projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 12a67cf6 SS |
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 <asm/smp.h> | |
| 8 | #include <asm/ipi.h> | |
| 9 | #include <asm/genapic.h> | |
| 10 | ||
| 11 | DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid); | |
| 12 | ||
| 13 | /* Start with all IRQs pointing to boot CPU. IRQ balancing will shift them. */ | |
| 14 | ||
| 15 | static cpumask_t x2apic_target_cpus(void) | |
| 16 | { | |
| 17 | return cpumask_of_cpu(0); | |
| 18 | } | |
| 19 | ||
| 20 | /* | |
| 21 | * for now each logical cpu is in its own vector allocation domain. | |
| 22 | */ | |
| 23 | static cpumask_t x2apic_vector_allocation_domain(int cpu) | |
| 24 | { | |
| 25 | cpumask_t domain = CPU_MASK_NONE; | |
| 26 | cpu_set(cpu, domain); | |
| 27 | return domain; | |
| 28 | } | |
| 29 | ||
| 30 | static void __x2apic_send_IPI_dest(unsigned int apicid, int vector, | |
| 31 | unsigned int dest) | |
| 32 | { | |
| 33 | unsigned long cfg; | |
| 34 | ||
| 35 | cfg = __prepare_ICR(0, vector, dest); | |
| 36 | ||
| 37 | /* | |
| 38 | * send the IPI. | |
| 39 | */ | |
| 40 | x2apic_icr_write(cfg, apicid); | |
| 41 | } | |
| 42 | ||
| 43 | /* | |
| 44 | * for now, we send the IPI's one by one in the cpumask. | |
| 45 | * TBD: Based on the cpu mask, we can send the IPI's to the cluster group | |
| 46 | * at once. We have 16 cpu's in a cluster. This will minimize IPI register | |
| 47 | * writes. | |
| 48 | */ | |
| 49 | static void x2apic_send_IPI_mask(cpumask_t mask, int vector) | |
| 50 | { | |
| 51 | unsigned long flags; | |
| 52 | unsigned long query_cpu; | |
| 53 | ||
| 54 | local_irq_save(flags); | |
| 55 | for_each_cpu_mask(query_cpu, mask) { | |
| 56 | __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_logical_apicid, query_cpu), | |
| 57 | vector, APIC_DEST_LOGICAL); | |
| 58 | } | |
| 59 | local_irq_restore(flags); | |
| 60 | } | |
| 61 | ||
| 62 | static void x2apic_send_IPI_allbutself(int vector) | |
| 63 | { | |
| 64 | cpumask_t mask = cpu_online_map; | |
| 65 | ||
| 66 | cpu_clear(smp_processor_id(), mask); | |
| 67 | ||
| 68 | if (!cpus_empty(mask)) | |
| 69 | x2apic_send_IPI_mask(mask, vector); | |
| 70 | } | |
| 71 | ||
| 72 | static void x2apic_send_IPI_all(int vector) | |
| 73 | { | |
| 74 | x2apic_send_IPI_mask(cpu_online_map, vector); | |
| 75 | } | |
| 76 | ||
| 77 | static int x2apic_apic_id_registered(void) | |
| 78 | { | |
| 79 | return 1; | |
| 80 | } | |
| 81 | ||
| 82 | static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask) | |
| 83 | { | |
| 84 | int cpu; | |
| 85 | ||
| 86 | /* | |
| 87 | * We're using fixed IRQ delivery, can only return one phys APIC ID. | |
| 88 | * May as well be the first. | |
| 89 | */ | |
| 90 | cpu = first_cpu(cpumask); | |
| 91 | if ((unsigned)cpu < NR_CPUS) | |
| 92 | return per_cpu(x86_cpu_to_logical_apicid, cpu); | |
| 93 | else | |
| 94 | return BAD_APICID; | |
| 95 | } | |
| 96 | ||
| 97 | static unsigned int x2apic_read_id(void) | |
| 98 | { | |
| 99 | return apic_read(APIC_ID); | |
| 100 | } | |
| 101 | ||
| 102 | static unsigned int phys_pkg_id(int index_msb) | |
| 103 | { | |
| 104 | return x2apic_read_id() >> index_msb; | |
| 105 | } | |
| 106 | ||
| 107 | static void x2apic_send_IPI_self(int vector) | |
| 108 | { | |
| 109 | apic_write(APIC_SELF_IPI, vector); | |
| 110 | } | |
| 111 | ||
| 112 | static void init_x2apic_ldr(void) | |
| 113 | { | |
| 114 | int cpu = smp_processor_id(); | |
| 115 | ||
| 116 | per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR); | |
| 117 | return; | |
| 118 | } | |
| 119 | ||
| 120 | struct genapic apic_x2apic_cluster = { | |
| 121 | .name = "cluster x2apic", | |
| 122 | .int_delivery_mode = dest_LowestPrio, | |
| 123 | .int_dest_mode = (APIC_DEST_LOGICAL != 0), | |
| 124 | .target_cpus = x2apic_target_cpus, | |
| 125 | .vector_allocation_domain = x2apic_vector_allocation_domain, | |
| 126 | .apic_id_registered = x2apic_apic_id_registered, | |
| 127 | .init_apic_ldr = init_x2apic_ldr, | |
| 128 | .send_IPI_all = x2apic_send_IPI_all, | |
| 129 | .send_IPI_allbutself = x2apic_send_IPI_allbutself, | |
| 130 | .send_IPI_mask = x2apic_send_IPI_mask, | |
| 131 | .send_IPI_self = x2apic_send_IPI_self, | |
| 132 | .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid, | |
| 133 | .phys_pkg_id = phys_pkg_id, | |
| 134 | .read_apic_id = x2apic_read_id, | |
| 135 | }; |