Update JOURNAL
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JOURNAL.md
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JOURNAL.md
@ -4342,3 +4342,801 @@ It works, but very slowly:
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Let's add the ability to claim a context in the plictool, as I suspect the claim
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may be broken.
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## 2024-10-02
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Interesting output with ftrace:
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<<< NixOS Stage 1 >>>
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An error occurred in stage 1 of the boot process, which must mount the
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root filesystem on `/mnt-root' and then start stage 2. Press one
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of the following keys:
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i) to launch an interactive shell
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f) to start an interactive shell having pid 1 (needed if you want to
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start stage 2's init manually)
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r) to reboot immediately
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*) to ignore the error and continue
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iStarting interactive shell...
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~ # mount -t tracefs nodev /sys/kernel/tracing/
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~ # cd /sys/kernel/tracing/
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/sys/kernel/tracing # cat current_tracer
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function
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/sys/kernel/tracing # cat enabled_functions
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plic_irq_unmask (1)
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plic_irq_mask (1)
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plic_dying_cpu (1)
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plic_starting_cpu (1)
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plic_irq_domain_translate (1)
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plic_irq_domain_alloc (1)
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plic_parse_context_parent (1)
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plic_irq_set_type (1)
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plic_toggle.constprop.0 (1)
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plic_irq_eoi (1)
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plic_probe (1)
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plic_irq_suspend (1)
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plic_handle_irq (1)
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plic_irq_enable (1)
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plic_irq_disable (1)
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plic_irq_resume (1)
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/sys/kernel/tracing # cat tracing_on
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1
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/sys/kernel/tracing # cat trac
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trace trace_options tracing_max_latency
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trace_clock trace_pipe tracing_on
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trace_marker trace_stat/ tracing_thresh
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trace_marker_raw tracing_cpumask
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/sys/kernel/tracing # cat trace
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# tracer: function
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#
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# entries-in-buffer/entries-written: 1586/1586 #P:1
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...
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/sys/kernel/tracing # cat options/function-trace
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1
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 - 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # cat tracing_on
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1
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/sys/kernel/tracing # echo 0>tracing_on
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/sys/kernel/tracing # cat tracing_on
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1
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/sys/kernel/tracing # echo 0 > tracing_on
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/sys/kernel/tracing # cat tracing_on
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0
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/sys/kernel/tracing # echo plic_handle_irq > set_ftrace_filter
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/sys/kernel/tracing # cat enabled_functions
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plic_handle_irq (1)
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/sys/kernel/tracing # echo plic_handle_irq,plic_irq_eoi,plic_irq_enable,plic_irq
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_disable > set_ftrace_filter ^C
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/sys/kernel/tracing # echo plic_irq_eoi >> set_ftrace_filter
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/sys/kernel/tracing # cat enabled_functions
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plic_irq_eoi (1)
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plic_handle_irq (1)
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/sys/kernel/tracing # echo plic_irq_enable >> set_ftrace_filter
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 - 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # ^Ct enabled_functions
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/sys/kernel/tracing # echo hi > /dev/ttyS1
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^Z^C
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # echo plic_irq_enable >> set_f^Cace_filter
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/sys/kernel/tracing # cat tracing_on
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0
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/sys/kernel/tracing # echo 1 > tracing_on
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/sys/kernel/tracing # cat tracing_on
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1
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/sys/kernel/tracing # cat trace_pipe &
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/sys/kernel/tracing # fg
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cat trace_pipe
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^Z[1]+ Stopped cat trace_pipe
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/sys/kernel/tracing # bg
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[1] cat trace_pipe
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/sys/kernel/tracing # echo hi > /dev/ttyS1
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ash-91 [000] d..2. 669.966205: plic_irq_enable <-irq_enable
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ash-91 [000] d..2. 669.966815: plic_irq_enable <-irq_enable
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*** local echo: yes ***
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*** local echo: no ***
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^C
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/sys/kernel/tracing # echo 0 > tracing_on
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/sys/kernel/tracing # cat tracing_on
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0
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/sys/kernel/tracing # echo 'plic_*' >> set_ftrace_filter
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/sys/kernel/tracing # cat enabled_functions
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plic_irq_unmask (1)
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plic_irq_mask (1)
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plic_dying_cpu (1)
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plic_starting_cpu (1)
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plic_irq_domain_translate (1)
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plic_irq_domain_alloc (1)
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plic_parse_context_parent (1)
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plic_irq_set_type (1)
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plic_toggle.constprop.0 (1)
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plic_irq_eoi (1)
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plic_probe (1)
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plic_irq_suspend (1)
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plic_handle_irq (1)
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plic_irq_enable (1)
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plic_irq_disable (1)
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plic_irq_resume (1)
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/sys/kernel/tracing # echo 1 > tracing_on
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/sys/kernel/tracing # cat trace_pipe &
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/sys/kernel/tracing # cat: can't open 'trace_pipe': Device or resource busy
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[2]+ Done(1) cat trace_pipe
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/sys/kernel/tracing # ps
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PID USER TIME COMMAND
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1 0 0:33 {init} /nix/store/y477q6jlbg9b53knnclgib65fbzpazkj-extra-u
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2 0 0:00 [kthreadd]
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3 0 0:00 [pool_workqueue_]
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4 0 0:00 [kworker/R-slub_]
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5 0 0:00 [kworker/R-netns]
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6 0 0:00 [kworker/0:0-eve]
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7 0 0:00 [kworker/0:0H]
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8 0 0:03 [kworker/u4:0-ev]
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9 0 0:00 [kworker/R-mm_pe]
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10 0 0:41 [kworker/u4:1-ev]
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11 0 0:00 [rcu_tasks_rude_]
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12 0 0:00 [rcu_tasks_trace]
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13 0 0:00 [ksoftirqd/0]
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14 0 0:00 [kworker/0:1-eve]
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15 0 0:01 [kdevtmpfs]
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16 0 0:00 [kworker/R-inet_]
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17 0 0:00 [kauditd]
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18 0 0:00 [khungtaskd]
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20 0 0:00 [oom_reaper]
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21 0 0:00 [kworker/R-write]
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22 0 0:01 [kcompactd0]
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23 0 0:00 [ksmd]
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24 0 0:00 [kworker/R-kinte]
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25 0 0:00 [kworker/R-kbloc]
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26 0 0:00 [kworker/R-blkcg]
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27 0 0:00 [kworker/R-ata_s]
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28 0 0:00 [kworker/R-devfr]
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29 0 0:00 [watchdogd]
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30 0 0:01 [kworker/u4:3-ev]
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31 0 0:00 [kworker/R-rpcio]
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32 0 0:00 [kworker/R-xprti]
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33 0 0:00 [kswapd0]
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34 0 0:00 [kworker/R-nfsio]
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35 0 0:00 [kworker/R-kthro]
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36 0 0:09 [khvcd]
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37 0 0:00 [kworker/R-uas]
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38 0 0:00 [kworker/R-mld]
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39 0 0:00 [kworker/R-ipv6_]
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46 0 0:00 [kworker/R-kstrp]
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47 0 0:00 [kworker/u5:0]
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73 0 0:00 tee -i /proc/self/fd/8
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74 0 0:00 {init} /nix/store/y477q6jlbg9b53knnclgib65fbzpazkj-extra-u
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91 0 0:46 /nix/store/y477q6jlbg9b53knnclgib65fbzpazkj-extra-utils/bi
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113 0 0:00 cat trace_pipe
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117 0 0:00 ps
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/sys/kernel/tracing # fg
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cat trace_pipe
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^C
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/sys/kernel/tracing # cat trace_pipe &
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/sys/kernel/tracing # echo 1 > tracing_on
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/sys/kernel/tracing # echo hi > /dev/ttyS1
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ash-91 [000] d..2. 748.552248: plic_irq_enable <-irq_enable
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ash-91 [000] d..2. 748.552370: plic_toggle.constprop.0 <-plic_irq_enable
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ash-91 [000] d..2. 748.552797: plic_irq_disable <-irq_disable
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ash-91 [000] d..2. 748.552858: plic_toggle.constprop.0 <-plic_irq_disable
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ash-91 [000] d..2. 748.553102: plic_irq_enable <-irq_enable
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ash-91 [000] d..2. 748.553163: plic_toggle.constprop.0 <-plic_irq_enable
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^C
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/sys/kernel/tracing # ash-91 [000] d..2. 762.013481: plic_irq_disable <-__irq_disable
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ash-91 [000] d..2. 762.013603: plic_toggle.constprop.0 <-plic_irq_disable
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/sys/kernel/tracing #
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # plictool -C 1
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0
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/sys/kernel/tracing # plictool -C 1 -w 4
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/sys/kernel/tracing # plictool -C 1
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0
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # devmem 0x40014000 32 0xffffffff
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # plictool -C 1 -w 4
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # plictool -E
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plictool: option requires an argument: E
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plictool v0.0.5 -- Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
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Usage:
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plictool [-a addr] [-L] [-n nsrc] [-x nctx] # List (default)
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plictool [-a addr] -C ctx [-w value] # Claim
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plictool [-a addr] -T ctx [-w value] # Threshold
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plictool [-a addr] -I src [-w value] # Priority
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plictool [-a addr] -P src [-w value] # Pending
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plictool [-a addr] -E src -c ctx [-w value] # Enabled
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plictool -v # Version
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/sys/kernel/tracing # plictool -E 4 -c 0 -w 1
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 masked -
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36 - 0 masked -
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/sys/kernel/tracing # plictool -C 0
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4
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/sys/kernel/tracing # plictool -C 0 -w 4
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 - 1 masked -
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36 - 0 masked -
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/sys/kernel/tracing # plictool -E 4 -c 0 -w 0
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 - 1 - -
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/sys/kernel/tracing # cat /dev/ttyS1 &
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/sys/kernel/tracing # cat-136 [000] d..2. 887.106509: plic_irq_enable <-irq_enable
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cat-136 [000] d..2. 887.106631: plic_toggle.constprop.0 <-plic_irq_enable
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cat-136 [000] d.h2. 887.106814: plic_handle_irq <-generic_handle_domain_irq
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cat-136 [000] d.h3. 887.106997: plic_irq_eoi <-handle_fasteoi_irq
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cat-136 [000] d..2. 887.107424: plic_irq_disable <-irq_disable
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cat-136 [000] d..2. 887.107546: plic_toggle.constprop.0 <-plic_irq_disable
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cat-136 [000] d..2. 887.107729: plic_irq_enable <-irq_enable
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cat-136 [000] d..2. 887.107790: plic_toggle.constprop.0 <-plic_irq_enable
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - firing
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2 - 1 - -
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3 - 1 - -
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4 - 1 - -
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33 - 0 - masked
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So, then an interrupt is fired, we disable the interrupts and then we enable
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them again. Can this happen because the next interrupt fired when interrupts
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were disabled?
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There are also other cases in which we already have an interrupt pending and we
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enable the context 1. For example, by setting the enable bit, changing the prio,
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or the threshold for that context or by removing the context 0 enable bit.
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I think I can do some tests with those. I'm not sure why the serial port is
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firing an interrupt, but if this is the case, I can try to write a character in
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the transmit register and wait for the pending bit, then try to claim the
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interrupt for source 1.
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## 2024-10-03
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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/sys/kernel/tracing # cat tracing_on
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1
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/sys/kernel/tracing # echo 0 > tracing_on
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/sys/kernel/tracing # echo 1 > tracing_on
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/sys/kernel/tracing # cat trace_pipe &
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/sys/kernel/tracing # cat /dev/ttyS1 &
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/sys/kernel/tracing # cat-122 [000] ...1. 2978.202587: serial8250_pm <-uart_port_startup
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cat-122 [000] ...1. 2978.202648: serial8250_set_sleep <-serial8250_pm
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cat-122 [000] ...1. 2978.202892: serial8250_startup <-uart_port_startup
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cat-122 [000] ...1. 2978.203014: serial8250_do_startup <-serial8250_startup
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cat-122 [000] d..2. 2978.203319: plic_irq_enable <-irq_enable
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cat-122 [000] d..2. 2978.203380: plic_toggle.constprop.0 <-plic_irq_enable
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cat-122 [000] d.h2. 2978.203563: plic_handle_irq <-generic_handle_domain_irq
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cat-122 [000] d.h2. 2978.203685: serial8250_interrupt <-__handle_irq_event_percpu
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cat-122 [000] d.h3. 2978.203746: serial8250_default_handle_irq <-serial8250_interrupt
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cat-122 [000] d.h3. 2978.203807: serial8250_handle_irq <-serial8250_default_handle_irq
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cat-122 [000] d.h3. 2978.203990: plic_irq_eoi <-handle_fasteoi_irq
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cat-122 [000] d..2. 2978.204783: plic_irq_disable <-irq_disable
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cat-122 [000] d..2. 2978.204844: plic_toggle.constprop.0 <-plic_irq_disable
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cat-122 [000] d..2. 2978.205088: plic_irq_enable <-irq_enable
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cat-122 [000] d..2. 2978.205149: plic_toggle.constprop.0 <-plic_irq_enable
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cat-122 [000] d..2. 2978.205271: serial8250_do_set_mctrl <-serial8250_do_startup
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cat-122 [000] ...1. 2978.205393: serial8250_set_termios <-uart_change_line_settings
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cat-122 [000] ...1. 2978.206796: serial8250_do_set_termios <-serial8250_set_termios
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cat-122 [000] .n.1. 2978.206918: serial8250_get_divisor <-serial8250_do_set_termios
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cat-122 [000] dn.2. 2978.207040: serial8250_do_set_divisor <-serial8250_do_set_termios
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cat-122 [000] dn.2. 2978.207101: serial8250_do_set_mctrl <-serial8250_do_set_termios
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cat-122 [000] dn.2. 2978.207345: serial8250_set_mctrl <-uart_update_mctrl
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cat-122 [000] dn.2. 2978.207406: serial8250_do_set_mctrl <-serial8250_set_mctrl
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/sys/kernel/tracing # plictool
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Source Pend Prio C0(7) C1(0)
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1 yes 1 - firing
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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33 - 0 - masked
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/sys/kernel/tracing # plictool -C 1
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0
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Another test tracing the UART serial too.
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It would be nice to see where those calls are coming from.
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Let's collect the commands I need to use here:
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mount -t tracefs nodev /sys/kernel/tracing/
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cd /sys/kernel/tracing/
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echo 'plic_*' >> set_ftrace_filter
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echo 'serial8250_*' >> set_ftrace_filter
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cat current_tracer
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Here is a trace with the stack trace printed:
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~ # plictool
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Source Pend Prio C0(7) C1(0)
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1 - 1 - -
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2 - 1 - -
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3 - 1 - -
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4 yes 1 - -
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~ #
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[...]
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/sys/kernel/tracing # cat /dev/ttyS1 &
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cat-122 [000] ..... 591.693894: serial8250_pm <-uart_port_startup
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cat-122 [000] ..... 591.694077: <stack trace>
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=> ftrace_call
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=> uart_port_activate
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=> tty_port_open
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=> uart_open
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=> tty_open
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=> chrdev_open
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=> do_dentry_open
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=> vfs_open
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=> path_openat
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=> do_filp_open
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=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] ..... 591.694138: serial8250_set_sleep <-serial8250_pm
|
||||
cat-122 [000] ..... 591.694260: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] ..... 591.694504: serial8250_startup <-uart_port_startup
|
||||
cat-122 [000] ..... 591.694687: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] ..... 591.694748: serial8250_do_startup <-serial8250_startup
|
||||
cat-122 [000] ..... 591.694870: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d..1. 591.695236: plic_irq_enable <-irq_enable
|
||||
cat-122 [000] d..1. 591.695358: <stack trace>
|
||||
=> ftrace_call
|
||||
=> irq_startup
|
||||
=> __setup_irq
|
||||
=> request_threaded_irq
|
||||
=> univ8250_setup_irq
|
||||
=> serial8250_do_startup
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d..1. 591.695480: plic_toggle.constprop.0 <-plic_irq_enable
|
||||
cat-122 [000] d..1. 591.695602: <stack trace>
|
||||
=> ftrace_call
|
||||
=> irq_enable
|
||||
=> irq_startup
|
||||
=> __setup_irq
|
||||
=> request_threaded_irq
|
||||
=> univ8250_setup_irq
|
||||
=> serial8250_do_startup
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d..1. 591.696456: plic_irq_disable <-irq_disable
|
||||
cat-122 [000] d..1. 591.696578: <stack trace>
|
||||
=> ftrace_call
|
||||
=> __disable_irq_nosync
|
||||
=> disable_irq_nosync
|
||||
=> serial8250_do_startup
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d..1. 591.696639: plic_toggle.constprop.0 <-plic_irq_disable
|
||||
cat-122 [000] d..1. 591.696822: <stack trace>
|
||||
=> ftrace_call
|
||||
=> irq_disable
|
||||
=> __disable_irq_nosync
|
||||
=> disable_irq_nosync
|
||||
=> serial8250_do_startup
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d..1. 591.697005: plic_irq_enable <-irq_enable
|
||||
cat-122 [000] d..1. 591.697188: <stack trace>
|
||||
=> ftrace_call
|
||||
=> irq_startup
|
||||
=> __enable_irq
|
||||
=> enable_irq
|
||||
=> serial8250_do_startup
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d..1. 591.697249: plic_toggle.constprop.0 <-plic_irq_enable
|
||||
cat-122 [000] d..1. 591.697432: <stack trace>
|
||||
=> ftrace_call
|
||||
=> irq_enable
|
||||
=> irq_startup
|
||||
=> __enable_irq
|
||||
=> enable_irq
|
||||
=> serial8250_do_startup
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] d.h1. 591.697554: plic_handle_irq <-generic_handle_domain_irq
|
||||
cat-122 [000] d.h1. 591.697676: <stack trace>
|
||||
=> ftrace_call
|
||||
=> riscv_intc_irq
|
||||
=> handle_riscv_irq
|
||||
=> call_on_irq_stack
|
||||
=> 0x1c003b9260
|
||||
cat-122 [000] d.h1. 591.697798: serial8250_interrupt <-__handle_irq_event_percpu
|
||||
cat-122 [000] d.h1. 591.697920: <stack trace>
|
||||
=> ftrace_call
|
||||
=> handle_irq_event
|
||||
=> handle_fasteoi_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> plic_handle_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> riscv_intc_irq
|
||||
=> handle_riscv_irq
|
||||
=> call_on_irq_stack
|
||||
=> 0x1c001dc940
|
||||
cat-122 [000] d.h2. 591.697981: serial8250_default_handle_irq <-serial8250_interrupt
|
||||
cat-122 [000] d.h2. 591.698103: <stack trace>
|
||||
=> ftrace_call
|
||||
=> __handle_irq_event_percpu
|
||||
=> handle_irq_event
|
||||
=> handle_fasteoi_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> plic_handle_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> riscv_intc_irq
|
||||
=> handle_riscv_irq
|
||||
=> call_on_irq_stack
|
||||
=> 0x1c001dc940
|
||||
cat-122 [000] d.h2. 591.698164: serial8250_handle_irq <-serial8250_default_handle_irq
|
||||
cat-122 [000] d.h2. 591.698286: <stack trace>
|
||||
=> ftrace_call
|
||||
=> serial8250_interrupt
|
||||
=> __handle_irq_event_percpu
|
||||
=> handle_irq_event
|
||||
=> handle_fasteoi_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> plic_handle_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> riscv_intc_irq
|
||||
=> handle_riscv_irq
|
||||
=> call_on_irq_stack
|
||||
=> 0x1c00595ba0
|
||||
cat-122 [000] d.h2. 591.698469: plic_irq_eoi <-handle_fasteoi_irq
|
||||
cat-122 [000] d.h2. 591.698530: <stack trace>
|
||||
=> ftrace_call
|
||||
=> generic_handle_domain_irq
|
||||
=> plic_handle_irq
|
||||
=> generic_handle_domain_irq
|
||||
=> riscv_intc_irq
|
||||
=> handle_riscv_irq
|
||||
=> call_on_irq_stack
|
||||
=> 0x1c00595ba0
|
||||
cat-122 [000] d..1. 591.698713: serial8250_do_set_mctrl <-serial8250_do_startup
|
||||
cat-122 [000] d..1. 591.698835: <stack trace>
|
||||
=> ftrace_call
|
||||
=> serial8250_startup
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] .n... 591.700177: serial8250_set_termios <-uart_change_line_settings
|
||||
cat-122 [000] .n... 591.700299: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] .n... 591.700421: serial8250_do_set_termios <-serial8250_set_termios
|
||||
cat-122 [000] .n... 591.700543: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_change_line_settings
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] .n... 591.700604: serial8250_get_divisor <-serial8250_do_set_termios
|
||||
cat-122 [000] .n... 591.700787: <stack trace>
|
||||
=> ftrace_call
|
||||
=> serial8250_set_termios
|
||||
=> uart_change_line_settings
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] dn.1. 591.700909: serial8250_do_set_divisor <-serial8250_do_set_termios
|
||||
cat-122 [000] dn.1. 591.701031: <stack trace>
|
||||
=> ftrace_call
|
||||
=> serial8250_set_termios
|
||||
=> uart_change_line_settings
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] dn.1. 591.701092: serial8250_do_set_mctrl <-serial8250_do_set_termios
|
||||
cat-122 [000] dn.1. 591.701214: <stack trace>
|
||||
=> ftrace_call
|
||||
=> serial8250_set_termios
|
||||
=> uart_change_line_settings
|
||||
=> uart_port_startup
|
||||
=> uart_port_activate
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] dn.1. 591.701458: serial8250_set_mctrl <-uart_update_mctrl
|
||||
cat-122 [000] dn.1. 591.701580: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_dtr_rts
|
||||
=> tty_port_block_til_ready
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
cat-122 [000] dn.1. 591.701702: serial8250_do_set_mctrl <-serial8250_set_mctrl
|
||||
cat-122 [000] dn.1. 591.701885: <stack trace>
|
||||
=> ftrace_call
|
||||
=> uart_update_mctrl
|
||||
=> uart_dtr_rts
|
||||
=> tty_port_block_til_ready
|
||||
=> tty_port_open
|
||||
=> uart_open
|
||||
=> tty_open
|
||||
=> chrdev_open
|
||||
=> do_dentry_open
|
||||
=> vfs_open
|
||||
=> path_openat
|
||||
=> do_filp_open
|
||||
=> do_sys_openat2
|
||||
=> __riscv_sys_openat
|
||||
=> do_trap_ecall_u
|
||||
=> ret_from_exception
|
||||
|
||||
/sys/kernel/tracing # plictool
|
||||
Source Pend Prio C0(7) C1(0)
|
||||
1 yes 1 - firing
|
||||
2 - 1 - -
|
||||
3 - 1 - -
|
||||
4 yes 1 - -
|
||||
33 - 0 - masked
|
||||
|
||||
/sys/kernel/tracing # plictool -C 1
|
||||
0
|
||||
|
||||
## 2024-10-04
|
||||
|
||||
To trace which accesses are done to the PLIC, I can use the mmiotracer, which
|
||||
will hopefully record how we configure the PLIC and lead to a reproducer.
|
||||
|
||||
CONFIG_MMIOTRACE=y
|
||||
|
||||
Loading…
Reference in New Issue
Block a user