drivers/gpu/drm/i915/selftests/igt_atomic.c
Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/selftests/igt_atomic.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpu/drm/i915/selftests/igt_atomic.c- Extension
.c- Size
- 750 bytes
- Lines
- 48
- Domain
- Driver Families
- Bucket
- drivers/gpu
- 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.
- 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/preempt.hlinux/bottom_half.hlinux/irqflags.higt_atomic.h
Detected Declarations
function __preempt_beginfunction __preempt_endfunction __softirq_beginfunction __softirq_endfunction __hardirq_beginfunction __hardirq_end
Annotated Snippet
// SPDX-License-Identifier: MIT
/*
* Copyright © 2018 Intel Corporation
*/
#include <linux/preempt.h>
#include <linux/bottom_half.h>
#include <linux/irqflags.h>
#include "igt_atomic.h"
static void __preempt_begin(void)
{
preempt_disable();
}
static void __preempt_end(void)
{
preempt_enable();
}
static void __softirq_begin(void)
{
local_bh_disable();
}
static void __softirq_end(void)
{
local_bh_enable();
}
static void __hardirq_begin(void)
{
local_irq_disable();
}
static void __hardirq_end(void)
{
local_irq_enable();
}
const struct igt_atomic_section igt_atomic_phases[] = {
{ "preempt", __preempt_begin, __preempt_end },
{ "softirq", __softirq_begin, __softirq_end },
{ "hardirq", __hardirq_begin, __hardirq_end },
{ }
};
Annotation
- Immediate include surface: `linux/preempt.h`, `linux/bottom_half.h`, `linux/irqflags.h`, `igt_atomic.h`.
- Detected declarations: `function __preempt_begin`, `function __preempt_end`, `function __softirq_begin`, `function __softirq_end`, `function __hardirq_begin`, `function __hardirq_end`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source 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.