Loading...
Note: File does not exist in v5.14.15.
1/*
2 * Derived from arch/powerpc/kernel/iommu.c
3 *
4 * Copyright IBM Corporation, 2006-2007
5 * Copyright (C) 2006 Jon Mason <jdmason@kudzu.us>
6 *
7 * Author: Jon Mason <jdmason@kudzu.us>
8 * Author: Muli Ben-Yehuda <muli@il.ibm.com>
9
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25#define pr_fmt(fmt) "Calgary: " fmt
26
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/slab.h>
31#include <linux/mm.h>
32#include <linux/spinlock.h>
33#include <linux/string.h>
34#include <linux/crash_dump.h>
35#include <linux/dma-mapping.h>
36#include <linux/dma-direct.h>
37#include <linux/bitmap.h>
38#include <linux/pci_ids.h>
39#include <linux/pci.h>
40#include <linux/delay.h>
41#include <linux/scatterlist.h>
42#include <linux/iommu-helper.h>
43
44#include <asm/iommu.h>
45#include <asm/calgary.h>
46#include <asm/tce.h>
47#include <asm/pci-direct.h>
48#include <asm/dma.h>
49#include <asm/rio.h>
50#include <asm/bios_ebda.h>
51#include <asm/x86_init.h>
52#include <asm/iommu_table.h>
53
54#define CALGARY_MAPPING_ERROR 0
55
56#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
57int use_calgary __read_mostly = 1;
58#else
59int use_calgary __read_mostly = 0;
60#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
61
62#define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
63#define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
64
65/* register offsets inside the host bridge space */
66#define CALGARY_CONFIG_REG 0x0108
67#define PHB_CSR_OFFSET 0x0110 /* Channel Status */
68#define PHB_PLSSR_OFFSET 0x0120
69#define PHB_CONFIG_RW_OFFSET 0x0160
70#define PHB_IOBASE_BAR_LOW 0x0170
71#define PHB_IOBASE_BAR_HIGH 0x0180
72#define PHB_MEM_1_LOW 0x0190
73#define PHB_MEM_1_HIGH 0x01A0
74#define PHB_IO_ADDR_SIZE 0x01B0
75#define PHB_MEM_1_SIZE 0x01C0
76#define PHB_MEM_ST_OFFSET 0x01D0
77#define PHB_AER_OFFSET 0x0200
78#define PHB_CONFIG_0_HIGH 0x0220
79#define PHB_CONFIG_0_LOW 0x0230
80#define PHB_CONFIG_0_END 0x0240
81#define PHB_MEM_2_LOW 0x02B0
82#define PHB_MEM_2_HIGH 0x02C0
83#define PHB_MEM_2_SIZE_HIGH 0x02D0
84#define PHB_MEM_2_SIZE_LOW 0x02E0
85#define PHB_DOSHOLE_OFFSET 0x08E0
86
87/* CalIOC2 specific */
88#define PHB_SAVIOR_L2 0x0DB0
89#define PHB_PAGE_MIG_CTRL 0x0DA8
90#define PHB_PAGE_MIG_DEBUG 0x0DA0
91#define PHB_ROOT_COMPLEX_STATUS 0x0CB0
92
93/* PHB_CONFIG_RW */
94#define PHB_TCE_ENABLE 0x20000000
95#define PHB_SLOT_DISABLE 0x1C000000
96#define PHB_DAC_DISABLE 0x01000000
97#define PHB_MEM2_ENABLE 0x00400000
98#define PHB_MCSR_ENABLE 0x00100000
99/* TAR (Table Address Register) */
100#define TAR_SW_BITS 0x0000ffffffff800fUL
101#define TAR_VALID 0x0000000000000008UL
102/* CSR (Channel/DMA Status Register) */
103#define CSR_AGENT_MASK 0xffe0ffff
104/* CCR (Calgary Configuration Register) */
105#define CCR_2SEC_TIMEOUT 0x000000000000000EUL
106/* PMCR/PMDR (Page Migration Control/Debug Registers */
107#define PMR_SOFTSTOP 0x80000000
108#define PMR_SOFTSTOPFAULT 0x40000000
109#define PMR_HARDSTOP 0x20000000
110
111/*
112 * The maximum PHB bus number.
113 * x3950M2 (rare): 8 chassis, 48 PHBs per chassis = 384
114 * x3950M2: 4 chassis, 48 PHBs per chassis = 192
115 * x3950 (PCIE): 8 chassis, 32 PHBs per chassis = 256
116 * x3950 (PCIX): 8 chassis, 16 PHBs per chassis = 128
117 */
118#define MAX_PHB_BUS_NUM 256
119
120#define PHBS_PER_CALGARY 4
121
122/* register offsets in Calgary's internal register space */
123static const unsigned long tar_offsets[] = {
124 0x0580 /* TAR0 */,
125 0x0588 /* TAR1 */,
126 0x0590 /* TAR2 */,
127 0x0598 /* TAR3 */
128};
129
130static const unsigned long split_queue_offsets[] = {
131 0x4870 /* SPLIT QUEUE 0 */,
132 0x5870 /* SPLIT QUEUE 1 */,
133 0x6870 /* SPLIT QUEUE 2 */,
134 0x7870 /* SPLIT QUEUE 3 */
135};
136
137static const unsigned long phb_offsets[] = {
138 0x8000 /* PHB0 */,
139 0x9000 /* PHB1 */,
140 0xA000 /* PHB2 */,
141 0xB000 /* PHB3 */
142};
143
144/* PHB debug registers */
145
146static const unsigned long phb_debug_offsets[] = {
147 0x4000 /* PHB 0 DEBUG */,
148 0x5000 /* PHB 1 DEBUG */,
149 0x6000 /* PHB 2 DEBUG */,
150 0x7000 /* PHB 3 DEBUG */
151};
152
153/*
154 * STUFF register for each debug PHB,
155 * byte 1 = start bus number, byte 2 = end bus number
156 */
157
158#define PHB_DEBUG_STUFF_OFFSET 0x0020
159
160#define EMERGENCY_PAGES 32 /* = 128KB */
161
162unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
163static int translate_empty_slots __read_mostly = 0;
164static int calgary_detected __read_mostly = 0;
165
166static struct rio_table_hdr *rio_table_hdr __initdata;
167static struct scal_detail *scal_devs[MAX_NUMNODES] __initdata;
168static struct rio_detail *rio_devs[MAX_NUMNODES * 4] __initdata;
169
170struct calgary_bus_info {
171 void *tce_space;
172 unsigned char translation_disabled;
173 signed char phbid;
174 void __iomem *bbar;
175};
176
177static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
178static void calgary_tce_cache_blast(struct iommu_table *tbl);
179static void calgary_dump_error_regs(struct iommu_table *tbl);
180static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
181static void calioc2_tce_cache_blast(struct iommu_table *tbl);
182static void calioc2_dump_error_regs(struct iommu_table *tbl);
183static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl);
184static void get_tce_space_from_tar(void);
185
186static const struct cal_chipset_ops calgary_chip_ops = {
187 .handle_quirks = calgary_handle_quirks,
188 .tce_cache_blast = calgary_tce_cache_blast,
189 .dump_error_regs = calgary_dump_error_regs
190};
191
192static const struct cal_chipset_ops calioc2_chip_ops = {
193 .handle_quirks = calioc2_handle_quirks,
194 .tce_cache_blast = calioc2_tce_cache_blast,
195 .dump_error_regs = calioc2_dump_error_regs
196};
197
198static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
199
200static inline int translation_enabled(struct iommu_table *tbl)
201{
202 /* only PHBs with translation enabled have an IOMMU table */
203 return (tbl != NULL);
204}
205
206static void iommu_range_reserve(struct iommu_table *tbl,
207 unsigned long start_addr, unsigned int npages)
208{
209 unsigned long index;
210 unsigned long end;
211 unsigned long flags;
212
213 index = start_addr >> PAGE_SHIFT;
214
215 /* bail out if we're asked to reserve a region we don't cover */
216 if (index >= tbl->it_size)
217 return;
218
219 end = index + npages;
220 if (end > tbl->it_size) /* don't go off the table */
221 end = tbl->it_size;
222
223 spin_lock_irqsave(&tbl->it_lock, flags);
224
225 bitmap_set(tbl->it_map, index, npages);
226
227 spin_unlock_irqrestore(&tbl->it_lock, flags);
228}
229
230static unsigned long iommu_range_alloc(struct device *dev,
231 struct iommu_table *tbl,
232 unsigned int npages)
233{
234 unsigned long flags;
235 unsigned long offset;
236 unsigned long boundary_size;
237
238 boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
239 PAGE_SIZE) >> PAGE_SHIFT;
240
241 BUG_ON(npages == 0);
242
243 spin_lock_irqsave(&tbl->it_lock, flags);
244
245 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, tbl->it_hint,
246 npages, 0, boundary_size, 0);
247 if (offset == ~0UL) {
248 tbl->chip_ops->tce_cache_blast(tbl);
249
250 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, 0,
251 npages, 0, boundary_size, 0);
252 if (offset == ~0UL) {
253 pr_warn("IOMMU full\n");
254 spin_unlock_irqrestore(&tbl->it_lock, flags);
255 if (panic_on_overflow)
256 panic("Calgary: fix the allocator.\n");
257 else
258 return CALGARY_MAPPING_ERROR;
259 }
260 }
261
262 tbl->it_hint = offset + npages;
263 BUG_ON(tbl->it_hint > tbl->it_size);
264
265 spin_unlock_irqrestore(&tbl->it_lock, flags);
266
267 return offset;
268}
269
270static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
271 void *vaddr, unsigned int npages, int direction)
272{
273 unsigned long entry;
274 dma_addr_t ret;
275
276 entry = iommu_range_alloc(dev, tbl, npages);
277
278 if (unlikely(entry == CALGARY_MAPPING_ERROR)) {
279 pr_warn("failed to allocate %u pages in iommu %p\n",
280 npages, tbl);
281 return CALGARY_MAPPING_ERROR;
282 }
283
284 /* set the return dma address */
285 ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
286
287 /* put the TCEs in the HW table */
288 tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
289 direction);
290 return ret;
291}
292
293static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
294 unsigned int npages)
295{
296 unsigned long entry;
297 unsigned long badend;
298 unsigned long flags;
299
300 /* were we called with bad_dma_address? */
301 badend = CALGARY_MAPPING_ERROR + (EMERGENCY_PAGES * PAGE_SIZE);
302 if (unlikely(dma_addr < badend)) {
303 WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
304 "address 0x%Lx\n", dma_addr);
305 return;
306 }
307
308 entry = dma_addr >> PAGE_SHIFT;
309
310 BUG_ON(entry + npages > tbl->it_size);
311
312 tce_free(tbl, entry, npages);
313
314 spin_lock_irqsave(&tbl->it_lock, flags);
315
316 bitmap_clear(tbl->it_map, entry, npages);
317
318 spin_unlock_irqrestore(&tbl->it_lock, flags);
319}
320
321static inline struct iommu_table *find_iommu_table(struct device *dev)
322{
323 struct pci_dev *pdev;
324 struct pci_bus *pbus;
325 struct iommu_table *tbl;
326
327 pdev = to_pci_dev(dev);
328
329 /* search up the device tree for an iommu */
330 pbus = pdev->bus;
331 do {
332 tbl = pci_iommu(pbus);
333 if (tbl && tbl->it_busno == pbus->number)
334 break;
335 tbl = NULL;
336 pbus = pbus->parent;
337 } while (pbus);
338
339 BUG_ON(tbl && (tbl->it_busno != pbus->number));
340
341 return tbl;
342}
343
344static void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
345 int nelems,enum dma_data_direction dir,
346 unsigned long attrs)
347{
348 struct iommu_table *tbl = find_iommu_table(dev);
349 struct scatterlist *s;
350 int i;
351
352 if (!translation_enabled(tbl))
353 return;
354
355 for_each_sg(sglist, s, nelems, i) {
356 unsigned int npages;
357 dma_addr_t dma = s->dma_address;
358 unsigned int dmalen = s->dma_length;
359
360 if (dmalen == 0)
361 break;
362
363 npages = iommu_num_pages(dma, dmalen, PAGE_SIZE);
364 iommu_free(tbl, dma, npages);
365 }
366}
367
368static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
369 int nelems, enum dma_data_direction dir,
370 unsigned long attrs)
371{
372 struct iommu_table *tbl = find_iommu_table(dev);
373 struct scatterlist *s;
374 unsigned long vaddr;
375 unsigned int npages;
376 unsigned long entry;
377 int i;
378
379 for_each_sg(sg, s, nelems, i) {
380 BUG_ON(!sg_page(s));
381
382 vaddr = (unsigned long) sg_virt(s);
383 npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
384
385 entry = iommu_range_alloc(dev, tbl, npages);
386 if (entry == CALGARY_MAPPING_ERROR) {
387 /* makes sure unmap knows to stop */
388 s->dma_length = 0;
389 goto error;
390 }
391
392 s->dma_address = (entry << PAGE_SHIFT) | s->offset;
393
394 /* insert into HW table */
395 tce_build(tbl, entry, npages, vaddr & PAGE_MASK, dir);
396
397 s->dma_length = s->length;
398 }
399
400 return nelems;
401error:
402 calgary_unmap_sg(dev, sg, nelems, dir, 0);
403 for_each_sg(sg, s, nelems, i) {
404 sg->dma_address = CALGARY_MAPPING_ERROR;
405 sg->dma_length = 0;
406 }
407 return 0;
408}
409
410static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
411 unsigned long offset, size_t size,
412 enum dma_data_direction dir,
413 unsigned long attrs)
414{
415 void *vaddr = page_address(page) + offset;
416 unsigned long uaddr;
417 unsigned int npages;
418 struct iommu_table *tbl = find_iommu_table(dev);
419
420 uaddr = (unsigned long)vaddr;
421 npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
422
423 return iommu_alloc(dev, tbl, vaddr, npages, dir);
424}
425
426static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
427 size_t size, enum dma_data_direction dir,
428 unsigned long attrs)
429{
430 struct iommu_table *tbl = find_iommu_table(dev);
431 unsigned int npages;
432
433 npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
434 iommu_free(tbl, dma_addr, npages);
435}
436
437static void* calgary_alloc_coherent(struct device *dev, size_t size,
438 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
439{
440 void *ret = NULL;
441 dma_addr_t mapping;
442 unsigned int npages, order;
443 struct iommu_table *tbl = find_iommu_table(dev);
444
445 size = PAGE_ALIGN(size); /* size rounded up to full pages */
446 npages = size >> PAGE_SHIFT;
447 order = get_order(size);
448
449 /* alloc enough pages (and possibly more) */
450 ret = (void *)__get_free_pages(flag, order);
451 if (!ret)
452 goto error;
453 memset(ret, 0, size);
454
455 /* set up tces to cover the allocated range */
456 mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
457 if (mapping == CALGARY_MAPPING_ERROR)
458 goto free;
459 *dma_handle = mapping;
460 return ret;
461free:
462 free_pages((unsigned long)ret, get_order(size));
463 ret = NULL;
464error:
465 return ret;
466}
467
468static void calgary_free_coherent(struct device *dev, size_t size,
469 void *vaddr, dma_addr_t dma_handle,
470 unsigned long attrs)
471{
472 unsigned int npages;
473 struct iommu_table *tbl = find_iommu_table(dev);
474
475 size = PAGE_ALIGN(size);
476 npages = size >> PAGE_SHIFT;
477
478 iommu_free(tbl, dma_handle, npages);
479 free_pages((unsigned long)vaddr, get_order(size));
480}
481
482static int calgary_mapping_error(struct device *dev, dma_addr_t dma_addr)
483{
484 return dma_addr == CALGARY_MAPPING_ERROR;
485}
486
487static const struct dma_map_ops calgary_dma_ops = {
488 .alloc = calgary_alloc_coherent,
489 .free = calgary_free_coherent,
490 .map_sg = calgary_map_sg,
491 .unmap_sg = calgary_unmap_sg,
492 .map_page = calgary_map_page,
493 .unmap_page = calgary_unmap_page,
494 .mapping_error = calgary_mapping_error,
495 .dma_supported = dma_direct_supported,
496};
497
498static inline void __iomem * busno_to_bbar(unsigned char num)
499{
500 return bus_info[num].bbar;
501}
502
503static inline int busno_to_phbid(unsigned char num)
504{
505 return bus_info[num].phbid;
506}
507
508static inline unsigned long split_queue_offset(unsigned char num)
509{
510 size_t idx = busno_to_phbid(num);
511
512 return split_queue_offsets[idx];
513}
514
515static inline unsigned long tar_offset(unsigned char num)
516{
517 size_t idx = busno_to_phbid(num);
518
519 return tar_offsets[idx];
520}
521
522static inline unsigned long phb_offset(unsigned char num)
523{
524 size_t idx = busno_to_phbid(num);
525
526 return phb_offsets[idx];
527}
528
529static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
530{
531 unsigned long target = ((unsigned long)bar) | offset;
532 return (void __iomem*)target;
533}
534
535static inline int is_calioc2(unsigned short device)
536{
537 return (device == PCI_DEVICE_ID_IBM_CALIOC2);
538}
539
540static inline int is_calgary(unsigned short device)
541{
542 return (device == PCI_DEVICE_ID_IBM_CALGARY);
543}
544
545static inline int is_cal_pci_dev(unsigned short device)
546{
547 return (is_calgary(device) || is_calioc2(device));
548}
549
550static void calgary_tce_cache_blast(struct iommu_table *tbl)
551{
552 u64 val;
553 u32 aer;
554 int i = 0;
555 void __iomem *bbar = tbl->bbar;
556 void __iomem *target;
557
558 /* disable arbitration on the bus */
559 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
560 aer = readl(target);
561 writel(0, target);
562
563 /* read plssr to ensure it got there */
564 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
565 val = readl(target);
566
567 /* poll split queues until all DMA activity is done */
568 target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
569 do {
570 val = readq(target);
571 i++;
572 } while ((val & 0xff) != 0xff && i < 100);
573 if (i == 100)
574 pr_warn("PCI bus not quiesced, continuing anyway\n");
575
576 /* invalidate TCE cache */
577 target = calgary_reg(bbar, tar_offset(tbl->it_busno));
578 writeq(tbl->tar_val, target);
579
580 /* enable arbitration */
581 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
582 writel(aer, target);
583 (void)readl(target); /* flush */
584}
585
586static void calioc2_tce_cache_blast(struct iommu_table *tbl)
587{
588 void __iomem *bbar = tbl->bbar;
589 void __iomem *target;
590 u64 val64;
591 u32 val;
592 int i = 0;
593 int count = 1;
594 unsigned char bus = tbl->it_busno;
595
596begin:
597 printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
598 "sequence - count %d\n", bus, count);
599
600 /* 1. using the Page Migration Control reg set SoftStop */
601 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
602 val = be32_to_cpu(readl(target));
603 printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
604 val |= PMR_SOFTSTOP;
605 printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
606 writel(cpu_to_be32(val), target);
607
608 /* 2. poll split queues until all DMA activity is done */
609 printk(KERN_DEBUG "2a. starting to poll split queues\n");
610 target = calgary_reg(bbar, split_queue_offset(bus));
611 do {
612 val64 = readq(target);
613 i++;
614 } while ((val64 & 0xff) != 0xff && i < 100);
615 if (i == 100)
616 pr_warn("CalIOC2: PCI bus not quiesced, continuing anyway\n");
617
618 /* 3. poll Page Migration DEBUG for SoftStopFault */
619 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
620 val = be32_to_cpu(readl(target));
621 printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
622
623 /* 4. if SoftStopFault - goto (1) */
624 if (val & PMR_SOFTSTOPFAULT) {
625 if (++count < 100)
626 goto begin;
627 else {
628 pr_warn("CalIOC2: too many SoftStopFaults, aborting TCE cache flush sequence!\n");
629 return; /* pray for the best */
630 }
631 }
632
633 /* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
634 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
635 printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
636 val = be32_to_cpu(readl(target));
637 printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
638 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
639 val = be32_to_cpu(readl(target));
640 printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
641
642 /* 6. invalidate TCE cache */
643 printk(KERN_DEBUG "6. invalidating TCE cache\n");
644 target = calgary_reg(bbar, tar_offset(bus));
645 writeq(tbl->tar_val, target);
646
647 /* 7. Re-read PMCR */
648 printk(KERN_DEBUG "7a. Re-reading PMCR\n");
649 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
650 val = be32_to_cpu(readl(target));
651 printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
652
653 /* 8. Remove HardStop */
654 printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
655 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
656 val = 0;
657 printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
658 writel(cpu_to_be32(val), target);
659 val = be32_to_cpu(readl(target));
660 printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
661}
662
663static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
664 u64 limit)
665{
666 unsigned int numpages;
667
668 limit = limit | 0xfffff;
669 limit++;
670
671 numpages = ((limit - start) >> PAGE_SHIFT);
672 iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
673}
674
675static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
676{
677 void __iomem *target;
678 u64 low, high, sizelow;
679 u64 start, limit;
680 struct iommu_table *tbl = pci_iommu(dev->bus);
681 unsigned char busnum = dev->bus->number;
682 void __iomem *bbar = tbl->bbar;
683
684 /* peripheral MEM_1 region */
685 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
686 low = be32_to_cpu(readl(target));
687 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
688 high = be32_to_cpu(readl(target));
689 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
690 sizelow = be32_to_cpu(readl(target));
691
692 start = (high << 32) | low;
693 limit = sizelow;
694
695 calgary_reserve_mem_region(dev, start, limit);
696}
697
698static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
699{
700 void __iomem *target;
701 u32 val32;
702 u64 low, high, sizelow, sizehigh;
703 u64 start, limit;
704 struct iommu_table *tbl = pci_iommu(dev->bus);
705 unsigned char busnum = dev->bus->number;
706 void __iomem *bbar = tbl->bbar;
707
708 /* is it enabled? */
709 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
710 val32 = be32_to_cpu(readl(target));
711 if (!(val32 & PHB_MEM2_ENABLE))
712 return;
713
714 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
715 low = be32_to_cpu(readl(target));
716 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
717 high = be32_to_cpu(readl(target));
718 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
719 sizelow = be32_to_cpu(readl(target));
720 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
721 sizehigh = be32_to_cpu(readl(target));
722
723 start = (high << 32) | low;
724 limit = (sizehigh << 32) | sizelow;
725
726 calgary_reserve_mem_region(dev, start, limit);
727}
728
729/*
730 * some regions of the IO address space do not get translated, so we
731 * must not give devices IO addresses in those regions. The regions
732 * are the 640KB-1MB region and the two PCI peripheral memory holes.
733 * Reserve all of them in the IOMMU bitmap to avoid giving them out
734 * later.
735 */
736static void __init calgary_reserve_regions(struct pci_dev *dev)
737{
738 unsigned int npages;
739 u64 start;
740 struct iommu_table *tbl = pci_iommu(dev->bus);
741
742 /* reserve EMERGENCY_PAGES from bad_dma_address and up */
743 iommu_range_reserve(tbl, CALGARY_MAPPING_ERROR, EMERGENCY_PAGES);
744
745 /* avoid the BIOS/VGA first 640KB-1MB region */
746 /* for CalIOC2 - avoid the entire first MB */
747 if (is_calgary(dev->device)) {
748 start = (640 * 1024);
749 npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
750 } else { /* calioc2 */
751 start = 0;
752 npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
753 }
754 iommu_range_reserve(tbl, start, npages);
755
756 /* reserve the two PCI peripheral memory regions in IO space */
757 calgary_reserve_peripheral_mem_1(dev);
758 calgary_reserve_peripheral_mem_2(dev);
759}
760
761static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
762{
763 u64 val64;
764 u64 table_phys;
765 void __iomem *target;
766 int ret;
767 struct iommu_table *tbl;
768
769 /* build TCE tables for each PHB */
770 ret = build_tce_table(dev, bbar);
771 if (ret)
772 return ret;
773
774 tbl = pci_iommu(dev->bus);
775 tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
776
777 if (is_kdump_kernel())
778 calgary_init_bitmap_from_tce_table(tbl);
779 else
780 tce_free(tbl, 0, tbl->it_size);
781
782 if (is_calgary(dev->device))
783 tbl->chip_ops = &calgary_chip_ops;
784 else if (is_calioc2(dev->device))
785 tbl->chip_ops = &calioc2_chip_ops;
786 else
787 BUG();
788
789 calgary_reserve_regions(dev);
790
791 /* set TARs for each PHB */
792 target = calgary_reg(bbar, tar_offset(dev->bus->number));
793 val64 = be64_to_cpu(readq(target));
794
795 /* zero out all TAR bits under sw control */
796 val64 &= ~TAR_SW_BITS;
797 table_phys = (u64)__pa(tbl->it_base);
798
799 val64 |= table_phys;
800
801 BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
802 val64 |= (u64) specified_table_size;
803
804 tbl->tar_val = cpu_to_be64(val64);
805
806 writeq(tbl->tar_val, target);
807 readq(target); /* flush */
808
809 return 0;
810}
811
812static void __init calgary_free_bus(struct pci_dev *dev)
813{
814 u64 val64;
815 struct iommu_table *tbl = pci_iommu(dev->bus);
816 void __iomem *target;
817 unsigned int bitmapsz;
818
819 target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
820 val64 = be64_to_cpu(readq(target));
821 val64 &= ~TAR_SW_BITS;
822 writeq(cpu_to_be64(val64), target);
823 readq(target); /* flush */
824
825 bitmapsz = tbl->it_size / BITS_PER_BYTE;
826 free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
827 tbl->it_map = NULL;
828
829 kfree(tbl);
830
831 set_pci_iommu(dev->bus, NULL);
832
833 /* Can't free bootmem allocated memory after system is up :-( */
834 bus_info[dev->bus->number].tce_space = NULL;
835}
836
837static void calgary_dump_error_regs(struct iommu_table *tbl)
838{
839 void __iomem *bbar = tbl->bbar;
840 void __iomem *target;
841 u32 csr, plssr;
842
843 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
844 csr = be32_to_cpu(readl(target));
845
846 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
847 plssr = be32_to_cpu(readl(target));
848
849 /* If no error, the agent ID in the CSR is not valid */
850 pr_emerg("DMA error on Calgary PHB 0x%x, 0x%08x@CSR 0x%08x@PLSSR\n",
851 tbl->it_busno, csr, plssr);
852}
853
854static void calioc2_dump_error_regs(struct iommu_table *tbl)
855{
856 void __iomem *bbar = tbl->bbar;
857 u32 csr, csmr, plssr, mck, rcstat;
858 void __iomem *target;
859 unsigned long phboff = phb_offset(tbl->it_busno);
860 unsigned long erroff;
861 u32 errregs[7];
862 int i;
863
864 /* dump CSR */
865 target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
866 csr = be32_to_cpu(readl(target));
867 /* dump PLSSR */
868 target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
869 plssr = be32_to_cpu(readl(target));
870 /* dump CSMR */
871 target = calgary_reg(bbar, phboff | 0x290);
872 csmr = be32_to_cpu(readl(target));
873 /* dump mck */
874 target = calgary_reg(bbar, phboff | 0x800);
875 mck = be32_to_cpu(readl(target));
876
877 pr_emerg("DMA error on CalIOC2 PHB 0x%x\n", tbl->it_busno);
878
879 pr_emerg("0x%08x@CSR 0x%08x@PLSSR 0x%08x@CSMR 0x%08x@MCK\n",
880 csr, plssr, csmr, mck);
881
882 /* dump rest of error regs */
883 pr_emerg("");
884 for (i = 0; i < ARRAY_SIZE(errregs); i++) {
885 /* err regs are at 0x810 - 0x870 */
886 erroff = (0x810 + (i * 0x10));
887 target = calgary_reg(bbar, phboff | erroff);
888 errregs[i] = be32_to_cpu(readl(target));
889 pr_cont("0x%08x@0x%lx ", errregs[i], erroff);
890 }
891 pr_cont("\n");
892
893 /* root complex status */
894 target = calgary_reg(bbar, phboff | PHB_ROOT_COMPLEX_STATUS);
895 rcstat = be32_to_cpu(readl(target));
896 printk(KERN_EMERG "Calgary: 0x%08x@0x%x\n", rcstat,
897 PHB_ROOT_COMPLEX_STATUS);
898}
899
900static void calgary_watchdog(struct timer_list *t)
901{
902 struct iommu_table *tbl = from_timer(tbl, t, watchdog_timer);
903 void __iomem *bbar = tbl->bbar;
904 u32 val32;
905 void __iomem *target;
906
907 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
908 val32 = be32_to_cpu(readl(target));
909
910 /* If no error, the agent ID in the CSR is not valid */
911 if (val32 & CSR_AGENT_MASK) {
912 tbl->chip_ops->dump_error_regs(tbl);
913
914 /* reset error */
915 writel(0, target);
916
917 /* Disable bus that caused the error */
918 target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
919 PHB_CONFIG_RW_OFFSET);
920 val32 = be32_to_cpu(readl(target));
921 val32 |= PHB_SLOT_DISABLE;
922 writel(cpu_to_be32(val32), target);
923 readl(target); /* flush */
924 } else {
925 /* Reset the timer */
926 mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
927 }
928}
929
930static void __init calgary_set_split_completion_timeout(void __iomem *bbar,
931 unsigned char busnum, unsigned long timeout)
932{
933 u64 val64;
934 void __iomem *target;
935 unsigned int phb_shift = ~0; /* silence gcc */
936 u64 mask;
937
938 switch (busno_to_phbid(busnum)) {
939 case 0: phb_shift = (63 - 19);
940 break;
941 case 1: phb_shift = (63 - 23);
942 break;
943 case 2: phb_shift = (63 - 27);
944 break;
945 case 3: phb_shift = (63 - 35);
946 break;
947 default:
948 BUG_ON(busno_to_phbid(busnum));
949 }
950
951 target = calgary_reg(bbar, CALGARY_CONFIG_REG);
952 val64 = be64_to_cpu(readq(target));
953
954 /* zero out this PHB's timer bits */
955 mask = ~(0xFUL << phb_shift);
956 val64 &= mask;
957 val64 |= (timeout << phb_shift);
958 writeq(cpu_to_be64(val64), target);
959 readq(target); /* flush */
960}
961
962static void __init calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
963{
964 unsigned char busnum = dev->bus->number;
965 void __iomem *bbar = tbl->bbar;
966 void __iomem *target;
967 u32 val;
968
969 /*
970 * CalIOC2 designers recommend setting bit 8 in 0xnDB0 to 1
971 */
972 target = calgary_reg(bbar, phb_offset(busnum) | PHB_SAVIOR_L2);
973 val = cpu_to_be32(readl(target));
974 val |= 0x00800000;
975 writel(cpu_to_be32(val), target);
976}
977
978static void __init calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
979{
980 unsigned char busnum = dev->bus->number;
981
982 /*
983 * Give split completion a longer timeout on bus 1 for aic94xx
984 * http://bugzilla.kernel.org/show_bug.cgi?id=7180
985 */
986 if (is_calgary(dev->device) && (busnum == 1))
987 calgary_set_split_completion_timeout(tbl->bbar, busnum,
988 CCR_2SEC_TIMEOUT);
989}
990
991static void __init calgary_enable_translation(struct pci_dev *dev)
992{
993 u32 val32;
994 unsigned char busnum;
995 void __iomem *target;
996 void __iomem *bbar;
997 struct iommu_table *tbl;
998
999 busnum = dev->bus->number;
1000 tbl = pci_iommu(dev->bus);
1001 bbar = tbl->bbar;
1002
1003 /* enable TCE in PHB Config Register */
1004 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
1005 val32 = be32_to_cpu(readl(target));
1006 val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
1007
1008 printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
1009 (dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
1010 "Calgary" : "CalIOC2", busnum);
1011 printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
1012 "bus.\n");
1013
1014 writel(cpu_to_be32(val32), target);
1015 readl(target); /* flush */
1016
1017 timer_setup(&tbl->watchdog_timer, calgary_watchdog, 0);
1018 mod_timer(&tbl->watchdog_timer, jiffies);
1019}
1020
1021static void __init calgary_disable_translation(struct pci_dev *dev)
1022{
1023 u32 val32;
1024 unsigned char busnum;
1025 void __iomem *target;
1026 void __iomem *bbar;
1027 struct iommu_table *tbl;
1028
1029 busnum = dev->bus->number;
1030 tbl = pci_iommu(dev->bus);
1031 bbar = tbl->bbar;
1032
1033 /* disable TCE in PHB Config Register */
1034 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
1035 val32 = be32_to_cpu(readl(target));
1036 val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
1037
1038 printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
1039 writel(cpu_to_be32(val32), target);
1040 readl(target); /* flush */
1041
1042 del_timer_sync(&tbl->watchdog_timer);
1043}
1044
1045static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
1046{
1047 pci_dev_get(dev);
1048 set_pci_iommu(dev->bus, NULL);
1049
1050 /* is the device behind a bridge? */
1051 if (dev->bus->parent)
1052 dev->bus->parent->self = dev;
1053 else
1054 dev->bus->self = dev;
1055}
1056
1057static int __init calgary_init_one(struct pci_dev *dev)
1058{
1059 void __iomem *bbar;
1060 struct iommu_table *tbl;
1061 int ret;
1062
1063 bbar = busno_to_bbar(dev->bus->number);
1064 ret = calgary_setup_tar(dev, bbar);
1065 if (ret)
1066 goto done;
1067
1068 pci_dev_get(dev);
1069
1070 if (dev->bus->parent) {
1071 if (dev->bus->parent->self)
1072 printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
1073 "bus->parent->self!\n", dev);
1074 dev->bus->parent->self = dev;
1075 } else
1076 dev->bus->self = dev;
1077
1078 tbl = pci_iommu(dev->bus);
1079 tbl->chip_ops->handle_quirks(tbl, dev);
1080
1081 calgary_enable_translation(dev);
1082
1083 return 0;
1084
1085done:
1086 return ret;
1087}
1088
1089static int __init calgary_locate_bbars(void)
1090{
1091 int ret;
1092 int rioidx, phb, bus;
1093 void __iomem *bbar;
1094 void __iomem *target;
1095 unsigned long offset;
1096 u8 start_bus, end_bus;
1097 u32 val;
1098
1099 ret = -ENODATA;
1100 for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
1101 struct rio_detail *rio = rio_devs[rioidx];
1102
1103 if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
1104 continue;
1105
1106 /* map entire 1MB of Calgary config space */
1107 bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
1108 if (!bbar)
1109 goto error;
1110
1111 for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
1112 offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
1113 target = calgary_reg(bbar, offset);
1114
1115 val = be32_to_cpu(readl(target));
1116
1117 start_bus = (u8)((val & 0x00FF0000) >> 16);
1118 end_bus = (u8)((val & 0x0000FF00) >> 8);
1119
1120 if (end_bus) {
1121 for (bus = start_bus; bus <= end_bus; bus++) {
1122 bus_info[bus].bbar = bbar;
1123 bus_info[bus].phbid = phb;
1124 }
1125 } else {
1126 bus_info[start_bus].bbar = bbar;
1127 bus_info[start_bus].phbid = phb;
1128 }
1129 }
1130 }
1131
1132 return 0;
1133
1134error:
1135 /* scan bus_info and iounmap any bbars we previously ioremap'd */
1136 for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
1137 if (bus_info[bus].bbar)
1138 iounmap(bus_info[bus].bbar);
1139
1140 return ret;
1141}
1142
1143static int __init calgary_init(void)
1144{
1145 int ret;
1146 struct pci_dev *dev = NULL;
1147 struct calgary_bus_info *info;
1148
1149 ret = calgary_locate_bbars();
1150 if (ret)
1151 return ret;
1152
1153 /* Purely for kdump kernel case */
1154 if (is_kdump_kernel())
1155 get_tce_space_from_tar();
1156
1157 do {
1158 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1159 if (!dev)
1160 break;
1161 if (!is_cal_pci_dev(dev->device))
1162 continue;
1163
1164 info = &bus_info[dev->bus->number];
1165 if (info->translation_disabled) {
1166 calgary_init_one_nontraslated(dev);
1167 continue;
1168 }
1169
1170 if (!info->tce_space && !translate_empty_slots)
1171 continue;
1172
1173 ret = calgary_init_one(dev);
1174 if (ret)
1175 goto error;
1176 } while (1);
1177
1178 dev = NULL;
1179 for_each_pci_dev(dev) {
1180 struct iommu_table *tbl;
1181
1182 tbl = find_iommu_table(&dev->dev);
1183
1184 if (translation_enabled(tbl))
1185 dev->dev.dma_ops = &calgary_dma_ops;
1186 }
1187
1188 return ret;
1189
1190error:
1191 do {
1192 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1193 if (!dev)
1194 break;
1195 if (!is_cal_pci_dev(dev->device))
1196 continue;
1197
1198 info = &bus_info[dev->bus->number];
1199 if (info->translation_disabled) {
1200 pci_dev_put(dev);
1201 continue;
1202 }
1203 if (!info->tce_space && !translate_empty_slots)
1204 continue;
1205
1206 calgary_disable_translation(dev);
1207 calgary_free_bus(dev);
1208 pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
1209 dev->dev.dma_ops = NULL;
1210 } while (1);
1211
1212 return ret;
1213}
1214
1215static inline int __init determine_tce_table_size(void)
1216{
1217 int ret;
1218
1219 if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
1220 return specified_table_size;
1221
1222 if (is_kdump_kernel() && saved_max_pfn) {
1223 /*
1224 * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
1225 * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
1226 * larger table size has twice as many entries, so shift the
1227 * max ram address by 13 to divide by 8K and then look at the
1228 * order of the result to choose between 0-7.
1229 */
1230 ret = get_order((saved_max_pfn * PAGE_SIZE) >> 13);
1231 if (ret > TCE_TABLE_SIZE_8M)
1232 ret = TCE_TABLE_SIZE_8M;
1233 } else {
1234 /*
1235 * Use 8M by default (suggested by Muli) if it's not
1236 * kdump kernel and saved_max_pfn isn't set.
1237 */
1238 ret = TCE_TABLE_SIZE_8M;
1239 }
1240
1241 return ret;
1242}
1243
1244static int __init build_detail_arrays(void)
1245{
1246 unsigned long ptr;
1247 unsigned numnodes, i;
1248 int scal_detail_size, rio_detail_size;
1249
1250 numnodes = rio_table_hdr->num_scal_dev;
1251 if (numnodes > MAX_NUMNODES){
1252 printk(KERN_WARNING
1253 "Calgary: MAX_NUMNODES too low! Defined as %d, "
1254 "but system has %d nodes.\n",
1255 MAX_NUMNODES, numnodes);
1256 return -ENODEV;
1257 }
1258
1259 switch (rio_table_hdr->version){
1260 case 2:
1261 scal_detail_size = 11;
1262 rio_detail_size = 13;
1263 break;
1264 case 3:
1265 scal_detail_size = 12;
1266 rio_detail_size = 15;
1267 break;
1268 default:
1269 printk(KERN_WARNING
1270 "Calgary: Invalid Rio Grande Table Version: %d\n",
1271 rio_table_hdr->version);
1272 return -EPROTO;
1273 }
1274
1275 ptr = ((unsigned long)rio_table_hdr) + 3;
1276 for (i = 0; i < numnodes; i++, ptr += scal_detail_size)
1277 scal_devs[i] = (struct scal_detail *)ptr;
1278
1279 for (i = 0; i < rio_table_hdr->num_rio_dev;
1280 i++, ptr += rio_detail_size)
1281 rio_devs[i] = (struct rio_detail *)ptr;
1282
1283 return 0;
1284}
1285
1286static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
1287{
1288 int dev;
1289 u32 val;
1290
1291 if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
1292 /*
1293 * FIXME: properly scan for devices across the
1294 * PCI-to-PCI bridge on every CalIOC2 port.
1295 */
1296 return 1;
1297 }
1298
1299 for (dev = 1; dev < 8; dev++) {
1300 val = read_pci_config(bus, dev, 0, 0);
1301 if (val != 0xffffffff)
1302 break;
1303 }
1304 return (val != 0xffffffff);
1305}
1306
1307/*
1308 * calgary_init_bitmap_from_tce_table():
1309 * Function for kdump case. In the second/kdump kernel initialize
1310 * the bitmap based on the tce table entries obtained from first kernel
1311 */
1312static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl)
1313{
1314 u64 *tp;
1315 unsigned int index;
1316 tp = ((u64 *)tbl->it_base);
1317 for (index = 0 ; index < tbl->it_size; index++) {
1318 if (*tp != 0x0)
1319 set_bit(index, tbl->it_map);
1320 tp++;
1321 }
1322}
1323
1324/*
1325 * get_tce_space_from_tar():
1326 * Function for kdump case. Get the tce tables from first kernel
1327 * by reading the contents of the base address register of calgary iommu
1328 */
1329static void __init get_tce_space_from_tar(void)
1330{
1331 int bus;
1332 void __iomem *target;
1333 unsigned long tce_space;
1334
1335 for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1336 struct calgary_bus_info *info = &bus_info[bus];
1337 unsigned short pci_device;
1338 u32 val;
1339
1340 val = read_pci_config(bus, 0, 0, 0);
1341 pci_device = (val & 0xFFFF0000) >> 16;
1342
1343 if (!is_cal_pci_dev(pci_device))
1344 continue;
1345 if (info->translation_disabled)
1346 continue;
1347
1348 if (calgary_bus_has_devices(bus, pci_device) ||
1349 translate_empty_slots) {
1350 target = calgary_reg(bus_info[bus].bbar,
1351 tar_offset(bus));
1352 tce_space = be64_to_cpu(readq(target));
1353 tce_space = tce_space & TAR_SW_BITS;
1354
1355 tce_space = tce_space & (~specified_table_size);
1356 info->tce_space = (u64 *)__va(tce_space);
1357 }
1358 }
1359 return;
1360}
1361
1362static int __init calgary_iommu_init(void)
1363{
1364 int ret;
1365
1366 /* ok, we're trying to use Calgary - let's roll */
1367 printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
1368
1369 ret = calgary_init();
1370 if (ret) {
1371 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
1372 "falling back to no_iommu\n", ret);
1373 return ret;
1374 }
1375
1376 return 0;
1377}
1378
1379int __init detect_calgary(void)
1380{
1381 int bus;
1382 void *tbl;
1383 int calgary_found = 0;
1384 unsigned long ptr;
1385 unsigned int offset, prev_offset;
1386 int ret;
1387
1388 /*
1389 * if the user specified iommu=off or iommu=soft or we found
1390 * another HW IOMMU already, bail out.
1391 */
1392 if (no_iommu || iommu_detected)
1393 return -ENODEV;
1394
1395 if (!use_calgary)
1396 return -ENODEV;
1397
1398 if (!early_pci_allowed())
1399 return -ENODEV;
1400
1401 printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n");
1402
1403 ptr = (unsigned long)phys_to_virt(get_bios_ebda());
1404
1405 rio_table_hdr = NULL;
1406 prev_offset = 0;
1407 offset = 0x180;
1408 /*
1409 * The next offset is stored in the 1st word.
1410 * Only parse up until the offset increases:
1411 */
1412 while (offset > prev_offset) {
1413 /* The block id is stored in the 2nd word */
1414 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
1415 /* set the pointer past the offset & block id */
1416 rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
1417 break;
1418 }
1419 prev_offset = offset;
1420 offset = *((unsigned short *)(ptr + offset));
1421 }
1422 if (!rio_table_hdr) {
1423 printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table "
1424 "in EBDA - bailing!\n");
1425 return -ENODEV;
1426 }
1427
1428 ret = build_detail_arrays();
1429 if (ret) {
1430 printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret);
1431 return -ENOMEM;
1432 }
1433
1434 specified_table_size = determine_tce_table_size();
1435
1436 for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1437 struct calgary_bus_info *info = &bus_info[bus];
1438 unsigned short pci_device;
1439 u32 val;
1440
1441 val = read_pci_config(bus, 0, 0, 0);
1442 pci_device = (val & 0xFFFF0000) >> 16;
1443
1444 if (!is_cal_pci_dev(pci_device))
1445 continue;
1446
1447 if (info->translation_disabled)
1448 continue;
1449
1450 if (calgary_bus_has_devices(bus, pci_device) ||
1451 translate_empty_slots) {
1452 /*
1453 * If it is kdump kernel, find and use tce tables
1454 * from first kernel, else allocate tce tables here
1455 */
1456 if (!is_kdump_kernel()) {
1457 tbl = alloc_tce_table();
1458 if (!tbl)
1459 goto cleanup;
1460 info->tce_space = tbl;
1461 }
1462 calgary_found = 1;
1463 }
1464 }
1465
1466 printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n",
1467 calgary_found ? "found" : "not found");
1468
1469 if (calgary_found) {
1470 iommu_detected = 1;
1471 calgary_detected = 1;
1472 printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
1473 printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d\n",
1474 specified_table_size);
1475
1476 x86_init.iommu.iommu_init = calgary_iommu_init;
1477 }
1478 return calgary_found;
1479
1480cleanup:
1481 for (--bus; bus >= 0; --bus) {
1482 struct calgary_bus_info *info = &bus_info[bus];
1483
1484 if (info->tce_space)
1485 free_tce_table(info->tce_space);
1486 }
1487 return -ENOMEM;
1488}
1489
1490static int __init calgary_parse_options(char *p)
1491{
1492 unsigned int bridge;
1493 unsigned long val;
1494 size_t len;
1495 ssize_t ret;
1496
1497 while (*p) {
1498 if (!strncmp(p, "64k", 3))
1499 specified_table_size = TCE_TABLE_SIZE_64K;
1500 else if (!strncmp(p, "128k", 4))
1501 specified_table_size = TCE_TABLE_SIZE_128K;
1502 else if (!strncmp(p, "256k", 4))
1503 specified_table_size = TCE_TABLE_SIZE_256K;
1504 else if (!strncmp(p, "512k", 4))
1505 specified_table_size = TCE_TABLE_SIZE_512K;
1506 else if (!strncmp(p, "1M", 2))
1507 specified_table_size = TCE_TABLE_SIZE_1M;
1508 else if (!strncmp(p, "2M", 2))
1509 specified_table_size = TCE_TABLE_SIZE_2M;
1510 else if (!strncmp(p, "4M", 2))
1511 specified_table_size = TCE_TABLE_SIZE_4M;
1512 else if (!strncmp(p, "8M", 2))
1513 specified_table_size = TCE_TABLE_SIZE_8M;
1514
1515 len = strlen("translate_empty_slots");
1516 if (!strncmp(p, "translate_empty_slots", len))
1517 translate_empty_slots = 1;
1518
1519 len = strlen("disable");
1520 if (!strncmp(p, "disable", len)) {
1521 p += len;
1522 if (*p == '=')
1523 ++p;
1524 if (*p == '\0')
1525 break;
1526 ret = kstrtoul(p, 0, &val);
1527 if (ret)
1528 break;
1529
1530 bridge = val;
1531 if (bridge < MAX_PHB_BUS_NUM) {
1532 printk(KERN_INFO "Calgary: disabling "
1533 "translation for PHB %#x\n", bridge);
1534 bus_info[bridge].translation_disabled = 1;
1535 }
1536 }
1537
1538 p = strpbrk(p, ",");
1539 if (!p)
1540 break;
1541
1542 p++; /* skip ',' */
1543 }
1544 return 1;
1545}
1546__setup("calgary=", calgary_parse_options);
1547
1548static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
1549{
1550 struct iommu_table *tbl;
1551 unsigned int npages;
1552 int i;
1553
1554 tbl = pci_iommu(dev->bus);
1555
1556 for (i = 0; i < 4; i++) {
1557 struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
1558
1559 /* Don't give out TCEs that map MEM resources */
1560 if (!(r->flags & IORESOURCE_MEM))
1561 continue;
1562
1563 /* 0-based? we reserve the whole 1st MB anyway */
1564 if (!r->start)
1565 continue;
1566
1567 /* cover the whole region */
1568 npages = resource_size(r) >> PAGE_SHIFT;
1569 npages++;
1570
1571 iommu_range_reserve(tbl, r->start, npages);
1572 }
1573}
1574
1575static int __init calgary_fixup_tce_spaces(void)
1576{
1577 struct pci_dev *dev = NULL;
1578 struct calgary_bus_info *info;
1579
1580 if (no_iommu || swiotlb || !calgary_detected)
1581 return -ENODEV;
1582
1583 printk(KERN_DEBUG "Calgary: fixing up tce spaces\n");
1584
1585 do {
1586 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1587 if (!dev)
1588 break;
1589 if (!is_cal_pci_dev(dev->device))
1590 continue;
1591
1592 info = &bus_info[dev->bus->number];
1593 if (info->translation_disabled)
1594 continue;
1595
1596 if (!info->tce_space)
1597 continue;
1598
1599 calgary_fixup_one_tce_space(dev);
1600
1601 } while (1);
1602
1603 return 0;
1604}
1605
1606/*
1607 * We need to be call after pcibios_assign_resources (fs_initcall level)
1608 * and before device_initcall.
1609 */
1610rootfs_initcall(calgary_fixup_tce_spaces);
1611
1612IOMMU_INIT_POST(detect_calgary);