drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

Extension

.c

Size

13866 bytes

Lines

516

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/debugfs.h
• linux/errno.h
• linux/mutex.h
• linux/pm_opp.h
• linux/sort.h
• linux/clk.h
• linux/bitmap.h
• dpu_kms.h
• dpu_trace.h
• dpu_crtc.h
• dpu_core_perf.h

Detected Declarations

• enum dpu_perf_mode
• function dpu_core_perf_adjusted_mode_clk
• function _dpu_core_perf_calc_bw
• function drm_atomic_crtc_for_each_plane
• function _dpu_core_perf_calc_clk
• function drm_atomic_crtc_for_each_plane
• function _dpu_core_perf_calc_crtc
• function dpu_core_perf_aggregate
• function drm_for_each_crtc
• function dpu_core_perf_crtc_check
• function _dpu_core_perf_crtc_update_bus
• function dpu_core_perf_crtc_release_bw
• function _dpu_core_perf_get_core_clk_rate
• function dpu_core_perf_crtc_update
• function _dpu_core_perf_mode_write
• function _dpu_core_perf_mode_read
• function dpu_core_perf_debugfs_init
• function dpu_core_perf_init

Annotated Snippet

static const struct file_operations dpu_core_perf_mode_fops = {
	.open = simple_open,
	.read = _dpu_core_perf_mode_read,
	.write = _dpu_core_perf_mode_write,
};

/**
 * dpu_core_perf_debugfs_init - initialize debugfs for core performance context
 * @dpu_kms: Pointer to the dpu_kms struct
 * @parent: Pointer to parent debugfs
 */
int dpu_core_perf_debugfs_init(struct dpu_kms *dpu_kms, struct dentry *parent)
{
	struct dpu_core_perf *perf = &dpu_kms->perf;
	struct dentry *entry;

	entry = debugfs_create_dir("core_perf", parent);

	debugfs_create_u64("max_core_clk_rate", 0600, entry,
			&perf->max_core_clk_rate);
	debugfs_create_u64("core_clk_rate", 0600, entry,
			&perf->core_clk_rate);
	debugfs_create_u32("enable_bw_release", 0600, entry,
			(u32 *)&perf->enable_bw_release);
	debugfs_create_u32("low_core_ab", 0400, entry,
			(u32 *)&perf->perf_cfg->max_bw_low);
	debugfs_create_u32("max_core_ab", 0400, entry,
			(u32 *)&perf->perf_cfg->max_bw_high);
	debugfs_create_u32("min_core_ib", 0400, entry,
			(u32 *)&perf->perf_cfg->min_core_ib);
	debugfs_create_u32("min_llcc_ib", 0400, entry,
			(u32 *)&perf->perf_cfg->min_llcc_ib);
	debugfs_create_u32("min_dram_ib", 0400, entry,
			(u32 *)&perf->perf_cfg->min_dram_ib);
	debugfs_create_file("perf_mode", 0600, entry,
			(u32 *)perf, &dpu_core_perf_mode_fops);
	debugfs_create_u64("fix_core_clk_rate", 0600, entry,
			&perf->fix_core_clk_rate);
	debugfs_create_u32("fix_core_ib_vote", 0600, entry,
			&perf->fix_core_ib_vote);
	debugfs_create_u32("fix_core_ab_vote", 0600, entry,
			&perf->fix_core_ab_vote);

	return 0;
}
#endif

/**
 * dpu_core_perf_init - initialize the given core performance context
 * @perf: Pointer to core performance context
 * @perf_cfg: Pointer to platform performance configuration
 * @max_core_clk_rate: Maximum core clock rate
 */
int dpu_core_perf_init(struct dpu_core_perf *perf,
		const struct dpu_perf_cfg *perf_cfg,
		unsigned long max_core_clk_rate)
{
	perf->perf_cfg = perf_cfg;
	perf->max_core_clk_rate = max_core_clk_rate;

	return 0;
}

Annotation

• Immediate include surface: `linux/debugfs.h`, `linux/errno.h`, `linux/mutex.h`, `linux/pm_opp.h`, `linux/sort.h`, `linux/clk.h`, `linux/bitmap.h`, `dpu_kms.h`.
• Detected declarations: `enum dpu_perf_mode`, `function dpu_core_perf_adjusted_mode_clk`, `function _dpu_core_perf_calc_bw`, `function drm_atomic_crtc_for_each_plane`, `function _dpu_core_perf_calc_clk`, `function drm_atomic_crtc_for_each_plane`, `function _dpu_core_perf_calc_crtc`, `function dpu_core_perf_aggregate`, `function drm_for_each_crtc`, `function dpu_core_perf_crtc_check`.
• 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.