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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-12-01 15:41:51 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-12-09 12:40:24 +0100 |
| commit | c28573744b74eb6de19add503d6a986795c4c137 (patch) | |
| tree | a0e01828ce7e0e92ed571d5c0ed3ca471756c47b /arch/powerpc/mm/init_64.c | |
| parent | powerpc/64s: Always define arch unmapped area calls (diff) | |
| download | linux-c28573744b74eb6de19add503d6a986795c4c137.tar.xz linux-c28573744b74eb6de19add503d6a986795c4c137.zip | |
powerpc/64s: Make hash MMU support configurable
This adds Kconfig selection which allows 64s hash MMU support to be
disabled. It can be disabled if radix support is enabled, the minimum
supported CPU type is POWER9 (or higher), and KVM is not selected.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211201144153.2456614-17-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/mm/init_64.c')
| -rw-r--r-- | arch/powerpc/mm/init_64.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 3e5f9ac9dded..35f46bf54281 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -472,8 +472,12 @@ void __init mmu_early_init_devtree(void) bool hvmode = !!(mfmsr() & MSR_HV); /* Disable radix mode based on kernel command line. */ - if (disable_radix) - cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; + if (disable_radix) { + if (IS_ENABLED(CONFIG_PPC_64S_HASH_MMU)) + cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX; + else + pr_warn("WARNING: Ignoring cmdline option disable_radix\n"); + } of_scan_flat_dt(dt_scan_mmu_pid_width, NULL); if (hvmode && !mmu_lpid_bits) { @@ -498,6 +502,7 @@ void __init mmu_early_init_devtree(void) if (early_radix_enabled()) { radix__early_init_devtree(); + /* * We have finalized the translation we are going to use by now. * Radix mode is not limited by RMA / VRMA addressing. @@ -507,5 +512,9 @@ void __init mmu_early_init_devtree(void) memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); } else hash__early_init_devtree(); + + if (!(cur_cpu_spec->mmu_features & MMU_FTR_HPTE_TABLE) && + !(cur_cpu_spec->mmu_features & MMU_FTR_TYPE_RADIX)) + panic("kernel does not support any MMU type offered by platform"); } #endif /* CONFIG_PPC_BOOK3S_64 */ |