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Date:   Mon, 22 Oct 2018 18:52:51 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/10] arm64: use the generic swiotlb_dma_ops

On 08/10/2018 09:02, Christoph Hellwig wrote:
> Now that the generic swiotlb code supports non-coherent DMA we can switch
> to it for arm64.  For that we need to refactor the existing
> alloc/free/mmap/pgprot helpers to be used as the architecture hooks,
> and implement the standard arch_sync_dma_for_{device,cpu} hooks for
> cache maintaincance in the streaming dma hooks, which also implies
> using the generic dma_coherent flag in struct device.
> 
> Note that we need to keep the old is_device_dma_coherent function around
> for now, so that the shared arm/arm64 Xen code keeps working.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   arch/arm64/Kconfig                   |   4 +
>   arch/arm64/include/asm/device.h      |   1 -
>   arch/arm64/include/asm/dma-mapping.h |   7 +-
>   arch/arm64/mm/dma-mapping.c          | 257 +++++----------------------
>   4 files changed, 56 insertions(+), 213 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 1b1a0e95c751..c4db5131d837 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -11,6 +11,8 @@ config ARM64
>   	select ARCH_CLOCKSOURCE_DATA
>   	select ARCH_HAS_DEBUG_VIRTUAL
>   	select ARCH_HAS_DEVMEM_IS_ALLOWED
> +	select ARCH_HAS_DMA_COHERENT_TO_PFN
> +	select ARCH_HAS_DMA_MMAP_PGPROT
>   	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
>   	select ARCH_HAS_ELF_RANDOMIZE
>   	select ARCH_HAS_FAST_MULTIPLIER
> @@ -24,6 +26,8 @@ config ARM64
>   	select ARCH_HAS_SG_CHAIN
>   	select ARCH_HAS_STRICT_KERNEL_RWX
>   	select ARCH_HAS_STRICT_MODULE_RWX
> +	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
> +	select ARCH_HAS_SYNC_DMA_FOR_CPU
>   	select ARCH_HAS_SYSCALL_WRAPPER
>   	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
>   	select ARCH_HAVE_NMI_SAFE_CMPXCHG
> diff --git a/arch/arm64/include/asm/device.h b/arch/arm64/include/asm/device.h
> index 5a5fa47a6b18..3dd3d664c5c5 100644
> --- a/arch/arm64/include/asm/device.h
> +++ b/arch/arm64/include/asm/device.h
> @@ -23,7 +23,6 @@ struct dev_archdata {
>   #ifdef CONFIG_XEN
>   	const struct dma_map_ops *dev_dma_ops;
>   #endif
> -	bool dma_coherent;
>   };
>   
>   struct pdev_archdata {
> diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
> index b7847eb8a7bb..c41f3fb1446c 100644
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ b/arch/arm64/include/asm/dma-mapping.h
> @@ -44,10 +44,13 @@ void arch_teardown_dma_ops(struct device *dev);
>   #define arch_teardown_dma_ops	arch_teardown_dma_ops
>   #endif
>   
> -/* do not use this function in a driver */
> +/*
> + * Do not use this function in a driver, it is only provided for
> + * arch/arm/mm/xen.c, which is used by arm64 as well.
> + */
>   static inline bool is_device_dma_coherent(struct device *dev)
>   {
> -	return dev->archdata.dma_coherent;
> +	return dev->dma_coherent;
>   }
>   
>   #endif	/* __KERNEL__ */
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index eee6cfcfde9e..3c75d69b54e7 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -25,6 +25,7 @@
>   #include <linux/slab.h>
>   #include <linux/genalloc.h>
>   #include <linux/dma-direct.h>
> +#include <linux/dma-noncoherent.h>
>   #include <linux/dma-contiguous.h>
>   #include <linux/vmalloc.h>
>   #include <linux/swiotlb.h>
> @@ -32,16 +33,6 @@
>   
>   #include <asm/cacheflush.h>
>   
> -static int swiotlb __ro_after_init;
> -
> -static pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot,
> -				 bool coherent)
> -{
> -	if (!coherent || (attrs & DMA_ATTR_WRITE_COMBINE))
> -		return pgprot_writecombine(prot);
> -	return prot;
> -}
> -
>   static struct gen_pool *atomic_pool __ro_after_init;
>   
>   #define DEFAULT_DMA_COHERENT_POOL_SIZE  SZ_256K
> @@ -91,18 +82,16 @@ static int __free_from_pool(void *start, size_t size)
>   	return 1;
>   }
>   
> -static void *__dma_alloc(struct device *dev, size_t size,
> -			 dma_addr_t *dma_handle, gfp_t flags,
> -			 unsigned long attrs)
> +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
> +		gfp_t flags, unsigned long attrs)
>   {
>   	struct page *page;
>   	void *ptr, *coherent_ptr;
> -	bool coherent = is_device_dma_coherent(dev);
> -	pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, false);
> +	pgprot_t prot = pgprot_writecombine(PAGE_KERNEL);
>   
>   	size = PAGE_ALIGN(size);
>   
> -	if (!coherent && !gfpflags_allow_blocking(flags)) {
> +	if (!gfpflags_allow_blocking(flags)) {
>   		struct page *page = NULL;
>   		void *addr = __alloc_from_pool(size, &page, flags);
>   
> @@ -116,10 +105,6 @@ static void *__dma_alloc(struct device *dev, size_t size,
>   	if (!ptr)
>   		goto no_mem;
>   
> -	/* no need for non-cacheable mapping if coherent */
> -	if (coherent)
> -		return ptr;
> -
>   	/* remove any dirty cache lines on the kernel alias */
>   	__dma_flush_area(ptr, size);
>   
> @@ -138,125 +123,50 @@ static void *__dma_alloc(struct device *dev, size_t size,
>   	return NULL;
>   }
>   
> -static void __dma_free(struct device *dev, size_t size,
> -		       void *vaddr, dma_addr_t dma_handle,
> -		       unsigned long attrs)
> -{
> -	void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
> -
> -	size = PAGE_ALIGN(size);
> -
> -	if (!is_device_dma_coherent(dev)) {
> -		if (__free_from_pool(vaddr, size))
> -			return;
> -		vunmap(vaddr);
> -	}
> -	dma_direct_free_pages(dev, size, swiotlb_addr, dma_handle, attrs);
> -}
> -
> -static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,
> -				     unsigned long offset, size_t size,
> -				     enum dma_data_direction dir,
> -				     unsigned long attrs)
> -{
> -	dma_addr_t dev_addr;
> -
> -	dev_addr = swiotlb_map_page(dev, page, offset, size, dir, attrs);
> -	if (!is_device_dma_coherent(dev) &&
> -	    (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
> -		__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
> -
> -	return dev_addr;
> -}
> -
> -
> -static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
> -				 size_t size, enum dma_data_direction dir,
> -				 unsigned long attrs)
> +void arch_dma_free(struct device *dev, size_t size, void *vaddr,
> +		dma_addr_t dma_handle, unsigned long attrs)
>   {
> -	if (!is_device_dma_coherent(dev) &&
> -	    (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
> -		__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
> -	swiotlb_unmap_page(dev, dev_addr, size, dir, attrs);
> +	if (__free_from_pool(vaddr, PAGE_ALIGN(size)))
> +		return;
> +	vunmap(vaddr);
> +	dma_direct_free_pages(dev, size, vaddr, dma_handle, attrs);
>   }
>   
> -static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
> -				  int nelems, enum dma_data_direction dir,
> -				  unsigned long attrs)
> +long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,

I realise I'm spotting this a bit late, but does this interface really 
need somewhat-atypical signed PFNs?

> +		dma_addr_t dma_addr)
>   {
> -	struct scatterlist *sg;
> -	int i, ret;
> -
> -	ret = swiotlb_map_sg_attrs(dev, sgl, nelems, dir, attrs);
> -	if (!is_device_dma_coherent(dev) &&
> -	    (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
> -		for_each_sg(sgl, sg, ret, i)
> -			__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
> -				       sg->length, dir);
> -
> -	return ret;
> +	return __phys_to_pfn(dma_to_phys(dev, dma_addr));
>   }
>   
> -static void __swiotlb_unmap_sg_attrs(struct device *dev,
> -				     struct scatterlist *sgl, int nelems,
> -				     enum dma_data_direction dir,
> -				     unsigned long attrs)
> +pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
> +		unsigned long attrs)
>   {
> -	struct scatterlist *sg;
> -	int i;
> -
> -	if (!is_device_dma_coherent(dev) &&
> -	    (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
> -		for_each_sg(sgl, sg, nelems, i)
> -			__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
> -					 sg->length, dir);
> -	swiotlb_unmap_sg_attrs(dev, sgl, nelems, dir, attrs);
> +	if (!dev_is_dma_coherent(dev) || (attrs & DMA_ATTR_WRITE_COMBINE))
> +		return pgprot_writecombine(prot);
> +	return prot;
>   }
>   
> -static void __swiotlb_sync_single_for_cpu(struct device *dev,
> -					  dma_addr_t dev_addr, size_t size,
> -					  enum dma_data_direction dir)
> +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
> +		size_t size, enum dma_data_direction dir)
>   {
> -	if (!is_device_dma_coherent(dev))
> -		__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
> -	swiotlb_sync_single_for_cpu(dev, dev_addr, size, dir);
> +	__dma_map_area(phys_to_virt(paddr), size, dir);
>   }
>   
> -static void __swiotlb_sync_single_for_device(struct device *dev,
> -					     dma_addr_t dev_addr, size_t size,
> -					     enum dma_data_direction dir)
> +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
> +		size_t size, enum dma_data_direction dir)
>   {
> -	swiotlb_sync_single_for_device(dev, dev_addr, size, dir);
> -	if (!is_device_dma_coherent(dev))
> -		__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
> +	__dma_unmap_area(phys_to_virt(paddr), size, dir);
>   }
>   
> -static void __swiotlb_sync_sg_for_cpu(struct device *dev,
> -				      struct scatterlist *sgl, int nelems,
> -				      enum dma_data_direction dir)
> +static int __swiotlb_get_sgtable_page(struct sg_table *sgt,
> +				      struct page *page, size_t size)

If __iommu_get_sgtable() is now the only user, I'd say just inline these 
remnants there (or let that case call dma_common_sgtable() if that's 
what swiotlb_dma_ops are now relying on). Either way the "__swiotlb" is 
now a complete misnomer.

Other than that, and the aforementioned fixing of arch_dma_free(), it 
seems OK and has survived at least some light testing:

Reviewed-by: Robin Murphy <robin.murphy@....com>

Thanks,
Robin.

>   {
> -	struct scatterlist *sg;
> -	int i;
> -
> -	if (!is_device_dma_coherent(dev))
> -		for_each_sg(sgl, sg, nelems, i)
> -			__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
> -					 sg->length, dir);
> -	swiotlb_sync_sg_for_cpu(dev, sgl, nelems, dir);
> -}
> +	int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
>   
> -static void __swiotlb_sync_sg_for_device(struct device *dev,
> -					 struct scatterlist *sgl, int nelems,
> -					 enum dma_data_direction dir)
> -{
> -	struct scatterlist *sg;
> -	int i;
> +	if (!ret)
> +		sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
>   
> -	swiotlb_sync_sg_for_device(dev, sgl, nelems, dir);
> -	if (!is_device_dma_coherent(dev))
> -		for_each_sg(sgl, sg, nelems, i)
> -			__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
> -				       sg->length, dir);
> +	return ret;
>   }
>   
>   static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
> @@ -277,74 +187,6 @@ static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
>   	return ret;
>   }
>   
> -static int __swiotlb_mmap(struct device *dev,
> -			  struct vm_area_struct *vma,
> -			  void *cpu_addr, dma_addr_t dma_addr, size_t size,
> -			  unsigned long attrs)
> -{
> -	int ret;
> -	unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT;
> -
> -	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot,
> -					     is_device_dma_coherent(dev));
> -
> -	if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
> -		return ret;
> -
> -	return __swiotlb_mmap_pfn(vma, pfn, size);
> -}
> -
> -static int __swiotlb_get_sgtable_page(struct sg_table *sgt,
> -				      struct page *page, size_t size)
> -{
> -	int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
> -
> -	if (!ret)
> -		sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
> -
> -	return ret;
> -}
> -
> -static int __swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
> -				 void *cpu_addr, dma_addr_t handle, size_t size,
> -				 unsigned long attrs)
> -{
> -	struct page *page = phys_to_page(dma_to_phys(dev, handle));
> -
> -	return __swiotlb_get_sgtable_page(sgt, page, size);
> -}
> -
> -static int __swiotlb_dma_supported(struct device *hwdev, u64 mask)
> -{
> -	if (swiotlb)
> -		return swiotlb_dma_supported(hwdev, mask);
> -	return 1;
> -}
> -
> -static int __swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t addr)
> -{
> -	if (swiotlb)
> -		return dma_direct_mapping_error(hwdev, addr);
> -	return 0;
> -}
> -
> -static const struct dma_map_ops arm64_swiotlb_dma_ops = {
> -	.alloc = __dma_alloc,
> -	.free = __dma_free,
> -	.mmap = __swiotlb_mmap,
> -	.get_sgtable = __swiotlb_get_sgtable,
> -	.map_page = __swiotlb_map_page,
> -	.unmap_page = __swiotlb_unmap_page,
> -	.map_sg = __swiotlb_map_sg_attrs,
> -	.unmap_sg = __swiotlb_unmap_sg_attrs,
> -	.sync_single_for_cpu = __swiotlb_sync_single_for_cpu,
> -	.sync_single_for_device = __swiotlb_sync_single_for_device,
> -	.sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu,
> -	.sync_sg_for_device = __swiotlb_sync_sg_for_device,
> -	.dma_supported = __swiotlb_dma_supported,
> -	.mapping_error = __swiotlb_dma_mapping_error,
> -};
> -
>   static int __init atomic_pool_init(void)
>   {
>   	pgprot_t prot = __pgprot(PROT_NORMAL_NC);
> @@ -500,10 +342,6 @@ EXPORT_SYMBOL(dummy_dma_ops);
>   
>   static int __init arm64_dma_init(void)
>   {
> -	if (swiotlb_force == SWIOTLB_FORCE ||
> -	    max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT))
> -		swiotlb = 1;
> -
>   	WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
>   		   TAINT_CPU_OUT_OF_SPEC,
>   		   "ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
> @@ -528,7 +366,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
>   				 dma_addr_t *handle, gfp_t gfp,
>   				 unsigned long attrs)
>   {
> -	bool coherent = is_device_dma_coherent(dev);
> +	bool coherent = dev_is_dma_coherent(dev);
>   	int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
>   	size_t iosize = size;
>   	void *addr;
> @@ -569,7 +407,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
>   			addr = NULL;
>   		}
>   	} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
> -		pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent);
> +		pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
>   		struct page *page;
>   
>   		page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
> @@ -596,7 +434,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
>   						    size >> PAGE_SHIFT);
>   		}
>   	} else {
> -		pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent);
> +		pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
>   		struct page **pages;
>   
>   		pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
> @@ -658,8 +496,7 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
>   	struct vm_struct *area;
>   	int ret;
>   
> -	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot,
> -					     is_device_dma_coherent(dev));
> +	vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs);
>   
>   	if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
>   		return ret;
> @@ -709,11 +546,11 @@ static void __iommu_sync_single_for_cpu(struct device *dev,
>   {
>   	phys_addr_t phys;
>   
> -	if (is_device_dma_coherent(dev))
> +	if (dev_is_dma_coherent(dev))
>   		return;
>   
>   	phys = iommu_iova_to_phys(iommu_get_domain_for_dev(dev), dev_addr);
> -	__dma_unmap_area(phys_to_virt(phys), size, dir);
> +	arch_sync_dma_for_cpu(dev, phys, size, dir);
>   }
>   
>   static void __iommu_sync_single_for_device(struct device *dev,
> @@ -722,11 +559,11 @@ static void __iommu_sync_single_for_device(struct device *dev,
>   {
>   	phys_addr_t phys;
>   
> -	if (is_device_dma_coherent(dev))
> +	if (dev_is_dma_coherent(dev))
>   		return;
>   
>   	phys = iommu_iova_to_phys(iommu_get_domain_for_dev(dev), dev_addr);
> -	__dma_map_area(phys_to_virt(phys), size, dir);
> +	arch_sync_dma_for_device(dev, phys, size, dir);
>   }
>   
>   static dma_addr_t __iommu_map_page(struct device *dev, struct page *page,
> @@ -734,7 +571,7 @@ static dma_addr_t __iommu_map_page(struct device *dev, struct page *page,
>   				   enum dma_data_direction dir,
>   				   unsigned long attrs)
>   {
> -	bool coherent = is_device_dma_coherent(dev);
> +	bool coherent = dev_is_dma_coherent(dev);
>   	int prot = dma_info_to_prot(dir, coherent, attrs);
>   	dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot);
>   
> @@ -762,11 +599,11 @@ static void __iommu_sync_sg_for_cpu(struct device *dev,
>   	struct scatterlist *sg;
>   	int i;
>   
> -	if (is_device_dma_coherent(dev))
> +	if (dev_is_dma_coherent(dev))
>   		return;
>   
>   	for_each_sg(sgl, sg, nelems, i)
> -		__dma_unmap_area(sg_virt(sg), sg->length, dir);
> +		arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
>   }
>   
>   static void __iommu_sync_sg_for_device(struct device *dev,
> @@ -776,18 +613,18 @@ static void __iommu_sync_sg_for_device(struct device *dev,
>   	struct scatterlist *sg;
>   	int i;
>   
> -	if (is_device_dma_coherent(dev))
> +	if (dev_is_dma_coherent(dev))
>   		return;
>   
>   	for_each_sg(sgl, sg, nelems, i)
> -		__dma_map_area(sg_virt(sg), sg->length, dir);
> +		arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
>   }
>   
>   static int __iommu_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
>   				int nelems, enum dma_data_direction dir,
>   				unsigned long attrs)
>   {
> -	bool coherent = is_device_dma_coherent(dev);
> +	bool coherent = dev_is_dma_coherent(dev);
>   
>   	if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
>   		__iommu_sync_sg_for_device(dev, sgl, nelems, dir);
> @@ -879,9 +716,9 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>   			const struct iommu_ops *iommu, bool coherent)
>   {
>   	if (!dev->dma_ops)
> -		dev->dma_ops = &arm64_swiotlb_dma_ops;
> +		dev->dma_ops = &swiotlb_dma_ops;
>   
> -	dev->archdata.dma_coherent = coherent;
> +	dev->dma_coherent = coherent;
>   	__iommu_setup_dma_ops(dev, dma_base, size, iommu);
>   
>   #ifdef CONFIG_XEN
> 

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