linux-kernel - Re: [PATCH 2/2] dma: Add IOMMU static calls with clear default ops

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Message-ID: <20240711184505.GB1815706@unreal>
Date: Thu, 11 Jul 2024 21:45:05 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Easwar Hariharan <eahariha@...ux.microsoft.com>
Cc: Christoph Hellwig <hch@....de>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...dia.com>, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: Re: [PATCH 2/2] dma: Add IOMMU static calls with clear default ops

On Thu, Jul 11, 2024 at 11:17:28AM -0700, Easwar Hariharan wrote:
> On 7/11/2024 3:38 AM, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...dia.com>
> > 
> > Most of the IOMMU drivers are using the same DMA operations, which are
> > default ones implemented in drivers/iomem/dma-iomem.c. So it makes sense
> 
> s/iomem/iommu?

Thanks, will fix it.

> 
> > to properly set them as a default with direct call without need to
> > perform function pointer dereference.
> > 
> > During system initialization, the IOMMU driver can set its own DMA and
> > in such case, the default DMA operations will be overridden.
> > 
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> >  MAINTAINERS               |  1 +
> >  drivers/iommu/dma-iommu.c | 24 +++++++-------
> >  include/linux/iommu-dma.h | 50 +++++++++++++++++++++++++++++
> >  kernel/dma/iommu.h        | 67 +++++++++++++++++++++++++++++++++++++++
> >  kernel/dma/mapping.c      |  9 +++---
> >  5 files changed, 134 insertions(+), 17 deletions(-)
> >  create mode 100644 include/linux/iommu-dma.h
> >  create mode 100644 kernel/dma/iommu.h
> > 
> 
> <snip>