linux-kernel - Re: [PATCH v14 06/12] swiotlb: Use is_swiotlb_force

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Date:   Thu, 24 Jun 2021 23:58:57 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     Qian Cai <quic_qiancai@...cinc.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>,
        Frank Rowand <frowand.list@...il.com>,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        heikki.krogerus@...ux.intel.com, thomas.hellstrom@...ux.intel.com,
        peterz@...radead.org, benh@...nel.crashing.org,
        joonas.lahtinen@...ux.intel.com, dri-devel@...ts.freedesktop.org,
        chris@...is-wilson.co.uk, grant.likely@....com, paulus@...ba.org,
        mingo@...nel.org, Jianxiong Gao <jxgao@...gle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>, xypron.glpk@....de,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        bskeggs@...hat.com, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org,
        Thierry Reding <treding@...dia.com>,
        intel-gfx@...ts.freedesktop.org, matthew.auld@...el.com,
        linux-devicetree <devicetree@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>, airlied@...ux.ie,
        maarten.lankhorst@...ux.intel.com, linuxppc-dev@...ts.ozlabs.org,
        jani.nikula@...ux.intel.com,
        Nicolas Boichat <drinkcat@...omium.org>,
        rodrigo.vivi@...el.com, Bjorn Helgaas <bhelgaas@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Tom Lendacky <thomas.lendacky@....com>, bauerman@...ux.ibm.com
Subject: Re: [PATCH v14 06/12] swiotlb: Use is_swiotlb_force_bounce for
 swiotlb data bouncing

On Thu, Jun 24, 2021 at 11:56 PM Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
>
> On Thu, Jun 24, 2021 at 10:10:51AM -0400, Qian Cai wrote:
> >
> >
> > On 6/24/2021 7:48 AM, Will Deacon wrote:
> > > Ok, diff below which attempts to tackle the offset issue I mentioned as
> > > well. Qian Cai -- please can you try with these changes?
> >
> > This works fine.
>
> Cool. Let me squash this patch in #6 and rebase the rest of them.
>
> Claire, could you check the devel/for-linus-5.14 say by end of today to
> double check that I didn't mess anything up please?

I just submitted v15 here
(https://lore.kernel.org/patchwork/cover/1451322/) in case it's
helpful.
I'll double check of course. Thanks for the efforts!

>
> Will,
>
> Thank you for generating the fix! I am going to run it on x86 and Xen
> to make sure all is good (granted last time I ran devel/for-linus-5.14
> on that setup I didn't see any errors so I need to double check
> I didn't do something silly like run a wrong kernel).
>
>
> >
> > >
> > > Will
> > >
> > > --->8
> > >
> > > diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> > > index 175b6c113ed8..39284ff2a6cd 100644
> > > --- a/include/linux/swiotlb.h
> > > +++ b/include/linux/swiotlb.h
> > > @@ -116,7 +116,9 @@ static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
> > >
> > >  static inline bool is_swiotlb_force_bounce(struct device *dev)
> > >  {
> > > -       return dev->dma_io_tlb_mem->force_bounce;
> > > +       struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
> > > +
> > > +       return mem && mem->force_bounce;
> > >  }
> > >
> > >  void __init swiotlb_exit(void);
> > > diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> > > index 44be8258e27b..0ffbaae9fba2 100644
> > > --- a/kernel/dma/swiotlb.c
> > > +++ b/kernel/dma/swiotlb.c
> > > @@ -449,6 +449,7 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
> > >                 dma_get_min_align_mask(dev) & ~(IO_TLB_SIZE - 1);
> > >         unsigned int nslots = nr_slots(alloc_size), stride;
> > >         unsigned int index, wrap, count = 0, i;
> > > +       unsigned int offset = swiotlb_align_offset(dev, orig_addr);
> > >         unsigned long flags;
> > >
> > >         BUG_ON(!nslots);
> > > @@ -497,7 +498,7 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
> > >         for (i = index; i < index + nslots; i++) {
> > >                 mem->slots[i].list = 0;
> > >                 mem->slots[i].alloc_size =
> > > -                       alloc_size - ((i - index) << IO_TLB_SHIFT);
> > > +                       alloc_size - (offset + ((i - index) << IO_TLB_SHIFT));
> > >         }
> > >         for (i = index - 1;
> > >              io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
> > >