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IOMMU Fixes for Linux v6.8-rc2

Browse source 
Including:
 
 	- Make iommu_ops->default_domain work without CONFIG_IOMMU_DMA to fix
 	  initialization of FSL-PAMU devices
 
 	- Fix for Tegra fbdev initialization failure
 
 	- Fix for a VFIO device unbinding failure on PowerPC
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Merge tag 'iommu-fixes-v6.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pul iommu fixes from Joerg Roedel:

 - Make iommu_ops->default_domain work without CONFIG_IOMMU_DMA to fix
   initialization of FSL-PAMU devices

 - Fix for Tegra fbdev initialization failure

 - Fix for a VFIO device unbinding failure on PowerPC

* tag 'iommu-fixes-v6.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  powerpc: iommu: Bring back table group release_ownership() call
  drm/tegra: Do not assume that a NULL domain means no DMA IOMMU
  iommu: Allow ops->default_domain to work when !CONFIG_IOMMU_DMA
This commit is contained in:
Linus Torvalds 2024-02-02 12:43:51 -08:00
parent 6897cea718 d2d00e1580
commit 4f18d3fd29
3 changed files with 43 additions and 15 deletions
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37
arch/powerpc/kernel/iommu.c
View file

@ -1287,20 +1287,20 @@ spapr_tce_platform_iommu_attach_dev(struct iommu_domain *platform_domain,
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
struct iommu_group *grp = iommu_group_get(dev);
struct iommu_table_group *table_group;
int ret = -EINVAL;
/* At first attach the ownership is already set */
if (!domain)
return 0;
if (!grp)
return -ENODEV;
table_group = iommu_group_get_iommudata(grp);
ret = table_group->ops->take_ownership(table_group);
/*
* The domain being set to PLATFORM from earlier
* BLOCKED. The table_group ownership has to be released.
*/
table_group->ops->release_ownership(table_group);
iommu_group_put(grp);
return ret;
return 0;
}
static const struct iommu_domain_ops spapr_tce_platform_domain_ops = {
@ -1312,13 +1312,32 @@ static struct iommu_domain spapr_tce_platform_domain = {
.ops = &spapr_tce_platform_domain_ops,
};
static struct iommu_domain spapr_tce_blocked_domain = {
.type = IOMMU_DOMAIN_BLOCKED,
static int
spapr_tce_blocked_iommu_attach_dev(struct iommu_domain *platform_domain,
struct device *dev)
{
struct iommu_group *grp = iommu_group_get(dev);
struct iommu_table_group *table_group;
int ret = -EINVAL;
/*
* FIXME: SPAPR mixes blocked and platform behaviors, the blocked domain
* also sets the dma_api ops
*/
.ops = &spapr_tce_platform_domain_ops,
table_group = iommu_group_get_iommudata(grp);
ret = table_group->ops->take_ownership(table_group);
iommu_group_put(grp);
return ret;
}
static const struct iommu_domain_ops spapr_tce_blocked_domain_ops = {
.attach_dev = spapr_tce_blocked_iommu_attach_dev,
};
static struct iommu_domain spapr_tce_blocked_domain = {
.type = IOMMU_DOMAIN_BLOCKED,
.ops = &spapr_tce_blocked_domain_ops,
};
static bool spapr_tce_iommu_capable(struct device *dev, enum iommu_cap cap)

3
drivers/gpu/drm/tegra/drm.c
View file

@ -960,7 +960,8 @@ int host1x_client_iommu_attach(struct host1x_client *client)
* not the shared IOMMU domain, don't try to attach it to a different
* domain. This allows using the IOMMU-backed DMA API.
*/
if (domain && domain != tegra->domain)
if (domain && domain->type != IOMMU_DOMAIN_IDENTITY &&
domain != tegra->domain)
return 0;
if (tegra->domain) {

18
drivers/iommu/iommu.c
View file

@ -1799,7 +1799,7 @@ iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
* domain. Do not use in new drivers.
*/
if (ops->default_domain) {
if (req_type)
if (req_type != ops->default_domain->type)
return ERR_PTR(-EINVAL);
return ops->default_domain;
}
@ -1871,10 +1871,18 @@ static int iommu_get_def_domain_type(struct iommu_group *group,
const struct iommu_ops *ops = dev_iommu_ops(dev);
int type;
if (!ops->def_domain_type)
return cur_type;
type = ops->def_domain_type(dev);
if (ops->default_domain) {
/*
* Drivers that declare a global static default_domain will
* always choose that.
*/
type = ops->default_domain->type;
} else {
if (ops->def_domain_type)
type = ops->def_domain_type(dev);
else
return cur_type;
}
if (!type || cur_type == type)
return cur_type;
if (!cur_type)