[PATCH 2/2] powerpc: Change archdata dma_data to a union
Benjamin Herrenschmidt
benh at kernel.crashing.org
Mon Sep 21 15:21:37 EST 2009
On Wed, 2009-09-02 at 17:23 -0500, Becky Bruce wrote:
> Sometimes this is used to hold a simple offset, and sometimes
> it is used to hold a pointer. This patch changes it to a union containing
> void * and dma_addr_t. get/set accessors are also provided, because it was
> getting a bit ugly to get to the actual data.
Looks good, but please respin the two patches with the comment I
suggested added :-)
Cheers,
Ben.
> Signed-off-by: Becky Bruce <beckyb at kernel.crashing.org>
> ---
> arch/powerpc/include/asm/device.h | 11 ++++++++++-
> arch/powerpc/include/asm/dma-mapping.h | 10 ++++++++--
> arch/powerpc/include/asm/iommu.h | 10 ++++++++++
> arch/powerpc/kernel/dma-iommu.c | 16 ++++++++--------
> arch/powerpc/kernel/pci-common.c | 2 +-
> arch/powerpc/kernel/vio.c | 2 +-
> arch/powerpc/platforms/cell/beat_iommu.c | 2 +-
> arch/powerpc/platforms/cell/iommu.c | 9 +++------
> arch/powerpc/platforms/iseries/iommu.c | 2 +-
> arch/powerpc/platforms/pasemi/iommu.c | 2 +-
> arch/powerpc/platforms/pseries/iommu.c | 8 ++++----
> arch/powerpc/sysdev/dart_iommu.c | 2 +-
> 12 files changed, 49 insertions(+), 27 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
> index 67fcd7f..07ca8b5 100644
> --- a/arch/powerpc/include/asm/device.h
> +++ b/arch/powerpc/include/asm/device.h
> @@ -15,7 +15,16 @@ struct dev_archdata {
>
> /* DMA operations on that device */
> struct dma_map_ops *dma_ops;
> - void *dma_data;
> +
> + /*
> + * When an iommu is in use, dma_data is used as a ptr to the base of the
> + * iommu_table. Otherwise, it is a simple numerical offset.
> + */
> + union {
> + dma_addr_t dma_offset;
> + void *iommu_table_base;
> + } dma_data;
> +
> #ifdef CONFIG_SWIOTLB
> dma_addr_t max_direct_dma_addr;
> #endif
> diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
> index eef4db1..e9f4fe9 100644
> --- a/arch/powerpc/include/asm/dma-mapping.h
> +++ b/arch/powerpc/include/asm/dma-mapping.h
> @@ -89,14 +89,20 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
> dev->archdata.dma_ops = ops;
> }
>
> -static inline unsigned long get_dma_offset(struct device *dev)
> +static inline dma_addr_t get_dma_offset(struct device *dev)
> {
> if (dev)
> - return (unsigned long)dev->archdata.dma_data;
> + return dev->archdata.dma_data.dma_offset;
>
> return PCI_DRAM_OFFSET;
> }
>
> +static inline void set_dma_offset(struct device *dev, dma_addr_t off)
> +{
> + if (dev)
> + dev->archdata.dma_data.dma_offset = off;
> +}
> +
> /* this will be removed soon */
> #define flush_write_buffers()
>
> diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
> index 7464c0d..edfc980 100644
> --- a/arch/powerpc/include/asm/iommu.h
> +++ b/arch/powerpc/include/asm/iommu.h
> @@ -70,6 +70,16 @@ struct iommu_table {
>
> struct scatterlist;
>
> +static inline void set_iommu_table_base(struct device *dev, void *base)
> +{
> + dev->archdata.dma_data.iommu_table_base = base;
> +}
> +
> +static inline void *get_iommu_table_base(struct device *dev)
> +{
> + return dev->archdata.dma_data.iommu_table_base;
> +}
> +
> /* Frees table for an individual device node */
> extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
>
> diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
> index 87ddb3f..37771a5 100644
> --- a/arch/powerpc/kernel/dma-iommu.c
> +++ b/arch/powerpc/kernel/dma-iommu.c
> @@ -18,7 +18,7 @@
> static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t flag)
> {
> - return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
> + return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
> dma_handle, device_to_mask(dev), flag,
> dev_to_node(dev));
> }
> @@ -26,7 +26,7 @@ static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
> static void dma_iommu_free_coherent(struct device *dev, size_t size,
> void *vaddr, dma_addr_t dma_handle)
> {
> - iommu_free_coherent(dev->archdata.dma_data, size, vaddr, dma_handle);
> + iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle);
> }
>
> /* Creates TCEs for a user provided buffer. The user buffer must be
> @@ -39,8 +39,8 @@ static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page,
> enum dma_data_direction direction,
> struct dma_attrs *attrs)
> {
> - return iommu_map_page(dev, dev->archdata.dma_data, page, offset, size,
> - device_to_mask(dev), direction, attrs);
> + return iommu_map_page(dev, get_iommu_table_base(dev), page, offset,
> + size, device_to_mask(dev), direction, attrs);
> }
>
>
> @@ -48,7 +48,7 @@ static void dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
> size_t size, enum dma_data_direction direction,
> struct dma_attrs *attrs)
> {
> - iommu_unmap_page(dev->archdata.dma_data, dma_handle, size, direction,
> + iommu_unmap_page(get_iommu_table_base(dev), dma_handle, size, direction,
> attrs);
> }
>
> @@ -57,7 +57,7 @@ static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
> int nelems, enum dma_data_direction direction,
> struct dma_attrs *attrs)
> {
> - return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems,
> + return iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems,
> device_to_mask(dev), direction, attrs);
> }
>
> @@ -65,14 +65,14 @@ static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
> int nelems, enum dma_data_direction direction,
> struct dma_attrs *attrs)
> {
> - iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction,
> + iommu_unmap_sg(get_iommu_table_base(dev), sglist, nelems, direction,
> attrs);
> }
>
> /* We support DMA to/from any memory page via the iommu */
> static int dma_iommu_dma_supported(struct device *dev, u64 mask)
> {
> - struct iommu_table *tbl = dev->archdata.dma_data;
> + struct iommu_table *tbl = get_iommu_table_base(dev);
>
> if (!tbl || tbl->it_offset > mask) {
> printk(KERN_INFO
> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index e9f4840..bb8209e 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -1117,7 +1117,7 @@ void __devinit pcibios_setup_bus_devices(struct pci_bus *bus)
>
> /* Hook up default DMA ops */
> sd->dma_ops = pci_dma_ops;
> - sd->dma_data = (void *)PCI_DRAM_OFFSET;
> + set_dma_offset(&dev->dev, PCI_DRAM_OFFSET);
>
> /* Additional platform DMA/iommu setup */
> if (ppc_md.pci_dma_dev_setup)
> diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
> index bc7b41e..8d9275f 100644
> --- a/arch/powerpc/kernel/vio.c
> +++ b/arch/powerpc/kernel/vio.c
> @@ -1233,7 +1233,7 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
> vio_cmo_set_dma_ops(viodev);
> else
> viodev->dev.archdata.dma_ops = &dma_iommu_ops;
> - viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
> + set_iommu_table_base(&viodev->dev, vio_build_iommu_table(viodev));
> set_dev_node(&viodev->dev, of_node_to_nid(of_node));
>
> /* init generic 'struct device' fields: */
> diff --git a/arch/powerpc/platforms/cell/beat_iommu.c b/arch/powerpc/platforms/cell/beat_iommu.c
> index 93b0efd..39d361c 100644
> --- a/arch/powerpc/platforms/cell/beat_iommu.c
> +++ b/arch/powerpc/platforms/cell/beat_iommu.c
> @@ -77,7 +77,7 @@ static void __init celleb_init_direct_mapping(void)
> static void celleb_dma_dev_setup(struct device *dev)
> {
> dev->archdata.dma_ops = get_pci_dma_ops();
> - dev->archdata.dma_data = (void *)celleb_dma_direct_offset;
> + set_dma_offset(dev, celleb_dma_direct_offset);
> }
>
> static void celleb_pci_dma_dev_setup(struct pci_dev *pdev)
> diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
> index 416db17..ca5bfdf 100644
> --- a/arch/powerpc/platforms/cell/iommu.c
> +++ b/arch/powerpc/platforms/cell/iommu.c
> @@ -657,15 +657,13 @@ static void cell_dma_dev_setup_fixed(struct device *dev);
>
> static void cell_dma_dev_setup(struct device *dev)
> {
> - struct dev_archdata *archdata = &dev->archdata;
> -
> /* Order is important here, these are not mutually exclusive */
> if (get_dma_ops(dev) == &dma_iommu_fixed_ops)
> cell_dma_dev_setup_fixed(dev);
> else if (get_pci_dma_ops() == &dma_iommu_ops)
> - archdata->dma_data = cell_get_iommu_table(dev);
> + set_iommu_table_base(dev, cell_get_iommu_table(dev));
> else if (get_pci_dma_ops() == &dma_direct_ops)
> - archdata->dma_data = (void *)cell_dma_direct_offset;
> + set_dma_offset(dev, cell_dma_direct_offset);
> else
> BUG();
> }
> @@ -973,11 +971,10 @@ static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask)
>
> static void cell_dma_dev_setup_fixed(struct device *dev)
> {
> - struct dev_archdata *archdata = &dev->archdata;
> u64 addr;
>
> addr = cell_iommu_get_fixed_address(dev) + dma_iommu_fixed_base;
> - archdata->dma_data = (void *)addr;
> + set_dma_offset(dev, addr);
>
> dev_dbg(dev, "iommu: fixed addr = %llx\n", addr);
> }
> diff --git a/arch/powerpc/platforms/iseries/iommu.c b/arch/powerpc/platforms/iseries/iommu.c
> index 6c1e101..9d53cb4 100644
> --- a/arch/powerpc/platforms/iseries/iommu.c
> +++ b/arch/powerpc/platforms/iseries/iommu.c
> @@ -193,7 +193,7 @@ static void pci_dma_dev_setup_iseries(struct pci_dev *pdev)
> pdn->iommu_table = iommu_init_table(tbl, -1);
> else
> kfree(tbl);
> - pdev->dev.archdata.dma_data = pdn->iommu_table;
> + set_iommu_table_base(&pdev->dev, pdn->iommu_table);
> }
> #else
> #define pci_dma_dev_setup_iseries NULL
> diff --git a/arch/powerpc/platforms/pasemi/iommu.c b/arch/powerpc/platforms/pasemi/iommu.c
> index a0ff03a..7b1d608 100644
> --- a/arch/powerpc/platforms/pasemi/iommu.c
> +++ b/arch/powerpc/platforms/pasemi/iommu.c
> @@ -189,7 +189,7 @@ static void pci_dma_dev_setup_pasemi(struct pci_dev *dev)
> }
> #endif
>
> - dev->dev.archdata.dma_data = &iommu_table_iobmap;
> + set_iommu_table_base(&dev->dev, &iommu_table_iobmap);
> }
>
> static void pci_dma_bus_setup_null(struct pci_bus *b) { }
> diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
> index 661c8e0..1a0000a 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -482,7 +482,7 @@ static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
> phb->node);
> iommu_table_setparms(phb, dn, tbl);
> PCI_DN(dn)->iommu_table = iommu_init_table(tbl, phb->node);
> - dev->dev.archdata.dma_data = PCI_DN(dn)->iommu_table;
> + set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
> return;
> }
>
> @@ -494,7 +494,7 @@ static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
> dn = dn->parent;
>
> if (dn && PCI_DN(dn))
> - dev->dev.archdata.dma_data = PCI_DN(dn)->iommu_table;
> + set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
> else
> printk(KERN_WARNING "iommu: Device %s has no iommu table\n",
> pci_name(dev));
> @@ -538,7 +538,7 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
> */
> if (dma_window == NULL || pdn->parent == NULL) {
> pr_debug(" no dma window for device, linking to parent\n");
> - dev->dev.archdata.dma_data = PCI_DN(pdn)->iommu_table;
> + set_iommu_table_base(&dev->dev, PCI_DN(pdn)->iommu_table);
> return;
> }
>
> @@ -554,7 +554,7 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
> pr_debug(" found DMA window, table: %p\n", pci->iommu_table);
> }
>
> - dev->dev.archdata.dma_data = pci->iommu_table;
> + set_iommu_table_base(&dev->dev, pci->iommu_table);
> }
> #else /* CONFIG_PCI */
> #define pci_dma_bus_setup_pSeries NULL
> diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
> index 89639ec..ae3c4db 100644
> --- a/arch/powerpc/sysdev/dart_iommu.c
> +++ b/arch/powerpc/sysdev/dart_iommu.c
> @@ -297,7 +297,7 @@ static void pci_dma_dev_setup_dart(struct pci_dev *dev)
> /* We only have one iommu table on the mac for now, which makes
> * things simple. Setup all PCI devices to point to this table
> */
> - dev->dev.archdata.dma_data = &iommu_table_dart;
> + set_iommu_table_base(&dev->dev, &iommu_table_dart);
> }
>
> static void pci_dma_bus_setup_dart(struct pci_bus *bus)
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