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path: root/drivers/acpi/pci_link.c
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Diffstat (limited to 'drivers/acpi/pci_link.c')
-rw-r--r--drivers/acpi/pci_link.c132
1 files changed, 96 insertions, 36 deletions
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 7c8408b946ca..fa2863567eed 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -4,6 +4,7 @@
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
@@ -67,12 +68,12 @@ static struct acpi_scan_handler pci_link_handler = {
* later even the link is disable. Instead, we just repick the active irq
*/
struct acpi_pci_link_irq {
- u8 active; /* Current IRQ */
+ u32 active; /* Current IRQ */
u8 triggering; /* All IRQs */
u8 polarity; /* All IRQs */
u8 resource_type;
u8 possible_count;
- u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
+ u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
u8 initialized:1;
u8 reserved:7;
};
@@ -437,7 +438,6 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
* enabled system.
*/
-#define ACPI_MAX_IRQS 256
#define ACPI_MAX_ISA_IRQ 16
#define PIRQ_PENALTY_PCI_AVAILABLE (0)
@@ -447,7 +447,7 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
-static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
+static int acpi_irq_isa_penalty[ACPI_MAX_ISA_IRQ] = {
PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
@@ -464,9 +464,68 @@ static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
- /* >IRQ15 */
};
+struct irq_penalty_info {
+ int irq;
+ int penalty;
+ struct list_head node;
+};
+
+static LIST_HEAD(acpi_irq_penalty_list);
+
+static int acpi_irq_get_penalty(int irq)
+{
+ struct irq_penalty_info *irq_info;
+
+ if (irq < ACPI_MAX_ISA_IRQ)
+ return acpi_irq_isa_penalty[irq];
+
+ list_for_each_entry(irq_info, &acpi_irq_penalty_list, node) {
+ if (irq_info->irq == irq)
+ return irq_info->penalty;
+ }
+
+ return 0;
+}
+
+static int acpi_irq_set_penalty(int irq, int new_penalty)
+{
+ struct irq_penalty_info *irq_info;
+
+ /* see if this is a ISA IRQ */
+ if (irq < ACPI_MAX_ISA_IRQ) {
+ acpi_irq_isa_penalty[irq] = new_penalty;
+ return 0;
+ }
+
+ /* next, try to locate from the dynamic list */
+ list_for_each_entry(irq_info, &acpi_irq_penalty_list, node) {
+ if (irq_info->irq == irq) {
+ irq_info->penalty = new_penalty;
+ return 0;
+ }
+ }
+
+ /* nope, let's allocate a slot for this IRQ */
+ irq_info = kzalloc(sizeof(*irq_info), GFP_KERNEL);
+ if (!irq_info)
+ return -ENOMEM;
+
+ irq_info->irq = irq;
+ irq_info->penalty = new_penalty;
+ list_add_tail(&irq_info->node, &acpi_irq_penalty_list);
+
+ return 0;
+}
+
+static void acpi_irq_add_penalty(int irq, int penalty)
+{
+ int curpen = acpi_irq_get_penalty(irq);
+
+ acpi_irq_set_penalty(irq, curpen + penalty);
+}
+
int __init acpi_irq_penalty_init(void)
{
struct acpi_pci_link *link;
@@ -487,15 +546,16 @@ int __init acpi_irq_penalty_init(void)
link->irq.possible_count;
for (i = 0; i < link->irq.possible_count; i++) {
- if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
- acpi_irq_penalty[link->irq.
- possible[i]] +=
- penalty;
+ if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) {
+ int irqpos = link->irq.possible[i];
+
+ acpi_irq_add_penalty(irqpos, penalty);
+ }
}
} else if (link->irq.active) {
- acpi_irq_penalty[link->irq.active] +=
- PIRQ_PENALTY_PCI_POSSIBLE;
+ acpi_irq_add_penalty(link->irq.active,
+ PIRQ_PENALTY_PCI_POSSIBLE);
}
}
@@ -547,12 +607,12 @@ 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 +628,8 @@ 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;
+ acpi_irq_add_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);
@@ -778,7 +839,7 @@ static void acpi_pci_link_remove(struct acpi_device *device)
}
/*
- * modify acpi_irq_penalty[] from cmdline
+ * modify penalty from cmdline
*/
static int __init acpi_irq_penalty_update(char *str, int used)
{
@@ -796,13 +857,10 @@ static int __init acpi_irq_penalty_update(char *str, int used)
if (irq < 0)
continue;
- if (irq >= ARRAY_SIZE(acpi_irq_penalty))
- continue;
-
if (used)
- acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
+ acpi_irq_add_penalty(irq, PIRQ_PENALTY_ISA_USED);
else
- acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
+ acpi_irq_set_penalty(irq, PIRQ_PENALTY_PCI_AVAILABLE);
if (retval != 2) /* no next number */
break;
@@ -819,18 +877,15 @@ 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)
+ acpi_irq_add_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);
+ return irq >= 0 &&
+ (acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
}
/*
@@ -840,13 +895,18 @@ bool acpi_isa_irq_available(int irq)
*/
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;
- }
+ int penalty;
+
+ if (irq < 0)
+ return;
+
+ if (trigger != ACPI_MADT_TRIGGER_LEVEL ||
+ polarity != ACPI_MADT_POLARITY_ACTIVE_LOW)
+ penalty = PIRQ_PENALTY_ISA_ALWAYS;
+ else
+ penalty = PIRQ_PENALTY_PCI_USING;
+
+ acpi_irq_add_penalty(irq, penalty);
}
/*
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.