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Subject[PATCH V3 1/4] acpi,pci,irq: reduce resource requirements
Date
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>
---
drivers/acpi/pci_link.c | 97 ++++++++++++++++++++++++++++++++++---------------
1 file changed, 68 insertions(+), 29 deletions(-)

diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index ededa90..cc0ba16 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -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;
- }
}

/*
--
1.8.2.1
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