diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2017-12-22 14:17:08 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-17 16:41:44 +0300 |
| commit | 1513c33d7174e87a079cfa2666cb9a3eba56a0ea (patch) | |
| tree | 26e7b07427095f5f7a30cf03f81ed1ee332a10f8 /arch/powerpc/mm/hash_utils_64.c | |
| parent | d4748276ae14ce951a3254852dddc3675797c277 (diff) | |
| download | linux-1513c33d7174e87a079cfa2666cb9a3eba56a0ea.tar.xz | |
powerpc/powernv: Remove real mode access limit for early allocations
This removes the RMA limit on powernv platform, which constrains
early allocations such as PACAs and stacks. There are still other
restrictions that must be followed, such as bolted SLB limits, but
real mode addressing has no constraints.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 69fa01e02b63..a386bd854b1c 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1848,16 +1848,22 @@ void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base, */ BUG_ON(first_memblock_base != 0); - /* On LPAR systems, the first entry is our RMA region, - * non-LPAR 64-bit hash MMU systems don't have a limitation - * on real mode access, but using the first entry works well - * enough. We also clamp it to 1G to avoid some funky things + /* + * On virtualized systems the first entry is our RMA region aka VRMA, + * non-virtualized 64-bit hash MMU systems don't have a limitation + * on real mode access. + * + * We also clamp it to 1G to avoid some funky things * such as RTAS bugs etc... */ - ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000); + if (!early_cpu_has_feature(CPU_FTR_HVMODE)) { + ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000); - /* Finally limit subsequent allocations */ - memblock_set_current_limit(ppc64_rma_size); + /* Finally limit subsequent allocations */ + memblock_set_current_limit(ppc64_rma_size); + } else { + ppc64_rma_size = ULONG_MAX; + } } #ifdef CONFIG_DEBUG_FS |