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SubjectRe: [PATCH kernel v10 03/34] powerpc/powernv/ioda: Clean up IOMMU group registration
On Tue, May 12, 2015 at 01:38:52AM +1000, Alexey Kardashevskiy wrote:
>The existing code has 3 calls to iommu_register_group() and
>all 3 branches actually cover all possible cases.
>
>This replaces 3 calls with one and moves the registration earlier;
>the latter will make more sense when we add TCE table sharing.
>
>Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

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

Thanks,
Gavin

>---
> arch/powerpc/platforms/powernv/pci-ioda.c | 28 ++++++++--------------------
> 1 file changed, 8 insertions(+), 20 deletions(-)
>
>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>index 9a77f3c..8ca7abd 100644
>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>@@ -1784,6 +1784,9 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> if (WARN_ON(pe->tce32_seg >= 0))
> return;
>
>+ tbl = pe->tce32_table;
>+ iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);
>+
> /* Grab a 32-bit TCE table */
> pe->tce32_seg = base;
> pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
>@@ -1818,7 +1821,6 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> }
>
> /* Setup linux iommu table */
>- tbl = pe->tce32_table;
> pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
> base << 28, IOMMU_PAGE_SHIFT_4K);
>
>@@ -1840,8 +1842,6 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> iommu_init_table(tbl, phb->hose->node);
>
> if (pe->flags & PNV_IODA_PE_DEV) {
>- iommu_register_group(tbl, phb->hose->global_number,
>- pe->pe_number);
> /*
> * Setting table base here only for carrying iommu_group
> * further down to let iommu_add_device() do the job.
>@@ -1849,14 +1849,8 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> */
> set_iommu_table_base(&pe->pdev->dev, tbl);
> iommu_add_device(&pe->pdev->dev);
>- } else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)) {
>- iommu_register_group(tbl, phb->hose->global_number,
>- pe->pe_number);
>+ } else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
> pnv_ioda_setup_bus_dma(pe, pe->pbus);
>- } else if (pe->flags & PNV_IODA_PE_VF) {
>- iommu_register_group(tbl, phb->hose->global_number,
>- pe->pe_number);
>- }
>
> return;
> fail:
>@@ -1923,6 +1917,9 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> if (WARN_ON(pe->tce32_seg >= 0))
> return;
>
>+ tbl = pe->tce32_table;
>+ iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);
>+
> /* The PE will reserve all possible 32-bits space */
> pe->tce32_seg = 0;
> end = (1 << ilog2(phb->ioda.m32_pci_base));
>@@ -1954,7 +1951,6 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> }
>
> /* Setup linux iommu table */
>- tbl = pe->tce32_table;
> pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
> IOMMU_PAGE_SHIFT_4K);
>
>@@ -1974,8 +1970,6 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> iommu_init_table(tbl, phb->hose->node);
>
> if (pe->flags & PNV_IODA_PE_DEV) {
>- iommu_register_group(tbl, phb->hose->global_number,
>- pe->pe_number);
> /*
> * Setting table base here only for carrying iommu_group
> * further down to let iommu_add_device() do the job.
>@@ -1983,14 +1977,8 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> */
> set_iommu_table_base(&pe->pdev->dev, tbl);
> iommu_add_device(&pe->pdev->dev);
>- } else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)) {
>- iommu_register_group(tbl, phb->hose->global_number,
>- pe->pe_number);
>+ } else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
> pnv_ioda_setup_bus_dma(pe, pe->pbus);
>- } else if (pe->flags & PNV_IODA_PE_VF) {
>- iommu_register_group(tbl, phb->hose->global_number,
>- pe->pe_number);
>- }
>
> /* Also create a bypass window */
> if (!pnv_iommu_bypass_disabled)
>--
>2.4.0.rc3.8.gfb3e7d5
>



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