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iommu/arm-smmu: Convert to probe/release_device() call-backs

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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@suse.de>
Link: https://lore.kernel.org/r/20200429133712.31431-18-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-04-29 15:36:55 +02:00
parent e5d1841f18
commit cefa0d55da
2 changed files with 25 additions and 52 deletions
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38
drivers/iommu/arm-smmu-v3.c
View File

@ -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,

39
drivers/iommu/arm-smmu.c
View File

@ -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,