2 * Copyright 2004 James Cleverdon, IBM.
3 * Subject to the GNU Public License, v.2
5 * Flat APIC subarch code.
7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
11 #include <linux/errno.h>
12 #include <linux/threads.h>
13 #include <linux/cpumask.h>
14 #include <linux/string.h>
15 #include <linux/kernel.h>
16 #include <linux/ctype.h>
17 #include <linux/init.h>
20 #include <asm/genapic.h>
22 static cpumask_t
flat_target_cpus(void)
24 return cpu_online_map
;
27 static cpumask_t
flat_vector_allocation_domain(int cpu
)
29 /* Careful. Some cpus do not strictly honor the set of cpus
30 * specified in the interrupt destination when using lowest
31 * priority interrupt delivery mode.
33 * In particular there was a hyperthreading cpu observed to
34 * deliver interrupts to the wrong hyperthread when only one
35 * hyperthread was specified in the interrupt desitination.
37 cpumask_t domain
= { { [0] = APIC_ALL_CPUS
, } };
42 * Set up the logical destination ID.
44 * Intel recommends to set DFR, LDR and TPR before enabling
45 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
46 * document number 292116). So here it goes...
48 static void flat_init_apic_ldr(void)
51 unsigned long num
, id
;
53 num
= smp_processor_id();
55 apic_write(APIC_DFR
, APIC_DFR_FLAT
);
56 val
= apic_read(APIC_LDR
) & ~APIC_LDR_MASK
;
57 val
|= SET_APIC_LOGICAL_ID(id
);
58 apic_write(APIC_LDR
, val
);
61 static void flat_send_IPI_mask(cpumask_t cpumask
, int vector
)
63 unsigned long mask
= cpus_addr(cpumask
)[0];
66 local_irq_save(flags
);
67 __send_IPI_dest_field(mask
, vector
, APIC_DEST_LOGICAL
);
68 local_irq_restore(flags
);
71 static void flat_send_IPI_allbutself(int vector
)
73 #ifdef CONFIG_HOTPLUG_CPU
78 if (hotplug
|| vector
== NMI_VECTOR
) {
79 cpumask_t allbutme
= cpu_online_map
;
81 cpu_clear(smp_processor_id(), allbutme
);
83 if (!cpus_empty(allbutme
))
84 flat_send_IPI_mask(allbutme
, vector
);
85 } else if (num_online_cpus() > 1) {
86 __send_IPI_shortcut(APIC_DEST_ALLBUT
, vector
,APIC_DEST_LOGICAL
);
90 static void flat_send_IPI_all(int vector
)
92 if (vector
== NMI_VECTOR
)
93 flat_send_IPI_mask(cpu_online_map
, vector
);
95 __send_IPI_shortcut(APIC_DEST_ALLINC
, vector
, APIC_DEST_LOGICAL
);
98 static int flat_apic_id_registered(void)
100 return physid_isset(GET_APIC_ID(read_apic_id()), phys_cpu_present_map
);
103 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask
)
105 return cpus_addr(cpumask
)[0] & APIC_ALL_CPUS
;
108 static unsigned int phys_pkg_id(int index_msb
)
110 return hard_smp_processor_id() >> index_msb
;
113 struct genapic apic_flat
= {
115 .int_delivery_mode
= dest_LowestPrio
,
116 .int_dest_mode
= (APIC_DEST_LOGICAL
!= 0),
117 .target_cpus
= flat_target_cpus
,
118 .vector_allocation_domain
= flat_vector_allocation_domain
,
119 .apic_id_registered
= flat_apic_id_registered
,
120 .init_apic_ldr
= flat_init_apic_ldr
,
121 .send_IPI_all
= flat_send_IPI_all
,
122 .send_IPI_allbutself
= flat_send_IPI_allbutself
,
123 .send_IPI_mask
= flat_send_IPI_mask
,
124 .cpu_mask_to_apicid
= flat_cpu_mask_to_apicid
,
125 .phys_pkg_id
= phys_pkg_id
,
129 * Physflat mode is used when there are more than 8 CPUs on a AMD system.
130 * We cannot use logical delivery in this case because the mask
131 * overflows, so use physical mode.
134 static cpumask_t
physflat_target_cpus(void)
136 return cpu_online_map
;
139 static cpumask_t
physflat_vector_allocation_domain(int cpu
)
141 cpumask_t domain
= CPU_MASK_NONE
;
142 cpu_set(cpu
, domain
);
147 static void physflat_send_IPI_mask(cpumask_t cpumask
, int vector
)
149 send_IPI_mask_sequence(cpumask
, vector
);
152 static void physflat_send_IPI_allbutself(int vector
)
154 cpumask_t allbutme
= cpu_online_map
;
156 cpu_clear(smp_processor_id(), allbutme
);
157 physflat_send_IPI_mask(allbutme
, vector
);
160 static void physflat_send_IPI_all(int vector
)
162 physflat_send_IPI_mask(cpu_online_map
, vector
);
165 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask
)
170 * We're using fixed IRQ delivery, can only return one phys APIC ID.
171 * May as well be the first.
173 cpu
= first_cpu(cpumask
);
174 if ((unsigned)cpu
< NR_CPUS
)
175 return per_cpu(x86_cpu_to_apicid
, cpu
);
180 struct genapic apic_physflat
= {
181 .name
= "physical flat",
182 .int_delivery_mode
= dest_Fixed
,
183 .int_dest_mode
= (APIC_DEST_PHYSICAL
!= 0),
184 .target_cpus
= physflat_target_cpus
,
185 .vector_allocation_domain
= physflat_vector_allocation_domain
,
186 .apic_id_registered
= flat_apic_id_registered
,
187 .init_apic_ldr
= flat_init_apic_ldr
,/*not needed, but shouldn't hurt*/
188 .send_IPI_all
= physflat_send_IPI_all
,
189 .send_IPI_allbutself
= physflat_send_IPI_allbutself
,
190 .send_IPI_mask
= physflat_send_IPI_mask
,
191 .cpu_mask_to_apicid
= physflat_cpu_mask_to_apicid
,
192 .phys_pkg_id
= phys_pkg_id
,