linux-kernel - Re: [RESEND][PATCH 07/10][SCSI]mpt2sas: Added Reply Descriptor Post Queue (RDPQ) Array support

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Date:   Wed, 26 Apr 2017 18:25:23 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Sreekanth Reddy <sreekanth.reddy@...adcom.com>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        "jejb\@kernel.org" <jejb@...nel.org>,
        "linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [RESEND][PATCH 07/10][SCSI]mpt2sas: Added Reply Descriptor Post Queue (RDPQ) Array support


Sreekanth,

> We need to satisfy this condition on those system where 32 bit dma
> consistent mask is not supported and it only supports 64 bit dma
> consistent mask. So on these system we can't set
> pci_set_consistent_dma_mask() to DMA_BIT_MASK(32).

Which systems are you talking about?

It seems a bit unrealistic to require all devices to support 64-bit DMA.

-- 
Martin K. Petersen	Oracle Linux Engineering