356 lines
6.5 KiB
C
356 lines
6.5 KiB
C
/*
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* Freescale Embedded oprofile support, based on ppc64 oprofile support
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* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* Copyright (c) 2004, 2010 Freescale Semiconductor, Inc
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*
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* Author: Andy Fleming
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* Maintainer: Kumar Gala <galak@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/oprofile.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/reg_fsl_emb.h>
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#include <asm/page.h>
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#include <asm/pmc.h>
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#include <asm/oprofile_impl.h>
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static unsigned long reset_value[OP_MAX_COUNTER];
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static int num_counters;
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static int oprofile_running;
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static inline u32 get_pmlca(int ctr)
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{
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u32 pmlca;
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switch (ctr) {
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case 0:
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pmlca = mfpmr(PMRN_PMLCA0);
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break;
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case 1:
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pmlca = mfpmr(PMRN_PMLCA1);
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break;
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case 2:
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pmlca = mfpmr(PMRN_PMLCA2);
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break;
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case 3:
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pmlca = mfpmr(PMRN_PMLCA3);
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break;
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default:
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panic("Bad ctr number\n");
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}
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return pmlca;
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}
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static inline void set_pmlca(int ctr, u32 pmlca)
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{
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switch (ctr) {
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case 0:
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mtpmr(PMRN_PMLCA0, pmlca);
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break;
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case 1:
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mtpmr(PMRN_PMLCA1, pmlca);
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break;
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case 2:
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mtpmr(PMRN_PMLCA2, pmlca);
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break;
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case 3:
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mtpmr(PMRN_PMLCA3, pmlca);
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break;
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default:
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panic("Bad ctr number\n");
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}
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}
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static inline unsigned int ctr_read(unsigned int i)
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{
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switch(i) {
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case 0:
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return mfpmr(PMRN_PMC0);
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case 1:
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return mfpmr(PMRN_PMC1);
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case 2:
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return mfpmr(PMRN_PMC2);
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case 3:
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return mfpmr(PMRN_PMC3);
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default:
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return 0;
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}
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}
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static inline void ctr_write(unsigned int i, unsigned int val)
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{
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switch(i) {
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case 0:
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mtpmr(PMRN_PMC0, val);
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break;
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case 1:
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mtpmr(PMRN_PMC1, val);
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break;
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case 2:
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mtpmr(PMRN_PMC2, val);
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break;
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case 3:
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mtpmr(PMRN_PMC3, val);
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break;
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default:
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break;
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}
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}
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static void init_pmc_stop(int ctr)
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{
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u32 pmlca = (PMLCA_FC | PMLCA_FCS | PMLCA_FCU |
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PMLCA_FCM1 | PMLCA_FCM0);
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u32 pmlcb = 0;
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switch (ctr) {
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case 0:
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mtpmr(PMRN_PMLCA0, pmlca);
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mtpmr(PMRN_PMLCB0, pmlcb);
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break;
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case 1:
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mtpmr(PMRN_PMLCA1, pmlca);
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mtpmr(PMRN_PMLCB1, pmlcb);
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break;
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case 2:
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mtpmr(PMRN_PMLCA2, pmlca);
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mtpmr(PMRN_PMLCB2, pmlcb);
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break;
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case 3:
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mtpmr(PMRN_PMLCA3, pmlca);
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mtpmr(PMRN_PMLCB3, pmlcb);
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break;
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default:
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panic("Bad ctr number!\n");
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}
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}
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static void set_pmc_event(int ctr, int event)
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{
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u32 pmlca;
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pmlca = get_pmlca(ctr);
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pmlca = (pmlca & ~PMLCA_EVENT_MASK) |
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((event << PMLCA_EVENT_SHIFT) &
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PMLCA_EVENT_MASK);
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set_pmlca(ctr, pmlca);
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}
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static void set_pmc_user_kernel(int ctr, int user, int kernel)
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{
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u32 pmlca;
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pmlca = get_pmlca(ctr);
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if(user)
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pmlca &= ~PMLCA_FCU;
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else
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pmlca |= PMLCA_FCU;
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if(kernel)
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pmlca &= ~PMLCA_FCS;
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else
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pmlca |= PMLCA_FCS;
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set_pmlca(ctr, pmlca);
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}
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static void set_pmc_marked(int ctr, int mark0, int mark1)
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{
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u32 pmlca = get_pmlca(ctr);
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if(mark0)
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pmlca &= ~PMLCA_FCM0;
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else
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pmlca |= PMLCA_FCM0;
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if(mark1)
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pmlca &= ~PMLCA_FCM1;
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else
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pmlca |= PMLCA_FCM1;
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set_pmlca(ctr, pmlca);
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}
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static void pmc_start_ctr(int ctr, int enable)
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{
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u32 pmlca = get_pmlca(ctr);
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pmlca &= ~PMLCA_FC;
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if (enable)
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pmlca |= PMLCA_CE;
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else
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pmlca &= ~PMLCA_CE;
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set_pmlca(ctr, pmlca);
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}
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static void pmc_start_ctrs(int enable)
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{
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u32 pmgc0 = mfpmr(PMRN_PMGC0);
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pmgc0 &= ~PMGC0_FAC;
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pmgc0 |= PMGC0_FCECE;
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if (enable)
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pmgc0 |= PMGC0_PMIE;
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else
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pmgc0 &= ~PMGC0_PMIE;
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mtpmr(PMRN_PMGC0, pmgc0);
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}
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static void pmc_stop_ctrs(void)
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{
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u32 pmgc0 = mfpmr(PMRN_PMGC0);
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pmgc0 |= PMGC0_FAC;
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pmgc0 &= ~(PMGC0_PMIE | PMGC0_FCECE);
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mtpmr(PMRN_PMGC0, pmgc0);
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}
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static int fsl_emb_cpu_setup(struct op_counter_config *ctr)
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{
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int i;
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/* freeze all counters */
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pmc_stop_ctrs();
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for (i = 0;i < num_counters;i++) {
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init_pmc_stop(i);
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set_pmc_event(i, ctr[i].event);
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set_pmc_user_kernel(i, ctr[i].user, ctr[i].kernel);
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}
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return 0;
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}
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static int fsl_emb_reg_setup(struct op_counter_config *ctr,
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struct op_system_config *sys,
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int num_ctrs)
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{
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int i;
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num_counters = num_ctrs;
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/* Our counters count up, and "count" refers to
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* how much before the next interrupt, and we interrupt
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* on overflow. So we calculate the starting value
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* which will give us "count" until overflow.
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* Then we set the events on the enabled counters */
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for (i = 0; i < num_counters; ++i)
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reset_value[i] = 0x80000000UL - ctr[i].count;
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return 0;
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}
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static int fsl_emb_start(struct op_counter_config *ctr)
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{
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int i;
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mtmsr(mfmsr() | MSR_PMM);
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for (i = 0; i < num_counters; ++i) {
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if (ctr[i].enabled) {
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ctr_write(i, reset_value[i]);
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/* Set each enabled counter to only
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* count when the Mark bit is *not* set */
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set_pmc_marked(i, 1, 0);
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pmc_start_ctr(i, 1);
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} else {
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ctr_write(i, 0);
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/* Set the ctr to be stopped */
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pmc_start_ctr(i, 0);
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}
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}
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/* Clear the freeze bit, and enable the interrupt.
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* The counters won't actually start until the rfi clears
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* the PMM bit */
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pmc_start_ctrs(1);
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oprofile_running = 1;
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pr_debug("start on cpu %d, pmgc0 %x\n", smp_processor_id(),
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mfpmr(PMRN_PMGC0));
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return 0;
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}
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static void fsl_emb_stop(void)
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{
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/* freeze counters */
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pmc_stop_ctrs();
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oprofile_running = 0;
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pr_debug("stop on cpu %d, pmgc0 %x\n", smp_processor_id(),
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mfpmr(PMRN_PMGC0));
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mb();
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}
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static void fsl_emb_handle_interrupt(struct pt_regs *regs,
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struct op_counter_config *ctr)
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{
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unsigned long pc;
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int is_kernel;
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int val;
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int i;
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pc = regs->nip;
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is_kernel = is_kernel_addr(pc);
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for (i = 0; i < num_counters; ++i) {
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val = ctr_read(i);
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if (val < 0) {
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if (oprofile_running && ctr[i].enabled) {
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oprofile_add_ext_sample(pc, regs, i, is_kernel);
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ctr_write(i, reset_value[i]);
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} else {
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ctr_write(i, 0);
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}
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}
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}
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/* The freeze bit was set by the interrupt. */
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/* Clear the freeze bit, and reenable the interrupt. The
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* counters won't actually start until the rfi clears the PMM
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* bit. The PMM bit should not be set until after the interrupt
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* is cleared to avoid it getting lost in some hypervisor
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* environments.
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*/
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mtmsr(mfmsr() | MSR_PMM);
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pmc_start_ctrs(1);
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}
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struct op_powerpc_model op_model_fsl_emb = {
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.reg_setup = fsl_emb_reg_setup,
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.cpu_setup = fsl_emb_cpu_setup,
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.start = fsl_emb_start,
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.stop = fsl_emb_stop,
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.handle_interrupt = fsl_emb_handle_interrupt,
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};
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