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_mm
  72  * @uacce_mm: the corresponding mm
  73  * @qfrs: pointer of qfr regions
  74  * @state: queue state machine
  75  */
  76 struct uacce_queue {
  77         struct uacce_device *uacce;
  78         void *priv;
  79         wait_queue_head_t wait;
  80         struct list_head list;
  81         struct uacce_mm *uacce_mm;
  82         struct uacce_qfile_region *qfrs[UACCE_MAX_REGION];
  83         enum uacce_q_state state;
  84 };
  85
  86 /**
  87  * struct uacce_device
  88  * @algs: supported algorithms
  89  * @api_ver: api version
  90  * @ops: pointer to the struct uacce_ops
  91  * @qf_pg_num: page numbers of the queue file regions
  92  * @parent: pointer to the parent device
  93  * @is_vf: whether virtual function
  94  * @flags: uacce attributes
  95  * @dev_id: id of the uacce device
  96  * @cdev: cdev of the uacce
  97  * @dev: dev of the uacce
  98  * @priv: private pointer of the uacce
  99  * @mm_list: list head of uacce_mm->list
 100  * @mm_lock: lock for mm_list
 101  * @inode: core vfs
 102  */
 103 struct uacce_device {
 104         const char *algs;
 105         const char *api_ver;
 106         const struct uacce_ops *ops;
 107         unsigned long qf_pg_num[UACCE_MAX_REGION];
 108         struct device *parent;
 109         bool is_vf;
 110         u32 flags;
 111         u32 dev_id;
 112         struct cdev *cdev;
 113         struct device dev;
 114         void *priv;
 115         struct list_head mm_list;
 116         struct mutex mm_lock;
 117         struct inode *inode;
 118 };
 119
 120 /**
 121  * struct uacce_mm - keep track of queues bound to a process
 122  * @list: index into uacce_device
 123  * @queues: list of queues
 124  * @mm: the mm struct
 125  * @lock: protects the list of queues
 126  * @pasid: pasid of the uacce_mm
 127  * @handle: iommu_sva handle return from iommu_sva_bind_device
 128  */
 129 struct uacce_mm {
 130         struct list_head list;
 131         struct list_head queues;
 132         struct mm_struct *mm;
 133         struct mutex lock;
 134         int pasid;
 135         struct iommu_sva *handle;
 136 };
 137
 138 #if IS_ENABLED(CONFIG_UACCE)
 139
 140 struct uacce_device *uacce_alloc(struct device *parent,
 141                                  struct uacce_interface *interface);
 142 int uacce_register(struct uacce_device *uacce);
 143 void uacce_remove(struct uacce_device *uacce);
 144
 145 #else /* CONFIG_UACCE */
 146
 147 static inline
 148 struct uacce_device *uacce_alloc(struct device *parent,
 149                                  struct uacce_interface *interface)
 150 {
 151         return ERR_PTR(-ENODEV);
 152 }
 153
 154 static inline int uacce_register(struct uacce_device *uacce)
 155 {
 156         return -EINVAL;
 157 }
 158
 159 static inline void uacce_remove(struct uacce_device *uacce) {}
 160
 161 #endif /* CONFIG_UACCE */
 162
 163 #endif /* _LINUX_UACCE_H */