| Message ID | 20191104123952.17276-4-jasowang@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mdev based hardware virtio offloading support | expand |
On Mon, 4 Nov 2019 20:39:49 +0800 Jason Wang <jasowang@redhat.com> wrote: > Currently, except for the create and remove, the rest of > mdev_parent_ops is designed for vfio-mdev driver only and may not help > for kernel mdev driver. With the help of class id, this patch > introduces device specific callbacks inside mdev_device > structure. This allows different set of callback to be used by > vfio-mdev and virtio-mdev. > > Reviewed-by: Parav Pandit <parav@mellanox.com> > Signed-off-by: Jason Wang <jasowang@redhat.com> > --- > .../driver-api/vfio-mediated-device.rst | 35 +++++++++---- > MAINTAINERS | 1 + > drivers/gpu/drm/i915/gvt/kvmgt.c | 18 ++++--- > drivers/s390/cio/vfio_ccw_ops.c | 18 ++++--- > drivers/s390/crypto/vfio_ap_ops.c | 14 +++-- > drivers/vfio/mdev/mdev_core.c | 25 ++++++++- > drivers/vfio/mdev/mdev_private.h | 5 ++ > drivers/vfio/mdev/vfio_mdev.c | 37 ++++++------- > include/linux/mdev.h | 43 ++++----------- > include/linux/mdev_vfio_ops.h | 52 +++++++++++++++++++ > samples/vfio-mdev/mbochs.c | 20 ++++--- > samples/vfio-mdev/mdpy.c | 20 ++++--- > samples/vfio-mdev/mtty.c | 18 ++++--- > 13 files changed, 206 insertions(+), 100 deletions(-) > create mode 100644 include/linux/mdev_vfio_ops.h > > diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst > index 6709413bee29..e35f1f8f946e 100644 > --- a/Documentation/driver-api/vfio-mediated-device.rst > +++ b/Documentation/driver-api/vfio-mediated-device.rst > @@ -152,15 +152,6 @@ callbacks per mdev parent device, per mdev type, or any other categorization. > Vendor drivers are expected to be fully asynchronous in this respect or > provide their own internal resource protection.) > > -The callbacks in the mdev_parent_ops structure are as follows: > - > -* open: open callback of mediated device > -* close: close callback of mediated device > -* ioctl: ioctl callback of mediated device > -* read : read emulation callback > -* write: write emulation callback > -* mmap: mmap emulation callback > - > A driver should use the mdev_parent_ops structure in the function call to > register itself with the mdev core driver:: > > @@ -172,10 +163,34 @@ that a driver should use to unregister itself with the mdev core driver:: > > extern void mdev_unregister_device(struct device *dev); > > -It is also required to specify the class_id in create() callback through:: > +As multiple types of mediated devices may be supported, class id needs > +to be specified in the create callback(). This could be done > +explicitly for the device that does not use on mdev bus for its > +operation through: > > int mdev_set_class(struct mdev_device *mdev, u16 id); > > +For the device that uses on the mdev bus for its operation, the class > +should provide helper function to set class id and device specific > +ops. E.g for vfio-mdev devices, the function to be called is:: > + > + int mdev_set_vfio_ops(struct mdev_device *mdev, > + const struct mdev_vfio_device_ops *vfio_ops); > + > +The class id (set by this function to MDEV_CLASS_ID_VFIO) is used to > +match a device with an mdev driver via its id table. The device > +specific callbacks (specified in *vfio_ops) are obtainable via > +mdev_get_vfio_ops() (for use by the mdev bus driver). A vfio-mdev > +device (class id MDEV_CLASS_ID_VFIO) uses the following > +device-specific ops: > + > +* open: open callback of vfio mediated device > +* close: close callback of vfio mediated device > +* ioctl: ioctl callback of vfio mediated device > +* read : read emulation callback > +* write: write emulation callback > +* mmap: mmap emulation callback > + > Mediated Device Management Interface Through sysfs > ================================================== > > diff --git a/MAINTAINERS b/MAINTAINERS > index cba1095547fd..f661d13344d6 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -17121,6 +17121,7 @@ S: Maintained > F: Documentation/driver-api/vfio-mediated-device.rst > F: drivers/vfio/mdev/ > F: include/linux/mdev.h > +F: include/linux/mdev_vfio_ops.h > F: samples/vfio-mdev/ > > VFIO PLATFORM DRIVER > diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c > index 6420f0dbd31b..662f3a672372 100644 > --- a/drivers/gpu/drm/i915/gvt/kvmgt.c > +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c > @@ -42,6 +42,7 @@ > #include <linux/kvm_host.h> > #include <linux/vfio.h> > #include <linux/mdev.h> > +#include <linux/mdev_vfio_ops.h> > #include <linux/debugfs.h> > > #include <linux/nospec.h> > @@ -643,6 +644,8 @@ static void kvmgt_put_vfio_device(void *vgpu) > vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device); > } > > +static const struct mdev_vfio_device_ops intel_vfio_vgpu_dev_ops; > + > static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) > { > struct intel_vgpu *vgpu = NULL; > @@ -678,7 +681,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) > dev_name(mdev_dev(mdev))); > ret = 0; > > - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev_set_vfio_ops(mdev, &intel_vfio_vgpu_dev_ops); > out: > return ret; > } > @@ -1599,20 +1602,21 @@ static const struct attribute_group *intel_vgpu_groups[] = { > NULL, > }; > > -static struct mdev_parent_ops intel_vgpu_ops = { > - .mdev_attr_groups = intel_vgpu_groups, > - .create = intel_vgpu_create, > - .remove = intel_vgpu_remove, > - > +static const struct mdev_vfio_device_ops intel_vfio_vgpu_dev_ops = { > .open = intel_vgpu_open, > .release = intel_vgpu_release, > - > .read = intel_vgpu_read, > .write = intel_vgpu_write, > .mmap = intel_vgpu_mmap, > .ioctl = intel_vgpu_ioctl, > }; > > +static struct mdev_parent_ops intel_vgpu_ops = { > + .mdev_attr_groups = intel_vgpu_groups, > + .create = intel_vgpu_create, > + .remove = intel_vgpu_remove, > +}; > + > static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops) > { > struct attribute **kvm_type_attrs; > diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c > index cf2c013ae32f..fa473ded71c7 100644 > --- a/drivers/s390/cio/vfio_ccw_ops.c > +++ b/drivers/s390/cio/vfio_ccw_ops.c > @@ -12,6 +12,7 @@ > > #include <linux/vfio.h> > #include <linux/mdev.h> > +#include <linux/mdev_vfio_ops.h> > #include <linux/nospec.h> > #include <linux/slab.h> > > @@ -110,6 +111,8 @@ static struct attribute_group *mdev_type_groups[] = { > NULL, > }; > > +static const struct mdev_vfio_device_ops mdev_vfio_ops; > + > static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) > { > struct vfio_ccw_private *private = > @@ -129,7 +132,7 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) > private->sch->schid.ssid, > private->sch->schid.sch_no); > > - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); > return 0; > } > > @@ -575,11 +578,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, > } > } > > -static const struct mdev_parent_ops vfio_ccw_mdev_ops = { > - .owner = THIS_MODULE, > - .supported_type_groups = mdev_type_groups, > - .create = vfio_ccw_mdev_create, > - .remove = vfio_ccw_mdev_remove, > +static const struct mdev_vfio_device_ops mdev_vfio_ops = { > .open = vfio_ccw_mdev_open, > .release = vfio_ccw_mdev_release, > .read = vfio_ccw_mdev_read, > @@ -587,6 +586,13 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = { > .ioctl = vfio_ccw_mdev_ioctl, > }; > > +static const struct mdev_parent_ops vfio_ccw_mdev_ops = { > + .owner = THIS_MODULE, > + .supported_type_groups = mdev_type_groups, > + .create = vfio_ccw_mdev_create, > + .remove = vfio_ccw_mdev_remove, > +}; > + > int vfio_ccw_mdev_reg(struct subchannel *sch) > { > return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops); > diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c > index 07c31070afeb..7bdc62393112 100644 > --- a/drivers/s390/crypto/vfio_ap_ops.c > +++ b/drivers/s390/crypto/vfio_ap_ops.c > @@ -16,6 +16,7 @@ > #include <linux/bitops.h> > #include <linux/kvm_host.h> > #include <linux/module.h> > +#include <linux/mdev_vfio_ops.h> > #include <asm/kvm.h> > #include <asm/zcrypt.h> > > @@ -321,6 +322,8 @@ static void vfio_ap_matrix_init(struct ap_config_info *info, > matrix->adm_max = info->apxa ? info->Nd : 15; > } > > +static const struct mdev_vfio_device_ops mdev_vfio_ops; > + > static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) > { > struct ap_matrix_mdev *matrix_mdev; > @@ -343,7 +346,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) > list_add(&matrix_mdev->node, &matrix_dev->mdev_list); > mutex_unlock(&matrix_dev->lock); > > - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); > return 0; > } > > @@ -1281,15 +1284,18 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev, > return ret; > } > > +static const struct mdev_vfio_device_ops mdev_vfio_ops = { > + .open = vfio_ap_mdev_open, > + .release = vfio_ap_mdev_release, > + .ioctl = vfio_ap_mdev_ioctl, > +}; > + > static const struct mdev_parent_ops vfio_ap_matrix_ops = { > .owner = THIS_MODULE, > .supported_type_groups = vfio_ap_mdev_type_groups, > .mdev_attr_groups = vfio_ap_mdev_attr_groups, > .create = vfio_ap_mdev_create, > .remove = vfio_ap_mdev_remove, > - .open = vfio_ap_mdev_open, > - .release = vfio_ap_mdev_release, > - .ioctl = vfio_ap_mdev_ioctl, > }; > > int vfio_ap_mdev_register(void) > diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c > index d23ca39e3be6..8d579d7ed82f 100644 > --- a/drivers/vfio/mdev/mdev_core.c > +++ b/drivers/vfio/mdev/mdev_core.c > @@ -45,9 +45,10 @@ void mdev_set_drvdata(struct mdev_device *mdev, void *data) > } > EXPORT_SYMBOL(mdev_set_drvdata); > > + Extra whitespace > /* Specify the class for the mdev device, this must be called during > - * create() callback. > - */ > + * create() callback explicitly or implicity through the helpers s/implicity/implicitly/ > + * provided by each class. */ > void mdev_set_class(struct mdev_device *mdev, u16 id) > { > WARN_ON(mdev->class_id); > @@ -55,6 +56,26 @@ void mdev_set_class(struct mdev_device *mdev, u16 id) > } > EXPORT_SYMBOL(mdev_set_class); > > +/* Specify the mdev device to be a VFIO mdev device, and set VFIO > + * device ops for it. This must be called from the create() callback > + * for VFIO mdev device. > + */ Comment style. Thanks, Alex > +void mdev_set_vfio_ops(struct mdev_device *mdev, > + const struct mdev_vfio_device_ops *vfio_ops) > +{ > + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev->vfio_ops = vfio_ops; > +} > +EXPORT_SYMBOL(mdev_set_vfio_ops); > + > +/* Get the VFIO device ops for the mdev device. */ > +const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev) > +{ > + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VFIO); > + return mdev->vfio_ops; > +} > +EXPORT_SYMBOL(mdev_get_vfio_ops); > + > struct device *mdev_dev(struct mdev_device *mdev) > { > return &mdev->dev; > diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h > index c65f436c1869..411227373625 100644 > --- a/drivers/vfio/mdev/mdev_private.h > +++ b/drivers/vfio/mdev/mdev_private.h > @@ -10,6 +10,8 @@ > #ifndef MDEV_PRIVATE_H > #define MDEV_PRIVATE_H > > +#include <linux/mdev_vfio_ops.h> > + > int mdev_bus_register(void); > void mdev_bus_unregister(void); > > @@ -34,6 +36,9 @@ struct mdev_device { > struct device *iommu_device; > bool active; > u16 class_id; > + union { > + const struct mdev_vfio_device_ops *vfio_ops; > + }; > }; > > #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) > diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c > index a6641cd8b5a3..c01e2194e4b3 100644 > --- a/drivers/vfio/mdev/vfio_mdev.c > +++ b/drivers/vfio/mdev/vfio_mdev.c > @@ -14,6 +14,7 @@ > #include <linux/slab.h> > #include <linux/vfio.h> > #include <linux/mdev.h> > +#include <linux/mdev_vfio_ops.h> > > #include "mdev_private.h" > > @@ -24,16 +25,16 @@ > static int vfio_mdev_open(void *device_data) > { > struct mdev_device *mdev = device_data; > - struct mdev_parent *parent = mdev->parent; > + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); > int ret; > > - if (unlikely(!parent->ops->open)) > + if (unlikely(!ops->open)) > return -EINVAL; > > if (!try_module_get(THIS_MODULE)) > return -ENODEV; > > - ret = parent->ops->open(mdev); > + ret = ops->open(mdev); > if (ret) > module_put(THIS_MODULE); > > @@ -43,10 +44,10 @@ static int vfio_mdev_open(void *device_data) > static void vfio_mdev_release(void *device_data) > { > struct mdev_device *mdev = device_data; > - struct mdev_parent *parent = mdev->parent; > + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); > > - if (likely(parent->ops->release)) > - parent->ops->release(mdev); > + if (likely(ops->release)) > + ops->release(mdev); > > module_put(THIS_MODULE); > } > @@ -55,47 +56,47 @@ static long vfio_mdev_unlocked_ioctl(void *device_data, > unsigned int cmd, unsigned long arg) > { > struct mdev_device *mdev = device_data; > - struct mdev_parent *parent = mdev->parent; > + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); > > - if (unlikely(!parent->ops->ioctl)) > + if (unlikely(!ops->ioctl)) > return -EINVAL; > > - return parent->ops->ioctl(mdev, cmd, arg); > + return ops->ioctl(mdev, cmd, arg); > } > > static ssize_t vfio_mdev_read(void *device_data, char __user *buf, > size_t count, loff_t *ppos) > { > struct mdev_device *mdev = device_data; > - struct mdev_parent *parent = mdev->parent; > + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); > > - if (unlikely(!parent->ops->read)) > + if (unlikely(!ops->read)) > return -EINVAL; > > - return parent->ops->read(mdev, buf, count, ppos); > + return ops->read(mdev, buf, count, ppos); > } > > static ssize_t vfio_mdev_write(void *device_data, const char __user *buf, > size_t count, loff_t *ppos) > { > struct mdev_device *mdev = device_data; > - struct mdev_parent *parent = mdev->parent; > + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); > > - if (unlikely(!parent->ops->write)) > + if (unlikely(!ops->write)) > return -EINVAL; > > - return parent->ops->write(mdev, buf, count, ppos); > + return ops->write(mdev, buf, count, ppos); > } > > static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma) > { > struct mdev_device *mdev = device_data; > - struct mdev_parent *parent = mdev->parent; > + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); > > - if (unlikely(!parent->ops->mmap)) > + if (unlikely(!ops->mmap)) > return -EINVAL; > > - return parent->ops->mmap(mdev, vma); > + return ops->mmap(mdev, vma); > } > > static const struct vfio_device_ops vfio_mdev_dev_ops = { > diff --git a/include/linux/mdev.h b/include/linux/mdev.h > index 78b69d09eb54..9e37506d1987 100644 > --- a/include/linux/mdev.h > +++ b/include/linux/mdev.h > @@ -10,7 +10,13 @@ > #ifndef MDEV_H > #define MDEV_H > > +#include <linux/types.h> > +#include <linux/device.h> > +#include <linux/mdev.h> > +#include <uapi/linux/uuid.h> > + > struct mdev_device; > +struct mdev_vfio_device_ops; > > /* > * Called by the parent device driver to set the device which represents > @@ -48,30 +54,7 @@ struct device *mdev_get_iommu_device(struct device *dev); > * @mdev: mdev_device device structure which is being > * destroyed > * Returns integer: success (0) or error (< 0) > - * @open: Open mediated device. > - * @mdev: mediated device. > - * Returns integer: success (0) or error (< 0) > - * @release: release mediated device > - * @mdev: mediated device. > - * @read: Read emulation callback > - * @mdev: mediated device structure > - * @buf: read buffer > - * @count: number of bytes to read > - * @ppos: address. > - * Retuns number on bytes read on success or error. > - * @write: Write emulation callback > - * @mdev: mediated device structure > - * @buf: write buffer > - * @count: number of bytes to be written > - * @ppos: address. > - * Retuns number on bytes written on success or error. > - * @ioctl: IOCTL callback > - * @mdev: mediated device structure > - * @cmd: ioctl command > - * @arg: arguments to ioctl > - * @mmap: mmap callback > - * @mdev: mediated device structure > - * @vma: vma structure > + * > * Parent device that support mediated device should be registered with mdev > * module with mdev_parent_ops structure. > **/ > @@ -83,15 +66,6 @@ struct mdev_parent_ops { > > int (*create)(struct kobject *kobj, struct mdev_device *mdev); > int (*remove)(struct mdev_device *mdev); > - int (*open)(struct mdev_device *mdev); > - void (*release)(struct mdev_device *mdev); > - ssize_t (*read)(struct mdev_device *mdev, char __user *buf, > - size_t count, loff_t *ppos); > - ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, > - size_t count, loff_t *ppos); > - long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, > - unsigned long arg); > - int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); > }; > > /* interface for exporting mdev supported type attributes */ > @@ -135,6 +109,9 @@ void *mdev_get_drvdata(struct mdev_device *mdev); > void mdev_set_drvdata(struct mdev_device *mdev, void *data); > const guid_t *mdev_uuid(struct mdev_device *mdev); > void mdev_set_class(struct mdev_device *mdev, u16 id); > +void mdev_set_vfio_ops(struct mdev_device *mdev, > + const struct mdev_vfio_device_ops *vfio_ops); > +const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev); > > extern struct bus_type mdev_bus_type; > > diff --git a/include/linux/mdev_vfio_ops.h b/include/linux/mdev_vfio_ops.h > new file mode 100644 > index 000000000000..317518f30621 > --- /dev/null > +++ b/include/linux/mdev_vfio_ops.h > @@ -0,0 +1,52 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * VFIO Mediated device definition > + */ > + > +#ifndef MDEV_VFIO_OPS_H > +#define MDEV_VFIO_OPS_H > + > +#include <linux/mdev.h> > + > +/** > + * struct mdev_vfio_device_ops - Structure to be registered for each > + * mdev device to register the device to vfio-mdev module. > + * > + * @open: Open mediated device. > + * @mdev: mediated device. > + * Returns integer: success (0) or error (< 0) > + * @release: release mediated device > + * @mdev: mediated device. > + * @read: Read emulation callback > + * @mdev: mediated device structure > + * @buf: read buffer > + * @count: number of bytes to read > + * @ppos: address. > + * Retuns number on bytes read on success or error. > + * @write: Write emulation callback > + * @mdev: mediated device structure > + * @buf: write buffer > + * @count: number of bytes to be written > + * @ppos: address. > + * Retuns number on bytes written on success or error. > + * @ioctl: IOCTL callback > + * @mdev: mediated device structure > + * @cmd: ioctl command > + * @arg: arguments to ioctl > + * @mmap: mmap callback > + * @mdev: mediated device structure > + * @vma: vma structure > + */ > +struct mdev_vfio_device_ops { > + int (*open)(struct mdev_device *mdev); > + void (*release)(struct mdev_device *mdev); > + ssize_t (*read)(struct mdev_device *mdev, char __user *buf, > + size_t count, loff_t *ppos); > + ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, > + size_t count, loff_t *ppos); > + long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, > + unsigned long arg); > + int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); > +}; > + > +#endif > diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c > index 115bc5074656..12963767ba37 100644 > --- a/samples/vfio-mdev/mbochs.c > +++ b/samples/vfio-mdev/mbochs.c > @@ -30,6 +30,7 @@ > #include <linux/iommu.h> > #include <linux/sysfs.h> > #include <linux/mdev.h> > +#include <linux/mdev_vfio_ops.h> > #include <linux/pci.h> > #include <linux/dma-buf.h> > #include <linux/highmem.h> > @@ -516,6 +517,8 @@ static int mbochs_reset(struct mdev_device *mdev) > return 0; > } > > +static const struct mdev_vfio_device_ops mdev_vfio_ops; > + > static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) > { > const struct mbochs_type *type = mbochs_find_type(kobj); > @@ -561,7 +564,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) > mbochs_reset(mdev); > > mbochs_used_mbytes += type->mbytes; > - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); > return 0; > > err_mem: > @@ -1419,12 +1422,7 @@ static struct attribute_group *mdev_type_groups[] = { > NULL, > }; > > -static const struct mdev_parent_ops mdev_fops = { > - .owner = THIS_MODULE, > - .mdev_attr_groups = mdev_dev_groups, > - .supported_type_groups = mdev_type_groups, > - .create = mbochs_create, > - .remove = mbochs_remove, > +static const struct mdev_vfio_device_ops mdev_vfio_ops = { > .open = mbochs_open, > .release = mbochs_close, > .read = mbochs_read, > @@ -1433,6 +1431,14 @@ static const struct mdev_parent_ops mdev_fops = { > .mmap = mbochs_mmap, > }; > > +static const struct mdev_parent_ops mdev_fops = { > + .owner = THIS_MODULE, > + .mdev_attr_groups = mdev_dev_groups, > + .supported_type_groups = mdev_type_groups, > + .create = mbochs_create, > + .remove = mbochs_remove, > +}; > + > static const struct file_operations vd_fops = { > .owner = THIS_MODULE, > }; > diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c > index 665614574d50..50ee6c98b2af 100644 > --- a/samples/vfio-mdev/mdpy.c > +++ b/samples/vfio-mdev/mdpy.c > @@ -26,6 +26,7 @@ > #include <linux/iommu.h> > #include <linux/sysfs.h> > #include <linux/mdev.h> > +#include <linux/mdev_vfio_ops.h> > #include <linux/pci.h> > #include <drm/drm_fourcc.h> > #include "mdpy-defs.h" > @@ -226,6 +227,8 @@ static int mdpy_reset(struct mdev_device *mdev) > return 0; > } > > +static const struct mdev_vfio_device_ops mdev_vfio_ops; > + > static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) > { > const struct mdpy_type *type = mdpy_find_type(kobj); > @@ -269,7 +272,7 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) > mdpy_reset(mdev); > > mdpy_count++; > - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); > return 0; > } > > @@ -726,12 +729,7 @@ static struct attribute_group *mdev_type_groups[] = { > NULL, > }; > > -static const struct mdev_parent_ops mdev_fops = { > - .owner = THIS_MODULE, > - .mdev_attr_groups = mdev_dev_groups, > - .supported_type_groups = mdev_type_groups, > - .create = mdpy_create, > - .remove = mdpy_remove, > +static const struct mdev_vfio_device_ops mdev_vfio_ops = { > .open = mdpy_open, > .release = mdpy_close, > .read = mdpy_read, > @@ -740,6 +738,14 @@ static const struct mdev_parent_ops mdev_fops = { > .mmap = mdpy_mmap, > }; > > +static const struct mdev_parent_ops mdev_fops = { > + .owner = THIS_MODULE, > + .mdev_attr_groups = mdev_dev_groups, > + .supported_type_groups = mdev_type_groups, > + .create = mdpy_create, > + .remove = mdpy_remove, > +}; > + > static const struct file_operations vd_fops = { > .owner = THIS_MODULE, > }; > diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c > index 90da12ff7fd9..be476e7ad1f8 100644 > --- a/samples/vfio-mdev/mtty.c > +++ b/samples/vfio-mdev/mtty.c > @@ -27,6 +27,7 @@ > #include <linux/ctype.h> > #include <linux/file.h> > #include <linux/mdev.h> > +#include <linux/mdev_vfio_ops.h> > #include <linux/pci.h> > #include <linux/serial.h> > #include <uapi/linux/serial_reg.h> > @@ -708,6 +709,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, > return ret; > } > > +static const struct mdev_vfio_device_ops vfio_dev_ops; > + > static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) > { > struct mdev_state *mdev_state; > @@ -755,7 +758,7 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) > list_add(&mdev_state->next, &mdev_devices_list); > mutex_unlock(&mdev_list_lock); > > - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); > + mdev_set_vfio_ops(mdev, &vfio_dev_ops); > return 0; > } > > @@ -1388,6 +1391,14 @@ static struct attribute_group *mdev_type_groups[] = { > NULL, > }; > > +static const struct mdev_vfio_device_ops vfio_dev_ops = { > + .open = mtty_open, > + .release = mtty_close, > + .read = mtty_read, > + .write = mtty_write, > + .ioctl = mtty_ioctl, > +}; > + > static const struct mdev_parent_ops mdev_fops = { > .owner = THIS_MODULE, > .dev_attr_groups = mtty_dev_groups, > @@ -1395,11 +1406,6 @@ static const struct mdev_parent_ops mdev_fops = { > .supported_type_groups = mdev_type_groups, > .create = mtty_create, > .remove = mtty_remove, > - .open = mtty_open, > - .release = mtty_close, > - .read = mtty_read, > - .write = mtty_write, > - .ioctl = mtty_ioctl, > }; > > static void mtty_device_release(struct device *dev)
On 2019/11/5 上午5:50, Alex Williamson wrote: >> EXPORT_SYMBOL(mdev_set_drvdata); >> >> + > Extra whitespace > >> /* Specify the class for the mdev device, this must be called during >> - * create() callback. >> - */ >> + * create() callback explicitly or implicity through the helpers > s/implicity/implicitly/ > >> + * provided by each class. */ >> void mdev_set_class(struct mdev_device *mdev, u16 id) >> { >> WARN_ON(mdev->class_id); >> @@ -55,6 +56,26 @@ void mdev_set_class(struct mdev_device *mdev, u16 id) >> } >> EXPORT_SYMBOL(mdev_set_class); >> >> +/* Specify the mdev device to be a VFIO mdev device, and set VFIO >> + * device ops for it. This must be called from the create() callback >> + * for VFIO mdev device. >> + */ > Comment style. Thanks, Will fix them all. Thanks > > Alex >
diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index 6709413bee29..e35f1f8f946e 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -152,15 +152,6 @@ callbacks per mdev parent device, per mdev type, or any other categorization. Vendor drivers are expected to be fully asynchronous in this respect or provide their own internal resource protection.) -The callbacks in the mdev_parent_ops structure are as follows: - -* open: open callback of mediated device -* close: close callback of mediated device -* ioctl: ioctl callback of mediated device -* read : read emulation callback -* write: write emulation callback -* mmap: mmap emulation callback - A driver should use the mdev_parent_ops structure in the function call to register itself with the mdev core driver:: @@ -172,10 +163,34 @@ that a driver should use to unregister itself with the mdev core driver:: extern void mdev_unregister_device(struct device *dev); -It is also required to specify the class_id in create() callback through:: +As multiple types of mediated devices may be supported, class id needs +to be specified in the create callback(). This could be done +explicitly for the device that does not use on mdev bus for its +operation through: int mdev_set_class(struct mdev_device *mdev, u16 id); +For the device that uses on the mdev bus for its operation, the class +should provide helper function to set class id and device specific +ops. E.g for vfio-mdev devices, the function to be called is:: + + int mdev_set_vfio_ops(struct mdev_device *mdev, + const struct mdev_vfio_device_ops *vfio_ops); + +The class id (set by this function to MDEV_CLASS_ID_VFIO) is used to +match a device with an mdev driver via its id table. The device +specific callbacks (specified in *vfio_ops) are obtainable via +mdev_get_vfio_ops() (for use by the mdev bus driver). A vfio-mdev +device (class id MDEV_CLASS_ID_VFIO) uses the following +device-specific ops: + +* open: open callback of vfio mediated device +* close: close callback of vfio mediated device +* ioctl: ioctl callback of vfio mediated device +* read : read emulation callback +* write: write emulation callback +* mmap: mmap emulation callback + Mediated Device Management Interface Through sysfs ================================================== diff --git a/MAINTAINERS b/MAINTAINERS index cba1095547fd..f661d13344d6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17121,6 +17121,7 @@ S: Maintained F: Documentation/driver-api/vfio-mediated-device.rst F: drivers/vfio/mdev/ F: include/linux/mdev.h +F: include/linux/mdev_vfio_ops.h F: samples/vfio-mdev/ VFIO PLATFORM DRIVER diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 6420f0dbd31b..662f3a672372 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -42,6 +42,7 @@ #include <linux/kvm_host.h> #include <linux/vfio.h> #include <linux/mdev.h> +#include <linux/mdev_vfio_ops.h> #include <linux/debugfs.h> #include <linux/nospec.h> @@ -643,6 +644,8 @@ static void kvmgt_put_vfio_device(void *vgpu) vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device); } +static const struct mdev_vfio_device_ops intel_vfio_vgpu_dev_ops; + static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) { struct intel_vgpu *vgpu = NULL; @@ -678,7 +681,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) dev_name(mdev_dev(mdev))); ret = 0; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &intel_vfio_vgpu_dev_ops); out: return ret; } @@ -1599,20 +1602,21 @@ static const struct attribute_group *intel_vgpu_groups[] = { NULL, }; -static struct mdev_parent_ops intel_vgpu_ops = { - .mdev_attr_groups = intel_vgpu_groups, - .create = intel_vgpu_create, - .remove = intel_vgpu_remove, - +static const struct mdev_vfio_device_ops intel_vfio_vgpu_dev_ops = { .open = intel_vgpu_open, .release = intel_vgpu_release, - .read = intel_vgpu_read, .write = intel_vgpu_write, .mmap = intel_vgpu_mmap, .ioctl = intel_vgpu_ioctl, }; +static struct mdev_parent_ops intel_vgpu_ops = { + .mdev_attr_groups = intel_vgpu_groups, + .create = intel_vgpu_create, + .remove = intel_vgpu_remove, +}; + static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops) { struct attribute **kvm_type_attrs; diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index cf2c013ae32f..fa473ded71c7 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -12,6 +12,7 @@ #include <linux/vfio.h> #include <linux/mdev.h> +#include <linux/mdev_vfio_ops.h> #include <linux/nospec.h> #include <linux/slab.h> @@ -110,6 +111,8 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct vfio_ccw_private *private = @@ -129,7 +132,7 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) private->sch->schid.ssid, private->sch->schid.sch_no); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; } @@ -575,11 +578,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, } } -static const struct mdev_parent_ops vfio_ccw_mdev_ops = { - .owner = THIS_MODULE, - .supported_type_groups = mdev_type_groups, - .create = vfio_ccw_mdev_create, - .remove = vfio_ccw_mdev_remove, +static const struct mdev_vfio_device_ops mdev_vfio_ops = { .open = vfio_ccw_mdev_open, .release = vfio_ccw_mdev_release, .read = vfio_ccw_mdev_read, @@ -587,6 +586,13 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = { .ioctl = vfio_ccw_mdev_ioctl, }; +static const struct mdev_parent_ops vfio_ccw_mdev_ops = { + .owner = THIS_MODULE, + .supported_type_groups = mdev_type_groups, + .create = vfio_ccw_mdev_create, + .remove = vfio_ccw_mdev_remove, +}; + int vfio_ccw_mdev_reg(struct subchannel *sch) { return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops); diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 07c31070afeb..7bdc62393112 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -16,6 +16,7 @@ #include <linux/bitops.h> #include <linux/kvm_host.h> #include <linux/module.h> +#include <linux/mdev_vfio_ops.h> #include <asm/kvm.h> #include <asm/zcrypt.h> @@ -321,6 +322,8 @@ static void vfio_ap_matrix_init(struct ap_config_info *info, matrix->adm_max = info->apxa ? info->Nd : 15; } +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct ap_matrix_mdev *matrix_mdev; @@ -343,7 +346,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&matrix_mdev->node, &matrix_dev->mdev_list); mutex_unlock(&matrix_dev->lock); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; } @@ -1281,15 +1284,18 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev, return ret; } +static const struct mdev_vfio_device_ops mdev_vfio_ops = { + .open = vfio_ap_mdev_open, + .release = vfio_ap_mdev_release, + .ioctl = vfio_ap_mdev_ioctl, +}; + static const struct mdev_parent_ops vfio_ap_matrix_ops = { .owner = THIS_MODULE, .supported_type_groups = vfio_ap_mdev_type_groups, .mdev_attr_groups = vfio_ap_mdev_attr_groups, .create = vfio_ap_mdev_create, .remove = vfio_ap_mdev_remove, - .open = vfio_ap_mdev_open, - .release = vfio_ap_mdev_release, - .ioctl = vfio_ap_mdev_ioctl, }; int vfio_ap_mdev_register(void) diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index d23ca39e3be6..8d579d7ed82f 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -45,9 +45,10 @@ void mdev_set_drvdata(struct mdev_device *mdev, void *data) } EXPORT_SYMBOL(mdev_set_drvdata); + /* Specify the class for the mdev device, this must be called during - * create() callback. - */ + * create() callback explicitly or implicity through the helpers + * provided by each class. */ void mdev_set_class(struct mdev_device *mdev, u16 id) { WARN_ON(mdev->class_id); @@ -55,6 +56,26 @@ void mdev_set_class(struct mdev_device *mdev, u16 id) } EXPORT_SYMBOL(mdev_set_class); +/* Specify the mdev device to be a VFIO mdev device, and set VFIO + * device ops for it. This must be called from the create() callback + * for VFIO mdev device. + */ +void mdev_set_vfio_ops(struct mdev_device *mdev, + const struct mdev_vfio_device_ops *vfio_ops) +{ + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev->vfio_ops = vfio_ops; +} +EXPORT_SYMBOL(mdev_set_vfio_ops); + +/* Get the VFIO device ops for the mdev device. */ +const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev) +{ + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VFIO); + return mdev->vfio_ops; +} +EXPORT_SYMBOL(mdev_get_vfio_ops); + struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index c65f436c1869..411227373625 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -10,6 +10,8 @@ #ifndef MDEV_PRIVATE_H #define MDEV_PRIVATE_H +#include <linux/mdev_vfio_ops.h> + int mdev_bus_register(void); void mdev_bus_unregister(void); @@ -34,6 +36,9 @@ struct mdev_device { struct device *iommu_device; bool active; u16 class_id; + union { + const struct mdev_vfio_device_ops *vfio_ops; + }; }; #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index a6641cd8b5a3..c01e2194e4b3 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -14,6 +14,7 @@ #include <linux/slab.h> #include <linux/vfio.h> #include <linux/mdev.h> +#include <linux/mdev_vfio_ops.h> #include "mdev_private.h" @@ -24,16 +25,16 @@ static int vfio_mdev_open(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); int ret; - if (unlikely(!parent->ops->open)) + if (unlikely(!ops->open)) return -EINVAL; if (!try_module_get(THIS_MODULE)) return -ENODEV; - ret = parent->ops->open(mdev); + ret = ops->open(mdev); if (ret) module_put(THIS_MODULE); @@ -43,10 +44,10 @@ static int vfio_mdev_open(void *device_data) static void vfio_mdev_release(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); - if (likely(parent->ops->release)) - parent->ops->release(mdev); + if (likely(ops->release)) + ops->release(mdev); module_put(THIS_MODULE); } @@ -55,47 +56,47 @@ static long vfio_mdev_unlocked_ioctl(void *device_data, unsigned int cmd, unsigned long arg) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->ioctl)) + if (unlikely(!ops->ioctl)) return -EINVAL; - return parent->ops->ioctl(mdev, cmd, arg); + return ops->ioctl(mdev, cmd, arg); } static ssize_t vfio_mdev_read(void *device_data, char __user *buf, size_t count, loff_t *ppos) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->read)) + if (unlikely(!ops->read)) return -EINVAL; - return parent->ops->read(mdev, buf, count, ppos); + return ops->read(mdev, buf, count, ppos); } static ssize_t vfio_mdev_write(void *device_data, const char __user *buf, size_t count, loff_t *ppos) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->write)) + if (unlikely(!ops->write)) return -EINVAL; - return parent->ops->write(mdev, buf, count, ppos); + return ops->write(mdev, buf, count, ppos); } static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_ops(mdev); - if (unlikely(!parent->ops->mmap)) + if (unlikely(!ops->mmap)) return -EINVAL; - return parent->ops->mmap(mdev, vma); + return ops->mmap(mdev, vma); } static const struct vfio_device_ops vfio_mdev_dev_ops = { diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 78b69d09eb54..9e37506d1987 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -10,7 +10,13 @@ #ifndef MDEV_H #define MDEV_H +#include <linux/types.h> +#include <linux/device.h> +#include <linux/mdev.h> +#include <uapi/linux/uuid.h> + struct mdev_device; +struct mdev_vfio_device_ops; /* * Called by the parent device driver to set the device which represents @@ -48,30 +54,7 @@ struct device *mdev_get_iommu_device(struct device *dev); * @mdev: mdev_device device structure which is being * destroyed * Returns integer: success (0) or error (< 0) - * @open: Open mediated device. - * @mdev: mediated device. - * Returns integer: success (0) or error (< 0) - * @release: release mediated device - * @mdev: mediated device. - * @read: Read emulation callback - * @mdev: mediated device structure - * @buf: read buffer - * @count: number of bytes to read - * @ppos: address. - * Retuns number on bytes read on success or error. - * @write: Write emulation callback - * @mdev: mediated device structure - * @buf: write buffer - * @count: number of bytes to be written - * @ppos: address. - * Retuns number on bytes written on success or error. - * @ioctl: IOCTL callback - * @mdev: mediated device structure - * @cmd: ioctl command - * @arg: arguments to ioctl - * @mmap: mmap callback - * @mdev: mediated device structure - * @vma: vma structure + * * Parent device that support mediated device should be registered with mdev * module with mdev_parent_ops structure. **/ @@ -83,15 +66,6 @@ struct mdev_parent_ops { int (*create)(struct kobject *kobj, struct mdev_device *mdev); int (*remove)(struct mdev_device *mdev); - int (*open)(struct mdev_device *mdev); - void (*release)(struct mdev_device *mdev); - ssize_t (*read)(struct mdev_device *mdev, char __user *buf, - size_t count, loff_t *ppos); - ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, - size_t count, loff_t *ppos); - long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, - unsigned long arg); - int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); }; /* interface for exporting mdev supported type attributes */ @@ -135,6 +109,9 @@ void *mdev_get_drvdata(struct mdev_device *mdev); void mdev_set_drvdata(struct mdev_device *mdev, void *data); const guid_t *mdev_uuid(struct mdev_device *mdev); void mdev_set_class(struct mdev_device *mdev, u16 id); +void mdev_set_vfio_ops(struct mdev_device *mdev, + const struct mdev_vfio_device_ops *vfio_ops); +const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev); extern struct bus_type mdev_bus_type; diff --git a/include/linux/mdev_vfio_ops.h b/include/linux/mdev_vfio_ops.h new file mode 100644 index 000000000000..317518f30621 --- /dev/null +++ b/include/linux/mdev_vfio_ops.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * VFIO Mediated device definition + */ + +#ifndef MDEV_VFIO_OPS_H +#define MDEV_VFIO_OPS_H + +#include <linux/mdev.h> + +/** + * struct mdev_vfio_device_ops - Structure to be registered for each + * mdev device to register the device to vfio-mdev module. + * + * @open: Open mediated device. + * @mdev: mediated device. + * Returns integer: success (0) or error (< 0) + * @release: release mediated device + * @mdev: mediated device. + * @read: Read emulation callback + * @mdev: mediated device structure + * @buf: read buffer + * @count: number of bytes to read + * @ppos: address. + * Retuns number on bytes read on success or error. + * @write: Write emulation callback + * @mdev: mediated device structure + * @buf: write buffer + * @count: number of bytes to be written + * @ppos: address. + * Retuns number on bytes written on success or error. + * @ioctl: IOCTL callback + * @mdev: mediated device structure + * @cmd: ioctl command + * @arg: arguments to ioctl + * @mmap: mmap callback + * @mdev: mediated device structure + * @vma: vma structure + */ +struct mdev_vfio_device_ops { + int (*open)(struct mdev_device *mdev); + void (*release)(struct mdev_device *mdev); + ssize_t (*read)(struct mdev_device *mdev, char __user *buf, + size_t count, loff_t *ppos); + ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, + size_t count, loff_t *ppos); + long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, + unsigned long arg); + int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); +}; + +#endif diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index 115bc5074656..12963767ba37 100644 --- a/samples/vfio-mdev/mbochs.c +++ b/samples/vfio-mdev/mbochs.c @@ -30,6 +30,7 @@ #include <linux/iommu.h> #include <linux/sysfs.h> #include <linux/mdev.h> +#include <linux/mdev_vfio_ops.h> #include <linux/pci.h> #include <linux/dma-buf.h> #include <linux/highmem.h> @@ -516,6 +517,8 @@ static int mbochs_reset(struct mdev_device *mdev) return 0; } +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mbochs_type *type = mbochs_find_type(kobj); @@ -561,7 +564,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) mbochs_reset(mdev); mbochs_used_mbytes += type->mbytes; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; err_mem: @@ -1419,12 +1422,7 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; -static const struct mdev_parent_ops mdev_fops = { - .owner = THIS_MODULE, - .mdev_attr_groups = mdev_dev_groups, - .supported_type_groups = mdev_type_groups, - .create = mbochs_create, - .remove = mbochs_remove, +static const struct mdev_vfio_device_ops mdev_vfio_ops = { .open = mbochs_open, .release = mbochs_close, .read = mbochs_read, @@ -1433,6 +1431,14 @@ static const struct mdev_parent_ops mdev_fops = { .mmap = mbochs_mmap, }; +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mbochs_create, + .remove = mbochs_remove, +}; + static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c index 665614574d50..50ee6c98b2af 100644 --- a/samples/vfio-mdev/mdpy.c +++ b/samples/vfio-mdev/mdpy.c @@ -26,6 +26,7 @@ #include <linux/iommu.h> #include <linux/sysfs.h> #include <linux/mdev.h> +#include <linux/mdev_vfio_ops.h> #include <linux/pci.h> #include <drm/drm_fourcc.h> #include "mdpy-defs.h" @@ -226,6 +227,8 @@ static int mdpy_reset(struct mdev_device *mdev) return 0; } +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mdpy_type *type = mdpy_find_type(kobj); @@ -269,7 +272,7 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) mdpy_reset(mdev); mdpy_count++; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; } @@ -726,12 +729,7 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; -static const struct mdev_parent_ops mdev_fops = { - .owner = THIS_MODULE, - .mdev_attr_groups = mdev_dev_groups, - .supported_type_groups = mdev_type_groups, - .create = mdpy_create, - .remove = mdpy_remove, +static const struct mdev_vfio_device_ops mdev_vfio_ops = { .open = mdpy_open, .release = mdpy_close, .read = mdpy_read, @@ -740,6 +738,14 @@ static const struct mdev_parent_ops mdev_fops = { .mmap = mdpy_mmap, }; +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mdpy_create, + .remove = mdpy_remove, +}; + static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 90da12ff7fd9..be476e7ad1f8 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -27,6 +27,7 @@ #include <linux/ctype.h> #include <linux/file.h> #include <linux/mdev.h> +#include <linux/mdev_vfio_ops.h> #include <linux/pci.h> #include <linux/serial.h> #include <uapi/linux/serial_reg.h> @@ -708,6 +709,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, return ret; } +static const struct mdev_vfio_device_ops vfio_dev_ops; + static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) { struct mdev_state *mdev_state; @@ -755,7 +758,7 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&mdev_state->next, &mdev_devices_list); mutex_unlock(&mdev_list_lock); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_dev_ops); return 0; } @@ -1388,6 +1391,14 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct mdev_vfio_device_ops vfio_dev_ops = { + .open = mtty_open, + .release = mtty_close, + .read = mtty_read, + .write = mtty_write, + .ioctl = mtty_ioctl, +}; + static const struct mdev_parent_ops mdev_fops = { .owner = THIS_MODULE, .dev_attr_groups = mtty_dev_groups, @@ -1395,11 +1406,6 @@ static const struct mdev_parent_ops mdev_fops = { .supported_type_groups = mdev_type_groups, .create = mtty_create, .remove = mtty_remove, - .open = mtty_open, - .release = mtty_close, - .read = mtty_read, - .write = mtty_write, - .ioctl = mtty_ioctl, }; static void mtty_device_release(struct device *dev)