linux-kernel - Re: [PATCH 3/9] add frontend implementation for the IOMMU API

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Date:	Mon, 1 Dec 2008 19:16:00 +0100
From:	'Joerg Roedel' <joerg.roedel@....com>
To:	"Han, Weidong" <weidong.han@...el.com>
CC:	"'kvm@...r.kernel.org'" <kvm@...r.kernel.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'iommu@...ts.linux-foundation.org'" 
	<iommu@...ts.linux-foundation.org>,
	"'avi@...hat.com'" <avi@...hat.com>,
	"'mingo@...hat.com'" <mingo@...hat.com>,
	"'dwmw2@...radead.org'" <dwmw2@...radead.org>,
	"'amit.shah@...hat.com'" <amit.shah@...hat.com>
Subject: Re: [PATCH 3/9] add frontend implementation for the IOMMU API

On Fri, Nov 28, 2008 at 10:50:36AM +0800, Han, Weidong wrote:
> Joerg Roedel wrote:
> > +struct iommu_domain *iommu_domain_alloc(struct device *dev)
> > +{
> > +	struct iommu_domain *domain;
> > +	int ret;
> > +
> > +	domain = kmalloc(sizeof(*domain), GFP_KERNEL);
> > +	if (!domain)
> > +		return NULL;
> > +
> > +	ret = iommu_ops->domain_init(domain, dev);
> > +	if (ret)
> > +		goto out_free;
> > +
> > +	return domain;
> > +
> > +out_free:
> > +	kfree(domain);
> > +
> > +	return NULL;
> > +}
> > +EXPORT_SYMBOL_GPL(iommu_domain_alloc);
> 
> remove the parameter dev.

[x] Done.

> > +
> > +void iommu_domain_free(struct iommu_domain *domain)
> > +{
> > +	iommu_ops->domain_destroy(domain);
> > +	kfree(domain);
> > +}
> > +EXPORT_SYMBOL_GPL(iommu_domain_free);
> > +
> > +int iommu_attach_device(struct iommu_domain *domain, struct device
> > *dev) +{
> > +	return iommu_ops->attach_dev(domain, dev);
> > +}
> > +EXPORT_SYMBOL_GPL(iommu_attach_device);
> > +
> > +void iommu_detach_device(struct iommu_domain *domain, struct device
> > *dev) +{
> > +	iommu_ops->detach_dev(domain, dev);
> > +}
> > +EXPORT_SYMBOL_GPL(iommu_detach_device);
> > +
> > +int iommu_map_address(struct iommu_domain *domain,
> > +		      dma_addr_t iova, phys_addr_t paddr,
> > +		      size_t size, int prot)
> > +{
> > +	return iommu_ops->map(domain, iova, paddr, size, prot);
> > +}
> > +EXPORT_SYMBOL_GPL(iommu_map_address);
> 
> change to:
> int iommu_map_pages(struct iommu_domain *domain, unsigned long gfn,
> 		unsigned long pfn, unsigned long npages, int prot)
> {
> 	return iommu_ops->map(domain, gfn, pfn, npages, prot);
> }
> EXPORT_SYMBOL_GPL(iommu_map_pages);
> 
> int iommu_unmap_pages(struct iommu_domain *domain, unsigned long gfn, unsigned long npages)
> {
> 	return iommu_ops->map(domain, gfn, npages);
> }
> EXPORT_SYMBOL_GPL(iommu_unmap_pages);

Ok, I added the unmap function. But I think this API should work with
addresses instead of page numbers. This way the IO page size is
transparent for the user.

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