, X1, V100?
>>
>> I think the pattern is that the UltraSPARC-III based machines have
>> no problems, whereas the UltraSPARC-I and UltraSPARC-II based ones
>> tend to crash and hang.
>
> Will try V210/V240/V440/T2000 when I get time.
>
>> You said they have the same problem with THP disabled too, right?
>
> U1/U2/E220R/E420R/E250/E450/E3500 were stable with THP off for my
> dist-upgrade+compile test, Netra X1 and V100 had ocassional trouble. Of
> these, one might have had THP set to madvise.
I think I found the bug and it's been there forever, please try this patch:
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index fde5aba..1a49ffd 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -24,7 +24,8 @@
/* The kernel image occupies 0x4000000 to 0x6000000 (4MB --> 96MB).
* The page copy blockops can use 0x6000000 to 0x8000000.
- * The TSB is mapped in the 0x8000000 to 0xa000000 range.
+ * The 8K TSB is mapped in the 0x8000000 to 0x8400000 range.
+ * The 4M TSB is mapped in the 0x8400000 to 0x8800000 range.
* The PROM resides in an area spanning 0xf0000000 to 0x100000000.
* The vmalloc area spans 0x100000000 to 0x200000000.
* Since modules need to be in the lowest 32-bits of the address space,
@@ -33,7 +34,8 @@
* 0x400000000.
*/
#define TLBTEMP_BASE _AC(0x0000000006000000,UL)
-#define TSBMAP_BASE _AC(0x0000000008000000,UL)
+#define TSBMAP_8K_BASE _AC(0x0000000008000000,UL)
+#define TSBMAP_4M_BASE _AC(0x0000000008400000,UL)
#define MODULES_VADDR _AC(0x0000000010000000,UL)
#define MODULES_LEN _AC(0x00000000e0000000,UL)
#define MODULES_END _AC(0x00000000f0000000,UL)
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index f5d506f..241d47a 100644
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c
@@ -133,7 +133,17 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_idx, unsign
mm->context.tsb_block[tsb_idx].tsb_nentries =
tsb_bytes / sizeof(struct tsb);
- base = TSBMAP_BASE;
+ switch (tsb_idx) {
+ case MM_TSB_BASE:
+ base = TSBMAP_8K_BASE;
+ break;
+ case MM_TSB_HUGE:
+ base = TSBMAP_4M_BASE;
+ break;
+ default:
+ BUG();
+ }
+
tte = pgprot_val(PAGE_KERNEL_LOCKED);
tsb_paddr = __pa(mm->context.tsb_block[tsb_idx].tsb);
BUG_ON(tsb_paddr & (tsb_bytes - 1UL));
--
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