drivers/dma/sh/shdma-base.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/sh/shdma-base.c

Extension

.c

Size

28555 bytes

Lines

1064

Domain

Driver Families

Bucket

drivers/dma

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/delay.h
• linux/shdma-base.h
• linux/dmaengine.h
• linux/init.h
• linux/interrupt.h
• linux/module.h
• linux/pm_runtime.h
• linux/slab.h
• linux/spinlock.h
• ../dmaengine.h

Detected Declarations

• enum shdma_desc_status
• function shdma_chan_xfer_ld_queue
• function shdma_tx_submit
• function list_for_each_entry_safe
• function list_for_each_entry
• function shdma_setup_slave
• function shdma_alloc_chan_resources
• function ERR_PTR
• function __ld_cleanup
• function shdma_chan_ld_cleanup
• function shdma_free_chan_resources
• function public
• function shdma_terminate_all
• function shdma_config
• function shdma_issue_pending
• function shdma_tx_status
• function list_for_each_entry
• function shdma_reset
• function list_for_each_entry
• function chan_irq
• function chan_irqt
• function shdma_request_irq
• function shdma_chan_probe
• function shdma_chan_remove
• function shdma_init
• function shdma_cleanup
• function shdma_enter
• function shdma_exit
• module init shdma_enter
• export shdma_chan_filter
• export shdma_reset
• export shdma_request_irq
• export shdma_chan_probe
• export shdma_chan_remove
• export shdma_init
• export shdma_cleanup

Annotated Snippet

module_init(shdma_enter);

static void __exit shdma_exit(void)
{
	bitmap_free(shdma_slave_used);
}
module_exit(shdma_exit);

MODULE_DESCRIPTION("SH-DMA driver base library");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");

Annotation

• Immediate include surface: `linux/delay.h`, `linux/shdma-base.h`, `linux/dmaengine.h`, `linux/init.h`, `linux/interrupt.h`, `linux/module.h`, `linux/pm_runtime.h`, `linux/slab.h`.
• Detected declarations: `enum shdma_desc_status`, `function shdma_chan_xfer_ld_queue`, `function shdma_tx_submit`, `function list_for_each_entry_safe`, `function list_for_each_entry`, `function shdma_setup_slave`, `function shdma_alloc_chan_resources`, `function ERR_PTR`, `function __ld_cleanup`, `function shdma_chan_ld_cleanup`.
• Atlas domain: Driver Families / drivers/dma.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.