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19#include <linux/cpu.h>
20#include <linux/errno.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/user.h>
27#include <linux/tty.h>
28#include <linux/major.h>
29#include <linux/interrupt.h>
30#include <linux/reboot.h>
31#include <linux/init.h>
32#include <linux/ioport.h>
33#include <linux/console.h>
34#include <linux/pci.h>
35#include <linux/utsname.h>
36#include <linux/adb.h>
37#include <linux/export.h>
38#include <linux/delay.h>
39#include <linux/irq.h>
40#include <linux/seq_file.h>
41#include <linux/root_dev.h>
42#include <linux/of.h>
43#include <linux/kexec.h>
44
45#include <asm/mmu.h>
46#include <asm/processor.h>
47#include <asm/io.h>
48#include <asm/pgtable.h>
49#include <asm/prom.h>
50#include <asm/rtas.h>
51#include <asm/pci-bridge.h>
52#include <asm/iommu.h>
53#include <asm/dma.h>
54#include <asm/machdep.h>
55#include <asm/irq.h>
56#include <asm/time.h>
57#include <asm/nvram.h>
58#include <asm/pmc.h>
59#include <asm/mpic.h>
60#include <asm/xics.h>
61#include <asm/ppc-pci.h>
62#include <asm/i8259.h>
63#include <asm/udbg.h>
64#include <asm/smp.h>
65#include <asm/firmware.h>
66#include <asm/eeh.h>
67#include <asm/reg.h>
68#include <asm/plpar_wrappers.h>
69
70#include "pseries.h"
71
72int CMO_PrPSP = -1;
73int CMO_SecPSP = -1;
74unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
75EXPORT_SYMBOL(CMO_PageSize);
76
77int fwnmi_active;
78
79static struct device_node *pSeries_mpic_node;
80
81static void pSeries_show_cpuinfo(struct seq_file *m)
82{
83 struct device_node *root;
84 const char *model = "";
85
86 root = of_find_node_by_path("/");
87 if (root)
88 model = of_get_property(root, "model", NULL);
89 seq_printf(m, "machine\t\t: CHRP %s\n", model);
90 of_node_put(root);
91}
92
93
94
95
96static void __init fwnmi_init(void)
97{
98 unsigned long system_reset_addr, machine_check_addr;
99
100 int ibm_nmi_register = rtas_token("ibm,nmi-register");
101 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
102 return;
103
104
105
106 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
107 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
108
109 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
110 machine_check_addr))
111 fwnmi_active = 1;
112}
113
114static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
115{
116 struct irq_chip *chip = irq_desc_get_chip(desc);
117 unsigned int cascade_irq = i8259_irq();
118
119 if (cascade_irq != NO_IRQ)
120 generic_handle_irq(cascade_irq);
121
122 chip->irq_eoi(&desc->irq_data);
123}
124
125static void __init pseries_setup_i8259_cascade(void)
126{
127 struct device_node *np, *old, *found = NULL;
128 unsigned int cascade;
129 const u32 *addrp;
130 unsigned long intack = 0;
131 int naddr;
132
133 for_each_node_by_type(np, "interrupt-controller") {
134 if (of_device_is_compatible(np, "chrp,iic")) {
135 found = np;
136 break;
137 }
138 }
139
140 if (found == NULL) {
141 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
142 return;
143 }
144
145 cascade = irq_of_parse_and_map(found, 0);
146 if (cascade == NO_IRQ) {
147 printk(KERN_ERR "pic: failed to map cascade interrupt");
148 return;
149 }
150 pr_debug("pic: cascade mapped to irq %d\n", cascade);
151
152 for (old = of_node_get(found); old != NULL ; old = np) {
153 np = of_get_parent(old);
154 of_node_put(old);
155 if (np == NULL)
156 break;
157 if (strcmp(np->name, "pci") != 0)
158 continue;
159 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
160 if (addrp == NULL)
161 continue;
162 naddr = of_n_addr_cells(np);
163 intack = addrp[naddr-1];
164 if (naddr > 1)
165 intack |= ((unsigned long)addrp[naddr-2]) << 32;
166 }
167 if (intack)
168 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
169 i8259_init(found, intack);
170 of_node_put(found);
171 irq_set_chained_handler(cascade, pseries_8259_cascade);
172}
173
174static void __init pseries_mpic_init_IRQ(void)
175{
176 struct device_node *np;
177 const unsigned int *opprop;
178 unsigned long openpic_addr = 0;
179 int naddr, n, i, opplen;
180 struct mpic *mpic;
181
182 np = of_find_node_by_path("/");
183 naddr = of_n_addr_cells(np);
184 opprop = of_get_property(np, "platform-open-pic", &opplen);
185 if (opprop != NULL) {
186 openpic_addr = of_read_number(opprop, naddr);
187 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
188 }
189 of_node_put(np);
190
191 BUG_ON(openpic_addr == 0);
192
193
194 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
195 MPIC_NO_RESET, 16, 0, " MPIC ");
196 BUG_ON(mpic == NULL);
197
198
199 opplen /= sizeof(u32);
200 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
201 unsigned long isuaddr = of_read_number(opprop + i, naddr);
202 mpic_assign_isu(mpic, n, isuaddr);
203 }
204
205
206 ppc_md.get_irq = mpic_get_irq;
207
208
209 mpic_init(mpic);
210
211
212 pseries_setup_i8259_cascade();
213}
214
215static void __init pseries_xics_init_IRQ(void)
216{
217 xics_init();
218 pseries_setup_i8259_cascade();
219}
220
221static void pseries_lpar_enable_pmcs(void)
222{
223 unsigned long set, reset;
224
225 set = 1UL << 63;
226 reset = 0;
227 plpar_hcall_norets(H_PERFMON, set, reset);
228}
229
230static void __init pseries_discover_pic(void)
231{
232 struct device_node *np;
233 const char *typep;
234
235 for_each_node_by_name(np, "interrupt-controller") {
236 typep = of_get_property(np, "compatible", NULL);
237 if (strstr(typep, "open-pic")) {
238 pSeries_mpic_node = of_node_get(np);
239 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
240 setup_kexec_cpu_down_mpic();
241 smp_init_pseries_mpic();
242 return;
243 } else if (strstr(typep, "ppc-xicp")) {
244 ppc_md.init_IRQ = pseries_xics_init_IRQ;
245 setup_kexec_cpu_down_xics();
246 smp_init_pseries_xics();
247 return;
248 }
249 }
250 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
251 " interrupt-controller\n");
252}
253
254static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
255{
256 struct of_reconfig_data *rd = data;
257 struct device_node *np = rd->dn;
258 struct pci_dn *pci = NULL;
259 int err = NOTIFY_OK;
260
261 switch (action) {
262 case OF_RECONFIG_ATTACH_NODE:
263 pci = np->parent->data;
264 if (pci) {
265 update_dn_pci_info(np, pci->phb);
266
267
268 eeh_dev_init(np, pci->phb);
269 }
270 break;
271 default:
272 err = NOTIFY_DONE;
273 break;
274 }
275 return err;
276}
277
278static struct notifier_block pci_dn_reconfig_nb = {
279 .notifier_call = pci_dn_reconfig_notifier,
280};
281
282struct kmem_cache *dtl_cache;
283
284#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
285
286
287
288
289
290static int alloc_dispatch_logs(void)
291{
292 int cpu, ret;
293 struct paca_struct *pp;
294 struct dtl_entry *dtl;
295
296 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
297 return 0;
298
299 if (!dtl_cache)
300 return 0;
301
302 for_each_possible_cpu(cpu) {
303 pp = &paca[cpu];
304 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
305 if (!dtl) {
306 pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
307 cpu);
308 pr_warn("Stolen time statistics will be unreliable\n");
309 break;
310 }
311
312 pp->dtl_ridx = 0;
313 pp->dispatch_log = dtl;
314 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
315 pp->dtl_curr = dtl;
316 }
317
318
319 dtl = get_paca()->dispatch_log;
320 get_paca()->dtl_ridx = 0;
321 get_paca()->dtl_curr = dtl;
322 get_paca()->lppaca_ptr->dtl_idx = 0;
323
324
325 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
326 ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
327 if (ret)
328 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
329 "with %d\n", smp_processor_id(),
330 hard_smp_processor_id(), ret);
331 get_paca()->lppaca_ptr->dtl_enable_mask = 2;
332
333 return 0;
334}
335#else
336static inline int alloc_dispatch_logs(void)
337{
338 return 0;
339}
340#endif
341
342static int alloc_dispatch_log_kmem_cache(void)
343{
344 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
345 DISPATCH_LOG_BYTES, 0, NULL);
346 if (!dtl_cache) {
347 pr_warn("Failed to create dispatch trace log buffer cache\n");
348 pr_warn("Stolen time statistics will be unreliable\n");
349 return 0;
350 }
351
352 return alloc_dispatch_logs();
353}
354machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
355
356static void pseries_lpar_idle(void)
357{
358
359
360
361
362
363
364 get_lppaca()->idle = 1;
365
366
367
368
369
370
371
372
373 cede_processor();
374
375 get_lppaca()->idle = 0;
376}
377
378
379
380
381
382
383
384
385long pSeries_enable_reloc_on_exc(void)
386{
387 long rc;
388 unsigned int delay, total_delay = 0;
389
390 while (1) {
391 rc = enable_reloc_on_exceptions();
392 if (!H_IS_LONG_BUSY(rc))
393 return rc;
394
395 delay = get_longbusy_msecs(rc);
396 total_delay += delay;
397 if (total_delay > 1000) {
398 pr_warn("Warning: Giving up waiting to enable "
399 "relocation on exceptions (%u msec)!\n",
400 total_delay);
401 return rc;
402 }
403
404 mdelay(delay);
405 }
406}
407EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
408
409long pSeries_disable_reloc_on_exc(void)
410{
411 long rc;
412
413 while (1) {
414 rc = disable_reloc_on_exceptions();
415 if (!H_IS_LONG_BUSY(rc))
416 return rc;
417 mdelay(get_longbusy_msecs(rc));
418 }
419}
420EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
421
422#ifdef CONFIG_KEXEC
423static void pSeries_machine_kexec(struct kimage *image)
424{
425 long rc;
426
427 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
428 rc = pSeries_disable_reloc_on_exc();
429 if (rc != H_SUCCESS)
430 pr_warning("Warning: Failed to disable relocation on "
431 "exceptions: %ld\n", rc);
432 }
433
434 default_machine_kexec(image);
435}
436#endif
437
438#ifdef __LITTLE_ENDIAN__
439long pseries_big_endian_exceptions(void)
440{
441 long rc;
442
443 while (1) {
444 rc = enable_big_endian_exceptions();
445 if (!H_IS_LONG_BUSY(rc))
446 return rc;
447 mdelay(get_longbusy_msecs(rc));
448 }
449}
450
451static long pseries_little_endian_exceptions(void)
452{
453 long rc;
454
455 while (1) {
456 rc = enable_little_endian_exceptions();
457 if (!H_IS_LONG_BUSY(rc))
458 return rc;
459 mdelay(get_longbusy_msecs(rc));
460 }
461}
462#endif
463
464static void __init pSeries_setup_arch(void)
465{
466 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
467
468
469 pseries_discover_pic();
470
471
472
473
474
475
476 loops_per_jiffy = 50000000;
477
478 fwnmi_init();
479
480
481 pci_add_flags(PCI_PROBE_ONLY);
482
483
484 init_pci_config_tokens();
485 find_and_init_phbs();
486 of_reconfig_notifier_register(&pci_dn_reconfig_nb);
487
488 pSeries_nvram_init();
489
490 if (firmware_has_feature(FW_FEATURE_LPAR)) {
491 vpa_init(boot_cpuid);
492 ppc_md.power_save = pseries_lpar_idle;
493 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
494 } else {
495
496 ppc_md.enable_pmcs = power4_enable_pmcs;
497 }
498
499 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
500
501 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
502 long rc;
503
504 rc = pSeries_enable_reloc_on_exc();
505 if (rc == H_P2) {
506 pr_info("Relocation on exceptions not supported\n");
507 } else if (rc != H_SUCCESS) {
508 pr_warn("Unable to enable relocation on exceptions: "
509 "%ld\n", rc);
510 }
511 }
512}
513
514static int __init pSeries_init_panel(void)
515{
516
517#ifdef __BIG_ENDIAN__
518 ppc_md.progress("Linux ppc64\n", 0);
519#else
520 ppc_md.progress("Linux ppc64le\n", 0);
521#endif
522 ppc_md.progress(init_utsname()->version, 0);
523
524 return 0;
525}
526machine_arch_initcall(pseries, pSeries_init_panel);
527
528static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
529{
530 return plpar_hcall_norets(H_SET_DABR, dabr);
531}
532
533static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
534{
535
536 if (dabrx == 0 && dabr == 0)
537 dabrx = DABRX_USER;
538
539 dabrx &= DABRX_KERNEL | DABRX_USER;
540
541 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
542}
543
544static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
545{
546
547 dawrx &= ~DAWRX_HYP;
548
549 return plapr_set_watchpoint0(dawr, dawrx);
550}
551
552#define CMO_CHARACTERISTICS_TOKEN 44
553#define CMO_MAXLENGTH 1026
554
555void pSeries_coalesce_init(void)
556{
557 struct hvcall_mpp_x_data mpp_x_data;
558
559 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
560 powerpc_firmware_features |= FW_FEATURE_XCMO;
561 else
562 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
563}
564
565
566
567
568
569static void pSeries_cmo_feature_init(void)
570{
571 char *ptr, *key, *value, *end;
572 int call_status;
573 int page_order = IOMMU_PAGE_SHIFT_4K;
574
575 pr_debug(" -> fw_cmo_feature_init()\n");
576 spin_lock(&rtas_data_buf_lock);
577 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
578 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
579 NULL,
580 CMO_CHARACTERISTICS_TOKEN,
581 __pa(rtas_data_buf),
582 RTAS_DATA_BUF_SIZE);
583
584 if (call_status != 0) {
585 spin_unlock(&rtas_data_buf_lock);
586 pr_debug("CMO not available\n");
587 pr_debug(" <- fw_cmo_feature_init()\n");
588 return;
589 }
590
591 end = rtas_data_buf + CMO_MAXLENGTH - 2;
592 ptr = rtas_data_buf + 2;
593 key = value = ptr;
594
595 while (*ptr && (ptr <= end)) {
596
597
598
599 if (ptr[0] == '=') {
600 ptr[0] = '\0';
601 value = ptr + 1;
602 } else if (ptr[0] == '\0' || ptr[0] == ',') {
603
604 ptr[0] = '\0';
605
606 if (key == value) {
607 pr_debug("Malformed key/value pair\n");
608
609 break;
610 }
611
612 if (0 == strcmp(key, "CMOPageSize"))
613 page_order = simple_strtol(value, NULL, 10);
614 else if (0 == strcmp(key, "PrPSP"))
615 CMO_PrPSP = simple_strtol(value, NULL, 10);
616 else if (0 == strcmp(key, "SecPSP"))
617 CMO_SecPSP = simple_strtol(value, NULL, 10);
618 value = key = ptr + 1;
619 }
620 ptr++;
621 }
622
623
624
625
626 CMO_PageSize = 1 << page_order;
627 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
628
629 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
630 pr_info("CMO enabled\n");
631 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
632 CMO_SecPSP);
633 powerpc_firmware_features |= FW_FEATURE_CMO;
634 pSeries_coalesce_init();
635 } else
636 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
637 CMO_SecPSP);
638 spin_unlock(&rtas_data_buf_lock);
639 pr_debug(" <- fw_cmo_feature_init()\n");
640}
641
642
643
644
645static void __init pSeries_init_early(void)
646{
647 pr_debug(" -> pSeries_init_early()\n");
648
649#ifdef CONFIG_HVC_CONSOLE
650 if (firmware_has_feature(FW_FEATURE_LPAR))
651 hvc_vio_init_early();
652#endif
653 if (firmware_has_feature(FW_FEATURE_XDABR))
654 ppc_md.set_dabr = pseries_set_xdabr;
655 else if (firmware_has_feature(FW_FEATURE_DABR))
656 ppc_md.set_dabr = pseries_set_dabr;
657
658 if (firmware_has_feature(FW_FEATURE_SET_MODE))
659 ppc_md.set_dawr = pseries_set_dawr;
660
661 pSeries_cmo_feature_init();
662 iommu_init_early_pSeries();
663
664 pr_debug(" <- pSeries_init_early()\n");
665}
666
667
668
669
670
671
672
673
674
675
676static void pseries_power_off(void)
677{
678 int rc;
679 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
680
681 if (rtas_flash_term_hook)
682 rtas_flash_term_hook(SYS_POWER_OFF);
683
684 if (rtas_poweron_auto == 0 ||
685 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
686 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
687 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
688 } else {
689 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
690 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
691 }
692 for (;;);
693}
694
695
696
697
698
699static int __init pseries_probe_fw_features(unsigned long node,
700 const char *uname, int depth,
701 void *data)
702{
703 const char *prop;
704 int len;
705 static int hypertas_found;
706 static int vec5_found;
707
708 if (depth != 1)
709 return 0;
710
711 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
712 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
713 &len);
714 if (prop) {
715 powerpc_firmware_features |= FW_FEATURE_LPAR;
716 fw_hypertas_feature_init(prop, len);
717 }
718
719 hypertas_found = 1;
720 }
721
722 if (!strcmp(uname, "chosen")) {
723 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
724 &len);
725 if (prop)
726 fw_vec5_feature_init(prop, len);
727
728 vec5_found = 1;
729 }
730
731 return hypertas_found && vec5_found;
732}
733
734static int __init pSeries_probe(void)
735{
736 unsigned long root = of_get_flat_dt_root();
737 const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
738
739 if (dtype == NULL)
740 return 0;
741 if (strcmp(dtype, "chrp"))
742 return 0;
743
744
745
746
747 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
748 of_flat_dt_is_compatible(root, "IBM,CBEA"))
749 return 0;
750
751 pr_debug("pSeries detected, looking for LPAR capability...\n");
752
753
754 of_scan_flat_dt(pseries_probe_fw_features, NULL);
755
756#ifdef __LITTLE_ENDIAN__
757 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
758 long rc;
759
760
761
762
763
764 rc = pseries_little_endian_exceptions();
765 if (rc) {
766 ppc_md.progress("H_SET_MODE LE exception fail", 0);
767 panic("Could not enable little endian exceptions");
768 }
769 }
770#endif
771
772 if (firmware_has_feature(FW_FEATURE_LPAR))
773 hpte_init_lpar();
774 else
775 hpte_init_native();
776
777 pm_power_off = pseries_power_off;
778
779 pr_debug("Machine is%s LPAR !\n",
780 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
781
782 return 1;
783}
784
785static int pSeries_pci_probe_mode(struct pci_bus *bus)
786{
787 if (firmware_has_feature(FW_FEATURE_LPAR))
788 return PCI_PROBE_DEVTREE;
789 return PCI_PROBE_NORMAL;
790}
791
792#ifndef CONFIG_PCI
793void pSeries_final_fixup(void) { }
794#endif
795
796define_machine(pseries) {
797 .name = "pSeries",
798 .probe = pSeries_probe,
799 .setup_arch = pSeries_setup_arch,
800 .init_early = pSeries_init_early,
801 .show_cpuinfo = pSeries_show_cpuinfo,
802 .log_error = pSeries_log_error,
803 .pcibios_fixup = pSeries_final_fixup,
804 .pci_probe_mode = pSeries_pci_probe_mode,
805 .restart = rtas_restart,
806 .halt = rtas_halt,
807 .panic = rtas_os_term,
808 .get_boot_time = rtas_get_boot_time,
809 .get_rtc_time = rtas_get_rtc_time,
810 .set_rtc_time = rtas_set_rtc_time,
811 .calibrate_decr = generic_calibrate_decr,
812 .progress = rtas_progress,
813 .system_reset_exception = pSeries_system_reset_exception,
814 .machine_check_exception = pSeries_machine_check_exception,
815#ifdef CONFIG_KEXEC
816 .machine_kexec = pSeries_machine_kexec,
817#endif
818#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
819 .memory_block_size = pseries_memory_block_size,
820#endif
821};
822