[PATCH v2 11/12] iommu/vt-d: Shared virtual address in scalable mode
From: Lu Baolu
Date: Wed Aug 29 2018 - 21:37:06 EST
This patch enables the current SVA (Shared Virtual Address)
implementation to work in the scalable mode.
Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Liu Yi L <yi.l.liu@xxxxxxxxx>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
---
drivers/iommu/intel-iommu.c | 40 +-----------------------
drivers/iommu/intel-pasid.c | 2 +-
drivers/iommu/intel-pasid.h | 1 -
drivers/iommu/intel-svm.c | 57 +++++++++++------------------------
include/linux/dma_remapping.h | 9 +-----
5 files changed, 20 insertions(+), 89 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index d854b17033a4..e378a383d4f4 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5279,18 +5279,6 @@ static void intel_iommu_put_resv_regions(struct device *dev,
}
#ifdef CONFIG_INTEL_IOMMU_SVM
-static inline unsigned long intel_iommu_get_pts(struct device *dev)
-{
- 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;
-
- return pts - 5;
-}
-
int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev)
{
struct device_domain_info *info;
@@ -5318,37 +5306,11 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sd
ctx_lo = context[0].lo;
- sdev->did = domain->iommu_did[iommu->seq_id];
+ sdev->did = FLPT_DEFAULT_DID;
sdev->sid = PCI_DEVID(info->bus, info->devfn);
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(info->pasid_table->table) |
- intel_iommu_get_pts(sdev->dev);
-
- wmb();
- /* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB are both
- * extended to permit requests-with-PASID if the PASIDE bit
- * is set. which makes sense. For CONTEXT_TT_PASS_THROUGH,
- * however, the PASIDE bit is ignored and requests-with-PASID
- * are unconditionally blocked. Which makes less sense.
- * So convert from CONTEXT_TT_PASS_THROUGH to one of the new
- * "guest mode" translation types depending on whether ATS
- * is available or not. Annoyingly, we can't use the new
- * modes *unless* PASIDE is set. */
- if ((ctx_lo & CONTEXT_TT_MASK) == (CONTEXT_TT_PASS_THROUGH << 2)) {
- ctx_lo &= ~CONTEXT_TT_MASK;
- if (info->ats_supported)
- ctx_lo |= CONTEXT_TT_PT_PASID_DEV_IOTLB << 2;
- else
- ctx_lo |= CONTEXT_TT_PT_PASID << 2;
- }
ctx_lo |= CONTEXT_PASIDE;
- if (iommu->pasid_state_table)
- ctx_lo |= CONTEXT_DINVE;
- if (info->pri_supported)
- ctx_lo |= CONTEXT_PRS;
context[0].lo = ctx_lo;
wmb();
iommu->flush.flush_context(iommu, sdev->did, sdev->sid,
diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index c921426d7b64..a24a11bae03e 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -283,7 +283,7 @@ static inline void pasid_clear_entry(struct pasid_entry *pe)
WRITE_ONCE(pe->val[7], 0);
}
-void intel_pasid_clear_entry(struct device *dev, int pasid)
+static void intel_pasid_clear_entry(struct device *dev, int pasid)
{
struct pasid_entry *pe;
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index ee5ac3d2ac22..9f628db9db41 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -50,7 +50,6 @@ void intel_pasid_free_table(struct device *dev);
struct pasid_table *intel_pasid_get_table(struct device *dev);
int intel_pasid_get_dev_max_id(struct device *dev);
struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid);
-void intel_pasid_clear_entry(struct device *dev, int pasid);
int intel_pasid_setup_first_level(struct intel_iommu *iommu,
struct mm_struct *mm,
struct device *dev,
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index a06ed098e928..fa5a19d83795 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -29,10 +29,6 @@
#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)
-
static irqreturn_t prq_event_thread(int irq, void *d);
struct pasid_state_entry {
@@ -248,20 +244,6 @@ static void intel_invalidate_range(struct mmu_notifier *mn,
(end - start + PAGE_SIZE - 1) >> VTD_PAGE_SHIFT, 0, 0);
}
-
-static void intel_flush_pasid_dev(struct intel_svm *svm, struct intel_svm_dev *sdev, int pasid)
-{
- struct qi_desc desc;
-
- desc.qw0 = QI_PC_TYPE | QI_PC_DID(sdev->did) |
- QI_PC_PASID_SEL | QI_PC_PASID(pasid);
- desc.qw1 = 0;
- desc.qw2 = 0;
- desc.qw3 = 0;
-
- qi_submit_sync(&desc, svm->iommu);
-}
-
static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct intel_svm *svm = container_of(mn, struct intel_svm, notifier);
@@ -281,8 +263,8 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
*/
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_pasid_tear_down_first_level(svm->iommu, sdev->dev,
+ sdev->did, svm->pasid);
intel_flush_svm_range_dev(svm, sdev, 0, -1, 0, !svm->mm);
}
rcu_read_unlock();
@@ -302,11 +284,9 @@ 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;
- u64 pasid_entry_val;
int pasid_max;
int ret;
@@ -415,22 +395,18 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
kfree(sdev);
goto out;
}
- pasid_entry_val = (u64)__pa(mm->pgd) | PASID_ENTRY_P;
- } else
- pasid_entry_val = (u64)__pa(init_mm.pgd) |
- PASID_ENTRY_P | PASID_ENTRY_SRE;
- if (cpu_feature_enabled(X86_FEATURE_LA57))
- pasid_entry_val |= PASID_ENTRY_FLPM_5LP;
-
- entry = intel_pasid_get_entry(dev, svm->pasid);
- WRITE_ONCE(entry->val[0], pasid_entry_val);
-
- /*
- * Flush PASID cache when a PASID table entry becomes
- * present.
- */
- if (cap_caching_mode(iommu->cap))
- intel_flush_pasid_dev(svm, sdev, svm->pasid);
+ }
+
+ ret = intel_pasid_setup_first_level(iommu, mm, dev,
+ sdev->did, svm->pasid);
+ if (ret) {
+ if (mm)
+ mmu_notifier_unregister(&svm->notifier, mm);
+ intel_pasid_free_id(svm->pasid);
+ kfree(svm);
+ kfree(sdev);
+ goto out;
+ }
list_add_tail(&svm->list, &global_svm_list);
}
@@ -476,10 +452,11 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
* to use. We have a *shared* PASID table, because it's
* large and has to be physically contiguous. So it's
* hard to be as defensive as we might like. */
- intel_flush_pasid_dev(svm, sdev, svm->pasid);
+ intel_pasid_tear_down_first_level(iommu, dev,
+ sdev->did,
+ 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)) {
intel_pasid_free_id(svm->pasid);
diff --git a/include/linux/dma_remapping.h b/include/linux/dma_remapping.h
index 21b3e7d33d68..6f01e54702e5 100644
--- a/include/linux/dma_remapping.h
+++ b/include/linux/dma_remapping.h
@@ -21,14 +21,7 @@
#define CONTEXT_TT_MULTI_LEVEL 0
#define CONTEXT_TT_DEV_IOTLB 1
#define CONTEXT_TT_PASS_THROUGH 2
-/* Extended context entry types */
-#define CONTEXT_TT_PT_PASID 4
-#define CONTEXT_TT_PT_PASID_DEV_IOTLB 5
-#define CONTEXT_TT_MASK (7ULL << 2)
-
-#define CONTEXT_DINVE (1ULL << 8)
-#define CONTEXT_PRS (1ULL << 9)
-#define CONTEXT_PASIDE (1ULL << 11)
+#define CONTEXT_PASIDE BIT_ULL(3)
struct intel_iommu;
struct dmar_domain;
--
2.17.1