mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

powerpc: iommu: Bring back table group release_ownership() call 

The commit 2ad56efa80 ("powerpc/iommu: Setup a default domain and
remove set_platform_dma_ops") refactored the code removing the
set_platform_dma_ops(). It missed out the table group
release_ownership() call which would have got called otherwise
during the guest shutdown via vfio_group_detach_container(). On
PPC64, this particular call actually sets up the 32-bit TCE table,
and enables the 64-bit DMA bypass etc. Now after guest shutdown,
the subsequent host driver (e.g megaraid-sas) probe post unbind
from vfio-pci fails like,

megaraid_sas 0031:01:00.0: Warning: IOMMU dma not supported: mask 0x7fffffffffffffff, table unavailable
megaraid_sas 0031:01:00.0: Warning: IOMMU dma not supported: mask 0xffffffff, table unavailable
megaraid_sas 0031:01:00.0: Failed to set DMA mask
megaraid_sas 0031:01:00.0: Failed from megasas_init_fw 6539

The patch brings back the call to table_group release_ownership()
call when switching back to PLATFORM domain from BLOCKED, while
also separates the domain_ops for both.

Fixes: 2ad56efa80 ("powerpc/iommu: Setup a default domain and remove set_platform_dma_ops")
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/170628173462.3742.18330000394415935845.stgit@ltcd48-lp2.aus.stglab.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Shivaprasad G Bhat 2024-01-26 09:09:18 -06:00 committed by Joerg Roedel
parent fae6e669cd
commit d2d00e1580
1 changed files with 28 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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)