Virtualization - Apr 2020 - [PATCH v2 00/33] iommu: Move iommu_group setup to IOMMU core code

Hi,

here is the second version of this patch-set. The first version with
some more introductory text can be found here:

	https://lore.kernel.org/lkml/20200407183742.4344-1-joro at 8bytes.org/

Changes v1->v2:

	* Rebased to v5.7-rc1

	* Re-wrote the arm-smmu changes as suggested by Robin Murphy

	* Re-worked the Exynos patches to hopefully not break the
	  driver anymore

	* Fixed a missing mutex_unlock() reported by Marek Szyprowski,
	  thanks for that.

There is also a git-branch available with these patches applied:

	https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=iommu-probe-device-v2

Please review.

Thanks,

	Joerg

Joerg Roedel (32):
  iommu: Move default domain allocation to separate function
  iommu/amd: Implement iommu_ops->def_domain_type call-back
  iommu/vt-d: Wire up iommu_ops->def_domain_type
  iommu/amd: Remove dma_mask check from check_device()
  iommu/amd: Return -ENODEV in add_device when device is not handled by
    IOMMU
  iommu: Add probe_device() and remove_device() call-backs
  iommu: Move default domain allocation to iommu_probe_device()
  iommu: Keep a list of allocated groups in __iommu_probe_device()
  iommu: Move new probe_device path to separate function
  iommu: Split off default domain allocation from group assignment
  iommu: Move iommu_group_create_direct_mappings() out of
    iommu_group_add_device()
  iommu: Export bus_iommu_probe() and make is safe for re-probing
  iommu/amd: Remove dev_data->passthrough
  iommu/amd: Convert to probe/release_device() call-backs
  iommu/vt-d: Convert to probe/release_device() call-backs
  iommu/arm-smmu: Convert to probe/release_device() call-backs
  iommu/pamu: Convert to probe/release_device() call-backs
  iommu/s390: Convert to probe/release_device() call-backs
  iommu/virtio: Convert to probe/release_device() call-backs
  iommu/msm: Convert to probe/release_device() call-backs
  iommu/mediatek: Convert to probe/release_device() call-backs
  iommu/mediatek-v1 Convert to probe/release_device() call-backs
  iommu/qcom: Convert to probe/release_device() call-backs
  iommu/rockchip: Convert to probe/release_device() call-backs
  iommu/tegra: Convert to probe/release_device() call-backs
  iommu/renesas: Convert to probe/release_device() call-backs
  iommu/omap: Remove orphan_dev tracking
  iommu/omap: Convert to probe/release_device() call-backs
  iommu/exynos: Use first SYSMMU in controllers list for IOMMU core
  iommu/exynos: Convert to probe/release_device() call-backs
  iommu: Remove add_device()/remove_device() code-paths
  iommu: Unexport iommu_group_get_for_dev()

Sai Praneeth Prakhya (1):
  iommu: Add def_domain_type() callback in iommu_ops

 drivers/iommu/amd_iommu.c       |  97 ++++----
 drivers/iommu/amd_iommu_types.h |   1 -
 drivers/iommu/arm-smmu-v3.c     |  38 +--
 drivers/iommu/arm-smmu.c        |  39 ++--
 drivers/iommu/exynos-iommu.c    |  24 +-
 drivers/iommu/fsl_pamu_domain.c |  22 +-
 drivers/iommu/intel-iommu.c     |  68 +-----
 drivers/iommu/iommu.c           | 393 +++++++++++++++++++++++++-------
 drivers/iommu/ipmmu-vmsa.c      |  60 ++---
 drivers/iommu/msm_iommu.c       |  34 +--
 drivers/iommu/mtk_iommu.c       |  24 +-
 drivers/iommu/mtk_iommu_v1.c    |  50 ++--
 drivers/iommu/omap-iommu.c      |  99 ++------
 drivers/iommu/qcom_iommu.c      |  24 +-
 drivers/iommu/rockchip-iommu.c  |  26 +--
 drivers/iommu/s390-iommu.c      |  22 +-
 drivers/iommu/tegra-gart.c      |  24 +-
 drivers/iommu/tegra-smmu.c      |  31 +--
 drivers/iommu/virtio-iommu.c    |  41 +---
 include/linux/iommu.h           |  21 +-
 20 files changed, 533 insertions(+), 605 deletions(-)

-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Move the code out of iommu_group_get_for_dev() into a separate
function.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 74 ++++++++++++++++++++++++++-----------------
 1 file changed, 45 insertions(+), 29 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 2b471419e26c..bfe011760ed1 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1361,6 +1361,41 @@ struct iommu_group *fsl_mc_device_group(struct device
*dev)
 }
 EXPORT_SYMBOL_GPL(fsl_mc_device_group);
 
+static int iommu_alloc_default_domain(struct device *dev,
+				      struct iommu_group *group)
+{
+	struct iommu_domain *dom;
+
+	if (group->default_domain)
+		return 0;
+
+	dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
+	if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
+		dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
+		if (dom) {
+			dev_warn(dev,
+				 "failed to allocate default IOMMU domain of type %u; falling back to
IOMMU_DOMAIN_DMA",
+				 iommu_def_domain_type);
+		}
+	}
+
+	if (!dom)
+		return -ENOMEM;
+
+	group->default_domain = dom;
+	if (!group->domain)
+		group->domain = dom;
+
+	if (!iommu_dma_strict) {
+		int attr = 1;
+		iommu_domain_set_attr(dom,
+				      DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
+				      &attr);
+	}
+
+	return 0;
+}
+
 /**
  * iommu_group_get_for_dev - Find or create the IOMMU group for a device
  * @dev: target device
@@ -1393,40 +1428,21 @@ struct iommu_group *iommu_group_get_for_dev(struct
device *dev)
 
 	/*
 	 * Try to allocate a default domain - needs support from the
-	 * IOMMU driver.
+	 * IOMMU driver. There are still some drivers which don't support
+	 * default domains, so the return value is not yet checked.
 	 */
-	if (!group->default_domain) {
-		struct iommu_domain *dom;
-
-		dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
-		if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
-			dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
-			if (dom) {
-				dev_warn(dev,
-					 "failed to allocate default IOMMU domain of type %u; falling back to
IOMMU_DOMAIN_DMA",
-					 iommu_def_domain_type);
-			}
-		}
-
-		group->default_domain = dom;
-		if (!group->domain)
-			group->domain = dom;
-
-		if (dom && !iommu_dma_strict) {
-			int attr = 1;
-			iommu_domain_set_attr(dom,
-					      DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
-					      &attr);
-		}
-	}
+	iommu_alloc_default_domain(dev, group);
 
 	ret = iommu_group_add_device(group, dev);
-	if (ret) {
-		iommu_group_put(group);
-		return ERR_PTR(ret);
-	}
+	if (ret)
+		goto out_put_group;
 
 	return group;
+
+out_put_group:
+	iommu_group_put(group);
+
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(iommu_group_get_for_dev);
 
-- 
2.17.1

From: Sai Praneeth Prakhya <sai.praneeth.prakhya at intel.com>

Some devices are reqired to use a specific type (identity or dma)
of default domain when they are used with a vendor iommu. When the
system level default domain type is different from it, the vendor
iommu driver has to request a new default domain with
iommu_request_dma_domain_for_dev() and iommu_request_dm_for_dev()
in the add_dev() callback. Unfortunately, these two helpers only
work when the group hasn't been assigned to any other devices,
hence, some vendor iommu driver has to use a private domain if
it fails to request a new default one.

This adds def_domain_type() callback in the iommu_ops, so that
any special requirement of default domain for a device could be
aware by the iommu generic layer.

Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya at intel.com>
Signed-off-by: Lu Baolu <baolu.lu at linux.intel.com>
[ jroedel at suse.de: Added iommu_get_def_domain_type() function and use
                   it to allocate the default domain ]
Co-developed-by: Joerg Roedel <jroedel at suse.de>
Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 20 +++++++++++++++++---
 include/linux/iommu.h |  6 ++++++
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index bfe011760ed1..5877abd9b693 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1361,21 +1361,35 @@ struct iommu_group *fsl_mc_device_group(struct device
*dev)
 }
 EXPORT_SYMBOL_GPL(fsl_mc_device_group);
 
+static int iommu_get_def_domain_type(struct device *dev)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	unsigned int type = 0;
+
+	if (ops->def_domain_type)
+		type = ops->def_domain_type(dev);
+
+	return (type == 0) ? iommu_def_domain_type : type;
+}
+
 static int iommu_alloc_default_domain(struct device *dev,
 				      struct iommu_group *group)
 {
 	struct iommu_domain *dom;
+	unsigned int type;
 
 	if (group->default_domain)
 		return 0;
 
-	dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
-	if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
+	type = iommu_get_def_domain_type(dev);
+
+	dom = __iommu_domain_alloc(dev->bus, type);
+	if (!dom && type != IOMMU_DOMAIN_DMA) {
 		dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
 		if (dom) {
 			dev_warn(dev,
 				 "failed to allocate default IOMMU domain of type %u; falling back to
IOMMU_DOMAIN_DMA",
-				 iommu_def_domain_type);
+				 type);
 		}
 	}
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7ef8b0bda695..1f027b07e499 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -248,6 +248,10 @@ struct iommu_iotlb_gather {
  * @cache_invalidate: invalidate translation caches
  * @sva_bind_gpasid: bind guest pasid and mm
  * @sva_unbind_gpasid: unbind guest pasid and mm
+ * @def_domain_type: device default domain type, return value:
+ *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
+ *		- IOMMU_DOMAIN_DMA: must use a dma domain
+ *		- 0: use the default setting
  * @pgsize_bitmap: bitmap of all possible supported page sizes
  * @owner: Driver module providing these ops
  */
@@ -318,6 +322,8 @@ struct iommu_ops {
 
 	int (*sva_unbind_gpasid)(struct device *dev, int pasid);
 
+	int (*def_domain_type)(struct device *dev);
+
 	unsigned long pgsize_bitmap;
 	struct module *owner;
 };
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Implement the new def_domain_type call-back for the AMD IOMMU driver.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/amd_iommu.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 20cce366e951..73b4f84cf449 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2661,6 +2661,20 @@ static void amd_iommu_iotlb_sync(struct iommu_domain
*domain,
 	amd_iommu_flush_iotlb_all(domain);
 }
 
+static int amd_iommu_def_domain_type(struct device *dev)
+{
+	struct iommu_dev_data *dev_data;
+
+	dev_data = get_dev_data(dev);
+	if (!dev_data)
+		return 0;
+
+	if (dev_data->iommu_v2)
+		return IOMMU_DOMAIN_IDENTITY;
+
+	return 0;
+}
+
 const struct iommu_ops amd_iommu_ops = {
 	.capable = amd_iommu_capable,
 	.domain_alloc = amd_iommu_domain_alloc,
@@ -2680,6 +2694,7 @@ const struct iommu_ops amd_iommu_ops = {
 	.pgsize_bitmap	= AMD_IOMMU_PGSIZES,
 	.flush_iotlb_all = amd_iommu_flush_iotlb_all,
 	.iotlb_sync = amd_iommu_iotlb_sync,
+	.def_domain_type = amd_iommu_def_domain_type,
 };
 
 /*****************************************************************************
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

The Intel VT-d driver already has a matching function to determine the
default domain type for a device. Wire it up in intel_iommu_ops.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/intel-iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index ef0a5246700e..b9f905a55dda 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -6209,6 +6209,7 @@ const struct iommu_ops intel_iommu_ops = {
 	.dev_enable_feat	= intel_iommu_dev_enable_feat,
 	.dev_disable_feat	= intel_iommu_dev_disable_feat,
 	.is_attach_deferred	= intel_iommu_is_attach_deferred,
+	.def_domain_type	= device_def_domain_type,
 	.pgsize_bitmap		= INTEL_IOMMU_PGSIZES,
 };
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

The check was only needed for the DMA-API implementation in the AMD
IOMMU driver, which no longer exists.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 73b4f84cf449..504f2db75eda 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -326,7 +326,7 @@ static bool check_device(struct device *dev)
 {
 	int devid;
 
-	if (!dev || !dev->dma_mask)
+	if (!dev)
 		return false;
 
 	devid = get_device_id(dev);
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

When check_device() fails on the device, it is not handled by the
IOMMU and amd_iommu_add_device() needs to return -ENODEV.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/amd_iommu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 504f2db75eda..3e0d27f7622e 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2157,9 +2157,12 @@ static int amd_iommu_add_device(struct device *dev)
 	struct amd_iommu *iommu;
 	int ret, devid;
 
-	if (!check_device(dev) || get_dev_data(dev))
+	if (get_dev_data(dev))
 		return 0;
 
+	if (!check_device(dev))
+		return -ENODEV;
+
 	devid = get_device_id(dev);
 	if (devid < 0)
 		return devid;
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Add call-backs to 'struct iommu_ops' as an alternative to the
add_device() and remove_device() call-backs, which will be removed when
all drivers are converted.

The new call-backs will not setupt IOMMU groups and domains anymore,
so also add a probe_finalize() call-back where the IOMMU driver can do
per-device setup work which require the device to be set up with a
group and a domain.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 63 ++++++++++++++++++++++++++++++++++++++-----
 include/linux/iommu.h |  9 +++++++
 2 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5877abd9b693..6cfe7799dc8c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -174,6 +174,36 @@ static void dev_iommu_free(struct device *dev)
 	dev->iommu = NULL;
 }
 
+static int __iommu_probe_device(struct device *dev)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	struct iommu_device *iommu_dev;
+	struct iommu_group *group;
+	int ret;
+
+	iommu_dev = ops->probe_device(dev);
+	if (IS_ERR(iommu_dev))
+		return PTR_ERR(iommu_dev);
+
+	dev->iommu->iommu_dev = iommu_dev;
+
+	group = iommu_group_get_for_dev(dev);
+	if (!IS_ERR(group)) {
+		ret = PTR_ERR(group);
+		goto out_release;
+	}
+	iommu_group_put(group);
+
+	iommu_device_link(iommu_dev, dev);
+
+	return 0;
+
+out_release:
+	ops->release_device(dev);
+
+	return ret;
+}
+
 int iommu_probe_device(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
@@ -191,10 +221,17 @@ int iommu_probe_device(struct device *dev)
 		goto err_free_dev_param;
 	}
 
-	ret = ops->add_device(dev);
+	if (ops->probe_device)
+		ret = __iommu_probe_device(dev);
+	else
+		ret = ops->add_device(dev);
+
 	if (ret)
 		goto err_module_put;
 
+	if (ops->probe_finalize)
+		ops->probe_finalize(dev);
+
 	return 0;
 
 err_module_put:
@@ -204,17 +241,31 @@ int iommu_probe_device(struct device *dev)
 	return ret;
 }
 
+static void __iommu_release_device(struct device *dev)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+
+	iommu_device_unlink(dev->iommu->iommu_dev, dev);
+
+	iommu_group_remove_device(dev);
+
+	ops->release_device(dev);
+}
+
 void iommu_release_device(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 
-	if (dev->iommu_group)
+	if (!dev->iommu)
+		return;
+
+	if (ops->release_device)
+		__iommu_release_device(dev);
+	else if (dev->iommu_group)
 		ops->remove_device(dev);
 
-	if (dev->iommu) {
-		module_put(ops->owner);
-		dev_iommu_free(dev);
-	}
+	module_put(ops->owner);
+	dev_iommu_free(dev);
 }
 
 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 1f027b07e499..30170d191e5e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -225,6 +225,10 @@ struct iommu_iotlb_gather {
  * @iova_to_phys: translate iova to physical address
  * @add_device: add device to iommu grouping
  * @remove_device: remove device from iommu grouping
+ * @probe_device: Add device to iommu driver handling
+ * @release_device: Remove device from iommu driver handling
+ * @probe_finalize: Do final setup work after the device is added to an IOMMU
+ *                  group and attached to the groups domain
  * @device_group: find iommu group for a particular device
  * @domain_get_attr: Query domain attributes
  * @domain_set_attr: Change domain attributes
@@ -275,6 +279,9 @@ struct iommu_ops {
 	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 	int (*add_device)(struct device *dev);
 	void (*remove_device)(struct device *dev);
+	struct iommu_device *(*probe_device)(struct device *dev);
+	void (*release_device)(struct device *dev);
+	void (*probe_finalize)(struct device *dev);
 	struct iommu_group *(*device_group)(struct device *dev);
 	int (*domain_get_attr)(struct iommu_domain *domain,
 			       enum iommu_attr attr, void *data);
@@ -375,6 +382,7 @@ struct iommu_fault_param {
  *
  * @fault_param: IOMMU detected device fault reporting data
  * @fwspec:	 IOMMU fwspec data
+ * @iommu_dev:	 IOMMU device this device is linked to
  * @priv:	 IOMMU Driver private data
  *
  * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
@@ -384,6 +392,7 @@ struct dev_iommu {
 	struct mutex lock;
 	struct iommu_fault_param	*fault_param;
 	struct iommu_fwspec		*fwspec;
+	struct iommu_device		*iommu_dev;
 	void				*priv;
 };
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Well, not really. The call to iommu_alloc_default_domain() in
iommu_group_get_for_dev() has to stay around as long as there are
IOMMU drivers using the add/remove_device() call-backs instead of
probe/release_device().

Those drivers expect that iommu_group_get_for_dev() returns the device
attached to a group and the group set up with a default domain (and
the device attached to the groups current domain).

But when all drivers are converted this compatability mess can be
removed.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 102 +++++++++++++++++++++++++++++-------------
 1 file changed, 71 insertions(+), 31 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 6cfe7799dc8c..7a385c18e1a5 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -79,6 +79,16 @@ static bool iommu_cmd_line_dma_api(void)
 	return !!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API);
 }
 
+static int iommu_alloc_default_domain(struct device *dev);
+static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
+						 unsigned type);
+static int __iommu_attach_device(struct iommu_domain *domain,
+				 struct device *dev);
+static int __iommu_attach_group(struct iommu_domain *domain,
+				struct iommu_group *group);
+static void __iommu_detach_group(struct iommu_domain *domain,
+				 struct iommu_group *group);
+
 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store)		\
 struct iommu_group_attribute iommu_group_attr_##_name =		\
 	__ATTR(_name, _mode, _show, _store)
@@ -221,10 +231,29 @@ int iommu_probe_device(struct device *dev)
 		goto err_free_dev_param;
 	}
 
-	if (ops->probe_device)
+	if (ops->probe_device) {
+		struct iommu_group *group;
+
 		ret = __iommu_probe_device(dev);
-	else
+
+		/*
+		 * Try to allocate a default domain - needs support from the
+		 * IOMMU driver. There are still some drivers which don't
+		 * support default domains, so the return value is not yet
+		 * checked.
+		 */
+		if (!ret)
+			iommu_alloc_default_domain(dev);
+
+		group = iommu_group_get(dev);
+		if (group && group->default_domain) {
+			ret = __iommu_attach_device(group->default_domain, dev);
+			iommu_group_put(group);
+		}
+
+	} else {
 		ret = ops->add_device(dev);
+	}
 
 	if (ret)
 		goto err_module_put;
@@ -268,15 +297,6 @@ void iommu_release_device(struct device *dev)
 	dev_iommu_free(dev);
 }
 
-static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
-						 unsigned type);
-static int __iommu_attach_device(struct iommu_domain *domain,
-				 struct device *dev);
-static int __iommu_attach_group(struct iommu_domain *domain,
-				struct iommu_group *group);
-static void __iommu_detach_group(struct iommu_domain *domain,
-				 struct iommu_group *group);
-
 static int __init iommu_set_def_domain_type(char *str)
 {
 	bool pt;
@@ -1423,25 +1443,18 @@ static int iommu_get_def_domain_type(struct device *dev)
 	return (type == 0) ? iommu_def_domain_type : type;
 }
 
-static int iommu_alloc_default_domain(struct device *dev,
-				      struct iommu_group *group)
+static int iommu_group_alloc_default_domain(struct bus_type *bus,
+					    struct iommu_group *group,
+					    unsigned int type)
 {
 	struct iommu_domain *dom;
-	unsigned int type;
-
-	if (group->default_domain)
-		return 0;
 
-	type = iommu_get_def_domain_type(dev);
-
-	dom = __iommu_domain_alloc(dev->bus, type);
+	dom = __iommu_domain_alloc(bus, type);
 	if (!dom && type != IOMMU_DOMAIN_DMA) {
-		dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
-		if (dom) {
-			dev_warn(dev,
-				 "failed to allocate default IOMMU domain of type %u; falling back to
IOMMU_DOMAIN_DMA",
-				 type);
-		}
+		dom = __iommu_domain_alloc(bus, IOMMU_DOMAIN_DMA);
+		if (dom)
+			pr_warn("Failed to allocate default IOMMU domain of type %u for group
%s - Falling back to IOMMU_DOMAIN_DMA",
+				type, group->name);
 	}
 
 	if (!dom)
@@ -1461,6 +1474,23 @@ static int iommu_alloc_default_domain(struct device *dev,
 	return 0;
 }
 
+static int iommu_alloc_default_domain(struct device *dev)
+{
+	struct iommu_group *group;
+	unsigned int type;
+
+	group = iommu_group_get(dev);
+	if (!group)
+		return -ENODEV;
+
+	if (group->default_domain)
+		return 0;
+
+	type = iommu_get_def_domain_type(dev);
+
+	return iommu_group_alloc_default_domain(dev->bus, group, type);
+}
+
 /**
  * iommu_group_get_for_dev - Find or create the IOMMU group for a device
  * @dev: target device
@@ -1491,16 +1521,26 @@ struct iommu_group *iommu_group_get_for_dev(struct
device *dev)
 	if (IS_ERR(group))
 		return group;
 
+	ret = iommu_group_add_device(group, dev);
+	if (ret)
+		goto out_put_group;
+
 	/*
 	 * Try to allocate a default domain - needs support from the
 	 * IOMMU driver. There are still some drivers which don't support
-	 * default domains, so the return value is not yet checked.
+	 * default domains, so the return value is not yet checked. Only
+	 * allocate the domain here when the driver still has the
+	 * add_device/remove_device call-backs implemented.
 	 */
-	iommu_alloc_default_domain(dev, group);
+	if (!ops->probe_device) {
+		iommu_alloc_default_domain(dev);
 
-	ret = iommu_group_add_device(group, dev);
-	if (ret)
-		goto out_put_group;
+		if (group->default_domain)
+			ret = __iommu_attach_device(group->default_domain, dev);
+
+		if (ret)
+			goto out_put_group;
+	}
 
 	return group;
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

This is needed to defer default_domain allocation for new IOMMU groups
until all devices have been added to the group.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7a385c18e1a5..18eb3623bd00 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -44,6 +44,7 @@ struct iommu_group {
 	int id;
 	struct iommu_domain *default_domain;
 	struct iommu_domain *domain;
+	struct list_head entry;
 };
 
 struct group_device {
@@ -184,7 +185,7 @@ static void dev_iommu_free(struct device *dev)
 	dev->iommu = NULL;
 }
 
-static int __iommu_probe_device(struct device *dev)
+static int __iommu_probe_device(struct device *dev, struct list_head
*group_list)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	struct iommu_device *iommu_dev;
@@ -204,6 +205,9 @@ static int __iommu_probe_device(struct device *dev)
 	}
 	iommu_group_put(group);
 
+	if (group_list && !group->default_domain &&
list_empty(&group->entry))
+		list_add_tail(&group->entry, group_list);
+
 	iommu_device_link(iommu_dev, dev);
 
 	return 0;
@@ -234,7 +238,7 @@ int iommu_probe_device(struct device *dev)
 	if (ops->probe_device) {
 		struct iommu_group *group;
 
-		ret = __iommu_probe_device(dev);
+		ret = __iommu_probe_device(dev, NULL);
 
 		/*
 		 * Try to allocate a default domain - needs support from the
@@ -567,6 +571,7 @@ struct iommu_group *iommu_group_alloc(void)
 	group->kobj.kset = iommu_group_kset;
 	mutex_init(&group->mutex);
 	INIT_LIST_HEAD(&group->devices);
+	INIT_LIST_HEAD(&group->entry);
 	BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
 
 	ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL);
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

This makes it easier to remove to old code-path when all drivers are
converted. As a side effect that it also fixes the error cleanup
path.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 69 ++++++++++++++++++++++++++++---------------
 1 file changed, 46 insertions(+), 23 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 18eb3623bd00..8be047a4808f 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -218,12 +218,55 @@ static int __iommu_probe_device(struct device *dev, struct
list_head *group_list
 	return ret;
 }
 
+static int __iommu_probe_device_helper(struct device *dev)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	struct iommu_group *group;
+	int ret;
+
+	ret = __iommu_probe_device(dev, NULL);
+	if (ret)
+		goto err_out;
+
+	/*
+	 * Try to allocate a default domain - needs support from the
+	 * IOMMU driver. There are still some drivers which don't
+	 * support default domains, so the return value is not yet
+	 * checked.
+	 */
+	iommu_alloc_default_domain(dev);
+
+	group = iommu_group_get(dev);
+	if (!group)
+		goto err_release;
+
+	if (group->default_domain)
+		ret = __iommu_attach_device(group->default_domain, dev);
+
+	iommu_group_put(group);
+
+	if (ret)
+		goto err_release;
+
+	if (ops->probe_finalize)
+		ops->probe_finalize(dev);
+
+	return 0;
+
+err_release:
+	iommu_release_device(dev);
+err_out:
+	return ret;
+
+}
+
 int iommu_probe_device(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	int ret;
 
 	WARN_ON(dev->iommu_group);
+
 	if (!ops)
 		return -EINVAL;
 
@@ -235,30 +278,10 @@ int iommu_probe_device(struct device *dev)
 		goto err_free_dev_param;
 	}
 
-	if (ops->probe_device) {
-		struct iommu_group *group;
-
-		ret = __iommu_probe_device(dev, NULL);
-
-		/*
-		 * Try to allocate a default domain - needs support from the
-		 * IOMMU driver. There are still some drivers which don't
-		 * support default domains, so the return value is not yet
-		 * checked.
-		 */
-		if (!ret)
-			iommu_alloc_default_domain(dev);
-
-		group = iommu_group_get(dev);
-		if (group && group->default_domain) {
-			ret = __iommu_attach_device(group->default_domain, dev);
-			iommu_group_put(group);
-		}
-
-	} else {
-		ret = ops->add_device(dev);
-	}
+	if (ops->probe_device)
+		return __iommu_probe_device_helper(dev);
 
+	ret = ops->add_device(dev);
 	if (ret)
 		goto err_module_put;
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

When a bus is initialized with iommu-ops, all devices on the bus are
scanned and iommu-groups are allocated for them, and each groups will
also get a default domain allocated.

Until now this happened as soon as the group was created and the first
device added to it. When other devices with different default domain
requirements were added to the group later on, the default domain was
re-allocated, if possible.

This resulted in some back and forth and unnecessary allocations, so
change the flow to defer default domain allocation until all devices
have been added to their respective IOMMU groups.

The default domains are allocated for newly allocated groups after
each device on the bus is handled and was probed by the IOMMU driver.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 154 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 151 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8be047a4808f..7de0e29db333 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -199,7 +199,7 @@ static int __iommu_probe_device(struct device *dev, struct
list_head *group_list
 	dev->iommu->iommu_dev = iommu_dev;
 
 	group = iommu_group_get_for_dev(dev);
-	if (!IS_ERR(group)) {
+	if (IS_ERR(group)) {
 		ret = PTR_ERR(group);
 		goto out_release;
 	}
@@ -1599,6 +1599,37 @@ static int add_iommu_group(struct device *dev, void
*data)
 	return ret;
 }
 
+static int probe_iommu_group(struct device *dev, void *data)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	struct list_head *group_list = data;
+	int ret;
+
+	if (!dev_iommu_get(dev))
+		return -ENOMEM;
+
+	if (!try_module_get(ops->owner)) {
+		ret = -EINVAL;
+		goto err_free_dev_iommu;
+	}
+
+	ret = __iommu_probe_device(dev, group_list);
+	if (ret)
+		goto err_module_put;
+
+	return 0;
+
+err_module_put:
+	module_put(ops->owner);
+err_free_dev_iommu:
+	dev_iommu_free(dev);
+
+	if (ret == -ENODEV)
+		ret = 0;
+
+	return ret;
+}
+
 static int remove_iommu_group(struct device *dev, void *data)
 {
 	iommu_release_device(dev);
@@ -1658,10 +1689,127 @@ static int iommu_bus_notifier(struct notifier_block
*nb,
 	return 0;
 }
 
+struct __group_domain_type {
+	struct device *dev;
+	unsigned int type;
+};
+
+static int probe_get_default_domain_type(struct device *dev, void *data)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	struct __group_domain_type *gtype = data;
+	unsigned int type = 0;
+
+	if (ops->def_domain_type)
+		type = ops->def_domain_type(dev);
+
+	if (type) {
+		if (gtype->type && gtype->type != type) {
+			dev_warn(dev, "Device needs domain type %s, but device %s in the same
iommu group requires type %s - using default\n",
+				 iommu_domain_type_str(type),
+				 dev_name(gtype->dev),
+				 iommu_domain_type_str(gtype->type));
+			gtype->type = 0;
+		}
+
+		if (!gtype->dev) {
+			gtype->dev  = dev;
+			gtype->type = type;
+		}
+	}
+
+	return 0;
+}
+
+static void probe_alloc_default_domain(struct bus_type *bus,
+				       struct iommu_group *group)
+{
+	struct __group_domain_type gtype;
+
+	memset(&gtype, 0, sizeof(gtype));
+
+	/* Ask for default domain requirements of all devices in the group */
+	__iommu_group_for_each_dev(group, &gtype,
+				   probe_get_default_domain_type);
+
+	if (!gtype.type)
+		gtype.type = iommu_def_domain_type;
+
+	iommu_group_alloc_default_domain(bus, group, gtype.type);
+}
+
+static int iommu_group_do_dma_attach(struct device *dev, void *data)
+{
+	struct iommu_domain *domain = data;
+	const struct iommu_ops *ops;
+	int ret;
+
+	ret = __iommu_attach_device(domain, dev);
+
+	ops = domain->ops;
+
+	if (ret == 0 && ops->probe_finalize)
+		ops->probe_finalize(dev);
+
+	return ret;
+}
+
+static int __iommu_group_dma_attach(struct iommu_group *group)
+{
+	return __iommu_group_for_each_dev(group, group->default_domain,
+					  iommu_group_do_dma_attach);
+}
+
+static int bus_iommu_probe(struct bus_type *bus)
+{
+	const struct iommu_ops *ops = bus->iommu_ops;
+	int ret;
+
+	if (ops->probe_device) {
+		struct iommu_group *group, *next;
+		LIST_HEAD(group_list);
+
+		/*
+		 * This code-path does not allocate the default domain when
+		 * creating the iommu group, so do it after the groups are
+		 * created.
+		 */
+		ret = bus_for_each_dev(bus, NULL, &group_list, probe_iommu_group);
+		if (ret)
+			return ret;
+
+		list_for_each_entry_safe(group, next, &group_list, entry) {
+			/* Remove item from the list */
+			list_del_init(&group->entry);
+
+			mutex_lock(&group->mutex);
+
+			/* Try to allocate default domain */
+			probe_alloc_default_domain(bus, group);
+
+			if (!group->default_domain) {
+				mutex_unlock(&group->mutex);
+				continue;
+			}
+
+			ret = __iommu_group_dma_attach(group);
+
+			mutex_unlock(&group->mutex);
+
+			if (ret)
+				break;
+		}
+	} else {
+		ret = bus_for_each_dev(bus, NULL, NULL, add_iommu_group);
+	}
+
+	return ret;
+}
+
 static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
 {
-	int err;
 	struct notifier_block *nb;
+	int err;
 
 	nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
 	if (!nb)
@@ -1673,7 +1821,7 @@ static int iommu_bus_init(struct bus_type *bus, const
struct iommu_ops *ops)
 	if (err)
 		goto out_free;
 
-	err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group);
+	err = bus_iommu_probe(bus);
 	if (err)
 		goto out_err;
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

After the previous changes the iommu group may not have a default
domain when iommu_group_add_device() is called. With no default domain
iommu_group_create_direct_mappings() will do nothing and no direct
mappings will be created.

Rename iommu_group_create_direct_mappings() to
iommu_create_device_direct_mappings() to better reflect that the
function creates direct mappings only for one device and not for all
devices in the group. Then move the call to the places where a default
domain actually exists.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7de0e29db333..834a45da0ed0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -89,6 +89,8 @@ static int __iommu_attach_group(struct iommu_domain *domain,
 				struct iommu_group *group);
 static void __iommu_detach_group(struct iommu_domain *domain,
 				 struct iommu_group *group);
+static int iommu_create_device_direct_mappings(struct iommu_group *group,
+					       struct device *dev);
 
 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store)		\
 struct iommu_group_attribute iommu_group_attr_##_name =		\
@@ -243,6 +245,8 @@ static int __iommu_probe_device_helper(struct device *dev)
 	if (group->default_domain)
 		ret = __iommu_attach_device(group->default_domain, dev);
 
+	iommu_create_device_direct_mappings(group, dev);
+
 	iommu_group_put(group);
 
 	if (ret)
@@ -263,6 +267,7 @@ static int __iommu_probe_device_helper(struct device *dev)
 int iommu_probe_device(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	struct iommu_group *group;
 	int ret;
 
 	WARN_ON(dev->iommu_group);
@@ -285,6 +290,10 @@ int iommu_probe_device(struct device *dev)
 	if (ret)
 		goto err_module_put;
 
+	group = iommu_group_get(dev);
+	iommu_create_device_direct_mappings(group, dev);
+	iommu_group_put(group);
+
 	if (ops->probe_finalize)
 		ops->probe_finalize(dev);
 
@@ -736,8 +745,8 @@ int iommu_group_set_name(struct iommu_group *group, const
char *name)
 }
 EXPORT_SYMBOL_GPL(iommu_group_set_name);
 
-static int iommu_group_create_direct_mappings(struct iommu_group *group,
-					      struct device *dev)
+static int iommu_create_device_direct_mappings(struct iommu_group *group,
+					       struct device *dev)
 {
 	struct iommu_domain *domain = group->default_domain;
 	struct iommu_resv_region *entry;
@@ -841,8 +850,6 @@ int iommu_group_add_device(struct iommu_group *group, struct
device *dev)
 
 	dev->iommu_group = group;
 
-	iommu_group_create_direct_mappings(group, dev);
-
 	mutex_lock(&group->mutex);
 	list_add_tail(&device->list, &group->devices);
 	if (group->domain)
@@ -1736,6 +1743,7 @@ static void probe_alloc_default_domain(struct bus_type
*bus,
 		gtype.type = iommu_def_domain_type;
 
 	iommu_group_alloc_default_domain(bus, group, gtype.type);
+
 }
 
 static int iommu_group_do_dma_attach(struct device *dev, void *data)
@@ -1760,6 +1768,21 @@ static int __iommu_group_dma_attach(struct iommu_group
*group)
 					  iommu_group_do_dma_attach);
 }
 
+static int iommu_do_create_direct_mappings(struct device *dev, void *data)
+{
+	struct iommu_group *group = data;
+
+	iommu_create_device_direct_mappings(group, dev);
+
+	return 0;
+}
+
+static int iommu_group_create_direct_mappings(struct iommu_group *group)
+{
+	return __iommu_group_for_each_dev(group, group,
+					  iommu_do_create_direct_mappings);
+}
+
 static int bus_iommu_probe(struct bus_type *bus)
 {
 	const struct iommu_ops *ops = bus->iommu_ops;
@@ -1792,6 +1815,8 @@ static int bus_iommu_probe(struct bus_type *bus)
 				continue;
 			}
 
+			iommu_group_create_direct_mappings(group);
+
 			ret = __iommu_group_dma_attach(group);
 
 			mutex_unlock(&group->mutex);
@@ -2632,7 +2657,7 @@ request_default_domain_for_dev(struct device *dev,
unsigned long type)
 		iommu_domain_free(group->default_domain);
 	group->default_domain = domain;
 
-	iommu_group_create_direct_mappings(group, dev);
+	iommu_create_device_direct_mappings(group, dev);
 
 	dev_info(dev, "Using iommu %s mapping\n",
 		 type == IOMMU_DOMAIN_DMA ? "dma" : "direct");
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Add a check to the bus_iommu_probe() call-path to make sure it ignores
devices which have already been successfully probed. Then export the
bus_iommu_probe() function so it can be used by IOMMU drivers.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 6 +++++-
 include/linux/iommu.h | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 834a45da0ed0..a2ff95424044 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1615,6 +1615,10 @@ static int probe_iommu_group(struct device *dev, void
*data)
 	if (!dev_iommu_get(dev))
 		return -ENOMEM;
 
+	/* Device is probed already if in a group */
+	if (iommu_group_get(dev) != NULL)
+		return 0;
+
 	if (!try_module_get(ops->owner)) {
 		ret = -EINVAL;
 		goto err_free_dev_iommu;
@@ -1783,7 +1787,7 @@ static int iommu_group_create_direct_mappings(struct
iommu_group *group)
 					  iommu_do_create_direct_mappings);
 }
 
-static int bus_iommu_probe(struct bus_type *bus)
+int bus_iommu_probe(struct bus_type *bus)
 {
 	const struct iommu_ops *ops = bus->iommu_ops;
 	int ret;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 30170d191e5e..fea1622408ad 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -445,6 +445,7 @@ static inline void iommu_iotlb_gather_init(struct
iommu_iotlb_gather *gather)
 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER	6 /* Post Driver unbind */
 
 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
+extern int bus_iommu_probe(struct bus_type *bus);
 extern bool iommu_present(struct bus_type *bus);
 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Make use of generic IOMMU infrastructure to gather the same information
carried in dev_data->passthrough and remove the struct member.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/amd_iommu.c       | 10 +++++-----
 drivers/iommu/amd_iommu_types.h |  1 -
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 3e0d27f7622e..0b4b4faa876d 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2047,8 +2047,8 @@ static int pdev_iommuv2_enable(struct pci_dev *pdev)
 static int attach_device(struct device *dev,
 			 struct protection_domain *domain)
 {
-	struct pci_dev *pdev;
 	struct iommu_dev_data *dev_data;
+	struct pci_dev *pdev;
 	unsigned long flags;
 	int ret;
 
@@ -2067,8 +2067,10 @@ static int attach_device(struct device *dev,
 
 	pdev = to_pci_dev(dev);
 	if (domain->flags & PD_IOMMUV2_MASK) {
+		struct iommu_domain *def_domain = iommu_get_dma_domain(dev);
+
 		ret = -EINVAL;
-		if (!dev_data->passthrough)
+		if (def_domain->type != IOMMU_DOMAIN_IDENTITY)
 			goto out;
 
 		if (dev_data->iommu_v2) {
@@ -2189,9 +2191,7 @@ static int amd_iommu_add_device(struct device *dev)
 
 	/* Domains are initialized for this device - have a look what we ended up with
*/
 	domain = iommu_get_domain_for_dev(dev);
-	if (domain->type == IOMMU_DOMAIN_IDENTITY)
-		dev_data->passthrough = true;
-	else if (domain->type == IOMMU_DOMAIN_DMA)
+	if (domain->type == IOMMU_DOMAIN_DMA)
 		iommu_setup_dma_ops(dev, IOVA_START_PFN << PAGE_SHIFT, 0);
 
 out:
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index ca8c4522045b..d0d7b6a0c3d8 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -640,7 +640,6 @@ struct iommu_dev_data {
 	struct pci_dev *pdev;
 	u16 devid;			  /* PCI Device ID */
 	bool iommu_v2;			  /* Device can make use of IOMMUv2 */
-	bool passthrough;		  /* Device is identity mapped */
 	struct {
 		bool enabled;
 		int qdep;
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the AMD IOMMU Driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/amd_iommu.c | 71 ++++++++++++---------------------------
 1 file changed, 22 insertions(+), 49 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 0b4b4faa876d..c30367413683 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -343,21 +343,9 @@ static bool check_device(struct device *dev)
 	return true;
 }
 
-static void init_iommu_group(struct device *dev)
-{
-	struct iommu_group *group;
-
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return;
-
-	iommu_group_put(group);
-}
-
 static int iommu_init_device(struct device *dev)
 {
 	struct iommu_dev_data *dev_data;
-	struct amd_iommu *iommu;
 	int devid;
 
 	if (dev->archdata.iommu)
@@ -367,8 +355,6 @@ static int iommu_init_device(struct device *dev)
 	if (devid < 0)
 		return devid;
 
-	iommu = amd_iommu_rlookup_table[devid];
-
 	dev_data = find_dev_data(devid);
 	if (!dev_data)
 		return -ENOMEM;
@@ -391,8 +377,6 @@ static int iommu_init_device(struct device *dev)
 
 	dev->archdata.iommu = dev_data;
 
-	iommu_device_link(&iommu->iommu, dev);
-
 	return 0;
 }
 
@@ -410,7 +394,7 @@ static void iommu_ignore_device(struct device *dev)
 	setup_aliases(dev);
 }
 
-static void iommu_uninit_device(struct device *dev)
+static void amd_iommu_uninit_device(struct device *dev)
 {
 	struct iommu_dev_data *dev_data;
 	struct amd_iommu *iommu;
@@ -429,13 +413,6 @@ static void iommu_uninit_device(struct device *dev)
 	if (dev_data->domain)
 		detach_device(dev);
 
-	iommu_device_unlink(&iommu->iommu, dev);
-
-	iommu_group_remove_device(dev);
-
-	/* Remove dma-ops */
-	dev->dma_ops = NULL;
-
 	/*
 	 * We keep dev_data around for unplugged devices and reuse it when the
 	 * device is re-plugged - not doing so would introduce a ton of races.
@@ -2152,55 +2129,50 @@ static void detach_device(struct device *dev)
 	spin_unlock_irqrestore(&domain->lock, flags);
 }
 
-static int amd_iommu_add_device(struct device *dev)
+static struct iommu_device *amd_iommu_probe_device(struct device *dev)
 {
-	struct iommu_dev_data *dev_data;
-	struct iommu_domain *domain;
+	struct iommu_device *iommu_dev;
 	struct amd_iommu *iommu;
 	int ret, devid;
 
-	if (get_dev_data(dev))
-		return 0;
-
 	if (!check_device(dev))
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	devid = get_device_id(dev);
 	if (devid < 0)
-		return devid;
+		return ERR_PTR(devid);
 
 	iommu = amd_iommu_rlookup_table[devid];
 
+	if (get_dev_data(dev))
+		return &iommu->iommu;
+
 	ret = iommu_init_device(dev);
 	if (ret) {
 		if (ret != -ENOTSUPP)
 			dev_err(dev, "Failed to initialize - trying to proceed anyway\n");
-
+		iommu_dev = ERR_PTR(ret);
 		iommu_ignore_device(dev);
-		dev->dma_ops = NULL;
-		goto out;
+	} else {
+		iommu_dev = &iommu->iommu;
 	}
-	init_iommu_group(dev);
 
-	dev_data = get_dev_data(dev);
+	iommu_completion_wait(iommu);
 
-	BUG_ON(!dev_data);
+	return iommu_dev;
+}
 
-	if (dev_data->iommu_v2)
-		iommu_request_dm_for_dev(dev);
+static void amd_iommu_probe_finalize(struct device *dev)
+{
+	struct iommu_domain *domain;
 
 	/* Domains are initialized for this device - have a look what we ended up with
*/
 	domain = iommu_get_domain_for_dev(dev);
 	if (domain->type == IOMMU_DOMAIN_DMA)
 		iommu_setup_dma_ops(dev, IOVA_START_PFN << PAGE_SHIFT, 0);
-
-out:
-	iommu_completion_wait(iommu);
-
-	return 0;
 }
 
-static void amd_iommu_remove_device(struct device *dev)
+static void amd_iommu_release_device(struct device *dev)
 {
 	struct amd_iommu *iommu;
 	int devid;
@@ -2214,7 +2186,7 @@ static void amd_iommu_remove_device(struct device *dev)
 
 	iommu = amd_iommu_rlookup_table[devid];
 
-	iommu_uninit_device(dev);
+	amd_iommu_uninit_device(dev);
 	iommu_completion_wait(iommu);
 }
 
@@ -2687,8 +2659,9 @@ const struct iommu_ops amd_iommu_ops = {
 	.map = amd_iommu_map,
 	.unmap = amd_iommu_unmap,
 	.iova_to_phys = amd_iommu_iova_to_phys,
-	.add_device = amd_iommu_add_device,
-	.remove_device = amd_iommu_remove_device,
+	.probe_device = amd_iommu_probe_device,
+	.release_device = amd_iommu_release_device,
+	.probe_finalize = amd_iommu_probe_finalize,
 	.device_group = amd_iommu_device_group,
 	.domain_get_attr = amd_iommu_domain_get_attr,
 	.get_resv_regions = amd_iommu_get_resv_regions,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Intel IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/intel-iommu.c | 67 ++++---------------------------------
 1 file changed, 6 insertions(+), 61 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b9f905a55dda..b906727f5b85 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5781,78 +5781,27 @@ static bool intel_iommu_capable(enum iommu_cap cap)
 	return false;
 }
 
-static int intel_iommu_add_device(struct device *dev)
+static struct iommu_device *intel_iommu_probe_device(struct device *dev)
 {
-	struct dmar_domain *dmar_domain;
-	struct iommu_domain *domain;
 	struct intel_iommu *iommu;
-	struct iommu_group *group;
 	u8 bus, devfn;
-	int ret;
 
 	iommu = device_to_iommu(dev, &bus, &devfn);
 	if (!iommu)
-		return -ENODEV;
-
-	iommu_device_link(&iommu->iommu, dev);
+		return ERR_PTR(-ENODEV);
 
 	if (translation_pre_enabled(iommu))
 		dev->archdata.iommu = DEFER_DEVICE_DOMAIN_INFO;
 
-	group = iommu_group_get_for_dev(dev);
-
-	if (IS_ERR(group)) {
-		ret = PTR_ERR(group);
-		goto unlink;
-	}
-
-	iommu_group_put(group);
-
-	domain = iommu_get_domain_for_dev(dev);
-	dmar_domain = to_dmar_domain(domain);
-	if (domain->type == IOMMU_DOMAIN_DMA) {
-		if (device_def_domain_type(dev) == IOMMU_DOMAIN_IDENTITY) {
-			ret = iommu_request_dm_for_dev(dev);
-			if (ret) {
-				dmar_remove_one_dev_info(dev);
-				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
-				domain_add_dev_info(si_domain, dev);
-				dev_info(dev,
-					 "Device uses a private identity domain.\n");
-			}
-		}
-	} else {
-		if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) {
-			ret = iommu_request_dma_domain_for_dev(dev);
-			if (ret) {
-				dmar_remove_one_dev_info(dev);
-				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
-				if (!get_private_domain_for_dev(dev)) {
-					dev_warn(dev,
-						 "Failed to get a private domain.\n");
-					ret = -ENOMEM;
-					goto unlink;
-				}
-
-				dev_info(dev,
-					 "Device uses a private dma domain.\n");
-			}
-		}
-	}
-
 	if (device_needs_bounce(dev)) {
 		dev_info(dev, "Use Intel IOMMU bounce page dma_ops\n");
 		set_dma_ops(dev, &bounce_dma_ops);
 	}
 
-	return 0;
-
-unlink:
-	iommu_device_unlink(&iommu->iommu, dev);
-	return ret;
+	return &iommu->iommu;
 }
 
-static void intel_iommu_remove_device(struct device *dev)
+static void intel_iommu_release_device(struct device *dev)
 {
 	struct intel_iommu *iommu;
 	u8 bus, devfn;
@@ -5863,10 +5812,6 @@ static void intel_iommu_remove_device(struct device *dev)
 
 	dmar_remove_one_dev_info(dev);
 
-	iommu_group_remove_device(dev);
-
-	iommu_device_unlink(&iommu->iommu, dev);
-
 	if (device_needs_bounce(dev))
 		set_dma_ops(dev, NULL);
 }
@@ -6198,8 +6143,8 @@ const struct iommu_ops intel_iommu_ops = {
 	.map			= intel_iommu_map,
 	.unmap			= intel_iommu_unmap,
 	.iova_to_phys		= intel_iommu_iova_to_phys,
-	.add_device		= intel_iommu_add_device,
-	.remove_device		= intel_iommu_remove_device,
+	.probe_device		= intel_iommu_probe_device,
+	.release_device		= intel_iommu_release_device,
 	.get_resv_regions	= intel_iommu_get_resv_regions,
 	.put_resv_regions	= generic_iommu_put_resv_regions,
 	.apply_resv_region	= intel_iommu_apply_resv_region,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the arm-smmu and arm-smmu-v3 drivers to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code does the
group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/arm-smmu-v3.c | 38 ++++++++++--------------------------
 drivers/iommu/arm-smmu.c    | 39 ++++++++++++++-----------------------
 2 files changed, 25 insertions(+), 52 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 82508730feb7..42e1ee7e5197 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2914,27 +2914,26 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device
*smmu, u32 sid)
 
 static struct iommu_ops arm_smmu_ops;
 
-static int arm_smmu_add_device(struct device *dev)
+static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 {
 	int i, ret;
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_master *master;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct iommu_group *group;
 
 	if (!fwspec || fwspec->ops != &arm_smmu_ops)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	if (WARN_ON_ONCE(dev_iommu_priv_get(dev)))
-		return -EBUSY;
+		return ERR_PTR(-EBUSY);
 
 	smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
 	if (!smmu)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	master = kzalloc(sizeof(*master), GFP_KERNEL);
 	if (!master)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	master->dev = dev;
 	master->smmu = smmu;
@@ -2975,30 +2974,15 @@ static int arm_smmu_add_device(struct device *dev)
 		master->ssid_bits = min_t(u8, master->ssid_bits,
 					  CTXDESC_LINEAR_CDMAX);
 
-	ret = iommu_device_link(&smmu->iommu, dev);
-	if (ret)
-		goto err_disable_pasid;
+	return &smmu->iommu;
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group)) {
-		ret = PTR_ERR(group);
-		goto err_unlink;
-	}
-
-	iommu_group_put(group);
-	return 0;
-
-err_unlink:
-	iommu_device_unlink(&smmu->iommu, dev);
-err_disable_pasid:
-	arm_smmu_disable_pasid(master);
 err_free_master:
 	kfree(master);
 	dev_iommu_priv_set(dev, NULL);
-	return ret;
+	return ERR_PTR(ret);
 }
 
-static void arm_smmu_remove_device(struct device *dev)
+static void arm_smmu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_master *master;
@@ -3010,8 +2994,6 @@ static void arm_smmu_remove_device(struct device *dev)
 	master = dev_iommu_priv_get(dev);
 	smmu = master->smmu;
 	arm_smmu_detach_dev(master);
-	iommu_group_remove_device(dev);
-	iommu_device_unlink(&smmu->iommu, dev);
 	arm_smmu_disable_pasid(master);
 	kfree(master);
 	iommu_fwspec_free(dev);
@@ -3138,8 +3120,8 @@ static struct iommu_ops arm_smmu_ops = {
 	.flush_iotlb_all	= arm_smmu_flush_iotlb_all,
 	.iotlb_sync		= arm_smmu_iotlb_sync,
 	.iova_to_phys		= arm_smmu_iova_to_phys,
-	.add_device		= arm_smmu_add_device,
-	.remove_device		= arm_smmu_remove_device,
+	.probe_device		= arm_smmu_probe_device,
+	.release_device		= arm_smmu_release_device,
 	.device_group		= arm_smmu_device_group,
 	.domain_get_attr	= arm_smmu_domain_get_attr,
 	.domain_set_attr	= arm_smmu_domain_set_attr,
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index a6a5796e9c41..e622f4e33379 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -220,7 +220,7 @@ static int arm_smmu_register_legacy_master(struct device
*dev,
  * With the legacy DT binding in play, we have no guarantees about
  * probe order, but then we're also not doing default domains, so we can
  * delay setting bus ops until we're sure every possible SMMU is ready,
- * and that way ensure that no add_device() calls get missed.
+ * and that way ensure that no probe_device() calls get missed.
  */
 static int arm_smmu_legacy_bus_init(void)
 {
@@ -1062,7 +1062,6 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
 	struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
 	struct arm_smmu_device *smmu = cfg->smmu;
 	struct arm_smmu_smr *smrs = smmu->smrs;
-	struct iommu_group *group;
 	int i, idx, ret;
 
 	mutex_lock(&smmu->stream_map_mutex);
@@ -1090,18 +1089,9 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
 		cfg->smendx[i] = (s16)idx;
 	}
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group)) {
-		ret = PTR_ERR(group);
-		goto out_err;
-	}
-	iommu_group_put(group);
-
 	/* It worked! Now, poke the actual hardware */
-	for_each_cfg_sme(cfg, fwspec, i, idx) {
+	for_each_cfg_sme(cfg, fwspec, i, idx)
 		arm_smmu_write_sme(smmu, idx);
-		smmu->s2crs[idx].group = group;
-	}
 
 	mutex_unlock(&smmu->stream_map_mutex);
 	return 0;
@@ -1172,7 +1162,7 @@ static int arm_smmu_attach_dev(struct iommu_domain
*domain, struct device *dev)
 
 	/*
 	 * FIXME: The arch/arm DMA API code tries to attach devices to its own
-	 * domains between of_xlate() and add_device() - we have no way to cope
+	 * domains between of_xlate() and probe_device() - we have no way to cope
 	 * with that, so until ARM gets converted to rely on groups and default
 	 * domains, just say no (but more politely than by dereferencing NULL).
 	 * This should be at least a WARN_ON once that's sorted.
@@ -1382,7 +1372,7 @@ struct arm_smmu_device *arm_smmu_get_by_fwnode(struct
fwnode_handle *fwnode)
 	return dev ? dev_get_drvdata(dev) : NULL;
 }
 
-static int arm_smmu_add_device(struct device *dev)
+static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 {
 	struct arm_smmu_device *smmu = NULL;
 	struct arm_smmu_master_cfg *cfg;
@@ -1403,7 +1393,7 @@ static int arm_smmu_add_device(struct device *dev)
 	} else if (fwspec && fwspec->ops == &arm_smmu_ops) {
 		smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
 	} else {
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 	}
 
 	ret = -EINVAL;
@@ -1444,21 +1434,19 @@ static int arm_smmu_add_device(struct device *dev)
 	if (ret)
 		goto out_cfg_free;
 
-	iommu_device_link(&smmu->iommu, dev);
-
 	device_link_add(dev, smmu->dev,
 			DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
 
-	return 0;
+	return &smmu->iommu;
 
 out_cfg_free:
 	kfree(cfg);
 out_free:
 	iommu_fwspec_free(dev);
-	return ret;
+	return ERR_PTR(ret);
 }
 
-static void arm_smmu_remove_device(struct device *dev)
+static void arm_smmu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_master_cfg *cfg;
@@ -1475,13 +1463,11 @@ static void arm_smmu_remove_device(struct device *dev)
 	if (ret < 0)
 		return;
 
-	iommu_device_unlink(&smmu->iommu, dev);
 	arm_smmu_master_free_smes(cfg, fwspec);
 
 	arm_smmu_rpm_put(smmu);
 
 	dev_iommu_priv_set(dev, NULL);
-	iommu_group_remove_device(dev);
 	kfree(cfg);
 	iommu_fwspec_free(dev);
 }
@@ -1512,6 +1498,11 @@ static struct iommu_group *arm_smmu_device_group(struct
device *dev)
 	else
 		group = generic_device_group(dev);
 
+	/* Remember group for faster lookups */
+	if (!IS_ERR(group))
+		for_each_cfg_sme(cfg, fwspec, i, idx)
+			smmu->s2crs[idx].group = group;
+
 	return group;
 }
 
@@ -1628,8 +1619,8 @@ static struct iommu_ops arm_smmu_ops = {
 	.flush_iotlb_all	= arm_smmu_flush_iotlb_all,
 	.iotlb_sync		= arm_smmu_iotlb_sync,
 	.iova_to_phys		= arm_smmu_iova_to_phys,
-	.add_device		= arm_smmu_add_device,
-	.remove_device		= arm_smmu_remove_device,
+	.probe_device		= arm_smmu_probe_device,
+	.release_device		= arm_smmu_release_device,
 	.device_group		= arm_smmu_device_group,
 	.domain_get_attr	= arm_smmu_domain_get_attr,
 	.domain_set_attr	= arm_smmu_domain_set_attr,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the PAMU IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/fsl_pamu_domain.c | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 06828e2698d5..928d37771ece 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -1016,25 +1016,13 @@ static struct iommu_group *fsl_pamu_device_group(struct
device *dev)
 	return group;
 }
 
-static int fsl_pamu_add_device(struct device *dev)
+static struct iommu_device *fsl_pamu_probe_device(struct device *dev)
 {
-	struct iommu_group *group;
-
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-
-	iommu_device_link(&pamu_iommu, dev);
-
-	return 0;
+	return &pamu_iommu;
 }
 
-static void fsl_pamu_remove_device(struct device *dev)
+static void fsl_pamu_release_device(struct device *dev)
 {
-	iommu_device_unlink(&pamu_iommu, dev);
-	iommu_group_remove_device(dev);
 }
 
 static const struct iommu_ops fsl_pamu_ops = {
@@ -1048,8 +1036,8 @@ static const struct iommu_ops fsl_pamu_ops = {
 	.iova_to_phys	= fsl_pamu_iova_to_phys,
 	.domain_set_attr = fsl_pamu_set_domain_attr,
 	.domain_get_attr = fsl_pamu_get_domain_attr,
-	.add_device	= fsl_pamu_add_device,
-	.remove_device	= fsl_pamu_remove_device,
+	.probe_device	= fsl_pamu_probe_device,
+	.release_device	= fsl_pamu_release_device,
 	.device_group   = fsl_pamu_device_group,
 };
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the S390 IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/s390-iommu.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 1137f3ddcb85..610f0828f22d 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -166,21 +166,14 @@ static void s390_iommu_detach_device(struct iommu_domain
*domain,
 	}
 }
 
-static int s390_iommu_add_device(struct device *dev)
+static struct iommu_device *s390_iommu_probe_device(struct device *dev)
 {
-	struct iommu_group *group = iommu_group_get_for_dev(dev);
 	struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
 
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-	iommu_device_link(&zdev->iommu_dev, dev);
-
-	return 0;
+	return &zdev->iommu_dev;
 }
 
-static void s390_iommu_remove_device(struct device *dev)
+static void s390_iommu_release_device(struct device *dev)
 {
 	struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
 	struct iommu_domain *domain;
@@ -191,7 +184,7 @@ static void s390_iommu_remove_device(struct device *dev)
 	 * to vfio-pci and completing the VFIO_SET_IOMMU ioctl (which triggers
 	 * the attach_dev), removing the device via
 	 * "echo 1 > /sys/bus/pci/devices/.../remove" won't trigger
detach_dev,
-	 * only remove_device will be called via the BUS_NOTIFY_REMOVED_DEVICE
+	 * only release_device will be called via the BUS_NOTIFY_REMOVED_DEVICE
 	 * notifier.
 	 *
 	 * So let's call detach_dev from here if it hasn't been called before.
@@ -201,9 +194,6 @@ static void s390_iommu_remove_device(struct device *dev)
 		if (domain)
 			s390_iommu_detach_device(domain, dev);
 	}
-
-	iommu_device_unlink(&zdev->iommu_dev, dev);
-	iommu_group_remove_device(dev);
 }
 
 static int s390_iommu_update_trans(struct s390_domain *s390_domain,
@@ -373,8 +363,8 @@ static const struct iommu_ops s390_iommu_ops = {
 	.map = s390_iommu_map,
 	.unmap = s390_iommu_unmap,
 	.iova_to_phys = s390_iommu_iova_to_phys,
-	.add_device = s390_iommu_add_device,
-	.remove_device = s390_iommu_remove_device,
+	.probe_device = s390_iommu_probe_device,
+	.release_device = s390_iommu_release_device,
 	.device_group = generic_device_group,
 	.pgsize_bitmap = S390_IOMMU_PGSIZES,
 };
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the VirtIO IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/virtio-iommu.c | 41 +++++++++---------------------------
 1 file changed, 10 insertions(+), 31 deletions(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index d5cac4f46ca5..bda300c2a438 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -865,24 +865,23 @@ static struct viommu_dev *viommu_get_by_fwnode(struct
fwnode_handle *fwnode)
 	return dev ? dev_to_virtio(dev)->priv : NULL;
 }
 
-static int viommu_add_device(struct device *dev)
+static struct iommu_device *viommu_probe_device(struct device *dev)
 {
 	int ret;
-	struct iommu_group *group;
 	struct viommu_endpoint *vdev;
 	struct viommu_dev *viommu = NULL;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 
 	if (!fwspec || fwspec->ops != &viommu_ops)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	viommu = viommu_get_by_fwnode(fwspec->iommu_fwnode);
 	if (!viommu)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 	if (!vdev)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	vdev->dev = dev;
 	vdev->viommu = viommu;
@@ -896,45 +895,25 @@ static int viommu_add_device(struct device *dev)
 			goto err_free_dev;
 	}
 
-	ret = iommu_device_link(&viommu->iommu, dev);
-	if (ret)
-		goto err_free_dev;
+	return &viommu->iommu;
 
-	/*
-	 * Last step creates a default domain and attaches to it. Everything
-	 * must be ready.
-	 */
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group)) {
-		ret = PTR_ERR(group);
-		goto err_unlink_dev;
-	}
-
-	iommu_group_put(group);
-
-	return PTR_ERR_OR_ZERO(group);
-
-err_unlink_dev:
-	iommu_device_unlink(&viommu->iommu, dev);
 err_free_dev:
 	generic_iommu_put_resv_regions(dev, &vdev->resv_regions);
 	kfree(vdev);
 
-	return ret;
+	return ERR_PTR(ret);
 }
 
-static void viommu_remove_device(struct device *dev)
+static void viommu_release_device(struct device *dev)
 {
-	struct viommu_endpoint *vdev;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	struct viommu_endpoint *vdev;
 
 	if (!fwspec || fwspec->ops != &viommu_ops)
 		return;
 
 	vdev = dev_iommu_priv_get(dev);
 
-	iommu_group_remove_device(dev);
-	iommu_device_unlink(&vdev->viommu->iommu, dev);
 	generic_iommu_put_resv_regions(dev, &vdev->resv_regions);
 	kfree(vdev);
 }
@@ -960,8 +939,8 @@ static struct iommu_ops viommu_ops = {
 	.unmap			= viommu_unmap,
 	.iova_to_phys		= viommu_iova_to_phys,
 	.iotlb_sync		= viommu_iotlb_sync,
-	.add_device		= viommu_add_device,
-	.remove_device		= viommu_remove_device,
+	.probe_device		= viommu_probe_device,
+	.release_device		= viommu_release_device,
 	.device_group		= viommu_device_group,
 	.get_resv_regions	= viommu_get_resv_regions,
 	.put_resv_regions	= generic_iommu_put_resv_regions,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the MSM IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/msm_iommu.c | 34 +++++++---------------------------
 1 file changed, 7 insertions(+), 27 deletions(-)

diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 94a6df1bddd6..10cd4db0710a 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -388,43 +388,23 @@ static struct msm_iommu_dev *find_iommu_for_dev(struct
device *dev)
 	return ret;
 }
 
-static int msm_iommu_add_device(struct device *dev)
+static struct iommu_device *msm_iommu_probe_device(struct device *dev)
 {
 	struct msm_iommu_dev *iommu;
-	struct iommu_group *group;
 	unsigned long flags;
 
 	spin_lock_irqsave(&msm_iommu_lock, flags);
 	iommu = find_iommu_for_dev(dev);
 	spin_unlock_irqrestore(&msm_iommu_lock, flags);
 
-	if (iommu)
-		iommu_device_link(&iommu->iommu, dev);
-	else
-		return -ENODEV;
-
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
+	if (!iommu)
+		return ERR_PTR(-ENODEV);
 
-	return 0;
+	return &iommu->iommu;
 }
 
-static void msm_iommu_remove_device(struct device *dev)
+static void msm_iommu_release_device(struct device *dev)
 {
-	struct msm_iommu_dev *iommu;
-	unsigned long flags;
-
-	spin_lock_irqsave(&msm_iommu_lock, flags);
-	iommu = find_iommu_for_dev(dev);
-	spin_unlock_irqrestore(&msm_iommu_lock, flags);
-
-	if (iommu)
-		iommu_device_unlink(&iommu->iommu, dev);
-
-	iommu_group_remove_device(dev);
 }
 
 static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device
*dev)
@@ -708,8 +688,8 @@ static struct iommu_ops msm_iommu_ops = {
 	 */
 	.iotlb_sync = NULL,
 	.iova_to_phys = msm_iommu_iova_to_phys,
-	.add_device = msm_iommu_add_device,
-	.remove_device = msm_iommu_remove_device,
+	.probe_device = msm_iommu_probe_device,
+	.release_device = msm_iommu_release_device,
 	.device_group = generic_device_group,
 	.pgsize_bitmap = MSM_IOMMU_PGSIZES,
 	.of_xlate = qcom_iommu_of_xlate,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Mediatek IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/mtk_iommu.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 5f4d6df59cf6..2be96f1cdbd2 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -441,38 +441,26 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct
iommu_domain *domain,
 	return pa;
 }
 
-static int mtk_iommu_add_device(struct device *dev)
+static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_data *data;
-	struct iommu_group *group;
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
-		return -ENODEV; /* Not a iommu client device */
+		return ERR_PTR(-ENODEV); /* Not a iommu client device */
 
 	data = dev_iommu_priv_get(dev);
-	iommu_device_link(&data->iommu, dev);
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-	return 0;
+	return &data->iommu;
 }
 
-static void mtk_iommu_remove_device(struct device *dev)
+static void mtk_iommu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct mtk_iommu_data *data;
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
 		return;
 
-	data = dev_iommu_priv_get(dev);
-	iommu_device_unlink(&data->iommu, dev);
-
-	iommu_group_remove_device(dev);
 	iommu_fwspec_free(dev);
 }
 
@@ -526,8 +514,8 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.flush_iotlb_all = mtk_iommu_flush_iotlb_all,
 	.iotlb_sync	= mtk_iommu_iotlb_sync,
 	.iova_to_phys	= mtk_iommu_iova_to_phys,
-	.add_device	= mtk_iommu_add_device,
-	.remove_device	= mtk_iommu_remove_device,
+	.probe_device	= mtk_iommu_probe_device,
+	.release_device	= mtk_iommu_release_device,
 	.device_group	= mtk_iommu_device_group,
 	.of_xlate	= mtk_iommu_of_xlate,
 	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Mediatek-v1 IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/mtk_iommu_v1.c | 50 +++++++++++++++---------------------
 1 file changed, 20 insertions(+), 30 deletions(-)

diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index a31be05601c9..7bdd74c7cb9f 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -416,14 +416,12 @@ static int mtk_iommu_create_mapping(struct device *dev,
 	return 0;
 }
 
-static int mtk_iommu_add_device(struct device *dev)
+static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct dma_iommu_mapping *mtk_mapping;
 	struct of_phandle_args iommu_spec;
 	struct of_phandle_iterator it;
 	struct mtk_iommu_data *data;
-	struct iommu_group *group;
 	int err;
 
 	of_for_each_phandle(&it, err, dev->of_node, "iommus",
@@ -442,35 +440,28 @@ static int mtk_iommu_add_device(struct device *dev)
 	}
 
 	if (!fwspec || fwspec->ops != &mtk_iommu_ops)
-		return -ENODEV; /* Not a iommu client device */
+		return ERR_PTR(-ENODEV); /* Not a iommu client device */
 
-	/*
-	 * This is a short-term bodge because the ARM DMA code doesn't
-	 * understand multi-device groups, but we have to call into it
-	 * successfully (and not just rely on a normal IOMMU API attach
-	 * here) in order to set the correct DMA API ops on @dev.
-	 */
-	group = iommu_group_alloc();
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+	data = dev_iommu_priv_get(dev);
 
-	err = iommu_group_add_device(group, dev);
-	iommu_group_put(group);
-	if (err)
-		return err;
+	return &data->iommu;
+}
 
-	data = dev_iommu_priv_get(dev);
+static void mtk_iommu_probe_finalize(struct device *dev)
+{
+	struct dma_iommu_mapping *mtk_mapping;
+	struct mtk_iommu_data *data;
+	int err;
+
+	data        = dev_iommu_priv_get(dev);
 	mtk_mapping = data->dev->archdata.iommu;
-	err = arm_iommu_attach_device(dev, mtk_mapping);
-	if (err) {
-		iommu_group_remove_device(dev);
-		return err;
-	}
 
-	return iommu_device_link(&data->iommu, dev);
+	err = arm_iommu_attach_device(dev, mtk_mapping);
+	if (err)
+		dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not
work\n");
 }
 
-static void mtk_iommu_remove_device(struct device *dev)
+static void mtk_iommu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_data *data;
@@ -479,9 +470,6 @@ static void mtk_iommu_remove_device(struct device *dev)
 		return;
 
 	data = dev_iommu_priv_get(dev);
-	iommu_device_unlink(&data->iommu, dev);
-
-	iommu_group_remove_device(dev);
 	iommu_fwspec_free(dev);
 }
 
@@ -534,8 +522,10 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.map		= mtk_iommu_map,
 	.unmap		= mtk_iommu_unmap,
 	.iova_to_phys	= mtk_iommu_iova_to_phys,
-	.add_device	= mtk_iommu_add_device,
-	.remove_device	= mtk_iommu_remove_device,
+	.probe_device	= mtk_iommu_probe_device,
+	.probe_finalize = mtk_iommu_probe_finalize,
+	.release_device	= mtk_iommu_release_device,
+	.device_group	= generic_device_group,
 	.pgsize_bitmap	= ~0UL << MT2701_IOMMU_PAGE_SHIFT,
 };
 
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the QCOM IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/qcom_iommu.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index 0e2a96467767..054e476ebd49 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -524,14 +524,13 @@ static bool qcom_iommu_capable(enum iommu_cap cap)
 	}
 }
 
-static int qcom_iommu_add_device(struct device *dev)
+static struct iommu_device *qcom_iommu_probe_device(struct device *dev)
 {
 	struct qcom_iommu_dev *qcom_iommu = to_iommu(dev);
-	struct iommu_group *group;
 	struct device_link *link;
 
 	if (!qcom_iommu)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	/*
 	 * Establish the link between iommu and master, so that the
@@ -542,28 +541,19 @@ static int qcom_iommu_add_device(struct device *dev)
 	if (!link) {
 		dev_err(qcom_iommu->dev, "Unable to create device link between %s and
%s\n",
 			dev_name(qcom_iommu->dev), dev_name(dev));
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 	}
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
-	iommu_device_link(&qcom_iommu->iommu, dev);
-
-	return 0;
+	return &qcom_iommu->iommu;
 }
 
-static void qcom_iommu_remove_device(struct device *dev)
+static void qcom_iommu_release_device(struct device *dev)
 {
 	struct qcom_iommu_dev *qcom_iommu = to_iommu(dev);
 
 	if (!qcom_iommu)
 		return;
 
-	iommu_device_unlink(&qcom_iommu->iommu, dev);
-	iommu_group_remove_device(dev);
 	iommu_fwspec_free(dev);
 }
 
@@ -619,8 +609,8 @@ static const struct iommu_ops qcom_iommu_ops = {
 	.flush_iotlb_all = qcom_iommu_flush_iotlb_all,
 	.iotlb_sync	= qcom_iommu_iotlb_sync,
 	.iova_to_phys	= qcom_iommu_iova_to_phys,
-	.add_device	= qcom_iommu_add_device,
-	.remove_device	= qcom_iommu_remove_device,
+	.probe_device	= qcom_iommu_probe_device,
+	.release_device	= qcom_iommu_release_device,
 	.device_group	= generic_device_group,
 	.of_xlate	= qcom_iommu_of_xlate,
 	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Rockchip IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/rockchip-iommu.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index b33cdd5aad81..d25c2486ca07 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1054,40 +1054,28 @@ static void rk_iommu_domain_free(struct iommu_domain
*domain)
 	kfree(rk_domain);
 }
 
-static int rk_iommu_add_device(struct device *dev)
+static struct iommu_device *rk_iommu_probe_device(struct device *dev)
 {
-	struct iommu_group *group;
-	struct rk_iommu *iommu;
 	struct rk_iommudata *data;
+	struct rk_iommu *iommu;
 
 	data = dev->archdata.iommu;
 	if (!data)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	iommu = rk_iommu_from_dev(dev);
 
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-	iommu_group_put(group);
-
-	iommu_device_link(&iommu->iommu, dev);
 	data->link = device_link_add(dev, iommu->dev,
 				     DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
 
-	return 0;
+	return &iommu->iommu;
 }
 
-static void rk_iommu_remove_device(struct device *dev)
+static void rk_iommu_release_device(struct device *dev)
 {
-	struct rk_iommu *iommu;
 	struct rk_iommudata *data = dev->archdata.iommu;
 
-	iommu = rk_iommu_from_dev(dev);
-
 	device_link_del(data->link);
-	iommu_device_unlink(&iommu->iommu, dev);
-	iommu_group_remove_device(dev);
 }
 
 static struct iommu_group *rk_iommu_device_group(struct device *dev)
@@ -1126,8 +1114,8 @@ static const struct iommu_ops rk_iommu_ops = {
 	.detach_dev = rk_iommu_detach_device,
 	.map = rk_iommu_map,
 	.unmap = rk_iommu_unmap,
-	.add_device = rk_iommu_add_device,
-	.remove_device = rk_iommu_remove_device,
+	.probe_device = rk_iommu_probe_device,
+	.release_device = rk_iommu_release_device,
 	.iova_to_phys = rk_iommu_iova_to_phys,
 	.device_group = rk_iommu_device_group,
 	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Tegra IOMMU drivers to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/tegra-gart.c | 24 ++++++------------------
 drivers/iommu/tegra-smmu.c | 31 ++++++++-----------------------
 2 files changed, 14 insertions(+), 41 deletions(-)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index db6559e8336f..5fbdff6ff41a 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -243,28 +243,16 @@ static bool gart_iommu_capable(enum iommu_cap cap)
 	return false;
 }
 
-static int gart_iommu_add_device(struct device *dev)
+static struct iommu_device *gart_iommu_probe_device(struct device *dev)
 {
-	struct iommu_group *group;
-
 	if (!dev_iommu_fwspec_get(dev))
-		return -ENODEV;
-
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
+		return ERR_PTR(-ENODEV);
 
-	iommu_device_link(&gart_handle->iommu, dev);
-
-	return 0;
+	return &gart_handle->iommu;
 }
 
-static void gart_iommu_remove_device(struct device *dev)
+static void gart_iommu_release_device(struct device *dev)
 {
-	iommu_group_remove_device(dev);
-	iommu_device_unlink(&gart_handle->iommu, dev);
 }
 
 static int gart_iommu_of_xlate(struct device *dev,
@@ -290,8 +278,8 @@ static const struct iommu_ops gart_iommu_ops = {
 	.domain_free	= gart_iommu_domain_free,
 	.attach_dev	= gart_iommu_attach_dev,
 	.detach_dev	= gart_iommu_detach_dev,
-	.add_device	= gart_iommu_add_device,
-	.remove_device	= gart_iommu_remove_device,
+	.probe_device	= gart_iommu_probe_device,
+	.release_device	= gart_iommu_release_device,
 	.device_group	= generic_device_group,
 	.map		= gart_iommu_map,
 	.unmap		= gart_iommu_unmap,
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 63a147b623e6..7426b7666e2b 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -757,11 +757,10 @@ static int tegra_smmu_configure(struct tegra_smmu *smmu,
struct device *dev,
 	return 0;
 }
 
-static int tegra_smmu_add_device(struct device *dev)
+static struct iommu_device *tegra_smmu_probe_device(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct tegra_smmu *smmu = NULL;
-	struct iommu_group *group;
 	struct of_phandle_args args;
 	unsigned int index = 0;
 	int err;
@@ -774,7 +773,7 @@ static int tegra_smmu_add_device(struct device *dev)
 			of_node_put(args.np);
 
 			if (err < 0)
-				return err;
+				return ERR_PTR(err);
 
 			/*
 			 * Only a single IOMMU master interface is currently
@@ -783,8 +782,6 @@ static int tegra_smmu_add_device(struct device *dev)
 			 */
 			dev->archdata.iommu = smmu;
 
-			iommu_device_link(&smmu->iommu, dev);
-
 			break;
 		}
 
@@ -793,26 +790,14 @@ static int tegra_smmu_add_device(struct device *dev)
 	}
 
 	if (!smmu)
-		return -ENODEV;
-
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
-
-	iommu_group_put(group);
+		return ERR_PTR(-ENODEV);
 
-	return 0;
+	return &smmu->iommu;
 }
 
-static void tegra_smmu_remove_device(struct device *dev)
+static void tegra_smmu_release_device(struct device *dev)
 {
-	struct tegra_smmu *smmu = dev->archdata.iommu;
-
-	if (smmu)
-		iommu_device_unlink(&smmu->iommu, dev);
-
 	dev->archdata.iommu = NULL;
-	iommu_group_remove_device(dev);
 }
 
 static const struct tegra_smmu_group_soc *
@@ -895,8 +880,8 @@ static const struct iommu_ops tegra_smmu_ops = {
 	.domain_free = tegra_smmu_domain_free,
 	.attach_dev = tegra_smmu_attach_dev,
 	.detach_dev = tegra_smmu_detach_dev,
-	.add_device = tegra_smmu_add_device,
-	.remove_device = tegra_smmu_remove_device,
+	.probe_device = tegra_smmu_probe_device,
+	.release_device = tegra_smmu_release_device,
 	.device_group = tegra_smmu_device_group,
 	.map = tegra_smmu_map,
 	.unmap = tegra_smmu_unmap,
@@ -1015,7 +1000,7 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 	 * value. However the IOMMU registration process will attempt to add
 	 * all devices to the IOMMU when bus_set_iommu() is called. In order
 	 * not to rely on global variables to track the IOMMU instance, we
-	 * set it here so that it can be looked up from the .add_device()
+	 * set it here so that it can be looked up from the .probe_device()
 	 * callback via the IOMMU device's .drvdata field.
 	 */
 	mc->smmu = smmu;
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Renesas IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/ipmmu-vmsa.c | 60 +++++++++++++-------------------------
 1 file changed, 20 insertions(+), 40 deletions(-)

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 310cf09feea3..fb7e702dee23 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -805,24 +805,8 @@ static int ipmmu_of_xlate(struct device *dev,
 static int ipmmu_init_arm_mapping(struct device *dev)
 {
 	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
-	struct iommu_group *group;
 	int ret;
 
-	/* Create a device group and add the device to it. */
-	group = iommu_group_alloc();
-	if (IS_ERR(group)) {
-		dev_err(dev, "Failed to allocate IOMMU group\n");
-		return PTR_ERR(group);
-	}
-
-	ret = iommu_group_add_device(group, dev);
-	iommu_group_put(group);
-
-	if (ret < 0) {
-		dev_err(dev, "Failed to add device to IPMMU group\n");
-		return ret;
-	}
-
 	/*
 	 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
 	 * VAs. This will allocate a corresponding IOMMU domain.
@@ -856,48 +840,39 @@ static int ipmmu_init_arm_mapping(struct device *dev)
 	return 0;
 
 error:
-	iommu_group_remove_device(dev);
 	if (mmu->mapping)
 		arm_iommu_release_mapping(mmu->mapping);
 
 	return ret;
 }
 
-static int ipmmu_add_device(struct device *dev)
+static struct iommu_device *ipmmu_probe_device(struct device *dev)
 {
 	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
-	struct iommu_group *group;
-	int ret;
 
 	/*
 	 * Only let through devices that have been verified in xlate()
 	 */
 	if (!mmu)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
-	if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA)) {
-		ret = ipmmu_init_arm_mapping(dev);
-		if (ret)
-			return ret;
-	} else {
-		group = iommu_group_get_for_dev(dev);
-		if (IS_ERR(group))
-			return PTR_ERR(group);
+	return &mmu->iommu;
+}
 
-		iommu_group_put(group);
-	}
+static void ipmmu_probe_finalize(struct device *dev)
+{
+	int ret = 0;
 
-	iommu_device_link(&mmu->iommu, dev);
-	return 0;
+	if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA))
+		ret = ipmmu_init_arm_mapping(dev);
+
+	if (ret)
+		dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not
work\n");
 }
 
-static void ipmmu_remove_device(struct device *dev)
+static void ipmmu_release_device(struct device *dev)
 {
-	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
-
-	iommu_device_unlink(&mmu->iommu, dev);
 	arm_iommu_detach_device(dev);
-	iommu_group_remove_device(dev);
 }
 
 static struct iommu_group *ipmmu_find_group(struct device *dev)
@@ -925,9 +900,14 @@ static const struct iommu_ops ipmmu_ops = {
 	.flush_iotlb_all = ipmmu_flush_iotlb_all,
 	.iotlb_sync = ipmmu_iotlb_sync,
 	.iova_to_phys = ipmmu_iova_to_phys,
-	.add_device = ipmmu_add_device,
-	.remove_device = ipmmu_remove_device,
+	.probe_device = ipmmu_probe_device,
+	.release_device = ipmmu_release_device,
+	.probe_finalize = ipmmu_probe_finalize,
+#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
+	.device_group = generic_device_group,
+#else
 	.device_group = ipmmu_find_group,
+#endif
 	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
 	.of_xlate = ipmmu_of_xlate,
 };
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Remove the tracking of device which could not be probed because
their IOMMU is not probed yet. Replace it with a call to
bus_iommu_probe() when a new IOMMU is probed.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/omap-iommu.c | 54 +++-----------------------------------
 1 file changed, 4 insertions(+), 50 deletions(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 887fefcb03b4..ecc9d0829a91 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -35,15 +35,6 @@
 
 static const struct iommu_ops omap_iommu_ops;
 
-struct orphan_dev {
-	struct device *dev;
-	struct list_head node;
-};
-
-static LIST_HEAD(orphan_dev_list);
-
-static DEFINE_SPINLOCK(orphan_lock);
-
 #define to_iommu(dev)	((struct omap_iommu *)dev_get_drvdata(dev))
 
 /* bitmap of the page sizes currently supported */
@@ -62,8 +53,6 @@ static DEFINE_SPINLOCK(orphan_lock);
 static struct platform_driver omap_iommu_driver;
 static struct kmem_cache *iopte_cachep;
 
-static int _omap_iommu_add_device(struct device *dev);
-
 /**
  * to_omap_domain - Get struct omap_iommu_domain from generic iommu_domain
  * @dom:	generic iommu domain handle
@@ -1177,7 +1166,6 @@ static int omap_iommu_probe(struct platform_device *pdev)
 	struct omap_iommu *obj;
 	struct resource *res;
 	struct device_node *of = pdev->dev.of_node;
-	struct orphan_dev *orphan_dev, *tmp;
 
 	if (!of) {
 		pr_err("%s: only DT-based devices are supported\n", __func__);
@@ -1260,13 +1248,8 @@ static int omap_iommu_probe(struct platform_device *pdev)
 
 	dev_info(&pdev->dev, "%s registered\n", obj->name);
 
-	list_for_each_entry_safe(orphan_dev, tmp, &orphan_dev_list, node) {
-		err = _omap_iommu_add_device(orphan_dev->dev);
-		if (!err) {
-			list_del(&orphan_dev->node);
-			kfree(orphan_dev);
-		}
-	}
+	/* Re-probe bus to probe device attached to this IOMMU */
+	bus_iommu_probe(&platform_bus_type);
 
 	return 0;
 
@@ -1657,7 +1640,7 @@ static phys_addr_t omap_iommu_iova_to_phys(struct
iommu_domain *domain,
 	return ret;
 }
 
-static int _omap_iommu_add_device(struct device *dev)
+static int omap_iommu_add_device(struct device *dev)
 {
 	struct omap_iommu_arch_data *arch_data, *tmp;
 	struct omap_iommu *oiommu;
@@ -1666,8 +1649,6 @@ static int _omap_iommu_add_device(struct device *dev)
 	struct platform_device *pdev;
 	int num_iommus, i;
 	int ret;
-	struct orphan_dev *orphan_dev;
-	unsigned long flags;
 
 	/*
 	 * Allocate the archdata iommu structure for DT-based devices.
@@ -1702,23 +1683,7 @@ static int _omap_iommu_add_device(struct device *dev)
 		if (!pdev) {
 			of_node_put(np);
 			kfree(arch_data);
-			spin_lock_irqsave(&orphan_lock, flags);
-			list_for_each_entry(orphan_dev, &orphan_dev_list,
-					    node) {
-				if (orphan_dev->dev == dev)
-					break;
-			}
-			spin_unlock_irqrestore(&orphan_lock, flags);
-
-			if (orphan_dev && orphan_dev->dev == dev)
-				return -EPROBE_DEFER;
-
-			orphan_dev = kzalloc(sizeof(*orphan_dev), GFP_KERNEL);
-			orphan_dev->dev = dev;
-			spin_lock_irqsave(&orphan_lock, flags);
-			list_add(&orphan_dev->node, &orphan_dev_list);
-			spin_unlock_irqrestore(&orphan_lock, flags);
-			return -EPROBE_DEFER;
+			return -ENODEV;
 		}
 
 		oiommu = platform_get_drvdata(pdev);
@@ -1764,17 +1729,6 @@ static int _omap_iommu_add_device(struct device *dev)
 	return 0;
 }
 
-static int omap_iommu_add_device(struct device *dev)
-{
-	int ret;
-
-	ret = _omap_iommu_add_device(dev);
-	if (ret == -EPROBE_DEFER)
-		return 0;
-
-	return ret;
-}
-
 static void omap_iommu_remove_device(struct device *dev)
 {
 	struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the OMAP IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/omap-iommu.c | 49 ++++++++++----------------------------
 1 file changed, 13 insertions(+), 36 deletions(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index ecc9d0829a91..6699fe6d9e06 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1640,15 +1640,13 @@ static phys_addr_t omap_iommu_iova_to_phys(struct
iommu_domain *domain,
 	return ret;
 }
 
-static int omap_iommu_add_device(struct device *dev)
+static struct iommu_device *omap_iommu_probe_device(struct device *dev)
 {
 	struct omap_iommu_arch_data *arch_data, *tmp;
+	struct platform_device *pdev;
 	struct omap_iommu *oiommu;
-	struct iommu_group *group;
 	struct device_node *np;
-	struct platform_device *pdev;
 	int num_iommus, i;
-	int ret;
 
 	/*
 	 * Allocate the archdata iommu structure for DT-based devices.
@@ -1657,7 +1655,7 @@ static int omap_iommu_add_device(struct device *dev)
 	 * IOMMU users.
 	 */
 	if (!dev->of_node)
-		return 0;
+		return ERR_PTR(-ENODEV);
 
 	/*
 	 * retrieve the count of IOMMU nodes using phandle size as element size
@@ -1670,27 +1668,27 @@ static int omap_iommu_add_device(struct device *dev)
 
 	arch_data = kcalloc(num_iommus + 1, sizeof(*arch_data), GFP_KERNEL);
 	if (!arch_data)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) {
 		np = of_parse_phandle(dev->of_node, "iommus", i);
 		if (!np) {
 			kfree(arch_data);
-			return -EINVAL;
+			return ERR_PTR(-EINVAL);
 		}
 
 		pdev = of_find_device_by_node(np);
 		if (!pdev) {
 			of_node_put(np);
 			kfree(arch_data);
-			return -ENODEV;
+			return ERR_PTR(-ENODEV);
 		}
 
 		oiommu = platform_get_drvdata(pdev);
 		if (!oiommu) {
 			of_node_put(np);
 			kfree(arch_data);
-			return -EINVAL;
+			return ERR_PTR(-EINVAL);
 		}
 
 		tmp->iommu_dev = oiommu;
@@ -1699,46 +1697,25 @@ static int omap_iommu_add_device(struct device *dev)
 		of_node_put(np);
 	}
 
+	dev->archdata.iommu = arch_data;
+
 	/*
 	 * use the first IOMMU alone for the sysfs device linking.
 	 * TODO: Evaluate if a single iommu_group needs to be
 	 * maintained for both IOMMUs
 	 */
 	oiommu = arch_data->iommu_dev;
-	ret = iommu_device_link(&oiommu->iommu, dev);
-	if (ret) {
-		kfree(arch_data);
-		return ret;
-	}
-
-	dev->archdata.iommu = arch_data;
-
-	/*
-	 * IOMMU group initialization calls into omap_iommu_device_group, which
-	 * needs a valid dev->archdata.iommu pointer
-	 */
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group)) {
-		iommu_device_unlink(&oiommu->iommu, dev);
-		dev->archdata.iommu = NULL;
-		kfree(arch_data);
-		return PTR_ERR(group);
-	}
-	iommu_group_put(group);
 
-	return 0;
+	return &oiommu->iommu;
 }
 
-static void omap_iommu_remove_device(struct device *dev)
+static void omap_iommu_release_device(struct device *dev)
 {
 	struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
 
 	if (!dev->of_node || !arch_data)
 		return;
 
-	iommu_device_unlink(&arch_data->iommu_dev->iommu, dev);
-	iommu_group_remove_device(dev);
-
 	dev->archdata.iommu = NULL;
 	kfree(arch_data);
 
@@ -1763,8 +1740,8 @@ static const struct iommu_ops omap_iommu_ops = {
 	.map		= omap_iommu_map,
 	.unmap		= omap_iommu_unmap,
 	.iova_to_phys	= omap_iommu_iova_to_phys,
-	.add_device	= omap_iommu_add_device,
-	.remove_device	= omap_iommu_remove_device,
+	.probe_device	= omap_iommu_probe_device,
+	.release_device	= omap_iommu_release_device,
 	.device_group	= omap_iommu_device_group,
 	.pgsize_bitmap	= OMAP_IOMMU_PGSIZES,
 };
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

On Exynos platforms there can be more than one SYSMMU (IOMMU) for one
DMA master device. Since the IOMMU core code expects only one hardware
IOMMU, use the first SYSMMU in the list.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/exynos-iommu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 186ff5cc975c..09cdd163560a 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1261,6 +1261,11 @@ static int exynos_iommu_add_device(struct device *dev)
 	}
 	iommu_group_put(group);
 
+	/* There is always at least one entry, see exynos_iommu_of_xlate() */
+	data = list_first_entry(&owner->controllers,
+				struct sysmmu_drvdata, owner_node);
+	iommu_device_link(&data->iommu, dev);
+
 	return 0;
 }
 
@@ -1286,6 +1291,11 @@ static void exynos_iommu_remove_device(struct device
*dev)
 
 	list_for_each_entry(data, &owner->controllers, owner_node)
 		device_link_del(data->link);
+
+	/* There is always at least one entry, see exynos_iommu_of_xlate() */
+	data = list_first_entry(&owner->controllers,
+				struct sysmmu_drvdata, owner_node);
+	iommu_device_unlink(&data->iommu, dev);
 }
 
 static int exynos_iommu_of_xlate(struct device *dev,
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

Convert the Exynos IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/exynos-iommu.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 09cdd163560a..60c8a56e4a3f 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1235,19 +1235,13 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct
iommu_domain *iommu_domain,
 	return phys;
 }
 
-static int exynos_iommu_add_device(struct device *dev)
+static struct iommu_device *exynos_iommu_probe_device(struct device *dev)
 {
 	struct exynos_iommu_owner *owner = dev->archdata.iommu;
 	struct sysmmu_drvdata *data;
-	struct iommu_group *group;
 
 	if (!has_sysmmu(dev))
-		return -ENODEV;
-
-	group = iommu_group_get_for_dev(dev);
-
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+		return ERR_PTR(-ENODEV);
 
 	list_for_each_entry(data, &owner->controllers, owner_node) {
 		/*
@@ -1259,17 +1253,15 @@ static int exynos_iommu_add_device(struct device *dev)
 					     DL_FLAG_STATELESS |
 					     DL_FLAG_PM_RUNTIME);
 	}
-	iommu_group_put(group);
 
 	/* There is always at least one entry, see exynos_iommu_of_xlate() */
 	data = list_first_entry(&owner->controllers,
 				struct sysmmu_drvdata, owner_node);
-	iommu_device_link(&data->iommu, dev);
 
-	return 0;
+	return &data->iommu;
 }
 
-static void exynos_iommu_remove_device(struct device *dev)
+static void exynos_iommu_release_device(struct device *dev)
 {
 	struct exynos_iommu_owner *owner = dev->archdata.iommu;
 	struct sysmmu_drvdata *data;
@@ -1287,15 +1279,9 @@ static void exynos_iommu_remove_device(struct device
*dev)
 			iommu_group_put(group);
 		}
 	}
-	iommu_group_remove_device(dev);
 
 	list_for_each_entry(data, &owner->controllers, owner_node)
 		device_link_del(data->link);
-
-	/* There is always at least one entry, see exynos_iommu_of_xlate() */
-	data = list_first_entry(&owner->controllers,
-				struct sysmmu_drvdata, owner_node);
-	iommu_device_unlink(&data->iommu, dev);
 }
 
 static int exynos_iommu_of_xlate(struct device *dev,
@@ -1341,8 +1327,8 @@ static const struct iommu_ops exynos_iommu_ops = {
 	.unmap = exynos_iommu_unmap,
 	.iova_to_phys = exynos_iommu_iova_to_phys,
 	.device_group = generic_device_group,
-	.add_device = exynos_iommu_add_device,
-	.remove_device = exynos_iommu_remove_device,
+	.probe_device = exynos_iommu_probe_device,
+	.release_device = exynos_iommu_release_device,
 	.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
 	.of_xlate = exynos_iommu_of_xlate,
 };
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

All drivers are converted to use the probe/release_device()
call-backs, so the add_device/remove_device() pointers are unused and
the code using them can be removed.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 149 ++++++++----------------------------------
 include/linux/iommu.h |   4 --
 2 files changed, 29 insertions(+), 124 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index a2ff95424044..9a7120746b8e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -220,7 +220,7 @@ static int __iommu_probe_device(struct device *dev, struct
list_head *group_list
 	return ret;
 }
 
-static int __iommu_probe_device_helper(struct device *dev)
+int iommu_probe_device(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	struct iommu_group *group;
@@ -264,70 +264,17 @@ static int __iommu_probe_device_helper(struct device *dev)
 
 }
 
-int iommu_probe_device(struct device *dev)
+void iommu_release_device(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
-	struct iommu_group *group;
-	int ret;
-
-	WARN_ON(dev->iommu_group);
-
-	if (!ops)
-		return -EINVAL;
-
-	if (!dev_iommu_get(dev))
-		return -ENOMEM;
-
-	if (!try_module_get(ops->owner)) {
-		ret = -EINVAL;
-		goto err_free_dev_param;
-	}
-
-	if (ops->probe_device)
-		return __iommu_probe_device_helper(dev);
-
-	ret = ops->add_device(dev);
-	if (ret)
-		goto err_module_put;
-
-	group = iommu_group_get(dev);
-	iommu_create_device_direct_mappings(group, dev);
-	iommu_group_put(group);
-
-	if (ops->probe_finalize)
-		ops->probe_finalize(dev);
 
-	return 0;
-
-err_module_put:
-	module_put(ops->owner);
-err_free_dev_param:
-	dev_iommu_free(dev);
-	return ret;
-}
-
-static void __iommu_release_device(struct device *dev)
-{
-	const struct iommu_ops *ops = dev->bus->iommu_ops;
+	if (!dev->iommu)
+		return;
 
 	iommu_device_unlink(dev->iommu->iommu_dev, dev);
-
 	iommu_group_remove_device(dev);
 
 	ops->release_device(dev);
-}
-
-void iommu_release_device(struct device *dev)
-{
-	const struct iommu_ops *ops = dev->bus->iommu_ops;
-
-	if (!dev->iommu)
-		return;
-
-	if (ops->release_device)
-		__iommu_release_device(dev);
-	else if (dev->iommu_group)
-		ops->remove_device(dev);
 
 	module_put(ops->owner);
 	dev_iommu_free(dev);
@@ -1560,23 +1507,6 @@ struct iommu_group *iommu_group_get_for_dev(struct device
*dev)
 	if (ret)
 		goto out_put_group;
 
-	/*
-	 * Try to allocate a default domain - needs support from the
-	 * IOMMU driver. There are still some drivers which don't support
-	 * default domains, so the return value is not yet checked. Only
-	 * allocate the domain here when the driver still has the
-	 * add_device/remove_device call-backs implemented.
-	 */
-	if (!ops->probe_device) {
-		iommu_alloc_default_domain(dev);
-
-		if (group->default_domain)
-			ret = __iommu_attach_device(group->default_domain, dev);
-
-		if (ret)
-			goto out_put_group;
-	}
-
 	return group;
 
 out_put_group:
@@ -1591,21 +1521,6 @@ struct iommu_domain *iommu_group_default_domain(struct
iommu_group *group)
 	return group->default_domain;
 }
 
-static int add_iommu_group(struct device *dev, void *data)
-{
-	int ret = iommu_probe_device(dev);
-
-	/*
-	 * We ignore -ENODEV errors for now, as they just mean that the
-	 * device is not translated by an IOMMU. We still care about
-	 * other errors and fail to initialize when they happen.
-	 */
-	if (ret == -ENODEV)
-		ret = 0;
-
-	return ret;
-}
-
 static int probe_iommu_group(struct device *dev, void *data)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
@@ -1789,47 +1704,41 @@ static int iommu_group_create_direct_mappings(struct
iommu_group *group)
 
 int bus_iommu_probe(struct bus_type *bus)
 {
-	const struct iommu_ops *ops = bus->iommu_ops;
+	struct iommu_group *group, *next;
+	LIST_HEAD(group_list);
 	int ret;
 
-	if (ops->probe_device) {
-		struct iommu_group *group, *next;
-		LIST_HEAD(group_list);
-
-		/*
-		 * This code-path does not allocate the default domain when
-		 * creating the iommu group, so do it after the groups are
-		 * created.
-		 */
-		ret = bus_for_each_dev(bus, NULL, &group_list, probe_iommu_group);
-		if (ret)
-			return ret;
+	/*
+	 * This code-path does not allocate the default domain when
+	 * creating the iommu group, so do it after the groups are
+	 * created.
+	 */
+	ret = bus_for_each_dev(bus, NULL, &group_list, probe_iommu_group);
+	if (ret)
+		return ret;
 
-		list_for_each_entry_safe(group, next, &group_list, entry) {
-			/* Remove item from the list */
-			list_del_init(&group->entry);
+	list_for_each_entry_safe(group, next, &group_list, entry) {
+		/* Remove item from the list */
+		list_del_init(&group->entry);
 
-			mutex_lock(&group->mutex);
+		mutex_lock(&group->mutex);
 
-			/* Try to allocate default domain */
-			probe_alloc_default_domain(bus, group);
+		/* Try to allocate default domain */
+		probe_alloc_default_domain(bus, group);
 
-			if (!group->default_domain) {
-				mutex_unlock(&group->mutex);
-				continue;
-			}
+		if (!group->default_domain) {
+			mutex_unlock(&group->mutex);
+			continue;
+		}
 
-			iommu_group_create_direct_mappings(group);
+		iommu_group_create_direct_mappings(group);
 
-			ret = __iommu_group_dma_attach(group);
+		ret = __iommu_group_dma_attach(group);
 
-			mutex_unlock(&group->mutex);
+		mutex_unlock(&group->mutex);
 
-			if (ret)
-				break;
-		}
-	} else {
-		ret = bus_for_each_dev(bus, NULL, NULL, add_iommu_group);
+		if (ret)
+			break;
 	}
 
 	return ret;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index fea1622408ad..dd076366383f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -223,8 +223,6 @@ struct iommu_iotlb_gather {
  * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
  *            queue
  * @iova_to_phys: translate iova to physical address
- * @add_device: add device to iommu grouping
- * @remove_device: remove device from iommu grouping
  * @probe_device: Add device to iommu driver handling
  * @release_device: Remove device from iommu driver handling
  * @probe_finalize: Do final setup work after the device is added to an IOMMU
@@ -277,8 +275,6 @@ struct iommu_ops {
 	void (*iotlb_sync)(struct iommu_domain *domain,
 			   struct iommu_iotlb_gather *iotlb_gather);
 	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
-	int (*add_device)(struct device *dev);
-	void (*remove_device)(struct device *dev);
 	struct iommu_device *(*probe_device)(struct device *dev);
 	void (*release_device)(struct device *dev);
 	void (*probe_finalize)(struct device *dev);
-- 
2.17.1

From: Joerg Roedel <jroedel at suse.de>

The function is now only used in IOMMU core code and shouldn't be used
outside of it anyway, so remove the export for it.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 drivers/iommu/iommu.c | 4 ++--
 include/linux/iommu.h | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 9a7120746b8e..e9413732c61e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -91,6 +91,7 @@ static void __iommu_detach_group(struct iommu_domain *domain,
 				 struct iommu_group *group);
 static int iommu_create_device_direct_mappings(struct iommu_group *group,
 					       struct device *dev);
+static struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 
 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store)		\
 struct iommu_group_attribute iommu_group_attr_##_name =		\
@@ -1483,7 +1484,7 @@ static int iommu_alloc_default_domain(struct device *dev)
  * to the returned IOMMU group, which will already include the provided
  * device.  The reference should be released with iommu_group_put().
  */
-struct iommu_group *iommu_group_get_for_dev(struct device *dev)
+static struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	struct iommu_group *group;
@@ -1514,7 +1515,6 @@ struct iommu_group *iommu_group_get_for_dev(struct device
*dev)
 
 	return ERR_PTR(ret);
 }
-EXPORT_SYMBOL(iommu_group_get_for_dev);
 
 struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
 {
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index dd076366383f..7cfd2dddb49d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -527,7 +527,6 @@ extern int iommu_page_response(struct device *dev,
 			       struct iommu_page_response *msg);
 
 extern int iommu_group_id(struct iommu_group *group);
-extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 
 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
-- 
2.17.1

Hi Baolu,

On Wed, Apr 15, 2020 at 02:10:03PM +0800, Lu Baolu
wrote:
> On 2020/4/14 21:15, Joerg Roedel wrote:
> > > +	/* Device is probed already if in a group */
> > +	if (iommu_group_get(dev) != NULL)
> 
> Same as
> 	if (iommu_group_get(dev))
> ?
> 
> By the way, do we need to put the group if device has already been
> probed?
Right, fixed both, thank you.


Regards,

	Joerg

On Wed, Apr 15, 2020 at 02:36:20PM +0800, Lu Baolu
wrote:
> On 2020/4/14 21:15, Joerg Roedel wrote:
> > From: Joerg Roedel<jroedel at suse.de>
> > 
> > Add call-backs to 'struct iommu_ops' as an alternative to the
> > add_device() and remove_device() call-backs, which will be removed
when
> > all drivers are converted.
> > 
> > The new call-backs will not setupt IOMMU groups and domains anymore,
> > so also add a probe_finalize() call-back where the IOMMU driver can do
> > per-device setup work which require the device to be set up with a
> > group and a domain.
> 
> The subject is inaccurate. probe_device() and release_device() are
> added to replace the add and remove pair.
This patch does not replace them yet, it just adds the new call-backs.
The removal of add_device()/remove_device() happens later in the
patch-set when all drivers are converted.

Regards,

	Joerg