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From: Thomas Monjalon <thomas@monjalon.net>
To: David Christensen <drc@linux.vnet.ibm.com>
Cc: dev@dpdk.org, anatoly.burakov@intel.com, david.marchand@redhat.com
Subject: Re: [dpdk-dev] [PATCH v5 1/1] vfio: modify spapr iommu support to use static window sizing
Date: Sat, 07 Nov 2020 10:58:06 +0100
Message-ID: <3249543.eK2paozH6B@thomas> (raw)
In-Reply-To: <c5f3d979-e944-9db0-c8c4-8a56637002d9@linux.vnet.ibm.com>

06/11/2020 23:16, David Christensen:
> On 11/4/20 11:12 PM, Thomas Monjalon wrote:
> > 04/11/2020 23:25, David Christensen:
> >> On 11/4/20 1:02 PM, Thomas Monjalon wrote:
> >>> 04/11/2020 22:00, David Christensen:
> >>>> On 11/4/20 11:43 AM, Thomas Monjalon wrote:
> >>>>>> Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
> >>>>>> Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
> >>>>>> ---
> >>>>>> -#ifdef VFIO_IOMMU_SPAPR_INFO_DDW
> >>>>>> -		/* try possible page_shift and levels for workaround */
> >>>>>> +		/* if at first we don't succeed, try more levels */
> >>>>>>     		uint32_t levels;
> >>>>>>     
> >>>>>> -		for (levels = create->levels + 1;
> >>>>>> +		for (levels = create.levels + 1;
> >>>>>>     			ret && levels <= info.ddw.levels; levels++) {
> >>>>>
> >>>>> There is a compilation failure with ppc64le-power8-linux-gcc:
> >>>>> error: ‘struct vfio_iommu_spapr_tce_info’ has no member named ‘ddw’
> >>>>
> >>>> How did you find that error?  It builds locally for me on a POWER system
> >>>> with Meson/gcc and there were no build failures on Travis
> >>>> (https://travis-ci.com/github/drchristensen/dpdk/builds/198047029) when
> >>>> I checked it against AMD64/ARM systems.  The code is PPC specific but it
> >>>> will build on all architectures (there are no IFDEFs around it).
> >>>
> >>> Remember, I cross-build with test-meson-builds.sh
> >>> Is it an issue of my toolchain?
> >>
> >> What distro/gcc version are you using?  I'll try it locally on an x86.
> > 
> > I am using powerpc64le-power8--glibc--stable-2018.11-1 from
> > https://toolchains.bootlin.com/releases_powerpc64le-power8.html
> 
> Here's what I found:
> 
> - Builds correctly on a RHEL 8.2 POWER9 host with gcc (GCC) 8.3.1 
> 20191121 (Red Hat 8.3.1-5) and kernel 4.18.0
> - Builds correctly on an Ubuntu 18.04.5 POWER9 host with gcc (Ubuntu 
> 7.5.0-3ubuntu1~18.04) 7.5.0 and kernel 4.15.0.
> - Build fails on an Ubuntu 18.04.5 AMD64 host with your POWER8 toolchain 
> and the devtools/test-meson-builds.sh script.
> 
> It appears that the VFIO header file in your toolchain:
> 
> powerpc64le-buildroot-linux-gnu/sysroot/usr/include/linux/vfio.h
> 
> is from the 4.1.49 kernel, but the sPAPR v2 IOMMU support wasn't added 
> until the 4.2.0 kernel (https://lkml.org/lkml/2015/4/25/56).  The update 
> added the ddw member to the vfio_iommu_spapr_tce_info structure.  I'll 
> submit a new patch which skips testing additional levels unless kernel 
> 4.2.0 or later is used.

Instead of testing kernel version, which is fragile with backports,
can you test the presence of the feature itself?
If no macro (usable with #ifdef) is defined with the feature,
checking the kernel version is acceptable.



  reply	other threads:[~2020-11-07  9:58 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-29 23:29 [dpdk-dev] [PATCH 0/2] vfio: change spapr DMA window sizing operation David Christensen
2020-04-29 23:29 ` [dpdk-dev] [PATCH 1/2] vfio: use ifdef's for ppc64 spapr code David Christensen
2020-04-30 11:14   ` Burakov, Anatoly
2020-04-30 16:22     ` David Christensen
2020-04-30 16:24       ` Burakov, Anatoly
2020-04-30 17:38         ` David Christensen
2020-05-01  8:49           ` Burakov, Anatoly
2020-04-29 23:29 ` [dpdk-dev] [PATCH 2/2] vfio: modify spapr iommu support to use static window sizing David Christensen
2020-04-30 11:34   ` Burakov, Anatoly
2020-04-30 17:36     ` David Christensen
2020-05-01  9:06       ` Burakov, Anatoly
2020-05-01 16:48         ` David Christensen
2020-05-05 14:57           ` Burakov, Anatoly
2020-05-05 16:26             ` David Christensen
2020-05-06 10:18               ` Burakov, Anatoly
2020-06-30 21:38 ` [dpdk-dev] [PATCH v2 0/1] vfio: change spapr DMA window sizing operation David Christensen
2020-06-30 21:38   ` [dpdk-dev] [PATCH v2 1/1] vfio: modify spapr iommu support to use static window sizing David Christensen
2020-08-10 21:07   ` [dpdk-dev] [PATCH v3 0/1] vfio: change spapr DMA window sizing operation David Christensen
2020-08-10 21:07     ` [dpdk-dev] [PATCH v3 1/1] vfio: modify spapr iommu support to use static window sizing David Christensen
2020-09-03 18:55       ` David Christensen
2020-09-17 11:13       ` Burakov, Anatoly
2020-10-07 12:49         ` Thomas Monjalon
2020-10-07 17:44         ` David Christensen
2020-10-08  9:39           ` Burakov, Anatoly
2020-10-12 19:19             ` David Christensen
2020-10-14  9:27               ` Burakov, Anatoly
2020-10-15 17:23     ` [dpdk-dev] [PATCH v4 0/1] vfio: change spapr DMA window sizing operation David Christensen
2020-10-15 17:23       ` [dpdk-dev] [PATCH v4 1/1] vfio: modify spapr iommu support to use static window sizing David Christensen
2020-10-20 12:05         ` Thomas Monjalon
2020-10-29 21:30           ` Thomas Monjalon
2020-11-02 11:04         ` Burakov, Anatoly
2020-11-03 22:05       ` [dpdk-dev] [PATCH v5 0/1] " David Christensen
2020-11-03 22:05         ` [dpdk-dev] [PATCH v5 1/1] " David Christensen
2020-11-04 19:43           ` Thomas Monjalon
2020-11-04 21:00             ` David Christensen
2020-11-04 21:02               ` Thomas Monjalon
2020-11-04 22:25                 ` David Christensen
2020-11-05  7:12                   ` Thomas Monjalon
2020-11-06 22:16                     ` David Christensen
2020-11-07  9:58                       ` Thomas Monjalon [this message]
2020-11-09 20:35         ` [dpdk-dev] [PATCH v5 0/1] " David Christensen
2020-11-09 20:35           ` [dpdk-dev] [PATCH v6 1/1] " David Christensen
2020-11-09 21:10             ` Thomas Monjalon
2020-11-10 17:41           ` [dpdk-dev] [PATCH v7 0/1] " David Christensen
2020-11-10 17:41             ` [dpdk-dev] [PATCH v7 1/1] " David Christensen
2020-11-10 17:43           ` [dpdk-dev] [PATCH v7 0/1] " David Christensen
2020-11-10 17:43             ` [dpdk-dev] [PATCH v7 1/1] " David Christensen
2020-11-13  8:39               ` Thomas Monjalon

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