diff options
| author | Maciej W. Rozycki <macro@linux-mips.org> | 2015-04-03 23:32:08 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-08 01:10:45 +0200 |
| commit | f02cf4691e19ab61d4415b2fbfeb64aa8a93757e (patch) | |
| tree | 0fcde09a376f7fe5984aed2d9908592471156eea | |
| parent | 7aecd5ca80d1c08f882a5357ddae8c677c7fd1af (diff) | |
MIPS: DEC: Implement FPU interrupt counter
Implement a cheap way to count FPU interrupts for R2k/R3k DECstation
systems. Do this manually in handcoded assembly, rather than calling
`kstat_incr_irq_this_cpu' that would require setting up a stack frame
and a lot of redirection. This is not going to be a problem because the
FPU interrupt is local to the CPU and also there is one CPU only anyway.
So at bootstrap determine the address of the correct location within
`struct irq_desc', and then only refer to it directly in the interrupt
handler.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9713/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/dec/int-handler.S | 7 | ||||
| -rw-r--r-- | arch/mips/dec/setup.c | 16 |
2 files changed, 19 insertions, 4 deletions
diff --git a/arch/mips/dec/int-handler.S b/arch/mips/dec/int-handler.S index 41a2fa1fa12e..8c6f508e59de 100644 --- a/arch/mips/dec/int-handler.S +++ b/arch/mips/dec/int-handler.S @@ -267,8 +267,13 @@ handle_it: #ifdef CONFIG_32BIT fpu: + lw t0,fpu_kstat_irq + nop + lw t1,(t0) + nop + addu t1,1 j handle_fpe_int - nop + sw t1,(t0) #endif spurious: diff --git a/arch/mips/dec/setup.c b/arch/mips/dec/setup.c index 41bbffd9cc0e..b4f83dd22db6 100644 --- a/arch/mips/dec/setup.c +++ b/arch/mips/dec/setup.c @@ -12,13 +12,15 @@ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/ioport.h> +#include <linux/irq.h> +#include <linux/irqnr.h> #include <linux/module.h> #include <linux/param.h> +#include <linux/percpu-defs.h> #include <linux/sched.h> #include <linux/spinlock.h> #include <linux/types.h> #include <linux/pm.h> -#include <linux/irq.h> #include <asm/bootinfo.h> #include <asm/cpu.h> @@ -98,6 +100,7 @@ int_ptr asic_mask_nr_tbl[DEC_MAX_ASIC_INTS][2] = { { { .i = ~0 }, { .p = asic_intr_unimplemented } }, }; int cpu_fpu_mask = DEC_CPU_IRQ_MASK(DEC_CPU_INR_FPU); +int *fpu_kstat_irq; static struct irqaction ioirq = { .handler = no_action, @@ -755,8 +758,15 @@ void __init arch_init_irq(void) dec_interrupt[DEC_IRQ_HALT] = -1; /* Register board interrupts: FPU and cascade. */ - if (dec_interrupt[DEC_IRQ_FPU] >= 0) - setup_irq(dec_interrupt[DEC_IRQ_FPU], &fpuirq); + if (dec_interrupt[DEC_IRQ_FPU] >= 0) { + struct irq_desc *desc_fpu; + int irq_fpu; + + irq_fpu = dec_interrupt[DEC_IRQ_FPU]; + setup_irq(irq_fpu, &fpuirq); + desc_fpu = irq_to_desc(irq_fpu); + fpu_kstat_irq = this_cpu_ptr(desc_fpu->kstat_irqs); + } if (dec_interrupt[DEC_IRQ_CASCADE] >= 0) setup_irq(dec_interrupt[DEC_IRQ_CASCADE], &ioirq); |