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

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/export.h>
 23 #include <linux/memblock.h>
 24 #include <linux/slab.h>
 25 
 26 #include <asm/cell-regs.h>
 27 #include <asm/firmware.h>
 28 #include <asm/prom.h>
 29 #include <asm/udbg.h>
 30 #include <asm/lv1call.h>
 31 #include <asm/setup.h>
 32 
 33 #include "platform.h"
 34 
 35 #if defined(DEBUG)
 36 #define DBG udbg_printf
 37 #else
 38 #define DBG pr_devel
 39 #endif
 40 
 41 enum {
 42 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 43         USE_DYNAMIC_DMA = 1,
 44 #else
 45         USE_DYNAMIC_DMA = 0,
 46 #endif
 47 };
 48 
 49 enum {
 50         PAGE_SHIFT_4K = 12U,
 51         PAGE_SHIFT_64K = 16U,
 52         PAGE_SHIFT_16M = 24U,
 53 };
 54 
 55 static unsigned long make_page_sizes(unsigned long a, unsigned long b)
 56 {
 57         return (a << 56) | (b << 48);
 58 }
 59 
 60 enum {
 61         ALLOCATE_MEMORY_TRY_ALT_UNIT = 0X04,
 62         ALLOCATE_MEMORY_ADDR_ZERO = 0X08,
 63 };
 64 
 65 /* valid htab sizes are {18,19,20} = 256K, 512K, 1M */
 66 
 67 enum {
 68         HTAB_SIZE_MAX = 20U, /* HV limit of 1MB */
 69         HTAB_SIZE_MIN = 18U, /* CPU limit of 256KB */
 70 };
 71 
 72 /*============================================================================*/
 73 /* virtual address space routines                                             */
 74 /*============================================================================*/
 75 
 76 /**
 77  * struct mem_region - memory region structure
 78  * @base: base address
 79  * @size: size in bytes
 80  * @offset: difference between base and rm.size
 81  * @destroy: flag if region should be destroyed upon shutdown
 82  */
 83 
 84 struct mem_region {
 85         u64 base;
 86         u64 size;
 87         unsigned long offset;
 88         int destroy;
 89 };
 90 
 91 /**
 92  * struct map - address space state variables holder
 93  * @total: total memory available as reported by HV
 94  * @vas_id - HV virtual address space id
 95  * @htab_size: htab size in bytes
 96  *
 97  * The HV virtual address space (vas) allows for hotplug memory regions.
 98  * Memory regions can be created and destroyed in the vas at runtime.
 99  * @rm: real mode (bootmem) region
100  * @r1: highmem region(s)
101  *
102  * ps3 addresses
103  * virt_addr: a cpu 'translated' effective address
104  * phys_addr: an address in what Linux thinks is the physical address space
105  * lpar_addr: an address in the HV virtual address space
106  * bus_addr: an io controller 'translated' address on a device bus
107  */
108 
109 struct map {
110         u64 total;
111         u64 vas_id;
112         u64 htab_size;
113         struct mem_region rm;
114         struct mem_region r1;
115 };
116 
117 #define debug_dump_map(x) _debug_dump_map(x, __func__, __LINE__)
118 static void __maybe_unused _debug_dump_map(const struct map *m,
119         const char *func, int line)
120 {
121         DBG("%s:%d: map.total     = %llxh\n", func, line, m->total);
122         DBG("%s:%d: map.rm.size   = %llxh\n", func, line, m->rm.size);
123         DBG("%s:%d: map.vas_id    = %llu\n", func, line, m->vas_id);
124         DBG("%s:%d: map.htab_size = %llxh\n", func, line, m->htab_size);
125         DBG("%s:%d: map.r1.base   = %llxh\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   = %llxh\n", func, line, m->r1.size);
128 }
129 
130 static 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 
137 unsigned long ps3_mm_phys_to_lpar(unsigned long phys_addr)
138 {
139         BUG_ON(is_kernel_addr(phys_addr));
140         return (phys_addr < map.rm.size || phys_addr >= map.total)
141                 ? phys_addr : phys_addr + map.r1.offset;
142 }
143 
144 EXPORT_SYMBOL(ps3_mm_phys_to_lpar);
145 
146 /**
147  * ps3_mm_vas_create - create the virtual address space
148  */
149 
150 void __init ps3_mm_vas_create(unsigned long* htab_size)
151 {
152         int result;
153         u64 start_address;
154         u64 size;
155         u64 access_right;
156         u64 max_page_size;
157         u64 flags;
158 
159         result = lv1_query_logical_partition_address_region_info(0,
160                 &start_address, &size, &access_right, &max_page_size,
161                 &flags);
162 
163         if (result) {
164                 DBG("%s:%d: lv1_query_logical_partition_address_region_info "
165                         "failed: %s\n", __func__, __LINE__,
166                         ps3_result(result));
167                 goto fail;
168         }
169 
170         if (max_page_size < PAGE_SHIFT_16M) {
171                 DBG("%s:%d: bad max_page_size %llxh\n", __func__, __LINE__,
172                         max_page_size);
173                 goto fail;
174         }
175 
176         BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE > HTAB_SIZE_MAX);
177         BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE < HTAB_SIZE_MIN);
178 
179         result = lv1_construct_virtual_address_space(CONFIG_PS3_HTAB_SIZE,
180                         2, make_page_sizes(PAGE_SHIFT_16M, PAGE_SHIFT_64K),
181                         &map.vas_id, &map.htab_size);
182 
183         if (result) {
184                 DBG("%s:%d: lv1_construct_virtual_address_space failed: %s\n",
185                         __func__, __LINE__, ps3_result(result));
186                 goto fail;
187         }
188 
189         result = lv1_select_virtual_address_space(map.vas_id);
190 
191         if (result) {
192                 DBG("%s:%d: lv1_select_virtual_address_space failed: %s\n",
193                         __func__, __LINE__, ps3_result(result));
194                 goto fail;
195         }
196 
197         *htab_size = map.htab_size;
198 
199         debug_dump_map(&map);
200 
201         return;
202 
203 fail:
204         panic("ps3_mm_vas_create failed");
205 }
206 
207 /**
208  * ps3_mm_vas_destroy -
209  */
210 
211 void ps3_mm_vas_destroy(void)
212 {
213         int result;
214 
215         DBG("%s:%d: map.vas_id    = %llu\n", __func__, __LINE__, map.vas_id);
216 
217         if (map.vas_id) {
218                 result = lv1_select_virtual_address_space(0);
219                 BUG_ON(result);
220                 result = lv1_destruct_virtual_address_space(map.vas_id);
221                 BUG_ON(result);
222                 map.vas_id = 0;
223         }
224 }
225 
226 static int ps3_mm_get_repository_highmem(struct mem_region *r)
227 {
228         int result;
229 
230         /* Assume a single highmem region. */
231 
232         result = ps3_repository_read_highmem_info(0, &r->base, &r->size);
233 
234         if (result)
235                 goto zero_region;
236 
237         if (!r->base || !r->size) {
238                 result = -1;
239                 goto zero_region;
240         }
241 
242         r->offset = r->base - map.rm.size;
243 
244         DBG("%s:%d: Found high region in repository: %llxh %llxh\n",
245             __func__, __LINE__, r->base, r->size);
246 
247         return 0;
248 
249 zero_region:
250         DBG("%s:%d: No high region in repository.\n", __func__, __LINE__);
251 
252         r->size = r->base = r->offset = 0;
253         return result;
254 }
255 
256 static int ps3_mm_set_repository_highmem(const struct mem_region *r)
257 {
258         /* Assume a single highmem region. */
259 
260         return r ? ps3_repository_write_highmem_info(0, r->base, r->size) :
261                 ps3_repository_write_highmem_info(0, 0, 0);
262 }
263 
264 /**
265  * ps3_mm_region_create - create a memory region in the vas
266  * @r: pointer to a struct mem_region to accept initialized values
267  * @size: requested region size
268  *
269  * This implementation creates the region with the vas large page size.
270  * @size is rounded down to a multiple of the vas large page size.
271  */
272 
273 static int ps3_mm_region_create(struct mem_region *r, unsigned long size)
274 {
275         int result;
276         u64 muid;
277 
278         r->size = _ALIGN_DOWN(size, 1 << PAGE_SHIFT_16M);
279 
280         DBG("%s:%d requested  %lxh\n", __func__, __LINE__, size);
281         DBG("%s:%d actual     %llxh\n", __func__, __LINE__, r->size);
282         DBG("%s:%d difference %llxh (%lluMB)\n", __func__, __LINE__,
283                 size - r->size, (size - r->size) / 1024 / 1024);
284 
285         if (r->size == 0) {
286                 DBG("%s:%d: size == 0\n", __func__, __LINE__);
287                 result = -1;
288                 goto zero_region;
289         }
290 
291         result = lv1_allocate_memory(r->size, PAGE_SHIFT_16M, 0,
292                 ALLOCATE_MEMORY_TRY_ALT_UNIT, &r->base, &muid);
293 
294         if (result || r->base < map.rm.size) {
295                 DBG("%s:%d: lv1_allocate_memory failed: %s\n",
296                         __func__, __LINE__, ps3_result(result));
297                 goto zero_region;
298         }
299 
300         r->destroy = 1;
301         r->offset = r->base - map.rm.size;
302         return result;
303 
304 zero_region:
305         r->size = r->base = r->offset = 0;
306         return result;
307 }
308 
309 /**
310  * ps3_mm_region_destroy - destroy a memory region
311  * @r: pointer to struct mem_region
312  */
313 
314 static void ps3_mm_region_destroy(struct mem_region *r)
315 {
316         int result;
317 
318         if (!r->destroy) {
319                 pr_info("%s:%d: Not destroying high region: %llxh %llxh\n",
320                         __func__, __LINE__, r->base, r->size);
321                 return;
322         }
323 
324         DBG("%s:%d: r->base = %llxh\n", __func__, __LINE__, r->base);
325 
326         if (r->base) {
327                 result = lv1_release_memory(r->base);
328                 BUG_ON(result);
329                 r->size = r->base = r->offset = 0;
330                 map.total = map.rm.size;
331         }
332         ps3_mm_set_repository_highmem(NULL);
333 }
334 
335 /*============================================================================*/
336 /* dma routines                                                               */
337 /*============================================================================*/
338 
339 /**
340  * dma_sb_lpar_to_bus - Translate an lpar address to ioc mapped bus address.
341  * @r: pointer to dma region structure
342  * @lpar_addr: HV lpar address
343  */
344 
345 static unsigned long dma_sb_lpar_to_bus(struct ps3_dma_region *r,
346         unsigned long lpar_addr)
347 {
348         if (lpar_addr >= map.rm.size)
349                 lpar_addr -= map.r1.offset;
350         BUG_ON(lpar_addr < r->offset);
351         BUG_ON(lpar_addr >= r->offset + r->len);
352         return r->bus_addr + lpar_addr - r->offset;
353 }
354 
355 #define dma_dump_region(_a) _dma_dump_region(_a, __func__, __LINE__)
356 static void  __maybe_unused _dma_dump_region(const struct ps3_dma_region *r,
357         const char *func, int line)
358 {
359         DBG("%s:%d: dev        %llu:%llu\n", func, line, r->dev->bus_id,
360                 r->dev->dev_id);
361         DBG("%s:%d: page_size  %u\n", func, line, r->page_size);
362         DBG("%s:%d: bus_addr   %lxh\n", func, line, r->bus_addr);
363         DBG("%s:%d: len        %lxh\n", func, line, r->len);
364         DBG("%s:%d: offset     %lxh\n", func, line, r->offset);
365 }
366 
367   /**
368  * dma_chunk - A chunk of dma pages mapped by the io controller.
369  * @region - The dma region that owns this chunk.
370  * @lpar_addr: Starting lpar address of the area to map.
371  * @bus_addr: Starting ioc bus address of the area to map.
372  * @len: Length in bytes of the area to map.
373  * @link: A struct list_head used with struct ps3_dma_region.chunk_list, the
374  * list of all chuncks owned by the region.
375  *
376  * This implementation uses a very simple dma page manager
377  * based on the dma_chunk structure.  This scheme assumes
378  * that all drivers use very well behaved dma ops.
379  */
380 
381 struct dma_chunk {
382         struct ps3_dma_region *region;
383         unsigned long lpar_addr;
384         unsigned long bus_addr;
385         unsigned long len;
386         struct list_head link;
387         unsigned int usage_count;
388 };
389 
390 #define dma_dump_chunk(_a) _dma_dump_chunk(_a, __func__, __LINE__)
391 static void _dma_dump_chunk (const struct dma_chunk* c, const char* func,
392         int line)
393 {
394         DBG("%s:%d: r.dev        %llu:%llu\n", func, line,
395                 c->region->dev->bus_id, c->region->dev->dev_id);
396         DBG("%s:%d: r.bus_addr   %lxh\n", func, line, c->region->bus_addr);
397         DBG("%s:%d: r.page_size  %u\n", func, line, c->region->page_size);
398         DBG("%s:%d: r.len        %lxh\n", func, line, c->region->len);
399         DBG("%s:%d: r.offset     %lxh\n", func, line, c->region->offset);
400         DBG("%s:%d: c.lpar_addr  %lxh\n", func, line, c->lpar_addr);
401         DBG("%s:%d: c.bus_addr   %lxh\n", func, line, c->bus_addr);
402         DBG("%s:%d: c.len        %lxh\n", func, line, c->len);
403 }
404 
405 static struct dma_chunk * dma_find_chunk(struct ps3_dma_region *r,
406         unsigned long bus_addr, unsigned long len)
407 {
408         struct dma_chunk *c;
409         unsigned long aligned_bus = _ALIGN_DOWN(bus_addr, 1 << r->page_size);
410         unsigned long aligned_len = _ALIGN_UP(len+bus_addr-aligned_bus,
411                                               1 << r->page_size);
412 
413         list_for_each_entry(c, &r->chunk_list.head, link) {
414                 /* intersection */
415                 if (aligned_bus >= c->bus_addr &&
416                     aligned_bus + aligned_len <= c->bus_addr + c->len)
417                         return c;
418 
419                 /* below */
420                 if (aligned_bus + aligned_len <= c->bus_addr)
421                         continue;
422 
423                 /* above */
424                 if (aligned_bus >= c->bus_addr + c->len)
425                         continue;
426 
427                 /* we don't handle the multi-chunk case for now */
428                 dma_dump_chunk(c);
429                 BUG();
430         }
431         return NULL;
432 }
433 
434 static struct dma_chunk *dma_find_chunk_lpar(struct ps3_dma_region *r,
435         unsigned long lpar_addr, unsigned long len)
436 {
437         struct dma_chunk *c;
438         unsigned long aligned_lpar = _ALIGN_DOWN(lpar_addr, 1 << r->page_size);
439         unsigned long aligned_len = _ALIGN_UP(len + lpar_addr - aligned_lpar,
440                                               1 << r->page_size);
441 
442         list_for_each_entry(c, &r->chunk_list.head, link) {
443                 /* intersection */
444                 if (c->lpar_addr <= aligned_lpar &&
445                     aligned_lpar < c->lpar_addr + c->len) {
446                         if (aligned_lpar + aligned_len <= c->lpar_addr + c->len)
447                                 return c;
448                         else {
449                                 dma_dump_chunk(c);
450                                 BUG();
451                         }
452                 }
453                 /* below */
454                 if (aligned_lpar + aligned_len <= c->lpar_addr) {
455                         continue;
456                 }
457                 /* above */
458                 if (c->lpar_addr + c->len <= aligned_lpar) {
459                         continue;
460                 }
461         }
462         return NULL;
463 }
464 
465 static int dma_sb_free_chunk(struct dma_chunk *c)
466 {
467         int result = 0;
468 
469         if (c->bus_addr) {
470                 result = lv1_unmap_device_dma_region(c->region->dev->bus_id,
471                         c->region->dev->dev_id, c->bus_addr, c->len);
472                 BUG_ON(result);
473         }
474 
475         kfree(c);
476         return result;
477 }
478 
479 static int dma_ioc0_free_chunk(struct dma_chunk *c)
480 {
481         int result = 0;
482         int iopage;
483         unsigned long offset;
484         struct ps3_dma_region *r = c->region;
485 
486         DBG("%s:start\n", __func__);
487         for (iopage = 0; iopage < (c->len >> r->page_size); iopage++) {
488                 offset = (1 << r->page_size) * iopage;
489                 /* put INVALID entry */
490                 result = lv1_put_iopte(0,
491                                        c->bus_addr + offset,
492                                        c->lpar_addr + offset,
493                                        r->ioid,
494                                        0);
495                 DBG("%s: bus=%#lx, lpar=%#lx, ioid=%d\n", __func__,
496                     c->bus_addr + offset,
497                     c->lpar_addr + offset,
498                     r->ioid);
499 
500                 if (result) {
501                         DBG("%s:%d: lv1_put_iopte failed: %s\n", __func__,
502                             __LINE__, ps3_result(result));
503                 }
504         }
505         kfree(c);
506         DBG("%s:end\n", __func__);
507         return result;
508 }
509 
510 /**
511  * dma_sb_map_pages - Maps dma pages into the io controller bus address space.
512  * @r: Pointer to a struct ps3_dma_region.
513  * @phys_addr: Starting physical address of the area to map.
514  * @len: Length in bytes of the area to map.
515  * c_out: A pointer to receive an allocated struct dma_chunk for this area.
516  *
517  * This is the lowest level dma mapping routine, and is the one that will
518  * make the HV call to add the pages into the io controller address space.
519  */
520 
521 static int dma_sb_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
522             unsigned long len, struct dma_chunk **c_out, u64 iopte_flag)
523 {
524         int result;
525         struct dma_chunk *c;
526 
527         c = kzalloc(sizeof(*c), GFP_ATOMIC);
528         if (!c) {
529                 result = -ENOMEM;
530                 goto fail_alloc;
531         }
532 
533         c->region = r;
534         c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
535         c->bus_addr = dma_sb_lpar_to_bus(r, c->lpar_addr);
536         c->len = len;
537 
538         BUG_ON(iopte_flag != 0xf800000000000000UL);
539         result = lv1_map_device_dma_region(c->region->dev->bus_id,
540                                            c->region->dev->dev_id, c->lpar_addr,
541                                            c->bus_addr, c->len, iopte_flag);
542         if (result) {
543                 DBG("%s:%d: lv1_map_device_dma_region failed: %s\n",
544                         __func__, __LINE__, ps3_result(result));
545                 goto fail_map;
546         }
547 
548         list_add(&c->link, &r->chunk_list.head);
549 
550         *c_out = c;
551         return 0;
552 
553 fail_map:
554         kfree(c);
555 fail_alloc:
556         *c_out = NULL;
557         DBG(" <- %s:%d\n", __func__, __LINE__);
558         return result;
559 }
560 
561 static int dma_ioc0_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
562                               unsigned long len, struct dma_chunk **c_out,
563                               u64 iopte_flag)
564 {
565         int result;
566         struct dma_chunk *c, *last;
567         int iopage, pages;
568         unsigned long offset;
569 
570         DBG(KERN_ERR "%s: phy=%#lx, lpar%#lx, len=%#lx\n", __func__,
571             phys_addr, ps3_mm_phys_to_lpar(phys_addr), len);
572         c = kzalloc(sizeof(*c), GFP_ATOMIC);
573         if (!c) {
574                 result = -ENOMEM;
575                 goto fail_alloc;
576         }
577 
578         c->region = r;
579         c->len = len;
580         c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
581         /* allocate IO address */
582         if (list_empty(&r->chunk_list.head)) {
583                 /* first one */
584                 c->bus_addr = r->bus_addr;
585         } else {
586                 /* derive from last bus addr*/
587                 last  = list_entry(r->chunk_list.head.next,
588                                    struct dma_chunk, link);
589                 c->bus_addr = last->bus_addr + last->len;
590                 DBG("%s: last bus=%#lx, len=%#lx\n", __func__,
591                     last->bus_addr, last->len);
592         }
593 
594         /* FIXME: check whether length exceeds region size */
595 
596         /* build ioptes for the area */
597         pages = len >> r->page_size;
598         DBG("%s: pgsize=%#x len=%#lx pages=%#x iopteflag=%#llx\n", __func__,
599             r->page_size, r->len, pages, iopte_flag);
600         for (iopage = 0; iopage < pages; iopage++) {
601                 offset = (1 << r->page_size) * iopage;
602                 result = lv1_put_iopte(0,
603                                        c->bus_addr + offset,
604                                        c->lpar_addr + offset,
605                                        r->ioid,
606                                        iopte_flag);
607                 if (result) {
608                         pr_warn("%s:%d: lv1_put_iopte failed: %s\n",
609                                 __func__, __LINE__, ps3_result(result));
610                         goto fail_map;
611                 }
612                 DBG("%s: pg=%d bus=%#lx, lpar=%#lx, ioid=%#x\n", __func__,
613                     iopage, c->bus_addr + offset, c->lpar_addr + offset,
614                     r->ioid);
615         }
616 
617         /* be sure that last allocated one is inserted at head */
618         list_add(&c->link, &r->chunk_list.head);
619 
620         *c_out = c;
621         DBG("%s: end\n", __func__);
622         return 0;
623 
624 fail_map:
625         for (iopage--; 0 <= iopage; iopage--) {
626                 lv1_put_iopte(0,
627                               c->bus_addr + offset,
628                               c->lpar_addr + offset,
629                               r->ioid,
630                               0);
631         }
632         kfree(c);
633 fail_alloc:
634         *c_out = NULL;
635         return result;
636 }
637 
638 /**
639  * dma_sb_region_create - Create a device dma region.
640  * @r: Pointer to a struct ps3_dma_region.
641  *
642  * This is the lowest level dma region create routine, and is the one that
643  * will make the HV call to create the region.
644  */
645 
646 static int dma_sb_region_create(struct ps3_dma_region *r)
647 {
648         int result;
649         u64 bus_addr;
650 
651         DBG(" -> %s:%d:\n", __func__, __LINE__);
652 
653         BUG_ON(!r);
654 
655         if (!r->dev->bus_id) {
656                 pr_info("%s:%d: %llu:%llu no dma\n", __func__, __LINE__,
657                         r->dev->bus_id, r->dev->dev_id);
658                 return 0;
659         }
660 
661         DBG("%s:%u: len = 0x%lx, page_size = %u, offset = 0x%lx\n", __func__,
662             __LINE__, r->len, r->page_size, r->offset);
663 
664         BUG_ON(!r->len);
665         BUG_ON(!r->page_size);
666         BUG_ON(!r->region_ops);
667 
668         INIT_LIST_HEAD(&r->chunk_list.head);
669         spin_lock_init(&r->chunk_list.lock);
670 
671         result = lv1_allocate_device_dma_region(r->dev->bus_id, r->dev->dev_id,
672                 roundup_pow_of_two(r->len), r->page_size, r->region_type,
673                 &bus_addr);
674         r->bus_addr = bus_addr;
675 
676         if (result) {
677                 DBG("%s:%d: lv1_allocate_device_dma_region failed: %s\n",
678                         __func__, __LINE__, ps3_result(result));
679                 r->len = r->bus_addr = 0;
680         }
681 
682         return result;
683 }
684 
685 static int dma_ioc0_region_create(struct ps3_dma_region *r)
686 {
687         int result;
688         u64 bus_addr;
689 
690         INIT_LIST_HEAD(&r->chunk_list.head);
691         spin_lock_init(&r->chunk_list.lock);
692 
693         result = lv1_allocate_io_segment(0,
694                                          r->len,
695                                          r->page_size,
696                                          &bus_addr);
697         r->bus_addr = bus_addr;
698         if (result) {
699                 DBG("%s:%d: lv1_allocate_io_segment failed: %s\n",
700                         __func__, __LINE__, ps3_result(result));
701                 r->len = r->bus_addr = 0;
702         }
703         DBG("%s: len=%#lx, pg=%d, bus=%#lx\n", __func__,
704             r->len, r->page_size, r->bus_addr);
705         return result;
706 }
707 
708 /**
709  * dma_region_free - Free a device dma region.
710  * @r: Pointer to a struct ps3_dma_region.
711  *
712  * This is the lowest level dma region free routine, and is the one that
713  * will make the HV call to free the region.
714  */
715 
716 static int dma_sb_region_free(struct ps3_dma_region *r)
717 {
718         int result;
719         struct dma_chunk *c;
720         struct dma_chunk *tmp;
721 
722         BUG_ON(!r);
723 
724         if (!r->dev->bus_id) {
725                 pr_info("%s:%d: %llu:%llu no dma\n", __func__, __LINE__,
726                         r->dev->bus_id, r->dev->dev_id);
727                 return 0;
728         }
729 
730         list_for_each_entry_safe(c, tmp, &r->chunk_list.head, link) {
731                 list_del(&c->link);
732                 dma_sb_free_chunk(c);
733         }
734 
735         result = lv1_free_device_dma_region(r->dev->bus_id, r->dev->dev_id,
736                 r->bus_addr);
737 
738         if (result)
739                 DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
740                         __func__, __LINE__, ps3_result(result));
741 
742         r->bus_addr = 0;
743 
744         return result;
745 }
746 
747 static int dma_ioc0_region_free(struct ps3_dma_region *r)
748 {
749         int result;
750         struct dma_chunk *c, *n;
751 
752         DBG("%s: start\n", __func__);
753         list_for_each_entry_safe(c, n, &r->chunk_list.head, link) {
754                 list_del(&c->link);
755                 dma_ioc0_free_chunk(c);
756         }
757 
758         result = lv1_release_io_segment(0, r->bus_addr);
759 
760         if (result)
761                 DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
762                         __func__, __LINE__, ps3_result(result));
763 
764         r->bus_addr = 0;
765         DBG("%s: end\n", __func__);
766 
767         return result;
768 }
769 
770 /**
771  * dma_sb_map_area - Map an area of memory into a device dma region.
772  * @r: Pointer to a struct ps3_dma_region.
773  * @virt_addr: Starting virtual address of the area to map.
774  * @len: Length in bytes of the area to map.
775  * @bus_addr: A pointer to return the starting ioc bus address of the area to
776  * map.
777  *
778  * This is the common dma mapping routine.
779  */
780 
781 static int dma_sb_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
782            unsigned long len, dma_addr_t *bus_addr,
783            u64 iopte_flag)
784 {
785         int result;
786         unsigned long flags;
787         struct dma_chunk *c;
788         unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
789                 : virt_addr;
790         unsigned long aligned_phys = _ALIGN_DOWN(phys_addr, 1 << r->page_size);
791         unsigned long aligned_len = _ALIGN_UP(len + phys_addr - aligned_phys,
792                                               1 << r->page_size);
793         *bus_addr = dma_sb_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
794 
795         if (!USE_DYNAMIC_DMA) {
796                 unsigned long lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
797                 DBG(" -> %s:%d\n", __func__, __LINE__);
798                 DBG("%s:%d virt_addr %lxh\n", __func__, __LINE__,
799                         virt_addr);
800                 DBG("%s:%d phys_addr %lxh\n", __func__, __LINE__,
801                         phys_addr);
802                 DBG("%s:%d lpar_addr %lxh\n", __func__, __LINE__,
803                         lpar_addr);
804                 DBG("%s:%d len       %lxh\n", __func__, __LINE__, len);
805                 DBG("%s:%d bus_addr  %llxh (%lxh)\n", __func__, __LINE__,
806                 *bus_addr, len);
807         }
808 
809         spin_lock_irqsave(&r->chunk_list.lock, flags);
810         c = dma_find_chunk(r, *bus_addr, len);
811 
812         if (c) {
813                 DBG("%s:%d: reusing mapped chunk", __func__, __LINE__);
814                 dma_dump_chunk(c);
815                 c->usage_count++;
816                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
817                 return 0;
818         }
819 
820         result = dma_sb_map_pages(r, aligned_phys, aligned_len, &c, iopte_flag);
821 
822         if (result) {
823                 *bus_addr = 0;
824                 DBG("%s:%d: dma_sb_map_pages failed (%d)\n",
825                         __func__, __LINE__, result);
826                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
827                 return result;
828         }
829 
830         c->usage_count = 1;
831 
832         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
833         return result;
834 }
835 
836 static int dma_ioc0_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
837              unsigned long len, dma_addr_t *bus_addr,
838              u64 iopte_flag)
839 {
840         int result;
841         unsigned long flags;
842         struct dma_chunk *c;
843         unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
844                 : virt_addr;
845         unsigned long aligned_phys = _ALIGN_DOWN(phys_addr, 1 << r->page_size);
846         unsigned long aligned_len = _ALIGN_UP(len + phys_addr - aligned_phys,
847                                               1 << r->page_size);
848 
849         DBG(KERN_ERR "%s: vaddr=%#lx, len=%#lx\n", __func__,
850             virt_addr, len);
851         DBG(KERN_ERR "%s: ph=%#lx a_ph=%#lx a_l=%#lx\n", __func__,
852             phys_addr, aligned_phys, aligned_len);
853 
854         spin_lock_irqsave(&r->chunk_list.lock, flags);
855         c = dma_find_chunk_lpar(r, ps3_mm_phys_to_lpar(phys_addr), len);
856 
857         if (c) {
858                 /* FIXME */
859                 BUG();
860                 *bus_addr = c->bus_addr + phys_addr - aligned_phys;
861                 c->usage_count++;
862                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
863                 return 0;
864         }
865 
866         result = dma_ioc0_map_pages(r, aligned_phys, aligned_len, &c,
867                                     iopte_flag);
868 
869         if (result) {
870                 *bus_addr = 0;
871                 DBG("%s:%d: dma_ioc0_map_pages failed (%d)\n",
872                         __func__, __LINE__, result);
873                 spin_unlock_irqrestore(&r->chunk_list.lock, flags);
874                 return result;
875         }
876         *bus_addr = c->bus_addr + phys_addr - aligned_phys;
877         DBG("%s: va=%#lx pa=%#lx a_pa=%#lx bus=%#llx\n", __func__,
878             virt_addr, phys_addr, aligned_phys, *bus_addr);
879         c->usage_count = 1;
880 
881         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
882         return result;
883 }
884 
885 /**
886  * dma_sb_unmap_area - Unmap an area of memory from a device dma region.
887  * @r: Pointer to a struct ps3_dma_region.
888  * @bus_addr: The starting ioc bus address of the area to unmap.
889  * @len: Length in bytes of the area to unmap.
890  *
891  * This is the common dma unmap routine.
892  */
893 
894 static int dma_sb_unmap_area(struct ps3_dma_region *r, dma_addr_t bus_addr,
895         unsigned long len)
896 {
897         unsigned long flags;
898         struct dma_chunk *c;
899 
900         spin_lock_irqsave(&r->chunk_list.lock, flags);
901         c = dma_find_chunk(r, bus_addr, len);
902 
903         if (!c) {
904                 unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
905                         1 << r->page_size);
906                 unsigned long aligned_len = _ALIGN_UP(len + bus_addr
907                         - aligned_bus, 1 << r->page_size);
908                 DBG("%s:%d: not found: bus_addr %llxh\n",
909                         __func__, __LINE__, bus_addr);
910                 DBG("%s:%d: not found: len %lxh\n",
911                         __func__, __LINE__, len);
912                 DBG("%s:%d: not found: aligned_bus %lxh\n",
913                         __func__, __LINE__, aligned_bus);
914                 DBG("%s:%d: not found: aligned_len %lxh\n",
915                         __func__, __LINE__, aligned_len);
916                 BUG();
917         }
918 
919         c->usage_count--;
920 
921         if (!c->usage_count) {
922                 list_del(&c->link);
923                 dma_sb_free_chunk(c);
924         }
925 
926         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
927         return 0;
928 }
929 
930 static int dma_ioc0_unmap_area(struct ps3_dma_region *r,
931                         dma_addr_t bus_addr, unsigned long len)
932 {
933         unsigned long flags;
934         struct dma_chunk *c;
935 
936         DBG("%s: start a=%#llx l=%#lx\n", __func__, bus_addr, len);
937         spin_lock_irqsave(&r->chunk_list.lock, flags);
938         c = dma_find_chunk(r, bus_addr, len);
939 
940         if (!c) {
941                 unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
942                                                         1 << r->page_size);
943                 unsigned long aligned_len = _ALIGN_UP(len + bus_addr
944                                                       - aligned_bus,
945                                                       1 << r->page_size);
946                 DBG("%s:%d: not found: bus_addr %llxh\n",
947                     __func__, __LINE__, bus_addr);
948                 DBG("%s:%d: not found: len %lxh\n",
949                     __func__, __LINE__, len);
950                 DBG("%s:%d: not found: aligned_bus %lxh\n",
951                     __func__, __LINE__, aligned_bus);
952                 DBG("%s:%d: not found: aligned_len %lxh\n",
953                     __func__, __LINE__, aligned_len);
954                 BUG();
955         }
956 
957         c->usage_count--;
958 
959         if (!c->usage_count) {
960                 list_del(&c->link);
961                 dma_ioc0_free_chunk(c);
962         }
963 
964         spin_unlock_irqrestore(&r->chunk_list.lock, flags);
965         DBG("%s: end\n", __func__);
966         return 0;
967 }
968 
969 /**
970  * dma_sb_region_create_linear - Setup a linear dma mapping for a device.
971  * @r: Pointer to a struct ps3_dma_region.
972  *
973  * This routine creates an HV dma region for the device and maps all available
974  * ram into the io controller bus address space.
975  */
976 
977 static int dma_sb_region_create_linear(struct ps3_dma_region *r)
978 {
979         int result;
980         unsigned long virt_addr, len;
981         dma_addr_t tmp;
982 
983         if (r->len > 16*1024*1024) {    /* FIXME: need proper fix */
984                 /* force 16M dma pages for linear mapping */
985                 if (r->page_size != PS3_DMA_16M) {
986                         pr_info("%s:%d: forcing 16M pages for linear map\n",
987                                 __func__, __LINE__);
988                         r->page_size = PS3_DMA_16M;
989                         r->len = _ALIGN_UP(r->len, 1 << r->page_size);
990                 }
991         }
992 
993         result = dma_sb_region_create(r);
994         BUG_ON(result);
995 
996         if (r->offset < map.rm.size) {
997                 /* Map (part of) 1st RAM chunk */
998                 virt_addr = map.rm.base + r->offset;
999                 len = map.rm.size - r->offset;
1000                 if (len > r->len)
1001                         len = r->len;
1002                 result = dma_sb_map_area(r, virt_addr, len, &tmp,
1003                         CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_SO_RW |
1004                         CBE_IOPTE_M);
1005                 BUG_ON(result);
1006         }
1007 
1008         if (r->offset + r->len > map.rm.size) {
1009                 /* Map (part of) 2nd RAM chunk */
1010                 virt_addr = map.rm.size;
1011                 len = r->len;
1012                 if (r->offset >= map.rm.size)
1013                         virt_addr += r->offset - map.rm.size;
1014                 else
1015                         len -= map.rm.size - r->offset;
1016                 result = dma_sb_map_area(r, virt_addr, len, &tmp,
1017                         CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_SO_RW |
1018                         CBE_IOPTE_M);
1019                 BUG_ON(result);
1020         }
1021 
1022         return result;
1023 }
1024 
1025 /**
1026  * dma_sb_region_free_linear - Free a linear dma mapping for a device.
1027  * @r: Pointer to a struct ps3_dma_region.
1028  *
1029  * This routine will unmap all mapped areas and free the HV dma region.
1030  */
1031 
1032 static int dma_sb_region_free_linear(struct ps3_dma_region *r)
1033 {
1034         int result;
1035         dma_addr_t bus_addr;
1036         unsigned long len, lpar_addr;
1037 
1038         if (r->offset < map.rm.size) {
1039                 /* Unmap (part of) 1st RAM chunk */
1040                 lpar_addr = map.rm.base + r->offset;
1041                 len = map.rm.size - r->offset;
1042                 if (len > r->len)
1043                         len = r->len;
1044                 bus_addr = dma_sb_lpar_to_bus(r, lpar_addr);
1045                 result = dma_sb_unmap_area(r, bus_addr, len);
1046                 BUG_ON(result);
1047         }
1048 
1049         if (r->offset + r->len > map.rm.size) {
1050                 /* Unmap (part of) 2nd RAM chunk */
1051                 lpar_addr = map.r1.base;
1052                 len = r->len;
1053                 if (r->offset >= map.rm.size)
1054                         lpar_addr += r->offset - map.rm.size;
1055                 else
1056                         len -= map.rm.size - r->offset;
1057                 bus_addr = dma_sb_lpar_to_bus(r, lpar_addr);
1058                 result = dma_sb_unmap_area(r, bus_addr, len);
1059                 BUG_ON(result);
1060         }
1061 
1062         result = dma_sb_region_free(r);
1063         BUG_ON(result);
1064 
1065         return result;
1066 }
1067 
1068 /**
1069  * dma_sb_map_area_linear - Map an area of memory into a device dma region.
1070  * @r: Pointer to a struct ps3_dma_region.
1071  * @virt_addr: Starting virtual address of the area to map.
1072  * @len: Length in bytes of the area to map.
1073  * @bus_addr: A pointer to return the starting ioc bus address of the area to
1074  * map.
1075  *
1076  * This routine just returns the corresponding bus address.  Actual mapping
1077  * occurs in dma_region_create_linear().
1078  */
1079 
1080 static int dma_sb_map_area_linear(struct ps3_dma_region *r,
1081         unsigned long virt_addr, unsigned long len, dma_addr_t *bus_addr,
1082         u64 iopte_flag)
1083 {
1084         unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
1085                 : virt_addr;
1086         *bus_addr = dma_sb_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
1087         return 0;
1088 }
1089 
1090 /**
1091  * dma_unmap_area_linear - Unmap an area of memory from a device dma region.
1092  * @r: Pointer to a struct ps3_dma_region.
1093  * @bus_addr: The starting ioc bus address of the area to unmap.
1094  * @len: Length in bytes of the area to unmap.
1095  *
1096  * This routine does nothing.  Unmapping occurs in dma_sb_region_free_linear().
1097  */
1098 
1099 static int dma_sb_unmap_area_linear(struct ps3_dma_region *r,
1100         dma_addr_t bus_addr, unsigned long len)
1101 {
1102         return 0;
1103 };
1104 
1105 static const struct ps3_dma_region_ops ps3_dma_sb_region_ops =  {
1106         .create = dma_sb_region_create,
1107         .free = dma_sb_region_free,
1108         .map = dma_sb_map_area,
1109         .unmap = dma_sb_unmap_area
1110 };
1111 
1112 static const struct ps3_dma_region_ops ps3_dma_sb_region_linear_ops = {
1113         .create = dma_sb_region_create_linear,
1114         .free = dma_sb_region_free_linear,
1115         .map = dma_sb_map_area_linear,
1116         .unmap = dma_sb_unmap_area_linear
1117 };
1118 
1119 static const struct ps3_dma_region_ops ps3_dma_ioc0_region_ops = {
1120         .create = dma_ioc0_region_create,
1121         .free = dma_ioc0_region_free,
1122         .map = dma_ioc0_map_area,
1123         .unmap = dma_ioc0_unmap_area
1124 };
1125 
1126 int ps3_dma_region_init(struct ps3_system_bus_device *dev,
1127         struct ps3_dma_region *r, enum ps3_dma_page_size page_size,
1128         enum ps3_dma_region_type region_type, void *addr, unsigned long len)
1129 {
1130         unsigned long lpar_addr;
1131 
1132         lpar_addr = addr ? ps3_mm_phys_to_lpar(__pa(addr)) : 0;
1133 
1134         r->dev = dev;
1135         r->page_size = page_size;
1136         r->region_type = region_type;
1137         r->offset = lpar_addr;
1138         if (r->offset >= map.rm.size)
1139                 r->offset -= map.r1.offset;
1140         r->len = len ? len : _ALIGN_UP(map.total, 1 << r->page_size);
1141 
1142         switch (dev->dev_type) {
1143         case PS3_DEVICE_TYPE_SB:
1144                 r->region_ops =  (USE_DYNAMIC_DMA)
1145                         ? &ps3_dma_sb_region_ops
1146                         : &ps3_dma_sb_region_linear_ops;
1147                 break;
1148         case PS3_DEVICE_TYPE_IOC0:
1149                 r->region_ops = &ps3_dma_ioc0_region_ops;
1150                 break;
1151         default:
1152                 BUG();
1153                 return -EINVAL;
1154         }
1155         return 0;
1156 }
1157 EXPORT_SYMBOL(ps3_dma_region_init);
1158 
1159 int ps3_dma_region_create(struct ps3_dma_region *r)
1160 {
1161         BUG_ON(!r);
1162         BUG_ON(!r->region_ops);
1163         BUG_ON(!r->region_ops->create);
1164         return r->region_ops->create(r);
1165 }
1166 EXPORT_SYMBOL(ps3_dma_region_create);
1167 
1168 int ps3_dma_region_free(struct ps3_dma_region *r)
1169 {
1170         BUG_ON(!r);
1171         BUG_ON(!r->region_ops);
1172         BUG_ON(!r->region_ops->free);
1173         return r->region_ops->free(r);
1174 }
1175 EXPORT_SYMBOL(ps3_dma_region_free);
1176 
1177 int ps3_dma_map(struct ps3_dma_region *r, unsigned long virt_addr,
1178         unsigned long len, dma_addr_t *bus_addr,
1179         u64 iopte_flag)
1180 {
1181         return r->region_ops->map(r, virt_addr, len, bus_addr, iopte_flag);
1182 }
1183 
1184 int ps3_dma_unmap(struct ps3_dma_region *r, dma_addr_t bus_addr,
1185         unsigned long len)
1186 {
1187         return r->region_ops->unmap(r, bus_addr, len);
1188 }
1189 
1190 /*============================================================================*/
1191 /* system startup routines                                                    */
1192 /*============================================================================*/
1193 
1194 /**
1195  * ps3_mm_init - initialize the address space state variables
1196  */
1197 
1198 void __init ps3_mm_init(void)
1199 {
1200         int result;
1201 
1202         DBG(" -> %s:%d\n", __func__, __LINE__);
1203 
1204         result = ps3_repository_read_mm_info(&map.rm.base, &map.rm.size,
1205                 &map.total);
1206 
1207         if (result)
1208                 panic("ps3_repository_read_mm_info() failed");
1209 
1210         map.rm.offset = map.rm.base;
1211         map.vas_id = map.htab_size = 0;
1212 
1213         /* this implementation assumes map.rm.base is zero */
1214 
1215         BUG_ON(map.rm.base);
1216         BUG_ON(!map.rm.size);
1217 
1218         /* Check if we got the highmem region from an earlier boot step */
1219 
1220         if (ps3_mm_get_repository_highmem(&map.r1)) {
1221                 result = ps3_mm_region_create(&map.r1, map.total - map.rm.size);
1222 
1223                 if (!result)
1224                         ps3_mm_set_repository_highmem(&map.r1);
1225         }
1226 
1227         /* correct map.total for the real total amount of memory we use */
1228         map.total = map.rm.size + map.r1.size;
1229 
1230         if (!map.r1.size) {
1231                 DBG("%s:%d: No highmem region found\n", __func__, __LINE__);
1232         } else {
1233                 DBG("%s:%d: Adding highmem region: %llxh %llxh\n",
1234                         __func__, __LINE__, map.rm.size,
1235                         map.total - map.rm.size);
1236                 memblock_add(map.rm.size, map.total - map.rm.size);
1237         }
1238 
1239         DBG(" <- %s:%d\n", __func__, __LINE__);
1240 }
1241 
1242 /**
1243  * ps3_mm_shutdown - final cleanup of address space
1244  */
1245 
1246 void ps3_mm_shutdown(void)
1247 {
1248         ps3_mm_region_destroy(&map.r1);
1249 }
1250 

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