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Date: Tue, 3 May 2022 19:14:56 +0100
From: Jean-Philippe Brucker <jean-philippe@...aro.org>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
Christoph Hellwig <hch@...radead.org>,
Kevin Tian <kevin.tian@...el.com>,
Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Jean-Philippe Brucker <jean-philippe@...aro.com>,
Dave Jiang <dave.jiang@...el.com>,
Vinod Koul <vkoul@...nel.org>,
Eric Auger <eric.auger@...hat.com>,
Liu Yi L <yi.l.liu@...el.com>,
Jacob jun Pan <jacob.jun.pan@...el.com>,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/12] iommu: Remove SVA related callbacks from iommu
ops
On Mon, May 02, 2022 at 09:48:39AM +0800, Lu Baolu wrote:
> These ops'es have been replaced with the dev_attach/detach_pasid domain
> ops'es. There's no need for them anymore. Remove them to avoid dead
> code.
>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> ---
> include/linux/intel-iommu.h | 4 --
> include/linux/iommu.h | 8 ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 17 -------
> drivers/iommu/iommu-sva-lib.h | 1 -
> .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 41 ----------------
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 --
> drivers/iommu/intel/iommu.c | 3 --
> drivers/iommu/intel/svm.c | 49 -------------------
> drivers/iommu/iommu-sva-lib.c | 4 +-
> 9 files changed, 2 insertions(+), 128 deletions(-)
>
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index 3b4ca16f53e2..5af24befc9f1 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -738,10 +738,6 @@ struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn);
> extern void intel_svm_check(struct intel_iommu *iommu);
> extern int intel_svm_enable_prq(struct intel_iommu *iommu);
> extern int intel_svm_finish_prq(struct intel_iommu *iommu);
> -struct iommu_sva *intel_svm_bind(struct device *dev, struct mm_struct *mm,
> - void *drvdata);
> -void intel_svm_unbind(struct iommu_sva *handle);
> -u32 intel_svm_get_pasid(struct iommu_sva *handle);
> int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
> struct iommu_page_response *msg);
> extern const struct iommu_domain_ops intel_svm_domain_ops;
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index c5a16b47cae8..19718939d9df 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -214,9 +214,6 @@ struct iommu_iotlb_gather {
> * @dev_has/enable/disable_feat: per device entries to check/enable/disable
> * iommu specific features.
> * @dev_feat_enabled: check enabled feature
> - * @sva_bind: Bind process address space to device
> - * @sva_unbind: Unbind process address space from device
> - * @sva_get_pasid: Get PASID associated to a SVA handle
> * @page_response: handle page request response
> * @def_domain_type: device default domain type, return value:
> * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
> @@ -250,11 +247,6 @@ struct iommu_ops {
> int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
> int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
>
> - struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
> - void *drvdata);
> - void (*sva_unbind)(struct iommu_sva *handle);
> - u32 (*sva_get_pasid)(struct iommu_sva *handle);
> -
> int (*page_response)(struct device *dev,
> struct iommu_fault_event *evt,
> struct iommu_page_response *msg);
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> index 7631c00fdcbd..2513309ec0db 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> @@ -754,10 +754,6 @@ bool arm_smmu_master_sva_enabled(struct arm_smmu_master *master);
> int arm_smmu_master_enable_sva(struct arm_smmu_master *master);
> int arm_smmu_master_disable_sva(struct arm_smmu_master *master);
> bool arm_smmu_master_iopf_supported(struct arm_smmu_master *master);
> -struct iommu_sva *arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm,
> - void *drvdata);
> -void arm_smmu_sva_unbind(struct iommu_sva *handle);
> -u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle);
> void arm_smmu_sva_notifier_synchronize(void);
> int arm_smmu_sva_attach_dev_pasid(struct iommu_domain *domain,
> struct device *dev, ioasid_t id);
> @@ -794,19 +790,6 @@ static inline bool arm_smmu_master_iopf_supported(struct arm_smmu_master *master
> return false;
> }
>
> -static inline struct iommu_sva *
> -arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm, void *drvdata)
> -{
> - return ERR_PTR(-ENODEV);
> -}
> -
> -static inline void arm_smmu_sva_unbind(struct iommu_sva *handle) {}
> -
> -static inline u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
> -{
> - return IOMMU_PASID_INVALID;
> -}
> -
> static inline void arm_smmu_sva_notifier_synchronize(void) {}
>
> static inline int arm_smmu_sva_attach_dev_pasid(struct iommu_domain *domain,
> diff --git a/drivers/iommu/iommu-sva-lib.h b/drivers/iommu/iommu-sva-lib.h
> index 9c5e108e2c8a..5776b4c80cc1 100644
> --- a/drivers/iommu/iommu-sva-lib.h
> +++ b/drivers/iommu/iommu-sva-lib.h
> @@ -8,7 +8,6 @@
> #include <linux/ioasid.h>
> #include <linux/mm_types.h>
>
> -int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t max);
> struct mm_struct *iommu_sva_find(ioasid_t pasid);
> struct mm_struct *iommu_sva_domain_mm(struct iommu_domain *domain);
>
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> index 3b843cd3ed67..0ace04b27d4b 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> @@ -335,11 +335,6 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
> if (!bond)
> return ERR_PTR(-ENOMEM);
>
> - /* Allocate a PASID for this mm if necessary */
> - ret = iommu_sva_alloc_pasid(mm, 1, (1U << master->ssid_bits) - 1);
> - if (ret)
> - goto err_free_bond;
> -
> bond->mm = mm;
> bond->sva.dev = dev;
> refcount_set(&bond->refs, 1);
> @@ -358,42 +353,6 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
> return ERR_PTR(ret);
> }
>
> -struct iommu_sva *
> -arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm, void *drvdata)
> -{
> - struct iommu_sva *handle;
> - struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
> - struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
> -
> - if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
> - return ERR_PTR(-EINVAL);
> -
> - mutex_lock(&sva_lock);
> - handle = __arm_smmu_sva_bind(dev, mm);
> - mutex_unlock(&sva_lock);
> - return handle;
> -}
> -
> -void arm_smmu_sva_unbind(struct iommu_sva *handle)
> -{
> - struct arm_smmu_bond *bond = sva_to_bond(handle);
> -
> - mutex_lock(&sva_lock);
> - if (refcount_dec_and_test(&bond->refs)) {
> - list_del(&bond->list);
> - arm_smmu_mmu_notifier_put(bond->smmu_mn);
> - kfree(bond);
> - }
> - mutex_unlock(&sva_lock);
> -}
> -
> -u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
> -{
> - struct arm_smmu_bond *bond = sva_to_bond(handle);
> -
> - return bond->mm->pasid;
> -}
> -
> bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
> {
> unsigned long reg, fld;
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index bd80de0bad98..543d3ef1c102 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2875,9 +2875,6 @@ static struct iommu_ops arm_smmu_ops = {
> .dev_feat_enabled = arm_smmu_dev_feature_enabled,
> .dev_enable_feat = arm_smmu_dev_enable_feature,
> .dev_disable_feat = arm_smmu_dev_disable_feature,
> - .sva_bind = arm_smmu_sva_bind,
> - .sva_unbind = arm_smmu_sva_unbind,
> - .sva_get_pasid = arm_smmu_sva_get_pasid,
> .page_response = arm_smmu_page_response,
> .pgsize_bitmap = -1UL, /* Restricted during device attach */
> .owner = THIS_MODULE,
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 5d1d3e325afa..46e2eb15197b 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4914,9 +4914,6 @@ const struct iommu_ops intel_iommu_ops = {
> .def_domain_type = device_def_domain_type,
> .pgsize_bitmap = SZ_4K,
> #ifdef CONFIG_INTEL_IOMMU_SVM
> - .sva_bind = intel_svm_bind,
> - .sva_unbind = intel_svm_unbind,
> - .sva_get_pasid = intel_svm_get_pasid,
> .page_response = intel_svm_page_response,
> #endif
> .default_domain_ops = &(const struct iommu_domain_ops) {
> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
> index ec684d883014..6084f960ba27 100644
> --- a/drivers/iommu/intel/svm.c
> +++ b/drivers/iommu/intel/svm.c
> @@ -313,14 +313,6 @@ static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
> return 0;
> }
>
> -static int intel_svm_alloc_pasid(struct device *dev, struct mm_struct *mm)
> -{
> - ioasid_t max_pasid = dev_is_pci(dev) ?
> - pci_max_pasids(to_pci_dev(dev)) : intel_pasid_max_id;
> -
> - return iommu_sva_alloc_pasid(mm, PASID_MIN, max_pasid - 1);
> -}
> -
> static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
> struct device *dev,
> struct mm_struct *mm)
> @@ -809,47 +801,6 @@ static irqreturn_t prq_event_thread(int irq, void *d)
> return IRQ_RETVAL(handled);
> }
>
> -struct iommu_sva *intel_svm_bind(struct device *dev, struct mm_struct *mm, void *drvdata)
> -{
> - struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
> - struct iommu_sva *sva;
> - int ret;
> -
> - mutex_lock(&pasid_mutex);
> - ret = intel_svm_alloc_pasid(dev, mm);
> - if (ret) {
> - mutex_unlock(&pasid_mutex);
> - return ERR_PTR(ret);
> - }
> -
> - sva = intel_svm_bind_mm(iommu, dev, mm);
> - mutex_unlock(&pasid_mutex);
> -
> - return sva;
> -}
> -
> -void intel_svm_unbind(struct iommu_sva *sva)
> -{
> - struct intel_svm_dev *sdev = to_intel_svm_dev(sva);
> -
> - mutex_lock(&pasid_mutex);
> - intel_svm_unbind_mm(sdev->dev, sdev->pasid);
> - mutex_unlock(&pasid_mutex);
> -}
> -
> -u32 intel_svm_get_pasid(struct iommu_sva *sva)
> -{
> - struct intel_svm_dev *sdev;
> - u32 pasid;
> -
> - mutex_lock(&pasid_mutex);
> - sdev = to_intel_svm_dev(sva);
> - pasid = sdev->pasid;
> - mutex_unlock(&pasid_mutex);
> -
> - return pasid;
> -}
> -
> int intel_svm_page_response(struct device *dev,
> struct iommu_fault_event *evt,
> struct iommu_page_response *msg)
> diff --git a/drivers/iommu/iommu-sva-lib.c b/drivers/iommu/iommu-sva-lib.c
> index 0524659a4c0c..992388106da0 100644
> --- a/drivers/iommu/iommu-sva-lib.c
> +++ b/drivers/iommu/iommu-sva-lib.c
> @@ -41,7 +41,8 @@ struct mm_struct *iommu_sva_domain_mm(struct iommu_domain *domain)
> *
> * Returns 0 on success and < 0 on error.
> */
> -int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t max)
> +static int iommu_sva_alloc_pasid(struct mm_struct *mm,
> + ioasid_t min, ioasid_t max)
> {
> int ret = 0;
> ioasid_t pasid;
> @@ -67,7 +68,6 @@ int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t max)
> mutex_unlock(&iommu_sva_lock);
> return ret;
> }
> -EXPORT_SYMBOL_GPL(iommu_sva_alloc_pasid);
>
> /* ioasid_find getter() requires a void * argument */
> static bool __mmget_not_zero(void *mm)
> --
> 2.25.1
>
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