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ACPI,PCI,IRQ: reduce resource requirements

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Code has been redesigned to calculate penalty requirements on the fly. This
significantly simplifies the implementation and removes some of the init
calls from x86 architecture.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sinan Kaya 2016-04-17 13:36:53 -04:00 committed by Rafael J. Wysocki
parent 04974df804
commit 103544d869
1 changed files with 68 additions and 29 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

97
drivers/acpi/pci_link.c
View file

@ -36,6 +36,7 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/irq.h>
#include "internal.h"
@ -440,7 +441,6 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
#define ACPI_MAX_IRQS 256
#define ACPI_MAX_ISA_IRQ 16
#define PIRQ_PENALTY_PCI_AVAILABLE (0)
#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
#define PIRQ_PENALTY_PCI_USING (16*16*16)
#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
@ -457,9 +457,9 @@ static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
0, /* IRQ9 PCI, often acpi */
0, /* IRQ10 PCI */
0, /* IRQ11 PCI */
PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
@ -467,6 +467,60 @@ static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
/* >IRQ15 */
};
static int acpi_irq_pci_sharing_penalty(int irq)
{
struct acpi_pci_link *link;
int penalty = 0;
list_for_each_entry(link, &acpi_link_list, list) {
/*
* If a link is active, penalize its IRQ heavily
* so we try to choose a different IRQ.
*/
if (link->irq.active && link->irq.active == irq)
penalty += PIRQ_PENALTY_PCI_USING;
else {
int i;
/*
* If a link is inactive, penalize the IRQs it
* might use, but not as severely.
*/
for (i = 0; i < link->irq.possible_count; i++)
if (link->irq.possible[i] == irq)
penalty += PIRQ_PENALTY_PCI_POSSIBLE /
link->irq.possible_count;
}
}
return penalty;
}
static int acpi_irq_get_penalty(int irq)
{
int penalty = 0;
if (irq < ACPI_MAX_ISA_IRQ)
penalty += acpi_irq_penalty[irq];
/*
* Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict
* with PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be
* use for PCI IRQs.
*/
if (irq == acpi_gbl_FADT.sci_interrupt) {
u32 type = irq_get_trigger_type(irq) & IRQ_TYPE_SENSE_MASK;
if (type != IRQ_TYPE_LEVEL_LOW)
penalty += PIRQ_PENALTY_ISA_ALWAYS;
else
penalty += PIRQ_PENALTY_PCI_USING;
}
penalty += acpi_irq_pci_sharing_penalty(irq);
return penalty;
}
int __init acpi_irq_penalty_init(void)
{
struct acpi_pci_link *link;
@ -547,12 +601,12 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
* the use of IRQs 9, 10, 11, and >15.
*/
for (i = (link->irq.possible_count - 1); i >= 0; i--) {
if (acpi_irq_penalty[irq] >
acpi_irq_penalty[link->irq.possible[i]])
if (acpi_irq_get_penalty(irq) >
acpi_irq_get_penalty(link->irq.possible[i]))
irq = link->irq.possible[i];
}
}
if (acpi_irq_penalty[irq] >= PIRQ_PENALTY_ISA_ALWAYS) {
if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) {
printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
"Try pci=noacpi or acpi=off\n",
acpi_device_name(link->device),
@ -568,7 +622,6 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
acpi_device_bid(link->device));
return -ENODEV;
} else {
acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
acpi_device_name(link->device),
acpi_device_bid(link->device), link->irq.active);
@ -800,9 +853,10 @@ static int __init acpi_irq_penalty_update(char *str, int used)
continue;
if (used)
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
acpi_irq_penalty[irq] = acpi_irq_get_penalty(irq) +
PIRQ_PENALTY_ISA_USED;
else
acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
acpi_irq_penalty[irq] = 0;
if (retval != 2) /* no next number */
break;
@ -819,34 +873,19 @@ static int __init acpi_irq_penalty_update(char *str, int used)
*/
void acpi_penalize_isa_irq(int irq, int active)
{
if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
if (active)
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
else
acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
}
if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty))
acpi_irq_penalty[irq] = acpi_irq_get_penalty(irq) +
active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING;
}
bool acpi_isa_irq_available(int irq)
{
return irq >= 0 && (irq >= ARRAY_SIZE(acpi_irq_penalty) ||
acpi_irq_penalty[irq] < PIRQ_PENALTY_ISA_ALWAYS);
acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
}
/*
* Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict with
* PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be use for
* PCI IRQs.
*/
void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
{
if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
if (trigger != ACPI_MADT_TRIGGER_LEVEL ||
polarity != ACPI_MADT_POLARITY_ACTIVE_LOW)
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_ALWAYS;
else
acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
}
}
/*