drivers/misc/vmw_vmci/vmci_handle_array.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * VMware VMCI Driver
   4  *
   5  * Copyright (C) 2012 VMware, Inc. All rights reserved.
   6  */
   7
   8 #ifndef _VMCI_HANDLE_ARRAY_H_
   9 #define _VMCI_HANDLE_ARRAY_H_
  10
  11 #include <linux/vmw_vmci_defs.h>
  12 #include <linux/limits.h>
  13 #include <linux/types.h>
  14
  15 struct vmci_handle_arr {
  16         u32 capacity;
  17         u32 max_capacity;
  18         u32 size;
  19         u32 pad;
  20         struct vmci_handle entries[];
  21 };
  22
  23 #define VMCI_HANDLE_ARRAY_HEADER_SIZE                           \
  24         offsetof(struct vmci_handle_arr, entries)
  25 /* Select a default capacity that results in a 64 byte sized array */
  26 #define VMCI_HANDLE_ARRAY_DEFAULT_CAPACITY                      6
  27 /* Make sure that the max array size can be expressed by a u32 */
  28 #define VMCI_HANDLE_ARRAY_MAX_CAPACITY                          \
  29         ((U32_MAX - VMCI_HANDLE_ARRAY_HEADER_SIZE - 1) /        \
  30         sizeof(struct vmci_handle))
  31
  32 struct vmci_handle_arr *vmci_handle_arr_create(u32 capacity, u32 max_capacity);
  33 void vmci_handle_arr_destroy(struct vmci_handle_arr *array);
  34 int vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
  35                                  struct vmci_handle handle);
  36 struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,
  37                                                 struct vmci_handle
  38                                                 entry_handle);
  39 struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array);
  40 struct vmci_handle
  41 vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, u32 index);
  42 bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
  43                                struct vmci_handle entry_handle);
  44 struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array);
  45
  46 static inline u32 vmci_handle_arr_get_size(
  47         const struct vmci_handle_arr *array)
  48 {
  49         return array->size;
  50 }
  51
  52
  53 #endif /* _VMCI_HANDLE_ARRAY_H_ */