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Subject[PATCH 05/26] x86: Convert ioapic_lock and vector_lock to raw_spinlocks
Date
Convert locks which cannot sleep in preempt-rt to raw_spinlocks.

See also: f32843e644be4d636101117c377a59e0646796e4

Signed-off-by: John Kacur <jkacur@redhat.com>
---
arch/x86/kernel/apic/io_apic.c | 102 ++++++++++++++++++++--------------------
1 files changed, 51 insertions(+), 51 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index de00c46..7719fa0 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -73,8 +73,8 @@
*/
int sis_apic_bug = -1;

-static DEFINE_SPINLOCK(ioapic_lock);
-static DEFINE_SPINLOCK(vector_lock);
+static DEFINE_RAW_SPINLOCK(ioapic_lock);
+static DEFINE_RAW_SPINLOCK(vector_lock);

/*
* # of IRQ routing registers
@@ -406,7 +406,7 @@ static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
struct irq_pin_list *entry;
unsigned long flags;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
for_each_irq_pin(entry, cfg->irq_2_pin) {
unsigned int reg;
int pin;
@@ -415,11 +415,11 @@ static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
reg = io_apic_read(entry->apic, 0x10 + pin*2);
/* Is the remote IRR bit set? */
if (reg & IO_APIC_REDIR_REMOTE_IRR) {
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return true;
}
}
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

return false;
}
@@ -433,10 +433,10 @@ static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
{
union entry_union eu;
unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return eu.entry;
}

@@ -459,9 +459,9 @@ __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
{
unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
__ioapic_write_entry(apic, pin, e);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}

/*
@@ -474,10 +474,10 @@ static void ioapic_mask_entry(int apic, int pin)
unsigned long flags;
union entry_union eu = { .entry.mask = 1 };

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x10 + 2*pin, eu.w1);
io_apic_write(apic, 0x11 + 2*pin, eu.w2);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}

/*
@@ -604,9 +604,9 @@ static void mask_IO_APIC_irq_desc(struct irq_desc *desc)

BUG_ON(!cfg);

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
__mask_IO_APIC_irq(cfg);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}

static void unmask_IO_APIC_irq_desc(struct irq_desc *desc)
@@ -614,9 +614,9 @@ static void unmask_IO_APIC_irq_desc(struct irq_desc *desc)
struct irq_cfg *cfg = desc->chip_data;
unsigned long flags;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
__unmask_IO_APIC_irq(cfg);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}

static void mask_IO_APIC_irq(unsigned int irq)
@@ -1140,12 +1140,12 @@ void lock_vector_lock(void)
/* Used to the online set of cpus does not change
* during assign_irq_vector.
*/
- spin_lock(&vector_lock);
+ raw_spin_lock(&vector_lock);
}

void unlock_vector_lock(void)
{
- spin_unlock(&vector_lock);
+ raw_spin_unlock(&vector_lock);
}

static int
@@ -1232,9 +1232,9 @@ int assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
int err;
unsigned long flags;

- spin_lock_irqsave(&vector_lock, flags);
+ raw_spin_lock_irqsave(&vector_lock, flags);
err = __assign_irq_vector(irq, cfg, mask);
- spin_unlock_irqrestore(&vector_lock, flags);
+ raw_spin_unlock_irqrestore(&vector_lock, flags);
return err;
}

@@ -1601,14 +1601,14 @@ __apicdebuginit(void) print_IO_APIC(void)

for (apic = 0; apic < nr_ioapics; apic++) {

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic, 0);
reg_01.raw = io_apic_read(apic, 1);
if (reg_01.bits.version >= 0x10)
reg_02.raw = io_apic_read(apic, 2);
if (reg_01.bits.version >= 0x20)
reg_03.raw = io_apic_read(apic, 3);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

printk("\n");
printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].apicid);
@@ -1903,9 +1903,9 @@ void __init enable_IO_APIC(void)
* The number of IO-APIC IRQ registers (== #pins):
*/
for (apic = 0; apic < nr_ioapics; apic++) {
- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(apic, 1);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
nr_ioapic_registers[apic] = reg_01.bits.entries+1;
}

@@ -2045,9 +2045,9 @@ void __init setup_ioapic_ids_from_mpc(void)
for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {

/* Read the register 0 value */
- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic_id, 0);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

old_id = mp_ioapics[apic_id].apicid;

@@ -2106,16 +2106,16 @@ void __init setup_ioapic_ids_from_mpc(void)
mp_ioapics[apic_id].apicid);

reg_00.bits.ID = mp_ioapics[apic_id].apicid;
- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic_id, 0, reg_00.raw);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

/*
* Sanity check
*/
- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic_id, 0);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
if (reg_00.bits.ID != mp_ioapics[apic_id].apicid)
printk("could not set ID!\n");
else
@@ -2198,7 +2198,7 @@ static unsigned int startup_ioapic_irq(unsigned int irq)
unsigned long flags;
struct irq_cfg *cfg;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
if (irq < nr_legacy_irqs) {
disable_8259A_irq(irq);
if (i8259A_irq_pending(irq))
@@ -2206,7 +2206,7 @@ static unsigned int startup_ioapic_irq(unsigned int irq)
}
cfg = irq_cfg(irq);
__unmask_IO_APIC_irq(cfg);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

return was_pending;
}
@@ -2217,9 +2217,9 @@ static int ioapic_retrigger_irq(unsigned int irq)
struct irq_cfg *cfg = irq_cfg(irq);
unsigned long flags;

- spin_lock_irqsave(&vector_lock, flags);
+ raw_spin_lock_irqsave(&vector_lock, flags);
apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
- spin_unlock_irqrestore(&vector_lock, flags);
+ raw_spin_unlock_irqrestore(&vector_lock, flags);

return 1;
}
@@ -2312,14 +2312,14 @@ set_ioapic_affinity_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
irq = desc->irq;
cfg = desc->chip_data;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
ret = set_desc_affinity(desc, mask, &dest);
if (!ret) {
/* Only the high 8 bits are valid. */
dest = SET_APIC_LOGICAL_ID(dest);
__target_IO_APIC_irq(irq, dest, cfg);
}
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

return ret;
}
@@ -2547,9 +2547,9 @@ static void eoi_ioapic_irq(struct irq_desc *desc)
irq = desc->irq;
cfg = desc->chip_data;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
__eoi_ioapic_irq(irq, cfg);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}

static void ack_apic_level(unsigned int irq)
@@ -3131,13 +3131,13 @@ static int ioapic_resume(struct sys_device *dev)
data = container_of(dev, struct sysfs_ioapic_data, dev);
entry = data->entry;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(dev->id, 0);
if (reg_00.bits.ID != mp_ioapics[dev->id].apicid) {
reg_00.bits.ID = mp_ioapics[dev->id].apicid;
io_apic_write(dev->id, 0, reg_00.raw);
}
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
ioapic_write_entry(dev->id, i, entry[i]);

@@ -3200,7 +3200,7 @@ unsigned int create_irq_nr(unsigned int irq_want, int node)
if (irq_want < nr_irqs_gsi)
irq_want = nr_irqs_gsi;

- spin_lock_irqsave(&vector_lock, flags);
+ raw_spin_lock_irqsave(&vector_lock, flags);
for (new = irq_want; new < nr_irqs; new++) {
desc_new = irq_to_desc_alloc_node(new, node);
if (!desc_new) {
@@ -3219,7 +3219,7 @@ unsigned int create_irq_nr(unsigned int irq_want, int node)
irq = new;
break;
}
- spin_unlock_irqrestore(&vector_lock, flags);
+ raw_spin_unlock_irqrestore(&vector_lock, flags);

if (irq > 0) {
dynamic_irq_init(irq);
@@ -3259,9 +3259,9 @@ void destroy_irq(unsigned int irq)
desc->chip_data = cfg;

free_irte(irq);
- spin_lock_irqsave(&vector_lock, flags);
+ raw_spin_lock_irqsave(&vector_lock, flags);
__clear_irq_vector(irq, cfg);
- spin_unlock_irqrestore(&vector_lock, flags);
+ raw_spin_unlock_irqrestore(&vector_lock, flags);
}

/*
@@ -3798,9 +3798,9 @@ int __init io_apic_get_redir_entries (int ioapic)
union IO_APIC_reg_01 reg_01;
unsigned long flags;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(ioapic, 1);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

return reg_01.bits.entries;
}
@@ -3962,9 +3962,9 @@ int __init io_apic_get_unique_id(int ioapic, int apic_id)
if (physids_empty(apic_id_map))
apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic, 0);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

if (apic_id >= get_physical_broadcast()) {
printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
@@ -3998,10 +3998,10 @@ int __init io_apic_get_unique_id(int ioapic, int apic_id)
if (reg_00.bits.ID != apic_id) {
reg_00.bits.ID = apic_id;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic, 0, reg_00.raw);
reg_00.raw = io_apic_read(ioapic, 0);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

/* Sanity check */
if (reg_00.bits.ID != apic_id) {
@@ -4022,9 +4022,9 @@ int __init io_apic_get_version(int ioapic)
union IO_APIC_reg_01 reg_01;
unsigned long flags;

- spin_lock_irqsave(&ioapic_lock, flags);
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(ioapic, 1);
- spin_unlock_irqrestore(&ioapic_lock, flags);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);

return reg_01.bits.version;
}
--
1.6.5.2


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