[PATCH v3 15/34] iommu/amd: Convert to probe/release_device() call-backs

Joerg Roedel
2020-04-29T13:38:31Z

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@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,