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vfio/mdev: simplify mdev_type handling

Browse Source 
Instead of abusing struct attribute_group to control initialization of
struct mdev_type, just define the actual attributes in the mdev_driver,
allocate the mdev_type structures in the caller and pass them to
mdev_register_parent.

This allows the caller to use container_of to get at the containing
structure and thus significantly simplify the code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Link: https://lore.kernel.org/r/20220923092652.100656-6-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Christoph Hellwig 2022-09-23 11:26:43 +02:00 committed by Alex Williamson
parent 89345d5177
commit da44c340c4
17 changed files with 165 additions and 326 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/driver-api/vfio-mediated-device.rst
View File

@ -103,7 +103,7 @@ structure to represent a mediated device's driver::
struct mdev_driver {
int (*probe) (struct mdev_device *dev);
void (*remove) (struct mdev_device *dev);
struct attribute_group **supported_type_groups;
const struct attribute * const *types_attrs;
struct device_driver driver;
};

3
drivers/gpu/drm/i915/gvt/gvt.h
View File

@ -310,8 +310,8 @@ struct intel_vgpu_config {
const char *name;
};
#define NR_MAX_INTEL_VGPU_TYPES 20
struct intel_vgpu_type {
struct mdev_type type;
char name[16];
const struct intel_vgpu_config *conf;
unsigned int avail_instance;
@ -339,6 +339,7 @@ struct intel_gvt {
struct notifier_block shadow_ctx_notifier_block[I915_NUM_ENGINES];
DECLARE_HASHTABLE(cmd_table, GVT_CMD_HASH_BITS);
struct mdev_parent parent;
struct mdev_type **mdev_types;
struct intel_vgpu_type *types;
unsigned int num_types;
struct intel_vgpu *idle_vgpu;

102
drivers/gpu/drm/i915/gvt/kvmgt.c
View File

@ -117,17 +117,10 @@ static ssize_t available_instances_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr,
char *buf)
{
struct intel_vgpu_type *type;
unsigned int num = 0;
struct intel_gvt *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
struct intel_vgpu_type *type =
container_of(mtype, struct intel_vgpu_type, type);
type = &gvt->types[mtype_get_type_group_id(mtype)];
if (!type)
num = 0;
else
num = type->avail_instance;
return sprintf(buf, "%u\n", num);
return sprintf(buf, "%u\n", type->avail_instance);
}
static ssize_t device_api_show(struct mdev_type *mtype,
@ -139,12 +132,8 @@ static ssize_t device_api_show(struct mdev_type *mtype,
static ssize_t description_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
struct intel_vgpu_type *type;
struct intel_gvt *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
type = &gvt->types[mtype_get_type_group_id(mtype)];
if (!type)
return 0;
struct intel_vgpu_type *type =
container_of(mtype, struct intel_vgpu_type, type);
return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
"fence: %d\nresolution: %s\n"
@ -158,14 +147,7 @@ static ssize_t description_show(struct mdev_type *mtype,
static ssize_t name_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
struct intel_vgpu_type *type;
struct intel_gvt *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
type = &gvt->types[mtype_get_type_group_id(mtype)];
if (!type)
return 0;
return sprintf(buf, "%s\n", type->name);
return sprintf(buf, "%s\n", mtype->sysfs_name);
}
static MDEV_TYPE_ATTR_RO(available_instances);
@ -173,7 +155,7 @@ static MDEV_TYPE_ATTR_RO(device_api);
static MDEV_TYPE_ATTR_RO(description);
static MDEV_TYPE_ATTR_RO(name);
static struct attribute *gvt_type_attrs[] = {
static const struct attribute *gvt_type_attrs[] = {
&mdev_type_attr_available_instances.attr,
&mdev_type_attr_device_api.attr,
&mdev_type_attr_description.attr,
@ -181,51 +163,6 @@ static struct attribute *gvt_type_attrs[] = {
NULL,
};
static struct attribute_group *gvt_vgpu_type_groups[] = {
[0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
};
static int intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
{
int i, j;
struct intel_vgpu_type *type;
struct attribute_group *group;
for (i = 0; i < gvt->num_types; i++) {
type = &gvt->types[i];
group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
if (!group)
goto unwind;
group->name = type->name;
group->attrs = gvt_type_attrs;
gvt_vgpu_type_groups[i] = group;
}
return 0;
unwind:
for (j = 0; j < i; j++) {
group = gvt_vgpu_type_groups[j];
kfree(group);
}
return -ENOMEM;
}
static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
{
int i;
struct attribute_group *group;
for (i = 0; i < gvt->num_types; i++) {
group = gvt_vgpu_type_groups[i];
gvt_vgpu_type_groups[i] = NULL;
kfree(group);
}
}
static void gvt_unpin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
unsigned long size)
{
@ -1547,16 +1484,11 @@ static const struct attribute_group *intel_vgpu_groups[] = {
static int intel_vgpu_init_dev(struct vfio_device *vfio_dev)
{
struct mdev_device *mdev = to_mdev_device(vfio_dev->dev);
struct device *pdev = mdev_parent_dev(mdev);
struct intel_gvt *gvt = kdev_to_i915(pdev)->gvt;
struct intel_vgpu_type *type;
struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
struct intel_vgpu_type *type =
container_of(mdev->type, struct intel_vgpu_type, type);
type = &gvt->types[mdev_get_type_group_id(mdev)];
if (!type)
return -EINVAL;
vgpu->gvt = gvt;
vgpu->gvt = kdev_to_i915(mdev_parent_dev(mdev))->gvt;
return intel_gvt_create_vgpu(vgpu, type->conf);
}
@ -1625,7 +1557,7 @@ static struct mdev_driver intel_vgpu_mdev_driver = {
},
.probe = intel_vgpu_probe,
.remove = intel_vgpu_remove,
.supported_type_groups = gvt_vgpu_type_groups,
.types_attrs = gvt_type_attrs,
};
int intel_gvt_page_track_add(struct intel_vgpu *info, u64 gfn)
@ -1924,7 +1856,6 @@ static void intel_gvt_clean_device(struct drm_i915_private *i915)
return;
mdev_unregister_parent(&gvt->parent);
intel_gvt_cleanup_vgpu_type_groups(gvt);
intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
intel_gvt_clean_vgpu_types(gvt);
@ -2024,20 +1955,15 @@ static int intel_gvt_init_device(struct drm_i915_private *i915)
intel_gvt_debugfs_init(gvt);
ret = intel_gvt_init_vgpu_type_groups(gvt);
ret = mdev_register_parent(&gvt->parent, i915->drm.dev,
&intel_vgpu_mdev_driver,
gvt->mdev_types, gvt->num_types);
if (ret)
goto out_destroy_idle_vgpu;
ret = mdev_register_parent(&gvt->parent, i915->drm.dev,
&intel_vgpu_mdev_driver);
if (ret)
goto out_cleanup_vgpu_type_groups;
gvt_dbg_core("gvt device initialization is done\n");
return 0;
out_cleanup_vgpu_type_groups:
intel_gvt_cleanup_vgpu_type_groups(gvt);
out_destroy_idle_vgpu:
intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu);
intel_gvt_debugfs_clean(gvt);

13
drivers/gpu/drm/i915/gvt/vgpu.c
View File

@ -113,13 +113,18 @@ int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
if (!gvt->types)
return -ENOMEM;
gvt->mdev_types = kcalloc(num_types, sizeof(*gvt->mdev_types),
GFP_KERNEL);
if (!gvt->mdev_types)
goto out_free_types;
for (i = 0; i < num_types; ++i) {
const struct intel_vgpu_config *conf = &intel_vgpu_configs[i];
if (low_avail / conf->low_mm == 0)
break;
if (conf->weight < 1 || conf->weight > VGPU_MAX_WEIGHT)
goto out_free_types;
goto out_free_mdev_types;
sprintf(gvt->types[i].name, "GVTg_V%u_%s",
GRAPHICS_VER(gvt->gt->i915) == 8 ? 4 : 5, conf->name);
@ -131,11 +136,16 @@ int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
i, gvt->types[i].name, gvt->types[i].avail_instance,
conf->low_mm, conf->high_mm, conf->fence,
conf->weight, vgpu_edid_str(conf->edid));
gvt->mdev_types[i] = &gvt->types[i].type;
gvt->mdev_types[i]->sysfs_name = gvt->types[i].name;
}
gvt->num_types = i;
return 0;
out_free_mdev_types:
kfree(gvt->mdev_types);
out_free_types:
kfree(gvt->types);
return -EINVAL;
@ -143,6 +153,7 @@ out_free_types:
void intel_gvt_clean_vgpu_types(struct intel_gvt *gvt)
{
kfree(gvt->mdev_types);
kfree(gvt->types);
}

6
drivers/s390/cio/vfio_ccw_drv.c
View File

@ -202,7 +202,6 @@ static void vfio_ccw_free_private(struct vfio_ccw_private *private)
mutex_destroy(&private->io_mutex);
kfree(private);
}
static int vfio_ccw_sch_probe(struct subchannel *sch)
{
struct pmcw *pmcw = &sch->schib.pmcw;
@ -221,8 +220,11 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
dev_set_drvdata(&sch->dev, private);
private->mdev_type.sysfs_name = "io";
private->mdev_types[0] = &private->mdev_type;
ret = mdev_register_parent(&private->parent, &sch->dev,
&vfio_ccw_mdev_driver);
&vfio_ccw_mdev_driver,
private->mdev_types, 1);
if (ret)
goto out_free;

14
drivers/s390/cio/vfio_ccw_ops.c
View File

@ -69,23 +69,13 @@ static ssize_t available_instances_show(struct mdev_type *mtype,
}
static MDEV_TYPE_ATTR_RO(available_instances);
static struct attribute *mdev_types_attrs[] = {
static const struct attribute *mdev_types_attrs[] = {
&mdev_type_attr_name.attr,
&mdev_type_attr_device_api.attr,
&mdev_type_attr_available_instances.attr,
NULL,
};
static struct attribute_group mdev_type_group = {
.name = "io",
.attrs = mdev_types_attrs,
};
static struct attribute_group *mdev_type_groups[] = {
&mdev_type_group,
NULL,
};
static int vfio_ccw_mdev_init_dev(struct vfio_device *vdev)
{
struct vfio_ccw_private *private =
@ -646,5 +636,5 @@ struct mdev_driver vfio_ccw_mdev_driver = {
},
.probe = vfio_ccw_mdev_probe,
.remove = vfio_ccw_mdev_remove,
.supported_type_groups = mdev_type_groups,
.types_attrs = mdev_types_attrs,
};

2
drivers/s390/cio/vfio_ccw_private.h
View File

@ -120,6 +120,8 @@ struct vfio_ccw_private {
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);

19
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -816,23 +816,13 @@ static ssize_t device_api_show(struct mdev_type *mtype,
static MDEV_TYPE_ATTR_RO(device_api);
static struct attribute *vfio_ap_mdev_type_attrs[] = {
static const struct attribute *vfio_ap_mdev_type_attrs[] = {
&mdev_type_attr_name.attr,
&mdev_type_attr_device_api.attr,
&mdev_type_attr_available_instances.attr,
NULL,
};
static struct attribute_group vfio_ap_mdev_hwvirt_type_group = {
.name = VFIO_AP_MDEV_TYPE_HWVIRT,
.attrs = vfio_ap_mdev_type_attrs,
};
static struct attribute_group *vfio_ap_mdev_type_groups[] = {
&vfio_ap_mdev_hwvirt_type_group,
NULL,
};
#define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \
"already assigned to %s"
@ -1817,7 +1807,7 @@ static struct mdev_driver vfio_ap_matrix_driver = {
},
.probe = vfio_ap_mdev_probe,
.remove = vfio_ap_mdev_remove,
.supported_type_groups = vfio_ap_mdev_type_groups,
.types_attrs = vfio_ap_mdev_type_attrs,
};
int vfio_ap_mdev_register(void)
@ -1830,8 +1820,11 @@ int vfio_ap_mdev_register(void)
if (ret)
return ret;
matrix_dev->mdev_type.sysfs_name = VFIO_AP_MDEV_TYPE_HWVIRT;
matrix_dev->mdev_types[0] = &matrix_dev->mdev_type;
ret = mdev_register_parent(&matrix_dev->parent, &matrix_dev->device,
&vfio_ap_matrix_driver);
&vfio_ap_matrix_driver,
matrix_dev->mdev_types, 1);
if (ret)
goto err_driver;
return 0;

2
drivers/s390/crypto/vfio_ap_private.h
View File

@ -53,6 +53,8 @@ struct ap_matrix_dev {
struct ap_driver *vfio_ap_drv;
struct mutex guests_lock; /* serializes access to each KVM guest */
struct mdev_parent parent;
struct mdev_type mdev_type;
struct mdev_type *mdev_types[];
};
extern struct ap_matrix_dev *matrix_dev;

31
drivers/vfio/mdev/mdev_core.c
View File

@ -29,26 +29,6 @@ struct device *mdev_parent_dev(struct mdev_device *mdev)
}
EXPORT_SYMBOL(mdev_parent_dev);
/*
* Return the index in supported_type_groups that this mdev_device was created
* from.
*/
unsigned int mdev_get_type_group_id(struct mdev_device *mdev)
{
return mdev->type->type_group_id;
}
EXPORT_SYMBOL(mdev_get_type_group_id);
/*
* Used in mdev_type_attribute sysfs functions to return the index in the
* supported_type_groups that the sysfs is called from.
*/
unsigned int mtype_get_type_group_id(struct mdev_type *mtype)
{
return mtype->type_group_id;
}
EXPORT_SYMBOL(mtype_get_type_group_id);
/*
* Used in mdev_type_attribute sysfs functions to return the parent struct
* device
@ -85,6 +65,8 @@ static int mdev_device_remove_cb(struct device *dev, void *data)
* @parent: parent structure registered
* @dev: device structure representing parent device.
* @mdev_driver: Device driver to bind to the newly created mdev
* @types: Array of supported mdev types
* @nr_types: Number of entries in @types
*
* Registers the @parent stucture as a parent for mdev types and thus mdev
* devices. The caller needs to hold a reference on @dev that must not be
@ -93,20 +75,19 @@ static int mdev_device_remove_cb(struct device *dev, void *data)
* Returns a negative value on error, otherwise 0.
*/
int mdev_register_parent(struct mdev_parent *parent, struct device *dev,
struct mdev_driver *mdev_driver)
struct mdev_driver *mdev_driver, struct mdev_type **types,
unsigned int nr_types)
{
char *env_string = "MDEV_STATE=registered";
char *envp[] = { env_string, NULL };
int ret;
/* check for mandatory ops */
if (!mdev_driver->supported_type_groups)
return -EINVAL;
memset(parent, 0, sizeof(*parent));
init_rwsem(&parent->unreg_sem);
parent->dev = dev;
parent->mdev_driver = mdev_driver;
parent->types = types;
parent->nr_types = nr_types;
if (!mdev_bus_compat_class) {
mdev_bus_compat_class = class_compat_register("mdev_bus");

5
drivers/vfio/mdev/mdev_driver.c
View File

@ -56,10 +56,9 @@ EXPORT_SYMBOL_GPL(mdev_bus_type);
**/
int mdev_register_driver(struct mdev_driver *drv)
{
/* initialize common driver fields */
if (!drv->types_attrs)
return -EINVAL;
drv->driver.bus = &mdev_bus_type;
/* register with core */
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(mdev_register_driver);

8
drivers/vfio/mdev/mdev_private.h
View File

@ -13,14 +13,6 @@
int mdev_bus_register(void);
void mdev_bus_unregister(void);
struct mdev_type {
struct kobject kobj;
struct kobject *devices_kobj;
struct mdev_parent *parent;
struct list_head next;
unsigned int type_group_id;
};
extern const struct attribute_group *mdev_device_groups[];
#define to_mdev_type_attr(_attr) \

91
drivers/vfio/mdev/mdev_sysfs.c
View File

@ -82,7 +82,6 @@ static void mdev_type_release(struct kobject *kobj)
pr_debug("Releasing group %s\n", kobj->name);
/* Pairs with the get in add_mdev_supported_type() */
put_device(type->parent->dev);
kfree(type);
}
static struct kobj_type mdev_type_ktype = {
@ -90,35 +89,21 @@ static struct kobj_type mdev_type_ktype = {
.release = mdev_type_release,
};
static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
unsigned int type_group_id)
static int mdev_type_add(struct mdev_parent *parent, struct mdev_type *type)
{
struct mdev_type *type;
struct attribute_group *group =
parent->mdev_driver->supported_type_groups[type_group_id];
int ret;
if (!group->name) {
pr_err("%s: Type name empty!\n", __func__);
return ERR_PTR(-EINVAL);
}
type = kzalloc(sizeof(*type), GFP_KERNEL);
if (!type)
return ERR_PTR(-ENOMEM);
type->kobj.kset = parent->mdev_types_kset;
type->parent = parent;
/* Pairs with the put in mdev_type_release() */
get_device(parent->dev);
type->type_group_id = type_group_id;
ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
"%s-%s", dev_driver_string(parent->dev),
group->name);
type->sysfs_name);
if (ret) {
kobject_put(&type->kobj);
return ERR_PTR(ret);
return ret;
}
ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr);
@ -131,13 +116,10 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
goto attr_devices_failed;
}
ret = sysfs_create_files(&type->kobj,
(const struct attribute **)group->attrs);
if (ret) {
ret = -ENOMEM;
ret = sysfs_create_files(&type->kobj, parent->mdev_driver->types_attrs);
if (ret)
goto attrs_failed;
}
return type;
return 0;
attrs_failed:
kobject_put(type->devices_kobj);
@ -146,78 +128,49 @@ attr_devices_failed:
attr_create_failed:
kobject_del(&type->kobj);
kobject_put(&type->kobj);
return ERR_PTR(ret);
return ret;
}
static void remove_mdev_supported_type(struct mdev_type *type)
static void mdev_type_remove(struct mdev_type *type)
{
struct attribute_group *group =
type->parent->mdev_driver->supported_type_groups[type->type_group_id];
sysfs_remove_files(&type->kobj, type->parent->mdev_driver->types_attrs);
sysfs_remove_files(&type->kobj,
(const struct attribute **)group->attrs);
kobject_put(type->devices_kobj);
sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
kobject_del(&type->kobj);
kobject_put(&type->kobj);
}
static int add_mdev_supported_type_groups(struct mdev_parent *parent)
{
int i;
for (i = 0; parent->mdev_driver->supported_type_groups[i]; i++) {
struct mdev_type *type;
type = add_mdev_supported_type(parent, i);
if (IS_ERR(type)) {
struct mdev_type *ltype, *tmp;
list_for_each_entry_safe(ltype, tmp, &parent->type_list,
next) {
list_del(&ltype->next);
remove_mdev_supported_type(ltype);
}
return PTR_ERR(type);
}
list_add(&type->next, &parent->type_list);
}
return 0;
}
/* mdev sysfs functions */
void parent_remove_sysfs_files(struct mdev_parent *parent)
{
struct mdev_type *type, *tmp;
list_for_each_entry_safe(type, tmp, &parent->type_list, next) {
list_del(&type->next);
remove_mdev_supported_type(type);
}
int i;
for (i = 0; i < parent->nr_types; i++)
mdev_type_remove(parent->types[i]);
kset_unregister(parent->mdev_types_kset);
}
int parent_create_sysfs_files(struct mdev_parent *parent)
{
int ret;
int ret, i;
parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
NULL, &parent->dev->kobj);
if (!parent->mdev_types_kset)
return -ENOMEM;
INIT_LIST_HEAD(&parent->type_list);
ret = add_mdev_supported_type_groups(parent);
if (ret)
goto create_err;
for (i = 0; i < parent->nr_types; i++) {
ret = mdev_type_add(parent, parent->types[i]);
if (ret)
goto out_err;
}
return 0;
create_err:
kset_unregister(parent->mdev_types_kset);
return ret;
out_err:
while (--i >= 0)
mdev_type_remove(parent->types[i]);
return 0;
}
static ssize_t remove_store(struct device *dev, struct device_attribute *attr,

26
include/linux/mdev.h
View File

@ -23,14 +23,27 @@ struct mdev_device {
bool active;
};
struct mdev_type {
/* set by the driver before calling mdev_register parent: */
const char *sysfs_name;
/* set by the core, can be used drivers */
struct mdev_parent *parent;
/* internal only */
struct kobject kobj;
struct kobject *devices_kobj;
};
/* embedded into the struct device that the mdev devices hang off */
struct mdev_parent {
struct device *dev;
struct mdev_driver *mdev_driver;
struct kset *mdev_types_kset;
struct list_head type_list;
/* Synchronize device creation/removal with parent unregistration */
struct rw_semaphore unreg_sem;
struct mdev_type **types;
unsigned int nr_types;
};
static inline struct mdev_device *to_mdev_device(struct device *dev)
@ -38,8 +51,6 @@ static inline struct mdev_device *to_mdev_device(struct device *dev)
return container_of(dev, struct mdev_device, dev);
}
unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
unsigned int mtype_get_type_group_id(struct mdev_type *mtype);
struct device *mtype_get_parent_dev(struct mdev_type *mtype);
/* interface for exporting mdev supported type attributes */
@ -66,22 +77,21 @@ struct mdev_type_attribute mdev_type_attr_##_name = \
* struct mdev_driver - Mediated device driver
* @probe: called when new device created
* @remove: called when device removed
* @supported_type_groups: Attributes to define supported types. It is mandatory
* to provide supported types.
* @types_attrs: attributes to the type kobjects.
* @driver: device driver structure
*
**/
struct mdev_driver {
int (*probe)(struct mdev_device *dev);
void (*remove)(struct mdev_device *dev);
struct attribute_group **supported_type_groups;
const struct attribute * const *types_attrs;
struct device_driver driver;
};
extern struct bus_type mdev_bus_type;
int mdev_register_parent(struct mdev_parent *parent, struct device *dev,
struct mdev_driver *mdev_driver);
struct mdev_driver *mdev_driver, struct mdev_type **types,
unsigned int nr_types);
void mdev_unregister_parent(struct mdev_parent *parent);
int mdev_register_driver(struct mdev_driver *drv);

57
samples/vfio-mdev/mbochs.c
View File

@ -99,23 +99,27 @@ MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
#define MBOCHS_TYPE_2 "medium"
#define MBOCHS_TYPE_3 "large"
static const struct mbochs_type {
static struct mbochs_type {
struct mdev_type type;
const char *name;
u32 mbytes;
u32 max_x;
u32 max_y;
} mbochs_types[] = {
{
.type.sysfs_name = MBOCHS_TYPE_1,
.name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
.mbytes = 4,
.max_x = 800,
.max_y = 600,
}, {
.type.sysfs_name = MBOCHS_TYPE_2,
.name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
.mbytes = 16,
.max_x = 1920,
.max_y = 1440,
}, {
.type.sysfs_name = MBOCHS_TYPE_3,
.name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
.mbytes = 64,
.max_x = 0,
@ -123,6 +127,11 @@ static const struct mbochs_type {
},
};
static struct mdev_type *mbochs_mdev_types[] = {
&mbochs_types[0].type,
&mbochs_types[1].type,
&mbochs_types[2].type,
};
static dev_t mbochs_devt;
static struct class *mbochs_class;
@ -510,8 +519,8 @@ static int mbochs_init_dev(struct vfio_device *vdev)
struct mdev_state *mdev_state =
container_of(vdev, struct mdev_state, vdev);
struct mdev_device *mdev = to_mdev_device(vdev->dev);
const struct mbochs_type *type =
&mbochs_types[mdev_get_type_group_id(mdev)];
struct mbochs_type *type =
container_of(mdev->type, struct mbochs_type, type);
int avail_mbytes = atomic_read(&mbochs_avail_mbytes);
int ret = -ENOMEM;
@ -1345,8 +1354,8 @@ static const struct attribute_group *mdev_dev_groups[] = {
static ssize_t name_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
const struct mbochs_type *type =
&mbochs_types[mtype_get_type_group_id(mtype)];
struct mbochs_type *type =
container_of(mtype, struct mbochs_type, type);
return sprintf(buf, "%s\n", type->name);
}
@ -1355,8 +1364,8 @@ static MDEV_TYPE_ATTR_RO(name);
static ssize_t description_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
const struct mbochs_type *type =
&mbochs_types[mtype_get_type_group_id(mtype)];
struct mbochs_type *type =
container_of(mtype, struct mbochs_type, type);
return sprintf(buf, "virtual display, %d MB video memory\n",
type ? type->mbytes : 0);
@ -1367,8 +1376,8 @@ static ssize_t available_instances_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr,
char *buf)
{
const struct mbochs_type *type =
&mbochs_types[mtype_get_type_group_id(mtype)];
struct mbochs_type *type =
container_of(mtype, struct mbochs_type, type);
int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes;
return sprintf(buf, "%d\n", count);
@ -1382,7 +1391,7 @@ static ssize_t device_api_show(struct mdev_type *mtype,
}
static MDEV_TYPE_ATTR_RO(device_api);
static struct attribute *mdev_types_attrs[] = {
static const struct attribute *mdev_types_attrs[] = {
&mdev_type_attr_name.attr,
&mdev_type_attr_description.attr,
&mdev_type_attr_device_api.attr,
@ -1390,28 +1399,6 @@ static struct attribute *mdev_types_attrs[] = {
NULL,
};
static struct attribute_group mdev_type_group1 = {
.name = MBOCHS_TYPE_1,
.attrs = mdev_types_attrs,
};
static struct attribute_group mdev_type_group2 = {
.name = MBOCHS_TYPE_2,
.attrs = mdev_types_attrs,
};
static struct attribute_group mdev_type_group3 = {
.name = MBOCHS_TYPE_3,
.attrs = mdev_types_attrs,
};
static struct attribute_group *mdev_type_groups[] = {
&mdev_type_group1,
&mdev_type_group2,
&mdev_type_group3,
NULL,
};
static const struct vfio_device_ops mbochs_dev_ops = {
.close_device = mbochs_close_device,
.init = mbochs_init_dev,
@ -1431,7 +1418,7 @@ static struct mdev_driver mbochs_driver = {
},
.probe = mbochs_probe,
.remove = mbochs_remove,
.supported_type_groups = mdev_type_groups,
.types_attrs = mdev_types_attrs,
};
static const struct file_operations vd_fops = {
@ -1476,7 +1463,9 @@ static int __init mbochs_dev_init(void)
if (ret)
goto err_class;
ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver);
ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver,
mbochs_mdev_types,
ARRAY_SIZE(mbochs_mdev_types));
if (ret)
goto err_device;

50
samples/vfio-mdev/mdpy.c
View File

@ -51,7 +51,8 @@ MODULE_PARM_DESC(count, "number of " MDPY_NAME " devices");
#define MDPY_TYPE_2 "xga"
#define MDPY_TYPE_3 "hd"
static const struct mdpy_type {
static struct mdpy_type {
struct mdev_type type;
const char *name;
u32 format;
u32 bytepp;
@ -59,18 +60,21 @@ static const struct mdpy_type {
u32 height;
} mdpy_types[] = {
{
.type.sysfs_name = MDPY_TYPE_1,
.name = MDPY_CLASS_NAME "-" MDPY_TYPE_1,
.format = DRM_FORMAT_XRGB8888,
.bytepp = 4,
.width = 640,
.height = 480,
}, {
.type.sysfs_name = MDPY_TYPE_2,
.name = MDPY_CLASS_NAME "-" MDPY_TYPE_2,
.format = DRM_FORMAT_XRGB8888,
.bytepp = 4,
.width = 1024,
.height = 768,
}, {
.type.sysfs_name = MDPY_TYPE_3,
.name = MDPY_CLASS_NAME "-" MDPY_TYPE_3,
.format = DRM_FORMAT_XRGB8888,
.bytepp = 4,
@ -79,6 +83,12 @@ static const struct mdpy_type {
},
};
static struct mdev_type *mdpy_mdev_types[] = {
&mdpy_types[0].type,
&mdpy_types[1].type,
&mdpy_types[2].type,
};
static dev_t mdpy_devt;
static struct class *mdpy_class;
static struct cdev mdpy_cdev;
@ -222,7 +232,7 @@ static int mdpy_init_dev(struct vfio_device *vdev)
container_of(vdev, struct mdev_state, vdev);
struct mdev_device *mdev = to_mdev_device(vdev->dev);
const struct mdpy_type *type =
&mdpy_types[mdev_get_type_group_id(mdev)];
container_of(mdev->type, struct mdpy_type, type);
u32 fbsize;
int ret = -ENOMEM;
@ -655,8 +665,7 @@ static const struct attribute_group *mdev_dev_groups[] = {
static ssize_t name_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
const struct mdpy_type *type =
&mdpy_types[mtype_get_type_group_id(mtype)];
struct mdpy_type *type = container_of(mtype, struct mdpy_type, type);
return sprintf(buf, "%s\n", type->name);
}
@ -665,8 +674,7 @@ static MDEV_TYPE_ATTR_RO(name);
static ssize_t description_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
const struct mdpy_type *type =
&mdpy_types[mtype_get_type_group_id(mtype)];
struct mdpy_type *type = container_of(mtype, struct mdpy_type, type);
return sprintf(buf, "virtual display, %dx%d framebuffer\n",
type->width, type->height);
@ -688,7 +696,7 @@ static ssize_t device_api_show(struct mdev_type *mtype,
}
static MDEV_TYPE_ATTR_RO(device_api);
static struct attribute *mdev_types_attrs[] = {
static const struct attribute *mdev_types_attrs[] = {
&mdev_type_attr_name.attr,
&mdev_type_attr_description.attr,
&mdev_type_attr_device_api.attr,
@ -696,28 +704,6 @@ static struct attribute *mdev_types_attrs[] = {
NULL,
};
static struct attribute_group mdev_type_group1 = {
.name = MDPY_TYPE_1,
.attrs = mdev_types_attrs,
};
static struct attribute_group mdev_type_group2 = {
.name = MDPY_TYPE_2,
.attrs = mdev_types_attrs,
};
static struct attribute_group mdev_type_group3 = {
.name = MDPY_TYPE_3,
.attrs = mdev_types_attrs,
};
static struct attribute_group *mdev_type_groups[] = {
&mdev_type_group1,
&mdev_type_group2,
&mdev_type_group3,
NULL,
};
static const struct vfio_device_ops mdpy_dev_ops = {
.init = mdpy_init_dev,
.release = mdpy_release_dev,
@ -736,7 +722,7 @@ static struct mdev_driver mdpy_driver = {
},
.probe = mdpy_probe,
.remove = mdpy_remove,
.supported_type_groups = mdev_type_groups,
.types_attrs = mdev_types_attrs,
};
static const struct file_operations vd_fops = {
@ -779,7 +765,9 @@ static int __init mdpy_dev_init(void)
if (ret)
goto err_class;
ret = mdev_register_parent(&mdpy_parent, &mdpy_dev, &mdpy_driver);
ret = mdev_register_parent(&mdpy_parent, &mdpy_dev, &mdpy_driver,
mdpy_mdev_types,
ARRAY_SIZE(mdpy_mdev_types));
if (ret)
goto err_device;

60
samples/vfio-mdev/mtty.c
View File

@ -143,6 +143,20 @@ struct mdev_state {
int nr_ports;
};
static struct mtty_type {
struct mdev_type type;
int nr_ports;
const char *name;
} mtty_types[2] = {
{ .nr_ports = 1, .type.sysfs_name = "1", .name = "Single port serial" },
{ .nr_ports = 2, .type.sysfs_name = "2", .name = "Dual port serial" },
};
static struct mdev_type *mtty_mdev_types[] = {
&mtty_types[0].type,
&mtty_types[1].type,
};
static atomic_t mdev_avail_ports = ATOMIC_INIT(MAX_MTTYS);
static const struct file_operations vd_fops = {
@ -707,17 +721,19 @@ static int mtty_init_dev(struct vfio_device *vdev)
struct mdev_state *mdev_state =
container_of(vdev, struct mdev_state, vdev);
struct mdev_device *mdev = to_mdev_device(vdev->dev);
int nr_ports = mdev_get_type_group_id(mdev) + 1;
struct mtty_type *type =
container_of(mdev->type, struct mtty_type, type);
int avail_ports = atomic_read(&mdev_avail_ports);
int ret;
do {
if (avail_ports < nr_ports)
if (avail_ports < type->nr_ports)
return -ENOSPC;
} while (!atomic_try_cmpxchg(&mdev_avail_ports,
&avail_ports, avail_ports - nr_ports));
&avail_ports,
avail_ports - type->nr_ports));
mdev_state->nr_ports = nr_ports;
mdev_state->nr_ports = type->nr_ports;
mdev_state->irq_index = -1;
mdev_state->s[0].max_fifo_size = MAX_FIFO_SIZE;
mdev_state->s[1].max_fifo_size = MAX_FIFO_SIZE;
@ -735,7 +751,7 @@ static int mtty_init_dev(struct vfio_device *vdev)
return 0;
err_nr_ports:
atomic_add(nr_ports, &mdev_avail_ports);
atomic_add(type->nr_ports, &mdev_avail_ports);
return ret;
}
@ -1242,11 +1258,9 @@ static const struct attribute_group *mdev_dev_groups[] = {
static ssize_t name_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr, char *buf)
{
static const char *name_str[2] = { "Single port serial",
"Dual port serial" };
struct mtty_type *type = container_of(mtype, struct mtty_type, type);
return sysfs_emit(buf, "%s\n",
name_str[mtype_get_type_group_id(mtype)]);
return sysfs_emit(buf, "%s\n", type->name);
}
static MDEV_TYPE_ATTR_RO(name);
@ -1255,9 +1269,10 @@ static ssize_t available_instances_show(struct mdev_type *mtype,
struct mdev_type_attribute *attr,
char *buf)
{
unsigned int ports = mtype_get_type_group_id(mtype) + 1;
struct mtty_type *type = container_of(mtype, struct mtty_type, type);
return sprintf(buf, "%d\n", atomic_read(&mdev_avail_ports) / ports);
return sprintf(buf, "%d\n", atomic_read(&mdev_avail_ports) /
type->nr_ports);
}
static MDEV_TYPE_ATTR_RO(available_instances);
@ -1270,29 +1285,13 @@ static ssize_t device_api_show(struct mdev_type *mtype,
static MDEV_TYPE_ATTR_RO(device_api);
static struct attribute *mdev_types_attrs[] = {
static const struct attribute *mdev_types_attrs[] = {
&mdev_type_attr_name.attr,
&mdev_type_attr_device_api.attr,
&mdev_type_attr_available_instances.attr,
NULL,
};
static struct attribute_group mdev_type_group1 = {
.name = "1",
.attrs = mdev_types_attrs,
};
static struct attribute_group mdev_type_group2 = {
.name = "2",
.attrs = mdev_types_attrs,
};
static struct attribute_group *mdev_type_groups[] = {
&mdev_type_group1,
&mdev_type_group2,
NULL,
};
static const struct vfio_device_ops mtty_dev_ops = {
.name = "vfio-mtty",
.init = mtty_init_dev,
@ -1311,7 +1310,7 @@ static struct mdev_driver mtty_driver = {
},
.probe = mtty_probe,
.remove = mtty_remove,
.supported_type_groups = mdev_type_groups,
.types_attrs = mdev_types_attrs,
};
static void mtty_device_release(struct device *dev)
@ -1363,7 +1362,8 @@ static int __init mtty_dev_init(void)
goto err_class;
ret = mdev_register_parent(&mtty_dev.parent, &mtty_dev.dev,
&mtty_driver);
&mtty_driver, mtty_mdev_types,
ARRAY_SIZE(mtty_mdev_types));
if (ret)
goto err_device;
return 0;