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From: "Raj, Ashok" <ashok.raj@intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Dave Jiang <dave.jiang@intel.com>,
	vkoul@kernel.org, megha.dey@intel.com, maz@kernel.org,
	bhelgaas@google.com, tglx@linutronix.de,
	alex.williamson@redhat.com, jacob.jun.pan@intel.com,
	yi.l.liu@intel.com, baolu.lu@intel.com, kevin.tian@intel.com,
	sanjay.k.kumar@intel.com, tony.luck@intel.com,
	jing.lin@intel.com, dan.j.williams@intel.com,
	kwankhede@nvidia.com, eric.auger@redhat.com, parav@mellanox.com,
	rafael@kernel.org, netanelg@mellanox.com, shahafs@mellanox.com,
	yan.y.zhao@linux.intel.com, pbonzini@redhat.com,
	samuel.ortiz@intel.com, mona.hossain@intel.com,
	Megha Dey <megha.dey@linux.intel.com>,
	dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org, kvm@vger.kernel.org,
	Ashok Raj <ashok.raj@intel.com>
Subject: Re: [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI support for the idxd driver
Date: Fri, 30 Oct 2020 13:43:07 -0700	[thread overview]
Message-ID: <20201030204307.GA683@otc-nc-03> (raw)
In-Reply-To: <20201030193045.GM2620339@nvidia.com>

On Fri, Oct 30, 2020 at 04:30:45PM -0300, Jason Gunthorpe wrote:
> On Fri, Oct 30, 2020 at 12:23:25PM -0700, Raj, Ashok wrote:
> > On Fri, Oct 30, 2020 at 04:17:06PM -0300, Jason Gunthorpe wrote:
> > > On Fri, Oct 30, 2020 at 12:13:48PM -0700, Dave Jiang wrote:
> > > > 
> > > > 
> > > > On 10/30/2020 11:58 AM, Jason Gunthorpe wrote:
> > > > > On Fri, Oct 30, 2020 at 11:50:47AM -0700, Dave Jiang wrote:
> > > > > >   .../ABI/stable/sysfs-driver-dma-idxd          |    6 +
> > > > > >   Documentation/driver-api/vfio/mdev-idxd.rst   |  404 ++++++
> > > > > >   MAINTAINERS                                   |    1 +
> > > > > >   drivers/dma/Kconfig                           |    9 +
> > > > > >   drivers/dma/idxd/Makefile                     |    2 +
> > > > > >   drivers/dma/idxd/cdev.c                       |    6 +-
> > > > > >   drivers/dma/idxd/device.c                     |  294 ++++-
> > > > > >   drivers/dma/idxd/idxd.h                       |   67 +-
> > > > > >   drivers/dma/idxd/init.c                       |   86 ++
> > > > > >   drivers/dma/idxd/irq.c                        |    6 +-
> > > > > >   drivers/dma/idxd/mdev.c                       | 1121 +++++++++++++++++
> > > > > >   drivers/dma/idxd/mdev.h                       |  116 ++
> > > > > 
> > > > > Again, a subsytem driver belongs in the directory hierarchy of the
> > > > > subsystem, not in other random places. All this mdev stuff belongs
> > > > > under drivers/vfio
> > > > 
> > > > Alex seems to have disagreed last time....
> > > > https://lore.kernel.org/dmaengine/20200917113016.425dcde7@x1.home/
> > > 
> > > Nobody else in the kernel is splitting subsystems up anymore
> > >  
> > > > And I do agree with his perspective. The mdev is an extension of the PF
> > > > driver. It's a bit awkward to be a stand alone mdev driver under vfio/mdev/.
> > > 
> > > By this logic we'd have giagantic drivers under drivers/ethernet
> > > touching netdev, rdma, scsi, vdpa, etc just because that is where the
> > > PF driver came from.
> > 
> > What makes you think this is providing services like scsi/rdma/vdpa etc.. ?
> > 
> > for DSA this playes the exact same role, not a different function 
> > as you highlight above. these mdev's are creating DSA for virtualization
> > use. They aren't providing a completely different role or subsystem per-se.
> 
> It is a different subsystem, different maintainer, and different
> reviewers.
> 
> It is a development process problem, it doesn't matter what it is
> doing.

So drawing that parallel, do you expect all drivers that call
pci_register_driver() to be located in drivers/pci? Aren't they scattered
all over the place ata,scsi, platform drivers and such?

As Alex pointed out, i915 and handful of s390 drivers that are mdev users
are not in drivers/vfio. Are you sayint those drivers don't get reviewed? 

This is no different than PF driver offering VF services. Its a logical
extension. 

Reviews happen for mdev users today. What you suggest seems like cutting 
the feet to fit the shoe. Unless the maintainers are asking things 
to be split just because its calling mdev_register_device() that practice 
doesn't exist and would be totally weird if you want to move all callers of
pci_register_driver(). 

Your argument seems interesting even entertaining :-). But honestly i'm not finding it
practical :-). So every caller of mmu_register_notifier() needs to be in
mm? 

What you mention for different functions make absolute sense, not arguing
against that.  but this ain't that. 

And we just follow the asks of the maintainer. 

I know you aren't going to give up, but there is little we can do. I want
the maintainers to make that call and I'm not add more noise to this.

Cheers,
Ashok

  reply	other threads:[~2020-10-30 20:43 UTC|newest]

Thread overview: 123+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-30 18:50 Dave Jiang
2020-10-30 18:50 ` [PATCH v4 01/17] irqchip: Add IMS (Interrupt Message Store) driver Dave Jiang
2020-10-30 22:01   ` Thomas Gleixner
2020-10-30 18:51 ` [PATCH v4 02/17] iommu/vt-d: Add DEV-MSI support Dave Jiang
2020-10-30 20:31   ` Thomas Gleixner
2020-10-30 20:52     ` Dave Jiang
2020-10-30 18:51 ` [PATCH v4 03/17] dmaengine: idxd: add theory of operation documentation for idxd mdev Dave Jiang
2020-10-30 18:51 ` [PATCH v4 04/17] dmaengine: idxd: add support for readonly config devices Dave Jiang
2020-10-30 18:51 ` [PATCH v4 05/17] dmaengine: idxd: add interrupt handle request support Dave Jiang
2020-10-30 18:51 ` [PATCH v4 06/17] PCI: add SIOV and IMS capability detection Dave Jiang
2020-10-30 19:51   ` Bjorn Helgaas
2020-10-30 21:20     ` Dave Jiang
2020-10-30 21:50       ` Bjorn Helgaas
2020-10-30 22:45       ` Jason Gunthorpe
2020-10-30 22:49         ` Dave Jiang
2020-11-02 13:21           ` Jason Gunthorpe
2020-11-03  2:49             ` Tian, Kevin
2020-11-03 12:43               ` Jason Gunthorpe
2020-11-04  3:41                 ` Tian, Kevin
2020-11-04 12:40                   ` Jason Gunthorpe
2020-11-04 13:34                     ` Tian, Kevin
2020-11-04 13:54                       ` Jason Gunthorpe
2020-11-06  9:48                         ` Tian, Kevin
2020-11-06 13:14                           ` Jason Gunthorpe
2020-11-06 16:48                             ` Raj, Ashok
2020-11-06 17:51                               ` Jason Gunthorpe
2020-11-06 23:47                                 ` Dan Williams
2020-11-07  0:12                                   ` Jason Gunthorpe
2020-11-07  1:42                                     ` Dan Williams
2020-11-08 18:11                                     ` Raj, Ashok
2020-11-08 18:34                                       ` David Woodhouse
2020-11-08 23:25                                         ` Raj, Ashok
2020-11-10 14:19                                           ` Raj, Ashok
2020-11-10 14:41                                             ` David Woodhouse
2020-11-08 23:41                                       ` Jason Gunthorpe
2020-11-09  0:05                                         ` Raj, Ashok
2020-11-08 18:47                                     ` Thomas Gleixner
2020-11-08 19:36                                       ` David Woodhouse
2020-11-08 22:47                                         ` Thomas Gleixner
2020-11-08 23:29                                           ` Jason Gunthorpe
2020-11-11 15:41                                         ` Christoph Hellwig
2020-11-11 16:09                                           ` Raj, Ashok
2020-11-11 22:27                                             ` Thomas Gleixner
2020-11-11 23:03                                               ` Raj, Ashok
2020-11-12  1:13                                                 ` Thomas Gleixner
2020-11-12 13:10                                                 ` Jason Gunthorpe
2020-11-08 23:23                                       ` Jason Gunthorpe
2020-11-08 23:36                                         ` Raj, Ashok
2020-11-09  7:37                                         ` Tian, Kevin
2020-11-09 16:46                                           ` Jason Gunthorpe
2020-11-08 23:58                                       ` Raj, Ashok
2020-11-09  7:59                                         ` Tian, Kevin
2020-11-09 11:21                                         ` Thomas Gleixner
2020-11-09 17:30                                           ` Jason Gunthorpe
2020-11-09 22:40                                             ` Raj, Ashok
2020-11-09 22:42                                             ` Thomas Gleixner
2020-11-10  5:14                                               ` Raj, Ashok
2020-11-10 10:27                                                 ` Thomas Gleixner
2020-11-10 14:13                                                   ` Raj, Ashok
2020-11-10 14:23                                                     ` Jason Gunthorpe
2020-11-11  2:17                                                       ` Tian, Kevin
2020-11-12 13:46                                                         ` Jason Gunthorpe
2020-11-11  7:14                                                     ` Tian, Kevin
2020-11-12 19:32                                                       ` Konrad Rzeszutek Wilk
2020-11-12 22:42                                                         ` Thomas Gleixner
2020-11-13  2:42                                                           ` Tian, Kevin
2020-11-13 12:57                                                             ` Jason Gunthorpe
2020-11-13 13:32                                                             ` Thomas Gleixner
2020-11-13 16:12                                                               ` Luck, Tony
2020-11-13 17:38                                                                 ` Raj, Ashok
2020-11-14 10:34                                                           ` Christoph Hellwig
2020-11-14 21:18                                                             ` Raj, Ashok
2020-11-15 11:26                                                               ` Thomas Gleixner
2020-11-15 19:31                                                                 ` Raj, Ashok
2020-11-15 22:11                                                                   ` Thomas Gleixner
2020-11-16  0:22                                                                     ` Raj, Ashok
2020-11-16  7:31                                                                       ` Tian, Kevin
2020-11-16 15:46                                                                         ` Jason Gunthorpe
2020-11-16 17:56                                                                           ` Thomas Gleixner
2020-11-16 18:02                                                                             ` Jason Gunthorpe
2020-11-16 20:37                                                                               ` Thomas Gleixner
2020-11-16 23:51                                                                               ` Tian, Kevin
2020-11-17  9:21                                                                                 ` Thomas Gleixner
2020-11-16  8:25                                                               ` Christoph Hellwig
2020-11-10 14:19                                                 ` Jason Gunthorpe
2020-11-11  2:35                                                   ` Tian, Kevin
2020-11-08 21:18                             ` Thomas Gleixner
2020-11-08 22:09                               ` David Woodhouse
2020-11-08 22:52                                 ` Thomas Gleixner
2020-11-07  0:32                           ` Thomas Gleixner
2020-11-09  5:25                             ` Tian, Kevin
2020-10-30 18:51 ` [PATCH v4 07/17] dmaengine: idxd: add IMS support in base driver Dave Jiang
2020-10-30 18:51 ` [PATCH v4 08/17] dmaengine: idxd: add device support functions in prep for mdev Dave Jiang
2020-10-30 18:51 ` [PATCH v4 09/17] dmaengine: idxd: add basic mdev registration and helper functions Dave Jiang
2020-10-30 18:51 ` [PATCH v4 10/17] dmaengine: idxd: add emulation rw routines Dave Jiang
2020-10-30 18:52 ` [PATCH v4 11/17] dmaengine: idxd: prep for virtual device commands Dave Jiang
2020-10-30 18:52 ` [PATCH v4 12/17] dmaengine: idxd: virtual device commands emulation Dave Jiang
2020-10-30 18:52 ` [PATCH v4 13/17] dmaengine: idxd: ims setup for the vdcm Dave Jiang
2020-10-30 21:26   ` Thomas Gleixner
2020-10-30 18:52 ` [PATCH v4 14/17] dmaengine: idxd: add mdev type as a new wq type Dave Jiang
2020-10-30 18:52 ` [PATCH v4 15/17] dmaengine: idxd: add dedicated wq mdev type Dave Jiang
2020-10-30 18:52 ` [PATCH v4 16/17] dmaengine: idxd: add new wq state for mdev Dave Jiang
2020-10-30 18:52 ` [PATCH v4 17/17] dmaengine: idxd: add error notification from host driver to mediated device Dave Jiang
2020-10-30 18:58 ` [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI support for the idxd driver Jason Gunthorpe
2020-10-30 19:13   ` Dave Jiang
2020-10-30 19:17     ` Jason Gunthorpe
2020-10-30 19:23       ` Raj, Ashok
2020-10-30 19:30         ` Jason Gunthorpe
2020-10-30 20:43           ` Raj, Ashok [this message]
2020-10-30 22:54             ` Jason Gunthorpe
2020-10-31  2:50             ` Thomas Gleixner
2020-10-31 23:53               ` Raj, Ashok
2020-11-02 13:20                 ` Jason Gunthorpe
2020-11-02 16:20                   ` Raj, Ashok
2020-11-02 17:19                     ` Jason Gunthorpe
2020-11-02 18:18                       ` Dave Jiang
2020-11-02 18:26                         ` Jason Gunthorpe
2020-11-02 18:38                           ` Dan Williams
2020-11-02 18:51                             ` Jason Gunthorpe
2020-11-02 19:26                               ` Dan Williams
2020-10-30 20:48 ` Thomas Gleixner
2020-10-30 20:59   ` Dave Jiang
2020-10-30 22:10     ` Thomas Gleixner

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