drivers/gpu/arm/mali400/r4p0_rel0/common/mali_mmu.c

   1 /*
   2  * Copyright (C) 2010-2012 ARM Limited. All rights reserved.
   3  *
   4  * This program is free software and is provided to you under the terms of the GNU General Public License version 2
   5  * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
   6  *
   7  * A copy of the licence is included with the program, and can also be obtained from Free Software
   8  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   9  */
  10
  11 #include "mali_kernel_common.h"
  12 #include "mali_osk.h"
  13 #include "mali_osk_list.h"
  14 #include "mali_ukk.h"
  15
  16 #include "mali_mmu.h"
  17 #include "mali_hw_core.h"
  18 #include "mali_group.h"
  19 #include "mali_mmu_page_directory.h"
  20
  21 /**
  22  * Size of the MMU registers in bytes
  23  */
  24 #define MALI_MMU_REGISTERS_SIZE 0x24
  25
  26 /**
  27  * MMU commands
  28  * These are the commands that can be sent
  29  * to the MMU unit.
  30  */
  31 typedef enum mali_mmu_command {
  32         MALI_MMU_COMMAND_ENABLE_PAGING = 0x00, /**< Enable paging (memory translation) */
  33         MALI_MMU_COMMAND_DISABLE_PAGING = 0x01, /**< Disable paging (memory translation) */
  34         MALI_MMU_COMMAND_ENABLE_STALL = 0x02, /**<  Enable stall on page fault */
  35         MALI_MMU_COMMAND_DISABLE_STALL = 0x03, /**< Disable stall on page fault */
  36         MALI_MMU_COMMAND_ZAP_CACHE = 0x04, /**< Zap the entire page table cache */
  37         MALI_MMU_COMMAND_PAGE_FAULT_DONE = 0x05, /**< Page fault processed */
  38         MALI_MMU_COMMAND_HARD_RESET = 0x06 /**< Reset the MMU back to power-on settings */
  39 } mali_mmu_command;
  40
  41 static void mali_mmu_probe_trigger(void *data);
  42 static _mali_osk_errcode_t mali_mmu_probe_ack(void *data);
  43
  44 MALI_STATIC_INLINE _mali_osk_errcode_t mali_mmu_raw_reset(struct mali_mmu_core *mmu);
  45
  46 /* page fault queue flush helper pages
  47  * note that the mapping pointers are currently unused outside of the initialization functions */
  48 static u32 mali_page_fault_flush_page_directory = MALI_INVALID_PAGE;
  49 static mali_io_address mali_page_fault_flush_page_directory_mapping = NULL;
  50 static u32 mali_page_fault_flush_page_table = MALI_INVALID_PAGE;
  51 static mali_io_address mali_page_fault_flush_page_table_mapping = NULL;
  52 static u32 mali_page_fault_flush_data_page = MALI_INVALID_PAGE;
  53 static mali_io_address mali_page_fault_flush_data_page_mapping = NULL;
  54
  55 /* an empty page directory (no address valid) which is active on any MMU not currently marked as in use */
  56 static u32 mali_empty_page_directory_phys   = MALI_INVALID_PAGE;
  57 static mali_io_address mali_empty_page_directory_virt = NULL;
  58
  59
  60 _mali_osk_errcode_t mali_mmu_initialize(void)
  61 {
  62         /* allocate the helper pages */
  63         mali_empty_page_directory_phys = mali_allocate_empty_page(&mali_empty_page_directory_virt);
  64         if(0 == mali_empty_page_directory_phys) {
  65                 MALI_DEBUG_PRINT_ERROR(("Mali MMU: Could not allocate empty page directory.\n"));
  66                 mali_empty_page_directory_phys = MALI_INVALID_PAGE;
  67                 return _MALI_OSK_ERR_NOMEM;
  68         }
  69
  70         if (_MALI_OSK_ERR_OK != mali_create_fault_flush_pages(&mali_page_fault_flush_page_directory,
  71                 &mali_page_fault_flush_page_directory_mapping,
  72                 &mali_page_fault_flush_page_table,
  73                 &mali_page_fault_flush_page_table_mapping,
  74                 &mali_page_fault_flush_data_page,
  75                 &mali_page_fault_flush_data_page_mapping)) {
  76                 MALI_DEBUG_PRINT_ERROR(("Mali MMU: Could not allocate fault flush pages\n"));
  77                 mali_free_empty_page(mali_empty_page_directory_phys, mali_empty_page_directory_virt);
  78                 mali_empty_page_directory_phys = MALI_INVALID_PAGE;
  79                 mali_empty_page_directory_virt = NULL;
  80                 return _MALI_OSK_ERR_NOMEM;
  81         }
  82
  83         return _MALI_OSK_ERR_OK;
  84 }
  85
  86 void mali_mmu_terminate(void)
  87 {
  88         MALI_DEBUG_PRINT(3, ("Mali MMU: terminating\n"));
  89
  90         /* Free global helper pages */
  91         mali_free_empty_page(mali_empty_page_directory_phys, mali_empty_page_directory_virt);
  92         mali_empty_page_directory_phys = MALI_INVALID_PAGE;
  93         mali_empty_page_directory_virt = NULL;
  94
  95         /* Free the page fault flush pages */
  96         mali_destroy_fault_flush_pages(&mali_page_fault_flush_page_directory, &mali_page_fault_flush_page_directory_mapping,
  97                                        &mali_page_fault_flush_page_table, &mali_page_fault_flush_page_table_mapping,
  98                                        &mali_page_fault_flush_data_page, &mali_page_fault_flush_data_page_mapping);
  99 }
 100
 101 struct mali_mmu_core *mali_mmu_create(_mali_osk_resource_t *resource, struct mali_group *group, mali_bool is_virtual)
 102 {
 103         struct mali_mmu_core* mmu = NULL;
 104
 105         MALI_DEBUG_ASSERT_POINTER(resource);
 106
 107         MALI_DEBUG_PRINT(2, ("Mali MMU: Creating Mali MMU: %s\n", resource->description));
 108
 109         mmu = _mali_osk_calloc(1,sizeof(struct mali_mmu_core));
 110         if (NULL != mmu) {
 111                 if (_MALI_OSK_ERR_OK == mali_hw_core_create(&mmu->hw_core, resource, MALI_MMU_REGISTERS_SIZE)) {
 112                         if (_MALI_OSK_ERR_OK == mali_group_add_mmu_core(group, mmu)) {
 113                                 if (is_virtual) {
 114                                         /* Skip reset and IRQ setup for virtual MMU */
 115                                         return mmu;
 116                                 }
 117
 118                                 if (_MALI_OSK_ERR_OK == mali_mmu_reset(mmu)) {
 119                                         /* Setup IRQ handlers (which will do IRQ probing if needed) */
 120                                         mmu->irq = _mali_osk_irq_init(resource->irq,
 121                                                                       mali_group_upper_half_mmu,
 122                                                                       group,
 123                                                                       mali_mmu_probe_trigger,
 124                                                                       mali_mmu_probe_ack,
 125                                                                       mmu,
 126                                                                       resource->description);
 127                                         if (NULL != mmu->irq) {
 128                                                 return mmu;
 129                                         } else {
 130                                                 MALI_PRINT_ERROR(("Mali MMU: Failed to setup interrupt handlers for MMU %s\n", mmu->hw_core.description));
 131                                         }
 132                                 }
 133                                 mali_group_remove_mmu_core(group);
 134                         } else {
 135                                 MALI_PRINT_ERROR(("Mali MMU: Failed to add core %s to group\n", mmu->hw_core.description));
 136                         }
 137                         mali_hw_core_delete(&mmu->hw_core);
 138                 }
 139
 140                 _mali_osk_free(mmu);
 141         } else {
 142                 MALI_PRINT_ERROR(("Failed to allocate memory for MMU\n"));
 143         }
 144
 145         return NULL;
 146 }
 147
 148 void mali_mmu_delete(struct mali_mmu_core *mmu)
 149 {
 150         if (NULL != mmu->irq) {
 151                 _mali_osk_irq_term(mmu->irq);
 152         }
 153
 154         mali_hw_core_delete(&mmu->hw_core);
 155         _mali_osk_free(mmu);
 156 }
 157
 158 static void mali_mmu_enable_paging(struct mali_mmu_core *mmu)
 159 {
 160         int i;
 161
 162         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ENABLE_PAGING);
 163
 164         for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i) {
 165                 if (mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS) & MALI_MMU_STATUS_BIT_PAGING_ENABLED) {
 166                         break;
 167                 }
 168         }
 169         if (MALI_REG_POLL_COUNT_FAST == i) {
 170                 MALI_PRINT_ERROR(("Enable paging request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
 171         }
 172 }
 173
 174 /**
 175  * Issues the enable stall command to the MMU and waits for HW to complete the request
 176  * @param mmu The MMU to enable paging for
 177  * @return MALI_TRUE if HW stall was successfully engaged, otherwise MALI_FALSE (req timed out)
 178  */
 179 static mali_bool mali_mmu_enable_stall(struct mali_mmu_core *mmu)
 180 {
 181         int i;
 182         u32 mmu_status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
 183
 184         if ( 0 == (mmu_status & MALI_MMU_STATUS_BIT_PAGING_ENABLED) ) {
 185                 MALI_DEBUG_PRINT(4, ("MMU stall is implicit when Paging is not enabled.\n"));
 186                 return MALI_TRUE;
 187         }
 188
 189         if ( mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE ) {
 190                 MALI_DEBUG_PRINT(3, ("Aborting MMU stall request since it is in pagefault state.\n"));
 191                 return MALI_FALSE;
 192         }
 193
 194         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ENABLE_STALL);
 195
 196         for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i) {
 197                 mmu_status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
 198                 if (mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE) {
 199                         break;
 200                 }
 201                 if ((mmu_status & MALI_MMU_STATUS_BIT_STALL_ACTIVE) && (0 == (mmu_status & MALI_MMU_STATUS_BIT_STALL_NOT_ACTIVE))) {
 202                         break;
 203                 }
 204                 if (0 == (mmu_status & ( MALI_MMU_STATUS_BIT_PAGING_ENABLED ))) {
 205                         break;
 206                 }
 207         }
 208         if (MALI_REG_POLL_COUNT_FAST == i) {
 209                 MALI_DEBUG_PRINT(2, ("Enable stall request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
 210                 return MALI_FALSE;
 211         }
 212
 213         if ( mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE ) {
 214                 MALI_DEBUG_PRINT(2, ("Aborting MMU stall request since it has a pagefault.\n"));
 215                 return MALI_FALSE;
 216         }
 217
 218         return MALI_TRUE;
 219 }
 220
 221 /**
 222  * Issues the disable stall command to the MMU and waits for HW to complete the request
 223  * @param mmu The MMU to enable paging for
 224  */
 225 static void mali_mmu_disable_stall(struct mali_mmu_core *mmu)
 226 {
 227         int i;
 228         u32 mmu_status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
 229
 230         if ( 0 == (mmu_status & MALI_MMU_STATUS_BIT_PAGING_ENABLED )) {
 231                 MALI_DEBUG_PRINT(3, ("MMU disable skipped since it was not enabled.\n"));
 232                 return;
 233         }
 234         if (mmu_status & MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE) {
 235                 MALI_DEBUG_PRINT(2, ("Aborting MMU disable stall request since it is in pagefault state.\n"));
 236                 return;
 237         }
 238
 239         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_DISABLE_STALL);
 240
 241         for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i) {
 242                 u32 status = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS);
 243                 if ( 0 == (status & MALI_MMU_STATUS_BIT_STALL_ACTIVE) ) {
 244                         break;
 245                 }
 246                 if ( status &  MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE ) {
 247                         break;
 248                 }
 249                 if ( 0 == (mmu_status & MALI_MMU_STATUS_BIT_PAGING_ENABLED )) {
 250                         break;
 251                 }
 252         }
 253         if (MALI_REG_POLL_COUNT_FAST == i) MALI_DEBUG_PRINT(1,("Disable stall request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
 254 }
 255
 256 void mali_mmu_page_fault_done(struct mali_mmu_core *mmu)
 257 {
 258         MALI_DEBUG_PRINT(4, ("Mali MMU: %s: Leaving page fault mode\n", mmu->hw_core.description));
 259         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_PAGE_FAULT_DONE);
 260 }
 261
 262 MALI_STATIC_INLINE _mali_osk_errcode_t mali_mmu_raw_reset(struct mali_mmu_core *mmu)
 263 {
 264         int i;
 265
 266         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR, 0xCAFEBABE);
 267         MALI_DEBUG_ASSERT(0xCAFEB000 == mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR));
 268         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_HARD_RESET);
 269
 270         for (i = 0; i < MALI_REG_POLL_COUNT_FAST; ++i) {
 271                 if (mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR) == 0) {
 272                         break;
 273                 }
 274         }
 275         if (MALI_REG_POLL_COUNT_FAST == i) {
 276                 MALI_PRINT_ERROR(("Reset request failed, MMU status is 0x%08X\n", mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
 277                 return _MALI_OSK_ERR_FAULT;
 278         }
 279
 280         return _MALI_OSK_ERR_OK;
 281 }
 282
 283 _mali_osk_errcode_t mali_mmu_reset(struct mali_mmu_core *mmu)
 284 {
 285         _mali_osk_errcode_t err = _MALI_OSK_ERR_FAULT;
 286         mali_bool stall_success;
 287         MALI_DEBUG_ASSERT_POINTER(mmu);
 288
 289         stall_success = mali_mmu_enable_stall(mmu);
 290         if (!stall_success) {
 291                 err = _MALI_OSK_ERR_BUSY;
 292         }
 293
 294         MALI_DEBUG_PRINT(3, ("Mali MMU: mali_kernel_mmu_reset: %s\n", mmu->hw_core.description));
 295
 296         if (_MALI_OSK_ERR_OK == mali_mmu_raw_reset(mmu)) {
 297                 mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_MASK, MALI_MMU_INTERRUPT_PAGE_FAULT | MALI_MMU_INTERRUPT_READ_BUS_ERROR);
 298                 /* no session is active, so just activate the empty page directory */
 299                 mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR, mali_empty_page_directory_phys);
 300                 mali_mmu_enable_paging(mmu);
 301                 err = _MALI_OSK_ERR_OK;
 302         }
 303         mali_mmu_disable_stall(mmu);
 304
 305         return err;
 306 }
 307
 308 mali_bool mali_mmu_zap_tlb(struct mali_mmu_core *mmu)
 309 {
 310         mali_bool stall_success = mali_mmu_enable_stall(mmu);
 311
 312         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ZAP_CACHE);
 313
 314         if (MALI_FALSE == stall_success) {
 315                 /* False means that it is in Pagefault state. Not possible to disable_stall then */
 316                 return MALI_FALSE;
 317         }
 318
 319         mali_mmu_disable_stall(mmu);
 320         return MALI_TRUE;
 321 }
 322
 323 void mali_mmu_zap_tlb_without_stall(struct mali_mmu_core *mmu)
 324 {
 325         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ZAP_CACHE);
 326 }
 327
 328
 329 void mali_mmu_invalidate_page(struct mali_mmu_core *mmu, u32 mali_address)
 330 {
 331         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_ZAP_ONE_LINE, MALI_MMU_PDE_ENTRY(mali_address));
 332 }
 333
 334 static void mali_mmu_activate_address_space(struct mali_mmu_core *mmu, u32 page_directory)
 335 {
 336         /* The MMU must be in stalled or page fault mode, for this writing to work */
 337         MALI_DEBUG_ASSERT( 0 != ( mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)
 338                                   & (MALI_MMU_STATUS_BIT_STALL_ACTIVE|MALI_MMU_STATUS_BIT_PAGE_FAULT_ACTIVE) ) );
 339         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_DTE_ADDR, page_directory);
 340         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_COMMAND, MALI_MMU_COMMAND_ZAP_CACHE);
 341
 342 }
 343
 344 void mali_mmu_activate_page_directory(struct mali_mmu_core *mmu, struct mali_page_directory *pagedir)
 345 {
 346         mali_bool stall_success;
 347         MALI_DEBUG_ASSERT_POINTER(mmu);
 348
 349         MALI_DEBUG_PRINT(5, ("Asked to activate page directory 0x%x on MMU %s\n", pagedir, mmu->hw_core.description));
 350
 351         stall_success = mali_mmu_enable_stall(mmu);
 352         MALI_DEBUG_ASSERT(stall_success);
 353         MALI_IGNORE(stall_success);
 354         mali_mmu_activate_address_space(mmu, pagedir->page_directory);
 355         mali_mmu_disable_stall(mmu);
 356 }
 357
 358 void mali_mmu_activate_empty_page_directory(struct mali_mmu_core* mmu)
 359 {
 360         mali_bool stall_success;
 361
 362         MALI_DEBUG_ASSERT_POINTER(mmu);
 363         MALI_DEBUG_PRINT(3, ("Activating the empty page directory on MMU %s\n", mmu->hw_core.description));
 364
 365         stall_success = mali_mmu_enable_stall(mmu);
 366
 367         /* This function can only be called when the core is idle, so it could not fail. */
 368         MALI_DEBUG_ASSERT(stall_success);
 369         MALI_IGNORE(stall_success);
 370
 371         mali_mmu_activate_address_space(mmu, mali_empty_page_directory_phys);
 372         mali_mmu_disable_stall(mmu);
 373 }
 374
 375 void mali_mmu_activate_fault_flush_page_directory(struct mali_mmu_core* mmu)
 376 {
 377         mali_bool stall_success;
 378         MALI_DEBUG_ASSERT_POINTER(mmu);
 379
 380         MALI_DEBUG_PRINT(3, ("Activating the page fault flush page directory on MMU %s\n", mmu->hw_core.description));
 381         stall_success = mali_mmu_enable_stall(mmu);
 382         /* This function is expect to fail the stalling, since it might be in PageFault mode when it is called */
 383         mali_mmu_activate_address_space(mmu, mali_page_fault_flush_page_directory);
 384         if ( MALI_TRUE==stall_success ) mali_mmu_disable_stall(mmu);
 385 }
 386
 387 /* Is called when we want the mmu to give an interrupt */
 388 static void mali_mmu_probe_trigger(void *data)
 389 {
 390         struct mali_mmu_core *mmu = (struct mali_mmu_core *)data;
 391         mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_RAWSTAT, MALI_MMU_INTERRUPT_PAGE_FAULT|MALI_MMU_INTERRUPT_READ_BUS_ERROR);
 392 }
 393
 394 /* Is called when the irq probe wants the mmu to acknowledge an interrupt from the hw */
 395 static _mali_osk_errcode_t mali_mmu_probe_ack(void *data)
 396 {
 397         struct mali_mmu_core *mmu = (struct mali_mmu_core *)data;
 398         u32 int_stat;
 399
 400         int_stat = mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_INT_STATUS);
 401
 402         MALI_DEBUG_PRINT(2, ("mali_mmu_probe_irq_acknowledge: intstat 0x%x\n", int_stat));
 403         if (int_stat & MALI_MMU_INTERRUPT_PAGE_FAULT) {
 404                 MALI_DEBUG_PRINT(2, ("Probe: Page fault detect: PASSED\n"));
 405                 mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_CLEAR, MALI_MMU_INTERRUPT_PAGE_FAULT);
 406         } else {
 407                 MALI_DEBUG_PRINT(1, ("Probe: Page fault detect: FAILED\n"));
 408         }
 409
 410         if (int_stat & MALI_MMU_INTERRUPT_READ_BUS_ERROR) {
 411                 MALI_DEBUG_PRINT(2, ("Probe: Bus read error detect: PASSED\n"));
 412                 mali_hw_core_register_write(&mmu->hw_core, MALI_MMU_REGISTER_INT_CLEAR, MALI_MMU_INTERRUPT_READ_BUS_ERROR);
 413         } else {
 414                 MALI_DEBUG_PRINT(1, ("Probe: Bus read error detect: FAILED\n"));
 415         }
 416
 417         if ( (int_stat & (MALI_MMU_INTERRUPT_PAGE_FAULT|MALI_MMU_INTERRUPT_READ_BUS_ERROR)) ==
 418              (MALI_MMU_INTERRUPT_PAGE_FAULT|MALI_MMU_INTERRUPT_READ_BUS_ERROR)) {
 419                 return _MALI_OSK_ERR_OK;
 420         }
 421
 422         return _MALI_OSK_ERR_FAULT;
 423 }
 424
 425 #if 0
 426 void mali_mmu_print_state(struct mali_mmu_core *mmu)
 427 {
 428         MALI_DEBUG_PRINT(2, ("MMU: State of %s is 0x%08x\n", mmu->hw_core.description, mali_hw_core_register_read(&mmu->hw_core, MALI_MMU_REGISTER_STATUS)));
 429 }
 430 #endif