[PATCH kernel v9 24/32] powerpc/powernv/ioda2: Use new helpers to do proper cleanup on PE release

Alexey Kardashevskiy
2015-04-25T12:17:23Z

The existing code programmed TVT#0 with some address and then
immediately released that memory.

This makes use of pnv_pci_ioda2_unset_window() and
pnv_pci_ioda2_set_bypass() which do correct resource release and
TVT update.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 33 ++++++++++---------------------
1 file changed, 10 insertions(+), 23 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 4828837..2a4b2b2 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1281,34 +1281,21 @@ m64_failed:
return -EBUSY;
}

+static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
+ int num);
+static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable);
+
static void pnv_pci_ioda2_release_dma_pe(struct pci_dev *dev, struct pnv_ioda_pe *pe)
{
- struct pci_bus *bus;
- struct pci_controller *hose;
- struct pnv_phb *phb;
- struct iommu_table *tbl;
- unsigned long addr;
- int64_t rc;
+ long rc;

- bus = dev->bus;
- hose = pci_bus_to_host(bus);
- phb = hose->private_data;
- tbl = &pe->table_group.tables[0];
- addr = tbl->it_base;
-
- opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
- pe->pe_number << 1, 1, __pa(addr),
- 0, 0x1000);
-
- rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
- pe->pe_number,
- (pe->pe_number << 1) + 1,
- pe->tce_bypass_base,
- 0);
+ rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0);
if (rc)
- pe_warn(pe, "OPAL error %ld release DMA window\n", rc);
+ pe_warn(pe, "OPAL error %ld release default DMA window\n", rc);

- pnv_pci_free_table(tbl);
+ pnv_pci_ioda2_set_bypass(pe, false);
+
+ pnv_pci_free_table(&pe->table_group.tables[0]);
}

static void pnv_ioda_release_vf_PE(struct pci_dev *pdev, u16 num_vfs)
--
2.0.0