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Message-ID: <290a89f0-8318-6130-468c-6412add62cfb@arm.com>
Date: Wed, 9 Feb 2022 13:52:55 +0000
From: Robin Murphy <robin.murphy@....com>
To: Lu Baolu <baolu.lu@...ux.intel.com>,
Joerg Roedel <joro@...tes.org>,
Jason Gunthorpe <jgg@...dia.com>,
Christoph Hellwig <hch@...radead.org>,
Ben Skeggs <bskeggs@...hat.com>,
Kevin Tian <kevin.tian@...el.com>,
Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>
Cc: Alex Williamson <alex.williamson@...hat.com>,
Eric Auger <eric.auger@...hat.com>,
Liu Yi L <yi.l.liu@...el.com>,
Jacob jun Pan <jacob.jun.pan@...el.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/10] iommu: Remove unused argument in
is_attach_deferred
On 2022-02-08 01:25, Lu Baolu wrote:
> The is_attach_deferred iommu_ops callback is a device op. The domain
> argument is unnecessary and never used. Remove it to make code clean.
>
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
> include/linux/iommu.h | 2 +-
> drivers/iommu/amd/amd_iommu.h | 3 +--
> drivers/iommu/amd/iommu.c | 3 +--
> drivers/iommu/amd/iommu_v2.c | 2 +-
> drivers/iommu/intel/iommu.c | 3 +--
> drivers/iommu/iommu.c | 15 ++++++---------
> 6 files changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index eb2684f95018..47ca7eca5d7b 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -269,7 +269,7 @@ struct iommu_ops {
> void (*put_resv_regions)(struct device *dev, struct list_head *list);
>
> int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
> - bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
> + bool (*is_attach_deferred)(struct device *dev);
>
> /* Per device IOMMU features */
> bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
> diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
> index 416815a525d6..3b2f06b7aca6 100644
> --- a/drivers/iommu/amd/amd_iommu.h
> +++ b/drivers/iommu/amd/amd_iommu.h
> @@ -116,8 +116,7 @@ void amd_iommu_domain_clr_pt_root(struct protection_domain *domain)
>
>
> extern bool translation_pre_enabled(struct amd_iommu *iommu);
> -extern bool amd_iommu_is_attach_deferred(struct iommu_domain *domain,
> - struct device *dev);
> +extern bool amd_iommu_is_attach_deferred(struct device *dev);
> extern int __init add_special_device(u8 type, u8 id, u16 *devid,
> bool cmd_line);
>
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index 461f1844ed1f..37f2fbb4b129 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -2215,8 +2215,7 @@ static void amd_iommu_get_resv_regions(struct device *dev,
> list_add_tail(®ion->list, head);
> }
>
> -bool amd_iommu_is_attach_deferred(struct iommu_domain *domain,
> - struct device *dev)
> +bool amd_iommu_is_attach_deferred(struct device *dev)
> {
> struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);
>
> diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
> index 58da08cc3d01..7c94ec05d289 100644
> --- a/drivers/iommu/amd/iommu_v2.c
> +++ b/drivers/iommu/amd/iommu_v2.c
> @@ -537,7 +537,7 @@ static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
> ret = NOTIFY_DONE;
>
> /* In kdump kernel pci dev is not initialized yet -> send INVALID */
> - if (amd_iommu_is_attach_deferred(NULL, &pdev->dev)) {
> + if (amd_iommu_is_attach_deferred(&pdev->dev)) {
> amd_iommu_complete_ppr(pdev, iommu_fault->pasid,
> PPR_INVALID, tag);
> goto out;
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 2b5f4e57a8bb..80f1294be634 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -5052,8 +5052,7 @@ intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
> }
> }
>
> -static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain,
> - struct device *dev)
> +static bool intel_iommu_is_attach_deferred(struct device *dev)
> {
> return attach_deferred(dev);
Seems like there's no need to wrap this now?
Robin.
> }
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index de593a9cc09c..3dff30ddebdd 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -825,13 +825,12 @@ static int iommu_create_device_direct_mappings(struct iommu_group *group,
> return ret;
> }
>
> -static bool iommu_is_attach_deferred(struct iommu_domain *domain,
> - struct device *dev)
> +static bool iommu_is_attach_deferred(struct device *dev)
> {
> const struct iommu_ops *ops = dev_iommu_ops(dev);
>
> if (ops->is_attach_deferred)
> - return ops->is_attach_deferred(domain, dev);
> + return ops->is_attach_deferred(dev);
>
> return false;
> }
> @@ -888,7 +887,7 @@ int iommu_group_add_device(struct iommu_group *group, struct device *dev)
>
> mutex_lock(&group->mutex);
> list_add_tail(&device->list, &group->devices);
> - if (group->domain && !iommu_is_attach_deferred(group->domain, dev))
> + if (group->domain && !iommu_is_attach_deferred(dev))
> ret = __iommu_attach_device(group->domain, dev);
> mutex_unlock(&group->mutex);
> if (ret)
> @@ -1743,7 +1742,7 @@ static int iommu_group_do_dma_attach(struct device *dev, void *data)
> struct iommu_domain *domain = data;
> int ret = 0;
>
> - if (!iommu_is_attach_deferred(domain, dev))
> + if (!iommu_is_attach_deferred(dev))
> ret = __iommu_attach_device(domain, dev);
>
> return ret;
> @@ -2018,9 +2017,7 @@ EXPORT_SYMBOL_GPL(iommu_attach_device);
>
> int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain)
> {
> - const struct iommu_ops *ops = dev_iommu_ops(dev);
> -
> - if (ops->is_attach_deferred && ops->is_attach_deferred(domain, dev))
> + if (iommu_is_attach_deferred(dev))
> return __iommu_attach_device(domain, dev);
>
> return 0;
> @@ -2029,7 +2026,7 @@ int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain)
> static void __iommu_detach_device(struct iommu_domain *domain,
> struct device *dev)
> {
> - if (iommu_is_attach_deferred(domain, dev))
> + if (iommu_is_attach_deferred(dev))
> return;
>
> if (unlikely(domain->ops->detach_dev == NULL))
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