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MIPS: Octeon: Replace rwlocks in irq_chip handlers with raw_spinlocks.
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Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/972/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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David Daney authored and Ralf Baechle committed Feb 27, 2010
1 parent 4837a66 commit 3996142
Showing 1 changed file with 14 additions and 28 deletions.
42 changes: 14 additions & 28 deletions arch/mips/cavium-octeon/octeon-irq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,8 @@
#include <asm/octeon/cvmx-pexp-defs.h>
#include <asm/octeon/cvmx-npi-defs.h>

DEFINE_RWLOCK(octeon_irq_ciu0_rwlock);
DEFINE_RWLOCK(octeon_irq_ciu1_rwlock);
static DEFINE_RAW_SPINLOCK(octeon_irq_ciu0_lock);
static DEFINE_RAW_SPINLOCK(octeon_irq_ciu1_lock);

static int octeon_coreid_for_cpu(int cpu)
{
Expand Down Expand Up @@ -137,19 +137,12 @@ static void octeon_irq_ciu0_enable(unsigned int irq)
uint64_t en0;
int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */

/*
* A read lock is used here to make sure only one core is ever
* updating the CIU enable bits at a time. During an enable
* the cores don't interfere with each other. During a disable
* the write lock stops any enables that might cause a
* problem.
*/
read_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
en0 |= 1ull << bit;
cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
read_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
}

static void octeon_irq_ciu0_disable(unsigned int irq)
Expand All @@ -158,7 +151,7 @@ static void octeon_irq_ciu0_disable(unsigned int irq)
unsigned long flags;
uint64_t en0;
int cpu;
write_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
Expand All @@ -170,7 +163,7 @@ static void octeon_irq_ciu0_disable(unsigned int irq)
* of them are done.
*/
cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
write_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);
}

/*
Expand Down Expand Up @@ -256,7 +249,7 @@ static int octeon_irq_ciu0_set_affinity(unsigned int irq, const struct cpumask *
unsigned long flags;
int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */

write_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
uint64_t en0 =
Expand All @@ -272,7 +265,7 @@ static int octeon_irq_ciu0_set_affinity(unsigned int irq, const struct cpumask *
* of them are done.
*/
cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
write_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags);

return 0;
}
Expand Down Expand Up @@ -377,19 +370,12 @@ static void octeon_irq_ciu1_enable(unsigned int irq)
uint64_t en1;
int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */

/*
* A read lock is used here to make sure only one core is ever
* updating the CIU enable bits at a time. During an enable
* the cores don't interfere with each other. During a disable
* the write lock stops any enables that might cause a
* problem.
*/
read_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
en1 |= 1ull << bit;
cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
read_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}

static void octeon_irq_ciu1_disable(unsigned int irq)
Expand All @@ -398,7 +384,7 @@ static void octeon_irq_ciu1_disable(unsigned int irq)
unsigned long flags;
uint64_t en1;
int cpu;
write_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
Expand All @@ -410,7 +396,7 @@ static void octeon_irq_ciu1_disable(unsigned int irq)
* of them are done.
*/
cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
write_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);
}

/*
Expand Down Expand Up @@ -474,7 +460,7 @@ static int octeon_irq_ciu1_set_affinity(unsigned int irq,
unsigned long flags;
int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */

write_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags);
for_each_online_cpu(cpu) {
int coreid = octeon_coreid_for_cpu(cpu);
uint64_t en1 =
Expand All @@ -491,7 +477,7 @@ static int octeon_irq_ciu1_set_affinity(unsigned int irq,
* of them are done.
*/
cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
write_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags);

return 0;
}
Expand Down

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