tools/perf/util/arm-spe-decoder/arm-spe-decoder.c

Source file repositories/reference/linux-study-clean/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
Extension
.c
Size
8571 bytes
Lines
302
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!(seen_idx & BIT(index))) {
			seen_idx |= BIT(index);
			pr_warning("ignoring unsupported address packet index: 0x%x\n", index);
		}
	}

	return payload;
}

struct arm_spe_decoder *arm_spe_decoder_new(struct arm_spe_params *params)
{
	struct arm_spe_decoder *decoder;

	if (!params->get_trace)
		return NULL;

	decoder = zalloc(sizeof(struct arm_spe_decoder));
	if (!decoder)
		return NULL;

	decoder->get_trace = params->get_trace;
	decoder->data = params->data;

	return decoder;
}

void arm_spe_decoder_free(struct arm_spe_decoder *decoder)
{
	free(decoder);
}

static int arm_spe_get_data(struct arm_spe_decoder *decoder)
{
	struct arm_spe_buffer buffer = { .buf = 0, };
	int ret;

	pr_debug("Getting more data\n");
	ret = decoder->get_trace(&buffer, decoder->data);
	if (ret < 0)
		return ret;

	decoder->buf = buffer.buf;
	decoder->len = buffer.len;

	if (!decoder->len)
		pr_debug("No more data\n");

	return decoder->len;
}

static int arm_spe_get_next_packet(struct arm_spe_decoder *decoder)
{
	int ret;

	do {
		if (!decoder->len) {
			ret = arm_spe_get_data(decoder);

			/* Failed to read out trace data */
			if (ret <= 0)
				return ret;
		}

		ret = arm_spe_get_packet(decoder->buf, decoder->len,
					 &decoder->packet);
		if (ret <= 0) {
			/* Move forward for 1 byte */
			decoder->buf += 1;
			decoder->len -= 1;
			return -EBADMSG;
		}

		decoder->buf += ret;
		decoder->len -= ret;
	} while (decoder->packet.type == ARM_SPE_PAD);

	return 1;
}

static int arm_spe_read_record(struct arm_spe_decoder *decoder)
{
	int err;
	int idx;
	u64 payload, ip;

	memset(&decoder->record, 0x0, sizeof(decoder->record));
	decoder->record.context_id = (u64)-1;

	while (1) {
		err = arm_spe_get_next_packet(decoder);

Annotation

Implementation Notes