6.12-stable review patch. If anyone has any objections, please let me know.
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From: Ritesh Harjani (IBM) ritesh.list@gmail.com
[ Upstream commit 17b45ccf09882e0c808ad2cf62acdc90ad968746 ]
When HV=0 & IR/DR=0, the Hash MMU is said to be in Virtual Real Addressing Mode during early boot. During this, we should ensure that memory region allocations for stress_hpt_struct should happen from within RMA region as otherwise the boot might get stuck while doing memset of this region.
History behind why do we have RMA region limitation is better explained in these 2 patches [1] & [2]. This patch ensures that memset to stress_hpt_struct during early boot does not cross ppc64_rma_size boundary.
[1]: https://lore.kernel.org/all/20190710052018.14628-1-sjitindarsingh@gmail.com/ [2]: https://lore.kernel.org/all/87wp54usvj.fsf@linux.vnet.ibm.com/
Fixes: 6b34a099faa12 ("powerpc/64s/hash: add stress_hpt kernel boot option to increase hash faults") Signed-off-by: Ritesh Harjani (IBM) ritesh.list@gmail.com Signed-off-by: Madhavan Srinivasan maddy@linux.ibm.com Link: https://patch.msgid.link/ada1173933ea7617a994d6ee3e54ced8797339fc.1761834163... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/mm/book3s64/hash_utils.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index e1eadd03f1339..9914d89f9db7d 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1039,11 +1039,14 @@ static void __init htab_initialize(void) unsigned long table; unsigned long pteg_count; unsigned long prot; - phys_addr_t base = 0, size = 0, end; + phys_addr_t base = 0, size = 0, end, limit = MEMBLOCK_ALLOC_ANYWHERE; u64 i;
DBG(" -> htab_initialize()\n");
+ if (firmware_has_feature(FW_FEATURE_LPAR)) + limit = ppc64_rma_size; + if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) { mmu_kernel_ssize = MMU_SEGSIZE_1T; mmu_highuser_ssize = MMU_SEGSIZE_1T; @@ -1059,7 +1062,7 @@ static void __init htab_initialize(void) // Too early to use nr_cpu_ids, so use NR_CPUS tmp = memblock_phys_alloc_range(sizeof(struct stress_hpt_struct) * NR_CPUS, __alignof__(struct stress_hpt_struct), - 0, MEMBLOCK_ALLOC_ANYWHERE); + MEMBLOCK_LOW_LIMIT, limit); memset((void *)tmp, 0xff, sizeof(struct stress_hpt_struct) * NR_CPUS); stress_hpt_struct = __va(tmp);
@@ -1093,7 +1096,6 @@ static void __init htab_initialize(void) mmu_hash_ops.hpte_clear_all(); #endif } else { - unsigned long limit = MEMBLOCK_ALLOC_ANYWHERE;
#ifdef CONFIG_PPC_CELL /* @@ -1109,7 +1111,7 @@ static void __init htab_initialize(void)
table = memblock_phys_alloc_range(htab_size_bytes, htab_size_bytes, - 0, limit); + MEMBLOCK_LOW_LIMIT, limit); if (!table) panic("ERROR: Failed to allocate %pa bytes below %pa\n", &htab_size_bytes, &limit);