[v5 2/6] powerpc/mce: Fix MCE handling for huge pages

[Santosh Sivaraj]

From: Balbir Singh <bsingharora@xxxxxxxxx>

The current code would fail on huge pages addresses, since the shift
would be incorrect. Use the correct page shift value returned by
__find_linux_pte() to get the correct pfn. The code is more generic
and can handle both regular and compound pages.

Fixes: ba41e1e1ccb9 ("powerpc/mce: Hookup derror (load/store) UE errors")

Signed-off-by: Balbir Singh <bsingharora@xxxxxxxxx>
[arbab@xxxxxxxxxxxxx: Fixup pseries_do_memory_failure()]
Signed-off-by: Reza Arbab <arbab@xxxxxxxxxxxxx>
Signed-off-by: Santosh Sivaraj <santosh@xxxxxxxxxx>
---
 arch/powerpc/include/asm/mce.h       |  3 ++-
 arch/powerpc/kernel/mce_power.c      | 26 ++++++++++++++++----------
 arch/powerpc/platforms/pseries/ras.c |  6 ++++--
 3 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h
index a4c6a74ad2fb..94888a7025b3 100644
--- a/arch/powerpc/include/asm/mce.h
+++ b/arch/powerpc/include/asm/mce.h
@@ -209,7 +209,8 @@ extern void release_mce_event(void);
 extern void machine_check_queue_event(void);
 extern void machine_check_print_event_info(struct machine_check_event *evt,
 					   bool user_mode, bool in_guest);
-unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr);
+unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr,
+			  unsigned int *shift);
 #ifdef CONFIG_PPC_BOOK3S_64
 void flush_and_reload_slb(void);
 #endif /* CONFIG_PPC_BOOK3S_64 */
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c
index e39536aad30d..04666c0b40a8 100644
--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -23,7 +23,8 @@
  * Convert an address related to an mm to a PFN. NOTE: we are in real
  * mode, we could potentially race with page table updates.
  */
-unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
+unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr,
+			  unsigned int *shift)
 {
 	pte_t *ptep;
 	unsigned long flags;
@@ -36,13 +37,15 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
 
 	local_irq_save(flags);
 	if (mm == current->mm)
-		ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
+		ptep = find_current_mm_pte(mm->pgd, addr, NULL, shift);
 	else
-		ptep = find_init_mm_pte(addr, NULL);
+		ptep = find_init_mm_pte(addr, shift);
 	local_irq_restore(flags);
 	if (!ptep || pte_special(*ptep))
 		return ULONG_MAX;
-	return pte_pfn(*ptep);
+	if (!*shift)
+		*shift = PAGE_SHIFT;
+	return (pte_val(*ptep) & PTE_RPN_MASK) >> *shift;
 }
 
 /* flush SLBs and reload */
@@ -358,15 +361,16 @@ static int mce_find_instr_ea_and_pfn(struct pt_regs *regs, uint64_t *addr,
 	unsigned long pfn, instr_addr;
 	struct instruction_op op;
 	struct pt_regs tmp = *regs;
+	unsigned int shift;
 
-	pfn = addr_to_pfn(regs, regs->nip);
+	pfn = addr_to_pfn(regs, regs->nip, &shift);
 	if (pfn != ULONG_MAX) {
-		instr_addr = (pfn << PAGE_SHIFT) + (regs->nip & ~PAGE_MASK);
+		instr_addr = (pfn << shift) + (regs->nip & ((1 << shift) - 1));
 		instr = *(unsigned int *)(instr_addr);
 		if (!analyse_instr(&op, &tmp, instr)) {
-			pfn = addr_to_pfn(regs, op.ea);
+			pfn = addr_to_pfn(regs, op.ea, &shift);
 			*addr = op.ea;
-			*phys_addr = (pfn << PAGE_SHIFT);
+			*phys_addr = (pfn << shift);
 			return 0;
 		}
 		/*
@@ -442,12 +446,14 @@ static int mce_handle_ierror(struct pt_regs *regs,
 			if (mce_err->sync_error &&
 				table[i].error_type == MCE_ERROR_TYPE_UE) {
 				unsigned long pfn;
+				unsigned int shift;
 
 				if (get_paca()->in_mce < MAX_MCE_DEPTH) {
-					pfn = addr_to_pfn(regs, regs->nip);
+					pfn = addr_to_pfn(regs, regs->nip,
+							  &shift);
 					if (pfn != ULONG_MAX) {
 						*phys_addr =
-							(pfn << PAGE_SHIFT);
+							(pfn << shift);
 					}
 				}
 			}
diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index f16fdd0f71f7..5e43283d3300 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -740,12 +740,14 @@ static void pseries_do_memory_failure(struct pt_regs *regs,
 		paddr = be64_to_cpu(mce_log->logical_address);
 	} else if (mce_log->sub_err_type & UE_EFFECTIVE_ADDR_PROVIDED) {
 		unsigned long pfn;
+		unsigned int shift;
 
 		pfn = addr_to_pfn(regs,
-				  be64_to_cpu(mce_log->effective_address));
+				  be64_to_cpu(mce_log->effective_address),
+				  &shift);
 		if (pfn == ULONG_MAX)
 			return;
-		paddr = pfn << PAGE_SHIFT;
+		paddr = pfn << shift;
 	} else {
 		return;
 	}
-- 
2.20.1