trace.c

/*
 * NVM Express device driver tracepoints
 * Copyright (c) 2018 Johannes Thumshirn, SUSE Linux GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <asm/unaligned.h>
#include "trace.h"

static const char *nvme_trace_create_sq(struct trace_seq *p, u8 *cdw10)
{
	const char *ret = trace_seq_buffer_ptr(p);
	u16 sqid = get_unaligned_le16(cdw10);
	u16 qsize = get_unaligned_le16(cdw10 + 2);
	u16 sq_flags = get_unaligned_le16(cdw10 + 4);
	u16 cqid = get_unaligned_le16(cdw10 + 6);


	trace_seq_printf(p, "sqid=%u, qsize=%u, sq_flags=0x%x, cqid=%u",
			 sqid, qsize, sq_flags, cqid);
	trace_seq_putc(p, 0);

	return ret;
}

static const char *nvme_trace_create_cq(struct trace_seq *p, u8 *cdw10)
{
	const char *ret = trace_seq_buffer_ptr(p);
	u16 cqid = get_unaligned_le16(cdw10);
	u16 qsize = get_unaligned_le16(cdw10 + 2);
	u16 cq_flags = get_unaligned_le16(cdw10 + 4);
	u16 irq_vector = get_unaligned_le16(cdw10 + 6);

	trace_seq_printf(p, "cqid=%u, qsize=%u, cq_flags=0x%x, irq_vector=%u",
			 cqid, qsize, cq_flags, irq_vector);
	trace_seq_putc(p, 0);

	return ret;
}

static const char *nvme_trace_admin_identify(struct trace_seq *p, u8 *cdw10)
{
	const char *ret = trace_seq_buffer_ptr(p);
	u8 cns = cdw10[0];
	u16 ctrlid = get_unaligned_le16(cdw10 + 2);

	trace_seq_printf(p, "cns=%u, ctrlid=%u", cns, ctrlid);
	trace_seq_putc(p, 0);

	return ret;
}



static const char *nvme_trace_read_write(struct trace_seq *p, u8 *cdw10)
{
	const char *ret = trace_seq_buffer_ptr(p);
	u64 slba = get_unaligned_le64(cdw10);
	u16 length = get_unaligned_le16(cdw10 + 8);
	u16 control = get_unaligned_le16(cdw10 + 10);
	u32 dsmgmt = get_unaligned_le32(cdw10 + 12);
	u32 reftag = get_unaligned_le32(cdw10 +  16);

	trace_seq_printf(p,
			 "slba=%llu, len=%u, ctrl=0x%x, dsmgmt=%u, reftag=%u",
			 slba, length, control, dsmgmt, reftag);
	trace_seq_putc(p, 0);

	return ret;
}

static const char *nvme_trace_dsm(struct trace_seq *p, u8 *cdw10)
{
	const char *ret = trace_seq_buffer_ptr(p);

	trace_seq_printf(p, "nr=%u, attributes=%u",
			 get_unaligned_le32(cdw10),
			 get_unaligned_le32(cdw10 + 4));
	trace_seq_putc(p, 0);

	return ret;
}

static const char *nvme_trace_common(struct trace_seq *p, u8 *cdw10)
{
	const char *ret = trace_seq_buffer_ptr(p);

	trace_seq_printf(p, "cdw10=%*ph", 24, cdw10);
	trace_seq_putc(p, 0);

	return ret;
}

const char *nvme_trace_parse_admin_cmd(struct trace_seq *p,
				       u8 opcode, u8 *cdw10)
{
	switch (opcode) {
	case nvme_admin_create_sq:
		return nvme_trace_create_sq(p, cdw10);
	case nvme_admin_create_cq:
		return nvme_trace_create_cq(p, cdw10);
	case nvme_admin_identify:
		return nvme_trace_admin_identify(p, cdw10);
	default:
		return nvme_trace_common(p, cdw10);
	}
}

const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p,
				     u8 opcode, u8 *cdw10)
{
	switch (opcode) {
	case nvme_cmd_read:
	case nvme_cmd_write:
	case nvme_cmd_write_zeroes:
		return nvme_trace_read_write(p, cdw10);
	case nvme_cmd_dsm:
		return nvme_trace_dsm(p, cdw10);
	default:
		return nvme_trace_common(p, cdw10);
	}
}