drivers/gpu/drm/vmwgfx/vmwgfx_msg.c

   1 /*
   2  * Copyright © 2016 VMware, Inc., Palo Alto, CA., USA
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  20  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  21  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  22  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  23  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26
  27
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <asm/hypervisor.h>
  32 #include "drmP.h"
  33 #include "vmwgfx_msg.h"
  34
  35
  36 #define MESSAGE_STATUS_SUCCESS  0x0001
  37 #define MESSAGE_STATUS_DORECV   0x0002
  38 #define MESSAGE_STATUS_CPT      0x0010
  39 #define MESSAGE_STATUS_HB       0x0080
  40
  41 #define RPCI_PROTOCOL_NUM       0x49435052
  42 #define GUESTMSG_FLAG_COOKIE    0x80000000
  43
  44 #define RETRIES                 3
  45
  46 #define VMW_HYPERVISOR_MAGIC    0x564D5868
  47 #define VMW_HYPERVISOR_PORT     0x5658
  48 #define VMW_HYPERVISOR_HB_PORT  0x5659
  49
  50 #define VMW_PORT_CMD_MSG        30
  51 #define VMW_PORT_CMD_HB_MSG     0
  52 #define VMW_PORT_CMD_OPEN_CHANNEL  (MSG_TYPE_OPEN << 16 | VMW_PORT_CMD_MSG)
  53 #define VMW_PORT_CMD_CLOSE_CHANNEL (MSG_TYPE_CLOSE << 16 | VMW_PORT_CMD_MSG)
  54 #define VMW_PORT_CMD_SENDSIZE   (MSG_TYPE_SENDSIZE << 16 | VMW_PORT_CMD_MSG)
  55 #define VMW_PORT_CMD_RECVSIZE   (MSG_TYPE_RECVSIZE << 16 | VMW_PORT_CMD_MSG)
  56 #define VMW_PORT_CMD_RECVSTATUS (MSG_TYPE_RECVSTATUS << 16 | VMW_PORT_CMD_MSG)
  57
  58 #define HIGH_WORD(X) ((X & 0xFFFF0000) >> 16)
  59
  60 static u32 vmw_msg_enabled = 1;
  61
  62 enum rpc_msg_type {
  63         MSG_TYPE_OPEN,
  64         MSG_TYPE_SENDSIZE,
  65         MSG_TYPE_SENDPAYLOAD,
  66         MSG_TYPE_RECVSIZE,
  67         MSG_TYPE_RECVPAYLOAD,
  68         MSG_TYPE_RECVSTATUS,
  69         MSG_TYPE_CLOSE,
  70 };
  71
  72 struct rpc_channel {
  73         u16 channel_id;
  74         u32 cookie_high;
  75         u32 cookie_low;
  76 };
  77
  78
  79
  80 /**
  81  * vmw_open_channel
  82  *
  83  * @channel: RPC channel
  84  * @protocol:
  85  *
  86  * Returns: 0 on success
  87  */
  88 static int vmw_open_channel(struct rpc_channel *channel, unsigned int protocol)
  89 {
  90         unsigned long eax, ebx, ecx, edx, si = 0, di = 0;
  91
  92         VMW_PORT(VMW_PORT_CMD_OPEN_CHANNEL,
  93                 (protocol | GUESTMSG_FLAG_COOKIE), si, di,
  94                 VMW_HYPERVISOR_PORT,
  95                 VMW_HYPERVISOR_MAGIC,
  96                 eax, ebx, ecx, edx, si, di);
  97
  98         if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
  99                 return -EINVAL;
 100
 101         channel->channel_id  = HIGH_WORD(edx);
 102         channel->cookie_high = si;
 103         channel->cookie_low  = di;
 104
 105         return 0;
 106 }
 107
 108
 109
 110 /**
 111  * vmw_close_channel
 112  *
 113  * @channel: RPC channel
 114  *
 115  * Returns: 0 on success
 116  */
 117 static int vmw_close_channel(struct rpc_channel *channel)
 118 {
 119         unsigned long eax, ebx, ecx, edx, si, di;
 120
 121         /* Set up additional parameters */
 122         si  = channel->cookie_high;
 123         di  = channel->cookie_low;
 124
 125         VMW_PORT(VMW_PORT_CMD_CLOSE_CHANNEL,
 126                 0, si, di,
 127                 (VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
 128                 VMW_HYPERVISOR_MAGIC,
 129                 eax, ebx, ecx, edx, si, di);
 130
 131         if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
 132                 return -EINVAL;
 133
 134         return 0;
 135 }
 136
 137
 138
 139 /**
 140  * vmw_send_msg: Sends a message to the host
 141  *
 142  * @channel: RPC channel
 143  * @logmsg: NULL terminated string
 144  *
 145  * Returns: 0 on success
 146  */
 147 static int vmw_send_msg(struct rpc_channel *channel, const char *msg)
 148 {
 149         unsigned long eax, ebx, ecx, edx, si, di, bp;
 150         size_t msg_len = strlen(msg);
 151         int retries = 0;
 152
 153
 154         while (retries < RETRIES) {
 155                 retries++;
 156
 157                 /* Set up additional parameters */
 158                 si  = channel->cookie_high;
 159                 di  = channel->cookie_low;
 160
 161                 VMW_PORT(VMW_PORT_CMD_SENDSIZE,
 162                         msg_len, si, di,
 163                         VMW_HYPERVISOR_PORT | (channel->channel_id << 16),
 164                         VMW_HYPERVISOR_MAGIC,
 165                         eax, ebx, ecx, edx, si, di);
 166
 167                 if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 ||
 168                     (HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
 169                         /* Expected success + high-bandwidth. Give up. */
 170                         return -EINVAL;
 171                 }
 172
 173                 /* Send msg */
 174                 si  = (uintptr_t) msg;
 175                 di  = channel->cookie_low;
 176                 bp  = channel->cookie_high;
 177
 178                 VMW_PORT_HB_OUT(
 179                         (MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG,
 180                         msg_len, si, di,
 181                         VMW_HYPERVISOR_HB_PORT | (channel->channel_id << 16),
 182                         VMW_HYPERVISOR_MAGIC, bp,
 183                         eax, ebx, ecx, edx, si, di);
 184
 185                 if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) != 0) {
 186                         return 0;
 187                 } else if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
 188                         /* A checkpoint occurred. Retry. */
 189                         continue;
 190                 } else {
 191                         break;
 192                 }
 193         }
 194
 195         return -EINVAL;
 196 }
 197
 198
 199
 200 /**
 201  * vmw_recv_msg: Receives a message from the host
 202  *
 203  * Note:  It is the caller's responsibility to call kfree() on msg.
 204  *
 205  * @channel:  channel opened by vmw_open_channel
 206  * @msg:  [OUT] message received from the host
 207  * @msg_len: message length
 208  */
 209 static int vmw_recv_msg(struct rpc_channel *channel, void **msg,
 210                         size_t *msg_len)
 211 {
 212         unsigned long eax, ebx, ecx, edx, si, di, bp;
 213         char *reply;
 214         size_t reply_len;
 215         int retries = 0;
 216
 217
 218         *msg_len = 0;
 219         *msg = NULL;
 220
 221         while (retries < RETRIES) {
 222                 retries++;
 223
 224                 /* Set up additional parameters */
 225                 si  = channel->cookie_high;
 226                 di  = channel->cookie_low;
 227
 228                 VMW_PORT(VMW_PORT_CMD_RECVSIZE,
 229                         0, si, di,
 230                         (VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
 231                         VMW_HYPERVISOR_MAGIC,
 232                         eax, ebx, ecx, edx, si, di);
 233
 234                 if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 ||
 235                     (HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
 236                         DRM_ERROR("Failed to get reply size\n");
 237                         return -EINVAL;
 238                 }
 239
 240                 /* No reply available.  This is okay. */
 241                 if ((HIGH_WORD(ecx) & MESSAGE_STATUS_DORECV) == 0)
 242                         return 0;
 243
 244                 reply_len = ebx;
 245                 reply     = kzalloc(reply_len + 1, GFP_KERNEL);
 246                 if (reply == NULL) {
 247                         DRM_ERROR("Cannot allocate memory for reply\n");
 248                         return -ENOMEM;
 249                 }
 250
 251
 252                 /* Receive buffer */
 253                 si  = channel->cookie_high;
 254                 di  = (uintptr_t) reply;
 255                 bp  = channel->cookie_low;
 256
 257                 VMW_PORT_HB_IN(
 258                         (MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG,
 259                         reply_len, si, di,
 260                         VMW_HYPERVISOR_HB_PORT | (channel->channel_id << 16),
 261                         VMW_HYPERVISOR_MAGIC, bp,
 262                         eax, ebx, ecx, edx, si, di);
 263
 264                 if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) == 0) {
 265                         kfree(reply);
 266
 267                         if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
 268                                 /* A checkpoint occurred. Retry. */
 269                                 continue;
 270                         }
 271
 272                         return -EINVAL;
 273                 }
 274
 275                 reply[reply_len] = '\0';
 276
 277
 278                 /* Ack buffer */
 279                 si  = channel->cookie_high;
 280                 di  = channel->cookie_low;
 281
 282                 VMW_PORT(VMW_PORT_CMD_RECVSTATUS,
 283                         MESSAGE_STATUS_SUCCESS, si, di,
 284                         (VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
 285                         VMW_HYPERVISOR_MAGIC,
 286                         eax, ebx, ecx, edx, si, di);
 287
 288                 if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) {
 289                         kfree(reply);
 290
 291                         if ((HIGH_WORD(ecx) & MESSAGE_STATUS_CPT) != 0) {
 292                                 /* A checkpoint occurred. Retry. */
 293                                 continue;
 294                         }
 295
 296                         return -EINVAL;
 297                 }
 298
 299                 break;
 300         }
 301
 302         *msg_len = reply_len;
 303         *msg     = reply;
 304
 305         return 0;
 306 }
 307
 308
 309 /**
 310  * vmw_host_get_guestinfo: Gets a GuestInfo parameter
 311  *
 312  * Gets the value of a  GuestInfo.* parameter.  The value returned will be in
 313  * a string, and it is up to the caller to post-process.
 314  *
 315  * @guest_info_param:  Parameter to get, e.g. GuestInfo.svga.gl3
 316  * @buffer: if NULL, *reply_len will contain reply size.
 317  * @length: size of the reply_buf.  Set to size of reply upon return
 318  *
 319  * Returns: 0 on success
 320  */
 321 int vmw_host_get_guestinfo(const char *guest_info_param,
 322                            char *buffer, size_t *length)
 323 {
 324         struct rpc_channel channel;
 325         char *msg, *reply = NULL;
 326         size_t msg_len, reply_len = 0;
 327         int ret = 0;
 328
 329
 330         if (!vmw_msg_enabled)
 331                 return -ENODEV;
 332
 333         if (!guest_info_param || !length)
 334                 return -EINVAL;
 335
 336         msg_len = strlen(guest_info_param) + strlen("info-get ") + 1;
 337         msg = kzalloc(msg_len, GFP_KERNEL);
 338         if (msg == NULL) {
 339                 DRM_ERROR("Cannot allocate memory to get %s", guest_info_param);
 340                 return -ENOMEM;
 341         }
 342
 343         sprintf(msg, "info-get %s", guest_info_param);
 344
 345         if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM) ||
 346             vmw_send_msg(&channel, msg) ||
 347             vmw_recv_msg(&channel, (void *) &reply, &reply_len) ||
 348             vmw_close_channel(&channel)) {
 349                 DRM_ERROR("Failed to get %s", guest_info_param);
 350
 351                 ret = -EINVAL;
 352         }
 353
 354         if (buffer && reply && reply_len > 0) {
 355                 /* Remove reply code, which are the first 2 characters of
 356                  * the reply
 357                  */
 358                 reply_len = max(reply_len - 2, (size_t) 0);
 359                 reply_len = min(reply_len, *length);
 360
 361                 if (reply_len > 0)
 362                         memcpy(buffer, reply + 2, reply_len);
 363         }
 364
 365         *length = reply_len;
 366
 367         kfree(reply);
 368         kfree(msg);
 369
 370         return ret;
 371 }
 372
 373
 374
 375 /**
 376  * vmw_host_log: Sends a log message to the host
 377  *
 378  * @log: NULL terminated string
 379  *
 380  * Returns: 0 on success
 381  */
 382 int vmw_host_log(const char *log)
 383 {
 384         struct rpc_channel channel;
 385         char *msg;
 386         int msg_len;
 387         int ret = 0;
 388
 389
 390         if (!vmw_msg_enabled)
 391                 return -ENODEV;
 392
 393         if (!log)
 394                 return ret;
 395
 396         msg_len = strlen(log) + strlen("log ") + 1;
 397         msg = kzalloc(msg_len, GFP_KERNEL);
 398         if (msg == NULL) {
 399                 DRM_ERROR("Cannot allocate memory for log message\n");
 400                 return -ENOMEM;
 401         }
 402
 403         sprintf(msg, "log %s", log);
 404
 405         if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM) ||
 406             vmw_send_msg(&channel, msg) ||
 407             vmw_close_channel(&channel)) {
 408                 DRM_ERROR("Failed to send log\n");
 409
 410                 ret = -EINVAL;
 411         }
 412
 413         kfree(msg);
 414
 415         return ret;
 416 }