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Message-ID: <df037cd2e564acaa14c5a3358fd3386df29ad61e.camel@linux.ibm.com>
Date: Wed, 02 Nov 2022 15:29:00 -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 v2 1/7] vfio/ccw: create a parent struct
On Wed, 2022-11-02 at 16:01 +0100, Eric Farman wrote:
> Move the stuff associated with the mdev parent (and thus the
> subchannel struct) into its own struct, and leave the rest in
> the existing private structure.
>
> The subchannel will point to the parent, and the parent will point
> to the private, for the areas where one or both are needed. Further
> separation of these structs will follow.
>
> Signed-off-by: Eric Farman <farman@...ux.ibm.com>
> ---
> drivers/s390/cio/vfio_ccw_drv.c | 96 ++++++++++++++++++++++++---
> --
> drivers/s390/cio/vfio_ccw_ops.c | 8 ++-
> drivers/s390/cio/vfio_ccw_private.h | 20 ++++--
> 3 files changed, 100 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/s390/cio/vfio_ccw_drv.c
> b/drivers/s390/cio/vfio_ccw_drv.c
> index 7f5402fe857a..06022fb37b9d 100644
> --- a/drivers/s390/cio/vfio_ccw_drv.c
> +++ b/drivers/s390/cio/vfio_ccw_drv.c
> @@ -36,10 +36,19 @@ debug_info_t *vfio_ccw_debug_trace_id;
> */
> int vfio_ccw_sch_quiesce(struct subchannel *sch)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(&sch-
> >dev);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
> DECLARE_COMPLETION_ONSTACK(completion);
> int iretry, ret = 0;
>
> + /*
> + * Probably an impossible situation, after being called
> through
> + * FSM callbacks. But in the event it did, register a warning
> + * and return as if things were fine.
> + */
> + if (WARN_ON(!private))
> + return 0;
> +
> iretry = 255;
> do {
>
> @@ -121,7 +130,22 @@ static void vfio_ccw_crw_todo(struct work_struct
> *work)
> */
> static void vfio_ccw_sch_irq(struct subchannel *sch)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(&sch-
> >dev);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
> +
> + /*
> + * The subchannel should still be disabled at this point,
> + * so an interrupt would be quite surprising. As with an
> + * interrupt while the FSM is closed, let's attempt to
> + * disable the subchannel again.
> + */
> + if (!private) {
> + VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: unexpected
> interrupt\n",
> + sch->schid.cssid, sch->schid.ssid, sch-
> >schid.sch_no);
> +
> + cio_disable_subchannel(sch);
> + return;
> + }
>
> inc_irq_stat(IRQIO_CIO);
> vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_INTERRUPT);
> @@ -201,10 +225,19 @@ static void vfio_ccw_free_private(struct
> vfio_ccw_private *private)
> mutex_destroy(&private->io_mutex);
> kfree(private);
> }
> +
> +static void vfio_ccw_free_parent(struct device *dev)
> +{
> + struct vfio_ccw_parent *parent = container_of(dev, struct
> vfio_ccw_parent, dev);
> +
> + kfree(parent);
> +}
> +
> static int vfio_ccw_sch_probe(struct subchannel *sch)
> {
> struct pmcw *pmcw = &sch->schib.pmcw;
> struct vfio_ccw_private *private;
> + struct vfio_ccw_parent *parent;
> int ret = -ENOMEM;
>
> if (pmcw->qf) {
> @@ -213,41 +246,62 @@ static int vfio_ccw_sch_probe(struct subchannel
> *sch)
> return -ENODEV;
> }
>
> + parent = kzalloc(sizeof(*parent), GFP_KERNEL);
> + if (IS_ERR(parent))
> + return PTR_ERR(parent);
> +
> + dev_set_name(&parent->dev, "parent");
> + parent->dev.parent = &sch->dev;
> + parent->dev.release = &vfio_ccw_free_parent;
> + ret = device_register(&parent->dev);
> + if (ret)
> + goto out_free;
> +
> private = vfio_ccw_alloc_private(sch);
> - if (IS_ERR(private))
> + if (IS_ERR(private)) {
> + put_device(&parent->dev);
This should've been device_unregister. (I could rearrange the code a
bit to avoid the mix of returns/gotos around here, but since the whole
series is trying to separate these two structs that seems unnecessary.)
> return PTR_ERR(private);
> + }
>
> - dev_set_drvdata(&sch->dev, private);
> + dev_set_drvdata(&sch->dev, parent);
> + dev_set_drvdata(&parent->dev, private);
>
> - private->mdev_type.sysfs_name = "io";
> - private->mdev_type.pretty_name = "I/O subchannel (Non-QDIO)";
> - private->mdev_types[0] = &private->mdev_type;
> - ret = mdev_register_parent(&private->parent, &sch->dev,
> + parent->mdev_type.sysfs_name = "io";
> + parent->mdev_type.pretty_name = "I/O subchannel (Non-QDIO)";
> + parent->mdev_types[0] = &parent->mdev_type;
> + ret = mdev_register_parent(&parent->parent, &sch->dev,
> &vfio_ccw_mdev_driver,
> - private->mdev_types, 1);
> + parent->mdev_types, 1);
> if (ret)
> - goto out_free;
> + goto out_unreg;
>
> VFIO_CCW_MSG_EVENT(4, "bound to subchannel %x.%x.%04x\n",
> sch->schid.cssid, sch->schid.ssid,
> sch->schid.sch_no);
> return 0;
>
> +out_unreg:
> + device_unregister(&parent->dev);
> out_free:
> + dev_set_drvdata(&parent->dev, NULL);
> dev_set_drvdata(&sch->dev, NULL);
> vfio_ccw_free_private(private);
> + put_device(&parent->dev);
While this...
> return ret;
> }
>
> static void vfio_ccw_sch_remove(struct subchannel *sch)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(&sch-
> >dev);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
>
> - mdev_unregister_parent(&private->parent);
> + mdev_unregister_parent(&parent->parent);
>
> + device_unregister(&parent->dev);
> dev_set_drvdata(&sch->dev, NULL);
>
> vfio_ccw_free_private(private);
> + put_device(&parent->dev);
...and this shouldn't even be there. Sorry for the brain fog.
>
> VFIO_CCW_MSG_EVENT(4, "unbound from subchannel %x.%x.%04x\n",
> sch->schid.cssid, sch->schid.ssid,
> @@ -256,7 +310,11 @@ static void vfio_ccw_sch_remove(struct
> subchannel *sch)
>
> static void vfio_ccw_sch_shutdown(struct subchannel *sch)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(&sch-
> >dev);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
> +
> + if (WARN_ON(!private))
> + return;
>
> vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE);
> vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
> @@ -274,7 +332,8 @@ static void vfio_ccw_sch_shutdown(struct
> subchannel *sch)
> */
> static int vfio_ccw_sch_event(struct subchannel *sch, int process)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(&sch-
> >dev);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
> unsigned long flags;
> int rc = -EAGAIN;
>
> @@ -287,8 +346,10 @@ static int vfio_ccw_sch_event(struct subchannel
> *sch, int process)
>
> rc = 0;
>
> - if (cio_update_schib(sch))
> - vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
> + if (cio_update_schib(sch)) {
> + if (private)
> + vfio_ccw_fsm_event(private,
> VFIO_CCW_EVENT_NOT_OPER);
> + }
>
> out_unlock:
> spin_unlock_irqrestore(sch->lock, flags);
> @@ -326,7 +387,8 @@ static void vfio_ccw_queue_crw(struct
> vfio_ccw_private *private,
> static int vfio_ccw_chp_event(struct subchannel *sch,
> struct chp_link *link, int event)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(&sch-
> >dev);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
> int mask = chp_ssd_get_mask(&sch->ssd_info, link);
> int retry = 255;
>
> diff --git a/drivers/s390/cio/vfio_ccw_ops.c
> b/drivers/s390/cio/vfio_ccw_ops.c
> index 6ae4d012d800..dc084883d872 100644
> --- a/drivers/s390/cio/vfio_ccw_ops.c
> +++ b/drivers/s390/cio/vfio_ccw_ops.c
> @@ -55,7 +55,9 @@ static int vfio_ccw_mdev_init_dev(struct
> vfio_device *vdev)
>
> static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(mdev-
> >dev.parent);
> + struct subchannel *sch = to_subchannel(mdev->dev.parent);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
> int ret;
>
> if (private->state == VFIO_CCW_STATE_NOT_OPER)
> @@ -100,7 +102,9 @@ static void vfio_ccw_mdev_release_dev(struct
> vfio_device *vdev)
>
> static void vfio_ccw_mdev_remove(struct mdev_device *mdev)
> {
> - struct vfio_ccw_private *private = dev_get_drvdata(mdev-
> >dev.parent);
> + struct subchannel *sch = to_subchannel(mdev->dev.parent);
> + struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> + struct vfio_ccw_private *private = dev_get_drvdata(&parent-
> >dev);
>
> VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: remove\n",
> private->sch->schid.cssid,
> diff --git a/drivers/s390/cio/vfio_ccw_private.h
> b/drivers/s390/cio/vfio_ccw_private.h
> index bd5fb81456af..1f598d58d969 100644
> --- a/drivers/s390/cio/vfio_ccw_private.h
> +++ b/drivers/s390/cio/vfio_ccw_private.h
> @@ -67,6 +67,21 @@ struct vfio_ccw_crw {
> struct crw crw;
> };
>
> +/**
> + * struct vfio_ccw_parent
> + *
> + * @dev: embedded device struct
> + * @parent: parent data structures for mdevs created
> + * @mdev_type(s): identifying information for mdevs created
> + */
> +struct vfio_ccw_parent {
> + struct device dev;
> +
> + struct mdev_parent parent;
> + struct mdev_type mdev_type;
> + struct mdev_type *mdev_types[1];
> +};
> +
> /**
> * struct vfio_ccw_private
> * @vdev: Embedded VFIO device
> @@ -89,7 +104,6 @@ struct vfio_ccw_crw {
> * @io_work: work for deferral process of I/O handling
> * @crw_work: work for deferral process of CRW handling
> * @release_comp: synchronization helper for vfio device release
> - * @parent: parent data structures for mdevs created
> */
> struct vfio_ccw_private {
> struct vfio_device vdev;
> @@ -116,10 +130,6 @@ struct vfio_ccw_private {
> struct work_struct crw_work;
>
> struct completion release_comp;
> -
> - struct mdev_parent parent;
> - struct mdev_type mdev_type;
> - struct mdev_type *mdev_types[1];
> } __aligned(8);
>
> int vfio_ccw_sch_quiesce(struct subchannel *sch);
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