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Subject[PATCH 3/9] iommu/vt-d: Use global PASID for SVM usage
Date
This patch switches PASID management for SVM from per iommu
idr to the global idr.

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: Kevin Tian <kevin.tian@intel.com>
---
drivers/iommu/intel-svm.c | 22 +++++++++++-----------
include/linux/intel-iommu.h | 1 -
2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 983af0c..24d0ea1 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -26,6 +26,8 @@
#include <linux/interrupt.h>
#include <asm/page.h>

+#include "intel-pasid.h"
+
#define PASID_ENTRY_P BIT_ULL(0)
#define PASID_ENTRY_FLPM_5LP BIT_ULL(9)
#define PASID_ENTRY_SRE BIT_ULL(11)
@@ -85,8 +87,6 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
iommu->name);
}

- idr_init(&iommu->pasid_idr);
-
return 0;
}

@@ -102,7 +102,7 @@ int intel_svm_free_pasid_tables(struct intel_iommu *iommu)
free_pages((unsigned long)iommu->pasid_state_table, order);
iommu->pasid_state_table = NULL;
}
- idr_destroy(&iommu->pasid_idr);
+
return 0;
}

@@ -392,9 +392,9 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
pasid_max = iommu->pasid_max;

/* Do not use PASID 0 in caching mode (virtualised IOMMU) */
- ret = idr_alloc(&iommu->pasid_idr, svm,
- !!cap_caching_mode(iommu->cap),
- pasid_max - 1, GFP_KERNEL);
+ ret = intel_pasid_alloc_id(svm,
+ !!cap_caching_mode(iommu->cap),
+ pasid_max - 1, GFP_KERNEL);
if (ret < 0) {
kfree(svm);
kfree(sdev);
@@ -410,7 +410,7 @@ 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) {
- idr_remove(&svm->iommu->pasid_idr, svm->pasid);
+ intel_pasid_free_id(svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -460,7 +460,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
if (!iommu || !iommu->pasid_table)
goto out;

- svm = idr_find(&iommu->pasid_idr, pasid);
+ svm = intel_pasid_lookup_id(pasid);
if (!svm)
goto out;

@@ -485,7 +485,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
svm->iommu->pasid_table[svm->pasid].val = 0;
wmb();

- idr_remove(&svm->iommu->pasid_idr, svm->pasid);
+ intel_pasid_free_id(svm->pasid);
if (svm->mm)
mmu_notifier_unregister(&svm->notifier, svm->mm);

@@ -520,7 +520,7 @@ int intel_svm_is_pasid_valid(struct device *dev, int pasid)
if (!iommu || !iommu->pasid_table)
goto out;

- svm = idr_find(&iommu->pasid_idr, pasid);
+ svm = intel_pasid_lookup_id(pasid);
if (!svm)
goto out;

@@ -618,7 +618,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)

if (!svm || svm->pasid != req->pasid) {
rcu_read_lock();
- svm = idr_find(&iommu->pasid_idr, req->pasid);
+ svm = intel_pasid_lookup_id(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 795717e..6b5ef6c 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -418,7 +418,6 @@ struct intel_iommu {
struct pasid_state_entry *pasid_state_table;
struct page_req_dsc *prq;
unsigned char prq_name[16]; /* Name for PRQ interrupt */
- struct idr pasid_idr;
u32 pasid_max;
#endif
struct q_inval *qi; /* Queued invalidation info */
--
2.7.4
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