From 6553fb799f601497ca0703682e2aff131197dc5c Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Date: Mon, 10 Aug 2020 15:56:23 +0530
Subject: [PATCH] powerpc/pkeys: Fix boot failures with Nemo board (A-EON
AmigaOne X1000)
References: jsc#SLE-16556 bsc#1078248 FATE#322447
Patch-mainline: v5.9-rc1
Git-commit: 6553fb799f601497ca0703682e2aff131197dc5c
On p6 and before we should avoid updating UAMOR SPRN. This resulted
in boot failure on Nemo board.
Fixes: 269e829f48a0 ("powerpc/book3s64/pkey: Disable pkey on POWER6 and before")
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200810102623.685083-1-aneesh.kumar@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/mm/book3s64/hash_utils.c | 5 ++---
arch/powerpc/mm/book3s64/pkeys.c | 12 ++++++------
2 files changed, 8 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 1478fceeb683..1da9dbba9217 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -1115,9 +1115,8 @@ void hash__early_init_mmu_secondary(void)
&& cpu_has_feature(CPU_FTR_HVMODE))
tlbiel_all();
-#ifdef CONFIG_PPC_MEM_KEYS
- mtspr(SPRN_UAMOR, default_uamor);
-#endif
+ if (IS_ENABLED(CONFIG_PPC_MEM_KEYS) && mmu_has_feature(MMU_FTR_PKEY))
+ mtspr(SPRN_UAMOR, default_uamor);
}
#endif /* CONFIG_SMP */
diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c
index 69a6b87f2bb4..b1d091a97611 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c
@@ -73,12 +73,6 @@ static int scan_pkey_feature(void)
if (early_radix_enabled())
return 0;
- /*
- * Only P7 and above supports SPRN_AMR update with MSR[PR] = 1
- */
- if (!early_cpu_has_feature(CPU_FTR_ARCH_206))
- return 0;
-
ret = of_scan_flat_dt(dt_scan_storage_keys, &pkeys_total);
if (ret == 0) {
/*
@@ -124,6 +118,12 @@ void __init pkey_early_init_devtree(void)
__builtin_popcountl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT)
!= (sizeof(u64) * BITS_PER_BYTE));
+ /*
+ * Only P7 and above supports SPRN_AMR update with MSR[PR] = 1
+ */
+ if (!early_cpu_has_feature(CPU_FTR_ARCH_206))
+ return;
+
/* scan the device tree for pkey feature */
pkeys_total = scan_pkey_feature();
if (!pkeys_total)
--
2.28.0