1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * CXL Flash Device Driver
4  *
5  * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
6  *	       Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
7  *
8  * Copyright (C) 2018 IBM Corporation
9  */
10 
11 #define OCXL_MAX_IRQS	4	/* Max interrupts per process */
12 
13 struct ocxlflash_irqs {
14 	int hwirq;
15 	u32 virq;
16 	void __iomem *vtrig;
17 };
18 
19 /* OCXL hardware AFU associated with the host */
20 struct ocxl_hw_afu {
21 	struct ocxlflash_context *ocxl_ctx; /* Host context */
22 	struct pci_dev *pdev;		/* PCI device */
23 	struct device *dev;		/* Generic device */
24 	bool perst_same_image;		/* Same image loaded on perst */
25 
26 	struct ocxl_fn_config fcfg;	/* DVSEC config of the function */
27 	struct ocxl_afu_config acfg;	/* AFU configuration data */
28 
29 	int fn_actag_base;		/* Function acTag base */
30 	int fn_actag_enabled;		/* Function acTag number enabled */
31 	int afu_actag_base;		/* AFU acTag base */
32 	int afu_actag_enabled;		/* AFU acTag number enabled */
33 
34 	phys_addr_t ppmmio_phys;	/* Per process MMIO space */
35 	phys_addr_t gmmio_phys;		/* Global AFU MMIO space */
36 	void __iomem *gmmio_virt;	/* Global MMIO map */
37 
38 	void *link_token;		/* Link token for the SPA */
39 	struct idr idr;			/* IDR to manage contexts */
40 	int max_pasid;			/* Maximum number of contexts */
41 	bool is_present;		/* Function has AFUs defined */
42 };
43 
44 enum ocxlflash_ctx_state {
45 	CLOSED,
46 	OPENED,
47 	STARTED
48 };
49 
50 struct ocxlflash_context {
51 	struct ocxl_hw_afu *hw_afu;	/* HW AFU back pointer */
52 	struct address_space *mapping;	/* Mapping for pseudo filesystem */
53 	bool master;			/* Whether this is a master context */
54 	int pe;				/* Process element */
55 
56 	phys_addr_t psn_phys;		/* Process mapping */
57 	u64 psn_size;			/* Process mapping size */
58 
59 	spinlock_t slock;		/* Protects irq/fault/event updates */
60 	wait_queue_head_t wq;		/* Wait queue for poll and interrupts */
61 	struct mutex state_mutex;	/* Mutex to update context state */
62 	enum ocxlflash_ctx_state state;	/* Context state */
63 
64 	struct ocxlflash_irqs *irqs;	/* Pointer to array of structures */
65 	int num_irqs;			/* Number of interrupts */
66 	bool pending_irq;		/* Pending interrupt on the context */
67 	ulong irq_bitmap;		/* Bits indicating pending irq num */
68 
69 	u64 fault_addr;			/* Address that triggered the fault */
70 	u64 fault_dsisr;		/* Value of dsisr register at fault */
71 	bool pending_fault;		/* Pending translation fault */
72 };
73