linux-kernel - Re: [PATCH v3 5/7] nvme-pci: add device coredump infrastructure

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Date:   Tue, 14 May 2019 00:01:07 +0900
From:   Akinobu Mita <akinobu.mita@...il.com>
To:     Keith Busch <kbusch@...nel.org>
Cc:     "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Johannes Berg <johannes@...solutions.net>,
        "Busch, Keith" <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        "Heitke, Kenneth" <kenneth.heitke@...el.com>
Subject: Re: [PATCH v3 5/7] nvme-pci: add device coredump infrastructure

2019年5月13日(月) 22:55 Keith Busch <kbusch@...nel.org>:
>
> On Sun, May 12, 2019 at 08:54:15AM -0700, Akinobu Mita wrote:
> > +static void nvme_coredump_logs(struct nvme_dev *dev)
> > +{
> > +     struct dev_coredumpm_bulk_data *bulk_data;
> > +
> > +     if (!dev->dumps)
> > +             return;
> > +
> > +     bulk_data = nvme_coredump_alloc(dev, 1);
> > +     if (!bulk_data)
> > +             return;
> > +
> > +     if (nvme_coredump_telemetry_log(bulk_data, &dev->ctrl))
> > +             dev->num_dumps--;
> > +}
>
> You'll need this function to return the same 'int' value from
> nvme_coredump_telemetry_log. A negative value here means that the
> device didn't produce a response, and that's important to check from
> the reset work since you'll need to abort the reset if that happens.

OK.  Make sense.