diff options
| author | Koichiro Den <den@valinux.co.jp> | 2026-07-21 15:28:15 +0900 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2026-07-21 16:00:36 +0530 |
| commit | 0613e7934ee233d726af8d8c89f251a1c4df738d (patch) | |
| tree | 898c9cfd79eaafa4506bcf2ff366d1848199f281 /include/linux/dma | |
| parent | 1d68178b3404737af2cee6c7b4395de3de6dccaa (diff) | |
dmaengine: dw-edma: Program endpoint function numbers
The eDMA/HDMA transfers the driver issues carry a requester function
number in their TLPs, but nothing ever programs it: eDMA v0 leaves the
FUNC_NUM field of the channel control word zero and HDMA leaves the
per-channel func_num register at its reset value, so every transfer is
attributed to function 0. That is invisible in single-function setups,
but once the DMA block serves a non-zero endpoint function, its
requests must carry that function's number for the host to attribute
and translate them correctly.
Record the function number in the chip data (PCI_FUNC() of the probing
device for dw-edma-pcie) and program it per channel.
Endpoint-local chip instances keep func_no at 0, so transfers issued by
the endpoint-side driver remain PF0-attributed. Delegated channels are
programmed by the host-side dw-edma-pcie instance when it takes over the
channel, using that instance's PCI_FUNC().
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Link: https://patch.msgid.link/20260721062815.4117887-15-den@valinux.co.jp
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include/linux/dma')
| -rw-r--r-- | include/linux/dma/edma.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h index 2ce9d2d49aef..3c8e2ef9dee0 100644 --- a/include/linux/dma/edma.h +++ b/include/linux/dma/edma.h @@ -117,6 +117,7 @@ enum dw_edma_ch_irq_mode { * @db_irq: Virtual IRQ dedicated to interrupt emulation * @db_offset: Offset from DMA register base * @mf: DMA register map format + * @func_no: PCI endpoint function number used by DMA TLPs * @dw: struct dw_edma that is filled by dw_edma_probe() */ struct dw_edma_chip { @@ -142,6 +143,7 @@ struct dw_edma_chip { resource_size_t db_offset; enum dw_edma_map_format mf; + u8 func_no; struct dw_edma *dw; bool cfg_non_ll; |