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 #define to_ocxl_function(d) container_of(d, struct ocxl_fn, dev)
  15 #define to_ocxl_afu(d) container_of(d, struct ocxl_afu, dev)
  16
  17 extern struct pci_driver ocxl_pci_driver;
  18
  19
  20 struct ocxl_fn {
  21         struct device dev;
  22         int bar_used[3];
  23         struct ocxl_fn_config config;
  24         struct list_head afu_list;
  25         int pasid_base;
  26         int actag_base;
  27         int actag_enabled;
  28         int actag_supported;
  29         struct list_head pasid_list;
  30         struct list_head actag_list;
  31         void *link;
  32 };
  33
  34 struct ocxl_afu {
  35         struct ocxl_fn *fn;
  36         struct list_head list;
  37         struct device dev;
  38         struct cdev cdev;
  39         struct ocxl_afu_config config;
  40         int pasid_base;
  41         int pasid_count; /* opened contexts */
  42         int pasid_max; /* maximum number of contexts */
  43         int actag_base;
  44         int actag_enabled;
  45         struct mutex contexts_lock;
  46         struct idr contexts_idr;
  47         struct mutex afu_control_lock;
  48         u64 global_mmio_start;
  49         u64 irq_base_offset;
  50         void __iomem *global_mmio_ptr;
  51         u64 pp_mmio_start;
  52         struct bin_attribute attr_global_mmio;
  53 };
  54
  55 enum ocxl_context_status {
  56         CLOSED,
  57         OPENED,
  58         ATTACHED,
  59 };
  60
  61 // Contains metadata about a translation fault
  62 struct ocxl_xsl_error {
  63         u64 addr; // The address that triggered the fault
  64         u64 dsisr; // the value of the dsisr register
  65         u64 count; // The number of times this fault has been triggered
  66 };
  67
  68 struct ocxl_context {
  69         struct ocxl_afu *afu;
  70         int pasid;
  71         struct mutex status_mutex;
  72         enum ocxl_context_status status;
  73         struct address_space *mapping;
  74         struct mutex mapping_lock;
  75         wait_queue_head_t events_wq;
  76         struct mutex xsl_error_lock;
  77         struct ocxl_xsl_error xsl_error;
  78         struct mutex irq_lock;
  79         struct idr irq_idr;
  80 };
  81
  82 struct ocxl_process_element {
  83         __be64 config_state;
  84         __be32 reserved1[11];
  85         __be32 lpid;
  86         __be32 tid;
  87         __be32 pid;
  88         __be32 reserved2[10];
  89         __be64 amr;
  90         __be32 reserved3[3];
  91         __be32 software_state;
  92 };
  93
  94
  95 extern struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu);
  96 extern void ocxl_afu_put(struct ocxl_afu *afu);
  97
  98 extern int ocxl_create_cdev(struct ocxl_afu *afu);
  99 extern void ocxl_destroy_cdev(struct ocxl_afu *afu);
 100 extern int ocxl_register_afu(struct ocxl_afu *afu);
 101 extern void ocxl_unregister_afu(struct ocxl_afu *afu);
 102
 103 extern int ocxl_file_init(void);
 104 extern void ocxl_file_exit(void);
 105
 106 extern int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
 107 extern void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
 108 extern int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
 109 extern void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
 110
 111 extern struct ocxl_context *ocxl_context_alloc(void);
 112 extern int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,
 113                         struct address_space *mapping);
 114 extern int ocxl_context_attach(struct ocxl_context *ctx, u64 amr);
 115 extern int ocxl_context_mmap(struct ocxl_context *ctx,
 116                         struct vm_area_struct *vma);
 117 extern int ocxl_context_detach(struct ocxl_context *ctx);
 118 extern void ocxl_context_detach_all(struct ocxl_afu *afu);
 119 extern void ocxl_context_free(struct ocxl_context *ctx);
 120
 121 extern int ocxl_sysfs_add_afu(struct ocxl_afu *afu);
 122 extern void ocxl_sysfs_remove_afu(struct ocxl_afu *afu);
 123
 124 extern int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset);
 125 extern int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset);
 126 extern void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
 127 extern int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset,
 128                         int eventfd);
 129 extern u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset);
 130
 131 #endif /* _OCXL_INTERNAL_H_ */