[PATCH 2/2] remoteproc: imx_dsp_rproc: Add support of coredump

[Shengjiu Wang]

On Wed, Jul 2, 2025 at 3:20 PM Shengjiu Wang <shengjiu.wang at gmail.com> wrote:
>
> On Tue, Jul 1, 2025 at 11:27 PM Mathieu Poirier
> <mathieu.poirier at linaro.org> wrote:
> >
> > On Tue, Jul 01, 2025 at 10:28:33AM +0800, Shengjiu Wang wrote:
> > > On Tue, Jul 1, 2025 at 1:05 AM Mathieu Poirier
> > > <mathieu.poirier at linaro.org> wrote:
> > > >
> > > > On Wed, Jun 18, 2025 at 02:26:44PM +0800, Shengjiu Wang wrote:
> > > > > Add call rproc_coredump_set_elf_info() to initialize the elf info for
> > > > > coredump, otherwise coredump will report an error "ELF class is not set".
> > > > >
> > > > > Remove the DSP IRAM and DRAM segment in coredump list, because after
> > > > > stop, DSP power is disabled, the IRAM and DRAM can't be accessed.
> > > > >
> > > > > Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
> > > > > ---
> > > > >  drivers/remoteproc/imx_dsp_rproc.c | 6 +++---
> > > > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > > > >
> > > > > diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> > > > > index 9b9cddb224b0..9e7efb77b6e5 100644
> > > > > --- a/drivers/remoteproc/imx_dsp_rproc.c
> > > > > +++ b/drivers/remoteproc/imx_dsp_rproc.c
> > > > > @@ -738,9 +738,7 @@ static int imx_dsp_rproc_add_carveout(struct imx_dsp_rproc *priv)
> > > > >               mem = rproc_mem_entry_init(dev, (void __force *)cpu_addr, (dma_addr_t)att->sa,
> > > > >                                          att->size, da, NULL, NULL, "dsp_mem");
> > > > >
> > > > > -             if (mem)
> > > > > -                     rproc_coredump_add_segment(rproc, da, att->size);
> > > > > -             else
> > > > > +             if (!mem)
> > > >
> > > > Flag rproc->recovery_disabled is never set to true, meaning that since this
> > > > driver was introduced, some kind of recovery was available.
> > >
> > > Actually since this driver was introduced, the recovery can't work.
> > > We didn't test the recovery function before. sorry for the mistake.
> >
> > Let me see if I get this right:
> >
> > (1) Almost 5 years ago you sent me a driver with code you did not test.
>
> Driver was tested but missed the recovery/coredump function.
>
> > (2) It took all this time to realize and fix the problem.
>
> I just realized that the recovery/coredump is one of the functions supported
> by remoteproc.
>
> > (3) I should trust that, this time, you have tested your code.
>
> recovery/coredump has been tested.

I am not sure if we must power off dsp in .stop() and power on dsp in .start().
because I see such comments in remoteproc_core.c
        /* power up the remote processor */
        ret = rproc->ops->start(rproc);

        /* power off the remote processor */
        ret = rproc->ops->stop(rproc);

So I moved pm_runtime_get_sync() to .start() and pm_runtime_put_sync()
to .stop()
in this patchset.

previously we called pm_runtime_get_sync() in .prepare(),
pm_runtime_put_sync() in
.unprepare().
If we can keep the power on/off in .prepare()/.unprepare.  maybe we
can refine the
.load function which is to move .reset to .load(),  then we can reduce
the code change
and not need to change the coredump scope.

Before I test this idea I'd like to have your opinion about this.
Thanks.

Best regards
Shengjiu Wang
>
> Best regards
> Shengjiu Wang
>
> >
> > Did I understand all that correctly?
> >
> > >
> > > >
> > > > I worry that your work will introduce regression for other users.  Daniel and
> > > > Iuliana, once again have to ask you to look at this patchset.
> > > >
> > > > Thanks,
> > > > Mathieu
> > > >
> > > > >                       return -ENOMEM;
> > > > >
> > > > >               rproc_add_carveout(rproc, mem);
> > > > > @@ -1203,6 +1201,8 @@ static int imx_dsp_rproc_probe(struct platform_device *pdev)
> > > > >               goto err_detach_domains;
> > > > >       }
> > > > >
> > > > > +     rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_XTENSA);
> > > > > +
> > > > >       pm_runtime_enable(dev);
> > > > >
> > > > >       return 0;
> > > > > --
> > > > > 2.34.1
> > > > >
> > > >