linux-kernel - Re: [PATCH v1 3/4] MIPS: bmips: Remove obsolete DMA mapping support

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Date:   Mon, 13 Dec 2021 09:28:02 +0100
From:   Christoph Hellwig <hch@....de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Jim Quinlan <jim2101024@...il.com>, linux-pci@...r.kernel.org,
        linux-mips@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kevin Cernekee <cernekee@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Christoph Hellwig <hch@....de>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 3/4] MIPS: bmips: Remove obsolete DMA mapping support

On Thu, Dec 09, 2021 at 01:31:39PM -0800, Florian Fainelli wrote:
> On 12/9/21 12:47 PM, Jim Quinlan wrote:
> > The code in 'arch/mips/bmips/dma.c' performed DMA mapping for inbound
> > regions.  This mapping was and is required for the Broadcom STB PCIe
> > controller HW.  This code is removed as the current 'struct device' has a
> > @dma_range_map field which performs the same functionality by processing
> > the "dma-ranges" DT property.
> > 
> > Subsequently, ARCH_HAS_PHYS_TO_DMA is now unset since the dma_to_phys()
> > and phys_to_dma() functions are removed.
> > 
> > Signed-off-by: Jim Quinlan <jim2101024@...il.com>
> 
> CC Christoph so he can do the happy dance, thanks!

No actual patch content in this mail so I can't comment about the
substance, but removing another ARCH_HAS_PHYS_TO_DMA instance is always
awesome.