diff options
Diffstat (limited to 'arch/alpha/oprofile/op_model_ev67.c')
| -rw-r--r-- | arch/alpha/oprofile/op_model_ev67.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/arch/alpha/oprofile/op_model_ev67.c b/arch/alpha/oprofile/op_model_ev67.c new file mode 100644 index 0000000..7030208 --- /dev/null +++ b/arch/alpha/oprofile/op_model_ev67.c @@ -0,0 +1,263 @@ +/** + * @file arch/alpha/oprofile/op_model_ev67.c + * + * @remark Copyright 2002 OProfile authors + * @remark Read the file COPYING + * + * @author Richard Henderson <rth@twiddle.net> + * @author Falk Hueffner <falk@debian.org> + */ + +#include <linux/oprofile.h> +#include <linux/init.h> +#include <linux/smp.h> +#include <asm/ptrace.h> +#include <asm/system.h> + +#include "op_impl.h" + + +/* Compute all of the registers in preparation for enabling profiling. */ + +static void +ev67_reg_setup(struct op_register_config *reg, + struct op_counter_config *ctr, + struct op_system_config *sys) +{ + unsigned long ctl, reset, need_reset, i; + + /* Select desired events. */ + ctl = 1UL << 4; /* Enable ProfileMe mode. */ + + /* The event numbers are chosen so we can use them directly if + PCTR1 is enabled. */ + if (ctr[1].enabled) { + ctl |= (ctr[1].event & 3) << 2; + } else { + if (ctr[0].event == 0) /* cycles */ + ctl |= 1UL << 2; + } + reg->mux_select = ctl; + + /* Select logging options. */ + /* ??? Need to come up with some mechanism to trace only + selected processes. EV67 does not have a mechanism to + select kernel or user mode only. For now, enable always. */ + reg->proc_mode = 0; + + /* EV67 cannot change the width of the counters as with the + other implementations. But fortunately, we can write to + the counters and set the value such that it will overflow + at the right time. */ + reset = need_reset = 0; + for (i = 0; i < 2; ++i) { + unsigned long count = ctr[i].count; + if (!ctr[i].enabled) + continue; + + if (count > 0x100000) + count = 0x100000; + ctr[i].count = count; + reset |= (0x100000 - count) << (i ? 6 : 28); + if (count != 0x100000) + need_reset |= 1 << i; + } + reg->reset_values = reset; + reg->need_reset = need_reset; +} + +/* Program all of the registers in preparation for enabling profiling. */ + +static void +ev67_cpu_setup (void *x) +{ + struct op_register_config *reg = x; + + wrperfmon(2, reg->mux_select); + wrperfmon(3, reg->proc_mode); + wrperfmon(6, reg->reset_values | 3); +} + +/* CTR is a counter for which the user has requested an interrupt count + in between one of the widths selectable in hardware. Reset the count + for CTR to the value stored in REG->RESET_VALUES. */ + +static void +ev67_reset_ctr(struct op_register_config *reg, unsigned long ctr) +{ + wrperfmon(6, reg->reset_values | (1 << ctr)); +} + +/* ProfileMe conditions which will show up as counters. We can also + detect the following, but it seems unlikely that anybody is + interested in counting them: + * Reset + * MT_FPCR (write to floating point control register) + * Arithmetic trap + * Dstream Fault + * Machine Check (ECC fault, etc.) + * OPCDEC (illegal opcode) + * Floating point disabled + * Differentiate between DTB single/double misses and 3 or 4 level + page tables + * Istream access violation + * Interrupt + * Icache Parity Error. + * Instruction killed (nop, trapb) + + Unfortunately, there seems to be no way to detect Dcache and Bcache + misses; the latter could be approximated by making the counter + count Bcache misses, but that is not precise. + + We model this as 20 counters: + * PCTR0 + * PCTR1 + * 9 ProfileMe events, induced by PCTR0 + * 9 ProfileMe events, induced by PCTR1 +*/ + +enum profileme_counters { + PM_STALLED, /* Stalled for at least one cycle + between the fetch and map stages */ + PM_TAKEN, /* Conditional branch taken */ + PM_MISPREDICT, /* Branch caused mispredict trap */ + PM_ITB_MISS, /* ITB miss */ + PM_DTB_MISS, /* DTB miss */ + PM_REPLAY, /* Replay trap */ + PM_LOAD_STORE, /* Load-store order trap */ + PM_ICACHE_MISS, /* Icache miss */ + PM_UNALIGNED, /* Unaligned Load/Store */ + PM_NUM_COUNTERS +}; + +static inline void +op_add_pm(unsigned long pc, int kern, unsigned long counter, + struct op_counter_config *ctr, unsigned long event) +{ + unsigned long fake_counter = 2 + event; + if (counter == 1) + fake_counter += PM_NUM_COUNTERS; + if (ctr[fake_counter].enabled) + oprofile_add_pc(pc, kern, fake_counter); +} + +static void +ev67_handle_interrupt(unsigned long which, struct pt_regs *regs, + struct op_counter_config *ctr) +{ + unsigned long pmpc, pctr_ctl; + int kern = !user_mode(regs); + int mispredict = 0; + union { + unsigned long v; + struct { + unsigned reserved: 30; /* 0-29 */ + unsigned overcount: 3; /* 30-32 */ + unsigned icache_miss: 1; /* 33 */ + unsigned trap_type: 4; /* 34-37 */ + unsigned load_store: 1; /* 38 */ + unsigned trap: 1; /* 39 */ + unsigned mispredict: 1; /* 40 */ + } fields; + } i_stat; + + enum trap_types { + TRAP_REPLAY, + TRAP_INVALID0, + TRAP_DTB_DOUBLE_MISS_3, + TRAP_DTB_DOUBLE_MISS_4, + TRAP_FP_DISABLED, + TRAP_UNALIGNED, + TRAP_DTB_SINGLE_MISS, + TRAP_DSTREAM_FAULT, + TRAP_OPCDEC, + TRAP_INVALID1, + TRAP_MACHINE_CHECK, + TRAP_INVALID2, + TRAP_ARITHMETIC, + TRAP_INVALID3, + TRAP_MT_FPCR, + TRAP_RESET + }; + + pmpc = wrperfmon(9, 0); + /* ??? Don't know how to handle physical-mode PALcode address. */ + if (pmpc & 1) + return; + pmpc &= ~2; /* clear reserved bit */ + + i_stat.v = wrperfmon(8, 0); + if (i_stat.fields.trap) { + switch (i_stat.fields.trap_type) { + case TRAP_INVALID1: + case TRAP_INVALID2: + case TRAP_INVALID3: + /* Pipeline redirection ocurred. PMPC points + to PALcode. Recognize ITB miss by PALcode + offset address, and get actual PC from + EXC_ADDR. */ + oprofile_add_pc(regs->pc, kern, which); + if ((pmpc & ((1 << 15) - 1)) == 581) + op_add_pm(regs->pc, kern, which, + ctr, PM_ITB_MISS); + /* Most other bit and counter values will be + those for the first instruction in the + fault handler, so we're done. */ + return; + case TRAP_REPLAY: + op_add_pm(pmpc, kern, which, ctr, + (i_stat.fields.load_store + ? PM_LOAD_STORE : PM_REPLAY)); + break; + case TRAP_DTB_DOUBLE_MISS_3: + case TRAP_DTB_DOUBLE_MISS_4: + case TRAP_DTB_SINGLE_MISS: + op_add_pm(pmpc, kern, which, ctr, PM_DTB_MISS); + break; + case TRAP_UNALIGNED: + op_add_pm(pmpc, kern, which, ctr, PM_UNALIGNED); + break; + case TRAP_INVALID0: + case TRAP_FP_DISABLED: + case TRAP_DSTREAM_FAULT: + case TRAP_OPCDEC: + case TRAP_MACHINE_CHECK: + case TRAP_ARITHMETIC: + case TRAP_MT_FPCR: + case TRAP_RESET: + break; + } + + /* ??? JSR/JMP/RET/COR or HW_JSR/HW_JMP/HW_RET/HW_COR + mispredicts do not set this bit but can be + recognized by the presence of one of these + instructions at the PMPC location with bit 39 + set. */ + if (i_stat.fields.mispredict) { + mispredict = 1; + op_add_pm(pmpc, kern, which, ctr, PM_MISPREDICT); + } + } + + oprofile_add_pc(pmpc, kern, which); + + pctr_ctl = wrperfmon(5, 0); + if (pctr_ctl & (1UL << 27)) + op_add_pm(pmpc, kern, which, ctr, PM_STALLED); + + /* Unfortunately, TAK is undefined on mispredicted branches. + ??? It is also undefined for non-cbranch insns, should + check that. */ + if (!mispredict && pctr_ctl & (1UL << 0)) + op_add_pm(pmpc, kern, which, ctr, PM_TAKEN); +} + +struct op_axp_model op_model_ev67 = { + .reg_setup = ev67_reg_setup, + .cpu_setup = ev67_cpu_setup, + .reset_ctr = ev67_reset_ctr, + .handle_interrupt = ev67_handle_interrupt, + .cpu_type = "alpha/ev67", + .num_counters = 20, + .can_set_proc_mode = 0, +}; |
