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x86/vector: Untangle internal state from irq_cfg 

The vector management state is not required to live in irq_cfg. irq_cfg is
only relevant for the depending irq domains (IOAPIC, DMAR, MSI ...).

The seperation of the vector management status allows to direct a shut down
interrupt to a special shutdown vector w/o confusing the internal state of
the vector management.

Preparatory change for the rework of managed interrupts and the global
vector reservation scheme.

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/20170913213155.683712356@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-09-13 23:29:45 +02:00
parent ba801640b1
commit ba224feac8
2 changed files with 49 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -124,8 +124,7 @@ struct irq_alloc_info {
struct irq_cfg {
unsigned int dest_apicid;
u8 vector;
u8 old_vector;
unsigned int vector;
};
extern struct irq_cfg *irq_cfg(unsigned int irq);

88
arch/x86/kernel/apic/vector.c
View File

@ -25,7 +25,9 @@
#include <asm/trace/irq_vectors.h>
struct apic_chip_data {
struct irq_cfg cfg;
struct irq_cfg hw_irq_cfg;
unsigned int vector;
unsigned int prev_vector;
unsigned int cpu;
unsigned int prev_cpu;
unsigned int irq;
@ -86,7 +88,7 @@ struct irq_cfg *irqd_cfg(struct irq_data *irqd)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
return apicd ? &apicd->cfg : NULL;
return apicd ? &apicd->hw_irq_cfg : NULL;
}
EXPORT_SYMBOL_GPL(irqd_cfg);
@ -110,16 +112,18 @@ static void free_apic_chip_data(struct apic_chip_data *apicd)
kfree(apicd);
}
static void apic_update_irq_cfg(struct irq_data *irqd)
static void apic_update_irq_cfg(struct irq_data *irqd, unsigned int vector,
unsigned int cpu)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
lockdep_assert_held(&vector_lock);
apicd->cfg.dest_apicid = apic->calc_dest_apicid(apicd->cpu);
irq_data_update_effective_affinity(irqd, cpumask_of(apicd->cpu));
trace_vector_config(irqd->irq, apicd->cfg.vector, apicd->cpu,
apicd->cfg.dest_apicid);
apicd->hw_irq_cfg.vector = vector;
apicd->hw_irq_cfg.dest_apicid = apic->calc_dest_apicid(cpu);
irq_data_update_effective_affinity(irqd, cpumask_of(cpu));
trace_vector_config(irqd->irq, vector, cpu,
apicd->hw_irq_cfg.dest_apicid);
}
static void apic_update_vector(struct irq_data *irqd, unsigned int newvec,
@ -130,19 +134,19 @@ static void apic_update_vector(struct irq_data *irqd, unsigned int newvec,
lockdep_assert_held(&vector_lock);
trace_vector_update(irqd->irq, newvec, newcpu, apicd->cfg.vector,
trace_vector_update(irqd->irq, newvec, newcpu, apicd->vector,
apicd->cpu);
/* Setup the vector move, if required */
if (apicd->cfg.vector && cpu_online(apicd->cpu)) {
if (apicd->vector && cpu_online(apicd->cpu)) {
apicd->move_in_progress = true;
apicd->cfg.old_vector = apicd->cfg.vector;
apicd->prev_vector = apicd->vector;
apicd->prev_cpu = apicd->cpu;
} else {
apicd->cfg.old_vector = 0;
apicd->prev_vector = 0;
}
apicd->cfg.vector = newvec;
apicd->vector = newvec;
apicd->cpu = newcpu;
BUG_ON(!IS_ERR_OR_NULL(per_cpu(vector_irq, newcpu)[newvec]));
per_cpu(vector_irq, newcpu)[newvec] = desc;
@ -151,8 +155,10 @@ static void apic_update_vector(struct irq_data *irqd, unsigned int newvec,
static int allocate_vector(struct irq_data *irqd, const struct cpumask *dest)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
int vector = apicd->cfg.vector;
unsigned int cpu = apicd->cpu;
int vector = apicd->vector;
lockdep_assert_held(&vector_lock);
/*
* If the current target CPU is online and in the new requested
@ -172,12 +178,13 @@ static int allocate_vector(struct irq_data *irqd, const struct cpumask *dest)
static int assign_vector_locked(struct irq_data *irqd,
const struct cpumask *dest)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
int vector = allocate_vector(irqd, dest);
if (vector < 0)
return vector;
apic_update_irq_cfg(irqd);
apic_update_irq_cfg(irqd, apicd->vector, apicd->cpu);
return 0;
}
@ -207,27 +214,28 @@ static int assign_irq_vector_policy(struct irq_data *irqd,
static void clear_irq_vector(struct irq_data *irqd)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
unsigned int vector = apicd->cfg.vector;
unsigned int vector = apicd->vector;
lockdep_assert_held(&vector_lock);
if (!vector)
return;
trace_vector_clear(irqd->irq, vector, apicd->cpu, apicd->cfg.old_vector,
trace_vector_clear(irqd->irq, vector, apicd->cpu, apicd->prev_vector,
apicd->prev_cpu);
per_cpu(vector_irq, apicd->cpu)[vector] = VECTOR_UNUSED;
irq_matrix_free(vector_matrix, apicd->cpu, vector, false);
apicd->cfg.vector = 0;
apicd->vector = 0;
/* Clean up move in progress */
vector = apicd->cfg.old_vector;
vector = apicd->prev_vector;
if (!vector)
return;
per_cpu(vector_irq, apicd->prev_cpu)[vector] = VECTOR_UNUSED;
irq_matrix_free(vector_matrix, apicd->prev_cpu, vector, false);
apicd->cfg.old_vector = 0;
apicd->prev_vector = 0;
apicd->move_in_progress = 0;
hlist_del_init(&apicd->clist);
}
@ -293,11 +301,11 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
* config.
*/
if (info->flags & X86_IRQ_ALLOC_LEGACY) {
apicd->cfg.vector = ISA_IRQ_VECTOR(virq + i);
apicd->vector = ISA_IRQ_VECTOR(virq + i);
apicd->cpu = 0;
trace_vector_setup(virq + i, true, 0);
raw_spin_lock_irqsave(&vector_lock, flags);
apic_update_irq_cfg(irqd);
apic_update_irq_cfg(irqd, apicd->vector, apicd->cpu);
raw_spin_unlock_irqrestore(&vector_lock, flags);
continue;
}
@ -319,7 +327,7 @@ error:
void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d,
struct irq_data *irqd, int ind)
{
unsigned int cpu, vec, prev_cpu, prev_vec;
unsigned int cpu, vector, prev_cpu, prev_vector;
struct apic_chip_data *apicd;
unsigned long flags;
int irq;
@ -344,14 +352,14 @@ void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d,
raw_spin_lock_irqsave(&vector_lock, flags);
cpu = apicd->cpu;
vec = apicd->cfg.vector;
vector = apicd->vector;
prev_cpu = apicd->prev_cpu;
prev_vec = apicd->cfg.old_vector;
prev_vector = apicd->prev_vector;
raw_spin_unlock_irqrestore(&vector_lock, flags);
seq_printf(m, "%*sVector: %5u\n", ind, "", vec);
seq_printf(m, "%*sVector: %5u\n", ind, "", vector);
seq_printf(m, "%*sTarget: %5u\n", ind, "", cpu);
if (prev_vec) {
seq_printf(m, "%*sPrevious vector: %5u\n", ind, "", prev_vec);
if (prev_vector) {
seq_printf(m, "%*sPrevious vector: %5u\n", ind, "", prev_vector);
seq_printf(m, "%*sPrevious target: %5u\n", ind, "", prev_cpu);
}
}
@ -461,10 +469,10 @@ static void vector_update_shutdown_irqs(void)
struct irq_data *irqd = irq_desc_get_irq_data(desc);
struct apic_chip_data *ad = apic_chip_data(irqd);
if (!ad || !ad->cfg.vector || ad->cpu != smp_processor_id())
if (!ad || !ad->vector || ad->cpu != smp_processor_id())
continue;
this_cpu_write(vector_irq[ad->cfg.vector], desc);
irq_matrix_assign(vector_matrix, ad->cfg.vector);
this_cpu_write(vector_irq[ad->vector], desc);
irq_matrix_assign(vector_matrix, ad->vector);
}
}
@ -543,7 +551,7 @@ static int apic_retrigger_irq(struct irq_data *irqd)
unsigned long flags;
raw_spin_lock_irqsave(&vector_lock, flags);
apic->send_IPI(apicd->cpu, apicd->cfg.vector);
apic->send_IPI(apicd->cpu, apicd->vector);
raw_spin_unlock_irqrestore(&vector_lock, flags);
return 1;
@ -567,14 +575,14 @@ static struct irq_chip lapic_controller = {
static void free_moved_vector(struct apic_chip_data *apicd)
{
unsigned int vector = apicd->cfg.old_vector;
unsigned int vector = apicd->prev_vector;
unsigned int cpu = apicd->prev_cpu;
trace_vector_free_moved(apicd->irq, vector, false);
irq_matrix_free(vector_matrix, cpu, vector, false);
__this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
hlist_del_init(&apicd->clist);
apicd->cfg.old_vector = 0;
apicd->prev_vector = 0;
apicd->move_in_progress = 0;
}
@ -589,7 +597,7 @@ asmlinkage __visible void __irq_entry smp_irq_move_cleanup_interrupt(void)
raw_spin_lock(&vector_lock);
hlist_for_each_entry_safe(apicd, tmp, clhead, clist) {
unsigned int irr, vector = apicd->cfg.old_vector;
unsigned int irr, vector = apicd->prev_vector;
/*
* Paranoia: Check if the vector that needs to be cleaned
@ -623,7 +631,7 @@ static void __send_cleanup_vector(struct apic_chip_data *apicd)
hlist_add_head(&apicd->clist, per_cpu_ptr(&cleanup_list, cpu));
apic->send_IPI(cpu, IRQ_MOVE_CLEANUP_VECTOR);
} else {
apicd->cfg.old_vector = 0;
apicd->prev_vector = 0;
}
raw_spin_unlock(&vector_lock);
}
@ -632,7 +640,7 @@ void send_cleanup_vector(struct irq_cfg *cfg)
{
struct apic_chip_data *apicd;
apicd = container_of(cfg, struct apic_chip_data, cfg);
apicd = container_of(cfg, struct apic_chip_data, hw_irq_cfg);
if (apicd->move_in_progress)
__send_cleanup_vector(apicd);
}
@ -641,11 +649,11 @@ static void __irq_complete_move(struct irq_cfg *cfg, unsigned vector)
{
struct apic_chip_data *apicd;
apicd = container_of(cfg, struct apic_chip_data, cfg);
apicd = container_of(cfg, struct apic_chip_data, hw_irq_cfg);
if (likely(!apicd->move_in_progress))
return;
if (vector == apicd->cfg.vector && apicd->cpu == smp_processor_id())
if (vector == apicd->vector && apicd->cpu == smp_processor_id())
__send_cleanup_vector(apicd);
}
@ -683,9 +691,9 @@ void irq_force_complete_move(struct irq_desc *desc)
goto unlock;
/*
* If old_vector is empty, no action required.
* If prev_vector is empty, no action required.
*/
vector = apicd->cfg.old_vector;
vector = apicd->prev_vector;
if (!vector)
goto unlock;