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iommu/vt-d: Add for_each_device_domain() helper 

This adds a helper named for_each_device_domain() to iterate
over the elements in device_domain_list and invoke a callback
against each element. This allows to search the device_domain
list in other source files.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2018-07-14 15:46:58 +08:00 committed by Joerg Roedel
parent 9ddbfb4213
commit 85319dcc89
2 changed files with 23 additions and 0 deletions
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21
drivers/iommu/intel-iommu.c
View File

@ -448,6 +448,27 @@ EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
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. This helper should only be used
* in the context where the device_domain_lock has already been holden.
*/
int for_each_device_domain(int (*fn)(struct device_domain_info *info,
void *data), void *data)
{
int ret = 0;
struct device_domain_info *info;
assert_spin_locked(&device_domain_lock);
list_for_each_entry(info, &device_domain_list, global) {
ret = fn(info, data);
if (ret)
return ret;
}
return 0;
}
const struct iommu_ops intel_iommu_ops;
static bool translation_pre_enabled(struct intel_iommu *iommu)

2
include/linux/intel-iommu.h
View File

@ -520,6 +520,8 @@ struct dmar_domain *get_valid_domain_for_dev(struct device *dev);
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);
#ifdef CONFIG_INTEL_IOMMU_SVM
extern int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu);