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| author |   Nicholas Piggin <npiggin@gmail.com> | 2021-11-29 13:09:15 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-11-30 22:27:07 +1100 |
| commit | 5402e239d09feea482d25d60df9b908cfaf9ec3c (patch) | |
| tree | 0baed78e911ab2e3ecad64e0034dce5dfb9b1f6f /arch/powerpc/mm/book3s64/pgtable.c | |
| parent | powerpc/perf: Fix PMU callbacks to clear pending PMI before resetting an overflown PMC (diff) | |
| download | linux-dev-5402e239d09feea482d25d60df9b908cfaf9ec3c.tar.xz linux-dev-5402e239d09feea482d25d60df9b908cfaf9ec3c.zip | |
powerpc/64s: Get LPID bit width from device tree
Allow the LPID bit width and partition table size to be set at runtime
from the device tree.
Move the PID bit width detection into the same place.
KVM does not support using the extra bits yet, this is mainly required
to get the PTCR register values correct (so KVM will run but it will
not allocate > 4096 LPIDs).
OPAL firmware provides this property for POWER10 CPUs since skiboot
commit 9b85f7d961f2 ("hdata: add mmu-pid-bits and mmu-lpid-bits for
POWER10 CPUs").
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211129030915.1888332-1-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/mm/book3s64/pgtable.c')
| -rw-r--r-- | arch/powerpc/mm/book3s64/pgtable.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 9e16c7b1a6c5..13d1fbddecb9 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -207,17 +207,12 @@ void __init mmu_partition_table_init(void) unsigned long patb_size = 1UL << PATB_SIZE_SHIFT; unsigned long ptcr; - BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large."); /* Initialize the Partition Table with no entries */ partition_tb = memblock_alloc(patb_size, patb_size); if (!partition_tb) panic("%s: Failed to allocate %lu bytes align=0x%lx\n", __func__, patb_size, patb_size); - /* - * update partition table control register, - * 64 K size. - */ ptcr = __pa(partition_tb) | (PATB_SIZE_SHIFT - 12); set_ptcr_when_no_uv(ptcr); powernv_set_nmmu_ptcr(ptcr); |