diff options
Diffstat (limited to 'arch/powerpc/oprofile/op_model_rs64.c')
| -rw-r--r-- | arch/powerpc/oprofile/op_model_rs64.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/arch/powerpc/oprofile/op_model_rs64.c b/arch/powerpc/oprofile/op_model_rs64.c new file mode 100644 index 000000000000..e010b85996e8 --- /dev/null +++ b/arch/powerpc/oprofile/op_model_rs64.c @@ -0,0 +1,218 @@ +/* + * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/oprofile.h> +#include <linux/init.h> +#include <linux/smp.h> +#include <asm/ptrace.h> +#include <asm/system.h> +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/oprofile_impl.h> + +#define dbg(args...) + +static void ctrl_write(unsigned int i, unsigned int val) +{ + unsigned int tmp = 0; + unsigned long shift = 0, mask = 0; + + dbg("ctrl_write %d %x\n", i, val); + + switch(i) { + case 0: + tmp = mfspr(SPRN_MMCR0); + shift = 6; + mask = 0x7F; + break; + case 1: + tmp = mfspr(SPRN_MMCR0); + shift = 0; + mask = 0x3F; + break; + case 2: + tmp = mfspr(SPRN_MMCR1); + shift = 31 - 4; + mask = 0x1F; + break; + case 3: + tmp = mfspr(SPRN_MMCR1); + shift = 31 - 9; + mask = 0x1F; + break; + case 4: + tmp = mfspr(SPRN_MMCR1); + shift = 31 - 14; + mask = 0x1F; + break; + case 5: + tmp = mfspr(SPRN_MMCR1); + shift = 31 - 19; + mask = 0x1F; + break; + case 6: + tmp = mfspr(SPRN_MMCR1); + shift = 31 - 24; + mask = 0x1F; + break; + case 7: + tmp = mfspr(SPRN_MMCR1); + shift = 31 - 28; + mask = 0xF; + break; + } + + tmp = tmp & ~(mask << shift); + tmp |= val << shift; + + switch(i) { + case 0: + case 1: + mtspr(SPRN_MMCR0, tmp); + break; + default: + mtspr(SPRN_MMCR1, tmp); + } + + dbg("ctrl_write mmcr0 %lx mmcr1 %lx\n", mfspr(SPRN_MMCR0), + mfspr(SPRN_MMCR1)); +} + +static unsigned long reset_value[OP_MAX_COUNTER]; + +static int num_counters; + +static void rs64_reg_setup(struct op_counter_config *ctr, + struct op_system_config *sys, + int num_ctrs) +{ + int i; + + num_counters = num_ctrs; + + for (i = 0; i < num_counters; ++i) + reset_value[i] = 0x80000000UL - ctr[i].count; + + /* XXX setup user and kernel profiling */ +} + +static void rs64_cpu_setup(void *unused) +{ + unsigned int mmcr0; + + /* reset MMCR0 and set the freeze bit */ + mmcr0 = MMCR0_FC; + mtspr(SPRN_MMCR0, mmcr0); + + /* reset MMCR1, MMCRA */ + mtspr(SPRN_MMCR1, 0); + + if (cpu_has_feature(CPU_FTR_MMCRA)) + mtspr(SPRN_MMCRA, 0); + + mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE; + /* Only applies to POWER3, but should be safe on RS64 */ + mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE; + mtspr(SPRN_MMCR0, mmcr0); + + dbg("setup on cpu %d, mmcr0 %lx\n", smp_processor_id(), + mfspr(SPRN_MMCR0)); + dbg("setup on cpu %d, mmcr1 %lx\n", smp_processor_id(), + mfspr(SPRN_MMCR1)); +} + +static void rs64_start(struct op_counter_config *ctr) +{ + int i; + unsigned int mmcr0; + + /* set the PMM bit (see comment below) */ + mtmsrd(mfmsr() | MSR_PMM); + + for (i = 0; i < num_counters; ++i) { + if (ctr[i].enabled) { + ctr_write(i, reset_value[i]); + ctrl_write(i, ctr[i].event); + } else { + ctr_write(i, 0); + } + } + + mmcr0 = mfspr(SPRN_MMCR0); + + /* + * now clear the freeze bit, counting will not start until we + * rfid from this excetion, because only at that point will + * the PMM bit be cleared + */ + mmcr0 &= ~MMCR0_FC; + mtspr(SPRN_MMCR0, mmcr0); + + dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0); +} + +static void rs64_stop(void) +{ + unsigned int mmcr0; + + /* freeze counters */ + mmcr0 = mfspr(SPRN_MMCR0); + mmcr0 |= MMCR0_FC; + mtspr(SPRN_MMCR0, mmcr0); + + dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0); + + mb(); +} + +static void rs64_handle_interrupt(struct pt_regs *regs, + struct op_counter_config *ctr) +{ + unsigned int mmcr0; + int val; + int i; + unsigned long pc = mfspr(SPRN_SIAR); + int is_kernel = (pc >= KERNELBASE); + + /* set the PMM bit (see comment below) */ + mtmsrd(mfmsr() | MSR_PMM); + + for (i = 0; i < num_counters; ++i) { + val = ctr_read(i); + if (val < 0) { + if (ctr[i].enabled) { + oprofile_add_pc(pc, is_kernel, i); + ctr_write(i, reset_value[i]); + } else { + ctr_write(i, 0); + } + } + } + + mmcr0 = mfspr(SPRN_MMCR0); + + /* reset the perfmon trigger */ + mmcr0 |= MMCR0_PMXE; + + /* + * now clear the freeze bit, counting will not start until we + * rfid from this exception, because only at that point will + * the PMM bit be cleared + */ + mmcr0 &= ~MMCR0_FC; + mtspr(SPRN_MMCR0, mmcr0); +} + +struct op_powerpc_model op_model_rs64 = { + .reg_setup = rs64_reg_setup, + .cpu_setup = rs64_cpu_setup, + .start = rs64_start, + .stop = rs64_stop, + .handle_interrupt = rs64_handle_interrupt, +}; |