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Re: [Qemu-arm] [PATCH v6 07/16] gdbstub: add multiprocess support to (f|
From: |
Luc Michel |
Subject: |
Re: [Qemu-arm] [PATCH v6 07/16] gdbstub: add multiprocess support to (f|s)ThreadInfo and ThreadExtraInfo |
Date: |
Mon, 19 Nov 2018 11:12:45 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |
On 11/16/18 11:04 AM, Edgar E. Iglesias wrote:
> On Thu, Nov 15, 2018 at 10:41:58AM +0100, Luc Michel wrote:
>> Change the thread info related packets handling to support multiprocess
>> extension.
>>
>> Add the CPUs class name in the extra info to help differentiate
>> them in multiprocess mode.
>>
>> Signed-off-by: Luc Michel <address@hidden>
>> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
>> ---
>> gdbstub.c | 35 +++++++++++++++++++++++++----------
>> 1 file changed, 25 insertions(+), 10 deletions(-)
>>
>> diff --git a/gdbstub.c b/gdbstub.c
>> index d19b0137e8..292dee8914 100644
>> --- a/gdbstub.c
>> +++ b/gdbstub.c
>> @@ -1260,11 +1260,10 @@ out:
>> static int gdb_handle_packet(GDBState *s, const char *line_buf)
>> {
>> CPUState *cpu;
>> CPUClass *cc;
>> const char *p;
>> - uint32_t thread;
>> uint32_t pid, tid;
>> int ch, reg_size, type, res;
>> uint8_t mem_buf[MAX_PACKET_LENGTH];
>> char buf[sizeof(mem_buf) + 1 /* trailing NUL */];
>> char thread_id[16];
>> @@ -1556,30 +1555,46 @@ static int gdb_handle_packet(GDBState *s, const char
>> *line_buf)
>> snprintf(buf, sizeof(buf), "QC%s",
>> gdb_fmt_thread_id(s, cpu, thread_id,
>> sizeof(thread_id)));
>> put_packet(s, buf);
>> break;
>> } else if (strcmp(p,"fThreadInfo") == 0) {
>> - s->query_cpu = first_cpu;
>> + s->query_cpu = gdb_first_cpu(s);
>> goto report_cpuinfo;
>> } else if (strcmp(p,"sThreadInfo") == 0) {
>> report_cpuinfo:
>> if (s->query_cpu) {
>> - snprintf(buf, sizeof(buf), "m%x",
>> cpu_gdb_index(s->query_cpu));
>> + snprintf(buf, sizeof(buf), "m%s",
>> + gdb_fmt_thread_id(s, s->query_cpu,
>> + thread_id, sizeof(thread_id)));
>> put_packet(s, buf);
>> - s->query_cpu = CPU_NEXT(s->query_cpu);
>> + s->query_cpu = gdb_next_cpu(s, s->query_cpu);
>> } else
>> put_packet(s, "l");
>> break;
>> } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) {
>> - thread = strtoull(p+16, (char **)&p, 16);
>> - cpu = find_cpu(thread);
>> + if (read_thread_id(p + 16, &p, &pid, &tid) ==
>> GDB_READ_THREAD_ERR) {
>> + put_packet(s, "E22");
>> + break;
>> + }
>> + cpu = gdb_get_cpu(s, pid, tid);
>> if (cpu != NULL) {
>> cpu_synchronize_state(cpu);
>> - /* memtohex() doubles the required space */
>> - len = snprintf((char *)mem_buf, sizeof(buf) / 2,
>> - "CPU#%d [%s]", cpu->cpu_index,
>> - cpu->halted ? "halted " : "running");
>> +
>> + if (s->multiprocess && (s->process_num > 1)) {
>> + /* Print the CPU model in multiprocess mode */
>> + ObjectClass *oc = object_get_class(OBJECT(cpu));
>> + const char *cpu_model = object_class_get_name(oc);
>> + len = snprintf((char *)mem_buf, sizeof(buf) / 2,
>> + "CPU#%d %s [%s]", cpu->cpu_index,
>> + cpu_model,
>> + cpu->halted ? "halted " : "running");
>
>
>
> I wonder if we could also print a friendly name here deducted from QOM?
> In some of our use-cases we have an array of MicroBlazes that all live
> in different HW subsystems and are named differently (e.g CSU, PMU, PMC,
> PSM etc).
>
> Instead of just seeing a list of MicroBlaze cores it may be more useful
> to see the actual core name of some sort, e.g:
>
> Instead of:
> CPU#0 MicroBlaze [running]
> CPU#1 MicroBlaze [running]
> CPU#2 MicroBlaze [running]
> CPU#3 MicroBlaze [running]
>
> Perhaps something like:
> CPU#0 MicroBlaze PMU [running]
> CPU#1 MicroBlaze PMC-PPU0 [running]
> CPU#2 MicroBlaze PMC-PPU1 [running]
> CPU#3 MicroBlaze PSM [running]
>
> Any thoughts on that?
I wanted to avoid the ThreadExtraInfo packet to become too much cluttered.
Here are some tests adding the component part of the CPU canonical name:
(gdb) info threads
Id Target Id Frame
1.1 Thread 1.1 (CPU#0 cortex-a53-arm-cpu apu-cpu[0] [running])
0x0000000000000000 in ?? ()
1.2 Thread 1.2 (CPU#1 cortex-a53-arm-cpu apu-cpu[1] [halted ])
0x0000000000000000 in ?? ()
1.3 Thread 1.3 (CPU#2 cortex-a53-arm-cpu apu-cpu[2] [halted ])
0x0000000000000000 in ?? ()
1.4 Thread 1.4 (CPU#3 cortex-a53-arm-cpu apu-cpu[3] [halted ])
0x0000000000000000 in ?? ()
* 2.1 Thread 2.5 (CPU#4 cortex-r5f-arm-cpu rpu-cpu[0] [halted ])
0xffff0000 in ?? ()
2.2 Thread 2.6 (CPU#5 cortex-r5f-arm-cpu rpu-cpu[1] [halted ])
0xffff0000 in ?? ()
The model name takes quite some room. The interesting info are `arm` and
`cortex-xxx`, but AFAIK there is no way of extracting that for a CPU
generically.
In this case, having the component part of the canonical name is ok
because self-explanatory. However we could encounter cases where the
parent name would be necessary to discriminate the CPUs, something like:
cluster[0]/cpu[0]
/cpu[1]
cluster[1]/cpu[0]
/cpu[1]
...
The "safest" way would be to have the whole path:
(gdb) info threads
Id Target Id Frame
1.1 Thread 1.1 (CPU#0 cortex-a53-arm-cpu
/machine/soc/apu-cluster/apu-cpu[0] [running]) 0x0000000000000000 in ?? ()
1.2 Thread 1.2 (CPU#1 cortex-a53-arm-cpu
/machine/soc/apu-cluster/apu-cpu[1] [halted ]) 0x0000000000000000 in ?? ()
1.3 Thread 1.3 (CPU#2 cortex-a53-arm-cpu
/machine/soc/apu-cluster/apu-cpu[2] [halted ]) 0x0000000000000000 in ?? ()
1.4 Thread 1.4 (CPU#3 cortex-a53-arm-cpu
/machine/soc/apu-cluster/apu-cpu[3] [halted ]) 0x0000000000000000 in ?? ()
* 2.1 Thread 2.5 (CPU#4 cortex-r5f-arm-cpu
/machine/soc/rpu-cluster/rpu-cpu[0] [halted ]) 0xffff0000 in ?? ()
2.2 Thread 2.6 (CPU#5 cortex-r5f-arm-cpu
/machine/soc/rpu-cluster/rpu-cpu[1] [halted ]) 0xffff0000 in ?? ()
But that becomes really cluttered... We could also remove the CPU model
completely.
What are your thoughts?
Thanks,
Luc
>
> Thanks,
> Edgar
>
>> + } else {
>> + /* memtohex() doubles the required space */
>> + len = snprintf((char *)mem_buf, sizeof(buf) / 2,
>> + "CPU#%d [%s]", cpu->cpu_index,
>> + cpu->halted ? "halted " : "running");
>> + }
>> trace_gdbstub_op_extra_info((char *)mem_buf);
>> memtohex(buf, mem_buf, len);
>> put_packet(s, buf);
>> }
>> break;
>> --
>> 2.19.1
>>