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Message-Id: <20200317070229.21131-2-baolu.lu@linux.intel.com>
Date: Tue, 17 Mar 2020 15:02:25 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>
Cc: ashok.raj@...el.com, jacob.jun.pan@...ux.intel.com,
Liu Yi L <yi.l.liu@...el.com>, kevin.tian@...el.com,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 1/5] iommu/vt-d: Add get_domain_info() helper
Add a get_domain_info() helper to retrieve the valid per-device
iommu private data.
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
drivers/iommu/intel-iommu.c | 38 +++++++++++++++++++++++++------------
drivers/iommu/intel-pasid.c | 12 ++++++------
drivers/iommu/intel-svm.c | 2 +-
include/linux/intel-iommu.h | 1 +
4 files changed, 34 insertions(+), 19 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 7f93ad70c6c2..fdba70bf39cc 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -383,6 +383,21 @@ EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
#define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1))
#define DEFER_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-2))
+struct device_domain_info *get_domain_info(struct device *dev)
+{
+ struct device_domain_info *info;
+
+ if (!dev)
+ return NULL;
+
+ info = dev->archdata.iommu;
+ if (unlikely(info == DUMMY_DEVICE_DOMAIN_INFO ||
+ info == DEFER_DEVICE_DOMAIN_INFO))
+ return NULL;
+
+ return info;
+}
+
DEFINE_SPINLOCK(device_domain_lock);
static LIST_HEAD(device_domain_list);
@@ -2451,7 +2466,7 @@ struct dmar_domain *find_domain(struct device *dev)
dev = &pci_real_dma_dev(to_pci_dev(dev))->dev;
/* No lock here, assumes no domain exit in normal case */
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (likely(info))
return info->domain;
@@ -4951,9 +4966,8 @@ static void dmar_remove_one_dev_info(struct device *dev)
unsigned long flags;
spin_lock_irqsave(&device_domain_lock, flags);
- info = dev->archdata.iommu;
- if (info && info != DEFER_DEVICE_DOMAIN_INFO
- && info != DUMMY_DEVICE_DOMAIN_INFO)
+ info = get_domain_info(dev);
+ if (info)
__dmar_remove_one_dev_info(info);
spin_unlock_irqrestore(&device_domain_lock, flags);
}
@@ -5043,7 +5057,7 @@ static void intel_iommu_domain_free(struct iommu_domain *domain)
static inline bool
is_aux_domain(struct device *dev, struct iommu_domain *domain)
{
- struct device_domain_info *info = dev->archdata.iommu;
+ struct device_domain_info *info = get_domain_info(dev);
return info && info->auxd_enabled &&
domain->type == IOMMU_DOMAIN_UNMANAGED;
@@ -5052,7 +5066,7 @@ is_aux_domain(struct device *dev, struct iommu_domain *domain)
static void auxiliary_link_device(struct dmar_domain *domain,
struct device *dev)
{
- struct device_domain_info *info = dev->archdata.iommu;
+ struct device_domain_info *info = get_domain_info(dev);
assert_spin_locked(&device_domain_lock);
if (WARN_ON(!info))
@@ -5065,7 +5079,7 @@ static void auxiliary_link_device(struct dmar_domain *domain,
static void auxiliary_unlink_device(struct dmar_domain *domain,
struct device *dev)
{
- struct device_domain_info *info = dev->archdata.iommu;
+ struct device_domain_info *info = get_domain_info(dev);
assert_spin_locked(&device_domain_lock);
if (WARN_ON(!info))
@@ -5153,7 +5167,7 @@ static void aux_domain_remove_dev(struct dmar_domain *domain,
return;
spin_lock_irqsave(&device_domain_lock, flags);
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
iommu = info->iommu;
auxiliary_unlink_device(domain, dev);
@@ -5551,7 +5565,7 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev)
spin_lock(&iommu->lock);
ret = -EINVAL;
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!info || !info->pasid_supported)
goto out;
@@ -5647,7 +5661,7 @@ static int intel_iommu_enable_auxd(struct device *dev)
return -ENODEV;
spin_lock_irqsave(&device_domain_lock, flags);
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
info->auxd_enabled = 1;
spin_unlock_irqrestore(&device_domain_lock, flags);
@@ -5660,7 +5674,7 @@ static int intel_iommu_disable_auxd(struct device *dev)
unsigned long flags;
spin_lock_irqsave(&device_domain_lock, flags);
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!WARN_ON(!info))
info->auxd_enabled = 0;
spin_unlock_irqrestore(&device_domain_lock, flags);
@@ -5742,7 +5756,7 @@ intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
static bool
intel_iommu_dev_feat_enabled(struct device *dev, enum iommu_dev_features feat)
{
- struct device_domain_info *info = dev->archdata.iommu;
+ struct device_domain_info *info = get_domain_info(dev);
if (feat == IOMMU_DEV_FEAT_AUX)
return scalable_mode_support() && info && info->auxd_enabled;
diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index 22b30f10b396..692e808e1a4e 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -94,7 +94,7 @@ int intel_pasid_alloc_table(struct device *dev)
int size;
might_sleep();
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table))
return -EINVAL;
@@ -141,7 +141,7 @@ void intel_pasid_free_table(struct device *dev)
struct pasid_entry *table;
int i, max_pde;
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!info || !dev_is_pci(dev) || !info->pasid_table)
return;
@@ -167,7 +167,7 @@ struct pasid_table *intel_pasid_get_table(struct device *dev)
{
struct device_domain_info *info;
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!info)
return NULL;
@@ -178,7 +178,7 @@ int intel_pasid_get_dev_max_id(struct device *dev)
{
struct device_domain_info *info;
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!info || !info->pasid_table)
return 0;
@@ -199,7 +199,7 @@ struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid)
return NULL;
dir = pasid_table->table;
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
dir_index = pasid >> PASID_PDE_SHIFT;
index = pasid & PASID_PTE_MASK;
@@ -394,7 +394,7 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
struct device_domain_info *info;
u16 sid, qdep, pfsid;
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!info || !info->ats_enabled)
return;
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index e576aba2dd1e..1148f7994747 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -301,7 +301,7 @@ static int intel_svm_bind_mm(struct device *dev, int flags, struct svm_dev_ops *
goto out;
}
- info = dev->archdata.iommu;
+ info = get_domain_info(dev);
if (!info || !info->pasid_supported) {
kfree(sdev);
goto out;
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index d512f9cd63be..a29b464e937b 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -667,6 +667,7 @@ int for_each_device_domain(int (*fn)(struct device_domain_info *info,
void iommu_flush_write_buffer(struct intel_iommu *iommu);
int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev);
struct dmar_domain *find_domain(struct device *dev);
+struct device_domain_info *get_domain_info(struct device *dev);
#ifdef CONFIG_INTEL_IOMMU_SVM
extern void intel_svm_check(struct intel_iommu *iommu);
--
2.17.1
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