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sparc64: prepare module_64.c for unification
[deliverable/linux.git] / arch / sparc / 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 #include <linux/of_device.h>
17
18 #include <asm/iommu.h>
19 #include <asm/irq.h>
20 #include <asm/hypervisor.h>
21 #include <asm/prom.h>
22
23 #include "pci_impl.h"
24 #include "iommu_common.h"
25
26 #include "pci_sun4v.h"
27
28 #define DRIVER_NAME "pci_sun4v"
29 #define PFX DRIVER_NAME ": "
30
31 static unsigned long vpci_major = 1;
32 static unsigned long vpci_minor = 1;
33
34 #define PGLIST_NENTS (PAGE_SIZE / sizeof(u64))
35
36 struct iommu_batch {
37 struct device *dev; /* Device mapping is for. */
38 unsigned long prot; /* IOMMU page protections */
39 unsigned long entry; /* Index into IOTSB. */
40 u64 *pglist; /* List of physical pages */
41 unsigned long npages; /* Number of pages in list. */
42 };
43
44 static DEFINE_PER_CPU(struct iommu_batch, iommu_batch);
45 static int iommu_batch_initialized;
46
47 /* Interrupts must be disabled. */
48 static inline void iommu_batch_start(struct device *dev, unsigned long prot, unsigned long entry)
49 {
50 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
51
52 p->dev = dev;
53 p->prot = prot;
54 p->entry = entry;
55 p->npages = 0;
56 }
57
58 /* Interrupts must be disabled. */
59 static long iommu_batch_flush(struct iommu_batch *p)
60 {
61 struct pci_pbm_info *pbm = p->dev->archdata.host_controller;
62 unsigned long devhandle = pbm->devhandle;
63 unsigned long prot = p->prot;
64 unsigned long entry = p->entry;
65 u64 *pglist = p->pglist;
66 unsigned long npages = p->npages;
67
68 while (npages != 0) {
69 long num;
70
71 num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry),
72 npages, prot, __pa(pglist));
73 if (unlikely(num < 0)) {
74 if (printk_ratelimit())
75 printk("iommu_batch_flush: IOMMU map of "
76 "[%08lx:%08lx:%lx:%lx:%lx] failed with "
77 "status %ld\n",
78 devhandle, HV_PCI_TSBID(0, entry),
79 npages, prot, __pa(pglist), num);
80 return -1;
81 }
82
83 entry += num;
84 npages -= num;
85 pglist += num;
86 }
87
88 p->entry = entry;
89 p->npages = 0;
90
91 return 0;
92 }
93
94 static inline void iommu_batch_new_entry(unsigned long entry)
95 {
96 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
97
98 if (p->entry + p->npages == entry)
99 return;
100 if (p->entry != ~0UL)
101 iommu_batch_flush(p);
102 p->entry = entry;
103 }
104
105 /* Interrupts must be disabled. */
106 static inline long iommu_batch_add(u64 phys_page)
107 {
108 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
109
110 BUG_ON(p->npages >= PGLIST_NENTS);
111
112 p->pglist[p->npages++] = phys_page;
113 if (p->npages == PGLIST_NENTS)
114 return iommu_batch_flush(p);
115
116 return 0;
117 }
118
119 /* Interrupts must be disabled. */
120 static inline long iommu_batch_end(void)
121 {
122 struct iommu_batch *p = &__get_cpu_var(iommu_batch);
123
124 BUG_ON(p->npages >= PGLIST_NENTS);
125
126 return iommu_batch_flush(p);
127 }
128
129 static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
130 dma_addr_t *dma_addrp, gfp_t gfp)
131 {
132 unsigned long flags, order, first_page, npages, n;
133 struct iommu *iommu;
134 struct page *page;
135 void *ret;
136 long entry;
137 int nid;
138
139 size = IO_PAGE_ALIGN(size);
140 order = get_order(size);
141 if (unlikely(order >= MAX_ORDER))
142 return NULL;
143
144 npages = size >> IO_PAGE_SHIFT;
145
146 nid = dev->archdata.numa_node;
147 page = alloc_pages_node(nid, gfp, order);
148 if (unlikely(!page))
149 return NULL;
150
151 first_page = (unsigned long) page_address(page);
152 memset((char *)first_page, 0, PAGE_SIZE << order);
153
154 iommu = dev->archdata.iommu;
155
156 spin_lock_irqsave(&iommu->lock, flags);
157 entry = iommu_range_alloc(dev, iommu, npages, NULL);
158 spin_unlock_irqrestore(&iommu->lock, flags);
159
160 if (unlikely(entry == DMA_ERROR_CODE))
161 goto range_alloc_fail;
162
163 *dma_addrp = (iommu->page_table_map_base +
164 (entry << IO_PAGE_SHIFT));
165 ret = (void *) first_page;
166 first_page = __pa(first_page);
167
168 local_irq_save(flags);
169
170 iommu_batch_start(dev,
171 (HV_PCI_MAP_ATTR_READ |
172 HV_PCI_MAP_ATTR_WRITE),
173 entry);
174
175 for (n = 0; n < npages; n++) {
176 long err = iommu_batch_add(first_page + (n * PAGE_SIZE));
177 if (unlikely(err < 0L))
178 goto iommu_map_fail;
179 }
180
181 if (unlikely(iommu_batch_end() < 0L))
182 goto iommu_map_fail;
183
184 local_irq_restore(flags);
185
186 return ret;
187
188 iommu_map_fail:
189 /* Interrupts are disabled. */
190 spin_lock(&iommu->lock);
191 iommu_range_free(iommu, *dma_addrp, npages);
192 spin_unlock_irqrestore(&iommu->lock, flags);
193
194 range_alloc_fail:
195 free_pages(first_page, order);
196 return NULL;
197 }
198
199 static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
200 dma_addr_t dvma)
201 {
202 struct pci_pbm_info *pbm;
203 struct iommu *iommu;
204 unsigned long flags, order, npages, entry;
205 u32 devhandle;
206
207 npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
208 iommu = dev->archdata.iommu;
209 pbm = dev->archdata.host_controller;
210 devhandle = pbm->devhandle;
211 entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
212
213 spin_lock_irqsave(&iommu->lock, flags);
214
215 iommu_range_free(iommu, dvma, npages);
216
217 do {
218 unsigned long num;
219
220 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
221 npages);
222 entry += num;
223 npages -= num;
224 } while (npages != 0);
225
226 spin_unlock_irqrestore(&iommu->lock, flags);
227
228 order = get_order(size);
229 if (order < 10)
230 free_pages((unsigned long)cpu, order);
231 }
232
233 static dma_addr_t dma_4v_map_single(struct device *dev, void *ptr, size_t sz,
234 enum dma_data_direction direction)
235 {
236 struct iommu *iommu;
237 unsigned long flags, npages, oaddr;
238 unsigned long i, base_paddr;
239 u32 bus_addr, ret;
240 unsigned long prot;
241 long entry;
242
243 iommu = dev->archdata.iommu;
244
245 if (unlikely(direction == DMA_NONE))
246 goto bad;
247
248 oaddr = (unsigned long)ptr;
249 npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
250 npages >>= IO_PAGE_SHIFT;
251
252 spin_lock_irqsave(&iommu->lock, flags);
253 entry = iommu_range_alloc(dev, iommu, npages, NULL);
254 spin_unlock_irqrestore(&iommu->lock, flags);
255
256 if (unlikely(entry == DMA_ERROR_CODE))
257 goto bad;
258
259 bus_addr = (iommu->page_table_map_base +
260 (entry << IO_PAGE_SHIFT));
261 ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
262 base_paddr = __pa(oaddr & IO_PAGE_MASK);
263 prot = HV_PCI_MAP_ATTR_READ;
264 if (direction != DMA_TO_DEVICE)
265 prot |= HV_PCI_MAP_ATTR_WRITE;
266
267 local_irq_save(flags);
268
269 iommu_batch_start(dev, prot, entry);
270
271 for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) {
272 long err = iommu_batch_add(base_paddr);
273 if (unlikely(err < 0L))
274 goto iommu_map_fail;
275 }
276 if (unlikely(iommu_batch_end() < 0L))
277 goto iommu_map_fail;
278
279 local_irq_restore(flags);
280
281 return ret;
282
283 bad:
284 if (printk_ratelimit())
285 WARN_ON(1);
286 return DMA_ERROR_CODE;
287
288 iommu_map_fail:
289 /* Interrupts are disabled. */
290 spin_lock(&iommu->lock);
291 iommu_range_free(iommu, bus_addr, npages);
292 spin_unlock_irqrestore(&iommu->lock, flags);
293
294 return DMA_ERROR_CODE;
295 }
296
297 static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
298 size_t sz, enum dma_data_direction direction)
299 {
300 struct pci_pbm_info *pbm;
301 struct iommu *iommu;
302 unsigned long flags, npages;
303 long entry;
304 u32 devhandle;
305
306 if (unlikely(direction == DMA_NONE)) {
307 if (printk_ratelimit())
308 WARN_ON(1);
309 return;
310 }
311
312 iommu = dev->archdata.iommu;
313 pbm = dev->archdata.host_controller;
314 devhandle = pbm->devhandle;
315
316 npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
317 npages >>= IO_PAGE_SHIFT;
318 bus_addr &= IO_PAGE_MASK;
319
320 spin_lock_irqsave(&iommu->lock, flags);
321
322 iommu_range_free(iommu, bus_addr, npages);
323
324 entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
325 do {
326 unsigned long num;
327
328 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
329 npages);
330 entry += num;
331 npages -= num;
332 } while (npages != 0);
333
334 spin_unlock_irqrestore(&iommu->lock, flags);
335 }
336
337 static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
338 int nelems, enum dma_data_direction direction)
339 {
340 struct scatterlist *s, *outs, *segstart;
341 unsigned long flags, handle, prot;
342 dma_addr_t dma_next = 0, dma_addr;
343 unsigned int max_seg_size;
344 unsigned long seg_boundary_size;
345 int outcount, incount, i;
346 struct iommu *iommu;
347 unsigned long base_shift;
348 long err;
349
350 BUG_ON(direction == DMA_NONE);
351
352 iommu = dev->archdata.iommu;
353 if (nelems == 0 || !iommu)
354 return 0;
355
356 prot = HV_PCI_MAP_ATTR_READ;
357 if (direction != DMA_TO_DEVICE)
358 prot |= HV_PCI_MAP_ATTR_WRITE;
359
360 outs = s = segstart = &sglist[0];
361 outcount = 1;
362 incount = nelems;
363 handle = 0;
364
365 /* Init first segment length for backout at failure */
366 outs->dma_length = 0;
367
368 spin_lock_irqsave(&iommu->lock, flags);
369
370 iommu_batch_start(dev, prot, ~0UL);
371
372 max_seg_size = dma_get_max_seg_size(dev);
373 seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
374 IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
375 base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
376 for_each_sg(sglist, s, nelems, i) {
377 unsigned long paddr, npages, entry, out_entry = 0, slen;
378
379 slen = s->length;
380 /* Sanity check */
381 if (slen == 0) {
382 dma_next = 0;
383 continue;
384 }
385 /* Allocate iommu entries for that segment */
386 paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
387 npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE);
388 entry = iommu_range_alloc(dev, iommu, npages, &handle);
389
390 /* Handle failure */
391 if (unlikely(entry == DMA_ERROR_CODE)) {
392 if (printk_ratelimit())
393 printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
394 " npages %lx\n", iommu, paddr, npages);
395 goto iommu_map_failed;
396 }
397
398 iommu_batch_new_entry(entry);
399
400 /* Convert entry to a dma_addr_t */
401 dma_addr = iommu->page_table_map_base +
402 (entry << IO_PAGE_SHIFT);
403 dma_addr |= (s->offset & ~IO_PAGE_MASK);
404
405 /* Insert into HW table */
406 paddr &= IO_PAGE_MASK;
407 while (npages--) {
408 err = iommu_batch_add(paddr);
409 if (unlikely(err < 0L))
410 goto iommu_map_failed;
411 paddr += IO_PAGE_SIZE;
412 }
413
414 /* If we are in an open segment, try merging */
415 if (segstart != s) {
416 /* We cannot merge if:
417 * - allocated dma_addr isn't contiguous to previous allocation
418 */
419 if ((dma_addr != dma_next) ||
420 (outs->dma_length + s->length > max_seg_size) ||
421 (is_span_boundary(out_entry, base_shift,
422 seg_boundary_size, outs, s))) {
423 /* Can't merge: create a new segment */
424 segstart = s;
425 outcount++;
426 outs = sg_next(outs);
427 } else {
428 outs->dma_length += s->length;
429 }
430 }
431
432 if (segstart == s) {
433 /* This is a new segment, fill entries */
434 outs->dma_address = dma_addr;
435 outs->dma_length = slen;
436 out_entry = entry;
437 }
438
439 /* Calculate next page pointer for contiguous check */
440 dma_next = dma_addr + slen;
441 }
442
443 err = iommu_batch_end();
444
445 if (unlikely(err < 0L))
446 goto iommu_map_failed;
447
448 spin_unlock_irqrestore(&iommu->lock, flags);
449
450 if (outcount < incount) {
451 outs = sg_next(outs);
452 outs->dma_address = DMA_ERROR_CODE;
453 outs->dma_length = 0;
454 }
455
456 return outcount;
457
458 iommu_map_failed:
459 for_each_sg(sglist, s, nelems, i) {
460 if (s->dma_length != 0) {
461 unsigned long vaddr, npages;
462
463 vaddr = s->dma_address & IO_PAGE_MASK;
464 npages = iommu_num_pages(s->dma_address, s->dma_length,
465 IO_PAGE_SIZE);
466 iommu_range_free(iommu, vaddr, npages);
467 /* XXX demap? XXX */
468 s->dma_address = DMA_ERROR_CODE;
469 s->dma_length = 0;
470 }
471 if (s == outs)
472 break;
473 }
474 spin_unlock_irqrestore(&iommu->lock, flags);
475
476 return 0;
477 }
478
479 static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
480 int nelems, enum dma_data_direction direction)
481 {
482 struct pci_pbm_info *pbm;
483 struct scatterlist *sg;
484 struct iommu *iommu;
485 unsigned long flags;
486 u32 devhandle;
487
488 BUG_ON(direction == DMA_NONE);
489
490 iommu = dev->archdata.iommu;
491 pbm = dev->archdata.host_controller;
492 devhandle = pbm->devhandle;
493
494 spin_lock_irqsave(&iommu->lock, flags);
495
496 sg = sglist;
497 while (nelems--) {
498 dma_addr_t dma_handle = sg->dma_address;
499 unsigned int len = sg->dma_length;
500 unsigned long npages, entry;
501
502 if (!len)
503 break;
504 npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE);
505 iommu_range_free(iommu, dma_handle, npages);
506
507 entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
508 while (npages) {
509 unsigned long num;
510
511 num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
512 npages);
513 entry += num;
514 npages -= num;
515 }
516
517 sg = sg_next(sg);
518 }
519
520 spin_unlock_irqrestore(&iommu->lock, flags);
521 }
522
523 static void dma_4v_sync_single_for_cpu(struct device *dev,
524 dma_addr_t bus_addr, size_t sz,
525 enum dma_data_direction direction)
526 {
527 /* Nothing to do... */
528 }
529
530 static void dma_4v_sync_sg_for_cpu(struct device *dev,
531 struct scatterlist *sglist, int nelems,
532 enum dma_data_direction direction)
533 {
534 /* Nothing to do... */
535 }
536
537 static const struct dma_ops sun4v_dma_ops = {
538 .alloc_coherent = dma_4v_alloc_coherent,
539 .free_coherent = dma_4v_free_coherent,
540 .map_single = dma_4v_map_single,
541 .unmap_single = dma_4v_unmap_single,
542 .map_sg = dma_4v_map_sg,
543 .unmap_sg = dma_4v_unmap_sg,
544 .sync_single_for_cpu = dma_4v_sync_single_for_cpu,
545 .sync_sg_for_cpu = dma_4v_sync_sg_for_cpu,
546 };
547
548 static void __init pci_sun4v_scan_bus(struct pci_pbm_info *pbm,
549 struct device *parent)
550 {
551 struct property *prop;
552 struct device_node *dp;
553
554 dp = pbm->op->node;
555 prop = of_find_property(dp, "66mhz-capable", NULL);
556 pbm->is_66mhz_capable = (prop != NULL);
557 pbm->pci_bus = pci_scan_one_pbm(pbm, parent);
558
559 /* XXX register error interrupt handlers XXX */
560 }
561
562 static unsigned long __init probe_existing_entries(struct pci_pbm_info *pbm,
563 struct iommu *iommu)
564 {
565 struct iommu_arena *arena = &iommu->arena;
566 unsigned long i, cnt = 0;
567 u32 devhandle;
568
569 devhandle = pbm->devhandle;
570 for (i = 0; i < arena->limit; i++) {
571 unsigned long ret, io_attrs, ra;
572
573 ret = pci_sun4v_iommu_getmap(devhandle,
574 HV_PCI_TSBID(0, i),
575 &io_attrs, &ra);
576 if (ret == HV_EOK) {
577 if (page_in_phys_avail(ra)) {
578 pci_sun4v_iommu_demap(devhandle,
579 HV_PCI_TSBID(0, i), 1);
580 } else {
581 cnt++;
582 __set_bit(i, arena->map);
583 }
584 }
585 }
586
587 return cnt;
588 }
589
590 static int __init pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
591 {
592 static const u32 vdma_default[] = { 0x80000000, 0x80000000 };
593 struct iommu *iommu = pbm->iommu;
594 unsigned long num_tsb_entries, sz, tsbsize;
595 u32 dma_mask, dma_offset;
596 const u32 *vdma;
597
598 vdma = of_get_property(pbm->op->node, "virtual-dma", NULL);
599 if (!vdma)
600 vdma = vdma_default;
601
602 if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
603 printk(KERN_ERR PFX "Strange virtual-dma[%08x:%08x].\n",
604 vdma[0], vdma[1]);
605 return -EINVAL;
606 };
607
608 dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
609 num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
610 tsbsize = num_tsb_entries * sizeof(iopte_t);
611
612 dma_offset = vdma[0];
613
614 /* Setup initial software IOMMU state. */
615 spin_lock_init(&iommu->lock);
616 iommu->ctx_lowest_free = 1;
617 iommu->page_table_map_base = dma_offset;
618 iommu->dma_addr_mask = dma_mask;
619
620 /* Allocate and initialize the free area map. */
621 sz = (num_tsb_entries + 7) / 8;
622 sz = (sz + 7UL) & ~7UL;
623 iommu->arena.map = kzalloc(sz, GFP_KERNEL);
624 if (!iommu->arena.map) {
625 printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n");
626 return -ENOMEM;
627 }
628 iommu->arena.limit = num_tsb_entries;
629
630 sz = probe_existing_entries(pbm, iommu);
631 if (sz)
632 printk("%s: Imported %lu TSB entries from OBP\n",
633 pbm->name, sz);
634
635 return 0;
636 }
637
638 #ifdef CONFIG_PCI_MSI
639 struct pci_sun4v_msiq_entry {
640 u64 version_type;
641 #define MSIQ_VERSION_MASK 0xffffffff00000000UL
642 #define MSIQ_VERSION_SHIFT 32
643 #define MSIQ_TYPE_MASK 0x00000000000000ffUL
644 #define MSIQ_TYPE_SHIFT 0
645 #define MSIQ_TYPE_NONE 0x00
646 #define MSIQ_TYPE_MSG 0x01
647 #define MSIQ_TYPE_MSI32 0x02
648 #define MSIQ_TYPE_MSI64 0x03
649 #define MSIQ_TYPE_INTX 0x08
650 #define MSIQ_TYPE_NONE2 0xff
651
652 u64 intx_sysino;
653 u64 reserved1;
654 u64 stick;
655 u64 req_id; /* bus/device/func */
656 #define MSIQ_REQID_BUS_MASK 0xff00UL
657 #define MSIQ_REQID_BUS_SHIFT 8
658 #define MSIQ_REQID_DEVICE_MASK 0x00f8UL
659 #define MSIQ_REQID_DEVICE_SHIFT 3
660 #define MSIQ_REQID_FUNC_MASK 0x0007UL
661 #define MSIQ_REQID_FUNC_SHIFT 0
662
663 u64 msi_address;
664
665 /* The format of this value is message type dependent.
666 * For MSI bits 15:0 are the data from the MSI packet.
667 * For MSI-X bits 31:0 are the data from the MSI packet.
668 * For MSG, the message code and message routing code where:
669 * bits 39:32 is the bus/device/fn of the msg target-id
670 * bits 18:16 is the message routing code
671 * bits 7:0 is the message code
672 * For INTx the low order 2-bits are:
673 * 00 - INTA
674 * 01 - INTB
675 * 10 - INTC
676 * 11 - INTD
677 */
678 u64 msi_data;
679
680 u64 reserved2;
681 };
682
683 static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
684 unsigned long *head)
685 {
686 unsigned long err, limit;
687
688 err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head);
689 if (unlikely(err))
690 return -ENXIO;
691
692 limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
693 if (unlikely(*head >= limit))
694 return -EFBIG;
695
696 return 0;
697 }
698
699 static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm,
700 unsigned long msiqid, unsigned long *head,
701 unsigned long *msi)
702 {
703 struct pci_sun4v_msiq_entry *ep;
704 unsigned long err, type;
705
706 /* Note: void pointer arithmetic, 'head' is a byte offset */
707 ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) *
708 (pbm->msiq_ent_count *
709 sizeof(struct pci_sun4v_msiq_entry))) +
710 *head);
711
712 if ((ep->version_type & MSIQ_TYPE_MASK) == 0)
713 return 0;
714
715 type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT;
716 if (unlikely(type != MSIQ_TYPE_MSI32 &&
717 type != MSIQ_TYPE_MSI64))
718 return -EINVAL;
719
720 *msi = ep->msi_data;
721
722 err = pci_sun4v_msi_setstate(pbm->devhandle,
723 ep->msi_data /* msi_num */,
724 HV_MSISTATE_IDLE);
725 if (unlikely(err))
726 return -ENXIO;
727
728 /* Clear the entry. */
729 ep->version_type &= ~MSIQ_TYPE_MASK;
730
731 (*head) += sizeof(struct pci_sun4v_msiq_entry);
732 if (*head >=
733 (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry)))
734 *head = 0;
735
736 return 1;
737 }
738
739 static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
740 unsigned long head)
741 {
742 unsigned long err;
743
744 err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head);
745 if (unlikely(err))
746 return -EINVAL;
747
748 return 0;
749 }
750
751 static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
752 unsigned long msi, int is_msi64)
753 {
754 if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid,
755 (is_msi64 ?
756 HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32)))
757 return -ENXIO;
758 if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE))
759 return -ENXIO;
760 if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID))
761 return -ENXIO;
762 return 0;
763 }
764
765 static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
766 {
767 unsigned long err, msiqid;
768
769 err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid);
770 if (err)
771 return -ENXIO;
772
773 pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID);
774
775 return 0;
776 }
777
778 static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm)
779 {
780 unsigned long q_size, alloc_size, pages, order;
781 int i;
782
783 q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
784 alloc_size = (pbm->msiq_num * q_size);
785 order = get_order(alloc_size);
786 pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
787 if (pages == 0UL) {
788 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
789 order);
790 return -ENOMEM;
791 }
792 memset((char *)pages, 0, PAGE_SIZE << order);
793 pbm->msi_queues = (void *) pages;
794
795 for (i = 0; i < pbm->msiq_num; i++) {
796 unsigned long err, base = __pa(pages + (i * q_size));
797 unsigned long ret1, ret2;
798
799 err = pci_sun4v_msiq_conf(pbm->devhandle,
800 pbm->msiq_first + i,
801 base, pbm->msiq_ent_count);
802 if (err) {
803 printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n",
804 err);
805 goto h_error;
806 }
807
808 err = pci_sun4v_msiq_info(pbm->devhandle,
809 pbm->msiq_first + i,
810 &ret1, &ret2);
811 if (err) {
812 printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n",
813 err);
814 goto h_error;
815 }
816 if (ret1 != base || ret2 != pbm->msiq_ent_count) {
817 printk(KERN_ERR "MSI: Bogus qconf "
818 "expected[%lx:%x] got[%lx:%lx]\n",
819 base, pbm->msiq_ent_count,
820 ret1, ret2);
821 goto h_error;
822 }
823 }
824
825 return 0;
826
827 h_error:
828 free_pages(pages, order);
829 return -EINVAL;
830 }
831
832 static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm)
833 {
834 unsigned long q_size, alloc_size, pages, order;
835 int i;
836
837 for (i = 0; i < pbm->msiq_num; i++) {
838 unsigned long msiqid = pbm->msiq_first + i;
839
840 (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0);
841 }
842
843 q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry);
844 alloc_size = (pbm->msiq_num * q_size);
845 order = get_order(alloc_size);
846
847 pages = (unsigned long) pbm->msi_queues;
848
849 free_pages(pages, order);
850
851 pbm->msi_queues = NULL;
852 }
853
854 static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm,
855 unsigned long msiqid,
856 unsigned long devino)
857 {
858 unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino);
859
860 if (!virt_irq)
861 return -ENOMEM;
862
863 if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE))
864 return -EINVAL;
865 if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID))
866 return -EINVAL;
867
868 return virt_irq;
869 }
870
871 static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = {
872 .get_head = pci_sun4v_get_head,
873 .dequeue_msi = pci_sun4v_dequeue_msi,
874 .set_head = pci_sun4v_set_head,
875 .msi_setup = pci_sun4v_msi_setup,
876 .msi_teardown = pci_sun4v_msi_teardown,
877 .msiq_alloc = pci_sun4v_msiq_alloc,
878 .msiq_free = pci_sun4v_msiq_free,
879 .msiq_build_irq = pci_sun4v_msiq_build_irq,
880 };
881
882 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
883 {
884 sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops);
885 }
886 #else /* CONFIG_PCI_MSI */
887 static void pci_sun4v_msi_init(struct pci_pbm_info *pbm)
888 {
889 }
890 #endif /* !(CONFIG_PCI_MSI) */
891
892 static int __init pci_sun4v_pbm_init(struct pci_pbm_info *pbm,
893 struct of_device *op, u32 devhandle)
894 {
895 struct device_node *dp = op->node;
896 int err;
897
898 pbm->numa_node = of_node_to_nid(dp);
899
900 pbm->pci_ops = &sun4v_pci_ops;
901 pbm->config_space_reg_bits = 12;
902
903 pbm->index = pci_num_pbms++;
904
905 pbm->op = op;
906
907 pbm->devhandle = devhandle;
908
909 pbm->name = dp->full_name;
910
911 printk("%s: SUN4V PCI Bus Module\n", pbm->name);
912 printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node);
913
914 pci_determine_mem_io_space(pbm);
915
916 pci_get_pbm_props(pbm);
917
918 err = pci_sun4v_iommu_init(pbm);
919 if (err)
920 return err;
921
922 pci_sun4v_msi_init(pbm);
923
924 pci_sun4v_scan_bus(pbm, &op->dev);
925
926 pbm->next = pci_pbm_root;
927 pci_pbm_root = pbm;
928
929 return 0;
930 }
931
932 static int __devinit pci_sun4v_probe(struct of_device *op,
933 const struct of_device_id *match)
934 {
935 const struct linux_prom64_registers *regs;
936 static int hvapi_negotiated = 0;
937 struct pci_pbm_info *pbm;
938 struct device_node *dp;
939 struct iommu *iommu;
940 u32 devhandle;
941 int i, err;
942
943 dp = op->node;
944
945 if (!hvapi_negotiated++) {
946 err = sun4v_hvapi_register(HV_GRP_PCI,
947 vpci_major,
948 &vpci_minor);
949
950 if (err) {
951 printk(KERN_ERR PFX "Could not register hvapi, "
952 "err=%d\n", err);
953 return err;
954 }
955 printk(KERN_INFO PFX "Registered hvapi major[%lu] minor[%lu]\n",
956 vpci_major, vpci_minor);
957
958 dma_ops = &sun4v_dma_ops;
959 }
960
961 regs = of_get_property(dp, "reg", NULL);
962 err = -ENODEV;
963 if (!regs) {
964 printk(KERN_ERR PFX "Could not find config registers\n");
965 goto out_err;
966 }
967 devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;
968
969 err = -ENOMEM;
970 if (!iommu_batch_initialized) {
971 for_each_possible_cpu(i) {
972 unsigned long page = get_zeroed_page(GFP_KERNEL);
973
974 if (!page)
975 goto out_err;
976
977 per_cpu(iommu_batch, i).pglist = (u64 *) page;
978 }
979 iommu_batch_initialized = 1;
980 }
981
982 pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
983 if (!pbm) {
984 printk(KERN_ERR PFX "Could not allocate pci_pbm_info\n");
985 goto out_err;
986 }
987
988 iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL);
989 if (!iommu) {
990 printk(KERN_ERR PFX "Could not allocate pbm iommu\n");
991 goto out_free_controller;
992 }
993
994 pbm->iommu = iommu;
995
996 err = pci_sun4v_pbm_init(pbm, op, devhandle);
997 if (err)
998 goto out_free_iommu;
999
1000 dev_set_drvdata(&op->dev, pbm);
1001
1002 return 0;
1003
1004 out_free_iommu:
1005 kfree(pbm->iommu);
1006
1007 out_free_controller:
1008 kfree(pbm);
1009
1010 out_err:
1011 return err;
1012 }
1013
1014 static struct of_device_id __initdata pci_sun4v_match[] = {
1015 {
1016 .name = "pci",
1017 .compatible = "SUNW,sun4v-pci",
1018 },
1019 {},
1020 };
1021
1022 static struct of_platform_driver pci_sun4v_driver = {
1023 .name = DRIVER_NAME,
1024 .match_table = pci_sun4v_match,
1025 .probe = pci_sun4v_probe,
1026 };
1027
1028 static int __init pci_sun4v_init(void)
1029 {
1030 return of_register_driver(&pci_sun4v_driver, &of_bus_type);
1031 }
1032
1033 subsys_initcall(pci_sun4v_init);
Linux kernel - Deliverables
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