drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
   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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "vmwgfx_drv.h"
  29 #include "drmP.h"
  30 #include "ttm/ttm_placement.h"
  31
  32 int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
  33 {
  34         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
  35         uint32_t max;
  36         uint32_t min;
  37         uint32_t dummy;
  38         int ret;
  39
  40         fifo->static_buffer_size = VMWGFX_FIFO_STATIC_SIZE;
  41         fifo->static_buffer = vmalloc(fifo->static_buffer_size);
  42         if (unlikely(fifo->static_buffer == NULL))
  43                 return -ENOMEM;
  44
  45         fifo->last_buffer_size = VMWGFX_FIFO_STATIC_SIZE;
  46         fifo->last_data_size = 0;
  47         fifo->last_buffer_add = false;
  48         fifo->last_buffer = vmalloc(fifo->last_buffer_size);
  49         if (unlikely(fifo->last_buffer == NULL)) {
  50                 ret = -ENOMEM;
  51                 goto out_err;
  52         }
  53
  54         fifo->dynamic_buffer = NULL;
  55         fifo->reserved_size = 0;
  56         fifo->using_bounce_buffer = false;
  57
  58         init_rwsem(&fifo->rwsem);
  59
  60         /*
  61          * Allow mapping the first page read-only to user-space.
  62          */
  63
  64         DRM_INFO("width %d\n", vmw_read(dev_priv, SVGA_REG_WIDTH));
  65         DRM_INFO("height %d\n", vmw_read(dev_priv, SVGA_REG_HEIGHT));
  66         DRM_INFO("bpp %d\n", vmw_read(dev_priv, SVGA_REG_BITS_PER_PIXEL));
  67
  68         mutex_lock(&dev_priv->hw_mutex);
  69         dev_priv->enable_state = vmw_read(dev_priv, SVGA_REG_ENABLE);
  70         dev_priv->config_done_state = vmw_read(dev_priv, SVGA_REG_CONFIG_DONE);
  71         vmw_write(dev_priv, SVGA_REG_ENABLE, 1);
  72
  73         min = 4;
  74         if (dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO)
  75                 min = vmw_read(dev_priv, SVGA_REG_MEM_REGS);
  76         min <<= 2;
  77
  78         if (min < PAGE_SIZE)
  79                 min = PAGE_SIZE;
  80
  81         iowrite32(min, fifo_mem + SVGA_FIFO_MIN);
  82         iowrite32(dev_priv->mmio_size, fifo_mem + SVGA_FIFO_MAX);
  83         wmb();
  84         iowrite32(min,  fifo_mem + SVGA_FIFO_NEXT_CMD);
  85         iowrite32(min,  fifo_mem + SVGA_FIFO_STOP);
  86         iowrite32(0, fifo_mem + SVGA_FIFO_BUSY);
  87         mb();
  88
  89         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE, 1);
  90         mutex_unlock(&dev_priv->hw_mutex);
  91
  92         max = ioread32(fifo_mem + SVGA_FIFO_MAX);
  93         min = ioread32(fifo_mem  + SVGA_FIFO_MIN);
  94         fifo->capabilities = ioread32(fifo_mem + SVGA_FIFO_CAPABILITIES);
  95
  96         DRM_INFO("Fifo max 0x%08x min 0x%08x cap 0x%08x\n",
  97                  (unsigned int) max,
  98                  (unsigned int) min,
  99                  (unsigned int) fifo->capabilities);
 100
 101         dev_priv->fence_seq = dev_priv->last_read_sequence;
 102         iowrite32(dev_priv->last_read_sequence, fifo_mem + SVGA_FIFO_FENCE);
 103
 104         return vmw_fifo_send_fence(dev_priv, &dummy);
 105 out_err:
 106         vfree(fifo->static_buffer);
 107         fifo->static_buffer = NULL;
 108         return ret;
 109 }
 110
 111 void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason)
 112 {
 113         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 114
 115         mutex_lock(&dev_priv->hw_mutex);
 116
 117         if (unlikely(ioread32(fifo_mem + SVGA_FIFO_BUSY) == 0)) {
 118                 iowrite32(1, fifo_mem + SVGA_FIFO_BUSY);
 119                 vmw_write(dev_priv, SVGA_REG_SYNC, reason);
 120         }
 121
 122         mutex_unlock(&dev_priv->hw_mutex);
 123 }
 124
 125 void vmw_fifo_release(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
 126 {
 127         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 128
 129         mutex_lock(&dev_priv->hw_mutex);
 130
 131         while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0)
 132                 vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC);
 133
 134         dev_priv->last_read_sequence = ioread32(fifo_mem + SVGA_FIFO_FENCE);
 135
 136         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE,
 137                   dev_priv->config_done_state);
 138         vmw_write(dev_priv, SVGA_REG_ENABLE,
 139                   dev_priv->enable_state);
 140
 141         mutex_unlock(&dev_priv->hw_mutex);
 142
 143         if (likely(fifo->last_buffer != NULL)) {
 144                 vfree(fifo->last_buffer);
 145                 fifo->last_buffer = NULL;
 146         }
 147
 148         if (likely(fifo->static_buffer != NULL)) {
 149                 vfree(fifo->static_buffer);
 150                 fifo->static_buffer = NULL;
 151         }
 152
 153         if (likely(fifo->dynamic_buffer != NULL)) {
 154                 vfree(fifo->dynamic_buffer);
 155                 fifo->dynamic_buffer = NULL;
 156         }
 157 }
 158
 159 static bool vmw_fifo_is_full(struct vmw_private *dev_priv, uint32_t bytes)
 160 {
 161         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 162         uint32_t max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 163         uint32_t next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
 164         uint32_t min = ioread32(fifo_mem + SVGA_FIFO_MIN);
 165         uint32_t stop = ioread32(fifo_mem + SVGA_FIFO_STOP);
 166
 167         return ((max - next_cmd) + (stop - min) <= bytes);
 168 }
 169
 170 static int vmw_fifo_wait_noirq(struct vmw_private *dev_priv,
 171                                uint32_t bytes, bool interruptible,
 172                                unsigned long timeout)
 173 {
 174         int ret = 0;
 175         unsigned long end_jiffies = jiffies + timeout;
 176         DEFINE_WAIT(__wait);
 177
 178         DRM_INFO("Fifo wait noirq.\n");
 179
 180         for (;;) {
 181                 prepare_to_wait(&dev_priv->fifo_queue, &__wait,
 182                                 (interruptible) ?
 183                                 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 184                 if (!vmw_fifo_is_full(dev_priv, bytes))
 185                         break;
 186                 if (time_after_eq(jiffies, end_jiffies)) {
 187                         ret = -EBUSY;
 188                         DRM_ERROR("SVGA device lockup.\n");
 189                         break;
 190                 }
 191                 schedule_timeout(1);
 192                 if (interruptible && signal_pending(current)) {
 193                         ret = -ERESTARTSYS;
 194                         break;
 195                 }
 196         }
 197         finish_wait(&dev_priv->fifo_queue, &__wait);
 198         wake_up_all(&dev_priv->fifo_queue);
 199         DRM_INFO("Fifo noirq exit.\n");
 200         return ret;
 201 }
 202
 203 static int vmw_fifo_wait(struct vmw_private *dev_priv,
 204                          uint32_t bytes, bool interruptible,
 205                          unsigned long timeout)
 206 {
 207         long ret = 1L;
 208         unsigned long irq_flags;
 209
 210         if (likely(!vmw_fifo_is_full(dev_priv, bytes)))
 211                 return 0;
 212
 213         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_FIFOFULL);
 214         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 215                 return vmw_fifo_wait_noirq(dev_priv, bytes,
 216                                            interruptible, timeout);
 217
 218         mutex_lock(&dev_priv->hw_mutex);
 219         if (atomic_add_return(1, &dev_priv->fifo_queue_waiters) > 0) {
 220                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 221                 outl(SVGA_IRQFLAG_FIFO_PROGRESS,
 222                      dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 223                 vmw_write(dev_priv, SVGA_REG_IRQMASK,
 224                           vmw_read(dev_priv, SVGA_REG_IRQMASK) |
 225                           SVGA_IRQFLAG_FIFO_PROGRESS);
 226                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 227         }
 228         mutex_unlock(&dev_priv->hw_mutex);
 229
 230         if (interruptible)
 231                 ret = wait_event_interruptible_timeout
 232                     (dev_priv->fifo_queue,
 233                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 234         else
 235                 ret = wait_event_timeout
 236                     (dev_priv->fifo_queue,
 237                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 238
 239         if (unlikely(ret == 0))
 240                 ret = -EBUSY;
 241         else if (likely(ret > 0))
 242                 ret = 0;
 243
 244         mutex_lock(&dev_priv->hw_mutex);
 245         if (atomic_dec_and_test(&dev_priv->fifo_queue_waiters)) {
 246                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 247                 vmw_write(dev_priv, SVGA_REG_IRQMASK,
 248                           vmw_read(dev_priv, SVGA_REG_IRQMASK) &
 249                           ~SVGA_IRQFLAG_FIFO_PROGRESS);
 250                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 251         }
 252         mutex_unlock(&dev_priv->hw_mutex);
 253
 254         return ret;
 255 }
 256
 257 void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes)
 258 {
 259         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 260         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 261         uint32_t max;
 262         uint32_t min;
 263         uint32_t next_cmd;
 264         uint32_t reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 265         int ret;
 266
 267         down_write(&fifo_state->rwsem);
 268         max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 269         min = ioread32(fifo_mem + SVGA_FIFO_MIN);
 270         next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
 271
 272         if (unlikely(bytes >= (max - min)))
 273                 goto out_err;
 274
 275         BUG_ON(fifo_state->reserved_size != 0);
 276         BUG_ON(fifo_state->dynamic_buffer != NULL);
 277
 278         fifo_state->reserved_size = bytes;
 279
 280         while (1) {
 281                 uint32_t stop = ioread32(fifo_mem + SVGA_FIFO_STOP);
 282                 bool need_bounce = false;
 283                 bool reserve_in_place = false;
 284
 285                 if (next_cmd >= stop) {
 286                         if (likely((next_cmd + bytes < max ||
 287                                     (next_cmd + bytes == max && stop > min))))
 288                                 reserve_in_place = true;
 289
 290                         else if (vmw_fifo_is_full(dev_priv, bytes)) {
 291                                 ret = vmw_fifo_wait(dev_priv, bytes,
 292                                                     false, 3 * HZ);
 293                                 if (unlikely(ret != 0))
 294                                         goto out_err;
 295                         } else
 296                                 need_bounce = true;
 297
 298                 } else {
 299
 300                         if (likely((next_cmd + bytes < stop)))
 301                                 reserve_in_place = true;
 302                         else {
 303                                 ret = vmw_fifo_wait(dev_priv, bytes,
 304                                                     false, 3 * HZ);
 305                                 if (unlikely(ret != 0))
 306                                         goto out_err;
 307                         }
 308                 }
 309
 310                 if (reserve_in_place) {
 311                         if (reserveable || bytes <= sizeof(uint32_t)) {
 312                                 fifo_state->using_bounce_buffer = false;
 313
 314                                 if (reserveable)
 315                                         iowrite32(bytes, fifo_mem +
 316                                                   SVGA_FIFO_RESERVED);
 317                                 return fifo_mem + (next_cmd >> 2);
 318                         } else {
 319                                 need_bounce = true;
 320                         }
 321                 }
 322
 323                 if (need_bounce) {
 324                         fifo_state->using_bounce_buffer = true;
 325                         if (bytes < fifo_state->static_buffer_size)
 326                                 return fifo_state->static_buffer;
 327                         else {
 328                                 fifo_state->dynamic_buffer = vmalloc(bytes);
 329                                 return fifo_state->dynamic_buffer;
 330                         }
 331                 }
 332         }
 333 out_err:
 334         fifo_state->reserved_size = 0;
 335         up_write(&fifo_state->rwsem);
 336         return NULL;
 337 }
 338
 339 static void vmw_fifo_res_copy(struct vmw_fifo_state *fifo_state,
 340                               __le32 __iomem *fifo_mem,
 341                               uint32_t next_cmd,
 342                               uint32_t max, uint32_t min, uint32_t bytes)
 343 {
 344         uint32_t chunk_size = max - next_cmd;
 345         uint32_t rest;
 346         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 347             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 348
 349         if (bytes < chunk_size)
 350                 chunk_size = bytes;
 351
 352         iowrite32(bytes, fifo_mem + SVGA_FIFO_RESERVED);
 353         mb();
 354         memcpy_toio(fifo_mem + (next_cmd >> 2), buffer, chunk_size);
 355         rest = bytes - chunk_size;
 356         if (rest)
 357                 memcpy_toio(fifo_mem + (min >> 2), buffer + (chunk_size >> 2),
 358                             rest);
 359 }
 360
 361 static void vmw_fifo_slow_copy(struct vmw_fifo_state *fifo_state,
 362                                __le32 __iomem *fifo_mem,
 363                                uint32_t next_cmd,
 364                                uint32_t max, uint32_t min, uint32_t bytes)
 365 {
 366         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 367             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 368
 369         while (bytes > 0) {
 370                 iowrite32(*buffer++, fifo_mem + (next_cmd >> 2));
 371                 next_cmd += sizeof(uint32_t);
 372                 if (unlikely(next_cmd == max))
 373                         next_cmd = min;
 374                 mb();
 375                 iowrite32(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);
 376                 mb();
 377                 bytes -= sizeof(uint32_t);
 378         }
 379 }
 380
 381 void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
 382 {
 383         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 384         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
 385         uint32_t next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
 386         uint32_t max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 387         uint32_t min = ioread32(fifo_mem + SVGA_FIFO_MIN);
 388         bool reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 389
 390         BUG_ON((bytes & 3) != 0);
 391         BUG_ON(bytes > fifo_state->reserved_size);
 392
 393         fifo_state->reserved_size = 0;
 394
 395         if (fifo_state->using_bounce_buffer) {
 396                 if (reserveable)
 397                         vmw_fifo_res_copy(fifo_state, fifo_mem,
 398                                           next_cmd, max, min, bytes);
 399                 else
 400                         vmw_fifo_slow_copy(fifo_state, fifo_mem,
 401                                            next_cmd, max, min, bytes);
 402
 403                 if (fifo_state->dynamic_buffer) {
 404                         vfree(fifo_state->dynamic_buffer);
 405                         fifo_state->dynamic_buffer = NULL;
 406                 }
 407
 408         }
 409
 410         if (fifo_state->using_bounce_buffer || reserveable) {
 411                 next_cmd += bytes;
 412                 if (next_cmd >= max)
 413                         next_cmd -= max - min;
 414                 mb();
 415                 iowrite32(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);
 416         }
 417
 418         if (reserveable)
 419                 iowrite32(0, fifo_mem + SVGA_FIFO_RESERVED);
 420         mb();
 421         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 422         up_write(&fifo_state->rwsem);
 423 }
 424
 425 int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *sequence)
 426 {
 427         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 428         struct svga_fifo_cmd_fence *cmd_fence;
 429         void *fm;
 430         int ret = 0;
 431         uint32_t bytes = sizeof(__le32) + sizeof(*cmd_fence);
 432
 433         fm = vmw_fifo_reserve(dev_priv, bytes);
 434         if (unlikely(fm == NULL)) {
 435                 down_write(&fifo_state->rwsem);
 436                 *sequence = dev_priv->fence_seq;
 437                 up_write(&fifo_state->rwsem);
 438                 ret = -ENOMEM;
 439                 (void)vmw_fallback_wait(dev_priv, false, true, *sequence,
 440                                         false, 3*HZ);
 441                 goto out_err;
 442         }
 443
 444         do {
 445                 *sequence = dev_priv->fence_seq++;
 446         } while (*sequence == 0);
 447
 448         if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE)) {
 449
 450                 /*
 451                  * Don't request hardware to send a fence. The
 452                  * waiting code in vmwgfx_irq.c will emulate this.
 453                  */
 454
 455                 vmw_fifo_commit(dev_priv, 0);
 456                 return 0;
 457         }
 458
 459         *(__le32 *) fm = cpu_to_le32(SVGA_CMD_FENCE);
 460         cmd_fence = (struct svga_fifo_cmd_fence *)
 461             ((unsigned long)fm + sizeof(__le32));
 462
 463         iowrite32(*sequence, &cmd_fence->fence);
 464         fifo_state->last_buffer_add = true;
 465         vmw_fifo_commit(dev_priv, bytes);
 466         fifo_state->last_buffer_add = false;
 467
 468 out_err:
 469         return ret;
 470 }
 471
 472 /**
 473  * Map the first page of the FIFO read-only to user-space.
 474  */
 475
 476 static int vmw_fifo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 477 {
 478         int ret;
 479         unsigned long address = (unsigned long)vmf->virtual_address;
 480
 481         if (address != vma->vm_start)
 482                 return VM_FAULT_SIGBUS;
 483
 484         ret = vm_insert_pfn(vma, address, vma->vm_pgoff);
 485         if (likely(ret == -EBUSY || ret == 0))
 486                 return VM_FAULT_NOPAGE;
 487         else if (ret == -ENOMEM)
 488                 return VM_FAULT_OOM;
 489
 490         return VM_FAULT_SIGBUS;
 491 }
 492
 493 static struct vm_operations_struct vmw_fifo_vm_ops = {
 494         .fault = vmw_fifo_vm_fault,
 495         .open = NULL,
 496         .close = NULL
 497 };
 498
 499 int vmw_fifo_mmap(struct file *filp, struct vm_area_struct *vma)
 500 {
 501         struct drm_file *file_priv;
 502         struct vmw_private *dev_priv;
 503
 504         file_priv = (struct drm_file *)filp->private_data;
 505         dev_priv = vmw_priv(file_priv->minor->dev);
 506
 507         if (vma->vm_pgoff != (dev_priv->mmio_start >> PAGE_SHIFT) ||
 508             (vma->vm_end - vma->vm_start) != PAGE_SIZE)
 509                 return -EINVAL;
 510
 511         vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 512         vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_SHARED;
 513         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 514         vma->vm_page_prot = ttm_io_prot(TTM_PL_FLAG_UNCACHED,
 515                                         vma->vm_page_prot);
 516         vma->vm_ops = &vmw_fifo_vm_ops;
 517         return 0;
 518 }