280b983ce2
Some of the functions done by the generic driver should also be needed by other opencapi drivers: attaching a context to an adapter, translation fault handling, AFU interrupt allocation... So to avoid code duplication, the driver provides a kernel API that other drivers can use, similar to calling a in-kernel library. It is still a bit theoretical, for lack of real hardware, and will likely need adjustements down the road. But we used the cxlflash driver as a guinea pig. Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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// Copyright 2017 IBM Corp.
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#ifndef _OCXL_INTERNAL_H_
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#define _OCXL_INTERNAL_H_
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#include <linux/pci.h>
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#include <linux/cdev.h>
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#include <linux/list.h>
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#include <misc/ocxl.h>
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#define MAX_IRQ_PER_LINK 2000
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#define MAX_IRQ_PER_CONTEXT MAX_IRQ_PER_LINK
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#define to_ocxl_function(d) container_of(d, struct ocxl_fn, dev)
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#define to_ocxl_afu(d) container_of(d, struct ocxl_afu, dev)
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extern struct pci_driver ocxl_pci_driver;
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struct ocxl_fn {
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struct device dev;
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int bar_used[3];
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struct ocxl_fn_config config;
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struct list_head afu_list;
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int pasid_base;
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int actag_base;
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int actag_enabled;
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int actag_supported;
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struct list_head pasid_list;
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struct list_head actag_list;
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void *link;
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};
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struct ocxl_afu {
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struct ocxl_fn *fn;
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struct list_head list;
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struct device dev;
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struct cdev cdev;
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struct ocxl_afu_config config;
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int pasid_base;
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int pasid_count; /* opened contexts */
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int pasid_max; /* maximum number of contexts */
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int actag_base;
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int actag_enabled;
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struct mutex contexts_lock;
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struct idr contexts_idr;
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struct mutex afu_control_lock;
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u64 global_mmio_start;
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u64 irq_base_offset;
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void __iomem *global_mmio_ptr;
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u64 pp_mmio_start;
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struct bin_attribute attr_global_mmio;
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};
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enum ocxl_context_status {
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CLOSED,
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OPENED,
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ATTACHED,
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};
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// Contains metadata about a translation fault
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struct ocxl_xsl_error {
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u64 addr; // The address that triggered the fault
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u64 dsisr; // the value of the dsisr register
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u64 count; // The number of times this fault has been triggered
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};
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struct ocxl_context {
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struct ocxl_afu *afu;
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int pasid;
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struct mutex status_mutex;
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enum ocxl_context_status status;
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struct address_space *mapping;
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struct mutex mapping_lock;
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wait_queue_head_t events_wq;
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struct mutex xsl_error_lock;
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struct ocxl_xsl_error xsl_error;
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struct mutex irq_lock;
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struct idr irq_idr;
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};
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struct ocxl_process_element {
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__be64 config_state;
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__be32 reserved1[11];
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__be32 lpid;
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__be32 tid;
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__be32 pid;
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__be32 reserved2[10];
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__be64 amr;
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__be32 reserved3[3];
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__be32 software_state;
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};
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extern struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu);
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extern void ocxl_afu_put(struct ocxl_afu *afu);
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extern int ocxl_create_cdev(struct ocxl_afu *afu);
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extern void ocxl_destroy_cdev(struct ocxl_afu *afu);
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extern int ocxl_register_afu(struct ocxl_afu *afu);
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extern void ocxl_unregister_afu(struct ocxl_afu *afu);
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extern int ocxl_file_init(void);
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extern void ocxl_file_exit(void);
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extern int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
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extern void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
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extern int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
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extern void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
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extern struct ocxl_context *ocxl_context_alloc(void);
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extern int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,
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struct address_space *mapping);
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extern int ocxl_context_attach(struct ocxl_context *ctx, u64 amr);
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extern int ocxl_context_mmap(struct ocxl_context *ctx,
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struct vm_area_struct *vma);
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extern int ocxl_context_detach(struct ocxl_context *ctx);
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extern void ocxl_context_detach_all(struct ocxl_afu *afu);
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extern void ocxl_context_free(struct ocxl_context *ctx);
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extern int ocxl_sysfs_add_afu(struct ocxl_afu *afu);
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extern void ocxl_sysfs_remove_afu(struct ocxl_afu *afu);
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extern int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset);
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extern int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset);
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extern void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
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extern int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset,
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int eventfd);
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extern u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset);
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#endif /* _OCXL_INTERNAL_H_ */
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