iommu_take_ownership/iommu_release_ownership used to be used to mark
bits in iommu_table::it_map. Since the IOMMU tables are recreated for
VFIO, it_map is always NULL.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
arch/powerpc/include/asm/iommu.h | 2 -
arch/powerpc/kernel/iommu.c | 96 ----------------------------------------
2 files changed, 98 deletions(-)
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 8393822..33009f9 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -272,8 +272,6 @@ extern long iommu_tce_xchg(struct iommu_table *tbl,
unsigned long entry,
enum dma_data_direction direction);
extern void iommu_flush_tce(struct iommu_table *tbl);
-extern int iommu_take_ownership(struct powerpc_iommu *iommu);
-extern void iommu_release_ownership(struct powerpc_iommu *iommu);
#endif /* __KERNEL__ */
#endif /* _ASM_IOMMU_H */
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 5f87076..6987115 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1007,102 +1007,6 @@ long iommu_tce_xchg(struct iommu_table *tbl, unsigned
long entry,
}
EXPORT_SYMBOL_GPL(iommu_tce_xchg);
-static int iommu_table_take_ownership(struct iommu_table *tbl)
-{
- unsigned long flags, i, sz = (tbl->it_size + 7) >> 3;
- int ret = 0;
-
- /*
- * VFIO does not control TCE entries allocation and the guest
- * can write new TCEs on top of existing ones so iommu_tce_build()
- * must be able to release old pages. This functionality
- * requires exchange() callback defined so if it is not
- * implemented, we disallow taking ownership over the table.
- */
- if (!tbl->it_ops->exchange)
- return -EINVAL;
-
- spin_lock_irqsave(&tbl->large_pool.lock, flags);
- for (i = 0; i < tbl->nr_pools; i++)
- spin_lock(&tbl->pools[i].lock);
-
- if (tbl->it_offset == 0)
- clear_bit(0, tbl->it_map);
-
- if (!bitmap_empty(tbl->it_map, tbl->it_size)) {
- pr_err("iommu_tce: it_map is not empty");
- ret = -EBUSY;
- if (tbl->it_offset == 0)
- set_bit(0, tbl->it_map);
- } else {
- memset(tbl->it_map, 0xff, sz);
- }
-
- for (i = 0; i < tbl->nr_pools; i++)
- spin_unlock(&tbl->pools[i].lock);
- spin_unlock_irqrestore(&tbl->large_pool.lock, flags);
-
- return 0;
-}
-
-static void iommu_table_release_ownership(struct iommu_table *tbl);
-
-int iommu_take_ownership(struct powerpc_iommu *iommu)
-{
- int i, j, rc = 0;
-
- for (i = 0; i < POWERPC_IOMMU_MAX_TABLES; ++i) {
- struct iommu_table *tbl = &iommu->tables[i];
-
- if (!tbl->it_map)
- continue;
-
- rc = iommu_table_take_ownership(tbl);
- if (rc) {
- for (j = 0; j < i; ++j)
- iommu_table_release_ownership(
- &iommu->tables[j]);
-
- return rc;
- }
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(iommu_take_ownership);
-
-static void iommu_table_release_ownership(struct iommu_table *tbl)
-{
- unsigned long flags, i, sz = (tbl->it_size + 7) >> 3;
-
- spin_lock_irqsave(&tbl->large_pool.lock, flags);
- for (i = 0; i < tbl->nr_pools; i++)
- spin_lock(&tbl->pools[i].lock);
-
- memset(tbl->it_map, 0, sz);
-
- /* Restore bit#0 set by iommu_init_table() */
- if (tbl->it_offset == 0)
- set_bit(0, tbl->it_map);
-
- for (i = 0; i < tbl->nr_pools; i++)
- spin_unlock(&tbl->pools[i].lock);
- spin_unlock_irqrestore(&tbl->large_pool.lock, flags);
-}
-
-extern void iommu_release_ownership(struct powerpc_iommu *iommu)
-{
- int i;
-
- for (i = 0; i < POWERPC_IOMMU_MAX_TABLES; ++i) {
- struct iommu_table *tbl = &iommu->tables[i];
-
- if (tbl->it_map)
- iommu_table_release_ownership(tbl);
- }
-}
-EXPORT_SYMBOL_GPL(iommu_release_ownership);
-
int iommu_add_device(struct device *dev)
{
struct iommu_table *tbl;
--
2.0.0
--
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