drivers/misc/ocxl/ocxl_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 // Copyright 2017 IBM Corp.
   3 #ifndef _OCXL_INTERNAL_H_
   4 #define _OCXL_INTERNAL_H_
   5
   6 #include <linux/pci.h>
   7 #include <linux/cdev.h>
   8 #include <linux/list.h>
   9 #include <misc/ocxl.h>
  10
  11 #define MAX_IRQ_PER_LINK        2000
  12 #define MAX_IRQ_PER_CONTEXT     MAX_IRQ_PER_LINK
  13
  14 extern struct pci_driver ocxl_pci_driver;
  15
  16 struct ocxl_fn {
  17         struct device dev;
  18         int bar_used[3];
  19         struct ocxl_fn_config config;
  20         struct list_head afu_list;
  21         int pasid_base;
  22         int actag_base;
  23         int actag_enabled;
  24         int actag_supported;
  25         struct list_head pasid_list;
  26         struct list_head actag_list;
  27         void *link;
  28 };
  29
  30 struct ocxl_file_info {
  31         struct ocxl_afu *afu;
  32         struct device dev;
  33         struct cdev cdev;
  34         struct bin_attribute attr_global_mmio;
  35 };
  36
  37 struct ocxl_afu {
  38         struct kref kref;
  39         struct ocxl_fn *fn;
  40         struct list_head list;
  41         struct ocxl_afu_config config;
  42         int pasid_base;
  43         int pasid_count; /* opened contexts */
  44         int pasid_max; /* maximum number of contexts */
  45         int actag_base;
  46         int actag_enabled;
  47         struct mutex contexts_lock;
  48         struct idr contexts_idr;
  49         struct mutex afu_control_lock;
  50         u64 global_mmio_start;
  51         u64 irq_base_offset;
  52         void __iomem *global_mmio_ptr;
  53         u64 pp_mmio_start;
  54         void *private;
  55 };
  56
  57 enum ocxl_context_status {
  58         CLOSED,
  59         OPENED,
  60         ATTACHED,
  61 };
  62
  63 // Contains metadata about a translation fault
  64 struct ocxl_xsl_error {
  65         u64 addr; // The address that triggered the fault
  66         u64 dsisr; // the value of the dsisr register
  67         u64 count; // The number of times this fault has been triggered
  68 };
  69
  70 struct ocxl_context {
  71         struct ocxl_afu *afu;
  72         int pasid;
  73         struct mutex status_mutex;
  74         enum ocxl_context_status status;
  75         struct address_space *mapping;
  76         struct mutex mapping_lock;
  77         wait_queue_head_t events_wq;
  78         struct mutex xsl_error_lock;
  79         struct ocxl_xsl_error xsl_error;
  80         struct mutex irq_lock;
  81         struct idr irq_idr;
  82         u16 tidr; // Thread ID used for P9 wait implementation
  83 };
  84
  85 struct ocxl_process_element {
  86         __be64 config_state;
  87         __be32 reserved1[11];
  88         __be32 lpid;
  89         __be32 tid;
  90         __be32 pid;
  91         __be32 reserved2[10];
  92         __be64 amr;
  93         __be32 reserved3[3];
  94         __be32 software_state;
  95 };
  96
  97 int ocxl_create_cdev(struct ocxl_afu *afu);
  98 void ocxl_destroy_cdev(struct ocxl_afu *afu);
  99 int ocxl_file_register_afu(struct ocxl_afu *afu);
 100 void ocxl_file_unregister_afu(struct ocxl_afu *afu);
 101
 102 int ocxl_file_init(void);
 103 void ocxl_file_exit(void);
 104
 105 int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
 106 void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
 107 int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
 108 void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
 109
 110 /*
 111  * Get the max PASID value that can be used by the function
 112  */
 113 int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count);
 114
 115 /*
 116  * Check if an AFU index is valid for the given function.
 117  *
 118  * AFU indexes can be sparse, so a driver should check all indexes up
 119  * to the maximum found in the function description
 120  */
 121 int ocxl_config_check_afu_index(struct pci_dev *dev,
 122                                 struct ocxl_fn_config *fn, int afu_idx);
 123
 124 /**
 125  * Update values within a Process Element
 126  *
 127  * link_handle: the link handle associated with the process element
 128  * pasid: the PASID for the AFU context
 129  * tid: the new thread id for the process element
 130  */
 131 int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);
 132
 133 int ocxl_context_mmap(struct ocxl_context *ctx,
 134                         struct vm_area_struct *vma);
 135 void ocxl_context_detach_all(struct ocxl_afu *afu);
 136
 137 int ocxl_sysfs_register_afu(struct ocxl_file_info *info);
 138 void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
 139
 140 int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
 141 u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
 142 void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
 143
 144 #endif /* _OCXL_INTERNAL_H_ */