Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-01 10:43:43 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

iommu/amd: Implement global identity domain

Browse Source 
Implement global identity domain. All device groups in identity domain
will share this domain.

In attach device path, based on device capability it will allocate per
device domain ID and GCR3 table. So that it can support SVA.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20241028093810.5901-11-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde 2024-10-28 09:38:08 +00:00 committed by Joerg Roedel
parent ce2cd17546
commit 4402f2627d
3 changed files with 36 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/iommu/amd/amd_iommu.h
View File

@ -46,6 +46,7 @@ extern int amd_iommu_gpt_level;
extern unsigned long amd_iommu_pgsize_bitmap;
/* Protection domain ops */
void amd_iommu_init_identity_domain(void);
struct protection_domain *protection_domain_alloc(unsigned int type, int nid);
void protection_domain_free(struct protection_domain *domain);
struct iommu_domain *amd_iommu_domain_alloc_sva(struct device *dev,

3
drivers/iommu/amd/init.c
View File

@ -2164,6 +2164,9 @@ static int __init amd_iommu_init_pci(void)
struct amd_iommu_pci_seg *pci_seg;
int ret;
/* Init global identity domain before registering IOMMU */
amd_iommu_init_identity_domain();
for_each_iommu(iommu) {
ret = iommu_init_pci(iommu);
if (ret) {

36
drivers/iommu/amd/iommu.c
View File

@ -74,6 +74,9 @@ struct kmem_cache *amd_iommu_irq_cache;
static void detach_device(struct device *dev);
static int amd_iommu_attach_device(struct iommu_domain *dom,
struct device *dev);
static void set_dte_entry(struct amd_iommu *iommu,
struct iommu_dev_data *dev_data);
@ -2263,6 +2266,14 @@ void protection_domain_free(struct protection_domain *domain)
kfree(domain);
}
static void protection_domain_init(struct protection_domain *domain, int nid)
{
spin_lock_init(&domain->lock);
INIT_LIST_HEAD(&domain->dev_list);
INIT_LIST_HEAD(&domain->dev_data_list);
domain->iop.pgtbl.cfg.amd.nid = nid;
}
struct protection_domain *protection_domain_alloc(unsigned int type, int nid)
{
struct protection_domain *domain;
@ -2277,10 +2288,7 @@ struct protection_domain *protection_domain_alloc(unsigned int type, int nid)
return NULL;
}
spin_lock_init(&domain->lock);
INIT_LIST_HEAD(&domain->dev_list);
INIT_LIST_HEAD(&domain->dev_data_list);
domain->iop.pgtbl.cfg.amd.nid = nid;
protection_domain_init(domain, nid);
return domain;
}
@ -2471,6 +2479,25 @@ static struct iommu_domain blocked_domain = {
}
};
static struct protection_domain identity_domain;
static const struct iommu_domain_ops identity_domain_ops = {
.attach_dev = amd_iommu_attach_device,
};
void amd_iommu_init_identity_domain(void)
{
struct iommu_domain *domain = &identity_domain.domain;
domain->type = IOMMU_DOMAIN_IDENTITY;
domain->ops = &identity_domain_ops;
domain->owner = &amd_iommu_ops;
identity_domain.id = domain_id_alloc();
protection_domain_init(&identity_domain, NUMA_NO_NODE);
}
static int amd_iommu_attach_device(struct iommu_domain *dom,
struct device *dev)
{
@ -2869,6 +2896,7 @@ static int amd_iommu_dev_disable_feature(struct device *dev,
const struct iommu_ops amd_iommu_ops = {
.capable = amd_iommu_capable,
.blocked_domain = &blocked_domain,
.identity_domain = &identity_domain.domain,
.domain_alloc = amd_iommu_domain_alloc,
.domain_alloc_user = amd_iommu_domain_alloc_user,
.domain_alloc_sva = amd_iommu_domain_alloc_sva,