linux.git/arch/xtensa/kernel, branch v4.19

Merge tag 'xtensa-20180820' of git://github.com/jcmvbkbc/linux-xtensa

2018-08-22T21:04:41+00:00

Pull Xtensa updates from Max Filippov:

 - switch xtensa arch to the generic noncoherent direct mapping
   operations

 - add support for DMA_ATTR_NO_KERNEL_MAPPING attribute

 - clean up users of platform/hardware.h in generic Xtensa code

 - fix assembly cache maintenance code for long cache lines

 - rework noMMU cache attributes initialization

 - add big-endian HiFi2 test_kc705_be CPU variant

* tag 'xtensa-20180820' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: add test_kc705_be variant
  xtensa: clean up boot-elf/bootstrap.S
  xtensa: make bootparam parsing optional
  xtensa: drop variant IRQ support
  xtensa: drop unneeded platform/hardware.h headers
  xtensa: move PLATFORM_NR_IRQS to Kconfig
  xtensa: rework {CONFIG,PLATFORM}_DEFAULT_MEM_START
  xtensa: drop unused {CONFIG,PLATFORM}_DEFAULT_MEM_SIZE
  xtensa: rework noMMU cache attributes initialization
  xtensa: increase ranges in ___invalidate_{i,d}cache_all
  xtensa: limit offsets in __loop_cache_{all,page}
  xtensa: platform-specific handling of coherent memory
  xtensa: support DMA_ATTR_NO_KERNEL_MAPPING attribute
  xtensa: use generic dma_noncoherent_ops

Merge branch 'xtensa-dma-fixes' (early part) into xtensa-fixes

2018-08-20T20:24:24+00:00

This switches xtensa arch to the generic noncoherent direct mapping
operations, adds support for DMA_ATTR_NO_KERNEL_MAPPING attribute and
allows for platform-specific handling of coherent memory.

Signed-off-by: Max Filippov

xtensa: make bootparam parsing optional

2018-08-20T19:28:05+00:00

A kernel may not need any boot parameters from the bootloader, allow
disabling bootparam parsing in that case.

Signed-off-by: Max Filippov

xtensa: drop variant IRQ support

2018-08-20T19:28:05+00:00

If an xtensa core provides an additional IRQ controller it should be
treated as a separate piece of hardware and be driven by an irqchip
driver.

Signed-off-by: Max Filippov

xtensa: drop unneeded platform/hardware.h headers

2018-08-20T19:28:04+00:00

platform/hardware.h no longer supply any information for processor.h,
vectors.h, setup.c or vmlinux.lds.S, don't include it.
This header is now empty in the platforms/iss, so remove it altogether.

Signed-off-by: Max Filippov

kernel/dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous()

2018-08-17T23:20:32+00:00

The CMA memory allocator doesn't support standard gfp flags for memory
allocation, so there is no point having it as a parameter for
dma_alloc_from_contiguous() function.  Replace it by a boolean no_warn
argument, which covers all the underlaying cma_alloc() function
supports.

This will help to avoid giving false feeling that this function supports
standard gfp flags and callers can pass __GFP_ZERO to get zeroed buffer,
what has already been an issue: see commit dd65a941f6ba ("arm64:
dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag").

Link: http://lkml.kernel.org/r/20180709122020eucas1p21a71b092975cb4a3b9954ffc63f699d1~-sqUFoa-h2939329393eucas1p2Y@eucas1p2.samsung.com
Signed-off-by: Marek Szyprowski 
Acked-by: Michał Nazarewicz 
Acked-by: Vlastimil Babka 
Reviewed-by: Christoph Hellwig 
Cc: Laura Abbott 
Cc: Michal Hocko 
Cc: Joonsoo Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

xtensa: rework noMMU cache attributes initialization

2018-08-14T03:08:19+00:00

Marking default memory region as cached is not always sufficient and is
not flexible. Allow specifying cache attributes for the whole memory
address space with new config entry MEMMAP_CACHEATTR. Apply it after
cache initialization.

Signed-off-by: Max Filippov

xtensa: platform-specific handling of coherent memory

2018-07-11T22:59:41+00:00

Memory layout is not fixed for noMMU xtensa configurations. Platforms
that need to use coherent DMA should implement platform_vaddr_* helpers
that check address type (cached/uncached) and convert addresses between
these types.

Signed-off-by: Max Filippov

xtensa: support DMA_ATTR_NO_KERNEL_MAPPING attribute

2018-07-11T18:13:33+00:00

An application that doesn't need kernel mapping of the DMA memory it
allocates may specify DMA_ATTR_NO_KERNEL_MAPPING attribute to allocation
function. Support this attribute and return address of the first struct
page that covers the allocation.

Signed-off-by: Max Filippov

xtensa: use generic dma_noncoherent_ops

2018-07-11T18:10:21+00:00

Switch to the generic noncoherent direct mapping implementation.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Max Filippov