drivers/dma/ioat/registers.h
Source file repositories/reference/linux-study-clean/drivers/dma/ioat/registers.h
File Facts
- System
- Linux kernel
- Corpus path
drivers/dma/ioat/registers.h- Extension
.h- Size
- 9675 bytes
- Lines
- 252
- Domain
- Driver Families
- Bucket
- drivers/dma
- Inferred role
- Driver Families: implementation source
- Status
- source 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.
- Touches IRQ or DMA behavior; this matters for the representative real-device path.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
#ifndef _IOAT_REGISTERS_H_
#define _IOAT_REGISTERS_H_
#define IOAT_PCI_DMACTRL_OFFSET 0x48
#define IOAT_PCI_DMACTRL_DMA_EN 0x00000001
#define IOAT_PCI_DMACTRL_MSI_EN 0x00000002
#define IOAT_PCI_DEVICE_ID_OFFSET 0x02
#define IOAT_PCI_DMAUNCERRSTS_OFFSET 0x148
#define IOAT_PCI_CHANERR_INT_OFFSET 0x180
#define IOAT_PCI_CHANERRMASK_INT_OFFSET 0x184
/* MMIO Device Registers */
#define IOAT_CHANCNT_OFFSET 0x00 /* 8-bit */
#define IOAT_XFERCAP_OFFSET 0x01 /* 8-bit */
#define IOAT_XFERCAP_4KB 12
#define IOAT_XFERCAP_8KB 13
#define IOAT_XFERCAP_16KB 14
#define IOAT_XFERCAP_32KB 15
#define IOAT_XFERCAP_32GB 0
#define IOAT_GENCTRL_OFFSET 0x02 /* 8-bit */
#define IOAT_GENCTRL_DEBUG_EN 0x01
#define IOAT_INTRCTRL_OFFSET 0x03 /* 8-bit */
#define IOAT_INTRCTRL_MASTER_INT_EN 0x01 /* Master Interrupt Enable */
#define IOAT_INTRCTRL_INT_STATUS 0x02 /* ATTNSTATUS -or- Channel Int */
#define IOAT_INTRCTRL_INT 0x04 /* INT_STATUS -and- MASTER_INT_EN */
#define IOAT_INTRCTRL_MSIX_VECTOR_CONTROL 0x08 /* Enable all MSI-X vectors */
#define IOAT_ATTNSTATUS_OFFSET 0x04 /* Each bit is a channel */
#define IOAT_VER_OFFSET 0x08 /* 8-bit */
#define IOAT_VER_MAJOR_MASK 0xF0
#define IOAT_VER_MINOR_MASK 0x0F
#define GET_IOAT_VER_MAJOR(x) (((x) & IOAT_VER_MAJOR_MASK) >> 4)
#define GET_IOAT_VER_MINOR(x) ((x) & IOAT_VER_MINOR_MASK)
#define IOAT_PERPORTOFFSET_OFFSET 0x0A /* 16-bit */
#define IOAT_INTRDELAY_OFFSET 0x0C /* 16-bit */
#define IOAT_INTRDELAY_MASK 0x3FFF /* Interrupt Delay Time */
#define IOAT_INTRDELAY_COALESE_SUPPORT 0x8000 /* Interrupt Coalescing Supported */
#define IOAT_DEVICE_STATUS_OFFSET 0x0E /* 16-bit */
#define IOAT_DEVICE_STATUS_DEGRADED_MODE 0x0001
#define IOAT_DEVICE_MMIO_RESTRICTED 0x0002
#define IOAT_DEVICE_MEMORY_BYPASS 0x0004
#define IOAT_DEVICE_ADDRESS_REMAPPING 0x0008
#define IOAT_DMA_CAP_OFFSET 0x10 /* 32-bit */
#define IOAT_CAP_PAGE_BREAK 0x00000001
#define IOAT_CAP_CRC 0x00000002
#define IOAT_CAP_SKIP_MARKER 0x00000004
#define IOAT_CAP_DCA 0x00000010
#define IOAT_CAP_CRC_MOVE 0x00000020
#define IOAT_CAP_FILL_BLOCK 0x00000040
#define IOAT_CAP_APIC 0x00000080
#define IOAT_CAP_XOR 0x00000100
#define IOAT_CAP_PQ 0x00000200
#define IOAT_CAP_DWBES 0x00002000
#define IOAT_CAP_RAID16SS 0x00020000
#define IOAT_CAP_DPS 0x00800000
#define IOAT_PREFETCH_LIMIT_OFFSET 0x4C /* CHWPREFLMT */
#define IOAT_CHANNEL_MMIO_SIZE 0x80 /* Each Channel MMIO space is this size */
/* DMA Channel Registers */
#define IOAT_CHANCTRL_OFFSET 0x00 /* 16-bit Channel Control Register */
#define IOAT_CHANCTRL_CHANNEL_PRIORITY_MASK 0xF000
#define IOAT3_CHANCTRL_COMPL_DCA_EN 0x0200
#define IOAT_CHANCTRL_CHANNEL_IN_USE 0x0100
#define IOAT_CHANCTRL_DESCRIPTOR_ADDR_SNOOP_CONTROL 0x0020
#define IOAT_CHANCTRL_ERR_INT_EN 0x0010
#define IOAT_CHANCTRL_ANY_ERR_ABORT_EN 0x0008
#define IOAT_CHANCTRL_ERR_COMPLETION_EN 0x0004
#define IOAT_CHANCTRL_INT_REARM 0x0001
#define IOAT_CHANCTRL_RUN (IOAT_CHANCTRL_INT_REARM |\
IOAT_CHANCTRL_ERR_INT_EN |\
IOAT_CHANCTRL_ERR_COMPLETION_EN |\
IOAT_CHANCTRL_ANY_ERR_ABORT_EN)
#define IOAT_DMA_COMP_OFFSET 0x02 /* 16-bit DMA channel compatibility */
#define IOAT_DMA_COMP_V1 0x0001 /* Compatibility with DMA version 1 */
#define IOAT_DMA_COMP_V2 0x0002 /* Compatibility with DMA version 2 */
#define IOAT_CHANSTS_OFFSET 0x08 /* 64-bit Channel Status Register */
#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL)
Annotation
- Atlas domain: Driver Families / drivers/dma.
- Implementation status: source implementation candidate.
- 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.