vchiq_2835_arm.c revision 290176
1/** 2 * Copyright (c) 2010-2012 Broadcom. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions, and the following disclaimer, 9 * without modification. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The names of the above-listed copyright holders may not be used 14 * to endorse or promote products derived from this software without 15 * specific prior written permission. 16 * 17 * ALTERNATIVELY, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2, as published by the Free 19 * Software Foundation. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#include <interface/compat/vchi_bsd.h> 35 36#include <sys/malloc.h> 37#include <sys/rwlock.h> 38 39#include <vm/vm.h> 40#include <vm/pmap.h> 41#include <vm/vm_extern.h> 42#include <vm/vm_kern.h> 43#include <vm/vm_map.h> 44#include <vm/vm_object.h> 45#include <vm/vm_page.h> 46#include <vm/vm_pager.h> 47#include <vm/vm_param.h> 48#include <vm/vm_phys.h> 49 50#include <machine/bus.h> 51#include <arm/broadcom/bcm2835/bcm2835_mbox.h> 52#include <arm/broadcom/bcm2835/bcm2835_vcbus.h> 53 54MALLOC_DEFINE(M_VCPAGELIST, "vcpagelist", "VideoCore pagelist memory"); 55 56#define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32) 57 58#define VCHIQ_DOORBELL_IRQ IRQ_ARM_DOORBELL_0 59#define VCHIQ_ARM_ADDRESS(x) ((void *)PHYS_TO_VCBUS(pmap_kextract((vm_offset_t)(x)))) 60 61#include "vchiq_arm.h" 62#include "vchiq_2835.h" 63#include "vchiq_connected.h" 64 65#define MAX_FRAGMENTS (VCHIQ_NUM_CURRENT_BULKS * 2) 66 67typedef struct vchiq_2835_state_struct { 68 int inited; 69 VCHIQ_ARM_STATE_T arm_state; 70} VCHIQ_2835_ARM_STATE_T; 71 72static char *g_slot_mem; 73static int g_slot_mem_size; 74vm_paddr_t g_slot_phys; 75/* BSD DMA */ 76bus_dma_tag_t bcm_slots_dma_tag; 77bus_dmamap_t bcm_slots_dma_map; 78 79static FRAGMENTS_T *g_fragments_base; 80static FRAGMENTS_T *g_free_fragments; 81struct semaphore g_free_fragments_sema; 82 83static DEFINE_SEMAPHORE(g_free_fragments_mutex); 84 85typedef struct bulkinfo_struct { 86 PAGELIST_T *pagelist; 87 bus_dma_tag_t pagelist_dma_tag; 88 bus_dmamap_t pagelist_dma_map; 89 void *buf; 90 size_t size; 91} BULKINFO_T; 92 93static int 94create_pagelist(char __user *buf, size_t count, unsigned short type, 95 struct proc *p, BULKINFO_T *bi); 96 97static void 98free_pagelist(BULKINFO_T *bi, int actual); 99 100static void 101vchiq_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err) 102{ 103 bus_addr_t *addr; 104 105 if (err) 106 return; 107 108 addr = (bus_addr_t*)arg; 109 *addr = PHYS_TO_VCBUS(segs[0].ds_addr); 110} 111 112static int 113copyout_page(vm_page_t p, size_t offset, void *kaddr, size_t size) 114{ 115 uint8_t *dst; 116 117 dst = pmap_mapdev(VM_PAGE_TO_PHYS(p), PAGE_SIZE); 118 if (!dst) 119 return ENOMEM; 120 121 memcpy(dst + offset, kaddr, size); 122 123 pmap_unmapdev((vm_offset_t)dst, PAGE_SIZE); 124 125 return 0; 126} 127 128int __init 129vchiq_platform_init(VCHIQ_STATE_T *state) 130{ 131 VCHIQ_SLOT_ZERO_T *vchiq_slot_zero; 132 int frag_mem_size; 133 int err; 134 int i; 135 136 /* Allocate space for the channels in coherent memory */ 137 g_slot_mem_size = PAGE_ALIGN(TOTAL_SLOTS * VCHIQ_SLOT_SIZE); 138 frag_mem_size = PAGE_ALIGN(sizeof(FRAGMENTS_T) * MAX_FRAGMENTS); 139 140 err = bus_dma_tag_create( 141 NULL, 142 PAGE_SIZE, 0, /* alignment, boundary */ 143 BUS_SPACE_MAXADDR_32BIT, /* lowaddr */ 144 BUS_SPACE_MAXADDR, /* highaddr */ 145 NULL, NULL, /* filter, filterarg */ 146 g_slot_mem_size + frag_mem_size, 1, /* maxsize, nsegments */ 147 g_slot_mem_size + frag_mem_size, 0, /* maxsegsize, flags */ 148 NULL, NULL, /* lockfunc, lockarg */ 149 &bcm_slots_dma_tag); 150 151 err = bus_dmamem_alloc(bcm_slots_dma_tag, (void **)&g_slot_mem, 152 BUS_DMA_COHERENT | BUS_DMA_WAITOK, &bcm_slots_dma_map); 153 if (err) { 154 vchiq_log_error(vchiq_core_log_level, "Unable to allocate channel memory"); 155 err = -ENOMEM; 156 goto failed_alloc; 157 } 158 159 err = bus_dmamap_load(bcm_slots_dma_tag, bcm_slots_dma_map, g_slot_mem, 160 g_slot_mem_size + frag_mem_size, vchiq_dmamap_cb, 161 &g_slot_phys, 0); 162 163 if (err) { 164 vchiq_log_error(vchiq_core_log_level, "cannot load DMA map"); 165 err = -ENOMEM; 166 goto failed_load; 167 } 168 169 WARN_ON(((int)g_slot_mem & (PAGE_SIZE - 1)) != 0); 170 171 vchiq_slot_zero = vchiq_init_slots(g_slot_mem, g_slot_mem_size); 172 if (!vchiq_slot_zero) { 173 err = -EINVAL; 174 goto failed_init_slots; 175 } 176 177 vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX] = 178 (int)g_slot_phys + g_slot_mem_size; 179 vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX] = 180 MAX_FRAGMENTS; 181 182 g_fragments_base = (FRAGMENTS_T *)(g_slot_mem + g_slot_mem_size); 183 g_slot_mem_size += frag_mem_size; 184 185 g_free_fragments = g_fragments_base; 186 for (i = 0; i < (MAX_FRAGMENTS - 1); i++) { 187 *(FRAGMENTS_T **)&g_fragments_base[i] = 188 &g_fragments_base[i + 1]; 189 } 190 *(FRAGMENTS_T **)&g_fragments_base[i] = NULL; 191 _sema_init(&g_free_fragments_sema, MAX_FRAGMENTS); 192 193 if (vchiq_init_state(state, vchiq_slot_zero, 0/*slave*/) != 194 VCHIQ_SUCCESS) { 195 err = -EINVAL; 196 goto failed_vchiq_init; 197 } 198 199 bcm_mbox_write(BCM2835_MBOX_CHAN_VCHIQ, (unsigned int)g_slot_phys); 200 201 vchiq_log_info(vchiq_arm_log_level, 202 "vchiq_init - done (slots %x, phys %x)", 203 (unsigned int)vchiq_slot_zero, g_slot_phys); 204 205 vchiq_call_connected_callbacks(); 206 207 return 0; 208 209failed_vchiq_init: 210failed_init_slots: 211failed_load: 212 bus_dmamap_unload(bcm_slots_dma_tag, bcm_slots_dma_map); 213failed_alloc: 214 bus_dmamap_destroy(bcm_slots_dma_tag, bcm_slots_dma_map); 215 bus_dma_tag_destroy(bcm_slots_dma_tag); 216 217 return err; 218} 219 220void __exit 221vchiq_platform_exit(VCHIQ_STATE_T *state) 222{ 223 224 bus_dmamap_unload(bcm_slots_dma_tag, bcm_slots_dma_map); 225 bus_dmamap_destroy(bcm_slots_dma_tag, bcm_slots_dma_map); 226 bus_dma_tag_destroy(bcm_slots_dma_tag); 227} 228 229VCHIQ_STATUS_T 230vchiq_platform_init_state(VCHIQ_STATE_T *state) 231{ 232 VCHIQ_STATUS_T status = VCHIQ_SUCCESS; 233 state->platform_state = kzalloc(sizeof(VCHIQ_2835_ARM_STATE_T), GFP_KERNEL); 234 ((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->inited = 1; 235 status = vchiq_arm_init_state(state, &((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->arm_state); 236 if(status != VCHIQ_SUCCESS) 237 { 238 ((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->inited = 0; 239 } 240 return status; 241} 242 243VCHIQ_ARM_STATE_T* 244vchiq_platform_get_arm_state(VCHIQ_STATE_T *state) 245{ 246 if(!((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->inited) 247 { 248 BUG(); 249 } 250 return &((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->arm_state; 251} 252 253int 254vchiq_copy_from_user(void *dst, const void *src, int size) 255{ 256 257 if (((vm_offset_t)(src)) < VM_MIN_KERNEL_ADDRESS) { 258 int error = copyin(src, dst, size); 259 return error ? VCHIQ_ERROR : VCHIQ_SUCCESS; 260 } 261 else 262 bcopy(src, dst, size); 263 264 return 0; 265} 266 267VCHIQ_STATUS_T 268vchiq_prepare_bulk_data(VCHIQ_BULK_T *bulk, VCHI_MEM_HANDLE_T memhandle, 269 void *offset, int size, int dir) 270{ 271 BULKINFO_T *bi; 272 int ret; 273 274 WARN_ON(memhandle != VCHI_MEM_HANDLE_INVALID); 275 bi = malloc(sizeof(*bi), M_VCPAGELIST, M_WAITOK | M_ZERO); 276 if (bi == NULL) 277 return VCHIQ_ERROR; 278 279 ret = create_pagelist((char __user *)offset, size, 280 (dir == VCHIQ_BULK_RECEIVE) 281 ? PAGELIST_READ 282 : PAGELIST_WRITE, 283 current, 284 bi); 285 if (ret != 0) 286 return VCHIQ_ERROR; 287 288 bulk->handle = memhandle; 289 bulk->data = VCHIQ_ARM_ADDRESS(bi->pagelist); 290 291 /* Store the pagelist address in remote_data, which isn't used by the 292 slave. */ 293 bulk->remote_data = bi; 294 295 return VCHIQ_SUCCESS; 296} 297 298void 299vchiq_complete_bulk(VCHIQ_BULK_T *bulk) 300{ 301 if (bulk && bulk->remote_data && bulk->actual) 302 free_pagelist((BULKINFO_T *)bulk->remote_data, bulk->actual); 303} 304 305void 306vchiq_transfer_bulk(VCHIQ_BULK_T *bulk) 307{ 308 /* 309 * This should only be called on the master (VideoCore) side, but 310 * provide an implementation to avoid the need for ifdefery. 311 */ 312 BUG(); 313} 314 315void 316vchiq_dump_platform_state(void *dump_context) 317{ 318 char buf[80]; 319 int len; 320 len = snprintf(buf, sizeof(buf), 321 " Platform: 2835 (VC master)"); 322 vchiq_dump(dump_context, buf, len + 1); 323} 324 325VCHIQ_STATUS_T 326vchiq_platform_suspend(VCHIQ_STATE_T *state) 327{ 328 return VCHIQ_ERROR; 329} 330 331VCHIQ_STATUS_T 332vchiq_platform_resume(VCHIQ_STATE_T *state) 333{ 334 return VCHIQ_SUCCESS; 335} 336 337void 338vchiq_platform_paused(VCHIQ_STATE_T *state) 339{ 340} 341 342void 343vchiq_platform_resumed(VCHIQ_STATE_T *state) 344{ 345} 346 347int 348vchiq_platform_videocore_wanted(VCHIQ_STATE_T* state) 349{ 350 return 1; // autosuspend not supported - videocore always wanted 351} 352 353int 354vchiq_platform_use_suspend_timer(void) 355{ 356 return 0; 357} 358void 359vchiq_dump_platform_use_state(VCHIQ_STATE_T *state) 360{ 361 vchiq_log_info(vchiq_arm_log_level, "Suspend timer not in use"); 362} 363void 364vchiq_platform_handle_timeout(VCHIQ_STATE_T *state) 365{ 366 (void)state; 367} 368/* 369 * Local functions 370 */ 371 372static void 373pagelist_page_free(vm_page_t pp) 374{ 375 vm_page_lock(pp); 376 vm_page_unwire(pp, PQ_INACTIVE); 377 if (pp->wire_count == 0 && pp->object == NULL) 378 vm_page_free(pp); 379 vm_page_unlock(pp); 380} 381 382/* There is a potential problem with partial cache lines (pages?) 383** at the ends of the block when reading. If the CPU accessed anything in 384** the same line (page?) then it may have pulled old data into the cache, 385** obscuring the new data underneath. We can solve this by transferring the 386** partial cache lines separately, and allowing the ARM to copy into the 387** cached area. 388 389** N.B. This implementation plays slightly fast and loose with the Linux 390** driver programming rules, e.g. its use of __virt_to_bus instead of 391** dma_map_single, but it isn't a multi-platform driver and it benefits 392** from increased speed as a result. 393*/ 394 395static int 396create_pagelist(char __user *buf, size_t count, unsigned short type, 397 struct proc *p, BULKINFO_T *bi) 398{ 399 PAGELIST_T *pagelist; 400 vm_page_t* pages; 401 unsigned long *addrs; 402 unsigned int num_pages, i; 403 vm_offset_t offset; 404 int pagelist_size; 405 char *addr, *base_addr, *next_addr; 406 int run, addridx, actual_pages; 407 int err; 408 vm_paddr_t pagelist_phys; 409 410 offset = (vm_offset_t)buf & (PAGE_SIZE - 1); 411 num_pages = (count + offset + PAGE_SIZE - 1) / PAGE_SIZE; 412 413 bi->pagelist = NULL; 414 bi->buf = buf; 415 bi->size = count; 416 417 /* Allocate enough storage to hold the page pointers and the page 418 ** list 419 */ 420 pagelist_size = sizeof(PAGELIST_T) + 421 (num_pages * sizeof(unsigned long)) + 422 (num_pages * sizeof(pages[0])); 423 424 err = bus_dma_tag_create( 425 NULL, 426 PAGE_SIZE, 0, /* alignment, boundary */ 427 BUS_SPACE_MAXADDR_32BIT, /* lowaddr */ 428 BUS_SPACE_MAXADDR, /* highaddr */ 429 NULL, NULL, /* filter, filterarg */ 430 pagelist_size, 1, /* maxsize, nsegments */ 431 pagelist_size, 0, /* maxsegsize, flags */ 432 NULL, NULL, /* lockfunc, lockarg */ 433 &bi->pagelist_dma_tag); 434 435 err = bus_dmamem_alloc(bi->pagelist_dma_tag, (void **)&pagelist, 436 BUS_DMA_COHERENT | BUS_DMA_WAITOK, &bi->pagelist_dma_map); 437 if (err) { 438 vchiq_log_error(vchiq_core_log_level, "Unable to allocate pagelist memory"); 439 err = -ENOMEM; 440 goto failed_alloc; 441 } 442 443 err = bus_dmamap_load(bi->pagelist_dma_tag, bi->pagelist_dma_map, pagelist, 444 pagelist_size, vchiq_dmamap_cb, 445 &pagelist_phys, 0); 446 447 if (err) { 448 vchiq_log_error(vchiq_core_log_level, "cannot load DMA map for pagelist memory"); 449 err = -ENOMEM; 450 goto failed_load; 451 } 452 453 vchiq_log_trace(vchiq_arm_log_level, 454 "create_pagelist - %x", (unsigned int)pagelist); 455 if (!pagelist) 456 return -ENOMEM; 457 458 addrs = pagelist->addrs; 459 pages = (vm_page_t*)(addrs + num_pages); 460 461 actual_pages = vm_fault_quick_hold_pages(&p->p_vmspace->vm_map, 462 (vm_offset_t)buf, count, 463 (type == PAGELIST_READ ? VM_PROT_WRITE : 0 ) | VM_PROT_READ, pages, num_pages); 464 465 if (actual_pages != num_pages) { 466 vm_page_unhold_pages(pages, actual_pages); 467 free(pagelist, M_VCPAGELIST); 468 return (-ENOMEM); 469 } 470 471 for (i = 0; i < actual_pages; i++) { 472 vm_page_lock(pages[i]); 473 vm_page_wire(pages[i]); 474 vm_page_unhold(pages[i]); 475 vm_page_unlock(pages[i]); 476 } 477 478 pagelist->length = count; 479 pagelist->type = type; 480 pagelist->offset = offset; 481 482 /* Group the pages into runs of contiguous pages */ 483 484 base_addr = (void *)PHYS_TO_VCBUS(VM_PAGE_TO_PHYS(pages[0])); 485 next_addr = base_addr + PAGE_SIZE; 486 addridx = 0; 487 run = 0; 488 489 for (i = 1; i < num_pages; i++) { 490 addr = (void *)PHYS_TO_VCBUS(VM_PAGE_TO_PHYS(pages[i])); 491 if ((addr == next_addr) && (run < (PAGE_SIZE - 1))) { 492 next_addr += PAGE_SIZE; 493 run++; 494 } else { 495 addrs[addridx] = (unsigned long)base_addr + run; 496 addridx++; 497 base_addr = addr; 498 next_addr = addr + PAGE_SIZE; 499 run = 0; 500 } 501 } 502 503 addrs[addridx] = (unsigned long)base_addr + run; 504 addridx++; 505 506 /* Partial cache lines (fragments) require special measures */ 507 if ((type == PAGELIST_READ) && 508 ((pagelist->offset & (CACHE_LINE_SIZE - 1)) || 509 ((pagelist->offset + pagelist->length) & 510 (CACHE_LINE_SIZE - 1)))) { 511 FRAGMENTS_T *fragments; 512 513 if (down_interruptible(&g_free_fragments_sema) != 0) { 514 free(pagelist, M_VCPAGELIST); 515 return -EINTR; 516 } 517 518 WARN_ON(g_free_fragments == NULL); 519 520 down(&g_free_fragments_mutex); 521 fragments = (FRAGMENTS_T *) g_free_fragments; 522 WARN_ON(fragments == NULL); 523 g_free_fragments = *(FRAGMENTS_T **) g_free_fragments; 524 up(&g_free_fragments_mutex); 525 pagelist->type = 526 PAGELIST_READ_WITH_FRAGMENTS + (fragments - 527 g_fragments_base); 528 } 529 530 cpu_dcache_wbinv_range((vm_offset_t)buf, count); 531 532 bus_dmamap_sync(bi->pagelist_dma_tag, bi->pagelist_dma_map, BUS_DMASYNC_PREWRITE); 533 534 bi->pagelist = pagelist; 535 536 return 0; 537 538failed_load: 539 bus_dmamap_unload(bi->pagelist_dma_tag, bi->pagelist_dma_map); 540failed_alloc: 541 bus_dmamap_destroy(bi->pagelist_dma_tag, bi->pagelist_dma_map); 542 bus_dma_tag_destroy(bi->pagelist_dma_tag); 543 544 return err; 545} 546 547static void 548free_pagelist(BULKINFO_T *bi, int actual) 549{ 550 vm_page_t*pages; 551 unsigned int num_pages, i; 552 PAGELIST_T *pagelist; 553 554 pagelist = bi->pagelist; 555 556 vchiq_log_trace(vchiq_arm_log_level, 557 "free_pagelist - %x, %d", (unsigned int)pagelist, actual); 558 559 num_pages = 560 (pagelist->length + pagelist->offset + PAGE_SIZE - 1) / 561 PAGE_SIZE; 562 563 pages = (vm_page_t*)(pagelist->addrs + num_pages); 564 565 /* Deal with any partial cache lines (fragments) */ 566 if (pagelist->type >= PAGELIST_READ_WITH_FRAGMENTS) { 567 FRAGMENTS_T *fragments = g_fragments_base + 568 (pagelist->type - PAGELIST_READ_WITH_FRAGMENTS); 569 int head_bytes, tail_bytes; 570 head_bytes = (CACHE_LINE_SIZE - pagelist->offset) & 571 (CACHE_LINE_SIZE - 1); 572 tail_bytes = (pagelist->offset + actual) & 573 (CACHE_LINE_SIZE - 1); 574 575 if ((actual >= 0) && (head_bytes != 0)) { 576 if (head_bytes > actual) 577 head_bytes = actual; 578 579 copyout_page(pages[0], 580 pagelist->offset, 581 fragments->headbuf, 582 head_bytes); 583 } 584 585 if ((actual >= 0) && (head_bytes < actual) && 586 (tail_bytes != 0)) { 587 588 copyout_page(pages[num_pages-1], 589 (((vm_offset_t)bi->buf + actual) % PAGE_SIZE) - tail_bytes, 590 fragments->tailbuf, 591 tail_bytes); 592 } 593 594 down(&g_free_fragments_mutex); 595 *(FRAGMENTS_T **) fragments = g_free_fragments; 596 g_free_fragments = fragments; 597 up(&g_free_fragments_mutex); 598 up(&g_free_fragments_sema); 599 } 600 601 for (i = 0; i < num_pages; i++) { 602 if (pagelist->type != PAGELIST_WRITE) { 603 vm_page_dirty(pages[i]); 604 pagelist_page_free(pages[i]); 605 } 606 } 607 608 bus_dmamap_unload(bi->pagelist_dma_tag, bi->pagelist_dma_map); 609 bus_dmamem_free(bi->pagelist_dma_tag, bi->pagelist, bi->pagelist_dma_map); 610 bus_dmamap_destroy(bi->pagelist_dma_tag, bi->pagelist_dma_map); 611 bus_dma_tag_destroy(bi->pagelist_dma_tag); 612 613 free(bi, M_VCPAGELIST); 614} 615