linux-kernel - Re: [PATCH v2] nvme: allow use of cmb on v1.4 controllers

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Message-ID: <YAE28i5Aq0U40fPB@apples.localdomain>
Date:   Fri, 15 Jan 2021 07:32:18 +0100
From:   Klaus Jensen <its@...elevant.dk>
To:     linux-nvme@...ts.infradead.org
Cc:     Sagi Grimberg <sagi@...mberg.me>,
        Klaus Jensen <k.jensen@...sung.com>,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...com>,
        Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] nvme: allow use of cmb on v1.4 controllers

On Jan 15 07:30, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@...sung.com>
> 
> Since NVMe v1.4 the Controller Memory Buffer must be explicitly enabled
> by the host.
> 

Sorry, messed up and missed adding the changes for v2.

v2:
  - Do not explicitly check the NVMe version, rely on the presence of
    the new register instead. (Christoph)
  - Use hi_lo_writeq. (Christoph, Keith)
  - Fix missing offset and use pci_bus_address(). (Keith)

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