1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
2 /*
3  * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All rights reserved.
4  */
5 
6 #ifndef _EFA_COM_H_
7 #define _EFA_COM_H_
8 
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/semaphore.h>
13 #include <linux/sched.h>
14 
15 #include <rdma/ib_verbs.h>
16 
17 #include "efa_common_defs.h"
18 #include "efa_admin_defs.h"
19 #include "efa_admin_cmds_defs.h"
20 #include "efa_regs_defs.h"
21 
22 #define EFA_MAX_HANDLERS 256
23 
24 struct efa_com_admin_cq {
25 	struct efa_admin_acq_entry *entries;
26 	dma_addr_t dma_addr;
27 	spinlock_t lock; /* Protects ACQ */
28 
29 	u16 cc; /* consumer counter */
30 	u8 phase;
31 };
32 
33 struct efa_com_admin_sq {
34 	struct efa_admin_aq_entry *entries;
35 	dma_addr_t dma_addr;
36 	spinlock_t lock; /* Protects ASQ */
37 
38 	u32 __iomem *db_addr;
39 
40 	u16 cc; /* consumer counter */
41 	u16 pc; /* producer counter */
42 	u8 phase;
43 
44 };
45 
46 /* Don't use anything other than atomic64 */
47 struct efa_com_stats_admin {
48 	atomic64_t submitted_cmd;
49 	atomic64_t completed_cmd;
50 	atomic64_t no_completion;
51 };
52 
53 enum {
54 	EFA_AQ_STATE_RUNNING_BIT = 0,
55 	EFA_AQ_STATE_POLLING_BIT = 1,
56 };
57 
58 struct efa_com_admin_queue {
59 	void *dmadev;
60 	void *efa_dev;
61 	struct efa_comp_ctx *comp_ctx;
62 	u32 completion_timeout; /* usecs */
63 	u16 poll_interval; /* msecs */
64 	u16 depth;
65 	struct efa_com_admin_cq cq;
66 	struct efa_com_admin_sq sq;
67 	u16 msix_vector_idx;
68 
69 	unsigned long state;
70 
71 	/* Count the number of available admin commands */
72 	struct semaphore avail_cmds;
73 
74 	struct efa_com_stats_admin stats;
75 
76 	spinlock_t comp_ctx_lock; /* Protects completion context pool */
77 	u32 *comp_ctx_pool;
78 	u16 comp_ctx_pool_next;
79 };
80 
81 struct efa_aenq_handlers;
82 
83 struct efa_com_aenq {
84 	struct efa_admin_aenq_entry *entries;
85 	struct efa_aenq_handlers *aenq_handlers;
86 	dma_addr_t dma_addr;
87 	u32 cc; /* consumer counter */
88 	u16 msix_vector_idx;
89 	u16 depth;
90 	u8 phase;
91 };
92 
93 struct efa_com_mmio_read {
94 	struct efa_admin_mmio_req_read_less_resp *read_resp;
95 	dma_addr_t read_resp_dma_addr;
96 	u16 seq_num;
97 	u16 mmio_read_timeout; /* usecs */
98 	/* serializes mmio reads */
99 	spinlock_t lock;
100 };
101 
102 struct efa_com_dev {
103 	struct efa_com_admin_queue aq;
104 	struct efa_com_aenq aenq;
105 	u8 __iomem *reg_bar;
106 	void *dmadev;
107 	void *efa_dev;
108 	u32 supported_features;
109 	u32 dma_addr_bits;
110 
111 	struct efa_com_mmio_read mmio_read;
112 };
113 
114 typedef void (*efa_aenq_handler)(void *data,
115 	      struct efa_admin_aenq_entry *aenq_e);
116 
117 /* Holds aenq handlers. Indexed by AENQ event group */
118 struct efa_aenq_handlers {
119 	efa_aenq_handler handlers[EFA_MAX_HANDLERS];
120 	efa_aenq_handler unimplemented_handler;
121 };
122 
123 int efa_com_admin_init(struct efa_com_dev *edev,
124 		       struct efa_aenq_handlers *aenq_handlers);
125 void efa_com_admin_destroy(struct efa_com_dev *edev);
126 int efa_com_dev_reset(struct efa_com_dev *edev,
127 		      enum efa_regs_reset_reason_types reset_reason);
128 void efa_com_set_admin_polling_mode(struct efa_com_dev *edev, bool polling);
129 void efa_com_admin_q_comp_intr_handler(struct efa_com_dev *edev);
130 int efa_com_mmio_reg_read_init(struct efa_com_dev *edev);
131 void efa_com_mmio_reg_read_destroy(struct efa_com_dev *edev);
132 
133 int efa_com_validate_version(struct efa_com_dev *edev);
134 int efa_com_get_dma_width(struct efa_com_dev *edev);
135 
136 int efa_com_cmd_exec(struct efa_com_admin_queue *aq,
137 		     struct efa_admin_aq_entry *cmd,
138 		     size_t cmd_size,
139 		     struct efa_admin_acq_entry *comp,
140 		     size_t comp_size);
141 void efa_com_aenq_intr_handler(struct efa_com_dev *edev, void *data);
142 
143 #endif /* _EFA_COM_H_ */
144