Subject: Re: [PATCH v3 12/18] powerpc/iommu: Fix missing permission bits in iommu_put_tce_user_mode()

From: Benjamin Herrenschmidt <[email-masked]>
Date: Mon, 28 Jul 2014 14:35:34 +1000

On Mon, 2014-07-28 at 14:32 +1000, Alexey Kardashevskiy wrote:
> On 07/28/2014 11:19 AM, Benjamin Herrenschmidt wrote:
> > On Thu, 2014-07-24 at 18:48 +1000, Alexey Kardashevskiy wrote:
> >> This adds missing permission bits to the translated TCE.
> > 
> > Is this a bug fix for existing stuff ? If yes, submit it separately.
> 
> 
> There is 15/18 patch which fixes possible bug with leaking pages, and that
> patch won't work until this one is applied.

Please collapse them then.

> Merge this one and "[PATCH v3 15/18] powerpc/iommu: Implement put_page() if
> TCE had non-zero value"?

Right, and if the result is a bug fix on top of something already
upstream, please send it separately.

Cheers,
Ben.

> 
> 
> > 
> >> Signed-off-by: Alexey Kardashevskiy <[email-masked]>
> >> ---
> >>  arch/powerpc/kernel/iommu.c | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
> >> index 0cda2e8..5af2319 100644
> >> --- a/arch/powerpc/kernel/iommu.c
> >> +++ b/arch/powerpc/kernel/iommu.c
> >> @@ -1088,6 +1088,7 @@ int iommu_put_tce_user_mode(struct iommu_table *tbl, unsigned long entry,
> >>  		return -EFAULT;
> >>  	}
> >>  	hwaddr = (unsigned long) page_address(page) + offset;
> >> +	hwaddr |= tce & (TCE_PCI_READ | TCE_PCI_WRITE);
> >>  
> >>  	ret = iommu_tce_build(tbl, entry, hwaddr, direction);
> >>  	if (ret)
> > 
> > 
> 
>