linux-kernel - Re: [PATCH v6 06/07] iommu/ipmmu-vmsa: ARM and ARM64 archdata access

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Date:   Fri, 11 Nov 2016 03:27:38 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Magnus Damm <magnus.damm@...il.com>,
        iommu@...ts.linux-foundation.org,
        laurent.pinchart+renesas@...asonboard.com, geert+renesas@...der.be,
        joro@...tes.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, horms+renesas@...ge.net.au,
        m.szyprowski@...sung.com
Subject: Re: [PATCH v6 06/07] iommu/ipmmu-vmsa: ARM and ARM64 archdata access

Hello,

On Friday 21 Oct 2016 18:32:54 Robin Murphy wrote:
> On 20/10/16 00:36, Magnus Damm wrote:
> > From: Magnus Damm <damm+renesas@...nsource.se>
> > 
> > Not all architectures have an iommu member in their archdata, so
> > use #ifdefs support build wit COMPILE_TEST on any architecture.
> 
> As an alternative to this we could now use iommu_fwspec in place of the
> custom ipmmu_vmsa_archdata - that's deliberately
> architecture-independent. I converted the Mediatek drivers[1] as an
> example to stand separately from the big SMMU rework, as those are the
> ones I'm most familiar with, but it looks like the IPMMU is a similarly
> perfect fit.
> 
> Of course, that could always come afterwards as a cleanup - I wouldn't
> consider it a blocker at this point - but it does look like it might
> simplify some of the code being moved around in this series if it were
> to be done beforehand.

I like the suggestion, it looks much cleaner. It would also allow implementing 
.of_xlate() in a cleaner fashion. I don't think it needs to block this series, 
but if Magnus ends up sending a v7 to address all the other small comments, it 
would be worth a shot.

> [1]:http://www.mail-archive.com/iommu@lists.linux-foundation.org/msg14577.ht
> ml
> > Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
> > Reviewed-by: Joerg Roedel <jroedel@...e.de>
> > ---
> > 
> >  Changes since V5:
> >  - None
> >  
> >  Changes since V4:
> >  - None
> >  
> >  Changes since V3:
> >  - New patch
> >  
> >  drivers/iommu/ipmmu-vmsa.c |   37 +++++++++++++++++++++++++++----------
> >  1 file changed, 27 insertions(+), 10 deletions(-)
> > 
> > --- 0012/drivers/iommu/ipmmu-vmsa.c
> > +++ work/drivers/iommu/ipmmu-vmsa.c	2016-09-20 21:59:21.690607110 +0900
> > @@ -70,6 +70,25 @@ static struct ipmmu_vmsa_domain *to_vmsa
> > 
> >  	return container_of(dom, struct ipmmu_vmsa_domain, io_domain);
> >  
> >  }
> > 
> > +#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
> > +static struct ipmmu_vmsa_archdata *to_archdata(struct device *dev)
> > +{
> > +	return dev->archdata.iommu;
> > +}
> > +static void set_archdata(struct device *dev, struct ipmmu_vmsa_archdata
> > *p) +{
> > +	dev->archdata.iommu = p;
> > +}
> > +#else
> > +static struct ipmmu_vmsa_archdata *to_archdata(struct device *dev)
> > +{
> > +	return NULL;
> > +}
> > +static void set_archdata(struct device *dev, struct ipmmu_vmsa_archdata
> > *p) +{
> > +}
> > +#endif
> > +
> > 
> >  #define TLB_LOOP_TIMEOUT		100	/* 100us */
> >  
> >  /*
> >  ------------------------------------------------------------------------
> >  -----> 
> > @@ -539,7 +558,7 @@ static void ipmmu_domain_free(struct iom
> > 
> >  static int ipmmu_attach_device(struct iommu_domain *io_domain,
> >  
> >  			       struct device *dev)
> >  
> >  {
> > 
> > -	struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
> > +	struct ipmmu_vmsa_archdata *archdata = to_archdata(dev);
> > 
> >  	struct ipmmu_vmsa_device *mmu = archdata->mmu;
> >  	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
> >  	unsigned long flags;
> > 
> > @@ -581,7 +600,7 @@ static int ipmmu_attach_device(struct io
> > 
> >  static void ipmmu_detach_device(struct iommu_domain *io_domain,
> >  
> >  				struct device *dev)
> >  
> >  {
> > 
> > -	struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
> > +	struct ipmmu_vmsa_archdata *archdata = to_archdata(dev);
> > 
> >  	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
> >  	unsigned int i;
> > 
> > @@ -701,7 +720,7 @@ static int ipmmu_init_platform_device(st
> > 
> >  	archdata->mmu = mmu;
> >  	archdata->utlbs = utlbs;
> >  	archdata->num_utlbs = num_utlbs;
> > 
> > -	dev->archdata.iommu = archdata;
> > +	set_archdata(dev, archdata);
> > 
> >  	return 0;
> >  
> >  error:
> > @@ -713,12 +732,11 @@ error:
> >  static int ipmmu_add_device(struct device *dev)
> >  {
> > 
> > -	struct ipmmu_vmsa_archdata *archdata;
> > 
> >  	struct ipmmu_vmsa_device *mmu = NULL;
> >  	struct iommu_group *group;
> >  	int ret;
> > 
> > -	if (dev->archdata.iommu) {
> > +	if (to_archdata(dev)) {
> > 
> >  		dev_warn(dev, "IOMMU driver already assigned to device %s\n",
> >  		
> >  			 dev_name(dev));
> >  		
> >  		return -EINVAL;
> > 
> > @@ -754,8 +772,7 @@ static int ipmmu_add_device(struct devic
> > 
> >  	 * - Make the mapping size configurable ? We currently use a 2GB 
mapping
> >  	 *   at a 1GB offset to ensure that NULL VAs will fault.
> >  	 */
> > 
> > -	archdata = dev->archdata.iommu;
> > -	mmu = archdata->mmu;
> > +	mmu = to_archdata(dev)->mmu;
> > 
> >  	if (!mmu->mapping) {
> >  	
> >  		struct dma_iommu_mapping *mapping;
> > 
> > @@ -783,7 +800,7 @@ error:
> >  	if (mmu)
> >  	
> >  		arm_iommu_release_mapping(mmu->mapping);
> > 
> > -	dev->archdata.iommu = NULL;
> > +	set_archdata(dev, NULL);
> > 
> >  	if (!IS_ERR_OR_NULL(group))
> >  	
> >  		iommu_group_remove_device(dev);
> > 
> > @@ -793,7 +810,7 @@ error:
> >  static void ipmmu_remove_device(struct device *dev)
> >  {
> > 
> > -	struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
> > +	struct ipmmu_vmsa_archdata *archdata = to_archdata(dev);
> > 
> >  	arm_iommu_detach_device(dev);
> >  	iommu_group_remove_device(dev);
> > 
> > @@ -801,7 +818,7 @@ static void ipmmu_remove_device(struct d
> > 
> >  	kfree(archdata->utlbs);
> >  	kfree(archdata);
> > 
> > -	dev->archdata.iommu = NULL;
> > +	set_archdata(dev, NULL);
> > 
> >  }
> >  
> >  static struct iommu_domain *ipmmu_domain_alloc(unsigned type)

-- 
Regards,

Laurent Pinchart