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Date:   Thu, 17 Jun 2021 16:30:59 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@kernel.org>
To:     Claire Chang <tientzu@chromium.org>
cc:     Rob Herring <robh+dt@kernel.org>, mpe@ellerman.id.au,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
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Subject: Re: [PATCH v13 05/12] swiotlb: Update is_swiotlb_active to add a
 struct device argument
In-Reply-To: <20210617062635.1660944-6-tientzu@chromium.org>
Message-ID: <alpine.DEB.2.21.2106171448050.24906@sstabellini-ThinkPad-T480s>
References: <20210617062635.1660944-1-tientzu@chromium.org> <20210617062635.1660944-6-tientzu@chromium.org>
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Precedence: bulk

On Thu, 17 Jun 2021, Claire Chang wrote:
> Update is_swiotlb_active to add a struct device argument. This will be
> useful later to allow for different pools.
> 
> Signed-off-by: Claire Chang <tientzu@chromium.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Tested-by: Stefano Stabellini <sstabellini@kernel.org>
> Tested-by: Will Deacon <will@kernel.org>

Acked-by: Stefano Stabellini <sstabellini@kernel.org>


> ---
>  drivers/gpu/drm/i915/gem/i915_gem_internal.c | 2 +-
>  drivers/gpu/drm/nouveau/nouveau_ttm.c        | 2 +-
>  drivers/pci/xen-pcifront.c                   | 2 +-
>  include/linux/swiotlb.h                      | 4 ++--
>  kernel/dma/direct.c                          | 2 +-
>  kernel/dma/swiotlb.c                         | 4 ++--
>  6 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_internal.c b/drivers/gpu/drm/i915/gem/i915_gem_internal.c
> index a9d65fc8aa0e..4b7afa0fc85d 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_internal.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_internal.c
> @@ -42,7 +42,7 @@ static int i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj)
>  
>  	max_order = MAX_ORDER;
>  #ifdef CONFIG_SWIOTLB
> -	if (is_swiotlb_active()) {
> +	if (is_swiotlb_active(obj->base.dev->dev)) {
>  		unsigned int max_segment;
>  
>  		max_segment = swiotlb_max_segment();
> diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c b/drivers/gpu/drm/nouveau/nouveau_ttm.c
> index 9662522aa066..be15bfd9e0ee 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
> @@ -321,7 +321,7 @@ nouveau_ttm_init(struct nouveau_drm *drm)
>  	}
>  
>  #if IS_ENABLED(CONFIG_SWIOTLB) && IS_ENABLED(CONFIG_X86)
> -	need_swiotlb = is_swiotlb_active();
> +	need_swiotlb = is_swiotlb_active(dev->dev);
>  #endif
>  
>  	ret = ttm_bo_device_init(&drm->ttm.bdev, &nouveau_bo_driver,
> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
> index b7a8f3a1921f..0d56985bfe81 100644
> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c
> @@ -693,7 +693,7 @@ static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
>  
>  	spin_unlock(&pcifront_dev_lock);
>  
> -	if (!err && !is_swiotlb_active()) {
> +	if (!err && !is_swiotlb_active(&pdev->xdev->dev)) {
>  		err = pci_xen_swiotlb_init_late();
>  		if (err)
>  			dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n");
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index d1f3d95881cd..dd1c30a83058 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -112,7 +112,7 @@ static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
>  void __init swiotlb_exit(void);
>  unsigned int swiotlb_max_segment(void);
>  size_t swiotlb_max_mapping_size(struct device *dev);
> -bool is_swiotlb_active(void);
> +bool is_swiotlb_active(struct device *dev);
>  void __init swiotlb_adjust_size(unsigned long size);
>  #else
>  #define swiotlb_force SWIOTLB_NO_FORCE
> @@ -132,7 +132,7 @@ static inline size_t swiotlb_max_mapping_size(struct device *dev)
>  	return SIZE_MAX;
>  }
>  
> -static inline bool is_swiotlb_active(void)
> +static inline bool is_swiotlb_active(struct device *dev)
>  {
>  	return false;
>  }
> diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
> index 84c9feb5474a..7a88c34d0867 100644
> --- a/kernel/dma/direct.c
> +++ b/kernel/dma/direct.c
> @@ -495,7 +495,7 @@ int dma_direct_supported(struct device *dev, u64 mask)
>  size_t dma_direct_max_mapping_size(struct device *dev)
>  {
>  	/* If SWIOTLB is active, use its maximum mapping size */
> -	if (is_swiotlb_active() &&
> +	if (is_swiotlb_active(dev) &&
>  	    (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE))
>  		return swiotlb_max_mapping_size(dev);
>  	return SIZE_MAX;
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index de79e9437030..409694d7a8ad 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -664,9 +664,9 @@ size_t swiotlb_max_mapping_size(struct device *dev)
>  	return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE;
>  }
>  
> -bool is_swiotlb_active(void)
> +bool is_swiotlb_active(struct device *dev)
>  {
> -	return io_tlb_default_mem != NULL;
> +	return dev->dma_io_tlb_mem != NULL;
>  }
>  EXPORT_SYMBOL_GPL(is_swiotlb_active);
>  
> -- 
> 2.32.0.288.g62a8d224e6-goog
>