linux-stable.git/include/linux/dma-mapping.h, branch v4.18.2

x86/pci-dma: switch the VIA 32-bit DMA quirk to use the struct device flag

2018-05-28T10:48:25+00:00

Instead of globally disabling > 32bit DMA using the arch_dma_supported
hook walk the PCI bus under the actually affected bridge and mark every
device with the dma_32bit_limit flag.  This also gets rid of the
arch_dma_supported hook entirely.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Thomas Gleixner

dma-mapping: remove unused gfp_t parameter to arch_dma_alloc_attrs

2018-05-25T09:23:06+00:00

Signed-off-by: Huaisheng Ye 
Signed-off-by: Christoph Hellwig

dma-mapping: provide a generic dma-noncoherent implementation

2018-05-19T06:46:12+00:00

Add a new dma_map_ops implementation that uses dma-direct for the
address mapping of streaming mappings, and which requires arch-specific
implemenations of coherent allocate/free.

Architectures have to provide flushing helpers to ownership trasnfers
to the device and/or CPU, and can provide optional implementations of
the coherent mmap functionality, and the cache_flush routines for
non-coherent long term allocations.

Signed-off-by: Christoph Hellwig 
Tested-by: Alexey Brodkin 
Acked-by: Vineet Gupta

dma-mapping: move the NEED_DMA_MAP_STATE config symbol to lib/Kconfig

2018-05-09T04:56:08+00:00

This way we have one central definition of it, and user can select it as
needed.  Note that we now also always select it when CONFIG_DMA_API_DEBUG
is select, which fixes some incorrect checks in a few network drivers.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Anshuman Khandual

PCI: remove PCI_DMA_BUS_IS_PHYS

2018-05-07T05:15:41+00:00

This was used by the ide, scsi and networking code in the past to
determine if they should bounce payloads.  Now that the dma mapping
always have to support dma to all physical memory (thanks to swiotlb
for non-iommu systems) there is no need to this crude hack any more.

Signed-off-by: Christoph Hellwig 
Acked-by: Palmer Dabbelt  (for riscv)
Reviewed-by: Jens Axboe

Merge tag 'dma-mapping-4.17' of git://git.infradead.org/users/hch/dma-mapping

2018-04-05T17:23:24+00:00

Pull dma-mapping updates from Christoph Hellwig:
 "Very light this round as the interesting dma mapping changes went
  through the x86 tree.

  This just provides proper stubs for architectures not supporting dma
  (Geert Uytterhoeven)"

* tag 'dma-mapping-4.17' of git://git.infradead.org/users/hch/dma-mapping:
  usb: gadget: Add NO_DMA dummies for DMA mapping API
  scsi: Add NO_DMA dummies for SCSI DMA mapping API
  mm: Add NO_DMA dummies for DMA pool API
  dma-coherent: Add NO_DMA dummies for managed DMA API
  dma-mapping: Convert NO_DMA get_dma_ops() into a real dummy

dma-mapping: Don't clear GFP_ZERO in dma_alloc_attrs

2018-03-28T15:34:23+00:00

Revert the clearing of __GFP_ZERO in dma_alloc_attrs and move it to
dma_direct_alloc for now.  While most common architectures always zero dma
cohereny allocations (and x86 did so since day one) this is not documented
and at least arc and s390 do not zero without the explicit __GFP_ZERO
argument.

Fixes: 57bf5a8963f8 ("dma-mapping: clear harmful GFP_* flags in common code")
Reported-by: Evgeniy Didin 
Reported-by: Sebastian Ott 
Signed-off-by: Christoph Hellwig 
Signed-off-by: Thomas Gleixner 
Tested-by: Evgeniy Didin 
Cc: iommu@lists.linux-foundation.org
Link: https://lkml.kernel.org/r/20180328133535.17302-2-hch@lst.de

dma-coherent: Add NO_DMA dummies for managed DMA API

2018-03-16T18:58:27+00:00

Add dummies for dmam_{alloc,free}_coherent(), to allow compile-testing
if NO_DMA=y.

This prevents the following from showing up later:

    ERROR: "dmam_alloc_coherent" [drivers/net/ethernet/arc/arc_emac.ko] undefined!
    ERROR: "dmam_free_coherent" [drivers/net/ethernet/apm/xgene/xgene-enet.ko] undefined!
    ERROR: "dmam_alloc_coherent" [drivers/net/ethernet/apm/xgene/xgene-enet.ko] undefined!
    ERROR: "dmam_alloc_coherent" [drivers/mtd/nand/hisi504_nand.ko] undefined!
    ERROR: "dmam_alloc_coherent" [drivers/mmc/host/dw_mmc.ko] undefined!

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Mark Brown 
Acked-by: Robin Murphy 
Signed-off-by: Christoph Hellwig

dma-mapping: Convert NO_DMA get_dma_ops() into a real dummy

2018-03-16T18:58:27+00:00

If NO_DMA=y, get_dma_ops() returns a reference to the
non-existing symbol bad_dma_ops, thus causing a link failure if it is
ever used.

Make get_dma_ops() return NULL instead, to avoid the link failure.
This allows to improve compile-testing, and limits the need to keep on
sprinkling dependencies on HAS_DMA all over the place.

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Mark Brown 
Acked-by: Robin Murphy 
Signed-off-by: Christoph Hellwig

dma-mapping: fix a comment typo

2018-02-12T15:59:08+00:00

Reported-by: Randy Dunlap 
Signed-off-by: Christoph Hellwig