diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2017-03-22 09:06:57 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-31 23:10:01 +1100 |
| commit | f6eedbba7a26fdaee9ea8121336dc86236c136c7 (patch) | |
| tree | 31585ff52a0973eedbcbf0a887a9667ebdb04664 /arch/powerpc/include/asm/processor.h | |
| parent | 59248aecc4aea80c2c8b444ff8af9b894302a41d (diff) | |
powerpc/mm/hash: Increase VA range to 128TB
We update the hash linux page table layout such that we can support
512TB. But we limit the TASK_SIZE to 128TB. We can switch to 128TB by
default without conditional because that is the max virtual address
supported by other architectures. We will later add a mechanism to
on-demand increase the application's effective address range to 512TB.
Having the page table layout changed to accommodate 512TB makes testing
large memory configuration easier with less code changes to kernel
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index e0fecbcea2a2..ea4b6c696f1f 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -102,11 +102,25 @@ void release_thread(struct task_struct *); #endif #ifdef CONFIG_PPC64 -/* 64-bit user address space is 46-bits (64TB user VM) */ -#define TASK_SIZE_USER64 (0x0000400000000000UL) +/* + * 64-bit user address space can have multiple limits + * For now supported values are: + */ +#define TASK_SIZE_64TB (0x0000400000000000UL) +#define TASK_SIZE_128TB (0x0000800000000000UL) +#define TASK_SIZE_512TB (0x0002000000000000UL) -/* - * 32-bit user address space is 4GB - 1 page +#ifdef CONFIG_PPC_BOOK3S_64 +/* + * Max value currently used: + */ +#define TASK_SIZE_USER64 TASK_SIZE_128TB +#else +#define TASK_SIZE_USER64 TASK_SIZE_64TB +#endif + +/* + * 32-bit user address space is 4GB - 1 page * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT */ #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) |