linux-kernel - Re: [PATCH kernel v10 24/34] powerpc/powernv/ioda2: Rework iommu

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Date:	Thu, 14 May 2015 14:14:06 +1000
From:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v10 24/34] powerpc/powernv/ioda2: Rework
 iommu_table creation

On Tue, May 12, 2015 at 01:39:13AM +1000, Alexey Kardashevskiy wrote:
>This moves iommu_table creation to the beginning to make following changes
>easier to review. This starts using table parameters from the iommu_table
>struct.
>
>This should cause no behavioural change.
>
>Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
>Reviewed-by: David Gibson <david@...son.dropbear.id.au>

Reviewed-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>

Thanks,
Gavin

>---
>Changes:
>v9:
>* updated commit log and did minor cleanup
>---
> arch/powerpc/platforms/powernv/pci-ioda.c | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>index e3c784d..9b80b74 100644
>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>@@ -2074,13 +2074,23 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> 	addr = page_address(tce_mem);
> 	memset(addr, 0, tce_table_size);
>
>+	/* Setup linux iommu table */
>+	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);
>+#ifdef CONFIG_IOMMU_API
>+	pe->table_group.ops = &pnv_pci_ioda2_ops;
>+#endif
>+
> 	/*
> 	 * 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);
>@@ -2089,20 +2099,10 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
>
> 	pnv_pci_ioda2_tvt_invalidate(pe);
>
>-	/* Setup linux iommu table */
>-	pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
>-			IOMMU_PAGE_SHIFT_4K);
>-
> 	/* OPAL variant of PHB3 invalidated TCEs */
> 	if (pe->tce_inval_reg)
> 		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);
>-#ifdef CONFIG_IOMMU_API
>-	pe->table_group.ops = &pnv_pci_ioda2_ops;
>-#endif
>-
> 	if (pe->flags & PNV_IODA_PE_DEV) {
> 		/*
> 		 * Setting table base here only for carrying iommu_group
>-- 
>2.4.0.rc3.8.gfb3e7d5
>

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