linux-toradex.git/arch/xtensa/mm, branch v3.17

xtensa: support highmem in aliasing cache flushing code

2014-08-14T07:59:23+00:00

Use __flush_invalidate_dcache_page_alias with alias set to color of the
page physical address instead of __flush_invalidate_dcache_page: this
works for high memory pages and mapping/unmapping to the TLBTEMP area is
virtually free.

Allow building configurations with aliasing cache and highmem enabled.

Signed-off-by: Max Filippov

xtensa: support aliasing cache in kmap

2014-08-14T07:59:22+00:00

Define ARCH_PKMAP_COLORING and provide corresponding macro definitions
on cores with aliasing data cache.

Instead of single last_pkmap_nr maintain an array last_pkmap_nr_arr of
pkmap counters for each page color. Make sure that kmap maps physical
page at virtual address with color matching its physical address.

Signed-off-by: Max Filippov

xtensa: support aliasing cache in k[un]map_atomic

2014-08-14T07:59:21+00:00

Map high memory pages at virtual addresses with color that match color
of their physical address. Existing cache alias management mechanisms
may be used with such pages.

Signed-off-by: Max Filippov

xtensa: implement clear_user_highpage and copy_user_highpage

2014-08-14T07:59:20+00:00

Existing clear_user_page and copy_user_page cannot be used with highmem
because they calculate physical page address from its virtual address
and do it incorrectly in case of high memory page mapped with
kmap_atomic. Also kmap is not needed, as most likely userspace mapping
color would be different from the kmapped color.

Provide clear_user_highpage and copy_user_highpage functions that
determine if temporary mapping is needed for the pages. Move most of the
logic of the former clear_user_page and copy_user_page to
xtensa/mm/cache.c only leaving temporary mapping setup, invalidation and
clearing/copying in the xtensa/mm/misc.S. Rename these functions to
clear_page_alias and copy_page_alias.

Signed-off-by: Max Filippov

xtensa: allow fixmap and kmap span more than one page table

2014-08-14T07:59:18+00:00

To support aliasing cache both kmap region sizes are multiplied by the
number of data cache colors. After that expansion page tables that cover
kmap regions may become larger than one page. Correctly allocate and
initialize page tables in this case.

Signed-off-by: Max Filippov

xtensa: make fixmap region addressing grow with index

2014-08-14T07:59:17+00:00

It's much easier to reason about alignment and coloring of regions
located in the fixmap when fixmap index is just a PFN within the fixmap
region. Change fixmap addressing so that index 0 corresponds to
FIXADDR_START instead of the FIXADDR_TOP.

Signed-off-by: Max Filippov

xtensa: fix sysmem reservation at the end of existing block

2014-06-09T18:29:12+00:00

When sysmem reservation occurs exactly at the end of an existing block
that block is deleted, because it is incorrectly included in the range
of memblocks to remove. Fix that by skipping such block.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov

xtensa: add HIGHMEM support

2014-04-06T17:29:21+00:00

Introduce fixmap area just below the vmalloc region. Use it for atomic
mapping of high memory pages.
High memory on cores with cache aliasing is not supported and is still
to be implemented. Fail build for such configurations for now.

Signed-off-by: Max Filippov

xtensa: optimize local_flush_tlb_kernel_range

2014-04-06T17:29:17+00:00

Don't flush whole TLB if only a small kernel range is requested.

Signed-off-by: Max Filippov

xtensa: dump sysmem from the bootmem_init

2014-04-01T21:35:55+00:00

Debug dump of physical memory configuration. Useful for inspection of
resulting memory map, esp. in the presence of memmap= kernel option.

Signed-off-by: Max Filippov