Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 1 | /* |
| 2 | * NOOP APIC driver. |
| 3 | * |
| 4 | * Does almost nothing and should be substituted by a real apic driver via |
| 5 | * probe routine. |
| 6 | * |
| 7 | * Though in case if apic is disabled (for some reason) we try |
| 8 | * to not uglify the caller's code and allow to call (some) apic routines |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 9 | * like self-ipi, etc... |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/threads.h> |
| 13 | #include <linux/cpumask.h> |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 14 | #include <linux/string.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/ctype.h> |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 17 | #include <linux/errno.h> |
| 18 | #include <asm/fixmap.h> |
| 19 | #include <asm/mpspec.h> |
| 20 | #include <asm/apicdef.h> |
| 21 | #include <asm/apic.h> |
| 22 | #include <asm/setup.h> |
| 23 | |
| 24 | #include <linux/smp.h> |
| 25 | #include <asm/ipi.h> |
| 26 | |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <asm/acpi.h> |
Ingo Molnar | 66441bd | 2017-01-27 10:27:10 +0100 | [diff] [blame] | 29 | #include <asm/e820/api.h> |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 30 | |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 31 | static void noop_init_apic_ldr(void) { } |
Thomas Gleixner | 4727da2 | 2015-11-04 22:57:06 +0000 | [diff] [blame] | 32 | static void noop_send_IPI(int cpu, int vector) { } |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 33 | static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { } |
| 34 | static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { } |
| 35 | static void noop_send_IPI_allbutself(int vector) { } |
| 36 | static void noop_send_IPI_all(int vector) { } |
| 37 | static void noop_send_IPI_self(int vector) { } |
| 38 | static void noop_apic_wait_icr_idle(void) { } |
| 39 | static void noop_apic_icr_write(u32 low, u32 id) { } |
| 40 | |
| 41 | static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip) |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 42 | { |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 43 | return -1; |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 44 | } |
| 45 | |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 46 | static u32 noop_safe_apic_wait_icr_idle(void) |
| 47 | { |
| 48 | return 0; |
| 49 | } |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 50 | |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 51 | static u64 noop_apic_icr_read(void) |
| 52 | { |
| 53 | return 0; |
| 54 | } |
| 55 | |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 56 | static int noop_phys_pkg_id(int cpuid_apic, int index_msb) |
| 57 | { |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static unsigned int noop_get_apic_id(unsigned long x) |
| 62 | { |
| 63 | return 0; |
| 64 | } |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 65 | |
| 66 | static int noop_probe(void) |
| 67 | { |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 68 | /* |
| 69 | * NOOP apic should not ever be |
| 70 | * enabled via probe routine |
| 71 | */ |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int noop_apic_id_registered(void) |
| 76 | { |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 77 | /* |
| 78 | * if we would be really "pedantic" |
| 79 | * we should pass read_apic_id() here |
| 80 | * but since NOOP suppose APIC ID = 0 |
| 81 | * lets save a few cycles |
| 82 | */ |
| 83 | return physid_isset(0, phys_cpu_present_map); |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static const struct cpumask *noop_target_cpus(void) |
| 87 | { |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 88 | /* only BSP here */ |
| 89 | return cpumask_of(0); |
| 90 | } |
| 91 | |
Suresh Siddha | 1ac322d | 2012-06-25 13:38:28 -0700 | [diff] [blame] | 92 | static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask, |
| 93 | const struct cpumask *mask) |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 94 | { |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 95 | if (cpu != 0) |
| 96 | pr_warning("APIC: Vector allocated for non-BSP cpu\n"); |
Alexander Gordeev | 9d8e106 | 2012-06-07 15:14:49 +0200 | [diff] [blame] | 97 | cpumask_copy(retmask, cpumask_of(cpu)); |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 98 | } |
| 99 | |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 100 | static u32 noop_apic_read(u32 reg) |
| 101 | { |
Borislav Petkov | 93984fb | 2016-04-04 22:25:00 +0200 | [diff] [blame] | 102 | WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic); |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 103 | return 0; |
| 104 | } |
| 105 | |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 106 | static void noop_apic_write(u32 reg, u32 v) |
| 107 | { |
Borislav Petkov | 93984fb | 2016-04-04 22:25:00 +0200 | [diff] [blame] | 108 | WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic); |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 109 | } |
| 110 | |
Kees Cook | 404f6aa | 2016-08-08 16:29:06 -0700 | [diff] [blame] | 111 | struct apic apic_noop __ro_after_init = { |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 112 | .name = "noop", |
| 113 | .probe = noop_probe, |
| 114 | .acpi_madt_oem_check = NULL, |
| 115 | |
Daniel J Blueman | fa63030 | 2012-03-14 15:17:34 +0800 | [diff] [blame] | 116 | .apic_id_valid = default_apic_id_valid, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 117 | .apic_id_registered = noop_apic_id_registered, |
| 118 | |
| 119 | .irq_delivery_mode = dest_LowestPrio, |
| 120 | /* logical delivery broadcast to all CPUs: */ |
| 121 | .irq_dest_mode = 1, |
| 122 | |
| 123 | .target_cpus = noop_target_cpus, |
| 124 | .disable_esr = 0, |
| 125 | .dest_logical = APIC_DEST_LOGICAL, |
David Rientjes | 4c59f3e | 2014-07-30 23:53:40 -0700 | [diff] [blame] | 126 | .check_apicid_used = default_check_apicid_used, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 127 | |
| 128 | .vector_allocation_domain = noop_vector_allocation_domain, |
| 129 | .init_apic_ldr = noop_init_apic_ldr, |
| 130 | |
Cyrill Gorcunov | 7abc075 | 2009-11-10 01:06:59 +0300 | [diff] [blame] | 131 | .ioapic_phys_id_map = default_ioapic_phys_id_map, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 132 | .setup_apic_routing = NULL, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 133 | |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 134 | .cpu_present_to_apicid = default_cpu_present_to_apicid, |
Cyrill Gorcunov | 7abc075 | 2009-11-10 01:06:59 +0300 | [diff] [blame] | 135 | .apicid_to_cpu_present = physid_set_mask_of_physid, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 136 | |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 137 | .check_phys_apicid_present = default_check_phys_apicid_present, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 138 | |
Cyrill Gorcunov | f88f2b4 | 2009-10-15 19:04:16 +0400 | [diff] [blame] | 139 | .phys_pkg_id = noop_phys_pkg_id, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 140 | |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 141 | .get_apic_id = noop_get_apic_id, |
| 142 | .set_apic_id = NULL, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 143 | |
Thomas Gleixner | 91cd9cb | 2017-06-20 01:37:43 +0200 | [diff] [blame] | 144 | .cpu_mask_to_apicid = flat_cpu_mask_to_apicid, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 145 | |
Thomas Gleixner | 4727da2 | 2015-11-04 22:57:06 +0000 | [diff] [blame] | 146 | .send_IPI = noop_send_IPI, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 147 | .send_IPI_mask = noop_send_IPI_mask, |
| 148 | .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself, |
| 149 | .send_IPI_allbutself = noop_send_IPI_allbutself, |
| 150 | .send_IPI_all = noop_send_IPI_all, |
| 151 | .send_IPI_self = noop_send_IPI_self, |
| 152 | |
| 153 | .wakeup_secondary_cpu = noop_wakeup_secondary_cpu, |
| 154 | |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 155 | .inquire_remote_apic = NULL, |
| 156 | |
| 157 | .read = noop_apic_read, |
| 158 | .write = noop_apic_write, |
Michael S. Tsirkin | 2a43195 | 2012-05-16 19:03:52 +0300 | [diff] [blame] | 159 | .eoi_write = noop_apic_write, |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 160 | .icr_read = noop_apic_icr_read, |
| 161 | .icr_write = noop_apic_icr_write, |
| 162 | .wait_icr_idle = noop_apic_wait_icr_idle, |
| 163 | .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle, |
Tejun Heo | acb8bc0 | 2011-01-23 14:37:33 +0100 | [diff] [blame] | 164 | |
| 165 | #ifdef CONFIG_X86_32 |
| 166 | .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid, |
| 167 | #endif |
Cyrill Gorcunov | 9844ab1 | 2009-10-14 00:07:03 +0400 | [diff] [blame] | 168 | }; |