LXR linux/drivers/misc/ocxl/ocxl

   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
  14extern struct pci_driver ocxl_pci_driver;
  15
  16struct 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
  30struct 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
  37struct 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
  57enum ocxl_context_status {
  58        CLOSED,
  59        OPENED,
  60        ATTACHED,
  61};
  62
  63// Contains metadata about a translation fault
  64struct 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
  70struct 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
  85struct 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
  97int ocxl_create_cdev(struct ocxl_afu *afu);
  98void ocxl_destroy_cdev(struct ocxl_afu *afu);
  99int ocxl_file_register_afu(struct ocxl_afu *afu);
 100void ocxl_file_unregister_afu(struct ocxl_afu *afu);
 101
 102int ocxl_file_init(void);
 103void ocxl_file_exit(void);
 104
 105int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
 106void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
 107int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
 108void 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 */
 113int 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 */
 121int 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 */
 131int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);
 132
 133int ocxl_context_mmap(struct ocxl_context *ctx,
 134                        struct vm_area_struct *vma);
 135void ocxl_context_detach_all(struct ocxl_afu *afu);
 136
 137int ocxl_sysfs_register_afu(struct ocxl_file_info *info);
 138void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
 139
 140int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
 141u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
 142void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
 143
 144#endif /* _OCXL_INTERNAL_H_ */
 145