1 #include <linux/threads.h>
2 #include <linux/cpumask.h>
3 #include <linux/string.h>
4 #include <linux/kernel.h>
5 #include <linux/ctype.h>
6 #include <linux/init.h>
7 #include <linux/dmar.h>
11 #include <asm/genapic.h>
13 static int x2apic_phys
;
15 static int set_x2apic_phys_mode(char *arg
)
20 early_param("x2apic_phys", set_x2apic_phys_mode
);
22 static int __init
x2apic_acpi_madt_oem_check(char *oem_id
, char *oem_table_id
)
24 if (cpu_has_x2apic
&& x2apic_phys
)
30 /* Start with all IRQs pointing to boot CPU. IRQ balancing will shift them. */
32 static cpumask_t
x2apic_target_cpus(void)
34 return cpumask_of_cpu(0);
37 static cpumask_t
x2apic_vector_allocation_domain(int cpu
)
39 cpumask_t domain
= CPU_MASK_NONE
;
44 static void __x2apic_send_IPI_dest(unsigned int apicid
, int vector
,
49 cfg
= __prepare_ICR(0, vector
, dest
);
54 x2apic_icr_write(cfg
, apicid
);
57 static void x2apic_send_IPI_mask(cpumask_t mask
, int vector
)
60 unsigned long query_cpu
;
62 local_irq_save(flags
);
63 for_each_cpu_mask(query_cpu
, mask
) {
64 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid
, query_cpu
),
65 vector
, APIC_DEST_PHYSICAL
);
67 local_irq_restore(flags
);
70 static void x2apic_send_IPI_allbutself(int vector
)
72 cpumask_t mask
= cpu_online_map
;
74 cpu_clear(smp_processor_id(), mask
);
76 if (!cpus_empty(mask
))
77 x2apic_send_IPI_mask(mask
, vector
);
80 static void x2apic_send_IPI_all(int vector
)
82 x2apic_send_IPI_mask(cpu_online_map
, vector
);
85 static int x2apic_apic_id_registered(void)
90 static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask
)
95 * We're using fixed IRQ delivery, can only return one phys APIC ID.
96 * May as well be the first.
98 cpu
= first_cpu(cpumask
);
99 if ((unsigned)cpu
< NR_CPUS
)
100 return per_cpu(x86_cpu_to_apicid
, cpu
);
105 static unsigned int get_apic_id(unsigned long x
)
113 static unsigned long set_apic_id(unsigned int id
)
121 static unsigned int x2apic_read_id(void)
123 return apic_read(APIC_ID
);
126 static unsigned int phys_pkg_id(int index_msb
)
128 return x2apic_read_id() >> index_msb
;
131 void x2apic_send_IPI_self(int vector
)
133 apic_write(APIC_SELF_IPI
, vector
);
136 void init_x2apic_ldr(void)
141 struct genapic apic_x2apic_phys
= {
142 .name
= "physical x2apic",
143 .acpi_madt_oem_check
= x2apic_acpi_madt_oem_check
,
144 .int_delivery_mode
= dest_Fixed
,
145 .int_dest_mode
= (APIC_DEST_PHYSICAL
!= 0),
146 .target_cpus
= x2apic_target_cpus
,
147 .vector_allocation_domain
= x2apic_vector_allocation_domain
,
148 .apic_id_registered
= x2apic_apic_id_registered
,
149 .init_apic_ldr
= init_x2apic_ldr
,
150 .send_IPI_all
= x2apic_send_IPI_all
,
151 .send_IPI_allbutself
= x2apic_send_IPI_allbutself
,
152 .send_IPI_mask
= x2apic_send_IPI_mask
,
153 .send_IPI_self
= x2apic_send_IPI_self
,
154 .cpu_mask_to_apicid
= x2apic_cpu_mask_to_apicid
,
155 .phys_pkg_id
= phys_pkg_id
,
156 .get_apic_id
= get_apic_id
,
157 .set_apic_id
= set_apic_id
,
158 .apic_id_mask
= (0xFFFFFFFFu
),