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

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Date:	Sat, 25 Apr 2015 22:14:48 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	David Gibson <david@...son.dropbear.id.au>,
	linux-kernel@...r.kernel.org
Subject: [PATCH kernel v9 24/32] 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@...abs.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

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