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authorRalf Baechle <ralf@linux-mips.org>2005-12-09 12:29:38 +0000
committer <ralf@denk.linux-mips.net>2006-01-10 13:39:07 +0000
commitba339c03e2e8ede8ccd37ed6c4e564e3b1545495 (patch)
tree1a7bbfd15a9c46d5300d2d5a1890d748b81dbce2
parent0401572a9b9b2f368176b6e53f53004fd048a566 (diff)
downloadop-kernel-dev-ba339c03e2e8ede8ccd37ed6c4e564e3b1545495.zip
op-kernel-dev-ba339c03e2e8ede8ccd37ed6c4e564e3b1545495.tar.gz
MIPS: Oprofile: Fixup the loose ends in the plumbing.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/kernel/time.c26
-rw-r--r--arch/mips/mips-boards/generic/time.c20
-rw-r--r--arch/mips/oprofile/op_impl.h4
-rw-r--r--arch/mips/oprofile/op_model_mipsxx.c6
4 files changed, 49 insertions, 7 deletions
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 07e125c..7050b4f 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -507,14 +507,38 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
return IRQ_HANDLED;
}
+int null_perf_irq(struct pt_regs *regs)
+{
+ return 0;
+}
+
+int (*perf_irq)(struct pt_regs *regs) = null_perf_irq;
+
+EXPORT_SYMBOL(null_perf_irq);
+EXPORT_SYMBOL(perf_irq);
+
asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs)
{
+ int r2 = cpu_has_mips_r2;
+
irq_enter();
kstat_this_cpu.irqs[irq]++;
+ /*
+ * Suckage alert:
+ * Before R2 of the architecture there was no way to see if a
+ * performance counter interrupt was pending, so we have to run the
+ * performance counter interrupt handler anyway.
+ */
+ if (!r2 || (read_c0_cause() & (1 << 26)))
+ if (perf_irq(regs))
+ goto out;
+
/* we keep interrupt disabled all the time */
- timer_interrupt(irq, NULL, regs);
+ if (!r2 || (read_c0_cause() & (1 << 30)))
+ timer_interrupt(irq, NULL, regs);
+out:
irq_exit();
}
diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c
index 2830f65..93f3bf2 100644
--- a/arch/mips/mips-boards/generic/time.c
+++ b/arch/mips/mips-boards/generic/time.c
@@ -75,16 +75,29 @@ static void mips_timer_dispatch (struct pt_regs *regs)
do_IRQ (mips_cpu_timer_irq, regs);
}
+extern int null_perf_irq(struct pt_regs *regs);
+
+extern int (*perf_irq)(struct pt_regs *regs);
+
irqreturn_t mips_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
+ int r2 = cpu_has_mips_r2;
int cpu = smp_processor_id();
if (cpu == 0) {
/*
- * CPU 0 handles the global timer interrupt job and process accounting
- * resets count/compare registers to trigger next timer int.
+ * CPU 0 handles the global timer interrupt job and process
+ * accounting resets count/compare registers to trigger next
+ * timer int.
*/
- timer_interrupt(irq, dev_id, regs);
+ if (!r2 || (read_c0_cause() & (1 << 26)))
+ if (perf_irq(regs))
+ goto out;
+
+ /* we keep interrupt disabled all the time */
+ if (!r2 || (read_c0_cause() & (1 << 30)))
+ timer_interrupt(irq, NULL, regs);
+
scroll_display_message();
} else {
/* Everyone else needs to reset the timer int here as
@@ -101,6 +114,7 @@ irqreturn_t mips_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
local_timer_interrupt (irq, dev_id, regs);
}
+out:
return IRQ_HANDLED;
}
diff --git a/arch/mips/oprofile/op_impl.h b/arch/mips/oprofile/op_impl.h
index f012155..5cfce7d 100644
--- a/arch/mips/oprofile/op_impl.h
+++ b/arch/mips/oprofile/op_impl.h
@@ -12,8 +12,8 @@
struct pt_regs;
-extern void null_perf_irq(struct pt_regs *regs);
-extern void (*perf_irq)(struct pt_regs *regs);
+extern int null_perf_irq(struct pt_regs *regs);
+extern int (*perf_irq)(struct pt_regs *regs);
/* Per-counter configuration as set via oprofilefs. */
struct op_counter_config {
diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
index d36b64d..a4a4aa9 100644
--- a/arch/mips/oprofile/op_model_mipsxx.c
+++ b/arch/mips/oprofile/op_model_mipsxx.c
@@ -114,11 +114,12 @@ static void mipsxx_cpu_stop(void *args)
}
}
-static void mipsxx_perfcount_handler(struct pt_regs *regs)
+static int mipsxx_perfcount_handler(struct pt_regs *regs)
{
unsigned int counters = op_model_mipsxx.num_counters;
unsigned int control;
unsigned int counter;
+ int handled = 0;
switch (counters) {
#define HANDLE_COUNTER(n) \
@@ -129,12 +130,15 @@ static void mipsxx_perfcount_handler(struct pt_regs *regs)
(counter & M_COUNTER_OVERFLOW)) { \
oprofile_add_sample(regs, n); \
write_c0_perfcntr ## n(reg.counter[n]); \
+ handled = 1; \
}
HANDLE_COUNTER(3)
HANDLE_COUNTER(2)
HANDLE_COUNTER(1)
HANDLE_COUNTER(0)
}
+
+ return handled;
}
#define M_CONFIG1_PC (1 << 4)
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