BMC/Intel-BMC/linux.git/include/linux/dma-noncoherent.h, branch dev-5.8-intel

mm: introduce include/linux/pgtable.h

2020-06-09T16:39:13+00:00

The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds

dma-direct: provide a arch_dma_clear_uncached hook

2020-03-16T09:48:12+00:00

This allows the arch code to reset the page tables to cached access when freeing a dma coherent allocation that was set to uncached using arch_dma_set_uncached. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

dma-direct: make uncached_kernel_address more general

2020-03-16T09:48:09+00:00

Rename the symbol to arch_dma_set_uncached, and pass a size to it as well as allow an error return. That will allow reusing this hook for in-place pagetable remapping. As the in-place remap doesn't always require an explicit cache flush, also detangle ARCH_HAS_DMA_PREP_COHERENT from ARCH_HAS_DMA_SET_UNCACHED. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

dma-direct: remove the cached_kernel_address hook

2020-03-16T09:48:02+00:00

dma-direct now finds the kernel address for coherent allocations based on the dma address, so the cached_kernel_address hooks is unused and can be removed entirely. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

dma-mapping: drop the dev argument to arch_sync_dma_for_*

2019-11-20T19:31:38+00:00

These are pure cache maintainance routines, so drop the unused struct device argument. Signed-off-by: Christoph Hellwig Suggested-by: Daniel Vetter

dma-direct: provide mmap and get_sgtable method overrides

2019-11-11T09:52:15+00:00

For dma-direct we know that the DMA address is an encoding of the physical address that we can trivially decode. Use that fact to provide implementations that do not need the arch_dma_coherent_to_pfn architecture hook. Note that we still can only support mmap of non-coherent memory only if the architecture provides a way to set an uncached bit in the page tables. This must be true for architectures that use the generic remap helpers, but other architectures can also manually select it. Signed-off-by: Christoph Hellwig Reviewed-by: Max Filippov

dma-mapping: remove arch_dma_mmap_pgprot

2019-08-29T14:43:22+00:00

arch_dma_mmap_pgprot is used for two things: 1) to override the "normal" uncached page attributes for mapping memory coherent to devices that can't snoop the CPU caches 2) to provide the special DMA_ATTR_WRITE_COMBINE semantics on older arm systems and some mips platforms Replace one with the pgprot_dmacoherent macro that is already provided by arm and much simpler to use, and lift the DMA_ATTR_WRITE_COMBINE handling to common code with an explicit arch opt-in. Signed-off-by: Christoph Hellwig Acked-by: Geert Uytterhoeven # m68k Acked-by: Paul Burton # mips

dma-mapping: fix page attributes for dma_mmap_*

2019-08-10T17:52:45+00:00

All the way back to introducing dma_common_mmap we've defaulted to mark the pages as uncached. But this is wrong for DMA coherent devices. Later on DMA_ATTR_WRITE_COMBINE also got incorrect treatment as that flag is only treated special on the alloc side for non-coherent devices. Introduce a new dma_pgprot helper that deals with the check for coherent devices so that only the remapping cases ever reach arch_dma_mmap_pgprot and we thus ensure no aliasing of page attributes happens, which makes the powerpc version of arch_dma_mmap_pgprot obsolete and simplifies the remaining ones. Note that this means arch_dma_mmap_pgprot is a bit misnamed now, but we'll phase it out soon. Fixes: 64ccc9c033c6 ("common: dma-mapping: add support for generic dma_mmap_* calls") Reported-by: Shawn Anastasio Reported-by: Gavin Li Signed-off-by: Christoph Hellwig Acked-by: Catalin Marinas # arm64

dma-mapping: mark dma_alloc_need_uncached as __always_inline

2019-07-08T21:19:33+00:00

Without the __always_inline at least i386 configs that have CONFIG_OPTIMIZE_INLINING set seem fail to inline dma_alloc_need_uncached, leading to a linker error because of undefined symbols. Reported-by: Randy Dunlap Signed-off-by: Christoph Hellwig Acked-by: Randy Dunlap # build-tested

dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code

2019-06-25T12:28:05+00:00

DMA_ATTR_NO_KERNEL_MAPPING is generally implemented by allocating normal cacheable pages or CMA memory, and then returning the page pointer as the opaque handle. Lift that code from the xtensa and generic dma remapping implementations into the generic dma-direct code so that we don't even call arch_dma_alloc for these allocations. Signed-off-by: Christoph Hellwig