Re: remove the nvlink2 pci_vfio subdriver

Re: remove the nvlink2 pci_vfio subdriver

[Greg Kroah-Hartman]

On Mon, Mar 22, 2021 at 04:01:53PM +0100, Christoph Hellwig wrote:
> Hi all,
> 
> the nvlink2 vfio subdriver is a weird beast.  It supports a hardware
> feature without any open source component - what would normally be
> the normal open source userspace that we require for kernel drivers,
> although in this particular case user space could of course be a
> kernel driver in a VM.  It also happens to be a complete mess that
> does not properly bind to PCI IDs, is hacked into the vfio_pci driver
> and also pulles in over 1000 lines of code always build into powerpc
> kernels that have Power NV support enabled.  Because of all these
> issues and the lack of breaking userspace when it is removed I think
> the best idea is to simply kill.
> 
> Diffstat:
>  arch/powerpc/platforms/powernv/npu-dma.c     |  705 ---------------------------
>  b/arch/powerpc/include/asm/opal.h            |    3 
>  b/arch/powerpc/include/asm/pci-bridge.h      |    1 
>  b/arch/powerpc/include/asm/pci.h             |    7 
>  b/arch/powerpc/platforms/powernv/Makefile    |    2 
>  b/arch/powerpc/platforms/powernv/opal-call.c |    2 
>  b/arch/powerpc/platforms/powernv/pci-ioda.c  |  185 -------
>  b/arch/powerpc/platforms/powernv/pci.c       |   11 
>  b/arch/powerpc/platforms/powernv/pci.h       |   17 
>  b/arch/powerpc/platforms/pseries/pci.c       |   23 
>  b/drivers/vfio/pci/Kconfig                   |    6 
>  b/drivers/vfio/pci/Makefile                  |    1 
>  b/drivers/vfio/pci/vfio_pci.c                |   18 
>  b/drivers/vfio/pci/vfio_pci_private.h        |   14 
>  b/include/uapi/linux/vfio.h                  |   40 -
>  drivers/vfio/pci/vfio_pci_nvlink2.c          |  490 ------------------
>  16 files changed, 8 insertions(+), 1517 deletions(-)

I thought this was supposed to be removed a few years ago!

Anyway, no objection from me:

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Re: [PATCH 1/2] vfio/pci: remove vfio_pci_nvlink2

[Alex Williamson]

On Mon, 22 Mar 2021 16:01:54 +0100
Christoph Hellwig <hch@lst.de> wrote:
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 8ce36c1d53ca11..db7e782419d5d9 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -332,19 +332,6 @@ struct vfio_region_info_cap_type {
>  #define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG	(2)
>  #define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG	(3)
>  
> -/* 10de vendor PCI sub-types */
> -/*
> - * NVIDIA GPU NVlink2 RAM is coherent RAM mapped onto the host address space.
> - */
> -#define VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM	(1)
> -
> -/* 1014 vendor PCI sub-types */
> -/*
> - * IBM NPU NVlink2 ATSD (Address Translation Shootdown) register of NPU
> - * to do TLB invalidation on a GPU.
> - */
> -#define VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD	(1)
> -
>  /* sub-types for VFIO_REGION_TYPE_GFX */
>  #define VFIO_REGION_SUBTYPE_GFX_EDID            (1)
>  
> @@ -637,33 +624,6 @@ struct vfio_device_migration_info {
>   */
>  #define VFIO_REGION_INFO_CAP_MSIX_MAPPABLE	3
>  
> -/*
> - * Capability with compressed real address (aka SSA - small system address)
> - * where GPU RAM is mapped on a system bus. Used by a GPU for DMA routing
> - * and by the userspace to associate a NVLink bridge with a GPU.
> - */
> -#define VFIO_REGION_INFO_CAP_NVLINK2_SSATGT	4
> -
> -struct vfio_region_info_cap_nvlink2_ssatgt {
> -	struct vfio_info_cap_header header;
> -	__u64 tgt;
> -};
> -
> -/*
> - * Capability with an NVLink link speed. The value is read by
> - * the NVlink2 bridge driver from the bridge's "ibm,nvlink-speed"
> - * property in the device tree. The value is fixed in the hardware
> - * and failing to provide the correct value results in the link
> - * not working with no indication from the driver why.
> - */
> -#define VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD	5
> -
> -struct vfio_region_info_cap_nvlink2_lnkspd {
> -	struct vfio_info_cap_header header;
> -	__u32 link_speed;
> -	__u32 __pad;
> -};
> -
>  /**
>   * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9,
>   *				    struct vfio_irq_info)

I'll leave any attempt to defend keeping this code to Alexey, but
minimally these region sub-types and capability IDs should probably be
reserved to avoid breaking whatever userspace might exist to consume
these.  Our ID space is sufficiently large that we don't need to
recycle them any time soon.  Thanks,

Alex

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Re: [PATCH 1/2] vfio/pci: remove vfio_pci_nvlink2

[Jason Gunthorpe]

On Thu, Apr 22, 2021 at 11:49:31PM +1000, Michael Ellerman wrote:
> Alex Williamson <alex.williamson@redhat.com> writes:
> > On Mon, 12 Apr 2021 19:41:41 +1000
> > Michael Ellerman <mpe@ellerman.id.au> wrote:
> >
> >> Alex Williamson <alex.williamson@redhat.com> writes:
> >> > On Fri, 26 Mar 2021 07:13:10 +0100
> >> > Christoph Hellwig <hch@lst.de> wrote:
> >> >  
> >> >> This driver never had any open userspace (which for VFIO would include
> >> >> VM kernel drivers) that use it, and thus should never have been added
> >> >> by our normal userspace ABI rules.
> >> >> 
> >> >> Signed-off-by: Christoph Hellwig <hch@lst.de>
> >> >> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> >> >>  drivers/vfio/pci/Kconfig            |   6 -
> >> >>  drivers/vfio/pci/Makefile           |   1 -
> >> >>  drivers/vfio/pci/vfio_pci.c         |  18 -
> >> >>  drivers/vfio/pci/vfio_pci_nvlink2.c | 490 ----------------------------
> >> >>  drivers/vfio/pci/vfio_pci_private.h |  14 -
> >> >>  include/uapi/linux/vfio.h           |  38 +--
> >> >>  6 files changed, 4 insertions(+), 563 deletions(-)
> >> >>  delete mode 100644 drivers/vfio/pci/vfio_pci_nvlink2.c  
> >> >
> >> > Hearing no objections, applied to vfio next branch for v5.13.  Thanks,  
> >> 
> >> Looks like you only took patch 1?
> >> 
> >> I can't take patch 2 on its own, that would break the build.
> >> 
> >> Do you want to take both patches? There's currently no conflicts against
> >> my tree. It's possible one could appear before the v5.13 merge window,
> >> though it would probably just be something minor.
> >> 
> >> Or I could apply both patches to my tree, which means patch 1 would
> >> appear as two commits in the git history, but that's not a big deal.
> >
> > I've already got a conflict in my next branch with patch 1, so it's
> > best to go through my tree.  Seems like a shared branch would be
> > easiest to allow you to merge and manage potential conflicts against
> > patch 2, I've pushed a branch here:
> >
> > https://github.com/awilliam/linux-vfio.git v5.13/vfio/nvlink
> 
> Thanks.
> 
> My next is based on rc2, so I won't pull that in directly, because I
> don't want to pull all of rc6 in with it.

Linus is fine if you merge in rc's for development reasons. He doesn't
like it when people just merge rc's without a purpose.

Merge rc7 to your tree then pull the nvlink topic is acceptable.

Or just do nothing because Alex will send it through his tree - this
extra co-ordination is really only necessary if there are conflicts.

Jason
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Re: [PATCH 1/2] vfio/pci: remove vfio_pci_nvlink2

[Michael Ellerman]

Alex Williamson <alex.williamson@redhat.com> writes:
> On Mon, 12 Apr 2021 19:41:41 +1000
> Michael Ellerman <mpe@ellerman.id.au> wrote:
>
>> Alex Williamson <alex.williamson@redhat.com> writes:
>> > On Fri, 26 Mar 2021 07:13:10 +0100
>> > Christoph Hellwig <hch@lst.de> wrote:
>> >  
>> >> This driver never had any open userspace (which for VFIO would include
>> >> VM kernel drivers) that use it, and thus should never have been added
>> >> by our normal userspace ABI rules.
>> >> 
>> >> Signed-off-by: Christoph Hellwig <hch@lst.de>
>> >> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> >> ---
>> >>  drivers/vfio/pci/Kconfig            |   6 -
>> >>  drivers/vfio/pci/Makefile           |   1 -
>> >>  drivers/vfio/pci/vfio_pci.c         |  18 -
>> >>  drivers/vfio/pci/vfio_pci_nvlink2.c | 490 ----------------------------
>> >>  drivers/vfio/pci/vfio_pci_private.h |  14 -
>> >>  include/uapi/linux/vfio.h           |  38 +--
>> >>  6 files changed, 4 insertions(+), 563 deletions(-)
>> >>  delete mode 100644 drivers/vfio/pci/vfio_pci_nvlink2.c  
>> >
>> > Hearing no objections, applied to vfio next branch for v5.13.  Thanks,  
>> 
>> Looks like you only took patch 1?
>> 
>> I can't take patch 2 on its own, that would break the build.
>> 
>> Do you want to take both patches? There's currently no conflicts against
>> my tree. It's possible one could appear before the v5.13 merge window,
>> though it would probably just be something minor.
>> 
>> Or I could apply both patches to my tree, which means patch 1 would
>> appear as two commits in the git history, but that's not a big deal.
>
> I've already got a conflict in my next branch with patch 1, so it's
> best to go through my tree.  Seems like a shared branch would be
> easiest to allow you to merge and manage potential conflicts against
> patch 2, I've pushed a branch here:
>
> https://github.com/awilliam/linux-vfio.git v5.13/vfio/nvlink

Thanks.

My next is based on rc2, so I won't pull that in directly, because I
don't want to pull all of rc6 in with it.

I'll put it in a topic branch and merge it into my next after my first
pull has gone to Linus.

cheers
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Re: [PATCH 1/2] vfio/pci: remove vfio_pci_nvlink2

[Alex Williamson]

On Mon, 12 Apr 2021 19:41:41 +1000
Michael Ellerman <mpe@ellerman.id.au> wrote:

> Alex Williamson <alex.williamson@redhat.com> writes:
> > On Fri, 26 Mar 2021 07:13:10 +0100
> > Christoph Hellwig <hch@lst.de> wrote:
> >  
> >> This driver never had any open userspace (which for VFIO would include
> >> VM kernel drivers) that use it, and thus should never have been added
> >> by our normal userspace ABI rules.
> >> 
> >> Signed-off-by: Christoph Hellwig <hch@lst.de>
> >> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> >> ---
> >>  drivers/vfio/pci/Kconfig            |   6 -
> >>  drivers/vfio/pci/Makefile           |   1 -
> >>  drivers/vfio/pci/vfio_pci.c         |  18 -
> >>  drivers/vfio/pci/vfio_pci_nvlink2.c | 490 ----------------------------
> >>  drivers/vfio/pci/vfio_pci_private.h |  14 -
> >>  include/uapi/linux/vfio.h           |  38 +--
> >>  6 files changed, 4 insertions(+), 563 deletions(-)
> >>  delete mode 100644 drivers/vfio/pci/vfio_pci_nvlink2.c  
> >
> > Hearing no objections, applied to vfio next branch for v5.13.  Thanks,  
> 
> Looks like you only took patch 1?
> 
> I can't take patch 2 on its own, that would break the build.
> 
> Do you want to take both patches? There's currently no conflicts against
> my tree. It's possible one could appear before the v5.13 merge window,
> though it would probably just be something minor.
> 
> Or I could apply both patches to my tree, which means patch 1 would
> appear as two commits in the git history, but that's not a big deal.

I've already got a conflict in my next branch with patch 1, so it's
best to go through my tree.  Seems like a shared branch would be
easiest to allow you to merge and manage potential conflicts against
patch 2, I've pushed a branch here:

https://github.com/awilliam/linux-vfio.git v5.13/vfio/nvlink

Thanks,
Alex

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Re: [PATCH 1/2] vfio/pci: remove vfio_pci_nvlink2

[Michael Ellerman]

Alex Williamson <alex.williamson@redhat.com> writes:
> On Fri, 26 Mar 2021 07:13:10 +0100
> Christoph Hellwig <hch@lst.de> wrote:
>
>> This driver never had any open userspace (which for VFIO would include
>> VM kernel drivers) that use it, and thus should never have been added
>> by our normal userspace ABI rules.
>> 
>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> ---
>>  drivers/vfio/pci/Kconfig            |   6 -
>>  drivers/vfio/pci/Makefile           |   1 -
>>  drivers/vfio/pci/vfio_pci.c         |  18 -
>>  drivers/vfio/pci/vfio_pci_nvlink2.c | 490 ----------------------------
>>  drivers/vfio/pci/vfio_pci_private.h |  14 -
>>  include/uapi/linux/vfio.h           |  38 +--
>>  6 files changed, 4 insertions(+), 563 deletions(-)
>>  delete mode 100644 drivers/vfio/pci/vfio_pci_nvlink2.c
>
> Hearing no objections, applied to vfio next branch for v5.13.  Thanks,

Looks like you only took patch 1?

I can't take patch 2 on its own, that would break the build.

Do you want to take both patches? There's currently no conflicts against
my tree. It's possible one could appear before the v5.13 merge window,
though it would probably just be something minor.

Or I could apply both patches to my tree, which means patch 1 would
appear as two commits in the git history, but that's not a big deal.

cheers
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Re: [PATCH 1/2] vfio/pci: remove vfio_pci_nvlink2

[Alex Williamson]

On Fri, 26 Mar 2021 07:13:10 +0100
Christoph Hellwig <hch@lst.de> wrote:

> This driver never had any open userspace (which for VFIO would include
> VM kernel drivers) that use it, and thus should never have been added
> by our normal userspace ABI rules.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/vfio/pci/Kconfig            |   6 -
>  drivers/vfio/pci/Makefile           |   1 -
>  drivers/vfio/pci/vfio_pci.c         |  18 -
>  drivers/vfio/pci/vfio_pci_nvlink2.c | 490 ----------------------------
>  drivers/vfio/pci/vfio_pci_private.h |  14 -
>  include/uapi/linux/vfio.h           |  38 +--
>  6 files changed, 4 insertions(+), 563 deletions(-)
>  delete mode 100644 drivers/vfio/pci/vfio_pci_nvlink2.c

Hearing no objections, applied to vfio next branch for v5.13.  Thanks,

Alex

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