BMC/Intel-BMC/linux.git/arch/tile/include/asm/dma-mapping.h, branch dev-4.4

dma-mapping: consolidate dma_set_mask

2015-09-10T20:29:01+00:00

Almost everyone implements dma_set_mask the same way, although some time that's hidden in ->set_dma_mask methods. This patch consolidates those into a common implementation that either calls ->set_dma_mask if present or otherwise uses the default implementation. Some architectures used to only call ->set_dma_mask after the initial checks, and those instance have been fixed to do the full work. h8300 implemented dma_set_mask bogusly as a no-ops and has been fixed. Unfortunately some architectures overload unrelated semantics like changing the dma_ops into it so we still need to allow for an architecture override for now. [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig Cc: Arnd Bergmann Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Yoshinori Sato Cc: Michal Simek Cc: Jonas Bonn Cc: Chris Metcalf Cc: Guan Xuetao Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Andy Shevchenko Signed-off-by: Max Filippov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

dma-mapping: consolidate dma_supported

2015-09-10T20:29:01+00:00

Most architectures just call into ->dma_supported, but some also return 1 if the method is not present, or 0 if no dma ops are present (although that should never happeb). Consolidate this more broad version into common code. Also fix h8300 which inorrectly always returned 0, which would have been a problem if it's dma_set_mask implementation wasn't a similarly buggy noop. As a few architectures have much more elaborate implementations, we still allow for arch overrides. [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig Cc: Arnd Bergmann Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Yoshinori Sato Cc: Michal Simek Cc: Jonas Bonn Cc: Chris Metcalf Cc: Guan Xuetao Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Andy Shevchenko Signed-off-by: Max Filippov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

dma-mapping: cosolidate dma_mapping_error

2015-09-10T20:29:01+00:00

Currently there are three valid implementations of dma_mapping_error: (1) call ->mapping_error (2) check for a hardcoded error code (3) always return 0 This patch provides a common implementation that calls ->mapping_error if present, then checks for DMA_ERROR_CODE if defined or otherwise returns 0. [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig Cc: Arnd Bergmann Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Yoshinori Sato Cc: Michal Simek Cc: Jonas Bonn Cc: Chris Metcalf Cc: Guan Xuetao Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Andy Shevchenko Signed-off-by: Max Filippov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

dma-mapping: consolidate dma_{alloc,free}_noncoherent

2015-09-10T20:29:01+00:00

Most architectures do not support non-coherent allocations and either define dma_{alloc,free}_noncoherent to their coherent versions or stub them out. Openrisc uses dma_{alloc,free}_attrs to implement them, and only Mips implements them directly. This patch moves the Openrisc version to common code, and handles the DMA_ATTR_NON_CONSISTENT case in the mips dma_map_ops instance. Note that actual non-coherent allocations require a dma_cache_sync implementation, so if non-coherent allocations didn't work on an architecture before this patch they still won't work after it. [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig Cc: Arnd Bergmann Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Yoshinori Sato Cc: Michal Simek Cc: Jonas Bonn Cc: Chris Metcalf Cc: Guan Xuetao Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Andy Shevchenko Signed-off-by: Max Filippov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

dma-mapping: consolidate dma_{alloc,free}_{attrs,coherent}

2015-09-10T20:29:01+00:00

Since 2009 we have a nice asm-generic header implementing lots of DMA API functions for architectures using struct dma_map_ops, but unfortunately it's still missing a lot of APIs that all architectures still have to duplicate. This series consolidates the remaining functions, although we still need arch opt outs for two of them as a few architectures have very non-standard implementations. This patch (of 5): The coherent DMA allocator works the same over all architectures supporting dma_map operations. This patch consolidates them and converges the minor differences: - the debug_dma helpers are now called from all architectures, including those that were previously missing them - dma_alloc_from_coherent and dma_release_from_coherent are now always called from the generic alloc/free routines instead of the ops dma-mapping-common.h always includes dma-coherent.h to get the defintions for them, or the stubs if the architecture doesn't support this feature - checks for ->alloc / ->free presence are removed. There is only one magic instead of dma_map_ops without them (mic_dma_ops) and that one is x86 only anyway. Besides that only x86 needs special treatment to replace a default devices if none is passed and tweak the gfp_flags. An optional arch hook is provided for that. [linux@roeck-us.net: fix build] [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig Cc: Arnd Bergmann Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Yoshinori Sato Cc: Michal Simek Cc: Jonas Bonn Cc: Chris Metcalf Cc: Guan Xuetao Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Andy Shevchenko Signed-off-by: Guenter Roeck Signed-off-by: Max Filippov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tile PCI RC: make default consistent DMA mask 32-bit

2013-09-03T18:53:37+00:00

This change sets the PCI devices' initial DMA capabilities conservatively and promotes them at the request of the driver, as opposed to assuming advanced DMA capabilities. The old design runs the risk of breaking drivers that assume default capabilities. Signed-off-by: Chris Metcalf

tile PCI RC: add dma_get_required_mask()

2013-08-06T16:56:00+00:00

The standard kernel function dma_get_required_mask() uses the highest DRAM address to determine if 32-bit or 64-bit DMA addressing is needed. This only works on architectures that have direct mapping between the PA and the PCI address space, i.e. those that don't have I/O TLBs or have I/O TLB but choose to use direct mapping. Neither of these are true for tilegx. Whether to use 64-bit DMA should depend on the PCI device's capability only, not on the amount of DRAM installeds, so we now advertise a 64-bit DMA mask unconditionally. Signed-off-by: Chris Metcalf

tile: support LSI MEGARAID SAS HBA hybrid dma_ops

2013-08-06T16:52:33+00:00

The LSI MEGARAID SAS HBA suffers from the problem where it can do 64-bit DMA to streaming buffers but not to consistent buffers. In other words, 64-bit DMA is used for disk data transfers and 32-bit DMA must be used for control message transfers. According to LSI, the firmware is not fully functional yet. This change implements a kind of hybrid dma_ops to support this. Note that on most other platforms, the 64-bit DMA addressing space is the same as the 32-bit DMA space and they overlap the physical memory space. No special arrangement is needed to support this kind of mixed DMA capability. On TILE-Gx, the 64-bit DMA space is completely separate from the 32-bit DMA space. Due to the use of the IOMMU, the 64-bit DMA space doesn't overlap the physical memory space. On the other hand, the 32-bit DMA space overlaps the physical memory space under 4GB. The separate address spaces make it necessary to have separate dma_ops. Signed-off-by: Chris Metcalf

tile: dma_debug: add debug_dma_mapping_error support

2012-11-28T14:29:00+00:00

Add dma-debug interface debug_dma_mapping_error() to debug drivers that fail to check dma mapping errors on addresses returned by dma_map_single() and dma_map_page() interfaces. Signed-off-by: Shuah Khan Signed-off-by: Joerg Roedel

tile pci: enable IOMMU to support DMA for legacy devices

2012-07-18T20:40:17+00:00

This change uses the TRIO IOMMU to map the PCI DMA space and physical memory at different addresses. We also now use the dma_mapping_ops to provide support for non-PCI DMA, PCIe DMA (64-bit) and legacy PCI DMA (32-bit). We use the kernel's software I/O TLB framework (i.e. bounce buffers) for the legacy 32-bit PCI device support since there are a limited number of TLB entries in the IOMMU and it is non-trivial to handle indexing, searching, matching, etc. For 32-bit devices the performance impact of bounce buffers should not be a concern. Signed-off-by: Chris Metcalf