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| author | Frank Li <Frank.Li@nxp.com> | 2026-10-05 05:37:17 -0400 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2026-10-09 11:41:33 +0200 |
| commit | bbc109e0e686266d784483df108af206bc52e120 (patch) | |
| tree | 9cc4528524ce9ad9b0923c8cca288eddc64d8053 | |
| parent | 072975a8a578a62ea68ec1ceb8d2d7dcfb5dfefa (diff) | |
| download | linux-next-bbc109e0e686266d784483df108af206bc52e120.tar.gz linux-next-bbc109e0e686266d784483df108af206bc52e120.zip | |
dmaengine: add dmaengine_get_cap_mask() and dmaengine_has_cap() helpers
Add two new inline helpers to query DMA channel capabilities without
directly accessing the internal dma_device pointer:
dmaengine_get_cap_mask(chan) - returns a const pointer to the
capability mask of the DMA device backing the channel.
dmaengine_has_cap(chan, tx_type) - returns true if the channel
supports the given transaction type.
These complement the existing dma_has_cap() macro which operates on
a dma_cap_mask_t directly.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20261005-dmaengine_prep_dma_pq-v3-4-a4a241f26fa7@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
| -rw-r--r-- | include/linux/dmaengine.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index efe421503501..4e4e1cc22b9a 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -1606,6 +1606,18 @@ dmaengine_get_fill_align(struct dma_chan *chan) } /** + * dmaengine_get_cap_mask - get capability mask of a DMA channel + * @chan: DMA channel + * + * Return a pointer to the capability mask of the DMA device backing @chan. + */ +static inline const dma_cap_mask_t * +dmaengine_get_cap_mask(struct dma_chan *chan) +{ + return &chan->device->cap_mask; +} + +/** * dmaengine_is_copy_aligned - test copy alignment * @chan: DMA channel * @off1: first buffer offset @@ -1830,6 +1842,19 @@ __dma_has_cap(enum dma_transaction_type tx_type, dma_cap_mask_t *srcp) return test_bit(tx_type, srcp->bits); } +/** + * dmaengine_has_cap - test whether a DMA channel supports a transaction type + * @chan: DMA channel + * @tx_type: transaction type to test + * + * Return true if @chan supports @tx_type, false otherwise. + */ +static inline bool +dmaengine_has_cap(struct dma_chan *chan, enum dma_transaction_type tx_type) +{ + return dma_has_cap(tx_type, chan->device->cap_mask); +} + #define for_each_dma_cap_mask(cap, mask) \ for_each_set_bit(cap, mask.bits, DMA_TX_TYPE_END) |