linux-kernel - Re: [PATCH v2 6/7] nvme-pci: add device coredump support

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Message-ID: <a4ec2c1a-1ff7-52fe-07bd-179613411536@intel.com>
Date:   Tue, 7 May 2019 14:31:41 -0600
From:   "Heitke, Kenneth" <kenneth.heitke@...el.com>
To:     Akinobu Mita <akinobu.mita@...il.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Jens Axboe <axboe@...com>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 6/7] nvme-pci: add device coredump support



On 5/7/2019 10:58 AM, Akinobu Mita wrote:
> +
> +static int nvme_get_telemetry_log_blocks(struct nvme_ctrl *ctrl, void *buf,
> +					 size_t bytes, loff_t offset)
> +{
> +	const size_t chunk_size = ctrl->max_hw_sectors * ctrl->page_size;

Just curious if chunk_size is correct since page size and block size can
be different.


> +	loff_t pos = 0;
> +
> +	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;
> +}