linux-kernel - [PATCH v4 18/28] poweppc/powernv/ioda2: Rework iommu

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Message-Id: <1424081180-4494-19-git-send-email-aik@ozlabs.ru>
Date:	Mon, 16 Feb 2015 21:06:10 +1100
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>,
	Alexander Graf <agraf@...e.de>, linux-kernel@...r.kernel.org
Subject: [PATCH v4 18/28] poweppc/powernv/ioda2: Rework iommu_table creation

This moves iommu_table creation to the beginning. This is a mechanical
patch.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 31 +++++++++++++++++--------------
 drivers/vfio/vfio_iommu_spapr_tce.c       |  4 +++-
 2 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 6d279d5..ebfea0a 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1393,27 +1393,31 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
 	addr = page_address(tce_mem);
 	memset(addr, 0, tce_table_size);
 
+	/* Setup iommu */
+	pe->iommu.tables[0].it_iommu = &pe->iommu;
+
+	/* Setup linux iommu table */
+	tbl = &pe->iommu.tables[0];
+	pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
+			IOMMU_PAGE_SHIFT_4K);
+
+	tbl->it_ops = &pnv_ioda2_iommu_ops;
+	iommu_init_table(tbl, phb->hose->node);
+	pe->iommu.ops = &pnv_pci_ioda2_ops;
+
 	/*
 	 * Map TCE table through TVT. The TVE index is the PE number
 	 * shifted by 1 bit for 32-bits DMA space.
 	 */
 	rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
-					pe->pe_number << 1, 1, __pa(addr),
-					tce_table_size, 0x1000);
+			pe->pe_number << 1, 1, __pa(tbl->it_base),
+			tbl->it_size << 3, 1ULL << tbl->it_page_shift);
 	if (rc) {
 		pe_err(pe, "Failed to configure 32-bit TCE table,"
 		       " err %ld\n", rc);
 		goto fail;
 	}
 
-	/* Setup iommu */
-	pe->iommu.tables[0].it_iommu = &pe->iommu;
-
-	/* Setup linux iommu table */
-	tbl = &pe->iommu.tables[0];
-	pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
-			IOMMU_PAGE_SHIFT_4K);
-
 	/* OPAL variant of PHB3 invalidated TCEs */
 	swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
 	if (swinvp) {
@@ -1427,14 +1431,13 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
 				8);
 		tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);
 	}
-	tbl->it_ops = &pnv_ioda2_iommu_ops;
-	iommu_init_table(tbl, phb->hose->node);
-	pe->iommu.ops = &pnv_pci_ioda2_ops;
+
 	iommu_register_group(&pe->iommu, phb->hose->global_number,
 			pe->pe_number);
 
 	if (pe->pdev)
-		set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
+		set_iommu_table_base_and_group(&pe->pdev->dev,
+				&pe->iommu.tables[0]);
 	else
 		pnv_ioda_setup_bus_dma(pe, pe->pbus, true);
 
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index badb648..b5134b7 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -539,6 +539,7 @@ static long tce_iommu_build(struct tce_container *container,
 	struct page *page;
 	unsigned long hva, oldtce;
 	enum dma_data_direction direction = tce_iommu_direction(tce);
+	bool do_put = false;
 
 	for (i = 0; i < pages; ++i) {
 		if (tce_preregistered(container))
@@ -565,7 +566,8 @@ static long tce_iommu_build(struct tce_container *container,
 		oldtce = 0;
 		ret = iommu_tce_xchg(tbl, entry + i, hva, &oldtce, direction);
 		if (ret) {
-			tce_iommu_unuse_page(container, hva);
+			if (do_put)
+				tce_iommu_unuse_page(container, hva);
 			pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 					__func__, entry << tbl->it_page_shift,
 					tce, ret);
-- 
2.0.0

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