From: Jason Gunthorpe <jgg@nvidia.com>
To: Dave Jiang <dave.jiang@intel.com>
Cc: alex.williamson@redhat.com, kwankhede@nvidia.com,
tglx@linutronix.de, vkoul@kernel.org, megha.dey@intel.com,
jacob.jun.pan@intel.com, ashok.raj@intel.com, yi.l.liu@intel.com,
baolu.lu@intel.com, kevin.tian@intel.com,
sanjay.k.kumar@intel.com, tony.luck@intel.com,
dan.j.williams@intel.com, eric.auger@redhat.com,
pbonzini@redhat.com, dmaengine@vger.kernel.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v6 13/20] vfio/mdev: idxd: add mdev driver registration and helper functions
Date: Sun, 23 May 2021 20:46:06 -0300 [thread overview]
Message-ID: <20210523234606.GJ1002214@nvidia.com> (raw)
In-Reply-To: <162164282601.261970.10405911922092921185.stgit@djiang5-desk3.ch.intel.com>
On Fri, May 21, 2021 at 05:20:26PM -0700, Dave Jiang wrote:
> +static int idxd_vdcm_probe(struct mdev_device *mdev)
> +{
> + struct vdcm_idxd *vidxd;
> + struct vdcm_idxd_type *type;
> + struct device *dev, *parent;
> + struct idxd_device *idxd;
> + bool ims_map[VIDXD_MAX_MSIX_VECS];
> + int rc;
> +
> + parent = mdev_parent_dev(mdev);
> + idxd = dev_get_drvdata(parent);
> + dev = &mdev->dev;
> + mdev_set_iommu_device(mdev, parent);
> + type = idxd_vdcm_get_type(mdev);
This makes my head hurt. There is a kref guarding
mdev_unregister_device() but probe reaches into the parent idxd
device's drvdata? I'm skeptical any of this is locked right
> +static void idxd_vdcm_remove(struct mdev_device *mdev)
> +{
> + struct vdcm_idxd *vidxd = dev_get_drvdata(&mdev->dev);
> + struct idxd_wq *wq = vidxd->wq;
> +
> + vfio_unregister_group_dev(&vidxd->vdev);
> + mdev_irqs_free(mdev);
> + mutex_lock(&wq->wq_lock);
> + idxd_wq_put(wq);
> + mutex_unlock(&wq->wq_lock);
It is also really weird to see something called put that requires the
caller to hold a mutex... Don't use refcount language for something
tha tis not acting like any sort of refcount.
> +static int idxd_vdcm_open(struct vfio_device *vdev)
> +{
> + return 0;
> +}
> +
> +static void idxd_vdcm_close(struct vfio_device *vdev)
> +{
> + struct vdcm_idxd *vidxd = vdev_to_vidxd(vdev);
> +
> + mutex_lock(&vidxd->dev_lock);
> + idxd_vdcm_set_irqs(vidxd, VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
> + VFIO_PCI_MSIX_IRQ_INDEX, 0, 0, NULL);
> +
> + /* Re-initialize the VIDXD to a pristine state for re-use */
> + vidxd_init(vidxd);
> + mutex_unlock(&vidxd->dev_lock);
This is split up weird. open should be doing basic init stuff and
close should just be doing the reset stuff..
Jason
next prev parent reply other threads:[~2021-05-23 23:46 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-22 0:19 [PATCH v6 00/20] Add VFIO mediated device support and DEV-MSI support for the idxd driver Dave Jiang
2021-05-22 0:19 ` [PATCH v6 01/20] vfio/mdev: idxd: add theory of operation documentation for idxd mdev Dave Jiang
2021-05-22 0:19 ` [PATCH v6 02/20] dmaengine: idxd: add external module driver support for dsa_bus_type Dave Jiang
2021-05-22 0:19 ` [PATCH v6 03/20] dmaengine: idxd: add IMS offset and size retrieval code Dave Jiang
2021-05-22 0:19 ` [PATCH v6 04/20] dmaengine: idxd: add portal offset for IMS portals Dave Jiang
2021-05-22 0:19 ` [PATCH v6 05/20] vfio: mdev: common lib code for setting up Interrupt Message Store Dave Jiang
2021-05-24 0:02 ` Jason Gunthorpe
2021-05-28 1:49 ` Dave Jiang
2021-05-28 12:21 ` Jason Gunthorpe
2021-05-28 16:37 ` Dave Jiang
2021-05-28 16:39 ` Jason Gunthorpe
2021-05-31 10:41 ` Thomas Gleixner
2021-05-31 13:48 ` Thomas Gleixner
2021-05-31 15:24 ` Jason Gunthorpe
2021-06-08 15:57 ` Dave Jiang
2021-06-08 17:22 ` Jason Gunthorpe
2021-06-10 13:00 ` Thomas Gleixner
2021-05-22 0:19 ` [PATCH v6 06/20] vfio/mdev: idxd: add PCI config for read/write for mdev Dave Jiang
2021-05-22 0:19 ` [PATCH v6 07/20] vfio/mdev: idxd: Add administrative commands emulation " Dave Jiang
2021-05-22 0:19 ` [PATCH v6 08/20] vfio/mdev: idxd: Add mdev device context initialization Dave Jiang
2021-05-22 0:20 ` [PATCH v6 09/20] vfio/mdev: Add mmio read/write support for mdev Dave Jiang
2021-05-22 0:20 ` [PATCH v6 10/20] vfio/mdev: idxd: add mdev type as a new wq type Dave Jiang
2021-05-22 0:20 ` [PATCH v6 11/20] vfio/mdev: idxd: Add basic driver setup for idxd mdev Dave Jiang
2021-05-23 23:27 ` Jason Gunthorpe
2021-05-23 23:52 ` Jason Gunthorpe
2021-05-22 0:20 ` [PATCH v6 12/20] vfio: move VFIO PCI macros to common header Dave Jiang
2021-06-04 3:47 ` Alex Williamson
2021-05-22 0:20 ` [PATCH v6 13/20] vfio/mdev: idxd: add mdev driver registration and helper functions Dave Jiang
2021-05-23 23:32 ` Jason Gunthorpe
2021-05-23 23:46 ` Jason Gunthorpe [this message]
2021-05-22 0:20 ` [PATCH v6 14/20] vfio/mdev: idxd: add 1dwq-v1 mdev type Dave Jiang
2021-05-23 23:47 ` Jason Gunthorpe
2021-05-22 0:20 ` [PATCH v6 15/20] vfio/mdev: idxd: ims domain setup for the vdcm Dave Jiang
2021-05-23 23:50 ` Jason Gunthorpe
2021-05-27 0:22 ` Dave Jiang
2021-05-27 0:54 ` Jason Gunthorpe
2021-05-27 1:15 ` Dave Jiang
2021-05-27 1:41 ` Raj, Ashok
2021-05-27 13:36 ` Jason Gunthorpe
2021-05-31 14:02 ` Thomas Gleixner
2021-05-31 16:57 ` Jason Gunthorpe
2021-05-31 23:55 ` Thomas Gleixner
2021-06-01 12:16 ` Jason Gunthorpe
2021-05-22 0:20 ` [PATCH v6 16/20] vfio/mdev: idxd: add new wq state for mdev Dave Jiang
2021-05-22 0:20 ` [PATCH v6 17/20] vfio/mdev: idxd: add error notification from host driver to mediated device Dave Jiang
2021-05-22 0:20 ` [PATCH v6 18/20] vfio: move vfio_pci_set_ctx_trigger_single to common code Dave Jiang
2021-05-22 0:21 ` [PATCH v6 19/20] vfio: mdev: Add device request interface Dave Jiang
2021-05-23 22:38 ` Jason Gunthorpe
2021-05-22 0:21 ` [PATCH v6 20/20] vfio: mdev: idxd: setup request interrupt Dave Jiang
2021-05-23 23:22 ` [PATCH v6 00/20] Add VFIO mediated device support and DEV-MSI support for the idxd driver Jason Gunthorpe
2021-06-02 15:40 ` Dave Jiang
2021-06-02 23:17 ` Jason Gunthorpe
2021-06-03 1:11 ` Tian, Kevin
2021-06-03 1:49 ` Jason Gunthorpe
2021-06-03 5:52 ` Tian, Kevin
2021-06-03 11:23 ` Jason Gunthorpe
2021-06-04 3:40 ` Alex Williamson
2021-06-07 6:22 ` Tian, Kevin
2021-06-07 18:13 ` Dave Jiang
2021-06-07 19:11 ` Jason Gunthorpe
2021-06-08 16:02 ` Dave Jiang
2021-06-11 18:21 ` Dave Jiang
2021-06-11 18:29 ` Jason Gunthorpe
2021-06-07 18:28 ` Jason Gunthorpe
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