Jeremy Kerr | 3d36ee2 | 2019-05-30 11:15:37 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */ |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 2 | |
Andrew Jeffery | 3286f17 | 2020-03-17 23:04:13 +1030 | [diff] [blame] | 3 | #if HAVE_CONFIG_H |
| 4 | #include "config.h" |
| 5 | #endif |
| 6 | |
| 7 | #if HAVE_ENDIAN_H |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 8 | #include <endian.h> |
Andrew Jeffery | 3286f17 | 2020-03-17 23:04:13 +1030 | [diff] [blame] | 9 | #endif |
| 10 | |
| 11 | #include <assert.h> |
Andrew Jeffery | 59c6a5c | 2020-01-17 15:52:51 +1030 | [diff] [blame] | 12 | #include <err.h> |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 13 | #include <errno.h> |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 14 | #include <inttypes.h> |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 15 | #include <stdbool.h> |
| 16 | #include <stdlib.h> |
| 17 | #include <string.h> |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 18 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 19 | #define pr_fmt(x) "astlpc: " x |
| 20 | |
| 21 | #include "libmctp.h" |
| 22 | #include "libmctp-alloc.h" |
| 23 | #include "libmctp-log.h" |
| 24 | #include "libmctp-astlpc.h" |
Przemyslaw Czarnowski | ff25d7e | 2020-03-26 11:39:37 +0100 | [diff] [blame] | 25 | #include "container_of.h" |
Andrew Jeffery | 4622cad | 2020-11-03 22:20:18 +1030 | [diff] [blame] | 26 | #include "range.h" |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 27 | |
Jeremy Kerr | b214c64 | 2019-11-27 11:34:00 +0800 | [diff] [blame] | 28 | #ifdef MCTP_HAVE_FILEIO |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 29 | |
Jeremy Kerr | c6f676d | 2019-12-19 09:24:06 +0800 | [diff] [blame] | 30 | #include <unistd.h> |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 31 | #include <fcntl.h> |
| 32 | #include <sys/ioctl.h> |
| 33 | #include <sys/mman.h> |
| 34 | #include <linux/aspeed-lpc-ctrl.h> |
| 35 | |
| 36 | /* kernel interface */ |
| 37 | static const char *kcs_path = "/dev/mctp0"; |
| 38 | static const char *lpc_path = "/dev/aspeed-lpc-ctrl"; |
| 39 | |
| 40 | #endif |
| 41 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 42 | struct mctp_astlpc_buffer { |
| 43 | uint32_t offset; |
| 44 | uint32_t size; |
| 45 | }; |
| 46 | |
| 47 | struct mctp_astlpc_layout { |
| 48 | struct mctp_astlpc_buffer rx; |
| 49 | struct mctp_astlpc_buffer tx; |
| 50 | }; |
| 51 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 52 | struct mctp_astlpc_protocol { |
| 53 | uint16_t version; |
| 54 | uint32_t (*packet_size)(uint32_t body); |
| 55 | uint32_t (*body_size)(uint32_t packet); |
| 56 | }; |
| 57 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 58 | struct mctp_binding_astlpc { |
| 59 | struct mctp_binding binding; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 60 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 61 | void *lpc_map; |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 62 | struct mctp_astlpc_layout layout; |
| 63 | |
| 64 | uint8_t mode; |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 65 | uint32_t requested_mtu; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 66 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 67 | const struct mctp_astlpc_protocol *proto; |
| 68 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 69 | /* direct ops data */ |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 70 | struct mctp_binding_astlpc_ops ops; |
| 71 | void *ops_data; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 72 | |
| 73 | /* fileio ops data */ |
Andrew Jeffery | 979c6a1 | 2020-05-23 20:04:49 +0930 | [diff] [blame] | 74 | int kcs_fd; |
| 75 | uint8_t kcs_status; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 76 | |
| 77 | bool running; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 78 | }; |
| 79 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 80 | #define binding_to_astlpc(b) \ |
| 81 | container_of(b, struct mctp_binding_astlpc, binding) |
| 82 | |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 83 | #define astlpc_prlog(ctx, lvl, fmt, ...) \ |
| 84 | do { \ |
| 85 | bool __bmc = ((ctx)->mode == MCTP_BINDING_ASTLPC_MODE_BMC); \ |
| 86 | mctp_prlog(lvl, pr_fmt("%s: " fmt), __bmc ? "bmc" : "host", \ |
| 87 | ##__VA_ARGS__); \ |
| 88 | } while (0) |
| 89 | |
| 90 | #define astlpc_prerr(ctx, fmt, ...) \ |
| 91 | astlpc_prlog(ctx, MCTP_LOG_ERR, fmt, ##__VA_ARGS__) |
| 92 | #define astlpc_prwarn(ctx, fmt, ...) \ |
| 93 | astlpc_prlog(ctx, MCTP_LOG_WARNING, fmt, ##__VA_ARGS__) |
| 94 | #define astlpc_prinfo(ctx, fmt, ...) \ |
| 95 | astlpc_prlog(ctx, MCTP_LOG_INFO, fmt, ##__VA_ARGS__) |
| 96 | #define astlpc_prdebug(ctx, fmt, ...) \ |
| 97 | astlpc_prlog(ctx, MCTP_LOG_DEBUG, fmt, ##__VA_ARGS__) |
| 98 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 99 | /* clang-format off */ |
| 100 | #define ASTLPC_MCTP_MAGIC 0x4d435450 |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 101 | #define ASTLPC_VER_BAD 0 |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 102 | #define ASTLPC_VER_MIN 1 |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 103 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 104 | /* Support testing of new binding protocols */ |
| 105 | #ifndef ASTLPC_VER_CUR |
Andrew Jeffery | 5303d9c | 2020-06-09 13:37:46 +0930 | [diff] [blame] | 106 | #define ASTLPC_VER_CUR 2 |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 107 | #endif |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 108 | /* clang-format on */ |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 109 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 110 | #ifndef ARRAY_SIZE |
| 111 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) |
| 112 | #endif |
| 113 | |
| 114 | static uint32_t astlpc_packet_size_v1(uint32_t body) |
| 115 | { |
| 116 | assert((body + 4) > body); |
| 117 | |
| 118 | return body + 4; |
| 119 | } |
| 120 | |
| 121 | static uint32_t astlpc_body_size_v1(uint32_t packet) |
| 122 | { |
| 123 | assert((packet - 4) < packet); |
| 124 | |
| 125 | return packet - 4; |
| 126 | } |
| 127 | |
| 128 | static const struct mctp_astlpc_protocol astlpc_protocol_version[] = { |
| 129 | [0] = { |
| 130 | .version = 0, |
| 131 | .packet_size = NULL, |
| 132 | .body_size = NULL, |
| 133 | }, |
| 134 | [1] = { |
| 135 | .version = 1, |
| 136 | .packet_size = astlpc_packet_size_v1, |
| 137 | .body_size = astlpc_body_size_v1, |
| 138 | }, |
| 139 | [2] = { |
| 140 | .version = 2, |
| 141 | .packet_size = astlpc_packet_size_v1, |
| 142 | .body_size = astlpc_body_size_v1, |
| 143 | }, |
| 144 | }; |
| 145 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 146 | struct mctp_lpcmap_hdr { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 147 | uint32_t magic; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 148 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 149 | uint16_t bmc_ver_min; |
| 150 | uint16_t bmc_ver_cur; |
| 151 | uint16_t host_ver_min; |
| 152 | uint16_t host_ver_cur; |
| 153 | uint16_t negotiated_ver; |
| 154 | uint16_t pad0; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 155 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 156 | struct { |
| 157 | uint32_t rx_offset; |
| 158 | uint32_t rx_size; |
| 159 | uint32_t tx_offset; |
| 160 | uint32_t tx_size; |
| 161 | } layout; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 162 | } __attribute__((packed)); |
| 163 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 164 | static const uint32_t control_size = 0x100; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 165 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 166 | #define LPC_WIN_SIZE (1 * 1024 * 1024) |
| 167 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 168 | #define KCS_STATUS_BMC_READY 0x80 |
| 169 | #define KCS_STATUS_CHANNEL_ACTIVE 0x40 |
| 170 | #define KCS_STATUS_IBF 0x02 |
| 171 | #define KCS_STATUS_OBF 0x01 |
| 172 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 173 | static inline int mctp_astlpc_kcs_write(struct mctp_binding_astlpc *astlpc, |
| 174 | enum mctp_binding_astlpc_kcs_reg reg, |
| 175 | uint8_t val) |
| 176 | { |
| 177 | return astlpc->ops.kcs_write(astlpc->ops_data, reg, val); |
| 178 | } |
| 179 | |
| 180 | static inline int mctp_astlpc_kcs_read(struct mctp_binding_astlpc *astlpc, |
| 181 | enum mctp_binding_astlpc_kcs_reg reg, |
| 182 | uint8_t *val) |
| 183 | { |
| 184 | return astlpc->ops.kcs_read(astlpc->ops_data, reg, val); |
| 185 | } |
| 186 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 187 | static inline int mctp_astlpc_lpc_write(struct mctp_binding_astlpc *astlpc, |
| 188 | const void *buf, long offset, |
| 189 | size_t len) |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 190 | { |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 191 | astlpc_prdebug(astlpc, "%s: %zu bytes to 0x%lx", __func__, len, offset); |
| 192 | |
| 193 | assert(offset >= 0); |
| 194 | |
| 195 | /* Indirect access */ |
| 196 | if (astlpc->ops.lpc_write) { |
| 197 | void *data = astlpc->ops_data; |
| 198 | |
| 199 | return astlpc->ops.lpc_write(data, buf, offset, len); |
| 200 | } |
| 201 | |
| 202 | /* Direct mapping */ |
| 203 | assert(astlpc->lpc_map); |
| 204 | memcpy(&((char *)astlpc->lpc_map)[offset], buf, len); |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static inline int mctp_astlpc_lpc_read(struct mctp_binding_astlpc *astlpc, |
| 210 | void *buf, long offset, size_t len) |
| 211 | { |
| 212 | astlpc_prdebug(astlpc, "%s: %zu bytes from 0x%lx", __func__, len, |
| 213 | offset); |
| 214 | |
| 215 | assert(offset >= 0); |
| 216 | |
| 217 | /* Indirect access */ |
| 218 | if (astlpc->ops.lpc_read) { |
| 219 | void *data = astlpc->ops_data; |
| 220 | |
| 221 | return astlpc->ops.lpc_read(data, buf, offset, len); |
| 222 | } |
| 223 | |
| 224 | /* Direct mapping */ |
| 225 | assert(astlpc->lpc_map); |
| 226 | memcpy(buf, &((char *)astlpc->lpc_map)[offset], len); |
| 227 | |
| 228 | return 0; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 229 | } |
| 230 | |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 231 | static int mctp_astlpc_kcs_set_status(struct mctp_binding_astlpc *astlpc, |
| 232 | uint8_t status) |
| 233 | { |
| 234 | uint8_t data; |
| 235 | int rc; |
| 236 | |
| 237 | /* Since we're setting the status register, we want the other endpoint |
| 238 | * to be interrupted. However, some hardware may only raise a host-side |
| 239 | * interrupt on an ODR event. |
| 240 | * So, write a dummy value of 0xff to ODR, which will ensure that an |
| 241 | * interrupt is triggered, and can be ignored by the host. |
| 242 | */ |
| 243 | data = 0xff; |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 244 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 245 | rc = mctp_astlpc_kcs_write(astlpc, MCTP_ASTLPC_KCS_REG_STATUS, status); |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 246 | if (rc) { |
| 247 | astlpc_prwarn(astlpc, "KCS status write failed"); |
| 248 | return -1; |
| 249 | } |
| 250 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 251 | rc = mctp_astlpc_kcs_write(astlpc, MCTP_ASTLPC_KCS_REG_DATA, data); |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 252 | if (rc) { |
| 253 | astlpc_prwarn(astlpc, "KCS dummy data write failed"); |
| 254 | return -1; |
| 255 | } |
| 256 | |
| 257 | return 0; |
| 258 | } |
| 259 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 260 | static int mctp_astlpc_layout_read(struct mctp_binding_astlpc *astlpc, |
| 261 | struct mctp_astlpc_layout *layout) |
| 262 | { |
| 263 | struct mctp_lpcmap_hdr hdr; |
| 264 | int rc; |
| 265 | |
| 266 | rc = mctp_astlpc_lpc_read(astlpc, &hdr, 0, sizeof(hdr)); |
| 267 | if (rc < 0) |
| 268 | return rc; |
| 269 | |
| 270 | /* Flip the buffers as the names are defined in terms of the host */ |
| 271 | if (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_BMC) { |
| 272 | layout->rx.offset = be32toh(hdr.layout.tx_offset); |
| 273 | layout->rx.size = be32toh(hdr.layout.tx_size); |
| 274 | layout->tx.offset = be32toh(hdr.layout.rx_offset); |
| 275 | layout->tx.size = be32toh(hdr.layout.rx_size); |
| 276 | } else { |
| 277 | assert(astlpc->mode == MCTP_BINDING_ASTLPC_MODE_HOST); |
| 278 | |
| 279 | layout->rx.offset = be32toh(hdr.layout.rx_offset); |
| 280 | layout->rx.size = be32toh(hdr.layout.rx_size); |
| 281 | layout->tx.offset = be32toh(hdr.layout.tx_offset); |
| 282 | layout->tx.size = be32toh(hdr.layout.tx_size); |
| 283 | } |
| 284 | |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static int mctp_astlpc_layout_write(struct mctp_binding_astlpc *astlpc, |
| 289 | struct mctp_astlpc_layout *layout) |
| 290 | { |
| 291 | uint32_t rx_size_be; |
| 292 | |
| 293 | if (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_BMC) { |
| 294 | struct mctp_lpcmap_hdr hdr; |
| 295 | |
| 296 | /* |
| 297 | * Flip the buffers as the names are defined in terms of the |
| 298 | * host |
| 299 | */ |
| 300 | hdr.layout.rx_offset = htobe32(layout->tx.offset); |
| 301 | hdr.layout.rx_size = htobe32(layout->tx.size); |
| 302 | hdr.layout.tx_offset = htobe32(layout->rx.offset); |
| 303 | hdr.layout.tx_size = htobe32(layout->rx.size); |
| 304 | |
| 305 | return mctp_astlpc_lpc_write(astlpc, &hdr.layout, |
| 306 | offsetof(struct mctp_lpcmap_hdr, layout), |
| 307 | sizeof(hdr.layout)); |
| 308 | } |
| 309 | |
| 310 | assert(astlpc->mode == MCTP_BINDING_ASTLPC_MODE_HOST); |
| 311 | |
| 312 | /* |
| 313 | * As of v2 we only need to write rx_size - the offsets are controlled |
| 314 | * by the BMC, as is the BMC's rx_size (host tx_size). |
| 315 | */ |
| 316 | rx_size_be = htobe32(layout->rx.size); |
| 317 | return mctp_astlpc_lpc_write(astlpc, &rx_size_be, |
| 318 | offsetof(struct mctp_lpcmap_hdr, layout.rx_size), |
| 319 | sizeof(rx_size_be)); |
| 320 | } |
| 321 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 322 | static bool |
| 323 | mctp_astlpc_buffer_validate(const struct mctp_binding_astlpc *astlpc, |
| 324 | const struct mctp_astlpc_buffer *buf, |
| 325 | const char *name) |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 326 | { |
| 327 | /* Check for overflow */ |
| 328 | if (buf->offset + buf->size < buf->offset) { |
| 329 | mctp_prerr( |
| 330 | "%s packet buffer parameters overflow: offset: 0x%" PRIx32 |
| 331 | ", size: %" PRIu32, |
| 332 | name, buf->offset, buf->size); |
| 333 | return false; |
| 334 | } |
| 335 | |
| 336 | /* Check that the buffers are contained within the allocated space */ |
| 337 | if (buf->offset + buf->size > LPC_WIN_SIZE) { |
| 338 | mctp_prerr( |
| 339 | "%s packet buffer parameters exceed %uM window size: offset: 0x%" PRIx32 |
| 340 | ", size: %" PRIu32, |
| 341 | name, (LPC_WIN_SIZE / (1024 * 1024)), buf->offset, |
| 342 | buf->size); |
| 343 | return false; |
| 344 | } |
| 345 | |
| 346 | /* Check that the baseline transmission unit is supported */ |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 347 | if (buf->size < astlpc->proto->packet_size(MCTP_PACKET_SIZE(MCTP_BTU))) { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 348 | mctp_prerr( |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 349 | "%s packet buffer too small: Require %" PRIu32 " bytes to support the %u byte baseline transmission unit, found %" PRIu32, |
| 350 | name, |
| 351 | astlpc->proto->packet_size(MCTP_PACKET_SIZE(MCTP_BTU)), |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 352 | MCTP_BTU, buf->size); |
| 353 | return false; |
| 354 | } |
| 355 | |
| 356 | /* Check for overlap with the control space */ |
| 357 | if (buf->offset < control_size) { |
| 358 | mctp_prerr( |
| 359 | "%s packet buffer overlaps control region {0x%" PRIx32 |
| 360 | ", %" PRIu32 "}: Rx {0x%" PRIx32 ", %" PRIu32 "}", |
| 361 | name, 0U, control_size, buf->offset, buf->size); |
| 362 | return false; |
| 363 | } |
| 364 | |
| 365 | return true; |
| 366 | } |
| 367 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 368 | static bool |
| 369 | mctp_astlpc_layout_validate(const struct mctp_binding_astlpc *astlpc, |
| 370 | const struct mctp_astlpc_layout *layout) |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 371 | { |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 372 | const struct mctp_astlpc_buffer *rx = &layout->rx; |
| 373 | const struct mctp_astlpc_buffer *tx = &layout->tx; |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 374 | bool rx_valid, tx_valid; |
| 375 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 376 | rx_valid = mctp_astlpc_buffer_validate(astlpc, rx, "Rx"); |
| 377 | tx_valid = mctp_astlpc_buffer_validate(astlpc, tx, "Tx"); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 378 | |
| 379 | if (!(rx_valid && tx_valid)) |
| 380 | return false; |
| 381 | |
| 382 | /* Check that the buffers are disjoint */ |
| 383 | if ((rx->offset <= tx->offset && rx->offset + rx->size > tx->offset) || |
| 384 | (tx->offset <= rx->offset && tx->offset + tx->size > rx->offset)) { |
| 385 | mctp_prerr("Rx and Tx packet buffers overlap: Rx {0x%" PRIx32 |
| 386 | ", %" PRIu32 "}, Tx {0x%" PRIx32 ", %" PRIu32 "}", |
| 387 | rx->offset, rx->size, tx->offset, tx->size); |
| 388 | return false; |
| 389 | } |
| 390 | |
| 391 | return true; |
| 392 | } |
| 393 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 394 | static int mctp_astlpc_init_bmc(struct mctp_binding_astlpc *astlpc) |
| 395 | { |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 396 | struct mctp_lpcmap_hdr hdr = { 0 }; |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 397 | uint8_t status; |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 398 | uint32_t sz; |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 399 | |
| 400 | /* |
| 401 | * The largest buffer size is half of the allocated MCTP space |
| 402 | * excluding the control space. |
| 403 | */ |
| 404 | sz = ((LPC_WIN_SIZE - control_size) / 2); |
| 405 | |
| 406 | /* |
| 407 | * Trim the MTU to a multiple of 16 to meet the requirements of 12.17 |
| 408 | * Query Hop in DSP0236 v1.3.0. |
| 409 | */ |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 410 | sz = MCTP_BODY_SIZE(astlpc->proto->body_size(sz)); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 411 | sz &= ~0xfUL; |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 412 | sz = astlpc->proto->packet_size(MCTP_PACKET_SIZE(sz)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 413 | |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 414 | if (astlpc->requested_mtu) { |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 415 | uint32_t rpkt, rmtu; |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 416 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 417 | rmtu = astlpc->requested_mtu; |
| 418 | rpkt = astlpc->proto->packet_size(MCTP_PACKET_SIZE(rmtu)); |
| 419 | sz = MIN(sz, rpkt); |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 420 | } |
| 421 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 422 | /* Flip the buffers as the names are defined in terms of the host */ |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 423 | astlpc->layout.tx.offset = control_size; |
| 424 | astlpc->layout.tx.size = sz; |
| 425 | astlpc->layout.rx.offset = |
| 426 | astlpc->layout.tx.offset + astlpc->layout.tx.size; |
| 427 | astlpc->layout.rx.size = sz; |
| 428 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 429 | if (!mctp_astlpc_layout_validate(astlpc, &astlpc->layout)) { |
| 430 | astlpc_prerr(astlpc, "Cannot support an MTU of %" PRIu32, sz); |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 431 | return -EINVAL; |
| 432 | } |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 433 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 434 | hdr = (struct mctp_lpcmap_hdr){ |
| 435 | .magic = htobe32(ASTLPC_MCTP_MAGIC), |
| 436 | .bmc_ver_min = htobe16(ASTLPC_VER_MIN), |
| 437 | .bmc_ver_cur = htobe16(ASTLPC_VER_CUR), |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 438 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 439 | /* Flip the buffers back as we're now describing the host's |
| 440 | * configuration to the host */ |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 441 | .layout.rx_offset = htobe32(astlpc->layout.tx.offset), |
| 442 | .layout.rx_size = htobe32(astlpc->layout.tx.size), |
| 443 | .layout.tx_offset = htobe32(astlpc->layout.rx.offset), |
| 444 | .layout.tx_size = htobe32(astlpc->layout.rx.size), |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 445 | }; |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 446 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 447 | mctp_astlpc_lpc_write(astlpc, &hdr, 0, sizeof(hdr)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 448 | |
Andrew Jeffery | b3b55a6 | 2020-07-06 13:34:18 +0930 | [diff] [blame] | 449 | /* |
| 450 | * Set status indicating that the BMC is now active. Be explicit about |
| 451 | * clearing OBF; we're reinitialising the binding and so any previous |
| 452 | * buffer state is irrelevant. |
| 453 | */ |
| 454 | status = KCS_STATUS_BMC_READY & ~KCS_STATUS_OBF; |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 455 | return mctp_astlpc_kcs_set_status(astlpc, status); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | static int mctp_binding_astlpc_start_bmc(struct mctp_binding *b) |
| 459 | { |
| 460 | struct mctp_binding_astlpc *astlpc = |
| 461 | container_of(b, struct mctp_binding_astlpc, binding); |
| 462 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 463 | astlpc->proto = &astlpc_protocol_version[ASTLPC_VER_CUR]; |
| 464 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 465 | return mctp_astlpc_init_bmc(astlpc); |
| 466 | } |
| 467 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 468 | static bool mctp_astlpc_validate_version(uint16_t bmc_ver_min, |
| 469 | uint16_t bmc_ver_cur, |
| 470 | uint16_t host_ver_min, |
| 471 | uint16_t host_ver_cur) |
| 472 | { |
| 473 | if (!(bmc_ver_min && bmc_ver_cur && host_ver_min && host_ver_cur)) { |
| 474 | mctp_prerr("Invalid version present in [%" PRIu16 ", %" PRIu16 |
| 475 | "], [%" PRIu16 ", %" PRIu16 "]", |
| 476 | bmc_ver_min, bmc_ver_cur, host_ver_min, |
| 477 | host_ver_cur); |
| 478 | return false; |
| 479 | } else if (bmc_ver_min > bmc_ver_cur) { |
| 480 | mctp_prerr("Invalid bmc version range [%" PRIu16 ", %" PRIu16 |
| 481 | "]", |
| 482 | bmc_ver_min, bmc_ver_cur); |
| 483 | return false; |
| 484 | } else if (host_ver_min > host_ver_cur) { |
| 485 | mctp_prerr("Invalid host version range [%" PRIu16 ", %" PRIu16 |
| 486 | "]", |
| 487 | host_ver_min, host_ver_cur); |
| 488 | return false; |
| 489 | } else if ((host_ver_cur < bmc_ver_min) || |
| 490 | (host_ver_min > bmc_ver_cur)) { |
| 491 | mctp_prerr( |
| 492 | "Unable to satisfy version negotiation with ranges [%" PRIu16 |
| 493 | ", %" PRIu16 "] and [%" PRIu16 ", %" PRIu16 "]", |
| 494 | bmc_ver_min, bmc_ver_cur, host_ver_min, host_ver_cur); |
| 495 | return false; |
| 496 | } |
| 497 | |
| 498 | return true; |
| 499 | } |
| 500 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 501 | static int mctp_astlpc_negotiate_layout_host(struct mctp_binding_astlpc *astlpc) |
| 502 | { |
| 503 | struct mctp_astlpc_layout layout; |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 504 | uint32_t rmtu; |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 505 | uint32_t sz; |
| 506 | int rc; |
| 507 | |
| 508 | rc = mctp_astlpc_layout_read(astlpc, &layout); |
| 509 | if (rc < 0) |
| 510 | return rc; |
| 511 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 512 | if (!mctp_astlpc_layout_validate(astlpc, &layout)) { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 513 | astlpc_prerr( |
| 514 | astlpc, |
| 515 | "BMC provided invalid buffer layout: Rx {0x%" PRIx32 |
| 516 | ", %" PRIu32 "}, Tx {0x%" PRIx32 ", %" PRIu32 "}", |
| 517 | layout.rx.offset, layout.rx.size, layout.tx.offset, |
| 518 | layout.tx.size); |
| 519 | return -EINVAL; |
| 520 | } |
| 521 | |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 522 | astlpc_prinfo(astlpc, "Desire an MTU of %" PRIu32 " bytes", |
| 523 | astlpc->requested_mtu); |
| 524 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 525 | rmtu = astlpc->requested_mtu; |
| 526 | sz = astlpc->proto->packet_size(MCTP_PACKET_SIZE(rmtu)); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 527 | layout.rx.size = sz; |
| 528 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 529 | if (!mctp_astlpc_layout_validate(astlpc, &layout)) { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 530 | astlpc_prerr( |
| 531 | astlpc, |
| 532 | "Generated invalid buffer layout with size %" PRIu32 |
| 533 | ": Rx {0x%" PRIx32 ", %" PRIu32 "}, Tx {0x%" PRIx32 |
| 534 | ", %" PRIu32 "}", |
| 535 | sz, layout.rx.offset, layout.rx.size, layout.tx.offset, |
| 536 | layout.tx.size); |
| 537 | return -EINVAL; |
| 538 | } |
| 539 | |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 540 | astlpc_prinfo(astlpc, "Requesting MTU of %" PRIu32 " bytes", |
| 541 | astlpc->requested_mtu); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 542 | |
| 543 | return mctp_astlpc_layout_write(astlpc, &layout); |
| 544 | } |
| 545 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 546 | static uint16_t mctp_astlpc_negotiate_version(uint16_t bmc_ver_min, |
| 547 | uint16_t bmc_ver_cur, |
| 548 | uint16_t host_ver_min, |
| 549 | uint16_t host_ver_cur) |
| 550 | { |
| 551 | if (!mctp_astlpc_validate_version(bmc_ver_min, bmc_ver_cur, |
| 552 | host_ver_min, host_ver_cur)) |
| 553 | return ASTLPC_VER_BAD; |
| 554 | |
| 555 | if (bmc_ver_cur < host_ver_cur) |
| 556 | return bmc_ver_cur; |
| 557 | |
| 558 | return host_ver_cur; |
| 559 | } |
| 560 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 561 | static int mctp_astlpc_init_host(struct mctp_binding_astlpc *astlpc) |
| 562 | { |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 563 | const uint16_t ver_min_be = htobe16(ASTLPC_VER_MIN); |
| 564 | const uint16_t ver_cur_be = htobe16(ASTLPC_VER_CUR); |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 565 | uint16_t bmc_ver_min, bmc_ver_cur, negotiated; |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 566 | struct mctp_lpcmap_hdr hdr; |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 567 | uint8_t status; |
| 568 | int rc; |
| 569 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 570 | rc = mctp_astlpc_kcs_read(astlpc, MCTP_ASTLPC_KCS_REG_STATUS, &status); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 571 | if (rc) { |
| 572 | mctp_prwarn("KCS status read failed"); |
| 573 | return rc; |
| 574 | } |
| 575 | |
| 576 | astlpc->kcs_status = status; |
| 577 | |
| 578 | if (!(status & KCS_STATUS_BMC_READY)) |
| 579 | return -EHOSTDOWN; |
| 580 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 581 | mctp_astlpc_lpc_read(astlpc, &hdr, 0, sizeof(hdr)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 582 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 583 | bmc_ver_min = be16toh(hdr.bmc_ver_min); |
| 584 | bmc_ver_cur = be16toh(hdr.bmc_ver_cur); |
| 585 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 586 | /* Calculate the expected value of negotiated_ver */ |
| 587 | negotiated = mctp_astlpc_negotiate_version(bmc_ver_min, bmc_ver_cur, |
| 588 | ASTLPC_VER_MIN, |
| 589 | ASTLPC_VER_CUR); |
| 590 | if (!negotiated) { |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 591 | astlpc_prerr(astlpc, "Cannot negotiate with invalid versions"); |
| 592 | return -EINVAL; |
| 593 | } |
| 594 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 595 | /* Assign protocol ops so we can calculate the packet buffer sizes */ |
| 596 | assert(negotiated < ARRAY_SIZE(astlpc_protocol_version)); |
| 597 | astlpc->proto = &astlpc_protocol_version[negotiated]; |
| 598 | |
| 599 | /* Negotiate packet buffers in v2 style if the BMC supports it */ |
| 600 | if (negotiated >= 2) { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 601 | rc = mctp_astlpc_negotiate_layout_host(astlpc); |
| 602 | if (rc < 0) |
| 603 | return rc; |
| 604 | } |
| 605 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 606 | /* Advertise the host's supported protocol versions */ |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 607 | mctp_astlpc_lpc_write(astlpc, &ver_min_be, |
| 608 | offsetof(struct mctp_lpcmap_hdr, host_ver_min), |
| 609 | sizeof(ver_min_be)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 610 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 611 | mctp_astlpc_lpc_write(astlpc, &ver_cur_be, |
| 612 | offsetof(struct mctp_lpcmap_hdr, host_ver_cur), |
| 613 | sizeof(ver_cur_be)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 614 | |
| 615 | /* Send channel init command */ |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 616 | rc = mctp_astlpc_kcs_write(astlpc, MCTP_ASTLPC_KCS_REG_DATA, 0x0); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 617 | if (rc) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 618 | astlpc_prwarn(astlpc, "KCS write failed"); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 619 | } |
| 620 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 621 | /* |
| 622 | * Configure the host so `astlpc->proto->version == 0` holds until we |
| 623 | * receive a subsequent status update from the BMC. Until then, |
| 624 | * `astlpc->proto->version == 0` indicates that we're yet to complete |
| 625 | * the channel initialisation handshake. |
| 626 | * |
| 627 | * When the BMC provides a status update with KCS_STATUS_CHANNEL_ACTIVE |
| 628 | * set we will assign the appropriate protocol ops struct in accordance |
| 629 | * with `negotiated_ver`. |
| 630 | */ |
| 631 | astlpc->proto = &astlpc_protocol_version[ASTLPC_VER_BAD]; |
| 632 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 633 | return rc; |
| 634 | } |
| 635 | |
| 636 | static int mctp_binding_astlpc_start_host(struct mctp_binding *b) |
| 637 | { |
| 638 | struct mctp_binding_astlpc *astlpc = |
| 639 | container_of(b, struct mctp_binding_astlpc, binding); |
| 640 | |
| 641 | return mctp_astlpc_init_host(astlpc); |
| 642 | } |
| 643 | |
| 644 | static bool __mctp_astlpc_kcs_ready(struct mctp_binding_astlpc *astlpc, |
| 645 | uint8_t status, bool is_write) |
| 646 | { |
| 647 | bool is_bmc; |
| 648 | bool ready_state; |
| 649 | uint8_t flag; |
| 650 | |
| 651 | is_bmc = (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_BMC); |
| 652 | flag = (is_bmc ^ is_write) ? KCS_STATUS_IBF : KCS_STATUS_OBF; |
| 653 | ready_state = is_write ? 0 : 1; |
| 654 | |
| 655 | return !!(status & flag) == ready_state; |
| 656 | } |
| 657 | |
| 658 | static inline bool |
| 659 | mctp_astlpc_kcs_read_ready(struct mctp_binding_astlpc *astlpc, uint8_t status) |
| 660 | { |
| 661 | return __mctp_astlpc_kcs_ready(astlpc, status, false); |
| 662 | } |
| 663 | |
| 664 | static inline bool |
| 665 | mctp_astlpc_kcs_write_ready(struct mctp_binding_astlpc *astlpc, uint8_t status) |
| 666 | { |
| 667 | return __mctp_astlpc_kcs_ready(astlpc, status, true); |
| 668 | } |
| 669 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 670 | static int mctp_astlpc_kcs_send(struct mctp_binding_astlpc *astlpc, |
| 671 | uint8_t data) |
| 672 | { |
| 673 | uint8_t status; |
| 674 | int rc; |
| 675 | |
| 676 | for (;;) { |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 677 | rc = mctp_astlpc_kcs_read(astlpc, MCTP_ASTLPC_KCS_REG_STATUS, |
| 678 | &status); |
Andrew Jeffery | 1b27fe8 | 2020-01-24 16:05:11 +1030 | [diff] [blame] | 679 | if (rc) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 680 | astlpc_prwarn(astlpc, "KCS status read failed"); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 681 | return -1; |
| 682 | } |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 683 | if (mctp_astlpc_kcs_write_ready(astlpc, status)) |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 684 | break; |
| 685 | /* todo: timeout */ |
| 686 | } |
| 687 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 688 | rc = mctp_astlpc_kcs_write(astlpc, MCTP_ASTLPC_KCS_REG_DATA, data); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 689 | if (rc) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 690 | astlpc_prwarn(astlpc, "KCS data write failed"); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 691 | return -1; |
| 692 | } |
| 693 | |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | static int mctp_binding_astlpc_tx(struct mctp_binding *b, |
| 698 | struct mctp_pktbuf *pkt) |
| 699 | { |
| 700 | struct mctp_binding_astlpc *astlpc = binding_to_astlpc(b); |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 701 | uint32_t len, len_be; |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 702 | struct mctp_hdr *hdr; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 703 | |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 704 | hdr = mctp_pktbuf_hdr(pkt); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 705 | len = mctp_pktbuf_size(pkt); |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 706 | |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 707 | astlpc_prdebug(astlpc, |
| 708 | "%s: Transmitting %" PRIu32 |
| 709 | "-byte packet (%hhu, %hhu, 0x%hhx)", |
| 710 | __func__, len, hdr->src, hdr->dest, hdr->flags_seq_tag); |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 711 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 712 | if (len > astlpc->proto->body_size(astlpc->layout.tx.size)) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 713 | astlpc_prwarn(astlpc, "invalid TX len 0x%x", len); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 714 | return -1; |
| 715 | } |
| 716 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 717 | len_be = htobe32(len); |
| 718 | mctp_astlpc_lpc_write(astlpc, &len_be, astlpc->layout.tx.offset, |
| 719 | sizeof(len_be)); |
| 720 | mctp_astlpc_lpc_write(astlpc, hdr, astlpc->layout.tx.offset + 4, len); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 721 | |
| 722 | mctp_binding_set_tx_enabled(b, false); |
| 723 | |
| 724 | mctp_astlpc_kcs_send(astlpc, 0x1); |
| 725 | return 0; |
| 726 | } |
| 727 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 728 | static uint32_t mctp_astlpc_calculate_mtu(struct mctp_binding_astlpc *astlpc, |
| 729 | struct mctp_astlpc_layout *layout) |
| 730 | { |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 731 | uint32_t low, high, limit, rpkt; |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 732 | |
| 733 | /* Derive the largest MTU the BMC _can_ support */ |
| 734 | low = MIN(astlpc->layout.rx.offset, astlpc->layout.tx.offset); |
| 735 | high = MAX(astlpc->layout.rx.offset, astlpc->layout.tx.offset); |
| 736 | limit = high - low; |
| 737 | |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 738 | /* Determine the largest MTU the BMC _wants_ to support */ |
| 739 | if (astlpc->requested_mtu) { |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 740 | uint32_t rmtu = astlpc->requested_mtu; |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 741 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 742 | rpkt = astlpc->proto->packet_size(MCTP_PACKET_SIZE(rmtu)); |
| 743 | limit = MIN(limit, rpkt); |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 744 | } |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 745 | |
| 746 | /* Determine the accepted MTU, applied both directions by convention */ |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 747 | rpkt = MIN(limit, layout->tx.size); |
| 748 | return MCTP_BODY_SIZE(astlpc->proto->body_size(rpkt)); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 749 | } |
| 750 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 751 | static int mctp_astlpc_negotiate_layout_bmc(struct mctp_binding_astlpc *astlpc) |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 752 | { |
| 753 | struct mctp_astlpc_layout proposed, pending; |
| 754 | uint32_t sz, mtu; |
| 755 | int rc; |
| 756 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 757 | /* Do we have a valid protocol version? */ |
| 758 | if (!astlpc->proto->version) |
| 759 | return -EINVAL; |
| 760 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 761 | /* Extract the host's proposed layout */ |
| 762 | rc = mctp_astlpc_layout_read(astlpc, &proposed); |
| 763 | if (rc < 0) |
| 764 | return rc; |
| 765 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 766 | /* Do we have a reasonable layout? */ |
| 767 | if (!mctp_astlpc_layout_validate(astlpc, &proposed)) |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 768 | return -EINVAL; |
| 769 | |
| 770 | /* Negotiate the MTU */ |
| 771 | mtu = mctp_astlpc_calculate_mtu(astlpc, &proposed); |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 772 | sz = astlpc->proto->packet_size(MCTP_PACKET_SIZE(mtu)); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 773 | |
| 774 | /* |
| 775 | * Use symmetric MTUs by convention and to pass constraints in rx/tx |
| 776 | * functions |
| 777 | */ |
| 778 | pending = astlpc->layout; |
| 779 | pending.tx.size = sz; |
| 780 | pending.rx.size = sz; |
| 781 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 782 | if (mctp_astlpc_layout_validate(astlpc, &pending)) { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 783 | /* We found a sensible Rx MTU, so honour it */ |
| 784 | astlpc->layout = pending; |
| 785 | |
| 786 | /* Enforce the negotiated MTU */ |
| 787 | rc = mctp_astlpc_layout_write(astlpc, &astlpc->layout); |
| 788 | if (rc < 0) |
| 789 | return rc; |
| 790 | |
| 791 | astlpc_prinfo(astlpc, "Negotiated an MTU of %" PRIu32 " bytes", |
| 792 | mtu); |
| 793 | } else { |
| 794 | astlpc_prwarn(astlpc, "MTU negotiation failed"); |
| 795 | return -EINVAL; |
| 796 | } |
| 797 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 798 | if (astlpc->proto->version >= 2) |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 799 | astlpc->binding.pkt_size = MCTP_PACKET_SIZE(mtu); |
| 800 | |
| 801 | return 0; |
| 802 | } |
| 803 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 804 | static void mctp_astlpc_init_channel(struct mctp_binding_astlpc *astlpc) |
| 805 | { |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 806 | uint16_t negotiated, negotiated_be; |
| 807 | struct mctp_lpcmap_hdr hdr; |
| 808 | uint8_t status; |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 809 | int rc; |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 810 | |
| 811 | mctp_astlpc_lpc_read(astlpc, &hdr, 0, sizeof(hdr)); |
| 812 | |
| 813 | /* Version negotiation */ |
| 814 | negotiated = |
| 815 | mctp_astlpc_negotiate_version(ASTLPC_VER_MIN, ASTLPC_VER_CUR, |
| 816 | be16toh(hdr.host_ver_min), |
| 817 | be16toh(hdr.host_ver_cur)); |
| 818 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 819 | /* MTU negotiation requires knowing which protocol we'll use */ |
| 820 | assert(negotiated < ARRAY_SIZE(astlpc_protocol_version)); |
| 821 | astlpc->proto = &astlpc_protocol_version[negotiated]; |
| 822 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 823 | /* Host Rx MTU negotiation: Failure terminates channel init */ |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 824 | rc = mctp_astlpc_negotiate_layout_bmc(astlpc); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 825 | if (rc < 0) |
| 826 | negotiated = ASTLPC_VER_BAD; |
| 827 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 828 | /* Populate the negotiated version */ |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 829 | negotiated_be = htobe16(negotiated); |
| 830 | mctp_astlpc_lpc_write(astlpc, &negotiated_be, |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 831 | offsetof(struct mctp_lpcmap_hdr, negotiated_ver), |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 832 | sizeof(negotiated_be)); |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 833 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 834 | /* Finalise the configuration */ |
| 835 | status = KCS_STATUS_BMC_READY | KCS_STATUS_OBF; |
| 836 | if (negotiated > 0) { |
| 837 | astlpc_prinfo(astlpc, "Negotiated binding version %" PRIu16, |
| 838 | negotiated); |
| 839 | status |= KCS_STATUS_CHANNEL_ACTIVE; |
| 840 | } else { |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 841 | astlpc_prerr(astlpc, "Failed to initialise channel"); |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 842 | } |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 843 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 844 | mctp_astlpc_kcs_set_status(astlpc, status); |
| 845 | |
| 846 | mctp_binding_set_tx_enabled(&astlpc->binding, |
| 847 | status & KCS_STATUS_CHANNEL_ACTIVE); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 848 | } |
| 849 | |
| 850 | static void mctp_astlpc_rx_start(struct mctp_binding_astlpc *astlpc) |
| 851 | { |
| 852 | struct mctp_pktbuf *pkt; |
| 853 | uint32_t len; |
| 854 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 855 | mctp_astlpc_lpc_read(astlpc, &len, astlpc->layout.rx.offset, |
| 856 | sizeof(len)); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 857 | len = be32toh(len); |
| 858 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 859 | if (len > astlpc->proto->body_size(astlpc->layout.rx.size)) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 860 | astlpc_prwarn(astlpc, "invalid RX len 0x%x", len); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 861 | return; |
| 862 | } |
| 863 | |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 864 | assert(astlpc->binding.pkt_size >= 0); |
| 865 | if (len > (uint32_t)astlpc->binding.pkt_size) { |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 866 | mctp_prwarn("invalid RX len 0x%x", len); |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 867 | astlpc_prwarn(astlpc, "invalid RX len 0x%x", len); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 868 | return; |
| 869 | } |
| 870 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 871 | pkt = mctp_pktbuf_alloc(&astlpc->binding, len); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 872 | if (!pkt) |
| 873 | goto out_complete; |
| 874 | |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 875 | mctp_astlpc_lpc_read(astlpc, mctp_pktbuf_hdr(pkt), |
| 876 | astlpc->layout.rx.offset + 4, len); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 877 | |
| 878 | mctp_bus_rx(&astlpc->binding, pkt); |
| 879 | |
| 880 | out_complete: |
| 881 | mctp_astlpc_kcs_send(astlpc, 0x2); |
| 882 | } |
| 883 | |
| 884 | static void mctp_astlpc_tx_complete(struct mctp_binding_astlpc *astlpc) |
| 885 | { |
| 886 | mctp_binding_set_tx_enabled(&astlpc->binding, true); |
| 887 | } |
| 888 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 889 | static int mctp_astlpc_finalise_channel(struct mctp_binding_astlpc *astlpc) |
| 890 | { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 891 | struct mctp_astlpc_layout layout; |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 892 | uint16_t negotiated; |
| 893 | int rc; |
| 894 | |
| 895 | rc = mctp_astlpc_lpc_read(astlpc, &negotiated, |
| 896 | offsetof(struct mctp_lpcmap_hdr, |
| 897 | negotiated_ver), |
| 898 | sizeof(negotiated)); |
| 899 | if (rc < 0) |
| 900 | return rc; |
| 901 | |
| 902 | negotiated = be16toh(negotiated); |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 903 | astlpc_prerr(astlpc, "Version negotiation got: %u", negotiated); |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 904 | |
| 905 | if (negotiated == ASTLPC_VER_BAD || negotiated < ASTLPC_VER_MIN || |
| 906 | negotiated > ASTLPC_VER_CUR) { |
| 907 | astlpc_prerr(astlpc, "Failed to negotiate version, got: %u\n", |
| 908 | negotiated); |
| 909 | return -EINVAL; |
| 910 | } |
| 911 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 912 | assert(negotiated < ARRAY_SIZE(astlpc_protocol_version)); |
| 913 | astlpc->proto = &astlpc_protocol_version[negotiated]; |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 914 | |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 915 | rc = mctp_astlpc_layout_read(astlpc, &layout); |
| 916 | if (rc < 0) |
| 917 | return rc; |
| 918 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 919 | if (!mctp_astlpc_layout_validate(astlpc, &layout)) { |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 920 | mctp_prerr("BMC proposed invalid buffer parameters"); |
| 921 | return -EINVAL; |
| 922 | } |
| 923 | |
| 924 | astlpc->layout = layout; |
| 925 | |
| 926 | if (negotiated >= 2) |
| 927 | astlpc->binding.pkt_size = |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 928 | astlpc->proto->body_size(astlpc->layout.tx.size); |
Andrew Jeffery | 3a54066 | 2020-05-26 19:55:30 +0930 | [diff] [blame] | 929 | |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 930 | return 0; |
| 931 | } |
| 932 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 933 | static int mctp_astlpc_update_channel(struct mctp_binding_astlpc *astlpc, |
| 934 | uint8_t status) |
| 935 | { |
| 936 | uint8_t updated; |
| 937 | int rc = 0; |
| 938 | |
| 939 | assert(astlpc->mode == MCTP_BINDING_ASTLPC_MODE_HOST); |
| 940 | |
| 941 | updated = astlpc->kcs_status ^ status; |
| 942 | |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 943 | astlpc_prdebug(astlpc, "%s: status: 0x%x, update: 0x%x", __func__, |
| 944 | status, updated); |
| 945 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 946 | if (updated & KCS_STATUS_BMC_READY) { |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 947 | if (status & KCS_STATUS_BMC_READY) { |
| 948 | astlpc->kcs_status = status; |
| 949 | return astlpc->binding.start(&astlpc->binding); |
| 950 | } else { |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 951 | mctp_binding_set_tx_enabled(&astlpc->binding, false); |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 952 | } |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 953 | } |
| 954 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 955 | if (astlpc->proto->version == 0 || |
| 956 | updated & KCS_STATUS_CHANNEL_ACTIVE) { |
Andrew Jeffery | 4e8264b | 2020-05-23 20:34:33 +0930 | [diff] [blame] | 957 | bool enable; |
| 958 | |
| 959 | rc = mctp_astlpc_finalise_channel(astlpc); |
| 960 | enable = (status & KCS_STATUS_CHANNEL_ACTIVE) && rc == 0; |
| 961 | |
| 962 | mctp_binding_set_tx_enabled(&astlpc->binding, enable); |
| 963 | } |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 964 | |
| 965 | astlpc->kcs_status = status; |
| 966 | |
| 967 | return rc; |
| 968 | } |
| 969 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 970 | int mctp_astlpc_poll(struct mctp_binding_astlpc *astlpc) |
| 971 | { |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 972 | uint8_t status, data; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 973 | int rc; |
| 974 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 975 | rc = mctp_astlpc_kcs_read(astlpc, MCTP_ASTLPC_KCS_REG_STATUS, &status); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 976 | if (rc) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 977 | astlpc_prwarn(astlpc, "KCS read error"); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 978 | return -1; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 979 | } |
| 980 | |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 981 | astlpc_prdebug(astlpc, "%s: status: 0x%hhx", __func__, status); |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 982 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 983 | if (!mctp_astlpc_kcs_read_ready(astlpc, status)) |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 984 | return 0; |
| 985 | |
Andrew Jeffery | f13cb97 | 2020-05-28 09:30:09 +0930 | [diff] [blame] | 986 | rc = mctp_astlpc_kcs_read(astlpc, MCTP_ASTLPC_KCS_REG_DATA, &data); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 987 | if (rc) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 988 | astlpc_prwarn(astlpc, "KCS data read error"); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 989 | return -1; |
| 990 | } |
| 991 | |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 992 | astlpc_prdebug(astlpc, "%s: data: 0x%hhx", __func__, data); |
Andrew Jeffery | edfe383 | 2020-02-06 11:52:11 +1030 | [diff] [blame] | 993 | |
Andrew Jeffery | 88412be | 2021-03-09 22:05:22 +1030 | [diff] [blame^] | 994 | if (!astlpc->proto->version && !(data == 0x0 || data == 0xff)) { |
Andrew Jeffery | afcb701 | 2021-01-28 17:00:36 +1030 | [diff] [blame] | 995 | astlpc_prwarn(astlpc, "Invalid message for binding state: 0x%x", |
| 996 | data); |
| 997 | return 0; |
| 998 | } |
| 999 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1000 | switch (data) { |
| 1001 | case 0x0: |
| 1002 | mctp_astlpc_init_channel(astlpc); |
| 1003 | break; |
| 1004 | case 0x1: |
| 1005 | mctp_astlpc_rx_start(astlpc); |
| 1006 | break; |
| 1007 | case 0x2: |
| 1008 | mctp_astlpc_tx_complete(astlpc); |
| 1009 | break; |
Jeremy Kerr | 1a4b55a | 2019-06-24 14:22:39 +0800 | [diff] [blame] | 1010 | case 0xff: |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1011 | /* No responsibilities for the BMC on 0xff */ |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 1012 | if (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_HOST) { |
| 1013 | rc = mctp_astlpc_update_channel(astlpc, status); |
| 1014 | if (rc < 0) |
| 1015 | return rc; |
| 1016 | } |
| 1017 | break; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1018 | default: |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1019 | astlpc_prwarn(astlpc, "unknown message 0x%x", data); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1020 | } |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 1021 | |
| 1022 | /* Handle silent loss of bmc-ready */ |
| 1023 | if (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_HOST) { |
| 1024 | if (!(status & KCS_STATUS_BMC_READY && data == 0xff)) |
| 1025 | return mctp_astlpc_update_channel(astlpc, status); |
| 1026 | } |
| 1027 | |
| 1028 | return rc; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1029 | } |
| 1030 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1031 | /* allocate and basic initialisation */ |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1032 | static struct mctp_binding_astlpc *__mctp_astlpc_init(uint8_t mode, |
| 1033 | uint32_t mtu) |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1034 | { |
| 1035 | struct mctp_binding_astlpc *astlpc; |
| 1036 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1037 | assert((mode == MCTP_BINDING_ASTLPC_MODE_BMC) || |
| 1038 | (mode == MCTP_BINDING_ASTLPC_MODE_HOST)); |
| 1039 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1040 | astlpc = __mctp_alloc(sizeof(*astlpc)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1041 | if (!astlpc) |
| 1042 | return NULL; |
| 1043 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1044 | memset(astlpc, 0, sizeof(*astlpc)); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1045 | astlpc->mode = mode; |
| 1046 | astlpc->lpc_map = NULL; |
Andrew Jeffery | a936898 | 2020-06-09 13:07:39 +0930 | [diff] [blame] | 1047 | astlpc->requested_mtu = mtu; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1048 | astlpc->binding.name = "astlpc"; |
| 1049 | astlpc->binding.version = 1; |
Andrew Jeffery | 1a4f441 | 2021-01-28 13:42:02 +1030 | [diff] [blame] | 1050 | astlpc->binding.pkt_size = |
| 1051 | MCTP_PACKET_SIZE(mtu > MCTP_BTU ? mtu : MCTP_BTU); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1052 | astlpc->binding.pkt_pad = 0; |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1053 | astlpc->binding.tx = mctp_binding_astlpc_tx; |
| 1054 | if (mode == MCTP_BINDING_ASTLPC_MODE_BMC) |
| 1055 | astlpc->binding.start = mctp_binding_astlpc_start_bmc; |
| 1056 | else if (mode == MCTP_BINDING_ASTLPC_MODE_HOST) |
| 1057 | astlpc->binding.start = mctp_binding_astlpc_start_host; |
| 1058 | else { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1059 | astlpc_prerr(astlpc, "%s: Invalid mode: %d\n", __func__, mode); |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1060 | __mctp_free(astlpc); |
| 1061 | return NULL; |
| 1062 | } |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1063 | |
| 1064 | return astlpc; |
| 1065 | } |
| 1066 | |
Jeremy Kerr | 3b36d17 | 2019-09-04 11:56:09 +0800 | [diff] [blame] | 1067 | struct mctp_binding *mctp_binding_astlpc_core(struct mctp_binding_astlpc *b) |
| 1068 | { |
| 1069 | return &b->binding; |
| 1070 | } |
| 1071 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1072 | struct mctp_binding_astlpc * |
| 1073 | mctp_astlpc_init(uint8_t mode, uint32_t mtu, void *lpc_map, |
| 1074 | const struct mctp_binding_astlpc_ops *ops, void *ops_data) |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1075 | { |
| 1076 | struct mctp_binding_astlpc *astlpc; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1077 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1078 | if (!(mode == MCTP_BINDING_ASTLPC_MODE_BMC || |
| 1079 | mode == MCTP_BINDING_ASTLPC_MODE_HOST)) { |
| 1080 | mctp_prerr("Unknown binding mode: %u", mode); |
| 1081 | return NULL; |
| 1082 | } |
| 1083 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1084 | astlpc = __mctp_astlpc_init(mode, mtu); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1085 | if (!astlpc) |
| 1086 | return NULL; |
| 1087 | |
| 1088 | memcpy(&astlpc->ops, ops, sizeof(astlpc->ops)); |
| 1089 | astlpc->ops_data = ops_data; |
| 1090 | astlpc->lpc_map = lpc_map; |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1091 | astlpc->mode = mode; |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1092 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1093 | return astlpc; |
| 1094 | } |
| 1095 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1096 | struct mctp_binding_astlpc * |
| 1097 | mctp_astlpc_init_ops(const struct mctp_binding_astlpc_ops *ops, void *ops_data, |
| 1098 | void *lpc_map) |
| 1099 | { |
| 1100 | return mctp_astlpc_init(MCTP_BINDING_ASTLPC_MODE_BMC, MCTP_BTU, lpc_map, |
| 1101 | ops, ops_data); |
| 1102 | } |
| 1103 | |
Andrew Jeffery | 4663f67 | 2020-03-10 23:36:24 +1030 | [diff] [blame] | 1104 | void mctp_astlpc_destroy(struct mctp_binding_astlpc *astlpc) |
| 1105 | { |
Andrew Jeffery | d0f5da0 | 2020-05-28 09:12:55 +0930 | [diff] [blame] | 1106 | /* Clear channel-active and bmc-ready */ |
| 1107 | if (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_BMC) |
| 1108 | mctp_astlpc_kcs_set_status(astlpc, KCS_STATUS_OBF); |
Andrew Jeffery | 4663f67 | 2020-03-10 23:36:24 +1030 | [diff] [blame] | 1109 | __mctp_free(astlpc); |
| 1110 | } |
| 1111 | |
Jeremy Kerr | b214c64 | 2019-11-27 11:34:00 +0800 | [diff] [blame] | 1112 | #ifdef MCTP_HAVE_FILEIO |
Andrew Jeffery | 55fb90b | 2020-05-12 13:54:37 +0930 | [diff] [blame] | 1113 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1114 | static int mctp_astlpc_init_fileio_lpc(struct mctp_binding_astlpc *astlpc) |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1115 | { |
| 1116 | struct aspeed_lpc_ctrl_mapping map = { |
| 1117 | .window_type = ASPEED_LPC_CTRL_WINDOW_MEMORY, |
| 1118 | .window_id = 0, /* There's only one */ |
| 1119 | .flags = 0, |
| 1120 | .addr = 0, |
| 1121 | .offset = 0, |
| 1122 | .size = 0 |
| 1123 | }; |
Andrew Jeffery | 979c6a1 | 2020-05-23 20:04:49 +0930 | [diff] [blame] | 1124 | void *lpc_map_base; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1125 | int fd, rc; |
| 1126 | |
| 1127 | fd = open(lpc_path, O_RDWR | O_SYNC); |
| 1128 | if (fd < 0) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1129 | astlpc_prwarn(astlpc, "LPC open (%s) failed", lpc_path); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1130 | return -1; |
| 1131 | } |
| 1132 | |
| 1133 | rc = ioctl(fd, ASPEED_LPC_CTRL_IOCTL_GET_SIZE, &map); |
| 1134 | if (rc) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1135 | astlpc_prwarn(astlpc, "LPC GET_SIZE failed"); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1136 | close(fd); |
| 1137 | return -1; |
| 1138 | } |
| 1139 | |
Andrew Jeffery | 979c6a1 | 2020-05-23 20:04:49 +0930 | [diff] [blame] | 1140 | lpc_map_base = |
| 1141 | mmap(NULL, map.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| 1142 | if (lpc_map_base == MAP_FAILED) { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1143 | astlpc_prwarn(astlpc, "LPC mmap failed"); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1144 | rc = -1; |
| 1145 | } else { |
Andrew Jeffery | 979c6a1 | 2020-05-23 20:04:49 +0930 | [diff] [blame] | 1146 | astlpc->lpc_map = lpc_map_base + map.size - LPC_WIN_SIZE; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1147 | } |
| 1148 | |
| 1149 | close(fd); |
| 1150 | |
| 1151 | return rc; |
| 1152 | } |
| 1153 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1154 | static int mctp_astlpc_init_fileio_kcs(struct mctp_binding_astlpc *astlpc) |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1155 | { |
| 1156 | astlpc->kcs_fd = open(kcs_path, O_RDWR); |
| 1157 | if (astlpc->kcs_fd < 0) |
| 1158 | return -1; |
| 1159 | |
| 1160 | return 0; |
| 1161 | } |
| 1162 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1163 | static int __mctp_astlpc_fileio_kcs_read(void *arg, |
| 1164 | enum mctp_binding_astlpc_kcs_reg reg, uint8_t *val) |
| 1165 | { |
| 1166 | struct mctp_binding_astlpc *astlpc = arg; |
| 1167 | off_t offset = reg; |
| 1168 | int rc; |
| 1169 | |
| 1170 | rc = pread(astlpc->kcs_fd, val, 1, offset); |
| 1171 | |
| 1172 | return rc == 1 ? 0 : -1; |
| 1173 | } |
| 1174 | |
| 1175 | static int __mctp_astlpc_fileio_kcs_write(void *arg, |
| 1176 | enum mctp_binding_astlpc_kcs_reg reg, uint8_t val) |
| 1177 | { |
| 1178 | struct mctp_binding_astlpc *astlpc = arg; |
| 1179 | off_t offset = reg; |
| 1180 | int rc; |
| 1181 | |
| 1182 | rc = pwrite(astlpc->kcs_fd, &val, 1, offset); |
| 1183 | |
| 1184 | return rc == 1 ? 0 : -1; |
| 1185 | } |
| 1186 | |
| 1187 | int mctp_astlpc_get_fd(struct mctp_binding_astlpc *astlpc) |
| 1188 | { |
| 1189 | return astlpc->kcs_fd; |
| 1190 | } |
| 1191 | |
| 1192 | struct mctp_binding_astlpc *mctp_astlpc_init_fileio(void) |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1193 | { |
| 1194 | struct mctp_binding_astlpc *astlpc; |
| 1195 | int rc; |
| 1196 | |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1197 | /* |
| 1198 | * If we're doing file IO then we're very likely not running |
Andrew Jeffery | 8877c46 | 2020-06-15 12:22:53 +0930 | [diff] [blame] | 1199 | * freestanding, so lets assume that we're on the BMC side. |
| 1200 | * |
| 1201 | * Requesting an MTU of 0 requests the largest possible MTU, whatever |
| 1202 | * value that might take. |
Andrew Jeffery | 7cd72f1 | 2020-05-12 20:27:59 +0930 | [diff] [blame] | 1203 | */ |
Andrew Jeffery | 8877c46 | 2020-06-15 12:22:53 +0930 | [diff] [blame] | 1204 | astlpc = __mctp_astlpc_init(MCTP_BINDING_ASTLPC_MODE_BMC, 0); |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1205 | if (!astlpc) |
| 1206 | return NULL; |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1207 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1208 | /* Set internal operations for kcs. We use direct accesses to the lpc |
| 1209 | * map area */ |
| 1210 | astlpc->ops.kcs_read = __mctp_astlpc_fileio_kcs_read; |
| 1211 | astlpc->ops.kcs_write = __mctp_astlpc_fileio_kcs_write; |
| 1212 | astlpc->ops_data = astlpc; |
| 1213 | |
| 1214 | rc = mctp_astlpc_init_fileio_lpc(astlpc); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1215 | if (rc) { |
| 1216 | free(astlpc); |
| 1217 | return NULL; |
| 1218 | } |
| 1219 | |
Jeremy Kerr | bc53d35 | 2019-08-28 14:26:14 +0530 | [diff] [blame] | 1220 | rc = mctp_astlpc_init_fileio_kcs(astlpc); |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1221 | if (rc) { |
| 1222 | free(astlpc); |
| 1223 | return NULL; |
| 1224 | } |
| 1225 | |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1226 | return astlpc; |
| 1227 | } |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 1228 | #else |
| 1229 | struct mctp_binding_astlpc * __attribute__((const)) |
| 1230 | mctp_astlpc_init_fileio(void) |
| 1231 | { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1232 | astlpc_prerr(astlpc, "Missing support for file IO"); |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 1233 | return NULL; |
| 1234 | } |
Jeremy Kerr | 672c885 | 2019-03-01 12:18:07 +0800 | [diff] [blame] | 1235 | |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 1236 | int __attribute__((const)) mctp_astlpc_get_fd( |
| 1237 | struct mctp_binding_astlpc *astlpc __attribute__((unused))) |
| 1238 | { |
Andrew Jeffery | 9101a2a | 2020-05-22 16:08:03 +0930 | [diff] [blame] | 1239 | astlpc_prerr(astlpc, "Missing support for file IO"); |
Jeremy Kerr | 92a10a6 | 2019-08-28 16:55:54 +0530 | [diff] [blame] | 1240 | return -1; |
| 1241 | } |
| 1242 | #endif |