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/* SPDX-License-Identifier: GPL-2.0+ */
// Copyright 2017 IBM Corp.
#include <linux/pci.h>
#include <linux/cdev.h>
#include <linux/list.h>
#include <misc/ocxl.h>
#define MAX_IRQ_PER_LINK 2000
extern struct pci_driver ocxl_pci_driver;
struct ocxl_fn {
struct device dev;
int bar_used[3];
struct ocxl_fn_config config;
struct list_head afu_list;
int pasid_base;
int actag_base;
int actag_enabled;
int actag_supported;
struct list_head pasid_list;
struct list_head actag_list;
void *link;
struct ocxl_file_info {
struct ocxl_afu *afu;
struct device dev;
struct cdev cdev;
struct bin_attribute attr_global_mmio;
struct ocxl_afu {
struct kref kref;
struct ocxl_fn *fn;
struct list_head list;
struct ocxl_afu_config config;
int pasid_base;
int pasid_count; /* opened contexts */
int pasid_max; /* maximum number of contexts */
int actag_base;
int actag_enabled;
struct mutex contexts_lock;
struct idr contexts_idr;
struct mutex afu_control_lock;
u64 global_mmio_start;
u64 irq_base_offset;
void __iomem *global_mmio_ptr;
u64 pp_mmio_start;
void *private;
enum ocxl_context_status {
// Contains metadata about a translation fault
struct ocxl_xsl_error {
u64 addr; // The address that triggered the fault
u64 dsisr; // the value of the dsisr register
u64 count; // The number of times this fault has been triggered
struct ocxl_context {
struct ocxl_afu *afu;
int pasid;
struct mutex status_mutex;
enum ocxl_context_status status;
struct address_space *mapping;
struct mutex mapping_lock;
wait_queue_head_t events_wq;
struct mutex xsl_error_lock;
struct ocxl_xsl_error xsl_error;
struct mutex irq_lock;
struct idr irq_idr;
u16 tidr; // Thread ID used for P9 wait implementation
struct ocxl_process_element {
__be64 config_state;
__be32 pasid;
__be16 bdf;
__be16 reserved1;
__be32 reserved2[9];
__be32 lpid;
__be32 tid;
__be32 pid;
__be32 reserved3[10];
__be64 amr;
__be32 reserved4[3];
__be32 software_state;
int ocxl_create_cdev(struct ocxl_afu *afu);
void ocxl_destroy_cdev(struct ocxl_afu *afu);
int ocxl_file_register_afu(struct ocxl_afu *afu);
void ocxl_file_unregister_afu(struct ocxl_afu *afu);
int ocxl_file_init(void);
void ocxl_file_exit(void);
int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
* Get the max PASID value that can be used by the function
int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count);
* Control whether the FPGA is reloaded on a link reset
int ocxl_config_get_reset_reload(struct pci_dev *dev, int *val);
int ocxl_config_set_reset_reload(struct pci_dev *dev, int val);
* Check if an AFU index is valid for the given function.
* AFU indexes can be sparse, so a driver should check all indexes up
* to the maximum found in the function description
int ocxl_config_check_afu_index(struct pci_dev *dev,
struct ocxl_fn_config *fn, int afu_idx);
* ocxl_link_update_pe() - Update values within a Process Element
* @link_handle: the link handle associated with the process element
* @pasid: the PASID for the AFU context
* @tid: the new thread id for the process element
* Returns 0 on success
int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);
int ocxl_context_mmap(struct ocxl_context *ctx,
struct vm_area_struct *vma);
void ocxl_context_detach_all(struct ocxl_afu *afu);
int ocxl_sysfs_register_afu(struct ocxl_file_info *info);
void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
#endif /* _OCXL_INTERNAL_H_ */