projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / arch / sparc64 / kernel / pci_sun4v.c
1 /* pci_sun4v.c: SUN4V specific PCI controller support.
2 *
3 * Copyright (C) 2006, 2007, 2008 David S. Miller (davem@davemloft.net)
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/pci.h>
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/interrupt.h>
12 #include <linux/percpu.h>
13 #include <linux/irq.h>
14 #include <linux/msi.h>
15 #include <linux/log2.h>
16
17 #include <asm/iommu.h>
18 #include <asm/irq.h>
19 #include <asm/upa.h>
20 #include <asm/pstate.h>
21 #include <asm/oplib.h>
22 #include <asm/hypervisor.h>
23 #include <asm/prom.h>
24
25 #include "pci_impl.h"
26 #include "iommu_common.h"
27
28 #include "pci_sun4v.h"
29
30 static unsigned long vpci_major = 1;
31 static unsigned long vpci_minor = 1;
32
33 #define PGLIST_NENTS (PAGE_SIZE / sizeof(u64))
34
35 struct iommu_batch {
36 struct device *dev; /* Device mapping is for. */
37 unsigned long prot; /* IOMMU page protections */
38 unsigned long entry; /* Index into IOTSB. */
39 u64 *pglist; /* List of physical pages */
40 unsigned long npages; /* Number of pages in list. */
41 };
42
43 static DEFINE_PER_CPU(struct iommu_batch, iommu_batch);
44
45 /* Interrupts must be disabled. */
46 static inline void iommu_batch_start(struct device *dev, unsigned long prot, unsigned long entry)
47 {
48 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
49
50 p->dev = dev;
51 p->prot = prot;
52 p->entry = entry;
53 p->npages = 0;
54 }
55
56 /* Interrupts must be disabled. */
57 static long iommu_batch_flush(struct iommu_batch *p)
58 {
59 struct pci_pbm_info *pbm = p->dev->archdata.host_controller;
60 unsigned long devhandle = pbm->devhandle;
61 unsigned long prot = p->prot;
62 unsigned long entry = p->entry;
63 u64 *pglist = p->pglist;
64 unsigned long npages = p->npages;
65
66 while (npages != 0) {
67 long num;
68
69 num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry),
70 npages, prot, __pa(pglist));
71 if (unlikely(num < 0)) {
72 if (printk_ratelimit())
73 printk("iommu_batch_flush: IOMMU map of "
74 "[%08lx:%08lx:%lx:%lx:%lx] failed with "
75 "status %ld\n",
76 devhandle, HV_PCI_TSBID(0, entry),
77 npages, prot, __pa(pglist), num);
78 return -1;
79 }
80
81 entry += num;
82 npages -= num;
83 pglist += num;
84 }
85
86 p->entry = entry;
87 p->npages = 0;
88
89 return 0;
90 }
91
92 static inline void iommu_batch_new_entry(unsigned long entry)
93 {
94 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
95
96 if (p->entry + p->npages == entry)
97 return;
98 if (p->entry != ~0UL)
99 iommu_batch_flush(p);
100 p->entry = entry;
101 }
102
103 /* Interrupts must be disabled. */
104 static inline long iommu_batch_add(u64 phys_page)
105 {
106 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
107
108 BUG_ON(p->npages >= PGLIST_NENTS);
109
110 p->pglist[p->npages++] = phys_page;
111 if (p->npages == PGLIST_NENTS)
112 return iommu_batch_flush(p);
113
114 return 0;
115 }
116
117 /* Interrupts must be disabled. */
118 static inline long iommu_batch_end(void)
119 {
120 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
121
122 BUG_ON(p->npages >= PGLIST_NENTS);
123
124 return iommu_batch_flush(p);
125 }
126
127 static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
128 dma_addr_t *dma_addrp, gfp_t gfp)
129 {
130 unsigned long flags, order, first_page, npages, n;
131 struct iommu *iommu;
132 struct page *page;
133 void *ret;
134 long entry;
135 int nid;
136
137 size = IO_PAGE_ALIGN(size);
138 order = get_order(size);
139 if (unlikely(order >= MAX_ORDER))
140 return NULL;
141
142 npages = size >> IO_PAGE_SHIFT;
143
144 nid = dev->archdata.numa_node;
145 page = alloc_pages_node(nid, gfp, order);
146 if (unlikely(!page))
147 return NULL;
148
149 first_page = (unsigned long) page_address(page);
150 memset((char *)first_page, 0, PAGE_SIZE << order);
151
152 iommu = dev->archdata.iommu;
153
154 spin_lock_irqsave(&iommu->lock, flags);
155 entry = iommu_range_alloc(dev, iommu, npages, NULL);
156 spin_unlock_irqrestore(&iommu->lock, flags);
157
158 if (unlikely(entry == DMA_ERROR_CODE))
159 goto range_alloc_fail;
160
161 *dma_addrp = (iommu->page_table_map_base +
162 (entry << IO_PAGE_SHIFT));
163 ret = (void *) first_page;
164 first_page = __pa(first_page);
165
166 local_irq_save(flags);
167
168 iommu_batch_start(dev,
169 (HV_PCI_MAP_ATTR_READ |
170 HV_PCI_MAP_ATTR_WRITE),
171 entry);
172
173 for (n = 0; n < npages; n++) {
174 long err = iommu_batch_add(first_page + (n * PAGE_SIZE));
175 if (unlikely(err < 0L))
176 goto iommu_map_fail;
177 }
178
179 if (unlikely(iommu_batch_end() < 0L))
180 goto iommu_map_fail;
181
182 local_irq_restore(flags);
183
184 return ret;
185
186 iommu_map_fail:
187 /* Interrupts are disabled. */
188 spin_lock(&iommu->lock);
189 iommu_range_free(iommu, *dma_addrp, npages);
190 spin_unlock_irqrestore(&iommu->lock, flags);
191
192 range_alloc_fail:
193 free_pages(first_page, order);
194 return NULL;
195 }
196
197 static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
198 dma_addr_t dvma)
199 {
200 struct pci_pbm_info *pbm;
201 struct iommu *iommu;
202 unsigned long flags, order, npages, entry;
203 u32 devhandle;
204
205 npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
206 iommu = dev->archdata.iommu;
207 pbm = dev->archdata.host_controller;
208 devhandle = pbm->devhandle;
209 entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
210
211 spin_lock_irqsave(&iommu->lock, flags);
212
213 iommu_range_free(iommu, dvma, npages);
214
215 do {
216 unsigned long num;
217
218 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
219 npages);
220 entry += num;
221 npages -= num;
222 } while (npages != 0);
223
224 spin_unlock_irqrestore(&iommu->lock, flags);
225
226 order = get_order(size);
227 if (order < 10)
228 free_pages((unsigned long)cpu, order);
229 }
230
231 static dma_addr_t dma_4v_map_single(struct device *dev, void *ptr, size_t sz,
232 enum dma_data_direction direction)
233 {
234 struct iommu *iommu;
235 unsigned long flags, npages, oaddr;
236 unsigned long i, base_paddr;
237 u32 bus_addr, ret;
238 unsigned long prot;
239 long entry;
240
241 iommu = dev->archdata.iommu;
242
243 if (unlikely(direction == DMA_NONE))
244 goto bad;
245
246 oaddr = (unsigned long)ptr;
247 npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
248 npages >>= IO_PAGE_SHIFT;
249
250 spin_lock_irqsave(&iommu->lock, flags);
251 entry = iommu_range_alloc(dev, iommu, npages, NULL);
252 spin_unlock_irqrestore(&iommu->lock, flags);
253
254 if (unlikely(entry == DMA_ERROR_CODE))
255 goto bad;
256
257 bus_addr = (iommu->page_table_map_base +
258 (entry << IO_PAGE_SHIFT));
259 ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
260 base_paddr = __pa(oaddr & IO_PAGE_MASK);
261 prot = HV_PCI_MAP_ATTR_READ;
262 if (direction != DMA_TO_DEVICE)
263 prot |= HV_PCI_MAP_ATTR_WRITE;
264
265 local_irq_save(flags);
266
267 iommu_batch_start(dev, prot, entry);
268
269 for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
270 long err = iommu_batch_add(base_paddr);
271 if (unlikely(err < 0L))
272 goto iommu_map_fail;
273 }
274 if (unlikely(iommu_batch_end() < 0L))
275 goto iommu_map_fail;
276
277 local_irq_restore(flags);
278
279 return ret;
280
281 bad:
282 if (printk_ratelimit())
283 WARN_ON(1);
284 return DMA_ERROR_CODE;
285
286 iommu_map_fail:
287 /* Interrupts are disabled. */
288 spin_lock(&iommu->lock);
289 iommu_range_free(iommu, bus_addr, npages);
290 spin_unlock_irqrestore(&iommu->lock, flags);
291
292 return DMA_ERROR_CODE;
293 }
294
295 static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
296 size_t sz, enum dma_data_direction direction)
297 {
298 struct pci_pbm_info *pbm;
299 struct iommu *iommu;
300 unsigned long flags, npages;
301 long entry;
302 u32 devhandle;
303
304 if (unlikely(direction == DMA_NONE)) {
305 if (printk_ratelimit())
306 WARN_ON(1);
307 return;
308 }
309
310 iommu = dev->archdata.iommu;
311 pbm = dev->archdata.host_controller;
312 devhandle = pbm->devhandle;
313
314 npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
315 npages >>= IO_PAGE_SHIFT;
316 bus_addr &= IO_PAGE_MASK;
317
318 spin_lock_irqsave(&iommu->lock, flags);
319
320 iommu_range_free(iommu, bus_addr, npages);
321
322 entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
323 do {
324 unsigned long num;
325
326 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
327 npages);
328 entry += num;
329 npages -= num;
330 } while (npages != 0);
331
332 spin_unlock_irqrestore(&iommu->lock, flags);
333 }
334
335 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
336 int nelems, enum dma_data_direction direction)
337 {
338 struct scatterlist *s, *outs, *segstart;
339 unsigned long flags, handle, prot;
340 dma_addr_t dma_next = 0, dma_addr;
341 unsigned int max_seg_size;
342 unsigned long seg_boundary_size;
343 int outcount, incount, i;
344 struct iommu *iommu;
345 unsigned long base_shift;
346 long err;
347
348 BUG_ON(direction == DMA_NONE);
349
350 iommu = dev->archdata.iommu;
351 if (nelems == 0 || !iommu)
352 return 0;
353
354 prot = HV_PCI_MAP_ATTR_READ;
355 if (direction != DMA_TO_DEVICE)
356 prot |= HV_PCI_MAP_ATTR_WRITE;
357
358 outs = s = segstart = &sglist[0];
359 outcount = 1;
360 incount = nelems;
361 handle = 0;
362
363 /* Init first segment length for backout at failure */
364 outs->dma_length = 0;
365
366 spin_lock_irqsave(&iommu->lock, flags);
367
368 iommu_batch_start(dev, prot, ~0UL);
369
370 max_seg_size = dma_get_max_seg_size(dev);
371 seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
372 IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
373 base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
374 for_each_sg(sglist, s, nelems, i) {
375 unsigned long paddr, npages, entry, out_entry = 0, slen;
376
377 slen = s->length;
378 /* Sanity check */
379 if (slen == 0) {
380 dma_next = 0;
381 continue;
382 }
383 /* Allocate iommu entries for that segment */
384 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
385 npages = iommu_num_pages(paddr, slen);
386 entry = iommu_range_alloc(dev, iommu, npages, &handle);
387
388 /* Handle failure */
389 if (unlikely(entry == DMA_ERROR_CODE)) {
390 if (printk_ratelimit())
391 printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
392 " npages %lx\n", iommu, paddr, npages);
393 goto iommu_map_failed;
394 }
395
396 iommu_batch_new_entry(entry);
397
398 /* Convert entry to a dma_addr_t */
399 dma_addr = iommu->page_table_map_base +
400 (entry << IO_PAGE_SHIFT);
401 dma_addr |= (s->offset & ~IO_PAGE_MASK);
402
403 /* Insert into HW table */
404 paddr &= IO_PAGE_MASK;
405 while (npages--) {
406 err = iommu_batch_add(paddr);
407 if (unlikely(err < 0L))
408 goto iommu_map_failed;
409 paddr += IO_PAGE_SIZE;
410 }
411
412 /* If we are in an open segment, try merging */
413 if (segstart != s) {
414 /* We cannot merge if:
415 * - allocated dma_addr isn't contiguous to previous allocation
416 */
417 if ((dma_addr != dma_next) ||
418 (outs->dma_length + s->length > max_seg_size) ||
419 (is_span_boundary(out_entry, base_shift,
420 seg_boundary_size, outs, s))) {
421 /* Can't merge: create a new segment */
422 segstart = s;
423 outcount++;
424 outs = sg_next(outs);
425 } else {
426 outs->dma_length += s->length;
427 }
428 }
429
430 if (segstart == s) {
431 /* This is a new segment, fill entries */
432 outs->dma_address = dma_addr;
433 outs->dma_length = slen;
434 out_entry = entry;
435 }
436
437 /* Calculate next page pointer for contiguous check */
438 dma_next = dma_addr + slen;
439 }
440
441 err = iommu_batch_end();
442
443 if (unlikely(err < 0L))
444 goto iommu_map_failed;
445
446 spin_unlock_irqrestore(&iommu->lock, flags);
447
448 if (outcount < incount) {
449 outs = sg_next(outs);
450 outs->dma_address = DMA_ERROR_CODE;
451 outs->dma_length = 0;
452 }
453
454 return outcount;
455
456 iommu_map_failed:
457 for_each_sg(sglist, s, nelems, i) {
458 if (s->dma_length != 0) {
459 unsigned long vaddr, npages;
460
461 vaddr = s->dma_address & IO_PAGE_MASK;
462 npages = iommu_num_pages(s->dma_address, s->dma_length);
463 iommu_range_free(iommu, vaddr, npages);
464 /* XXX demap? XXX */
465 s->dma_address = DMA_ERROR_CODE;
466 s->dma_length = 0;
467 }
468 if (s == outs)
469 break;
470 }
471 spin_unlock_irqrestore(&iommu->lock, flags);
472
473 return 0;
474 }
475
476 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
477 int nelems, enum dma_data_direction direction)
478 {
479 struct pci_pbm_info *pbm;
480 struct scatterlist *sg;
481 struct iommu *iommu;
482 unsigned long flags;
483 u32 devhandle;
484
485 BUG_ON(direction == DMA_NONE);
486
487 iommu = dev->archdata.iommu;
488 pbm = dev->archdata.host_controller;
489 devhandle = pbm->devhandle;
490
491 spin_lock_irqsave(&iommu->lock, flags);
492
493 sg = sglist;
494 while (nelems--) {
495 dma_addr_t dma_handle = sg->dma_address;
496 unsigned int len = sg->dma_length;
497 unsigned long npages, entry;
498
499 if (!len)
500 break;
501 npages = iommu_num_pages(dma_handle, len);
502 iommu_range_free(iommu, dma_handle, npages);
503
504 entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
505 while (npages) {
506 unsigned long num;
507
508 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
509 npages);
510 entry += num;
511 npages -= num;
512 }
513
514 sg = sg_next(sg);
515 }
516
517 spin_unlock_irqrestore(&iommu->lock, flags);
518 }
519
520 static void dma_4v_sync_single_for_cpu(struct device *dev,
521 dma_addr_t bus_addr, size_t sz,
522 enum dma_data_direction direction)
523 {
524 /* Nothing to do... */
525 }
526
527 static void dma_4v_sync_sg_for_cpu(struct device *dev,
528 struct scatterlist *sglist, int nelems,
529 enum dma_data_direction direction)
530 {
531 /* Nothing to do... */
532 }
533
534 static const struct dma_ops sun4v_dma_ops = {
535 .alloc_coherent = dma_4v_alloc_coherent,
536 .free_coherent = dma_4v_free_coherent,
537 .map_single = dma_4v_map_single,
538 .unmap_single = dma_4v_unmap_single,
539 .map_sg = dma_4v_map_sg,
540 .unmap_sg = dma_4v_unmap_sg,
541 .sync_single_for_cpu = dma_4v_sync_single_for_cpu,
542 .sync_sg_for_cpu = dma_4v_sync_sg_for_cpu,
543 };
544
545 static void __init pci_sun4v_scan_bus(struct pci_pbm_info *pbm)
546 {
547 struct property *prop;
548 struct device_node *dp;
549
550 dp = pbm->prom_node;
551 prop = of_find_property(dp, "66mhz-capable", NULL);
552 pbm->is_66mhz_capable = (prop != NULL);
553 pbm->pci_bus = pci_scan_one_pbm(pbm);
554
555 /* XXX register error interrupt handlers XXX */
556 }
557
558 static unsigned long __init probe_existing_entries(struct pci_pbm_info *pbm,
559 struct iommu *iommu)
560 {
561 struct iommu_arena *arena = &iommu->arena;
562 unsigned long i, cnt = 0;
563 u32 devhandle;
564
565 devhandle = pbm->devhandle;
566 for (i = 0; i < arena->limit; i++) {
567 unsigned long ret, io_attrs, ra;
568
569 ret = pci_sun4v_iommu_getmap(devhandle,
570 HV_PCI_TSBID(0, i),
571 &io_attrs, &ra);
572 if (ret == HV_EOK) {
573 if (page_in_phys_avail(ra)) {
574 pci_sun4v_iommu_demap(devhandle,
575 HV_PCI_TSBID(0, i), 1);
576 } else {
577 cnt++;
578 __set_bit(i, arena->map);
579 }
580 }
581 }
582
583 return cnt;
584 }
585
586 static void __init pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
587 {
588 struct iommu *iommu = pbm->iommu;
589 struct property *prop;
590 unsigned long num_tsb_entries, sz, tsbsize;
591 u32 vdma[2], dma_mask, dma_offset;
592
593 prop = of_find_property(pbm->prom_node, "virtual-dma", NULL);
594 if (prop) {
595 u32 *val = prop->value;
596
597 vdma[0] = val[0];
598 vdma[1] = val[1];
599 } else {
600 /* No property, use default values. */
601 vdma[0] = 0x80000000;
602 vdma[1] = 0x80000000;
603 }
604
605 if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
606 prom_printf("PCI-SUN4V: strange virtual-dma[%08x:%08x].\n",
607 vdma[0], vdma[1]);
608 prom_halt();
609 };
610
611 dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
612 num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
613 tsbsize = num_tsb_entries * sizeof(iopte_t);
614
615 dma_offset = vdma[0];
616
617 /* Setup initial software IOMMU state. */
618 spin_lock_init(&iommu->lock);
619 iommu->ctx_lowest_free = 1;
620 iommu->page_table_map_base = dma_offset;
621 iommu->dma_addr_mask = dma_mask;
622
623 /* Allocate and initialize the free area map. */
624 sz = (num_tsb_entries + 7) / 8;
625 sz = (sz + 7UL) & ~7UL;
626 iommu->arena.map = kzalloc(sz, GFP_KERNEL);
627 if (!iommu->arena.map) {
628 prom_printf("PCI_IOMMU: Error, kmalloc(arena.map) failed.\n");
629 prom_halt();
630 }
631 iommu->arena.limit = num_tsb_entries;
632
633 sz = probe_existing_entries(pbm, iommu);
634 if (sz)
635 printk("%s: Imported %lu TSB entries from OBP\n",
636 pbm->name, sz);
637 }
638
639 #ifdef CONFIG_PCI_MSI
640 struct pci_sun4v_msiq_entry {
641 u64 version_type;
642 #define MSIQ_VERSION_MASK 0xffffffff00000000UL
643 #define MSIQ_VERSION_SHIFT 32
644 #define MSIQ_TYPE_MASK 0x00000000000000ffUL
645 #define MSIQ_TYPE_SHIFT 0
646 #define MSIQ_TYPE_NONE 0x00
647 #define MSIQ_TYPE_MSG 0x01
648 #define MSIQ_TYPE_MSI32 0x02
649 #define MSIQ_TYPE_MSI64 0x03
650 #define MSIQ_TYPE_INTX 0x08
651 #define MSIQ_TYPE_NONE2 0xff
652
653 u64 intx_sysino;
654 u64 reserved1;
655 u64 stick;
656 u64 req_id; /* bus/device/func */
657 #define MSIQ_REQID_BUS_MASK 0xff00UL
658 #define MSIQ_REQID_BUS_SHIFT 8
659 #define MSIQ_REQID_DEVICE_MASK 0x00f8UL
660 #define MSIQ_REQID_DEVICE_SHIFT 3
661 #define MSIQ_REQID_FUNC_MASK 0x0007UL
662 #define MSIQ_REQID_FUNC_SHIFT 0
663
664 u64 msi_address;
665
666 /* The format of this value is message type dependent.
667 * For MSI bits 15:0 are the data from the MSI packet.
668 * For MSI-X bits 31:0 are the data from the MSI packet.
669 * For MSG, the message code and message routing code where:
670 * bits 39:32 is the bus/device/fn of the msg target-id
671 * bits 18:16 is the message routing code
672 * bits 7:0 is the message code
673 * For INTx the low order 2-bits are:
674 * 00 - INTA
675 * 01 - INTB
676 * 10 - INTC
677 * 11 - INTD
678 */
679 u64 msi_data;
680
681 u64 reserved2;
682 };
683
684 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
685 unsigned long *head)
686 {
687 unsigned long err, limit;
688
689 err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head);
690 if (unlikely(err))
691 return -ENXIO;
692
693 limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
694 if (unlikely(*head >= limit))
695 return -EFBIG;
696
697 return 0;
698 }
699
700 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm,
701 unsigned long msiqid, unsigned long *head,
702 unsigned long *msi)
703 {
704 struct pci_sun4v_msiq_entry *ep;
705 unsigned long err, type;
706
707 /* Note: void pointer arithmetic, 'head' is a byte offset */
708 ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) *
709 (pbm->msiq_ent_count *
710 sizeof(struct pci_sun4v_msiq_entry))) +
711 *head);
712
713 if ((ep->version_type & MSIQ_TYPE_MASK) == 0)
714 return 0;
715
716 type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT;
717 if (unlikely(type != MSIQ_TYPE_MSI32 &&
718 type != MSIQ_TYPE_MSI64))
719 return -EINVAL;
720
721 *msi = ep->msi_data;
722
723 err = pci_sun4v_msi_setstate(pbm->devhandle,
724 ep->msi_data /* msi_num */,
725 HV_MSISTATE_IDLE);
726 if (unlikely(err))
727 return -ENXIO;
728
729 /* Clear the entry. */
730 ep->version_type &= ~MSIQ_TYPE_MASK;
731
732 (*head) += sizeof(struct pci_sun4v_msiq_entry);
733 if (*head >=
734 (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry)))
735 *head = 0;
736
737 return 1;
738 }
739
740 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
741 unsigned long head)
742 {
743 unsigned long err;
744
745 err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head);
746 if (unlikely(err))
747 return -EINVAL;
748
749 return 0;
750 }
751
752 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
753 unsigned long msi, int is_msi64)
754 {
755 if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid,
756 (is_msi64 ?
757 HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32)))
758 return -ENXIO;
759 if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE))
760 return -ENXIO;
761 if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID))
762 return -ENXIO;
763 return 0;
764 }
765
766 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
767 {
768 unsigned long err, msiqid;
769
770 err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid);
771 if (err)
772 return -ENXIO;
773
774 pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID);
775
776 return 0;
777 }
778
779 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm)
780 {
781 unsigned long q_size, alloc_size, pages, order;
782 int i;
783
784 q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
785 alloc_size = (pbm->msiq_num * q_size);
786 order = get_order(alloc_size);
787 pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
788 if (pages == 0UL) {
789 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
790 order);
791 return -ENOMEM;
792 }
793 memset((char *)pages, 0, PAGE_SIZE << order);
794 pbm->msi_queues = (void *) pages;
795
796 for (i = 0; i < pbm->msiq_num; i++) {
797 unsigned long err, base = __pa(pages + (i * q_size));
798 unsigned long ret1, ret2;
799
800 err = pci_sun4v_msiq_conf(pbm->devhandle,
801 pbm->msiq_first + i,
802 base, pbm->msiq_ent_count);
803 if (err) {
804 printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n",
805 err);
806 goto h_error;
807 }
808
809 err = pci_sun4v_msiq_info(pbm->devhandle,
810 pbm->msiq_first + i,
811 &ret1, &ret2);
812 if (err) {
813 printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n",
814 err);
815 goto h_error;
816 }
817 if (ret1 != base || ret2 != pbm->msiq_ent_count) {
818 printk(KERN_ERR "MSI: Bogus qconf "
819 "expected[%lx:%x] got[%lx:%lx]\n",
820 base, pbm->msiq_ent_count,
821 ret1, ret2);
822 goto h_error;
823 }
824 }
825
826 return 0;
827
828 h_error:
829 free_pages(pages, order);
830 return -EINVAL;
831 }
832
833 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm)
834 {
835 unsigned long q_size, alloc_size, pages, order;
836 int i;
837
838 for (i = 0; i < pbm->msiq_num; i++) {
839 unsigned long msiqid = pbm->msiq_first + i;
840
841 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0);
842 }
843
844 q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
845 alloc_size = (pbm->msiq_num * q_size);
846 order = get_order(alloc_size);
847
848 pages = (unsigned long) pbm->msi_queues;
849
850 free_pages(pages, order);
851
852 pbm->msi_queues = NULL;
853 }
854
855 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm,
856 unsigned long msiqid,
857 unsigned long devino)
858 {
859 unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino);
860
861 if (!virt_irq)
862 return -ENOMEM;
863
864 if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE))
865 return -EINVAL;
866 if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID))
867 return -EINVAL;
868
869 return virt_irq;
870 }
871
872 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = {
873 .get_head = pci_sun4v_get_head,
874 .dequeue_msi = pci_sun4v_dequeue_msi,
875 .set_head = pci_sun4v_set_head,
876 .msi_setup = pci_sun4v_msi_setup,
877 .msi_teardown = pci_sun4v_msi_teardown,
878 .msiq_alloc = pci_sun4v_msiq_alloc,
879 .msiq_free = pci_sun4v_msiq_free,
880 .msiq_build_irq = pci_sun4v_msiq_build_irq,
881 };
882
883 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
884 {
885 sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops);
886 }
887 #else /* CONFIG_PCI_MSI */
888 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
889 {
890 }
891 #endif /* !(CONFIG_PCI_MSI) */
892
893 static void __init pci_sun4v_pbm_init(struct pci_controller_info *p,
894 struct device_node *dp, u32 devhandle)
895 {
896 struct pci_pbm_info *pbm;
897
898 if (devhandle & 0x40)
899 pbm = &p->pbm_B;
900 else
901 pbm = &p->pbm_A;
902
903 pbm->next = pci_pbm_root;
904 pci_pbm_root = pbm;
905
906 pbm->numa_node = of_node_to_nid(dp);
907
908 pbm->scan_bus = pci_sun4v_scan_bus;
909 pbm->pci_ops = &sun4v_pci_ops;
910 pbm->config_space_reg_bits = 12;
911
912 pbm->index = pci_num_pbms++;
913
914 pbm->parent = p;
915 pbm->prom_node = dp;
916
917 pbm->devhandle = devhandle;
918
919 pbm->name = dp->full_name;
920
921 printk("%s: SUN4V PCI Bus Module\n", pbm->name);
922 printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node);
923
924 pci_determine_mem_io_space(pbm);
925
926 pci_get_pbm_props(pbm);
927 pci_sun4v_iommu_init(pbm);
928 pci_sun4v_msi_init(pbm);
929 }
930
931 void __init sun4v_pci_init(struct device_node *dp, char *model_name)
932 {
933 static int hvapi_negotiated = 0;
934 struct pci_controller_info *p;
935 struct pci_pbm_info *pbm;
936 struct iommu *iommu;
937 struct property *prop;
938 struct linux_prom64_registers *regs;
939 u32 devhandle;
940 int i;
941
942 if (!hvapi_negotiated++) {
943 int err = sun4v_hvapi_register(HV_GRP_PCI,
944 vpci_major,
945 &vpci_minor);
946
947 if (err) {
948 prom_printf("SUN4V_PCI: Could not register hvapi, "
949 "err=%d\n", err);
950 prom_halt();
951 }
952 printk("SUN4V_PCI: Registered hvapi major[%lu] minor[%lu]\n",
953 vpci_major, vpci_minor);
954
955 dma_ops = &sun4v_dma_ops;
956 }
957
958 prop = of_find_property(dp, "reg", NULL);
959 if (!prop) {
960 prom_printf("SUN4V_PCI: Could not find config registers\n");
961 prom_halt();
962 }
963 regs = prop->value;
964
965 devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
966
967 for (pbm = pci_pbm_root; pbm; pbm = pbm->next) {
968 if (pbm->devhandle == (devhandle ^ 0x40)) {
969 pci_sun4v_pbm_init(pbm->parent, dp, devhandle);
970 return;
971 }
972 }
973
974 for_each_possible_cpu(i) {
975 unsigned long page = get_zeroed_page(GFP_ATOMIC);
976
977 if (!page)
978 goto fatal_memory_error;
979
980 per_cpu(iommu_batch, i).pglist = (u64 *) page;
981 }
982
983 p = kzalloc(sizeof(struct pci_controller_info), GFP_ATOMIC);
984 if (!p)
985 goto fatal_memory_error;
986
987 iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
988 if (!iommu)
989 goto fatal_memory_error;
990
991 p->pbm_A.iommu = iommu;
992
993 iommu = kzalloc(sizeof(struct iommu), GFP_ATOMIC);
994 if (!iommu)
995 goto fatal_memory_error;
996
997 p->pbm_B.iommu = iommu;
998
999 pci_sun4v_pbm_init(p, dp, devhandle);
1000 return;
1001
1002 fatal_memory_error:
1003 prom_printf("SUN4V_PCI: Fatal memory allocation error.\n");
1004 prom_halt();
1005 }
Linux kernel - Deliverables
This page took 0.075086 seconds and 6 git commands to generate.