Commit 2451d1e5 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 apic updates from Ingo Molnar:
 "The main x86 APIC/IOAPIC changes in this cycle were:

   - Robustify kexec support to more carefully restore IRQ hardware
     state before calling into kexec/kdump kernels. (Baoquan He)

   - Clean up the local APIC code a bit (Dou Liyang)

   - Remove unused callbacks (David Rientjes)"

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/apic: Finish removing unused callbacks
  x86/apic: Drop logical_smp_processor_id() inline
  x86/apic: Modernize the pending interrupt code
  x86/apic: Move pending interrupt check code into it's own function
  x86/apic: Set up through-local-APIC mode on the boot CPU if 'noapic' specified
  x86/apic: Rename variables and functions related to x86_io_apic_ops
  x86/apic: Remove the (now) unused disable_IO_APIC() function
  x86/apic: Fix restoring boot IRQ mode in reboot and kexec/kdump
  x86/apic: Split disable_IO_APIC() into two functions to fix CONFIG_KEXEC_JUMP=y
  x86/apic: Split out restore_boot_irq_mode() from disable_IO_APIC()
  x86/apic: Make setup_local_APIC() static
  x86/apic: Simplify init_bsp_APIC() usage
  x86/x2apic: Mark set_x2apic_phys_mode() as __init
parents 67dbfc14 e25283bf
......@@ -138,7 +138,6 @@ extern void lapic_shutdown(void);
extern void sync_Arb_IDs(void);
extern void init_bsp_APIC(void);
extern void apic_intr_mode_init(void);
extern void setup_local_APIC(void);
extern void init_apic_mappings(void);
void register_lapic_address(unsigned long address);
extern void setup_boot_APIC_clock(void);
......@@ -183,6 +182,7 @@ static inline void disable_local_APIC(void) { }
# define setup_boot_APIC_clock x86_init_noop
# define setup_secondary_APIC_clock x86_init_noop
static inline void lapic_update_tsc_freq(void) { }
static inline void init_bsp_APIC(void) { }
static inline void apic_intr_mode_init(void) { }
static inline void lapic_assign_system_vectors(void) { }
static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { }
......@@ -304,12 +304,6 @@ struct apic {
u32 irq_delivery_mode;
u32 irq_dest_mode;
/* Functions and data related to vector allocation */
void (*vector_allocation_domain)(int cpu, struct cpumask *retmask,
const struct cpumask *mask);
int (*cpu_mask_to_apicid)(const struct cpumask *cpumask,
struct irq_data *irqdata,
unsigned int *apicid);
u32 (*calc_dest_apicid)(unsigned int cpu);
/* ICR related functions */
......@@ -499,17 +493,7 @@ extern void default_setup_apic_routing(void);
extern u32 apic_default_calc_apicid(unsigned int cpu);
extern u32 apic_flat_calc_apicid(unsigned int cpu);
extern int flat_cpu_mask_to_apicid(const struct cpumask *cpumask,
struct irq_data *irqdata,
unsigned int *apicid);
extern int default_cpu_mask_to_apicid(const struct cpumask *cpumask,
struct irq_data *irqdata,
unsigned int *apicid);
extern bool default_check_apicid_used(physid_mask_t *map, int apicid);
extern void flat_vector_allocation_domain(int cpu, struct cpumask *retmask,
const struct cpumask *mask);
extern void default_vector_allocation_domain(int cpu, struct cpumask *retmask,
const struct cpumask *mask);
extern void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap);
extern int default_cpu_present_to_apicid(int mps_cpu);
extern int default_check_phys_apicid_present(int phys_apicid);
......
......@@ -183,16 +183,17 @@ extern void disable_ioapic_support(void);
extern void __init io_apic_init_mappings(void);
extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
extern void native_disable_io_apic(void);
extern void native_restore_boot_irq_mode(void);
static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
{
return x86_io_apic_ops.read(apic, reg);
return x86_apic_ops.io_apic_read(apic, reg);
}
extern void setup_IO_APIC(void);
extern void enable_IO_APIC(void);
extern void disable_IO_APIC(void);
extern void clear_IO_APIC(void);
extern void restore_boot_irq_mode(void);
extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
extern void print_IO_APICs(void);
#else /* !CONFIG_X86_IO_APIC */
......@@ -228,10 +229,11 @@ static inline void mp_save_irq(struct mpc_intsrc *m) { }
static inline void disable_ioapic_support(void) { }
static inline void io_apic_init_mappings(void) { }
#define native_io_apic_read NULL
#define native_disable_io_apic NULL
#define native_restore_boot_irq_mode NULL
static inline void setup_IO_APIC(void) { }
static inline void enable_IO_APIC(void) { }
static inline void restore_boot_irq_mode(void) { }
#endif
......
......@@ -177,16 +177,6 @@ static inline int wbinvd_on_all_cpus(void)
extern unsigned disabled_cpus;
#ifdef CONFIG_X86_LOCAL_APIC
#ifndef CONFIG_X86_64
static inline int logical_smp_processor_id(void)
{
/* we don't want to mark this access volatile - bad code generation */
return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
}
#endif
extern int hard_smp_processor_id(void);
#else /* CONFIG_X86_LOCAL_APIC */
......
......@@ -274,16 +274,16 @@ struct x86_msi_ops {
void (*restore_msi_irqs)(struct pci_dev *dev);
};
struct x86_io_apic_ops {
unsigned int (*read) (unsigned int apic, unsigned int reg);
void (*disable)(void);
struct x86_apic_ops {
unsigned int (*io_apic_read) (unsigned int apic, unsigned int reg);
void (*restore)(void);
};
extern struct x86_init_ops x86_init;
extern struct x86_cpuinit_ops x86_cpuinit;
extern struct x86_platform_ops x86_platform;
extern struct x86_msi_ops x86_msi;
extern struct x86_io_apic_ops x86_io_apic_ops;
extern struct x86_apic_ops x86_apic_ops;
extern void x86_early_init_platform_quirks(void);
extern void x86_init_noop(void);
......
......@@ -1408,22 +1408,69 @@ static void lapic_setup_esr(void)
oldvalue, value);
}
static void apic_pending_intr_clear(void)
{
long long max_loops = cpu_khz ? cpu_khz : 1000000;
unsigned long long tsc = 0, ntsc;
unsigned int queued;
unsigned long value;
int i, j, acked = 0;
if (boot_cpu_has(X86_FEATURE_TSC))
tsc = rdtsc();
/*
* After a crash, we no longer service the interrupts and a pending
* interrupt from previous kernel might still have ISR bit set.
*
* Most probably by now CPU has serviced that pending interrupt and
* it might not have done the ack_APIC_irq() because it thought,
* interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
* does not clear the ISR bit and cpu thinks it has already serivced
* the interrupt. Hence a vector might get locked. It was noticed
* for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
*/
do {
queued = 0;
for (i = APIC_ISR_NR - 1; i >= 0; i--)
queued |= apic_read(APIC_IRR + i*0x10);
for (i = APIC_ISR_NR - 1; i >= 0; i--) {
value = apic_read(APIC_ISR + i*0x10);
for_each_set_bit(j, &value, 32) {
ack_APIC_irq();
acked++;
}
}
if (acked > 256) {
pr_err("LAPIC pending interrupts after %d EOI\n", acked);
break;
}
if (queued) {
if (boot_cpu_has(X86_FEATURE_TSC) && cpu_khz) {
ntsc = rdtsc();
max_loops = (cpu_khz << 10) - (ntsc - tsc);
} else {
max_loops--;
}
}
} while (queued && max_loops > 0);
WARN_ON(max_loops <= 0);
}
/**
* setup_local_APIC - setup the local APIC
*
* Used to setup local APIC while initializing BSP or bringing up APs.
* Always called with preemption disabled.
*/
void setup_local_APIC(void)
static void setup_local_APIC(void)
{
int cpu = smp_processor_id();
unsigned int value, queued;
int i, j, acked = 0;
unsigned long long tsc = 0, ntsc;
long long max_loops = cpu_khz ? cpu_khz : 1000000;
unsigned int value;
#ifdef CONFIG_X86_32
int logical_apicid, ldr_apicid;
#endif
if (boot_cpu_has(X86_FEATURE_TSC))
tsc = rdtsc();
if (disable_apic) {
disable_ioapic_support();
......@@ -1460,11 +1507,11 @@ void setup_local_APIC(void)
* initialized during get_smp_config(), make sure it matches the
* actual value.
*/
i = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
WARN_ON(i != BAD_APICID && i != logical_smp_processor_id());
logical_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
ldr_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
WARN_ON(logical_apicid != BAD_APICID && logical_apicid != ldr_apicid);
/* always use the value from LDR */
early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
logical_smp_processor_id();
early_per_cpu(x86_cpu_to_logical_apicid, cpu) = ldr_apicid;
#endif
/*
......@@ -1475,45 +1522,7 @@ void setup_local_APIC(void)
value &= ~APIC_TPRI_MASK;
apic_write(APIC_TASKPRI, value);
/*
* After a crash, we no longer service the interrupts and a pending
* interrupt from previous kernel might still have ISR bit set.
*
* Most probably by now CPU has serviced that pending interrupt and
* it might not have done the ack_APIC_irq() because it thought,
* interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
* does not clear the ISR bit and cpu thinks it has already serivced
* the interrupt. Hence a vector might get locked. It was noticed
* for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
*/
do {
queued = 0;
for (i = APIC_ISR_NR - 1; i >= 0; i--)
queued |= apic_read(APIC_IRR + i*0x10);
for (i = APIC_ISR_NR - 1; i >= 0; i--) {
value = apic_read(APIC_ISR + i*0x10);
for (j = 31; j >= 0; j--) {
if (value & (1<<j)) {
ack_APIC_irq();
acked++;
}
}
}
if (acked > 256) {
printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n",
acked);
break;
}
if (queued) {
if (boot_cpu_has(X86_FEATURE_TSC) && cpu_khz) {
ntsc = rdtsc();
max_loops = (cpu_khz << 10) - (ntsc - tsc);
} else
max_loops--;
}
} while (queued && max_loops > 0);
WARN_ON(max_loops <= 0);
apic_pending_intr_clear();
/*
* Now that we are all set up, enable the APIC
......@@ -1570,7 +1579,7 @@ void setup_local_APIC(void)
* TODO: set up through-local-APIC from through-I/O-APIC? --macro
*/
value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
if (!cpu && (pic_mode || !value)) {
if (!cpu && (pic_mode || !value || skip_ioapic_setup)) {
value = APIC_DM_EXTINT;
apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu);
} else {
......
......@@ -587,7 +587,7 @@ static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
mpc_ioapic_id(apic), pin);
}
static void clear_IO_APIC (void)
void clear_IO_APIC (void)
{
int apic, pin;
......@@ -1410,7 +1410,7 @@ void __init enable_IO_APIC(void)
clear_IO_APIC();
}
void native_disable_io_apic(void)
void native_restore_boot_irq_mode(void)
{
/*
* If the i8259 is routed through an IOAPIC
......@@ -1438,20 +1438,12 @@ void native_disable_io_apic(void)
disconnect_bsp_APIC(ioapic_i8259.pin != -1);
}
/*
* Not an __init, needed by the reboot code
*/
void disable_IO_APIC(void)
void restore_boot_irq_mode(void)
{
/*
* Clear the IO-APIC before rebooting:
*/
clear_IO_APIC();
if (!nr_legacy_irqs())
return;
x86_io_apic_ops.disable();
x86_apic_ops.restore();
}
#ifdef CONFIG_X86_32
......
......@@ -14,7 +14,7 @@ int x2apic_phys;
static struct apic apic_x2apic_phys;
static int set_x2apic_phys_mode(char *arg)
static int __init set_x2apic_phys_mode(char *arg)
{
x2apic_phys = 1;
return 0;
......
......@@ -199,9 +199,10 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
#ifdef CONFIG_X86_IO_APIC
/* Prevent crash_kexec() from deadlocking on ioapic_lock. */
ioapic_zap_locks();
disable_IO_APIC();
clear_IO_APIC();
#endif
lapic_shutdown();
restore_boot_irq_mode();
#ifdef CONFIG_HPET_TIMER
hpet_disable();
#endif
......
......@@ -61,9 +61,14 @@ void __init init_ISA_irqs(void)
struct irq_chip *chip = legacy_pic->chip;
int i;
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
/*
* Try to set up the through-local-APIC virtual wire mode earlier.
*
* On some 32-bit UP machines, whose APIC has been disabled by BIOS
* and then got re-enabled by "lapic", it hangs at boot time without this.
*/
init_bsp_APIC();
#endif
legacy_pic->init(0);
for (i = 0; i < nr_legacy_irqs(); i++)
......
......@@ -195,11 +195,11 @@ void machine_kexec(struct kimage *image)
/*
* We need to put APICs in legacy mode so that we can
* get timer interrupts in second kernel. kexec/kdump
* paths already have calls to disable_IO_APIC() in
* one form or other. kexec jump path also need
* one.
* paths already have calls to restore_boot_irq_mode()
* in one form or other. kexec jump path also need one.
*/
disable_IO_APIC();
clear_IO_APIC();
restore_boot_irq_mode();
#endif
}
......
......@@ -293,11 +293,11 @@ void machine_kexec(struct kimage *image)
/*
* We need to put APICs in legacy mode so that we can
* get timer interrupts in second kernel. kexec/kdump
* paths already have calls to disable_IO_APIC() in
* one form or other. kexec jump path also need
* one.
* paths already have calls to restore_boot_irq_mode()
* in one form or other. kexec jump path also need one.
*/
disable_IO_APIC();
clear_IO_APIC();
restore_boot_irq_mode();
#endif
}
......
......@@ -666,7 +666,7 @@ void native_machine_shutdown(void)
* Even without the erratum, it still makes sense to quiet IO APIC
* before disabling Local APIC.
*/
disable_IO_APIC();
clear_IO_APIC();
#endif
#ifdef CONFIG_SMP
......@@ -680,6 +680,7 @@ void native_machine_shutdown(void)
#endif
lapic_shutdown();
restore_boot_irq_mode();
#ifdef CONFIG_HPET_TIMER
hpet_disable();
......
......@@ -146,7 +146,7 @@ void arch_restore_msi_irqs(struct pci_dev *dev)
}
#endif
struct x86_io_apic_ops x86_io_apic_ops __ro_after_init = {
.read = native_io_apic_read,
.disable = native_disable_io_apic,
struct x86_apic_ops x86_apic_ops __ro_after_init = {
.io_apic_read = native_io_apic_read,
.restore = native_restore_boot_irq_mode,
};
......@@ -215,7 +215,7 @@ static void __init xen_apic_check(void)
}
void __init xen_init_apic(void)
{
x86_io_apic_ops.read = xen_io_apic_read;
x86_apic_ops.io_apic_read = xen_io_apic_read;
/* On PV guests the APIC CPUID bit is disabled so none of the
* routines end up executing. */
if (!xen_initial_domain())
......
......@@ -27,7 +27,7 @@ int disable_irq_post = 0;
static int disable_irq_remap;
static struct irq_remap_ops *remap_ops;
static void irq_remapping_disable_io_apic(void)
static void irq_remapping_restore_boot_irq_mode(void)
{
/*
* With interrupt-remapping, for now we will use virtual wire A
......@@ -42,7 +42,7 @@ static void irq_remapping_disable_io_apic(void)
static void __init irq_remapping_modify_x86_ops(void)
{
x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
x86_apic_ops.restore = irq_remapping_restore_boot_irq_mode;
}
static __init int setup_nointremap(char *str)
......
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