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Date: Fri, 28 Oct 2022 15:18:28 -0400
From: Eric Farman <farman@...ux.ibm.com>
To: Matthew Rosato <mjrosato@...ux.ibm.com>,
Alex Williamson <alex.williamson@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Jason Gunthorpe <jgg@...dia.com>,
Kevin Tian <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>,
Zhi Wang <zhi.a.wang@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Halil Pasic <pasic@...ux.ibm.com>,
Vineeth Vijayan <vneethv@...ux.ibm.com>,
Peter Oberparleiter <oberpar@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Tony Krowiak <akrowiak@...ux.ibm.com>,
Jason Herne <jjherne@...ux.ibm.com>,
Harald Freudenberger <freude@...ux.ibm.com>,
Diana Craciun <diana.craciun@....nxp.com>,
Eric Auger <eric.auger@...hat.com>,
Kirti Wankhede <kwankhede@...dia.com>,
Abhishek Sahu <abhsahu@...dia.com>,
Yishai Hadas <yishaih@...dia.com>,
intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
kvm@...r.kernel.org
Subject: Re: [PATCH v1 3/7] vfio/ccw: move private initialization to callback
On Fri, 2022-10-28 at 14:52 -0400, Matthew Rosato wrote:
> On 10/19/22 12:21 PM, Eric Farman wrote:
> > There's already a device initialization callback that is
> > used to initialize the release completion workaround.
>
> As discussed off-list, maybe clarify what callback you're talking
> about here and/or reference the commit that added it.
Agreed. Will point out that it's private->release_comp, introduced with
commit ebb72b765fb49 ("vfio/ccw: Use the new device life cycle
helpers")
>
> >
> > Move the other elements of the vfio_ccw_private struct that
> > require distinct initialization over to that routine.
> >
> > Signed-off-by: Eric Farman <farman@...ux.ibm.com>
> > ---
> > drivers/s390/cio/vfio_ccw_drv.c | 57 +++----------------------
> > ----
> > drivers/s390/cio/vfio_ccw_ops.c | 43 ++++++++++++++++++++++
> > drivers/s390/cio/vfio_ccw_private.h | 7 +++-
> > 3 files changed, 55 insertions(+), 52 deletions(-)
> >
> > diff --git a/drivers/s390/cio/vfio_ccw_drv.c
> > b/drivers/s390/cio/vfio_ccw_drv.c
> > index 4ee953c8ae39..cc9ed2fd970f 100644
> > --- a/drivers/s390/cio/vfio_ccw_drv.c
> > +++ b/drivers/s390/cio/vfio_ccw_drv.c
> > @@ -24,10 +24,10 @@
> > #include "vfio_ccw_private.h"
> >
> > struct workqueue_struct *vfio_ccw_work_q;
> > -static struct kmem_cache *vfio_ccw_io_region;
> > -static struct kmem_cache *vfio_ccw_cmd_region;
> > -static struct kmem_cache *vfio_ccw_schib_region;
> > -static struct kmem_cache *vfio_ccw_crw_region;
> > +struct kmem_cache *vfio_ccw_io_region;
> > +struct kmem_cache *vfio_ccw_cmd_region;
> > +struct kmem_cache *vfio_ccw_schib_region;
> > +struct kmem_cache *vfio_ccw_crw_region;
> >
> > debug_info_t *vfio_ccw_debug_msg_id;
> > debug_info_t *vfio_ccw_debug_trace_id;
> > @@ -74,7 +74,7 @@ int vfio_ccw_sch_quiesce(struct subchannel *sch)
> > return ret;
> > }
> >
> > -static void vfio_ccw_sch_io_todo(struct work_struct *work)
> > +void vfio_ccw_sch_io_todo(struct work_struct *work)
> > {
> > struct vfio_ccw_private *private;
> > struct irb *irb;
> > @@ -110,7 +110,7 @@ static void vfio_ccw_sch_io_todo(struct
> > work_struct *work)
> > eventfd_signal(private->io_trigger, 1);
> > }
> >
> > -static void vfio_ccw_crw_todo(struct work_struct *work)
> > +void vfio_ccw_crw_todo(struct work_struct *work)
> > {
> > struct vfio_ccw_private *private;
> >
> > @@ -154,52 +154,7 @@ static struct vfio_ccw_private
> > *vfio_ccw_alloc_private(struct subchannel *sch)
> > if (!private)
> > return ERR_PTR(-ENOMEM);
>
> Not sure we really still need vfio_ccw_alloc_private() now or whether
> you can just kzalloc() inline right in vfio_ccw_sch_probe()
Fair. It ends up ends up getting scrapped in patch 6 anyway, but that
might clean things up just a smidge more. Will give it a whirl.
> Either way:
>
> Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>
Thanks!
>
>
> >
> > - mutex_init(&private->io_mutex);
> > - private->state = VFIO_CCW_STATE_STANDBY;
> > - INIT_LIST_HEAD(&private->crw);
> > - INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
> > - INIT_WORK(&private->crw_work, vfio_ccw_crw_todo);
> > -
> > - private->cp.guest_cp = kcalloc(CCWCHAIN_LEN_MAX,
> > sizeof(struct ccw1),
> > - GFP_KERNEL);
> > - if (!private->cp.guest_cp)
> > - goto out_free_private;
> > -
> > - private->io_region = kmem_cache_zalloc(vfio_ccw_io_region,
> > - GFP_KERNEL |
> > GFP_DMA);
> > - if (!private->io_region)
> > - goto out_free_cp;
> > -
> > - private->cmd_region =
> > kmem_cache_zalloc(vfio_ccw_cmd_region,
> > - GFP_KERNEL |
> > GFP_DMA);
> > - if (!private->cmd_region)
> > - goto out_free_io;
> > -
> > - private->schib_region =
> > kmem_cache_zalloc(vfio_ccw_schib_region,
> > - GFP_KERNEL |
> > GFP_DMA);
> > -
> > - if (!private->schib_region)
> > - goto out_free_cmd;
> > -
> > - private->crw_region =
> > kmem_cache_zalloc(vfio_ccw_crw_region,
> > - GFP_KERNEL |
> > GFP_DMA);
> > -
> > - if (!private->crw_region)
> > - goto out_free_schib;
> > return private;
> > -
> > -out_free_schib:
> > - kmem_cache_free(vfio_ccw_schib_region, private-
> > >schib_region);
> > -out_free_cmd:
> > - kmem_cache_free(vfio_ccw_cmd_region, private->cmd_region);
> > -out_free_io:
> > - kmem_cache_free(vfio_ccw_io_region, private->io_region);
> > -out_free_cp:
> > - kfree(private->cp.guest_cp);
> > -out_free_private:
> > - mutex_destroy(&private->io_mutex);
> > - kfree(private);
> > - return ERR_PTR(-ENOMEM);
> > }
> >
> > static void vfio_ccw_free_private(struct vfio_ccw_private
> > *private)
> > diff --git a/drivers/s390/cio/vfio_ccw_ops.c
> > b/drivers/s390/cio/vfio_ccw_ops.c
> > index cf383c729d53..626b8eb3507b 100644
> > --- a/drivers/s390/cio/vfio_ccw_ops.c
> > +++ b/drivers/s390/cio/vfio_ccw_ops.c
> > @@ -50,8 +50,51 @@ static int vfio_ccw_mdev_init_dev(struct
> > vfio_device *vdev)
> > struct vfio_ccw_private *private =
> > container_of(vdev, struct vfio_ccw_private, vdev);
> >
> > + mutex_init(&private->io_mutex);
> > + private->state = VFIO_CCW_STATE_STANDBY;
> > + INIT_LIST_HEAD(&private->crw);
> > + INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
> > + INIT_WORK(&private->crw_work, vfio_ccw_crw_todo);
> > init_completion(&private->release_comp);
> > +
> > + private->cp.guest_cp = kcalloc(CCWCHAIN_LEN_MAX,
> > sizeof(struct ccw1),
> > + GFP_KERNEL);
> > + if (!private->cp.guest_cp)
> > + goto out_free_private;
> > +
> > + private->io_region = kmem_cache_zalloc(vfio_ccw_io_region,
> > + GFP_KERNEL |
> > GFP_DMA);
> > + if (!private->io_region)
> > + goto out_free_cp;
> > +
> > + private->cmd_region =
> > kmem_cache_zalloc(vfio_ccw_cmd_region,
> > + GFP_KERNEL |
> > GFP_DMA);
> > + if (!private->cmd_region)
> > + goto out_free_io;
> > +
> > + private->schib_region =
> > kmem_cache_zalloc(vfio_ccw_schib_region,
> > + GFP_KERNEL |
> > GFP_DMA);
> > + if (!private->schib_region)
> > + goto out_free_cmd;
> > +
> > + private->crw_region =
> > kmem_cache_zalloc(vfio_ccw_crw_region,
> > + GFP_KERNEL |
> > GFP_DMA);
> > + if (!private->crw_region)
> > + goto out_free_schib;
> > +
> > return 0;
> > +
> > +out_free_schib:
> > + kmem_cache_free(vfio_ccw_schib_region, private-
> > >schib_region);
> > +out_free_cmd:
> > + kmem_cache_free(vfio_ccw_cmd_region, private->cmd_region);
> > +out_free_io:
> > + kmem_cache_free(vfio_ccw_io_region, private->io_region);
> > +out_free_cp:
> > + kfree(private->cp.guest_cp);
> > +out_free_private:
> > + mutex_destroy(&private->io_mutex);
> > + return -ENOMEM;
> > }
> >
> > static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
> > diff --git a/drivers/s390/cio/vfio_ccw_private.h
> > b/drivers/s390/cio/vfio_ccw_private.h
> > index 0fdff1435230..b35940057073 100644
> > --- a/drivers/s390/cio/vfio_ccw_private.h
> > +++ b/drivers/s390/cio/vfio_ccw_private.h
> > @@ -116,6 +116,8 @@ struct vfio_ccw_private {
> > } __aligned(8);
> >
> > int vfio_ccw_sch_quiesce(struct subchannel *sch);
> > +void vfio_ccw_sch_io_todo(struct work_struct *work);
> > +void vfio_ccw_crw_todo(struct work_struct *work);
> >
> > extern struct mdev_driver vfio_ccw_mdev_driver;
> >
> > @@ -163,7 +165,10 @@ static inline void vfio_ccw_fsm_event(struct
> > vfio_ccw_private *private,
> > }
> >
> > extern struct workqueue_struct *vfio_ccw_work_q;
> > -
> > +extern struct kmem_cache *vfio_ccw_io_region;
> > +extern struct kmem_cache *vfio_ccw_cmd_region;
> > +extern struct kmem_cache *vfio_ccw_schib_region;
> > +extern struct kmem_cache *vfio_ccw_crw_region;
> >
> > /* s390 debug feature, similar to base cio */
> > extern debug_info_t *vfio_ccw_debug_msg_id;
>
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