linux-toradex.git/kernel/dma/mapping.c, branch v5.10-rc1

dma-mapping: move large parts of to kernel/dma

2020-10-06T05:07:06+00:00

Most of the dma_direct symbols should only be used by direct.c and
mapping.c, so move them to kernel/dma.  In fact more of dma-direct.h
should eventually move, but that will require more coordination with
other subsystems.

Signed-off-by: Christoph Hellwig

dma-mapping: move dma-debug.h to kernel/dma/

2020-10-06T05:07:05+00:00

Most of dma-debug.h is not required by anything outside of kernel/dma.
Move the four declarations needed by dma-mappin.h or dma-ops providers
into dma-mapping.h and dma-map-ops.h, and move the remainder of the
file to kernel/dma/debug.h.

Signed-off-by: Christoph Hellwig

dma-mapping: split

2020-10-06T05:07:03+00:00

Split out all the bits that are purely for dma_map_ops implementations
and related code into a new  header so that they
don't get pulled into all the drivers.  That also means the architecture
specific  is not pulled in by 
any more, which leads to a missing includes that were pulled in by the
x86 or arm versions in a few not overly portable drivers.

Signed-off-by: Christoph Hellwig

dma-mapping: add new {alloc,free}_noncoherent dma_map_ops methods

2020-09-25T04:20:47+00:00

This will allow IOMMU drivers to allocate non-contigous memory and
return a vmapped virtual address.

Signed-off-by: Christoph Hellwig

dma-mapping: add a new dma_alloc_pages API

2020-09-25T04:20:47+00:00

This API is the equivalent of alloc_pages, except that the returned memory
is guaranteed to be DMA addressable by the passed in device.  The
implementation will also be used to provide a more sensible replacement
for DMA_ATTR_NON_CONSISTENT flag.

Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages
as its backend.

Signed-off-by: Christoph Hellwig 
Acked-by: Thomas Bogendoerfer  (MIPS part)

dma-mapping: remove dma_cache_sync

2020-09-25T04:20:46+00:00

All users are gone now, remove the API.

Signed-off-by: Christoph Hellwig 
Acked-by: Thomas Bogendoerfer  (MIPS part)

dma-direct: Fix potential NULL pointer dereference

2020-09-17T16:43:20+00:00

When booting the kernel v5.9-rc4 on a VM, the kernel would panic when
printing a warning message in swiotlb_map(). The dev->dma_mask must not
be a NULL pointer when calling the dma mapping layer. A NULL pointer
check can potentially avoid the panic.

Signed-off-by: Thomas Tai 
Reviewed-by: Konrad Rzeszutek Wilk 
Signed-off-by: Christoph Hellwig

dma-mapping: move dma_common_{mmap,get_sgtable} out of mapping.c

2020-09-11T07:14:56+00:00

Add a new file that contains helpers for misc DMA ops, which is only
built when CONFIG_DMA_OPS is set.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Robin Murphy

dma-mapping: add a dma_ops_bypass flag to struct device

2020-07-19T07:29:29+00:00

Several IOMMU drivers have a bypass mode where they can use a direct
mapping if the devices DMA mask is large enough.  Add generic support
to the core dma-mapping code to do that to switch those drivers to
a common solution.

Signed-off-by: Christoph Hellwig 
Tested-by: Alexey Kardashevskiy 
Reviewed-by: Alexey Kardashevskiy

dma-mapping: move the remaining DMA API calls out of line

2020-07-16T14:58:33+00:00

For a long time the DMA API has been implemented inline in dma-mapping.h,
but the function bodies can be quite large.  Move them all out of line.

This also removes all the dma_direct_* exports as those are just
implementation details and should never be used by drivers directly.

Signed-off-by: Christoph Hellwig 
Tested-by: Alexey Kardashevskiy 
Reviewed-by: Alexey Kardashevskiy