[PATCH v2 08/10] iommu/amd: Convert dev_data lock from spinlock to mutex

[Vasant Hegde <vasant.hegde@amd.com>]

Currently in attach device path it takes dev_data->spinlock. But as per
design attach device path can sleep. Also if device is PRI capable then
it adds device to IOMMU fault handler queue which takes mutex. Hence
currently PRI enablement is done outside dev_data lock.

Covert dev_data lock from spinlock to mutex so that it follows the
design and also PRI enablement can be done properly.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
---
 drivers/iommu/amd/amd_iommu_types.h |  2 +-
 drivers/iommu/amd/iommu.c           | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index ad6ce13c0b7b..a13c347baffd 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -836,7 +836,7 @@ struct devid_map {
  */
 struct iommu_dev_data {
 	/*Protect against attach/detach races */
-	spinlock_t lock;
+	struct mutex mutex;
 
 	struct list_head list;		  /* For domain->dev_list */
 	struct llist_node dev_data_list;  /* For global dev_data_list */
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index ab8bedf55459..0f83e1b3fb0c 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -207,7 +207,7 @@ static struct iommu_dev_data *alloc_dev_data(struct amd_iommu *iommu, u16 devid)
 	if (!dev_data)
 		return NULL;
 
-	spin_lock_init(&dev_data->lock);
+	mutex_init(&dev_data->mutex);
 	dev_data->devid = devid;
 	ratelimit_default_init(&dev_data->rs);
 
@@ -2088,7 +2088,7 @@ static int attach_device(struct device *dev,
 	struct amd_iommu *iommu = get_amd_iommu_from_dev_data(dev_data);
 	int ret = 0;
 
-	spin_lock(&dev_data->lock);
+	mutex_lock(&dev_data->mutex);
 
 	if (dev_data->domain != NULL) {
 		ret = -EBUSY;
@@ -2114,7 +2114,7 @@ static int attach_device(struct device *dev,
 	}
 
 out:
-	spin_unlock(&dev_data->lock);
+	mutex_unlock(&dev_data->mutex);
 
 	return ret;
 }
@@ -2129,7 +2129,7 @@ static void detach_device(struct device *dev)
 	struct protection_domain *domain = dev_data->domain;
 	bool ppr = dev_data->ppr;
 
-	spin_lock(&dev_data->lock);
+	mutex_lock(&dev_data->mutex);
 
 	/*
 	 * First check if the device is still attached. It might already
@@ -2165,7 +2165,7 @@ static void detach_device(struct device *dev)
 	pdom_detach_iommu(iommu, domain);
 
 out:
-	spin_unlock(&dev_data->lock);
+	mutex_unlock(&dev_data->mutex);
 
 	/* Remove IOPF handler */
 	if (ppr)
@@ -2430,9 +2430,9 @@ static int blocked_domain_attach_device(struct iommu_domain *domain,
 		detach_device(dev);
 
 	/* Clear DTE and flush the entry */
-	spin_lock(&dev_data->lock);
+	mutex_lock(&dev_data->mutex);
 	dev_update_dte(dev_data, false);
-	spin_unlock(&dev_data->lock);
+	mutex_unlock(&dev_data->mutex);
 
 	return 0;
 }
-- 
2.31.1