diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2019-08-28 15:40:54 -0600 |
|---|---|---|
| committer | Paul Walmsley <paul.walmsley@sifive.com> | 2019-08-30 11:10:37 -0700 |
| commit | d95f1a542c3df396137afa217ef9bd39cb8931ca (patch) | |
| tree | c3589a3d0c784429b607bb7ceac24db04e31c1d7 /arch/riscv/Kconfig | |
| parent | 4f3f90084673fa1d7f8e81b9dbee652d2fae3092 (diff) | |
| download | lwn-d95f1a542c3df396137afa217ef9bd39cb8931ca.tar.gz lwn-d95f1a542c3df396137afa217ef9bd39cb8931ca.zip | |
RISC-V: Implement sparsemem
Implement sparsemem support for Risc-v which helps pave the
way for memory hotplug and eventually P2P support.
Introduce Kconfig options for virtual and physical address bits which
are used to calculate the size of the vmemmap and set the
MAX_PHYSMEM_BITS.
The vmemmap is located directly before the VMALLOC region and sized
such that we can allocate enough pages to populate all the virtual
address space in the system (similar to the way it's done in arm64).
During initialization, call memblocks_present() and sparse_init(),
and provide a stub for vmemmap_populate() (all of which is similar to
arm64).
[greentime.hu@sifive.com: fixed pfn_valid, FIXADDR_TOP and fixed a bug
rebasing onto v5.3]
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Andrew Waterman <andrew@sifive.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Michael Clark <michaeljclark@mac.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Zong Li <zong@andestech.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
[paul.walmsley@sifive.com: updated to apply; minor commit message
reformat]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 86ee362a1375..f392358ad4ea 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -55,6 +55,7 @@ config RISCV select EDAC_SUPPORT select ARCH_HAS_GIGANTIC_PAGE select ARCH_WANT_HUGE_PMD_SHARE if 64BIT + select SPARSEMEM_STATIC if 32BIT config MMU def_bool y @@ -63,12 +64,32 @@ config ZONE_DMA32 bool default y if 64BIT +config VA_BITS + int + default 32 if 32BIT + default 39 if 64BIT + +config PA_BITS + int + default 34 if 32BIT + default 56 if 64BIT + config PAGE_OFFSET hex default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB +config ARCH_FLATMEM_ENABLE + def_bool y + +config ARCH_SPARSEMEM_ENABLE + def_bool y + select SPARSEMEM_VMEMMAP_ENABLE + +config ARCH_SELECT_MEMORY_MODEL + def_bool ARCH_SPARSEMEM_ENABLE + config ARCH_WANT_GENERAL_HUGETLB def_bool y |