19844ab11SCyrill Gorcunov /* 29844ab11SCyrill Gorcunov * NOOP APIC driver. 39844ab11SCyrill Gorcunov * 49844ab11SCyrill Gorcunov * Does almost nothing and should be substituted by a real apic driver via 59844ab11SCyrill Gorcunov * probe routine. 69844ab11SCyrill Gorcunov * 79844ab11SCyrill Gorcunov * Though in case if apic is disabled (for some reason) we try 89844ab11SCyrill Gorcunov * to not uglify the caller's code and allow to call (some) apic routines 9f88f2b4fSCyrill Gorcunov * like self-ipi, etc... 109844ab11SCyrill Gorcunov */ 119844ab11SCyrill Gorcunov 129844ab11SCyrill Gorcunov #include <linux/threads.h> 139844ab11SCyrill Gorcunov #include <linux/cpumask.h> 149844ab11SCyrill Gorcunov #include <linux/module.h> 159844ab11SCyrill Gorcunov #include <linux/string.h> 169844ab11SCyrill Gorcunov #include <linux/kernel.h> 179844ab11SCyrill Gorcunov #include <linux/ctype.h> 189844ab11SCyrill Gorcunov #include <linux/errno.h> 199844ab11SCyrill Gorcunov #include <asm/fixmap.h> 209844ab11SCyrill Gorcunov #include <asm/mpspec.h> 219844ab11SCyrill Gorcunov #include <asm/apicdef.h> 229844ab11SCyrill Gorcunov #include <asm/apic.h> 239844ab11SCyrill Gorcunov #include <asm/setup.h> 249844ab11SCyrill Gorcunov 259844ab11SCyrill Gorcunov #include <linux/smp.h> 269844ab11SCyrill Gorcunov #include <asm/ipi.h> 279844ab11SCyrill Gorcunov 289844ab11SCyrill Gorcunov #include <linux/interrupt.h> 299844ab11SCyrill Gorcunov #include <asm/acpi.h> 309844ab11SCyrill Gorcunov #include <asm/e820.h> 319844ab11SCyrill Gorcunov 32f88f2b4fSCyrill Gorcunov static void noop_init_apic_ldr(void) { } 334727da2eSThomas Gleixner static void noop_send_IPI(int cpu, int vector) { } 34f88f2b4fSCyrill Gorcunov static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { } 35f88f2b4fSCyrill Gorcunov static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { } 36f88f2b4fSCyrill Gorcunov static void noop_send_IPI_allbutself(int vector) { } 37f88f2b4fSCyrill Gorcunov static void noop_send_IPI_all(int vector) { } 38f88f2b4fSCyrill Gorcunov static void noop_send_IPI_self(int vector) { } 39f88f2b4fSCyrill Gorcunov static void noop_apic_wait_icr_idle(void) { } 40f88f2b4fSCyrill Gorcunov static void noop_apic_icr_write(u32 low, u32 id) { } 41f88f2b4fSCyrill Gorcunov 42f88f2b4fSCyrill Gorcunov static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip) 439844ab11SCyrill Gorcunov { 44f88f2b4fSCyrill Gorcunov return -1; 459844ab11SCyrill Gorcunov } 469844ab11SCyrill Gorcunov 47f88f2b4fSCyrill Gorcunov static u32 noop_safe_apic_wait_icr_idle(void) 48f88f2b4fSCyrill Gorcunov { 49f88f2b4fSCyrill Gorcunov return 0; 50f88f2b4fSCyrill Gorcunov } 519844ab11SCyrill Gorcunov 52f88f2b4fSCyrill Gorcunov static u64 noop_apic_icr_read(void) 53f88f2b4fSCyrill Gorcunov { 54f88f2b4fSCyrill Gorcunov return 0; 55f88f2b4fSCyrill Gorcunov } 56f88f2b4fSCyrill Gorcunov 57f88f2b4fSCyrill Gorcunov static int noop_phys_pkg_id(int cpuid_apic, int index_msb) 58f88f2b4fSCyrill Gorcunov { 59f88f2b4fSCyrill Gorcunov return 0; 60f88f2b4fSCyrill Gorcunov } 61f88f2b4fSCyrill Gorcunov 62f88f2b4fSCyrill Gorcunov static unsigned int noop_get_apic_id(unsigned long x) 63f88f2b4fSCyrill Gorcunov { 64f88f2b4fSCyrill Gorcunov return 0; 65f88f2b4fSCyrill Gorcunov } 669844ab11SCyrill Gorcunov 679844ab11SCyrill Gorcunov static int noop_probe(void) 689844ab11SCyrill Gorcunov { 69f88f2b4fSCyrill Gorcunov /* 70f88f2b4fSCyrill Gorcunov * NOOP apic should not ever be 71f88f2b4fSCyrill Gorcunov * enabled via probe routine 72f88f2b4fSCyrill Gorcunov */ 739844ab11SCyrill Gorcunov return 0; 749844ab11SCyrill Gorcunov } 759844ab11SCyrill Gorcunov 769844ab11SCyrill Gorcunov static int noop_apic_id_registered(void) 779844ab11SCyrill Gorcunov { 78f88f2b4fSCyrill Gorcunov /* 79f88f2b4fSCyrill Gorcunov * if we would be really "pedantic" 80f88f2b4fSCyrill Gorcunov * we should pass read_apic_id() here 81f88f2b4fSCyrill Gorcunov * but since NOOP suppose APIC ID = 0 82f88f2b4fSCyrill Gorcunov * lets save a few cycles 83f88f2b4fSCyrill Gorcunov */ 84f88f2b4fSCyrill Gorcunov return physid_isset(0, phys_cpu_present_map); 859844ab11SCyrill Gorcunov } 869844ab11SCyrill Gorcunov 879844ab11SCyrill Gorcunov static const struct cpumask *noop_target_cpus(void) 889844ab11SCyrill Gorcunov { 899844ab11SCyrill Gorcunov /* only BSP here */ 909844ab11SCyrill Gorcunov return cpumask_of(0); 919844ab11SCyrill Gorcunov } 929844ab11SCyrill Gorcunov 931ac322d0SSuresh Siddha static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask, 941ac322d0SSuresh Siddha const struct cpumask *mask) 959844ab11SCyrill Gorcunov { 969844ab11SCyrill Gorcunov if (cpu != 0) 979844ab11SCyrill Gorcunov pr_warning("APIC: Vector allocated for non-BSP cpu\n"); 989d8e1066SAlexander Gordeev cpumask_copy(retmask, cpumask_of(cpu)); 999844ab11SCyrill Gorcunov } 1009844ab11SCyrill Gorcunov 1019844ab11SCyrill Gorcunov static u32 noop_apic_read(u32 reg) 1029844ab11SCyrill Gorcunov { 1039844ab11SCyrill Gorcunov WARN_ON_ONCE((cpu_has_apic && !disable_apic)); 1049844ab11SCyrill Gorcunov return 0; 1059844ab11SCyrill Gorcunov } 1069844ab11SCyrill Gorcunov 107f88f2b4fSCyrill Gorcunov static void noop_apic_write(u32 reg, u32 v) 108f88f2b4fSCyrill Gorcunov { 109a946d8f1SThomas Gleixner WARN_ON_ONCE(cpu_has_apic && !disable_apic); 110f88f2b4fSCyrill Gorcunov } 111f88f2b4fSCyrill Gorcunov 1129844ab11SCyrill Gorcunov struct apic apic_noop = { 1139844ab11SCyrill Gorcunov .name = "noop", 1149844ab11SCyrill Gorcunov .probe = noop_probe, 1159844ab11SCyrill Gorcunov .acpi_madt_oem_check = NULL, 1169844ab11SCyrill Gorcunov 117fa63030eSDaniel J Blueman .apic_id_valid = default_apic_id_valid, 1189844ab11SCyrill Gorcunov .apic_id_registered = noop_apic_id_registered, 1199844ab11SCyrill Gorcunov 1209844ab11SCyrill Gorcunov .irq_delivery_mode = dest_LowestPrio, 1219844ab11SCyrill Gorcunov /* logical delivery broadcast to all CPUs: */ 1229844ab11SCyrill Gorcunov .irq_dest_mode = 1, 1239844ab11SCyrill Gorcunov 1249844ab11SCyrill Gorcunov .target_cpus = noop_target_cpus, 1259844ab11SCyrill Gorcunov .disable_esr = 0, 1269844ab11SCyrill Gorcunov .dest_logical = APIC_DEST_LOGICAL, 1274c59f3e6SDavid Rientjes .check_apicid_used = default_check_apicid_used, 1289844ab11SCyrill Gorcunov 1299844ab11SCyrill Gorcunov .vector_allocation_domain = noop_vector_allocation_domain, 1309844ab11SCyrill Gorcunov .init_apic_ldr = noop_init_apic_ldr, 1319844ab11SCyrill Gorcunov 1327abc0753SCyrill Gorcunov .ioapic_phys_id_map = default_ioapic_phys_id_map, 1339844ab11SCyrill Gorcunov .setup_apic_routing = NULL, 1349844ab11SCyrill Gorcunov 1359844ab11SCyrill Gorcunov .cpu_present_to_apicid = default_cpu_present_to_apicid, 1367abc0753SCyrill Gorcunov .apicid_to_cpu_present = physid_set_mask_of_physid, 1379844ab11SCyrill Gorcunov 1389844ab11SCyrill Gorcunov .check_phys_apicid_present = default_check_phys_apicid_present, 1399844ab11SCyrill Gorcunov 140f88f2b4fSCyrill Gorcunov .phys_pkg_id = noop_phys_pkg_id, 1419844ab11SCyrill Gorcunov 1429844ab11SCyrill Gorcunov .get_apic_id = noop_get_apic_id, 1439844ab11SCyrill Gorcunov .set_apic_id = NULL, 1449844ab11SCyrill Gorcunov .apic_id_mask = 0x0F << 24, 1459844ab11SCyrill Gorcunov 1466398268dSAlexander Gordeev .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and, 1479844ab11SCyrill Gorcunov 1484727da2eSThomas Gleixner .send_IPI = noop_send_IPI, 1499844ab11SCyrill Gorcunov .send_IPI_mask = noop_send_IPI_mask, 1509844ab11SCyrill Gorcunov .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself, 1519844ab11SCyrill Gorcunov .send_IPI_allbutself = noop_send_IPI_allbutself, 1529844ab11SCyrill Gorcunov .send_IPI_all = noop_send_IPI_all, 1539844ab11SCyrill Gorcunov .send_IPI_self = noop_send_IPI_self, 1549844ab11SCyrill Gorcunov 1559844ab11SCyrill Gorcunov .wakeup_secondary_cpu = noop_wakeup_secondary_cpu, 1569844ab11SCyrill Gorcunov 1579844ab11SCyrill Gorcunov .inquire_remote_apic = NULL, 1589844ab11SCyrill Gorcunov 1599844ab11SCyrill Gorcunov .read = noop_apic_read, 1609844ab11SCyrill Gorcunov .write = noop_apic_write, 1612a43195dSMichael S. Tsirkin .eoi_write = noop_apic_write, 1629844ab11SCyrill Gorcunov .icr_read = noop_apic_icr_read, 1639844ab11SCyrill Gorcunov .icr_write = noop_apic_icr_write, 1649844ab11SCyrill Gorcunov .wait_icr_idle = noop_apic_wait_icr_idle, 1659844ab11SCyrill Gorcunov .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle, 166acb8bc09STejun Heo 167acb8bc09STejun Heo #ifdef CONFIG_X86_32 168acb8bc09STejun Heo .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid, 169acb8bc09STejun Heo #endif 1709844ab11SCyrill Gorcunov }; 171