linux-toradex.git/arch/powerpc/include/asm/page_64.h, branch v4.14

powerpc/mm/slice: Move slice_mask struct definition to slice.c

2017-03-31T12:09:56+00:00

This structure definition need not be in a header since this is used only by
slice.c file. So move it to slice.c. This also allow us to use SLICE_NUM_HIGH
instead of 64.

I also switch the low_slices type to u64 from u16. This doesn't have an impact
on size of struct due to padding added with u16 type. This helps in using
bitmap printing function for printing slice mask.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman

powerpc/mm/slice: Convert slice_mask high slice to a bitmap

2017-03-31T12:09:53+00:00

In followup patch we want to increase the va range which will result
in us requiring high_slices to have more than 64 bits. To enable this
convert high_slices to bitmap. We keep the number bits same in this patch
and later change that to higher value

Signed-off-by: Aneesh Kumar K.V 
[mpe: Fold in fix to use bitmap_empty()]
Signed-off-by: Michael Ellerman

powerpc/64: Clean up ppc64_caches using a struct per cache

2017-02-06T08:46:04+00:00

We have two set of identical struct members for the I and D sides
and mostly identical bunches of code to parse the device-tree to
populate them. Instead make a ppc_cache_info structure with one
copy for I and one for D

Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Michael Ellerman

powerpc/64: Fix naming of cache block vs. cache line

2017-02-06T08:46:04+00:00

In a number of places we called "cache line size" what is actually
the cache block size, which in the powerpc architecture, means the
effective size to use with cache management instructions (it can
be different from the actual cache line size).

We fix the naming across the board and properly retrieve both
pieces of information when available in the device-tree.

Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Michael Ellerman

powerpc/mm/slice: Remove slice_mm_new_context()

2016-05-11T11:54:00+00:00

The usage in mm mmu_context_nohash.c is bogus, because we set the
context.id value to MMU_NO_CONTEXT 4 lines previously in the same
function, meaning slice_mm_new_context() will always be true.

The book3s 64 usage was removed in the previous commit. So remove it as
unused.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman

powerpc/mm: Make page table size a variable

2016-05-01T08:32:48+00:00

Radix and hash MMU models support different page table sizes. Make
the #defines a variable so that existing code can work with variable
sizes.

Slice related code is only used by hash, so use hash constants there. We
will replicate some of the boundary conditions with resepct to TASK_SIZE
using radix values too. Right now we do boundary condition check using
hash constants.

Swapper pgdir size is initialized in asm code. We select the max pgd
size to keep it simple. For now we select hash pgdir. When adding radix
we will switch that to radix pgdir which is 64K.

BUILD_BUG_ON check which is removed is already done in hugepage_init()
using MAYBE_BUILD_BUG_ON().

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman

powerpc: Speed up clear_page by unrolling it

2014-10-02T06:04:21+00:00

Unroll clear_page 8 times. A simple microbenchmark which
allocates and frees a zeroed page:

for (i = 0; i < iterations; i++) {
	unsigned long p = __get_free_page(GFP_KERNEL | __GFP_ZERO);
	free_page(p);
}

improves 20% on POWER8.

This assumes cacheline sizes won't grow beyond 512 bytes or
page sizes wont drop below 1kB, which is unlikely, but we could
add a runtime check during early init if it makes people nervous.

Michael found that some versions of gcc produce quite bad code
(all multiplies), so we give gcc a hand by using shifts and adds.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

powerpc: Remove stale function prototypes

2014-09-25T13:14:43+00:00

There were a number of prototypes for functions that no longer
exist. Remove them.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

mm: remove free_area_cache use in powerpc architecture

2013-04-30T01:05:10+00:00

As all other architectures have been converted to use vm_unmapped_area(),
we are about to retire the free_area_cache.

This change simply removes the use of that cache in
slice_get_unmapped_area(), which will most certainly have a
performance cost. Next one will convert that function to use the
vm_unmapped_area() infrastructure and regain the performance.

Signed-off-by: Michel Lespinasse 
Acked-by: Rik van Riel 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: "Aneesh Kumar K.V" 
Signed-off-by: Andrew Morton 
Signed-off-by: Benjamin Herrenschmidt

powerpc/mm: Make some of the PGTABLE_RANGE dependency explicit

2012-09-17T06:31:53+00:00

slice array size and slice mask size depend on PGTABLE_RANGE.

Reviewed-by: Paul Mackerras 
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Benjamin Herrenschmidt