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 38cdd6c482SIngo Molnar #include <asm/perf_event.h> 39736decacSThomas Gleixner #include <asm/x86_init.h> 40f62bae50SIngo Molnar #include <asm/pgalloc.h> 4160063497SArun Sharma #include <linux/atomic.h> 42f62bae50SIngo Molnar #include <asm/mpspec.h> 43f62bae50SIngo Molnar #include <asm/i8259.h> 44f62bae50SIngo Molnar #include <asm/proto.h> 45f62bae50SIngo Molnar #include <asm/apic.h> 467167d08eSHenrik Kretzschmar #include <asm/io_apic.h> 47f62bae50SIngo Molnar #include <asm/desc.h> 48f62bae50SIngo Molnar #include <asm/hpet.h> 49f62bae50SIngo Molnar #include <asm/idle.h> 50f62bae50SIngo Molnar #include <asm/mtrr.h> 5116f871bcSRalf Baechle #include <asm/time.h> 52f62bae50SIngo Molnar #include <asm/smp.h> 53638bee71SH. Peter Anvin #include <asm/mce.h> 548c3ba8d0SKerstin Jonsson #include <asm/tsc.h> 552904ed8dSSheng Yang #include <asm/hypervisor.h> 56f62bae50SIngo Molnar 57f62bae50SIngo Molnar unsigned int num_processors; 58f62bae50SIngo Molnar 59f62bae50SIngo Molnar unsigned disabled_cpus __cpuinitdata; 60f62bae50SIngo Molnar 61f62bae50SIngo Molnar /* Processor that is doing the boot up */ 62f62bae50SIngo Molnar unsigned int boot_cpu_physical_apicid = -1U; 63f62bae50SIngo Molnar 64f62bae50SIngo Molnar /* 65f62bae50SIngo Molnar * The highest APIC ID seen during enumeration. 66f62bae50SIngo Molnar */ 67f62bae50SIngo Molnar unsigned int max_physical_apicid; 68f62bae50SIngo Molnar 69f62bae50SIngo Molnar /* 70f62bae50SIngo Molnar * Bitmask of physically existing CPUs: 71f62bae50SIngo Molnar */ 72f62bae50SIngo Molnar physid_mask_t phys_cpu_present_map; 73f62bae50SIngo Molnar 74f62bae50SIngo Molnar /* 75f62bae50SIngo Molnar * Map cpu index to physical APIC ID 76f62bae50SIngo Molnar */ 77f62bae50SIngo Molnar DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID); 78f62bae50SIngo Molnar DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID); 79f62bae50SIngo Molnar EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); 80f62bae50SIngo Molnar EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); 81f62bae50SIngo Molnar 82f62bae50SIngo Molnar #ifdef CONFIG_X86_32 834c321ff8STejun Heo 844c321ff8STejun Heo /* 854c321ff8STejun Heo * On x86_32, the mapping between cpu and logical apicid may vary 864c321ff8STejun Heo * depending on apic in use. The following early percpu variable is 874c321ff8STejun Heo * used for the mapping. This is where the behaviors of x86_64 and 32 884c321ff8STejun Heo * actually diverge. Let's keep it ugly for now. 894c321ff8STejun Heo */ 904c321ff8STejun Heo DEFINE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid, BAD_APICID); 914c321ff8STejun Heo 92f62bae50SIngo Molnar /* 93f62bae50SIngo Molnar * Knob to control our willingness to enable the local APIC. 94f62bae50SIngo Molnar * 95f62bae50SIngo Molnar * +1=force-enable 96f62bae50SIngo Molnar */ 9725874a29SHenrik Kretzschmar static int force_enable_local_apic __initdata; 98f62bae50SIngo Molnar /* 99f62bae50SIngo Molnar * APIC command line parameters 100f62bae50SIngo Molnar */ 101f62bae50SIngo Molnar static int __init parse_lapic(char *arg) 102f62bae50SIngo Molnar { 103f62bae50SIngo Molnar force_enable_local_apic = 1; 104f62bae50SIngo Molnar return 0; 105f62bae50SIngo Molnar } 106f62bae50SIngo Molnar early_param("lapic", parse_lapic); 107f62bae50SIngo Molnar /* Local APIC was disabled by the BIOS and enabled by the kernel */ 108f62bae50SIngo Molnar static int enabled_via_apicbase; 109f62bae50SIngo Molnar 110c0eaa453SCyrill Gorcunov /* 111c0eaa453SCyrill Gorcunov * Handle interrupt mode configuration register (IMCR). 112c0eaa453SCyrill Gorcunov * This register controls whether the interrupt signals 113c0eaa453SCyrill Gorcunov * that reach the BSP come from the master PIC or from the 114c0eaa453SCyrill Gorcunov * local APIC. Before entering Symmetric I/O Mode, either 115c0eaa453SCyrill Gorcunov * the BIOS or the operating system must switch out of 116c0eaa453SCyrill Gorcunov * PIC Mode by changing the IMCR. 117c0eaa453SCyrill Gorcunov */ 1185cda395fSAlexander van Heukelum static inline void imcr_pic_to_apic(void) 119c0eaa453SCyrill Gorcunov { 120c0eaa453SCyrill Gorcunov /* select IMCR register */ 121c0eaa453SCyrill Gorcunov outb(0x70, 0x22); 122c0eaa453SCyrill Gorcunov /* NMI and 8259 INTR go through APIC */ 123c0eaa453SCyrill Gorcunov outb(0x01, 0x23); 124c0eaa453SCyrill Gorcunov } 125c0eaa453SCyrill Gorcunov 1265cda395fSAlexander van Heukelum static inline void imcr_apic_to_pic(void) 127c0eaa453SCyrill Gorcunov { 128c0eaa453SCyrill Gorcunov /* select IMCR register */ 129c0eaa453SCyrill Gorcunov outb(0x70, 0x22); 130c0eaa453SCyrill Gorcunov /* NMI and 8259 INTR go directly to BSP */ 131c0eaa453SCyrill Gorcunov outb(0x00, 0x23); 132c0eaa453SCyrill Gorcunov } 133f62bae50SIngo Molnar #endif 134f62bae50SIngo Molnar 135f62bae50SIngo Molnar #ifdef CONFIG_X86_64 136f62bae50SIngo Molnar static int apic_calibrate_pmtmr __initdata; 137f62bae50SIngo Molnar static __init int setup_apicpmtimer(char *s) 138f62bae50SIngo Molnar { 139f62bae50SIngo Molnar apic_calibrate_pmtmr = 1; 140f62bae50SIngo Molnar notsc_setup(NULL); 141f62bae50SIngo Molnar return 0; 142f62bae50SIngo Molnar } 143f62bae50SIngo Molnar __setup("apicpmtimer", setup_apicpmtimer); 144f62bae50SIngo Molnar #endif 145f62bae50SIngo Molnar 146fc1edaf9SSuresh Siddha int x2apic_mode; 147f62bae50SIngo Molnar #ifdef CONFIG_X86_X2APIC 148f62bae50SIngo Molnar /* x2apic enabled before OS handover */ 149f62bae50SIngo Molnar static int x2apic_preenabled; 150f62bae50SIngo Molnar static __init int setup_nox2apic(char *str) 151f62bae50SIngo Molnar { 15239d83a5dSSuresh Siddha if (x2apic_enabled()) { 15339d83a5dSSuresh Siddha pr_warning("Bios already enabled x2apic, " 15439d83a5dSSuresh Siddha "can't enforce nox2apic"); 15539d83a5dSSuresh Siddha return 0; 15639d83a5dSSuresh Siddha } 15739d83a5dSSuresh Siddha 158f62bae50SIngo Molnar setup_clear_cpu_cap(X86_FEATURE_X2APIC); 159f62bae50SIngo Molnar return 0; 160f62bae50SIngo Molnar } 161f62bae50SIngo Molnar early_param("nox2apic", setup_nox2apic); 162f62bae50SIngo Molnar #endif 163f62bae50SIngo Molnar 164f62bae50SIngo Molnar unsigned long mp_lapic_addr; 165f62bae50SIngo Molnar int disable_apic; 166f62bae50SIngo Molnar /* Disable local APIC timer from the kernel commandline or via dmi quirk */ 16725874a29SHenrik Kretzschmar static int disable_apic_timer __initdata; 168f62bae50SIngo Molnar /* Local APIC timer works in C2 */ 169f62bae50SIngo Molnar int local_apic_timer_c2_ok; 170f62bae50SIngo Molnar EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); 171f62bae50SIngo Molnar 172f62bae50SIngo Molnar int first_system_vector = 0xfe; 173f62bae50SIngo Molnar 174f62bae50SIngo Molnar /* 175f62bae50SIngo Molnar * Debug level, exported for io_apic.c 176f62bae50SIngo Molnar */ 177f62bae50SIngo Molnar unsigned int apic_verbosity; 178f62bae50SIngo Molnar 179f62bae50SIngo Molnar int pic_mode; 180f62bae50SIngo Molnar 181f62bae50SIngo Molnar /* Have we found an MP table */ 182f62bae50SIngo Molnar int smp_found_config; 183f62bae50SIngo Molnar 184f62bae50SIngo Molnar static struct resource lapic_resource = { 185f62bae50SIngo Molnar .name = "Local APIC", 186f62bae50SIngo Molnar .flags = IORESOURCE_MEM | IORESOURCE_BUSY, 187f62bae50SIngo Molnar }; 188f62bae50SIngo Molnar 1891ade93efSJacob Pan unsigned int lapic_timer_frequency = 0; 190f62bae50SIngo Molnar 191f62bae50SIngo Molnar static void apic_pm_activate(void); 192f62bae50SIngo Molnar 193f62bae50SIngo Molnar static unsigned long apic_phys; 194f62bae50SIngo Molnar 195f62bae50SIngo Molnar /* 196f62bae50SIngo Molnar * Get the LAPIC version 197f62bae50SIngo Molnar */ 198f62bae50SIngo Molnar static inline int lapic_get_version(void) 199f62bae50SIngo Molnar { 200f62bae50SIngo Molnar return GET_APIC_VERSION(apic_read(APIC_LVR)); 201f62bae50SIngo Molnar } 202f62bae50SIngo Molnar 203f62bae50SIngo Molnar /* 204f62bae50SIngo Molnar * Check, if the APIC is integrated or a separate chip 205f62bae50SIngo Molnar */ 206f62bae50SIngo Molnar static inline int lapic_is_integrated(void) 207f62bae50SIngo Molnar { 208f62bae50SIngo Molnar #ifdef CONFIG_X86_64 209f62bae50SIngo Molnar return 1; 210f62bae50SIngo Molnar #else 211f62bae50SIngo Molnar return APIC_INTEGRATED(lapic_get_version()); 212f62bae50SIngo Molnar #endif 213f62bae50SIngo Molnar } 214f62bae50SIngo Molnar 215f62bae50SIngo Molnar /* 216f62bae50SIngo Molnar * Check, whether this is a modern or a first generation APIC 217f62bae50SIngo Molnar */ 218f62bae50SIngo Molnar static int modern_apic(void) 219f62bae50SIngo Molnar { 220f62bae50SIngo Molnar /* AMD systems use old APIC versions, so check the CPU */ 221f62bae50SIngo Molnar if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && 222f62bae50SIngo Molnar boot_cpu_data.x86 >= 0xf) 223f62bae50SIngo Molnar return 1; 224f62bae50SIngo Molnar return lapic_get_version() >= 0x14; 225f62bae50SIngo Molnar } 226f62bae50SIngo Molnar 22708306ce6SCyrill Gorcunov /* 228a933c618SCyrill Gorcunov * right after this call apic become NOOP driven 229a933c618SCyrill Gorcunov * so apic->write/read doesn't do anything 23008306ce6SCyrill Gorcunov */ 23125874a29SHenrik Kretzschmar static void __init apic_disable(void) 23208306ce6SCyrill Gorcunov { 233f88f2b4fSCyrill Gorcunov pr_info("APIC: switched to apic NOOP\n"); 234a933c618SCyrill Gorcunov apic = &apic_noop; 23508306ce6SCyrill Gorcunov } 23608306ce6SCyrill Gorcunov 237f62bae50SIngo Molnar void native_apic_wait_icr_idle(void) 238f62bae50SIngo Molnar { 239f62bae50SIngo Molnar while (apic_read(APIC_ICR) & APIC_ICR_BUSY) 240f62bae50SIngo Molnar cpu_relax(); 241f62bae50SIngo Molnar } 242f62bae50SIngo Molnar 243f62bae50SIngo Molnar u32 native_safe_apic_wait_icr_idle(void) 244f62bae50SIngo Molnar { 245f62bae50SIngo Molnar u32 send_status; 246f62bae50SIngo Molnar int timeout; 247f62bae50SIngo Molnar 248f62bae50SIngo Molnar timeout = 0; 249f62bae50SIngo Molnar do { 250f62bae50SIngo Molnar send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; 251f62bae50SIngo Molnar if (!send_status) 252f62bae50SIngo Molnar break; 253*b49d7d87SFernando Luis Vazquez Cao inc_irq_stat(icr_read_retry_count); 254f62bae50SIngo Molnar udelay(100); 255f62bae50SIngo Molnar } while (timeout++ < 1000); 256f62bae50SIngo Molnar 257f62bae50SIngo Molnar return send_status; 258f62bae50SIngo Molnar } 259f62bae50SIngo Molnar 260f62bae50SIngo Molnar void native_apic_icr_write(u32 low, u32 id) 261f62bae50SIngo Molnar { 262f62bae50SIngo Molnar apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); 263f62bae50SIngo Molnar apic_write(APIC_ICR, low); 264f62bae50SIngo Molnar } 265f62bae50SIngo Molnar 266f62bae50SIngo Molnar u64 native_apic_icr_read(void) 267f62bae50SIngo Molnar { 268f62bae50SIngo Molnar u32 icr1, icr2; 269f62bae50SIngo Molnar 270f62bae50SIngo Molnar icr2 = apic_read(APIC_ICR2); 271f62bae50SIngo Molnar icr1 = apic_read(APIC_ICR); 272f62bae50SIngo Molnar 273f62bae50SIngo Molnar return icr1 | ((u64)icr2 << 32); 274f62bae50SIngo Molnar } 275f62bae50SIngo Molnar 276f62bae50SIngo Molnar #ifdef CONFIG_X86_32 277f62bae50SIngo Molnar /** 278f62bae50SIngo Molnar * get_physical_broadcast - Get number of physical broadcast IDs 279f62bae50SIngo Molnar */ 280f62bae50SIngo Molnar int get_physical_broadcast(void) 281f62bae50SIngo Molnar { 282f62bae50SIngo Molnar return modern_apic() ? 0xff : 0xf; 283f62bae50SIngo Molnar } 284f62bae50SIngo Molnar #endif 285f62bae50SIngo Molnar 286f62bae50SIngo Molnar /** 287f62bae50SIngo Molnar * lapic_get_maxlvt - get the maximum number of local vector table entries 288f62bae50SIngo Molnar */ 289f62bae50SIngo Molnar int lapic_get_maxlvt(void) 290f62bae50SIngo Molnar { 291f62bae50SIngo Molnar unsigned int v; 292f62bae50SIngo Molnar 293f62bae50SIngo Molnar v = apic_read(APIC_LVR); 294f62bae50SIngo Molnar /* 295f62bae50SIngo Molnar * - we always have APIC integrated on 64bit mode 296f62bae50SIngo Molnar * - 82489DXs do not report # of LVT entries 297f62bae50SIngo Molnar */ 298f62bae50SIngo Molnar return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; 299f62bae50SIngo Molnar } 300f62bae50SIngo Molnar 301f62bae50SIngo Molnar /* 302f62bae50SIngo Molnar * Local APIC timer 303f62bae50SIngo Molnar */ 304f62bae50SIngo Molnar 305f62bae50SIngo Molnar /* Clock divisor */ 306f62bae50SIngo Molnar #define APIC_DIVISOR 16 307f62bae50SIngo Molnar 308f62bae50SIngo Molnar /* 309f62bae50SIngo Molnar * This function sets up the local APIC timer, with a timeout of 310f62bae50SIngo Molnar * 'clocks' APIC bus clock. During calibration we actually call 311f62bae50SIngo Molnar * this function twice on the boot CPU, once with a bogus timeout 312f62bae50SIngo Molnar * value, second time for real. The other (noncalibrating) CPUs 313f62bae50SIngo Molnar * call this function only once, with the real, calibrated value. 314f62bae50SIngo Molnar * 315f62bae50SIngo Molnar * We do reads before writes even if unnecessary, to get around the 316f62bae50SIngo Molnar * P5 APIC double write bug. 317f62bae50SIngo Molnar */ 318f62bae50SIngo Molnar static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) 319f62bae50SIngo Molnar { 320f62bae50SIngo Molnar unsigned int lvtt_value, tmp_value; 321f62bae50SIngo Molnar 322f62bae50SIngo Molnar lvtt_value = LOCAL_TIMER_VECTOR; 323f62bae50SIngo Molnar if (!oneshot) 324f62bae50SIngo Molnar lvtt_value |= APIC_LVT_TIMER_PERIODIC; 325f62bae50SIngo Molnar if (!lapic_is_integrated()) 326f62bae50SIngo Molnar lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); 327f62bae50SIngo Molnar 328f62bae50SIngo Molnar if (!irqen) 329f62bae50SIngo Molnar lvtt_value |= APIC_LVT_MASKED; 330f62bae50SIngo Molnar 331f62bae50SIngo Molnar apic_write(APIC_LVTT, lvtt_value); 332f62bae50SIngo Molnar 333f62bae50SIngo Molnar /* 334f62bae50SIngo Molnar * Divide PICLK by 16 335f62bae50SIngo Molnar */ 336f62bae50SIngo Molnar tmp_value = apic_read(APIC_TDCR); 337f62bae50SIngo Molnar apic_write(APIC_TDCR, 338f62bae50SIngo Molnar (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | 339f62bae50SIngo Molnar APIC_TDR_DIV_16); 340f62bae50SIngo Molnar 341f62bae50SIngo Molnar if (!oneshot) 342f62bae50SIngo Molnar apic_write(APIC_TMICT, clocks / APIC_DIVISOR); 343f62bae50SIngo Molnar } 344f62bae50SIngo Molnar 345f62bae50SIngo Molnar /* 346a68c439bSRobert Richter * Setup extended LVT, AMD specific 347f62bae50SIngo Molnar * 348a68c439bSRobert Richter * Software should use the LVT offsets the BIOS provides. The offsets 349a68c439bSRobert Richter * are determined by the subsystems using it like those for MCE 350a68c439bSRobert Richter * threshold or IBS. On K8 only offset 0 (APIC500) and MCE interrupts 351a68c439bSRobert Richter * are supported. Beginning with family 10h at least 4 offsets are 352a68c439bSRobert Richter * available. 353f62bae50SIngo Molnar * 354a68c439bSRobert Richter * Since the offsets must be consistent for all cores, we keep track 355a68c439bSRobert Richter * of the LVT offsets in software and reserve the offset for the same 356a68c439bSRobert Richter * vector also to be used on other cores. An offset is freed by 357a68c439bSRobert Richter * setting the entry to APIC_EILVT_MASKED. 358a68c439bSRobert Richter * 359a68c439bSRobert Richter * If the BIOS is right, there should be no conflicts. Otherwise a 360a68c439bSRobert Richter * "[Firmware Bug]: ..." error message is generated. However, if 361a68c439bSRobert Richter * software does not properly determines the offsets, it is not 362a68c439bSRobert Richter * necessarily a BIOS bug. 363f62bae50SIngo Molnar */ 364f62bae50SIngo Molnar 365a68c439bSRobert Richter static atomic_t eilvt_offsets[APIC_EILVT_NR_MAX]; 366f62bae50SIngo Molnar 367a68c439bSRobert Richter static inline int eilvt_entry_is_changeable(unsigned int old, unsigned int new) 368a68c439bSRobert Richter { 369a68c439bSRobert Richter return (old & APIC_EILVT_MASKED) 370a68c439bSRobert Richter || (new == APIC_EILVT_MASKED) 371a68c439bSRobert Richter || ((new & ~APIC_EILVT_MASKED) == old); 372a68c439bSRobert Richter } 373a68c439bSRobert Richter 374a68c439bSRobert Richter static unsigned int reserve_eilvt_offset(int offset, unsigned int new) 375a68c439bSRobert Richter { 376a68c439bSRobert Richter unsigned int rsvd; /* 0: uninitialized */ 377a68c439bSRobert Richter 378a68c439bSRobert Richter if (offset >= APIC_EILVT_NR_MAX) 379a68c439bSRobert Richter return ~0; 380a68c439bSRobert Richter 381a68c439bSRobert Richter rsvd = atomic_read(&eilvt_offsets[offset]) & ~APIC_EILVT_MASKED; 382a68c439bSRobert Richter do { 383a68c439bSRobert Richter if (rsvd && 384a68c439bSRobert Richter !eilvt_entry_is_changeable(rsvd, new)) 385a68c439bSRobert Richter /* may not change if vectors are different */ 386a68c439bSRobert Richter return rsvd; 387a68c439bSRobert Richter rsvd = atomic_cmpxchg(&eilvt_offsets[offset], rsvd, new); 388a68c439bSRobert Richter } while (rsvd != new); 389a68c439bSRobert Richter 390a68c439bSRobert Richter return new; 391a68c439bSRobert Richter } 392a68c439bSRobert Richter 393a68c439bSRobert Richter /* 394a68c439bSRobert Richter * If mask=1, the LVT entry does not generate interrupts while mask=0 395cbf74ceaSRobert Richter * enables the vector. See also the BKDGs. Must be called with 396cbf74ceaSRobert Richter * preemption disabled. 397a68c439bSRobert Richter */ 398a68c439bSRobert Richter 39927afdf20SRobert Richter int setup_APIC_eilvt(u8 offset, u8 vector, u8 msg_type, u8 mask) 400a68c439bSRobert Richter { 401a68c439bSRobert Richter unsigned long reg = APIC_EILVTn(offset); 402a68c439bSRobert Richter unsigned int new, old, reserved; 403a68c439bSRobert Richter 404a68c439bSRobert Richter new = (mask << 16) | (msg_type << 8) | vector; 405a68c439bSRobert Richter old = apic_read(reg); 406a68c439bSRobert Richter reserved = reserve_eilvt_offset(offset, new); 407a68c439bSRobert Richter 408a68c439bSRobert Richter if (reserved != new) { 409eb48c9cbSRobert Richter pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " 410eb48c9cbSRobert Richter "vector 0x%x, but the register is already in use for " 411eb48c9cbSRobert Richter "vector 0x%x on another cpu\n", 412eb48c9cbSRobert Richter smp_processor_id(), reg, offset, new, reserved); 413a68c439bSRobert Richter return -EINVAL; 414a68c439bSRobert Richter } 415a68c439bSRobert Richter 416a68c439bSRobert Richter if (!eilvt_entry_is_changeable(old, new)) { 417eb48c9cbSRobert Richter pr_err(FW_BUG "cpu %d, try to use APIC%lX (LVT offset %d) for " 418eb48c9cbSRobert Richter "vector 0x%x, but the register is already in use for " 419eb48c9cbSRobert Richter "vector 0x%x on this cpu\n", 420eb48c9cbSRobert Richter smp_processor_id(), reg, offset, new, old); 421a68c439bSRobert Richter return -EBUSY; 422a68c439bSRobert Richter } 423a68c439bSRobert Richter 424a68c439bSRobert Richter apic_write(reg, new); 425a68c439bSRobert Richter 426a68c439bSRobert Richter return 0; 427f62bae50SIngo Molnar } 42827afdf20SRobert Richter EXPORT_SYMBOL_GPL(setup_APIC_eilvt); 429f62bae50SIngo Molnar 430f62bae50SIngo Molnar /* 431f62bae50SIngo Molnar * Program the next event, relative to now 432f62bae50SIngo Molnar */ 433f62bae50SIngo Molnar static int lapic_next_event(unsigned long delta, 434f62bae50SIngo Molnar struct clock_event_device *evt) 435f62bae50SIngo Molnar { 436f62bae50SIngo Molnar apic_write(APIC_TMICT, delta); 437f62bae50SIngo Molnar return 0; 438f62bae50SIngo Molnar } 439f62bae50SIngo Molnar 440f62bae50SIngo Molnar /* 441f62bae50SIngo Molnar * Setup the lapic timer in periodic or oneshot mode 442f62bae50SIngo Molnar */ 443f62bae50SIngo Molnar static void lapic_timer_setup(enum clock_event_mode mode, 444f62bae50SIngo Molnar struct clock_event_device *evt) 445f62bae50SIngo Molnar { 446f62bae50SIngo Molnar unsigned long flags; 447f62bae50SIngo Molnar unsigned int v; 448f62bae50SIngo Molnar 449f62bae50SIngo Molnar /* Lapic used as dummy for broadcast ? */ 450f62bae50SIngo Molnar if (evt->features & CLOCK_EVT_FEAT_DUMMY) 451f62bae50SIngo Molnar return; 452f62bae50SIngo Molnar 453f62bae50SIngo Molnar local_irq_save(flags); 454f62bae50SIngo Molnar 455f62bae50SIngo Molnar switch (mode) { 456f62bae50SIngo Molnar case CLOCK_EVT_MODE_PERIODIC: 457f62bae50SIngo Molnar case CLOCK_EVT_MODE_ONESHOT: 4581ade93efSJacob Pan __setup_APIC_LVTT(lapic_timer_frequency, 459f62bae50SIngo Molnar mode != CLOCK_EVT_MODE_PERIODIC, 1); 460f62bae50SIngo Molnar break; 461f62bae50SIngo Molnar case CLOCK_EVT_MODE_UNUSED: 462f62bae50SIngo Molnar case CLOCK_EVT_MODE_SHUTDOWN: 463f62bae50SIngo Molnar v = apic_read(APIC_LVTT); 464f62bae50SIngo Molnar v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); 465f62bae50SIngo Molnar apic_write(APIC_LVTT, v); 4666f9b4100SAndreas Herrmann apic_write(APIC_TMICT, 0); 467f62bae50SIngo Molnar break; 468f62bae50SIngo Molnar case CLOCK_EVT_MODE_RESUME: 469f62bae50SIngo Molnar /* Nothing to do here */ 470f62bae50SIngo Molnar break; 471f62bae50SIngo Molnar } 472f62bae50SIngo Molnar 473f62bae50SIngo Molnar local_irq_restore(flags); 474f62bae50SIngo Molnar } 475f62bae50SIngo Molnar 476f62bae50SIngo Molnar /* 477f62bae50SIngo Molnar * Local APIC timer broadcast function 478f62bae50SIngo Molnar */ 479f62bae50SIngo Molnar static void lapic_timer_broadcast(const struct cpumask *mask) 480f62bae50SIngo Molnar { 481f62bae50SIngo Molnar #ifdef CONFIG_SMP 482f62bae50SIngo Molnar apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); 483f62bae50SIngo Molnar #endif 484f62bae50SIngo Molnar } 485f62bae50SIngo Molnar 48625874a29SHenrik Kretzschmar 48725874a29SHenrik Kretzschmar /* 48825874a29SHenrik Kretzschmar * The local apic timer can be used for any function which is CPU local. 48925874a29SHenrik Kretzschmar */ 49025874a29SHenrik Kretzschmar static struct clock_event_device lapic_clockevent = { 49125874a29SHenrik Kretzschmar .name = "lapic", 49225874a29SHenrik Kretzschmar .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT 49325874a29SHenrik Kretzschmar | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, 49425874a29SHenrik Kretzschmar .shift = 32, 49525874a29SHenrik Kretzschmar .set_mode = lapic_timer_setup, 49625874a29SHenrik Kretzschmar .set_next_event = lapic_next_event, 49725874a29SHenrik Kretzschmar .broadcast = lapic_timer_broadcast, 49825874a29SHenrik Kretzschmar .rating = 100, 49925874a29SHenrik Kretzschmar .irq = -1, 50025874a29SHenrik Kretzschmar }; 50125874a29SHenrik Kretzschmar static DEFINE_PER_CPU(struct clock_event_device, lapic_events); 50225874a29SHenrik Kretzschmar 503f62bae50SIngo Molnar /* 504421f91d2SUwe Kleine-König * Setup the local APIC timer for this CPU. Copy the initialized values 505f62bae50SIngo Molnar * of the boot CPU and register the clock event in the framework. 506f62bae50SIngo Molnar */ 507f62bae50SIngo Molnar static void __cpuinit setup_APIC_timer(void) 508f62bae50SIngo Molnar { 509f62bae50SIngo Molnar struct clock_event_device *levt = &__get_cpu_var(lapic_events); 510f62bae50SIngo Molnar 511349c004eSChristoph Lameter if (this_cpu_has(X86_FEATURE_ARAT)) { 512db954b58SVenkatesh Pallipadi lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; 513db954b58SVenkatesh Pallipadi /* Make LAPIC timer preferrable over percpu HPET */ 514db954b58SVenkatesh Pallipadi lapic_clockevent.rating = 150; 515db954b58SVenkatesh Pallipadi } 516db954b58SVenkatesh Pallipadi 517f62bae50SIngo Molnar memcpy(levt, &lapic_clockevent, sizeof(*levt)); 518f62bae50SIngo Molnar levt->cpumask = cpumask_of(smp_processor_id()); 519f62bae50SIngo Molnar 520f62bae50SIngo Molnar clockevents_register_device(levt); 521f62bae50SIngo Molnar } 522f62bae50SIngo Molnar 523f62bae50SIngo Molnar /* 524f62bae50SIngo Molnar * In this functions we calibrate APIC bus clocks to the external timer. 525f62bae50SIngo Molnar * 526f62bae50SIngo Molnar * We want to do the calibration only once since we want to have local timer 527f62bae50SIngo Molnar * irqs syncron. CPUs connected by the same APIC bus have the very same bus 528f62bae50SIngo Molnar * frequency. 529f62bae50SIngo Molnar * 530f62bae50SIngo Molnar * This was previously done by reading the PIT/HPET and waiting for a wrap 531f62bae50SIngo Molnar * around to find out, that a tick has elapsed. I have a box, where the PIT 532f62bae50SIngo Molnar * readout is broken, so it never gets out of the wait loop again. This was 533f62bae50SIngo Molnar * also reported by others. 534f62bae50SIngo Molnar * 535f62bae50SIngo Molnar * Monitoring the jiffies value is inaccurate and the clockevents 536f62bae50SIngo Molnar * infrastructure allows us to do a simple substitution of the interrupt 537f62bae50SIngo Molnar * handler. 538f62bae50SIngo Molnar * 539f62bae50SIngo Molnar * The calibration routine also uses the pm_timer when possible, as the PIT 540f62bae50SIngo Molnar * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes 541f62bae50SIngo Molnar * back to normal later in the boot process). 542f62bae50SIngo Molnar */ 543f62bae50SIngo Molnar 544f62bae50SIngo Molnar #define LAPIC_CAL_LOOPS (HZ/10) 545f62bae50SIngo Molnar 546f62bae50SIngo Molnar static __initdata int lapic_cal_loops = -1; 547f62bae50SIngo Molnar static __initdata long lapic_cal_t1, lapic_cal_t2; 548f62bae50SIngo Molnar static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; 549f62bae50SIngo Molnar static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; 550f62bae50SIngo Molnar static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; 551f62bae50SIngo Molnar 552f62bae50SIngo Molnar /* 553f62bae50SIngo Molnar * Temporary interrupt handler. 554f62bae50SIngo Molnar */ 555f62bae50SIngo Molnar static void __init lapic_cal_handler(struct clock_event_device *dev) 556f62bae50SIngo Molnar { 557f62bae50SIngo Molnar unsigned long long tsc = 0; 558f62bae50SIngo Molnar long tapic = apic_read(APIC_TMCCT); 559f62bae50SIngo Molnar unsigned long pm = acpi_pm_read_early(); 560f62bae50SIngo Molnar 561f62bae50SIngo Molnar if (cpu_has_tsc) 562f62bae50SIngo Molnar rdtscll(tsc); 563f62bae50SIngo Molnar 564f62bae50SIngo Molnar switch (lapic_cal_loops++) { 565f62bae50SIngo Molnar case 0: 566f62bae50SIngo Molnar lapic_cal_t1 = tapic; 567f62bae50SIngo Molnar lapic_cal_tsc1 = tsc; 568f62bae50SIngo Molnar lapic_cal_pm1 = pm; 569f62bae50SIngo Molnar lapic_cal_j1 = jiffies; 570f62bae50SIngo Molnar break; 571f62bae50SIngo Molnar 572f62bae50SIngo Molnar case LAPIC_CAL_LOOPS: 573f62bae50SIngo Molnar lapic_cal_t2 = tapic; 574f62bae50SIngo Molnar lapic_cal_tsc2 = tsc; 575f62bae50SIngo Molnar if (pm < lapic_cal_pm1) 576f62bae50SIngo Molnar pm += ACPI_PM_OVRRUN; 577f62bae50SIngo Molnar lapic_cal_pm2 = pm; 578f62bae50SIngo Molnar lapic_cal_j2 = jiffies; 579f62bae50SIngo Molnar break; 580f62bae50SIngo Molnar } 581f62bae50SIngo Molnar } 582f62bae50SIngo Molnar 583f62bae50SIngo Molnar static int __init 584f62bae50SIngo Molnar calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) 585f62bae50SIngo Molnar { 586f62bae50SIngo Molnar const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; 587f62bae50SIngo Molnar const long pm_thresh = pm_100ms / 100; 588f62bae50SIngo Molnar unsigned long mult; 589f62bae50SIngo Molnar u64 res; 590f62bae50SIngo Molnar 591f62bae50SIngo Molnar #ifndef CONFIG_X86_PM_TIMER 592f62bae50SIngo Molnar return -1; 593f62bae50SIngo Molnar #endif 594f62bae50SIngo Molnar 595f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); 596f62bae50SIngo Molnar 597f62bae50SIngo Molnar /* Check, if the PM timer is available */ 598f62bae50SIngo Molnar if (!deltapm) 599f62bae50SIngo Molnar return -1; 600f62bae50SIngo Molnar 601f62bae50SIngo Molnar mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); 602f62bae50SIngo Molnar 603f62bae50SIngo Molnar if (deltapm > (pm_100ms - pm_thresh) && 604f62bae50SIngo Molnar deltapm < (pm_100ms + pm_thresh)) { 605f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); 606f62bae50SIngo Molnar return 0; 607f62bae50SIngo Molnar } 608f62bae50SIngo Molnar 609f62bae50SIngo Molnar res = (((u64)deltapm) * mult) >> 22; 610f62bae50SIngo Molnar do_div(res, 1000000); 611f62bae50SIngo Molnar pr_warning("APIC calibration not consistent " 612f62bae50SIngo Molnar "with PM-Timer: %ldms instead of 100ms\n",(long)res); 613f62bae50SIngo Molnar 614f62bae50SIngo Molnar /* Correct the lapic counter value */ 615f62bae50SIngo Molnar res = (((u64)(*delta)) * pm_100ms); 616f62bae50SIngo Molnar do_div(res, deltapm); 617f62bae50SIngo Molnar pr_info("APIC delta adjusted to PM-Timer: " 618f62bae50SIngo Molnar "%lu (%ld)\n", (unsigned long)res, *delta); 619f62bae50SIngo Molnar *delta = (long)res; 620f62bae50SIngo Molnar 621f62bae50SIngo Molnar /* Correct the tsc counter value */ 622f62bae50SIngo Molnar if (cpu_has_tsc) { 623f62bae50SIngo Molnar res = (((u64)(*deltatsc)) * pm_100ms); 624f62bae50SIngo Molnar do_div(res, deltapm); 625f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "TSC delta adjusted to " 626f62bae50SIngo Molnar "PM-Timer: %lu (%ld)\n", 627f62bae50SIngo Molnar (unsigned long)res, *deltatsc); 628f62bae50SIngo Molnar *deltatsc = (long)res; 629f62bae50SIngo Molnar } 630f62bae50SIngo Molnar 631f62bae50SIngo Molnar return 0; 632f62bae50SIngo Molnar } 633f62bae50SIngo Molnar 634f62bae50SIngo Molnar static int __init calibrate_APIC_clock(void) 635f62bae50SIngo Molnar { 636f62bae50SIngo Molnar struct clock_event_device *levt = &__get_cpu_var(lapic_events); 637f62bae50SIngo Molnar void (*real_handler)(struct clock_event_device *dev); 638f62bae50SIngo Molnar unsigned long deltaj; 639f62bae50SIngo Molnar long delta, deltatsc; 640f62bae50SIngo Molnar int pm_referenced = 0; 641f62bae50SIngo Molnar 6421ade93efSJacob Pan /** 6431ade93efSJacob Pan * check if lapic timer has already been calibrated by platform 6441ade93efSJacob Pan * specific routine, such as tsc calibration code. if so, we just fill 6451ade93efSJacob Pan * in the clockevent structure and return. 6461ade93efSJacob Pan */ 6471ade93efSJacob Pan 6481ade93efSJacob Pan if (lapic_timer_frequency) { 6491ade93efSJacob Pan apic_printk(APIC_VERBOSE, "lapic timer already calibrated %d\n", 6501ade93efSJacob Pan lapic_timer_frequency); 6511ade93efSJacob Pan lapic_clockevent.mult = div_sc(lapic_timer_frequency/APIC_DIVISOR, 6521ade93efSJacob Pan TICK_NSEC, lapic_clockevent.shift); 6531ade93efSJacob Pan lapic_clockevent.max_delta_ns = 6541ade93efSJacob Pan clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); 6551ade93efSJacob Pan lapic_clockevent.min_delta_ns = 6561ade93efSJacob Pan clockevent_delta2ns(0xF, &lapic_clockevent); 6571ade93efSJacob Pan lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; 6581ade93efSJacob Pan return 0; 6591ade93efSJacob Pan } 6601ade93efSJacob Pan 661f62bae50SIngo Molnar local_irq_disable(); 662f62bae50SIngo Molnar 663f62bae50SIngo Molnar /* Replace the global interrupt handler */ 664f62bae50SIngo Molnar real_handler = global_clock_event->event_handler; 665f62bae50SIngo Molnar global_clock_event->event_handler = lapic_cal_handler; 666f62bae50SIngo Molnar 667f62bae50SIngo Molnar /* 668f62bae50SIngo Molnar * Setup the APIC counter to maximum. There is no way the lapic 669f62bae50SIngo Molnar * can underflow in the 100ms detection time frame 670f62bae50SIngo Molnar */ 671f62bae50SIngo Molnar __setup_APIC_LVTT(0xffffffff, 0, 0); 672f62bae50SIngo Molnar 673f62bae50SIngo Molnar /* Let the interrupts run */ 674f62bae50SIngo Molnar local_irq_enable(); 675f62bae50SIngo Molnar 676f62bae50SIngo Molnar while (lapic_cal_loops <= LAPIC_CAL_LOOPS) 677f62bae50SIngo Molnar cpu_relax(); 678f62bae50SIngo Molnar 679f62bae50SIngo Molnar local_irq_disable(); 680f62bae50SIngo Molnar 681f62bae50SIngo Molnar /* Restore the real event handler */ 682f62bae50SIngo Molnar global_clock_event->event_handler = real_handler; 683f62bae50SIngo Molnar 684f62bae50SIngo Molnar /* Build delta t1-t2 as apic timer counts down */ 685f62bae50SIngo Molnar delta = lapic_cal_t1 - lapic_cal_t2; 686f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); 687f62bae50SIngo Molnar 688f62bae50SIngo Molnar deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); 689f62bae50SIngo Molnar 690f62bae50SIngo Molnar /* we trust the PM based calibration if possible */ 691f62bae50SIngo Molnar pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, 692f62bae50SIngo Molnar &delta, &deltatsc); 693f62bae50SIngo Molnar 694f62bae50SIngo Molnar /* Calculate the scaled math multiplication factor */ 695f62bae50SIngo Molnar lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, 696f62bae50SIngo Molnar lapic_clockevent.shift); 697f62bae50SIngo Molnar lapic_clockevent.max_delta_ns = 6984aed89d6SPierre Tardy clockevent_delta2ns(0x7FFFFFFF, &lapic_clockevent); 699f62bae50SIngo Molnar lapic_clockevent.min_delta_ns = 700f62bae50SIngo Molnar clockevent_delta2ns(0xF, &lapic_clockevent); 701f62bae50SIngo Molnar 7021ade93efSJacob Pan lapic_timer_frequency = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; 703f62bae50SIngo Molnar 704f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); 705411462f6SThomas Gleixner apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult); 706f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", 7071ade93efSJacob Pan lapic_timer_frequency); 708f62bae50SIngo Molnar 709f62bae50SIngo Molnar if (cpu_has_tsc) { 710f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... CPU clock speed is " 711f62bae50SIngo Molnar "%ld.%04ld MHz.\n", 712f62bae50SIngo Molnar (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), 713f62bae50SIngo Molnar (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); 714f62bae50SIngo Molnar } 715f62bae50SIngo Molnar 716f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "..... host bus clock speed is " 717f62bae50SIngo Molnar "%u.%04u MHz.\n", 7181ade93efSJacob Pan lapic_timer_frequency / (1000000 / HZ), 7191ade93efSJacob Pan lapic_timer_frequency % (1000000 / HZ)); 720f62bae50SIngo Molnar 721f62bae50SIngo Molnar /* 722f62bae50SIngo Molnar * Do a sanity check on the APIC calibration result 723f62bae50SIngo Molnar */ 7241ade93efSJacob Pan if (lapic_timer_frequency < (1000000 / HZ)) { 725f62bae50SIngo Molnar local_irq_enable(); 726f62bae50SIngo Molnar pr_warning("APIC frequency too slow, disabling apic timer\n"); 727f62bae50SIngo Molnar return -1; 728f62bae50SIngo Molnar } 729f62bae50SIngo Molnar 730f62bae50SIngo Molnar levt->features &= ~CLOCK_EVT_FEAT_DUMMY; 731f62bae50SIngo Molnar 732f62bae50SIngo Molnar /* 733f62bae50SIngo Molnar * PM timer calibration failed or not turned on 734f62bae50SIngo Molnar * so lets try APIC timer based calibration 735f62bae50SIngo Molnar */ 736f62bae50SIngo Molnar if (!pm_referenced) { 737f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); 738f62bae50SIngo Molnar 739f62bae50SIngo Molnar /* 740f62bae50SIngo Molnar * Setup the apic timer manually 741f62bae50SIngo Molnar */ 742f62bae50SIngo Molnar levt->event_handler = lapic_cal_handler; 743f62bae50SIngo Molnar lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); 744f62bae50SIngo Molnar lapic_cal_loops = -1; 745f62bae50SIngo Molnar 746f62bae50SIngo Molnar /* Let the interrupts run */ 747f62bae50SIngo Molnar local_irq_enable(); 748f62bae50SIngo Molnar 749f62bae50SIngo Molnar while (lapic_cal_loops <= LAPIC_CAL_LOOPS) 750f62bae50SIngo Molnar cpu_relax(); 751f62bae50SIngo Molnar 752f62bae50SIngo Molnar /* Stop the lapic timer */ 753f62bae50SIngo Molnar lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); 754f62bae50SIngo Molnar 755f62bae50SIngo Molnar /* Jiffies delta */ 756f62bae50SIngo Molnar deltaj = lapic_cal_j2 - lapic_cal_j1; 757f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); 758f62bae50SIngo Molnar 759f62bae50SIngo Molnar /* Check, if the jiffies result is consistent */ 760f62bae50SIngo Molnar if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) 761f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); 762f62bae50SIngo Molnar else 763f62bae50SIngo Molnar levt->features |= CLOCK_EVT_FEAT_DUMMY; 764f62bae50SIngo Molnar } else 765f62bae50SIngo Molnar local_irq_enable(); 766f62bae50SIngo Molnar 767f62bae50SIngo Molnar if (levt->features & CLOCK_EVT_FEAT_DUMMY) { 768f62bae50SIngo Molnar pr_warning("APIC timer disabled due to verification failure\n"); 769f62bae50SIngo Molnar return -1; 770f62bae50SIngo Molnar } 771f62bae50SIngo Molnar 772f62bae50SIngo Molnar return 0; 773f62bae50SIngo Molnar } 774f62bae50SIngo Molnar 775f62bae50SIngo Molnar /* 776f62bae50SIngo Molnar * Setup the boot APIC 777f62bae50SIngo Molnar * 778f62bae50SIngo Molnar * Calibrate and verify the result. 779f62bae50SIngo Molnar */ 780f62bae50SIngo Molnar void __init setup_boot_APIC_clock(void) 781f62bae50SIngo Molnar { 782f62bae50SIngo Molnar /* 783f62bae50SIngo Molnar * The local apic timer can be disabled via the kernel 784f62bae50SIngo Molnar * commandline or from the CPU detection code. Register the lapic 785f62bae50SIngo Molnar * timer as a dummy clock event source on SMP systems, so the 786f62bae50SIngo Molnar * broadcast mechanism is used. On UP systems simply ignore it. 787f62bae50SIngo Molnar */ 788f62bae50SIngo Molnar if (disable_apic_timer) { 789f62bae50SIngo Molnar pr_info("Disabling APIC timer\n"); 790f62bae50SIngo Molnar /* No broadcast on UP ! */ 791f62bae50SIngo Molnar if (num_possible_cpus() > 1) { 792f62bae50SIngo Molnar lapic_clockevent.mult = 1; 793f62bae50SIngo Molnar setup_APIC_timer(); 794f62bae50SIngo Molnar } 795f62bae50SIngo Molnar return; 796f62bae50SIngo Molnar } 797f62bae50SIngo Molnar 798f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" 799f62bae50SIngo Molnar "calibrating APIC timer ...\n"); 800f62bae50SIngo Molnar 801f62bae50SIngo Molnar if (calibrate_APIC_clock()) { 802f62bae50SIngo Molnar /* No broadcast on UP ! */ 803f62bae50SIngo Molnar if (num_possible_cpus() > 1) 804f62bae50SIngo Molnar setup_APIC_timer(); 805f62bae50SIngo Molnar return; 806f62bae50SIngo Molnar } 807f62bae50SIngo Molnar 808f62bae50SIngo Molnar /* 809f62bae50SIngo Molnar * If nmi_watchdog is set to IO_APIC, we need the 810f62bae50SIngo Molnar * PIT/HPET going. Otherwise register lapic as a dummy 811f62bae50SIngo Molnar * device. 812f62bae50SIngo Molnar */ 813f62bae50SIngo Molnar lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; 814f62bae50SIngo Molnar 815f62bae50SIngo Molnar /* Setup the lapic or request the broadcast */ 816f62bae50SIngo Molnar setup_APIC_timer(); 817f62bae50SIngo Molnar } 818f62bae50SIngo Molnar 819f62bae50SIngo Molnar void __cpuinit setup_secondary_APIC_clock(void) 820f62bae50SIngo Molnar { 821f62bae50SIngo Molnar setup_APIC_timer(); 822f62bae50SIngo Molnar } 823f62bae50SIngo Molnar 824f62bae50SIngo Molnar /* 825f62bae50SIngo Molnar * The guts of the apic timer interrupt 826f62bae50SIngo Molnar */ 827f62bae50SIngo Molnar static void local_apic_timer_interrupt(void) 828f62bae50SIngo Molnar { 829f62bae50SIngo Molnar int cpu = smp_processor_id(); 830f62bae50SIngo Molnar struct clock_event_device *evt = &per_cpu(lapic_events, cpu); 831f62bae50SIngo Molnar 832f62bae50SIngo Molnar /* 833f62bae50SIngo Molnar * Normally we should not be here till LAPIC has been initialized but 834f62bae50SIngo Molnar * in some cases like kdump, its possible that there is a pending LAPIC 835f62bae50SIngo Molnar * timer interrupt from previous kernel's context and is delivered in 836f62bae50SIngo Molnar * new kernel the moment interrupts are enabled. 837f62bae50SIngo Molnar * 838f62bae50SIngo Molnar * Interrupts are enabled early and LAPIC is setup much later, hence 839f62bae50SIngo Molnar * its possible that when we get here evt->event_handler is NULL. 840f62bae50SIngo Molnar * Check for event_handler being NULL and discard the interrupt as 841f62bae50SIngo Molnar * spurious. 842f62bae50SIngo Molnar */ 843f62bae50SIngo Molnar if (!evt->event_handler) { 844f62bae50SIngo Molnar pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); 845f62bae50SIngo Molnar /* Switch it off */ 846f62bae50SIngo Molnar lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); 847f62bae50SIngo Molnar return; 848f62bae50SIngo Molnar } 849f62bae50SIngo Molnar 850f62bae50SIngo Molnar /* 851f62bae50SIngo Molnar * the NMI deadlock-detector uses this. 852f62bae50SIngo Molnar */ 853f62bae50SIngo Molnar inc_irq_stat(apic_timer_irqs); 854f62bae50SIngo Molnar 855f62bae50SIngo Molnar evt->event_handler(evt); 856f62bae50SIngo Molnar } 857f62bae50SIngo Molnar 858f62bae50SIngo Molnar /* 859f62bae50SIngo Molnar * Local APIC timer interrupt. This is the most natural way for doing 860f62bae50SIngo Molnar * local interrupts, but local timer interrupts can be emulated by 861f62bae50SIngo Molnar * broadcast interrupts too. [in case the hw doesn't support APIC timers] 862f62bae50SIngo Molnar * 863f62bae50SIngo Molnar * [ if a single-CPU system runs an SMP kernel then we call the local 864f62bae50SIngo Molnar * interrupt as well. Thus we cannot inline the local irq ... ] 865f62bae50SIngo Molnar */ 866f62bae50SIngo Molnar void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) 867f62bae50SIngo Molnar { 868f62bae50SIngo Molnar struct pt_regs *old_regs = set_irq_regs(regs); 869f62bae50SIngo Molnar 870f62bae50SIngo Molnar /* 871f62bae50SIngo Molnar * NOTE! We'd better ACK the irq immediately, 872f62bae50SIngo Molnar * because timer handling can be slow. 873f62bae50SIngo Molnar */ 874f62bae50SIngo Molnar ack_APIC_irq(); 875f62bae50SIngo Molnar /* 876f62bae50SIngo Molnar * update_process_times() expects us to have done irq_enter(). 877f62bae50SIngo Molnar * Besides, if we don't timer interrupts ignore the global 878f62bae50SIngo Molnar * interrupt lock, which is the WrongThing (tm) to do. 879f62bae50SIngo Molnar */ 880f62bae50SIngo Molnar exit_idle(); 881f62bae50SIngo Molnar irq_enter(); 882f62bae50SIngo Molnar local_apic_timer_interrupt(); 883f62bae50SIngo Molnar irq_exit(); 884f62bae50SIngo Molnar 885f62bae50SIngo Molnar set_irq_regs(old_regs); 886f62bae50SIngo Molnar } 887f62bae50SIngo Molnar 888f62bae50SIngo Molnar int setup_profiling_timer(unsigned int multiplier) 889f62bae50SIngo Molnar { 890f62bae50SIngo Molnar return -EINVAL; 891f62bae50SIngo Molnar } 892f62bae50SIngo Molnar 893f62bae50SIngo Molnar /* 894f62bae50SIngo Molnar * Local APIC start and shutdown 895f62bae50SIngo Molnar */ 896f62bae50SIngo Molnar 897f62bae50SIngo Molnar /** 898f62bae50SIngo Molnar * clear_local_APIC - shutdown the local APIC 899f62bae50SIngo Molnar * 900f62bae50SIngo Molnar * This is called, when a CPU is disabled and before rebooting, so the state of 901f62bae50SIngo Molnar * the local APIC has no dangling leftovers. Also used to cleanout any BIOS 902f62bae50SIngo Molnar * leftovers during boot. 903f62bae50SIngo Molnar */ 904f62bae50SIngo Molnar void clear_local_APIC(void) 905f62bae50SIngo Molnar { 906f62bae50SIngo Molnar int maxlvt; 907f62bae50SIngo Molnar u32 v; 908f62bae50SIngo Molnar 909f62bae50SIngo Molnar /* APIC hasn't been mapped yet */ 910fc1edaf9SSuresh Siddha if (!x2apic_mode && !apic_phys) 911f62bae50SIngo Molnar return; 912f62bae50SIngo Molnar 913f62bae50SIngo Molnar maxlvt = lapic_get_maxlvt(); 914f62bae50SIngo Molnar /* 915f62bae50SIngo Molnar * Masking an LVT entry can trigger a local APIC error 916f62bae50SIngo Molnar * if the vector is zero. Mask LVTERR first to prevent this. 917f62bae50SIngo Molnar */ 918f62bae50SIngo Molnar if (maxlvt >= 3) { 919f62bae50SIngo Molnar v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ 920f62bae50SIngo Molnar apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); 921f62bae50SIngo Molnar } 922f62bae50SIngo Molnar /* 923f62bae50SIngo Molnar * Careful: we have to set masks only first to deassert 924f62bae50SIngo Molnar * any level-triggered sources. 925f62bae50SIngo Molnar */ 926f62bae50SIngo Molnar v = apic_read(APIC_LVTT); 927f62bae50SIngo Molnar apic_write(APIC_LVTT, v | APIC_LVT_MASKED); 928f62bae50SIngo Molnar v = apic_read(APIC_LVT0); 929f62bae50SIngo Molnar apic_write(APIC_LVT0, v | APIC_LVT_MASKED); 930f62bae50SIngo Molnar v = apic_read(APIC_LVT1); 931f62bae50SIngo Molnar apic_write(APIC_LVT1, v | APIC_LVT_MASKED); 932f62bae50SIngo Molnar if (maxlvt >= 4) { 933f62bae50SIngo Molnar v = apic_read(APIC_LVTPC); 934f62bae50SIngo Molnar apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); 935f62bae50SIngo Molnar } 936f62bae50SIngo Molnar 937f62bae50SIngo Molnar /* lets not touch this if we didn't frob it */ 9384efc0670SAndi Kleen #ifdef CONFIG_X86_THERMAL_VECTOR 939f62bae50SIngo Molnar if (maxlvt >= 5) { 940f62bae50SIngo Molnar v = apic_read(APIC_LVTTHMR); 941f62bae50SIngo Molnar apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); 942f62bae50SIngo Molnar } 943f62bae50SIngo Molnar #endif 944638bee71SH. Peter Anvin #ifdef CONFIG_X86_MCE_INTEL 945638bee71SH. Peter Anvin if (maxlvt >= 6) { 946638bee71SH. Peter Anvin v = apic_read(APIC_LVTCMCI); 947638bee71SH. Peter Anvin if (!(v & APIC_LVT_MASKED)) 948638bee71SH. Peter Anvin apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); 949638bee71SH. Peter Anvin } 950638bee71SH. Peter Anvin #endif 951638bee71SH. Peter Anvin 952f62bae50SIngo Molnar /* 953f62bae50SIngo Molnar * Clean APIC state for other OSs: 954f62bae50SIngo Molnar */ 955f62bae50SIngo Molnar apic_write(APIC_LVTT, APIC_LVT_MASKED); 956f62bae50SIngo Molnar apic_write(APIC_LVT0, APIC_LVT_MASKED); 957f62bae50SIngo Molnar apic_write(APIC_LVT1, APIC_LVT_MASKED); 958f62bae50SIngo Molnar if (maxlvt >= 3) 959f62bae50SIngo Molnar apic_write(APIC_LVTERR, APIC_LVT_MASKED); 960f62bae50SIngo Molnar if (maxlvt >= 4) 961f62bae50SIngo Molnar apic_write(APIC_LVTPC, APIC_LVT_MASKED); 962f62bae50SIngo Molnar 963f62bae50SIngo Molnar /* Integrated APIC (!82489DX) ? */ 964f62bae50SIngo Molnar if (lapic_is_integrated()) { 965f62bae50SIngo Molnar if (maxlvt > 3) 966f62bae50SIngo Molnar /* Clear ESR due to Pentium errata 3AP and 11AP */ 967f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 968f62bae50SIngo Molnar apic_read(APIC_ESR); 969f62bae50SIngo Molnar } 970f62bae50SIngo Molnar } 971f62bae50SIngo Molnar 972f62bae50SIngo Molnar /** 973f62bae50SIngo Molnar * disable_local_APIC - clear and disable the local APIC 974f62bae50SIngo Molnar */ 975f62bae50SIngo Molnar void disable_local_APIC(void) 976f62bae50SIngo Molnar { 977f62bae50SIngo Molnar unsigned int value; 978f62bae50SIngo Molnar 979f62bae50SIngo Molnar /* APIC hasn't been mapped yet */ 980fd19dce7SYinghai Lu if (!x2apic_mode && !apic_phys) 981f62bae50SIngo Molnar return; 982f62bae50SIngo Molnar 983f62bae50SIngo Molnar clear_local_APIC(); 984f62bae50SIngo Molnar 985f62bae50SIngo Molnar /* 986f62bae50SIngo Molnar * Disable APIC (implies clearing of registers 987f62bae50SIngo Molnar * for 82489DX!). 988f62bae50SIngo Molnar */ 989f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 990f62bae50SIngo Molnar value &= ~APIC_SPIV_APIC_ENABLED; 991f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 992f62bae50SIngo Molnar 993f62bae50SIngo Molnar #ifdef CONFIG_X86_32 994f62bae50SIngo Molnar /* 995f62bae50SIngo Molnar * When LAPIC was disabled by the BIOS and enabled by the kernel, 996f62bae50SIngo Molnar * restore the disabled state. 997f62bae50SIngo Molnar */ 998f62bae50SIngo Molnar if (enabled_via_apicbase) { 999f62bae50SIngo Molnar unsigned int l, h; 1000f62bae50SIngo Molnar 1001f62bae50SIngo Molnar rdmsr(MSR_IA32_APICBASE, l, h); 1002f62bae50SIngo Molnar l &= ~MSR_IA32_APICBASE_ENABLE; 1003f62bae50SIngo Molnar wrmsr(MSR_IA32_APICBASE, l, h); 1004f62bae50SIngo Molnar } 1005f62bae50SIngo Molnar #endif 1006f62bae50SIngo Molnar } 1007f62bae50SIngo Molnar 1008f62bae50SIngo Molnar /* 1009f62bae50SIngo Molnar * If Linux enabled the LAPIC against the BIOS default disable it down before 1010f62bae50SIngo Molnar * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and 1011f62bae50SIngo Molnar * not power-off. Additionally clear all LVT entries before disable_local_APIC 1012f62bae50SIngo Molnar * for the case where Linux didn't enable the LAPIC. 1013f62bae50SIngo Molnar */ 1014f62bae50SIngo Molnar void lapic_shutdown(void) 1015f62bae50SIngo Molnar { 1016f62bae50SIngo Molnar unsigned long flags; 1017f62bae50SIngo Molnar 10188312136fSCyrill Gorcunov if (!cpu_has_apic && !apic_from_smp_config()) 1019f62bae50SIngo Molnar return; 1020f62bae50SIngo Molnar 1021f62bae50SIngo Molnar local_irq_save(flags); 1022f62bae50SIngo Molnar 1023f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1024f62bae50SIngo Molnar if (!enabled_via_apicbase) 1025f62bae50SIngo Molnar clear_local_APIC(); 1026f62bae50SIngo Molnar else 1027f62bae50SIngo Molnar #endif 1028f62bae50SIngo Molnar disable_local_APIC(); 1029f62bae50SIngo Molnar 1030f62bae50SIngo Molnar 1031f62bae50SIngo Molnar local_irq_restore(flags); 1032f62bae50SIngo Molnar } 1033f62bae50SIngo Molnar 1034f62bae50SIngo Molnar /* 1035f62bae50SIngo Molnar * This is to verify that we're looking at a real local APIC. 1036f62bae50SIngo Molnar * Check these against your board if the CPUs aren't getting 1037f62bae50SIngo Molnar * started for no apparent reason. 1038f62bae50SIngo Molnar */ 1039f62bae50SIngo Molnar int __init verify_local_APIC(void) 1040f62bae50SIngo Molnar { 1041f62bae50SIngo Molnar unsigned int reg0, reg1; 1042f62bae50SIngo Molnar 1043f62bae50SIngo Molnar /* 1044f62bae50SIngo Molnar * The version register is read-only in a real APIC. 1045f62bae50SIngo Molnar */ 1046f62bae50SIngo Molnar reg0 = apic_read(APIC_LVR); 1047f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); 1048f62bae50SIngo Molnar apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); 1049f62bae50SIngo Molnar reg1 = apic_read(APIC_LVR); 1050f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); 1051f62bae50SIngo Molnar 1052f62bae50SIngo Molnar /* 1053f62bae50SIngo Molnar * The two version reads above should print the same 1054f62bae50SIngo Molnar * numbers. If the second one is different, then we 1055f62bae50SIngo Molnar * poke at a non-APIC. 1056f62bae50SIngo Molnar */ 1057f62bae50SIngo Molnar if (reg1 != reg0) 1058f62bae50SIngo Molnar return 0; 1059f62bae50SIngo Molnar 1060f62bae50SIngo Molnar /* 1061f62bae50SIngo Molnar * Check if the version looks reasonably. 1062f62bae50SIngo Molnar */ 1063f62bae50SIngo Molnar reg1 = GET_APIC_VERSION(reg0); 1064f62bae50SIngo Molnar if (reg1 == 0x00 || reg1 == 0xff) 1065f62bae50SIngo Molnar return 0; 1066f62bae50SIngo Molnar reg1 = lapic_get_maxlvt(); 1067f62bae50SIngo Molnar if (reg1 < 0x02 || reg1 == 0xff) 1068f62bae50SIngo Molnar return 0; 1069f62bae50SIngo Molnar 1070f62bae50SIngo Molnar /* 1071f62bae50SIngo Molnar * The ID register is read/write in a real APIC. 1072f62bae50SIngo Molnar */ 1073f62bae50SIngo Molnar reg0 = apic_read(APIC_ID); 1074f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); 1075f62bae50SIngo Molnar apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); 1076f62bae50SIngo Molnar reg1 = apic_read(APIC_ID); 1077f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); 1078f62bae50SIngo Molnar apic_write(APIC_ID, reg0); 1079f62bae50SIngo Molnar if (reg1 != (reg0 ^ apic->apic_id_mask)) 1080f62bae50SIngo Molnar return 0; 1081f62bae50SIngo Molnar 1082f62bae50SIngo Molnar /* 1083f62bae50SIngo Molnar * The next two are just to see if we have sane values. 1084f62bae50SIngo Molnar * They're only really relevant if we're in Virtual Wire 1085f62bae50SIngo Molnar * compatibility mode, but most boxes are anymore. 1086f62bae50SIngo Molnar */ 1087f62bae50SIngo Molnar reg0 = apic_read(APIC_LVT0); 1088f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); 1089f62bae50SIngo Molnar reg1 = apic_read(APIC_LVT1); 1090f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); 1091f62bae50SIngo Molnar 1092f62bae50SIngo Molnar return 1; 1093f62bae50SIngo Molnar } 1094f62bae50SIngo Molnar 1095f62bae50SIngo Molnar /** 1096f62bae50SIngo Molnar * sync_Arb_IDs - synchronize APIC bus arbitration IDs 1097f62bae50SIngo Molnar */ 1098f62bae50SIngo Molnar void __init sync_Arb_IDs(void) 1099f62bae50SIngo Molnar { 1100f62bae50SIngo Molnar /* 1101f62bae50SIngo Molnar * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not 1102f62bae50SIngo Molnar * needed on AMD. 1103f62bae50SIngo Molnar */ 1104f62bae50SIngo Molnar if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 1105f62bae50SIngo Molnar return; 1106f62bae50SIngo Molnar 1107f62bae50SIngo Molnar /* 1108f62bae50SIngo Molnar * Wait for idle. 1109f62bae50SIngo Molnar */ 1110f62bae50SIngo Molnar apic_wait_icr_idle(); 1111f62bae50SIngo Molnar 1112f62bae50SIngo Molnar apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); 1113f62bae50SIngo Molnar apic_write(APIC_ICR, APIC_DEST_ALLINC | 1114f62bae50SIngo Molnar APIC_INT_LEVELTRIG | APIC_DM_INIT); 1115f62bae50SIngo Molnar } 1116f62bae50SIngo Molnar 1117f62bae50SIngo Molnar /* 1118f62bae50SIngo Molnar * An initial setup of the virtual wire mode. 1119f62bae50SIngo Molnar */ 1120f62bae50SIngo Molnar void __init init_bsp_APIC(void) 1121f62bae50SIngo Molnar { 1122f62bae50SIngo Molnar unsigned int value; 1123f62bae50SIngo Molnar 1124f62bae50SIngo Molnar /* 1125f62bae50SIngo Molnar * Don't do the setup now if we have a SMP BIOS as the 1126f62bae50SIngo Molnar * through-I/O-APIC virtual wire mode might be active. 1127f62bae50SIngo Molnar */ 1128f62bae50SIngo Molnar if (smp_found_config || !cpu_has_apic) 1129f62bae50SIngo Molnar return; 1130f62bae50SIngo Molnar 1131f62bae50SIngo Molnar /* 1132f62bae50SIngo Molnar * Do not trust the local APIC being empty at bootup. 1133f62bae50SIngo Molnar */ 1134f62bae50SIngo Molnar clear_local_APIC(); 1135f62bae50SIngo Molnar 1136f62bae50SIngo Molnar /* 1137f62bae50SIngo Molnar * Enable APIC. 1138f62bae50SIngo Molnar */ 1139f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 1140f62bae50SIngo Molnar value &= ~APIC_VECTOR_MASK; 1141f62bae50SIngo Molnar value |= APIC_SPIV_APIC_ENABLED; 1142f62bae50SIngo Molnar 1143f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1144f62bae50SIngo Molnar /* This bit is reserved on P4/Xeon and should be cleared */ 1145f62bae50SIngo Molnar if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && 1146f62bae50SIngo Molnar (boot_cpu_data.x86 == 15)) 1147f62bae50SIngo Molnar value &= ~APIC_SPIV_FOCUS_DISABLED; 1148f62bae50SIngo Molnar else 1149f62bae50SIngo Molnar #endif 1150f62bae50SIngo Molnar value |= APIC_SPIV_FOCUS_DISABLED; 1151f62bae50SIngo Molnar value |= SPURIOUS_APIC_VECTOR; 1152f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 1153f62bae50SIngo Molnar 1154f62bae50SIngo Molnar /* 1155f62bae50SIngo Molnar * Set up the virtual wire mode. 1156f62bae50SIngo Molnar */ 1157f62bae50SIngo Molnar apic_write(APIC_LVT0, APIC_DM_EXTINT); 1158f62bae50SIngo Molnar value = APIC_DM_NMI; 1159f62bae50SIngo Molnar if (!lapic_is_integrated()) /* 82489DX */ 1160f62bae50SIngo Molnar value |= APIC_LVT_LEVEL_TRIGGER; 1161f62bae50SIngo Molnar apic_write(APIC_LVT1, value); 1162f62bae50SIngo Molnar } 1163f62bae50SIngo Molnar 1164f62bae50SIngo Molnar static void __cpuinit lapic_setup_esr(void) 1165f62bae50SIngo Molnar { 1166f62bae50SIngo Molnar unsigned int oldvalue, value, maxlvt; 1167f62bae50SIngo Molnar 1168f62bae50SIngo Molnar if (!lapic_is_integrated()) { 1169f62bae50SIngo Molnar pr_info("No ESR for 82489DX.\n"); 1170f62bae50SIngo Molnar return; 1171f62bae50SIngo Molnar } 1172f62bae50SIngo Molnar 1173f62bae50SIngo Molnar if (apic->disable_esr) { 1174f62bae50SIngo Molnar /* 1175f62bae50SIngo Molnar * Something untraceable is creating bad interrupts on 1176f62bae50SIngo Molnar * secondary quads ... for the moment, just leave the 1177f62bae50SIngo Molnar * ESR disabled - we can't do anything useful with the 1178f62bae50SIngo Molnar * errors anyway - mbligh 1179f62bae50SIngo Molnar */ 1180f62bae50SIngo Molnar pr_info("Leaving ESR disabled.\n"); 1181f62bae50SIngo Molnar return; 1182f62bae50SIngo Molnar } 1183f62bae50SIngo Molnar 1184f62bae50SIngo Molnar maxlvt = lapic_get_maxlvt(); 1185f62bae50SIngo Molnar if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ 1186f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1187f62bae50SIngo Molnar oldvalue = apic_read(APIC_ESR); 1188f62bae50SIngo Molnar 1189f62bae50SIngo Molnar /* enables sending errors */ 1190f62bae50SIngo Molnar value = ERROR_APIC_VECTOR; 1191f62bae50SIngo Molnar apic_write(APIC_LVTERR, value); 1192f62bae50SIngo Molnar 1193f62bae50SIngo Molnar /* 1194f62bae50SIngo Molnar * spec says clear errors after enabling vector. 1195f62bae50SIngo Molnar */ 1196f62bae50SIngo Molnar if (maxlvt > 3) 1197f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1198f62bae50SIngo Molnar value = apic_read(APIC_ESR); 1199f62bae50SIngo Molnar if (value != oldvalue) 1200f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "ESR value before enabling " 1201f62bae50SIngo Molnar "vector: 0x%08x after: 0x%08x\n", 1202f62bae50SIngo Molnar oldvalue, value); 1203f62bae50SIngo Molnar } 1204f62bae50SIngo Molnar 1205f62bae50SIngo Molnar /** 1206f62bae50SIngo Molnar * setup_local_APIC - setup the local APIC 12070aa002feSTejun Heo * 12080aa002feSTejun Heo * Used to setup local APIC while initializing BSP or bringin up APs. 12090aa002feSTejun Heo * Always called with preemption disabled. 1210f62bae50SIngo Molnar */ 1211f62bae50SIngo Molnar void __cpuinit setup_local_APIC(void) 1212f62bae50SIngo Molnar { 12130aa002feSTejun Heo int cpu = smp_processor_id(); 12148c3ba8d0SKerstin Jonsson unsigned int value, queued; 12158c3ba8d0SKerstin Jonsson int i, j, acked = 0; 12168c3ba8d0SKerstin Jonsson unsigned long long tsc = 0, ntsc; 12178c3ba8d0SKerstin Jonsson long long max_loops = cpu_khz; 12188c3ba8d0SKerstin Jonsson 12198c3ba8d0SKerstin Jonsson if (cpu_has_tsc) 12208c3ba8d0SKerstin Jonsson rdtscll(tsc); 1221f62bae50SIngo Molnar 1222f62bae50SIngo Molnar if (disable_apic) { 12237167d08eSHenrik Kretzschmar disable_ioapic_support(); 1224f62bae50SIngo Molnar return; 1225f62bae50SIngo Molnar } 1226f62bae50SIngo Molnar 1227f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1228f62bae50SIngo Molnar /* Pound the ESR really hard over the head with a big hammer - mbligh */ 1229f62bae50SIngo Molnar if (lapic_is_integrated() && apic->disable_esr) { 1230f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1231f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1232f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1233f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1234f62bae50SIngo Molnar } 1235f62bae50SIngo Molnar #endif 1236cdd6c482SIngo Molnar perf_events_lapic_init(); 1237f62bae50SIngo Molnar 1238f62bae50SIngo Molnar /* 1239f62bae50SIngo Molnar * Double-check whether this APIC is really registered. 1240f62bae50SIngo Molnar * This is meaningless in clustered apic mode, so we skip it. 1241f62bae50SIngo Molnar */ 1242c2777f98SDaniel Walker BUG_ON(!apic->apic_id_registered()); 1243f62bae50SIngo Molnar 1244f62bae50SIngo Molnar /* 1245f62bae50SIngo Molnar * Intel recommends to set DFR, LDR and TPR before enabling 1246f62bae50SIngo Molnar * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 1247f62bae50SIngo Molnar * document number 292116). So here it goes... 1248f62bae50SIngo Molnar */ 1249f62bae50SIngo Molnar apic->init_apic_ldr(); 1250f62bae50SIngo Molnar 12516f802c4bSTejun Heo #ifdef CONFIG_X86_32 12526f802c4bSTejun Heo /* 1253acb8bc09STejun Heo * APIC LDR is initialized. If logical_apicid mapping was 1254acb8bc09STejun Heo * initialized during get_smp_config(), make sure it matches the 1255acb8bc09STejun Heo * actual value. 12566f802c4bSTejun Heo */ 1257acb8bc09STejun Heo i = early_per_cpu(x86_cpu_to_logical_apicid, cpu); 1258acb8bc09STejun Heo WARN_ON(i != BAD_APICID && i != logical_smp_processor_id()); 1259acb8bc09STejun Heo /* always use the value from LDR */ 12606f802c4bSTejun Heo early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 12616f802c4bSTejun Heo logical_smp_processor_id(); 1262c4b90c11STejun Heo 1263c4b90c11STejun Heo /* 1264c4b90c11STejun Heo * Some NUMA implementations (NUMAQ) don't initialize apicid to 1265c4b90c11STejun Heo * node mapping during NUMA init. Now that logical apicid is 1266c4b90c11STejun Heo * guaranteed to be known, give it another chance. This is already 1267c4b90c11STejun Heo * a bit too late - percpu allocation has already happened without 1268c4b90c11STejun Heo * proper NUMA affinity. 1269c4b90c11STejun Heo */ 127084914ed0STejun Heo if (apic->x86_32_numa_cpu_node) 1271c4b90c11STejun Heo set_apicid_to_node(early_per_cpu(x86_cpu_to_apicid, cpu), 1272c4b90c11STejun Heo apic->x86_32_numa_cpu_node(cpu)); 12736f802c4bSTejun Heo #endif 12746f802c4bSTejun Heo 1275f62bae50SIngo Molnar /* 1276f62bae50SIngo Molnar * Set Task Priority to 'accept all'. We never change this 1277f62bae50SIngo Molnar * later on. 1278f62bae50SIngo Molnar */ 1279f62bae50SIngo Molnar value = apic_read(APIC_TASKPRI); 1280f62bae50SIngo Molnar value &= ~APIC_TPRI_MASK; 1281f62bae50SIngo Molnar apic_write(APIC_TASKPRI, value); 1282f62bae50SIngo Molnar 1283f62bae50SIngo Molnar /* 1284f62bae50SIngo Molnar * After a crash, we no longer service the interrupts and a pending 1285f62bae50SIngo Molnar * interrupt from previous kernel might still have ISR bit set. 1286f62bae50SIngo Molnar * 1287f62bae50SIngo Molnar * Most probably by now CPU has serviced that pending interrupt and 1288f62bae50SIngo Molnar * it might not have done the ack_APIC_irq() because it thought, 1289f62bae50SIngo Molnar * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it 1290f62bae50SIngo Molnar * does not clear the ISR bit and cpu thinks it has already serivced 1291f62bae50SIngo Molnar * the interrupt. Hence a vector might get locked. It was noticed 1292f62bae50SIngo Molnar * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. 1293f62bae50SIngo Molnar */ 12948c3ba8d0SKerstin Jonsson do { 12958c3ba8d0SKerstin Jonsson queued = 0; 12968c3ba8d0SKerstin Jonsson for (i = APIC_ISR_NR - 1; i >= 0; i--) 12978c3ba8d0SKerstin Jonsson queued |= apic_read(APIC_IRR + i*0x10); 12988c3ba8d0SKerstin Jonsson 1299f62bae50SIngo Molnar for (i = APIC_ISR_NR - 1; i >= 0; i--) { 1300f62bae50SIngo Molnar value = apic_read(APIC_ISR + i*0x10); 1301f62bae50SIngo Molnar for (j = 31; j >= 0; j--) { 13028c3ba8d0SKerstin Jonsson if (value & (1<<j)) { 1303f62bae50SIngo Molnar ack_APIC_irq(); 13048c3ba8d0SKerstin Jonsson acked++; 1305f62bae50SIngo Molnar } 1306f62bae50SIngo Molnar } 13078c3ba8d0SKerstin Jonsson } 13088c3ba8d0SKerstin Jonsson if (acked > 256) { 13098c3ba8d0SKerstin Jonsson printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n", 13108c3ba8d0SKerstin Jonsson acked); 13118c3ba8d0SKerstin Jonsson break; 13128c3ba8d0SKerstin Jonsson } 13138c3ba8d0SKerstin Jonsson if (cpu_has_tsc) { 13148c3ba8d0SKerstin Jonsson rdtscll(ntsc); 13158c3ba8d0SKerstin Jonsson max_loops = (cpu_khz << 10) - (ntsc - tsc); 13168c3ba8d0SKerstin Jonsson } else 13178c3ba8d0SKerstin Jonsson max_loops--; 13188c3ba8d0SKerstin Jonsson } while (queued && max_loops > 0); 13198c3ba8d0SKerstin Jonsson WARN_ON(max_loops <= 0); 1320f62bae50SIngo Molnar 1321f62bae50SIngo Molnar /* 1322f62bae50SIngo Molnar * Now that we are all set up, enable the APIC 1323f62bae50SIngo Molnar */ 1324f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 1325f62bae50SIngo Molnar value &= ~APIC_VECTOR_MASK; 1326f62bae50SIngo Molnar /* 1327f62bae50SIngo Molnar * Enable APIC 1328f62bae50SIngo Molnar */ 1329f62bae50SIngo Molnar value |= APIC_SPIV_APIC_ENABLED; 1330f62bae50SIngo Molnar 1331f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1332f62bae50SIngo Molnar /* 1333f62bae50SIngo Molnar * Some unknown Intel IO/APIC (or APIC) errata is biting us with 1334f62bae50SIngo Molnar * certain networking cards. If high frequency interrupts are 1335f62bae50SIngo Molnar * happening on a particular IOAPIC pin, plus the IOAPIC routing 1336f62bae50SIngo Molnar * entry is masked/unmasked at a high rate as well then sooner or 1337f62bae50SIngo Molnar * later IOAPIC line gets 'stuck', no more interrupts are received 1338f62bae50SIngo Molnar * from the device. If focus CPU is disabled then the hang goes 1339f62bae50SIngo Molnar * away, oh well :-( 1340f62bae50SIngo Molnar * 1341f62bae50SIngo Molnar * [ This bug can be reproduced easily with a level-triggered 1342f62bae50SIngo Molnar * PCI Ne2000 networking cards and PII/PIII processors, dual 1343f62bae50SIngo Molnar * BX chipset. ] 1344f62bae50SIngo Molnar */ 1345f62bae50SIngo Molnar /* 1346f62bae50SIngo Molnar * Actually disabling the focus CPU check just makes the hang less 1347f62bae50SIngo Molnar * frequent as it makes the interrupt distributon model be more 1348f62bae50SIngo Molnar * like LRU than MRU (the short-term load is more even across CPUs). 1349f62bae50SIngo Molnar * See also the comment in end_level_ioapic_irq(). --macro 1350f62bae50SIngo Molnar */ 1351f62bae50SIngo Molnar 1352f62bae50SIngo Molnar /* 1353f62bae50SIngo Molnar * - enable focus processor (bit==0) 1354f62bae50SIngo Molnar * - 64bit mode always use processor focus 1355f62bae50SIngo Molnar * so no need to set it 1356f62bae50SIngo Molnar */ 1357f62bae50SIngo Molnar value &= ~APIC_SPIV_FOCUS_DISABLED; 1358f62bae50SIngo Molnar #endif 1359f62bae50SIngo Molnar 1360f62bae50SIngo Molnar /* 1361f62bae50SIngo Molnar * Set spurious IRQ vector 1362f62bae50SIngo Molnar */ 1363f62bae50SIngo Molnar value |= SPURIOUS_APIC_VECTOR; 1364f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 1365f62bae50SIngo Molnar 1366f62bae50SIngo Molnar /* 1367f62bae50SIngo Molnar * Set up LVT0, LVT1: 1368f62bae50SIngo Molnar * 1369f62bae50SIngo Molnar * set up through-local-APIC on the BP's LINT0. This is not 1370f62bae50SIngo Molnar * strictly necessary in pure symmetric-IO mode, but sometimes 1371f62bae50SIngo Molnar * we delegate interrupts to the 8259A. 1372f62bae50SIngo Molnar */ 1373f62bae50SIngo Molnar /* 1374f62bae50SIngo Molnar * TODO: set up through-local-APIC from through-I/O-APIC? --macro 1375f62bae50SIngo Molnar */ 1376f62bae50SIngo Molnar value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; 13770aa002feSTejun Heo if (!cpu && (pic_mode || !value)) { 1378f62bae50SIngo Molnar value = APIC_DM_EXTINT; 13790aa002feSTejun Heo apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu); 1380f62bae50SIngo Molnar } else { 1381f62bae50SIngo Molnar value = APIC_DM_EXTINT | APIC_LVT_MASKED; 13820aa002feSTejun Heo apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", cpu); 1383f62bae50SIngo Molnar } 1384f62bae50SIngo Molnar apic_write(APIC_LVT0, value); 1385f62bae50SIngo Molnar 1386f62bae50SIngo Molnar /* 1387f62bae50SIngo Molnar * only the BP should see the LINT1 NMI signal, obviously. 1388f62bae50SIngo Molnar */ 13890aa002feSTejun Heo if (!cpu) 1390f62bae50SIngo Molnar value = APIC_DM_NMI; 1391f62bae50SIngo Molnar else 1392f62bae50SIngo Molnar value = APIC_DM_NMI | APIC_LVT_MASKED; 1393f62bae50SIngo Molnar if (!lapic_is_integrated()) /* 82489DX */ 1394f62bae50SIngo Molnar value |= APIC_LVT_LEVEL_TRIGGER; 1395f62bae50SIngo Molnar apic_write(APIC_LVT1, value); 1396f62bae50SIngo Molnar 1397638bee71SH. Peter Anvin #ifdef CONFIG_X86_MCE_INTEL 1398638bee71SH. Peter Anvin /* Recheck CMCI information after local APIC is up on CPU #0 */ 13990aa002feSTejun Heo if (!cpu) 1400638bee71SH. Peter Anvin cmci_recheck(); 1401638bee71SH. Peter Anvin #endif 1402f62bae50SIngo Molnar } 1403f62bae50SIngo Molnar 1404f62bae50SIngo Molnar void __cpuinit end_local_APIC_setup(void) 1405f62bae50SIngo Molnar { 1406f62bae50SIngo Molnar lapic_setup_esr(); 1407f62bae50SIngo Molnar 1408f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1409f62bae50SIngo Molnar { 1410f62bae50SIngo Molnar unsigned int value; 1411f62bae50SIngo Molnar /* Disable the local apic timer */ 1412f62bae50SIngo Molnar value = apic_read(APIC_LVTT); 1413f62bae50SIngo Molnar value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); 1414f62bae50SIngo Molnar apic_write(APIC_LVTT, value); 1415f62bae50SIngo Molnar } 1416f62bae50SIngo Molnar #endif 1417f62bae50SIngo Molnar 1418f62bae50SIngo Molnar apic_pm_activate(); 14192fb270f3SJan Beulich } 14202fb270f3SJan Beulich 14212fb270f3SJan Beulich void __init bsp_end_local_APIC_setup(void) 14222fb270f3SJan Beulich { 14232fb270f3SJan Beulich end_local_APIC_setup(); 14247f7fbf45SKenji Kaneshige 14257f7fbf45SKenji Kaneshige /* 14267f7fbf45SKenji Kaneshige * Now that local APIC setup is completed for BP, configure the fault 14277f7fbf45SKenji Kaneshige * handling for interrupt remapping. 14287f7fbf45SKenji Kaneshige */ 14292fb270f3SJan Beulich if (intr_remapping_enabled) 14307f7fbf45SKenji Kaneshige enable_drhd_fault_handling(); 14317f7fbf45SKenji Kaneshige 1432f62bae50SIngo Molnar } 1433f62bae50SIngo Molnar 1434f62bae50SIngo Molnar #ifdef CONFIG_X86_X2APIC 1435f62bae50SIngo Molnar void check_x2apic(void) 1436f62bae50SIngo Molnar { 1437ef1f87aaSSuresh Siddha if (x2apic_enabled()) { 1438f62bae50SIngo Molnar pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); 1439fc1edaf9SSuresh Siddha x2apic_preenabled = x2apic_mode = 1; 1440f62bae50SIngo Molnar } 1441f62bae50SIngo Molnar } 1442f62bae50SIngo Molnar 1443f62bae50SIngo Molnar void enable_x2apic(void) 1444f62bae50SIngo Molnar { 1445f62bae50SIngo Molnar int msr, msr2; 1446f62bae50SIngo Molnar 1447fc1edaf9SSuresh Siddha if (!x2apic_mode) 1448f62bae50SIngo Molnar return; 1449f62bae50SIngo Molnar 1450f62bae50SIngo Molnar rdmsr(MSR_IA32_APICBASE, msr, msr2); 1451f62bae50SIngo Molnar if (!(msr & X2APIC_ENABLE)) { 1452450b1e8dSMike Travis printk_once(KERN_INFO "Enabling x2apic\n"); 145325970852SNaga Chumbalkar wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, msr2); 1454f62bae50SIngo Molnar } 1455f62bae50SIngo Molnar } 145693758238SWeidong Han #endif /* CONFIG_X86_X2APIC */ 1457f62bae50SIngo Molnar 1458ce69a784SGleb Natapov int __init enable_IR(void) 1459f62bae50SIngo Molnar { 1460d3f13810SSuresh Siddha #ifdef CONFIG_IRQ_REMAP 146193758238SWeidong Han if (!intr_remapping_supported()) { 146293758238SWeidong Han pr_debug("intr-remapping not supported\n"); 146341750d31SSuresh Siddha return -1; 146493758238SWeidong Han } 146593758238SWeidong Han 146693758238SWeidong Han if (!x2apic_preenabled && skip_ioapic_setup) { 146793758238SWeidong Han pr_info("Skipped enabling intr-remap because of skipping " 146893758238SWeidong Han "io-apic setup\n"); 146941750d31SSuresh Siddha return -1; 1470f62bae50SIngo Molnar } 1471f62bae50SIngo Molnar 147241750d31SSuresh Siddha return enable_intr_remapping(); 1473ce69a784SGleb Natapov #endif 147441750d31SSuresh Siddha return -1; 1475ce69a784SGleb Natapov } 1476ce69a784SGleb Natapov 1477ce69a784SGleb Natapov void __init enable_IR_x2apic(void) 1478ce69a784SGleb Natapov { 1479ce69a784SGleb Natapov unsigned long flags; 1480ce69a784SGleb Natapov int ret, x2apic_enabled = 0; 1481e670761fSYinghai Lu int dmar_table_init_ret; 1482b7f42ab2SYinghai Lu 1483b7f42ab2SYinghai Lu dmar_table_init_ret = dmar_table_init(); 1484e670761fSYinghai Lu if (dmar_table_init_ret && !x2apic_supported()) 1485e670761fSYinghai Lu return; 1486ce69a784SGleb Natapov 148731dce14aSSuresh Siddha ret = save_ioapic_entries(); 1488f62bae50SIngo Molnar if (ret) { 1489f62bae50SIngo Molnar pr_info("Saving IO-APIC state failed: %d\n", ret); 1490ce69a784SGleb Natapov goto out; 1491f62bae50SIngo Molnar } 1492f62bae50SIngo Molnar 149305c3dc2cSSuresh Siddha local_irq_save(flags); 1494b81bb373SJacob Pan legacy_pic->mask_all(); 149531dce14aSSuresh Siddha mask_ioapic_entries(); 149605c3dc2cSSuresh Siddha 1497b7f42ab2SYinghai Lu if (dmar_table_init_ret) 149841750d31SSuresh Siddha ret = -1; 1499b7f42ab2SYinghai Lu else 1500ce69a784SGleb Natapov ret = enable_IR(); 1501b7f42ab2SYinghai Lu 150241750d31SSuresh Siddha if (ret < 0) { 1503ce69a784SGleb Natapov /* IR is required if there is APIC ID > 255 even when running 1504ce69a784SGleb Natapov * under KVM 1505ce69a784SGleb Natapov */ 15062904ed8dSSheng Yang if (max_physical_apicid > 255 || 15072904ed8dSSheng Yang !hypervisor_x2apic_available()) 1508ce69a784SGleb Natapov goto nox2apic; 1509ce69a784SGleb Natapov /* 1510ce69a784SGleb Natapov * without IR all CPUs can be addressed by IOAPIC/MSI 1511ce69a784SGleb Natapov * only in physical mode 1512ce69a784SGleb Natapov */ 1513ce69a784SGleb Natapov x2apic_force_phys(); 1514ce69a784SGleb Natapov } 1515f62bae50SIngo Molnar 151641750d31SSuresh Siddha if (ret == IRQ_REMAP_XAPIC_MODE) 151741750d31SSuresh Siddha goto nox2apic; 151841750d31SSuresh Siddha 1519ce69a784SGleb Natapov x2apic_enabled = 1; 152093758238SWeidong Han 1521fc1edaf9SSuresh Siddha if (x2apic_supported() && !x2apic_mode) { 1522fc1edaf9SSuresh Siddha x2apic_mode = 1; 1523f62bae50SIngo Molnar enable_x2apic(); 152493758238SWeidong Han pr_info("Enabled x2apic\n"); 1525f62bae50SIngo Molnar } 1526f62bae50SIngo Molnar 1527ce69a784SGleb Natapov nox2apic: 152841750d31SSuresh Siddha if (ret < 0) /* IR enabling failed */ 152931dce14aSSuresh Siddha restore_ioapic_entries(); 1530b81bb373SJacob Pan legacy_pic->restore_mask(); 1531f62bae50SIngo Molnar local_irq_restore(flags); 1532f62bae50SIngo Molnar 1533ce69a784SGleb Natapov out: 153441750d31SSuresh Siddha if (x2apic_enabled || !x2apic_supported()) 153593758238SWeidong Han return; 153693758238SWeidong Han 153793758238SWeidong Han if (x2apic_preenabled) 1538ce69a784SGleb Natapov panic("x2apic: enabled by BIOS but kernel init failed."); 153941750d31SSuresh Siddha else if (ret == IRQ_REMAP_XAPIC_MODE) 154041750d31SSuresh Siddha pr_info("x2apic not enabled, IRQ remapping is in xapic mode\n"); 154141750d31SSuresh Siddha else if (ret < 0) 154241750d31SSuresh Siddha pr_info("x2apic not enabled, IRQ remapping init failed\n"); 1543f62bae50SIngo Molnar } 154493758238SWeidong Han 1545f62bae50SIngo Molnar #ifdef CONFIG_X86_64 1546f62bae50SIngo Molnar /* 1547f62bae50SIngo Molnar * Detect and enable local APICs on non-SMP boards. 1548f62bae50SIngo Molnar * Original code written by Keir Fraser. 1549f62bae50SIngo Molnar * On AMD64 we trust the BIOS - if it says no APIC it is likely 1550f62bae50SIngo Molnar * not correctly set up (usually the APIC timer won't work etc.) 1551f62bae50SIngo Molnar */ 1552f62bae50SIngo Molnar static int __init detect_init_APIC(void) 1553f62bae50SIngo Molnar { 1554f62bae50SIngo Molnar if (!cpu_has_apic) { 1555f62bae50SIngo Molnar pr_info("No local APIC present\n"); 1556f62bae50SIngo Molnar return -1; 1557f62bae50SIngo Molnar } 1558f62bae50SIngo Molnar 1559f62bae50SIngo Molnar mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 1560f62bae50SIngo Molnar return 0; 1561f62bae50SIngo Molnar } 1562f62bae50SIngo Molnar #else 15635a7ae78fSThomas Gleixner 156425874a29SHenrik Kretzschmar static int __init apic_verify(void) 15655a7ae78fSThomas Gleixner { 15665a7ae78fSThomas Gleixner u32 features, h, l; 15675a7ae78fSThomas Gleixner 15685a7ae78fSThomas Gleixner /* 15695a7ae78fSThomas Gleixner * The APIC feature bit should now be enabled 15705a7ae78fSThomas Gleixner * in `cpuid' 15715a7ae78fSThomas Gleixner */ 15725a7ae78fSThomas Gleixner features = cpuid_edx(1); 15735a7ae78fSThomas Gleixner if (!(features & (1 << X86_FEATURE_APIC))) { 15745a7ae78fSThomas Gleixner pr_warning("Could not enable APIC!\n"); 15755a7ae78fSThomas Gleixner return -1; 15765a7ae78fSThomas Gleixner } 15775a7ae78fSThomas Gleixner set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); 15785a7ae78fSThomas Gleixner mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 15795a7ae78fSThomas Gleixner 15805a7ae78fSThomas Gleixner /* The BIOS may have set up the APIC at some other address */ 15815a7ae78fSThomas Gleixner rdmsr(MSR_IA32_APICBASE, l, h); 15825a7ae78fSThomas Gleixner if (l & MSR_IA32_APICBASE_ENABLE) 15835a7ae78fSThomas Gleixner mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; 15845a7ae78fSThomas Gleixner 15855a7ae78fSThomas Gleixner pr_info("Found and enabled local APIC!\n"); 15865a7ae78fSThomas Gleixner return 0; 15875a7ae78fSThomas Gleixner } 15885a7ae78fSThomas Gleixner 158925874a29SHenrik Kretzschmar int __init apic_force_enable(unsigned long addr) 15905a7ae78fSThomas Gleixner { 15915a7ae78fSThomas Gleixner u32 h, l; 15925a7ae78fSThomas Gleixner 15935a7ae78fSThomas Gleixner if (disable_apic) 15945a7ae78fSThomas Gleixner return -1; 15955a7ae78fSThomas Gleixner 15965a7ae78fSThomas Gleixner /* 15975a7ae78fSThomas Gleixner * Some BIOSes disable the local APIC in the APIC_BASE 15985a7ae78fSThomas Gleixner * MSR. This can only be done in software for Intel P6 or later 15995a7ae78fSThomas Gleixner * and AMD K7 (Model > 1) or later. 16005a7ae78fSThomas Gleixner */ 16015a7ae78fSThomas Gleixner rdmsr(MSR_IA32_APICBASE, l, h); 16025a7ae78fSThomas Gleixner if (!(l & MSR_IA32_APICBASE_ENABLE)) { 16035a7ae78fSThomas Gleixner pr_info("Local APIC disabled by BIOS -- reenabling.\n"); 16045a7ae78fSThomas Gleixner l &= ~MSR_IA32_APICBASE_BASE; 1605a906fdaaSThomas Gleixner l |= MSR_IA32_APICBASE_ENABLE | addr; 16065a7ae78fSThomas Gleixner wrmsr(MSR_IA32_APICBASE, l, h); 16075a7ae78fSThomas Gleixner enabled_via_apicbase = 1; 16085a7ae78fSThomas Gleixner } 16095a7ae78fSThomas Gleixner return apic_verify(); 16105a7ae78fSThomas Gleixner } 16115a7ae78fSThomas Gleixner 1612f62bae50SIngo Molnar /* 1613f62bae50SIngo Molnar * Detect and initialize APIC 1614f62bae50SIngo Molnar */ 1615f62bae50SIngo Molnar static int __init detect_init_APIC(void) 1616f62bae50SIngo Molnar { 1617f62bae50SIngo Molnar /* Disabled by kernel option? */ 1618f62bae50SIngo Molnar if (disable_apic) 1619f62bae50SIngo Molnar return -1; 1620f62bae50SIngo Molnar 1621f62bae50SIngo Molnar switch (boot_cpu_data.x86_vendor) { 1622f62bae50SIngo Molnar case X86_VENDOR_AMD: 1623f62bae50SIngo Molnar if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || 1624f62bae50SIngo Molnar (boot_cpu_data.x86 >= 15)) 1625f62bae50SIngo Molnar break; 1626f62bae50SIngo Molnar goto no_apic; 1627f62bae50SIngo Molnar case X86_VENDOR_INTEL: 1628f62bae50SIngo Molnar if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || 1629f62bae50SIngo Molnar (boot_cpu_data.x86 == 5 && cpu_has_apic)) 1630f62bae50SIngo Molnar break; 1631f62bae50SIngo Molnar goto no_apic; 1632f62bae50SIngo Molnar default: 1633f62bae50SIngo Molnar goto no_apic; 1634f62bae50SIngo Molnar } 1635f62bae50SIngo Molnar 1636f62bae50SIngo Molnar if (!cpu_has_apic) { 1637f62bae50SIngo Molnar /* 1638f62bae50SIngo Molnar * Over-ride BIOS and try to enable the local APIC only if 1639f62bae50SIngo Molnar * "lapic" specified. 1640f62bae50SIngo Molnar */ 1641f62bae50SIngo Molnar if (!force_enable_local_apic) { 1642f62bae50SIngo Molnar pr_info("Local APIC disabled by BIOS -- " 1643f62bae50SIngo Molnar "you can enable it with \"lapic\"\n"); 1644f62bae50SIngo Molnar return -1; 1645f62bae50SIngo Molnar } 1646a906fdaaSThomas Gleixner if (apic_force_enable(APIC_DEFAULT_PHYS_BASE)) 16475a7ae78fSThomas Gleixner return -1; 16485a7ae78fSThomas Gleixner } else { 16495a7ae78fSThomas Gleixner if (apic_verify()) 1650f62bae50SIngo Molnar return -1; 1651f62bae50SIngo Molnar } 1652f62bae50SIngo Molnar 1653f62bae50SIngo Molnar apic_pm_activate(); 1654f62bae50SIngo Molnar 1655f62bae50SIngo Molnar return 0; 1656f62bae50SIngo Molnar 1657f62bae50SIngo Molnar no_apic: 1658f62bae50SIngo Molnar pr_info("No local APIC present or hardware disabled\n"); 1659f62bae50SIngo Molnar return -1; 1660f62bae50SIngo Molnar } 1661f62bae50SIngo Molnar #endif 1662f62bae50SIngo Molnar 1663f62bae50SIngo Molnar /** 1664f62bae50SIngo Molnar * init_apic_mappings - initialize APIC mappings 1665f62bae50SIngo Molnar */ 1666f62bae50SIngo Molnar void __init init_apic_mappings(void) 1667f62bae50SIngo Molnar { 16684401da61SYinghai Lu unsigned int new_apicid; 16694401da61SYinghai Lu 1670fc1edaf9SSuresh Siddha if (x2apic_mode) { 1671f62bae50SIngo Molnar boot_cpu_physical_apicid = read_apic_id(); 1672f62bae50SIngo Molnar return; 1673f62bae50SIngo Molnar } 1674f62bae50SIngo Molnar 16754797f6b0SYinghai Lu /* If no local APIC can be found return early */ 1676f62bae50SIngo Molnar if (!smp_found_config && detect_init_APIC()) { 16774797f6b0SYinghai Lu /* lets NOP'ify apic operations */ 16784797f6b0SYinghai Lu pr_info("APIC: disable apic facility\n"); 16794797f6b0SYinghai Lu apic_disable(); 16804797f6b0SYinghai Lu } else { 1681f62bae50SIngo Molnar apic_phys = mp_lapic_addr; 1682f62bae50SIngo Molnar 16834401da61SYinghai Lu /* 16844401da61SYinghai Lu * acpi lapic path already maps that address in 16854401da61SYinghai Lu * acpi_register_lapic_address() 16864401da61SYinghai Lu */ 16875989cd6aSEric W. Biederman if (!acpi_lapic && !smp_found_config) 1688326a2e6bSYinghai Lu register_lapic_address(apic_phys); 1689cec6be6dSCyrill Gorcunov } 1690f62bae50SIngo Molnar 1691f62bae50SIngo Molnar /* 1692f62bae50SIngo Molnar * Fetch the APIC ID of the BSP in case we have a 1693f62bae50SIngo Molnar * default configuration (or the MP table is broken). 1694f62bae50SIngo Molnar */ 16954401da61SYinghai Lu new_apicid = read_apic_id(); 16964401da61SYinghai Lu if (boot_cpu_physical_apicid != new_apicid) { 16974401da61SYinghai Lu boot_cpu_physical_apicid = new_apicid; 1698103428e5SCyrill Gorcunov /* 1699103428e5SCyrill Gorcunov * yeah -- we lie about apic_version 1700103428e5SCyrill Gorcunov * in case if apic was disabled via boot option 1701103428e5SCyrill Gorcunov * but it's not a problem for SMP compiled kernel 1702103428e5SCyrill Gorcunov * since smp_sanity_check is prepared for such a case 1703103428e5SCyrill Gorcunov * and disable smp mode 1704103428e5SCyrill Gorcunov */ 17054401da61SYinghai Lu apic_version[new_apicid] = 17064401da61SYinghai Lu GET_APIC_VERSION(apic_read(APIC_LVR)); 170708306ce6SCyrill Gorcunov } 1708f62bae50SIngo Molnar } 1709f62bae50SIngo Molnar 1710c0104d38SYinghai Lu void __init register_lapic_address(unsigned long address) 1711c0104d38SYinghai Lu { 1712c0104d38SYinghai Lu mp_lapic_addr = address; 1713c0104d38SYinghai Lu 17140450193bSYinghai Lu if (!x2apic_mode) { 1715c0104d38SYinghai Lu set_fixmap_nocache(FIX_APIC_BASE, address); 1716f1157141SYinghai Lu apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", 1717f1157141SYinghai Lu APIC_BASE, mp_lapic_addr); 17180450193bSYinghai Lu } 1719c0104d38SYinghai Lu if (boot_cpu_physical_apicid == -1U) { 1720c0104d38SYinghai Lu boot_cpu_physical_apicid = read_apic_id(); 1721c0104d38SYinghai Lu apic_version[boot_cpu_physical_apicid] = 1722c0104d38SYinghai Lu GET_APIC_VERSION(apic_read(APIC_LVR)); 1723c0104d38SYinghai Lu } 1724c0104d38SYinghai Lu } 1725c0104d38SYinghai Lu 1726f62bae50SIngo Molnar /* 1727f62bae50SIngo Molnar * This initializes the IO-APIC and APIC hardware if this is 1728f62bae50SIngo Molnar * a UP kernel. 1729f62bae50SIngo Molnar */ 173056d91f13SYinghai Lu int apic_version[MAX_LOCAL_APIC]; 1731f62bae50SIngo Molnar 1732f62bae50SIngo Molnar int __init APIC_init_uniprocessor(void) 1733f62bae50SIngo Molnar { 1734f62bae50SIngo Molnar if (disable_apic) { 1735f62bae50SIngo Molnar pr_info("Apic disabled\n"); 1736f62bae50SIngo Molnar return -1; 1737f62bae50SIngo Molnar } 1738f62bae50SIngo Molnar #ifdef CONFIG_X86_64 1739f62bae50SIngo Molnar if (!cpu_has_apic) { 1740f62bae50SIngo Molnar disable_apic = 1; 1741f62bae50SIngo Molnar pr_info("Apic disabled by BIOS\n"); 1742f62bae50SIngo Molnar return -1; 1743f62bae50SIngo Molnar } 1744f62bae50SIngo Molnar #else 1745f62bae50SIngo Molnar if (!smp_found_config && !cpu_has_apic) 1746f62bae50SIngo Molnar return -1; 1747f62bae50SIngo Molnar 1748f62bae50SIngo Molnar /* 1749f62bae50SIngo Molnar * Complain if the BIOS pretends there is one. 1750f62bae50SIngo Molnar */ 1751f62bae50SIngo Molnar if (!cpu_has_apic && 1752f62bae50SIngo Molnar APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { 1753f62bae50SIngo Molnar pr_err("BIOS bug, local APIC 0x%x not detected!...\n", 1754f62bae50SIngo Molnar boot_cpu_physical_apicid); 1755f62bae50SIngo Molnar return -1; 1756f62bae50SIngo Molnar } 1757f62bae50SIngo Molnar #endif 1758f62bae50SIngo Molnar 1759f62bae50SIngo Molnar default_setup_apic_routing(); 1760f62bae50SIngo Molnar 1761f62bae50SIngo Molnar verify_local_APIC(); 1762f62bae50SIngo Molnar connect_bsp_APIC(); 1763f62bae50SIngo Molnar 1764f62bae50SIngo Molnar #ifdef CONFIG_X86_64 1765f62bae50SIngo Molnar apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); 1766f62bae50SIngo Molnar #else 1767f62bae50SIngo Molnar /* 1768f62bae50SIngo Molnar * Hack: In case of kdump, after a crash, kernel might be booting 1769f62bae50SIngo Molnar * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid 1770f62bae50SIngo Molnar * might be zero if read from MP tables. Get it from LAPIC. 1771f62bae50SIngo Molnar */ 1772f62bae50SIngo Molnar # ifdef CONFIG_CRASH_DUMP 1773f62bae50SIngo Molnar boot_cpu_physical_apicid = read_apic_id(); 1774f62bae50SIngo Molnar # endif 1775f62bae50SIngo Molnar #endif 1776f62bae50SIngo Molnar physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); 1777f62bae50SIngo Molnar setup_local_APIC(); 1778f62bae50SIngo Molnar 1779f62bae50SIngo Molnar #ifdef CONFIG_X86_IO_APIC 1780f62bae50SIngo Molnar /* 1781f62bae50SIngo Molnar * Now enable IO-APICs, actually call clear_IO_APIC 1782f62bae50SIngo Molnar * We need clear_IO_APIC before enabling error vector 1783f62bae50SIngo Molnar */ 1784f62bae50SIngo Molnar if (!skip_ioapic_setup && nr_ioapics) 1785f62bae50SIngo Molnar enable_IO_APIC(); 1786f62bae50SIngo Molnar #endif 1787f62bae50SIngo Molnar 17882fb270f3SJan Beulich bsp_end_local_APIC_setup(); 1789f62bae50SIngo Molnar 1790f62bae50SIngo Molnar #ifdef CONFIG_X86_IO_APIC 1791f62bae50SIngo Molnar if (smp_found_config && !skip_ioapic_setup && nr_ioapics) 1792f62bae50SIngo Molnar setup_IO_APIC(); 1793f62bae50SIngo Molnar else { 1794f62bae50SIngo Molnar nr_ioapics = 0; 1795f62bae50SIngo Molnar } 1796f62bae50SIngo Molnar #endif 1797f62bae50SIngo Molnar 1798736decacSThomas Gleixner x86_init.timers.setup_percpu_clockev(); 1799f62bae50SIngo Molnar return 0; 1800f62bae50SIngo Molnar } 1801f62bae50SIngo Molnar 1802f62bae50SIngo Molnar /* 1803f62bae50SIngo Molnar * Local APIC interrupts 1804f62bae50SIngo Molnar */ 1805f62bae50SIngo Molnar 1806f62bae50SIngo Molnar /* 1807f62bae50SIngo Molnar * This interrupt should _never_ happen with our APIC/SMP architecture 1808f62bae50SIngo Molnar */ 1809f62bae50SIngo Molnar void smp_spurious_interrupt(struct pt_regs *regs) 1810f62bae50SIngo Molnar { 1811f62bae50SIngo Molnar u32 v; 1812f62bae50SIngo Molnar 1813f62bae50SIngo Molnar exit_idle(); 1814f62bae50SIngo Molnar irq_enter(); 1815f62bae50SIngo Molnar /* 1816f62bae50SIngo Molnar * Check if this really is a spurious interrupt and ACK it 1817f62bae50SIngo Molnar * if it is a vectored one. Just in case... 1818f62bae50SIngo Molnar * Spurious interrupts should not be ACKed. 1819f62bae50SIngo Molnar */ 1820f62bae50SIngo Molnar v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); 1821f62bae50SIngo Molnar if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) 1822f62bae50SIngo Molnar ack_APIC_irq(); 1823f62bae50SIngo Molnar 1824f62bae50SIngo Molnar inc_irq_stat(irq_spurious_count); 1825f62bae50SIngo Molnar 1826f62bae50SIngo Molnar /* see sw-dev-man vol 3, chapter 7.4.13.5 */ 1827f62bae50SIngo Molnar pr_info("spurious APIC interrupt on CPU#%d, " 1828f62bae50SIngo Molnar "should never happen.\n", smp_processor_id()); 1829f62bae50SIngo Molnar irq_exit(); 1830f62bae50SIngo Molnar } 1831f62bae50SIngo Molnar 1832f62bae50SIngo Molnar /* 1833f62bae50SIngo Molnar * This interrupt should never happen with our APIC/SMP architecture 1834f62bae50SIngo Molnar */ 1835f62bae50SIngo Molnar void smp_error_interrupt(struct pt_regs *regs) 1836f62bae50SIngo Molnar { 18372b398bd9SYouquan Song u32 v0, v1; 18382b398bd9SYouquan Song u32 i = 0; 18392b398bd9SYouquan Song static const char * const error_interrupt_reason[] = { 18402b398bd9SYouquan Song "Send CS error", /* APIC Error Bit 0 */ 18412b398bd9SYouquan Song "Receive CS error", /* APIC Error Bit 1 */ 18422b398bd9SYouquan Song "Send accept error", /* APIC Error Bit 2 */ 18432b398bd9SYouquan Song "Receive accept error", /* APIC Error Bit 3 */ 18442b398bd9SYouquan Song "Redirectable IPI", /* APIC Error Bit 4 */ 18452b398bd9SYouquan Song "Send illegal vector", /* APIC Error Bit 5 */ 18462b398bd9SYouquan Song "Received illegal vector", /* APIC Error Bit 6 */ 18472b398bd9SYouquan Song "Illegal register address", /* APIC Error Bit 7 */ 18482b398bd9SYouquan Song }; 1849f62bae50SIngo Molnar 1850f62bae50SIngo Molnar exit_idle(); 1851f62bae50SIngo Molnar irq_enter(); 1852f62bae50SIngo Molnar /* First tickle the hardware, only then report what went on. -- REW */ 18532b398bd9SYouquan Song v0 = apic_read(APIC_ESR); 1854f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 1855f62bae50SIngo Molnar v1 = apic_read(APIC_ESR); 1856f62bae50SIngo Molnar ack_APIC_irq(); 1857f62bae50SIngo Molnar atomic_inc(&irq_err_count); 1858f62bae50SIngo Molnar 18592b398bd9SYouquan Song apic_printk(APIC_DEBUG, KERN_DEBUG "APIC error on CPU%d: %02x(%02x)", 18602b398bd9SYouquan Song smp_processor_id(), v0 , v1); 18612b398bd9SYouquan Song 18622b398bd9SYouquan Song v1 = v1 & 0xff; 18632b398bd9SYouquan Song while (v1) { 18642b398bd9SYouquan Song if (v1 & 0x1) 18652b398bd9SYouquan Song apic_printk(APIC_DEBUG, KERN_CONT " : %s", error_interrupt_reason[i]); 18662b398bd9SYouquan Song i++; 18672b398bd9SYouquan Song v1 >>= 1; 18682b398bd9SYouquan Song }; 18692b398bd9SYouquan Song 18702b398bd9SYouquan Song apic_printk(APIC_DEBUG, KERN_CONT "\n"); 18712b398bd9SYouquan Song 1872f62bae50SIngo Molnar irq_exit(); 1873f62bae50SIngo Molnar } 1874f62bae50SIngo Molnar 1875f62bae50SIngo Molnar /** 1876f62bae50SIngo Molnar * connect_bsp_APIC - attach the APIC to the interrupt system 1877f62bae50SIngo Molnar */ 1878f62bae50SIngo Molnar void __init connect_bsp_APIC(void) 1879f62bae50SIngo Molnar { 1880f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1881f62bae50SIngo Molnar if (pic_mode) { 1882f62bae50SIngo Molnar /* 1883f62bae50SIngo Molnar * Do not trust the local APIC being empty at bootup. 1884f62bae50SIngo Molnar */ 1885f62bae50SIngo Molnar clear_local_APIC(); 1886f62bae50SIngo Molnar /* 1887f62bae50SIngo Molnar * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's 1888f62bae50SIngo Molnar * local APIC to INT and NMI lines. 1889f62bae50SIngo Molnar */ 1890f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "leaving PIC mode, " 1891f62bae50SIngo Molnar "enabling APIC mode.\n"); 1892c0eaa453SCyrill Gorcunov imcr_pic_to_apic(); 1893f62bae50SIngo Molnar } 1894f62bae50SIngo Molnar #endif 1895f62bae50SIngo Molnar if (apic->enable_apic_mode) 1896f62bae50SIngo Molnar apic->enable_apic_mode(); 1897f62bae50SIngo Molnar } 1898f62bae50SIngo Molnar 1899f62bae50SIngo Molnar /** 1900f62bae50SIngo Molnar * disconnect_bsp_APIC - detach the APIC from the interrupt system 1901f62bae50SIngo Molnar * @virt_wire_setup: indicates, whether virtual wire mode is selected 1902f62bae50SIngo Molnar * 1903f62bae50SIngo Molnar * Virtual wire mode is necessary to deliver legacy interrupts even when the 1904f62bae50SIngo Molnar * APIC is disabled. 1905f62bae50SIngo Molnar */ 1906f62bae50SIngo Molnar void disconnect_bsp_APIC(int virt_wire_setup) 1907f62bae50SIngo Molnar { 1908f62bae50SIngo Molnar unsigned int value; 1909f62bae50SIngo Molnar 1910f62bae50SIngo Molnar #ifdef CONFIG_X86_32 1911f62bae50SIngo Molnar if (pic_mode) { 1912f62bae50SIngo Molnar /* 1913f62bae50SIngo Molnar * Put the board back into PIC mode (has an effect only on 1914f62bae50SIngo Molnar * certain older boards). Note that APIC interrupts, including 1915f62bae50SIngo Molnar * IPIs, won't work beyond this point! The only exception are 1916f62bae50SIngo Molnar * INIT IPIs. 1917f62bae50SIngo Molnar */ 1918f62bae50SIngo Molnar apic_printk(APIC_VERBOSE, "disabling APIC mode, " 1919f62bae50SIngo Molnar "entering PIC mode.\n"); 1920c0eaa453SCyrill Gorcunov imcr_apic_to_pic(); 1921f62bae50SIngo Molnar return; 1922f62bae50SIngo Molnar } 1923f62bae50SIngo Molnar #endif 1924f62bae50SIngo Molnar 1925f62bae50SIngo Molnar /* Go back to Virtual Wire compatibility mode */ 1926f62bae50SIngo Molnar 1927f62bae50SIngo Molnar /* For the spurious interrupt use vector F, and enable it */ 1928f62bae50SIngo Molnar value = apic_read(APIC_SPIV); 1929f62bae50SIngo Molnar value &= ~APIC_VECTOR_MASK; 1930f62bae50SIngo Molnar value |= APIC_SPIV_APIC_ENABLED; 1931f62bae50SIngo Molnar value |= 0xf; 1932f62bae50SIngo Molnar apic_write(APIC_SPIV, value); 1933f62bae50SIngo Molnar 1934f62bae50SIngo Molnar if (!virt_wire_setup) { 1935f62bae50SIngo Molnar /* 1936f62bae50SIngo Molnar * For LVT0 make it edge triggered, active high, 1937f62bae50SIngo Molnar * external and enabled 1938f62bae50SIngo Molnar */ 1939f62bae50SIngo Molnar value = apic_read(APIC_LVT0); 1940f62bae50SIngo Molnar value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | 1941f62bae50SIngo Molnar APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | 1942f62bae50SIngo Molnar APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); 1943f62bae50SIngo Molnar value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; 1944f62bae50SIngo Molnar value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); 1945f62bae50SIngo Molnar apic_write(APIC_LVT0, value); 1946f62bae50SIngo Molnar } else { 1947f62bae50SIngo Molnar /* Disable LVT0 */ 1948f62bae50SIngo Molnar apic_write(APIC_LVT0, APIC_LVT_MASKED); 1949f62bae50SIngo Molnar } 1950f62bae50SIngo Molnar 1951f62bae50SIngo Molnar /* 1952f62bae50SIngo Molnar * For LVT1 make it edge triggered, active high, 1953f62bae50SIngo Molnar * nmi and enabled 1954f62bae50SIngo Molnar */ 1955f62bae50SIngo Molnar value = apic_read(APIC_LVT1); 1956f62bae50SIngo Molnar value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | 1957f62bae50SIngo Molnar APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | 1958f62bae50SIngo Molnar APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); 1959f62bae50SIngo Molnar value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; 1960f62bae50SIngo Molnar value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); 1961f62bae50SIngo Molnar apic_write(APIC_LVT1, value); 1962f62bae50SIngo Molnar } 1963f62bae50SIngo Molnar 1964f62bae50SIngo Molnar void __cpuinit generic_processor_info(int apicid, int version) 1965f62bae50SIngo Molnar { 196614cb6dcfSVivek Goyal int cpu, max = nr_cpu_ids; 196714cb6dcfSVivek Goyal bool boot_cpu_detected = physid_isset(boot_cpu_physical_apicid, 196814cb6dcfSVivek Goyal phys_cpu_present_map); 196914cb6dcfSVivek Goyal 197014cb6dcfSVivek Goyal /* 197114cb6dcfSVivek Goyal * If boot cpu has not been detected yet, then only allow upto 197214cb6dcfSVivek Goyal * nr_cpu_ids - 1 processors and keep one slot free for boot cpu 197314cb6dcfSVivek Goyal */ 197414cb6dcfSVivek Goyal if (!boot_cpu_detected && num_processors >= nr_cpu_ids - 1 && 197514cb6dcfSVivek Goyal apicid != boot_cpu_physical_apicid) { 197614cb6dcfSVivek Goyal int thiscpu = max + disabled_cpus - 1; 197714cb6dcfSVivek Goyal 197814cb6dcfSVivek Goyal pr_warning( 197914cb6dcfSVivek Goyal "ACPI: NR_CPUS/possible_cpus limit of %i almost" 198014cb6dcfSVivek Goyal " reached. Keeping one slot for boot cpu." 198114cb6dcfSVivek Goyal " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); 198214cb6dcfSVivek Goyal 198314cb6dcfSVivek Goyal disabled_cpus++; 198414cb6dcfSVivek Goyal return; 198514cb6dcfSVivek Goyal } 1986f62bae50SIngo Molnar 1987f62bae50SIngo Molnar if (num_processors >= nr_cpu_ids) { 1988f62bae50SIngo Molnar int thiscpu = max + disabled_cpus; 1989f62bae50SIngo Molnar 1990f62bae50SIngo Molnar pr_warning( 1991f62bae50SIngo Molnar "ACPI: NR_CPUS/possible_cpus limit of %i reached." 1992f62bae50SIngo Molnar " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); 1993f62bae50SIngo Molnar 1994f62bae50SIngo Molnar disabled_cpus++; 1995f62bae50SIngo Molnar return; 1996f62bae50SIngo Molnar } 1997f62bae50SIngo Molnar 1998f62bae50SIngo Molnar num_processors++; 1999f62bae50SIngo Molnar if (apicid == boot_cpu_physical_apicid) { 2000f62bae50SIngo Molnar /* 2001f62bae50SIngo Molnar * x86_bios_cpu_apicid is required to have processors listed 2002f62bae50SIngo Molnar * in same order as logical cpu numbers. Hence the first 2003f62bae50SIngo Molnar * entry is BSP, and so on. 2004e5fea868SYinghai Lu * boot_cpu_init() already hold bit 0 in cpu_present_mask 2005e5fea868SYinghai Lu * for BSP. 2006f62bae50SIngo Molnar */ 2007f62bae50SIngo Molnar cpu = 0; 2008e5fea868SYinghai Lu } else 2009e5fea868SYinghai Lu cpu = cpumask_next_zero(-1, cpu_present_mask); 2010e5fea868SYinghai Lu 2011e5fea868SYinghai Lu /* 2012e5fea868SYinghai Lu * Validate version 2013e5fea868SYinghai Lu */ 2014e5fea868SYinghai Lu if (version == 0x0) { 2015e5fea868SYinghai Lu pr_warning("BIOS bug: APIC version is 0 for CPU %d/0x%x, fixing up to 0x10\n", 2016e5fea868SYinghai Lu cpu, apicid); 2017e5fea868SYinghai Lu version = 0x10; 2018f62bae50SIngo Molnar } 2019e5fea868SYinghai Lu apic_version[apicid] = version; 2020e5fea868SYinghai Lu 2021e5fea868SYinghai Lu if (version != apic_version[boot_cpu_physical_apicid]) { 2022e5fea868SYinghai Lu pr_warning("BIOS bug: APIC version mismatch, boot CPU: %x, CPU %d: version %x\n", 2023e5fea868SYinghai Lu apic_version[boot_cpu_physical_apicid], cpu, version); 2024e5fea868SYinghai Lu } 2025e5fea868SYinghai Lu 2026e5fea868SYinghai Lu physid_set(apicid, phys_cpu_present_map); 2027f62bae50SIngo Molnar if (apicid > max_physical_apicid) 2028f62bae50SIngo Molnar max_physical_apicid = apicid; 2029f62bae50SIngo Molnar 2030f62bae50SIngo Molnar #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) 2031f62bae50SIngo Molnar early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; 2032f62bae50SIngo Molnar early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; 2033f62bae50SIngo Molnar #endif 2034acb8bc09STejun Heo #ifdef CONFIG_X86_32 2035acb8bc09STejun Heo early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 2036acb8bc09STejun Heo apic->x86_32_early_logical_apicid(cpu); 2037acb8bc09STejun Heo #endif 2038f62bae50SIngo Molnar set_cpu_possible(cpu, true); 2039f62bae50SIngo Molnar set_cpu_present(cpu, true); 2040f62bae50SIngo Molnar } 2041f62bae50SIngo Molnar 2042f62bae50SIngo Molnar int hard_smp_processor_id(void) 2043f62bae50SIngo Molnar { 2044f62bae50SIngo Molnar return read_apic_id(); 2045f62bae50SIngo Molnar } 2046f62bae50SIngo Molnar 2047f62bae50SIngo Molnar void default_init_apic_ldr(void) 2048f62bae50SIngo Molnar { 2049f62bae50SIngo Molnar unsigned long val; 2050f62bae50SIngo Molnar 2051f62bae50SIngo Molnar apic_write(APIC_DFR, APIC_DFR_VALUE); 2052f62bae50SIngo Molnar val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 2053f62bae50SIngo Molnar val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); 2054f62bae50SIngo Molnar apic_write(APIC_LDR, val); 2055f62bae50SIngo Molnar } 2056f62bae50SIngo Molnar 2057f62bae50SIngo Molnar /* 2058f62bae50SIngo Molnar * Power management 2059f62bae50SIngo Molnar */ 2060f62bae50SIngo Molnar #ifdef CONFIG_PM 2061f62bae50SIngo Molnar 2062f62bae50SIngo Molnar static struct { 2063f62bae50SIngo Molnar /* 2064f62bae50SIngo Molnar * 'active' is true if the local APIC was enabled by us and 2065f62bae50SIngo Molnar * not the BIOS; this signifies that we are also responsible 2066f62bae50SIngo Molnar * for disabling it before entering apm/acpi suspend 2067f62bae50SIngo Molnar */ 2068f62bae50SIngo Molnar int active; 2069f62bae50SIngo Molnar /* r/w apic fields */ 2070f62bae50SIngo Molnar unsigned int apic_id; 2071f62bae50SIngo Molnar unsigned int apic_taskpri; 2072f62bae50SIngo Molnar unsigned int apic_ldr; 2073f62bae50SIngo Molnar unsigned int apic_dfr; 2074f62bae50SIngo Molnar unsigned int apic_spiv; 2075f62bae50SIngo Molnar unsigned int apic_lvtt; 2076f62bae50SIngo Molnar unsigned int apic_lvtpc; 2077f62bae50SIngo Molnar unsigned int apic_lvt0; 2078f62bae50SIngo Molnar unsigned int apic_lvt1; 2079f62bae50SIngo Molnar unsigned int apic_lvterr; 2080f62bae50SIngo Molnar unsigned int apic_tmict; 2081f62bae50SIngo Molnar unsigned int apic_tdcr; 2082f62bae50SIngo Molnar unsigned int apic_thmr; 2083f62bae50SIngo Molnar } apic_pm_state; 2084f62bae50SIngo Molnar 2085f3c6ea1bSRafael J. Wysocki static int lapic_suspend(void) 2086f62bae50SIngo Molnar { 2087f62bae50SIngo Molnar unsigned long flags; 2088f62bae50SIngo Molnar int maxlvt; 2089f62bae50SIngo Molnar 2090f62bae50SIngo Molnar if (!apic_pm_state.active) 2091f62bae50SIngo Molnar return 0; 2092f62bae50SIngo Molnar 2093f62bae50SIngo Molnar maxlvt = lapic_get_maxlvt(); 2094f62bae50SIngo Molnar 2095f62bae50SIngo Molnar apic_pm_state.apic_id = apic_read(APIC_ID); 2096f62bae50SIngo Molnar apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); 2097f62bae50SIngo Molnar apic_pm_state.apic_ldr = apic_read(APIC_LDR); 2098f62bae50SIngo Molnar apic_pm_state.apic_dfr = apic_read(APIC_DFR); 2099f62bae50SIngo Molnar apic_pm_state.apic_spiv = apic_read(APIC_SPIV); 2100f62bae50SIngo Molnar apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); 2101f62bae50SIngo Molnar if (maxlvt >= 4) 2102f62bae50SIngo Molnar apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); 2103f62bae50SIngo Molnar apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); 2104f62bae50SIngo Molnar apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); 2105f62bae50SIngo Molnar apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); 2106f62bae50SIngo Molnar apic_pm_state.apic_tmict = apic_read(APIC_TMICT); 2107f62bae50SIngo Molnar apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); 21084efc0670SAndi Kleen #ifdef CONFIG_X86_THERMAL_VECTOR 2109f62bae50SIngo Molnar if (maxlvt >= 5) 2110f62bae50SIngo Molnar apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); 2111f62bae50SIngo Molnar #endif 2112f62bae50SIngo Molnar 2113f62bae50SIngo Molnar local_irq_save(flags); 2114f62bae50SIngo Molnar disable_local_APIC(); 2115fc1edaf9SSuresh Siddha 2116b24696bcSFenghua Yu if (intr_remapping_enabled) 2117b24696bcSFenghua Yu disable_intr_remapping(); 2118fc1edaf9SSuresh Siddha 2119f62bae50SIngo Molnar local_irq_restore(flags); 2120f62bae50SIngo Molnar return 0; 2121f62bae50SIngo Molnar } 2122f62bae50SIngo Molnar 2123f3c6ea1bSRafael J. Wysocki static void lapic_resume(void) 2124f62bae50SIngo Molnar { 2125f62bae50SIngo Molnar unsigned int l, h; 2126f62bae50SIngo Molnar unsigned long flags; 212731dce14aSSuresh Siddha int maxlvt; 2128b24696bcSFenghua Yu 2129f62bae50SIngo Molnar if (!apic_pm_state.active) 2130f3c6ea1bSRafael J. Wysocki return; 2131f62bae50SIngo Molnar 2132b24696bcSFenghua Yu local_irq_save(flags); 21339a2755c3SWeidong Han if (intr_remapping_enabled) { 213431dce14aSSuresh Siddha /* 213531dce14aSSuresh Siddha * IO-APIC and PIC have their own resume routines. 213631dce14aSSuresh Siddha * We just mask them here to make sure the interrupt 213731dce14aSSuresh Siddha * subsystem is completely quiet while we enable x2apic 213831dce14aSSuresh Siddha * and interrupt-remapping. 213931dce14aSSuresh Siddha */ 214031dce14aSSuresh Siddha mask_ioapic_entries(); 2141b81bb373SJacob Pan legacy_pic->mask_all(); 2142b24696bcSFenghua Yu } 2143f62bae50SIngo Molnar 2144fc1edaf9SSuresh Siddha if (x2apic_mode) 2145f62bae50SIngo Molnar enable_x2apic(); 2146cf6567feSSuresh Siddha else { 2147f62bae50SIngo Molnar /* 2148f62bae50SIngo Molnar * Make sure the APICBASE points to the right address 2149f62bae50SIngo Molnar * 2150f62bae50SIngo Molnar * FIXME! This will be wrong if we ever support suspend on 2151f62bae50SIngo Molnar * SMP! We'll need to do this as part of the CPU restore! 2152f62bae50SIngo Molnar */ 2153f62bae50SIngo Molnar rdmsr(MSR_IA32_APICBASE, l, h); 2154f62bae50SIngo Molnar l &= ~MSR_IA32_APICBASE_BASE; 2155f62bae50SIngo Molnar l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; 2156f62bae50SIngo Molnar wrmsr(MSR_IA32_APICBASE, l, h); 2157f62bae50SIngo Molnar } 2158f62bae50SIngo Molnar 2159b24696bcSFenghua Yu maxlvt = lapic_get_maxlvt(); 2160f62bae50SIngo Molnar apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); 2161f62bae50SIngo Molnar apic_write(APIC_ID, apic_pm_state.apic_id); 2162f62bae50SIngo Molnar apic_write(APIC_DFR, apic_pm_state.apic_dfr); 2163f62bae50SIngo Molnar apic_write(APIC_LDR, apic_pm_state.apic_ldr); 2164f62bae50SIngo Molnar apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); 2165f62bae50SIngo Molnar apic_write(APIC_SPIV, apic_pm_state.apic_spiv); 2166f62bae50SIngo Molnar apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); 2167f62bae50SIngo Molnar apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); 2168f62bae50SIngo Molnar #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) 2169f62bae50SIngo Molnar if (maxlvt >= 5) 2170f62bae50SIngo Molnar apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); 2171f62bae50SIngo Molnar #endif 2172f62bae50SIngo Molnar if (maxlvt >= 4) 2173f62bae50SIngo Molnar apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); 2174f62bae50SIngo Molnar apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); 2175f62bae50SIngo Molnar apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); 2176f62bae50SIngo Molnar apic_write(APIC_TMICT, apic_pm_state.apic_tmict); 2177f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 2178f62bae50SIngo Molnar apic_read(APIC_ESR); 2179f62bae50SIngo Molnar apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); 2180f62bae50SIngo Molnar apic_write(APIC_ESR, 0); 2181f62bae50SIngo Molnar apic_read(APIC_ESR); 2182f62bae50SIngo Molnar 218331dce14aSSuresh Siddha if (intr_remapping_enabled) 2184fc1edaf9SSuresh Siddha reenable_intr_remapping(x2apic_mode); 218531dce14aSSuresh Siddha 2186f62bae50SIngo Molnar local_irq_restore(flags); 2187f62bae50SIngo Molnar } 2188f62bae50SIngo Molnar 2189f62bae50SIngo Molnar /* 2190f62bae50SIngo Molnar * This device has no shutdown method - fully functioning local APICs 2191f62bae50SIngo Molnar * are needed on every CPU up until machine_halt/restart/poweroff. 2192f62bae50SIngo Molnar */ 2193f62bae50SIngo Molnar 2194f3c6ea1bSRafael J. Wysocki static struct syscore_ops lapic_syscore_ops = { 2195f62bae50SIngo Molnar .resume = lapic_resume, 2196f62bae50SIngo Molnar .suspend = lapic_suspend, 2197f62bae50SIngo Molnar }; 2198f62bae50SIngo Molnar 2199f62bae50SIngo Molnar static void __cpuinit apic_pm_activate(void) 2200f62bae50SIngo Molnar { 2201f62bae50SIngo Molnar apic_pm_state.active = 1; 2202f62bae50SIngo Molnar } 2203f62bae50SIngo Molnar 2204f62bae50SIngo Molnar static int __init init_lapic_sysfs(void) 2205f62bae50SIngo Molnar { 2206f62bae50SIngo Molnar /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ 2207f3c6ea1bSRafael J. Wysocki if (cpu_has_apic) 2208f3c6ea1bSRafael J. Wysocki register_syscore_ops(&lapic_syscore_ops); 2209f62bae50SIngo Molnar 2210f3c6ea1bSRafael J. Wysocki return 0; 2211f62bae50SIngo Molnar } 2212b24696bcSFenghua Yu 2213b24696bcSFenghua Yu /* local apic needs to resume before other devices access its registers. */ 2214b24696bcSFenghua Yu core_initcall(init_lapic_sysfs); 2215f62bae50SIngo Molnar 2216f62bae50SIngo Molnar #else /* CONFIG_PM */ 2217f62bae50SIngo Molnar 2218f62bae50SIngo Molnar static void apic_pm_activate(void) { } 2219f62bae50SIngo Molnar 2220f62bae50SIngo Molnar #endif /* CONFIG_PM */ 2221f62bae50SIngo Molnar 2222f62bae50SIngo Molnar #ifdef CONFIG_X86_64 2223e0e42142SYinghai Lu 2224e0e42142SYinghai Lu static int __cpuinit apic_cluster_num(void) 2225f62bae50SIngo Molnar { 2226f62bae50SIngo Molnar int i, clusters, zeros; 2227f62bae50SIngo Molnar unsigned id; 2228f62bae50SIngo Molnar u16 *bios_cpu_apicid; 2229f62bae50SIngo Molnar DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); 2230f62bae50SIngo Molnar 2231f62bae50SIngo Molnar bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); 2232f62bae50SIngo Molnar bitmap_zero(clustermap, NUM_APIC_CLUSTERS); 2233f62bae50SIngo Molnar 2234f62bae50SIngo Molnar for (i = 0; i < nr_cpu_ids; i++) { 2235f62bae50SIngo Molnar /* are we being called early in kernel startup? */ 2236f62bae50SIngo Molnar if (bios_cpu_apicid) { 2237f62bae50SIngo Molnar id = bios_cpu_apicid[i]; 2238f62bae50SIngo Molnar } else if (i < nr_cpu_ids) { 2239f62bae50SIngo Molnar if (cpu_present(i)) 2240f62bae50SIngo Molnar id = per_cpu(x86_bios_cpu_apicid, i); 2241f62bae50SIngo Molnar else 2242f62bae50SIngo Molnar continue; 2243f62bae50SIngo Molnar } else 2244f62bae50SIngo Molnar break; 2245f62bae50SIngo Molnar 2246f62bae50SIngo Molnar if (id != BAD_APICID) 2247f62bae50SIngo Molnar __set_bit(APIC_CLUSTERID(id), clustermap); 2248f62bae50SIngo Molnar } 2249f62bae50SIngo Molnar 2250f62bae50SIngo Molnar /* Problem: Partially populated chassis may not have CPUs in some of 2251f62bae50SIngo Molnar * the APIC clusters they have been allocated. Only present CPUs have 2252f62bae50SIngo Molnar * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. 2253f62bae50SIngo Molnar * Since clusters are allocated sequentially, count zeros only if 2254f62bae50SIngo Molnar * they are bounded by ones. 2255f62bae50SIngo Molnar */ 2256f62bae50SIngo Molnar clusters = 0; 2257f62bae50SIngo Molnar zeros = 0; 2258f62bae50SIngo Molnar for (i = 0; i < NUM_APIC_CLUSTERS; i++) { 2259f62bae50SIngo Molnar if (test_bit(i, clustermap)) { 2260f62bae50SIngo Molnar clusters += 1 + zeros; 2261f62bae50SIngo Molnar zeros = 0; 2262f62bae50SIngo Molnar } else 2263f62bae50SIngo Molnar ++zeros; 2264f62bae50SIngo Molnar } 2265f62bae50SIngo Molnar 2266e0e42142SYinghai Lu return clusters; 2267e0e42142SYinghai Lu } 2268e0e42142SYinghai Lu 2269e0e42142SYinghai Lu static int __cpuinitdata multi_checked; 2270e0e42142SYinghai Lu static int __cpuinitdata multi; 2271e0e42142SYinghai Lu 2272e0e42142SYinghai Lu static int __cpuinit set_multi(const struct dmi_system_id *d) 2273e0e42142SYinghai Lu { 2274e0e42142SYinghai Lu if (multi) 2275e0e42142SYinghai Lu return 0; 22766f0aced6SCyrill Gorcunov pr_info("APIC: %s detected, Multi Chassis\n", d->ident); 2277e0e42142SYinghai Lu multi = 1; 2278e0e42142SYinghai Lu return 0; 2279e0e42142SYinghai Lu } 2280e0e42142SYinghai Lu 2281e0e42142SYinghai Lu static const __cpuinitconst struct dmi_system_id multi_dmi_table[] = { 2282e0e42142SYinghai Lu { 2283e0e42142SYinghai Lu .callback = set_multi, 2284e0e42142SYinghai Lu .ident = "IBM System Summit2", 2285e0e42142SYinghai Lu .matches = { 2286e0e42142SYinghai Lu DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2287e0e42142SYinghai Lu DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"), 2288e0e42142SYinghai Lu }, 2289e0e42142SYinghai Lu }, 2290e0e42142SYinghai Lu {} 2291e0e42142SYinghai Lu }; 2292e0e42142SYinghai Lu 2293e0e42142SYinghai Lu static void __cpuinit dmi_check_multi(void) 2294e0e42142SYinghai Lu { 2295e0e42142SYinghai Lu if (multi_checked) 2296e0e42142SYinghai Lu return; 2297e0e42142SYinghai Lu 2298e0e42142SYinghai Lu dmi_check_system(multi_dmi_table); 2299e0e42142SYinghai Lu multi_checked = 1; 2300e0e42142SYinghai Lu } 2301f62bae50SIngo Molnar 2302f62bae50SIngo Molnar /* 2303e0e42142SYinghai Lu * apic_is_clustered_box() -- Check if we can expect good TSC 2304e0e42142SYinghai Lu * 2305e0e42142SYinghai Lu * Thus far, the major user of this is IBM's Summit2 series: 2306e0e42142SYinghai Lu * Clustered boxes may have unsynced TSC problems if they are 2307e0e42142SYinghai Lu * multi-chassis. 2308e0e42142SYinghai Lu * Use DMI to check them 2309f62bae50SIngo Molnar */ 2310e0e42142SYinghai Lu __cpuinit int apic_is_clustered_box(void) 2311e0e42142SYinghai Lu { 2312e0e42142SYinghai Lu dmi_check_multi(); 2313e0e42142SYinghai Lu if (multi) 2314e0e42142SYinghai Lu return 1; 2315e0e42142SYinghai Lu 2316e0e42142SYinghai Lu if (!is_vsmp_box()) 2317e0e42142SYinghai Lu return 0; 2318e0e42142SYinghai Lu 2319e0e42142SYinghai Lu /* 2320e0e42142SYinghai Lu * ScaleMP vSMPowered boxes have one cluster per board and TSCs are 2321e0e42142SYinghai Lu * not guaranteed to be synced between boards 2322e0e42142SYinghai Lu */ 2323e0e42142SYinghai Lu if (apic_cluster_num() > 1) 2324e0e42142SYinghai Lu return 1; 2325e0e42142SYinghai Lu 2326e0e42142SYinghai Lu return 0; 2327f62bae50SIngo Molnar } 2328f62bae50SIngo Molnar #endif 2329f62bae50SIngo Molnar 2330f62bae50SIngo Molnar /* 2331f62bae50SIngo Molnar * APIC command line parameters 2332f62bae50SIngo Molnar */ 2333f62bae50SIngo Molnar static int __init setup_disableapic(char *arg) 2334f62bae50SIngo Molnar { 2335f62bae50SIngo Molnar disable_apic = 1; 2336f62bae50SIngo Molnar setup_clear_cpu_cap(X86_FEATURE_APIC); 2337f62bae50SIngo Molnar return 0; 2338f62bae50SIngo Molnar } 2339f62bae50SIngo Molnar early_param("disableapic", setup_disableapic); 2340f62bae50SIngo Molnar 2341f62bae50SIngo Molnar /* same as disableapic, for compatibility */ 2342f62bae50SIngo Molnar static int __init setup_nolapic(char *arg) 2343f62bae50SIngo Molnar { 2344f62bae50SIngo Molnar return setup_disableapic(arg); 2345f62bae50SIngo Molnar } 2346f62bae50SIngo Molnar early_param("nolapic", setup_nolapic); 2347f62bae50SIngo Molnar 2348f62bae50SIngo Molnar static int __init parse_lapic_timer_c2_ok(char *arg) 2349f62bae50SIngo Molnar { 2350f62bae50SIngo Molnar local_apic_timer_c2_ok = 1; 2351f62bae50SIngo Molnar return 0; 2352f62bae50SIngo Molnar } 2353f62bae50SIngo Molnar early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); 2354f62bae50SIngo Molnar 2355f62bae50SIngo Molnar static int __init parse_disable_apic_timer(char *arg) 2356f62bae50SIngo Molnar { 2357f62bae50SIngo Molnar disable_apic_timer = 1; 2358f62bae50SIngo Molnar return 0; 2359f62bae50SIngo Molnar } 2360f62bae50SIngo Molnar early_param("noapictimer", parse_disable_apic_timer); 2361f62bae50SIngo Molnar 2362f62bae50SIngo Molnar static int __init parse_nolapic_timer(char *arg) 2363f62bae50SIngo Molnar { 2364f62bae50SIngo Molnar disable_apic_timer = 1; 2365f62bae50SIngo Molnar return 0; 2366f62bae50SIngo Molnar } 2367f62bae50SIngo Molnar early_param("nolapic_timer", parse_nolapic_timer); 2368f62bae50SIngo Molnar 2369f62bae50SIngo Molnar static int __init apic_set_verbosity(char *arg) 2370f62bae50SIngo Molnar { 2371f62bae50SIngo Molnar if (!arg) { 2372f62bae50SIngo Molnar #ifdef CONFIG_X86_64 2373f62bae50SIngo Molnar skip_ioapic_setup = 0; 2374f62bae50SIngo Molnar return 0; 2375f62bae50SIngo Molnar #endif 2376f62bae50SIngo Molnar return -EINVAL; 2377f62bae50SIngo Molnar } 2378f62bae50SIngo Molnar 2379f62bae50SIngo Molnar if (strcmp("debug", arg) == 0) 2380f62bae50SIngo Molnar apic_verbosity = APIC_DEBUG; 2381f62bae50SIngo Molnar else if (strcmp("verbose", arg) == 0) 2382f62bae50SIngo Molnar apic_verbosity = APIC_VERBOSE; 2383f62bae50SIngo Molnar else { 2384f62bae50SIngo Molnar pr_warning("APIC Verbosity level %s not recognised" 2385f62bae50SIngo Molnar " use apic=verbose or apic=debug\n", arg); 2386f62bae50SIngo Molnar return -EINVAL; 2387f62bae50SIngo Molnar } 2388f62bae50SIngo Molnar 2389f62bae50SIngo Molnar return 0; 2390f62bae50SIngo Molnar } 2391f62bae50SIngo Molnar early_param("apic", apic_set_verbosity); 2392f62bae50SIngo Molnar 2393f62bae50SIngo Molnar static int __init lapic_insert_resource(void) 2394f62bae50SIngo Molnar { 2395f62bae50SIngo Molnar if (!apic_phys) 2396f62bae50SIngo Molnar return -1; 2397f62bae50SIngo Molnar 2398f62bae50SIngo Molnar /* Put local APIC into the resource map. */ 2399f62bae50SIngo Molnar lapic_resource.start = apic_phys; 2400f62bae50SIngo Molnar lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; 2401f62bae50SIngo Molnar insert_resource(&iomem_resource, &lapic_resource); 2402f62bae50SIngo Molnar 2403f62bae50SIngo Molnar return 0; 2404f62bae50SIngo Molnar } 2405f62bae50SIngo Molnar 2406f62bae50SIngo Molnar /* 2407f62bae50SIngo Molnar * need call insert after e820_reserve_resources() 2408f62bae50SIngo Molnar * that is using request_resource 2409f62bae50SIngo Molnar */ 2410f62bae50SIngo Molnar late_initcall(lapic_insert_resource); 2411