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iommu/amd: Rearrange GCR3 table setup code

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Consolidate GCR3 table related code in one place so that its easy
to maintain.

Note that this patch doesn't move __set_gcr3/__clear_gcr3. We are moving
GCR3 table from per domain to per device. Following series will rework
these functions. During that time I will move these functions as well.

No functional changes intended.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240205115615.6053-9-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde 2024-02-05 11:56:06 +00:00 committed by Joerg Roedel
parent 474bf01ed9
commit b2e8a7f5d2
1 changed files with 32 additions and 32 deletions
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64
drivers/iommu/amd/iommu.c
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@ -1714,6 +1714,38 @@ static int setup_gcr3_table(struct protection_domain *domain, int pasids)
return 0;
}
static u64 *__get_gcr3_pte(u64 *root, int level, u32 pasid, bool alloc)
{
int index;
u64 *pte;
while (true) {
index = (pasid >> (9 * level)) & 0x1ff;
pte = &root[index];
if (level == 0)
break;
if (!(*pte & GCR3_VALID)) {
if (!alloc)
return NULL;
root = (void *)get_zeroed_page(GFP_ATOMIC);
if (root == NULL)
return NULL;
*pte = iommu_virt_to_phys(root) | GCR3_VALID;
}
root = iommu_phys_to_virt(*pte & PAGE_MASK);
level -= 1;
}
return pte;
}
static void set_dte_entry(struct amd_iommu *iommu,
struct iommu_dev_data *dev_data)
{
@ -2737,38 +2769,6 @@ int amd_iommu_flush_tlb(struct iommu_domain *dom, u32 pasid)
return ret;
}
static u64 *__get_gcr3_pte(u64 *root, int level, u32 pasid, bool alloc)
{
int index;
u64 *pte;
while (true) {
index = (pasid >> (9 * level)) & 0x1ff;
pte = &root[index];
if (level == 0)
break;
if (!(*pte & GCR3_VALID)) {
if (!alloc)
return NULL;
root = (void *)get_zeroed_page(GFP_ATOMIC);
if (root == NULL)
return NULL;
*pte = iommu_virt_to_phys(root) | GCR3_VALID;
}
root = iommu_phys_to_virt(*pte & PAGE_MASK);
level -= 1;
}
return pte;
}
static int __set_gcr3(struct protection_domain *domain, u32 pasid,
unsigned long cr3)
{