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iommu/vt-d: Remove SVM_FLAG_PRIVATE_PASID 

The SVM_FLAG_PRIVATE_PASID has never been referenced in the tree, and
there's no plan to have anything to use it. So cleanup it.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210323010600.678627-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2021-03-23 09:05:58 +08:00 committed by Joerg Roedel
parent 2e1a44c1c4
commit 06905ea831
2 changed files with 22 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/iommu/intel/svm.c
View File

@ -465,9 +465,9 @@ intel_svm_bind_mm(struct device *dev, unsigned int flags,
struct mm_struct *mm, struct intel_svm_dev **sd)
{
struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
struct intel_svm *svm = NULL, *t;
struct device_domain_info *info;
struct intel_svm_dev *sdev;
struct intel_svm *svm = NULL;
unsigned long iflags;
int pasid_max;
int ret;
@ -493,30 +493,26 @@ intel_svm_bind_mm(struct device *dev, unsigned int flags,
}
}
if (!(flags & SVM_FLAG_PRIVATE_PASID)) {
struct intel_svm *t;
list_for_each_entry(t, &global_svm_list, list) {
if (t->mm != mm)
continue;
list_for_each_entry(t, &global_svm_list, list) {
if (t->mm != mm || (t->flags & SVM_FLAG_PRIVATE_PASID))
continue;
svm = t;
if (svm->pasid >= pasid_max) {
dev_warn(dev,
"Limited PASID width. Cannot use existing PASID %d\n",
svm->pasid);
ret = -ENOSPC;
goto out;
}
/* Find the matching device in svm list */
for_each_svm_dev(sdev, svm, dev) {
sdev->users++;
goto success;
}
break;
svm = t;
if (svm->pasid >= pasid_max) {
dev_warn(dev,
"Limited PASID width. Cannot use existing PASID %d\n",
svm->pasid);
ret = -ENOSPC;
goto out;
}
/* Find the matching device in svm list */
for_each_svm_dev(sdev, svm, dev) {
sdev->users++;
goto success;
}
break;
}
sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);

16
include/linux/intel-svm.h
View File

@ -14,16 +14,6 @@
#define SVM_REQ_EXEC (1<<1)
#define SVM_REQ_PRIV (1<<0)
/*
* The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is *not* the "main"
* PASID for the current process. Even if a PASID already exists, a new one
* will be allocated. And the PASID allocated with SVM_FLAG_PRIVATE_PASID
* will not be given to subsequent callers. This facility allows a driver to
* disambiguate between multiple device contexts which access the same MM,
* if there is no other way to do so. It should be used sparingly, if at all.
*/
#define SVM_FLAG_PRIVATE_PASID (1<<0)
/*
* The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
* for access to kernel addresses. No IOTLB flushes are automatically done
@ -35,18 +25,18 @@
* It is unlikely that we will ever hook into flush_tlb_kernel_range() to
* do such IOTLB flushes automatically.
*/
#define SVM_FLAG_SUPERVISOR_MODE (1<<1)
#define SVM_FLAG_SUPERVISOR_MODE BIT(0)
/*
* The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
* processes. Compared to the host bind, the primary differences are:
* 1. mm life cycle management
* 2. fault reporting
*/
#define SVM_FLAG_GUEST_MODE (1<<2)
#define SVM_FLAG_GUEST_MODE BIT(1)
/*
* The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
* which requires guest and host PASID translation at both directions.
*/
#define SVM_FLAG_GUEST_PASID (1<<3)
#define SVM_FLAG_GUEST_PASID BIT(2)
#endif /* __INTEL_SVM_H__ */