From: Leonardo Bras <leobras.c@gmail.com>
To: Alexey Kardashevskiy <aik@ozlabs.ru>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>,
Ram Pai <linuxram@us.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] powerpc/pseries/iommu: Remove default DMA window before creating DDW
Date: Mon, 22 Jun 2020 23:43:24 -0300 [thread overview]
Message-ID: <03e82e1a1bcf516d01ca472546d8b31e468aba8b.camel@gmail.com> (raw)
In-Reply-To: <cfb197e1-c608-71f9-5c98-c120a3496266@ozlabs.ru>
On Tue, 2020-06-23 at 12:35 +1000, Alexey Kardashevskiy wrote:
> > I am not sure if this is true in general, but in this device (SR-IOV
> > VF) I am testing it will return 0 windows if the default DMA window is
> > not deleted, and 1 after it's deleted.
>
> Since pHyp can only create windows in "64bit space", now (I did not know
> until a few month back) I expect that thing to return "1" always no
> matter what happened to the default window. And removing the default
> window will only affect the maximum number of TCEs but not the number of
> possible windows.
Humm, something gone wrong then.
This patchset was developed mostly because on testing, DDW would never
be created because windows_available would always be 0.
I will take a deeper look in that.
Best regards,
Leonardo
next prev parent reply other threads:[~2020-06-23 2:43 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 5:06 [PATCH 0/4] Remove default DMA window before creating DDW Leonardo Bras
2020-06-19 5:06 ` [PATCH 1/4] powerpc/pseries/iommu: Update call to ibm,query-pe-dma-windows Leonardo Bras
2020-06-22 10:02 ` Alexey Kardashevskiy
2020-06-22 18:58 ` Leonardo Bras
2020-06-23 1:12 ` Alexey Kardashevskiy
2020-06-23 2:14 ` Leonardo Bras
2020-06-23 2:29 ` Alexey Kardashevskiy
2020-06-19 5:06 ` [PATCH 2/4] powerpc/pseries/iommu: Implement ibm,reset-pe-dma-windows rtas call Leonardo Bras
2020-06-22 10:02 ` Alexey Kardashevskiy
2020-06-22 18:58 ` Leonardo Bras
2020-06-23 1:11 ` Alexey Kardashevskiy
2020-06-23 2:20 ` Leonardo Bras
2020-06-19 5:06 ` [PATCH 3/4] powerpc/pseries/iommu: Move window-removing part of remove_ddw into remove_dma_window Leonardo Bras
2020-06-22 10:02 ` Alexey Kardashevskiy
2020-06-22 18:59 ` Leonardo Bras
2020-06-23 1:12 ` Alexey Kardashevskiy
2020-06-23 1:33 ` Oliver O'Halloran
2020-06-23 2:26 ` Leonardo Bras
2020-06-23 2:22 ` Leonardo Bras
2020-06-19 5:06 ` [PATCH 4/4] powerpc/pseries/iommu: Remove default DMA window before creating DDW Leonardo Bras
2020-06-20 6:13 ` kernel test robot
2020-06-22 10:02 ` Alexey Kardashevskiy
2020-06-22 18:59 ` Leonardo Bras
2020-06-23 1:11 ` Alexey Kardashevskiy
2020-06-23 2:31 ` Leonardo Bras
2020-06-23 2:35 ` Alexey Kardashevskiy
2020-06-23 2:43 ` Leonardo Bras [this message]
2020-06-23 3:52 ` Alexey Kardashevskiy
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