2 * IBM Summit-Specific Code
4 * Written By: Matthew Dobson, IBM Corporation
6 * Copyright (c) 2003 IBM Corp.
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.
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
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.
25 * Send feedback to <colpatch@us.ibm.com>
30 #include <linux/init.h>
32 #include <asm/bios_ebda.h>
35 * APIC driver for the IBM "Summit" chipset.
37 #include <linux/threads.h>
38 #include <linux/cpumask.h>
39 #include <asm/mpspec.h>
42 #include <asm/fixmap.h>
43 #include <asm/apicdef.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>
51 static unsigned summit_get_apic_id(unsigned long x)
53 return (x >> 24) & 0xFF;
56 static inline void summit_send_IPI_mask(const struct cpumask *mask, int vector)
58 default_send_IPI_mask_sequence_logical(mask, vector);
61 static void summit_send_IPI_allbutself(int vector)
63 default_send_IPI_mask_allbutself_logical(cpu_online_mask, vector);
66 static void summit_send_IPI_all(int vector)
68 summit_send_IPI_mask(cpu_online_mask, vector);
73 extern int use_cyclone;
75 #ifdef CONFIG_X86_SUMMIT_NUMA
76 static void setup_summit(void);
78 static inline void setup_summit(void) {}
81 static int summit_mps_oem_check(struct mpc_table *mpc, char *oem,
84 if (!strncmp(oem, "IBM ENSW", 8) &&
85 (!strncmp(productid, "VIGIL SMP", 9)
86 || !strncmp(productid, "EXA", 3)
87 || !strncmp(productid, "RUTHLESS SMP", 12))){
88 mark_tsc_unstable("Summit based system");
89 use_cyclone = 1; /*enable cyclone-timer*/
96 /* Hook from generic ACPI tables.c */
97 static int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
99 if (!strncmp(oem_id, "IBM", 3) &&
100 (!strncmp(oem_table_id, "SERVIGIL", 8)
101 || !strncmp(oem_table_id, "EXA", 3))){
102 mark_tsc_unstable("Summit based system");
103 use_cyclone = 1; /*enable cyclone-timer*/
110 struct rio_table_hdr {
111 unsigned char version; /* Version number of this data structure */
112 /* Version 3 adds chassis_num & WP_index */
113 unsigned char num_scal_dev; /* # of Scalability devices (Twisters for Vigil) */
114 unsigned char num_rio_dev; /* # of RIO I/O devices (Cyclones and Winnipegs) */
115 } __attribute__((packed));
118 unsigned char node_id; /* Scalability Node ID */
119 unsigned long CBAR; /* Address of 1MB register space */
120 unsigned char port0node; /* Node ID port connected to: 0xFF=None */
121 unsigned char port0port; /* Port num port connected to: 0,1,2, or 0xFF=None */
122 unsigned char port1node; /* Node ID port connected to: 0xFF = None */
123 unsigned char port1port; /* Port num port connected to: 0,1,2, or 0xFF=None */
124 unsigned char port2node; /* Node ID port connected to: 0xFF = None */
125 unsigned char port2port; /* Port num port connected to: 0,1,2, or 0xFF=None */
126 unsigned char chassis_num; /* 1 based Chassis number (1 = boot node) */
127 } __attribute__((packed));
130 unsigned char node_id; /* RIO Node ID */
131 unsigned long BBAR; /* Address of 1MB register space */
132 unsigned char type; /* Type of device */
133 unsigned char owner_id; /* For WPEG: Node ID of Cyclone that owns this WPEG*/
134 /* For CYC: Node ID of Twister that owns this CYC */
135 unsigned char port0node; /* Node ID port connected to: 0xFF=None */
136 unsigned char port0port; /* Port num port connected to: 0,1,2, or 0xFF=None */
137 unsigned char port1node; /* Node ID port connected to: 0xFF=None */
138 unsigned char port1port; /* Port num port connected to: 0,1,2, or 0xFF=None */
139 unsigned char first_slot; /* For WPEG: Lowest slot number below this WPEG */
141 unsigned char status; /* For WPEG: Bit 0 = 1 : the XAPIC is used */
142 /* = 0 : the XAPIC is not used, ie:*/
143 /* ints fwded to another XAPIC */
144 /* Bits1:7 Reserved */
145 /* For CYC: Bits0:7 Reserved */
146 unsigned char WP_index; /* For WPEG: WPEG instance index - lower ones have */
147 /* lower slot numbers/PCI bus numbers */
148 /* For CYC: No meaning */
149 unsigned char chassis_num; /* 1 based Chassis number */
150 /* For LookOut WPEGs this field indicates the */
151 /* Expansion Chassis #, enumerated from Boot */
152 /* Node WPEG external port, then Boot Node CYC */
153 /* external port, then Next Vigil chassis WPEG */
154 /* external port, etc. */
155 /* Shared Lookouts have only 1 chassis number (the */
156 /* first one assigned) */
157 } __attribute__((packed));
161 CompatTwister = 0, /* Compatibility Twister */
162 AltTwister = 1, /* Alternate Twister of internal 8-way */
163 CompatCyclone = 2, /* Compatibility Cyclone */
164 AltCyclone = 3, /* Alternate Cyclone of internal 8-way */
165 CompatWPEG = 4, /* Compatibility WPEG */
166 AltWPEG = 5, /* Second Planar WPEG */
167 LookOutAWPEG = 6, /* LookOut WPEG */
168 LookOutBWPEG = 7, /* LookOut WPEG */
171 static inline int is_WPEG(struct rio_detail *rio){
172 return (rio->type == CompatWPEG || rio->type == AltWPEG ||
173 rio->type == LookOutAWPEG || rio->type == LookOutBWPEG);
177 /* In clustered mode, the high nibble of APIC ID is a cluster number.
178 * The low nibble is a 4-bit bitmap. */
179 #define XAPIC_DEST_CPUS_SHIFT 4
180 #define XAPIC_DEST_CPUS_MASK ((1u << XAPIC_DEST_CPUS_SHIFT) - 1)
181 #define XAPIC_DEST_CLUSTER_MASK (XAPIC_DEST_CPUS_MASK << XAPIC_DEST_CPUS_SHIFT)
183 #define SUMMIT_APIC_DFR_VALUE (APIC_DFR_CLUSTER)
185 static const struct cpumask *summit_target_cpus(void)
187 /* CPU_MASK_ALL (0xff) has undefined behaviour with
188 * dest_LowestPrio mode logical clustered apic interrupt routing
189 * Just start on cpu 0. IRQ balancing will spread load
191 return cpumask_of(0);
194 static unsigned long summit_check_apicid_used(physid_mask_t bitmap, int apicid)
199 /* we don't use the phys_cpu_present_map to indicate apicid presence */
200 static unsigned long summit_check_apicid_present(int bit)
205 static void summit_init_apic_ldr(void)
207 unsigned long val, id;
209 u8 my_id = (u8)hard_smp_processor_id();
210 u8 my_cluster = APIC_CLUSTER(my_id);
215 /* Create logical APIC IDs by counting CPUs already in cluster. */
216 for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
217 lid = cpu_2_logical_apicid[i];
218 if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
222 /* We only have a 4 wide bitmap in cluster mode. If a deranged
223 * BIOS puts 5 CPUs in one APIC cluster, we're hosed. */
224 BUG_ON(count >= XAPIC_DEST_CPUS_SHIFT);
225 id = my_cluster | (1UL << count);
226 apic_write(APIC_DFR, SUMMIT_APIC_DFR_VALUE);
227 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
228 val |= SET_APIC_LOGICAL_ID(id);
229 apic_write(APIC_LDR, val);
232 static int summit_apic_id_registered(void)
237 static void summit_setup_apic_routing(void)
239 printk("Enabling APIC mode: Summit. Using %d I/O APICs\n",
243 static int summit_apicid_to_node(int logical_apicid)
246 return apicid_2_node[hard_smp_processor_id()];
252 /* Mapping from cpu number to logical apicid */
253 static inline int summit_cpu_to_logical_apicid(int cpu)
256 if (cpu >= nr_cpu_ids)
258 return cpu_2_logical_apicid[cpu];
260 return logical_smp_processor_id();
264 static int summit_cpu_present_to_apicid(int mps_cpu)
266 if (mps_cpu < nr_cpu_ids)
267 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
272 static physid_mask_t summit_ioapic_phys_id_map(physid_mask_t phys_id_map)
274 /* For clustered we don't have a good way to do this yet - hack */
275 return physids_promote(0x0F);
278 static physid_mask_t summit_apicid_to_cpu_present(int apicid)
280 return physid_mask_of_physid(0);
283 static int summit_check_phys_apicid_present(int boot_cpu_physical_apicid)
288 static unsigned int summit_cpu_mask_to_apicid(const struct cpumask *cpumask)
290 unsigned int round = 0;
294 * The cpus in the mask must all be on the apic cluster.
296 for_each_cpu(cpu, cpumask) {
297 int new_apicid = summit_cpu_to_logical_apicid(cpu);
299 if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
300 printk("%s: Not a valid mask!\n", __func__);
303 apicid |= new_apicid;
309 static unsigned int summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
310 const struct cpumask *andmask)
312 int apicid = summit_cpu_to_logical_apicid(0);
313 cpumask_var_t cpumask;
315 if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
318 cpumask_and(cpumask, inmask, andmask);
319 cpumask_and(cpumask, cpumask, cpu_online_mask);
320 apicid = summit_cpu_mask_to_apicid(cpumask);
322 free_cpumask_var(cpumask);
328 * cpuid returns the value latched in the HW at reset, not the APIC ID
329 * register's value. For any box whose BIOS changes APIC IDs, like
330 * clustered APIC systems, we must use hard_smp_processor_id.
332 * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
334 static int summit_phys_pkg_id(int cpuid_apic, int index_msb)
336 return hard_smp_processor_id() >> index_msb;
339 static int probe_summit(void)
341 /* probed later in mptable/ACPI hooks */
345 static void summit_vector_allocation_domain(int cpu, struct cpumask *retmask)
347 /* Careful. Some cpus do not strictly honor the set of cpus
348 * specified in the interrupt destination when using lowest
349 * priority interrupt delivery mode.
351 * In particular there was a hyperthreading cpu observed to
352 * deliver interrupts to the wrong hyperthread when only one
353 * hyperthread was specified in the interrupt desitination.
355 cpumask_clear(retmask);
356 cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
359 #ifdef CONFIG_X86_SUMMIT_NUMA
360 static struct rio_table_hdr *rio_table_hdr;
361 static struct scal_detail *scal_devs[MAX_NUMNODES];
362 static struct rio_detail *rio_devs[MAX_NUMNODES*4];
364 #ifndef CONFIG_X86_NUMAQ
365 static int mp_bus_id_to_node[MAX_MP_BUSSES];
368 static int setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
370 int twister = 0, node = 0;
371 int i, bus, num_buses;
373 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
374 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
375 twister = rio_devs[i]->owner_id;
379 if (i == rio_table_hdr->num_rio_dev) {
380 printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __func__);
384 for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
385 if (scal_devs[i]->node_id == twister) {
386 node = scal_devs[i]->node_id;
390 if (i == rio_table_hdr->num_scal_dev) {
391 printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __func__);
395 switch (rio_devs[wpeg_num]->type) {
398 * The Compatibility Winnipeg controls the 2 legacy buses,
399 * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
400 * a PCI-PCI bridge card is used in either slot: total 5 buses.
406 * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
407 * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
408 * the "extra" buses for each of those slots: total 7 buses.
415 * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
416 * & the "extra" buses for each of those slots: total 9 buses.
421 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __func__);
425 for (bus = last_bus; bus < last_bus + num_buses; bus++)
426 mp_bus_id_to_node[bus] = node;
430 static int build_detail_arrays(void)
433 int i, scal_detail_size, rio_detail_size;
435 if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
436 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);
440 switch (rio_table_hdr->version) {
442 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __func__, rio_table_hdr->version);
445 scal_detail_size = 11;
446 rio_detail_size = 13;
449 scal_detail_size = 12;
450 rio_detail_size = 15;
454 ptr = (unsigned long)rio_table_hdr + 3;
455 for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
456 scal_devs[i] = (struct scal_detail *)ptr;
458 for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
459 rio_devs[i] = (struct rio_detail *)ptr;
464 void setup_summit(void)
467 unsigned short offset;
468 int i, next_wpeg, next_bus = 0;
470 /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
471 ptr = get_bios_ebda();
472 ptr = (unsigned long)phys_to_virt(ptr);
474 rio_table_hdr = NULL;
477 /* The block id is stored in the 2nd word */
478 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
479 /* set the pointer past the offset & block id */
480 rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
483 /* The next offset is stored in the 1st word. 0 means no more */
484 offset = *((unsigned short *)(ptr + offset));
486 if (!rio_table_hdr) {
487 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __func__);
491 if (!build_detail_arrays())
494 /* The first Winnipeg we're looking for has an index of 0 */
497 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
498 if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
499 /* It's the Winnipeg we're looking for! */
500 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
506 * If we go through all Rio devices and don't find one with
507 * the next index, it means we've found all the Winnipegs,
508 * and thus all the PCI buses.
510 if (i == rio_table_hdr->num_rio_dev)
512 } while (next_wpeg != 0);
516 struct apic apic_summit = {
519 .probe = probe_summit,
520 .acpi_madt_oem_check = summit_acpi_madt_oem_check,
521 .apic_id_registered = summit_apic_id_registered,
523 .irq_delivery_mode = dest_LowestPrio,
524 /* logical delivery broadcast to all CPUs: */
527 .target_cpus = summit_target_cpus,
529 .dest_logical = APIC_DEST_LOGICAL,
530 .check_apicid_used = summit_check_apicid_used,
531 .check_apicid_present = summit_check_apicid_present,
533 .vector_allocation_domain = summit_vector_allocation_domain,
534 .init_apic_ldr = summit_init_apic_ldr,
536 .ioapic_phys_id_map = summit_ioapic_phys_id_map,
537 .setup_apic_routing = summit_setup_apic_routing,
538 .multi_timer_check = NULL,
539 .apicid_to_node = summit_apicid_to_node,
540 .cpu_to_logical_apicid = summit_cpu_to_logical_apicid,
541 .cpu_present_to_apicid = summit_cpu_present_to_apicid,
542 .apicid_to_cpu_present = summit_apicid_to_cpu_present,
543 .setup_portio_remap = NULL,
544 .check_phys_apicid_present = summit_check_phys_apicid_present,
545 .enable_apic_mode = NULL,
546 .phys_pkg_id = summit_phys_pkg_id,
547 .mps_oem_check = summit_mps_oem_check,
549 .get_apic_id = summit_get_apic_id,
551 .apic_id_mask = 0xFF << 24,
553 .cpu_mask_to_apicid = summit_cpu_mask_to_apicid,
554 .cpu_mask_to_apicid_and = summit_cpu_mask_to_apicid_and,
556 .send_IPI_mask = summit_send_IPI_mask,
557 .send_IPI_mask_allbutself = NULL,
558 .send_IPI_allbutself = summit_send_IPI_allbutself,
559 .send_IPI_all = summit_send_IPI_all,
560 .send_IPI_self = default_send_IPI_self,
562 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
563 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
565 .wait_for_init_deassert = default_wait_for_init_deassert,
567 .smp_callin_clear_local_apic = NULL,
568 .inquire_remote_apic = default_inquire_remote_apic,
570 .read = native_apic_mem_read,
571 .write = native_apic_mem_write,
572 .icr_read = native_apic_icr_read,
573 .icr_write = native_apic_icr_write,
574 .wait_icr_idle = native_apic_wait_icr_idle,
575 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,