linux-kernel - Re: [PATCH v3] block: sed-opal: kmalloc the cmd/resp buffers

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Date:   Tue, 08 Nov 2022 10:35:57 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Sagi Grimberg <sagi@...mberg.me>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Scott Bauer <scott.bauer@...el.com>,
        Jonathan Derrick <jonathan.derrick@...ux.dev>,
        Keith Busch <kbusch@...nel.org>,
        Rafael Antognolli <Rafael.Antognolli@...el.com>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>
Cc:     linux-block@...r.kernel.org,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        linux-nvme@...ts.infradead.org,
        Serge Semin <fancer.lancer@...il.com>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] block: sed-opal: kmalloc the cmd/resp buffers

On Mon, 7 Nov 2022 23:39:44 +0300, Serge Semin wrote:
> In accordance with [1] the DMA-able memory buffers must be
> cacheline-aligned otherwise the cache writing-back and invalidation
> performed during the mapping may cause the adjacent data being lost. It's
> specifically required for the DMA-noncoherent platforms [2]. Seeing the
> opal_dev.{cmd,resp} buffers are implicitly used for DMAs in the NVME and
> SCSI/SD drivers in framework of the nvme_sec_submit() and sd_sec_submit()
> methods respectively they must be cacheline-aligned to prevent the denoted
> problem. One of the option to guarantee that is to kmalloc the buffers
> [2]. Let's explicitly allocate them then instead of embedding into the
> opal_dev structure instance.
> 
> [...]

Applied, thanks!

[1/1] block: sed-opal: kmalloc the cmd/resp buffers
      (no commit info)

Best regards,
-- 
Jens Axboe