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Date: Thu, 10 Nov 2016 11:05:29 +0000
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Robin Murphy <robin.murphy@....com>
Cc: iommu@...ts.linux-foundation.org,
Will Deacon <will.deacon@....com>,
Hanjun Guo <hanjun.guo@...aro.org>,
Joerg Roedel <joro@...tes.org>,
Marc Zyngier <marc.zyngier@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Tomasz Nowicki <tn@...ihalf.com>, Jon Masters <jcm@...hat.com>,
Eric Auger <eric.auger@...hat.com>,
Sinan Kaya <okaya@...eaurora.org>,
Nate Watterson <nwatters@...eaurora.org>,
Prem Mallappa <prem.mallappa@...adcom.com>,
Dennis Chen <dennis.chen@....com>, linux-acpi@...r.kernel.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 04/16] drivers: iommu: make of_iommu_set/get_ops() DT
agnostic
On Wed, Nov 09, 2016 at 02:40:08PM +0000, Robin Murphy wrote:
[...]
> > +void fwnode_iommu_set_ops(struct fwnode_handle *fwnode,
> > + const struct iommu_ops *ops)
> > +{
> > + struct iommu_fwentry *iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
> > +
> > + if (WARN_ON(!iommu))
> > + return;
> > +
> > + if (is_of_node(fwnode))
>
> Nit: this check is actually redundant, since to_of_node() already does
> the right thing and of_node_get() is NULL-safe - iommu_fwspec_init()
> already works that way. On the other hand, though, it is perhaps more
> intuitive to see it explicitly, and since to_of_node() is inline it
> ought to result in the same object code (I've not checked, though).
I can easily fold this change in the final code and I think we
should keep this consistent so I am happy to change my code and
make the is_of_node() check implicit.
> Either way:
>
> Reviewed-by: Robin Murphy <robin.murphy@....com>
Thank you !
Lorenzo
> > + of_node_get(to_of_node(fwnode));
> > +
> > + INIT_LIST_HEAD(&iommu->list);
> > + iommu->fwnode = fwnode;
> > + iommu->ops = ops;
> > + spin_lock(&iommu_fwentry_lock);
> > + list_add_tail(&iommu->list, &iommu_fwentry_list);
> > + spin_unlock(&iommu_fwentry_lock);
> > +}
> > +
> > +const struct iommu_ops *fwnode_iommu_get_ops(struct fwnode_handle *fwnode)
> > +{
> > + struct iommu_fwentry *node;
> > + const struct iommu_ops *ops = NULL;
> > +
> > + spin_lock(&iommu_fwentry_lock);
> > + list_for_each_entry(node, &iommu_fwentry_list, list)
> > + if (node->fwnode == fwnode) {
> > + ops = node->ops;
> > + break;
> > + }
> > + spin_unlock(&iommu_fwentry_lock);
> > + return ops;
> > +}
> > +
> > int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
> > const struct iommu_ops *ops)
> > {
> > diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> > index 5b82862..0f57ddc 100644
> > --- a/drivers/iommu/of_iommu.c
> > +++ b/drivers/iommu/of_iommu.c
> > @@ -96,45 +96,6 @@ int of_get_dma_window(struct device_node *dn, const char *prefix, int index,
> > }
> > EXPORT_SYMBOL_GPL(of_get_dma_window);
> >
> > -struct of_iommu_node {
> > - struct list_head list;
> > - struct device_node *np;
> > - const struct iommu_ops *ops;
> > -};
> > -static LIST_HEAD(of_iommu_list);
> > -static DEFINE_SPINLOCK(of_iommu_lock);
> > -
> > -void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops)
> > -{
> > - struct of_iommu_node *iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
> > -
> > - if (WARN_ON(!iommu))
> > - return;
> > -
> > - of_node_get(np);
> > - INIT_LIST_HEAD(&iommu->list);
> > - iommu->np = np;
> > - iommu->ops = ops;
> > - spin_lock(&of_iommu_lock);
> > - list_add_tail(&iommu->list, &of_iommu_list);
> > - spin_unlock(&of_iommu_lock);
> > -}
> > -
> > -const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
> > -{
> > - struct of_iommu_node *node;
> > - const struct iommu_ops *ops = NULL;
> > -
> > - spin_lock(&of_iommu_lock);
> > - list_for_each_entry(node, &of_iommu_list, list)
> > - if (node->np == np) {
> > - ops = node->ops;
> > - break;
> > - }
> > - spin_unlock(&of_iommu_lock);
> > - return ops;
> > -}
> > -
> > static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
> > {
> > struct of_phandle_args *iommu_spec = data;
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> > index 436dc21..15d5478 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -351,6 +351,9 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
> > const struct iommu_ops *ops);
> > void iommu_fwspec_free(struct device *dev);
> > int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
> > +void fwnode_iommu_set_ops(struct fwnode_handle *fwnode,
> > + const struct iommu_ops *ops);
> > +const struct iommu_ops *fwnode_iommu_get_ops(struct fwnode_handle *fwnode);
> >
> > #else /* CONFIG_IOMMU_API */
> >
> > @@ -580,6 +583,17 @@ static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
> > return -ENODEV;
> > }
> >
> > +static inline void fwnode_iommu_set_ops(struct fwnode_handle *fwnode,
> > + const struct iommu_ops *ops)
> > +{
> > +}
> > +
> > +static inline
> > +const struct iommu_ops *fwnode_iommu_get_ops(struct fwnode_handle *fwnode)
> > +{
> > + return NULL;
> > +}
> > +
> > #endif /* CONFIG_IOMMU_API */
> >
> > #endif /* __LINUX_IOMMU_H */
> > diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
> > index e80b9c7..7681007 100644
> > --- a/include/linux/of_iommu.h
> > +++ b/include/linux/of_iommu.h
> > @@ -31,8 +31,16 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
> >
> > #endif /* CONFIG_OF_IOMMU */
> >
> > -void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops);
> > -const struct iommu_ops *of_iommu_get_ops(struct device_node *np);
> > +static inline void of_iommu_set_ops(struct device_node *np,
> > + const struct iommu_ops *ops)
> > +{
> > + fwnode_iommu_set_ops(&np->fwnode, ops);
> > +}
> > +
> > +static inline const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
> > +{
> > + return fwnode_iommu_get_ops(&np->fwnode);
> > +}
> >
> > extern struct of_device_id __iommu_of_table;
> >
> >
>
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