drivers/gpu/drm/tiny/cirrus-qemu.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/tiny/cirrus-qemu.c

Extension

.c

Size

17840 bytes

Lines

676

Domain

Driver Families

Bucket

drivers/gpu

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/aperture.h
• linux/iosys-map.h
• linux/module.h
• linux/pci.h
• video/cirrus.h
• video/vga.h
• drm/clients/drm_client_setup.h
• drm/drm_atomic.h
• drm/drm_atomic_helper.h
• drm/drm_atomic_state_helper.h
• drm/drm_connector.h
• drm/drm_damage_helper.h
• drm/drm_drv.h
• drm/drm_edid.h
• drm/drm_fbdev_shmem.h
• drm/drm_file.h
• drm/drm_format_helper.h
• drm/drm_fourcc.h
• drm/drm_framebuffer.h
• drm/drm_gem_atomic_helper.h
• drm/drm_gem_framebuffer_helper.h
• drm/drm_gem_shmem_helper.h
• drm/drm_ioctl.h
• drm/drm_managed.h
• drm/drm_modeset_helper_vtables.h
• drm/drm_module.h
• drm/drm_print.h
• drm/drm_probe_helper.h
• drm/drm_vblank.h
• drm/drm_vblank_helper.h

Detected Declarations

• struct cirrus_device
• function rreg_seq
• function wreg_seq
• function rreg_crt
• function wreg_crt
• function wreg_gfx
• function wreg_hdr
• function cirrus_set_start_address
• function cirrus_mode_set
• function cirrus_format_set
• function cirrus_pitch_set
• function cirrus_primary_plane_helper_atomic_check
• function cirrus_primary_plane_helper_atomic_update
• function cirrus_crtc_helper_atomic_check
• function cirrus_crtc_helper_atomic_enable
• function cirrus_connector_helper_get_modes
• function cirrus_pipe_init
• function cirrus_mode_config_mode_valid
• function cirrus_mode_config_init
• function cirrus_pci_probe
• function cirrus_pci_remove
• function cirrus_pci_shutdown

Annotated Snippet

static struct pci_driver cirrus_pci_driver = {
	.name = DRIVER_NAME,
	.id_table = pciidlist,
	.probe = cirrus_pci_probe,
	.remove = cirrus_pci_remove,
	.shutdown = cirrus_pci_shutdown,
};

drm_module_pci_driver(cirrus_pci_driver)

MODULE_DEVICE_TABLE(pci, pciidlist);
MODULE_DESCRIPTION("Cirrus driver for QEMU emulated device");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/aperture.h`, `linux/iosys-map.h`, `linux/module.h`, `linux/pci.h`, `video/cirrus.h`, `video/vga.h`, `drm/clients/drm_client_setup.h`, `drm/drm_atomic.h`.
• Detected declarations: `struct cirrus_device`, `function rreg_seq`, `function wreg_seq`, `function rreg_crt`, `function wreg_crt`, `function wreg_gfx`, `function wreg_hdr`, `function cirrus_set_start_address`, `function cirrus_mode_set`, `function cirrus_format_set`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: pattern implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.