drivers/gpu/drm/savage/savage_bci.c

   1 /* savage_bci.c -- BCI support for Savage
   2  *
   3  * Copyright 2004  Felix Kuehling
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to 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,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NON-INFRINGEMENT. IN NO EVENT SHALL FELIX KUEHLING BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  22  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25 #include <drm/drmP.h>
  26 #include <drm/savage_drm.h>
  27 #include "savage_drv.h"
  28
  29 /* Need a long timeout for shadow status updates can take a while
  30  * and so can waiting for events when the queue is full. */
  31 #define SAVAGE_DEFAULT_USEC_TIMEOUT     1000000 /* 1s */
  32 #define SAVAGE_EVENT_USEC_TIMEOUT       5000000 /* 5s */
  33 #define SAVAGE_FREELIST_DEBUG           0
  34
  35 static int savage_do_cleanup_bci(struct drm_device *dev);
  36
  37 static int
  38 savage_bci_wait_fifo_shadow(drm_savage_private_t * dev_priv, unsigned int n)
  39 {
  40         uint32_t mask = dev_priv->status_used_mask;
  41         uint32_t threshold = dev_priv->bci_threshold_hi;
  42         uint32_t status;
  43         int i;
  44
  45 #if SAVAGE_BCI_DEBUG
  46         if (n > dev_priv->cob_size + SAVAGE_BCI_FIFO_SIZE - threshold)
  47                 DRM_ERROR("Trying to emit %d words "
  48                           "(more than guaranteed space in COB)\n", n);
  49 #endif
  50
  51         for (i = 0; i < SAVAGE_DEFAULT_USEC_TIMEOUT; i++) {
  52                 mb();
  53                 status = dev_priv->status_ptr[0];
  54                 if ((status & mask) < threshold)
  55                         return 0;
  56                 DRM_UDELAY(1);
  57         }
  58
  59 #if SAVAGE_BCI_DEBUG
  60         DRM_ERROR("failed!\n");
  61         DRM_INFO("   status=0x%08x, threshold=0x%08x\n", status, threshold);
  62 #endif
  63         return -EBUSY;
  64 }
  65
  66 static int
  67 savage_bci_wait_fifo_s3d(drm_savage_private_t * dev_priv, unsigned int n)
  68 {
  69         uint32_t maxUsed = dev_priv->cob_size + SAVAGE_BCI_FIFO_SIZE - n;
  70         uint32_t status;
  71         int i;
  72
  73         for (i = 0; i < SAVAGE_DEFAULT_USEC_TIMEOUT; i++) {
  74                 status = SAVAGE_READ(SAVAGE_STATUS_WORD0);
  75                 if ((status & SAVAGE_FIFO_USED_MASK_S3D) <= maxUsed)
  76                         return 0;
  77                 DRM_UDELAY(1);
  78         }
  79
  80 #if SAVAGE_BCI_DEBUG
  81         DRM_ERROR("failed!\n");
  82         DRM_INFO("   status=0x%08x\n", status);
  83 #endif
  84         return -EBUSY;
  85 }
  86
  87 static int
  88 savage_bci_wait_fifo_s4(drm_savage_private_t * dev_priv, unsigned int n)
  89 {
  90         uint32_t maxUsed = dev_priv->cob_size + SAVAGE_BCI_FIFO_SIZE - n;
  91         uint32_t status;
  92         int i;
  93
  94         for (i = 0; i < SAVAGE_DEFAULT_USEC_TIMEOUT; i++) {
  95                 status = SAVAGE_READ(SAVAGE_ALT_STATUS_WORD0);
  96                 if ((status & SAVAGE_FIFO_USED_MASK_S4) <= maxUsed)
  97                         return 0;
  98                 DRM_UDELAY(1);
  99         }
 100
 101 #if SAVAGE_BCI_DEBUG
 102         DRM_ERROR("failed!\n");
 103         DRM_INFO("   status=0x%08x\n", status);
 104 #endif
 105         return -EBUSY;
 106 }
 107
 108 /*
 109  * Waiting for events.
 110  *
 111  * The BIOSresets the event tag to 0 on mode changes. Therefore we
 112  * never emit 0 to the event tag. If we find a 0 event tag we know the
 113  * BIOS stomped on it and return success assuming that the BIOS waited
 114  * for engine idle.
 115  *
 116  * Note: if the Xserver uses the event tag it has to follow the same
 117  * rule. Otherwise there may be glitches every 2^16 events.
 118  */
 119 static int
 120 savage_bci_wait_event_shadow(drm_savage_private_t * dev_priv, uint16_t e)
 121 {
 122         uint32_t status;
 123         int i;
 124
 125         for (i = 0; i < SAVAGE_EVENT_USEC_TIMEOUT; i++) {
 126                 mb();
 127                 status = dev_priv->status_ptr[1];
 128                 if ((((status & 0xffff) - e) & 0xffff) <= 0x7fff ||
 129                     (status & 0xffff) == 0)
 130                         return 0;
 131                 DRM_UDELAY(1);
 132         }
 133
 134 #if SAVAGE_BCI_DEBUG
 135         DRM_ERROR("failed!\n");
 136         DRM_INFO("   status=0x%08x, e=0x%04x\n", status, e);
 137 #endif
 138
 139         return -EBUSY;
 140 }
 141
 142 static int
 143 savage_bci_wait_event_reg(drm_savage_private_t * dev_priv, uint16_t e)
 144 {
 145         uint32_t status;
 146         int i;
 147
 148         for (i = 0; i < SAVAGE_EVENT_USEC_TIMEOUT; i++) {
 149                 status = SAVAGE_READ(SAVAGE_STATUS_WORD1);
 150                 if ((((status & 0xffff) - e) & 0xffff) <= 0x7fff ||
 151                     (status & 0xffff) == 0)
 152                         return 0;
 153                 DRM_UDELAY(1);
 154         }
 155
 156 #if SAVAGE_BCI_DEBUG
 157         DRM_ERROR("failed!\n");
 158         DRM_INFO("   status=0x%08x, e=0x%04x\n", status, e);
 159 #endif
 160
 161         return -EBUSY;
 162 }
 163
 164 uint16_t savage_bci_emit_event(drm_savage_private_t * dev_priv,
 165                                unsigned int flags)
 166 {
 167         uint16_t count;
 168         BCI_LOCALS;
 169
 170         if (dev_priv->status_ptr) {
 171                 /* coordinate with Xserver */
 172                 count = dev_priv->status_ptr[1023];
 173                 if (count < dev_priv->event_counter)
 174                         dev_priv->event_wrap++;
 175         } else {
 176                 count = dev_priv->event_counter;
 177         }
 178         count = (count + 1) & 0xffff;
 179         if (count == 0) {
 180                 count++;        /* See the comment above savage_wait_event_*. */
 181                 dev_priv->event_wrap++;
 182         }
 183         dev_priv->event_counter = count;
 184         if (dev_priv->status_ptr)
 185                 dev_priv->status_ptr[1023] = (uint32_t) count;
 186
 187         if ((flags & (SAVAGE_WAIT_2D | SAVAGE_WAIT_3D))) {
 188                 unsigned int wait_cmd = BCI_CMD_WAIT;
 189                 if ((flags & SAVAGE_WAIT_2D))
 190                         wait_cmd |= BCI_CMD_WAIT_2D;
 191                 if ((flags & SAVAGE_WAIT_3D))
 192                         wait_cmd |= BCI_CMD_WAIT_3D;
 193                 BEGIN_BCI(2);
 194                 BCI_WRITE(wait_cmd);
 195         } else {
 196                 BEGIN_BCI(1);
 197         }
 198         BCI_WRITE(BCI_CMD_UPDATE_EVENT_TAG | (uint32_t) count);
 199
 200         return count;
 201 }
 202
 203 /*
 204  * Freelist management
 205  */
 206 static int savage_freelist_init(struct drm_device * dev)
 207 {
 208         drm_savage_private_t *dev_priv = dev->dev_private;
 209         struct drm_device_dma *dma = dev->dma;
 210         struct drm_buf *buf;
 211         drm_savage_buf_priv_t *entry;
 212         int i;
 213         DRM_DEBUG("count=%d\n", dma->buf_count);
 214
 215         dev_priv->head.next = &dev_priv->tail;
 216         dev_priv->head.prev = NULL;
 217         dev_priv->head.buf = NULL;
 218
 219         dev_priv->tail.next = NULL;
 220         dev_priv->tail.prev = &dev_priv->head;
 221         dev_priv->tail.buf = NULL;
 222
 223         for (i = 0; i < dma->buf_count; i++) {
 224                 buf = dma->buflist[i];
 225                 entry = buf->dev_private;
 226
 227                 SET_AGE(&entry->age, 0, 0);
 228                 entry->buf = buf;
 229
 230                 entry->next = dev_priv->head.next;
 231                 entry->prev = &dev_priv->head;
 232                 dev_priv->head.next->prev = entry;
 233                 dev_priv->head.next = entry;
 234         }
 235
 236         return 0;
 237 }
 238
 239 static struct drm_buf *savage_freelist_get(struct drm_device * dev)
 240 {
 241         drm_savage_private_t *dev_priv = dev->dev_private;
 242         drm_savage_buf_priv_t *tail = dev_priv->tail.prev;
 243         uint16_t event;
 244         unsigned int wrap;
 245         DRM_DEBUG("\n");
 246
 247         UPDATE_EVENT_COUNTER();
 248         if (dev_priv->status_ptr)
 249                 event = dev_priv->status_ptr[1] & 0xffff;
 250         else
 251                 event = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
 252         wrap = dev_priv->event_wrap;
 253         if (event > dev_priv->event_counter)
 254                 wrap--;         /* hardware hasn't passed the last wrap yet */
 255
 256         DRM_DEBUG("   tail=0x%04x %d\n", tail->age.event, tail->age.wrap);
 257         DRM_DEBUG("   head=0x%04x %d\n", event, wrap);
 258
 259         if (tail->buf && (TEST_AGE(&tail->age, event, wrap) || event == 0)) {
 260                 drm_savage_buf_priv_t *next = tail->next;
 261                 drm_savage_buf_priv_t *prev = tail->prev;
 262                 prev->next = next;
 263                 next->prev = prev;
 264                 tail->next = tail->prev = NULL;
 265                 return tail->buf;
 266         }
 267
 268         DRM_DEBUG("returning NULL, tail->buf=%p!\n", tail->buf);
 269         return NULL;
 270 }
 271
 272 void savage_freelist_put(struct drm_device * dev, struct drm_buf * buf)
 273 {
 274         drm_savage_private_t *dev_priv = dev->dev_private;
 275         drm_savage_buf_priv_t *entry = buf->dev_private, *prev, *next;
 276
 277         DRM_DEBUG("age=0x%04x wrap=%d\n", entry->age.event, entry->age.wrap);
 278
 279         if (entry->next != NULL || entry->prev != NULL) {
 280                 DRM_ERROR("entry already on freelist.\n");
 281                 return;
 282         }
 283
 284         prev = &dev_priv->head;
 285         next = prev->next;
 286         prev->next = entry;
 287         next->prev = entry;
 288         entry->prev = prev;
 289         entry->next = next;
 290 }
 291
 292 /*
 293  * Command DMA
 294  */
 295 static int savage_dma_init(drm_savage_private_t * dev_priv)
 296 {
 297         unsigned int i;
 298
 299         dev_priv->nr_dma_pages = dev_priv->cmd_dma->size /
 300             (SAVAGE_DMA_PAGE_SIZE * 4);
 301         dev_priv->dma_pages = kmalloc(sizeof(drm_savage_dma_page_t) *
 302                                       dev_priv->nr_dma_pages, GFP_KERNEL);
 303         if (dev_priv->dma_pages == NULL)
 304                 return -ENOMEM;
 305
 306         for (i = 0; i < dev_priv->nr_dma_pages; ++i) {
 307                 SET_AGE(&dev_priv->dma_pages[i].age, 0, 0);
 308                 dev_priv->dma_pages[i].used = 0;
 309                 dev_priv->dma_pages[i].flushed = 0;
 310         }
 311         SET_AGE(&dev_priv->last_dma_age, 0, 0);
 312
 313         dev_priv->first_dma_page = 0;
 314         dev_priv->current_dma_page = 0;
 315
 316         return 0;
 317 }
 318
 319 void savage_dma_reset(drm_savage_private_t * dev_priv)
 320 {
 321         uint16_t event;
 322         unsigned int wrap, i;
 323         event = savage_bci_emit_event(dev_priv, 0);
 324         wrap = dev_priv->event_wrap;
 325         for (i = 0; i < dev_priv->nr_dma_pages; ++i) {
 326                 SET_AGE(&dev_priv->dma_pages[i].age, event, wrap);
 327                 dev_priv->dma_pages[i].used = 0;
 328                 dev_priv->dma_pages[i].flushed = 0;
 329         }
 330         SET_AGE(&dev_priv->last_dma_age, event, wrap);
 331         dev_priv->first_dma_page = dev_priv->current_dma_page = 0;
 332 }
 333
 334 void savage_dma_wait(drm_savage_private_t * dev_priv, unsigned int page)
 335 {
 336         uint16_t event;
 337         unsigned int wrap;
 338
 339         /* Faked DMA buffer pages don't age. */
 340         if (dev_priv->cmd_dma == &dev_priv->fake_dma)
 341                 return;
 342
 343         UPDATE_EVENT_COUNTER();
 344         if (dev_priv->status_ptr)
 345                 event = dev_priv->status_ptr[1] & 0xffff;
 346         else
 347                 event = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
 348         wrap = dev_priv->event_wrap;
 349         if (event > dev_priv->event_counter)
 350                 wrap--;         /* hardware hasn't passed the last wrap yet */
 351
 352         if (dev_priv->dma_pages[page].age.wrap > wrap ||
 353             (dev_priv->dma_pages[page].age.wrap == wrap &&
 354              dev_priv->dma_pages[page].age.event > event)) {
 355                 if (dev_priv->wait_evnt(dev_priv,
 356                                         dev_priv->dma_pages[page].age.event)
 357                     < 0)
 358                         DRM_ERROR("wait_evnt failed!\n");
 359         }
 360 }
 361
 362 uint32_t *savage_dma_alloc(drm_savage_private_t * dev_priv, unsigned int n)
 363 {
 364         unsigned int cur = dev_priv->current_dma_page;
 365         unsigned int rest = SAVAGE_DMA_PAGE_SIZE -
 366             dev_priv->dma_pages[cur].used;
 367         unsigned int nr_pages = (n - rest + SAVAGE_DMA_PAGE_SIZE - 1) /
 368             SAVAGE_DMA_PAGE_SIZE;
 369         uint32_t *dma_ptr;
 370         unsigned int i;
 371
 372         DRM_DEBUG("cur=%u, cur->used=%u, n=%u, rest=%u, nr_pages=%u\n",
 373                   cur, dev_priv->dma_pages[cur].used, n, rest, nr_pages);
 374
 375         if (cur + nr_pages < dev_priv->nr_dma_pages) {
 376                 dma_ptr = (uint32_t *) dev_priv->cmd_dma->handle +
 377                     cur * SAVAGE_DMA_PAGE_SIZE + dev_priv->dma_pages[cur].used;
 378                 if (n < rest)
 379                         rest = n;
 380                 dev_priv->dma_pages[cur].used += rest;
 381                 n -= rest;
 382                 cur++;
 383         } else {
 384                 dev_priv->dma_flush(dev_priv);
 385                 nr_pages =
 386                     (n + SAVAGE_DMA_PAGE_SIZE - 1) / SAVAGE_DMA_PAGE_SIZE;
 387                 for (i = cur; i < dev_priv->nr_dma_pages; ++i) {
 388                         dev_priv->dma_pages[i].age = dev_priv->last_dma_age;
 389                         dev_priv->dma_pages[i].used = 0;
 390                         dev_priv->dma_pages[i].flushed = 0;
 391                 }
 392                 dma_ptr = (uint32_t *) dev_priv->cmd_dma->handle;
 393                 dev_priv->first_dma_page = cur = 0;
 394         }
 395         for (i = cur; nr_pages > 0; ++i, --nr_pages) {
 396 #if SAVAGE_DMA_DEBUG
 397                 if (dev_priv->dma_pages[i].used) {
 398                         DRM_ERROR("unflushed page %u: used=%u\n",
 399                                   i, dev_priv->dma_pages[i].used);
 400                 }
 401 #endif
 402                 if (n > SAVAGE_DMA_PAGE_SIZE)
 403                         dev_priv->dma_pages[i].used = SAVAGE_DMA_PAGE_SIZE;
 404                 else
 405                         dev_priv->dma_pages[i].used = n;
 406                 n -= SAVAGE_DMA_PAGE_SIZE;
 407         }
 408         dev_priv->current_dma_page = --i;
 409
 410         DRM_DEBUG("cur=%u, cur->used=%u, n=%u\n",
 411                   i, dev_priv->dma_pages[i].used, n);
 412
 413         savage_dma_wait(dev_priv, dev_priv->current_dma_page);
 414
 415         return dma_ptr;
 416 }
 417
 418 static void savage_dma_flush(drm_savage_private_t * dev_priv)
 419 {
 420         unsigned int first = dev_priv->first_dma_page;
 421         unsigned int cur = dev_priv->current_dma_page;
 422         uint16_t event;
 423         unsigned int wrap, pad, align, len, i;
 424         unsigned long phys_addr;
 425         BCI_LOCALS;
 426
 427         if (first == cur &&
 428             dev_priv->dma_pages[cur].used == dev_priv->dma_pages[cur].flushed)
 429                 return;
 430
 431         /* pad length to multiples of 2 entries
 432          * align start of next DMA block to multiles of 8 entries */
 433         pad = -dev_priv->dma_pages[cur].used & 1;
 434         align = -(dev_priv->dma_pages[cur].used + pad) & 7;
 435
 436         DRM_DEBUG("first=%u, cur=%u, first->flushed=%u, cur->used=%u, "
 437                   "pad=%u, align=%u\n",
 438                   first, cur, dev_priv->dma_pages[first].flushed,
 439                   dev_priv->dma_pages[cur].used, pad, align);
 440
 441         /* pad with noops */
 442         if (pad) {
 443                 uint32_t *dma_ptr = (uint32_t *) dev_priv->cmd_dma->handle +
 444                     cur * SAVAGE_DMA_PAGE_SIZE + dev_priv->dma_pages[cur].used;
 445                 dev_priv->dma_pages[cur].used += pad;
 446                 while (pad != 0) {
 447                         *dma_ptr++ = BCI_CMD_WAIT;
 448                         pad--;
 449                 }
 450         }
 451
 452         mb();
 453
 454         /* do flush ... */
 455         phys_addr = dev_priv->cmd_dma->offset +
 456             (first * SAVAGE_DMA_PAGE_SIZE +
 457              dev_priv->dma_pages[first].flushed) * 4;
 458         len = (cur - first) * SAVAGE_DMA_PAGE_SIZE +
 459             dev_priv->dma_pages[cur].used - dev_priv->dma_pages[first].flushed;
 460
 461         DRM_DEBUG("phys_addr=%lx, len=%u\n",
 462                   phys_addr | dev_priv->dma_type, len);
 463
 464         BEGIN_BCI(3);
 465         BCI_SET_REGISTERS(SAVAGE_DMABUFADDR, 1);
 466         BCI_WRITE(phys_addr | dev_priv->dma_type);
 467         BCI_DMA(len);
 468
 469         /* fix alignment of the start of the next block */
 470         dev_priv->dma_pages[cur].used += align;
 471
 472         /* age DMA pages */
 473         event = savage_bci_emit_event(dev_priv, 0);
 474         wrap = dev_priv->event_wrap;
 475         for (i = first; i < cur; ++i) {
 476                 SET_AGE(&dev_priv->dma_pages[i].age, event, wrap);
 477                 dev_priv->dma_pages[i].used = 0;
 478                 dev_priv->dma_pages[i].flushed = 0;
 479         }
 480         /* age the current page only when it's full */
 481         if (dev_priv->dma_pages[cur].used == SAVAGE_DMA_PAGE_SIZE) {
 482                 SET_AGE(&dev_priv->dma_pages[cur].age, event, wrap);
 483                 dev_priv->dma_pages[cur].used = 0;
 484                 dev_priv->dma_pages[cur].flushed = 0;
 485                 /* advance to next page */
 486                 cur++;
 487                 if (cur == dev_priv->nr_dma_pages)
 488                         cur = 0;
 489                 dev_priv->first_dma_page = dev_priv->current_dma_page = cur;
 490         } else {
 491                 dev_priv->first_dma_page = cur;
 492                 dev_priv->dma_pages[cur].flushed = dev_priv->dma_pages[i].used;
 493         }
 494         SET_AGE(&dev_priv->last_dma_age, event, wrap);
 495
 496         DRM_DEBUG("first=cur=%u, cur->used=%u, cur->flushed=%u\n", cur,
 497                   dev_priv->dma_pages[cur].used,
 498                   dev_priv->dma_pages[cur].flushed);
 499 }
 500
 501 static void savage_fake_dma_flush(drm_savage_private_t * dev_priv)
 502 {
 503         unsigned int i, j;
 504         BCI_LOCALS;
 505
 506         if (dev_priv->first_dma_page == dev_priv->current_dma_page &&
 507             dev_priv->dma_pages[dev_priv->current_dma_page].used == 0)
 508                 return;
 509
 510         DRM_DEBUG("first=%u, cur=%u, cur->used=%u\n",
 511                   dev_priv->first_dma_page, dev_priv->current_dma_page,
 512                   dev_priv->dma_pages[dev_priv->current_dma_page].used);
 513
 514         for (i = dev_priv->first_dma_page;
 515              i <= dev_priv->current_dma_page && dev_priv->dma_pages[i].used;
 516              ++i) {
 517                 uint32_t *dma_ptr = (uint32_t *) dev_priv->cmd_dma->handle +
 518                     i * SAVAGE_DMA_PAGE_SIZE;
 519 #if SAVAGE_DMA_DEBUG
 520                 /* Sanity check: all pages except the last one must be full. */
 521                 if (i < dev_priv->current_dma_page &&
 522                     dev_priv->dma_pages[i].used != SAVAGE_DMA_PAGE_SIZE) {
 523                         DRM_ERROR("partial DMA page %u: used=%u",
 524                                   i, dev_priv->dma_pages[i].used);
 525                 }
 526 #endif
 527                 BEGIN_BCI(dev_priv->dma_pages[i].used);
 528                 for (j = 0; j < dev_priv->dma_pages[i].used; ++j) {
 529                         BCI_WRITE(dma_ptr[j]);
 530                 }
 531                 dev_priv->dma_pages[i].used = 0;
 532         }
 533
 534         /* reset to first page */
 535         dev_priv->first_dma_page = dev_priv->current_dma_page = 0;
 536 }
 537
 538 int savage_driver_load(struct drm_device *dev, unsigned long chipset)
 539 {
 540         drm_savage_private_t *dev_priv;
 541
 542         dev_priv = kzalloc(sizeof(drm_savage_private_t), GFP_KERNEL);
 543         if (dev_priv == NULL)
 544                 return -ENOMEM;
 545
 546         dev->dev_private = (void *)dev_priv;
 547
 548         dev_priv->chipset = (enum savage_family)chipset;
 549
 550         pci_set_master(dev->pdev);
 551
 552         return 0;
 553 }
 554
 555
 556 /*
 557  * Initialize mappings. On Savage4 and SavageIX the alignment
 558  * and size of the aperture is not suitable for automatic MTRR setup
 559  * in drm_legacy_addmap. Therefore we add them manually before the maps are
 560  * initialized, and tear them down on last close.
 561  */
 562 int savage_driver_firstopen(struct drm_device *dev)
 563 {
 564         drm_savage_private_t *dev_priv = dev->dev_private;
 565         unsigned long mmio_base, fb_base, fb_size, aperture_base;
 566         /* fb_rsrc and aper_rsrc aren't really used currently, but still exist
 567          * in case we decide we need information on the BAR for BSD in the
 568          * future.
 569          */
 570         unsigned int fb_rsrc, aper_rsrc;
 571         int ret = 0;
 572
 573         if (S3_SAVAGE3D_SERIES(dev_priv->chipset)) {
 574                 fb_rsrc = 0;
 575                 fb_base = pci_resource_start(dev->pdev, 0);
 576                 fb_size = SAVAGE_FB_SIZE_S3;
 577                 mmio_base = fb_base + SAVAGE_FB_SIZE_S3;
 578                 aper_rsrc = 0;
 579                 aperture_base = fb_base + SAVAGE_APERTURE_OFFSET;
 580                 /* this should always be true */
 581                 if (pci_resource_len(dev->pdev, 0) == 0x08000000) {
 582                         /* Don't make MMIO write-cobining! We need 3
 583                          * MTRRs. */
 584                         dev_priv->mtrr_handles[0] =
 585                                 arch_phys_wc_add(fb_base, 0x01000000);
 586                         dev_priv->mtrr_handles[1] =
 587                                 arch_phys_wc_add(fb_base + 0x02000000,
 588                                                  0x02000000);
 589                         dev_priv->mtrr_handles[2] =
 590                                 arch_phys_wc_add(fb_base + 0x04000000,
 591                                                 0x04000000);
 592                 } else {
 593                         DRM_ERROR("strange pci_resource_len %08llx\n",
 594                                   (unsigned long long)
 595                                   pci_resource_len(dev->pdev, 0));
 596                 }
 597         } else if (dev_priv->chipset != S3_SUPERSAVAGE &&
 598                    dev_priv->chipset != S3_SAVAGE2000) {
 599                 mmio_base = pci_resource_start(dev->pdev, 0);
 600                 fb_rsrc = 1;
 601                 fb_base = pci_resource_start(dev->pdev, 1);
 602                 fb_size = SAVAGE_FB_SIZE_S4;
 603                 aper_rsrc = 1;
 604                 aperture_base = fb_base + SAVAGE_APERTURE_OFFSET;
 605                 /* this should always be true */
 606                 if (pci_resource_len(dev->pdev, 1) == 0x08000000) {
 607                         /* Can use one MTRR to cover both fb and
 608                          * aperture. */
 609                         dev_priv->mtrr_handles[0] =
 610                                 arch_phys_wc_add(fb_base,
 611                                                  0x08000000);
 612                 } else {
 613                         DRM_ERROR("strange pci_resource_len %08llx\n",
 614                                   (unsigned long long)
 615                                   pci_resource_len(dev->pdev, 1));
 616                 }
 617         } else {
 618                 mmio_base = pci_resource_start(dev->pdev, 0);
 619                 fb_rsrc = 1;
 620                 fb_base = pci_resource_start(dev->pdev, 1);
 621                 fb_size = pci_resource_len(dev->pdev, 1);
 622                 aper_rsrc = 2;
 623                 aperture_base = pci_resource_start(dev->pdev, 2);
 624                 /* Automatic MTRR setup will do the right thing. */
 625         }
 626
 627         ret = drm_legacy_addmap(dev, mmio_base, SAVAGE_MMIO_SIZE,
 628                                 _DRM_REGISTERS, _DRM_READ_ONLY,
 629                                 &dev_priv->mmio);
 630         if (ret)
 631                 return ret;
 632
 633         ret = drm_legacy_addmap(dev, fb_base, fb_size, _DRM_FRAME_BUFFER,
 634                                 _DRM_WRITE_COMBINING, &dev_priv->fb);
 635         if (ret)
 636                 return ret;
 637
 638         ret = drm_legacy_addmap(dev, aperture_base, SAVAGE_APERTURE_SIZE,
 639                                 _DRM_FRAME_BUFFER, _DRM_WRITE_COMBINING,
 640                                 &dev_priv->aperture);
 641         return ret;
 642 }
 643
 644 /*
 645  * Delete MTRRs and free device-private data.
 646  */
 647 void savage_driver_lastclose(struct drm_device *dev)
 648 {
 649         drm_savage_private_t *dev_priv = dev->dev_private;
 650         int i;
 651
 652         for (i = 0; i < 3; ++i) {
 653                 arch_phys_wc_del(dev_priv->mtrr_handles[i]);
 654                 dev_priv->mtrr_handles[i] = 0;
 655         }
 656 }
 657
 658 void savage_driver_unload(struct drm_device *dev)
 659 {
 660         drm_savage_private_t *dev_priv = dev->dev_private;
 661
 662         kfree(dev_priv);
 663 }
 664
 665 static int savage_do_init_bci(struct drm_device * dev, drm_savage_init_t * init)
 666 {
 667         drm_savage_private_t *dev_priv = dev->dev_private;
 668
 669         if (init->fb_bpp != 16 && init->fb_bpp != 32) {
 670                 DRM_ERROR("invalid frame buffer bpp %d!\n", init->fb_bpp);
 671                 return -EINVAL;
 672         }
 673         if (init->depth_bpp != 16 && init->depth_bpp != 32) {
 674                 DRM_ERROR("invalid depth buffer bpp %d!\n", init->fb_bpp);
 675                 return -EINVAL;
 676         }
 677         if (init->dma_type != SAVAGE_DMA_AGP &&
 678             init->dma_type != SAVAGE_DMA_PCI) {
 679                 DRM_ERROR("invalid dma memory type %d!\n", init->dma_type);
 680                 return -EINVAL;
 681         }
 682
 683         dev_priv->cob_size = init->cob_size;
 684         dev_priv->bci_threshold_lo = init->bci_threshold_lo;
 685         dev_priv->bci_threshold_hi = init->bci_threshold_hi;
 686         dev_priv->dma_type = init->dma_type;
 687
 688         dev_priv->fb_bpp = init->fb_bpp;
 689         dev_priv->front_offset = init->front_offset;
 690         dev_priv->front_pitch = init->front_pitch;
 691         dev_priv->back_offset = init->back_offset;
 692         dev_priv->back_pitch = init->back_pitch;
 693         dev_priv->depth_bpp = init->depth_bpp;
 694         dev_priv->depth_offset = init->depth_offset;
 695         dev_priv->depth_pitch = init->depth_pitch;
 696
 697         dev_priv->texture_offset = init->texture_offset;
 698         dev_priv->texture_size = init->texture_size;
 699
 700         dev_priv->sarea = drm_legacy_getsarea(dev);
 701         if (!dev_priv->sarea) {
 702                 DRM_ERROR("could not find sarea!\n");
 703                 savage_do_cleanup_bci(dev);
 704                 return -EINVAL;
 705         }
 706         if (init->status_offset != 0) {
 707                 dev_priv->status = drm_legacy_findmap(dev, init->status_offset);
 708                 if (!dev_priv->status) {
 709                         DRM_ERROR("could not find shadow status region!\n");
 710                         savage_do_cleanup_bci(dev);
 711                         return -EINVAL;
 712                 }
 713         } else {
 714                 dev_priv->status = NULL;
 715         }
 716         if (dev_priv->dma_type == SAVAGE_DMA_AGP && init->buffers_offset) {
 717                 dev->agp_buffer_token = init->buffers_offset;
 718                 dev->agp_buffer_map = drm_legacy_findmap(dev,
 719                                                        init->buffers_offset);
 720                 if (!dev->agp_buffer_map) {
 721                         DRM_ERROR("could not find DMA buffer region!\n");
 722                         savage_do_cleanup_bci(dev);
 723                         return -EINVAL;
 724                 }
 725                 drm_legacy_ioremap(dev->agp_buffer_map, dev);
 726                 if (!dev->agp_buffer_map->handle) {
 727                         DRM_ERROR("failed to ioremap DMA buffer region!\n");
 728                         savage_do_cleanup_bci(dev);
 729                         return -ENOMEM;
 730                 }
 731         }
 732         if (init->agp_textures_offset) {
 733                 dev_priv->agp_textures =
 734                     drm_legacy_findmap(dev, init->agp_textures_offset);
 735                 if (!dev_priv->agp_textures) {
 736                         DRM_ERROR("could not find agp texture region!\n");
 737                         savage_do_cleanup_bci(dev);
 738                         return -EINVAL;
 739                 }
 740         } else {
 741                 dev_priv->agp_textures = NULL;
 742         }
 743
 744         if (init->cmd_dma_offset) {
 745                 if (S3_SAVAGE3D_SERIES(dev_priv->chipset)) {
 746                         DRM_ERROR("command DMA not supported on "
 747                                   "Savage3D/MX/IX.\n");
 748                         savage_do_cleanup_bci(dev);
 749                         return -EINVAL;
 750                 }
 751                 if (dev->dma && dev->dma->buflist) {
 752                         DRM_ERROR("command and vertex DMA not supported "
 753                                   "at the same time.\n");
 754                         savage_do_cleanup_bci(dev);
 755                         return -EINVAL;
 756                 }
 757                 dev_priv->cmd_dma = drm_legacy_findmap(dev, init->cmd_dma_offset);
 758                 if (!dev_priv->cmd_dma) {
 759                         DRM_ERROR("could not find command DMA region!\n");
 760                         savage_do_cleanup_bci(dev);
 761                         return -EINVAL;
 762                 }
 763                 if (dev_priv->dma_type == SAVAGE_DMA_AGP) {
 764                         if (dev_priv->cmd_dma->type != _DRM_AGP) {
 765                                 DRM_ERROR("AGP command DMA region is not a "
 766                                           "_DRM_AGP map!\n");
 767                                 savage_do_cleanup_bci(dev);
 768                                 return -EINVAL;
 769                         }
 770                         drm_legacy_ioremap(dev_priv->cmd_dma, dev);
 771                         if (!dev_priv->cmd_dma->handle) {
 772                                 DRM_ERROR("failed to ioremap command "
 773                                           "DMA region!\n");
 774                                 savage_do_cleanup_bci(dev);
 775                                 return -ENOMEM;
 776                         }
 777                 } else if (dev_priv->cmd_dma->type != _DRM_CONSISTENT) {
 778                         DRM_ERROR("PCI command DMA region is not a "
 779                                   "_DRM_CONSISTENT map!\n");
 780                         savage_do_cleanup_bci(dev);
 781                         return -EINVAL;
 782                 }
 783         } else {
 784                 dev_priv->cmd_dma = NULL;
 785         }
 786
 787         dev_priv->dma_flush = savage_dma_flush;
 788         if (!dev_priv->cmd_dma) {
 789                 DRM_DEBUG("falling back to faked command DMA.\n");
 790                 dev_priv->fake_dma.offset = 0;
 791                 dev_priv->fake_dma.size = SAVAGE_FAKE_DMA_SIZE;
 792                 dev_priv->fake_dma.type = _DRM_SHM;
 793                 dev_priv->fake_dma.handle = kmalloc(SAVAGE_FAKE_DMA_SIZE,
 794                                                     GFP_KERNEL);
 795                 if (!dev_priv->fake_dma.handle) {
 796                         DRM_ERROR("could not allocate faked DMA buffer!\n");
 797                         savage_do_cleanup_bci(dev);
 798                         return -ENOMEM;
 799                 }
 800                 dev_priv->cmd_dma = &dev_priv->fake_dma;
 801                 dev_priv->dma_flush = savage_fake_dma_flush;
 802         }
 803
 804         dev_priv->sarea_priv =
 805             (drm_savage_sarea_t *) ((uint8_t *) dev_priv->sarea->handle +
 806                                     init->sarea_priv_offset);
 807
 808         /* setup bitmap descriptors */
 809         {
 810                 unsigned int color_tile_format;
 811                 unsigned int depth_tile_format;
 812                 unsigned int front_stride, back_stride, depth_stride;
 813                 if (dev_priv->chipset <= S3_SAVAGE4) {
 814                         color_tile_format = dev_priv->fb_bpp == 16 ?
 815                             SAVAGE_BD_TILE_16BPP : SAVAGE_BD_TILE_32BPP;
 816                         depth_tile_format = dev_priv->depth_bpp == 16 ?
 817                             SAVAGE_BD_TILE_16BPP : SAVAGE_BD_TILE_32BPP;
 818                 } else {
 819                         color_tile_format = SAVAGE_BD_TILE_DEST;
 820                         depth_tile_format = SAVAGE_BD_TILE_DEST;
 821                 }
 822                 front_stride = dev_priv->front_pitch / (dev_priv->fb_bpp / 8);
 823                 back_stride = dev_priv->back_pitch / (dev_priv->fb_bpp / 8);
 824                 depth_stride =
 825                     dev_priv->depth_pitch / (dev_priv->depth_bpp / 8);
 826
 827                 dev_priv->front_bd = front_stride | SAVAGE_BD_BW_DISABLE |
 828                     (dev_priv->fb_bpp << SAVAGE_BD_BPP_SHIFT) |
 829                     (color_tile_format << SAVAGE_BD_TILE_SHIFT);
 830
 831                 dev_priv->back_bd = back_stride | SAVAGE_BD_BW_DISABLE |
 832                     (dev_priv->fb_bpp << SAVAGE_BD_BPP_SHIFT) |
 833                     (color_tile_format << SAVAGE_BD_TILE_SHIFT);
 834
 835                 dev_priv->depth_bd = depth_stride | SAVAGE_BD_BW_DISABLE |
 836                     (dev_priv->depth_bpp << SAVAGE_BD_BPP_SHIFT) |
 837                     (depth_tile_format << SAVAGE_BD_TILE_SHIFT);
 838         }
 839
 840         /* setup status and bci ptr */
 841         dev_priv->event_counter = 0;
 842         dev_priv->event_wrap = 0;
 843         dev_priv->bci_ptr = (volatile uint32_t *)
 844             ((uint8_t *) dev_priv->mmio->handle + SAVAGE_BCI_OFFSET);
 845         if (S3_SAVAGE3D_SERIES(dev_priv->chipset)) {
 846                 dev_priv->status_used_mask = SAVAGE_FIFO_USED_MASK_S3D;
 847         } else {
 848                 dev_priv->status_used_mask = SAVAGE_FIFO_USED_MASK_S4;
 849         }
 850         if (dev_priv->status != NULL) {
 851                 dev_priv->status_ptr =
 852                     (volatile uint32_t *)dev_priv->status->handle;
 853                 dev_priv->wait_fifo = savage_bci_wait_fifo_shadow;
 854                 dev_priv->wait_evnt = savage_bci_wait_event_shadow;
 855                 dev_priv->status_ptr[1023] = dev_priv->event_counter;
 856         } else {
 857                 dev_priv->status_ptr = NULL;
 858                 if (S3_SAVAGE3D_SERIES(dev_priv->chipset)) {
 859                         dev_priv->wait_fifo = savage_bci_wait_fifo_s3d;
 860                 } else {
 861                         dev_priv->wait_fifo = savage_bci_wait_fifo_s4;
 862                 }
 863                 dev_priv->wait_evnt = savage_bci_wait_event_reg;
 864         }
 865
 866         /* cliprect functions */
 867         if (S3_SAVAGE3D_SERIES(dev_priv->chipset))
 868                 dev_priv->emit_clip_rect = savage_emit_clip_rect_s3d;
 869         else
 870                 dev_priv->emit_clip_rect = savage_emit_clip_rect_s4;
 871
 872         if (savage_freelist_init(dev) < 0) {
 873                 DRM_ERROR("could not initialize freelist\n");
 874                 savage_do_cleanup_bci(dev);
 875                 return -ENOMEM;
 876         }
 877
 878         if (savage_dma_init(dev_priv) < 0) {
 879                 DRM_ERROR("could not initialize command DMA\n");
 880                 savage_do_cleanup_bci(dev);
 881                 return -ENOMEM;
 882         }
 883
 884         return 0;
 885 }
 886
 887 static int savage_do_cleanup_bci(struct drm_device * dev)
 888 {
 889         drm_savage_private_t *dev_priv = dev->dev_private;
 890
 891         if (dev_priv->cmd_dma == &dev_priv->fake_dma) {
 892                 kfree(dev_priv->fake_dma.handle);
 893         } else if (dev_priv->cmd_dma && dev_priv->cmd_dma->handle &&
 894                    dev_priv->cmd_dma->type == _DRM_AGP &&
 895                    dev_priv->dma_type == SAVAGE_DMA_AGP)
 896                 drm_legacy_ioremapfree(dev_priv->cmd_dma, dev);
 897
 898         if (dev_priv->dma_type == SAVAGE_DMA_AGP &&
 899             dev->agp_buffer_map && dev->agp_buffer_map->handle) {
 900                 drm_legacy_ioremapfree(dev->agp_buffer_map, dev);
 901                 /* make sure the next instance (which may be running
 902                  * in PCI mode) doesn't try to use an old
 903                  * agp_buffer_map. */
 904                 dev->agp_buffer_map = NULL;
 905         }
 906
 907         kfree(dev_priv->dma_pages);
 908
 909         return 0;
 910 }
 911
 912 static int savage_bci_init(struct drm_device *dev, void *data, struct drm_file *file_priv)
 913 {
 914         drm_savage_init_t *init = data;
 915
 916         LOCK_TEST_WITH_RETURN(dev, file_priv);
 917
 918         switch (init->func) {
 919         case SAVAGE_INIT_BCI:
 920                 return savage_do_init_bci(dev, init);
 921         case SAVAGE_CLEANUP_BCI:
 922                 return savage_do_cleanup_bci(dev);
 923         }
 924
 925         return -EINVAL;
 926 }
 927
 928 static int savage_bci_event_emit(struct drm_device *dev, void *data, struct drm_file *file_priv)
 929 {
 930         drm_savage_private_t *dev_priv = dev->dev_private;
 931         drm_savage_event_emit_t *event = data;
 932
 933         DRM_DEBUG("\n");
 934
 935         LOCK_TEST_WITH_RETURN(dev, file_priv);
 936
 937         event->count = savage_bci_emit_event(dev_priv, event->flags);
 938         event->count |= dev_priv->event_wrap << 16;
 939
 940         return 0;
 941 }
 942
 943 static int savage_bci_event_wait(struct drm_device *dev, void *data, struct drm_file *file_priv)
 944 {
 945         drm_savage_private_t *dev_priv = dev->dev_private;
 946         drm_savage_event_wait_t *event = data;
 947         unsigned int event_e, hw_e;
 948         unsigned int event_w, hw_w;
 949
 950         DRM_DEBUG("\n");
 951
 952         UPDATE_EVENT_COUNTER();
 953         if (dev_priv->status_ptr)
 954                 hw_e = dev_priv->status_ptr[1] & 0xffff;
 955         else
 956                 hw_e = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
 957         hw_w = dev_priv->event_wrap;
 958         if (hw_e > dev_priv->event_counter)
 959                 hw_w--;         /* hardware hasn't passed the last wrap yet */
 960
 961         event_e = event->count & 0xffff;
 962         event_w = event->count >> 16;
 963
 964         /* Don't need to wait if
 965          * - event counter wrapped since the event was emitted or
 966          * - the hardware has advanced up to or over the event to wait for.
 967          */
 968         if (event_w < hw_w || (event_w == hw_w && event_e <= hw_e))
 969                 return 0;
 970         else
 971                 return dev_priv->wait_evnt(dev_priv, event_e);
 972 }
 973
 974 /*
 975  * DMA buffer management
 976  */
 977
 978 static int savage_bci_get_buffers(struct drm_device *dev,
 979                                   struct drm_file *file_priv,
 980                                   struct drm_dma *d)
 981 {
 982         struct drm_buf *buf;
 983         int i;
 984
 985         for (i = d->granted_count; i < d->request_count; i++) {
 986                 buf = savage_freelist_get(dev);
 987                 if (!buf)
 988                         return -EAGAIN;
 989
 990                 buf->file_priv = file_priv;
 991
 992                 if (copy_to_user(&d->request_indices[i],
 993                                      &buf->idx, sizeof(buf->idx)))
 994                         return -EFAULT;
 995                 if (copy_to_user(&d->request_sizes[i],
 996                                      &buf->total, sizeof(buf->total)))
 997                         return -EFAULT;
 998
 999                 d->granted_count++;
1000         }
1001         return 0;
1002 }
1003
1004 int savage_bci_buffers(struct drm_device *dev, void *data, struct drm_file *file_priv)
1005 {
1006         struct drm_device_dma *dma = dev->dma;
1007         struct drm_dma *d = data;
1008         int ret = 0;
1009
1010         LOCK_TEST_WITH_RETURN(dev, file_priv);
1011
1012         /* Please don't send us buffers.
1013          */
1014         if (d->send_count != 0) {
1015                 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
1016                           DRM_CURRENTPID, d->send_count);
1017                 return -EINVAL;
1018         }
1019
1020         /* We'll send you buffers.
1021          */
1022         if (d->request_count < 0 || d->request_count > dma->buf_count) {
1023                 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
1024                           DRM_CURRENTPID, d->request_count, dma->buf_count);
1025                 return -EINVAL;
1026         }
1027
1028         d->granted_count = 0;
1029
1030         if (d->request_count) {
1031                 ret = savage_bci_get_buffers(dev, file_priv, d);
1032         }
1033
1034         return ret;
1035 }
1036
1037 void savage_reclaim_buffers(struct drm_device *dev, struct drm_file *file_priv)
1038 {
1039         struct drm_device_dma *dma = dev->dma;
1040         drm_savage_private_t *dev_priv = dev->dev_private;
1041         int release_idlelock = 0;
1042         int i;
1043
1044         if (!dma)
1045                 return;
1046         if (!dev_priv)
1047                 return;
1048         if (!dma->buflist)
1049                 return;
1050
1051         if (file_priv->master && file_priv->master->lock.hw_lock) {
1052                 drm_legacy_idlelock_take(&file_priv->master->lock);
1053                 release_idlelock = 1;
1054         }
1055
1056         for (i = 0; i < dma->buf_count; i++) {
1057                 struct drm_buf *buf = dma->buflist[i];
1058                 drm_savage_buf_priv_t *buf_priv = buf->dev_private;
1059
1060                 if (buf->file_priv == file_priv && buf_priv &&
1061                     buf_priv->next == NULL && buf_priv->prev == NULL) {
1062                         uint16_t event;
1063                         DRM_DEBUG("reclaimed from client\n");
1064                         event = savage_bci_emit_event(dev_priv, SAVAGE_WAIT_3D);
1065                         SET_AGE(&buf_priv->age, event, dev_priv->event_wrap);
1066                         savage_freelist_put(dev, buf);
1067                 }
1068         }
1069
1070         if (release_idlelock)
1071                 drm_legacy_idlelock_release(&file_priv->master->lock);
1072 }
1073
1074 const struct drm_ioctl_desc savage_ioctls[] = {
1075         DRM_IOCTL_DEF_DRV(SAVAGE_BCI_INIT, savage_bci_init, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
1076         DRM_IOCTL_DEF_DRV(SAVAGE_BCI_CMDBUF, savage_bci_cmdbuf, DRM_AUTH),
1077         DRM_IOCTL_DEF_DRV(SAVAGE_BCI_EVENT_EMIT, savage_bci_event_emit, DRM_AUTH),
1078         DRM_IOCTL_DEF_DRV(SAVAGE_BCI_EVENT_WAIT, savage_bci_event_wait, DRM_AUTH),
1079 };
1080
1081 int savage_max_ioctl = ARRAY_SIZE(savage_ioctls);