1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2/*
3 * Copyright(c) 2023 - Cornelis Networks, Inc.
4 * Copyright(c) 2015 - 2018 Intel Corporation.
5 */
6#ifndef _HFI1_USER_SDMA_H
7#define _HFI1_USER_SDMA_H
8
9#include <linux/device.h>
10#include <linux/wait.h>
11
12#include "common.h"
13#include "iowait.h"
14#include "user_exp_rcv.h"
15#include "mmu_rb.h"
16#include "pinning.h"
17#include "sdma.h"
18
19/* The maximum number of Data io vectors per message/request */
20#define MAX_VECTORS_PER_REQ 8
21/*
22 * Maximum number of packet to send from each message/request
23 * before moving to the next one.
24 */
25#define MAX_PKTS_PER_QUEUE 16
26
27#define num_pages(x) (1 + ((((x) - 1) & PAGE_MASK) >> PAGE_SHIFT))
28
29#define req_opcode(x) \
30 (((x) >> HFI1_SDMA_REQ_OPCODE_SHIFT) & HFI1_SDMA_REQ_OPCODE_MASK)
31#define req_version(x) \
32 (((x) >> HFI1_SDMA_REQ_VERSION_SHIFT) & HFI1_SDMA_REQ_OPCODE_MASK)
33#define req_iovcnt(x) \
34 (((x) >> HFI1_SDMA_REQ_IOVCNT_SHIFT) & HFI1_SDMA_REQ_IOVCNT_MASK)
35
36/* Number of BTH.PSN bits used for sequence number in expected rcvs */
37#define BTH_SEQ_MASK 0x7ffull
38
39#define AHG_KDETH_INTR_SHIFT 12
40#define AHG_KDETH_SH_SHIFT 13
41#define AHG_KDETH_ARRAY_SIZE 9
42
43#define PBC2LRH(x) ((((x) & 0xfff) << 2) - 4)
44#define LRH2PBC(x) ((((x) >> 2) + 1) & 0xfff)
45
46/**
47 * Build an SDMA AHG header update descriptor and save it to an array.
48 * @arr - Array to save the descriptor to.
49 * @idx - Index of the array at which the descriptor will be saved.
50 * @array_size - Size of the array arr.
51 * @dw - Update index into the header in DWs.
52 * @bit - Start bit.
53 * @width - Field width.
54 * @value - 16 bits of immediate data to write into the field.
55 * Returns -ERANGE if idx is invalid. If successful, returns the next index
56 * (idx + 1) of the array to be used for the next descriptor.
57 */
58static inline int ahg_header_set(u32 *arr, int idx, size_t array_size,
59 u8 dw, u8 bit, u8 width, u16 value)
60{
61 if ((size_t)idx >= array_size)
62 return -ERANGE;
63 arr[idx++] = sdma_build_ahg_descriptor(data: value, dwindex: dw, startbit: bit, bits: width);
64 return idx;
65}
66
67/* Tx request flag bits */
68#define TXREQ_FLAGS_REQ_ACK BIT(0) /* Set the ACK bit in the header */
69#define TXREQ_FLAGS_REQ_DISABLE_SH BIT(1) /* Disable header suppression */
70
71enum pkt_q_sdma_state {
72 SDMA_PKT_Q_ACTIVE,
73 SDMA_PKT_Q_DEFERRED,
74};
75
76#define SDMA_IOWAIT_TIMEOUT 1000 /* in milliseconds */
77
78#define SDMA_DBG(req, fmt, ...) \
79 hfi1_cdbg(SDMA, "[%u:%u:%u:%u] " fmt, (req)->pq->dd->unit, \
80 (req)->pq->ctxt, (req)->pq->subctxt, (req)->info.comp_idx, \
81 ##__VA_ARGS__)
82
83struct hfi1_user_sdma_pkt_q {
84 u16 ctxt;
85 u16 subctxt;
86 u16 n_max_reqs;
87 atomic_t n_reqs;
88 u16 reqidx;
89 struct hfi1_devdata *dd;
90 struct kmem_cache *txreq_cache;
91 struct user_sdma_request *reqs;
92 unsigned long *req_in_use;
93 struct iowait busy;
94 enum pkt_q_sdma_state state;
95 wait_queue_head_t wait;
96 unsigned long unpinned;
97 struct mmu_rb_handler *handler;
98 atomic_t n_locked;
99};
100
101struct hfi1_user_sdma_comp_q {
102 u16 nentries;
103 struct hfi1_sdma_comp_entry *comps;
104};
105
106struct user_sdma_iovec {
107 struct list_head list;
108 struct iovec iov;
109 /*
110 * offset into the virtual address space of the vector at
111 * which we last left off.
112 */
113 u64 offset;
114};
115
116/* evict operation argument */
117struct evict_data {
118 u32 cleared; /* count evicted so far */
119 u32 target; /* target count to evict */
120};
121
122struct user_sdma_request {
123 /* This is the original header from user space */
124 struct hfi1_pkt_header hdr;
125
126 /* Read mostly fields */
127 struct hfi1_user_sdma_pkt_q *pq ____cacheline_aligned_in_smp;
128 struct hfi1_user_sdma_comp_q *cq;
129 /*
130 * Pointer to the SDMA engine for this request.
131 * Since different request could be on different VLs,
132 * each request will need it's own engine pointer.
133 */
134 struct sdma_engine *sde;
135 struct sdma_req_info info;
136 /* TID array values copied from the tid_iov vector */
137 u32 *tids;
138 /* total length of the data in the request */
139 u32 data_len;
140 /* number of elements copied to the tids array */
141 u16 n_tids;
142 /*
143 * We copy the iovs for this request (based on
144 * info.iovcnt). These are only the data vectors
145 */
146 u8 data_iovs;
147 s8 ahg_idx;
148
149 /* Writeable fields shared with interrupt */
150 u16 seqcomp ____cacheline_aligned_in_smp;
151 u16 seqsubmitted;
152
153 /* Send side fields */
154 struct list_head txps ____cacheline_aligned_in_smp;
155 u16 seqnum;
156 /*
157 * KDETH.OFFSET (TID) field
158 * The offset can cover multiple packets, depending on the
159 * size of the TID entry.
160 */
161 u32 tidoffset;
162 /*
163 * KDETH.Offset (Eager) field
164 * We need to remember the initial value so the headers
165 * can be updated properly.
166 */
167 u32 koffset;
168 u32 sent;
169 /* TID index copied from the tid_iov vector */
170 u16 tididx;
171 /* progress index moving along the iovs array */
172 u8 iov_idx;
173 u8 has_error;
174
175 struct user_sdma_iovec iovs[MAX_VECTORS_PER_REQ];
176} ____cacheline_aligned_in_smp;
177
178/*
179 * A single txreq could span up to 3 physical pages when the MTU
180 * is sufficiently large (> 4K). Each of the IOV pointers also
181 * needs it's own set of flags so the vector has been handled
182 * independently of each other.
183 */
184struct user_sdma_txreq {
185 /* Packet header for the txreq */
186 struct hfi1_pkt_header hdr;
187 struct sdma_txreq txreq;
188 struct list_head list;
189 struct user_sdma_request *req;
190 u16 flags;
191 u16 seqnum;
192};
193
194int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt,
195 struct hfi1_filedata *fd);
196int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
197 struct hfi1_ctxtdata *uctxt);
198int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
199 struct iovec *iovec, unsigned long dim,
200 unsigned long *count);
201#endif /* _HFI1_USER_SDMA_H */
202

source code of linux/drivers/infiniband/hw/hfi1/user_sdma.h