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powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper

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Creates a helper to allow allocating a new iommu_table without the need
to reallocate the iommu_group.

This will be helpful for replacing the iommu_table for the new DMA window,
after we remove the old one with iommu_tce_table_put().

Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210817063929.38701-4-leobras.c@gmail.com
This commit is contained in:
Leonardo Bras 2021-08-17 03:39:21 -03:00 committed by Michael Ellerman
parent 3c33066a21
commit 4ff8677a0b
1 changed files with 14 additions and 11 deletions
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25
arch/powerpc/platforms/pseries/iommu.c
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@ -53,28 +53,31 @@ enum {
DDW_EXT_QUERY_OUT_SIZE = 2
};
static struct iommu_table_group *iommu_pseries_alloc_group(int node)
static struct iommu_table *iommu_pseries_alloc_table(int node)
{
struct iommu_table_group *table_group;
struct iommu_table *tbl;
table_group = kzalloc_node(sizeof(struct iommu_table_group), GFP_KERNEL,
node);
if (!table_group)
return NULL;
tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, node);
if (!tbl)
goto free_group;
return NULL;
INIT_LIST_HEAD_RCU(&tbl->it_group_list);
kref_init(&tbl->it_kref);
return tbl;
}
table_group->tables[0] = tbl;
static struct iommu_table_group *iommu_pseries_alloc_group(int node)
{
struct iommu_table_group *table_group;
return table_group;
table_group = kzalloc_node(sizeof(*table_group), GFP_KERNEL, node);
if (!table_group)
return NULL;
table_group->tables[0] = iommu_pseries_alloc_table(node);
if (table_group->tables[0])
return table_group;
free_group:
kfree(table_group);
return NULL;
}