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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/ps3/mm.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  PS3 address space management.
  4  *
  5  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
  6  *  Copyright 2006 Sony Corp.
  7  */
  8 
  9 #include <linux/kernel.h>
 10 #include <linux/export.h>
 11 #include <linux/memblock.h>
 12 #include <linux/slab.h>
 13 
 14 #include <asm/cell-regs.h>
 15 #include <asm/firmware.h>
 16 #include <asm/prom.h>
 17 #include <asm/udbg.h>
 18 #include <asm/lv1call.h>
 19 #include <asm/setup.h>
 20 
 21 #include "platform.h"
 22 
 23 #if defined(DEBUG)
 24 #define DBG udbg_printf
 25 #else
 26 #define DBG pr_devel
 27 #endif
 28 
 29 enum {
 30 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 31         USE_DYNAMIC_DMA = 1,
 32 #else
 33         USE_DYNAMIC_DMA = 0,
 34 #endif
 35 };
 36 
 37 enum {
 38         PAGE_SHIFT_4K = 12U,
 39         PAGE_SHIFT_64K = 16U,
 40         PAGE_SHIFT_16M = 24U,
 41 };
 42 
 43 static unsigned long make_page_sizes(unsigned long a, unsigned long b)
 44 {
 45         return (a << 56) | (b << 48);
 46 }
 47 
 48 enum {
 49         ALLOCATE_MEMORY_TRY_ALT_UNIT = 0X04,
 50         ALLOCATE_MEMORY_ADDR_ZERO = 0X08,
 51 };
 52 
 53 /* valid htab sizes are {18,19,20} = 256K, 512K, 1M */
 54 
 55 enum {
 56         HTAB_SIZE_MAX = 20U, /* HV limit of 1MB */
 57         HTAB_SIZE_MIN = 18U, /* CPU limit of 256KB */
 58 };
 59 
 60 /*============================================================================*/
 61 /* virtual address space routines                                             */
 62 /*============================================================================*/
 63 
 64 /**
 65  * struct mem_region - memory region structure
 66  * @base: base address
 67  * @size: size in bytes
 68  * @offset: difference between base and rm.size
 69  * @destroy: flag if region should be destroyed upon shutdown
 70  */
 71 
 72 struct mem_region {
 73         u64 base;
 74         u64 size;
 75         unsigned long offset;
 76         int destroy;
 77 };
 78 
 79 /**
 80  * struct map - address space state variables holder
 81  * @total: total memory available as reported by HV
 82  * @vas_id - HV virtual address space id
 83  * @htab_size: htab size in bytes
 84  *
 85  * The HV virtual address space (vas) allows for hotplug memory regions.
 86  * Memory regions can be created and destroyed in the vas at runtime.
 87  * @rm: real mode (bootmem) region
 88  * @r1: highmem region(s)
 89  *
 90  * ps3 addresses
 91  * virt_addr: a cpu 'translated' effective address
 92  * phys_addr: an address in what Linux thinks is the physical address space
 93  * lpar_addr: an address in the HV virtual address space
 94  * bus_addr: an io controller 'translated' address on a device bus
 95  */
 96 
 97 struct map {
 98         u64 total;
 99         u64 vas_id;
100         u64 htab_size;
101         struct mem_region rm;
102         struct mem_region r1;
103 };
104 
105 #define debug_dump_map(x) _debug_dump_map(x, __func__, __LINE__)
106 static void __maybe_unused _debug_dump_map(const struct map *m,
107         const char *func, int line)
108 {
109         DBG("%s:%d: map.total     = %llxh\n", func, line, m->total);
110         DBG("%s:%d: map.rm.size   = %llxh\n", func, line, m->rm.size);
111         DBG("%s:%d: map.vas_id    = %llu\n", func, line, m->vas_id);
112         DBG("%s:%d: map.htab_size = %llxh\n", func, line, m->htab_size);
113         DBG("%s:%d: map.r1.base   = %llxh\n", func, line, m->r1.base);
114         DBG("%s:%d: map.r1.offset = %lxh\n", func, line, m->r1.offset);
115         DBG("%s:%d: map.r1.size   = %llxh\n", func, line, m->r1.size);
116 }
117 
118 static struct map map;
119 
120 /**
121  * ps3_mm_phys_to_lpar - translate a linux physical address to lpar address
122  * @phys_addr: linux physical address
123  */
124 
125 unsigned long ps3_mm_phys_to_lpar(unsigned long phys_addr)
126 {
127         BUG_ON(is_kernel_addr(phys_addr));
128         return (phys_addr < map.rm.size || phys_addr >= map.total)
129                 ? phys_addr : phys_addr + map.r1.offset;
130 }
131 
132 EXPORT_SYMBOL(ps3_mm_phys_to_lpar);
133 
134 /**
135  * ps3_mm_vas_create - create the virtual address space
136  */
137 
138 void __init ps3_mm_vas_create(unsigned long* htab_size)
139 {
140         int result;
141         u64 start_address;
142         u64 size;
143         u64 access_right;
144         u64 max_page_size;
145         u64 flags;
146 
147         result = lv1_query_logical_partition_address_region_info(0,
148                 &start_address, &size, &access_right, &max_page_size,
149                 &flags);
150 
151         if (result) {
152                 DBG("%s:%d: lv1_query_logical_partition_address_region_info "
153                         "failed: %s\n", __func__, __LINE__,
154                         ps3_result(result));
155                 goto fail;
156         }
157 
158         if (max_page_size < PAGE_SHIFT_16M) {
159                 DBG("%s:%d: bad max_page_size %llxh\n", __func__, __LINE__,
160                         max_page_size);
161                 goto fail;
162         }
163 
164         BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE > HTAB_SIZE_MAX);
165         BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE < HTAB_SIZE_MIN);
166 
167         result = lv1_construct_virtual_address_space(CONFIG_PS3_HTAB_SIZE,
168                         2, make_page_sizes(PAGE_SHIFT_16M, PAGE_SHIFT_64K),
169                         &map.vas_id, &map.htab_size);
170 
171         if (result) {
172                 DBG("%s:%d: lv1_construct_virtual_address_space failed: %s\n",
173                         __func__, __LINE__, ps3_result(result));
174                 goto fail;
175         }
176 
177         result = lv1_select_virtual_address_space(map.vas_id);
178 
179         if (result) {
180                 DBG("%s:%d: lv1_select_virtual_address_space failed: %s\n",
181                         __func__, __LINE__, ps3_result(result));
182                 goto fail;
183         }
184 
185         *htab_size = map.htab_size;
186 
187         debug_dump_map(&map);
188 
189         return;
190 
191 fail:
192         panic("ps3_mm_vas_create failed");
193 }
194 
195 /**
196  * ps3_mm_vas_destroy -
197  */
198 
199 void ps3_mm_vas_destroy(void)
200 {
201         int result;
202 
203         DBG("%s:%d: map.vas_id    = %llu\n", __func__, __LINE__, map.vas_id);
204 
205         if (map.vas_id) {
206                 result = lv1_select_virtual_address_space(0);
207                 BUG_ON(result);
208                 result = lv1_destruct_virtual_address_space(map.vas_id);
209                 BUG_ON(result);
210                 map.vas_id = 0;
211         }
212 }
213 
214 static int ps3_mm_get_repository_highmem(struct mem_region *r)
215 {
216         int result;
217 
218         /* Assume a single highmem region. */
219 
220         result = ps3_repository_read_highmem_info(0, &r->base, &r->size);
221 
222         if (result)
223                 goto zero_region;
224 
225         if (!r->base || !r->size) {
226                 result = -1;
227                 goto zero_region;
228         }
229 
230         r->offset = r->base - map.rm.size;
231 
232         DBG("%s:%d: Found high region in repository: %llxh %llxh\n",
233             __func__, __LINE__, r->base, r->size);
234 
235         return 0;
236 
237 zero_region:
238         DBG("%s:%d: No high region in repository.\n", __func__, __LINE__);
239 
240         r->size = r->base = r->offset = 0;
241         return result;
242 }
243 
244 static int ps3_mm_set_repository_highmem(const struct mem_region *r)
245 {
246         /* Assume a single highmem region. */
247 
248         return r ? ps3_repository_write_highmem_info(0, r->base, r->size) :
249                 ps3_repository_write_highmem_info(0, 0, 0);
250 }
251 
252 /**
253  * ps3_mm_region_create - create a memory region in the vas
254  * @r: pointer to a struct mem_region to accept initialized values
255  * @size: requested region size
256  *
257  * This implementation creates the region with the vas large page size.
258  * @size is rounded down to a multiple of the vas large page size.
259  */
260 
261 static int ps3_mm_region_create(struct mem_region *r, unsigned long size)
262 {
263         int result;
264         u64 muid;
265 
266         r->size = _ALIGN_DOWN(size, 1 << PAGE_SHIFT_16M);
267 
268         DBG("%s:%d requested  %lxh\n", __func__, __LINE__, size);
269         DBG("%s:%d actual     %llxh\n", __func__, __LINE__, r->size);
270         DBG("%s:%d difference %llxh (%lluMB)\n", __func__, __LINE__,
271                 size - r->size, (size - r->size) / 1024 / 1024);
272 
273         if (r->size == 0) {
274                 DBG("%s:%d: size == 0\n", __func__, __LINE__);
275                 result = -1;
276                 goto zero_region;
277         }
278 
279         result = lv1_allocate_memory(r->size, PAGE_SHIFT_16M, 0,
280                 ALLOCATE_MEMORY_TRY_ALT_UNIT, &r->base, &muid);
281 
282         if (result || r->base < map.rm.size) {
283                 DBG("%s:%d: lv1_allocate_memory failed: %s\n",
284                         __func__, __LINE__, ps3_result(result));
285                 goto zero_region;
286         }
287 
288         r->destroy = 1;
289         r->offset = r->base - map.rm.size;
290         return result;
291 
292 zero_region:
293         r->size = r->base = r->offset = 0;
294         return result;
295 }
296 
297 /**
298  * ps3_mm_region_destroy - destroy a memory region
299  * @r: pointer to struct mem_region
300  */
301 
302 static void ps3_mm_region_destroy(struct mem_region *r)
303 {
304         int result;
305 
306         if (!r->destroy) {
307                 pr_info("%s:%d: Not destroying high region: %llxh %llxh\n",
308                         __func__, __LINE__, r->base, r->size);
309                 return;
310         }
311 
312         DBG("%s:%d: r->base = %llxh\n", __func__, __LINE__, r->base);
313 
314         if (r->base) {
315                 result = lv1_release_memory(r->base);
316                 BUG_ON(result);
317                 r->size = r->base = r->offset = 0;
318                 map.total = map.rm.size;
319         }
320         ps3_mm_set_repository_highmem(NULL);
321 }
322 
323 /*============================================================================*/
324 /* dma routines                                                               */
325 /*============================================================================*/
326 
327 /**
328  * dma_sb_lpar_to_bus - Translate an lpar address to ioc mapped bus address.
329  * @r: pointer to dma region structure
330  * @lpar_addr: HV lpar address
331  */
332 
333 static unsigned long dma_sb_lpar_to_bus(struct ps3_dma_region *r,
334         unsigned long lpar_addr)
335 {
336         if (lpar_addr >= map.rm.size)
337                 lpar_addr -= map.r1.offset;
338         BUG_ON(lpar_addr < r->offset);
339         BUG_ON(lpar_addr >= r->offset + r->len);
340         return r->bus_addr + lpar_addr - r->offset;
341 }
342 
343 #define dma_dump_region(_a) _dma_dump_region(_a, __func__, __LINE__)
344 static void  __maybe_unused _dma_dump_region(const struct ps3_dma_region *r,
345         const char *func, int line)
346 {
347         DBG("%s:%d: dev        %llu:%llu\n", func, line, r->dev->bus_id,
348                 r->dev->dev_id);
349         DBG("%s:%d: page_size  %u\n", func, line, r->page_size);
350         DBG("%s:%d: bus_addr   %lxh\n", func, line, r->bus_addr);
351         DBG("%s:%d: len        %lxh\n", func, line, r->len);
352         DBG("%s:%d: offset     %lxh\n", func, line, r->offset);
353 }
354 
355   /**
356  * dma_chunk - A chunk of dma pages mapped by the io controller.
357  * @region - The dma region that owns this chunk.
358  * @lpar_addr: Starting lpar address of the area to map.
359  * @bus_addr: Starting ioc bus address of the area to map.
360  * @len: Length in bytes of the area to map.
361  * @link: A struct list_head used with struct ps3_dma_region.chunk_list, the
362  * list of all chuncks owned by the region.
363  *
364  * This implementation uses a very simple dma page manager
365  * based on the dma_chunk structure.  This scheme assumes
366  * that all drivers use very well behaved dma ops.
367  */
368 
369 struct dma_chunk {
370         struct ps3_dma_region *region;
371         unsigned long lpar_addr;
372         unsigned long bus_addr;
373         unsigned long len;
374         struct list_head link;
375         unsigned int usage_count;
376 };
377 
378 #define dma_dump_chunk(_a) _dma_dump_chunk(_a, __func__, __LINE__)
379 static void _dma_dump_chunk (const struct dma_chunk* c, const char* func,
380         int line)
381 {
382         DBG("%s:%d: r.dev        %llu:%llu\n", func, line,
383                 c->region->dev->bus_id, c->region->dev->dev_id);
384         DBG("%s:%d: r.bus_addr   %lxh\n", func, line, c->region->bus_addr);
385         DBG("%s:%d: r.page_size  %u\n", func, line, c->region->page_size);
386         DBG("%s:%d: r.len        %lxh\n", func, line, c->region->len);
387         DBG("%s:%d: r.offset     %lxh\n", func, line, c->region->offset);
388         DBG("%s:%d: c.lpar_addr  %lxh\n", func, line, c->lpar_addr);
389         DBG("%s:%d: c.bus_addr   %lxh\n", func, line, c->bus_addr);
390         DBG("%s:%d: c.len        %lxh\n", func, line, c->len);
391 }
392 
393 static struct dma_chunk * dma_find_chunk(struct ps3_dma_region *r,
394         unsigned long bus_addr, unsigned long len)
395 {
396         struct dma_chunk *c;
397         unsigned long aligned_bus = _ALIGN_DOWN(bus_addr, 1 << r->page_size);
398         unsigned long aligned_len = _ALIGN_UP(len+bus_addr-aligned_bus,
399                                               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 + aligned_len <= c->bus_addr + c->len)
405                         return c;
406 
407                 /* below */
408                 if (aligned_bus + aligned_len <= c->bus_addr)
409                         continue;
410 
411                 /* above */
412                 if (aligned_bus >= c->bus_addr + c->len)
413                         continue;
414 
415                 /* we don't handle the multi-chunk case for now */
416                 dma_dump_chunk(c);
417                 BUG();
418         }
419         return NULL;
420 }
421 
422 static struct dma_chunk *dma_find_chunk_lpar(struct ps3_dma_region *r,
423         unsigned long lpar_addr, unsigned long len)
424 {
425         struct dma_chunk *c;
426         unsigned long aligned_lpar = _ALIGN_DOWN(lpar_addr, 1 << r->page_size);
427         unsigned long aligned_len = _ALIGN_UP(len + lpar_addr - aligned_lpar,
428                                               1 << r->page_size);
429 
430         list_for_each_entry(c, &r->chunk_list.head, link) {
431                 /* intersection */
432                 if (c->lpar_addr <= aligned_lpar &&
433                     aligned_lpar < c->lpar_addr + c->len) {
434                         if (aligned_lpar + aligned_len <= c->lpar_addr + c->len)
435                                 return c;
436                         else {
437                                 dma_dump_chunk(c);
438                                 BUG();
439                         }
440                 }
441                 /* below */
442                 if (aligned_lpar + aligned_len <= c->lpar_addr) {
443                         continue;
444                 }
445                 /* above */
446                 if (c->lpar_addr + c->len <= aligned_lpar) {
447                         continue;
448                 }
449         }
450         return NULL;
451 }
452 
453 static int dma_sb_free_chunk(struct dma_chunk *c)
454 {
455         int result = 0;
456 
457         if (c->bus_addr) {
458                 result = lv1_unmap_device_dma_region(c->region->dev->bus_id,
459                         c->region->dev->dev_id, c->bus_addr, c->len);
460                 BUG_ON(result);
461         }
462 
463         kfree(c);
464         return result;
465 }
466 
467 static int dma_ioc0_free_chunk(struct dma_chunk *c)
468 {
469         int result = 0;
470         int iopage;
471         unsigned long offset;
472         struct ps3_dma_region *r = c->region;
473 
474         DBG("%s:start\n", __func__);
475         for (iopage = 0; iopage < (c->len >> r->page_size); iopage++) {
476                 offset = (1 << r->page_size) * iopage;
477                 /* put INVALID entry */
478                 result = lv1_put_iopte(0,
479                                        c->bus_addr + offset,
480                                        c->lpar_addr + offset,
481                                        r->ioid,
482                                        0);
483                 DBG("%s: bus=%#lx, lpar=%#lx, ioid=%d\n", __func__,
484                     c->bus_addr + offset,
485                     c->lpar_addr + offset,
486                     r->ioid);
487 
488                 if (result) {
489                         DBG("%s:%d: lv1_put_iopte failed: %s\n", __func__,
490                             __LINE__, ps3_result(result));
491                 }
492         }
493         kfree(c);
494         DBG("%s:end\n", __func__);
495         return result;
496 }
497 
498 /**
499  * dma_sb_map_pages - Maps dma pages into the io controller bus address space.
500  * @r: Pointer to a struct ps3_dma_region.
501  * @phys_addr: Starting physical address of the area to map.
502  * @len: Length in bytes of the area to map.
503  * c_out: A pointer to receive an allocated struct dma_chunk for this area.
504  *
505  * This is the lowest level dma mapping routine, and is the one that will
506  * make the HV call to add the pages into the io controller address space.
507  */
508 
509 static int dma_sb_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
510             unsigned long len, struct dma_chunk **c_out, u64 iopte_flag)
511 {
512         int result;
513         struct dma_chunk *c;
514 
515         c = kzalloc(sizeof(*c), GFP_ATOMIC);
516         if (!c) {
517                 result = -ENOMEM;
518                 goto fail_alloc;
519         }
520 
521         c->region = r;
522         c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
523         c->bus_addr = dma_sb_lpar_to_bus(r, c->lpar_addr);
524         c->len = len;
525 
526         BUG_ON(iopte_flag != 0xf800000000000000UL);
527         result = lv1_map_device_dma_region(c->region->dev->bus_id,
528                                            c->region->dev->dev_id, c->lpar_addr,
529                                            c->bus_addr, c->len, iopte_flag);
530         if (result) {
531                 DBG("%s:%d: lv1_map_device_dma_region failed: %s\n",
532                         __func__, __LINE__, ps3_result(result));
533                 goto fail_map;
534         }
535 
536         list_add(&c->link, &r->chunk_list.head);
537 
538         *c_out = c;
539         return 0;
540 
541 fail_map:
542         kfree(c);
543 fail_alloc:
544         *c_out = NULL;
545         DBG(" <- %s:%d\n", __func__, __LINE__);
546         return result;
547 }
548 
549 static int dma_ioc0_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
550                               unsigned long len, struct dma_chunk **c_out,
551                               u64 iopte_flag)
552 {
553         int result;
554         struct dma_chunk *c, *last;
555         int iopage, pages;
556         unsigned long offset;
557 
558         DBG(KERN_ERR "%s: phy=%#lx, lpar%#lx, len=%#lx\n", __func__,
559             phys_addr, ps3_mm_phys_to_lpar(phys_addr), len);
560         c = kzalloc(sizeof(*c), GFP_ATOMIC);
561         if (!c) {
562                 result = -ENOMEM;
563                 goto fail_alloc;
564         }
565 
566         c->region = r;
567         c->len = len;
568         c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
569         /* allocate IO address */
570         if (list_empty(&r->chunk_list.head)) {
571                 /* first one */
572                 c->bus_addr = r->bus_addr;
573         } else {
574                 /* derive from last bus addr*/
575                 last  = list_entry(r->chunk_list.head.next,
576                                    struct dma_chunk, link);
577                 c->bus_addr = last->bus_addr + last->len;
578                 DBG("%s: last bus=%#lx, len=%#lx\n", __func__,
579                     last->bus_addr, last->len);
580         }
581 
582         /* FIXME: check whether length exceeds region size */
583 
584         /* build ioptes for the area */
585         pages = len >> r->page_size;
586         DBG("%s: pgsize=%#x len=%#lx pages=%#x iopteflag=%#llx\n", __func__,
587             r->page_size, r->len, pages, iopte_flag);
588         for (iopage = 0; iopage < pages; iopage++) {
589                 offset = (1 << r->page_size) * iopage;
590                 result = lv1_put_iopte(0,
591                                        c->bus_addr + offset,
592                                        c->lpar_addr + offset,
593                                        r->ioid,
594                                        iopte_flag);
595                 if (result) {
596                         pr_warn("%s:%d: lv1_put_iopte failed: %s\n",
597                                 __func__, __LINE__, ps3_result(result));
598                         goto fail_map;
599                 }
600                 DBG("%s: pg=%d bus=%#lx, lpar=%#lx, ioid=%#x\n", __func__,
601                     iopage, c->bus_addr + offset, c->lpar_addr + offset,
602                     r->ioid);
603         }
604 
605         /* be sure that last allocated one is inserted at head */
606         list_add(&c->link, &r->chunk_list.head);
607 
608         *c_out = c;
609         DBG("%s: end\n", __func__);
610         return 0;
611 
612 fail_map:
613         for (iopage--; 0 <= iopage; iopage--) {
614                 lv1_put_iopte(0,
615                               c->bus_addr + offset,
616                               c->lpar_addr + offset,
617                               r->ioid,
618                               0);
619         }
620         kfree(c);
621 fail_alloc:
622         *c_out = NULL;
623         return result;
624 }
625 
626 /**
627  * dma_sb_region_create - Create a device dma region.
628  * @r: Pointer to a struct ps3_dma_region.
629  *
630  * This is the lowest level dma region create routine, and is the one that
631  * will make the HV call to create the region.
632  */
633 
634 static int dma_sb_region_create(struct ps3_dma_region *r)
635 {
636         int result;
637         u64 bus_addr;
638 
639         DBG(" -> %s:%d:\n", __func__, __LINE__);
640 
641         BUG_ON(!r);
642 
643         if (!r->dev->bus_id) {
644                 pr_info("%s:%d: %llu:%llu no dma\n", __func__, __LINE__,
645                         r->dev->bus_id, r->dev->dev_id);
646                 return 0;
647         }
648 
649         DBG("%s:%u: len = 0x%lx, page_size = %u, offset = 0x%lx\n", __func__,
650             __LINE__, r->len, r->page_size, r->offset);
651 
652         BUG_ON(!r->len);
653         BUG_ON(!r->page_size);
654         BUG_ON(!r->region_ops);
655 
656         INIT_LIST_HEAD(&r->chunk_list.head);
657         spin_lock_init(&r->chunk_list.lock);
658 
659         result = lv1_allocate_device_dma_region(r->dev->bus_id, r->dev->dev_id,
660                 roundup_pow_of_two(r->len), r->page_size, r->region_type,
661                 &bus_addr);
662         r->bus_addr = bus_addr;
663 
664         if (result) {
665                 DBG("%s:%d: lv1_allocate_device_dma_region failed: %s\n",
666                         __func__, __LINE__, ps3_result(result));
667                 r->len = r->bus_addr = 0;
668         }
669 
670         return result;
671 }
672 
673 static int dma_ioc0_region_create(struct ps3_dma_region *r)
674 {
675         int result;
676         u64 bus_addr;
677 
678         INIT_LIST_HEAD(&r->chunk_list.head);
679         spin_lock_init(&r->chunk_list.lock);
680 
681         result = lv1_allocate_io_segment(0,
682                                          r->len,
683                                          r->page_size,
684                                          &bus_addr);
685         r->bus_addr = bus_addr;
686         if (result) {
687                 DBG("%s:%d: lv1_allocate_io_segment failed: %s\n",
688                         __func__, __LINE__, ps3_result(result));
689                 r->len = r->bus_addr = 0;
690         }
691         DBG("%s: len=%#lx, pg=%d, bus=%#lx\n", __func__,
692             r->len, r->page_size, r->bus_addr);
693         return result;
694 }
695 
696 /**
697  * dma_region_free - Free a device dma region.
698  * @r: Pointer to a struct ps3_dma_region.
699  *
700  * This is the lowest level dma region free routine, and is the one that
701  * will make the HV call to free the region.
702  */
703 
704 static int dma_sb_region_free(struct ps3_dma_region *r)
705 {
706         int result;
707         struct dma_chunk *c;
708         struct dma_chunk *tmp;
709 
710         BUG_ON(!r);
711 
712         if (!r->dev->bus_id) {
713                 pr_info("%s:%d: %llu:%llu no dma\n", __func__, __LINE__,
714                         r->dev->bus_id, r->dev->dev_id);
715                 return 0;
716         }
717 
718         list_for_each_entry_safe(c, tmp, &r->chunk_list.head, link) {
719                 list_del(&c->link);
720                 dma_sb_free_chunk(c);
721         }
722 
723         result = lv1_free_device_dma_region(r->dev->bus_id, r->dev->dev_id,
724                 r->bus_addr);
725 
726         if (result)
727                 DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
728                         __func__, __LINE__, ps3_result(result));
729 
730         r->bus_addr = 0;
731 
732         return result;
733 }
734 
735 static int dma_ioc0_region_free(struct ps3_dma_region *r)
736 {
737         int result;
738         struct dma_chunk *c, *n;
739 
740         DBG("%s: start\n", __func__);
741         list_for_each_entry_safe(c, n, &r->chunk_list.head, link) {
742                 list_del(&c->link);
743                 dma_ioc0_free_chunk(c);
744         }
745 
746         result = lv1_release_io_segment(0, r->bus_addr);
747 
748         if (result)
749                 DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
750                         __func__, __LINE__, ps3_result(result));
751 
752         r->bus_addr = 0;
753         DBG("%s: end\n", __func__);
754 
755         return result;
756 }
757 
758 /**
759  * dma_sb_map_area - Map an area of memory into a device dma region.
760  * @r: Pointer to a struct ps3_dma_region.
761  * @virt_addr: Starting virtual address of the area to map.
762  * @len: Length in bytes of the area to map.
763  * @bus_addr: A pointer to return the starting ioc bus address of the area to
764  * map.
765  *
766  * This is the common dma mapping routine.
767  */
768 
769 static int dma_sb_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
770            unsigned long len, dma_addr_t *bus_addr,
771            u64 iopte_flag)
772 {
773         int result;
774         unsigned long flags;
775         struct dma_chunk *c;
776         unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
777                 : virt_addr;
778         unsigned long aligned_phys = _ALIGN_DOWN(phys_addr, 1 << r->page_size);
779         unsigned long aligned_len = _ALIGN_UP(len + phys_addr - aligned_phys,
780                                               1 << r->page_size);
781         *bus_addr = dma_sb_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
782 
783         if (!USE_DYNAMIC_DMA) {
784                 unsigned long lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
785                 DBG(" -> %s:%d\n", __func__, __LINE__);
786                 DBG("%s:%d virt_addr %lxh\n", __func__, __LINE__,
787                         virt_addr);
788                 DBG("%s:%d phys_addr %lxh\n", __func__, __LINE__,
789                         phys_addr);
790                 DBG("%s:%d lpar_addr %lxh\n", __func__, __LINE__,
791                         lpar_addr);
792                 DBG("%s:%d len       %lxh\n", __func__, __LINE__, len);
793                 DBG("%s:%d bus_addr  %llxh (%lxh)\n", __func__, __LINE__,
794                 *bus_addr, len);
795         }
796 
797         spin_lock_irqsave(&r->chunk_list.lock, flags);
798         c = dma_find_chunk(r, *bus_addr, len);
799 
800         if (c) {
801                 DBG("%s:%d: reusing mapped chunk", __func__, __LINE__);
802                 dma_dump_chunk(c);
803                 c->usage_count++;
804                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
805                 return 0;
806         }
807 
808         result = dma_sb_map_pages(r, aligned_phys, aligned_len, &c, iopte_flag);
809 
810         if (result) {
811                 *bus_addr = 0;
812                 DBG("%s:%d: dma_sb_map_pages failed (%d)\n",
813                         __func__, __LINE__, result);
814                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
815                 return result;
816         }
817 
818         c->usage_count = 1;
819 
820         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
821         return result;
822 }
823 
824 static int dma_ioc0_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
825              unsigned long len, dma_addr_t *bus_addr,
826              u64 iopte_flag)
827 {
828         int result;
829         unsigned long flags;
830         struct dma_chunk *c;
831         unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
832                 : virt_addr;
833         unsigned long aligned_phys = _ALIGN_DOWN(phys_addr, 1 << r->page_size);
834         unsigned long aligned_len = _ALIGN_UP(len + phys_addr - aligned_phys,
835                                               1 << r->page_size);
836 
837         DBG(KERN_ERR "%s: vaddr=%#lx, len=%#lx\n", __func__,
838             virt_addr, len);
839         DBG(KERN_ERR "%s: ph=%#lx a_ph=%#lx a_l=%#lx\n", __func__,
840             phys_addr, aligned_phys, aligned_len);
841 
842         spin_lock_irqsave(&r->chunk_list.lock, flags);
843         c = dma_find_chunk_lpar(r, ps3_mm_phys_to_lpar(phys_addr), len);
844 
845         if (c) {
846                 /* FIXME */
847                 BUG();
848                 *bus_addr = c->bus_addr + phys_addr - aligned_phys;
849                 c->usage_count++;
850                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
851                 return 0;
852         }
853 
854         result = dma_ioc0_map_pages(r, aligned_phys, aligned_len, &c,
855                                     iopte_flag);
856 
857         if (result) {
858                 *bus_addr = 0;
859                 DBG("%s:%d: dma_ioc0_map_pages failed (%d)\n",
860                         __func__, __LINE__, result);
861                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
862                 return result;
863         }
864         *bus_addr = c->bus_addr + phys_addr - aligned_phys;
865         DBG("%s: va=%#lx pa=%#lx a_pa=%#lx bus=%#llx\n", __func__,
866             virt_addr, phys_addr, aligned_phys, *bus_addr);
867         c->usage_count = 1;
868 
869         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
870         return result;
871 }
872 
873 /**
874  * dma_sb_unmap_area - Unmap an area of memory from a device dma region.
875  * @r: Pointer to a struct ps3_dma_region.
876  * @bus_addr: The starting ioc bus address of the area to unmap.
877  * @len: Length in bytes of the area to unmap.
878  *
879  * This is the common dma unmap routine.
880  */
881 
882 static int dma_sb_unmap_area(struct ps3_dma_region *r, dma_addr_t bus_addr,
883         unsigned long len)
884 {
885         unsigned long flags;
886         struct dma_chunk *c;
887 
888         spin_lock_irqsave(&r->chunk_list.lock, flags);
889         c = dma_find_chunk(r, bus_addr, len);
890 
891         if (!c) {
892                 unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
893                         1 << r->page_size);
894                 unsigned long aligned_len = _ALIGN_UP(len + bus_addr
895                         - aligned_bus, 1 << r->page_size);
896                 DBG("%s:%d: not found: bus_addr %llxh\n",
897                         __func__, __LINE__, bus_addr);
898                 DBG("%s:%d: not found: len %lxh\n",
899                         __func__, __LINE__, len);
900                 DBG("%s:%d: not found: aligned_bus %lxh\n",
901                         __func__, __LINE__, aligned_bus);
902                 DBG("%s:%d: not found: aligned_len %lxh\n",
903                         __func__, __LINE__, aligned_len);
904                 BUG();
905         }
906 
907         c->usage_count--;
908 
909         if (!c->usage_count) {
910                 list_del(&c->link);
911                 dma_sb_free_chunk(c);
912         }
913 
914         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
915         return 0;
916 }
917 
918 static int dma_ioc0_unmap_area(struct ps3_dma_region *r,
919                         dma_addr_t bus_addr, unsigned long len)
920 {
921         unsigned long flags;
922         struct dma_chunk *c;
923 
924         DBG("%s: start a=%#llx l=%#lx\n", __func__, bus_addr, len);
925         spin_lock_irqsave(&r->chunk_list.lock, flags);
926         c = dma_find_chunk(r, bus_addr, len);
927 
928         if (!c) {
929                 unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
930                                                         1 << r->page_size);
931                 unsigned long aligned_len = _ALIGN_UP(len + bus_addr
932                                                       - aligned_bus,
933                                                       1 << r->page_size);
934                 DBG("%s:%d: not found: bus_addr %llxh\n",
935                     __func__, __LINE__, bus_addr);
936                 DBG("%s:%d: not found: len %lxh\n",
937                     __func__, __LINE__, len);
938                 DBG("%s:%d: not found: aligned_bus %lxh\n",
939                     __func__, __LINE__, aligned_bus);
940                 DBG("%s:%d: not found: aligned_len %lxh\n",
941                     __func__, __LINE__, aligned_len);
942                 BUG();
943         }
944 
945         c->usage_count--;
946 
947         if (!c->usage_count) {
948                 list_del(&c->link);
949                 dma_ioc0_free_chunk(c);
950         }
951 
952         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
953         DBG("%s: end\n", __func__);
954         return 0;
955 }
956 
957 /**
958  * dma_sb_region_create_linear - Setup a linear dma mapping for a device.
959  * @r: Pointer to a struct ps3_dma_region.
960  *
961  * This routine creates an HV dma region for the device and maps all available
962  * ram into the io controller bus address space.
963  */
964 
965 static int dma_sb_region_create_linear(struct ps3_dma_region *r)
966 {
967         int result;
968         unsigned long virt_addr, len;
969         dma_addr_t tmp;
970 
971         if (r->len > 16*1024*1024) {    /* FIXME: need proper fix */
972                 /* force 16M dma pages for linear mapping */
973                 if (r->page_size != PS3_DMA_16M) {
974                         pr_info("%s:%d: forcing 16M pages for linear map\n",
975                                 __func__, __LINE__);
976                         r->page_size = PS3_DMA_16M;
977                         r->len = _ALIGN_UP(r->len, 1 << r->page_size);
978                 }
979         }
980 
981         result = dma_sb_region_create(r);
982         BUG_ON(result);
983 
984         if (r->offset < map.rm.size) {
985                 /* Map (part of) 1st RAM chunk */
986                 virt_addr = map.rm.base + r->offset;
987                 len = map.rm.size - r->offset;
988                 if (len > r->len)
989                         len = r->len;
990                 result = dma_sb_map_area(r, virt_addr, len, &tmp,
991                         CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_SO_RW |
992                         CBE_IOPTE_M);
993                 BUG_ON(result);
994         }
995 
996         if (r->offset + r->len > map.rm.size) {
997                 /* Map (part of) 2nd RAM chunk */
998                 virt_addr = map.rm.size;
999                 len = r->len;
1000                 if (r->offset >= map.rm.size)
1001                         virt_addr += r->offset - map.rm.size;
1002                 else
1003                         len -= map.rm.size - r->offset;
1004                 result = dma_sb_map_area(r, virt_addr, len, &tmp,
1005                         CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_SO_RW |
1006                         CBE_IOPTE_M);
1007                 BUG_ON(result);
1008         }
1009 
1010         return result;
1011 }
1012 
1013 /**
1014  * dma_sb_region_free_linear - Free a linear dma mapping for a device.
1015  * @r: Pointer to a struct ps3_dma_region.
1016  *
1017  * This routine will unmap all mapped areas and free the HV dma region.
1018  */
1019 
1020 static int dma_sb_region_free_linear(struct ps3_dma_region *r)
1021 {
1022         int result;
1023         dma_addr_t bus_addr;
1024         unsigned long len, lpar_addr;
1025 
1026         if (r->offset < map.rm.size) {
1027                 /* Unmap (part of) 1st RAM chunk */
1028                 lpar_addr = map.rm.base + r->offset;
1029                 len = map.rm.size - r->offset;
1030                 if (len > r->len)
1031                         len = r->len;
1032                 bus_addr = dma_sb_lpar_to_bus(r, lpar_addr);
1033                 result = dma_sb_unmap_area(r, bus_addr, len);
1034                 BUG_ON(result);
1035         }
1036 
1037         if (r->offset + r->len > map.rm.size) {
1038                 /* Unmap (part of) 2nd RAM chunk */
1039                 lpar_addr = map.r1.base;
1040                 len = r->len;
1041                 if (r->offset >= map.rm.size)
1042                         lpar_addr += r->offset - map.rm.size;
1043                 else
1044                         len -= map.rm.size - r->offset;
1045                 bus_addr = dma_sb_lpar_to_bus(r, lpar_addr);
1046                 result = dma_sb_unmap_area(r, bus_addr, len);
1047                 BUG_ON(result);
1048         }
1049 
1050         result = dma_sb_region_free(r);
1051         BUG_ON(result);
1052 
1053         return result;
1054 }
1055 
1056 /**
1057  * dma_sb_map_area_linear - Map an area of memory into a device dma region.
1058  * @r: Pointer to a struct ps3_dma_region.
1059  * @virt_addr: Starting virtual address of the area to map.
1060  * @len: Length in bytes of the area to map.
1061  * @bus_addr: A pointer to return the starting ioc bus address of the area to
1062  * map.
1063  *
1064  * This routine just returns the corresponding bus address.  Actual mapping
1065  * occurs in dma_region_create_linear().
1066  */
1067 
1068 static int dma_sb_map_area_linear(struct ps3_dma_region *r,
1069         unsigned long virt_addr, unsigned long len, dma_addr_t *bus_addr,
1070         u64 iopte_flag)
1071 {
1072         unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
1073                 : virt_addr;
1074         *bus_addr = dma_sb_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
1075         return 0;
1076 }
1077 
1078 /**
1079  * dma_unmap_area_linear - Unmap an area of memory from a device dma region.
1080  * @r: Pointer to a struct ps3_dma_region.
1081  * @bus_addr: The starting ioc bus address of the area to unmap.
1082  * @len: Length in bytes of the area to unmap.
1083  *
1084  * This routine does nothing.  Unmapping occurs in dma_sb_region_free_linear().
1085  */
1086 
1087 static int dma_sb_unmap_area_linear(struct ps3_dma_region *r,
1088         dma_addr_t bus_addr, unsigned long len)
1089 {
1090         return 0;
1091 };
1092 
1093 static const struct ps3_dma_region_ops ps3_dma_sb_region_ops =  {
1094         .create = dma_sb_region_create,
1095         .free = dma_sb_region_free,
1096         .map = dma_sb_map_area,
1097         .unmap = dma_sb_unmap_area
1098 };
1099 
1100 static const struct ps3_dma_region_ops ps3_dma_sb_region_linear_ops = {
1101         .create = dma_sb_region_create_linear,
1102         .free = dma_sb_region_free_linear,
1103         .map = dma_sb_map_area_linear,
1104         .unmap = dma_sb_unmap_area_linear
1105 };
1106 
1107 static const struct ps3_dma_region_ops ps3_dma_ioc0_region_ops = {
1108         .create = dma_ioc0_region_create,
1109         .free = dma_ioc0_region_free,
1110         .map = dma_ioc0_map_area,
1111         .unmap = dma_ioc0_unmap_area
1112 };
1113 
1114 int ps3_dma_region_init(struct ps3_system_bus_device *dev,
1115         struct ps3_dma_region *r, enum ps3_dma_page_size page_size,
1116         enum ps3_dma_region_type region_type, void *addr, unsigned long len)
1117 {
1118         unsigned long lpar_addr;
1119 
1120         lpar_addr = addr ? ps3_mm_phys_to_lpar(__pa(addr)) : 0;
1121 
1122         r->dev = dev;
1123         r->page_size = page_size;
1124         r->region_type = region_type;
1125         r->offset = lpar_addr;
1126         if (r->offset >= map.rm.size)
1127                 r->offset -= map.r1.offset;
1128         r->len = len ? len : _ALIGN_UP(map.total, 1 << r->page_size);
1129 
1130         switch (dev->dev_type) {
1131         case PS3_DEVICE_TYPE_SB:
1132                 r->region_ops =  (USE_DYNAMIC_DMA)
1133                         ? &ps3_dma_sb_region_ops
1134                         : &ps3_dma_sb_region_linear_ops;
1135                 break;
1136         case PS3_DEVICE_TYPE_IOC0:
1137                 r->region_ops = &ps3_dma_ioc0_region_ops;
1138                 break;
1139         default:
1140                 BUG();
1141                 return -EINVAL;
1142         }
1143         return 0;
1144 }
1145 EXPORT_SYMBOL(ps3_dma_region_init);
1146 
1147 int ps3_dma_region_create(struct ps3_dma_region *r)
1148 {
1149         BUG_ON(!r);
1150         BUG_ON(!r->region_ops);
1151         BUG_ON(!r->region_ops->create);
1152         return r->region_ops->create(r);
1153 }
1154 EXPORT_SYMBOL(ps3_dma_region_create);
1155 
1156 int ps3_dma_region_free(struct ps3_dma_region *r)
1157 {
1158         BUG_ON(!r);
1159         BUG_ON(!r->region_ops);
1160         BUG_ON(!r->region_ops->free);
1161         return r->region_ops->free(r);
1162 }
1163 EXPORT_SYMBOL(ps3_dma_region_free);
1164 
1165 int ps3_dma_map(struct ps3_dma_region *r, unsigned long virt_addr,
1166         unsigned long len, dma_addr_t *bus_addr,
1167         u64 iopte_flag)
1168 {
1169         return r->region_ops->map(r, virt_addr, len, bus_addr, iopte_flag);
1170 }
1171 
1172 int ps3_dma_unmap(struct ps3_dma_region *r, dma_addr_t bus_addr,
1173         unsigned long len)
1174 {
1175         return r->region_ops->unmap(r, bus_addr, len);
1176 }
1177 
1178 /*============================================================================*/
1179 /* system startup routines                                                    */
1180 /*============================================================================*/
1181 
1182 /**
1183  * ps3_mm_init - initialize the address space state variables
1184  */
1185 
1186 void __init ps3_mm_init(void)
1187 {
1188         int result;
1189 
1190         DBG(" -> %s:%d\n", __func__, __LINE__);
1191 
1192         result = ps3_repository_read_mm_info(&map.rm.base, &map.rm.size,
1193                 &map.total);
1194 
1195         if (result)
1196                 panic("ps3_repository_read_mm_info() failed");
1197 
1198         map.rm.offset = map.rm.base;
1199         map.vas_id = map.htab_size = 0;
1200 
1201         /* this implementation assumes map.rm.base is zero */
1202 
1203         BUG_ON(map.rm.base);
1204         BUG_ON(!map.rm.size);
1205 
1206         /* Check if we got the highmem region from an earlier boot step */
1207 
1208         if (ps3_mm_get_repository_highmem(&map.r1)) {
1209                 result = ps3_mm_region_create(&map.r1, map.total - map.rm.size);
1210 
1211                 if (!result)
1212                         ps3_mm_set_repository_highmem(&map.r1);
1213         }
1214 
1215         /* correct map.total for the real total amount of memory we use */
1216         map.total = map.rm.size + map.r1.size;
1217 
1218         if (!map.r1.size) {
1219                 DBG("%s:%d: No highmem region found\n", __func__, __LINE__);
1220         } else {
1221                 DBG("%s:%d: Adding highmem region: %llxh %llxh\n",
1222                         __func__, __LINE__, map.rm.size,
1223                         map.total - map.rm.size);
1224                 memblock_add(map.rm.size, map.total - map.rm.size);
1225         }
1226 
1227         DBG(" <- %s:%d\n", __func__, __LINE__);
1228 }
1229 
1230 /**
1231  * ps3_mm_shutdown - final cleanup of address space
1232  */
1233 
1234 void ps3_mm_shutdown(void)
1235 {
1236         ps3_mm_region_destroy(&map.r1);
1237 }
1238 

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