drivers/gpu/drm/amd/amdgpu/smuio_v15_0_0.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/amdgpu/smuio_v15_0_0.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/amdgpu/smuio_v15_0_0.c
Extension
.c
Size
2130 bytes
Lines
51
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#include "amdgpu.h"
#include "smuio_v15_0_0.h"
#include "smuio/smuio_15_0_0_offset.h"
#include "smuio/smuio_15_0_0_sh_mask.h"
#include <linux/preempt.h>

static u64 smuio_v15_0_0_get_gpu_clock_counter(struct amdgpu_device *adev)
{
	u64 clock;
	u64 clock_counter_lo, clock_counter_hi_pre, clock_counter_hi_after;

	preempt_disable();
	clock_counter_hi_pre = (u64)RREG32_SOC15(SMUIO, 0, regGOLDEN_TSC_COUNT_UPPER);
	clock_counter_lo = (u64)RREG32_SOC15(SMUIO, 0, regGOLDEN_TSC_COUNT_LOWER);
	/* the clock counter may be udpated during polling the counters */
	clock_counter_hi_after = (u64)RREG32_SOC15(SMUIO, 0, regGOLDEN_TSC_COUNT_UPPER);
	if (clock_counter_hi_pre != clock_counter_hi_after)
		clock_counter_lo = (u64)RREG32_SOC15(SMUIO, 0, regGOLDEN_TSC_COUNT_LOWER);
	preempt_enable();

	clock = clock_counter_lo | (clock_counter_hi_after << 32ULL);

	return clock;
}

const struct amdgpu_smuio_funcs smuio_v15_0_0_funcs = {
	.get_gpu_clock_counter = smuio_v15_0_0_get_gpu_clock_counter,
};

Annotation

Implementation Notes