Re: [PATCH 2/6] mdev: introduce device specific ops

kbuild test robot
2019-09-23T15:21:21Z

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Hi Jason,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3 next-20190920]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/Jason-Wang/mdev-based-hardware-virtio-offloading-support/20190923-210738
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.4.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.4.0 make.cross ARCH=ia64

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

In file included from include/linux/vfio_mdev.h:10:0,
from <command-line>:0:
>> include/linux/mdev.h:25:34: warning: 'struct device' declared inside parameter list will not be visible outside of this definition or declaration
int mdev_set_iommu_device(struct device *dev, struct device *iommu_device);
^~~~~~
>> include/linux/mdev.h:62:27: warning: 'struct kobject' declared inside parameter list will not be visible outside of this definition or declaration
int (*create)(struct kobject *kobj, struct mdev_device *mdev);
^~~~~~~
>> include/linux/mdev.h:69:19: error: field 'attr' has incomplete type
struct attribute attr;
^~~~
include/linux/mdev.h:70:25: warning: 'struct kobject' declared inside parameter list will not be visible outside of this definition or declaration
ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
^~~~~~~
include/linux/mdev.h:71:26: warning: 'struct kobject' declared inside parameter list will not be visible outside of this definition or declaration
ssize_t (*store)(struct kobject *kobj, struct device *dev,
^~~~~~~
>> include/linux/mdev.h:98:23: error: field 'driver' has incomplete type
struct device_driver driver;
^~~~~~
>> include/linux/mdev.h:106:7: error: unknown type name 'guid_t'
const guid_t *mdev_uuid(struct mdev_device *mdev);
^~~~~~
In file included from <command-line>:0:0:
>> include/linux/vfio_mdev.h:50:47: warning: 'struct vm_area_struct' declared inside parameter list will not be visible outside of this definition or declaration
int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
^~~~~~~~~~~~~~

vim +/attr +69 include/linux/mdev.h

7b96953bc640b6 Kirti Wankhede 2016-11-17 14
8ac13175cbe985 Lu Baolu 2019-04-12 15 /*
8ac13175cbe985 Lu Baolu 2019-04-12 16 * Called by the parent device driver to set the device which represents
8ac13175cbe985 Lu Baolu 2019-04-12 17 * this mdev in iommu protection scope. By default, the iommu device is
8ac13175cbe985 Lu Baolu 2019-04-12 18 * NULL, that indicates using vendor defined isolation.
8ac13175cbe985 Lu Baolu 2019-04-12 19 *
8ac13175cbe985 Lu Baolu 2019-04-12 20 * @dev: the mediated device that iommu will isolate.
8ac13175cbe985 Lu Baolu 2019-04-12 21 * @iommu_device: a pci device which represents the iommu for @dev.
8ac13175cbe985 Lu Baolu 2019-04-12 22 *
8ac13175cbe985 Lu Baolu 2019-04-12 23 * Return 0 for success, otherwise negative error value.
8ac13175cbe985 Lu Baolu 2019-04-12 24 */
8ac13175cbe985 Lu Baolu 2019-04-12 @25 int mdev_set_iommu_device(struct device *dev, struct device *iommu_device);
8ac13175cbe985 Lu Baolu 2019-04-12 26
8ac13175cbe985 Lu Baolu 2019-04-12 27 struct device *mdev_get_iommu_device(struct device *dev);
8ac13175cbe985 Lu Baolu 2019-04-12 28
7b96953bc640b6 Kirti Wankhede 2016-11-17 29 /**
42930553a7c11f Alex Williamson 2016-12-30 30 * struct mdev_parent_ops - Structure to be registered for each parent device to
7b96953bc640b6 Kirti Wankhede 2016-11-17 31 * register the device to mdev module.
7b96953bc640b6 Kirti Wankhede 2016-11-17 32 *
7b96953bc640b6 Kirti Wankhede 2016-11-17 33 * @owner: The module owner.
7b96953bc640b6 Kirti Wankhede 2016-11-17 34 * @dev_attr_groups: Attributes of the parent device.
7b96953bc640b6 Kirti Wankhede 2016-11-17 35 * @mdev_attr_groups: Attributes of the mediated device.
7b96953bc640b6 Kirti Wankhede 2016-11-17 36 * @supported_type_groups: Attributes to define supported types. It is mandatory
7b96953bc640b6 Kirti Wankhede 2016-11-17 37 * to provide supported types.
7b96953bc640b6 Kirti Wankhede 2016-11-17 38 * @create: Called to allocate basic resources in parent device's
7b96953bc640b6 Kirti Wankhede 2016-11-17 39 * driver for a particular mediated device. It is
7b96953bc640b6 Kirti Wankhede 2016-11-17 40 * mandatory to provide create ops.
7b96953bc640b6 Kirti Wankhede 2016-11-17 41 * @kobj: kobject of type for which 'create' is called.
7b96953bc640b6 Kirti Wankhede 2016-11-17 42 * @mdev: mdev_device structure on of mediated device
7b96953bc640b6 Kirti Wankhede 2016-11-17 43 * that is being created
7b96953bc640b6 Kirti Wankhede 2016-11-17 44 * Returns integer: success (0) or error (< 0)
7b96953bc640b6 Kirti Wankhede 2016-11-17 45 * @remove: Called to free resources in parent device's driver for a
7b96953bc640b6 Kirti Wankhede 2016-11-17 46 * a mediated device. It is mandatory to provide 'remove'
7b96953bc640b6 Kirti Wankhede 2016-11-17 47 * ops.
7b96953bc640b6 Kirti Wankhede 2016-11-17 48 * @mdev: mdev_device device structure which is being
7b96953bc640b6 Kirti Wankhede 2016-11-17 49 * destroyed
7b96953bc640b6 Kirti Wankhede 2016-11-17 50 * Returns integer: success (0) or error (< 0)
0baad8a6f6fefa Jason Wang 2019-09-23 51 * @device_ops: Device specific emulation callback.
0baad8a6f6fefa Jason Wang 2019-09-23 52 *
7b96953bc640b6 Kirti Wankhede 2016-11-17 53 * Parent device that support mediated device should be registered with mdev
42930553a7c11f Alex Williamson 2016-12-30 54 * module with mdev_parent_ops structure.
7b96953bc640b6 Kirti Wankhede 2016-11-17 55 **/
42930553a7c11f Alex Williamson 2016-12-30 56 struct mdev_parent_ops {
7b96953bc640b6 Kirti Wankhede 2016-11-17 57 struct module *owner;
7b96953bc640b6 Kirti Wankhede 2016-11-17 58 const struct attribute_group **dev_attr_groups;
7b96953bc640b6 Kirti Wankhede 2016-11-17 59 const struct attribute_group **mdev_attr_groups;
7b96953bc640b6 Kirti Wankhede 2016-11-17 60 struct attribute_group **supported_type_groups;
7b96953bc640b6 Kirti Wankhede 2016-11-17 61
7b96953bc640b6 Kirti Wankhede 2016-11-17 @62 int (*create)(struct kobject *kobj, struct mdev_device *mdev);
7b96953bc640b6 Kirti Wankhede 2016-11-17 63 int (*remove)(struct mdev_device *mdev);
0baad8a6f6fefa Jason Wang 2019-09-23 64 const void *device_ops;
7b96953bc640b6 Kirti Wankhede 2016-11-17 65 };
7b96953bc640b6 Kirti Wankhede 2016-11-17 66
7b96953bc640b6 Kirti Wankhede 2016-11-17 67 /* interface for exporting mdev supported type attributes */
7b96953bc640b6 Kirti Wankhede 2016-11-17 68 struct mdev_type_attribute {
7b96953bc640b6 Kirti Wankhede 2016-11-17 @69 struct attribute attr;
7b96953bc640b6 Kirti Wankhede 2016-11-17 @70 ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
7b96953bc640b6 Kirti Wankhede 2016-11-17 71 ssize_t (*store)(struct kobject *kobj, struct device *dev,
7b96953bc640b6 Kirti Wankhede 2016-11-17 72 const char *buf, size_t count);
7b96953bc640b6 Kirti Wankhede 2016-11-17 73 };
7b96953bc640b6 Kirti Wankhede 2016-11-17 74
7b96953bc640b6 Kirti Wankhede 2016-11-17 75 #define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \
7b96953bc640b6 Kirti Wankhede 2016-11-17 76 struct mdev_type_attribute mdev_type_attr_##_name = \
7b96953bc640b6 Kirti Wankhede 2016-11-17 77 __ATTR(_name, _mode, _show, _store)
7b96953bc640b6 Kirti Wankhede 2016-11-17 78 #define MDEV_TYPE_ATTR_RW(_name) \
7b96953bc640b6 Kirti Wankhede 2016-11-17 79 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name)
7b96953bc640b6 Kirti Wankhede 2016-11-17 80 #define MDEV_TYPE_ATTR_RO(_name) \
7b96953bc640b6 Kirti Wankhede 2016-11-17 81 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name)
7b96953bc640b6 Kirti Wankhede 2016-11-17 82 #define MDEV_TYPE_ATTR_WO(_name) \
7b96953bc640b6 Kirti Wankhede 2016-11-17 83 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name)
7b96953bc640b6 Kirti Wankhede 2016-11-17 84
7b96953bc640b6 Kirti Wankhede 2016-11-17 85 /**
7b96953bc640b6 Kirti Wankhede 2016-11-17 86 * struct mdev_driver - Mediated device driver
7b96953bc640b6 Kirti Wankhede 2016-11-17 87 * @name: driver name
7b96953bc640b6 Kirti Wankhede 2016-11-17 88 * @probe: called when new device created
7b96953bc640b6 Kirti Wankhede 2016-11-17 89 * @remove: called when device removed
7b96953bc640b6 Kirti Wankhede 2016-11-17 90 * @driver: device driver structure
6294ee8e0b5153 Jason Wang 2019-09-23 91 * @id_table: the ids serviced by this driver.
7b96953bc640b6 Kirti Wankhede 2016-11-17 92 *
7b96953bc640b6 Kirti Wankhede 2016-11-17 93 **/
7b96953bc640b6 Kirti Wankhede 2016-11-17 94 struct mdev_driver {
7b96953bc640b6 Kirti Wankhede 2016-11-17 95 const char *name;
7b96953bc640b6 Kirti Wankhede 2016-11-17 96 int (*probe)(struct device *dev);
7b96953bc640b6 Kirti Wankhede 2016-11-17 97 void (*remove)(struct device *dev);
7b96953bc640b6 Kirti Wankhede 2016-11-17 @98 struct device_driver driver;
6294ee8e0b5153 Jason Wang 2019-09-23 99 const struct mdev_class_id *id_table;
7b96953bc640b6 Kirti Wankhede 2016-11-17 100 };
7b96953bc640b6 Kirti Wankhede 2016-11-17 101
7b96953bc640b6 Kirti Wankhede 2016-11-17 102 #define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
7b96953bc640b6 Kirti Wankhede 2016-11-17 103
50732af3b65691 Parav Pandit 2019-04-30 104 void *mdev_get_drvdata(struct mdev_device *mdev);
50732af3b65691 Parav Pandit 2019-04-30 105 void mdev_set_drvdata(struct mdev_device *mdev, void *data);
50732af3b65691 Parav Pandit 2019-04-30 @106 const guid_t *mdev_uuid(struct mdev_device *mdev);
7b96953bc640b6 Kirti Wankhede 2016-11-17 107

:::::: The code at line 69 was first introduced by commit
:::::: 7b96953bc640b6b25665fe17ffca4b668b371f14 vfio: Mediated device Core driver

:::::: TO: Kirti Wankhede <kwankhede@nvidia.com>
:::::: CC: Alex Williamson <alex.williamson@redhat.com>

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