include/linux/uacce.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _LINUX_UACCE_H
   3 #define _LINUX_UACCE_H
   4
   5 #include <linux/cdev.h>
   6 #include <uapi/misc/uacce/uacce.h>
   7
   8 #define UACCE_NAME              "uacce"
   9 #define UACCE_MAX_REGION        2
  10 #define UACCE_MAX_NAME_SIZE     64
  11
  12 struct uacce_queue;
  13 struct uacce_device;
  14
  15 /**
  16  * struct uacce_qfile_region - structure of queue file region
  17  * @type: type of the region
  18  */
  19 struct uacce_qfile_region {
  20         enum uacce_qfrt type;
  21 };
  22
  23 /**
  24  * struct uacce_ops - uacce device operations
  25  * @get_available_instances:  get available instances left of the device
  26  * @get_queue: get a queue from the device
  27  * @put_queue: free a queue to the device
  28  * @start_queue: make the queue start work after get_queue
  29  * @stop_queue: make the queue stop work before put_queue
  30  * @is_q_updated: check whether the task is finished
  31  * @mmap: mmap addresses of queue to user space
  32  * @ioctl: ioctl for user space users of the queue
  33  */
  34 struct uacce_ops {
  35         int (*get_available_instances)(struct uacce_device *uacce);
  36         int (*get_queue)(struct uacce_device *uacce, unsigned long arg,
  37                          struct uacce_queue *q);
  38         void (*put_queue)(struct uacce_queue *q);
  39         int (*start_queue)(struct uacce_queue *q);
  40         void (*stop_queue)(struct uacce_queue *q);
  41         int (*is_q_updated)(struct uacce_queue *q);
  42         int (*mmap)(struct uacce_queue *q, struct vm_area_struct *vma,
  43                     struct uacce_qfile_region *qfr);
  44         long (*ioctl)(struct uacce_queue *q, unsigned int cmd,
  45                       unsigned long arg);
  46 };
  47
  48 /**
  49  * struct uacce_interface - interface required for uacce_register()
  50  * @name: the uacce device name.  Will show up in sysfs
  51  * @flags: uacce device attributes
  52  * @ops: pointer to the struct uacce_ops
  53  */
  54 struct uacce_interface {
  55         char name[UACCE_MAX_NAME_SIZE];
  56         unsigned int flags;
  57         const struct uacce_ops *ops;
  58 };
  59
  60 enum uacce_q_state {
  61         UACCE_Q_ZOMBIE = 0,
  62         UACCE_Q_INIT,
  63         UACCE_Q_STARTED,
  64 };
  65
  66 /**
  67  * struct uacce_queue
  68  * @uacce: pointer to uacce
  69  * @priv: private pointer
  70  * @wait: wait queue head
  71  * @list: index into uacce queues list
  72  * @qfrs: pointer of qfr regions
  73  * @state: queue state machine
  74  * @pasid: pasid associated to the mm
  75  * @handle: iommu_sva handle returned by iommu_sva_bind_device()
  76  */
  77 struct uacce_queue {
  78         struct uacce_device *uacce;
  79         void *priv;
  80         wait_queue_head_t wait;
  81         struct list_head list;
  82         struct uacce_qfile_region *qfrs[UACCE_MAX_REGION];
  83         enum uacce_q_state state;
  84         int pasid;
  85         struct iommu_sva *handle;
  86 };
  87
  88 /**
  89  * struct uacce_device
  90  * @algs: supported algorithms
  91  * @api_ver: api version
  92  * @ops: pointer to the struct uacce_ops
  93  * @qf_pg_num: page numbers of the queue file regions
  94  * @parent: pointer to the parent device
  95  * @is_vf: whether virtual function
  96  * @flags: uacce attributes
  97  * @dev_id: id of the uacce device
  98  * @cdev: cdev of the uacce
  99  * @dev: dev of the uacce
 100  * @priv: private pointer of the uacce
 101  * @queues: list of queues
 102  * @queues_lock: lock for queues list
 103  * @inode: core vfs
 104  */
 105 struct uacce_device {
 106         const char *algs;
 107         const char *api_ver;
 108         const struct uacce_ops *ops;
 109         unsigned long qf_pg_num[UACCE_MAX_REGION];
 110         struct device *parent;
 111         bool is_vf;
 112         u32 flags;
 113         u32 dev_id;
 114         struct cdev *cdev;
 115         struct device dev;
 116         void *priv;
 117         struct list_head queues;
 118         struct mutex queues_lock;
 119         struct inode *inode;
 120 };
 121
 122 #if IS_ENABLED(CONFIG_UACCE)
 123
 124 struct uacce_device *uacce_alloc(struct device *parent,
 125                                  struct uacce_interface *interface);
 126 int uacce_register(struct uacce_device *uacce);
 127 void uacce_remove(struct uacce_device *uacce);
 128
 129 #else /* CONFIG_UACCE */
 130
 131 static inline
 132 struct uacce_device *uacce_alloc(struct device *parent,
 133                                  struct uacce_interface *interface)
 134 {
 135         return ERR_PTR(-ENODEV);
 136 }
 137
 138 static inline int uacce_register(struct uacce_device *uacce)
 139 {
 140         return -EINVAL;
 141 }
 142
 143 static inline void uacce_remove(struct uacce_device *uacce) {}
 144
 145 #endif /* CONFIG_UACCE */
 146
 147 #endif /* _LINUX_UACCE_H */