linux-kernel - Re: [PATCH 04/12] habanalabs: add unsupported functions

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Date:   Tue, 28 Jun 2022 11:21:24 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/12] habanalabs: add unsupported functions

On Tue, Jun 28, 2022 at 9:34 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Mon, Jun 27, 2022 at 11:26:12PM +0300, Oded Gabbay wrote:
> > There are a number of new ASIC-specific functions that were added
> > for Gaudi2. To make the common code work, we need to define empty
> > implementations of those functions for Goya and Gaudi.
> >
> > Some functions will return error if called with Goya/Gaudi.
> >
> > Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
> > ---
> >  drivers/misc/habanalabs/gaudi/gaudi.c | 24 ++++++++++++++++++++++++
> >  drivers/misc/habanalabs/goya/goya.c   | 24 ++++++++++++++++++++++++
> >  2 files changed, 48 insertions(+)
> >
> > diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
> > index ae894335e9f8..f4581220ecd5 100644
> > --- a/drivers/misc/habanalabs/gaudi/gaudi.c
> > +++ b/drivers/misc/habanalabs/gaudi/gaudi.c
> > @@ -8588,6 +8588,11 @@ static void gaudi_ctx_fini(struct hl_ctx *ctx)
> >       gaudi_internal_cb_pool_fini(ctx->hdev, ctx);
> >  }
> >
> > +int gaudi_pre_schedule_cs(struct hl_cs *cs)
> > +{
> > +     return 0;
> > +}
> > +
> >  static u32 gaudi_get_queue_id_for_cq(struct hl_device *hdev, u32 cq_idx)
> >  {
> >       return gaudi_cq_assignment[cq_idx];
> > @@ -8959,6 +8964,14 @@ static void gaudi_enable_events_from_fw(struct hl_device *hdev)
> >               gaudi_irq_map_table[GAUDI_EVENT_INTS_REGISTER].cpu_id);
> >  }
> >
> > +int gaudi_ack_mmu_page_fault_or_access_error(struct hl_device *hdev,
> > +                                                     u64 mmu_cap_mask)
> > +{
> > +     dev_err(hdev->dev, "mmu_error function is not supported\n");
>
> Can userspace trigger this?  if so, make it debug, as you don't want to
> give userspace a way to spam the logs.

Only via a debugfs node which is exposed only to root user.
What is your recommendation in that case ?

Thanks,
Oded
>
> thanks,
>
> greg k-h