linux.git/kernel/dma/mapping.c, branch v5.2-rc2

dma-mapping: remove an unnecessary NULL check

2019-04-24T14:28:13+00:00

We already dereferenced "dev" when we called get_dma_ops() so this NULL
check is too late.  We're not supposed to pass NULL "dev" pointers to
dma_alloc_attrs().

Signed-off-by: Dan Carpenter 
Signed-off-by: Christoph Hellwig

x86/dma: Remove the x86_dma_fallback_dev hack

2019-04-08T15:52:46+00:00

Now that we removed support for the NULL device argument in the DMA API,
there is no need to cater for that in the x86 code.

Signed-off-by: Christoph Hellwig

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2019-03-10T19:47:57+00:00

Pull virtio updates from Michael Tsirkin:
 "Several fixes, most notably fix for virtio on swiotlb systems"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost: silence an unused-variable warning
  virtio: hint if callbacks surprisingly might sleep
  virtio-ccw: wire up ->bus_name callback
  s390/virtio: handle find on invalid queue gracefully
  virtio-ccw: diag 500 may return a negative cookie
  virtio_balloon: remove the unnecessary 0-initialization
  virtio-balloon: improve update_balloon_size_func
  virtio-blk: Consider virtio_max_dma_size() for maximum segment size
  virtio: Introduce virtio_max_dma_size()
  dma: Introduce dma_max_mapping_size()
  swiotlb: Add is_swiotlb_active() function
  swiotlb: Introduce swiotlb_max_mapping_size()

dma: Introduce dma_max_mapping_size()

2019-03-06T16:19:11+00:00

The function returns the maximum size that can be mapped
using DMA-API functions. The patch also adds the
implementation for direct DMA and a new dma_map_ops pointer
so that other implementations can expose their limit.

Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Joerg Roedel 
Signed-off-by: Michael S. Tsirkin

dma-mapping, powerpc: simplify the arch dma_set_mask override

2019-02-18T11:41:03+00:00

Instead of letting the architecture supply all of dma_set_mask just
give it an additional hook selected by Kconfig.

Signed-off-by: Christoph Hellwig 
Tested-by: Christian Zigotzky 
Signed-off-by: Michael Ellerman

powerpc/dma: stop overriding dma_get_required_mask

2019-02-18T11:41:03+00:00

The ppc_md and pci_controller_ops methods are unused now and can be
removed.  The dma_nommu implementation is generic to the generic one
except for using max_pfn instead of calling into the memblock API,
and all other dma_map_ops instances implement a method of their own.

Signed-off-by: Christoph Hellwig 
Tested-by: Christian Zigotzky 
Signed-off-by: Michael Ellerman

dma-mapping: remove dmam_{declare,release}_coherent_memory

2019-01-04T08:03:17+00:00

These functions have never been used.

Signed-off-by: Christoph Hellwig

dma-mapping: implement dmam_alloc_coherent using dmam_alloc_attrs

2019-01-04T08:03:16+00:00

dmam_alloc_coherent is just the default no-flags case of
dmam_alloc_attrs, so take advantage of this similar to the non-managed
version.

Signed-off-by: Christoph Hellwig

dma-mapping: fix inverted logic in dma_supported

2018-12-20T16:47:55+00:00

The cleanup in commit 356da6d0cde3 ("dma-mapping: bypass indirect calls
for dma-direct") accidentally inverted the logic in the check for the
presence of a ->dma_supported() callback. Switch this back to the way it
was to prevent a crash on boot.

Fixes: 356da6d0cde3 ("dma-mapping: bypass indirect calls for dma-direct")
Signed-off-by: Thierry Reding 
Signed-off-by: Christoph Hellwig

dma-mapping: bypass indirect calls for dma-direct

2018-12-13T20:06:18+00:00

Avoid expensive indirect calls in the fast path DMA mapping
operations by directly calling the dma_direct_* ops if we are using
the directly mapped DMA operations.

Signed-off-by: Christoph Hellwig 
Acked-by: Jesper Dangaard Brouer 
Tested-by: Jesper Dangaard Brouer 
Tested-by: Tony Luck