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1 /*
2  * IBM Summit-Specific Code
3  *
4  * Written By: Matthew Dobson, IBM Corporation
5  *
6  * Copyright (c) 2003 IBM Corp.
7  *
8  * All rights reserved.
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 (at
13  * your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18  * NON INFRINGEMENT.  See the GNU General Public License for more
19  * details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  *
25  * Send feedback to <colpatch@us.ibm.com>
26  *
27  */
28
29 #include <linux/mm.h>
30 #include <linux/init.h>
31 #include <asm/io.h>
32 #include <asm/bios_ebda.h>
33
34 /*
35  * APIC driver for the IBM "Summit" chipset.
36  */
37 #include <linux/threads.h>
38 #include <linux/cpumask.h>
39 #include <asm/mpspec.h>
40 #include <asm/apic.h>
41 #include <asm/smp.h>
42 #include <asm/fixmap.h>
43 #include <asm/apicdef.h>
44 #include <asm/ipi.h>
45 #include <linux/kernel.h>
46 #include <linux/string.h>
47 #include <linux/init.h>
48 #include <linux/gfp.h>
49 #include <linux/smp.h>
50
51 static unsigned summit_get_apic_id(unsigned long x)
52 {
53         return (x >> 24) & 0xFF;
54 }
55
56 static inline void summit_send_IPI_mask(const cpumask_t *mask, int vector)
57 {
58         default_send_IPI_mask_sequence_logical(mask, vector);
59 }
60
61 static void summit_send_IPI_allbutself(int vector)
62 {
63         cpumask_t mask = cpu_online_map;
64         cpu_clear(smp_processor_id(), mask);
65
66         if (!cpus_empty(mask))
67                 summit_send_IPI_mask(&mask, vector);
68 }
69
70 static void summit_send_IPI_all(int vector)
71 {
72         summit_send_IPI_mask(&cpu_online_map, vector);
73 }
74
75 #include <asm/tsc.h>
76
77 extern int use_cyclone;
78
79 #ifdef CONFIG_X86_SUMMIT_NUMA
80 extern void setup_summit(void);
81 #else
82 #define setup_summit()  {}
83 #endif
84
85 static int summit_mps_oem_check(struct mpc_table *mpc, char *oem,
86                 char *productid)
87 {
88         if (!strncmp(oem, "IBM ENSW", 8) &&
89                         (!strncmp(productid, "VIGIL SMP", 9)
90                          || !strncmp(productid, "EXA", 3)
91                          || !strncmp(productid, "RUTHLESS SMP", 12))){
92                 mark_tsc_unstable("Summit based system");
93                 use_cyclone = 1; /*enable cyclone-timer*/
94                 setup_summit();
95                 return 1;
96         }
97         return 0;
98 }
99
100 /* Hook from generic ACPI tables.c */
101 static int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
102 {
103         if (!strncmp(oem_id, "IBM", 3) &&
104             (!strncmp(oem_table_id, "SERVIGIL", 8)
105              || !strncmp(oem_table_id, "EXA", 3))){
106                 mark_tsc_unstable("Summit based system");
107                 use_cyclone = 1; /*enable cyclone-timer*/
108                 setup_summit();
109                 return 1;
110         }
111         return 0;
112 }
113
114 struct rio_table_hdr {
115         unsigned char version;      /* Version number of this data structure           */
116                                     /* Version 3 adds chassis_num & WP_index           */
117         unsigned char num_scal_dev; /* # of Scalability devices (Twisters for Vigil)   */
118         unsigned char num_rio_dev;  /* # of RIO I/O devices (Cyclones and Winnipegs)   */
119 } __attribute__((packed));
120
121 struct scal_detail {
122         unsigned char node_id;      /* Scalability Node ID                             */
123         unsigned long CBAR;         /* Address of 1MB register space                   */
124         unsigned char port0node;    /* Node ID port connected to: 0xFF=None            */
125         unsigned char port0port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
126         unsigned char port1node;    /* Node ID port connected to: 0xFF = None          */
127         unsigned char port1port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
128         unsigned char port2node;    /* Node ID port connected to: 0xFF = None          */
129         unsigned char port2port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
130         unsigned char chassis_num;  /* 1 based Chassis number (1 = boot node)          */
131 } __attribute__((packed));
132
133 struct rio_detail {
134         unsigned char node_id;      /* RIO Node ID                                     */
135         unsigned long BBAR;         /* Address of 1MB register space                   */
136         unsigned char type;         /* Type of device                                  */
137         unsigned char owner_id;     /* For WPEG: Node ID of Cyclone that owns this WPEG*/
138                                     /* For CYC:  Node ID of Twister that owns this CYC */
139         unsigned char port0node;    /* Node ID port connected to: 0xFF=None            */
140         unsigned char port0port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
141         unsigned char port1node;    /* Node ID port connected to: 0xFF=None            */
142         unsigned char port1port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
143         unsigned char first_slot;   /* For WPEG: Lowest slot number below this WPEG    */
144                                     /* For CYC:  0                                     */
145         unsigned char status;       /* For WPEG: Bit 0 = 1 : the XAPIC is used         */
146                                     /*                 = 0 : the XAPIC is not used, ie:*/
147                                     /*                     ints fwded to another XAPIC */
148                                     /*           Bits1:7 Reserved                      */
149                                     /* For CYC:  Bits0:7 Reserved                      */
150         unsigned char WP_index;     /* For WPEG: WPEG instance index - lower ones have */
151                                     /*           lower slot numbers/PCI bus numbers    */
152                                     /* For CYC:  No meaning                            */
153         unsigned char chassis_num;  /* 1 based Chassis number                          */
154                                     /* For LookOut WPEGs this field indicates the      */
155                                     /* Expansion Chassis #, enumerated from Boot       */
156                                     /* Node WPEG external port, then Boot Node CYC     */
157                                     /* external port, then Next Vigil chassis WPEG     */
158                                     /* external port, etc.                             */
159                                     /* Shared Lookouts have only 1 chassis number (the */
160                                     /* first one assigned)                             */
161 } __attribute__((packed));
162
163
164 typedef enum {
165         CompatTwister = 0,  /* Compatibility Twister               */
166         AltTwister    = 1,  /* Alternate Twister of internal 8-way */
167         CompatCyclone = 2,  /* Compatibility Cyclone               */
168         AltCyclone    = 3,  /* Alternate Cyclone of internal 8-way */
169         CompatWPEG    = 4,  /* Compatibility WPEG                  */
170         AltWPEG       = 5,  /* Second Planar WPEG                  */
171         LookOutAWPEG  = 6,  /* LookOut WPEG                        */
172         LookOutBWPEG  = 7,  /* LookOut WPEG                        */
173 } node_type;
174
175 static inline int is_WPEG(struct rio_detail *rio){
176         return (rio->type == CompatWPEG || rio->type == AltWPEG ||
177                 rio->type == LookOutAWPEG || rio->type == LookOutBWPEG);
178 }
179
180
181 /* In clustered mode, the high nibble of APIC ID is a cluster number.
182  * The low nibble is a 4-bit bitmap. */
183 #define XAPIC_DEST_CPUS_SHIFT   4
184 #define XAPIC_DEST_CPUS_MASK    ((1u << XAPIC_DEST_CPUS_SHIFT) - 1)
185 #define XAPIC_DEST_CLUSTER_MASK (XAPIC_DEST_CPUS_MASK << XAPIC_DEST_CPUS_SHIFT)
186
187 #define SUMMIT_APIC_DFR_VALUE   (APIC_DFR_CLUSTER)
188
189 static const cpumask_t *summit_target_cpus(void)
190 {
191         /* CPU_MASK_ALL (0xff) has undefined behaviour with
192          * dest_LowestPrio mode logical clustered apic interrupt routing
193          * Just start on cpu 0.  IRQ balancing will spread load
194          */
195         return &cpumask_of_cpu(0);
196 }
197
198 static unsigned long summit_check_apicid_used(physid_mask_t bitmap, int apicid)
199 {
200         return 0;
201 }
202
203 /* we don't use the phys_cpu_present_map to indicate apicid presence */
204 static unsigned long summit_check_apicid_present(int bit)
205 {
206         return 1;
207 }
208
209 static void summit_init_apic_ldr(void)
210 {
211         unsigned long val, id;
212         int count = 0;
213         u8 my_id = (u8)hard_smp_processor_id();
214         u8 my_cluster = APIC_CLUSTER(my_id);
215 #ifdef CONFIG_SMP
216         u8 lid;
217         int i;
218
219         /* Create logical APIC IDs by counting CPUs already in cluster. */
220         for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
221                 lid = cpu_2_logical_apicid[i];
222                 if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
223                         ++count;
224         }
225 #endif
226         /* We only have a 4 wide bitmap in cluster mode.  If a deranged
227          * BIOS puts 5 CPUs in one APIC cluster, we're hosed. */
228         BUG_ON(count >= XAPIC_DEST_CPUS_SHIFT);
229         id = my_cluster | (1UL << count);
230         apic_write(APIC_DFR, SUMMIT_APIC_DFR_VALUE);
231         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
232         val |= SET_APIC_LOGICAL_ID(id);
233         apic_write(APIC_LDR, val);
234 }
235
236 static int summit_apic_id_registered(void)
237 {
238         return 1;
239 }
240
241 static void summit_setup_apic_routing(void)
242 {
243         printk("Enabling APIC mode:  Summit.  Using %d I/O APICs\n",
244                                                 nr_ioapics);
245 }
246
247 static int summit_apicid_to_node(int logical_apicid)
248 {
249 #ifdef CONFIG_SMP
250         return apicid_2_node[hard_smp_processor_id()];
251 #else
252         return 0;
253 #endif
254 }
255
256 /* Mapping from cpu number to logical apicid */
257 static inline int summit_cpu_to_logical_apicid(int cpu)
258 {
259 #ifdef CONFIG_SMP
260         if (cpu >= nr_cpu_ids)
261                 return BAD_APICID;
262         return cpu_2_logical_apicid[cpu];
263 #else
264         return logical_smp_processor_id();
265 #endif
266 }
267
268 static int summit_cpu_present_to_apicid(int mps_cpu)
269 {
270         if (mps_cpu < nr_cpu_ids)
271                 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
272         else
273                 return BAD_APICID;
274 }
275
276 static physid_mask_t summit_ioapic_phys_id_map(physid_mask_t phys_id_map)
277 {
278         /* For clustered we don't have a good way to do this yet - hack */
279         return physids_promote(0x0F);
280 }
281
282 static physid_mask_t summit_apicid_to_cpu_present(int apicid)
283 {
284         return physid_mask_of_physid(0);
285 }
286
287 static int summit_check_phys_apicid_present(int boot_cpu_physical_apicid)
288 {
289         return 1;
290 }
291
292 static unsigned int summit_cpu_mask_to_apicid(const cpumask_t *cpumask)
293 {
294         int cpus_found = 0;
295         int num_bits_set;
296         int apicid;
297         int cpu;
298
299         num_bits_set = cpus_weight(*cpumask);
300         if (num_bits_set >= nr_cpu_ids)
301                 return BAD_APICID;
302         /*
303          * The cpus in the mask must all be on the apic cluster.
304          */
305         cpu = first_cpu(*cpumask);
306         apicid = summit_cpu_to_logical_apicid(cpu);
307
308         while (cpus_found < num_bits_set) {
309                 if (cpu_isset(cpu, *cpumask)) {
310                         int new_apicid = summit_cpu_to_logical_apicid(cpu);
311
312                         if (APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
313                                 printk("%s: Not a valid mask!\n", __func__);
314
315                                 return BAD_APICID;
316                         }
317                         apicid = apicid | new_apicid;
318                         cpus_found++;
319                 }
320                 cpu++;
321         }
322         return apicid;
323 }
324
325 static unsigned int summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
326                               const struct cpumask *andmask)
327 {
328         int apicid = summit_cpu_to_logical_apicid(0);
329         cpumask_var_t cpumask;
330
331         if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
332                 return apicid;
333
334         cpumask_and(cpumask, inmask, andmask);
335         cpumask_and(cpumask, cpumask, cpu_online_mask);
336         apicid = summit_cpu_mask_to_apicid(cpumask);
337
338         free_cpumask_var(cpumask);
339
340         return apicid;
341 }
342
343 /*
344  * cpuid returns the value latched in the HW at reset, not the APIC ID
345  * register's value.  For any box whose BIOS changes APIC IDs, like
346  * clustered APIC systems, we must use hard_smp_processor_id.
347  *
348  * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
349  */
350 static int summit_phys_pkg_id(int cpuid_apic, int index_msb)
351 {
352         return hard_smp_processor_id() >> index_msb;
353 }
354
355 static int probe_summit(void)
356 {
357         /* probed later in mptable/ACPI hooks */
358         return 0;
359 }
360
361 static void summit_vector_allocation_domain(int cpu, cpumask_t *retmask)
362 {
363         /* Careful. Some cpus do not strictly honor the set of cpus
364          * specified in the interrupt destination when using lowest
365          * priority interrupt delivery mode.
366          *
367          * In particular there was a hyperthreading cpu observed to
368          * deliver interrupts to the wrong hyperthread when only one
369          * hyperthread was specified in the interrupt desitination.
370          */
371         *retmask = (cpumask_t){ { [0] = APIC_ALL_CPUS, } };
372 }
373
374 #ifdef CONFIG_X86_SUMMIT_NUMA
375 static struct rio_table_hdr *rio_table_hdr __initdata;
376 static struct scal_detail   *scal_devs[MAX_NUMNODES] __initdata;
377 static struct rio_detail    *rio_devs[MAX_NUMNODES*4] __initdata;
378
379 #ifndef CONFIG_X86_NUMAQ
380 static int mp_bus_id_to_node[MAX_MP_BUSSES] __initdata;
381 #endif
382
383 static int __init setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
384 {
385         int twister = 0, node = 0;
386         int i, bus, num_buses;
387
388         for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
389                 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
390                         twister = rio_devs[i]->owner_id;
391                         break;
392                 }
393         }
394         if (i == rio_table_hdr->num_rio_dev) {
395                 printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __func__);
396                 return last_bus;
397         }
398
399         for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
400                 if (scal_devs[i]->node_id == twister) {
401                         node = scal_devs[i]->node_id;
402                         break;
403                 }
404         }
405         if (i == rio_table_hdr->num_scal_dev) {
406                 printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __func__);
407                 return last_bus;
408         }
409
410         switch (rio_devs[wpeg_num]->type) {
411         case CompatWPEG:
412                 /*
413                  * The Compatibility Winnipeg controls the 2 legacy buses,
414                  * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
415                  * a PCI-PCI bridge card is used in either slot: total 5 buses.
416                  */
417                 num_buses = 5;
418                 break;
419         case AltWPEG:
420                 /*
421                  * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
422                  * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
423                  * the "extra" buses for each of those slots: total 7 buses.
424                  */
425                 num_buses = 7;
426                 break;
427         case LookOutAWPEG:
428         case LookOutBWPEG:
429                 /*
430                  * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
431                  * & the "extra" buses for each of those slots: total 9 buses.
432                  */
433                 num_buses = 9;
434                 break;
435         default:
436                 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __func__);
437                 return last_bus;
438         }
439
440         for (bus = last_bus; bus < last_bus + num_buses; bus++)
441                 mp_bus_id_to_node[bus] = node;
442         return bus;
443 }
444
445 static int __init build_detail_arrays(void)
446 {
447         unsigned long ptr;
448         int i, scal_detail_size, rio_detail_size;
449
450         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
451                 printk(KERN_WARNING "%s: MAX_NUMNODES too low!  Defined as %d, but system has %d nodes.\n", __func__, MAX_NUMNODES, rio_table_hdr->num_scal_dev);
452                 return 0;
453         }
454
455         switch (rio_table_hdr->version) {
456         default:
457                 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __func__, rio_table_hdr->version);
458                 return 0;
459         case 2:
460                 scal_detail_size = 11;
461                 rio_detail_size = 13;
462                 break;
463         case 3:
464                 scal_detail_size = 12;
465                 rio_detail_size = 15;
466                 break;
467         }
468
469         ptr = (unsigned long)rio_table_hdr + 3;
470         for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
471                 scal_devs[i] = (struct scal_detail *)ptr;
472
473         for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
474                 rio_devs[i] = (struct rio_detail *)ptr;
475
476         return 1;
477 }
478
479 void __init setup_summit(void)
480 {
481         unsigned long           ptr;
482         unsigned short          offset;
483         int                     i, next_wpeg, next_bus = 0;
484
485         /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
486         ptr = get_bios_ebda();
487         ptr = (unsigned long)phys_to_virt(ptr);
488
489         rio_table_hdr = NULL;
490         offset = 0x180;
491         while (offset) {
492                 /* The block id is stored in the 2nd word */
493                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
494                         /* set the pointer past the offset & block id */
495                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
496                         break;
497                 }
498                 /* The next offset is stored in the 1st word.  0 means no more */
499                 offset = *((unsigned short *)(ptr + offset));
500         }
501         if (!rio_table_hdr) {
502                 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __func__);
503                 return;
504         }
505
506         if (!build_detail_arrays())
507                 return;
508
509         /* The first Winnipeg we're looking for has an index of 0 */
510         next_wpeg = 0;
511         do {
512                 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
513                         if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
514                                 /* It's the Winnipeg we're looking for! */
515                                 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
516                                 next_wpeg++;
517                                 break;
518                         }
519                 }
520                 /*
521                  * If we go through all Rio devices and don't find one with
522                  * the next index, it means we've found all the Winnipegs,
523                  * and thus all the PCI buses.
524                  */
525                 if (i == rio_table_hdr->num_rio_dev)
526                         next_wpeg = 0;
527         } while (next_wpeg != 0);
528 }
529 #endif
530
531 struct apic apic_summit = {
532
533         .name                           = "summit",
534         .probe                          = probe_summit,
535         .acpi_madt_oem_check            = summit_acpi_madt_oem_check,
536         .apic_id_registered             = summit_apic_id_registered,
537
538         .irq_delivery_mode              = dest_LowestPrio,
539         /* logical delivery broadcast to all CPUs: */
540         .irq_dest_mode                  = 1,
541
542         .target_cpus                    = summit_target_cpus,
543         .disable_esr                    = 1,
544         .dest_logical                   = APIC_DEST_LOGICAL,
545         .check_apicid_used              = summit_check_apicid_used,
546         .check_apicid_present           = summit_check_apicid_present,
547
548         .vector_allocation_domain       = summit_vector_allocation_domain,
549         .init_apic_ldr                  = summit_init_apic_ldr,
550
551         .ioapic_phys_id_map             = summit_ioapic_phys_id_map,
552         .setup_apic_routing             = summit_setup_apic_routing,
553         .multi_timer_check              = NULL,
554         .apicid_to_node                 = summit_apicid_to_node,
555         .cpu_to_logical_apicid          = summit_cpu_to_logical_apicid,
556         .cpu_present_to_apicid          = summit_cpu_present_to_apicid,
557         .apicid_to_cpu_present          = summit_apicid_to_cpu_present,
558         .setup_portio_remap             = NULL,
559         .check_phys_apicid_present      = summit_check_phys_apicid_present,
560         .enable_apic_mode               = NULL,
561         .phys_pkg_id                    = summit_phys_pkg_id,
562         .mps_oem_check                  = summit_mps_oem_check,
563
564         .get_apic_id                    = summit_get_apic_id,
565         .set_apic_id                    = NULL,
566         .apic_id_mask                   = 0xFF << 24,
567
568         .cpu_mask_to_apicid             = summit_cpu_mask_to_apicid,
569         .cpu_mask_to_apicid_and         = summit_cpu_mask_to_apicid_and,
570
571         .send_IPI_mask                  = summit_send_IPI_mask,
572         .send_IPI_mask_allbutself       = NULL,
573         .send_IPI_allbutself            = summit_send_IPI_allbutself,
574         .send_IPI_all                   = summit_send_IPI_all,
575         .send_IPI_self                  = default_send_IPI_self,
576
577         .wakeup_cpu                     = NULL,
578         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
579         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
580
581         .wait_for_init_deassert         = default_wait_for_init_deassert,
582
583         .smp_callin_clear_local_apic    = NULL,
584         .inquire_remote_apic            = default_inquire_remote_apic,
585
586         .read                           = native_apic_mem_read,
587         .write                          = native_apic_mem_write,
588         .icr_read                       = native_apic_icr_read,
589         .icr_write                      = native_apic_icr_write,
590         .wait_icr_idle                  = native_apic_wait_icr_idle,
591         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
592 };