include/misc/cxl-base.h

   1 /*
   2  * Copyright 2014 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #ifndef _MISC_CXL_BASE_H
  11 #define _MISC_CXL_BASE_H
  12
  13 #ifdef CONFIG_CXL_BASE
  14
  15 #define CXL_IRQ_RANGES 4
  16
  17 struct cxl_irq_ranges {
  18         irq_hw_number_t offset[CXL_IRQ_RANGES];
  19         irq_hw_number_t range[CXL_IRQ_RANGES];
  20 };
  21
  22 extern atomic_t cxl_use_count;
  23
  24 static inline bool cxl_ctx_in_use(void)
  25 {
  26        return (atomic_read(&cxl_use_count) != 0);
  27 }
  28
  29 static inline void cxl_ctx_get(void)
  30 {
  31        atomic_inc(&cxl_use_count);
  32 }
  33
  34 static inline void cxl_ctx_put(void)
  35 {
  36        atomic_dec(&cxl_use_count);
  37 }
  38
  39 void cxl_slbia(struct mm_struct *mm);
  40
  41 #else /* CONFIG_CXL_BASE */
  42
  43 static inline bool cxl_ctx_in_use(void) { return false; }
  44 static inline void cxl_slbia(struct mm_struct *mm) {}
  45
  46 #endif /* CONFIG_CXL_BASE */
  47
  48 #endif