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Date: Tue, 13 Sep 2016 10:59:37 -0700 (PDT)
From: Stefano Stabellini <sstabellini@...nel.org>
To: Christoph Hellwig <hch@....de>
cc: sstabellini@...nel.org, konrad.wilk@...cle.com,
boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
jgross@...e.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen: consolidate swiotbl_xen dma_ops
On Sun, 11 Sep 2016, Christoph Hellwig wrote:
> x86 wasn't wiring up ->set_dma_mask before, but it's the same as the
> default so we are fine. (arm can't remove it just yet, but eventually
> we'll get there).
>
> Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Stefano Stabellini <sstabellini@...nel.org>
> arch/arm/xen/mm.c | 16 -----------
> arch/x86/xen/pci-swiotlb-xen.c | 15 ----------
> drivers/xen/swiotlb-xen.c | 63 ++++++++++++++++++++++++------------------
> include/xen/swiotlb-xen.h | 54 ++----------------------------------
> 4 files changed, 38 insertions(+), 110 deletions(-)
>
> diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
> index d062f08..d2601ce 100644
> --- a/arch/arm/xen/mm.c
> +++ b/arch/arm/xen/mm.c
> @@ -185,22 +185,6 @@ EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
> struct dma_map_ops *xen_dma_ops;
> EXPORT_SYMBOL(xen_dma_ops);
>
> -static struct dma_map_ops xen_swiotlb_dma_ops = {
> - .mapping_error = xen_swiotlb_dma_mapping_error,
> - .alloc = xen_swiotlb_alloc_coherent,
> - .free = xen_swiotlb_free_coherent,
> - .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
> - .sync_single_for_device = xen_swiotlb_sync_single_for_device,
> - .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
> - .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
> - .map_sg = xen_swiotlb_map_sg_attrs,
> - .unmap_sg = xen_swiotlb_unmap_sg_attrs,
> - .map_page = xen_swiotlb_map_page,
> - .unmap_page = xen_swiotlb_unmap_page,
> - .dma_supported = xen_swiotlb_dma_supported,
> - .set_dma_mask = xen_swiotlb_set_dma_mask,
> -};
> -
> int __init xen_mm_init(void)
> {
> struct gnttab_cache_flush cflush;
> diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
> index 0e98e5d..4809aab 100644
> --- a/arch/x86/xen/pci-swiotlb-xen.c
> +++ b/arch/x86/xen/pci-swiotlb-xen.c
> @@ -18,21 +18,6 @@
>
> int xen_swiotlb __read_mostly;
>
> -static struct dma_map_ops xen_swiotlb_dma_ops = {
> - .mapping_error = xen_swiotlb_dma_mapping_error,
> - .alloc = xen_swiotlb_alloc_coherent,
> - .free = xen_swiotlb_free_coherent,
> - .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
> - .sync_single_for_device = xen_swiotlb_sync_single_for_device,
> - .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
> - .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
> - .map_sg = xen_swiotlb_map_sg_attrs,
> - .unmap_sg = xen_swiotlb_unmap_sg_attrs,
> - .map_page = xen_swiotlb_map_page,
> - .unmap_page = xen_swiotlb_unmap_page,
> - .dma_supported = xen_swiotlb_dma_supported,
> -};
> -
> /*
> * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
> *
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 87e6035..1060c77 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -47,6 +47,12 @@
> #include <asm/xen/page-coherent.h>
>
> #include <trace/events/swiotlb.h>
> +
> +static void
> +xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> + int nelems, enum dma_data_direction dir,
> + unsigned long attrs);
> +
> /*
> * Used to do a quick range check in swiotlb_tbl_unmap_single and
> * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
> @@ -291,7 +297,8 @@ error:
> free_pages((unsigned long)xen_io_tlb_start, order);
> return rc;
> }
> -void *
> +
> +static void *
> xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
> dma_addr_t *dma_handle, gfp_t flags,
> unsigned long attrs)
> @@ -342,9 +349,8 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
> memset(ret, 0, size);
> return ret;
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_alloc_coherent);
>
> -void
> +static void
> xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
> dma_addr_t dev_addr, unsigned long attrs)
> {
> @@ -365,8 +371,6 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
>
> xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs);
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_free_coherent);
> -
>
> /*
> * Map a single buffer of the indicated size for DMA in streaming mode. The
> @@ -375,7 +379,7 @@ EXPORT_SYMBOL_GPL(xen_swiotlb_free_coherent);
> * Once the device is given the dma address, the device owns this memory until
> * either xen_swiotlb_unmap_page or xen_swiotlb_dma_sync_single is performed.
> */
> -dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
> +static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
> unsigned long offset, size_t size,
> enum dma_data_direction dir,
> unsigned long attrs)
> @@ -422,7 +426,6 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
> }
> return dev_addr;
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_map_page);
>
> /*
> * Unmap a single streaming mode DMA translation. The dma_addr and size must
> @@ -460,13 +463,12 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
> dma_mark_clean(phys_to_virt(paddr), size);
> }
>
> -void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
> +static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
> size_t size, enum dma_data_direction dir,
> unsigned long attrs)
> {
> xen_unmap_single(hwdev, dev_addr, size, dir, attrs);
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_unmap_page);
>
> /*
> * Make physical memory consistent for a single streaming mode DMA translation
> @@ -503,21 +505,19 @@ xen_swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
> dma_mark_clean(phys_to_virt(paddr), size);
> }
>
> -void
> +static void
> xen_swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
> size_t size, enum dma_data_direction dir)
> {
> xen_swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_sync_single_for_cpu);
>
> -void
> +static void
> xen_swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
> size_t size, enum dma_data_direction dir)
> {
> xen_swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_sync_single_for_device);
>
> /*
> * Map a set of buffers described by scatterlist in streaming mode for DMA.
> @@ -535,7 +535,7 @@ EXPORT_SYMBOL_GPL(xen_swiotlb_sync_single_for_device);
> * Device ownership issues as mentioned above for xen_swiotlb_map_page are the
> * same here.
> */
> -int
> +static int
> xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> int nelems, enum dma_data_direction dir,
> unsigned long attrs)
> @@ -590,13 +590,12 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> }
> return nelems;
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_map_sg_attrs);
>
> /*
> * Unmap a set of streaming mode DMA translations. Again, cpu read rules
> * concerning calls here are the same as for swiotlb_unmap_page() above.
> */
> -void
> +static void
> xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> int nelems, enum dma_data_direction dir,
> unsigned long attrs)
> @@ -610,7 +609,6 @@ xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> xen_unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir, attrs);
>
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_unmap_sg_attrs);
>
> /*
> * Make physical memory consistent for a set of streaming mode DMA translations
> @@ -632,28 +630,25 @@ xen_swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
> sg_dma_len(sg), dir, target);
> }
>
> -void
> +static void
> xen_swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
> int nelems, enum dma_data_direction dir)
> {
> xen_swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_sync_sg_for_cpu);
>
> -void
> +static void
> xen_swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
> int nelems, enum dma_data_direction dir)
> {
> xen_swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_sync_sg_for_device);
>
> -int
> +static int
> xen_swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
> {
> return !dma_addr;
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mapping_error);
>
> /*
> * Return whether the given device DMA address mask can be supported
> @@ -661,14 +656,13 @@ EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mapping_error);
> * during bus mastering, then you would pass 0x00ffffff as the mask to
> * this function.
> */
> -int
> +static int
> xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
> {
> return xen_virt_to_bus(xen_io_tlb_end - 1) <= mask;
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_dma_supported);
>
> -int
> +static int
> xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
> {
> if (!dev->dma_mask || !xen_swiotlb_dma_supported(dev, dma_mask))
> @@ -678,4 +672,19 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
>
> return 0;
> }
> -EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);
> +
> +struct dma_map_ops xen_swiotlb_dma_ops = {
> + .mapping_error = xen_swiotlb_dma_mapping_error,
> + .alloc = xen_swiotlb_alloc_coherent,
> + .free = xen_swiotlb_free_coherent,
> + .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
> + .sync_single_for_device = xen_swiotlb_sync_single_for_device,
> + .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
> + .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
> + .map_sg = xen_swiotlb_map_sg_attrs,
> + .unmap_sg = xen_swiotlb_unmap_sg_attrs,
> + .map_page = xen_swiotlb_map_page,
> + .unmap_page = xen_swiotlb_unmap_page,
> + .dma_supported = xen_swiotlb_dma_supported,
> + .set_dma_mask = xen_swiotlb_set_dma_mask,
> +};
> diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h
> index 7c35e27..0e44f26 100644
> --- a/include/xen/swiotlb-xen.h
> +++ b/include/xen/swiotlb-xen.h
> @@ -1,61 +1,11 @@
> #ifndef __LINUX_SWIOTLB_XEN_H
> #define __LINUX_SWIOTLB_XEN_H
>
> -#include <linux/dma-direction.h>
> +#include <linux/dma-mapping.h>
> #include <linux/swiotlb.h>
>
> extern int xen_swiotlb_init(int verbose, bool early);
>
> -extern void
> -*xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
> - dma_addr_t *dma_handle, gfp_t flags,
> - unsigned long attrs);
> +extern struct dma_map_ops xen_swiotlb_dma_ops;
>
> -extern void
> -xen_swiotlb_free_coherent(struct device *hwdev, size_t size,
> - void *vaddr, dma_addr_t dma_handle,
> - unsigned long attrs);
> -
> -extern dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
> - unsigned long offset, size_t size,
> - enum dma_data_direction dir,
> - unsigned long attrs);
> -
> -extern void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
> - size_t size, enum dma_data_direction dir,
> - unsigned long attrs);
> -extern int
> -xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> - int nelems, enum dma_data_direction dir,
> - unsigned long attrs);
> -
> -extern void
> -xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
> - int nelems, enum dma_data_direction dir,
> - unsigned long attrs);
> -
> -extern void
> -xen_swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
> - size_t size, enum dma_data_direction dir);
> -
> -extern void
> -xen_swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
> - int nelems, enum dma_data_direction dir);
> -
> -extern void
> -xen_swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
> - size_t size, enum dma_data_direction dir);
> -
> -extern void
> -xen_swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
> - int nelems, enum dma_data_direction dir);
> -
> -extern int
> -xen_swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
> -
> -extern int
> -xen_swiotlb_dma_supported(struct device *hwdev, u64 mask);
> -
> -extern int
> -xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask);
> #endif /* __LINUX_SWIOTLB_XEN_H */
> --
> 2.1.4
>
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