[PATCH v4 03/07] iommu/ipmmu-vmsa: Break out utlb parsing code

Magnus Damm
2016-06-08T07:28:34Z

Break out the utlb parsing code and dev_data allocation into a
separate function. This is preparation for future code sharing.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
---

Changes since V3:
- Initialize "mmu" to NULL, check before accessing
- Removed group parameter from ipmmu_init_platform_device()

Changes since V2:
- Included this new patch from the following series:
[PATCH 00/04] iommu/ipmmu-vmsa: IPMMU CONFIG_IOMMU_DMA update
- Reworked code to fit on top on previous two patches in current series.

drivers/iommu/ipmmu-vmsa.c | 60 +++++++++++++++++++++++++++-----------------
1 file changed, 38 insertions(+), 22 deletions(-)

--- 0004/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2016-06-08 14:59:34.470607110 +0900
@@ -647,22 +647,15 @@ static int ipmmu_find_utlbs(struct ipmmu
return 0;
}

-static int ipmmu_add_device(struct device *dev)
+static int ipmmu_init_platform_device(struct device *dev)
{
struct ipmmu_vmsa_archdata *archdata;
struct ipmmu_vmsa_device *mmu;
- struct iommu_group *group = NULL;
unsigned int *utlbs;
unsigned int i;
int num_utlbs;
int ret = -ENODEV;

- if (dev->archdata.iommu) {
- dev_warn(dev, "IOMMU driver already assigned to device %s\n",
- dev_name(dev));
- return -EINVAL;
- }
-
/* Find the master corresponding to the device. */

num_utlbs = of_count_phandle_with_args(dev->of_node, "iommus",
@@ -690,7 +683,7 @@ static int ipmmu_add_device(struct devic
spin_unlock(&ipmmu_devices_lock);

if (ret < 0)
- return -ENODEV;
+ goto error;

for (i = 0; i < num_utlbs; ++i) {
if (utlbs[i] >= mmu->num_utlbs) {
@@ -699,6 +692,36 @@ static int ipmmu_add_device(struct devic
}
}

+ archdata = kzalloc(sizeof(*archdata), GFP_KERNEL);
+ if (!archdata) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ archdata->mmu = mmu;
+ archdata->utlbs = utlbs;
+ archdata->num_utlbs = num_utlbs;
+ dev->archdata.iommu = archdata;
+ return 0;
+
+error:
+ kfree(utlbs);
+ return ret;
+}
+
+static int ipmmu_add_device(struct device *dev)
+{
+ struct ipmmu_vmsa_archdata *archdata;
+ struct ipmmu_vmsa_device *mmu = NULL;
+ struct iommu_group *group;
+ int ret;
+
+ if (dev->archdata.iommu) {
+ dev_warn(dev, "IOMMU driver already assigned to device %s\n",
+ dev_name(dev));
+ return -EINVAL;
+ }
+
/* Create a device group and add the device to it. */
group = iommu_group_alloc();
if (IS_ERR(group)) {
@@ -716,16 +739,9 @@ static int ipmmu_add_device(struct devic
goto error;
}

- archdata = kzalloc(sizeof(*archdata), GFP_KERNEL);
- if (!archdata) {
- ret = -ENOMEM;
+ ret = ipmmu_init_platform_device(dev);
+ if (ret < 0)
goto error;
- }
-
- archdata->mmu = mmu;
- archdata->utlbs = utlbs;
- archdata->num_utlbs = num_utlbs;
- dev->archdata.iommu = archdata;

/*
* Create the ARM mapping, used by the ARM DMA mapping core to allocate
@@ -736,6 +752,8 @@ static int ipmmu_add_device(struct devic
* - Make the mapping size configurable ? We currently use a 2GB mapping
* at a 1GB offset to ensure that NULL VAs will fault.
*/
+ archdata = dev->archdata.iommu;
+ mmu = archdata->mmu;
if (!mmu->mapping) {
struct dma_iommu_mapping *mapping;

@@ -760,10 +778,8 @@ static int ipmmu_add_device(struct devic
return 0;

error:
- arm_iommu_release_mapping(mmu->mapping);
-
- kfree(dev->archdata.iommu);
- kfree(utlbs);
+ if (mmu)
+ arm_iommu_release_mapping(mmu->mapping);

dev->archdata.iommu = NULL;