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Subject[PATCH v4 8/9] iommu/vt-d: Apply per pci device pasid table in SVA
Date
This patch applies the per pci device pasid table in the Shared
Virtual Address (SVA) implementation.

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>
---
drivers/iommu/intel-iommu.c | 29 +++++++++--------------------
drivers/iommu/intel-svm.c | 22 ++++++++++------------
2 files changed, 19 insertions(+), 32 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index baad27a..f8609b5 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5208,22 +5208,16 @@ static void intel_iommu_put_resv_regions(struct device *dev,

#ifdef CONFIG_INTEL_IOMMU_SVM
#define MAX_NR_PASID_BITS (20)
-static inline unsigned long intel_iommu_get_pts(struct intel_iommu *iommu)
+static inline unsigned long intel_iommu_get_pts(struct device *dev)
{
- /*
- * Convert ecap_pss to extend context entry pts encoding, also
- * respect the soft pasid_max value set by the iommu.
- * - number of PASID bits = ecap_pss + 1
- * - number of PASID table entries = 2^(pts + 5)
- * Therefore, pts = ecap_pss - 4
- * e.g. KBL ecap_pss = 0x13, PASID has 20 bits, pts = 15
- */
- if (ecap_pss(iommu->ecap) < 5)
+ int pts, max_pasid;
+
+ max_pasid = intel_pasid_get_dev_max_id(dev);
+ pts = find_first_bit((unsigned long *)&max_pasid, MAX_NR_PASID_BITS);
+ if (pts < 5)
return 0;

- /* pasid_max is encoded as actual number of entries not the bits */
- return find_first_bit((unsigned long *)&iommu->pasid_max,
- MAX_NR_PASID_BITS) - 5;
+ return pts - 5;
}

int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev)
@@ -5259,8 +5253,8 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sd
if (!(ctx_lo & CONTEXT_PASIDE)) {
if (iommu->pasid_state_table)
context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table);
- context[1].lo = (u64)virt_to_phys(iommu->pasid_table) |
- intel_iommu_get_pts(iommu);
+ context[1].lo = (u64)virt_to_phys(info->pasid_table->table) |
+ intel_iommu_get_pts(sdev->dev);

wmb();
/* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB are both
@@ -5327,11 +5321,6 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
return NULL;
}

- if (!iommu->pasid_table) {
- dev_err(dev, "PASID not enabled on IOMMU; cannot enable SVM\n");
- return NULL;
- }
-
return iommu;
}
#endif /* CONFIG_INTEL_IOMMU_SVM */
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 9b5dc72..a253cde 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -274,11 +274,9 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
* page) so that we end up taking a fault that the hardware really
* *has* to handle gracefully without affecting other processes.
*/
- svm->iommu->pasid_table[svm->pasid].val = 0;
- wmb();
-
rcu_read_lock();
list_for_each_entry_rcu(sdev, &svm->devs, list) {
+ intel_pasid_clear_entry(sdev->dev, svm->pasid);
intel_flush_pasid_dev(svm, sdev, svm->pasid);
intel_flush_svm_range_dev(svm, sdev, 0, -1, 0, !svm->mm);
}
@@ -299,6 +297,7 @@ static LIST_HEAD(global_svm_list);
int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ops *ops)
{
struct intel_iommu *iommu = intel_svm_device_to_iommu(dev);
+ struct pasid_entry *entry;
struct intel_svm_dev *sdev;
struct intel_svm *svm = NULL;
struct mm_struct *mm = NULL;
@@ -306,7 +305,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
int pasid_max;
int ret;

- if (!iommu || !iommu->pasid_table)
+ if (!iommu)
return -EINVAL;

if (dev_is_pci(dev)) {
@@ -384,8 +383,8 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
}
svm->iommu = iommu;

- if (pasid_max > iommu->pasid_max)
- pasid_max = iommu->pasid_max;
+ if (pasid_max > intel_pasid_max_id)
+ pasid_max = intel_pasid_max_id;

/* Do not use PASID 0 in caching mode (virtualised IOMMU) */
ret = intel_pasid_alloc_id(svm,
@@ -418,7 +417,8 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (cpu_feature_enabled(X86_FEATURE_LA57))
pasid_entry_val |= PASID_ENTRY_FLPM_5LP;

- iommu->pasid_table[svm->pasid].val = pasid_entry_val;
+ entry = intel_pasid_get_entry(dev, svm->pasid);
+ entry->val = pasid_entry_val;

wmb();

@@ -453,7 +453,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)

mutex_lock(&pasid_mutex);
iommu = intel_svm_device_to_iommu(dev);
- if (!iommu || !iommu->pasid_table)
+ if (!iommu)
goto out;

svm = intel_pasid_lookup_id(pasid);
@@ -476,11 +476,9 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
intel_flush_pasid_dev(svm, sdev, svm->pasid);
intel_flush_svm_range_dev(svm, sdev, 0, -1, 0, !svm->mm);
kfree_rcu(sdev, rcu);
+ intel_pasid_clear_entry(dev, svm->pasid);

if (list_empty(&svm->devs)) {
- svm->iommu->pasid_table[svm->pasid].val = 0;
- wmb();
-
intel_pasid_free_id(svm->pasid);
if (svm->mm)
mmu_notifier_unregister(&svm->notifier, svm->mm);
@@ -513,7 +511,7 @@ int intel_svm_is_pasid_valid(struct device *dev, int pasid)

mutex_lock(&pasid_mutex);
iommu = intel_svm_device_to_iommu(dev);
- if (!iommu || !iommu->pasid_table)
+ if (!iommu)
goto out;

svm = intel_pasid_lookup_id(pasid);
--
2.7.4
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