Re: [PATCH v2 9/9] mmc: sh_mmcif: Use sg_miter for PIO

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Hi Linus,

On Wed, Feb 21, 2024 at 12:01 AM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
> On Tue, Feb 20, 2024 at 10:03 PM Geert Uytterhoeven
> <geert@xxxxxxxxxxxxxx> wrote:
>
> >      sh_mobile_sdhi ee120000.mmc: mmc1 base at 0xee120000, max clock rate 12 MHz
> >      mmc2: new high speed MMC card at address 0001
> >      sh_mobile_sdhi ee100000.mmc: mmc0 base at 0xee100000, max clock rate 88 MHz
> >      mmcblk2: mmc2:0001 MMC08G 7.33 GiB
>
> Hey it reads some blocks...
>
> >      BUG: sleeping function called from invalid context at kernel/workqueue.c:3347
> >      in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 35, name: irq/151-ee20000
> (...)
> >       __might_resched from __flush_work+0x20c/0x2e4
> >       __flush_work from __cancel_work_timer+0x118/0x198
> >       __cancel_work_timer from sh_mmcif_irqt+0x38/0x8f8
> >       sh_mmcif_irqt from irq_thread_fn+0x1c/0x58
>
> Actually that is the thread so the message is a bit confusing, the irq thread
> isn't atomic.
>
> I wonder if it is caused by this:
>
> > > +     sg_miter_start(&host->sg_miter, data->sg, data->sg_len,
> > > +                    SG_MITER_ATOMIC | SG_MITER_TO_SG);
>
> ...because I don't need to ask for atomic miter here, since the poll
> functions are actually called in process context.
>
> I've sent a patch, can you test?
> https://lore.kernel.org/linux-mmc/20240220-fix-sh-mmcif-v1-1-b9d08a787c1f@xxxxxxxxxx/T/#u

While that patch fixes the BUG, it does not make the eMMC work fully.
It spews:

    sh_mmcif ee200000.mmc: Timeout waiting for 2 on CMD18

and no or limited data is read ("hd /dev/mmcblk..." blocks after no
or two lines of output).

I still need to revert 27b57277d9ba to restore proper operation.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds





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