linux-kernel - Re: [PATCH v3 08/11] nvme-pci: Use PCI p2pmem subsystem to manage the CMB

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Date:   Mon, 12 Mar 2018 21:55:27 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v3 08/11] nvme-pci: Use PCI p2pmem subsystem to manage the
 CMB

On 3/12/2018 3:35 PM, Logan Gunthorpe wrote:
> -	if (nvmeq->sq_cmds_io)

I think you should keep the code as it is for the case where
(!nvmeq->sq_cmds_is_io && nvmeq->sq_cmds_io)

You are changing the behavior for NVMe drives with CMB buffers.
You can change the if statement here with the statement above.

> -		memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd));
> -	else
> -		memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
> +	memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
>  


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.