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 #include <misc/cxl.h>
  14
  15 #ifdef CONFIG_CXL_BASE
  16
  17 #define CXL_IRQ_RANGES 4
  18
  19 struct cxl_irq_ranges {
  20         irq_hw_number_t offset[CXL_IRQ_RANGES];
  21         irq_hw_number_t range[CXL_IRQ_RANGES];
  22 };
  23
  24 extern atomic_t cxl_use_count;
  25
  26 static inline bool cxl_ctx_in_use(void)
  27 {
  28        return (atomic_read(&cxl_use_count) != 0);
  29 }
  30
  31 static inline void cxl_ctx_get(void)
  32 {
  33        atomic_inc(&cxl_use_count);
  34 }
  35
  36 static inline void cxl_ctx_put(void)
  37 {
  38        atomic_dec(&cxl_use_count);
  39 }
  40
  41 struct cxl_afu *cxl_afu_get(struct cxl_afu *afu);
  42 void cxl_afu_put(struct cxl_afu *afu);
  43 void cxl_slbia(struct mm_struct *mm);
  44 bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu);
  45 void cxl_pci_disable_device(struct pci_dev *dev);
  46 int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type);
  47 void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev);
  48
  49 #else /* CONFIG_CXL_BASE */
  50
  51 static inline bool cxl_ctx_in_use(void) { return false; }
  52 static inline struct cxl_afu *cxl_afu_get(struct cxl_afu *afu) { return NULL; }
  53 static inline void cxl_afu_put(struct cxl_afu *afu) {}
  54 static inline void cxl_slbia(struct mm_struct *mm) {}
  55 static inline bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu) { return false; }
  56 static inline void cxl_pci_disable_device(struct pci_dev *dev) {}
  57 static inline int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) { return -ENODEV; }
  58 static inline void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev) {}
  59
  60 #endif /* CONFIG_CXL_BASE */
  61
  62 #endif