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21#include <linux/init.h>
22#include <linux/gfp.h>
23#include <linux/mm.h>
24#include <linux/pci.h>
25#include <linux/proc_fs.h>
26#include <linux/seq_file.h>
27#include <linux/string.h>
28#include <linux/types.h>
29#include <linux/scatterlist.h>
30#include <linux/export.h>
31
32#include <asm/cacheflush.h>
33#include <asm/dma.h>
34#include <asm/io.h>
35#include <asm/page.h>
36#include <asm/pgalloc.h>
37#include <linux/uaccess.h>
38#include <asm/tlbflush.h>
39
40static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
41static unsigned long pcxl_used_bytes __read_mostly = 0;
42static unsigned long pcxl_used_pages __read_mostly = 0;
43
44extern unsigned long pcxl_dma_start;
45static DEFINE_SPINLOCK(pcxl_res_lock);
46static char *pcxl_res_map;
47static int pcxl_res_hint;
48static int pcxl_res_size;
49
50#ifdef DEBUG_PCXL_RESOURCE
51#define DBG_RES(x...) printk(x)
52#else
53#define DBG_RES(x...)
54#endif
55
56
57
58
59
60
61#ifdef DUMP_RESMAP
62static
63void dump_resmap(void)
64{
65 u_long *res_ptr = (unsigned long *)pcxl_res_map;
66 u_long i = 0;
67
68 printk("res_map: ");
69 for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
70 printk("%08lx ", *res_ptr);
71
72 printk("\n");
73}
74#else
75static inline void dump_resmap(void) {;}
76#endif
77
78static inline int map_pte_uncached(pte_t * pte,
79 unsigned long vaddr,
80 unsigned long size, unsigned long *paddr_ptr)
81{
82 unsigned long end;
83 unsigned long orig_vaddr = vaddr;
84
85 vaddr &= ~PMD_MASK;
86 end = vaddr + size;
87 if (end > PMD_SIZE)
88 end = PMD_SIZE;
89 do {
90 unsigned long flags;
91
92 if (!pte_none(*pte))
93 printk(KERN_ERR "map_pte_uncached: page already exists\n");
94 purge_tlb_start(flags);
95 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
96 pdtlb_kernel(orig_vaddr);
97 purge_tlb_end(flags);
98 vaddr += PAGE_SIZE;
99 orig_vaddr += PAGE_SIZE;
100 (*paddr_ptr) += PAGE_SIZE;
101 pte++;
102 } while (vaddr < end);
103 return 0;
104}
105
106static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
107 unsigned long size, unsigned long *paddr_ptr)
108{
109 unsigned long end;
110 unsigned long orig_vaddr = vaddr;
111
112 vaddr &= ~PGDIR_MASK;
113 end = vaddr + size;
114 if (end > PGDIR_SIZE)
115 end = PGDIR_SIZE;
116 do {
117 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
118 if (!pte)
119 return -ENOMEM;
120 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
121 return -ENOMEM;
122 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
123 orig_vaddr += PMD_SIZE;
124 pmd++;
125 } while (vaddr < end);
126 return 0;
127}
128
129static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
130 unsigned long paddr)
131{
132 pgd_t * dir;
133 unsigned long end = vaddr + size;
134
135 dir = pgd_offset_k(vaddr);
136 do {
137 pmd_t *pmd;
138
139 pmd = pmd_alloc(NULL, dir, vaddr);
140 if (!pmd)
141 return -ENOMEM;
142 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
143 return -ENOMEM;
144 vaddr = vaddr + PGDIR_SIZE;
145 dir++;
146 } while (vaddr && (vaddr < end));
147 return 0;
148}
149
150static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
151 unsigned long size)
152{
153 pte_t * pte;
154 unsigned long end;
155 unsigned long orig_vaddr = vaddr;
156
157 if (pmd_none(*pmd))
158 return;
159 if (pmd_bad(*pmd)) {
160 pmd_ERROR(*pmd);
161 pmd_clear(pmd);
162 return;
163 }
164 pte = pte_offset_map(pmd, vaddr);
165 vaddr &= ~PMD_MASK;
166 end = vaddr + size;
167 if (end > PMD_SIZE)
168 end = PMD_SIZE;
169 do {
170 unsigned long flags;
171 pte_t page = *pte;
172
173 pte_clear(&init_mm, vaddr, pte);
174 purge_tlb_start(flags);
175 pdtlb_kernel(orig_vaddr);
176 purge_tlb_end(flags);
177 vaddr += PAGE_SIZE;
178 orig_vaddr += PAGE_SIZE;
179 pte++;
180 if (pte_none(page) || pte_present(page))
181 continue;
182 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
183 } while (vaddr < end);
184}
185
186static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
187 unsigned long size)
188{
189 pmd_t * pmd;
190 unsigned long end;
191 unsigned long orig_vaddr = vaddr;
192
193 if (pgd_none(*dir))
194 return;
195 if (pgd_bad(*dir)) {
196 pgd_ERROR(*dir);
197 pgd_clear(dir);
198 return;
199 }
200 pmd = pmd_offset(dir, vaddr);
201 vaddr &= ~PGDIR_MASK;
202 end = vaddr + size;
203 if (end > PGDIR_SIZE)
204 end = PGDIR_SIZE;
205 do {
206 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
207 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
208 orig_vaddr += PMD_SIZE;
209 pmd++;
210 } while (vaddr < end);
211}
212
213static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
214{
215 pgd_t * dir;
216 unsigned long end = vaddr + size;
217
218 dir = pgd_offset_k(vaddr);
219 do {
220 unmap_uncached_pmd(dir, vaddr, end - vaddr);
221 vaddr = vaddr + PGDIR_SIZE;
222 dir++;
223 } while (vaddr && (vaddr < end));
224}
225
226#define PCXL_SEARCH_LOOP(idx, mask, size) \
227 for(; res_ptr < res_end; ++res_ptr) \
228 { \
229 if(0 == ((*res_ptr) & mask)) { \
230 *res_ptr |= mask; \
231 idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
232 pcxl_res_hint = idx + (size >> 3); \
233 goto resource_found; \
234 } \
235 }
236
237#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
238 u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
239 u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
240 PCXL_SEARCH_LOOP(idx, mask, size); \
241 res_ptr = (u##size *)&pcxl_res_map[0]; \
242 PCXL_SEARCH_LOOP(idx, mask, size); \
243}
244
245unsigned long
246pcxl_alloc_range(size_t size)
247{
248 int res_idx;
249 u_long mask, flags;
250 unsigned int pages_needed = size >> PAGE_SHIFT;
251
252 mask = (u_long) -1L;
253 mask >>= BITS_PER_LONG - pages_needed;
254
255 DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
256 size, pages_needed, mask);
257
258 spin_lock_irqsave(&pcxl_res_lock, flags);
259
260 if(pages_needed <= 8) {
261 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
262 } else if(pages_needed <= 16) {
263 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
264 } else if(pages_needed <= 32) {
265 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
266 } else {
267 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
268 __FILE__);
269 }
270
271 dump_resmap();
272 panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
273 __FILE__);
274
275resource_found:
276
277 DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
278 res_idx, mask, pcxl_res_hint);
279
280 pcxl_used_pages += pages_needed;
281 pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
282
283 spin_unlock_irqrestore(&pcxl_res_lock, flags);
284
285 dump_resmap();
286
287
288
289
290 return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
291}
292
293#define PCXL_FREE_MAPPINGS(idx, m, size) \
294 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
295 \
296 *res_ptr &= ~m;
297
298
299
300
301static void
302pcxl_free_range(unsigned long vaddr, size_t size)
303{
304 u_long mask, flags;
305 unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
306 unsigned int pages_mapped = size >> PAGE_SHIFT;
307
308 mask = (u_long) -1L;
309 mask >>= BITS_PER_LONG - pages_mapped;
310
311 DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
312 res_idx, size, pages_mapped, mask);
313
314 spin_lock_irqsave(&pcxl_res_lock, flags);
315
316 if(pages_mapped <= 8) {
317 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
318 } else if(pages_mapped <= 16) {
319 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
320 } else if(pages_mapped <= 32) {
321 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
322 } else {
323 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
324 __FILE__);
325 }
326
327 pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
328 pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
329
330 spin_unlock_irqrestore(&pcxl_res_lock, flags);
331
332 dump_resmap();
333}
334
335static int proc_pcxl_dma_show(struct seq_file *m, void *v)
336{
337#if 0
338 u_long i = 0;
339 unsigned long *res_ptr = (u_long *)pcxl_res_map;
340#endif
341 unsigned long total_pages = pcxl_res_size << 3;
342
343 seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
344 PCXL_DMA_MAP_SIZE, total_pages);
345
346 seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
347
348 seq_puts(m, " total: free: used: % used:\n");
349 seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
350 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
351 (pcxl_used_bytes * 100) / pcxl_res_size);
352
353 seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
354 total_pages - pcxl_used_pages, pcxl_used_pages,
355 (pcxl_used_pages * 100 / total_pages));
356
357#if 0
358 seq_puts(m, "\nResource bitmap:");
359
360 for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
361 if ((i & 7) == 0)
362 seq_puts(m,"\n ");
363 seq_printf(m, "%s %08lx", buf, *res_ptr);
364 }
365#endif
366 seq_putc(m, '\n');
367 return 0;
368}
369
370static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
371{
372 return single_open(file, proc_pcxl_dma_show, NULL);
373}
374
375static const struct file_operations proc_pcxl_dma_ops = {
376 .owner = THIS_MODULE,
377 .open = proc_pcxl_dma_open,
378 .read = seq_read,
379 .llseek = seq_lseek,
380 .release = single_release,
381};
382
383static int __init
384pcxl_dma_init(void)
385{
386 if (pcxl_dma_start == 0)
387 return 0;
388
389 pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
390 pcxl_res_hint = 0;
391 pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
392 get_order(pcxl_res_size));
393 memset(pcxl_res_map, 0, pcxl_res_size);
394 proc_gsc_root = proc_mkdir("gsc", NULL);
395 if (!proc_gsc_root)
396 printk(KERN_WARNING
397 "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
398 else {
399 struct proc_dir_entry* ent;
400 ent = proc_create("pcxl_dma", 0, proc_gsc_root,
401 &proc_pcxl_dma_ops);
402 if (!ent)
403 printk(KERN_WARNING
404 "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
405 }
406 return 0;
407}
408
409__initcall(pcxl_dma_init);
410
411static void *pa11_dma_alloc(struct device *dev, size_t size,
412 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
413{
414 unsigned long vaddr;
415 unsigned long paddr;
416 int order;
417
418 order = get_order(size);
419 size = 1 << (order + PAGE_SHIFT);
420 vaddr = pcxl_alloc_range(size);
421 paddr = __get_free_pages(flag, order);
422 flush_kernel_dcache_range(paddr, size);
423 paddr = __pa(paddr);
424 map_uncached_pages(vaddr, size, paddr);
425 *dma_handle = (dma_addr_t) paddr;
426
427#if 0
428
429
430
431
432 if (!dev || *dev->coherent_dma_mask < 0xffffffff)
433 gfp |= GFP_DMA;
434#endif
435 return (void *)vaddr;
436}
437
438static void pa11_dma_free(struct device *dev, size_t size, void *vaddr,
439 dma_addr_t dma_handle, unsigned long attrs)
440{
441 int order;
442
443 order = get_order(size);
444 size = 1 << (order + PAGE_SHIFT);
445 unmap_uncached_pages((unsigned long)vaddr, size);
446 pcxl_free_range((unsigned long)vaddr, size);
447 free_pages((unsigned long)__va(dma_handle), order);
448}
449
450static dma_addr_t pa11_dma_map_page(struct device *dev, struct page *page,
451 unsigned long offset, size_t size,
452 enum dma_data_direction direction, unsigned long attrs)
453{
454 void *addr = page_address(page) + offset;
455 BUG_ON(direction == DMA_NONE);
456
457 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
458 flush_kernel_dcache_range((unsigned long) addr, size);
459
460 return virt_to_phys(addr);
461}
462
463static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
464 size_t size, enum dma_data_direction direction,
465 unsigned long attrs)
466{
467 BUG_ON(direction == DMA_NONE);
468
469 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
470 return;
471
472 if (direction == DMA_TO_DEVICE)
473 return;
474
475
476
477
478
479
480
481 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
482}
483
484static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist,
485 int nents, enum dma_data_direction direction,
486 unsigned long attrs)
487{
488 int i;
489 struct scatterlist *sg;
490
491 BUG_ON(direction == DMA_NONE);
492
493 for_each_sg(sglist, sg, nents, i) {
494 unsigned long vaddr = (unsigned long)sg_virt(sg);
495
496 sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
497 sg_dma_len(sg) = sg->length;
498
499 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
500 continue;
501
502 flush_kernel_dcache_range(vaddr, sg->length);
503 }
504 return nents;
505}
506
507static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
508 int nents, enum dma_data_direction direction,
509 unsigned long attrs)
510{
511 int i;
512 struct scatterlist *sg;
513
514 BUG_ON(direction == DMA_NONE);
515
516 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
517 return;
518
519 if (direction == DMA_TO_DEVICE)
520 return;
521
522
523
524 for_each_sg(sglist, sg, nents, i)
525 flush_kernel_vmap_range(sg_virt(sg), sg->length);
526}
527
528static void pa11_dma_sync_single_for_cpu(struct device *dev,
529 dma_addr_t dma_handle, size_t size,
530 enum dma_data_direction direction)
531{
532 BUG_ON(direction == DMA_NONE);
533
534 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
535 size);
536}
537
538static void pa11_dma_sync_single_for_device(struct device *dev,
539 dma_addr_t dma_handle, size_t size,
540 enum dma_data_direction direction)
541{
542 BUG_ON(direction == DMA_NONE);
543
544 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
545 size);
546}
547
548static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
549{
550 int i;
551 struct scatterlist *sg;
552
553
554
555 for_each_sg(sglist, sg, nents, i)
556 flush_kernel_vmap_range(sg_virt(sg), sg->length);
557}
558
559static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
560{
561 int i;
562 struct scatterlist *sg;
563
564
565
566 for_each_sg(sglist, sg, nents, i)
567 flush_kernel_vmap_range(sg_virt(sg), sg->length);
568}
569
570static void pa11_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
571 enum dma_data_direction direction)
572{
573 flush_kernel_dcache_range((unsigned long)vaddr, size);
574}
575
576const struct dma_map_ops pcxl_dma_ops = {
577 .alloc = pa11_dma_alloc,
578 .free = pa11_dma_free,
579 .map_page = pa11_dma_map_page,
580 .unmap_page = pa11_dma_unmap_page,
581 .map_sg = pa11_dma_map_sg,
582 .unmap_sg = pa11_dma_unmap_sg,
583 .sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
584 .sync_single_for_device = pa11_dma_sync_single_for_device,
585 .sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
586 .sync_sg_for_device = pa11_dma_sync_sg_for_device,
587 .cache_sync = pa11_dma_cache_sync,
588};
589
590static void *pcx_dma_alloc(struct device *dev, size_t size,
591 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
592{
593 void *addr;
594
595 if ((attrs & DMA_ATTR_NON_CONSISTENT) == 0)
596 return NULL;
597
598 addr = (void *)__get_free_pages(flag, get_order(size));
599 if (addr)
600 *dma_handle = (dma_addr_t)virt_to_phys(addr);
601
602 return addr;
603}
604
605static void pcx_dma_free(struct device *dev, size_t size, void *vaddr,
606 dma_addr_t iova, unsigned long attrs)
607{
608 free_pages((unsigned long)vaddr, get_order(size));
609 return;
610}
611
612const struct dma_map_ops pcx_dma_ops = {
613 .alloc = pcx_dma_alloc,
614 .free = pcx_dma_free,
615 .map_page = pa11_dma_map_page,
616 .unmap_page = pa11_dma_unmap_page,
617 .map_sg = pa11_dma_map_sg,
618 .unmap_sg = pa11_dma_unmap_sg,
619 .sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
620 .sync_single_for_device = pa11_dma_sync_single_for_device,
621 .sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
622 .sync_sg_for_device = pa11_dma_sync_sg_for_device,
623 .cache_sync = pa11_dma_cache_sync,
624};
625