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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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604c01d567
Export the disk name, queue id, sq_head, sq_tail to a trace event in completion handling. Usage example: cd /sys/kernel/debug/tracing/events/nvme/nvme_sq echo 'disk=="nvme1n1"' > filter echo 1 > enable cat /sys/kernel/debug/tracing/trace_pipe Signed-off-by: yupeng <yupeng0921@gmail.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Keith Busch <keith.busch@intel.com> [hch: slight formatting tweaks, use standard nvme tracepoint conventions] Signed-off-by: Christoph Hellwig <hch@lst.de> wip
145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* NVM Express device driver tracepoints
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* Copyright (c) 2018 Johannes Thumshirn, SUSE Linux GmbH
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <asm/unaligned.h>
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#include "trace.h"
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static const char *nvme_trace_create_sq(struct trace_seq *p, u8 *cdw10)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u16 sqid = get_unaligned_le16(cdw10);
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u16 qsize = get_unaligned_le16(cdw10 + 2);
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u16 sq_flags = get_unaligned_le16(cdw10 + 4);
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u16 cqid = get_unaligned_le16(cdw10 + 6);
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trace_seq_printf(p, "sqid=%u, qsize=%u, sq_flags=0x%x, cqid=%u",
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sqid, qsize, sq_flags, cqid);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *nvme_trace_create_cq(struct trace_seq *p, u8 *cdw10)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u16 cqid = get_unaligned_le16(cdw10);
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u16 qsize = get_unaligned_le16(cdw10 + 2);
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u16 cq_flags = get_unaligned_le16(cdw10 + 4);
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u16 irq_vector = get_unaligned_le16(cdw10 + 6);
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trace_seq_printf(p, "cqid=%u, qsize=%u, cq_flags=0x%x, irq_vector=%u",
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cqid, qsize, cq_flags, irq_vector);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *nvme_trace_admin_identify(struct trace_seq *p, u8 *cdw10)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u8 cns = cdw10[0];
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u16 ctrlid = get_unaligned_le16(cdw10 + 2);
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trace_seq_printf(p, "cns=%u, ctrlid=%u", cns, ctrlid);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *nvme_trace_read_write(struct trace_seq *p, u8 *cdw10)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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u64 slba = get_unaligned_le64(cdw10);
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u16 length = get_unaligned_le16(cdw10 + 8);
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u16 control = get_unaligned_le16(cdw10 + 10);
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u32 dsmgmt = get_unaligned_le32(cdw10 + 12);
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u32 reftag = get_unaligned_le32(cdw10 + 16);
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trace_seq_printf(p,
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"slba=%llu, len=%u, ctrl=0x%x, dsmgmt=%u, reftag=%u",
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slba, length, control, dsmgmt, reftag);
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *nvme_trace_dsm(struct trace_seq *p, u8 *cdw10)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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trace_seq_printf(p, "nr=%u, attributes=%u",
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get_unaligned_le32(cdw10),
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get_unaligned_le32(cdw10 + 4));
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trace_seq_putc(p, 0);
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return ret;
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}
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static const char *nvme_trace_common(struct trace_seq *p, u8 *cdw10)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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trace_seq_printf(p, "cdw10=%*ph", 24, cdw10);
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trace_seq_putc(p, 0);
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return ret;
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}
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const char *nvme_trace_parse_admin_cmd(struct trace_seq *p,
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u8 opcode, u8 *cdw10)
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{
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switch (opcode) {
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case nvme_admin_create_sq:
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return nvme_trace_create_sq(p, cdw10);
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case nvme_admin_create_cq:
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return nvme_trace_create_cq(p, cdw10);
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case nvme_admin_identify:
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return nvme_trace_admin_identify(p, cdw10);
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default:
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return nvme_trace_common(p, cdw10);
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}
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}
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const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p,
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u8 opcode, u8 *cdw10)
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{
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switch (opcode) {
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case nvme_cmd_read:
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case nvme_cmd_write:
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case nvme_cmd_write_zeroes:
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return nvme_trace_read_write(p, cdw10);
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case nvme_cmd_dsm:
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return nvme_trace_dsm(p, cdw10);
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default:
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return nvme_trace_common(p, cdw10);
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}
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}
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const char *nvme_trace_disk_name(struct trace_seq *p, char *name)
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{
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const char *ret = trace_seq_buffer_ptr(p);
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if (*name)
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trace_seq_printf(p, "disk=%s, ", name);
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trace_seq_putc(p, 0);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvme_trace_disk_name);
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EXPORT_TRACEPOINT_SYMBOL_GPL(nvme_sq);
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