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Date: Wed, 1 Jun 2022 08:53:49 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>,
Joerg Roedel <joro@...tes.org>,
"Raj, Ashok" <ashok.raj@...el.com>,
Christoph Hellwig <hch@...radead.org>,
"Jason Gunthorpe" <jgg@...dia.com>
CC: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
"Liu, Yi L" <yi.l.liu@...el.com>,
"Pan, Jacob jun" <jacob.jun.pan@...el.com>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 02/12] iommu/vt-d: Remove for_each_device_domain()
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Friday, May 27, 2022 2:30 PM
>
> The per-device device_domain_info data could be retrieved from the
> device itself. There's no need to search a global list.
>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> ---
> drivers/iommu/intel/iommu.h | 2 --
> drivers/iommu/intel/iommu.c | 25 -------------------------
> drivers/iommu/intel/pasid.c | 37 +++++++++++--------------------------
> 3 files changed, 11 insertions(+), 53 deletions(-)
>
> diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
> index 8a6d64d726c0..2f4a5b9509c0 100644
> --- a/drivers/iommu/intel/iommu.h
> +++ b/drivers/iommu/intel/iommu.h
> @@ -727,8 +727,6 @@ extern int dmar_ir_support(void);
> void *alloc_pgtable_page(int node);
> void free_pgtable_page(void *vaddr);
> struct intel_iommu *domain_get_iommu(struct dmar_domain *domain);
> -int for_each_device_domain(int (*fn)(struct device_domain_info *info,
> - void *data), void *data);
> void iommu_flush_write_buffer(struct intel_iommu *iommu);
> int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device
> *dev);
> struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8
> *devfn);
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index cacae8bdaa65..6549b09d7f32 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -316,31 +316,6 @@ static int iommu_skip_te_disable;
>
> static DEFINE_SPINLOCK(device_domain_lock);
> static LIST_HEAD(device_domain_list);
> -
> -/*
> - * Iterate over elements in device_domain_list and call the specified
> - * callback @fn against each element.
> - */
> -int for_each_device_domain(int (*fn)(struct device_domain_info *info,
> - void *data), void *data)
> -{
> - int ret = 0;
> - unsigned long flags;
> - struct device_domain_info *info;
> -
> - spin_lock_irqsave(&device_domain_lock, flags);
> - list_for_each_entry(info, &device_domain_list, global) {
> - ret = fn(info, data);
> - if (ret) {
> - spin_unlock_irqrestore(&device_domain_lock, flags);
> - return ret;
> - }
> - }
> - spin_unlock_irqrestore(&device_domain_lock, flags);
> -
> - return 0;
> -}
> -
> const struct iommu_ops intel_iommu_ops;
>
> static bool translation_pre_enabled(struct intel_iommu *iommu)
> diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
> index b2ac5869286f..0627d6465f25 100644
> --- a/drivers/iommu/intel/pasid.c
> +++ b/drivers/iommu/intel/pasid.c
> @@ -103,36 +103,20 @@ device_detach_pasid_table(struct
> device_domain_info *info,
> }
>
> struct pasid_table_opaque {
> - struct pasid_table **pasid_table;
> - int segment;
> - int bus;
> - int devfn;
> + struct pasid_table *pasid_table;
> };
>
> -static int search_pasid_table(struct device_domain_info *info, void *opaque)
> -{
> - struct pasid_table_opaque *data = opaque;
> -
> - if (info->iommu->segment == data->segment &&
> - info->bus == data->bus &&
> - info->devfn == data->devfn &&
> - info->pasid_table) {
> - *data->pasid_table = info->pasid_table;
> - return 1;
> - }
> -
> - return 0;
> -}
> -
> static int get_alias_pasid_table(struct pci_dev *pdev, u16 alias, void
> *opaque)
> {
> struct pasid_table_opaque *data = opaque;
> + struct device_domain_info *info;
>
> - data->segment = pci_domain_nr(pdev->bus);
> - data->bus = PCI_BUS_NUM(alias);
> - data->devfn = alias & 0xff;
> + info = dev_iommu_priv_get(&pdev->dev);
> + if (!info || !info->pasid_table)
> + return 0;
>
> - return for_each_device_domain(&search_pasid_table, data);
> + data->pasid_table = info->pasid_table;
> + return 1;
> }
>
> /*
> @@ -141,9 +125,9 @@ static int get_alias_pasid_table(struct pci_dev *pdev,
> u16 alias, void *opaque)
> */
> int intel_pasid_alloc_table(struct device *dev)
> {
> + struct pasid_table_opaque data = { NULL };
> struct device_domain_info *info;
> struct pasid_table *pasid_table;
> - struct pasid_table_opaque data;
> struct page *pages;
> u32 max_pasid = 0;
> int ret, order;
> @@ -155,11 +139,12 @@ int intel_pasid_alloc_table(struct device *dev)
> return -EINVAL;
>
> /* DMA alias device already has a pasid table, use it: */
> - data.pasid_table = &pasid_table;
> ret = pci_for_each_dma_alias(to_pci_dev(dev),
> &get_alias_pasid_table, &data);
> - if (ret)
> + if (ret) {
> + pasid_table = data.pasid_table;
> goto attach_out;
> + }
>
> pasid_table = kzalloc(sizeof(*pasid_table), GFP_KERNEL);
> if (!pasid_table)
> --
> 2.25.1
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