From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Fri, 5 Jun 2015 06:35:21 +0000 (+1000)
Subject: powerpc/powernv/ioda2: Use new helpers to do proper cleanup on PE release
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c035e37b58c75ca216bfd1d5de3c1080ac0022b9;p=openwrt%2Fstaging%2Fblogic.git

powerpc/powernv/ioda2: Use new helpers to do proper cleanup on PE release

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>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index ee3e643c16bb..510bb9c8a9e1 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1288,34 +1288,21 @@ 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;
 
-	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);
 
-	pnv_pci_unlink_table_and_group(tbl, &pe->table_group);
+	pnv_pci_ioda2_set_bypass(pe, false);
 	if (pe->table_group.group) {
 		iommu_group_put(pe->table_group.group);
 		BUG_ON(pe->table_group.group);