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MIPS: perf: Add cpu feature bit for PCI (performance counter interrupt) 

The PCI (Program Counter Interrupt) bit in the "cause" register
is mandatory for MIPS32R2 cores, but has also been added to some R1
cores (BMIPS5000). This change adds a cpu feature bit to make it
easier to check for and use this feature.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4106/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Al Cooper 2012-07-13 16:44:51 -04:00 committed by Ralf Baechle
parent c5600b2dd9
commit da4b62cd67
5 changed files with 13 additions and 3 deletions
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4
arch/mips/include/asm/cpu-features.h
View File

@ -252,4 +252,8 @@
#define cpu_hwrena_impl_bits 0
#endif
#ifndef cpu_has_perf_cntr_intr_bit
#define cpu_has_perf_cntr_intr_bit (cpu_data[0].options & MIPS_CPU_PCI)
#endif
#endif /* __ASM_CPU_FEATURES_H */

3
arch/mips/include/asm/cpu.h
View File

@ -320,7 +320,8 @@ enum cpu_type_enum {
#define MIPS_CPU_VINT 0x00080000 /* CPU supports MIPSR2 vectored interrupts */
#define MIPS_CPU_VEIC 0x00100000 /* CPU supports MIPSR2 external interrupt controller mode */
#define MIPS_CPU_ULRI 0x00200000 /* CPU has ULRI feature */
#define MIPS_CPU_RIXI 0x00400000 /* CPU has TLB Read/eXec Inhibit */
#define MIPS_CPU_PCI 0x00400000 /* CPU has Perf Ctr Int indicator */
#define MIPS_CPU_RIXI 0x00800000 /* CPU has TLB Read/eXec Inhibit */
/*
* CPU ASE encodings

2
arch/mips/include/asm/mipsregs.h
View File

@ -458,6 +458,8 @@
#define CAUSEF_IP7 (_ULCAST_(1) << 15)
#define CAUSEB_IV 23
#define CAUSEF_IV (_ULCAST_(1) << 23)
#define CAUSEB_PCI 26
#define CAUSEF_PCI (_ULCAST_(1) << 26)
#define CAUSEB_CE 28
#define CAUSEF_CE (_ULCAST_(3) << 28)
#define CAUSEB_TI 30

5
arch/mips/kernel/cpu-probe.c
View File

@ -1194,8 +1194,11 @@ __cpuinit void cpu_probe(void)
}
}
if (cpu_has_mips_r2)
if (cpu_has_mips_r2) {
c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
/* R2 has Performance Counter Interrupt indicator */
c->options |= MIPS_CPU_PCI;
}
else
c->srsets = 1;

2
arch/mips/kernel/perf_event_mipsxx.c
View File

@ -1158,7 +1158,7 @@ static int mipsxx_pmu_handle_shared_irq(void)
int handled = IRQ_NONE;
struct pt_regs *regs;
if (cpu_has_mips_r2 && !(read_c0_cause() & (1 << 26)))
if (cpu_has_perf_cntr_intr_bit && !(read_c0_cause() & CAUSEF_PCI))
return handled;
/*
* First we pause the local counters, so that when we are locked