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>
29 #define pr_fmt(fmt) "summit: %s: " fmt, __func__
32 #include <linux/init.h>
34 #include <asm/bios_ebda.h>
37 * APIC driver for the IBM "Summit" chipset.
39 #include <linux/threads.h>
40 #include <linux/cpumask.h>
41 #include <asm/mpspec.h>
44 #include <asm/fixmap.h>
45 #include <asm/apicdef.h>
47 #include <linux/kernel.h>
48 #include <linux/string.h>
49 #include <linux/gfp.h>
50 #include <linux/smp.h>
52 static unsigned summit_get_apic_id(unsigned long x)
54 return (x >> 24) & 0xFF;
57 static inline void summit_send_IPI_mask(const struct cpumask *mask, int vector)
59 default_send_IPI_mask_sequence_logical(mask, vector);
62 static void summit_send_IPI_allbutself(int vector)
64 default_send_IPI_mask_allbutself_logical(cpu_online_mask, vector);
67 static void summit_send_IPI_all(int vector)
69 summit_send_IPI_mask(cpu_online_mask, vector);
74 extern int use_cyclone;
76 #ifdef CONFIG_X86_SUMMIT_NUMA
77 static void setup_summit(void);
79 static inline void setup_summit(void) {}
82 static int summit_mps_oem_check(struct mpc_table *mpc, char *oem,
85 if (!strncmp(oem, "IBM ENSW", 8) &&
86 (!strncmp(productid, "VIGIL SMP", 9)
87 || !strncmp(productid, "EXA", 3)
88 || !strncmp(productid, "RUTHLESS SMP", 12))){
89 mark_tsc_unstable("Summit based system");
90 use_cyclone = 1; /*enable cyclone-timer*/
97 /* Hook from generic ACPI tables.c */
98 static int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
100 if (!strncmp(oem_id, "IBM", 3) &&
101 (!strncmp(oem_table_id, "SERVIGIL", 8)
102 || !strncmp(oem_table_id, "EXA", 3))){
103 mark_tsc_unstable("Summit based system");
104 use_cyclone = 1; /*enable cyclone-timer*/
111 struct rio_table_hdr {
112 unsigned char version; /* Version number of this data structure */
113 /* Version 3 adds chassis_num & WP_index */
114 unsigned char num_scal_dev; /* # of Scalability devices (Twisters for Vigil) */
115 unsigned char num_rio_dev; /* # of RIO I/O devices (Cyclones and Winnipegs) */
116 } __attribute__((packed));
119 unsigned char node_id; /* Scalability Node ID */
120 unsigned long CBAR; /* Address of 1MB register space */
121 unsigned char port0node; /* Node ID port connected to: 0xFF=None */
122 unsigned char port0port; /* Port num port connected to: 0,1,2, or 0xFF=None */
123 unsigned char port1node; /* Node ID port connected to: 0xFF = None */
124 unsigned char port1port; /* Port num port connected to: 0,1,2, or 0xFF=None */
125 unsigned char port2node; /* Node ID port connected to: 0xFF = None */
126 unsigned char port2port; /* Port num port connected to: 0,1,2, or 0xFF=None */
127 unsigned char chassis_num; /* 1 based Chassis number (1 = boot node) */
128 } __attribute__((packed));
131 unsigned char node_id; /* RIO Node ID */
132 unsigned long BBAR; /* Address of 1MB register space */
133 unsigned char type; /* Type of device */
134 unsigned char owner_id; /* For WPEG: Node ID of Cyclone that owns this WPEG*/
135 /* For CYC: Node ID of Twister that owns this CYC */
136 unsigned char port0node; /* Node ID port connected to: 0xFF=None */
137 unsigned char port0port; /* Port num port connected to: 0,1,2, or 0xFF=None */
138 unsigned char port1node; /* Node ID port connected to: 0xFF=None */
139 unsigned char port1port; /* Port num port connected to: 0,1,2, or 0xFF=None */
140 unsigned char first_slot; /* For WPEG: Lowest slot number below this WPEG */
142 unsigned char status; /* For WPEG: Bit 0 = 1 : the XAPIC is used */
143 /* = 0 : the XAPIC is not used, ie:*/
144 /* ints fwded to another XAPIC */
145 /* Bits1:7 Reserved */
146 /* For CYC: Bits0:7 Reserved */
147 unsigned char WP_index; /* For WPEG: WPEG instance index - lower ones have */
148 /* lower slot numbers/PCI bus numbers */
149 /* For CYC: No meaning */
150 unsigned char chassis_num; /* 1 based Chassis number */
151 /* For LookOut WPEGs this field indicates the */
152 /* Expansion Chassis #, enumerated from Boot */
153 /* Node WPEG external port, then Boot Node CYC */
154 /* external port, then Next Vigil chassis WPEG */
155 /* external port, etc. */
156 /* Shared Lookouts have only 1 chassis number (the */
157 /* first one assigned) */
158 } __attribute__((packed));
162 CompatTwister = 0, /* Compatibility Twister */
163 AltTwister = 1, /* Alternate Twister of internal 8-way */
164 CompatCyclone = 2, /* Compatibility Cyclone */
165 AltCyclone = 3, /* Alternate Cyclone of internal 8-way */
166 CompatWPEG = 4, /* Compatibility WPEG */
167 AltWPEG = 5, /* Second Planar WPEG */
168 LookOutAWPEG = 6, /* LookOut WPEG */
169 LookOutBWPEG = 7, /* LookOut WPEG */
172 static inline int is_WPEG(struct rio_detail *rio){
173 return (rio->type == CompatWPEG || rio->type == AltWPEG ||
174 rio->type == LookOutAWPEG || rio->type == LookOutBWPEG);
177 #define SUMMIT_APIC_DFR_VALUE (APIC_DFR_CLUSTER)
179 static const struct cpumask *summit_target_cpus(void)
181 /* CPU_MASK_ALL (0xff) has undefined behaviour with
182 * dest_LowestPrio mode logical clustered apic interrupt routing
183 * Just start on cpu 0. IRQ balancing will spread load
185 return cpumask_of(0);
188 static unsigned long summit_check_apicid_used(physid_mask_t *map, int apicid)
193 /* we don't use the phys_cpu_present_map to indicate apicid presence */
194 static unsigned long summit_check_apicid_present(int bit)
199 static int summit_early_logical_apicid(int cpu)
202 u8 my_id = early_per_cpu(x86_cpu_to_apicid, cpu);
203 u8 my_cluster = APIC_CLUSTER(my_id);
208 /* Create logical APIC IDs by counting CPUs already in cluster. */
209 for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
210 lid = early_per_cpu(x86_cpu_to_logical_apicid, i);
211 if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
215 /* We only have a 4 wide bitmap in cluster mode. If a deranged
216 * BIOS puts 5 CPUs in one APIC cluster, we're hosed. */
217 BUG_ON(count >= XAPIC_DEST_CPUS_SHIFT);
218 return my_cluster | (1UL << count);
221 static void summit_init_apic_ldr(void)
223 int cpu = smp_processor_id();
224 unsigned long id = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
227 apic_write(APIC_DFR, SUMMIT_APIC_DFR_VALUE);
228 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
229 val |= SET_APIC_LOGICAL_ID(id);
230 apic_write(APIC_LDR, val);
233 static int summit_apic_id_registered(void)
238 static void summit_setup_apic_routing(void)
240 pr_info("Enabling APIC mode: Summit. Using %d I/O APICs\n",
244 static int summit_cpu_present_to_apicid(int mps_cpu)
246 if (mps_cpu < nr_cpu_ids)
247 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
252 static void summit_ioapic_phys_id_map(physid_mask_t *phys_id_map, physid_mask_t *retmap)
254 /* For clustered we don't have a good way to do this yet - hack */
255 physids_promote(0x0FL, retmap);
258 static void summit_apicid_to_cpu_present(int apicid, physid_mask_t *retmap)
260 physid_set_mask_of_physid(0, retmap);
263 static int summit_check_phys_apicid_present(int physical_apicid)
268 static unsigned int summit_cpu_mask_to_apicid(const struct cpumask *cpumask)
270 unsigned int round = 0;
274 * The cpus in the mask must all be on the apic cluster.
276 for_each_cpu(cpu, cpumask) {
277 int new_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
279 if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
280 pr_err("Not a valid mask!\n");
283 apicid |= new_apicid;
289 static unsigned int summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
290 const struct cpumask *andmask)
292 int apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
293 cpumask_var_t cpumask;
295 if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
298 cpumask_and(cpumask, inmask, andmask);
299 cpumask_and(cpumask, cpumask, cpu_online_mask);
300 apicid = summit_cpu_mask_to_apicid(cpumask);
302 free_cpumask_var(cpumask);
308 * cpuid returns the value latched in the HW at reset, not the APIC ID
309 * register's value. For any box whose BIOS changes APIC IDs, like
310 * clustered APIC systems, we must use hard_smp_processor_id.
312 * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
314 static int summit_phys_pkg_id(int cpuid_apic, int index_msb)
316 return hard_smp_processor_id() >> index_msb;
319 static int probe_summit(void)
321 /* probed later in mptable/ACPI hooks */
325 static void summit_vector_allocation_domain(int cpu, struct cpumask *retmask)
327 /* Careful. Some cpus do not strictly honor the set of cpus
328 * specified in the interrupt destination when using lowest
329 * priority interrupt delivery mode.
331 * In particular there was a hyperthreading cpu observed to
332 * deliver interrupts to the wrong hyperthread when only one
333 * hyperthread was specified in the interrupt desitination.
335 cpumask_clear(retmask);
336 cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
339 #ifdef CONFIG_X86_SUMMIT_NUMA
340 static struct rio_table_hdr *rio_table_hdr;
341 static struct scal_detail *scal_devs[MAX_NUMNODES];
342 static struct rio_detail *rio_devs[MAX_NUMNODES*4];
344 #ifndef CONFIG_X86_NUMAQ
345 static int mp_bus_id_to_node[MAX_MP_BUSSES];
348 static int setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
350 int twister = 0, node = 0;
351 int i, bus, num_buses;
353 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
354 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
355 twister = rio_devs[i]->owner_id;
359 if (i == rio_table_hdr->num_rio_dev) {
360 pr_err("Couldn't find owner Cyclone for Winnipeg!\n");
364 for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
365 if (scal_devs[i]->node_id == twister) {
366 node = scal_devs[i]->node_id;
370 if (i == rio_table_hdr->num_scal_dev) {
371 pr_err("Couldn't find owner Twister for Cyclone!\n");
375 switch (rio_devs[wpeg_num]->type) {
378 * The Compatibility Winnipeg controls the 2 legacy buses,
379 * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
380 * a PCI-PCI bridge card is used in either slot: total 5 buses.
386 * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
387 * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
388 * the "extra" buses for each of those slots: total 7 buses.
395 * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
396 * & the "extra" buses for each of those slots: total 9 buses.
401 pr_info("Unsupported Winnipeg type!\n");
405 for (bus = last_bus; bus < last_bus + num_buses; bus++)
406 mp_bus_id_to_node[bus] = node;
410 static int build_detail_arrays(void)
413 int i, scal_detail_size, rio_detail_size;
415 if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
416 pr_warn("MAX_NUMNODES too low! Defined as %d, but system has %d nodes\n",
417 MAX_NUMNODES, rio_table_hdr->num_scal_dev);
421 switch (rio_table_hdr->version) {
423 pr_warn("Invalid Rio Grande Table Version: %d\n",
424 rio_table_hdr->version);
427 scal_detail_size = 11;
428 rio_detail_size = 13;
431 scal_detail_size = 12;
432 rio_detail_size = 15;
436 ptr = (unsigned long)rio_table_hdr + 3;
437 for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
438 scal_devs[i] = (struct scal_detail *)ptr;
440 for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
441 rio_devs[i] = (struct rio_detail *)ptr;
446 void setup_summit(void)
449 unsigned short offset;
450 int i, next_wpeg, next_bus = 0;
452 /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
453 ptr = get_bios_ebda();
454 ptr = (unsigned long)phys_to_virt(ptr);
456 rio_table_hdr = NULL;
459 /* The block id is stored in the 2nd word */
460 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
461 /* set the pointer past the offset & block id */
462 rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
465 /* The next offset is stored in the 1st word. 0 means no more */
466 offset = *((unsigned short *)(ptr + offset));
468 if (!rio_table_hdr) {
469 pr_err("Unable to locate Rio Grande Table in EBDA - bailing!\n");
473 if (!build_detail_arrays())
476 /* The first Winnipeg we're looking for has an index of 0 */
479 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
480 if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
481 /* It's the Winnipeg we're looking for! */
482 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
488 * If we go through all Rio devices and don't find one with
489 * the next index, it means we've found all the Winnipegs,
490 * and thus all the PCI buses.
492 if (i == rio_table_hdr->num_rio_dev)
494 } while (next_wpeg != 0);
498 static struct apic apic_summit = {
501 .probe = probe_summit,
502 .acpi_madt_oem_check = summit_acpi_madt_oem_check,
503 .apic_id_valid = default_apic_id_valid,
504 .apic_id_registered = summit_apic_id_registered,
506 .irq_delivery_mode = dest_LowestPrio,
507 /* logical delivery broadcast to all CPUs: */
510 .target_cpus = summit_target_cpus,
512 .dest_logical = APIC_DEST_LOGICAL,
513 .check_apicid_used = summit_check_apicid_used,
514 .check_apicid_present = summit_check_apicid_present,
516 .vector_allocation_domain = summit_vector_allocation_domain,
517 .init_apic_ldr = summit_init_apic_ldr,
519 .ioapic_phys_id_map = summit_ioapic_phys_id_map,
520 .setup_apic_routing = summit_setup_apic_routing,
521 .multi_timer_check = NULL,
522 .cpu_present_to_apicid = summit_cpu_present_to_apicid,
523 .apicid_to_cpu_present = summit_apicid_to_cpu_present,
524 .setup_portio_remap = NULL,
525 .check_phys_apicid_present = summit_check_phys_apicid_present,
526 .enable_apic_mode = NULL,
527 .phys_pkg_id = summit_phys_pkg_id,
528 .mps_oem_check = summit_mps_oem_check,
530 .get_apic_id = summit_get_apic_id,
532 .apic_id_mask = 0xFF << 24,
534 .cpu_mask_to_apicid = summit_cpu_mask_to_apicid,
535 .cpu_mask_to_apicid_and = summit_cpu_mask_to_apicid_and,
537 .send_IPI_mask = summit_send_IPI_mask,
538 .send_IPI_mask_allbutself = NULL,
539 .send_IPI_allbutself = summit_send_IPI_allbutself,
540 .send_IPI_all = summit_send_IPI_all,
541 .send_IPI_self = default_send_IPI_self,
543 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
544 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
546 .wait_for_init_deassert = default_wait_for_init_deassert,
548 .smp_callin_clear_local_apic = NULL,
549 .inquire_remote_apic = default_inquire_remote_apic,
551 .read = native_apic_mem_read,
552 .write = native_apic_mem_write,
553 .eoi_write = native_apic_mem_write,
554 .icr_read = native_apic_icr_read,
555 .icr_write = native_apic_icr_write,
556 .wait_icr_idle = native_apic_wait_icr_idle,
557 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
559 .x86_32_early_logical_apicid = summit_early_logical_apicid,
562 apic_driver(apic_summit);