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powerpc/pseries: Enable VFIO 

This enables VFIO on pseries host in order to allow VFIO in nested guest under
PR KVM or DPDK in a HV guest. This adds support of the VFIO_SPAPR_TCE_IOMMU
type.

This adds exchange() callback to allow TCE updates by the SPAPR TCE IOMMU
driver in VFIO.

This initializes DMA32 window parameters in iommu_table_group as as this does
not implement VFIO_SPAPR_TCE_v2_IOMMU and VFIO_SPAPR_TCE_IOMMU just reuses the
existing DMA32 window.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy 2017-03-24 17:37:21 +11:00 committed by Michael Ellerman
parent e49a6a2173
commit b6e1f6adce
1 changed files with 38 additions and 2 deletions
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40
arch/powerpc/platforms/pseries/iommu.c
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@ -551,6 +551,7 @@ static void iommu_table_setparms(struct pci_controller *phb,
static void iommu_table_setparms_lpar(struct pci_controller *phb,
struct device_node *dn,
struct iommu_table *tbl,
struct iommu_table_group *table_group,
const __be32 *dma_window)
{
unsigned long offset, size;
@ -564,6 +565,9 @@ static void iommu_table_setparms_lpar(struct pci_controller *phb,
tbl->it_type = TCE_PCI;
tbl->it_offset = offset >> tbl->it_page_shift;
tbl->it_size = size >> tbl->it_page_shift;
table_group->tce32_start = offset;
table_group->tce32_size = size;
}
struct iommu_table_ops iommu_table_pseries_ops = {
@ -652,8 +656,38 @@ static void pci_dma_bus_setup_pSeries(struct pci_bus *bus)
pr_debug("ISA/IDE, window size is 0x%llx\n", pci->phb->dma_window_size);
}
#ifdef CONFIG_IOMMU_API
static int tce_exchange_pseries(struct iommu_table *tbl, long index, unsigned
long *tce, enum dma_data_direction *direction)
{
long rc;
unsigned long ioba = (unsigned long) index << tbl->it_page_shift;
unsigned long flags, oldtce = 0;
u64 proto_tce = iommu_direction_to_tce_perm(*direction);
unsigned long newtce = *tce | proto_tce;
spin_lock_irqsave(&tbl->large_pool.lock, flags);
rc = plpar_tce_get((u64)tbl->it_index, ioba, &oldtce);
if (!rc)
rc = plpar_tce_put((u64)tbl->it_index, ioba, newtce);
if (!rc) {
*direction = iommu_tce_direction(oldtce);
*tce = oldtce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
}
spin_unlock_irqrestore(&tbl->large_pool.lock, flags);
return rc;
}
#endif
struct iommu_table_ops iommu_table_lpar_multi_ops = {
.set = tce_buildmulti_pSeriesLP,
#ifdef CONFIG_IOMMU_API
.exchange = tce_exchange_pseries,
#endif
.clear = tce_freemulti_pSeriesLP,
.get = tce_get_pSeriesLP
};
@ -690,7 +724,8 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
if (!ppci->table_group) {
ppci->table_group = iommu_pseries_alloc_group(ppci->phb->node);
tbl = ppci->table_group->tables[0];
iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
iommu_table_setparms_lpar(ppci->phb, pdn, tbl,
ppci->table_group, dma_window);
tbl->it_ops = &iommu_table_lpar_multi_ops;
iommu_init_table(tbl, ppci->phb->node);
iommu_register_group(ppci->table_group,
@ -1144,7 +1179,8 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
if (!pci->table_group) {
pci->table_group = iommu_pseries_alloc_group(pci->phb->node);
tbl = pci->table_group->tables[0];
iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
iommu_table_setparms_lpar(pci->phb, pdn, tbl,
pci->table_group, dma_window);
tbl->it_ops = &iommu_table_lpar_multi_ops;
iommu_init_table(tbl, pci->phb->node);
iommu_register_group(pci->table_group,