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Subject[RFC PATCH 5/5] iommu/vt-d: Use global pasid allocator
Date
This uses global pasid allocator in the Intel iommu driver.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 20 +++++++++++++++-----
drivers/iommu/intel-pasid.c | 36 ------------------------------------
drivers/iommu/intel-pasid.h | 3 ---
drivers/iommu/intel-svm.c | 24 +++++++++++++-----------
include/linux/intel-iommu.h | 3 +++
5 files changed, 31 insertions(+), 55 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 8dbd0c601dab..e15b81afcbbc 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1698,7 +1698,11 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
if (ecap_prs(iommu->ecap))
intel_svm_finish_prq(iommu);
}
+
+ iommu_pasid_exit(iommu->svm_pasid);
#endif
+
+ iommu_pasid_exit(iommu->aux_pasid);
}

static struct dmar_domain *alloc_domain(int flags)
@@ -5050,7 +5054,7 @@ static void auxiliary_unlink_device(struct dmar_domain *domain,
domain->auxd_refcnt--;

if (!domain->auxd_refcnt && domain->default_pasid > 0)
- intel_pasid_free_id(domain->default_pasid);
+ iommu_pasid_free(info->iommu->aux_pasid, domain->default_pasid);
}

static int domain_add_dev_auxd(struct dmar_domain *domain,
@@ -5067,9 +5071,10 @@ static int domain_add_dev_auxd(struct dmar_domain *domain,

spin_lock_irqsave(&device_domain_lock, flags);
if (domain->default_pasid <= 0) {
- domain->default_pasid = intel_pasid_alloc_id(domain, PASID_MIN,
- pci_max_pasids(to_pci_dev(dev)), GFP_ATOMIC);
- if (domain->default_pasid < 0) {
+ ret = iommu_pasid_alloc(iommu->aux_pasid, PASID_MIN,
+ pci_max_pasids(to_pci_dev(dev)),
+ domain, &domain->default_pasid);
+ if (ret) {
pr_err("Can't allocate default pasid\n");
ret = -ENODEV;
goto pasid_failed;
@@ -5099,7 +5104,7 @@ static int domain_add_dev_auxd(struct dmar_domain *domain,
attach_failed:
spin_unlock(&iommu->lock);
if (!domain->auxd_refcnt && domain->default_pasid > 0)
- intel_pasid_free_id(domain->default_pasid);
+ iommu_pasid_free(iommu->aux_pasid, domain->default_pasid);
pasid_failed:
spin_unlock_irqrestore(&device_domain_lock, flags);

@@ -5525,6 +5530,7 @@ static int intel_iommu_enable_auxd(struct device *dev)
{
struct device_domain_info *info;
struct dmar_domain *domain;
+ struct intel_iommu *iommu;
unsigned long flags;

if (!scalable_mode_support())
@@ -5539,6 +5545,10 @@ static int intel_iommu_enable_auxd(struct device *dev)
info->auxd_enabled = 1;
spin_unlock_irqrestore(&device_domain_lock, flags);

+ iommu = info->iommu;
+ if (!iommu->aux_pasid)
+ iommu->aux_pasid = iommu_pasid_init(&pci_bus_type);
+
return 0;
}

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index fb42f0c2493e..68eaef3bd4fd 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -26,7 +26,6 @@
*/
static DEFINE_SPINLOCK(pasid_lock);
u32 intel_pasid_max_id = PASID_MAX;
-static DEFINE_IDR(pasid_idr);

int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int *pasid)
{
@@ -98,41 +97,6 @@ void vcmd_free_pasid(struct intel_iommu *iommu, unsigned int pasid)
}
}

-int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp)
-{
- int ret, min, max;
-
- min = max_t(int, start, PASID_MIN);
- max = min_t(int, end, intel_pasid_max_id);
-
- WARN_ON(in_interrupt());
- idr_preload(gfp);
- spin_lock(&pasid_lock);
- ret = idr_alloc(&pasid_idr, ptr, min, max, GFP_ATOMIC);
- spin_unlock(&pasid_lock);
- idr_preload_end();
-
- return ret;
-}
-
-void intel_pasid_free_id(int pasid)
-{
- spin_lock(&pasid_lock);
- idr_remove(&pasid_idr, pasid);
- spin_unlock(&pasid_lock);
-}
-
-void *intel_pasid_lookup_id(int pasid)
-{
- void *p;
-
- spin_lock(&pasid_lock);
- p = idr_find(&pasid_idr, pasid);
- spin_unlock(&pasid_lock);
-
- return p;
-}
-
/*
* Per device pasid table management:
*/
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index c80787d02e2d..029f82ce9f4a 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -60,9 +60,6 @@ struct pasid_table {
};

extern u32 intel_pasid_max_id;
-int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
-void intel_pasid_free_id(int pasid);
-void *intel_pasid_lookup_id(int pasid);
int intel_pasid_alloc_table(struct device *dev);
void intel_pasid_free_table(struct device *dev);
struct pasid_table *intel_pasid_get_table(struct device *dev);
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 27cf1963207d..bb57a024eae7 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -261,6 +261,9 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
BUG_ON(!mm);
}

+ if (!iommu->svm_pasid)
+ iommu->svm_pasid = iommu_pasid_init(&pci_bus_type);
+
mutex_lock(&pasid_mutex);
if (pasid && !(flags & SVM_FLAG_PRIVATE_PASID)) {
struct intel_svm *t;
@@ -325,15 +328,14 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
pasid_max = intel_pasid_max_id;

/* Do not use PASID 0 in caching mode (virtualised IOMMU) */
- ret = intel_pasid_alloc_id(svm,
- !!cap_caching_mode(iommu->cap),
- pasid_max - 1, GFP_KERNEL);
- if (ret < 0) {
+ ret = iommu_pasid_alloc(iommu->svm_pasid,
+ !!cap_caching_mode(iommu->cap),
+ pasid_max - 1, svm, &svm->pasid);
+ if (ret) {
kfree(svm);
kfree(sdev);
goto out;
}
- svm->pasid = ret;
svm->notifier.ops = &intel_mmuops;
svm->mm = mm;
svm->flags = flags;
@@ -343,7 +345,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (mm) {
ret = mmu_notifier_register(&svm->notifier, mm);
if (ret) {
- intel_pasid_free_id(svm->pasid);
+ iommu_pasid_free(iommu->svm_pasid, svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -356,7 +358,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (ret) {
if (mm)
mmu_notifier_unregister(&svm->notifier, mm);
- intel_pasid_free_id(svm->pasid);
+ iommu_pasid_free(iommu->svm_pasid, svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -389,7 +391,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
if (!iommu)
goto out;

- svm = intel_pasid_lookup_id(pasid);
+ svm = iommu_pasid_find(iommu->svm_pasid, pasid);
if (!svm)
goto out;

@@ -411,7 +413,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
kfree_rcu(sdev, rcu);

if (list_empty(&svm->devs)) {
- intel_pasid_free_id(svm->pasid);
+ iommu_pasid_free(iommu->svm_pasid, svm->pasid);
if (svm->mm)
mmu_notifier_unregister(&svm->notifier, svm->mm);

@@ -446,7 +448,7 @@ int intel_svm_is_pasid_valid(struct device *dev, int pasid)
if (!iommu)
goto out;

- svm = intel_pasid_lookup_id(pasid);
+ svm = iommu_pasid_find(iommu->svm_pasid, pasid);
if (!svm)
goto out;

@@ -545,7 +547,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)

if (!svm || svm->pasid != req->pasid) {
rcu_read_lock();
- svm = intel_pasid_lookup_id(req->pasid);
+ svm = iommu_pasid_find(iommu->svm_pasid, req->pasid);
/* It *can't* go away, because the driver is not permitted
* to unbind the mm while any page faults are outstanding.
* So we only need RCU to protect the internal idr code. */
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 4605eef3686c..d79f99388293 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -552,6 +552,7 @@ struct intel_iommu {
#ifdef CONFIG_INTEL_IOMMU_SVM
struct page_req_dsc *prq;
unsigned char prq_name[16]; /* Name for PRQ interrupt */
+ struct iommu_pasid *svm_pasid; /* SVM PASID consumer */
#endif
struct q_inval *qi; /* Queued invalidation info */
u32 *iommu_state; /* Store iommu states between suspend and resume.*/
@@ -564,6 +565,8 @@ struct intel_iommu {
struct iommu_device iommu; /* IOMMU core code handle */
int node;
u32 flags; /* Software defined flags */
+
+ struct iommu_pasid *aux_pasid; /* Aux-domain pasid consumer */
};

/* PCI domain-device relationship */
--
2.17.1
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