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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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net/mlx5: FW tracer, events handling
The tracer has one event, event 0x26, with two subtypes: - Subtype 0: Ownership change - Subtype 1: Traces available An ownership change occurs in the following cases: 1- Owner releases his ownership, in this case, an event will be sent to inform others to reattempt acquire ownership. 2- Ownership was taken by a higher priority tool, in this case the owner should understand that it lost ownership, and go through tear down flow. The second subtype indicates that there are traces in the trace buffer, in this case, the driver polls the tracer buffer for new traces, parse them and prepares the messages for printing. The HW starts tracing from the first address in the tracer buffer. Driver receives an event notifying that new trace block exists. HW posts a timestamp event at the last 8B of every 256B block. Comparing the timestamp to the last handled timestamp would indicate that this is a new trace block. Once the new timestamp is detected, the entire block is considered valid. Block validation and parsing, should be done after copying the current block to a different location, in order to avoid block overwritten during processing. Signed-off-by: Feras Daoud <ferasda@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
parent
e9cad2cea7
commit
c71ad41ccb
4 changed files with 349 additions and 12 deletions
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@ -318,25 +318,244 @@ static void mlx5_tracer_read_strings_db(struct work_struct *work)
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return;
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}
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static void mlx5_fw_tracer_ownership_change(struct work_struct *work)
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static void mlx5_fw_tracer_arm(struct mlx5_core_dev *dev)
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{
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struct mlx5_fw_tracer *tracer = container_of(work, struct mlx5_fw_tracer,
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ownership_change_work);
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struct mlx5_core_dev *dev = tracer->dev;
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u32 out[MLX5_ST_SZ_DW(mtrc_ctrl)] = {0};
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u32 in[MLX5_ST_SZ_DW(mtrc_ctrl)] = {0};
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int err;
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if (tracer->owner) {
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mlx5_fw_tracer_ownership_release(tracer);
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return;
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MLX5_SET(mtrc_ctrl, in, arm_event, 1);
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err = mlx5_core_access_reg(dev, in, sizeof(in), out, sizeof(out),
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MLX5_REG_MTRC_CTRL, 0, 1);
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if (err)
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mlx5_core_warn(dev, "FWTracer: Failed to arm tracer event %d\n", err);
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}
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static void poll_trace(struct mlx5_fw_tracer *tracer,
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struct tracer_event *tracer_event, u64 *trace)
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{
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u32 timestamp_low, timestamp_mid, timestamp_high, urts;
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tracer_event->event_id = MLX5_GET(tracer_event, trace, event_id);
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tracer_event->lost_event = MLX5_GET(tracer_event, trace, lost);
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switch (tracer_event->event_id) {
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case TRACER_EVENT_TYPE_TIMESTAMP:
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tracer_event->type = TRACER_EVENT_TYPE_TIMESTAMP;
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urts = MLX5_GET(tracer_timestamp_event, trace, urts);
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if (tracer->trc_ver == 0)
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tracer_event->timestamp_event.unreliable = !!(urts >> 2);
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else
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tracer_event->timestamp_event.unreliable = !!(urts & 1);
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timestamp_low = MLX5_GET(tracer_timestamp_event,
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trace, timestamp7_0);
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timestamp_mid = MLX5_GET(tracer_timestamp_event,
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trace, timestamp39_8);
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timestamp_high = MLX5_GET(tracer_timestamp_event,
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trace, timestamp52_40);
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tracer_event->timestamp_event.timestamp =
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((u64)timestamp_high << 40) |
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((u64)timestamp_mid << 8) |
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(u64)timestamp_low;
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break;
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default:
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if (tracer_event->event_id >= tracer->str_db.first_string_trace ||
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tracer_event->event_id <= tracer->str_db.first_string_trace +
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tracer->str_db.num_string_trace) {
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tracer_event->type = TRACER_EVENT_TYPE_STRING;
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tracer_event->string_event.timestamp =
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MLX5_GET(tracer_string_event, trace, timestamp);
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tracer_event->string_event.string_param =
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MLX5_GET(tracer_string_event, trace, string_param);
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tracer_event->string_event.tmsn =
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MLX5_GET(tracer_string_event, trace, tmsn);
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tracer_event->string_event.tdsn =
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MLX5_GET(tracer_string_event, trace, tdsn);
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} else {
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tracer_event->type = TRACER_EVENT_TYPE_UNRECOGNIZED;
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}
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break;
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}
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}
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static u64 get_block_timestamp(struct mlx5_fw_tracer *tracer, u64 *ts_event)
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{
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struct tracer_event tracer_event;
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u8 event_id;
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event_id = MLX5_GET(tracer_event, ts_event, event_id);
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if (event_id == TRACER_EVENT_TYPE_TIMESTAMP)
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poll_trace(tracer, &tracer_event, ts_event);
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else
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tracer_event.timestamp_event.timestamp = 0;
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return tracer_event.timestamp_event.timestamp;
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}
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static void mlx5_fw_tracer_handle_traces(struct work_struct *work)
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{
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struct mlx5_fw_tracer *tracer =
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container_of(work, struct mlx5_fw_tracer, handle_traces_work);
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u64 block_timestamp, last_block_timestamp, tmp_trace_block[TRACES_PER_BLOCK];
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u32 block_count, start_offset, prev_start_offset, prev_consumer_index;
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u32 trace_event_size = MLX5_ST_SZ_BYTES(tracer_event);
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struct tracer_event tracer_event;
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struct mlx5_core_dev *dev;
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int i;
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if (!tracer->owner)
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return;
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dev = tracer->dev;
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block_count = tracer->buff.size / TRACER_BLOCK_SIZE_BYTE;
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start_offset = tracer->buff.consumer_index * TRACER_BLOCK_SIZE_BYTE;
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/* Copy the block to local buffer to avoid HW override while being processed*/
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memcpy(tmp_trace_block, tracer->buff.log_buf + start_offset,
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TRACER_BLOCK_SIZE_BYTE);
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block_timestamp =
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get_block_timestamp(tracer, &tmp_trace_block[TRACES_PER_BLOCK - 1]);
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while (block_timestamp > tracer->last_timestamp) {
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/* Check block override if its not the first block */
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if (!tracer->last_timestamp) {
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u64 *ts_event;
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/* To avoid block override be the HW in case of buffer
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* wraparound, the time stamp of the previous block
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* should be compared to the last timestamp handled
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* by the driver.
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*/
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prev_consumer_index =
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(tracer->buff.consumer_index - 1) & (block_count - 1);
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prev_start_offset = prev_consumer_index * TRACER_BLOCK_SIZE_BYTE;
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ts_event = tracer->buff.log_buf + prev_start_offset +
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(TRACES_PER_BLOCK - 1) * trace_event_size;
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last_block_timestamp = get_block_timestamp(tracer, ts_event);
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/* If previous timestamp different from last stored
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* timestamp then there is a good chance that the
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* current buffer is overwritten and therefore should
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* not be parsed.
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*/
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if (tracer->last_timestamp != last_block_timestamp) {
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mlx5_core_warn(dev, "FWTracer: Events were lost\n");
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tracer->last_timestamp = block_timestamp;
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tracer->buff.consumer_index =
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(tracer->buff.consumer_index + 1) & (block_count - 1);
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break;
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}
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}
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/* Parse events */
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for (i = 0; i < TRACES_PER_BLOCK ; i++)
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poll_trace(tracer, &tracer_event, &tmp_trace_block[i]);
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tracer->buff.consumer_index =
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(tracer->buff.consumer_index + 1) & (block_count - 1);
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tracer->last_timestamp = block_timestamp;
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start_offset = tracer->buff.consumer_index * TRACER_BLOCK_SIZE_BYTE;
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memcpy(tmp_trace_block, tracer->buff.log_buf + start_offset,
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TRACER_BLOCK_SIZE_BYTE);
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block_timestamp = get_block_timestamp(tracer,
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&tmp_trace_block[TRACES_PER_BLOCK - 1]);
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}
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mlx5_fw_tracer_arm(dev);
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}
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static int mlx5_fw_tracer_set_mtrc_conf(struct mlx5_fw_tracer *tracer)
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{
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struct mlx5_core_dev *dev = tracer->dev;
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u32 out[MLX5_ST_SZ_DW(mtrc_conf)] = {0};
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u32 in[MLX5_ST_SZ_DW(mtrc_conf)] = {0};
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int err;
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MLX5_SET(mtrc_conf, in, trace_mode, TRACE_TO_MEMORY);
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MLX5_SET(mtrc_conf, in, log_trace_buffer_size,
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ilog2(TRACER_BUFFER_PAGE_NUM));
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MLX5_SET(mtrc_conf, in, trace_mkey, tracer->buff.mkey.key);
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err = mlx5_core_access_reg(dev, in, sizeof(in), out, sizeof(out),
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MLX5_REG_MTRC_CONF, 0, 1);
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if (err)
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mlx5_core_warn(dev, "FWTracer: Failed to set tracer configurations %d\n", err);
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return err;
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}
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static int mlx5_fw_tracer_set_mtrc_ctrl(struct mlx5_fw_tracer *tracer, u8 status, u8 arm)
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{
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struct mlx5_core_dev *dev = tracer->dev;
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u32 out[MLX5_ST_SZ_DW(mtrc_ctrl)] = {0};
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u32 in[MLX5_ST_SZ_DW(mtrc_ctrl)] = {0};
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int err;
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MLX5_SET(mtrc_ctrl, in, modify_field_select, TRACE_STATUS);
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MLX5_SET(mtrc_ctrl, in, trace_status, status);
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MLX5_SET(mtrc_ctrl, in, arm_event, arm);
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err = mlx5_core_access_reg(dev, in, sizeof(in), out, sizeof(out),
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MLX5_REG_MTRC_CTRL, 0, 1);
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if (!err && status)
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tracer->last_timestamp = 0;
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return err;
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}
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static int mlx5_fw_tracer_start(struct mlx5_fw_tracer *tracer)
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{
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struct mlx5_core_dev *dev = tracer->dev;
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int err;
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err = mlx5_fw_tracer_ownership_acquire(tracer);
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if (err) {
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mlx5_core_dbg(dev, "FWTracer: Ownership was not granted %d\n", err);
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return;
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/* Don't fail since ownership can be acquired on a later FW event */
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return 0;
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}
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err = mlx5_fw_tracer_set_mtrc_conf(tracer);
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if (err) {
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mlx5_core_warn(dev, "FWTracer: Failed to set tracer configuration %d\n", err);
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goto release_ownership;
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}
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/* enable tracer & trace events */
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err = mlx5_fw_tracer_set_mtrc_ctrl(tracer, 1, 1);
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if (err) {
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mlx5_core_warn(dev, "FWTracer: Failed to enable tracer %d\n", err);
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goto release_ownership;
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}
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return 0;
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release_ownership:
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mlx5_fw_tracer_ownership_release(tracer);
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return err;
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}
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static void mlx5_fw_tracer_ownership_change(struct work_struct *work)
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{
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struct mlx5_fw_tracer *tracer =
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container_of(work, struct mlx5_fw_tracer, ownership_change_work);
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if (tracer->owner) {
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tracer->owner = false;
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tracer->buff.consumer_index = 0;
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return;
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}
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mlx5_fw_tracer_start(tracer);
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}
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/* Create software resources (Buffers, etc ..) */
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struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
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{
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struct mlx5_fw_tracer *tracer = NULL;
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@ -361,6 +580,8 @@ struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
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INIT_WORK(&tracer->ownership_change_work, mlx5_fw_tracer_ownership_change);
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INIT_WORK(&tracer->read_fw_strings_work, mlx5_tracer_read_strings_db);
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INIT_WORK(&tracer->handle_traces_work, mlx5_fw_tracer_handle_traces);
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err = mlx5_query_mtrc_caps(tracer);
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if (err) {
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@ -392,6 +613,9 @@ struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
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return ERR_PTR(err);
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}
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/* Create HW resources + start tracer
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* must be called before Async EQ is created
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*/
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int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer)
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{
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struct mlx5_core_dev *dev;
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@ -417,22 +641,25 @@ int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer)
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goto err_dealloc_pd;
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}
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err = mlx5_fw_tracer_ownership_acquire(tracer);
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if (err) /* Don't fail since ownership can be acquired on a later FW event */
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mlx5_core_dbg(dev, "FWTracer: Ownership was not granted %d\n", err);
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mlx5_fw_tracer_start(tracer);
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return 0;
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err_dealloc_pd:
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mlx5_core_dealloc_pd(dev, tracer->buff.pdn);
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return err;
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}
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/* Stop tracer + Cleanup HW resources
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* must be called after Async EQ is destroyed
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*/
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void mlx5_fw_tracer_cleanup(struct mlx5_fw_tracer *tracer)
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{
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if (IS_ERR_OR_NULL(tracer))
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return;
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cancel_work_sync(&tracer->ownership_change_work);
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cancel_work_sync(&tracer->handle_traces_work);
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if (tracer->owner)
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mlx5_fw_tracer_ownership_release(tracer);
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@ -441,6 +668,7 @@ void mlx5_fw_tracer_cleanup(struct mlx5_fw_tracer *tracer)
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mlx5_core_dealloc_pd(tracer->dev, tracer->buff.pdn);
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}
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/* Free software resources (Buffers, etc ..) */
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void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer)
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{
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if (IS_ERR_OR_NULL(tracer))
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@ -454,4 +682,26 @@ void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer)
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kfree(tracer);
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}
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void mlx5_fw_tracer_event(struct mlx5_core_dev *dev, struct mlx5_eqe *eqe)
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{
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struct mlx5_fw_tracer *tracer = dev->tracer;
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if (!tracer)
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return;
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switch (eqe->sub_type) {
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case MLX5_TRACER_SUBTYPE_OWNERSHIP_CHANGE:
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if (test_bit(MLX5_INTERFACE_STATE_UP, &dev->intf_state))
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queue_work(tracer->work_queue, &tracer->ownership_change_work);
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break;
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case MLX5_TRACER_SUBTYPE_TRACES_AVAILABLE:
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if (likely(tracer->str_db.loaded))
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queue_work(tracer->work_queue, &tracer->handle_traces_work);
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break;
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default:
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mlx5_core_dbg(dev, "FWTracer: Event with unrecognized subtype: sub_type %d\n",
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eqe->sub_type);
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}
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}
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EXPORT_TRACEPOINT_SYMBOL(mlx5_fw);
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@ -43,6 +43,9 @@
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#define TRACER_BUFFER_CHUNK 4096
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#define TRACE_BUFFER_SIZE_BYTE (TRACER_BUFFER_PAGE_NUM * TRACER_BUFFER_CHUNK)
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#define TRACER_BLOCK_SIZE_BYTE 256
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#define TRACES_PER_BLOCK 32
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struct mlx5_fw_tracer {
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struct mlx5_core_dev *dev;
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bool owner;
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@ -69,8 +72,11 @@ struct mlx5_fw_tracer {
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dma_addr_t dma;
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u32 size;
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struct mlx5_core_mkey mkey;
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u32 consumer_index;
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} buff;
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u64 last_timestamp;
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struct work_struct handle_traces_work;
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};
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enum mlx5_fw_tracer_ownership_state {
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@ -78,7 +84,70 @@ enum mlx5_fw_tracer_ownership_state {
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MLX5_FW_TRACER_ACQUIRE_OWNERSHIP,
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};
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enum tracer_ctrl_fields_select {
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TRACE_STATUS = 1 << 0,
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};
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enum tracer_event_type {
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TRACER_EVENT_TYPE_STRING,
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TRACER_EVENT_TYPE_TIMESTAMP = 0xFF,
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TRACER_EVENT_TYPE_UNRECOGNIZED,
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};
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enum tracing_mode {
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TRACE_TO_MEMORY = 1 << 0,
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};
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struct tracer_timestamp_event {
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u64 timestamp;
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u8 unreliable;
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};
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struct tracer_string_event {
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u32 timestamp;
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u32 tmsn;
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u32 tdsn;
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u32 string_param;
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};
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struct tracer_event {
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bool lost_event;
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u32 type;
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u8 event_id;
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union {
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struct tracer_string_event string_event;
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struct tracer_timestamp_event timestamp_event;
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};
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};
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struct mlx5_ifc_tracer_event_bits {
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u8 lost[0x1];
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u8 timestamp[0x7];
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u8 event_id[0x8];
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u8 event_data[0x30];
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};
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struct mlx5_ifc_tracer_string_event_bits {
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u8 lost[0x1];
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u8 timestamp[0x7];
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u8 event_id[0x8];
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u8 tmsn[0xd];
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u8 tdsn[0x3];
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u8 string_param[0x20];
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};
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struct mlx5_ifc_tracer_timestamp_event_bits {
|
||||
u8 timestamp7_0[0x8];
|
||||
u8 event_id[0x8];
|
||||
u8 urts[0x3];
|
||||
u8 timestamp52_40[0xd];
|
||||
u8 timestamp39_8[0x20];
|
||||
};
|
||||
|
||||
struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev);
|
||||
int mlx5_fw_tracer_init(struct mlx5_fw_tracer *tracer);
|
||||
void mlx5_fw_tracer_cleanup(struct mlx5_fw_tracer *tracer);
|
||||
void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer);
|
||||
void mlx5_fw_tracer_event(struct mlx5_core_dev *dev, struct mlx5_eqe *eqe) { return; }
|
||||
|
||||
#endif
|
||||
|
|
|
@ -40,6 +40,7 @@
|
|||
#include "mlx5_core.h"
|
||||
#include "fpga/core.h"
|
||||
#include "eswitch.h"
|
||||
#include "diag/fw_tracer.h"
|
||||
|
||||
enum {
|
||||
MLX5_EQE_SIZE = sizeof(struct mlx5_eqe),
|
||||
|
@ -168,6 +169,8 @@ static const char *eqe_type_str(u8 type)
|
|||
return "MLX5_EVENT_TYPE_FPGA_QP_ERROR";
|
||||
case MLX5_EVENT_TYPE_GENERAL_EVENT:
|
||||
return "MLX5_EVENT_TYPE_GENERAL_EVENT";
|
||||
case MLX5_EVENT_TYPE_DEVICE_TRACER:
|
||||
return "MLX5_EVENT_TYPE_DEVICE_TRACER";
|
||||
default:
|
||||
return "Unrecognized event";
|
||||
}
|
||||
|
@ -576,6 +579,11 @@ static irqreturn_t mlx5_eq_int(int irq, void *eq_ptr)
|
|||
case MLX5_EVENT_TYPE_GENERAL_EVENT:
|
||||
general_event_handler(dev, eqe);
|
||||
break;
|
||||
|
||||
case MLX5_EVENT_TYPE_DEVICE_TRACER:
|
||||
mlx5_fw_tracer_event(dev, eqe);
|
||||
break;
|
||||
|
||||
default:
|
||||
mlx5_core_warn(dev, "Unhandled event 0x%x on EQ 0x%x\n",
|
||||
eqe->type, eq->eqn);
|
||||
|
@ -853,6 +861,9 @@ int mlx5_start_eqs(struct mlx5_core_dev *dev)
|
|||
if (MLX5_CAP_GEN(dev, temp_warn_event))
|
||||
async_event_mask |= (1ull << MLX5_EVENT_TYPE_TEMP_WARN_EVENT);
|
||||
|
||||
if (MLX5_CAP_MCAM_REG(dev, tracer_registers))
|
||||
async_event_mask |= (1ull << MLX5_EVENT_TYPE_DEVICE_TRACER);
|
||||
|
||||
err = mlx5_create_map_eq(dev, &table->cmd_eq, MLX5_EQ_VEC_CMD,
|
||||
MLX5_NUM_CMD_EQE, 1ull << MLX5_EVENT_TYPE_CMD,
|
||||
"mlx5_cmd_eq", MLX5_EQ_TYPE_ASYNC);
|
||||
|
|
|
@ -332,6 +332,13 @@ enum mlx5_event {
|
|||
|
||||
MLX5_EVENT_TYPE_FPGA_ERROR = 0x20,
|
||||
MLX5_EVENT_TYPE_FPGA_QP_ERROR = 0x21,
|
||||
|
||||
MLX5_EVENT_TYPE_DEVICE_TRACER = 0x26,
|
||||
};
|
||||
|
||||
enum {
|
||||
MLX5_TRACER_SUBTYPE_OWNERSHIP_CHANGE = 0x0,
|
||||
MLX5_TRACER_SUBTYPE_TRACES_AVAILABLE = 0x1,
|
||||
};
|
||||
|
||||
enum {
|
||||
|
|
Loading…
Reference in a new issue