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From: Akinobu Mita <akinobu.mita@gmail.com>
To: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Cc: "minwoo.im@samsung.com" <minwoo.im@samsung.com>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Keith Busch <keith.busch@intel.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	Kenneth Heitke <kenneth.heitke@intel.com>,
	Jens Axboe <axboe@fb.com>, Minwoo Im <minwoo.im.dev@gmail.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 5/7] nvme-pci: add device coredump infrastructure
Date: Tue, 14 May 2019 23:06:21 +0900	[thread overview]
Message-ID: <CAC5umyh6hdcAnTCDK=7nX8VxFz7LiFY6ttUmcBPXfmXN4r88rw@mail.gmail.com> (raw)
In-Reply-To: <SN6PR04MB4527DFC75838C3236F5D05B2860F0@SN6PR04MB4527.namprd04.prod.outlook.com>

2019年5月14日(火) 0:23 Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>:
>
> On 05/13/2019 12:46 AM, Minwoo Im wrote:
> >> +static int nvme_get_telemetry_log_blocks(struct nvme_ctrl *ctrl, void *buf,
> >> +                                     size_t bytes, loff_t offset)
> >> +{
> >> +    loff_t pos = 0;
> >> +    u32 chunk_size;
> >> +
> >> +    if (check_mul_overflow(ctrl->max_hw_sectors, 512u, &chunk_size))
> >> +            chunk_size = UINT_MAX;
> >> +
> >> +    while (pos < bytes) {
> >> +            size_t size = min_t(size_t, bytes - pos, chunk_size);
> >> +            int ret;
> >> +
> >> +            ret = nvme_get_log(ctrl, NVME_NSID_ALL,
> >> NVME_LOG_TELEMETRY_CTRL,
> >> +                               0, buf + pos, size, offset + pos);
> >> +            if (ret)
> >> +                    return ret;
> >> +
> >> +            pos += size;
> >> +    }
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static int nvme_get_telemetry_log(struct nvme_ctrl *ctrl,
> >> +                              struct sg_table *table, size_t bytes)
> >> +{
> >> +    int n = sg_nents(table->sgl);
> >> +    struct scatterlist *sg;
> >> +    size_t offset = 0;
> >> +    int i;
> >> +
> A little comment would be nice if you are using sg operations.
> >> +    for_each_sg(table->sgl, sg, n, i) {
> >> +            struct page *page = sg_page(sg);
> >> +            size_t size = min_t(int, bytes - offset, sg->length);
> >> +            int ret;
> >> +
> >> +            ret = nvme_get_telemetry_log_blocks(ctrl,
> >> page_address(page),
> >> +                                                size, offset);
> >> +            if (ret)
> >> +                    return ret;
> >> +
> >> +            offset += size;
> >> +    }
> >> +
> >> +    return 0;
> >> +}
> >
> > Can we have those two in nvme-core module instead of being in pci module?
>
> Since they are based on the controller they should be moved next to
> nvme_get_log() in the ${KERN_DIR}/drivers/nvme/host/core.c.

OK.  But these functions will be changed to use bio_vec instead of sg in
the next version.

      reply	other threads:[~2019-05-14 14:06 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-12 15:54 [PATCH v3 0/7] nvme-pci: support device coredump Akinobu Mita
2019-05-12 15:54 ` [PATCH v3 1/7] devcoredump: use memory_read_from_buffer Akinobu Mita
2019-05-13 15:28   ` Chaitanya Kulkarni
2019-05-12 15:54 ` [PATCH v3 2/7] devcoredump: fix typo in comment Akinobu Mita
2019-05-13 15:24   ` Chaitanya Kulkarni
2019-05-12 15:54 ` [PATCH v3 3/7] devcoredump: allow to create several coredump files in one device Akinobu Mita
2019-05-12 15:54 ` [PATCH v3 4/7] nvme: add basic facility to get telemetry log page Akinobu Mita
2019-05-13 15:34   ` Chaitanya Kulkarni
2019-05-14 14:04     ` Akinobu Mita
2019-05-12 15:54 ` [PATCH v3 5/7] nvme-pci: add device coredump infrastructure Akinobu Mita
2019-05-13 13:50   ` Keith Busch
2019-05-13 15:01     ` Akinobu Mita
2019-05-13 14:02   ` Christoph Hellwig
2019-05-13 15:01     ` Akinobu Mita
2019-05-12 15:54 ` [PATCH v3 6/7] nvme-pci: trigger device coredump on command timeout Akinobu Mita
2019-05-13 13:52   ` Keith Busch
2019-05-12 15:54 ` [PATCH v3 7/7] nvme-pci: enable to trigger device coredump by hand Akinobu Mita
     [not found] ` <CGME20190512155533epcas4p110edff15ebf5b2efae32e43f0f10ab59@epcms2p5>
2019-05-13  7:41   ` [PATCH v3 6/7] nvme-pci: trigger device coredump on command timeout Minwoo Im
2019-05-13 14:59     ` Akinobu Mita
     [not found] ` <CGME20190512155540epcas4p14c15eb86b08dcd281e9a93a4fc190800@epcms2p1>
2019-05-13  7:46   ` [PATCH v3 5/7] nvme-pci: add device coredump infrastructure Minwoo Im
2019-05-13 15:23     ` Chaitanya Kulkarni
2019-05-14 14:06       ` Akinobu Mita [this message]

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