Skip to content

R
raspberrypi-kernel

openeuler / raspberrypi-kernel

通知 13
Star 1
Fork 0
R
raspberrypi-kernel
切换分支/标签
  1. 13 9月, 2007 1 次提交
  3. 24 7月, 2007 1 次提交
  5. 23 7月, 2007 1 次提交
  7. 20 7月, 2007 1 次提交
  9. 18 7月, 2007 1 次提交
  11. 17 7月, 2007 1 次提交
  13. 12 7月, 2007 1 次提交
  15. 29 6月, 2007 2 次提交
  17. 25 6月, 2007 1 次提交
  19. 14 6月, 2007 2 次提交
  21. 23 5月, 2007 1 次提交
  23. 12 5月, 2007 2 次提交
  25. 09 5月, 2007 3 次提交
    • H
      [POWERPC] Don't use SLAB/SLUB for PTE pages · 517e2263
      由 Hugh Dickins 提交于 
      The SLUB allocator relies on struct page fields first_page and slab,
overwritten by ptl when SPLIT_PTLOCK: so the SLUB allocator cannot then
be used for the lowest level of pagetable pages.  This was obstructing
SLUB on PowerPC, which uses kmem_caches for its pagetables.  So convert
its pte level to use normal gfp pages (whereas pmd, pud and 64k-page pgd
want partpages, so continue to use kmem_caches for pmd, pud and pgd).
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      517e2263
    • B
      [POWERPC] Add ability to 4K kernel to hash in 64K pages · 16c2d476
      由 Benjamin Herrenschmidt 提交于 
      This adds the ability for a kernel compiled with 4K page size
to have special slices containing 64K pages and hash the right type
of hash PTEs.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      16c2d476
    • B
      [POWERPC] Introduce address space "slices" · d0f13e3c
      由 Benjamin Herrenschmidt 提交于 
      The basic issue is to be able to do what hugetlbfs does but with
different page sizes for some other special filesystems; more
specifically, my need is:

 - Huge pages

 - SPE local store mappings using 64K pages on a 4K base page size
kernel on Cell

 - Some special 4K segments in 64K-page kernels for mapping a dodgy
type of powerpc-specific infiniband hardware that requires 4K MMU
mappings for various reasons I won't explain here.

The main issues are:

 - To maintain/keep track of the page size per "segment" (as we can
only have one page size per segment on powerpc, which are 256MB
divisions of the address space).

 - To make sure special mappings stay within their allotted
"segments" (including MAP_FIXED crap)

 - To make sure everybody else doesn't mmap/brk/grow_stack into a
"segment" that is used for a special mapping

Some of the necessary mechanisms to handle that were present in the
hugetlbfs code, but mostly in ways not suitable for anything else.

The patch relies on some changes to the generic get_unmapped_area()
that just got merged.  It still hijacks hugetlb callbacks here or
there as the generic code hasn't been entirely cleaned up yet but
that shouldn't be a problem.

So what is a slice ?  Well, I re-used the mechanism used formerly by our
hugetlbfs implementation which divides the address space in
"meta-segments" which I called "slices".  The division is done using
256MB slices below 4G, and 1T slices above.  Thus the address space is
divided currently into 16 "low" slices and 16 "high" slices.  (Special
case: high slice 0 is the area between 4G and 1T).

Doing so simplifies significantly the tracking of segments and avoids
having to keep track of all the 256MB segments in the address space.

While I used the "concepts" of hugetlbfs, I mostly re-implemented
everything in a more generic way and "ported" hugetlbfs to it.

Slices can have an associated page size, which is encoded in the mmu
context and used by the SLB miss handler to set the segment sizes.  The
hash code currently doesn't care, it has a specific check for hugepages,
though I might add a mechanism to provide per-slice hash mapping
functions in the future.

The slice code provide a pair of "generic" get_unmapped_area() (bottomup
and topdown) functions that should work with any slice size.  There is
some trickiness here so I would appreciate people to have a look at the
implementation of these and let me know if I got something wrong.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      d0f13e3c
  27. 08 5月, 2007 4 次提交
  29. 07 5月, 2007 1 次提交
  31. 02 5月, 2007 1 次提交
  33. 27 4月, 2007 1 次提交
  35. 24 4月, 2007 1 次提交
  37. 13 4月, 2007 6 次提交
  39. 27 3月, 2007 1 次提交
  41. 26 3月, 2007 1 次提交
  43. 22 3月, 2007 5 次提交
  45. 09 3月, 2007 1 次提交