scsi: cxlflash: Staging to support future accelerators

As staging to support future accelerator transports, add a shim layer
such that the underlying services the cxlflash driver requires can be
conditional upon the accelerator infrastructure.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/scsi/cxlflash/backend.h b/drivers/scsi/cxlflash/backend.h
new file mode 100644
index 000000000000..339e42b03c49
--- /dev/null
+++ b/drivers/scsi/cxlflash/backend.h
@@ -0,0 +1,41 @@
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ *             Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2018 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+extern const struct cxlflash_backend_ops cxlflash_cxl_ops;
+
+struct cxlflash_backend_ops {
+	struct module *module;
+	void __iomem * (*psa_map)(void *);
+	void (*psa_unmap)(void __iomem *);
+	int (*process_element)(void *);
+	int (*map_afu_irq)(void *, int, irq_handler_t, void *, char *);
+	void (*unmap_afu_irq)(void *, int, void *);
+	int (*start_context)(void *);
+	int (*stop_context)(void *);
+	int (*afu_reset)(void *);
+	void (*set_master)(void *);
+	void * (*get_context)(struct pci_dev *, void *);
+	void * (*dev_context_init)(struct pci_dev *, void *);
+	int (*release_context)(void *);
+	void (*perst_reloads_same_image)(void *, bool);
+	ssize_t (*read_adapter_vpd)(struct pci_dev *, void *, size_t);
+	int (*allocate_afu_irqs)(void *, int);
+	void (*free_afu_irqs)(void *);
+	void * (*create_afu)(struct pci_dev *);
+	struct file * (*get_fd)(void *, struct file_operations *, int *);
+	void * (*fops_get_context)(struct file *);
+	int (*start_work)(void *, u64);
+	int (*fd_mmap)(struct file *, struct vm_area_struct *);
+	int (*fd_release)(struct inode *, struct file *);
+};