drivers/staging/gma500/mmu.c

   1 /**************************************************************************
   2  * Copyright (c) 2007, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  **************************************************************************/
  18 #include <drm/drmP.h>
  19 #include "psb_drv.h"
  20 #include "psb_reg.h"
  21
  22 /*
  23  * Code for the SGX MMU:
  24  */
  25
  26 /*
  27  * clflush on one processor only:
  28  * clflush should apparently flush the cache line on all processors in an
  29  * SMP system.
  30  */
  31
  32 /*
  33  * kmap atomic:
  34  * The usage of the slots must be completely encapsulated within a spinlock, and
  35  * no other functions that may be using the locks for other purposed may be
  36  * called from within the locked region.
  37  * Since the slots are per processor, this will guarantee that we are the only
  38  * user.
  39  */
  40
  41 /*
  42  * TODO: Inserting ptes from an interrupt handler:
  43  * This may be desirable for some SGX functionality where the GPU can fault in
  44  * needed pages. For that, we need to make an atomic insert_pages function, that
  45  * may fail.
  46  * If it fails, the caller need to insert the page using a workqueue function,
  47  * but on average it should be fast.
  48  */
  49
  50 struct psb_mmu_driver {
  51         /* protects driver- and pd structures. Always take in read mode
  52          * before taking the page table spinlock.
  53          */
  54         struct rw_semaphore sem;
  55
  56         /* protects page tables, directory tables and pt tables.
  57          * and pt structures.
  58          */
  59         spinlock_t lock;
  60
  61         atomic_t needs_tlbflush;
  62
  63         uint8_t __iomem *register_map;
  64         struct psb_mmu_pd *default_pd;
  65         /*uint32_t bif_ctrl;*/
  66         int has_clflush;
  67         int clflush_add;
  68         unsigned long clflush_mask;
  69
  70         struct drm_psb_private *dev_priv;
  71 };
  72
  73 struct psb_mmu_pd;
  74
  75 struct psb_mmu_pt {
  76         struct psb_mmu_pd *pd;
  77         uint32_t index;
  78         uint32_t count;
  79         struct page *p;
  80         uint32_t *v;
  81 };
  82
  83 struct psb_mmu_pd {
  84         struct psb_mmu_driver *driver;
  85         int hw_context;
  86         struct psb_mmu_pt **tables;
  87         struct page *p;
  88         struct page *dummy_pt;
  89         struct page *dummy_page;
  90         uint32_t pd_mask;
  91         uint32_t invalid_pde;
  92         uint32_t invalid_pte;
  93 };
  94
  95 static inline uint32_t psb_mmu_pt_index(uint32_t offset)
  96 {
  97         return (offset >> PSB_PTE_SHIFT) & 0x3FF;
  98 }
  99
 100 static inline uint32_t psb_mmu_pd_index(uint32_t offset)
 101 {
 102         return offset >> PSB_PDE_SHIFT;
 103 }
 104
 105 static inline void psb_clflush(void *addr)
 106 {
 107         __asm__ __volatile__("clflush (%0)\n" : : "r"(addr) : "memory");
 108 }
 109
 110 static inline void psb_mmu_clflush(struct psb_mmu_driver *driver,
 111                                    void *addr)
 112 {
 113         if (!driver->has_clflush)
 114                 return;
 115
 116         mb();
 117         psb_clflush(addr);
 118         mb();
 119 }
 120
 121 static void psb_page_clflush(struct psb_mmu_driver *driver, struct page* page)
 122 {
 123         uint32_t clflush_add = driver->clflush_add >> PAGE_SHIFT;
 124         uint32_t clflush_count = PAGE_SIZE / clflush_add;
 125         int i;
 126         uint8_t *clf;
 127
 128         clf = kmap_atomic(page, KM_USER0);
 129         mb();
 130         for (i = 0; i < clflush_count; ++i) {
 131                 psb_clflush(clf);
 132                 clf += clflush_add;
 133         }
 134         mb();
 135         kunmap_atomic(clf, KM_USER0);
 136 }
 137
 138 static void psb_pages_clflush(struct psb_mmu_driver *driver,
 139                                 struct page *page[], unsigned long num_pages)
 140 {
 141         int i;
 142
 143         if (!driver->has_clflush)
 144                 return ;
 145
 146         for (i = 0; i < num_pages; i++)
 147                 psb_page_clflush(driver, *page++);
 148 }
 149
 150 static void psb_mmu_flush_pd_locked(struct psb_mmu_driver *driver,
 151                                     int force)
 152 {
 153         atomic_set(&driver->needs_tlbflush, 0);
 154 }
 155
 156 static void psb_mmu_flush_pd(struct psb_mmu_driver *driver, int force)
 157 {
 158         down_write(&driver->sem);
 159         psb_mmu_flush_pd_locked(driver, force);
 160         up_write(&driver->sem);
 161 }
 162
 163 void psb_mmu_flush(struct psb_mmu_driver *driver, int rc_prot)
 164 {
 165         if (rc_prot)
 166                 down_write(&driver->sem);
 167         if (rc_prot)
 168                 up_write(&driver->sem);
 169 }
 170
 171 void psb_mmu_set_pd_context(struct psb_mmu_pd *pd, int hw_context)
 172 {
 173         /*ttm_tt_cache_flush(&pd->p, 1);*/
 174         psb_pages_clflush(pd->driver, &pd->p, 1);
 175         down_write(&pd->driver->sem);
 176         wmb();
 177         psb_mmu_flush_pd_locked(pd->driver, 1);
 178         pd->hw_context = hw_context;
 179         up_write(&pd->driver->sem);
 180
 181 }
 182
 183 static inline unsigned long psb_pd_addr_end(unsigned long addr,
 184                                             unsigned long end)
 185 {
 186
 187         addr = (addr + PSB_PDE_MASK + 1) & ~PSB_PDE_MASK;
 188         return (addr < end) ? addr : end;
 189 }
 190
 191 static inline uint32_t psb_mmu_mask_pte(uint32_t pfn, int type)
 192 {
 193         uint32_t mask = PSB_PTE_VALID;
 194
 195         if (type & PSB_MMU_CACHED_MEMORY)
 196                 mask |= PSB_PTE_CACHED;
 197         if (type & PSB_MMU_RO_MEMORY)
 198                 mask |= PSB_PTE_RO;
 199         if (type & PSB_MMU_WO_MEMORY)
 200                 mask |= PSB_PTE_WO;
 201
 202         return (pfn << PAGE_SHIFT) | mask;
 203 }
 204
 205 struct psb_mmu_pd *psb_mmu_alloc_pd(struct psb_mmu_driver *driver,
 206                                     int trap_pagefaults, int invalid_type)
 207 {
 208         struct psb_mmu_pd *pd = kmalloc(sizeof(*pd), GFP_KERNEL);
 209         uint32_t *v;
 210         int i;
 211
 212         if (!pd)
 213                 return NULL;
 214
 215         pd->p = alloc_page(GFP_DMA32);
 216         if (!pd->p)
 217                 goto out_err1;
 218         pd->dummy_pt = alloc_page(GFP_DMA32);
 219         if (!pd->dummy_pt)
 220                 goto out_err2;
 221         pd->dummy_page = alloc_page(GFP_DMA32);
 222         if (!pd->dummy_page)
 223                 goto out_err3;
 224
 225         if (!trap_pagefaults) {
 226                 pd->invalid_pde =
 227                     psb_mmu_mask_pte(page_to_pfn(pd->dummy_pt),
 228                                      invalid_type);
 229                 pd->invalid_pte =
 230                     psb_mmu_mask_pte(page_to_pfn(pd->dummy_page),
 231                                      invalid_type);
 232         } else {
 233                 pd->invalid_pde = 0;
 234                 pd->invalid_pte = 0;
 235         }
 236
 237         v = kmap(pd->dummy_pt);
 238         for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
 239                 v[i] = pd->invalid_pte;
 240
 241         kunmap(pd->dummy_pt);
 242
 243         v = kmap(pd->p);
 244         for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
 245                 v[i] = pd->invalid_pde;
 246
 247         kunmap(pd->p);
 248
 249         clear_page(kmap(pd->dummy_page));
 250         kunmap(pd->dummy_page);
 251
 252         pd->tables = vmalloc_user(sizeof(struct psb_mmu_pt *) * 1024);
 253         if (!pd->tables)
 254                 goto out_err4;
 255
 256         pd->hw_context = -1;
 257         pd->pd_mask = PSB_PTE_VALID;
 258         pd->driver = driver;
 259
 260         return pd;
 261
 262 out_err4:
 263         __free_page(pd->dummy_page);
 264 out_err3:
 265         __free_page(pd->dummy_pt);
 266 out_err2:
 267         __free_page(pd->p);
 268 out_err1:
 269         kfree(pd);
 270         return NULL;
 271 }
 272
 273 void psb_mmu_free_pt(struct psb_mmu_pt *pt)
 274 {
 275         __free_page(pt->p);
 276         kfree(pt);
 277 }
 278
 279 void psb_mmu_free_pagedir(struct psb_mmu_pd *pd)
 280 {
 281         struct psb_mmu_driver *driver = pd->driver;
 282         struct psb_mmu_pt *pt;
 283         int i;
 284
 285         down_write(&driver->sem);
 286         if (pd->hw_context != -1)
 287                 psb_mmu_flush_pd_locked(driver, 1);
 288
 289         /* Should take the spinlock here, but we don't need to do that
 290            since we have the semaphore in write mode. */
 291
 292         for (i = 0; i < 1024; ++i) {
 293                 pt = pd->tables[i];
 294                 if (pt)
 295                         psb_mmu_free_pt(pt);
 296         }
 297
 298         vfree(pd->tables);
 299         __free_page(pd->dummy_page);
 300         __free_page(pd->dummy_pt);
 301         __free_page(pd->p);
 302         kfree(pd);
 303         up_write(&driver->sem);
 304 }
 305
 306 static struct psb_mmu_pt *psb_mmu_alloc_pt(struct psb_mmu_pd *pd)
 307 {
 308         struct psb_mmu_pt *pt = kmalloc(sizeof(*pt), GFP_KERNEL);
 309         void *v;
 310         uint32_t clflush_add = pd->driver->clflush_add >> PAGE_SHIFT;
 311         uint32_t clflush_count = PAGE_SIZE / clflush_add;
 312         spinlock_t *lock = &pd->driver->lock;
 313         uint8_t *clf;
 314         uint32_t *ptes;
 315         int i;
 316
 317         if (!pt)
 318                 return NULL;
 319
 320         pt->p = alloc_page(GFP_DMA32);
 321         if (!pt->p) {
 322                 kfree(pt);
 323                 return NULL;
 324         }
 325
 326         spin_lock(lock);
 327
 328         v = kmap_atomic(pt->p, KM_USER0);
 329         clf = (uint8_t *) v;
 330         ptes = (uint32_t *) v;
 331         for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
 332                 *ptes++ = pd->invalid_pte;
 333
 334
 335         if (pd->driver->has_clflush && pd->hw_context != -1) {
 336                 mb();
 337                 for (i = 0; i < clflush_count; ++i) {
 338                         psb_clflush(clf);
 339                         clf += clflush_add;
 340                 }
 341                 mb();
 342         }
 343
 344         kunmap_atomic(v, KM_USER0);
 345         spin_unlock(lock);
 346
 347         pt->count = 0;
 348         pt->pd = pd;
 349         pt->index = 0;
 350
 351         return pt;
 352 }
 353
 354 struct psb_mmu_pt *psb_mmu_pt_alloc_map_lock(struct psb_mmu_pd *pd,
 355                                              unsigned long addr)
 356 {
 357         uint32_t index = psb_mmu_pd_index(addr);
 358         struct psb_mmu_pt *pt;
 359         uint32_t *v;
 360         spinlock_t *lock = &pd->driver->lock;
 361
 362         spin_lock(lock);
 363         pt = pd->tables[index];
 364         while (!pt) {
 365                 spin_unlock(lock);
 366                 pt = psb_mmu_alloc_pt(pd);
 367                 if (!pt)
 368                         return NULL;
 369                 spin_lock(lock);
 370
 371                 if (pd->tables[index]) {
 372                         spin_unlock(lock);
 373                         psb_mmu_free_pt(pt);
 374                         spin_lock(lock);
 375                         pt = pd->tables[index];
 376                         continue;
 377                 }
 378
 379                 v = kmap_atomic(pd->p, KM_USER0);
 380                 pd->tables[index] = pt;
 381                 v[index] = (page_to_pfn(pt->p) << 12) | pd->pd_mask;
 382                 pt->index = index;
 383                 kunmap_atomic((void *) v, KM_USER0);
 384
 385                 if (pd->hw_context != -1) {
 386                         psb_mmu_clflush(pd->driver, (void *) &v[index]);
 387                         atomic_set(&pd->driver->needs_tlbflush, 1);
 388                 }
 389         }
 390         pt->v = kmap_atomic(pt->p, KM_USER0);
 391         return pt;
 392 }
 393
 394 static struct psb_mmu_pt *psb_mmu_pt_map_lock(struct psb_mmu_pd *pd,
 395                                               unsigned long addr)
 396 {
 397         uint32_t index = psb_mmu_pd_index(addr);
 398         struct psb_mmu_pt *pt;
 399         spinlock_t *lock = &pd->driver->lock;
 400
 401         spin_lock(lock);
 402         pt = pd->tables[index];
 403         if (!pt) {
 404                 spin_unlock(lock);
 405                 return NULL;
 406         }
 407         pt->v = kmap_atomic(pt->p, KM_USER0);
 408         return pt;
 409 }
 410
 411 static void psb_mmu_pt_unmap_unlock(struct psb_mmu_pt *pt)
 412 {
 413         struct psb_mmu_pd *pd = pt->pd;
 414         uint32_t *v;
 415
 416         kunmap_atomic(pt->v, KM_USER0);
 417         if (pt->count == 0) {
 418                 v = kmap_atomic(pd->p, KM_USER0);
 419                 v[pt->index] = pd->invalid_pde;
 420                 pd->tables[pt->index] = NULL;
 421
 422                 if (pd->hw_context != -1) {
 423                         psb_mmu_clflush(pd->driver,
 424                                         (void *) &v[pt->index]);
 425                         atomic_set(&pd->driver->needs_tlbflush, 1);
 426                 }
 427                 kunmap_atomic(pt->v, KM_USER0);
 428                 spin_unlock(&pd->driver->lock);
 429                 psb_mmu_free_pt(pt);
 430                 return;
 431         }
 432         spin_unlock(&pd->driver->lock);
 433 }
 434
 435 static inline void psb_mmu_set_pte(struct psb_mmu_pt *pt,
 436                                    unsigned long addr, uint32_t pte)
 437 {
 438         pt->v[psb_mmu_pt_index(addr)] = pte;
 439 }
 440
 441 static inline void psb_mmu_invalidate_pte(struct psb_mmu_pt *pt,
 442                                           unsigned long addr)
 443 {
 444         pt->v[psb_mmu_pt_index(addr)] = pt->pd->invalid_pte;
 445 }
 446
 447
 448 void psb_mmu_mirror_gtt(struct psb_mmu_pd *pd,
 449                         uint32_t mmu_offset, uint32_t gtt_start,
 450                         uint32_t gtt_pages)
 451 {
 452         uint32_t *v;
 453         uint32_t start = psb_mmu_pd_index(mmu_offset);
 454         struct psb_mmu_driver *driver = pd->driver;
 455         int num_pages = gtt_pages;
 456
 457         down_read(&driver->sem);
 458         spin_lock(&driver->lock);
 459
 460         v = kmap_atomic(pd->p, KM_USER0);
 461         v += start;
 462
 463         while (gtt_pages--) {
 464                 *v++ = gtt_start | pd->pd_mask;
 465                 gtt_start += PAGE_SIZE;
 466         }
 467
 468         /*ttm_tt_cache_flush(&pd->p, num_pages);*/
 469         psb_pages_clflush(pd->driver, &pd->p, num_pages);
 470         kunmap_atomic(v, KM_USER0);
 471         spin_unlock(&driver->lock);
 472
 473         if (pd->hw_context != -1)
 474                 atomic_set(&pd->driver->needs_tlbflush, 1);
 475
 476         up_read(&pd->driver->sem);
 477         psb_mmu_flush_pd(pd->driver, 0);
 478 }
 479
 480 struct psb_mmu_pd *psb_mmu_get_default_pd(struct psb_mmu_driver *driver)
 481 {
 482         struct psb_mmu_pd *pd;
 483
 484         /* down_read(&driver->sem); */
 485         pd = driver->default_pd;
 486         /* up_read(&driver->sem); */
 487
 488         return pd;
 489 }
 490
 491 /* Returns the physical address of the PD shared by sgx/msvdx */
 492 uint32_t psb_get_default_pd_addr(struct psb_mmu_driver *driver)
 493 {
 494         struct psb_mmu_pd *pd;
 495
 496         pd = psb_mmu_get_default_pd(driver);
 497         return page_to_pfn(pd->p) << PAGE_SHIFT;
 498 }
 499
 500 void psb_mmu_driver_takedown(struct psb_mmu_driver *driver)
 501 {
 502         psb_mmu_free_pagedir(driver->default_pd);
 503         kfree(driver);
 504 }
 505
 506 struct psb_mmu_driver *psb_mmu_driver_init(uint8_t __iomem * registers,
 507                                         int trap_pagefaults,
 508                                         int invalid_type,
 509                                         struct drm_psb_private *dev_priv)
 510 {
 511         struct psb_mmu_driver *driver;
 512
 513         driver = kmalloc(sizeof(*driver), GFP_KERNEL);
 514
 515         if (!driver)
 516                 return NULL;
 517         driver->dev_priv = dev_priv;
 518
 519         driver->default_pd = psb_mmu_alloc_pd(driver, trap_pagefaults,
 520                                               invalid_type);
 521         if (!driver->default_pd)
 522                 goto out_err1;
 523
 524         spin_lock_init(&driver->lock);
 525         init_rwsem(&driver->sem);
 526         down_write(&driver->sem);
 527         driver->register_map = registers;
 528         atomic_set(&driver->needs_tlbflush, 1);
 529
 530         driver->has_clflush = 0;
 531
 532         if (boot_cpu_has(X86_FEATURE_CLFLSH)) {
 533                 uint32_t tfms, misc, cap0, cap4, clflush_size;
 534
 535                 /*
 536                  * clflush size is determined at kernel setup for x86_64
 537                  *  but not for i386. We have to do it here.
 538                  */
 539
 540                 cpuid(0x00000001, &tfms, &misc, &cap0, &cap4);
 541                 clflush_size = ((misc >> 8) & 0xff) * 8;
 542                 driver->has_clflush = 1;
 543                 driver->clflush_add =
 544                     PAGE_SIZE * clflush_size / sizeof(uint32_t);
 545                 driver->clflush_mask = driver->clflush_add - 1;
 546                 driver->clflush_mask = ~driver->clflush_mask;
 547         }
 548
 549         up_write(&driver->sem);
 550         return driver;
 551
 552 out_err1:
 553         kfree(driver);
 554         return NULL;
 555 }
 556
 557 static void psb_mmu_flush_ptes(struct psb_mmu_pd *pd,
 558                                unsigned long address, uint32_t num_pages,
 559                                uint32_t desired_tile_stride,
 560                                uint32_t hw_tile_stride)
 561 {
 562         struct psb_mmu_pt *pt;
 563         uint32_t rows = 1;
 564         uint32_t i;
 565         unsigned long addr;
 566         unsigned long end;
 567         unsigned long next;
 568         unsigned long add;
 569         unsigned long row_add;
 570         unsigned long clflush_add = pd->driver->clflush_add;
 571         unsigned long clflush_mask = pd->driver->clflush_mask;
 572
 573         if (!pd->driver->has_clflush) {
 574                 /*ttm_tt_cache_flush(&pd->p, num_pages);*/
 575                 psb_pages_clflush(pd->driver, &pd->p, num_pages);
 576                 return;
 577         }
 578
 579         if (hw_tile_stride)
 580                 rows = num_pages / desired_tile_stride;
 581         else
 582                 desired_tile_stride = num_pages;
 583
 584         add = desired_tile_stride << PAGE_SHIFT;
 585         row_add = hw_tile_stride << PAGE_SHIFT;
 586         mb();
 587         for (i = 0; i < rows; ++i) {
 588
 589                 addr = address;
 590                 end = addr + add;
 591
 592                 do {
 593                         next = psb_pd_addr_end(addr, end);
 594                         pt = psb_mmu_pt_map_lock(pd, addr);
 595                         if (!pt)
 596                                 continue;
 597                         do {
 598                                 psb_clflush(&pt->v
 599                                             [psb_mmu_pt_index(addr)]);
 600                         } while (addr +=
 601                                  clflush_add,
 602                                  (addr & clflush_mask) < next);
 603
 604                         psb_mmu_pt_unmap_unlock(pt);
 605                 } while (addr = next, next != end);
 606                 address += row_add;
 607         }
 608         mb();
 609 }
 610
 611 void psb_mmu_remove_pfn_sequence(struct psb_mmu_pd *pd,
 612                                  unsigned long address, uint32_t num_pages)
 613 {
 614         struct psb_mmu_pt *pt;
 615         unsigned long addr;
 616         unsigned long end;
 617         unsigned long next;
 618         unsigned long f_address = address;
 619
 620         down_read(&pd->driver->sem);
 621
 622         addr = address;
 623         end = addr + (num_pages << PAGE_SHIFT);
 624
 625         do {
 626                 next = psb_pd_addr_end(addr, end);
 627                 pt = psb_mmu_pt_alloc_map_lock(pd, addr);
 628                 if (!pt)
 629                         goto out;
 630                 do {
 631                         psb_mmu_invalidate_pte(pt, addr);
 632                         --pt->count;
 633                 } while (addr += PAGE_SIZE, addr < next);
 634                 psb_mmu_pt_unmap_unlock(pt);
 635
 636         } while (addr = next, next != end);
 637
 638 out:
 639         if (pd->hw_context != -1)
 640                 psb_mmu_flush_ptes(pd, f_address, num_pages, 1, 1);
 641
 642         up_read(&pd->driver->sem);
 643
 644         if (pd->hw_context != -1)
 645                 psb_mmu_flush(pd->driver, 0);
 646
 647         return;
 648 }
 649
 650 void psb_mmu_remove_pages(struct psb_mmu_pd *pd, unsigned long address,
 651                           uint32_t num_pages, uint32_t desired_tile_stride,
 652                           uint32_t hw_tile_stride)
 653 {
 654         struct psb_mmu_pt *pt;
 655         uint32_t rows = 1;
 656         uint32_t i;
 657         unsigned long addr;
 658         unsigned long end;
 659         unsigned long next;
 660         unsigned long add;
 661         unsigned long row_add;
 662         unsigned long f_address = address;
 663
 664         if (hw_tile_stride)
 665                 rows = num_pages / desired_tile_stride;
 666         else
 667                 desired_tile_stride = num_pages;
 668
 669         add = desired_tile_stride << PAGE_SHIFT;
 670         row_add = hw_tile_stride << PAGE_SHIFT;
 671
 672         /* down_read(&pd->driver->sem); */
 673
 674         /* Make sure we only need to flush this processor's cache */
 675
 676         for (i = 0; i < rows; ++i) {
 677
 678                 addr = address;
 679                 end = addr + add;
 680
 681                 do {
 682                         next = psb_pd_addr_end(addr, end);
 683                         pt = psb_mmu_pt_map_lock(pd, addr);
 684                         if (!pt)
 685                                 continue;
 686                         do {
 687                                 psb_mmu_invalidate_pte(pt, addr);
 688                                 --pt->count;
 689
 690                         } while (addr += PAGE_SIZE, addr < next);
 691                         psb_mmu_pt_unmap_unlock(pt);
 692
 693                 } while (addr = next, next != end);
 694                 address += row_add;
 695         }
 696         if (pd->hw_context != -1)
 697                 psb_mmu_flush_ptes(pd, f_address, num_pages,
 698                                    desired_tile_stride, hw_tile_stride);
 699
 700         /* up_read(&pd->driver->sem); */
 701
 702         if (pd->hw_context != -1)
 703                 psb_mmu_flush(pd->driver, 0);
 704 }
 705
 706 int psb_mmu_insert_pfn_sequence(struct psb_mmu_pd *pd, uint32_t start_pfn,
 707                                 unsigned long address, uint32_t num_pages,
 708                                 int type)
 709 {
 710         struct psb_mmu_pt *pt;
 711         uint32_t pte;
 712         unsigned long addr;
 713         unsigned long end;
 714         unsigned long next;
 715         unsigned long f_address = address;
 716         int ret = 0;
 717
 718         down_read(&pd->driver->sem);
 719
 720         addr = address;
 721         end = addr + (num_pages << PAGE_SHIFT);
 722
 723         do {
 724                 next = psb_pd_addr_end(addr, end);
 725                 pt = psb_mmu_pt_alloc_map_lock(pd, addr);
 726                 if (!pt) {
 727                         ret = -ENOMEM;
 728                         goto out;
 729                 }
 730                 do {
 731                         pte = psb_mmu_mask_pte(start_pfn++, type);
 732                         psb_mmu_set_pte(pt, addr, pte);
 733                         pt->count++;
 734                 } while (addr += PAGE_SIZE, addr < next);
 735                 psb_mmu_pt_unmap_unlock(pt);
 736
 737         } while (addr = next, next != end);
 738
 739 out:
 740         if (pd->hw_context != -1)
 741                 psb_mmu_flush_ptes(pd, f_address, num_pages, 1, 1);
 742
 743         up_read(&pd->driver->sem);
 744
 745         if (pd->hw_context != -1)
 746                 psb_mmu_flush(pd->driver, 1);
 747
 748         return ret;
 749 }
 750
 751 int psb_mmu_insert_pages(struct psb_mmu_pd *pd, struct page **pages,
 752                          unsigned long address, uint32_t num_pages,
 753                          uint32_t desired_tile_stride,
 754                          uint32_t hw_tile_stride, int type)
 755 {
 756         struct psb_mmu_pt *pt;
 757         uint32_t rows = 1;
 758         uint32_t i;
 759         uint32_t pte;
 760         unsigned long addr;
 761         unsigned long end;
 762         unsigned long next;
 763         unsigned long add;
 764         unsigned long row_add;
 765         unsigned long f_address = address;
 766         int ret = 0;
 767
 768         if (hw_tile_stride) {
 769                 if (num_pages % desired_tile_stride != 0)
 770                         return -EINVAL;
 771                 rows = num_pages / desired_tile_stride;
 772         } else {
 773                 desired_tile_stride = num_pages;
 774         }
 775
 776         add = desired_tile_stride << PAGE_SHIFT;
 777         row_add = hw_tile_stride << PAGE_SHIFT;
 778
 779         down_read(&pd->driver->sem);
 780
 781         for (i = 0; i < rows; ++i) {
 782
 783                 addr = address;
 784                 end = addr + add;
 785
 786                 do {
 787                         next = psb_pd_addr_end(addr, end);
 788                         pt = psb_mmu_pt_alloc_map_lock(pd, addr);
 789                         if (!pt) {
 790                                 ret = -ENOMEM;
 791                                 goto out;
 792                         }
 793                         do {
 794                                 pte =
 795                                     psb_mmu_mask_pte(page_to_pfn(*pages++),
 796                                                      type);
 797                                 psb_mmu_set_pte(pt, addr, pte);
 798                                 pt->count++;
 799                         } while (addr += PAGE_SIZE, addr < next);
 800                         psb_mmu_pt_unmap_unlock(pt);
 801
 802                 } while (addr = next, next != end);
 803
 804                 address += row_add;
 805         }
 806 out:
 807         if (pd->hw_context != -1)
 808                 psb_mmu_flush_ptes(pd, f_address, num_pages,
 809                                    desired_tile_stride, hw_tile_stride);
 810
 811         up_read(&pd->driver->sem);
 812
 813         if (pd->hw_context != -1)
 814                 psb_mmu_flush(pd->driver, 1);
 815
 816         return ret;
 817 }
 818
 819 int psb_mmu_virtual_to_pfn(struct psb_mmu_pd *pd, uint32_t virtual,
 820                            unsigned long *pfn)
 821 {
 822         int ret;
 823         struct psb_mmu_pt *pt;
 824         uint32_t tmp;
 825         spinlock_t *lock = &pd->driver->lock;
 826
 827         down_read(&pd->driver->sem);
 828         pt = psb_mmu_pt_map_lock(pd, virtual);
 829         if (!pt) {
 830                 uint32_t *v;
 831
 832                 spin_lock(lock);
 833                 v = kmap_atomic(pd->p, KM_USER0);
 834                 tmp = v[psb_mmu_pd_index(virtual)];
 835                 kunmap_atomic(v, KM_USER0);
 836                 spin_unlock(lock);
 837
 838                 if (tmp != pd->invalid_pde || !(tmp & PSB_PTE_VALID) ||
 839                     !(pd->invalid_pte & PSB_PTE_VALID)) {
 840                         ret = -EINVAL;
 841                         goto out;
 842                 }
 843                 ret = 0;
 844                 *pfn = pd->invalid_pte >> PAGE_SHIFT;
 845                 goto out;
 846         }
 847         tmp = pt->v[psb_mmu_pt_index(virtual)];
 848         if (!(tmp & PSB_PTE_VALID)) {
 849                 ret = -EINVAL;
 850         } else {
 851                 ret = 0;
 852                 *pfn = tmp >> PAGE_SHIFT;
 853         }
 854         psb_mmu_pt_unmap_unlock(pt);
 855 out:
 856         up_read(&pd->driver->sem);
 857         return ret;
 858 }