diff options
author | Jason Gunthorpe <jgg@nvidia.com> | 2024-02-26 20:07:21 +0300 |
---|---|---|
committer | Will Deacon <will@kernel.org> | 2024-02-29 18:12:22 +0300 |
commit | 1b50017d39f650d78a0066734d6fe05920a8c9e8 (patch) | |
tree | 913f84b3833889451c9a83297b20702d5b111a05 | |
parent | d550ddc5b789f258cb5ce3bfe74af6d5383589b5 (diff) | |
download | linux-1b50017d39f650d78a0066734d6fe05920a8c9e8.tar.xz |
iommu/arm-smmu-v3: Remove arm_smmu_master->domain
Introducing global statics which are of type struct iommu_domain, not
struct arm_smmu_domain makes it difficult to retain
arm_smmu_master->domain, as it can no longer point to an IDENTITY or
BLOCKED domain.
The only place that uses the value is arm_smmu_detach_dev(). Change things
to work like other drivers and call iommu_get_domain_for_dev() to obtain
the current domain.
The master->domain is subtly protecting the master->domain_head against
being unused as only PAGING domains will set master->domain and only
paging domains use the master->domain_head. To make it simple keep the
master->domain_head initialized so that the list_del() logic just does
nothing for attached non-PAGING domains.
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Moritz Fischer <moritzf@google.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/10-v6-96275f25c39d+2d4-smmuv3_newapi_p1_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>
-rw-r--r-- | drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 26 | ||||
-rw-r--r-- | drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 |
2 files changed, 10 insertions, 17 deletions
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 9d36ddecf2ad..19a7f0468149 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2507,19 +2507,20 @@ static void arm_smmu_disable_pasid(struct arm_smmu_master *master) static void arm_smmu_detach_dev(struct arm_smmu_master *master) { + struct iommu_domain *domain = iommu_get_domain_for_dev(master->dev); + struct arm_smmu_domain *smmu_domain; unsigned long flags; - struct arm_smmu_domain *smmu_domain = master->domain; - if (!smmu_domain) + if (!domain) return; + smmu_domain = to_smmu_domain(domain); arm_smmu_disable_ats(master, smmu_domain); spin_lock_irqsave(&smmu_domain->devices_lock, flags); - list_del(&master->domain_head); + list_del_init(&master->domain_head); spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); - master->domain = NULL; master->ats_enabled = false; } @@ -2573,8 +2574,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) arm_smmu_detach_dev(master); - master->domain = smmu_domain; - /* * The SMMU does not support enabling ATS with bypass. When the STE is * in bypass (STE.Config[2:0] == 0b100), ATS Translation Requests and @@ -2593,10 +2592,8 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) case ARM_SMMU_DOMAIN_S1: if (!master->cd_table.cdtab) { ret = arm_smmu_alloc_cd_tables(master); - if (ret) { - master->domain = NULL; + if (ret) goto out_list_del; - } } else { /* * arm_smmu_write_ctx_desc() relies on the entry being @@ -2604,17 +2601,13 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) */ ret = arm_smmu_write_ctx_desc(master, IOMMU_NO_PASID, NULL); - if (ret) { - master->domain = NULL; + if (ret) goto out_list_del; - } } ret = arm_smmu_write_ctx_desc(master, IOMMU_NO_PASID, &smmu_domain->cd); - if (ret) { - master->domain = NULL; + if (ret) goto out_list_del; - } arm_smmu_make_cdtable_ste(&target, master); arm_smmu_install_ste_for_dev(master, &target); @@ -2640,7 +2633,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) out_list_del: spin_lock_irqsave(&smmu_domain->devices_lock, flags); - list_del(&master->domain_head); + list_del_init(&master->domain_head); spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); out_unlock: @@ -2841,6 +2834,7 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) master->dev = dev; master->smmu = smmu; INIT_LIST_HEAD(&master->bonds); + INIT_LIST_HEAD(&master->domain_head); dev_iommu_priv_set(dev, master); ret = arm_smmu_insert_master(smmu, master); 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 eb669121f195..6b63ea7dae72 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -695,7 +695,6 @@ struct arm_smmu_stream { struct arm_smmu_master { struct arm_smmu_device *smmu; struct device *dev; - struct arm_smmu_domain *domain; struct list_head domain_head; struct arm_smmu_stream *streams; /* Locked by the iommu core using the group mutex */ |