powerpc/perf: Define perf_event_print_debug() to print PMU register values
Currently the sysrq ShowRegs command does not print any PMU registers as we have an empty definition for perf_event_print_debug(). This patch defines perf_event_print_debug() to print various PMU registers. Example output: CPU: 0 PMU registers, ppmu = POWER7 n_counters = 6 PMC1: 00000000 PMC2: 00000000 PMC3: 00000000 PMC4: 00000000 PMC5: 00000000 PMC6: 00000000 PMC7: deadbeef PMC8: deadbeef MMCR0: 0000000080000000 MMCR1: 0000000000000000 MMCRA: 0f00000001000000 SIAR: 0000000000000000 SDAR: 0000000000000000 SIER: 0000000000000000 Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> [mpe: Fix 32 bit build and rework formatting for compactness] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -14,6 +14,7 @@
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#include <linux/device.h>
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#include <uapi/asm/perf_event.h>
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/* Update perf_event_print_debug() if this changes */
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#define MAX_HWEVENTS 8
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#define MAX_EVENT_ALTERNATIVES 8
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#define MAX_LIMITED_HWCOUNTERS 2
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@ -563,10 +563,6 @@ out:
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static void perf_event_interrupt(struct pt_regs *regs);
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void perf_event_print_debug(void)
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{
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}
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/*
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* Read one performance monitor counter (PMC).
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*/
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@ -645,6 +641,57 @@ static void write_pmc(int idx, unsigned long val)
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}
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}
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/* Called from sysrq_handle_showregs() */
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void perf_event_print_debug(void)
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{
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unsigned long sdar, sier, flags;
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u32 pmcs[MAX_HWEVENTS];
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int i;
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if (!ppmu->n_counter)
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return;
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local_irq_save(flags);
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pr_info("CPU: %d PMU registers, ppmu = %s n_counters = %d",
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smp_processor_id(), ppmu->name, ppmu->n_counter);
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for (i = 0; i < ppmu->n_counter; i++)
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pmcs[i] = read_pmc(i + 1);
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for (; i < MAX_HWEVENTS; i++)
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pmcs[i] = 0xdeadbeef;
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pr_info("PMC1: %08x PMC2: %08x PMC3: %08x PMC4: %08x\n",
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pmcs[0], pmcs[1], pmcs[2], pmcs[3]);
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if (ppmu->n_counter > 4)
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pr_info("PMC5: %08x PMC6: %08x PMC7: %08x PMC8: %08x\n",
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pmcs[4], pmcs[5], pmcs[6], pmcs[7]);
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pr_info("MMCR0: %016lx MMCR1: %016lx MMCRA: %016lx\n",
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mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCRA));
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sdar = sier = 0;
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#ifdef CONFIG_PPC64
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sdar = mfspr(SPRN_SDAR);
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if (ppmu->flags & PPMU_HAS_SIER)
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sier = mfspr(SPRN_SIER);
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if (ppmu->flags & PPMU_EBB) {
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pr_info("MMCR2: %016lx EBBHR: %016lx\n",
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mfspr(SPRN_MMCR2), mfspr(SPRN_EBBHR));
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pr_info("EBBRR: %016lx BESCR: %016lx\n",
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mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR));
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}
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#endif
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pr_info("SIAR: %016lx SDAR: %016lx SIER: %016lx\n",
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mfspr(SPRN_SIAR), sdar, sier);
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local_irq_restore(flags);
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}
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/*
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* Check if a set of events can all go on the PMU at once.
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* If they can't, this will look at alternative codes for the events
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