Hi,
This small series contains standalone refactoring and new infrastructure
for dmaengine and dw-edma.
It prepares PCIe EPC-local DMA channels for remote use. The upcoming
vNTB-embedded DMA support [1] will be the first user and depend on this
series.
[1] https://lore.kernel.org/r/20260903082327.2345602-1-den@valinux.co.jp/
Best regards,
Koichiro
---
Changes in v4:
- Drop unnecessary READ_ONCE()/WRITE_ONCE() for irq_mode. (Frank)
- Allow repeated dmaengine_slave_config() calls on idle channels when
the IRQ mode is unchanged. (Sashiko)
- Extend patch 2 to support native HDMA.
- Simplify IRQ mode handling, assuming the channel has no pending
interrupt status when its mode changes. Treat racing reads by shared
IRQ handlers and same-value stores on release as harmless.
- No changes in patches 1 and 3.
Changes in v3:
- Rework patch 2 to use a common channel configuration, retain generic
dma_slave_config fields, and close the shared-IRQ routing race.
(Frank, Sashiko)
- No code changes in patches 1 and 3.
Changes in v2:
- Split and rework vNTB v1 patches 1, 4, and 5 into this prerequisite
series.
- Fold in the relevant PCI DMA EPF v7 review.
v3: https://lore.kernel.org/r/20260903064533.2269557-1-den@valinux.co.jp/
v2: https://lore.kernel.org/r/20260828163611.2691264-1-den@valinux.co.jp/
v1: https://lore.kernel.org/r/20260312165005.1148676-1-den@valinux.co.jp/
Koichiro Den (3):
dmaengine: Allow drivers to assign static channel IDs
dmaengine: dw-edma: Configure remote interrupt routing
dmaengine: dw-edma: Account for the MSI vector offset
drivers/dma/dmaengine.c | 13 ++-
drivers/dma/dw-edma/dw-edma-core.c | 161 +++++++++++++++++++++--------
include/linux/dma/edma.h | 21 ++++
include/linux/dmaengine.h | 20 ++++
4 files changed, 169 insertions(+), 46 deletions(-)
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
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2.51.0