MIPS: Octeon: Replace rwlocks in irq_chip handlers with raw_spinlocks.
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>
diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index bc985b7..c424cd1 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -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)
{
@@ -137,19 +137,12 @@
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)
@@ -158,7 +151,7 @@
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));
@@ -170,7 +163,7 @@
* 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);
}
/*
@@ -256,7 +249,7 @@
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 =
@@ -272,7 +265,7 @@
* 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;
}
@@ -377,19 +370,12 @@
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)
@@ -398,7 +384,7 @@
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));
@@ -410,7 +396,7 @@
* 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);
}
/*
@@ -474,7 +460,7 @@
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 =
@@ -491,7 +477,7 @@
* 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;
}