iommu: Add for_each_group_device()

Convenience macro to iterate over every struct group_device in the group.

Replace all open coded list_for_each_entry's with this macro.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v5-1b99ae392328+44574-iommu_err_unwind_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/.clang-format b/.clang-format
index 0d1ed87..0bbb199 100644 (file)
--- a/.clang-format
+++ b/.clang-format
@@ -254,6 +254,7 @@ ForEachMacros:
   - 'for_each_free_mem_range'
   - 'for_each_free_mem_range_reverse'
   - 'for_each_func_rsrc'
+  - 'for_each_group_device'
   - 'for_each_group_evsel'
   - 'for_each_group_member'
   - 'for_each_hstate'

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index aab956f..e806f4c 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -68,6 +68,10 @@ struct group_device {
        char *name;
 };
 
+/* Iterate over each struct group_device in a struct iommu_group */
+#define for_each_group_device(group, pos) \
+       list_for_each_entry(pos, &(group)->devices, list)
+
 struct iommu_group_attribute {
        struct attribute attr;
        ssize_t (*show)(struct iommu_group *group, char *buf);
@@ -468,7 +472,7 @@ __iommu_group_remove_device(struct iommu_group *group, struct device *dev)
        struct group_device *device;
 
        lockdep_assert_held(&group->mutex);
-       list_for_each_entry(device, &group->devices, list) {
+       for_each_group_device(group, device) {
                if (device->dev == dev) {
                        list_del(&device->list);
                        return device;
@@ -707,7 +711,7 @@ int iommu_get_group_resv_regions(struct iommu_group *group,
        int ret = 0;
 
        mutex_lock(&group->mutex);
-       list_for_each_entry(device, &group->devices, list) {
+       for_each_group_device(group, device) {
                struct list_head dev_resv_regions;
 
                /*
@@ -1131,7 +1135,7 @@ static int __iommu_group_for_each_dev(struct iommu_group *group, void *data,
        struct group_device *device;
        int ret = 0;
 
-       list_for_each_entry(device, &group->devices, list) {
+       for_each_group_device(group, device) {
                ret = fn(device->dev, data);
                if (ret)
                        break;
@@ -1935,7 +1939,7 @@ bool iommu_group_has_isolated_msi(struct iommu_group *group)
        bool ret = true;
 
        mutex_lock(&group->mutex);
-       list_for_each_entry(group_dev, &group->devices, list)
+       for_each_group_device(group, group_dev)
                ret &= msi_device_has_isolated_msi(group_dev->dev);
        mutex_unlock(&group->mutex);
        return ret;
@@ -3243,7 +3247,7 @@ static int __iommu_set_group_pasid(struct iommu_domain *domain,
        struct group_device *device;
        int ret = 0;
 
-       list_for_each_entry(device, &group->devices, list) {
+       for_each_group_device(group, device) {
                ret = domain->ops->set_dev_pasid(domain, device->dev, pasid);
                if (ret)
                        break;
@@ -3258,7 +3262,7 @@ static void __iommu_remove_group_pasid(struct iommu_group *group,
        struct group_device *device;
        const struct iommu_ops *ops;
 
-       list_for_each_entry(device, &group->devices, list) {
+       for_each_group_device(group, device) {
                ops = dev_iommu_ops(device->dev);
                ops->remove_dev_pasid(device->dev, pasid);
        }