x86: optimise x86's do_page_fault (C entry point for the page fault path)
[linux-2.6.git] / arch / ia64 / sn / kernel / io_common.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2006 Silicon Graphics, Inc. All rights reserved.
7  */
8
9 #include <linux/bootmem.h>
10 #include <asm/sn/types.h>
11 #include <asm/sn/addrs.h>
12 #include <asm/sn/sn_feature_sets.h>
13 #include <asm/sn/geo.h>
14 #include <asm/sn/io.h>
15 #include <asm/sn/l1.h>
16 #include <asm/sn/module.h>
17 #include <asm/sn/pcibr_provider.h>
18 #include <asm/sn/pcibus_provider_defs.h>
19 #include <asm/sn/pcidev.h>
20 #include <asm/sn/simulator.h>
21 #include <asm/sn/sn_sal.h>
22 #include <asm/sn/tioca_provider.h>
23 #include <asm/sn/tioce_provider.h>
24 #include "xtalk/hubdev.h"
25 #include "xtalk/xwidgetdev.h"
26 #include <linux/acpi.h>
27 #include <asm/sn/sn2/sn_hwperf.h>
28 #include <asm/sn/acpi.h>
29
30 extern void sn_init_cpei_timer(void);
31 extern void register_sn_procfs(void);
32 extern void sn_io_acpi_init(void);
33 extern void sn_io_init(void);
34
35
36 static struct list_head sn_sysdata_list;
37
38 /* sysdata list struct */
39 struct sysdata_el {
40         struct list_head entry;
41         void *sysdata;
42 };
43
44 int sn_ioif_inited;             /* SN I/O infrastructure initialized? */
45
46 int sn_acpi_rev;                /* SN ACPI revision */
47 EXPORT_SYMBOL_GPL(sn_acpi_rev);
48
49 struct sn_pcibus_provider *sn_pci_provider[PCIIO_ASIC_MAX_TYPES];       /* indexed by asic type */
50
51 /*
52  * Hooks and struct for unsupported pci providers
53  */
54
55 static dma_addr_t
56 sn_default_pci_map(struct pci_dev *pdev, unsigned long paddr, size_t size, int type)
57 {
58         return 0;
59 }
60
61 static void
62 sn_default_pci_unmap(struct pci_dev *pdev, dma_addr_t addr, int direction)
63 {
64         return;
65 }
66
67 static void *
68 sn_default_pci_bus_fixup(struct pcibus_bussoft *soft, struct pci_controller *controller)
69 {
70         return NULL;
71 }
72
73 static struct sn_pcibus_provider sn_pci_default_provider = {
74         .dma_map = sn_default_pci_map,
75         .dma_map_consistent = sn_default_pci_map,
76         .dma_unmap = sn_default_pci_unmap,
77         .bus_fixup = sn_default_pci_bus_fixup,
78 };
79
80 /*
81  * Retrieve the DMA Flush List given nasid, widget, and device.
82  * This list is needed to implement the WAR - Flush DMA data on PIO Reads.
83  */
84 static inline u64
85 sal_get_device_dmaflush_list(u64 nasid, u64 widget_num, u64 device_num,
86                              u64 address)
87 {
88         struct ia64_sal_retval ret_stuff;
89         ret_stuff.status = 0;
90         ret_stuff.v0 = 0;
91
92         SAL_CALL_NOLOCK(ret_stuff,
93                         (u64) SN_SAL_IOIF_GET_DEVICE_DMAFLUSH_LIST,
94                         (u64) nasid, (u64) widget_num,
95                         (u64) device_num, (u64) address, 0, 0, 0);
96         return ret_stuff.status;
97 }
98
99 /*
100  * sn_pcidev_info_get() - Retrieve the pcidev_info struct for the specified
101  *                        device.
102  */
103 inline struct pcidev_info *
104 sn_pcidev_info_get(struct pci_dev *dev)
105 {
106         struct pcidev_info *pcidev;
107
108         list_for_each_entry(pcidev,
109                             &(SN_PLATFORM_DATA(dev)->pcidev_info), pdi_list) {
110                 if (pcidev->pdi_linux_pcidev == dev)
111                         return pcidev;
112         }
113         return NULL;
114 }
115
116 /* Older PROM flush WAR
117  *
118  * 01/16/06 -- This war will be in place until a new official PROM is released.
119  * Additionally note that the struct sn_flush_device_war also has to be
120  * removed from arch/ia64/sn/include/xtalk/hubdev.h
121  */
122 static u8 war_implemented = 0;
123
124 static s64 sn_device_fixup_war(u64 nasid, u64 widget, int device,
125                                struct sn_flush_device_common *common)
126 {
127         struct sn_flush_device_war *war_list;
128         struct sn_flush_device_war *dev_entry;
129         struct ia64_sal_retval isrv = {0,0,0,0};
130
131         if (!war_implemented) {
132                 printk(KERN_WARNING "PROM version < 4.50 -- implementing old "
133                        "PROM flush WAR\n");
134                 war_implemented = 1;
135         }
136
137         war_list = kzalloc(DEV_PER_WIDGET * sizeof(*war_list), GFP_KERNEL);
138         if (!war_list)
139                 BUG();
140
141         SAL_CALL_NOLOCK(isrv, SN_SAL_IOIF_GET_WIDGET_DMAFLUSH_LIST,
142                         nasid, widget, __pa(war_list), 0, 0, 0 ,0);
143         if (isrv.status)
144                 panic("sn_device_fixup_war failed: %s\n",
145                       ia64_sal_strerror(isrv.status));
146
147         dev_entry = war_list + device;
148         memcpy(common,dev_entry, sizeof(*common));
149         kfree(war_list);
150
151         return isrv.status;
152 }
153
154 /*
155  * sn_common_hubdev_init() - This routine is called to initialize the HUB data
156  *                           structure for each node in the system.
157  */
158 void __init
159 sn_common_hubdev_init(struct hubdev_info *hubdev)
160 {
161
162         struct sn_flush_device_kernel *sn_flush_device_kernel;
163         struct sn_flush_device_kernel *dev_entry;
164         s64 status;
165         int widget, device, size;
166
167         /* Attach the error interrupt handlers */
168         if (hubdev->hdi_nasid & 1)      /* If TIO */
169                 ice_error_init(hubdev);
170         else
171                 hub_error_init(hubdev);
172
173         for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++)
174                 hubdev->hdi_xwidget_info[widget].xwi_hubinfo = hubdev;
175
176         if (!hubdev->hdi_flush_nasid_list.widget_p)
177                 return;
178
179         size = (HUB_WIDGET_ID_MAX + 1) *
180                 sizeof(struct sn_flush_device_kernel *);
181         hubdev->hdi_flush_nasid_list.widget_p =
182                 kzalloc(size, GFP_KERNEL);
183         if (!hubdev->hdi_flush_nasid_list.widget_p)
184                 BUG();
185
186         for (widget = 0; widget <= HUB_WIDGET_ID_MAX; widget++) {
187                 size = DEV_PER_WIDGET *
188                         sizeof(struct sn_flush_device_kernel);
189                 sn_flush_device_kernel = kzalloc(size, GFP_KERNEL);
190                 if (!sn_flush_device_kernel)
191                         BUG();
192
193                 dev_entry = sn_flush_device_kernel;
194                 for (device = 0; device < DEV_PER_WIDGET;
195                      device++, dev_entry++) {
196                         size = sizeof(struct sn_flush_device_common);
197                         dev_entry->common = kzalloc(size, GFP_KERNEL);
198                         if (!dev_entry->common)
199                                 BUG();
200                         if (sn_prom_feature_available(PRF_DEVICE_FLUSH_LIST))
201                                 status = sal_get_device_dmaflush_list(
202                                              hubdev->hdi_nasid, widget, device,
203                                              (u64)(dev_entry->common));
204                         else
205                                 status = sn_device_fixup_war(hubdev->hdi_nasid,
206                                                              widget, device,
207                                                              dev_entry->common);
208                         if (status != SALRET_OK)
209                                 panic("SAL call failed: %s\n",
210                                       ia64_sal_strerror(status));
211
212                         spin_lock_init(&dev_entry->sfdl_flush_lock);
213                 }
214
215                 if (sn_flush_device_kernel)
216                         hubdev->hdi_flush_nasid_list.widget_p[widget] =
217                                                          sn_flush_device_kernel;
218         }
219 }
220
221 void sn_pci_unfixup_slot(struct pci_dev *dev)
222 {
223         struct pci_dev *host_pci_dev = SN_PCIDEV_INFO(dev)->host_pci_dev;
224
225         sn_irq_unfixup(dev);
226         pci_dev_put(host_pci_dev);
227         pci_dev_put(dev);
228 }
229
230 /*
231  * sn_pci_fixup_slot()
232  */
233 void sn_pci_fixup_slot(struct pci_dev *dev, struct pcidev_info *pcidev_info,
234                        struct sn_irq_info *sn_irq_info)
235 {
236         int segment = pci_domain_nr(dev->bus);
237         struct pcibus_bussoft *bs;
238         struct pci_bus *host_pci_bus;
239         struct pci_dev *host_pci_dev;
240         unsigned int bus_no, devfn;
241
242         pci_dev_get(dev); /* for the sysdata pointer */
243
244         /* Add pcidev_info to list in pci_controller.platform_data */
245         list_add_tail(&pcidev_info->pdi_list,
246                       &(SN_PLATFORM_DATA(dev->bus)->pcidev_info));
247         /*
248          * Using the PROMs values for the PCI host bus, get the Linux
249          * PCI host_pci_dev struct and set up host bus linkages
250          */
251
252         bus_no = (pcidev_info->pdi_slot_host_handle >> 32) & 0xff;
253         devfn = pcidev_info->pdi_slot_host_handle & 0xffffffff;
254         host_pci_bus = pci_find_bus(segment, bus_no);
255         host_pci_dev = pci_get_slot(host_pci_bus, devfn);
256
257         pcidev_info->host_pci_dev = host_pci_dev;
258         pcidev_info->pdi_linux_pcidev = dev;
259         pcidev_info->pdi_host_pcidev_info = SN_PCIDEV_INFO(host_pci_dev);
260         bs = SN_PCIBUS_BUSSOFT(dev->bus);
261         pcidev_info->pdi_pcibus_info = bs;
262
263         if (bs && bs->bs_asic_type < PCIIO_ASIC_MAX_TYPES) {
264                 SN_PCIDEV_BUSPROVIDER(dev) = sn_pci_provider[bs->bs_asic_type];
265         } else {
266                 SN_PCIDEV_BUSPROVIDER(dev) = &sn_pci_default_provider;
267         }
268
269         /* Only set up IRQ stuff if this device has a host bus context */
270         if (bs && sn_irq_info->irq_irq) {
271                 pcidev_info->pdi_sn_irq_info = sn_irq_info;
272                 dev->irq = pcidev_info->pdi_sn_irq_info->irq_irq;
273                 sn_irq_fixup(dev, sn_irq_info);
274         } else {
275                 pcidev_info->pdi_sn_irq_info = NULL;
276                 kfree(sn_irq_info);
277         }
278 }
279
280 /*
281  * sn_common_bus_fixup - Perform platform specific bus fixup.
282  *                       Execute the ASIC specific fixup routine
283  *                       for this bus.
284  */
285 void
286 sn_common_bus_fixup(struct pci_bus *bus,
287                     struct pcibus_bussoft *prom_bussoft_ptr)
288 {
289         int cnode;
290         struct pci_controller *controller;
291         struct hubdev_info *hubdev_info;
292         int nasid;
293         void *provider_soft;
294         struct sn_pcibus_provider *provider;
295         struct sn_platform_data *sn_platform_data;
296
297         controller = PCI_CONTROLLER(bus);
298         /*
299          * Per-provider fixup.  Copies the bus soft structure from prom
300          * to local area and links SN_PCIBUS_BUSSOFT().
301          */
302
303         if (prom_bussoft_ptr->bs_asic_type >= PCIIO_ASIC_MAX_TYPES) {
304                 printk(KERN_WARNING "sn_common_bus_fixup: Unsupported asic type, %d",
305                        prom_bussoft_ptr->bs_asic_type);
306                 return;
307         }
308
309         if (prom_bussoft_ptr->bs_asic_type == PCIIO_ASIC_TYPE_PPB)
310                 return; /* no further fixup necessary */
311
312         provider = sn_pci_provider[prom_bussoft_ptr->bs_asic_type];
313         if (provider == NULL)
314                 panic("sn_common_bus_fixup: No provider registered for this asic type, %d",
315                       prom_bussoft_ptr->bs_asic_type);
316
317         if (provider->bus_fixup)
318                 provider_soft = (*provider->bus_fixup) (prom_bussoft_ptr,
319                                  controller);
320         else
321                 provider_soft = NULL;
322
323         /*
324          * Generic bus fixup goes here.  Don't reference prom_bussoft_ptr
325          * after this point.
326          */
327         controller->platform_data = kzalloc(sizeof(struct sn_platform_data),
328                                             GFP_KERNEL);
329         if (controller->platform_data == NULL)
330                 BUG();
331         sn_platform_data =
332                         (struct sn_platform_data *) controller->platform_data;
333         sn_platform_data->provider_soft = provider_soft;
334         INIT_LIST_HEAD(&((struct sn_platform_data *)
335                          controller->platform_data)->pcidev_info);
336         nasid = NASID_GET(SN_PCIBUS_BUSSOFT(bus)->bs_base);
337         cnode = nasid_to_cnodeid(nasid);
338         hubdev_info = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
339         SN_PCIBUS_BUSSOFT(bus)->bs_xwidget_info =
340             &(hubdev_info->hdi_xwidget_info[SN_PCIBUS_BUSSOFT(bus)->bs_xid]);
341
342         /*
343          * If the node information we obtained during the fixup phase is
344          * invalid then set controller->node to -1 (undetermined)
345          */
346         if (controller->node >= num_online_nodes()) {
347                 struct pcibus_bussoft *b = SN_PCIBUS_BUSSOFT(bus);
348
349                 printk(KERN_WARNING "Device ASIC=%u XID=%u PBUSNUM=%u "
350                        "L_IO=%lx L_MEM=%lx BASE=%lx\n",
351                        b->bs_asic_type, b->bs_xid, b->bs_persist_busnum,
352                        b->bs_legacy_io, b->bs_legacy_mem, b->bs_base);
353                 printk(KERN_WARNING "on node %d but only %d nodes online."
354                        "Association set to undetermined.\n",
355                        controller->node, num_online_nodes());
356                 controller->node = -1;
357         }
358 }
359
360 void sn_bus_store_sysdata(struct pci_dev *dev)
361 {
362         struct sysdata_el *element;
363
364         element = kzalloc(sizeof(struct sysdata_el), GFP_KERNEL);
365         if (!element) {
366                 dev_dbg(&dev->dev, "%s: out of memory!\n", __func__);
367                 return;
368         }
369         element->sysdata = SN_PCIDEV_INFO(dev);
370         list_add(&element->entry, &sn_sysdata_list);
371 }
372
373 void sn_bus_free_sysdata(void)
374 {
375         struct sysdata_el *element;
376         struct list_head *list, *safe;
377
378         list_for_each_safe(list, safe, &sn_sysdata_list) {
379                 element = list_entry(list, struct sysdata_el, entry);
380                 list_del(&element->entry);
381                 list_del(&(((struct pcidev_info *)
382                              (element->sysdata))->pdi_list));
383                 kfree(element->sysdata);
384                 kfree(element);
385         }
386         return;
387 }
388
389 /*
390  * hubdev_init_node() - Creates the HUB data structure and link them to it's
391  *                      own NODE specific data area.
392  */
393 void __init hubdev_init_node(nodepda_t * npda, cnodeid_t node)
394 {
395         struct hubdev_info *hubdev_info;
396         int size;
397         pg_data_t *pg;
398
399         size = sizeof(struct hubdev_info);
400
401         if (node >= num_online_nodes()) /* Headless/memless IO nodes */
402                 pg = NODE_DATA(0);
403         else
404                 pg = NODE_DATA(node);
405
406         hubdev_info = (struct hubdev_info *)alloc_bootmem_node(pg, size);
407
408         npda->pdinfo = (void *)hubdev_info;
409 }
410
411 geoid_t
412 cnodeid_get_geoid(cnodeid_t cnode)
413 {
414         struct hubdev_info *hubdev;
415
416         hubdev = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
417         return hubdev->hdi_geoid;
418 }
419
420 void sn_generate_path(struct pci_bus *pci_bus, char *address)
421 {
422         nasid_t nasid;
423         cnodeid_t cnode;
424         geoid_t geoid;
425         moduleid_t moduleid;
426         u16 bricktype;
427
428         nasid = NASID_GET(SN_PCIBUS_BUSSOFT(pci_bus)->bs_base);
429         cnode = nasid_to_cnodeid(nasid);
430         geoid = cnodeid_get_geoid(cnode);
431         moduleid = geo_module(geoid);
432
433         sprintf(address, "module_%c%c%c%c%.2d",
434                 '0'+RACK_GET_CLASS(MODULE_GET_RACK(moduleid)),
435                 '0'+RACK_GET_GROUP(MODULE_GET_RACK(moduleid)),
436                 '0'+RACK_GET_NUM(MODULE_GET_RACK(moduleid)),
437                 MODULE_GET_BTCHAR(moduleid), MODULE_GET_BPOS(moduleid));
438
439         /* Tollhouse requires slot id to be displayed */
440         bricktype = MODULE_GET_BTYPE(moduleid);
441         if ((bricktype == L1_BRICKTYPE_191010) ||
442             (bricktype == L1_BRICKTYPE_1932))
443                         sprintf(address, "%s^%d", address, geo_slot(geoid));
444 }
445
446 void __devinit
447 sn_pci_fixup_bus(struct pci_bus *bus)
448 {
449
450         if (SN_ACPI_BASE_SUPPORT())
451                 sn_acpi_bus_fixup(bus);
452         else
453                 sn_bus_fixup(bus);
454 }
455
456 /*
457  * sn_io_early_init - Perform early IO (and some non-IO) initialization.
458  *                    In particular, setup the sn_pci_provider[] array.
459  *                    This needs to be done prior to any bus scanning
460  *                    (acpi_scan_init()) in the ACPI case, as the SN
461  *                    bus fixup code will reference the array.
462  */
463 static int __init
464 sn_io_early_init(void)
465 {
466         int i;
467
468         if (!ia64_platform_is("sn2") || IS_RUNNING_ON_FAKE_PROM())
469                 return 0;
470
471         /* we set the acpi revision to that of the DSDT table OEM rev. */
472         {
473                 struct acpi_table_header *header = NULL;
474
475                 acpi_get_table(ACPI_SIG_DSDT, 1, &header);
476                 BUG_ON(header == NULL);
477                 sn_acpi_rev = header->oem_revision;
478         }
479
480         /*
481          * prime sn_pci_provider[].  Individual provider init routines will
482          * override their respective default entries.
483          */
484
485         for (i = 0; i < PCIIO_ASIC_MAX_TYPES; i++)
486                 sn_pci_provider[i] = &sn_pci_default_provider;
487
488         pcibr_init_provider();
489         tioca_init_provider();
490         tioce_init_provider();
491
492         /*
493          * This is needed to avoid bounce limit checks in the blk layer
494          */
495         ia64_max_iommu_merge_mask = ~PAGE_MASK;
496
497         sn_irq_lh_init();
498         INIT_LIST_HEAD(&sn_sysdata_list);
499         sn_init_cpei_timer();
500
501 #ifdef CONFIG_PROC_FS
502         register_sn_procfs();
503 #endif
504
505         {
506                 struct acpi_table_header *header;
507                 (void)acpi_get_table(ACPI_SIG_DSDT, 1, &header);
508                 printk(KERN_INFO "ACPI  DSDT OEM Rev 0x%x\n",
509                         header->oem_revision);
510         }
511         if (SN_ACPI_BASE_SUPPORT())
512                 sn_io_acpi_init();
513         else
514                 sn_io_init();
515         return 0;
516 }
517
518 arch_initcall(sn_io_early_init);
519
520 /*
521  * sn_io_late_init() - Perform any final platform specific IO initialization.
522  */
523
524 int __init
525 sn_io_late_init(void)
526 {
527         struct pci_bus *bus;
528         struct pcibus_bussoft *bussoft;
529         cnodeid_t cnode;
530         nasid_t nasid;
531         cnodeid_t near_cnode;
532
533         if (!ia64_platform_is("sn2") || IS_RUNNING_ON_FAKE_PROM())
534                 return 0;
535
536         /*
537          * Setup closest node in pci_controller->node for
538          * PIC, TIOCP, TIOCE (TIOCA does it during bus fixup using
539          * info from the PROM).
540          */
541         bus = NULL;
542         while ((bus = pci_find_next_bus(bus)) != NULL) {
543                 bussoft = SN_PCIBUS_BUSSOFT(bus);
544                 nasid = NASID_GET(bussoft->bs_base);
545                 cnode = nasid_to_cnodeid(nasid);
546                 if ((bussoft->bs_asic_type == PCIIO_ASIC_TYPE_TIOCP) ||
547                     (bussoft->bs_asic_type == PCIIO_ASIC_TYPE_TIOCE) ||
548                     (bussoft->bs_asic_type == PCIIO_ASIC_TYPE_PIC)) {
549                         /* PCI Bridge: find nearest node with CPUs */
550                         int e = sn_hwperf_get_nearest_node(cnode, NULL,
551                                                            &near_cnode);
552                         if (e < 0) {
553                                 near_cnode = (cnodeid_t)-1; /* use any node */
554                                 printk(KERN_WARNING "sn_io_late_init: failed "
555                                        "to find near node with CPUs for "
556                                        "node %d, err=%d\n", cnode, e);
557                         }
558                         PCI_CONTROLLER(bus)->node = near_cnode;
559                 }
560         }
561
562         sn_ioif_inited = 1;     /* SN I/O infrastructure now initialized */
563
564         return 0;
565 }
566
567 fs_initcall(sn_io_late_init);
568
569 EXPORT_SYMBOL(sn_pci_unfixup_slot);
570 EXPORT_SYMBOL(sn_bus_store_sysdata);
571 EXPORT_SYMBOL(sn_bus_free_sysdata);
572 EXPORT_SYMBOL(sn_generate_path);
573