提交 · d7071743db31b4f6898b1c742e4b451bb4bc4b02 · openeuler / Kernel

03 10月, 2020 3 次提交

RISC-V: Implement late mapping page table allocation functions · e8dcb61f

由 Atish Patra 提交于 9月 17, 2020

Currently, page table setup is done during setup_va_final where fixmap can
be used to create the temporary mappings. The physical frame is allocated
from memblock_alloc_* functions. However, this won't work if page table
mapping needs to be created for a different mm context (i.e. efi mm) at
a later point of time.

Use generic kernel page allocation function & macros for any mapping
after setup_vm_final.
Signed-off-by: NAtish Patra <atish.patra@wdc.com>
Reviewed-by: NAnup Patel <anup@brainfault.org>
Acked-by: NMike Rapoport <rppt@linux.ibm.com>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

e8dcb61f

RISC-V: Add early ioremap support · 6262f661

由 Atish Patra 提交于 9月 17, 2020

UEFI uses early IO or memory mappings for runtime services before
normal ioremap() is usable. Add the necessary fixmap bindings and
pmd mappings for generic ioremap support to work.
Signed-off-by: NAtish Patra <atish.patra@wdc.com>
Reviewed-by: NAnup Patel <anup@brainfault.org>
Reviewed-by: NPalmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

6262f661

RISC-V: Move DT mapping outof fixmap · 8f3a2b4a

由 Anup Patel 提交于 9月 17, 2020

Currently, RISC-V reserves 1MB of fixmap memory for device tree. However,
it maps only single PMD (2MB) space for fixmap which leaves only < 1MB space
left for other kernel features such as early ioremap which requires fixmap
as well. The fixmap size can be increased by another 2MB but it brings
additional complexity and changes the virtual memory layout as well.
If we require some additional feature requiring fixmap again, it has to be
moved again.

Technically, DT doesn't need a fixmap as the memory occupied by the DT is
only used during boot. That's why, We map device tree in early page table
using two consecutive PGD mappings at lower addresses (< PAGE_OFFSET).
This frees lot of space in fixmap and also makes maximum supported
device tree size supported as PGDIR_SIZE. Thus, init memory section can be used
for the same purpose as well. This simplifies fixmap implementation.
Signed-off-by: NAnup Patel <anup.patel@wdc.com>
Signed-off-by: NAtish Patra <atish.patra@wdc.com>
Reviewed-by: NPalmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

8f3a2b4a

16 9月, 2020 11 次提交

riscv/mm/fault: Set FAULT_FLAG_INSTRUCTION flag in do_page_fault() · a960c132

由 Pekka Enberg 提交于 9月 05, 2020

If the page fault "cause" is EXC_INST_PAGE_FAULT, set the
FAULT_FLAG_INSTRUCTION flag to let handle_mm_fault() and friends know
about it. This has no functional changes because RISC-V uses the default
arch_vma_access_permitted() implementation, which always returns true.
However, dax_pmd_fault(), for example, has a tracepoint that uses
FAULT_FLAG_INSTRUCTION, so we might as well set it.
Signed-off-by: NPekka Enberg <penberg@kernel.org>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

a960c132

riscv/mm/fault: Fix inline placement in vmalloc_fault() declaration · 2baa6d95

由 Pekka Enberg 提交于 9月 05, 2020

The "inline" keyword is in the wrong place in vmalloc_fault()
declaration:

>> arch/riscv/mm/fault.c:56:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
      56 | static void inline vmalloc_fault(struct pt_regs *regs, int code, unsigned long addr)
         | ^~~~~~

Fix that up.
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NPekka Enberg <penberg@kernel.org>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

2baa6d95

riscv/mm/fault: Move access error check to function · afb8c6fe