summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/apic/io_apic.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/apic/io_apic.c')
-rw-r--r--arch/x86/kernel/apic/io_apic.c99
1 files changed, 45 insertions, 54 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index eb2789c..33f3563 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -89,6 +89,9 @@ int nr_ioapics;
/* IO APIC gsi routing info */
struct mp_ioapic_gsi mp_gsi_routing[MAX_IO_APICS];
+/* The last gsi number used */
+u32 gsi_end;
+
/* MP IRQ source entries */
struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
@@ -1013,10 +1016,9 @@ static inline int irq_trigger(int idx)
return MPBIOS_trigger(idx);
}
-int (*ioapic_renumber_irq)(int ioapic, int irq);
static int pin_2_irq(int idx, int apic, int pin)
{
- int irq, i;
+ int irq;
int bus = mp_irqs[idx].srcbus;
/*
@@ -1028,18 +1030,12 @@ static int pin_2_irq(int idx, int apic, int pin)
if (test_bit(bus, mp_bus_not_pci)) {
irq = mp_irqs[idx].srcbusirq;
} else {
- /*
- * PCI IRQs are mapped in order
- */
- i = irq = 0;
- while (i < apic)
- irq += nr_ioapic_registers[i++];
- irq += pin;
- /*
- * For MPS mode, so far only needed by ES7000 platform
- */
- if (ioapic_renumber_irq)
- irq = ioapic_renumber_irq(apic, irq);
+ u32 gsi = mp_gsi_routing[apic].gsi_base + pin;
+
+ if (gsi >= NR_IRQS_LEGACY)
+ irq = gsi;
+ else
+ irq = gsi_end + 1 + gsi;
}
#ifdef CONFIG_X86_32
@@ -1950,20 +1946,8 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
void __init enable_IO_APIC(void)
{
- union IO_APIC_reg_01 reg_01;
int i8259_apic, i8259_pin;
int apic;
- unsigned long flags;
-
- /*
- * The number of IO-APIC IRQ registers (== #pins):
- */
- for (apic = 0; apic < nr_ioapics; apic++) {
- raw_spin_lock_irqsave(&ioapic_lock, flags);
- reg_01.raw = io_apic_read(apic, 1);
- raw_spin_unlock_irqrestore(&ioapic_lock, flags);
- nr_ioapic_registers[apic] = reg_01.bits.entries+1;
- }
if (!legacy_pic->nr_legacy_irqs)
return;
@@ -3858,27 +3842,20 @@ int __init io_apic_get_redir_entries (int ioapic)
reg_01.raw = io_apic_read(ioapic, 1);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
- return reg_01.bits.entries;
+ /* The register returns the maximum index redir index
+ * supported, which is one less than the total number of redir
+ * entries.
+ */
+ return reg_01.bits.entries + 1;
}
void __init probe_nr_irqs_gsi(void)
{
- int nr = 0;
+ int nr;
- nr = acpi_probe_gsi();
- if (nr > nr_irqs_gsi) {
+ nr = gsi_end + 1 + NR_IRQS_LEGACY;
+ if (nr > nr_irqs_gsi)
nr_irqs_gsi = nr;
- } else {
- /* for acpi=off or acpi is not compiled in */
- int idx;
-
- nr = 0;
- for (idx = 0; idx < nr_ioapics; idx++)
- nr += io_apic_get_redir_entries(idx) + 1;
-
- if (nr > nr_irqs_gsi)
- nr_irqs_gsi = nr;
- }
printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
}
@@ -4085,22 +4062,27 @@ int __init io_apic_get_version(int ioapic)
return reg_01.bits.version;
}
-int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
+int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
{
- int i;
+ int ioapic, pin, idx;
if (skip_ioapic_setup)
return -1;
- for (i = 0; i < mp_irq_entries; i++)
- if (mp_irqs[i].irqtype == mp_INT &&
- mp_irqs[i].srcbusirq == bus_irq)
- break;
- if (i >= mp_irq_entries)
+ ioapic = mp_find_ioapic(gsi);
+ if (ioapic < 0)
return -1;
- *trigger = irq_trigger(i);
- *polarity = irq_polarity(i);
+ pin = mp_find_ioapic_pin(ioapic, gsi);
+ if (pin < 0)
+ return -1;
+
+ idx = find_irq_entry(ioapic, pin, mp_INT);
+ if (idx < 0)
+ return -1;
+
+ *trigger = irq_trigger(idx);
+ *polarity = irq_polarity(idx);
return 0;
}
@@ -4241,7 +4223,7 @@ void __init ioapic_insert_resources(void)
}
}
-int mp_find_ioapic(int gsi)
+int mp_find_ioapic(u32 gsi)
{
int i = 0;
@@ -4256,7 +4238,7 @@ int mp_find_ioapic(int gsi)
return -1;
}
-int mp_find_ioapic_pin(int ioapic, int gsi)
+int mp_find_ioapic_pin(int ioapic, u32 gsi)
{
if (WARN_ON(ioapic == -1))
return -1;
@@ -4284,6 +4266,7 @@ static int bad_ioapic(unsigned long address)
void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
{
int idx = 0;
+ int entries;
if (bad_ioapic(address))
return;
@@ -4302,9 +4285,17 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
*/
+ entries = io_apic_get_redir_entries(idx);
mp_gsi_routing[idx].gsi_base = gsi_base;
- mp_gsi_routing[idx].gsi_end = gsi_base +
- io_apic_get_redir_entries(idx);
+ mp_gsi_routing[idx].gsi_end = gsi_base + entries - 1;
+
+ /*
+ * The number of IO-APIC IRQ registers (== #pins):
+ */
+ nr_ioapic_registers[idx] = entries;
+
+ if (mp_gsi_routing[idx].gsi_end > gsi_end)
+ gsi_end = mp_gsi_routing[idx].gsi_end;
printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
"GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
OpenPOWER on IntegriCloud