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-rw-r--r--arch/sparc/include/asm/hugetlb.h1
-rw-r--r--arch/sparc/include/asm/page_64.h4
-rw-r--r--arch/sparc/kernel/tsb.S39
-rw-r--r--arch/sparc/mm/fault_64.c9
-rw-r--r--arch/sparc/mm/init_64.c24
-rw-r--r--arch/sparc/mm/tlb.c11
6 files changed, 72 insertions, 16 deletions
diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
index 9661e9bc7bb6..7eb57d245044 100644
--- a/arch/sparc/include/asm/hugetlb.h
+++ b/arch/sparc/include/asm/hugetlb.h
@@ -12,7 +12,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
{
- hugetlb_setup(mm);
}
static inline int is_hugepage_only_range(struct mm_struct *mm,
diff --git a/arch/sparc/include/asm/page_64.h b/arch/sparc/include/asm/page_64.h
index 4b39f74d6ca0..e15538899f3d 100644
--- a/arch/sparc/include/asm/page_64.h
+++ b/arch/sparc/include/asm/page_64.h
@@ -27,8 +27,8 @@
#ifndef __ASSEMBLY__
#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
-struct mm_struct;
-extern void hugetlb_setup(struct mm_struct *mm);
+struct pt_regs;
+extern void hugetlb_setup(struct pt_regs *regs);
#endif
#define WANT_PAGE_VIRTUAL
diff --git a/arch/sparc/kernel/tsb.S b/arch/sparc/kernel/tsb.S
index d4bdc7a62375..a313e4a9399b 100644
--- a/arch/sparc/kernel/tsb.S
+++ b/arch/sparc/kernel/tsb.S
@@ -136,12 +136,43 @@ tsb_miss_page_table_walk_sun4v_fastpath:
nop
/* It is a huge page, use huge page TSB entry address we
- * calculated above.
+ * calculated above. If the huge page TSB has not been
+ * allocated, setup a trap stack and call hugetlb_setup()
+ * to do so, then return from the trap to replay the TLB
+ * miss.
+ *
+ * This is necessary to handle the case of transparent huge
+ * pages where we don't really have a non-atomic context
+ * in which to allocate the hugepage TSB hash table. When
+ * the 'mm' faults in the hugepage for the first time, we
+ * thus handle it here. This also makes sure that we can
+ * allocate the TSB hash table on the correct NUMA node.
*/
TRAP_LOAD_TRAP_BLOCK(%g7, %g2)
- ldx [%g7 + TRAP_PER_CPU_TSB_HUGE_TEMP], %g2
- cmp %g2, -1
- movne %xcc, %g2, %g1
+ ldx [%g7 + TRAP_PER_CPU_TSB_HUGE_TEMP], %g1
+ cmp %g1, -1
+ bne,pt %xcc, 60f
+ nop
+
+661: rdpr %pstate, %g5
+ wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
+ .section .sun4v_2insn_patch, "ax"
+ .word 661b
+ SET_GL(1)
+ nop
+ .previous
+
+ rdpr %tl, %g3
+ cmp %g3, 1
+ bne,pn %xcc, winfix_trampoline
+ nop
+ ba,pt %xcc, etrap
+ rd %pc, %g7
+ call hugetlb_setup
+ add %sp, PTREGS_OFF, %o0
+ ba,pt %xcc, rtrap
+ nop
+
60:
#endif
diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c
index 097aee763af3..5062ff389e83 100644
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -472,8 +472,13 @@ good_area:
#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
mm_rss = mm->context.huge_pte_count;
if (unlikely(mm_rss >
- mm->context.tsb_block[MM_TSB_HUGE].tsb_rss_limit))
- tsb_grow(mm, MM_TSB_HUGE, mm_rss);
+ mm->context.tsb_block[MM_TSB_HUGE].tsb_rss_limit)) {
+ if (mm->context.tsb_block[MM_TSB_HUGE].tsb)
+ tsb_grow(mm, MM_TSB_HUGE, mm_rss);
+ else
+ hugetlb_setup(regs);
+
+ }
#endif
return;
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 0d0bc392c35f..82bbf048a5b0 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2718,14 +2718,28 @@ static void context_reload(void *__data)
load_secondary_context(mm);
}
-void hugetlb_setup(struct mm_struct *mm)
+void hugetlb_setup(struct pt_regs *regs)
{
- struct tsb_config *tp = &mm->context.tsb_block[MM_TSB_HUGE];
+ struct mm_struct *mm = current->mm;
+ struct tsb_config *tp;
- if (likely(tp->tsb != NULL))
- return;
+ if (in_atomic() || !mm) {
+ const struct exception_table_entry *entry;
+
+ entry = search_exception_tables(regs->tpc);
+ if (entry) {
+ regs->tpc = entry->fixup;
+ regs->tnpc = regs->tpc + 4;
+ return;
+ }
+ pr_alert("Unexpected HugeTLB setup in atomic context.\n");
+ die_if_kernel("HugeTSB in atomic", regs);
+ }
+
+ tp = &mm->context.tsb_block[MM_TSB_HUGE];
+ if (likely(tp->tsb == NULL))
+ tsb_grow(mm, MM_TSB_HUGE, 0);
- tsb_grow(mm, MM_TSB_HUGE, 0);
tsb_context_switch(mm);
smp_tsb_sync(mm);
diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
index 3e8fec391fe0..ba6ae7ffdc2c 100644
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -135,8 +135,15 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
mm->context.huge_pte_count++;
else
mm->context.huge_pte_count--;
- if (mm->context.huge_pte_count == 1)
- hugetlb_setup(mm);
+
+ /* Do not try to allocate the TSB hash table if we
+ * don't have one already. We have various locks held
+ * and thus we'll end up doing a GFP_KERNEL allocation
+ * in an atomic context.
+ *
+ * Instead, we let the first TLB miss on a hugepage
+ * take care of this.
+ */
}
if (!pmd_none(orig)) {