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

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Date:   Mon, 13 May 2019 16:46:01 +0900
From:   Minwoo Im <minwoo.im@...sung.com>
To:     "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Minwoo Im <minwoo.im@...sung.com>
CC:     Jens Axboe <axboe@...com>, Sagi Grimberg <sagi@...mberg.me>,
        Kenneth Heitke <kenneth.heitke@...el.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        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 v3 5/7] nvme-pci: add device coredump infrastructure

> +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;
> +
> +	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?