linux-kernel - Re: [PATCH] ARM64: dma: move swiotlb helpers under CONFIG_IOMMU

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Date:   Thu, 1 Nov 2018 12:05:46 -0700
From:   Olof Johansson <olof@...om.net>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM64: dma: move swiotlb helpers under CONFIG_IOMMU_DMA

On Thu, Nov 1, 2018 at 12:03 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>
> On 11/1/18 11:53 AM, Olof Johansson wrote:
> > Fixes the following tinyconfig warnings:
> > arch/arm64/mm/dma-mapping.c:174:12: warning: '__swiotlb_mmap_pfn' defined but not used [-Wunused-function]
> > arch/arm64/mm/dma-mapping.c:163:12: warning: '__swiotlb_get_sgtable_page' defined but not used [-Wunused-function]
> >
> > Signed-off-by: Olof Johansson <olof@...om.net>
>
> Christoph sent an alternative solution here:
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2018-October/609480.html

Thanks!

This was my bad, I searched for the symbols before posting but missed
that thread. Either patch is fine with me.


-Olof
>
> > ---
> >  arch/arm64/mm/dma-mapping.c | 58 ++++++++++++++++++++++-----------------------
> >  1 file changed, 29 insertions(+), 29 deletions(-)
> >
> > diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> > index 3a703e5d4e32..62356c64e180 100644
> > --- a/arch/arm64/mm/dma-mapping.c
> > +++ b/arch/arm64/mm/dma-mapping.c
> > @@ -160,35 +160,6 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
> >       __dma_unmap_area(phys_to_virt(paddr), size, dir);
> >  }
> >
> > -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_mmap_pfn(struct vm_area_struct *vma,
> > -                           unsigned long pfn, size_t size)
> > -{
> > -     int ret = -ENXIO;
> > -     unsigned long nr_vma_pages = vma_pages(vma);
> > -     unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
> > -     unsigned long off = vma->vm_pgoff;
> > -
> > -     if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
> > -             ret = remap_pfn_range(vma, vma->vm_start,
> > -                                   pfn + off,
> > -                                   vma->vm_end - vma->vm_start,
> > -                                   vma->vm_page_prot);
> > -     }
> > -
> > -     return ret;
> > -}
> > -
> >  static int __init atomic_pool_init(void)
> >  {
> >       pgprot_t prot = __pgprot(PROT_NORMAL_NC);
> > @@ -358,6 +329,35 @@ arch_initcall(arm64_dma_init);
> >  #include <linux/platform_device.h>
> >  #include <linux/amba/bus.h>
> >
> > +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_mmap_pfn(struct vm_area_struct *vma,
> > +                           unsigned long pfn, size_t size)
> > +{
> > +     int ret = -ENXIO;
> > +     unsigned long nr_vma_pages = vma_pages(vma);
> > +     unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
> > +     unsigned long off = vma->vm_pgoff;
> > +
> > +     if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
> > +             ret = remap_pfn_range(vma, vma->vm_start,
> > +                                   pfn + off,
> > +                                   vma->vm_end - vma->vm_start,
> > +                                   vma->vm_page_prot);
> > +     }
> > +
> > +     return ret;
> > +}
> > +
> >  /* Thankfully, all cache ops are by VA so we can ignore phys here */
> >  static void flush_page(struct device *dev, const void *virt, phys_addr_t phys)
> >  {
> >
>
>
> --
> Florian