On Tue, Feb 24, 2015 at 02:34:35AM -0600, Bjorn Helgaas wrote:
> From: Wei Yang <weiy...@linux.vnet.ibm.com>
>
> Current iommu_table of a PE is a static field. This will have a problem
> when iommu_free_table() is called.
>
> Allocate iommu_table dynamically.
I'd like a little more explanation about why we're calling
iommu_free_table() now when we didn't call it before. Maybe this happens
when we disable SR-IOV and the VFs go away?
Is there a hotplug remove path where we should also be calling
iommu_free_table()?
> Signed-off-by: Wei Yang <weiy...@linux.vnet.ibm.com>
> Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
> ---
> arch/powerpc/include/asm/iommu.h | 3 +++
> arch/powerpc/platforms/powernv/pci-ioda.c | 26 ++++++++++++++------------
> arch/powerpc/platforms/powernv/pci.h | 2 +-
> 3 files changed, 18 insertions(+), 13 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/iommu.h
> b/arch/powerpc/include/asm/iommu.h
> index 9cfa3706a1b8..5574eeb97634 100644
> --- a/arch/powerpc/include/asm/iommu.h
> +++ b/arch/powerpc/include/asm/iommu.h
> @@ -78,6 +78,9 @@ struct iommu_table {
> struct iommu_group *it_group;
> #endif
> void (*set_bypass)(struct iommu_table *tbl, bool enable);
> +#ifdef CONFIG_PPC_POWERNV
> + void *data;
> +#endif
> };
>
> /* Pure 2^n version of get_order */
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
> b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 58c4fc4ab63c..cd1a56160ded 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -916,6 +916,10 @@ static void pnv_ioda_setup_bus_PE(struct pci_bus *bus,
> int all)
> return;
> }
>
> + pe->tce32_table = kzalloc_node(sizeof(struct iommu_table),
> + GFP_KERNEL, hose->node);
> + pe->tce32_table->data = pe;
> +
> /* Associate it with all child devices */
> pnv_ioda_setup_same_PE(bus, pe);
>
> @@ -1005,7 +1009,7 @@ static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb
> *phb, struct pci_dev *pdev
>
> pe = &phb->ioda.pe_array[pdn->pe_number];
> WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
> - set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
> + set_iommu_table_base_and_group(&pdev->dev, pe->tce32_table);
> }
>
> static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
> @@ -1032,7 +1036,7 @@ static int pnv_pci_ioda_dma_set_mask(struct pnv_phb
> *phb,
> } else {
> dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
> set_dma_ops(&pdev->dev, &dma_iommu_ops);
> - set_iommu_table_base(&pdev->dev, &pe->tce32_table);
> + set_iommu_table_base(&pdev->dev, pe->tce32_table);
> }
> *pdev->dev.dma_mask = dma_mask;
> return 0;
> @@ -1069,9 +1073,9 @@ static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe
> *pe,
> list_for_each_entry(dev, &bus->devices, bus_list) {
> if (add_to_iommu_group)
> set_iommu_table_base_and_group(&dev->dev,
> - &pe->tce32_table);
> + pe->tce32_table);
> else
> - set_iommu_table_base(&dev->dev, &pe->tce32_table);
> + set_iommu_table_base(&dev->dev, pe->tce32_table);
>
> if (dev->subordinate)
> pnv_ioda_setup_bus_dma(pe, dev->subordinate,
> @@ -1161,8 +1165,7 @@ static void pnv_pci_ioda2_tce_invalidate(struct
> pnv_ioda_pe *pe,
> void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
> __be64 *startp, __be64 *endp, bool rm)
> {
> - struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
> - tce32_table);
> + struct pnv_ioda_pe *pe = tbl->data;
> struct pnv_phb *phb = pe->phb;
>
> if (phb->type == PNV_PHB_IODA1)
> @@ -1228,7 +1231,7 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb
> *phb,
> }
>
> /* Setup linux iommu table */
> - tbl = &pe->tce32_table;
> + tbl = pe->tce32_table;
> pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
> base << 28, IOMMU_PAGE_SHIFT_4K);
>
> @@ -1266,8 +1269,7 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb
> *phb,
>
> static void pnv_pci_ioda2_set_bypass(struct iommu_table *tbl, bool enable)
> {
> - struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
> - tce32_table);
> + struct pnv_ioda_pe *pe = tbl->data;
> uint16_t window_id = (pe->pe_number << 1 ) + 1;
> int64_t rc;
>
> @@ -1312,10 +1314,10 @@ static void pnv_pci_ioda2_setup_bypass_pe(struct
> pnv_phb *phb,
> pe->tce_bypass_base = 1ull << 59;
>
> /* Install set_bypass callback for VFIO */
> - pe->tce32_table.set_bypass = pnv_pci_ioda2_set_bypass;
> + pe->tce32_table->set_bypass = pnv_pci_ioda2_set_bypass;
>
> /* Enable bypass by default */
> - pnv_pci_ioda2_set_bypass(&pe->tce32_table, true);
> + pnv_pci_ioda2_set_bypass(pe->tce32_table, true);
> }
>
> static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> @@ -1363,7 +1365,7 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb
> *phb,
> }
>
> /* Setup linux iommu table */
> - tbl = &pe->tce32_table;
> + tbl = pe->tce32_table;
> pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
> IOMMU_PAGE_SHIFT_4K);
>
> diff --git a/arch/powerpc/platforms/powernv/pci.h
> b/arch/powerpc/platforms/powernv/pci.h
> index e5b75b298d95..731777734bca 100644
> --- a/arch/powerpc/platforms/powernv/pci.h
> +++ b/arch/powerpc/platforms/powernv/pci.h
> @@ -53,7 +53,7 @@ struct pnv_ioda_pe {
> /* "Base" iommu table, ie, 4K TCEs, 32-bit DMA */
> int tce32_seg;
> int tce32_segcount;
> - struct iommu_table tce32_table;
> + struct iommu_table *tce32_table;
> phys_addr_t tce_inval_reg_phys;
>
> /* 64-bit TCE bypass region */
>
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