1/*
2 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
3 *
4 * Drives the local APIC in "clustered mode".
5 */
6#include <linux/threads.h>
7#include <linux/cpumask.h>
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/dmi.h>
11#include <linux/smp.h>
12
13#include <asm/apicdef.h>
14#include <asm/fixmap.h>
15#include <asm/mpspec.h>
16#include <asm/apic.h>
17#include <asm/ipi.h>
18
19static unsigned bigsmp_get_apic_id(unsigned long x)
20{
21	return (x >> 24) & 0xFF;
22}
23
24static int bigsmp_apic_id_registered(void)
25{
26	return 1;
27}
28
29static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
30{
31	return 0;
32}
33
34static int bigsmp_early_logical_apicid(int cpu)
35{
36	/* on bigsmp, logical apicid is the same as physical */
37	return early_per_cpu(x86_cpu_to_apicid, cpu);
38}
39
40static inline unsigned long calculate_ldr(int cpu)
41{
42	unsigned long val, id;
43
44	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
45	id = per_cpu(x86_bios_cpu_apicid, cpu);
46	val |= SET_APIC_LOGICAL_ID(id);
47
48	return val;
49}
50
51/*
52 * Set up the logical destination ID.
53 *
54 * Intel recommends to set DFR, LDR and TPR before enabling
55 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
56 * document number 292116).  So here it goes...
57 */
58static void bigsmp_init_apic_ldr(void)
59{
60	unsigned long val;
61	int cpu = smp_processor_id();
62
63	apic_write(APIC_DFR, APIC_DFR_FLAT);
64	val = calculate_ldr(cpu);
65	apic_write(APIC_LDR, val);
66}
67
68static void bigsmp_setup_apic_routing(void)
69{
70	printk(KERN_INFO
71		"Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
72		nr_ioapics);
73}
74
75static int bigsmp_cpu_present_to_apicid(int mps_cpu)
76{
77	if (mps_cpu < nr_cpu_ids)
78		return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
79
80	return BAD_APICID;
81}
82
83static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
84{
85	/* For clustered we don't have a good way to do this yet - hack */
86	physids_promote(0xFFL, retmap);
87}
88
89static int bigsmp_check_phys_apicid_present(int phys_apicid)
90{
91	return 1;
92}
93
94static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
95{
96	return cpuid_apic >> index_msb;
97}
98
99static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector)
100{
101	default_send_IPI_mask_sequence_phys(mask, vector);
102}
103
104static void bigsmp_send_IPI_allbutself(int vector)
105{
106	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
107}
108
109static void bigsmp_send_IPI_all(int vector)
110{
111	bigsmp_send_IPI_mask(cpu_online_mask, vector);
112}
113
114static int dmi_bigsmp; /* can be set by dmi scanners */
115
116static int hp_ht_bigsmp(const struct dmi_system_id *d)
117{
118	printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
119	dmi_bigsmp = 1;
120
121	return 0;
122}
123
124
125static const struct dmi_system_id bigsmp_dmi_table[] = {
126	{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
127		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
128			DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
129		}
130	},
131
132	{ hp_ht_bigsmp, "HP ProLiant DL740",
133		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
134			DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
135		}
136	},
137	{ } /* NULL entry stops DMI scanning */
138};
139
140static int probe_bigsmp(void)
141{
142	if (def_to_bigsmp)
143		dmi_bigsmp = 1;
144	else
145		dmi_check_system(bigsmp_dmi_table);
146
147	return dmi_bigsmp;
148}
149
150static struct apic apic_bigsmp = {
151
152	.name				= "bigsmp",
153	.probe				= probe_bigsmp,
154	.acpi_madt_oem_check		= NULL,
155	.apic_id_valid			= default_apic_id_valid,
156	.apic_id_registered		= bigsmp_apic_id_registered,
157
158	.irq_delivery_mode		= dest_Fixed,
159	/* phys delivery to target CPU: */
160	.irq_dest_mode			= 0,
161
162	.target_cpus			= default_target_cpus,
163	.disable_esr			= 1,
164	.dest_logical			= 0,
165	.check_apicid_used		= bigsmp_check_apicid_used,
166
167	.vector_allocation_domain	= default_vector_allocation_domain,
168	.init_apic_ldr			= bigsmp_init_apic_ldr,
169
170	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
171	.setup_apic_routing		= bigsmp_setup_apic_routing,
172	.cpu_present_to_apicid		= bigsmp_cpu_present_to_apicid,
173	.apicid_to_cpu_present		= physid_set_mask_of_physid,
174	.check_phys_apicid_present	= bigsmp_check_phys_apicid_present,
175	.phys_pkg_id			= bigsmp_phys_pkg_id,
176
177	.get_apic_id			= bigsmp_get_apic_id,
178	.set_apic_id			= NULL,
179	.apic_id_mask			= 0xFF << 24,
180
181	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
182
183	.send_IPI_mask			= bigsmp_send_IPI_mask,
184	.send_IPI_mask_allbutself	= NULL,
185	.send_IPI_allbutself		= bigsmp_send_IPI_allbutself,
186	.send_IPI_all			= bigsmp_send_IPI_all,
187	.send_IPI_self			= default_send_IPI_self,
188
189	.wait_for_init_deassert		= true,
190	.inquire_remote_apic		= default_inquire_remote_apic,
191
192	.read				= native_apic_mem_read,
193	.write				= native_apic_mem_write,
194	.eoi_write			= native_apic_mem_write,
195	.icr_read			= native_apic_icr_read,
196	.icr_write			= native_apic_icr_write,
197	.wait_icr_idle			= native_apic_wait_icr_idle,
198	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
199
200	.x86_32_early_logical_apicid	= bigsmp_early_logical_apicid,
201};
202
203void __init generic_bigsmp_probe(void)
204{
205	unsigned int cpu;
206
207	if (!probe_bigsmp())
208		return;
209
210	apic = &apic_bigsmp;
211
212	for_each_possible_cpu(cpu) {
213		if (early_per_cpu(x86_cpu_to_logical_apicid,
214				  cpu) == BAD_APICID)
215			continue;
216		early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
217			bigsmp_early_logical_apicid(cpu);
218	}
219
220	pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
221}
222
223apic_driver(apic_bigsmp);
224