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diff --git a/arch/powerpc/platforms/ps3/mm.c b/arch/powerpc/platforms/ps3/mm.c
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1/*
2 * PS3 address space management.
3 *
4 * Copyright (C) 2006 Sony Computer Entertainment Inc.
5 * Copyright 2006 Sony Corp.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/memory_hotplug.h>
24
25#include <asm/firmware.h>
26#include <asm/lmb.h>
27#include <asm/udbg.h>
28#include <asm/ps3.h>
29#include <asm/lv1call.h>
30
31#include "platform.h"
32
33#if defined(DEBUG)
34#define DBG(fmt...) udbg_printf(fmt)
35#else
36#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
37#endif
38
39enum {
40#if defined(CONFIG_PS3_USE_LPAR_ADDR)
41 USE_LPAR_ADDR = 1,
42#else
43 USE_LPAR_ADDR = 0,
44#endif
45#if defined(CONFIG_PS3_DYNAMIC_DMA)
46 USE_DYNAMIC_DMA = 1,
47#else
48 USE_DYNAMIC_DMA = 0,
49#endif
50};
51
52enum {
53 PAGE_SHIFT_4K = 12U,
54 PAGE_SHIFT_64K = 16U,
55 PAGE_SHIFT_16M = 24U,
56};
57
58static unsigned long make_page_sizes(unsigned long a, unsigned long b)
59{
60 return (a << 56) | (b << 48);
61}
62
63enum {
64 ALLOCATE_MEMORY_TRY_ALT_UNIT = 0X04,
65 ALLOCATE_MEMORY_ADDR_ZERO = 0X08,
66};
67
68/* valid htab sizes are {18,19,20} = 256K, 512K, 1M */
69
70enum {
71 HTAB_SIZE_MAX = 20U, /* HV limit of 1MB */
72 HTAB_SIZE_MIN = 18U, /* CPU limit of 256KB */
73};
74
75/*============================================================================*/
76/* virtual address space routines */
77/*============================================================================*/
78
79/**
80 * struct mem_region - memory region structure
81 * @base: base address
82 * @size: size in bytes
83 * @offset: difference between base and rm.size
84 */
85
86struct mem_region {
87 unsigned long base;
88 unsigned long size;
89 unsigned long offset;
90};
91
92/**
93 * struct map - address space state variables holder
94 * @total: total memory available as reported by HV
95 * @vas_id - HV virtual address space id
96 * @htab_size: htab size in bytes
97 *
98 * The HV virtual address space (vas) allows for hotplug memory regions.
99 * Memory regions can be created and destroyed in the vas at runtime.
100 * @rm: real mode (bootmem) region
101 * @r1: hotplug memory region(s)
102 *
103 * ps3 addresses
104 * virt_addr: a cpu 'translated' effective address
105 * phys_addr: an address in what Linux thinks is the physical address space
106 * lpar_addr: an address in the HV virtual address space
107 * bus_addr: an io controller 'translated' address on a device bus
108 */
109
110struct map {
111 unsigned long total;
112 unsigned long vas_id;
113 unsigned long htab_size;
114 struct mem_region rm;
115 struct mem_region r1;
116};
117
118#define debug_dump_map(x) _debug_dump_map(x, __func__, __LINE__)
119static void _debug_dump_map(const struct map* m, const char* func, int line)
120{
121 DBG("%s:%d: map.total = %lxh\n", func, line, m->total);
122 DBG("%s:%d: map.rm.size = %lxh\n", func, line, m->rm.size);
123 DBG("%s:%d: map.vas_id = %lu\n", func, line, m->vas_id);
124 DBG("%s:%d: map.htab_size = %lxh\n", func, line, m->htab_size);
125 DBG("%s:%d: map.r1.base = %lxh\n", func, line, m->r1.base);
126 DBG("%s:%d: map.r1.offset = %lxh\n", func, line, m->r1.offset);
127 DBG("%s:%d: map.r1.size = %lxh\n", func, line, m->r1.size);
128}
129
130static struct map map;
131
132/**
133 * ps3_mm_phys_to_lpar - translate a linux physical address to lpar address
134 * @phys_addr: linux physical address
135 */
136
137unsigned long ps3_mm_phys_to_lpar(unsigned long phys_addr)
138{
139 BUG_ON(is_kernel_addr(phys_addr));
140 if (USE_LPAR_ADDR)
141 return phys_addr;
142 else
143 return (phys_addr < map.rm.size || phys_addr >= map.total)
144 ? phys_addr : phys_addr + map.r1.offset;
145}
146
147EXPORT_SYMBOL(ps3_mm_phys_to_lpar);
148
149/**
150 * ps3_mm_vas_create - create the virtual address space
151 */
152
153void __init ps3_mm_vas_create(unsigned long* htab_size)
154{
155 int result;
156 unsigned long start_address;
157 unsigned long size;
158 unsigned long access_right;
159 unsigned long max_page_size;
160 unsigned long flags;
161
162 result = lv1_query_logical_partition_address_region_info(0,
163 &start_address, &size, &access_right, &max_page_size,
164 &flags);
165
166 if (result) {
167 DBG("%s:%d: lv1_query_logical_partition_address_region_info "
168 "failed: %s\n", __func__, __LINE__,
169 ps3_result(result));
170 goto fail;
171 }
172
173 if (max_page_size < PAGE_SHIFT_16M) {
174 DBG("%s:%d: bad max_page_size %lxh\n", __func__, __LINE__,
175 max_page_size);
176 goto fail;
177 }
178
179 BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE > HTAB_SIZE_MAX);
180 BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE < HTAB_SIZE_MIN);
181
182 result = lv1_construct_virtual_address_space(CONFIG_PS3_HTAB_SIZE,
183 2, make_page_sizes(PAGE_SHIFT_16M, PAGE_SHIFT_64K),
184 &map.vas_id, &map.htab_size);
185
186 if (result) {
187 DBG("%s:%d: lv1_construct_virtual_address_space failed: %s\n",
188 __func__, __LINE__, ps3_result(result));
189 goto fail;
190 }
191
192 result = lv1_select_virtual_address_space(map.vas_id);
193
194 if (result) {
195 DBG("%s:%d: lv1_select_virtual_address_space failed: %s\n",
196 __func__, __LINE__, ps3_result(result));
197 goto fail;
198 }
199
200 *htab_size = map.htab_size;
201
202 debug_dump_map(&map);
203
204 return;
205
206fail:
207 panic("ps3_mm_vas_create failed");
208}
209
210/**
211 * ps3_mm_vas_destroy -
212 */
213
214void ps3_mm_vas_destroy(void)
215{
216 if (map.vas_id) {
217 lv1_select_virtual_address_space(0);
218 lv1_destruct_virtual_address_space(map.vas_id);
219 map.vas_id = 0;
220 }
221}
222
223/*============================================================================*/
224/* memory hotplug routines */
225/*============================================================================*/
226
227/**
228 * ps3_mm_region_create - create a memory region in the vas
229 * @r: pointer to a struct mem_region to accept initialized values
230 * @size: requested region size
231 *
232 * This implementation creates the region with the vas large page size.
233 * @size is rounded down to a multiple of the vas large page size.
234 */
235
236int ps3_mm_region_create(struct mem_region *r, unsigned long size)
237{
238 int result;
239 unsigned long muid;
240
241 r->size = _ALIGN_DOWN(size, 1 << PAGE_SHIFT_16M);
242
243 DBG("%s:%d requested %lxh\n", __func__, __LINE__, size);
244 DBG("%s:%d actual %lxh\n", __func__, __LINE__, r->size);
245 DBG("%s:%d difference %lxh (%luMB)\n", __func__, __LINE__,
246 (unsigned long)(size - r->size),
247 (size - r->size) / 1024 / 1024);
248
249 if (r->size == 0) {
250 DBG("%s:%d: size == 0\n", __func__, __LINE__);
251 result = -1;
252 goto zero_region;
253 }
254
255 result = lv1_allocate_memory(r->size, PAGE_SHIFT_16M, 0,
256 ALLOCATE_MEMORY_TRY_ALT_UNIT, &r->base, &muid);
257
258 if (result || r->base < map.rm.size) {
259 DBG("%s:%d: lv1_allocate_memory failed: %s\n",
260 __func__, __LINE__, ps3_result(result));
261 goto zero_region;
262 }
263
264 r->offset = r->base - map.rm.size;
265 return result;
266
267zero_region:
268 r->size = r->base = r->offset = 0;
269 return result;
270}
271
272/**
273 * ps3_mm_region_destroy - destroy a memory region
274 * @r: pointer to struct mem_region
275 */
276
277void ps3_mm_region_destroy(struct mem_region *r)
278{
279 if (r->base) {
280 lv1_release_memory(r->base);
281 r->size = r->base = r->offset = 0;
282 map.total = map.rm.size;
283 }
284}
285
286/**
287 * ps3_mm_add_memory - hot add memory
288 */
289
290static int __init ps3_mm_add_memory(void)
291{
292 int result;
293 unsigned long start_addr;
294 unsigned long start_pfn;
295 unsigned long nr_pages;
296
297 if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
298 return 0;
299
300 BUG_ON(!mem_init_done);
301
302 start_addr = USE_LPAR_ADDR ? map.r1.base : map.rm.size;
303 start_pfn = start_addr >> PAGE_SHIFT;
304 nr_pages = (map.r1.size + PAGE_SIZE - 1) >> PAGE_SHIFT;
305
306 DBG("%s:%d: start_addr %lxh, start_pfn %lxh, nr_pages %lxh\n",
307 __func__, __LINE__, start_addr, start_pfn, nr_pages);
308
309 result = add_memory(0, start_addr, map.r1.size);
310
311 if (result) {
312 DBG("%s:%d: add_memory failed: (%d)\n",
313 __func__, __LINE__, result);
314 return result;
315 }
316
317 result = online_pages(start_pfn, nr_pages);
318
319 if (result)
320 DBG("%s:%d: online_pages failed: (%d)\n",
321 __func__, __LINE__, result);
322
323 return result;
324}
325
326core_initcall(ps3_mm_add_memory);
327
328/*============================================================================*/
329/* dma routines */
330/*============================================================================*/
331
332/**
333 * dma_lpar_to_bus - Translate an lpar address to ioc mapped bus address.
334 * @r: pointer to dma region structure
335 * @lpar_addr: HV lpar address
336 */
337
338static unsigned long dma_lpar_to_bus(struct ps3_dma_region *r,
339 unsigned long lpar_addr)
340{
341 BUG_ON(lpar_addr >= map.r1.base + map.r1.size);
342 return r->bus_addr + (lpar_addr <= map.rm.size ? lpar_addr
343 : lpar_addr - map.r1.offset);
344}
345
346#define dma_dump_region(_a) _dma_dump_region(_a, __func__, __LINE__)
347static void _dma_dump_region(const struct ps3_dma_region *r, const char* func,
348 int line)
349{
350 DBG("%s:%d: dev %u:%u\n", func, line, r->did.bus_id,
351 r->did.dev_id);
352 DBG("%s:%d: page_size %u\n", func, line, r->page_size);
353 DBG("%s:%d: bus_addr %lxh\n", func, line, r->bus_addr);
354 DBG("%s:%d: len %lxh\n", func, line, r->len);
355}
356
357/**
358 * dma_chunk - A chunk of dma pages mapped by the io controller.
359 * @region - The dma region that owns this chunk.
360 * @lpar_addr: Starting lpar address of the area to map.
361 * @bus_addr: Starting ioc bus address of the area to map.
362 * @len: Length in bytes of the area to map.
363 * @link: A struct list_head used with struct ps3_dma_region.chunk_list, the
364 * list of all chuncks owned by the region.
365 *
366 * This implementation uses a very simple dma page manager
367 * based on the dma_chunk structure. This scheme assumes
368 * that all drivers use very well behaved dma ops.
369 */
370
371struct dma_chunk {
372 struct ps3_dma_region *region;
373 unsigned long lpar_addr;
374 unsigned long bus_addr;
375 unsigned long len;
376 struct list_head link;
377 unsigned int usage_count;
378};
379
380#define dma_dump_chunk(_a) _dma_dump_chunk(_a, __func__, __LINE__)
381static void _dma_dump_chunk (const struct dma_chunk* c, const char* func,
382 int line)
383{
384 DBG("%s:%d: r.dev %u:%u\n", func, line,
385 c->region->did.bus_id, c->region->did.dev_id);
386 DBG("%s:%d: r.bus_addr %lxh\n", func, line, c->region->bus_addr);
387 DBG("%s:%d: r.page_size %u\n", func, line, c->region->page_size);
388 DBG("%s:%d: r.len %lxh\n", func, line, c->region->len);
389 DBG("%s:%d: c.lpar_addr %lxh\n", func, line, c->lpar_addr);
390 DBG("%s:%d: c.bus_addr %lxh\n", func, line, c->bus_addr);
391 DBG("%s:%d: c.len %lxh\n", func, line, c->len);
392}
393
394static struct dma_chunk * dma_find_chunk(struct ps3_dma_region *r,
395 unsigned long bus_addr, unsigned long len)
396{
397 struct dma_chunk *c;
398 unsigned long aligned_bus = _ALIGN_DOWN(bus_addr, 1 << r->page_size);
399 unsigned long aligned_len = _ALIGN_UP(len, 1 << r->page_size);
400
401 list_for_each_entry(c, &r->chunk_list.head, link) {
402 /* intersection */
403 if (aligned_bus >= c->bus_addr
404 && aligned_bus < c->bus_addr + c->len
405 && aligned_bus + aligned_len <= c->bus_addr + c->len) {
406 return c;
407 }
408 /* below */
409 if (aligned_bus + aligned_len <= c->bus_addr) {
410 continue;
411 }
412 /* above */
413 if (aligned_bus >= c->bus_addr + c->len) {
414 continue;
415 }
416
417 /* we don't handle the multi-chunk case for now */
418
419 dma_dump_chunk(c);
420 BUG();
421 }
422 return NULL;
423}
424
425static int dma_free_chunk(struct dma_chunk *c)
426{
427 int result = 0;
428
429 if (c->bus_addr) {
430 result = lv1_unmap_device_dma_region(c->region->did.bus_id,
431 c->region->did.dev_id, c->bus_addr, c->len);
432 BUG_ON(result);
433 }
434
435 kfree(c);
436 return result;
437}
438
439/**
440 * dma_map_pages - Maps dma pages into the io controller bus address space.
441 * @r: Pointer to a struct ps3_dma_region.
442 * @phys_addr: Starting physical address of the area to map.
443 * @len: Length in bytes of the area to map.
444 * c_out: A pointer to receive an allocated struct dma_chunk for this area.
445 *
446 * This is the lowest level dma mapping routine, and is the one that will
447 * make the HV call to add the pages into the io controller address space.
448 */
449
450static int dma_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
451 unsigned long len, struct dma_chunk **c_out)
452{
453 int result;
454 struct dma_chunk *c;
455
456 c = kzalloc(sizeof(struct dma_chunk), GFP_ATOMIC);
457
458 if (!c) {
459 result = -ENOMEM;
460 goto fail_alloc;
461 }
462
463 c->region = r;
464 c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
465 c->bus_addr = dma_lpar_to_bus(r, c->lpar_addr);
466 c->len = len;
467
468 result = lv1_map_device_dma_region(c->region->did.bus_id,
469 c->region->did.dev_id, c->lpar_addr, c->bus_addr, c->len,
470 0xf800000000000000UL);
471
472 if (result) {
473 DBG("%s:%d: lv1_map_device_dma_region failed: %s\n",
474 __func__, __LINE__, ps3_result(result));
475 goto fail_map;
476 }
477
478 list_add(&c->link, &r->chunk_list.head);
479
480 *c_out = c;
481 return 0;
482
483fail_map:
484 kfree(c);
485fail_alloc:
486 *c_out = NULL;
487 DBG(" <- %s:%d\n", __func__, __LINE__);
488 return result;
489}
490
491/**
492 * dma_region_create - Create a device dma region.
493 * @r: Pointer to a struct ps3_dma_region.
494 *
495 * This is the lowest level dma region create routine, and is the one that
496 * will make the HV call to create the region.
497 */
498
499static int dma_region_create(struct ps3_dma_region* r)
500{
501 int result;
502
503 r->len = _ALIGN_UP(map.total, 1 << r->page_size);
504 INIT_LIST_HEAD(&r->chunk_list.head);
505 spin_lock_init(&r->chunk_list.lock);
506
507 result = lv1_allocate_device_dma_region(r->did.bus_id, r->did.dev_id,
508 r->len, r->page_size, r->region_type, &r->bus_addr);
509
510 dma_dump_region(r);
511
512 if (result) {
513 DBG("%s:%d: lv1_allocate_device_dma_region failed: %s\n",
514 __func__, __LINE__, ps3_result(result));
515 r->len = r->bus_addr = 0;
516 }
517
518 return result;
519}
520
521/**
522 * dma_region_free - Free a device dma region.
523 * @r: Pointer to a struct ps3_dma_region.
524 *
525 * This is the lowest level dma region free routine, and is the one that
526 * will make the HV call to free the region.
527 */
528
529static int dma_region_free(struct ps3_dma_region* r)
530{
531 int result;
532 struct dma_chunk *c;
533 struct dma_chunk *tmp;
534
535 list_for_each_entry_safe(c, tmp, &r->chunk_list.head, link) {
536 list_del(&c->link);
537 dma_free_chunk(c);
538 }
539
540 result = lv1_free_device_dma_region(r->did.bus_id, r->did.dev_id,
541 r->bus_addr);
542
543 if (result)
544 DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
545 __func__, __LINE__, ps3_result(result));
546
547 r->len = r->bus_addr = 0;
548
549 return result;
550}
551
552/**
553 * dma_map_area - Map an area of memory into a device dma region.
554 * @r: Pointer to a struct ps3_dma_region.
555 * @virt_addr: Starting virtual address of the area to map.
556 * @len: Length in bytes of the area to map.
557 * @bus_addr: A pointer to return the starting ioc bus address of the area to
558 * map.
559 *
560 * This is the common dma mapping routine.
561 */
562
563static int dma_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
564 unsigned long len, unsigned long *bus_addr)
565{
566 int result;
567 unsigned long flags;
568 struct dma_chunk *c;
569 unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
570 : virt_addr;
571
572 *bus_addr = dma_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
573
574 if (!USE_DYNAMIC_DMA) {
575 unsigned long lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
576 DBG(" -> %s:%d\n", __func__, __LINE__);
577 DBG("%s:%d virt_addr %lxh\n", __func__, __LINE__,
578 virt_addr);
579 DBG("%s:%d phys_addr %lxh\n", __func__, __LINE__,
580 phys_addr);
581 DBG("%s:%d lpar_addr %lxh\n", __func__, __LINE__,
582 lpar_addr);
583 DBG("%s:%d len %lxh\n", __func__, __LINE__, len);
584 DBG("%s:%d bus_addr %lxh (%lxh)\n", __func__, __LINE__,
585 *bus_addr, len);
586 }
587
588 spin_lock_irqsave(&r->chunk_list.lock, flags);
589 c = dma_find_chunk(r, *bus_addr, len);
590
591 if (c) {
592 c->usage_count++;
593 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
594 return 0;
595 }
596
597 result = dma_map_pages(r, _ALIGN_DOWN(phys_addr, 1 << r->page_size),
598 _ALIGN_UP(len, 1 << r->page_size), &c);
599
600 if (result) {
601 *bus_addr = 0;
602 DBG("%s:%d: dma_map_pages failed (%d)\n",
603 __func__, __LINE__, result);
604 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
605 return result;
606 }
607
608 c->usage_count = 1;
609
610 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
611 return result;
612}
613
614/**
615 * dma_unmap_area - Unmap an area of memory from a device dma region.
616 * @r: Pointer to a struct ps3_dma_region.
617 * @bus_addr: The starting ioc bus address of the area to unmap.
618 * @len: Length in bytes of the area to unmap.
619 *
620 * This is the common dma unmap routine.
621 */
622
623int dma_unmap_area(struct ps3_dma_region *r, unsigned long bus_addr,
624 unsigned long len)
625{
626 unsigned long flags;
627 struct dma_chunk *c;
628
629 spin_lock_irqsave(&r->chunk_list.lock, flags);
630 c = dma_find_chunk(r, bus_addr, len);
631
632 if (!c) {
633 unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
634 1 << r->page_size);
635 unsigned long aligned_len = _ALIGN_UP(len, 1 << r->page_size);
636 DBG("%s:%d: not found: bus_addr %lxh\n",
637 __func__, __LINE__, bus_addr);
638 DBG("%s:%d: not found: len %lxh\n",
639 __func__, __LINE__, len);
640 DBG("%s:%d: not found: aligned_bus %lxh\n",
641 __func__, __LINE__, aligned_bus);
642 DBG("%s:%d: not found: aligned_len %lxh\n",
643 __func__, __LINE__, aligned_len);
644 BUG();
645 }
646
647 c->usage_count--;
648
649 if (!c->usage_count) {
650 list_del(&c->link);
651 dma_free_chunk(c);
652 }
653
654 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
655 return 0;
656}
657
658/**
659 * dma_region_create_linear - Setup a linear dma maping for a device.
660 * @r: Pointer to a struct ps3_dma_region.
661 *
662 * This routine creates an HV dma region for the device and maps all available
663 * ram into the io controller bus address space.
664 */
665
666static int dma_region_create_linear(struct ps3_dma_region *r)
667{
668 int result;
669 unsigned long tmp;
670
671 /* force 16M dma pages for linear mapping */
672
673 if (r->page_size != PS3_DMA_16M) {
674 pr_info("%s:%d: forcing 16M pages for linear map\n",
675 __func__, __LINE__);
676 r->page_size = PS3_DMA_16M;
677 }
678
679 result = dma_region_create(r);
680 BUG_ON(result);
681
682 result = dma_map_area(r, map.rm.base, map.rm.size, &tmp);
683 BUG_ON(result);
684
685 if (USE_LPAR_ADDR)
686 result = dma_map_area(r, map.r1.base, map.r1.size,
687 &tmp);
688 else
689 result = dma_map_area(r, map.rm.size, map.r1.size,
690 &tmp);
691
692 BUG_ON(result);
693
694 return result;
695}
696
697/**
698 * dma_region_free_linear - Free a linear dma mapping for a device.
699 * @r: Pointer to a struct ps3_dma_region.
700 *
701 * This routine will unmap all mapped areas and free the HV dma region.
702 */
703
704static int dma_region_free_linear(struct ps3_dma_region *r)
705{
706 int result;
707
708 result = dma_unmap_area(r, dma_lpar_to_bus(r, 0), map.rm.size);
709 BUG_ON(result);
710
711 result = dma_unmap_area(r, dma_lpar_to_bus(r, map.r1.base),
712 map.r1.size);
713 BUG_ON(result);
714
715 result = dma_region_free(r);
716 BUG_ON(result);
717
718 return result;
719}
720
721/**
722 * dma_map_area_linear - Map an area of memory into a device dma region.
723 * @r: Pointer to a struct ps3_dma_region.
724 * @virt_addr: Starting virtual address of the area to map.
725 * @len: Length in bytes of the area to map.
726 * @bus_addr: A pointer to return the starting ioc bus address of the area to
727 * map.
728 *
729 * This routine just returns the coresponding bus address. Actual mapping
730 * occurs in dma_region_create_linear().
731 */
732
733static int dma_map_area_linear(struct ps3_dma_region *r,
734 unsigned long virt_addr, unsigned long len, unsigned long *bus_addr)
735{
736 unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
737 : virt_addr;
738 *bus_addr = dma_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
739 return 0;
740}
741
742/**
743 * dma_unmap_area_linear - Unmap an area of memory from a device dma region.
744 * @r: Pointer to a struct ps3_dma_region.
745 * @bus_addr: The starting ioc bus address of the area to unmap.
746 * @len: Length in bytes of the area to unmap.
747 *
748 * This routine does nothing. Unmapping occurs in dma_region_free_linear().
749 */
750
751static int dma_unmap_area_linear(struct ps3_dma_region *r,
752 unsigned long bus_addr, unsigned long len)
753{
754 return 0;
755}
756
757int ps3_dma_region_create(struct ps3_dma_region *r)
758{
759 return (USE_DYNAMIC_DMA)
760 ? dma_region_create(r)
761 : dma_region_create_linear(r);
762}
763
764int ps3_dma_region_free(struct ps3_dma_region *r)
765{
766 return (USE_DYNAMIC_DMA)
767 ? dma_region_free(r)
768 : dma_region_free_linear(r);
769}
770
771int ps3_dma_map(struct ps3_dma_region *r, unsigned long virt_addr,
772 unsigned long len, unsigned long *bus_addr)
773{
774 return (USE_DYNAMIC_DMA)
775 ? dma_map_area(r, virt_addr, len, bus_addr)
776 : dma_map_area_linear(r, virt_addr, len, bus_addr);
777}
778
779int ps3_dma_unmap(struct ps3_dma_region *r, unsigned long bus_addr,
780 unsigned long len)
781{
782 return (USE_DYNAMIC_DMA) ? dma_unmap_area(r, bus_addr, len)
783 : dma_unmap_area_linear(r, bus_addr, len);
784}
785
786/*============================================================================*/
787/* system startup routines */
788/*============================================================================*/
789
790/**
791 * ps3_mm_init - initialize the address space state variables
792 */
793
794void __init ps3_mm_init(void)
795{
796 int result;
797
798 DBG(" -> %s:%d\n", __func__, __LINE__);
799
800 result = ps3_repository_read_mm_info(&map.rm.base, &map.rm.size,
801 &map.total);
802
803 if (result)
804 panic("ps3_repository_read_mm_info() failed");
805
806 map.rm.offset = map.rm.base;
807 map.vas_id = map.htab_size = 0;
808
809 /* this implementation assumes map.rm.base is zero */
810
811 BUG_ON(map.rm.base);
812 BUG_ON(!map.rm.size);
813
814 lmb_add(map.rm.base, map.rm.size);
815 lmb_analyze();
816
817 /* arrange to do this in ps3_mm_add_memory */
818 ps3_mm_region_create(&map.r1, map.total - map.rm.size);
819
820 DBG(" <- %s:%d\n", __func__, __LINE__);
821}
822
823/**
824 * ps3_mm_shutdown - final cleanup of address space
825 */
826
827void ps3_mm_shutdown(void)
828{
829 ps3_mm_region_destroy(&map.r1);
830 map.total = map.rm.size;
831}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-14 13:22:53 -0500