1f62bae50SIngo Molnar /* 2f62bae50SIngo Molnar * Local APIC handling, local APIC timers 3f62bae50SIngo Molnar * 4f62bae50SIngo Molnar * (c) 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com> 5f62bae50SIngo Molnar * 6f62bae50SIngo Molnar * Fixes 7f62bae50SIngo Molnar * Maciej W. Rozycki : Bits for genuine 82489DX APICs; 8f62bae50SIngo Molnar * thanks to Eric Gilmore 9f62bae50SIngo Molnar * and Rolf G. Tews 10f62bae50SIngo Molnar * for testing these extensively. 11f62bae50SIngo Molnar * Maciej W. Rozycki : Various updates and fixes. 12f62bae50SIngo Molnar * Mikael Pettersson : Power Management for UP-APIC. 13f62bae50SIngo Molnar * Pavel Machek and 14f62bae50SIngo Molnar * Mikael Pettersson : PM converted to driver model. 15f62bae50SIngo Molnar */ 16f62bae50SIngo Molnar 17cdd6c482SIngo Molnar #include <linux/perf_event.h> 18f62bae50SIngo Molnar #include <linux/kernel_stat.h> 19f62bae50SIngo Molnar #include <linux/mc146818rtc.h> 20f62bae50SIngo Molnar #include <linux/acpi_pmtmr.h> 21f62bae50SIngo Molnar #include <linux/clockchips.h> 22f62bae50SIngo Molnar #include <linux/interrupt.h> 23f62bae50SIngo Molnar #include <linux/bootmem.h> 24f62bae50SIngo Molnar #include <linux/ftrace.h> 25f62bae50SIngo Molnar #include <linux/ioport.h> 26f62bae50SIngo Molnar #include <linux/module.h> 27f3c6ea1bSRafael J. Wysocki #include <linux/syscore_ops.h> 28f62bae50SIngo Molnar #include <linux/delay.h> 29f62bae50SIngo Molnar #include <linux/timex.h> 30334955efSRalf Baechle #include <linux/i8253.h> 31f62bae50SIngo Molnar #include <linux/dmar.h> 32f62bae50SIngo Molnar #include <linux/init.h> 33f62bae50SIngo Molnar #include <linux/cpu.h> 34f62bae50SIngo Molnar #include <linux/dmi.h> 35f62bae50SIngo Molnar #include <linux/smp.h> 36f62bae50SIngo Molnar #include <linux/mm.h> 37f62bae50SIngo Molnar 3883ab8514SSteven Rostedt (Red Hat) #include <asm/trace/irq_vectors.h> 398a8f422dSSuresh Siddha #include <asm/irq_remapping.h> 40cdd6c482SIngo Molnar #include <asm/perf_event.h> 41736decacSThomas Gleixner #include <asm/x86_init.h> 42f62bae50SIngo Molnar #include <asm/pgalloc.h> 4360063497SArun Sharma #include <linux/atomic.h> 44f62bae50SIngo Molnar #include <asm/mpspec.h> 45f62bae50SIngo Molnar #include <asm/i8259.h> 46f62bae50SIngo Molnar #include <asm/proto.h> 47f62bae50SIngo Molnar #include <asm/apic.h> 487167d08eSHenrik Kretzschmar #include <asm/io_apic.h> 49f62bae50SIngo Molnar #include <asm/desc.h> 50f62bae50SIngo Molnar #include <asm/hpet.h> 51f62bae50SIngo Molnar #include <asm/idle.h> 52f62bae50SIngo Molnar #include <asm/mtrr.h> 5316f871bcSRalf Baechle #include <asm/time.h> 54f62bae50SIngo Molnar #include <asm/smp.h> 55638bee71SH. Peter Anvin #include <asm/mce.h> 568c3ba8d0SKerstin Jonsson #include <asm/tsc.h> 572904ed8dSSheng Yang #include <asm/hypervisor.h> 58f62bae50SIngo Molnar 59f62bae50SIngo Molnar unsigned int num_processors; 60f62bae50SIngo Molnar 61148f9bb8SPaul Gortmaker unsigned disabled_cpus; 62f62bae50SIngo Molnar 63f62bae50SIngo Molnar /* Processor that is doing the boot up */ 64f62bae50SIngo Molnar unsigned int boot_cpu_physical_apicid = -1U; 65cc08e04cSDavid Rientjes EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid); 66f62bae50SIngo Molnar 67f62bae50SIngo Molnar /* 68f62bae50SIngo Molnar * The highest APIC ID seen during enumeration. 69f62bae50SIngo Molnar */ 70a491cc90SJiang Liu static unsigned int max_physical_apicid; 71f62bae50SIngo Molnar 72f62bae50SIngo Molnar /* 73f62bae50SIngo Molnar * Bitmask of physically existing CPUs: 74f62bae50SIngo Molnar */ 75f62bae50SIngo Molnar physid_mask_t phys_cpu_present_map; 76f62bae50SIngo Molnar 77f62bae50SIngo Molnar /* 78151e0c7dSHATAYAMA Daisuke * Processor to be disabled specified by kernel parameter 79151e0c7dSHATAYAMA Daisuke * disable_cpu_apicid=<int>, mostly used for the kdump 2nd kernel to 80151e0c7dSHATAYAMA Daisuke * avoid undefined behaviour caused by sending INIT from AP to BSP. 81151e0c7dSHATAYAMA Daisuke */ 825b4d1dbcSH. Peter Anvin static unsigned int disabled_cpu_apicid __read_mostly = BAD_APICID; 83151e0c7dSHATAYAMA Daisuke 84151e0c7dSHATAYAMA Daisuke /* 85f62bae50SIngo Molnar * Map cpu index to physical APIC ID 86f62bae50SIngo Molnar */ 870816b0f0SVlad Zolotarov DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid, BAD_APICID); 880816b0f0SVlad Zolotarov DEFINE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid, BAD_APICID); 89f62bae50SIngo Molnar EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); 90f62bae50SIngo Molnar EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); 91f62bae50SIngo Molnar 92f62bae50SIngo Molnar #ifdef CONFIG_X86_32 934c321ff8STejun Heo 944c321ff8STejun Heo /* 954c321ff8STejun Heo * On x86_32, the mapping between cpu and logical apicid may vary 964c321ff8STejun Heo * depending on apic in use. The following early percpu variable is 974c321ff8STejun Heo * used for the mapping. This is where the behaviors of x86_64 and 32 984c321ff8STejun Heo * actually diverge. Let's keep it ugly for now. 994c321ff8STejun Heo */ 1000816b0f0SVlad Zolotarov DEFINE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid, BAD_APICID); 1014c321ff8STejun Heo 102f62bae50SIngo Molnar /* Local APIC was disabled by the BIOS and enabled by the kernel */ 103f62bae50SIngo Molnar static int enabled_via_apicbase; 104f62bae50SIngo Molnar 105c0eaa453SCyrill Gorcunov /* 106c0eaa453SCyrill Gorcunov * Handle interrupt mode configuration register (IMCR). 107c0eaa453SCyrill Gorcunov * This register controls whether the interrupt signals 108c0eaa453SCyrill Gorcunov * that reach the BSP come from the master PIC or from the 109c0eaa453SCyrill Gorcunov * local APIC. Before entering Symmetric I/O Mode, either 110c0eaa453SCyrill Gorcunov * the BIOS or the operating system must switch out of 111c0eaa453SCyrill Gorcunov * PIC Mode by changing the IMCR. 112c0eaa453SCyrill Gorcunov */ 1135cda395fSAlexander van Heukelum static inline void imcr_pic_to_apic(void) 114c0eaa453SCyrill Gorcunov { 115c0eaa453SCyrill Gorcunov /* select IMCR register */ 116c0eaa453SCyrill Gorcunov outb(0x70, 0x22); 117c0eaa453SCyrill Gorcunov /* NMI and 8259 INTR go through APIC */ 118c0eaa453SCyrill Gorcunov outb(0x01, 0x23); 119c0eaa453SCyrill Gorcunov } 120c0eaa453SCyrill Gorcunov 1215cda395fSAlexander van Heukelum static inline void imcr_apic_to_pic(void) 122c0eaa453SCyrill Gorcunov { 123c0eaa453SCyrill Gorcunov /* select IMCR register */ 124c0eaa453SCyrill Gorcunov outb(0x70, 0x22); 125c0eaa453SCyrill Gorcunov /* NMI and 8259 INTR go directly to BSP */ 126c0eaa453SCyrill Gorcunov outb(0x00, 0x23); 127c0eaa453SCyrill Gorcunov } 128f62bae50SIngo Molnar #endif 129f62bae50SIngo Molnar 130279f1461SSuresh Siddha /* 131279f1461SSuresh Siddha * Knob to control our willingness to enable the local APIC. 132279f1461SSuresh Siddha * 133279f1461SSuresh Siddha * +1=force-enable 134279f1461SSuresh Siddha */ 135279f1461SSuresh Siddha static int force_enable_local_apic __initdata; 136dc9788f4SDavid Rientjes 137dc9788f4SDavid Rientjes /* Control whether x2APIC mode is enabled or not */ 138dc9788f4SDavid Rientjes static bool nox2apic __initdata; 139dc9788f4SDavid Rientjes 140279f1461SSuresh Siddha /* 141279f1461SSuresh Siddha * APIC command line parameters 142279f1461SSuresh Siddha */ 143279f1461SSuresh Siddha static int __init parse_lapic(char *arg) 144279f1461SSuresh Siddha { 145279f1461SSuresh Siddha if (config_enabled(CONFIG_X86_32) && !arg) 146279f1461SSuresh Siddha force_enable_local_apic = 1; 14727cf9298SMathias Krause else if (arg && !strncmp(arg, "notscdeadline", 13)) 148279f1461SSuresh Siddha setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER); 149279f1461SSuresh Siddha return 0; 150279f1461SSuresh Siddha } 151279f1461SSuresh Siddha early_param("lapic", parse_lapic); 152279f1461SSuresh Siddha 153f62bae50SIngo Molnar #ifdef CONFIG_X86_64 154f62bae50SIngo Molnar static int apic_calibrate_pmtmr __initdata; 155f62bae50SIngo Molnar static __init int setup_apicpmtimer(char *s) 156f62bae50SIngo Molnar { 157f62bae50SIngo Molnar apic_calibrate_pmtmr = 1; 158f62bae50SIngo Molnar notsc_setup(NULL); 159f62bae50SIngo Molnar return 0; 160f62bae50SIngo Molnar } 161f62bae50SIngo Molnar __setup("apicpmtimer", setup_apicpmtimer); 162f62bae50SIngo Molnar #endif 163f62bae50SIngo Molnar 164fc1edaf9SSuresh Siddha int x2apic_mode; 165f62bae50SIngo Molnar #ifdef CONFIG_X86_X2APIC 166f62bae50SIngo Molnar /* x2apic enabled before OS handover */ 167fb209bd8SYinghai Lu int x2apic_preenabled; 168fb209bd8SYinghai Lu static int x2apic_disabled; 169dc9788f4SDavid Rientjes static int __init setup_nox2apic(char *str) 170f62bae50SIngo Molnar { 17139d83a5dSSuresh Siddha if (x2apic_enabled()) { 172a31bc327SYinghai Lu int apicid = native_apic_msr_read(APIC_ID); 173a31bc327SYinghai Lu 174a31bc327SYinghai Lu if (apicid >= 255) { 175a31bc327SYinghai Lu pr_warning("Apicid: %08x, cannot enforce nox2apic\n", 176a31bc327SYinghai Lu apicid); 17739d83a5dSSuresh Siddha return 0; 17839d83a5dSSuresh Siddha } 17939d83a5dSSuresh Siddha 180a31bc327SYinghai Lu pr_warning("x2apic already enabled. will disable it\n"); 181a31bc327SYinghai Lu } else 182f62bae50SIngo Molnar setup_clear_cpu_cap(X86_FEATURE_X2APIC); 183a31bc327SYinghai Lu 184dc9788f4SDavid Rientjes nox2apic = true; 185a31bc327SYinghai Lu 186f62bae50SIngo Molnar return 0; 187f62bae50SIngo Molnar } 188f62bae50SIngo Molnar early_param("nox2apic", setup_nox2apic); 189f62bae50SIngo Molnar #endif 190f62bae50SIngo Molnar 191f62bae50SIngo Molnar unsigned long mp_lapic_addr; 192f62bae50SIngo Molnar int disable_apic; 193f62bae50SIngo Molnar /* Disable local APIC timer from the kernel commandline or via dmi quirk */ 19425874a29SHenrik Kretzschmar static int disable_apic_timer __initdata; 195f62bae50SIngo Molnar /* Local APIC timer works in C2 */ 196f62bae50SIngo Molnar int local_apic_timer_c2_ok; 197f62bae50SIngo Molnar EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); 198f62bae50SIngo Molnar 1992414e021SJan Beulich int first_system_vector = FIRST_SYSTEM_VECTOR; 200f62bae50SIngo Molnar 201f62bae50SIngo Molnar /* 202f62bae50SIngo Molnar * Debug level, exported for io_apic.c 203f62bae50SIngo Molnar */ 204f62bae50SIngo Molnar unsigned int apic_verbosity; 205f62bae50SIngo Molnar 206f62bae50SIngo Molnar int pic_mode; 207f62bae50SIngo Molnar 208f62bae50SIngo Molnar /* Have we found an MP table */ 209f62bae50SIngo Molnar int smp_found_config; 210f62bae50SIngo Molnar 211f62bae50SIngo Molnar static struct resource lapic_resource = { 212f62bae50SIngo Molnar .name = "Local APIC", 213f62bae50SIngo Molnar .flags = IORESOURCE_MEM | IORESOURCE_BUSY, 214f62bae50SIngo Molnar }; 215f62bae50SIngo Molnar 2161ade93efSJacob Pan unsigned int lapic_timer_frequency = 0; 217f62bae50SIngo Molnar 218f62bae50SIngo Molnar static void apic_pm_activate(void); 219f62bae50SIngo Molnar 220f62bae50SIngo Molnar static unsigned long apic_phys; 221f62bae50SIngo Molnar 222f62bae50SIngo Molnar /* 223f62bae50SIngo Molnar * Get the LAPIC version 224f62bae50SIngo Molnar */ 225f62bae50SIngo Molnar static inline int lapic_get_version(void) 226f62bae50SIngo Molnar { 227f62bae50SIngo Molnar return GET_APIC_VERSION(apic_read(APIC_LVR)); 228f62bae50SIngo Molnar } 229f62bae50SIngo Molnar 230f62bae50SIngo Molnar /* 231f62bae50SIngo Molnar * Check, if the APIC is integrated or a separate chip 232f62bae50SIngo Molnar */ 233f62bae50SIngo Molnar static inline int lapic_is_integrated(void) 234f62bae50SIngo Molnar { 235f62bae50SIngo Molnar #ifdef CONFIG_X86_64 236f62bae50SIngo Molnar return 1; 237f62bae50SIngo Molnar #else 238f62bae50SIngo Molnar return APIC_INTEGRATED(lapic_get_version()); 239f62bae50SIngo Molnar #endif 240f62bae50SIngo Molnar } 241f62bae50SIngo Molnar 242f62bae50SIngo Molnar /* 243f62bae50SIngo Molnar * Check, whether this is a modern or a first generation APIC 244f62bae50SIngo Molnar */ 245f62bae50SIngo Molnar static int modern_apic(void) 246f62bae50SIngo Molnar { 247f62bae50SIngo Molnar /* AMD systems use old APIC versions, so check the CPU */ 248f62bae50SIngo Molnar if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && 249f62bae50SIngo Molnar boot_cpu_data.x86 >= 0xf) 250f62bae50SIngo Molnar return 1; 251f62bae50SIngo Molnar return lapic_get_version() >= 0x14; 252f62bae50SIngo Molnar } 253f62bae50SIngo Molnar 25408306ce6SCyrill Gorcunov /* 255a933c618SCyrill Gorcunov * right after this call apic become NOOP driven 256a933c618SCyrill Gorcunov * so apic->write/read doesn't do anything 25708306ce6SCyrill Gorcunov */ 25825874a29SHenrik Kretzschmar static void __init apic_disable(void) 25908306ce6SCyrill Gorcunov { 260f88f2b4fSCyrill Gorcunov pr_info("APIC: switched to apic NOOP\n"); 261a933c618SCyrill Gorcunov apic = &apic_noop; 26208306ce6SCyrill Gorcunov } 26308306ce6SCyrill Gorcunov 264f62bae50SIngo Molnar void native_apic_wait_icr_idle(void) 265f62bae50SIngo Molnar { 266f62bae50SIngo Molnar while (apic_read(APIC_ICR) & APIC_ICR_BUSY) 267f62bae50SIngo Molnar cpu_relax(); 268f62bae50SIngo Molnar } 269f62bae50SIngo Molnar 270f62bae50SIngo Molnar u32 native_safe_apic_wait_icr_idle(void) 271f62bae50SIngo Molnar { 272f62bae50SIngo Molnar u32 send_status; 273f62bae50SIngo Molnar int timeout; 274f62bae50SIngo Molnar 275f62bae50SIngo Molnar timeout = 0; 276f62bae50SIngo Molnar do { 277f62bae50SIngo Molnar send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; 278f62bae50SIngo Molnar if (!send_status) 279f62bae50SIngo Molnar break; 280b49d7d87SFernando Luis Vazquez Cao inc_irq_stat(icr_read_retry_count); 281f62bae50SIngo Molnar udelay(100); 282f62bae50SIngo Molnar } while (timeout++ < 1000); 283f62bae50SIngo Molnar 284f62bae50SIngo Molnar return send_status; 285f62bae50SIngo Molnar } 286f62bae50SIngo Molnar 287f62bae50SIngo Molnar void native_apic_icr_write(u32 low, u32 id) 288f62bae50SIngo Molnar { 289ea7bdc65SJan Kiszka unsigned long flags; 290ea7bdc65SJan Kiszka 291ea7bdc65SJan Kiszka local_irq_save(flags); 292f62bae50SIngo Molnar apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); 293f62bae50SIngo Molnar apic_write(APIC_ICR, low); 294ea7bdc65SJan Kiszka local_irq_restore(flags); 295f62bae50SIngo Molnar } 296f62bae50SIngo Molnar 297f62bae50SIngo Molnar u64 native_apic_icr_read(void) 298f62bae50SIngo Molnar { 299f62bae50SIngo Molnar u32 icr1, icr2; 300f62bae50SIngo Molnar 301f62bae50SIngo Molnar icr2 = apic_read(APIC_ICR2); 302f62bae50SIngo Molnar icr1 = apic_read(APIC_ICR); 303f62bae50SIngo Molnar 304f62bae50SIngo Molnar return icr1 | ((u64)icr2 << 32); 305f62bae50SIngo Molnar } 306f62bae50SIngo Molnar 307f62bae50SIngo Molnar #ifdef CONFIG_X86_32 308f62bae50SIngo Molnar /** 309f62bae50SIngo Molnar * get_physical_broadcast - Get number of physical broadcast IDs 310f62bae50SIngo Molnar */ 311f62bae50SIngo Molnar int get_physical_broadcast(void) 312f62bae50SIngo Molnar { 313f62bae50SIngo Molnar return modern_apic() ? 0xff : 0xf; 314f62bae50SIngo Molnar } 315f62bae50SIngo Molnar #endif 316f62bae50SIngo Molnar 317f62bae50SIngo Molnar /** 318f62bae50SIngo Molnar * lapic_get_maxlvt - get the maximum number of local vector table entries 319f62bae50SIngo Molnar */ 320f62bae50SIngo Molnar int lapic_get_maxlvt(void) 321f62bae50SIngo Molnar { 322f62bae50SIngo Molnar unsigned int v; 323f62bae50SIngo Molnar 324f62bae50SIngo Molnar v = apic_read(APIC_LVR); 325f62bae50SIngo Molnar /* 326f62bae50SIngo Molnar * - we always have APIC integrated on 64bit mode 327f62bae50SIngo Molnar * - 82489DXs do not report # of LVT entries 328f62bae50SIngo Molnar */ 329f62bae50SIngo Molnar return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; 330f62bae50SIngo Molnar } 331f62bae50SIngo Molnar 332f62bae50SIngo Molnar /* 333f62bae50SIngo Molnar * Local APIC timer 334f62bae50SIngo Molnar */ 335f62bae50SIngo Molnar 336f62bae50SIngo Molnar /* Clock divisor */ 337f62bae50SIngo Molnar #define APIC_DIVISOR 16 338279f1461SSuresh Siddha #define TSC_DIVISOR 32 339f62bae50SIngo Molnar 340f62bae50SIngo Molnar /* 341f62bae50SIngo Molnar * This function sets up the local APIC timer, with a timeout of 342f62bae50SIngo Molnar * 'clocks' APIC bus clock. During calibration we actually call 343f62bae50SIngo Molnar * this function twice on the boot CPU, once with a bogus timeout 344f62bae50SIngo Molnar * value, second time for real. The other (noncalibrating) CPUs 345f62bae50SIngo Molnar * call this function only once, with the real, calibrated value. 346f62bae50SIngo Molnar * 347f62bae50SIngo Molnar * We do reads before writes even if unnecessary, to get around the 348f62bae50SIngo Molnar * P5 APIC double write bug. 349f62bae50SIngo Molnar */ 350f62bae50SIngo Molnar static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) 351f62bae50SIngo Molnar { 352f62bae50SIngo Molnar unsigned int lvtt_value, tmp_value; 353f62bae50SIngo Molnar 354f62bae50SIngo Molnar lvtt_value = LOCAL_TIMER_VECTOR; 355f62bae50SIngo Molnar if (!oneshot) 356f62bae50SIngo Molnar lvtt_value |= APIC_LVT_TIMER_PERIODIC; 357279f1461SSuresh Siddha else if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) 358279f1461SSuresh Siddha lvtt_value |= APIC_LVT_TIMER_TSCDEADLINE; 359279f1461SSuresh Siddha 360f62bae50SIngo Molnar if (!lapic_is_integrated()) 361f62bae50SIngo Molnar lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); 362f62bae50SIngo Molnar 363f62bae50SIngo Molnar if (!irqen) 364f62bae50SIngo Molnar lvtt_value |= APIC_LVT_MASKED; 365f62bae50SIngo Molnar 366f62bae50SIngo Molnar apic_write(APIC_LVTT, lvtt_value); 367f62bae50SIngo Molnar 368279f1461SSuresh Siddha if (lvtt_value & APIC_LVT_TIMER_TSCDEADLINE) { 369279f1461SSuresh Siddha printk_once(KERN_DEBUG "TSC deadline timer enabled\n"); 370279f1461SSuresh Siddha return; 371279f1461SSuresh Siddha } 372279f1461SSuresh Siddha 373f62bae50SIngo Molnar /* 374f62bae50SIngo Molnar * Divide PICLK by 16 375f62bae50SIngo Molnar */ 376f62bae50SIngo Molnar tmp_value = apic_read(APIC_TDCR); 377f62bae50SIngo Molnar apic_write(APIC_TDCR, 378f62bae50SIngo Molnar (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | 379f62bae50SIngo Molnar APIC_TDR_DIV_16); 380f62bae50SIngo Molnar 381f62bae50SIngo Molnar if (!oneshot) 382f62bae50SIngo Molnar apic_write(APIC_TMICT, clocks / APIC_DIVISOR); 383f62bae50SIngo Molnar } 384f62bae50SIngo Molnar 385f62bae50SIngo Molnar /* 386a68c439bSRobert Richter * Setup extended LVT, AMD specific 387f62bae50SIngo Molnar * 388a68c439bSRobert Richter * Software should use the LVT offsets the BIOS provides. The offsets 389a68c439bSRobert Richter * are determined by the subsystems using it like those for MCE 390a68c439bSRobert Richter * threshold or IBS. On K8 only offset 0 (APIC500) and MCE interrupts 391a68c439bSRobert Richter * are supported. Beginning with family 10h at least 4 offsets are 392a68c439bSRobert Richter * available. 393f62bae50SIngo Molnar * 394a68c439bSRobert Richter * Since the offsets must be consistent for all cores, we keep track 395a68c439bSRobert Richter * of the LVT offsets in software and reserve the offset for the same 396a68c439bSRobert Richter * vector also to be used on other cores. An offset is freed by 397a68c439bSRobert Richter * setting the entry to APIC_EILVT_MASKED. 398a68c439bSRobert Richter * 399a68c439bSRobert Richter * If the BIOS is right, there should be no conflicts. Otherwise a 400a68c439bSRobert Richter * "[Firmware Bug]: ..." error message is generated. However, if 401a68c439bSRobert Richter * software does not properly determines the offsets, it is not 402a68c439bSRobert Richter * necessarily a BIOS bug. 403f62bae50SIngo Molnar */ 404f62bae50SIngo Molnar 405a68c439bSRobert Richter static atomic_t eilvt_offsets[APIC_EILVT_NR_MAX]; 406f62bae50SIngo Molnar 407a68c439bSRobert Richter static inline int eilvt_entry_is_changeable(unsigned int old, unsigned int new) 408a68c439bSRobert Richter { 409a68c439bSRobert Richter return (old & APIC_EILVT_MASKED) 410a68c439bSRobert Richter || (new == APIC_EILVT_MASKED) 411a68c439bSRobert Richter || ((new & ~APIC_EILVT_MASKED) == old); 412a68c439bSRobert Richter } 413a68c439bSRobert Richter 414a68c439bSRobert Richter static unsigned int reserve_eilvt_offset(int offset, unsigned int new) 415a68c439bSRobert Richter { 4168abc3122SRobert Richter unsigned int rsvd, vector; 417a68c439bSRobert Richter 418a68c439bSRobert Richter if (offset >= APIC_EILVT_NR_MAX) 419a68c439bSRobert Richter return ~0; 420a68c439bSRobert Richter 4218abc3122SRobert Richter rsvd = atomic_read(&eilvt_offsets[offset]); 422a68c439bSRobert Richter do { 4238abc3122SRobert Richter vector = rsvd & ~APIC_EILVT_MASKED; /* 0: unassigned */ 4248abc3122SRobert Richter if (vector && !eilvt_entry_is_changeable(vector, new)) 425a68c439bSRobert Richter /* may not change if vectors are different */ 426a68c439bSRobert Richter return rsvd; 427a68c439bSRobert Richter rsvd = atomic_cmpxchg(&eilvt_offsets[offset], rsvd, new); 428a68c439bSRobert Richter } while (rsvd != new); 429a68c439bSRobert Richter 4308abc3122SRobert Richter rsvd &= ~APIC_EILVT_MASKED; 4318abc3122SRobert Richter if (rsvd && rsvd != vector) 4328abc3122SRobert Richter pr_info("LVT offset %d assigned for vector 0x%02x\n", 4338abc3122SRobert Richter offset, rsvd); 4348abc3122SRobert Richter 435a68c439bSRobert Richter return new; 436a68c439bSRobert Richter } 437a68c439bSRobert Richter 438a68c439bSRobert Richter /* 439a68c439bSRobert Richter * If mask=1, the LVT entry does not generate interrupts while mask=0 440cbf74ceaSRobert Richter * enables the vector. See also the BKDGs. Must be called with 441cbf74ceaSRobert Richter * preemption disabled. 442a68c439bSRobert Richter */ 443a68c439bSRobert Richter 44427afdf20SRobert Richter int setup_APIC_eilvt(u8 offset, u8 vector, u8 msg_type, u8 mask) 445a68c439bSRobert Richter { 446a68c439bSRobert Richter unsigned long reg = APIC_EILVTn(offset); 447a68c439bSRobert Richter unsigned int new, old, reserved; 448a68c439bSRobert Richter 449a68c439bSRobert Richter new = (mask << 16) | (msg_type << 8) | vector; 450a68c439bSRobert Richter old = apic_read(reg); 451a68c439bSRobert Richter reserved = reserve_eilvt_offset(offset, new); 452a68c439bSRobert Richter 453a68c439bSRobert Richter if (reserved != new) { 454eb48c9cbSRobert Richter pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " 455eb48c9cbSRobert Richter "vector 0x%x, but the register is already in use for " 456eb48c9cbSRobert Richter "vector 0x%x on another cpu\n", 457eb48c9cbSRobert Richter smp_processor_id(), reg, offset, new, reserved); 458a68c439bSRobert Richter return -EINVAL; 459a68c439bSRobert Richter } 460a68c439bSRobert Richter 461a68c439bSRobert Richter if (!eilvt_entry_is_changeable(old, new)) { 462eb48c9cbSRobert Richter pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " 463eb48c9cbSRobert Richter "vector 0x%x, but the register is already in use for " 464eb48c9cbSRobert Richter "vector 0x%x on this cpu\n", 465eb48c9cbSRobert Richter smp_processor_id(), reg, offset, new, old); 466a68c439bSRobert Richter return -EBUSY; 467a68c439bSRobert Richter } 468a68c439bSRobert Richter 469a68c439bSRobert Richter apic_write(reg, new); 470a68c439bSRobert Richter 471a68c439bSRobert Richter return 0; 472f62bae50SIngo Molnar } 47327afdf20SRobert Richter EXPORT_SYMBOL_GPL(setup_APIC_eilvt); 474f62bae50SIngo Molnar 475f62bae50SIngo Molnar /* 476f62bae50SIngo Molnar * Program the next event, relative to now 477f62bae50SIngo Molnar */ 478f62bae50SIngo Molnar static int lapic_next_event(unsigned long delta, 479f62bae50SIngo Molnar struct clock_event_device *evt) 480f62bae50SIngo Molnar { 481f62bae50SIngo Molnar apic_write(APIC_TMICT, delta); 482f62bae50SIngo Molnar return 0; 483f62bae50SIngo Molnar } 484f62bae50SIngo Molnar 485279f1461SSuresh Siddha static int lapic_next_deadline(unsigned long delta, 486279f1461SSuresh Siddha struct clock_event_device *evt) 487279f1461SSuresh Siddha { 488279f1461SSuresh Siddha u64 tsc; 489279f1461SSuresh Siddha 490279f1461SSuresh Siddha rdtscll(tsc); 491279f1461SSuresh Siddha wrmsrl(MSR_IA32_TSC_DEADLINE, tsc + (((u64) delta) * TSC_DIVISOR)); 492279f1461SSuresh Siddha return 0; 493279f1461SSuresh Siddha } 494279f1461SSuresh Siddha 495f62bae50SIngo Molnar /* 496f62bae50SIngo Molnar * Setup the lapic timer in periodic or oneshot mode 497f62bae50SIngo Molnar */ 498f62bae50SIngo Molnar static void lapic_timer_setup(enum clock_event_mode mode, 499f62bae50SIngo Molnar struct clock_event_device *evt) 500f62bae50SIngo Molnar { 501f62bae50SIngo Molnar unsigned long flags; 502f62bae50SIngo Molnar unsigned int v; 503f62bae50SIngo Molnar 504f62bae50SIngo Molnar /* Lapic used as dummy for broadcast ? */ 505f62bae50SIngo Molnar if (evt->features & CLOCK_EVT_FEAT_DUMMY) 506f62bae50SIngo Molnar return; 507f62bae50SIngo Molnar 508f62bae50SIngo Molnar local_irq_save(flags); 509f62bae50SIngo Molnar 510f62bae50SIngo Molnar switch (mode) { 511f62bae50SIngo Molnar case CLOCK_EVT_MODE_PERIODIC: 512f62bae50SIngo Molnar case CLOCK_EVT_MODE_ONESHOT: 5131ade93efSJacob Pan __setup_APIC_LVTT(lapic_timer_frequency, 514f62bae50SIngo Molnar mode != CLOCK_EVT_MODE_PERIODIC, 1); 515f62bae50SIngo Molnar break; 516f62bae50SIngo Molnar case CLOCK_EVT_MODE_UNUSED: 517f62bae50SIngo Molnar case CLOCK_EVT_MODE_SHUTDOWN: 518f62bae50SIngo Molnar v = apic_read(APIC_LVTT); 519f62bae50SIngo Molnar v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); 520f62bae50SIngo Molnar apic_write(APIC_LVTT, v); 5216f9b4100SAndreas Herrmann apic_write(APIC_TMICT, 0); 522f62bae50SIngo Molnar break; 523f62bae50SIngo Molnar case CLOCK_EVT_MODE_RESUME: 524f62bae50SIngo Molnar /* Nothing to do here */ 525f62bae50SIngo Molnar break; 526f62bae50SIngo Molnar } 527f62bae50SIngo Molnar 528f62bae50SIngo Molnar local_irq_restore(flags); 529f62bae50SIngo Molnar } 530f62bae50SIngo Molnar 531f62bae50SIngo Molnar /* 532f62bae50SIngo Molnar * Local APIC timer broadcast function 533f62bae50SIngo Molnar */ 534f62bae50SIngo Molnar static void lapic_timer_broadcast(const struct cpumask *mask) 535f62bae50SIngo Molnar { 536f62bae50SIngo Molnar #ifdef CONFIG_SMP 537f62bae50SIngo Molnar apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); 538f62bae50SIngo Molnar #endif 539f62bae50SIngo Molnar } 540f62bae50SIngo Molnar 54125874a29SHenrik Kretzschmar 54225874a29SHenrik Kretzschmar /* 54325874a29SHenrik Kretzschmar * The local apic timer can be used for any function which is CPU local. 54425874a29SHenrik Kretzschmar */ 54525874a29SHenrik Kretzschmar static struct clock_event_device lapic_clockevent = { 54625874a29SHenrik Kretzschmar .name = "lapic", 54725874a29SHenrik Kretzschmar .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT 54825874a29SHenrik Kretzschmar | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, 54925874a29SHenrik Kretzschmar .shift = 32, 55025874a29SHenrik Kretzschmar .set_mode = lapic_timer_setup, 55125874a29SHenrik Kretzschmar .set_next_event = lapic_next_event, 55225874a29SHenrik Kretzschmar .broadcast = lapic_timer_broadcast, 55325874a29SHenrik Kretzschmar .rating = 100, 55425874a29SHenrik Kretzschmar .irq = -1, 55525874a29SHenrik Kretzschmar }; 55625874a29SHenrik Kretzschmar static DEFINE_PER_CPU(struct clock_event_device, lapic_events); 55725874a29SHenrik Kretzschmar 558f62bae50SIngo Molnar /* 559421f91d2SUwe Kleine-König * Setup the local APIC timer for this CPU. Copy the initialized values 560f62bae50SIngo Molnar * of the boot CPU and register the clock event in the framework. 561f62bae50SIngo Molnar */ 562148f9bb8SPaul Gortmaker static void setup_APIC_timer(void) 563f62bae50SIngo Molnar { 56489cbc767SChristoph Lameter struct clock_event_device *levt = this_cpu_ptr(&lapic_events); 565f62bae50SIngo Molnar 566349c004eSChristoph Lameter if (this_cpu_has(X86_FEATURE_ARAT)) { 567db954b58SVenkatesh Pallipadi lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; 568db954b58SVenkatesh Pallipadi /* Make LAPIC timer preferrable over percpu HPET */ 569db954b58SVenkatesh Pallipadi lapic_clockevent.rating = 150; 570db954b58SVenkatesh Pallipadi } 571db954b58SVenkatesh Pallipadi 572f62bae50SIngo Molnar memcpy(levt, &lapic_clockevent, sizeof(*levt)); 573f62bae50SIngo Molnar levt->cpumask = cpumask_of(smp_processor_id()); 574f62bae50SIngo Molnar 575279f1461SSuresh Siddha if (this_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) { 576279f1461SSuresh Siddha levt->features &= ~(CLOCK_EVT_FEAT_PERIODIC | 577279f1461SSuresh Siddha CLOCK_EVT_FEAT_DUMMY); 578279f1461SSuresh Siddha levt->set_next_event = lapic_next_deadline; 579279f1461SSuresh Siddha clockevents_config_and_register(levt, 580279f1461SSuresh Siddha (tsc_khz / TSC_DIVISOR) * 1000, 581279f1461SSuresh Siddha 0xF, ~0UL); 582279f1461SSuresh Siddha } else 583f62bae50SIngo Molnar clockevents_register_device(levt); 584f62bae50SIngo Molnar } 585f62bae50SIngo Molnar 586f62bae50SIngo Molnar /* 587f62bae50SIngo Molnar * In this functions we calibrate APIC bus clocks to the external timer. 588f62bae50SIngo Molnar * 589f62bae50SIngo Molnar * We want to do the calibration only once since we want to have local timer 590f62bae50SIngo Molnar * irqs syncron. CPUs connected by the same APIC bus have the very same bus 591f62bae50SIngo Molnar * frequency. 592f62bae50SIngo Molnar * 593f62bae50SIngo Molnar * This was previously done by reading the PIT/HPET and waiting for a wrap 594f62bae50SIngo Molnar * around to find out, that a tick has elapsed. I have a box, where the PIT 595f62bae50SIngo Molnar * readout is broken, so it never gets out of the wait loop again. This was 596f62bae50SIngo Molnar * also reported by others. 597f62bae50SIngo Molnar * 598f62bae50SIngo Molnar * Monitoring the jiffies value is inaccurate and the clockevents 599f62bae50SIngo Molnar * infrastructure allows us to do a simple substitution of the interrupt 600f62bae50SIngo Molnar * handler. 601f62bae50SIngo Molnar * 602f62bae50SIngo Molnar * The calibration routine also uses the pm_timer when possible, as the PIT 603f62bae50SIngo Molnar * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes 604f62bae50SIngo Molnar * back to normal later in the boot process). 605f62bae50SIngo Molnar */ 606f62bae50SIngo Molnar 607f62bae50SIngo Molnar #define LAPIC_CAL_LOOPS (HZ/10) 608f62bae50SIngo Molnar 609f62bae50SIngo Molnar static __initdata int lapic_cal_loops = -1; 610f62bae50SIngo Molnar static __initdata long lapic_cal_t1, lapic_cal_t2; 611f62bae50SIngo Molnar static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; 612f62bae50SIngo Molnar static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; 613f62bae50SIngo Molnar static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; 614f62bae50SIngo Molnar 615f62bae50SIngo Molnar /* 616f62bae50SIngo Molnar * Temporary interrupt handler. 617f62bae50SIngo Molnar */ 618f62bae50SIngo Molnar static void __init lapic_cal_handler(struct clock_event_device *dev) 619f62bae50SIngo Molnar { 620f62bae50SIngo Molnar unsigned long long tsc = 0; 621f62bae50SIngo Molnar long tapic = apic_read(APIC_TMCCT); 622f62bae50SIngo Molnar unsigned long pm = acpi_pm_read_early(); 623f62bae50SIngo Molnar 624f62bae50SIngo Molnar if (cpu_has_tsc) 625f62bae50SIngo Molnar rdtscll(tsc); 626f62bae50SIngo Molnar 627f62bae50SIngo Molnar switch (lapic_cal_loops++) { 628f62bae50SIngo Molnar case 0: 629f62bae50SIngo Molnar lapic_cal_t1 = tapic; 630f62bae50SIngo Molnar lapic_cal_tsc1 = tsc; 631f62bae50SIngo Molnar lapic_cal_pm1 = pm; 632f62bae50SIngo Molnar lapic_cal_j1 = jiffies; 633f62bae50SIngo Molnar break; 634f62bae50SIngo Molnar 635f62bae50SIngo Molnar case LAPIC_CAL_LOOPS: 636f62bae50SIngo Molnar lapic_cal_t2 = tapic; 637f62bae50SIngo Molnar lapic_cal_tsc2 = tsc; 638f62bae50SIngo Molnar if (pm < lapic_cal_pm1) 639f62bae50SIngo Molnar pm += ACPI_PM_OVRRUN; 640f62bae50SIngo Molnar lapic_cal_pm2 = pm; 641f62bae50SIngo Molnar lapic_cal_j2 = jiffies; 642f62bae50SIngo Molnar break; 643f62bae50SIngo Molnar } 644f62bae50SIngo Molnar } 645f62bae50SIngo Molnar 646f62bae50SIngo Molnar static int __init 647f62bae50SIngo Molnar calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) 648f62bae50SIngo Molnar { 649f62bae50SIngo Molnar const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; 650f62bae50SIngo Molnar const long pm_thresh = pm_100ms / 100; 651f62bae50SIngo Molnar unsigned long mult; 652f62bae50SIngo Molnar u64 res; 653f62bae50SIngo Molnar 654f62bae50SIngo Molnar #ifndef CONFIG_X86_PM_TIMER 655f62bae50SIngo Molnar return -1; 656f62bae50SIngo Molnar #endif 657f62bae50SIngo Molnar 658f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); 659f62bae50SIngo Molnar 660f62bae50SIngo Molnar /* Check, if the PM timer is available */ 661f62bae50SIngo Molnar if (!deltapm) 662f62bae50SIngo Molnar return -1; 663f62bae50SIngo Molnar 664f62bae50SIngo Molnar mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); 665f62bae50SIngo Molnar 666f62bae50SIngo Molnar if (deltapm > (pm_100ms - pm_thresh) && 667f62bae50SIngo Molnar deltapm < (pm_100ms + pm_thresh)) { 668f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); 669f62bae50SIngo Molnar return 0; 670f62bae50SIngo Molnar } 671f62bae50SIngo Molnar 672f62bae50SIngo Molnar res = (((u64)deltapm) * mult) >> 22; 673f62bae50SIngo Molnar do_div(res, 1000000); 674f62bae50SIngo Molnar pr_warning("APIC calibration not consistent " 675f62bae50SIngo Molnar "with PM-Timer: %ldms instead of 100ms\n",(long)res); 676f62bae50SIngo Molnar 677f62bae50SIngo Molnar /* Correct the lapic counter value */ 678f62bae50SIngo Molnar res = (((u64)(*delta)) * pm_100ms); 679f62bae50SIngo Molnar do_div(res, deltapm); 680f62bae50SIngo Molnar pr_info("APIC delta adjusted to PM-Timer: " 681f62bae50SIngo Molnar "%lu (%ld)\n", (unsigned long)res, *delta); 682f62bae50SIngo Molnar *delta = (long)res; 683f62bae50SIngo Molnar 684f62bae50SIngo Molnar /* Correct the tsc counter value */ 685f62bae50SIngo Molnar if (cpu_has_tsc) { 686f62bae50SIngo Molnar res = (((u64)(*deltatsc)) * pm_100ms); 687f62bae50SIngo Molnar do_div(res, deltapm); 688f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "TSC delta adjusted to " 689f62bae50SIngo Molnar "PM-Timer: %lu (%ld)\n", 690f62bae50SIngo Molnar (unsigned long)res, *deltatsc); 691f62bae50SIngo Molnar *deltatsc = (long)res; 692f62bae50SIngo Molnar } 693f62bae50SIngo Molnar 694f62bae50SIngo Molnar return 0; 695f62bae50SIngo Molnar } 696f62bae50SIngo Molnar 697f62bae50SIngo Molnar static int __init calibrate_APIC_clock(void) 698f62bae50SIngo Molnar { 69989cbc767SChristoph Lameter struct clock_event_device *levt = this_cpu_ptr(&lapic_events); 700f62bae50SIngo Molnar void (*real_handler)(struct clock_event_device *dev); 701f62bae50SIngo Molnar unsigned long deltaj; 702f62bae50SIngo Molnar long delta, deltatsc; 703f62bae50SIngo Molnar int pm_referenced = 0; 704f62bae50SIngo Molnar 7051ade93efSJacob Pan /** 7061ade93efSJacob Pan * check if lapic timer has already been calibrated by platform 7071ade93efSJacob Pan * specific routine, such as tsc calibration code. if so, we just fill 7081ade93efSJacob Pan * in the clockevent structure and return. 7091ade93efSJacob Pan */ 7101ade93efSJacob Pan 711279f1461SSuresh Siddha if (boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER)) { 712279f1461SSuresh Siddha return 0; 713279f1461SSuresh Siddha } else if (lapic_timer_frequency) { 7141ade93efSJacob Pan apic_printk(APIC_VERBOSE, "lapic timer already calibrated %d\n", 7151ade93efSJacob Pan lapic_timer_frequency); 7161ade93efSJacob Pan lapic_clockevent.mult = div_sc(lapic_timer_frequency/APIC_DIVISOR, 7171ade93efSJacob Pan TICK_NSEC, lapic_clockevent.shift); 7181ade93efSJacob Pan lapic_clockevent.max_delta_ns = 7191ade93efSJacob Pan clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); 7201ade93efSJacob Pan lapic_clockevent.min_delta_ns = 7211ade93efSJacob Pan clockevent_delta2ns(0xF, &lapic_clockevent); 7221ade93efSJacob Pan lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; 7231ade93efSJacob Pan return 0; 7241ade93efSJacob Pan } 7251ade93efSJacob Pan 726279f1461SSuresh Siddha apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" 727279f1461SSuresh Siddha "calibrating APIC timer ...\n"); 728279f1461SSuresh Siddha 729f62bae50SIngo Molnar local_irq_disable(); 730f62bae50SIngo Molnar 731f62bae50SIngo Molnar /* Replace the global interrupt handler */ 732f62bae50SIngo Molnar real_handler = global_clock_event->event_handler; 733f62bae50SIngo Molnar global_clock_event->event_handler = lapic_cal_handler; 734f62bae50SIngo Molnar 735f62bae50SIngo Molnar /* 736f62bae50SIngo Molnar * Setup the APIC counter to maximum. There is no way the lapic 737f62bae50SIngo Molnar * can underflow in the 100ms detection time frame 738f62bae50SIngo Molnar */ 739f62bae50SIngo Molnar __setup_APIC_LVTT(0xffffffff, 0, 0); 740f62bae50SIngo Molnar 741f62bae50SIngo Molnar /* Let the interrupts run */ 742f62bae50SIngo Molnar local_irq_enable(); 743f62bae50SIngo Molnar 744f62bae50SIngo Molnar while (lapic_cal_loops <= LAPIC_CAL_LOOPS) 745f62bae50SIngo Molnar cpu_relax(); 746f62bae50SIngo Molnar 747f62bae50SIngo Molnar local_irq_disable(); 748f62bae50SIngo Molnar 749f62bae50SIngo Molnar /* Restore the real event handler */ 750f62bae50SIngo Molnar global_clock_event->event_handler = real_handler; 751f62bae50SIngo Molnar 752f62bae50SIngo Molnar /* Build delta t1-t2 as apic timer counts down */ 753f62bae50SIngo Molnar delta = lapic_cal_t1 - lapic_cal_t2; 754f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); 755f62bae50SIngo Molnar 756f62bae50SIngo Molnar deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); 757f62bae50SIngo Molnar 758f62bae50SIngo Molnar /* we trust the PM based calibration if possible */ 759f62bae50SIngo Molnar pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, 760f62bae50SIngo Molnar &delta, &deltatsc); 761f62bae50SIngo Molnar 762f62bae50SIngo Molnar /* Calculate the scaled math multiplication factor */ 763f62bae50SIngo Molnar lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, 764f62bae50SIngo Molnar lapic_clockevent.shift); 765f62bae50SIngo Molnar lapic_clockevent.max_delta_ns = 7664aed89d6SPierre Tardy clockevent_delta2ns(0x7FFFFFFF, &lapic_clockevent); 767f62bae50SIngo Molnar lapic_clockevent.min_delta_ns = 768f62bae50SIngo Molnar clockevent_delta2ns(0xF, &lapic_clockevent); 769f62bae50SIngo Molnar 7701ade93efSJacob Pan lapic_timer_frequency = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; 771f62bae50SIngo Molnar 772f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); 773411462f6SThomas Gleixner apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult); 774f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", 7751ade93efSJacob Pan lapic_timer_frequency); 776f62bae50SIngo Molnar 777f62bae50SIngo Molnar if (cpu_has_tsc) { 778f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... CPU clock speed is " 779f62bae50SIngo Molnar "%ld.%04ld MHz.\n", 780f62bae50SIngo Molnar (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), 781f62bae50SIngo Molnar (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); 782f62bae50SIngo Molnar } 783f62bae50SIngo Molnar 784f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... host bus clock speed is " 785f62bae50SIngo Molnar "%u.%04u MHz.\n", 7861ade93efSJacob Pan lapic_timer_frequency / (1000000 / HZ), 7871ade93efSJacob Pan lapic_timer_frequency % (1000000 / HZ)); 788f62bae50SIngo Molnar 789f62bae50SIngo Molnar /* 790f62bae50SIngo Molnar * Do a sanity check on the APIC calibration result 791f62bae50SIngo Molnar */ 7921ade93efSJacob Pan if (lapic_timer_frequency < (1000000 / HZ)) { 793f62bae50SIngo Molnar local_irq_enable(); 794f62bae50SIngo Molnar pr_warning("APIC frequency too slow, disabling apic timer\n"); 795f62bae50SIngo Molnar return -1; 796f62bae50SIngo Molnar } 797f62bae50SIngo Molnar 798f62bae50SIngo Molnar levt->features &= ~CLOCK_EVT_FEAT_DUMMY; 799f62bae50SIngo Molnar 800f62bae50SIngo Molnar /* 801f62bae50SIngo Molnar * PM timer calibration failed or not turned on 802f62bae50SIngo Molnar * so lets try APIC timer based calibration 803f62bae50SIngo Molnar */ 804f62bae50SIngo Molnar if (!pm_referenced) { 805f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); 806f62bae50SIngo Molnar 807f62bae50SIngo Molnar /* 808f62bae50SIngo Molnar * Setup the apic timer manually 809f62bae50SIngo Molnar */ 810f62bae50SIngo Molnar levt->event_handler = lapic_cal_handler; 811f62bae50SIngo Molnar lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); 812f62bae50SIngo Molnar lapic_cal_loops = -1; 813f62bae50SIngo Molnar 814f62bae50SIngo Molnar /* Let the interrupts run */ 815f62bae50SIngo Molnar local_irq_enable(); 816f62bae50SIngo Molnar 817f62bae50SIngo Molnar while (lapic_cal_loops <= LAPIC_CAL_LOOPS) 818f62bae50SIngo Molnar cpu_relax(); 819f62bae50SIngo Molnar 820f62bae50SIngo Molnar /* Stop the lapic timer */ 821f62bae50SIngo Molnar lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); 822f62bae50SIngo Molnar 823f62bae50SIngo Molnar /* Jiffies delta */ 824f62bae50SIngo Molnar deltaj = lapic_cal_j2 - lapic_cal_j1; 825f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); 826f62bae50SIngo Molnar 827f62bae50SIngo Molnar /* Check, if the jiffies result is consistent */ 828f62bae50SIngo Molnar if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) 829f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); 830f62bae50SIngo Molnar else 831f62bae50SIngo Molnar levt->features |= CLOCK_EVT_FEAT_DUMMY; 832f62bae50SIngo Molnar } else 833f62bae50SIngo Molnar local_irq_enable(); 834f62bae50SIngo Molnar 835f62bae50SIngo Molnar if (levt->features & CLOCK_EVT_FEAT_DUMMY) { 836f62bae50SIngo Molnar pr_warning("APIC timer disabled due to verification failure\n"); 837f62bae50SIngo Molnar return -1; 838f62bae50SIngo Molnar } 839f62bae50SIngo Molnar 840f62bae50SIngo Molnar return 0; 841f62bae50SIngo Molnar } 842f62bae50SIngo Molnar 843f62bae50SIngo Molnar /* 844f62bae50SIngo Molnar * Setup the boot APIC 845f62bae50SIngo Molnar * 846f62bae50SIngo Molnar * Calibrate and verify the result. 847f62bae50SIngo Molnar */ 848f62bae50SIngo Molnar void __init setup_boot_APIC_clock(void) 849f62bae50SIngo Molnar { 850f62bae50SIngo Molnar /* 851f62bae50SIngo Molnar * The local apic timer can be disabled via the kernel 852f62bae50SIngo Molnar * commandline or from the CPU detection code. Register the lapic 853f62bae50SIngo Molnar * timer as a dummy clock event source on SMP systems, so the 854f62bae50SIngo Molnar * broadcast mechanism is used. On UP systems simply ignore it. 855f62bae50SIngo Molnar */ 856f62bae50SIngo Molnar if (disable_apic_timer) { 857f62bae50SIngo Molnar pr_info("Disabling APIC timer\n"); 858f62bae50SIngo Molnar /* No broadcast on UP ! */ 859f62bae50SIngo Molnar if (num_possible_cpus() > 1) { 860f62bae50SIngo Molnar lapic_clockevent.mult = 1; 861f62bae50SIngo Molnar setup_APIC_timer(); 862f62bae50SIngo Molnar } 863f62bae50SIngo Molnar return; 864f62bae50SIngo Molnar } 865f62bae50SIngo Molnar 866f62bae50SIngo Molnar if (calibrate_APIC_clock()) { 867f62bae50SIngo Molnar /* No broadcast on UP ! */ 868f62bae50SIngo Molnar if (num_possible_cpus() > 1) 869f62bae50SIngo Molnar setup_APIC_timer(); 870f62bae50SIngo Molnar return; 871f62bae50SIngo Molnar } 872f62bae50SIngo Molnar 873f62bae50SIngo Molnar /* 874f62bae50SIngo Molnar * If nmi_watchdog is set to IO_APIC, we need the 875f62bae50SIngo Molnar * PIT/HPET going. Otherwise register lapic as a dummy 876f62bae50SIngo Molnar * device. 877f62bae50SIngo Molnar */ 878f62bae50SIngo Molnar lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; 879f62bae50SIngo Molnar 880f62bae50SIngo Molnar /* Setup the lapic or request the broadcast */ 881f62bae50SIngo Molnar setup_APIC_timer(); 882f62bae50SIngo Molnar } 883f62bae50SIngo Molnar 884148f9bb8SPaul Gortmaker void setup_secondary_APIC_clock(void) 885f62bae50SIngo Molnar { 886f62bae50SIngo Molnar setup_APIC_timer(); 887f62bae50SIngo Molnar } 888f62bae50SIngo Molnar 889f62bae50SIngo Molnar /* 890f62bae50SIngo Molnar * The guts of the apic timer interrupt 891f62bae50SIngo Molnar */ 892f62bae50SIngo Molnar static void local_apic_timer_interrupt(void) 893f62bae50SIngo Molnar { 894f62bae50SIngo Molnar int cpu = smp_processor_id(); 895f62bae50SIngo Molnar struct clock_event_device *evt = &per_cpu(lapic_events, cpu); 896f62bae50SIngo Molnar 897f62bae50SIngo Molnar /* 898f62bae50SIngo Molnar * Normally we should not be here till LAPIC has been initialized but 899f62bae50SIngo Molnar * in some cases like kdump, its possible that there is a pending LAPIC 900f62bae50SIngo Molnar * timer interrupt from previous kernel's context and is delivered in 901f62bae50SIngo Molnar * new kernel the moment interrupts are enabled. 902f62bae50SIngo Molnar * 903f62bae50SIngo Molnar * Interrupts are enabled early and LAPIC is setup much later, hence 904f62bae50SIngo Molnar * its possible that when we get here evt->event_handler is NULL. 905f62bae50SIngo Molnar * Check for event_handler being NULL and discard the interrupt as 906f62bae50SIngo Molnar * spurious. 907f62bae50SIngo Molnar */ 908f62bae50SIngo Molnar if (!evt->event_handler) { 909f62bae50SIngo Molnar pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); 910f62bae50SIngo Molnar /* Switch it off */ 911f62bae50SIngo Molnar lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); 912f62bae50SIngo Molnar return; 913f62bae50SIngo Molnar } 914f62bae50SIngo Molnar 915f62bae50SIngo Molnar /* 916f62bae50SIngo Molnar * the NMI deadlock-detector uses this. 917f62bae50SIngo Molnar */ 918f62bae50SIngo Molnar inc_irq_stat(apic_timer_irqs); 919f62bae50SIngo Molnar 920f62bae50SIngo Molnar evt->event_handler(evt); 921f62bae50SIngo Molnar } 922f62bae50SIngo Molnar 923f62bae50SIngo Molnar /* 924f62bae50SIngo Molnar * Local APIC timer interrupt. This is the most natural way for doing 925f62bae50SIngo Molnar * local interrupts, but local timer interrupts can be emulated by 926f62bae50SIngo Molnar * broadcast interrupts too. [in case the hw doesn't support APIC timers] 927f62bae50SIngo Molnar * 928f62bae50SIngo Molnar * [ if a single-CPU system runs an SMP kernel then we call the local 929f62bae50SIngo Molnar * interrupt as well. Thus we cannot inline the local irq ... ] 930f62bae50SIngo Molnar */ 9311d9090e2SAndi Kleen __visible void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) 932f62bae50SIngo Molnar { 933f62bae50SIngo Molnar struct pt_regs *old_regs = set_irq_regs(regs); 934f62bae50SIngo Molnar 935f62bae50SIngo Molnar /* 936f62bae50SIngo Molnar * NOTE! We'd better ACK the irq immediately, 937f62bae50SIngo Molnar * because timer handling can be slow. 938eddc0e92SSeiji Aguchi * 939f62bae50SIngo Molnar * update_process_times() expects us to have done irq_enter(). 940f62bae50SIngo Molnar * Besides, if we don't timer interrupts ignore the global 941f62bae50SIngo Molnar * interrupt lock, which is the WrongThing (tm) to do. 942f62bae50SIngo Molnar */ 943eddc0e92SSeiji Aguchi entering_ack_irq(); 944f62bae50SIngo Molnar local_apic_timer_interrupt(); 945eddc0e92SSeiji Aguchi exiting_irq(); 946f62bae50SIngo Molnar 947f62bae50SIngo Molnar set_irq_regs(old_regs); 948f62bae50SIngo Molnar } 949f62bae50SIngo Molnar 9501d9090e2SAndi Kleen __visible void __irq_entry smp_trace_apic_timer_interrupt(struct pt_regs *regs) 951cf910e83SSeiji Aguchi { 952cf910e83SSeiji Aguchi struct pt_regs *old_regs = set_irq_regs(regs); 953cf910e83SSeiji Aguchi 954cf910e83SSeiji Aguchi /* 955cf910e83SSeiji Aguchi * NOTE! We'd better ACK the irq immediately, 956cf910e83SSeiji Aguchi * because timer handling can be slow. 957cf910e83SSeiji Aguchi * 958cf910e83SSeiji Aguchi * update_process_times() expects us to have done irq_enter(). 959cf910e83SSeiji Aguchi * Besides, if we don't timer interrupts ignore the global 960cf910e83SSeiji Aguchi * interrupt lock, which is the WrongThing (tm) to do. 961cf910e83SSeiji Aguchi */ 962cf910e83SSeiji Aguchi entering_ack_irq(); 963cf910e83SSeiji Aguchi trace_local_timer_entry(LOCAL_TIMER_VECTOR); 964cf910e83SSeiji Aguchi local_apic_timer_interrupt(); 965cf910e83SSeiji Aguchi trace_local_timer_exit(LOCAL_TIMER_VECTOR); 966cf910e83SSeiji Aguchi exiting_irq(); 967f62bae50SIngo Molnar 968f62bae50SIngo Molnar set_irq_regs(old_regs); 969f62bae50SIngo Molnar } 970f62bae50SIngo Molnar 971f62bae50SIngo Molnar int setup_profiling_timer(unsigned int multiplier) 972f62bae50SIngo Molnar { 973f62bae50SIngo Molnar return -EINVAL; 974f62bae50SIngo Molnar } 975f62bae50SIngo Molnar 976f62bae50SIngo Molnar /* 977f62bae50SIngo Molnar * Local APIC start and shutdown 978f62bae50SIngo Molnar */ 979f62bae50SIngo Molnar 980f62bae50SIngo Molnar /** 981f62bae50SIngo Molnar * clear_local_APIC - shutdown the local APIC 982f62bae50SIngo Molnar * 983f62bae50SIngo Molnar * This is called, when a CPU is disabled and before rebooting, so the state of 984f62bae50SIngo Molnar * the local APIC has no dangling leftovers. Also used to cleanout any BIOS 985f62bae50SIngo Molnar * leftovers during boot. 986f62bae50SIngo Molnar */ 987f62bae50SIngo Molnar void clear_local_APIC(void) 988f62bae50SIngo Molnar { 989f62bae50SIngo Molnar int maxlvt; 990f62bae50SIngo Molnar u32 v; 991f62bae50SIngo Molnar 992f62bae50SIngo Molnar /* APIC hasn't been mapped yet */ 993fc1edaf9SSuresh Siddha if (!x2apic_mode && !apic_phys) 994f62bae50SIngo Molnar return; 995f62bae50SIngo Molnar 996f62bae50SIngo Molnar maxlvt = lapic_get_maxlvt(); 997f62bae50SIngo Molnar /* 998f62bae50SIngo Molnar * Masking an LVT entry can trigger a local APIC error 999f62bae50SIngo Molnar * if the vector is zero. Mask LVTERR first to prevent this. 1000f62bae50SIngo Molnar */ 1001f62bae50SIngo Molnar if (maxlvt >= 3) { 1002f62bae50SIngo Molnar v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ 1003f62bae50SIngo Molnar apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); 1004f62bae50SIngo Molnar } 1005f62bae50SIngo Molnar /* 1006f62bae50SIngo Molnar * Careful: we have to set masks only first to deassert 1007f62bae50SIngo Molnar * any level-triggered sources. 1008f62bae50SIngo Molnar */ 1009f62bae50SIngo Molnar v = apic_read(APIC_LVTT); 1010f62bae50SIngo Molnar apic_write(APIC_LVTT, v | APIC_LVT_MASKED); 1011f62bae50SIngo Molnar v = apic_read(APIC_LVT0); 1012f62bae50SIngo Molnar apic_write(APIC_LVT0, v | APIC_LVT_MASKED); 1013f62bae50SIngo Molnar v = apic_read(APIC_LVT1); 1014f62bae50SIngo Molnar apic_write(APIC_LVT1, v | APIC_LVT_MASKED); 1015f62bae50SIngo Molnar if (maxlvt >= 4) { 1016f62bae50SIngo Molnar v = apic_read(APIC_LVTPC); 1017f62bae50SIngo Molnar apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); 1018f62bae50SIngo Molnar } 1019f62bae50SIngo Molnar 1020f62bae50SIngo Molnar /* lets not touch this if we didn't frob it */ 10214efc0670SAndi Kleen #ifdef CONFIG_X86_THERMAL_VECTOR 1022f62bae50SIngo Molnar if (maxlvt >= 5) { 1023f62bae50SIngo Molnar v = apic_read(APIC_LVTTHMR); 1024f62bae50SIngo Molnar apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); 1025f62bae50SIngo Molnar } 1026f62bae50SIngo Molnar #endif 1027638bee71SH. Peter Anvin #ifdef CONFIG_X86_MCE_INTEL 1028638bee71SH. Peter Anvin if (maxlvt >= 6) { 1029638bee71SH. Peter Anvin v = apic_read(APIC_LVTCMCI); 1030638bee71SH. Peter Anvin if (!(v & APIC_LVT_MASKED)) 1031638bee71SH. Peter Anvin apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); 1032638bee71SH. Peter Anvin } 1033638bee71SH. Peter Anvin #endif 1034638bee71SH. Peter Anvin 1035f62bae50SIngo Molnar /* 1036f62bae50SIngo Molnar * Clean APIC state for other OSs: 1037f62bae50SIngo Molnar */ 1038f62bae50SIngo Molnar apic_write(APIC_LVTT, APIC_LVT_MASKED); 1039f62bae50SIngo Molnar apic_write(APIC_LVT0, APIC_LVT_MASKED); 1040f62bae50SIngo Molnar apic_write(APIC_LVT1, APIC_LVT_MASKED); 1041f62bae50SIngo Molnar if (maxlvt >= 3) 1042f62bae50SIngo Molnar apic_write(APIC_LVTERR, APIC_LVT_MASKED); 1043f62bae50SIngo Molnar if (maxlvt >= 4) 1044f62bae50SIngo Molnar apic_write(APIC_LVTPC, APIC_LVT_MASKED); 1045f62bae50SIngo Molnar 1046f62bae50SIngo Molnar /* Integrated APIC (!82489DX) ? */ 1047f62bae50SIngo Molnar if (lapic_is_integrated()) { 1048f62bae50SIngo Molnar if (maxlvt > 3) 1049f62bae50SIngo Molnar /* Clear ESR due to Pentium errata 3AP and 11AP */ 1050f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1051f62bae50SIngo Molnar apic_read(APIC_ESR); 1052f62bae50SIngo Molnar } 1053f62bae50SIngo Molnar } 1054f62bae50SIngo Molnar 1055f62bae50SIngo Molnar /** 1056f62bae50SIngo Molnar * disable_local_APIC - clear and disable the local APIC 1057f62bae50SIngo Molnar */ 1058f62bae50SIngo Molnar void disable_local_APIC(void) 1059f62bae50SIngo Molnar { 1060f62bae50SIngo Molnar unsigned int value; 1061f62bae50SIngo Molnar 1062f62bae50SIngo Molnar /* APIC hasn't been mapped yet */ 1063fd19dce7SYinghai Lu if (!x2apic_mode && !apic_phys) 1064f62bae50SIngo Molnar return; 1065f62bae50SIngo Molnar 1066f62bae50SIngo Molnar clear_local_APIC(); 1067f62bae50SIngo Molnar 1068f62bae50SIngo Molnar /* 1069f62bae50SIngo Molnar * Disable APIC (implies clearing of registers 1070f62bae50SIngo Molnar * for 82489DX!). 1071f62bae50SIngo Molnar */ 1072f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 1073f62bae50SIngo Molnar value &= ~APIC_SPIV_APIC_ENABLED; 1074f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 1075f62bae50SIngo Molnar 1076f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1077f62bae50SIngo Molnar /* 1078f62bae50SIngo Molnar * When LAPIC was disabled by the BIOS and enabled by the kernel, 1079f62bae50SIngo Molnar * restore the disabled state. 1080f62bae50SIngo Molnar */ 1081f62bae50SIngo Molnar if (enabled_via_apicbase) { 1082f62bae50SIngo Molnar unsigned int l, h; 1083f62bae50SIngo Molnar 1084f62bae50SIngo Molnar rdmsr(MSR_IA32_APICBASE, l, h); 1085f62bae50SIngo Molnar l &= ~MSR_IA32_APICBASE_ENABLE; 1086f62bae50SIngo Molnar wrmsr(MSR_IA32_APICBASE, l, h); 1087f62bae50SIngo Molnar } 1088f62bae50SIngo Molnar #endif 1089f62bae50SIngo Molnar } 1090f62bae50SIngo Molnar 1091f62bae50SIngo Molnar /* 1092f62bae50SIngo Molnar * If Linux enabled the LAPIC against the BIOS default disable it down before 1093f62bae50SIngo Molnar * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and 1094f62bae50SIngo Molnar * not power-off. Additionally clear all LVT entries before disable_local_APIC 1095f62bae50SIngo Molnar * for the case where Linux didn't enable the LAPIC. 1096f62bae50SIngo Molnar */ 1097f62bae50SIngo Molnar void lapic_shutdown(void) 1098f62bae50SIngo Molnar { 1099f62bae50SIngo Molnar unsigned long flags; 1100f62bae50SIngo Molnar 11018312136fSCyrill Gorcunov if (!cpu_has_apic && !apic_from_smp_config()) 1102f62bae50SIngo Molnar return; 1103f62bae50SIngo Molnar 1104f62bae50SIngo Molnar local_irq_save(flags); 1105f62bae50SIngo Molnar 1106f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1107f62bae50SIngo Molnar if (!enabled_via_apicbase) 1108f62bae50SIngo Molnar clear_local_APIC(); 1109f62bae50SIngo Molnar else 1110f62bae50SIngo Molnar #endif 1111f62bae50SIngo Molnar disable_local_APIC(); 1112f62bae50SIngo Molnar 1113f62bae50SIngo Molnar 1114f62bae50SIngo Molnar local_irq_restore(flags); 1115f62bae50SIngo Molnar } 1116f62bae50SIngo Molnar 1117f62bae50SIngo Molnar /* 1118f62bae50SIngo Molnar * This is to verify that we're looking at a real local APIC. 1119f62bae50SIngo Molnar * Check these against your board if the CPUs aren't getting 1120f62bae50SIngo Molnar * started for no apparent reason. 1121f62bae50SIngo Molnar */ 1122f62bae50SIngo Molnar int __init verify_local_APIC(void) 1123f62bae50SIngo Molnar { 1124f62bae50SIngo Molnar unsigned int reg0, reg1; 1125f62bae50SIngo Molnar 1126f62bae50SIngo Molnar /* 1127f62bae50SIngo Molnar * The version register is read-only in a real APIC. 1128f62bae50SIngo Molnar */ 1129f62bae50SIngo Molnar reg0 = apic_read(APIC_LVR); 1130f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); 1131f62bae50SIngo Molnar apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); 1132f62bae50SIngo Molnar reg1 = apic_read(APIC_LVR); 1133f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); 1134f62bae50SIngo Molnar 1135f62bae50SIngo Molnar /* 1136f62bae50SIngo Molnar * The two version reads above should print the same 1137f62bae50SIngo Molnar * numbers. If the second one is different, then we 1138f62bae50SIngo Molnar * poke at a non-APIC. 1139f62bae50SIngo Molnar */ 1140f62bae50SIngo Molnar if (reg1 != reg0) 1141f62bae50SIngo Molnar return 0; 1142f62bae50SIngo Molnar 1143f62bae50SIngo Molnar /* 1144f62bae50SIngo Molnar * Check if the version looks reasonably. 1145f62bae50SIngo Molnar */ 1146f62bae50SIngo Molnar reg1 = GET_APIC_VERSION(reg0); 1147f62bae50SIngo Molnar if (reg1 == 0x00 || reg1 == 0xff) 1148f62bae50SIngo Molnar return 0; 1149f62bae50SIngo Molnar reg1 = lapic_get_maxlvt(); 1150f62bae50SIngo Molnar if (reg1 < 0x02 || reg1 == 0xff) 1151f62bae50SIngo Molnar return 0; 1152f62bae50SIngo Molnar 1153f62bae50SIngo Molnar /* 1154f62bae50SIngo Molnar * The ID register is read/write in a real APIC. 1155f62bae50SIngo Molnar */ 1156f62bae50SIngo Molnar reg0 = apic_read(APIC_ID); 1157f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); 1158f62bae50SIngo Molnar apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); 1159f62bae50SIngo Molnar reg1 = apic_read(APIC_ID); 1160f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); 1161f62bae50SIngo Molnar apic_write(APIC_ID, reg0); 1162f62bae50SIngo Molnar if (reg1 != (reg0 ^ apic->apic_id_mask)) 1163f62bae50SIngo Molnar return 0; 1164f62bae50SIngo Molnar 1165f62bae50SIngo Molnar /* 1166f62bae50SIngo Molnar * The next two are just to see if we have sane values. 1167f62bae50SIngo Molnar * They're only really relevant if we're in Virtual Wire 1168f62bae50SIngo Molnar * compatibility mode, but most boxes are anymore. 1169f62bae50SIngo Molnar */ 1170f62bae50SIngo Molnar reg0 = apic_read(APIC_LVT0); 1171f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); 1172f62bae50SIngo Molnar reg1 = apic_read(APIC_LVT1); 1173f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); 1174f62bae50SIngo Molnar 1175f62bae50SIngo Molnar return 1; 1176f62bae50SIngo Molnar } 1177f62bae50SIngo Molnar 1178f62bae50SIngo Molnar /** 1179f62bae50SIngo Molnar * sync_Arb_IDs - synchronize APIC bus arbitration IDs 1180f62bae50SIngo Molnar */ 1181f62bae50SIngo Molnar void __init sync_Arb_IDs(void) 1182f62bae50SIngo Molnar { 1183f62bae50SIngo Molnar /* 1184f62bae50SIngo Molnar * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not 1185f62bae50SIngo Molnar * needed on AMD. 1186f62bae50SIngo Molnar */ 1187f62bae50SIngo Molnar if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 1188f62bae50SIngo Molnar return; 1189f62bae50SIngo Molnar 1190f62bae50SIngo Molnar /* 1191f62bae50SIngo Molnar * Wait for idle. 1192f62bae50SIngo Molnar */ 1193f62bae50SIngo Molnar apic_wait_icr_idle(); 1194f62bae50SIngo Molnar 1195f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); 1196f62bae50SIngo Molnar apic_write(APIC_ICR, APIC_DEST_ALLINC | 1197f62bae50SIngo Molnar APIC_INT_LEVELTRIG | APIC_DM_INIT); 1198f62bae50SIngo Molnar } 1199f62bae50SIngo Molnar 1200f62bae50SIngo Molnar /* 1201f62bae50SIngo Molnar * An initial setup of the virtual wire mode. 1202f62bae50SIngo Molnar */ 1203f62bae50SIngo Molnar void __init init_bsp_APIC(void) 1204f62bae50SIngo Molnar { 1205f62bae50SIngo Molnar unsigned int value; 1206f62bae50SIngo Molnar 1207f62bae50SIngo Molnar /* 1208f62bae50SIngo Molnar * Don't do the setup now if we have a SMP BIOS as the 1209f62bae50SIngo Molnar * through-I/O-APIC virtual wire mode might be active. 1210f62bae50SIngo Molnar */ 1211f62bae50SIngo Molnar if (smp_found_config || !cpu_has_apic) 1212f62bae50SIngo Molnar return; 1213f62bae50SIngo Molnar 1214f62bae50SIngo Molnar /* 1215f62bae50SIngo Molnar * Do not trust the local APIC being empty at bootup. 1216f62bae50SIngo Molnar */ 1217f62bae50SIngo Molnar clear_local_APIC(); 1218f62bae50SIngo Molnar 1219f62bae50SIngo Molnar /* 1220f62bae50SIngo Molnar * Enable APIC. 1221f62bae50SIngo Molnar */ 1222f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 1223f62bae50SIngo Molnar value &= ~APIC_VECTOR_MASK; 1224f62bae50SIngo Molnar value |= APIC_SPIV_APIC_ENABLED; 1225f62bae50SIngo Molnar 1226f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1227f62bae50SIngo Molnar /* This bit is reserved on P4/Xeon and should be cleared */ 1228f62bae50SIngo Molnar if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && 1229f62bae50SIngo Molnar (boot_cpu_data.x86 == 15)) 1230f62bae50SIngo Molnar value &= ~APIC_SPIV_FOCUS_DISABLED; 1231f62bae50SIngo Molnar else 1232f62bae50SIngo Molnar #endif 1233f62bae50SIngo Molnar value |= APIC_SPIV_FOCUS_DISABLED; 1234f62bae50SIngo Molnar value |= SPURIOUS_APIC_VECTOR; 1235f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 1236f62bae50SIngo Molnar 1237f62bae50SIngo Molnar /* 1238f62bae50SIngo Molnar * Set up the virtual wire mode. 1239f62bae50SIngo Molnar */ 1240f62bae50SIngo Molnar apic_write(APIC_LVT0, APIC_DM_EXTINT); 1241f62bae50SIngo Molnar value = APIC_DM_NMI; 1242f62bae50SIngo Molnar if (!lapic_is_integrated()) /* 82489DX */ 1243f62bae50SIngo Molnar value |= APIC_LVT_LEVEL_TRIGGER; 1244f62bae50SIngo Molnar apic_write(APIC_LVT1, value); 1245f62bae50SIngo Molnar } 1246f62bae50SIngo Molnar 1247148f9bb8SPaul Gortmaker static void lapic_setup_esr(void) 1248f62bae50SIngo Molnar { 1249f62bae50SIngo Molnar unsigned int oldvalue, value, maxlvt; 1250f62bae50SIngo Molnar 1251f62bae50SIngo Molnar if (!lapic_is_integrated()) { 1252f62bae50SIngo Molnar pr_info("No ESR for 82489DX.\n"); 1253f62bae50SIngo Molnar return; 1254f62bae50SIngo Molnar } 1255f62bae50SIngo Molnar 1256f62bae50SIngo Molnar if (apic->disable_esr) { 1257f62bae50SIngo Molnar /* 1258f62bae50SIngo Molnar * Something untraceable is creating bad interrupts on 1259f62bae50SIngo Molnar * secondary quads ... for the moment, just leave the 1260f62bae50SIngo Molnar * ESR disabled - we can't do anything useful with the 1261f62bae50SIngo Molnar * errors anyway - mbligh 1262f62bae50SIngo Molnar */ 1263f62bae50SIngo Molnar pr_info("Leaving ESR disabled.\n"); 1264f62bae50SIngo Molnar return; 1265f62bae50SIngo Molnar } 1266f62bae50SIngo Molnar 1267f62bae50SIngo Molnar maxlvt = lapic_get_maxlvt(); 1268f62bae50SIngo Molnar if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ 1269f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1270f62bae50SIngo Molnar oldvalue = apic_read(APIC_ESR); 1271f62bae50SIngo Molnar 1272f62bae50SIngo Molnar /* enables sending errors */ 1273f62bae50SIngo Molnar value = ERROR_APIC_VECTOR; 1274f62bae50SIngo Molnar apic_write(APIC_LVTERR, value); 1275f62bae50SIngo Molnar 1276f62bae50SIngo Molnar /* 1277f62bae50SIngo Molnar * spec says clear errors after enabling vector. 1278f62bae50SIngo Molnar */ 1279f62bae50SIngo Molnar if (maxlvt > 3) 1280f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1281f62bae50SIngo Molnar value = apic_read(APIC_ESR); 1282f62bae50SIngo Molnar if (value != oldvalue) 1283f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "ESR value before enabling " 1284f62bae50SIngo Molnar "vector: 0x%08x after: 0x%08x\n", 1285f62bae50SIngo Molnar oldvalue, value); 1286f62bae50SIngo Molnar } 1287f62bae50SIngo Molnar 1288f62bae50SIngo Molnar /** 1289f62bae50SIngo Molnar * setup_local_APIC - setup the local APIC 12900aa002feSTejun Heo * 12910aa002feSTejun Heo * Used to setup local APIC while initializing BSP or bringin up APs. 12920aa002feSTejun Heo * Always called with preemption disabled. 1293f62bae50SIngo Molnar */ 1294148f9bb8SPaul Gortmaker void setup_local_APIC(void) 1295f62bae50SIngo Molnar { 12960aa002feSTejun Heo int cpu = smp_processor_id(); 12978c3ba8d0SKerstin Jonsson unsigned int value, queued; 12988c3ba8d0SKerstin Jonsson int i, j, acked = 0; 12998c3ba8d0SKerstin Jonsson unsigned long long tsc = 0, ntsc; 1300b47dcbdcSAndy Lutomirski long long max_loops = cpu_khz ? cpu_khz : 1000000; 13018c3ba8d0SKerstin Jonsson 13028c3ba8d0SKerstin Jonsson if (cpu_has_tsc) 13038c3ba8d0SKerstin Jonsson rdtscll(tsc); 1304f62bae50SIngo Molnar 1305f62bae50SIngo Molnar if (disable_apic) { 13067167d08eSHenrik Kretzschmar disable_ioapic_support(); 1307f62bae50SIngo Molnar return; 1308f62bae50SIngo Molnar } 1309f62bae50SIngo Molnar 1310f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1311f62bae50SIngo Molnar /* Pound the ESR really hard over the head with a big hammer - mbligh */ 1312f62bae50SIngo Molnar if (lapic_is_integrated() && apic->disable_esr) { 1313f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1314f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1315f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1316f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1317f62bae50SIngo Molnar } 1318f62bae50SIngo Molnar #endif 1319cdd6c482SIngo Molnar perf_events_lapic_init(); 1320f62bae50SIngo Molnar 1321f62bae50SIngo Molnar /* 1322f62bae50SIngo Molnar * Double-check whether this APIC is really registered. 1323f62bae50SIngo Molnar * This is meaningless in clustered apic mode, so we skip it. 1324f62bae50SIngo Molnar */ 1325c2777f98SDaniel Walker BUG_ON(!apic->apic_id_registered()); 1326f62bae50SIngo Molnar 1327f62bae50SIngo Molnar /* 1328f62bae50SIngo Molnar * Intel recommends to set DFR, LDR and TPR before enabling 1329f62bae50SIngo Molnar * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 1330f62bae50SIngo Molnar * document number 292116). So here it goes... 1331f62bae50SIngo Molnar */ 1332f62bae50SIngo Molnar apic->init_apic_ldr(); 1333f62bae50SIngo Molnar 13346f802c4bSTejun Heo #ifdef CONFIG_X86_32 13356f802c4bSTejun Heo /* 1336acb8bc09STejun Heo * APIC LDR is initialized. If logical_apicid mapping was 1337acb8bc09STejun Heo * initialized during get_smp_config(), make sure it matches the 1338acb8bc09STejun Heo * actual value. 13396f802c4bSTejun Heo */ 1340acb8bc09STejun Heo i = early_per_cpu(x86_cpu_to_logical_apicid, cpu); 1341acb8bc09STejun Heo WARN_ON(i != BAD_APICID && i != logical_smp_processor_id()); 1342acb8bc09STejun Heo /* always use the value from LDR */ 13436f802c4bSTejun Heo early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 13446f802c4bSTejun Heo logical_smp_processor_id(); 13456f802c4bSTejun Heo #endif 13466f802c4bSTejun Heo 1347f62bae50SIngo Molnar /* 1348f62bae50SIngo Molnar * Set Task Priority to 'accept all'. We never change this 1349f62bae50SIngo Molnar * later on. 1350f62bae50SIngo Molnar */ 1351f62bae50SIngo Molnar value = apic_read(APIC_TASKPRI); 1352f62bae50SIngo Molnar value &= ~APIC_TPRI_MASK; 1353f62bae50SIngo Molnar apic_write(APIC_TASKPRI, value); 1354f62bae50SIngo Molnar 1355f62bae50SIngo Molnar /* 1356f62bae50SIngo Molnar * After a crash, we no longer service the interrupts and a pending 1357f62bae50SIngo Molnar * interrupt from previous kernel might still have ISR bit set. 1358f62bae50SIngo Molnar * 1359f62bae50SIngo Molnar * Most probably by now CPU has serviced that pending interrupt and 1360f62bae50SIngo Molnar * it might not have done the ack_APIC_irq() because it thought, 1361f62bae50SIngo Molnar * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it 1362f62bae50SIngo Molnar * does not clear the ISR bit and cpu thinks it has already serivced 1363f62bae50SIngo Molnar * the interrupt. Hence a vector might get locked. It was noticed 1364f62bae50SIngo Molnar * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. 1365f62bae50SIngo Molnar */ 13668c3ba8d0SKerstin Jonsson do { 13678c3ba8d0SKerstin Jonsson queued = 0; 13688c3ba8d0SKerstin Jonsson for (i = APIC_ISR_NR - 1; i >= 0; i--) 13698c3ba8d0SKerstin Jonsson queued |= apic_read(APIC_IRR + i*0x10); 13708c3ba8d0SKerstin Jonsson 1371f62bae50SIngo Molnar for (i = APIC_ISR_NR - 1; i >= 0; i--) { 1372f62bae50SIngo Molnar value = apic_read(APIC_ISR + i*0x10); 1373f62bae50SIngo Molnar for (j = 31; j >= 0; j--) { 13748c3ba8d0SKerstin Jonsson if (value & (1<<j)) { 1375f62bae50SIngo Molnar ack_APIC_irq(); 13768c3ba8d0SKerstin Jonsson acked++; 1377f62bae50SIngo Molnar } 1378f62bae50SIngo Molnar } 13798c3ba8d0SKerstin Jonsson } 13808c3ba8d0SKerstin Jonsson if (acked > 256) { 13818c3ba8d0SKerstin Jonsson printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n", 13828c3ba8d0SKerstin Jonsson acked); 13838c3ba8d0SKerstin Jonsson break; 13848c3ba8d0SKerstin Jonsson } 138542fa4250SShai Fultheim if (queued) { 1386b47dcbdcSAndy Lutomirski if (cpu_has_tsc && cpu_khz) { 13878c3ba8d0SKerstin Jonsson rdtscll(ntsc); 13888c3ba8d0SKerstin Jonsson max_loops = (cpu_khz << 10) - (ntsc - tsc); 13898c3ba8d0SKerstin Jonsson } else 13908c3ba8d0SKerstin Jonsson max_loops--; 139142fa4250SShai Fultheim } 13928c3ba8d0SKerstin Jonsson } while (queued && max_loops > 0); 13938c3ba8d0SKerstin Jonsson WARN_ON(max_loops <= 0); 1394f62bae50SIngo Molnar 1395f62bae50SIngo Molnar /* 1396f62bae50SIngo Molnar * Now that we are all set up, enable the APIC 1397f62bae50SIngo Molnar */ 1398f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 1399f62bae50SIngo Molnar value &= ~APIC_VECTOR_MASK; 1400f62bae50SIngo Molnar /* 1401f62bae50SIngo Molnar * Enable APIC 1402f62bae50SIngo Molnar */ 1403f62bae50SIngo Molnar value |= APIC_SPIV_APIC_ENABLED; 1404f62bae50SIngo Molnar 1405f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1406f62bae50SIngo Molnar /* 1407f62bae50SIngo Molnar * Some unknown Intel IO/APIC (or APIC) errata is biting us with 1408f62bae50SIngo Molnar * certain networking cards. If high frequency interrupts are 1409f62bae50SIngo Molnar * happening on a particular IOAPIC pin, plus the IOAPIC routing 1410f62bae50SIngo Molnar * entry is masked/unmasked at a high rate as well then sooner or 1411f62bae50SIngo Molnar * later IOAPIC line gets 'stuck', no more interrupts are received 1412f62bae50SIngo Molnar * from the device. If focus CPU is disabled then the hang goes 1413f62bae50SIngo Molnar * away, oh well :-( 1414f62bae50SIngo Molnar * 1415f62bae50SIngo Molnar * [ This bug can be reproduced easily with a level-triggered 1416f62bae50SIngo Molnar * PCI Ne2000 networking cards and PII/PIII processors, dual 1417f62bae50SIngo Molnar * BX chipset. ] 1418f62bae50SIngo Molnar */ 1419f62bae50SIngo Molnar /* 1420f62bae50SIngo Molnar * Actually disabling the focus CPU check just makes the hang less 1421f62bae50SIngo Molnar * frequent as it makes the interrupt distributon model be more 1422f62bae50SIngo Molnar * like LRU than MRU (the short-term load is more even across CPUs). 1423f62bae50SIngo Molnar * See also the comment in end_level_ioapic_irq(). --macro 1424f62bae50SIngo Molnar */ 1425f62bae50SIngo Molnar 1426f62bae50SIngo Molnar /* 1427f62bae50SIngo Molnar * - enable focus processor (bit==0) 1428f62bae50SIngo Molnar * - 64bit mode always use processor focus 1429f62bae50SIngo Molnar * so no need to set it 1430f62bae50SIngo Molnar */ 1431f62bae50SIngo Molnar value &= ~APIC_SPIV_FOCUS_DISABLED; 1432f62bae50SIngo Molnar #endif 1433f62bae50SIngo Molnar 1434f62bae50SIngo Molnar /* 1435f62bae50SIngo Molnar * Set spurious IRQ vector 1436f62bae50SIngo Molnar */ 1437f62bae50SIngo Molnar value |= SPURIOUS_APIC_VECTOR; 1438f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 1439f62bae50SIngo Molnar 1440f62bae50SIngo Molnar /* 1441f62bae50SIngo Molnar * Set up LVT0, LVT1: 1442f62bae50SIngo Molnar * 1443f62bae50SIngo Molnar * set up through-local-APIC on the BP's LINT0. This is not 1444f62bae50SIngo Molnar * strictly necessary in pure symmetric-IO mode, but sometimes 1445f62bae50SIngo Molnar * we delegate interrupts to the 8259A. 1446f62bae50SIngo Molnar */ 1447f62bae50SIngo Molnar /* 1448f62bae50SIngo Molnar * TODO: set up through-local-APIC from through-I/O-APIC? --macro 1449f62bae50SIngo Molnar */ 1450f62bae50SIngo Molnar value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; 14510aa002feSTejun Heo if (!cpu && (pic_mode || !value)) { 1452f62bae50SIngo Molnar value = APIC_DM_EXTINT; 14530aa002feSTejun Heo apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu); 1454f62bae50SIngo Molnar } else { 1455f62bae50SIngo Molnar value = APIC_DM_EXTINT | APIC_LVT_MASKED; 14560aa002feSTejun Heo apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", cpu); 1457f62bae50SIngo Molnar } 1458f62bae50SIngo Molnar apic_write(APIC_LVT0, value); 1459f62bae50SIngo Molnar 1460f62bae50SIngo Molnar /* 1461f62bae50SIngo Molnar * only the BP should see the LINT1 NMI signal, obviously. 1462f62bae50SIngo Molnar */ 14630aa002feSTejun Heo if (!cpu) 1464f62bae50SIngo Molnar value = APIC_DM_NMI; 1465f62bae50SIngo Molnar else 1466f62bae50SIngo Molnar value = APIC_DM_NMI | APIC_LVT_MASKED; 1467f62bae50SIngo Molnar if (!lapic_is_integrated()) /* 82489DX */ 1468f62bae50SIngo Molnar value |= APIC_LVT_LEVEL_TRIGGER; 1469f62bae50SIngo Molnar apic_write(APIC_LVT1, value); 1470f62bae50SIngo Molnar 1471638bee71SH. Peter Anvin #ifdef CONFIG_X86_MCE_INTEL 1472638bee71SH. Peter Anvin /* Recheck CMCI information after local APIC is up on CPU #0 */ 14730aa002feSTejun Heo if (!cpu) 1474638bee71SH. Peter Anvin cmci_recheck(); 1475638bee71SH. Peter Anvin #endif 1476f62bae50SIngo Molnar } 1477f62bae50SIngo Molnar 1478148f9bb8SPaul Gortmaker void end_local_APIC_setup(void) 1479f62bae50SIngo Molnar { 1480f62bae50SIngo Molnar lapic_setup_esr(); 1481f62bae50SIngo Molnar 1482f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1483f62bae50SIngo Molnar { 1484f62bae50SIngo Molnar unsigned int value; 1485f62bae50SIngo Molnar /* Disable the local apic timer */ 1486f62bae50SIngo Molnar value = apic_read(APIC_LVTT); 1487f62bae50SIngo Molnar value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); 1488f62bae50SIngo Molnar apic_write(APIC_LVTT, value); 1489f62bae50SIngo Molnar } 1490f62bae50SIngo Molnar #endif 1491f62bae50SIngo Molnar 1492f62bae50SIngo Molnar apic_pm_activate(); 14932fb270f3SJan Beulich } 14942fb270f3SJan Beulich 14952fb270f3SJan Beulich void __init bsp_end_local_APIC_setup(void) 14962fb270f3SJan Beulich { 14972fb270f3SJan Beulich end_local_APIC_setup(); 14987f7fbf45SKenji Kaneshige 14997f7fbf45SKenji Kaneshige /* 15007f7fbf45SKenji Kaneshige * Now that local APIC setup is completed for BP, configure the fault 15017f7fbf45SKenji Kaneshige * handling for interrupt remapping. 15027f7fbf45SKenji Kaneshige */ 150395a02e97SSuresh Siddha irq_remap_enable_fault_handling(); 15047f7fbf45SKenji Kaneshige 1505f62bae50SIngo Molnar } 1506f62bae50SIngo Molnar 1507f62bae50SIngo Molnar #ifdef CONFIG_X86_X2APIC 1508fb209bd8SYinghai Lu /* 1509fb209bd8SYinghai Lu * Need to disable xapic and x2apic at the same time and then enable xapic mode 1510fb209bd8SYinghai Lu */ 1511fb209bd8SYinghai Lu static inline void __disable_x2apic(u64 msr) 1512fb209bd8SYinghai Lu { 1513fb209bd8SYinghai Lu wrmsrl(MSR_IA32_APICBASE, 1514fb209bd8SYinghai Lu msr & ~(X2APIC_ENABLE | XAPIC_ENABLE)); 1515fb209bd8SYinghai Lu wrmsrl(MSR_IA32_APICBASE, msr & ~X2APIC_ENABLE); 1516fb209bd8SYinghai Lu } 1517fb209bd8SYinghai Lu 1518a31bc327SYinghai Lu static __init void disable_x2apic(void) 1519fb209bd8SYinghai Lu { 1520fb209bd8SYinghai Lu u64 msr; 1521fb209bd8SYinghai Lu 1522fb209bd8SYinghai Lu if (!cpu_has_x2apic) 1523fb209bd8SYinghai Lu return; 1524fb209bd8SYinghai Lu 1525fb209bd8SYinghai Lu rdmsrl(MSR_IA32_APICBASE, msr); 1526fb209bd8SYinghai Lu if (msr & X2APIC_ENABLE) { 1527fb209bd8SYinghai Lu u32 x2apic_id = read_apic_id(); 1528fb209bd8SYinghai Lu 1529fb209bd8SYinghai Lu if (x2apic_id >= 255) 1530fb209bd8SYinghai Lu panic("Cannot disable x2apic, id: %08x\n", x2apic_id); 1531fb209bd8SYinghai Lu 1532fb209bd8SYinghai Lu pr_info("Disabling x2apic\n"); 1533fb209bd8SYinghai Lu __disable_x2apic(msr); 1534fb209bd8SYinghai Lu 1535a31bc327SYinghai Lu if (nox2apic) { 1536a31bc327SYinghai Lu clear_cpu_cap(&cpu_data(0), X86_FEATURE_X2APIC); 1537a31bc327SYinghai Lu setup_clear_cpu_cap(X86_FEATURE_X2APIC); 1538a31bc327SYinghai Lu } 1539a31bc327SYinghai Lu 1540fb209bd8SYinghai Lu x2apic_disabled = 1; 1541fb209bd8SYinghai Lu x2apic_mode = 0; 1542fb209bd8SYinghai Lu 1543fb209bd8SYinghai Lu register_lapic_address(mp_lapic_addr); 1544fb209bd8SYinghai Lu } 1545fb209bd8SYinghai Lu } 1546fb209bd8SYinghai Lu 1547f62bae50SIngo Molnar void check_x2apic(void) 1548f62bae50SIngo Molnar { 1549ef1f87aaSSuresh Siddha if (x2apic_enabled()) { 1550f62bae50SIngo Molnar pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); 1551fc1edaf9SSuresh Siddha x2apic_preenabled = x2apic_mode = 1; 1552f62bae50SIngo Molnar } 1553f62bae50SIngo Molnar } 1554f62bae50SIngo Molnar 1555f62bae50SIngo Molnar void enable_x2apic(void) 1556f62bae50SIngo Molnar { 1557fb209bd8SYinghai Lu u64 msr; 1558fb209bd8SYinghai Lu 1559fb209bd8SYinghai Lu rdmsrl(MSR_IA32_APICBASE, msr); 1560fb209bd8SYinghai Lu if (x2apic_disabled) { 1561fb209bd8SYinghai Lu __disable_x2apic(msr); 1562f7ccadacSThomas Gleixner x2apic_mode = 0; 1563fb209bd8SYinghai Lu return; 1564fb209bd8SYinghai Lu } 1565f62bae50SIngo Molnar 1566fc1edaf9SSuresh Siddha if (!x2apic_mode) 1567f62bae50SIngo Molnar return; 1568f62bae50SIngo Molnar 1569f62bae50SIngo Molnar if (!(msr & X2APIC_ENABLE)) { 1570450b1e8dSMike Travis printk_once(KERN_INFO "Enabling x2apic\n"); 1571fb209bd8SYinghai Lu wrmsrl(MSR_IA32_APICBASE, msr | X2APIC_ENABLE); 1572f62bae50SIngo Molnar } 1573f62bae50SIngo Molnar } 157493758238SWeidong Han #endif /* CONFIG_X86_X2APIC */ 1575f62bae50SIngo Molnar 1576ce69a784SGleb Natapov int __init enable_IR(void) 1577f62bae50SIngo Molnar { 1578d3f13810SSuresh Siddha #ifdef CONFIG_IRQ_REMAP 157995a02e97SSuresh Siddha if (!irq_remapping_supported()) { 158093758238SWeidong Han pr_debug("intr-remapping not supported\n"); 158141750d31SSuresh Siddha return -1; 158293758238SWeidong Han } 158393758238SWeidong Han 158493758238SWeidong Han if (!x2apic_preenabled && skip_ioapic_setup) { 158593758238SWeidong Han pr_info("Skipped enabling intr-remap because of skipping " 158693758238SWeidong Han "io-apic setup\n"); 158741750d31SSuresh Siddha return -1; 1588f62bae50SIngo Molnar } 1589f62bae50SIngo Molnar 159095a02e97SSuresh Siddha return irq_remapping_enable(); 1591ce69a784SGleb Natapov #endif 159241750d31SSuresh Siddha return -1; 1593ce69a784SGleb Natapov } 1594ce69a784SGleb Natapov 1595ce69a784SGleb Natapov void __init enable_IR_x2apic(void) 1596ce69a784SGleb Natapov { 1597ce69a784SGleb Natapov unsigned long flags; 1598*7f530a27SJiang Liu int ret; 1599736baef4SJoerg Roedel int hardware_init_ret; 1600b7f42ab2SYinghai Lu 16012599094fSJiang Liu if (!IS_ENABLED(CONFIG_X86_X2APIC)) { 16022599094fSJiang Liu u64 msr; 16032599094fSJiang Liu 16042599094fSJiang Liu rdmsrl(MSR_IA32_APICBASE, msr); 16052599094fSJiang Liu if (msr & X2APIC_ENABLE) 16062599094fSJiang Liu panic("BIOS has enabled x2apic but kernel doesn't support x2apic, please disable x2apic in BIOS.\n"); 16072599094fSJiang Liu } 16082599094fSJiang Liu 160995a02e97SSuresh Siddha hardware_init_ret = irq_remapping_prepare(); 1610736baef4SJoerg Roedel if (hardware_init_ret && !x2apic_supported()) 1611e670761fSYinghai Lu return; 1612ce69a784SGleb Natapov 161331dce14aSSuresh Siddha ret = save_ioapic_entries(); 1614f62bae50SIngo Molnar if (ret) { 1615f62bae50SIngo Molnar pr_info("Saving IO-APIC state failed: %d\n", ret); 1616fb209bd8SYinghai Lu return; 1617f62bae50SIngo Molnar } 1618f62bae50SIngo Molnar 161905c3dc2cSSuresh Siddha local_irq_save(flags); 1620b81bb373SJacob Pan legacy_pic->mask_all(); 162131dce14aSSuresh Siddha mask_ioapic_entries(); 162205c3dc2cSSuresh Siddha 1623a31bc327SYinghai Lu if (x2apic_preenabled && nox2apic) 1624a31bc327SYinghai Lu disable_x2apic(); 1625a31bc327SYinghai Lu 1626736baef4SJoerg Roedel if (hardware_init_ret) 162741750d31SSuresh Siddha ret = -1; 1628b7f42ab2SYinghai Lu else 1629ce69a784SGleb Natapov ret = enable_IR(); 1630b7f42ab2SYinghai Lu 1631fb209bd8SYinghai Lu if (!x2apic_supported()) 1632a31bc327SYinghai Lu goto skip_x2apic; 1633fb209bd8SYinghai Lu 163441750d31SSuresh Siddha if (ret < 0) { 1635ce69a784SGleb Natapov /* IR is required if there is APIC ID > 255 even when running 1636ce69a784SGleb Natapov * under KVM 1637ce69a784SGleb Natapov */ 16382904ed8dSSheng Yang if (max_physical_apicid > 255 || 1639fb209bd8SYinghai Lu !hypervisor_x2apic_available()) { 1640fb209bd8SYinghai Lu if (x2apic_preenabled) 1641fb209bd8SYinghai Lu disable_x2apic(); 1642a31bc327SYinghai Lu goto skip_x2apic; 1643fb209bd8SYinghai Lu } 1644ce69a784SGleb Natapov /* 1645ce69a784SGleb Natapov * without IR all CPUs can be addressed by IOAPIC/MSI 1646ce69a784SGleb Natapov * only in physical mode 1647ce69a784SGleb Natapov */ 1648ce69a784SGleb Natapov x2apic_force_phys(); 1649ce69a784SGleb Natapov } 1650f62bae50SIngo Molnar 1651fb209bd8SYinghai Lu if (ret == IRQ_REMAP_XAPIC_MODE) { 1652fb209bd8SYinghai Lu pr_info("x2apic not enabled, IRQ remapping is in xapic mode\n"); 1653a31bc327SYinghai Lu goto skip_x2apic; 1654fb209bd8SYinghai Lu } 165541750d31SSuresh Siddha 1656fc1edaf9SSuresh Siddha if (x2apic_supported() && !x2apic_mode) { 1657fc1edaf9SSuresh Siddha x2apic_mode = 1; 1658f62bae50SIngo Molnar enable_x2apic(); 165993758238SWeidong Han pr_info("Enabled x2apic\n"); 1660f62bae50SIngo Molnar } 1661f62bae50SIngo Molnar 1662a31bc327SYinghai Lu skip_x2apic: 166341750d31SSuresh Siddha if (ret < 0) /* IR enabling failed */ 166431dce14aSSuresh Siddha restore_ioapic_entries(); 1665b81bb373SJacob Pan legacy_pic->restore_mask(); 1666f62bae50SIngo Molnar local_irq_restore(flags); 1667f62bae50SIngo Molnar } 166893758238SWeidong Han 1669f62bae50SIngo Molnar #ifdef CONFIG_X86_64 1670f62bae50SIngo Molnar /* 1671f62bae50SIngo Molnar * Detect and enable local APICs on non-SMP boards. 1672f62bae50SIngo Molnar * Original code written by Keir Fraser. 1673f62bae50SIngo Molnar * On AMD64 we trust the BIOS - if it says no APIC it is likely 1674f62bae50SIngo Molnar * not correctly set up (usually the APIC timer won't work etc.) 1675f62bae50SIngo Molnar */ 1676f62bae50SIngo Molnar static int __init detect_init_APIC(void) 1677f62bae50SIngo Molnar { 1678f62bae50SIngo Molnar if (!cpu_has_apic) { 1679f62bae50SIngo Molnar pr_info("No local APIC present\n"); 1680f62bae50SIngo Molnar return -1; 1681f62bae50SIngo Molnar } 1682f62bae50SIngo Molnar 1683f62bae50SIngo Molnar mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 1684f62bae50SIngo Molnar return 0; 1685f62bae50SIngo Molnar } 1686f62bae50SIngo Molnar #else 16875a7ae78fSThomas Gleixner 168825874a29SHenrik Kretzschmar static int __init apic_verify(void) 16895a7ae78fSThomas Gleixner { 16905a7ae78fSThomas Gleixner u32 features, h, l; 16915a7ae78fSThomas Gleixner 16925a7ae78fSThomas Gleixner /* 16935a7ae78fSThomas Gleixner * The APIC feature bit should now be enabled 16945a7ae78fSThomas Gleixner * in `cpuid' 16955a7ae78fSThomas Gleixner */ 16965a7ae78fSThomas Gleixner features = cpuid_edx(1); 16975a7ae78fSThomas Gleixner if (!(features & (1 << X86_FEATURE_APIC))) { 16985a7ae78fSThomas Gleixner pr_warning("Could not enable APIC!\n"); 16995a7ae78fSThomas Gleixner return -1; 17005a7ae78fSThomas Gleixner } 17015a7ae78fSThomas Gleixner set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); 17025a7ae78fSThomas Gleixner mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 17035a7ae78fSThomas Gleixner 17045a7ae78fSThomas Gleixner /* The BIOS may have set up the APIC at some other address */ 1705cbf2829bSBryan O'Donoghue if (boot_cpu_data.x86 >= 6) { 17065a7ae78fSThomas Gleixner rdmsr(MSR_IA32_APICBASE, l, h); 17075a7ae78fSThomas Gleixner if (l & MSR_IA32_APICBASE_ENABLE) 17085a7ae78fSThomas Gleixner mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; 1709cbf2829bSBryan O'Donoghue } 17105a7ae78fSThomas Gleixner 17115a7ae78fSThomas Gleixner pr_info("Found and enabled local APIC!\n"); 17125a7ae78fSThomas Gleixner return 0; 17135a7ae78fSThomas Gleixner } 17145a7ae78fSThomas Gleixner 171525874a29SHenrik Kretzschmar int __init apic_force_enable(unsigned long addr) 17165a7ae78fSThomas Gleixner { 17175a7ae78fSThomas Gleixner u32 h, l; 17185a7ae78fSThomas Gleixner 17195a7ae78fSThomas Gleixner if (disable_apic) 17205a7ae78fSThomas Gleixner return -1; 17215a7ae78fSThomas Gleixner 17225a7ae78fSThomas Gleixner /* 17235a7ae78fSThomas Gleixner * Some BIOSes disable the local APIC in the APIC_BASE 17245a7ae78fSThomas Gleixner * MSR. This can only be done in software for Intel P6 or later 17255a7ae78fSThomas Gleixner * and AMD K7 (Model > 1) or later. 17265a7ae78fSThomas Gleixner */ 1727cbf2829bSBryan O'Donoghue if (boot_cpu_data.x86 >= 6) { 17285a7ae78fSThomas Gleixner rdmsr(MSR_IA32_APICBASE, l, h); 17295a7ae78fSThomas Gleixner if (!(l & MSR_IA32_APICBASE_ENABLE)) { 17305a7ae78fSThomas Gleixner pr_info("Local APIC disabled by BIOS -- reenabling.\n"); 17315a7ae78fSThomas Gleixner l &= ~MSR_IA32_APICBASE_BASE; 1732a906fdaaSThomas Gleixner l |= MSR_IA32_APICBASE_ENABLE | addr; 17335a7ae78fSThomas Gleixner wrmsr(MSR_IA32_APICBASE, l, h); 17345a7ae78fSThomas Gleixner enabled_via_apicbase = 1; 17355a7ae78fSThomas Gleixner } 1736cbf2829bSBryan O'Donoghue } 17375a7ae78fSThomas Gleixner return apic_verify(); 17385a7ae78fSThomas Gleixner } 17395a7ae78fSThomas Gleixner 1740f62bae50SIngo Molnar /* 1741f62bae50SIngo Molnar * Detect and initialize APIC 1742f62bae50SIngo Molnar */ 1743f62bae50SIngo Molnar static int __init detect_init_APIC(void) 1744f62bae50SIngo Molnar { 1745f62bae50SIngo Molnar /* Disabled by kernel option? */ 1746f62bae50SIngo Molnar if (disable_apic) 1747f62bae50SIngo Molnar return -1; 1748f62bae50SIngo Molnar 1749f62bae50SIngo Molnar switch (boot_cpu_data.x86_vendor) { 1750f62bae50SIngo Molnar case X86_VENDOR_AMD: 1751f62bae50SIngo Molnar if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || 1752f62bae50SIngo Molnar (boot_cpu_data.x86 >= 15)) 1753f62bae50SIngo Molnar break; 1754f62bae50SIngo Molnar goto no_apic; 1755f62bae50SIngo Molnar case X86_VENDOR_INTEL: 1756f62bae50SIngo Molnar if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || 1757f62bae50SIngo Molnar (boot_cpu_data.x86 == 5 && cpu_has_apic)) 1758f62bae50SIngo Molnar break; 1759f62bae50SIngo Molnar goto no_apic; 1760f62bae50SIngo Molnar default: 1761f62bae50SIngo Molnar goto no_apic; 1762f62bae50SIngo Molnar } 1763f62bae50SIngo Molnar 1764f62bae50SIngo Molnar if (!cpu_has_apic) { 1765f62bae50SIngo Molnar /* 1766f62bae50SIngo Molnar * Over-ride BIOS and try to enable the local APIC only if 1767f62bae50SIngo Molnar * "lapic" specified. 1768f62bae50SIngo Molnar */ 1769f62bae50SIngo Molnar if (!force_enable_local_apic) { 1770f62bae50SIngo Molnar pr_info("Local APIC disabled by BIOS -- " 1771f62bae50SIngo Molnar "you can enable it with \"lapic\"\n"); 1772f62bae50SIngo Molnar return -1; 1773f62bae50SIngo Molnar } 1774a906fdaaSThomas Gleixner if (apic_force_enable(APIC_DEFAULT_PHYS_BASE)) 17755a7ae78fSThomas Gleixner return -1; 17765a7ae78fSThomas Gleixner } else { 17775a7ae78fSThomas Gleixner if (apic_verify()) 1778f62bae50SIngo Molnar return -1; 1779f62bae50SIngo Molnar } 1780f62bae50SIngo Molnar 1781f62bae50SIngo Molnar apic_pm_activate(); 1782f62bae50SIngo Molnar 1783f62bae50SIngo Molnar return 0; 1784f62bae50SIngo Molnar 1785f62bae50SIngo Molnar no_apic: 1786f62bae50SIngo Molnar pr_info("No local APIC present or hardware disabled\n"); 1787f62bae50SIngo Molnar return -1; 1788f62bae50SIngo Molnar } 1789f62bae50SIngo Molnar #endif 1790f62bae50SIngo Molnar 1791f62bae50SIngo Molnar /** 1792f62bae50SIngo Molnar * init_apic_mappings - initialize APIC mappings 1793f62bae50SIngo Molnar */ 1794f62bae50SIngo Molnar void __init init_apic_mappings(void) 1795f62bae50SIngo Molnar { 17964401da61SYinghai Lu unsigned int new_apicid; 17974401da61SYinghai Lu 1798fc1edaf9SSuresh Siddha if (x2apic_mode) { 1799f62bae50SIngo Molnar boot_cpu_physical_apicid = read_apic_id(); 1800f62bae50SIngo Molnar return; 1801f62bae50SIngo Molnar } 1802f62bae50SIngo Molnar 18034797f6b0SYinghai Lu /* If no local APIC can be found return early */ 1804f62bae50SIngo Molnar if (!smp_found_config && detect_init_APIC()) { 18054797f6b0SYinghai Lu /* lets NOP'ify apic operations */ 18064797f6b0SYinghai Lu pr_info("APIC: disable apic facility\n"); 18074797f6b0SYinghai Lu apic_disable(); 18084797f6b0SYinghai Lu } else { 1809f62bae50SIngo Molnar apic_phys = mp_lapic_addr; 1810f62bae50SIngo Molnar 18114401da61SYinghai Lu /* 18124401da61SYinghai Lu * acpi lapic path already maps that address in 18134401da61SYinghai Lu * acpi_register_lapic_address() 18144401da61SYinghai Lu */ 18155989cd6aSEric W. Biederman if (!acpi_lapic && !smp_found_config) 1816326a2e6bSYinghai Lu register_lapic_address(apic_phys); 1817cec6be6dSCyrill Gorcunov } 1818f62bae50SIngo Molnar 1819f62bae50SIngo Molnar /* 1820f62bae50SIngo Molnar * Fetch the APIC ID of the BSP in case we have a 1821f62bae50SIngo Molnar * default configuration (or the MP table is broken). 1822f62bae50SIngo Molnar */ 18234401da61SYinghai Lu new_apicid = read_apic_id(); 18244401da61SYinghai Lu if (boot_cpu_physical_apicid != new_apicid) { 18254401da61SYinghai Lu boot_cpu_physical_apicid = new_apicid; 1826103428e5SCyrill Gorcunov /* 1827103428e5SCyrill Gorcunov * yeah -- we lie about apic_version 1828103428e5SCyrill Gorcunov * in case if apic was disabled via boot option 1829103428e5SCyrill Gorcunov * but it's not a problem for SMP compiled kernel 1830103428e5SCyrill Gorcunov * since smp_sanity_check is prepared for such a case 1831103428e5SCyrill Gorcunov * and disable smp mode 1832103428e5SCyrill Gorcunov */ 18334401da61SYinghai Lu apic_version[new_apicid] = 18344401da61SYinghai Lu GET_APIC_VERSION(apic_read(APIC_LVR)); 183508306ce6SCyrill Gorcunov } 1836f62bae50SIngo Molnar } 1837f62bae50SIngo Molnar 1838c0104d38SYinghai Lu void __init register_lapic_address(unsigned long address) 1839c0104d38SYinghai Lu { 1840c0104d38SYinghai Lu mp_lapic_addr = address; 1841c0104d38SYinghai Lu 18420450193bSYinghai Lu if (!x2apic_mode) { 1843c0104d38SYinghai Lu set_fixmap_nocache(FIX_APIC_BASE, address); 1844f1157141SYinghai Lu apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", 1845f1157141SYinghai Lu APIC_BASE, mp_lapic_addr); 18460450193bSYinghai Lu } 1847c0104d38SYinghai Lu if (boot_cpu_physical_apicid == -1U) { 1848c0104d38SYinghai Lu boot_cpu_physical_apicid = read_apic_id(); 1849c0104d38SYinghai Lu apic_version[boot_cpu_physical_apicid] = 1850c0104d38SYinghai Lu GET_APIC_VERSION(apic_read(APIC_LVR)); 1851c0104d38SYinghai Lu } 1852c0104d38SYinghai Lu } 1853c0104d38SYinghai Lu 1854f62bae50SIngo Molnar /* 1855f62bae50SIngo Molnar * This initializes the IO-APIC and APIC hardware if this is 1856f62bae50SIngo Molnar * a UP kernel. 1857f62bae50SIngo Molnar */ 185856d91f13SYinghai Lu int apic_version[MAX_LOCAL_APIC]; 1859f62bae50SIngo Molnar 1860f62bae50SIngo Molnar int __init APIC_init_uniprocessor(void) 1861f62bae50SIngo Molnar { 1862f62bae50SIngo Molnar if (disable_apic) { 1863f62bae50SIngo Molnar pr_info("Apic disabled\n"); 1864f62bae50SIngo Molnar return -1; 1865f62bae50SIngo Molnar } 1866f62bae50SIngo Molnar #ifdef CONFIG_X86_64 1867f62bae50SIngo Molnar if (!cpu_has_apic) { 1868f62bae50SIngo Molnar disable_apic = 1; 1869f62bae50SIngo Molnar pr_info("Apic disabled by BIOS\n"); 1870f62bae50SIngo Molnar return -1; 1871f62bae50SIngo Molnar } 1872f62bae50SIngo Molnar #else 1873f62bae50SIngo Molnar if (!smp_found_config && !cpu_has_apic) 1874f62bae50SIngo Molnar return -1; 1875f62bae50SIngo Molnar 1876f62bae50SIngo Molnar /* 1877f62bae50SIngo Molnar * Complain if the BIOS pretends there is one. 1878f62bae50SIngo Molnar */ 1879f62bae50SIngo Molnar if (!cpu_has_apic && 1880f62bae50SIngo Molnar APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { 1881f62bae50SIngo Molnar pr_err("BIOS bug, local APIC 0x%x not detected!...\n", 1882f62bae50SIngo Molnar boot_cpu_physical_apicid); 1883f62bae50SIngo Molnar return -1; 1884f62bae50SIngo Molnar } 1885f62bae50SIngo Molnar #endif 1886f62bae50SIngo Molnar 1887f62bae50SIngo Molnar default_setup_apic_routing(); 1888f62bae50SIngo Molnar 1889f62bae50SIngo Molnar verify_local_APIC(); 1890f62bae50SIngo Molnar connect_bsp_APIC(); 1891f62bae50SIngo Molnar 1892f62bae50SIngo Molnar #ifdef CONFIG_X86_64 1893f62bae50SIngo Molnar apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); 1894f62bae50SIngo Molnar #else 1895f62bae50SIngo Molnar /* 1896f62bae50SIngo Molnar * Hack: In case of kdump, after a crash, kernel might be booting 1897f62bae50SIngo Molnar * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid 1898f62bae50SIngo Molnar * might be zero if read from MP tables. Get it from LAPIC. 1899f62bae50SIngo Molnar */ 1900f62bae50SIngo Molnar # ifdef CONFIG_CRASH_DUMP 1901f62bae50SIngo Molnar boot_cpu_physical_apicid = read_apic_id(); 1902f62bae50SIngo Molnar # endif 1903f62bae50SIngo Molnar #endif 1904f62bae50SIngo Molnar physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); 1905f62bae50SIngo Molnar setup_local_APIC(); 1906f62bae50SIngo Molnar 1907f62bae50SIngo Molnar #ifdef CONFIG_X86_IO_APIC 1908f62bae50SIngo Molnar /* 1909f62bae50SIngo Molnar * Now enable IO-APICs, actually call clear_IO_APIC 1910f62bae50SIngo Molnar * We need clear_IO_APIC before enabling error vector 1911f62bae50SIngo Molnar */ 1912f62bae50SIngo Molnar if (!skip_ioapic_setup && nr_ioapics) 1913f62bae50SIngo Molnar enable_IO_APIC(); 1914f62bae50SIngo Molnar #endif 1915f62bae50SIngo Molnar 19162fb270f3SJan Beulich bsp_end_local_APIC_setup(); 1917f62bae50SIngo Molnar 1918f62bae50SIngo Molnar #ifdef CONFIG_X86_IO_APIC 1919f62bae50SIngo Molnar if (smp_found_config && !skip_ioapic_setup && nr_ioapics) 1920f62bae50SIngo Molnar setup_IO_APIC(); 1921f62bae50SIngo Molnar else { 1922f62bae50SIngo Molnar nr_ioapics = 0; 1923f62bae50SIngo Molnar } 1924f62bae50SIngo Molnar #endif 1925f62bae50SIngo Molnar 1926736decacSThomas Gleixner x86_init.timers.setup_percpu_clockev(); 1927f62bae50SIngo Molnar return 0; 1928f62bae50SIngo Molnar } 1929f62bae50SIngo Molnar 1930f62bae50SIngo Molnar /* 1931f62bae50SIngo Molnar * Local APIC interrupts 1932f62bae50SIngo Molnar */ 1933f62bae50SIngo Molnar 1934f62bae50SIngo Molnar /* 1935f62bae50SIngo Molnar * This interrupt should _never_ happen with our APIC/SMP architecture 1936f62bae50SIngo Molnar */ 19372414e021SJan Beulich static inline void __smp_spurious_interrupt(u8 vector) 1938f62bae50SIngo Molnar { 1939f62bae50SIngo Molnar u32 v; 1940f62bae50SIngo Molnar 1941f62bae50SIngo Molnar /* 1942f62bae50SIngo Molnar * Check if this really is a spurious interrupt and ACK it 1943f62bae50SIngo Molnar * if it is a vectored one. Just in case... 1944f62bae50SIngo Molnar * Spurious interrupts should not be ACKed. 1945f62bae50SIngo Molnar */ 19462414e021SJan Beulich v = apic_read(APIC_ISR + ((vector & ~0x1f) >> 1)); 19472414e021SJan Beulich if (v & (1 << (vector & 0x1f))) 1948f62bae50SIngo Molnar ack_APIC_irq(); 1949f62bae50SIngo Molnar 1950f62bae50SIngo Molnar inc_irq_stat(irq_spurious_count); 1951f62bae50SIngo Molnar 1952f62bae50SIngo Molnar /* see sw-dev-man vol 3, chapter 7.4.13.5 */ 19532414e021SJan Beulich pr_info("spurious APIC interrupt through vector %02x on CPU#%d, " 19542414e021SJan Beulich "should never happen.\n", vector, smp_processor_id()); 1955eddc0e92SSeiji Aguchi } 1956eddc0e92SSeiji Aguchi 19571d9090e2SAndi Kleen __visible void smp_spurious_interrupt(struct pt_regs *regs) 1958eddc0e92SSeiji Aguchi { 1959eddc0e92SSeiji Aguchi entering_irq(); 19602414e021SJan Beulich __smp_spurious_interrupt(~regs->orig_ax); 1961eddc0e92SSeiji Aguchi exiting_irq(); 1962f62bae50SIngo Molnar } 1963f62bae50SIngo Molnar 19641d9090e2SAndi Kleen __visible void smp_trace_spurious_interrupt(struct pt_regs *regs) 1965cf910e83SSeiji Aguchi { 19662414e021SJan Beulich u8 vector = ~regs->orig_ax; 19672414e021SJan Beulich 1968cf910e83SSeiji Aguchi entering_irq(); 19692414e021SJan Beulich trace_spurious_apic_entry(vector); 19702414e021SJan Beulich __smp_spurious_interrupt(vector); 19712414e021SJan Beulich trace_spurious_apic_exit(vector); 1972cf910e83SSeiji Aguchi exiting_irq(); 1973f62bae50SIngo Molnar } 1974f62bae50SIngo Molnar 1975f62bae50SIngo Molnar /* 1976f62bae50SIngo Molnar * This interrupt should never happen with our APIC/SMP architecture 1977f62bae50SIngo Molnar */ 1978eddc0e92SSeiji Aguchi static inline void __smp_error_interrupt(struct pt_regs *regs) 1979f62bae50SIngo Molnar { 198060283df7SRichard Weinberger u32 v; 19812b398bd9SYouquan Song u32 i = 0; 19822b398bd9SYouquan Song static const char * const error_interrupt_reason[] = { 19832b398bd9SYouquan Song "Send CS error", /* APIC Error Bit 0 */ 19842b398bd9SYouquan Song "Receive CS error", /* APIC Error Bit 1 */ 19852b398bd9SYouquan Song "Send accept error", /* APIC Error Bit 2 */ 19862b398bd9SYouquan Song "Receive accept error", /* APIC Error Bit 3 */ 19872b398bd9SYouquan Song "Redirectable IPI", /* APIC Error Bit 4 */ 19882b398bd9SYouquan Song "Send illegal vector", /* APIC Error Bit 5 */ 19892b398bd9SYouquan Song "Received illegal vector", /* APIC Error Bit 6 */ 19902b398bd9SYouquan Song "Illegal register address", /* APIC Error Bit 7 */ 19912b398bd9SYouquan Song }; 1992f62bae50SIngo Molnar 1993f62bae50SIngo Molnar /* First tickle the hardware, only then report what went on. -- REW */ 1994023de4a0SMaciej W. Rozycki if (lapic_get_maxlvt() > 3) /* Due to the Pentium erratum 3AP. */ 1995f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 199660283df7SRichard Weinberger v = apic_read(APIC_ESR); 1997f62bae50SIngo Molnar ack_APIC_irq(); 1998f62bae50SIngo Molnar atomic_inc(&irq_err_count); 1999f62bae50SIngo Molnar 200060283df7SRichard Weinberger apic_printk(APIC_DEBUG, KERN_DEBUG "APIC error on CPU%d: %02x", 200160283df7SRichard Weinberger smp_processor_id(), v); 20022b398bd9SYouquan Song 200360283df7SRichard Weinberger v &= 0xff; 200460283df7SRichard Weinberger while (v) { 200560283df7SRichard Weinberger if (v & 0x1) 20062b398bd9SYouquan Song apic_printk(APIC_DEBUG, KERN_CONT " : %s", error_interrupt_reason[i]); 20072b398bd9SYouquan Song i++; 200860283df7SRichard Weinberger v >>= 1; 20094b8073e4SPeter Senna Tschudin } 20102b398bd9SYouquan Song 20112b398bd9SYouquan Song apic_printk(APIC_DEBUG, KERN_CONT "\n"); 20122b398bd9SYouquan Song 2013eddc0e92SSeiji Aguchi } 2014eddc0e92SSeiji Aguchi 20151d9090e2SAndi Kleen __visible void smp_error_interrupt(struct pt_regs *regs) 2016eddc0e92SSeiji Aguchi { 2017eddc0e92SSeiji Aguchi entering_irq(); 2018eddc0e92SSeiji Aguchi __smp_error_interrupt(regs); 2019eddc0e92SSeiji Aguchi exiting_irq(); 2020f62bae50SIngo Molnar } 2021f62bae50SIngo Molnar 20221d9090e2SAndi Kleen __visible void smp_trace_error_interrupt(struct pt_regs *regs) 2023cf910e83SSeiji Aguchi { 2024cf910e83SSeiji Aguchi entering_irq(); 2025cf910e83SSeiji Aguchi trace_error_apic_entry(ERROR_APIC_VECTOR); 2026cf910e83SSeiji Aguchi __smp_error_interrupt(regs); 2027cf910e83SSeiji Aguchi trace_error_apic_exit(ERROR_APIC_VECTOR); 2028cf910e83SSeiji Aguchi exiting_irq(); 2029f62bae50SIngo Molnar } 2030f62bae50SIngo Molnar 2031f62bae50SIngo Molnar /** 2032f62bae50SIngo Molnar * connect_bsp_APIC - attach the APIC to the interrupt system 2033f62bae50SIngo Molnar */ 2034f62bae50SIngo Molnar void __init connect_bsp_APIC(void) 2035f62bae50SIngo Molnar { 2036f62bae50SIngo Molnar #ifdef CONFIG_X86_32 2037f62bae50SIngo Molnar if (pic_mode) { 2038f62bae50SIngo Molnar /* 2039f62bae50SIngo Molnar * Do not trust the local APIC being empty at bootup. 2040f62bae50SIngo Molnar */ 2041f62bae50SIngo Molnar clear_local_APIC(); 2042f62bae50SIngo Molnar /* 2043f62bae50SIngo Molnar * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's 2044f62bae50SIngo Molnar * local APIC to INT and NMI lines. 2045f62bae50SIngo Molnar */ 2046f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "leaving PIC mode, " 2047f62bae50SIngo Molnar "enabling APIC mode.\n"); 2048c0eaa453SCyrill Gorcunov imcr_pic_to_apic(); 2049f62bae50SIngo Molnar } 2050f62bae50SIngo Molnar #endif 2051f62bae50SIngo Molnar } 2052f62bae50SIngo Molnar 2053f62bae50SIngo Molnar /** 2054f62bae50SIngo Molnar * disconnect_bsp_APIC - detach the APIC from the interrupt system 2055f62bae50SIngo Molnar * @virt_wire_setup: indicates, whether virtual wire mode is selected 2056f62bae50SIngo Molnar * 2057f62bae50SIngo Molnar * Virtual wire mode is necessary to deliver legacy interrupts even when the 2058f62bae50SIngo Molnar * APIC is disabled. 2059f62bae50SIngo Molnar */ 2060f62bae50SIngo Molnar void disconnect_bsp_APIC(int virt_wire_setup) 2061f62bae50SIngo Molnar { 2062f62bae50SIngo Molnar unsigned int value; 2063f62bae50SIngo Molnar 2064f62bae50SIngo Molnar #ifdef CONFIG_X86_32 2065f62bae50SIngo Molnar if (pic_mode) { 2066f62bae50SIngo Molnar /* 2067f62bae50SIngo Molnar * Put the board back into PIC mode (has an effect only on 2068f62bae50SIngo Molnar * certain older boards). Note that APIC interrupts, including 2069f62bae50SIngo Molnar * IPIs, won't work beyond this point! The only exception are 2070f62bae50SIngo Molnar * INIT IPIs. 2071f62bae50SIngo Molnar */ 2072f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "disabling APIC mode, " 2073f62bae50SIngo Molnar "entering PIC mode.\n"); 2074c0eaa453SCyrill Gorcunov imcr_apic_to_pic(); 2075f62bae50SIngo Molnar return; 2076f62bae50SIngo Molnar } 2077f62bae50SIngo Molnar #endif 2078f62bae50SIngo Molnar 2079f62bae50SIngo Molnar /* Go back to Virtual Wire compatibility mode */ 2080f62bae50SIngo Molnar 2081f62bae50SIngo Molnar /* For the spurious interrupt use vector F, and enable it */ 2082f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 2083f62bae50SIngo Molnar value &= ~APIC_VECTOR_MASK; 2084f62bae50SIngo Molnar value |= APIC_SPIV_APIC_ENABLED; 2085f62bae50SIngo Molnar value |= 0xf; 2086f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 2087f62bae50SIngo Molnar 2088f62bae50SIngo Molnar if (!virt_wire_setup) { 2089f62bae50SIngo Molnar /* 2090f62bae50SIngo Molnar * For LVT0 make it edge triggered, active high, 2091f62bae50SIngo Molnar * external and enabled 2092f62bae50SIngo Molnar */ 2093f62bae50SIngo Molnar value = apic_read(APIC_LVT0); 2094f62bae50SIngo Molnar value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | 2095f62bae50SIngo Molnar APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | 2096f62bae50SIngo Molnar APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); 2097f62bae50SIngo Molnar value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; 2098f62bae50SIngo Molnar value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); 2099f62bae50SIngo Molnar apic_write(APIC_LVT0, value); 2100f62bae50SIngo Molnar } else { 2101f62bae50SIngo Molnar /* Disable LVT0 */ 2102f62bae50SIngo Molnar apic_write(APIC_LVT0, APIC_LVT_MASKED); 2103f62bae50SIngo Molnar } 2104f62bae50SIngo Molnar 2105f62bae50SIngo Molnar /* 2106f62bae50SIngo Molnar * For LVT1 make it edge triggered, active high, 2107f62bae50SIngo Molnar * nmi and enabled 2108f62bae50SIngo Molnar */ 2109f62bae50SIngo Molnar value = apic_read(APIC_LVT1); 2110f62bae50SIngo Molnar value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | 2111f62bae50SIngo Molnar APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | 2112f62bae50SIngo Molnar APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); 2113f62bae50SIngo Molnar value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; 2114f62bae50SIngo Molnar value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); 2115f62bae50SIngo Molnar apic_write(APIC_LVT1, value); 2116f62bae50SIngo Molnar } 2117f62bae50SIngo Molnar 21187e1f85f9SJiang Liu int generic_processor_info(int apicid, int version) 2119f62bae50SIngo Molnar { 212014cb6dcfSVivek Goyal int cpu, max = nr_cpu_ids; 212114cb6dcfSVivek Goyal bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid, 212214cb6dcfSVivek Goyal phys_cpu_present_map); 212314cb6dcfSVivek Goyal 212414cb6dcfSVivek Goyal /* 2125151e0c7dSHATAYAMA Daisuke * boot_cpu_physical_apicid is designed to have the apicid 2126151e0c7dSHATAYAMA Daisuke * returned by read_apic_id(), i.e, the apicid of the 2127151e0c7dSHATAYAMA Daisuke * currently booting-up processor. However, on some platforms, 21285b4d1dbcSH. Peter Anvin * it is temporarily modified by the apicid reported as BSP 2129151e0c7dSHATAYAMA Daisuke * through MP table. Concretely: 2130151e0c7dSHATAYAMA Daisuke * 2131151e0c7dSHATAYAMA Daisuke * - arch/x86/kernel/mpparse.c: MP_processor_info() 2132151e0c7dSHATAYAMA Daisuke * - arch/x86/mm/amdtopology.c: amd_numa_init() 2133151e0c7dSHATAYAMA Daisuke * 2134151e0c7dSHATAYAMA Daisuke * This function is executed with the modified 2135151e0c7dSHATAYAMA Daisuke * boot_cpu_physical_apicid. So, disabled_cpu_apicid kernel 2136151e0c7dSHATAYAMA Daisuke * parameter doesn't work to disable APs on kdump 2nd kernel. 2137151e0c7dSHATAYAMA Daisuke * 2138151e0c7dSHATAYAMA Daisuke * Since fixing handling of boot_cpu_physical_apicid requires 2139151e0c7dSHATAYAMA Daisuke * another discussion and tests on each platform, we leave it 2140151e0c7dSHATAYAMA Daisuke * for now and here we use read_apic_id() directly in this 2141151e0c7dSHATAYAMA Daisuke * function, generic_processor_info(). 2142151e0c7dSHATAYAMA Daisuke */ 2143151e0c7dSHATAYAMA Daisuke if (disabled_cpu_apicid != BAD_APICID && 2144151e0c7dSHATAYAMA Daisuke disabled_cpu_apicid != read_apic_id() && 2145151e0c7dSHATAYAMA Daisuke disabled_cpu_apicid == apicid) { 2146151e0c7dSHATAYAMA Daisuke int thiscpu = num_processors + disabled_cpus; 2147151e0c7dSHATAYAMA Daisuke 21485b4d1dbcSH. Peter Anvin pr_warning("APIC: Disabling requested cpu." 2149151e0c7dSHATAYAMA Daisuke " Processor %d/0x%x ignored.\n", 2150151e0c7dSHATAYAMA Daisuke thiscpu, apicid); 2151151e0c7dSHATAYAMA Daisuke 2152151e0c7dSHATAYAMA Daisuke disabled_cpus++; 2153151e0c7dSHATAYAMA Daisuke return -ENODEV; 2154151e0c7dSHATAYAMA Daisuke } 2155151e0c7dSHATAYAMA Daisuke 2156151e0c7dSHATAYAMA Daisuke /* 215714cb6dcfSVivek Goyal * If boot cpu has not been detected yet, then only allow upto 215814cb6dcfSVivek Goyal * nr_cpu_ids - 1 processors and keep one slot free for boot cpu 215914cb6dcfSVivek Goyal */ 216014cb6dcfSVivek Goyal if (!boot_cpu_detected && num_processors >= nr_cpu_ids - 1 && 216114cb6dcfSVivek Goyal apicid != boot_cpu_physical_apicid) { 216214cb6dcfSVivek Goyal int thiscpu = max + disabled_cpus - 1; 216314cb6dcfSVivek Goyal 216414cb6dcfSVivek Goyal pr_warning( 216514cb6dcfSVivek Goyal "ACPI: NR_CPUS/possible_cpus limit of %i almost" 216614cb6dcfSVivek Goyal " reached. Keeping one slot for boot cpu." 216714cb6dcfSVivek Goyal " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); 216814cb6dcfSVivek Goyal 216914cb6dcfSVivek Goyal disabled_cpus++; 21707e1f85f9SJiang Liu return -ENODEV; 217114cb6dcfSVivek Goyal } 2172f62bae50SIngo Molnar 2173f62bae50SIngo Molnar if (num_processors >= nr_cpu_ids) { 2174f62bae50SIngo Molnar int thiscpu = max + disabled_cpus; 2175f62bae50SIngo Molnar 2176f62bae50SIngo Molnar pr_warning( 2177f62bae50SIngo Molnar "ACPI: NR_CPUS/possible_cpus limit of %i reached." 2178f62bae50SIngo Molnar " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); 2179f62bae50SIngo Molnar 2180f62bae50SIngo Molnar disabled_cpus++; 21817e1f85f9SJiang Liu return -EINVAL; 2182f62bae50SIngo Molnar } 2183f62bae50SIngo Molnar 2184f62bae50SIngo Molnar num_processors++; 2185f62bae50SIngo Molnar if (apicid == boot_cpu_physical_apicid) { 2186f62bae50SIngo Molnar /* 2187f62bae50SIngo Molnar * x86_bios_cpu_apicid is required to have processors listed 2188f62bae50SIngo Molnar * in same order as logical cpu numbers. Hence the first 2189f62bae50SIngo Molnar * entry is BSP, and so on. 2190e5fea868SYinghai Lu * boot_cpu_init() already hold bit 0 in cpu_present_mask 2191e5fea868SYinghai Lu * for BSP. 2192f62bae50SIngo Molnar */ 2193f62bae50SIngo Molnar cpu = 0; 2194e5fea868SYinghai Lu } else 2195e5fea868SYinghai Lu cpu = cpumask_next_zero(-1, cpu_present_mask); 2196e5fea868SYinghai Lu 2197e5fea868SYinghai Lu /* 2198e5fea868SYinghai Lu * Validate version 2199e5fea868SYinghai Lu */ 2200e5fea868SYinghai Lu if (version == 0x0) { 2201e5fea868SYinghai Lu pr_warning("BIOS bug: APIC version is 0 for CPU %d/0x%x, fixing up to 0x10\n", 2202e5fea868SYinghai Lu cpu, apicid); 2203e5fea868SYinghai Lu version = 0x10; 2204f62bae50SIngo Molnar } 2205e5fea868SYinghai Lu apic_version[apicid] = version; 2206e5fea868SYinghai Lu 2207e5fea868SYinghai Lu if (version != apic_version[boot_cpu_physical_apicid]) { 2208e5fea868SYinghai Lu pr_warning("BIOS bug: APIC version mismatch, boot CPU: %x, CPU %d: version %x\n", 2209e5fea868SYinghai Lu apic_version[boot_cpu_physical_apicid], cpu, version); 2210e5fea868SYinghai Lu } 2211e5fea868SYinghai Lu 2212e5fea868SYinghai Lu physid_set(apicid, phys_cpu_present_map); 2213f62bae50SIngo Molnar if (apicid > max_physical_apicid) 2214f62bae50SIngo Molnar max_physical_apicid = apicid; 2215f62bae50SIngo Molnar 2216f62bae50SIngo Molnar #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) 2217f62bae50SIngo Molnar early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; 2218f62bae50SIngo Molnar early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; 2219f62bae50SIngo Molnar #endif 2220acb8bc09STejun Heo #ifdef CONFIG_X86_32 2221acb8bc09STejun Heo early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 2222acb8bc09STejun Heo apic->x86_32_early_logical_apicid(cpu); 2223acb8bc09STejun Heo #endif 2224f62bae50SIngo Molnar set_cpu_possible(cpu, true); 2225f62bae50SIngo Molnar set_cpu_present(cpu, true); 22267e1f85f9SJiang Liu 22277e1f85f9SJiang Liu return cpu; 2228f62bae50SIngo Molnar } 2229f62bae50SIngo Molnar 2230f62bae50SIngo Molnar int hard_smp_processor_id(void) 2231f62bae50SIngo Molnar { 2232f62bae50SIngo Molnar return read_apic_id(); 2233f62bae50SIngo Molnar } 2234f62bae50SIngo Molnar 2235f62bae50SIngo Molnar void default_init_apic_ldr(void) 2236f62bae50SIngo Molnar { 2237f62bae50SIngo Molnar unsigned long val; 2238f62bae50SIngo Molnar 2239f62bae50SIngo Molnar apic_write(APIC_DFR, APIC_DFR_VALUE); 2240f62bae50SIngo Molnar val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 2241f62bae50SIngo Molnar val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); 2242f62bae50SIngo Molnar apic_write(APIC_LDR, val); 2243f62bae50SIngo Molnar } 2244f62bae50SIngo Molnar 2245ff164324SAlexander Gordeev int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask, 2246ff164324SAlexander Gordeev const struct cpumask *andmask, 2247ff164324SAlexander Gordeev unsigned int *apicid) 22486398268dSAlexander Gordeev { 2249ea3807eaSAlexander Gordeev unsigned int cpu; 22506398268dSAlexander Gordeev 22516398268dSAlexander Gordeev for_each_cpu_and(cpu, cpumask, andmask) { 22526398268dSAlexander Gordeev if (cpumask_test_cpu(cpu, cpu_online_mask)) 22536398268dSAlexander Gordeev break; 22546398268dSAlexander Gordeev } 2255ff164324SAlexander Gordeev 2256ea3807eaSAlexander Gordeev if (likely(cpu < nr_cpu_ids)) { 2257a5a39156SAlexander Gordeev *apicid = per_cpu(x86_cpu_to_apicid, cpu); 2258a5a39156SAlexander Gordeev return 0; 2259a5a39156SAlexander Gordeev } 2260ea3807eaSAlexander Gordeev 2261ea3807eaSAlexander Gordeev return -EINVAL; 22626398268dSAlexander Gordeev } 22636398268dSAlexander Gordeev 2264f62bae50SIngo Molnar /* 22651551df64SMichael S. Tsirkin * Override the generic EOI implementation with an optimized version. 22661551df64SMichael S. Tsirkin * Only called during early boot when only one CPU is active and with 22671551df64SMichael S. Tsirkin * interrupts disabled, so we know this does not race with actual APIC driver 22681551df64SMichael S. Tsirkin * use. 22691551df64SMichael S. Tsirkin */ 22701551df64SMichael S. Tsirkin void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) 22711551df64SMichael S. Tsirkin { 22721551df64SMichael S. Tsirkin struct apic **drv; 22731551df64SMichael S. Tsirkin 22741551df64SMichael S. Tsirkin for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) { 22751551df64SMichael S. Tsirkin /* Should happen once for each apic */ 22761551df64SMichael S. Tsirkin WARN_ON((*drv)->eoi_write == eoi_write); 22771551df64SMichael S. Tsirkin (*drv)->eoi_write = eoi_write; 22781551df64SMichael S. Tsirkin } 22791551df64SMichael S. Tsirkin } 22801551df64SMichael S. Tsirkin 22811551df64SMichael S. Tsirkin /* 2282f62bae50SIngo Molnar * Power management 2283f62bae50SIngo Molnar */ 2284f62bae50SIngo Molnar #ifdef CONFIG_PM 2285f62bae50SIngo Molnar 2286f62bae50SIngo Molnar static struct { 2287f62bae50SIngo Molnar /* 2288f62bae50SIngo Molnar * 'active' is true if the local APIC was enabled by us and 2289f62bae50SIngo Molnar * not the BIOS; this signifies that we are also responsible 2290f62bae50SIngo Molnar * for disabling it before entering apm/acpi suspend 2291f62bae50SIngo Molnar */ 2292f62bae50SIngo Molnar int active; 2293f62bae50SIngo Molnar /* r/w apic fields */ 2294f62bae50SIngo Molnar unsigned int apic_id; 2295f62bae50SIngo Molnar unsigned int apic_taskpri; 2296f62bae50SIngo Molnar unsigned int apic_ldr; 2297f62bae50SIngo Molnar unsigned int apic_dfr; 2298f62bae50SIngo Molnar unsigned int apic_spiv; 2299f62bae50SIngo Molnar unsigned int apic_lvtt; 2300f62bae50SIngo Molnar unsigned int apic_lvtpc; 2301f62bae50SIngo Molnar unsigned int apic_lvt0; 2302f62bae50SIngo Molnar unsigned int apic_lvt1; 2303f62bae50SIngo Molnar unsigned int apic_lvterr; 2304f62bae50SIngo Molnar unsigned int apic_tmict; 2305f62bae50SIngo Molnar unsigned int apic_tdcr; 2306f62bae50SIngo Molnar unsigned int apic_thmr; 2307f62bae50SIngo Molnar } apic_pm_state; 2308f62bae50SIngo Molnar 2309f3c6ea1bSRafael J. Wysocki static int lapic_suspend(void) 2310f62bae50SIngo Molnar { 2311f62bae50SIngo Molnar unsigned long flags; 2312f62bae50SIngo Molnar int maxlvt; 2313f62bae50SIngo Molnar 2314f62bae50SIngo Molnar if (!apic_pm_state.active) 2315f62bae50SIngo Molnar return 0; 2316f62bae50SIngo Molnar 2317f62bae50SIngo Molnar maxlvt = lapic_get_maxlvt(); 2318f62bae50SIngo Molnar 2319f62bae50SIngo Molnar apic_pm_state.apic_id = apic_read(APIC_ID); 2320f62bae50SIngo Molnar apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); 2321f62bae50SIngo Molnar apic_pm_state.apic_ldr = apic_read(APIC_LDR); 2322f62bae50SIngo Molnar apic_pm_state.apic_dfr = apic_read(APIC_DFR); 2323f62bae50SIngo Molnar apic_pm_state.apic_spiv = apic_read(APIC_SPIV); 2324f62bae50SIngo Molnar apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); 2325f62bae50SIngo Molnar if (maxlvt >= 4) 2326f62bae50SIngo Molnar apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); 2327f62bae50SIngo Molnar apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); 2328f62bae50SIngo Molnar apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); 2329f62bae50SIngo Molnar apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); 2330f62bae50SIngo Molnar apic_pm_state.apic_tmict = apic_read(APIC_TMICT); 2331f62bae50SIngo Molnar apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); 23324efc0670SAndi Kleen #ifdef CONFIG_X86_THERMAL_VECTOR 2333f62bae50SIngo Molnar if (maxlvt >= 5) 2334f62bae50SIngo Molnar apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); 2335f62bae50SIngo Molnar #endif 2336f62bae50SIngo Molnar 2337f62bae50SIngo Molnar local_irq_save(flags); 2338f62bae50SIngo Molnar disable_local_APIC(); 2339fc1edaf9SSuresh Siddha 234095a02e97SSuresh Siddha irq_remapping_disable(); 2341fc1edaf9SSuresh Siddha 2342f62bae50SIngo Molnar local_irq_restore(flags); 2343f62bae50SIngo Molnar return 0; 2344f62bae50SIngo Molnar } 2345f62bae50SIngo Molnar 2346f3c6ea1bSRafael J. Wysocki static void lapic_resume(void) 2347f62bae50SIngo Molnar { 2348f62bae50SIngo Molnar unsigned int l, h; 2349f62bae50SIngo Molnar unsigned long flags; 235031dce14aSSuresh Siddha int maxlvt; 2351b24696bcSFenghua Yu 2352f62bae50SIngo Molnar if (!apic_pm_state.active) 2353f3c6ea1bSRafael J. Wysocki return; 2354f62bae50SIngo Molnar 2355b24696bcSFenghua Yu local_irq_save(flags); 2356336224baSJoerg Roedel 235731dce14aSSuresh Siddha /* 235831dce14aSSuresh Siddha * IO-APIC and PIC have their own resume routines. 235931dce14aSSuresh Siddha * We just mask them here to make sure the interrupt 236031dce14aSSuresh Siddha * subsystem is completely quiet while we enable x2apic 236131dce14aSSuresh Siddha * and interrupt-remapping. 236231dce14aSSuresh Siddha */ 236331dce14aSSuresh Siddha mask_ioapic_entries(); 2364b81bb373SJacob Pan legacy_pic->mask_all(); 2365f62bae50SIngo Molnar 2366fc1edaf9SSuresh Siddha if (x2apic_mode) 2367f62bae50SIngo Molnar enable_x2apic(); 2368cf6567feSSuresh Siddha else { 2369f62bae50SIngo Molnar /* 2370f62bae50SIngo Molnar * Make sure the APICBASE points to the right address 2371f62bae50SIngo Molnar * 2372f62bae50SIngo Molnar * FIXME! This will be wrong if we ever support suspend on 2373f62bae50SIngo Molnar * SMP! We'll need to do this as part of the CPU restore! 2374f62bae50SIngo Molnar */ 2375cbf2829bSBryan O'Donoghue if (boot_cpu_data.x86 >= 6) { 2376f62bae50SIngo Molnar rdmsr(MSR_IA32_APICBASE, l, h); 2377f62bae50SIngo Molnar l &= ~MSR_IA32_APICBASE_BASE; 2378f62bae50SIngo Molnar l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; 2379f62bae50SIngo Molnar wrmsr(MSR_IA32_APICBASE, l, h); 2380f62bae50SIngo Molnar } 2381cbf2829bSBryan O'Donoghue } 2382f62bae50SIngo Molnar 2383b24696bcSFenghua Yu maxlvt = lapic_get_maxlvt(); 2384f62bae50SIngo Molnar apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); 2385f62bae50SIngo Molnar apic_write(APIC_ID, apic_pm_state.apic_id); 2386f62bae50SIngo Molnar apic_write(APIC_DFR, apic_pm_state.apic_dfr); 2387f62bae50SIngo Molnar apic_write(APIC_LDR, apic_pm_state.apic_ldr); 2388f62bae50SIngo Molnar apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); 2389f62bae50SIngo Molnar apic_write(APIC_SPIV, apic_pm_state.apic_spiv); 2390f62bae50SIngo Molnar apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); 2391f62bae50SIngo Molnar apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); 239271c69f7fSPaul Bolle #if defined(CONFIG_X86_MCE_INTEL) 2393f62bae50SIngo Molnar if (maxlvt >= 5) 2394f62bae50SIngo Molnar apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); 2395f62bae50SIngo Molnar #endif 2396f62bae50SIngo Molnar if (maxlvt >= 4) 2397f62bae50SIngo Molnar apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); 2398f62bae50SIngo Molnar apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); 2399f62bae50SIngo Molnar apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); 2400f62bae50SIngo Molnar apic_write(APIC_TMICT, apic_pm_state.apic_tmict); 2401f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 2402f62bae50SIngo Molnar apic_read(APIC_ESR); 2403f62bae50SIngo Molnar apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); 2404f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 2405f62bae50SIngo Molnar apic_read(APIC_ESR); 2406f62bae50SIngo Molnar 240795a02e97SSuresh Siddha irq_remapping_reenable(x2apic_mode); 240831dce14aSSuresh Siddha 2409f62bae50SIngo Molnar local_irq_restore(flags); 2410f62bae50SIngo Molnar } 2411f62bae50SIngo Molnar 2412f62bae50SIngo Molnar /* 2413f62bae50SIngo Molnar * This device has no shutdown method - fully functioning local APICs 2414f62bae50SIngo Molnar * are needed on every CPU up until machine_halt/restart/poweroff. 2415f62bae50SIngo Molnar */ 2416f62bae50SIngo Molnar 2417f3c6ea1bSRafael J. Wysocki static struct syscore_ops lapic_syscore_ops = { 2418f62bae50SIngo Molnar .resume = lapic_resume, 2419f62bae50SIngo Molnar .suspend = lapic_suspend, 2420f62bae50SIngo Molnar }; 2421f62bae50SIngo Molnar 2422148f9bb8SPaul Gortmaker static void apic_pm_activate(void) 2423f62bae50SIngo Molnar { 2424f62bae50SIngo Molnar apic_pm_state.active = 1; 2425f62bae50SIngo Molnar } 2426f62bae50SIngo Molnar 2427f62bae50SIngo Molnar static int __init init_lapic_sysfs(void) 2428f62bae50SIngo Molnar { 2429f62bae50SIngo Molnar /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ 2430f3c6ea1bSRafael J. Wysocki if (cpu_has_apic) 2431f3c6ea1bSRafael J. Wysocki register_syscore_ops(&lapic_syscore_ops); 2432f62bae50SIngo Molnar 2433f3c6ea1bSRafael J. Wysocki return 0; 2434f62bae50SIngo Molnar } 2435b24696bcSFenghua Yu 2436b24696bcSFenghua Yu /* local apic needs to resume before other devices access its registers. */ 2437b24696bcSFenghua Yu core_initcall(init_lapic_sysfs); 2438f62bae50SIngo Molnar 2439f62bae50SIngo Molnar #else /* CONFIG_PM */ 2440f62bae50SIngo Molnar 2441f62bae50SIngo Molnar static void apic_pm_activate(void) { } 2442f62bae50SIngo Molnar 2443f62bae50SIngo Molnar #endif /* CONFIG_PM */ 2444f62bae50SIngo Molnar 2445f62bae50SIngo Molnar #ifdef CONFIG_X86_64 2446e0e42142SYinghai Lu 2447148f9bb8SPaul Gortmaker static int multi_checked; 2448148f9bb8SPaul Gortmaker static int multi; 2449e0e42142SYinghai Lu 2450148f9bb8SPaul Gortmaker static int set_multi(const struct dmi_system_id *d) 2451e0e42142SYinghai Lu { 2452e0e42142SYinghai Lu if (multi) 2453e0e42142SYinghai Lu return 0; 24546f0aced6SCyrill Gorcunov pr_info("APIC: %s detected, Multi Chassis\n", d->ident); 2455e0e42142SYinghai Lu multi = 1; 2456e0e42142SYinghai Lu return 0; 2457e0e42142SYinghai Lu } 2458e0e42142SYinghai Lu 2459148f9bb8SPaul Gortmaker static const struct dmi_system_id multi_dmi_table[] = { 2460e0e42142SYinghai Lu { 2461e0e42142SYinghai Lu .callback = set_multi, 2462e0e42142SYinghai Lu .ident = "IBM System Summit2", 2463e0e42142SYinghai Lu .matches = { 2464e0e42142SYinghai Lu DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2465e0e42142SYinghai Lu DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"), 2466e0e42142SYinghai Lu }, 2467e0e42142SYinghai Lu }, 2468e0e42142SYinghai Lu {} 2469e0e42142SYinghai Lu }; 2470e0e42142SYinghai Lu 2471148f9bb8SPaul Gortmaker static void dmi_check_multi(void) 2472e0e42142SYinghai Lu { 2473e0e42142SYinghai Lu if (multi_checked) 2474e0e42142SYinghai Lu return; 2475e0e42142SYinghai Lu 2476e0e42142SYinghai Lu dmi_check_system(multi_dmi_table); 2477e0e42142SYinghai Lu multi_checked = 1; 2478e0e42142SYinghai Lu } 2479f62bae50SIngo Molnar 2480f62bae50SIngo Molnar /* 2481e0e42142SYinghai Lu * apic_is_clustered_box() -- Check if we can expect good TSC 2482e0e42142SYinghai Lu * 2483e0e42142SYinghai Lu * Thus far, the major user of this is IBM's Summit2 series: 2484e0e42142SYinghai Lu * Clustered boxes may have unsynced TSC problems if they are 2485e0e42142SYinghai Lu * multi-chassis. 2486e0e42142SYinghai Lu * Use DMI to check them 2487f62bae50SIngo Molnar */ 2488148f9bb8SPaul Gortmaker int apic_is_clustered_box(void) 2489e0e42142SYinghai Lu { 2490e0e42142SYinghai Lu dmi_check_multi(); 2491411cf9eeSOren Twaig return multi; 2492f62bae50SIngo Molnar } 2493f62bae50SIngo Molnar #endif 2494f62bae50SIngo Molnar 2495f62bae50SIngo Molnar /* 2496f62bae50SIngo Molnar * APIC command line parameters 2497f62bae50SIngo Molnar */ 2498f62bae50SIngo Molnar static int __init setup_disableapic(char *arg) 2499f62bae50SIngo Molnar { 2500f62bae50SIngo Molnar disable_apic = 1; 2501f62bae50SIngo Molnar setup_clear_cpu_cap(X86_FEATURE_APIC); 2502f62bae50SIngo Molnar return 0; 2503f62bae50SIngo Molnar } 2504f62bae50SIngo Molnar early_param("disableapic", setup_disableapic); 2505f62bae50SIngo Molnar 2506f62bae50SIngo Molnar /* same as disableapic, for compatibility */ 2507f62bae50SIngo Molnar static int __init setup_nolapic(char *arg) 2508f62bae50SIngo Molnar { 2509f62bae50SIngo Molnar return setup_disableapic(arg); 2510f62bae50SIngo Molnar } 2511f62bae50SIngo Molnar early_param("nolapic", setup_nolapic); 2512f62bae50SIngo Molnar 2513f62bae50SIngo Molnar static int __init parse_lapic_timer_c2_ok(char *arg) 2514f62bae50SIngo Molnar { 2515f62bae50SIngo Molnar local_apic_timer_c2_ok = 1; 2516f62bae50SIngo Molnar return 0; 2517f62bae50SIngo Molnar } 2518f62bae50SIngo Molnar early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); 2519f62bae50SIngo Molnar 2520f62bae50SIngo Molnar static int __init parse_disable_apic_timer(char *arg) 2521f62bae50SIngo Molnar { 2522f62bae50SIngo Molnar disable_apic_timer = 1; 2523f62bae50SIngo Molnar return 0; 2524f62bae50SIngo Molnar } 2525f62bae50SIngo Molnar early_param("noapictimer", parse_disable_apic_timer); 2526f62bae50SIngo Molnar 2527f62bae50SIngo Molnar static int __init parse_nolapic_timer(char *arg) 2528f62bae50SIngo Molnar { 2529f62bae50SIngo Molnar disable_apic_timer = 1; 2530f62bae50SIngo Molnar return 0; 2531f62bae50SIngo Molnar } 2532f62bae50SIngo Molnar early_param("nolapic_timer", parse_nolapic_timer); 2533f62bae50SIngo Molnar 2534f62bae50SIngo Molnar static int __init apic_set_verbosity(char *arg) 2535f62bae50SIngo Molnar { 2536f62bae50SIngo Molnar if (!arg) { 2537f62bae50SIngo Molnar #ifdef CONFIG_X86_64 2538f62bae50SIngo Molnar skip_ioapic_setup = 0; 2539f62bae50SIngo Molnar return 0; 2540f62bae50SIngo Molnar #endif 2541f62bae50SIngo Molnar return -EINVAL; 2542f62bae50SIngo Molnar } 2543f62bae50SIngo Molnar 2544f62bae50SIngo Molnar if (strcmp("debug", arg) == 0) 2545f62bae50SIngo Molnar apic_verbosity = APIC_DEBUG; 2546f62bae50SIngo Molnar else if (strcmp("verbose", arg) == 0) 2547f62bae50SIngo Molnar apic_verbosity = APIC_VERBOSE; 2548f62bae50SIngo Molnar else { 2549f62bae50SIngo Molnar pr_warning("APIC Verbosity level %s not recognised" 2550f62bae50SIngo Molnar " use apic=verbose or apic=debug\n", arg); 2551f62bae50SIngo Molnar return -EINVAL; 2552f62bae50SIngo Molnar } 2553f62bae50SIngo Molnar 2554f62bae50SIngo Molnar return 0; 2555f62bae50SIngo Molnar } 2556f62bae50SIngo Molnar early_param("apic", apic_set_verbosity); 2557f62bae50SIngo Molnar 2558f62bae50SIngo Molnar static int __init lapic_insert_resource(void) 2559f62bae50SIngo Molnar { 2560f62bae50SIngo Molnar if (!apic_phys) 2561f62bae50SIngo Molnar return -1; 2562f62bae50SIngo Molnar 2563f62bae50SIngo Molnar /* Put local APIC into the resource map. */ 2564f62bae50SIngo Molnar lapic_resource.start = apic_phys; 2565f62bae50SIngo Molnar lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; 2566f62bae50SIngo Molnar insert_resource(&iomem_resource, &lapic_resource); 2567f62bae50SIngo Molnar 2568f62bae50SIngo Molnar return 0; 2569f62bae50SIngo Molnar } 2570f62bae50SIngo Molnar 2571f62bae50SIngo Molnar /* 2572f62bae50SIngo Molnar * need call insert after e820_reserve_resources() 2573f62bae50SIngo Molnar * that is using request_resource 2574f62bae50SIngo Molnar */ 2575f62bae50SIngo Molnar late_initcall(lapic_insert_resource); 2576151e0c7dSHATAYAMA Daisuke 2577151e0c7dSHATAYAMA Daisuke static int __init apic_set_disabled_cpu_apicid(char *arg) 2578151e0c7dSHATAYAMA Daisuke { 2579151e0c7dSHATAYAMA Daisuke if (!arg || !get_option(&arg, &disabled_cpu_apicid)) 2580151e0c7dSHATAYAMA Daisuke return -EINVAL; 2581151e0c7dSHATAYAMA Daisuke 2582151e0c7dSHATAYAMA Daisuke return 0; 2583151e0c7dSHATAYAMA Daisuke } 2584151e0c7dSHATAYAMA Daisuke early_param("disable_cpu_apicid", apic_set_disabled_cpu_apicid); 2585