tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2/* Copyright (c) 2021, Microsoft Corporation. */
3
4#ifndef _HW_CHANNEL_H
5#define _HW_CHANNEL_H
6
7#define DEFAULT_LOG2_THROTTLING_FOR_ERROR_EQ 4
8
9#define HW_CHANNEL_MAX_REQUEST_SIZE 0x1000
10#define HW_CHANNEL_MAX_RESPONSE_SIZE 0x1000
11
12#define HW_CHANNEL_VF_BOOTSTRAP_QUEUE_DEPTH 1
13
14#define HWC_INIT_DATA_CQID 1
15#define HWC_INIT_DATA_RQID 2
16#define HWC_INIT_DATA_SQID 3
17#define HWC_INIT_DATA_QUEUE_DEPTH 4
18#define HWC_INIT_DATA_MAX_REQUEST 5
19#define HWC_INIT_DATA_MAX_RESPONSE 6
20#define HWC_INIT_DATA_MAX_NUM_CQS 7
21#define HWC_INIT_DATA_PDID 8
22#define HWC_INIT_DATA_GPA_MKEY 9
23#define HWC_INIT_DATA_PF_DEST_RQ_ID 10
24#define HWC_INIT_DATA_PF_DEST_CQ_ID 11
25
26#define HWC_DATA_CFG_HWC_TIMEOUT 1
27
28#define HW_CHANNEL_WAIT_RESOURCE_TIMEOUT_MS 30000
29
30/* Structures labeled with "HW DATA" are exchanged with the hardware. All of
31 * them are naturally aligned and hence don't need __packed.
32 */
33
34union hwc_init_eq_id_db {
35 u32 as_uint32;
36
37 struct {
38 u32 eq_id : 16;
39 u32 doorbell : 16;
40 };
41}; /* HW DATA */
42
43union hwc_init_type_data {
44 u32 as_uint32;
45
46 struct {
47 u32 value : 24;
48 u32 type : 8;
49 };
50}; /* HW DATA */
51
52union hwc_init_soc_service_type {
53 u32 as_uint32;
54
55 struct {
56 u32 value : 28;
57 u32 type : 4;
58 };
59}; /* HW DATA */
60
61struct hwc_rx_oob {
62 u32 type : 6;
63 u32 eom : 1;
64 u32 som : 1;
65 u32 vendor_err : 8;
66 u32 reserved1 : 16;
67
68 u32 src_virt_wq : 24;
69 u32 src_vfid : 8;
70
71 u32 reserved2;
72
73 union {
74 u32 wqe_addr_low;
75 u32 wqe_offset;
76 };
77
78 u32 wqe_addr_high;
79
80 u32 client_data_unit : 14;
81 u32 reserved3 : 18;
82
83 u32 tx_oob_data_size;
84
85 u32 chunk_offset : 21;
86 u32 reserved4 : 11;
87}; /* HW DATA */
88
89struct hwc_tx_oob {
90 u32 reserved1;
91
92 u32 reserved2;
93
94 u32 vrq_id : 24;
95 u32 dest_vfid : 8;
96
97 u32 vrcq_id : 24;
98 u32 reserved3 : 8;
99
100 u32 vscq_id : 24;
101 u32 loopback : 1;
102 u32 lso_override: 1;
103 u32 dest_pf : 1;
104 u32 reserved4 : 5;
105
106 u32 vsq_id : 24;
107 u32 reserved5 : 8;
108}; /* HW DATA */
109
110struct hwc_work_request {
111 void *buf_va;
112 void *buf_sge_addr;
113 u32 buf_len;
114 u32 msg_size;
115
116 struct gdma_wqe_request wqe_req;
117 struct hwc_tx_oob tx_oob;
118
119 struct gdma_sge sge;
120};
121
122/* hwc_dma_buf represents the array of in-flight WQEs.
123 * mem_info as know as the GDMA mapped memory is partitioned and used by
124 * in-flight WQEs.
125 * The number of WQEs is determined by the number of in-flight messages.
126 */
127struct hwc_dma_buf {
128 struct gdma_mem_info mem_info;
129
130 u32 gpa_mkey;
131
132 u32 num_reqs;
133 struct hwc_work_request reqs[] __counted_by(num_reqs);
134};
135
136typedef void hwc_rx_event_handler_t(void *ctx, u32 gdma_rxq_id,
137 const struct hwc_rx_oob *rx_oob);
138
139typedef void hwc_tx_event_handler_t(void *ctx, u32 gdma_txq_id,
140 const struct hwc_rx_oob *rx_oob);
141
142struct hwc_cq {
143 struct hw_channel_context *hwc;
144
145 struct gdma_queue *gdma_cq;
146 struct gdma_queue *gdma_eq;
147 struct gdma_comp *comp_buf;
148 u16 queue_depth;
149
150 hwc_rx_event_handler_t *rx_event_handler;
151 void *rx_event_ctx;
152
153 hwc_tx_event_handler_t *tx_event_handler;
154 void *tx_event_ctx;
155};
156
157struct hwc_wq {
158 struct hw_channel_context *hwc;
159
160 struct gdma_queue *gdma_wq;
161 struct hwc_dma_buf *msg_buf;
162 u16 queue_depth;
163
164 struct hwc_cq *hwc_cq;
165};
166
167struct hwc_caller_ctx {
168 struct completion comp_event;
169 void *output_buf;
170 u32 output_buflen;
171
172 u32 error; /* Linux error code */
173 u32 status_code;
174};
175
176struct hw_channel_context {
177 struct gdma_dev *gdma_dev;
178 struct device *dev;
179
180 u16 num_inflight_msg;
181 u32 max_req_msg_size;
182
183 u16 hwc_init_q_depth_max;
184 u32 hwc_init_max_req_msg_size;
185 u32 hwc_init_max_resp_msg_size;
186
187 struct completion hwc_init_eqe_comp;
188
189 struct hwc_wq *rxq;
190 struct hwc_wq *txq;
191 struct hwc_cq *cq;
192
193 struct semaphore sema;
194 struct gdma_resource inflight_msg_res;
195
196 u32 pf_dest_vrq_id;
197 u32 pf_dest_vrcq_id;
198 u32 hwc_timeout;
199
200 struct hwc_caller_ctx *caller_ctx;
201};
202
203int mana_hwc_create_channel(struct gdma_context *gc);
204void mana_hwc_destroy_channel(struct gdma_context *gc);
205
206int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
207 const void *req, u32 resp_len, void *resp);
208
209#endif /* _HW_CHANNEL_H */