[PATCH 3/9] iommu/vt-d: Use global PASID for SVM usage

[Lu Baolu]

This patch switches PASID management for SVM from per iommu
idr to the global idr.

Cc: Ashok Raj <ashok....@intel.com>
Cc: Jacob Pan <jacob.jun....@linux.intel.com>
Cc: Kevin Tian <kevin.t...@intel.com>
Cc: Liu Yi L <yi.l....@intel.com>
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.t...@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