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x86/irq/vector: Initialize matrix allocator 

Initialize the matrix allocator and add the proper accounting points to the
code.

No functional change, just preparation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213155.108410660@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-09-13 23:29:38 +02:00
parent 9f9e3bb1cf
commit 0fa115da40
7 changed files with 65 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/Kconfig
View File

@ -92,6 +92,7 @@ config X86
select GENERIC_FIND_FIRST_BIT
select GENERIC_IOMAP
select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC
select GENERIC_IRQ_MIGRATION if SMP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW

6
arch/x86/include/asm/apic.h
View File

@ -169,6 +169,10 @@ static inline int apic_is_clustered_box(void)
#endif
extern int setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask);
extern void lapic_assign_system_vectors(void);
extern void lapic_assign_legacy_vector(unsigned int isairq, bool replace);
extern void lapic_online(void);
extern void lapic_offline(void);
#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }
@ -179,6 +183,8 @@ static inline void disable_local_APIC(void) { }
# define setup_secondary_APIC_clock x86_init_noop
static inline void lapic_update_tsc_freq(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) { }
#endif /* !CONFIG_X86_LOCAL_APIC */
#ifdef CONFIG_X86_X2APIC

3
arch/x86/include/asm/hw_irq.h
View File

@ -15,6 +15,8 @@
#include <asm/irq_vectors.h>
#define IRQ_MATRIX_BITS NR_VECTORS
#ifndef __ASSEMBLY__
#include <linux/percpu.h>
@ -130,7 +132,6 @@ extern struct irq_cfg *irq_cfg(unsigned int irq);
extern struct irq_cfg *irqd_cfg(struct irq_data *irq_data);
extern void lock_vector_lock(void);
extern void unlock_vector_lock(void);
extern void setup_vector_irq(int cpu);
#ifdef CONFIG_SMP
extern void send_cleanup_vector(struct irq_cfg *);
extern void irq_complete_move(struct irq_cfg *cfg);

56
arch/x86/kernel/apic/vector.c
View File

@ -36,6 +36,7 @@ EXPORT_SYMBOL_GPL(x86_vector_domain);
static DEFINE_RAW_SPINLOCK(vector_lock);
static cpumask_var_t vector_cpumask, vector_searchmask, searched_cpumask;
static struct irq_chip lapic_controller;
static struct irq_matrix *vector_matrix;
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(struct hlist_head, cleanup_list);
#endif
@ -404,6 +405,36 @@ int __init arch_probe_nr_irqs(void)
return legacy_pic->probe();
}
void lapic_assign_legacy_vector(unsigned int irq, bool replace)
{
/*
* Use assign system here so it wont get accounted as allocated
* and moveable in the cpu hotplug check and it prevents managed
* irq reservation from touching it.
*/
irq_matrix_assign_system(vector_matrix, ISA_IRQ_VECTOR(irq), replace);
}
void __init lapic_assign_system_vectors(void)
{
unsigned int i, vector = 0;
for_each_set_bit_from(vector, system_vectors, NR_VECTORS)
irq_matrix_assign_system(vector_matrix, vector, false);
if (nr_legacy_irqs() > 1)
lapic_assign_legacy_vector(PIC_CASCADE_IR, false);
/* System vectors are reserved, online it */
irq_matrix_online(vector_matrix);
/* Mark the preallocated legacy interrupts */
for (i = 0; i < nr_legacy_irqs(); i++) {
if (i != PIC_CASCADE_IR)
irq_matrix_assign(vector_matrix, ISA_IRQ_VECTOR(i));
}
}
int __init arch_early_irq_init(void)
{
struct fwnode_handle *fn;
@ -423,6 +454,14 @@ int __init arch_early_irq_init(void)
BUG_ON(!alloc_cpumask_var(&vector_searchmask, GFP_KERNEL));
BUG_ON(!alloc_cpumask_var(&searched_cpumask, GFP_KERNEL));
/*
* Allocate the vector matrix allocator data structure and limit the
* search area.
*/
vector_matrix = irq_alloc_matrix(NR_VECTORS, FIRST_EXTERNAL_VECTOR,
FIRST_SYSTEM_VECTOR);
BUG_ON(!vector_matrix);
return arch_early_ioapic_init();
}
@ -454,14 +493,16 @@ static struct irq_desc *__setup_vector_irq(int vector)
return irq_to_desc(isairq);
}
/*
* Setup the vector to irq mappings. Must be called with vector_lock held.
*/
void setup_vector_irq(int cpu)
/* Online the local APIC infrastructure and initialize the vectors */
void lapic_online(void)
{
unsigned int vector;
lockdep_assert_held(&vector_lock);
/* Online the vector matrix array for this CPU */
irq_matrix_online(vector_matrix);
/*
* The interrupt affinity logic never targets interrupts to offline
* CPUs. The exception are the legacy PIC interrupts. In general
@ -482,6 +523,13 @@ void setup_vector_irq(int cpu)
vector_update_shutdown_irqs();
}
void lapic_offline(void)
{
lock_vector_lock();
irq_matrix_offline(vector_matrix);
unlock_vector_lock();
}
static int apic_retrigger_irq(struct irq_data *irqd)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);

1
arch/x86/kernel/i8259.c
View File

@ -113,6 +113,7 @@ static void make_8259A_irq(unsigned int irq)
io_apic_irqs &= ~(1<<irq);
irq_set_chip_and_handler(irq, &i8259A_chip, handle_level_irq);
enable_irq(irq);
lapic_assign_legacy_vector(irq, true);
}
/*

1
arch/x86/kernel/irqinit.c
View File

@ -90,6 +90,7 @@ void __init native_init_IRQ(void)
x86_init.irqs.pre_vector_init();
idt_setup_apic_and_irq_gates();
lapic_assign_system_vectors();
if (!acpi_ioapic && !of_ioapic && nr_legacy_irqs())
setup_irq(2, &irq2);

3
arch/x86/kernel/smpboot.c
View File

@ -260,7 +260,7 @@ static void notrace start_secondary(void *unused)
* from seeing a half valid vector space.
*/
lock_vector_lock();
setup_vector_irq(smp_processor_id());
lapic_online();
set_cpu_online(smp_processor_id(), true);
unlock_vector_lock();
cpu_set_state_online(smp_processor_id());
@ -1518,6 +1518,7 @@ void cpu_disable_common(void)
remove_cpu_from_maps(cpu);
unlock_vector_lock();
fixup_irqs();
lapic_offline();
}
int native_cpu_disable(void)