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Merge branch 'oprofile/cell' into oprofile/oprofile-for-tip

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This commit is contained in:
Robert Richter 2009-01-08 15:54:04 +01:00
commit a076aa4f96
6 changed files with 719 additions and 154 deletions
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2
arch/powerpc/include/asm/cell-pmu.h
View File

@ -37,9 +37,11 @@
#define CBE_PM_STOP_AT_MAX 0x40000000
#define CBE_PM_TRACE_MODE_GET(pm_control) (((pm_control) >> 28) & 0x3)
#define CBE_PM_TRACE_MODE_SET(mode) (((mode) & 0x3) << 28)
#define CBE_PM_TRACE_BUF_OVFLW(bit) (((bit) & 0x1) << 17)
#define CBE_PM_COUNT_MODE_SET(count) (((count) & 0x3) << 18)
#define CBE_PM_FREEZE_ALL_CTRS 0x00100000
#define CBE_PM_ENABLE_EXT_TRACE 0x00008000
#define CBE_PM_SPU_ADDR_TRACE_SET(msk) (((msk) & 0x3) << 9)
/* Macros for the trace_address register. */
#define CBE_PM_TRACE_BUF_FULL 0x00000800

6
arch/powerpc/include/asm/oprofile_impl.h
View File

@ -32,6 +32,12 @@ struct op_system_config {
unsigned long mmcr0;
unsigned long mmcr1;
unsigned long mmcra;
#ifdef CONFIG_OPROFILE_CELL
/* Register for oprofile user tool to check cell kernel profiling
* suport.
*/
unsigned long cell_support;
#endif
#endif
unsigned long enable_kernel;
unsigned long enable_user;

11
arch/powerpc/oprofile/cell/pr_util.h
View File

@ -30,6 +30,10 @@
extern struct delayed_work spu_work;
extern int spu_prof_running;
#define TRACE_ARRAY_SIZE 1024
extern spinlock_t oprof_spu_smpl_arry_lck;
struct spu_overlay_info { /* map of sections within an SPU overlay */
unsigned int vma; /* SPU virtual memory address from elf */
unsigned int size; /* size of section from elf */
@ -89,10 +93,11 @@ void vma_map_free(struct vma_to_fileoffset_map *map);
* Entry point for SPU profiling.
* cycles_reset is the SPU_CYCLES count value specified by the user.
*/
int start_spu_profiling(unsigned int cycles_reset);
void stop_spu_profiling(void);
int start_spu_profiling_cycles(unsigned int cycles_reset);
void start_spu_profiling_events(void);
void stop_spu_profiling_cycles(void);
void stop_spu_profiling_events(void);
/* add the necessary profiling hooks */
int spu_sync_start(void);

56
arch/powerpc/oprofile/cell/spu_profiler.c
View File

@ -18,11 +18,21 @@
#include <asm/cell-pmu.h>
#include "pr_util.h"
#define TRACE_ARRAY_SIZE 1024
#define SCALE_SHIFT 14
static u32 *samples;
/* spu_prof_running is a flag used to indicate if spu profiling is enabled
* or not. It is set by the routines start_spu_profiling_cycles() and
* start_spu_profiling_events(). The flag is cleared by the routines
* stop_spu_profiling_cycles() and stop_spu_profiling_events(). These
* routines are called via global_start() and global_stop() which are called in
* op_powerpc_start() and op_powerpc_stop(). These routines are called once
* per system as a result of the user starting/stopping oprofile. Hence, only
* one CPU per user at a time will be changing the value of spu_prof_running.
* In general, OProfile does not protect against multiple users trying to run
* OProfile at a time.
*/
int spu_prof_running;
static unsigned int profiling_interval;
@ -31,8 +41,8 @@ static unsigned int profiling_interval;
#define SPU_PC_MASK 0xFFFF
static DEFINE_SPINLOCK(sample_array_lock);
unsigned long sample_array_lock_flags;
DEFINE_SPINLOCK(oprof_spu_smpl_arry_lck);
unsigned long oprof_spu_smpl_arry_lck_flags;
void set_spu_profiling_frequency(unsigned int freq_khz, unsigned int cycles_reset)
{
@ -145,13 +155,13 @@ static enum hrtimer_restart profile_spus(struct hrtimer *timer)
* sample array must be loaded and then processed for a given
* cpu. The sample array is not per cpu.
*/
spin_lock_irqsave(&sample_array_lock,
sample_array_lock_flags);
spin_lock_irqsave(&oprof_spu_smpl_arry_lck,
oprof_spu_smpl_arry_lck_flags);
num_samples = cell_spu_pc_collection(cpu);
if (num_samples == 0) {
spin_unlock_irqrestore(&sample_array_lock,
sample_array_lock_flags);
spin_unlock_irqrestore(&oprof_spu_smpl_arry_lck,
oprof_spu_smpl_arry_lck_flags);
continue;
}
@ -162,8 +172,8 @@ static enum hrtimer_restart profile_spus(struct hrtimer *timer)
num_samples);
}
spin_unlock_irqrestore(&sample_array_lock,
sample_array_lock_flags);
spin_unlock_irqrestore(&oprof_spu_smpl_arry_lck,
oprof_spu_smpl_arry_lck_flags);
}
smp_wmb(); /* insure spu event buffer updates are written */
@ -182,13 +192,13 @@ static enum hrtimer_restart profile_spus(struct hrtimer *timer)
static struct hrtimer timer;
/*
* Entry point for SPU profiling.
* Entry point for SPU cycle profiling.
* NOTE: SPU profiling is done system-wide, not per-CPU.
*
* cycles_reset is the count value specified by the user when
* setting up OProfile to count SPU_CYCLES.
*/
int start_spu_profiling(unsigned int cycles_reset)
int start_spu_profiling_cycles(unsigned int cycles_reset)
{
ktime_t kt;
@ -212,10 +222,30 @@ int start_spu_profiling(unsigned int cycles_reset)
return 0;
}
void stop_spu_profiling(void)
/*
* Entry point for SPU event profiling.
* NOTE: SPU profiling is done system-wide, not per-CPU.
*
* cycles_reset is the count value specified by the user when
* setting up OProfile to count SPU_CYCLES.
*/
void start_spu_profiling_events(void)
{
spu_prof_running = 1;
schedule_delayed_work(&spu_work, DEFAULT_TIMER_EXPIRE);
return;
}
void stop_spu_profiling_cycles(void)
{
spu_prof_running = 0;
hrtimer_cancel(&timer);
kfree(samples);
pr_debug("SPU_PROF: stop_spu_profiling issued\n");
pr_debug("SPU_PROF: stop_spu_profiling_cycles issued\n");
}
void stop_spu_profiling_events(void)
{
spu_prof_running = 0;
}

22
arch/powerpc/oprofile/common.c
View File

@ -132,6 +132,28 @@ static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
#ifdef CONFIG_OPROFILE_CELL
/* create a file the user tool can check to see what level of profiling
* support exits with this kernel. Initialize bit mask to indicate
* what support the kernel has:
* bit 0 - Supports SPU event profiling in addition to PPU
* event and cycles; and SPU cycle profiling
* bits 1-31 - Currently unused.
*
* If the file does not exist, then the kernel only supports SPU
* cycle profiling, PPU event and cycle profiling.
*/
oprofilefs_create_ulong(sb, root, "cell_support", &sys.cell_support);
sys.cell_support = 0x1; /* Note, the user OProfile tool must check
* that this bit is set before attempting to
* user SPU event profiling. Older kernels
* will not have this file, hence the user
* tool is not allowed to do SPU event
* profiling on older kernels. Older kernels
* will accept SPU events but collected data
* is garbage.
*/
#endif
#endif
for (i = 0; i < model->num_counters; ++i) {

776
arch/powerpc/oprofile/op_model_cell.c
View File

@ -40,14 +40,15 @@
#include "../platforms/cell/interrupt.h"
#include "cell/pr_util.h"
static void cell_global_stop_spu(void);
#define PPU_PROFILING 0
#define SPU_PROFILING_CYCLES 1
#define SPU_PROFILING_EVENTS 2
/*
* spu_cycle_reset is the number of cycles between samples.
* This variable is used for SPU profiling and should ONLY be set
* at the beginning of cell_reg_setup; otherwise, it's read-only.
*/
static unsigned int spu_cycle_reset;
#define SPU_EVENT_NUM_START 4100
#define SPU_EVENT_NUM_STOP 4399
#define SPU_PROFILE_EVENT_ADDR 4363 /* spu, address trace, decimal */
#define SPU_PROFILE_EVENT_ADDR_MASK_A 0x146 /* sub unit set to zero */
#define SPU_PROFILE_EVENT_ADDR_MASK_B 0x186 /* sub unit set to zero */
#define NUM_SPUS_PER_NODE 8
#define SPU_CYCLES_EVENT_NUM 2 /* event number for SPU_CYCLES */
@ -66,6 +67,21 @@ static unsigned int spu_cycle_reset;
#define MAX_SPU_COUNT 0xFFFFFF /* maximum 24 bit LFSR value */
/* Minumum HW interval timer setting to send value to trace buffer is 10 cycle.
* To configure counter to send value every N cycles set counter to
* 2^32 - 1 - N.
*/
#define NUM_INTERVAL_CYC 0xFFFFFFFF - 10
/*
* spu_cycle_reset is the number of cycles between samples.
* This variable is used for SPU profiling and should ONLY be set
* at the beginning of cell_reg_setup; otherwise, it's read-only.
*/
static unsigned int spu_cycle_reset;
static unsigned int profiling_mode;
static int spu_evnt_phys_spu_indx;
struct pmc_cntrl_data {
unsigned long vcntr;
unsigned long evnts;
@ -105,6 +121,8 @@ struct pm_cntrl {
u16 trace_mode;
u16 freeze;
u16 count_mode;
u16 spu_addr_trace;
u8 trace_buf_ovflw;
};
static struct {
@ -122,7 +140,7 @@ static struct {
#define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2)
static DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values);
static unsigned long spu_pm_cnt[MAX_NUMNODES * NUM_SPUS_PER_NODE];
static struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS];
/*
@ -152,6 +170,7 @@ static u32 hdw_thread;
static u32 virt_cntr_inter_mask;
static struct timer_list timer_virt_cntr;
static struct timer_list timer_spu_event_swap;
/*
* pm_signal needs to be global since it is initialized in
@ -165,7 +184,7 @@ static int spu_rtas_token; /* token for SPU cycle profiling */
static u32 reset_value[NR_PHYS_CTRS];
static int num_counters;
static int oprofile_running;
static DEFINE_SPINLOCK(virt_cntr_lock);
static DEFINE_SPINLOCK(cntr_lock);
static u32 ctr_enabled;
@ -336,13 +355,13 @@ static void set_pm_event(u32 ctr, int event, u32 unit_mask)
for (i = 0; i < NUM_DEBUG_BUS_WORDS; i++) {
if (bus_word & (1 << i)) {
pm_regs.debug_bus_control |=
(bus_type << (30 - (2 * i)));
(bus_type << (30 - (2 * i)));
for (j = 0; j < NUM_INPUT_BUS_WORDS; j++) {
if (input_bus[j] == 0xff) {
input_bus[j] = i;
pm_regs.group_control |=
(i << (30 - (2 * j)));
(i << (30 - (2 * j)));
break;
}
@ -367,12 +386,16 @@ static void write_pm_cntrl(int cpu)
if (pm_regs.pm_cntrl.stop_at_max == 1)
val |= CBE_PM_STOP_AT_MAX;
if (pm_regs.pm_cntrl.trace_mode == 1)
if (pm_regs.pm_cntrl.trace_mode != 0)
val |= CBE_PM_TRACE_MODE_SET(pm_regs.pm_cntrl.trace_mode);
if (pm_regs.pm_cntrl.trace_buf_ovflw == 1)
val |= CBE_PM_TRACE_BUF_OVFLW(pm_regs.pm_cntrl.trace_buf_ovflw);
if (pm_regs.pm_cntrl.freeze == 1)
val |= CBE_PM_FREEZE_ALL_CTRS;
val |= CBE_PM_SPU_ADDR_TRACE_SET(pm_regs.pm_cntrl.spu_addr_trace);
/*
* Routine set_count_mode must be called previously to set
* the count mode based on the user selection of user and kernel.
@ -441,7 +464,7 @@ static void cell_virtual_cntr(unsigned long data)
* not both playing with the counters on the same node.
*/
spin_lock_irqsave(&virt_cntr_lock, flags);
spin_lock_irqsave(&cntr_lock, flags);
prev_hdw_thread = hdw_thread;
@ -480,7 +503,7 @@ static void cell_virtual_cntr(unsigned long data)
cbe_disable_pm_interrupts(cpu);
for (i = 0; i < num_counters; i++) {
per_cpu(pmc_values, cpu + prev_hdw_thread)[i]
= cbe_read_ctr(cpu, i);
= cbe_read_ctr(cpu, i);
if (per_cpu(pmc_values, cpu + next_hdw_thread)[i]
== 0xFFFFFFFF)
@ -527,7 +550,7 @@ static void cell_virtual_cntr(unsigned long data)
cbe_enable_pm(cpu);
}
spin_unlock_irqrestore(&virt_cntr_lock, flags);
spin_unlock_irqrestore(&cntr_lock, flags);
mod_timer(&timer_virt_cntr, jiffies + HZ / 10);
}
@ -541,38 +564,146 @@ static void start_virt_cntrs(void)
add_timer(&timer_virt_cntr);
}
/* This function is called once for all cpus combined */
static int cell_reg_setup(struct op_counter_config *ctr,
static int cell_reg_setup_spu_cycles(struct op_counter_config *ctr,
struct op_system_config *sys, int num_ctrs)
{
int i, j, cpu;
spu_cycle_reset = 0;
if (ctr[0].event == SPU_CYCLES_EVENT_NUM) {
spu_cycle_reset = ctr[0].count;
/*
* Each node will need to make the rtas call to start
* and stop SPU profiling. Get the token once and store it.
*/
spu_rtas_token = rtas_token("ibm,cbe-spu-perftools");
if (unlikely(spu_rtas_token == RTAS_UNKNOWN_SERVICE)) {
printk(KERN_ERR
"%s: rtas token ibm,cbe-spu-perftools unknown\n",
__func__);
return -EIO;
}
}
pm_rtas_token = rtas_token("ibm,cbe-perftools");
spu_cycle_reset = ctr[0].count;
/*
* For all events excetp PPU CYCLEs, each node will need to make
* Each node will need to make the rtas call to start
* and stop SPU profiling. Get the token once and store it.
*/
spu_rtas_token = rtas_token("ibm,cbe-spu-perftools");
if (unlikely(spu_rtas_token == RTAS_UNKNOWN_SERVICE)) {
printk(KERN_ERR
"%s: rtas token ibm,cbe-spu-perftools unknown\n",
__func__);
return -EIO;
}
return 0;
}
/* Unfortunately, the hardware will only support event profiling
* on one SPU per node at a time. Therefore, we must time slice
* the profiling across all SPUs in the node. Note, we do this
* in parallel for each node. The following routine is called
* periodically based on kernel timer to switch which SPU is
* being monitored in a round robbin fashion.
*/
static void spu_evnt_swap(unsigned long data)
{
int node;
int cur_phys_spu, nxt_phys_spu, cur_spu_evnt_phys_spu_indx;
unsigned long flags;
int cpu;
int ret;
u32 interrupt_mask;
/* enable interrupts on cntr 0 */
interrupt_mask = CBE_PM_CTR_OVERFLOW_INTR(0);
hdw_thread = 0;
/* Make sure spu event interrupt handler and spu event swap
* don't access the counters simultaneously.
*/
spin_lock_irqsave(&cntr_lock, flags);
cur_spu_evnt_phys_spu_indx = spu_evnt_phys_spu_indx;
if (++(spu_evnt_phys_spu_indx) == NUM_SPUS_PER_NODE)
spu_evnt_phys_spu_indx = 0;
pm_signal[0].sub_unit = spu_evnt_phys_spu_indx;
pm_signal[1].sub_unit = spu_evnt_phys_spu_indx;
pm_signal[2].sub_unit = spu_evnt_phys_spu_indx;
/* switch the SPU being profiled on each node */
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
node = cbe_cpu_to_node(cpu);
cur_phys_spu = (node * NUM_SPUS_PER_NODE)
+ cur_spu_evnt_phys_spu_indx;
nxt_phys_spu = (node * NUM_SPUS_PER_NODE)
+ spu_evnt_phys_spu_indx;
/*
* stop counters, save counter values, restore counts
* for previous physical SPU
*/
cbe_disable_pm(cpu);
cbe_disable_pm_interrupts(cpu);
spu_pm_cnt[cur_phys_spu]
= cbe_read_ctr(cpu, 0);
/* restore previous count for the next spu to sample */
/* NOTE, hardware issue, counter will not start if the
* counter value is at max (0xFFFFFFFF).
*/
if (spu_pm_cnt[nxt_phys_spu] >= 0xFFFFFFFF)
cbe_write_ctr(cpu, 0, 0xFFFFFFF0);
else
cbe_write_ctr(cpu, 0, spu_pm_cnt[nxt_phys_spu]);
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
/* setup the debug bus measure the one event and
* the two events to route the next SPU's PC on
* the debug bus
*/
ret = pm_rtas_activate_signals(cbe_cpu_to_node(cpu), 3);
if (ret)
printk(KERN_ERR "%s: pm_rtas_activate_signals failed, "
"SPU event swap\n", __func__);
/* clear the trace buffer, don't want to take PC for
* previous SPU*/
cbe_write_pm(cpu, trace_address, 0);
enable_ctr(cpu, 0, pm_regs.pm07_cntrl);
/* Enable interrupts on the CPU thread that is starting */
cbe_enable_pm_interrupts(cpu, hdw_thread,
interrupt_mask);
cbe_enable_pm(cpu);
}
spin_unlock_irqrestore(&cntr_lock, flags);
/* swap approximately every 0.1 seconds */
mod_timer(&timer_spu_event_swap, jiffies + HZ / 25);
}
static void start_spu_event_swap(void)
{
init_timer(&timer_spu_event_swap);
timer_spu_event_swap.function = spu_evnt_swap;
timer_spu_event_swap.data = 0UL;
timer_spu_event_swap.expires = jiffies + HZ / 25;
add_timer(&timer_spu_event_swap);
}
static int cell_reg_setup_spu_events(struct op_counter_config *ctr,
struct op_system_config *sys, int num_ctrs)
{
int i;
/* routine is called once for all nodes */
spu_evnt_phys_spu_indx = 0;
/*
* For all events except PPU CYCLEs, each node will need to make
* the rtas cbe-perftools call to setup and reset the debug bus.
* Make the token lookup call once and store it in the global
* variable pm_rtas_token.
*/
pm_rtas_token = rtas_token("ibm,cbe-perftools");
if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) {
printk(KERN_ERR
"%s: rtas token ibm,cbe-perftools unknown\n",
@ -580,6 +711,58 @@ static int cell_reg_setup(struct op_counter_config *ctr,
return -EIO;
}
/* setup the pm_control register settings,
* settings will be written per node by the
* cell_cpu_setup() function.
*/
pm_regs.pm_cntrl.trace_buf_ovflw = 1;
/* Use the occurrence trace mode to have SPU PC saved
* to the trace buffer. Occurrence data in trace buffer
* is not used. Bit 2 must be set to store SPU addresses.
*/
pm_regs.pm_cntrl.trace_mode = 2;
pm_regs.pm_cntrl.spu_addr_trace = 0x1; /* using debug bus
event 2 & 3 */
/* setup the debug bus event array with the SPU PC routing events.
* Note, pm_signal[0] will be filled in by set_pm_event() call below.
*/
pm_signal[1].signal_group = SPU_PROFILE_EVENT_ADDR / 100;
pm_signal[1].bus_word = GET_BUS_WORD(SPU_PROFILE_EVENT_ADDR_MASK_A);
pm_signal[1].bit = SPU_PROFILE_EVENT_ADDR % 100;
pm_signal[1].sub_unit = spu_evnt_phys_spu_indx;
pm_signal[2].signal_group = SPU_PROFILE_EVENT_ADDR / 100;
pm_signal[2].bus_word = GET_BUS_WORD(SPU_PROFILE_EVENT_ADDR_MASK_B);
pm_signal[2].bit = SPU_PROFILE_EVENT_ADDR % 100;
pm_signal[2].sub_unit = spu_evnt_phys_spu_indx;
/* Set the user selected spu event to profile on,
* note, only one SPU profiling event is supported
*/
num_counters = 1; /* Only support one SPU event at a time */
set_pm_event(0, ctr[0].event, ctr[0].unit_mask);
reset_value[0] = 0xFFFFFFFF - ctr[0].count;
/* global, used by cell_cpu_setup */
ctr_enabled |= 1;
/* Initialize the count for each SPU to the reset value */
for (i=0; i < MAX_NUMNODES * NUM_SPUS_PER_NODE; i++)
spu_pm_cnt[i] = reset_value[0];
return 0;
}
static int cell_reg_setup_ppu(struct op_counter_config *ctr,
struct op_system_config *sys, int num_ctrs)
{
/* routine is called once for all nodes */
int i, j, cpu;
num_counters = num_ctrs;
if (unlikely(num_ctrs > NR_PHYS_CTRS)) {
@ -589,14 +772,6 @@ static int cell_reg_setup(struct op_counter_config *ctr,
__func__);
return -EIO;
}
pm_regs.group_control = 0;
pm_regs.debug_bus_control = 0;
/* setup the pm_control register */
memset(&pm_regs.pm_cntrl, 0, sizeof(struct pm_cntrl));
pm_regs.pm_cntrl.stop_at_max = 1;
pm_regs.pm_cntrl.trace_mode = 0;
pm_regs.pm_cntrl.freeze = 1;
set_count_mode(sys->enable_kernel, sys->enable_user);
@ -665,6 +840,63 @@ static int cell_reg_setup(struct op_counter_config *ctr,
}
/* This function is called once for all cpus combined */
static int cell_reg_setup(struct op_counter_config *ctr,
struct op_system_config *sys, int num_ctrs)
{
int ret=0;
spu_cycle_reset = 0;
/* initialize the spu_arr_trace value, will be reset if
* doing spu event profiling.
*/
pm_regs.group_control = 0;
pm_regs.debug_bus_control = 0;
pm_regs.pm_cntrl.stop_at_max = 1;
pm_regs.pm_cntrl.trace_mode = 0;
pm_regs.pm_cntrl.freeze = 1;
pm_regs.pm_cntrl.trace_buf_ovflw = 0;
pm_regs.pm_cntrl.spu_addr_trace = 0;
/*
* For all events except PPU CYCLEs, each node will need to make
* the rtas cbe-perftools call to setup and reset the debug bus.
* Make the token lookup call once and store it in the global
* variable pm_rtas_token.
*/
pm_rtas_token = rtas_token("ibm,cbe-perftools");
if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) {
printk(KERN_ERR
"%s: rtas token ibm,cbe-perftools unknown\n",
__func__);
return -EIO;
}
if (ctr[0].event == SPU_CYCLES_EVENT_NUM) {
profiling_mode = SPU_PROFILING_CYCLES;
ret = cell_reg_setup_spu_cycles(ctr, sys, num_ctrs);
} else if ((ctr[0].event >= SPU_EVENT_NUM_START) &&
(ctr[0].event <= SPU_EVENT_NUM_STOP)) {
profiling_mode = SPU_PROFILING_EVENTS;
spu_cycle_reset = ctr[0].count;
/* for SPU event profiling, need to setup the
* pm_signal array with the events to route the
* SPU PC before making the FW call. Note, only
* one SPU event for profiling can be specified
* at a time.
*/
cell_reg_setup_spu_events(ctr, sys, num_ctrs);
} else {
profiling_mode = PPU_PROFILING;
ret = cell_reg_setup_ppu(ctr, sys, num_ctrs);
}
return ret;
}
/* This function is called once for each cpu */
static int cell_cpu_setup(struct op_counter_config *cntr)
@ -672,8 +904,13 @@ static int cell_cpu_setup(struct op_counter_config *cntr)
u32 cpu = smp_processor_id();
u32 num_enabled = 0;
int i;
int ret;
if (spu_cycle_reset)
/* Cycle based SPU profiling does not use the performance
* counters. The trace array is configured to collect
* the data.
*/
if (profiling_mode == SPU_PROFILING_CYCLES)
return 0;
/* There is one performance monitor per processor chip (i.e. node),
@ -686,7 +923,6 @@ static int cell_cpu_setup(struct op_counter_config *cntr)
cbe_disable_pm(cpu);
cbe_disable_pm_interrupts(cpu);
cbe_write_pm(cpu, pm_interval, 0);
cbe_write_pm(cpu, pm_start_stop, 0);
cbe_write_pm(cpu, group_control, pm_regs.group_control);
cbe_write_pm(cpu, debug_bus_control, pm_regs.debug_bus_control);
@ -703,7 +939,20 @@ static int cell_cpu_setup(struct op_counter_config *cntr)
* The pm_rtas_activate_signals will return -EIO if the FW
* call failed.
*/
return pm_rtas_activate_signals(cbe_cpu_to_node(cpu), num_enabled);
if (profiling_mode == SPU_PROFILING_EVENTS) {
/* For SPU event profiling also need to setup the
* pm interval timer
*/
ret = pm_rtas_activate_signals(cbe_cpu_to_node(cpu),
num_enabled+2);
/* store PC from debug bus to Trace buffer as often
* as possible (every 10 cycles)
*/
cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC);
return ret;
} else
return pm_rtas_activate_signals(cbe_cpu_to_node(cpu),
num_enabled);
}
#define ENTRIES 303
@ -885,7 +1134,122 @@ static struct notifier_block cpu_freq_notifier_block = {
};
#endif
static int cell_global_start_spu(struct op_counter_config *ctr)
/*
* Note the generic OProfile stop calls do not support returning
* an error on stop. Hence, will not return an error if the FW
* calls fail on stop. Failure to reset the debug bus is not an issue.
* Failure to disable the SPU profiling is not an issue. The FW calls
* to enable the performance counters and debug bus will work even if
* the hardware was not cleanly reset.
*/
static void cell_global_stop_spu_cycles(void)
{
int subfunc, rtn_value;
unsigned int lfsr_value;
int cpu;
oprofile_running = 0;
smp_wmb();
#ifdef CONFIG_CPU_FREQ
cpufreq_unregister_notifier(&cpu_freq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
#endif
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
subfunc = 3; /*
* 2 - activate SPU tracing,
* 3 - deactivate
*/
lfsr_value = 0x8f100000;
rtn_value = rtas_call(spu_rtas_token, 3, 1, NULL,
subfunc, cbe_cpu_to_node(cpu),
lfsr_value);
if (unlikely(rtn_value != 0)) {
printk(KERN_ERR
"%s: rtas call ibm,cbe-spu-perftools " \
"failed, return = %d\n",
__func__, rtn_value);
}
/* Deactivate the signals */
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
}
stop_spu_profiling_cycles();
}
static void cell_global_stop_spu_events(void)
{
int cpu;
oprofile_running = 0;
stop_spu_profiling_events();
smp_wmb();
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
cbe_sync_irq(cbe_cpu_to_node(cpu));
/* Stop the counters */
cbe_disable_pm(cpu);
cbe_write_pm07_control(cpu, 0, 0);
/* Deactivate the signals */
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
/* Deactivate interrupts */
cbe_disable_pm_interrupts(cpu);
}
del_timer_sync(&timer_spu_event_swap);
}
static void cell_global_stop_ppu(void)
{
int cpu;
/*
* This routine will be called once for the system.
* There is one performance monitor per node, so we
* only need to perform this function once per node.
*/
del_timer_sync(&timer_virt_cntr);
oprofile_running = 0;
smp_wmb();
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
cbe_sync_irq(cbe_cpu_to_node(cpu));
/* Stop the counters */
cbe_disable_pm(cpu);
/* Deactivate the signals */
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
/* Deactivate interrupts */
cbe_disable_pm_interrupts(cpu);
}
}
static void cell_global_stop(void)
{
if (profiling_mode == PPU_PROFILING)
cell_global_stop_ppu();
else if (profiling_mode == SPU_PROFILING_EVENTS)
cell_global_stop_spu_events();
else
cell_global_stop_spu_cycles();
}
static int cell_global_start_spu_cycles(struct op_counter_config *ctr)
{
int subfunc;
unsigned int lfsr_value;
@ -951,18 +1315,18 @@ static int cell_global_start_spu(struct op_counter_config *ctr)
/* start profiling */
ret = rtas_call(spu_rtas_token, 3, 1, NULL, subfunc,
cbe_cpu_to_node(cpu), lfsr_value);
cbe_cpu_to_node(cpu), lfsr_value);
if (unlikely(ret != 0)) {
printk(KERN_ERR
"%s: rtas call ibm,cbe-spu-perftools failed, return = %d\n",
__func__, ret);
"%s: rtas call ibm,cbe-spu-perftools failed, " \
"return = %d\n", __func__, ret);
rtas_error = -EIO;
goto out;
}
}
rtas_error = start_spu_profiling(spu_cycle_reset);
rtas_error = start_spu_profiling_cycles(spu_cycle_reset);
if (rtas_error)
goto out_stop;
@ -970,11 +1334,74 @@ static int cell_global_start_spu(struct op_counter_config *ctr)
return 0;
out_stop:
cell_global_stop_spu(); /* clean up the PMU/debug bus */
cell_global_stop_spu_cycles(); /* clean up the PMU/debug bus */
out:
return rtas_error;
}
static int cell_global_start_spu_events(struct op_counter_config *ctr)
{
int cpu;
u32 interrupt_mask = 0;
int rtn = 0;
hdw_thread = 0;
/* spu event profiling, uses the performance counters to generate
* an interrupt. The hardware is setup to store the SPU program
* counter into the trace array. The occurrence mode is used to
* enable storing data to the trace buffer. The bits are set
* to send/store the SPU address in the trace buffer. The debug
* bus must be setup to route the SPU program counter onto the
* debug bus. The occurrence data in the trace buffer is not used.
*/
/* This routine gets called once for the system.
* There is one performance monitor per node, so we
* only need to perform this function once per node.
*/
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
/*
* Setup SPU event-based profiling.
* Set perf_mon_control bit 0 to a zero before
* enabling spu collection hardware.
*
* Only support one SPU event on one SPU per node.
*/
if (ctr_enabled & 1) {
cbe_write_ctr(cpu, 0, reset_value[0]);
enable_ctr(cpu, 0, pm_regs.pm07_cntrl);
interrupt_mask |=
CBE_PM_CTR_OVERFLOW_INTR(0);
} else {
/* Disable counter */
cbe_write_pm07_control(cpu, 0, 0);
}
cbe_get_and_clear_pm_interrupts(cpu);
cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask);
cbe_enable_pm(cpu);
/* clear the trace buffer */
cbe_write_pm(cpu, trace_address, 0);
}
/* Start the timer to time slice collecting the event profile
* on each of the SPUs. Note, can collect profile on one SPU
* per node at a time.
*/
start_spu_event_swap();
start_spu_profiling_events();
oprofile_running = 1;
smp_wmb();
return rtn;
}
static int cell_global_start_ppu(struct op_counter_config *ctr)
{
u32 cpu, i;
@ -994,8 +1421,7 @@ static int cell_global_start_ppu(struct op_counter_config *ctr)
if (ctr_enabled & (1 << i)) {
cbe_write_ctr(cpu, i, reset_value[i]);
enable_ctr(cpu, i, pm_regs.pm07_cntrl);
interrupt_mask |=
CBE_PM_CTR_OVERFLOW_INTR(i);
interrupt_mask |= CBE_PM_CTR_OVERFLOW_INTR(i);
} else {
/* Disable counter */
cbe_write_pm07_control(cpu, i, 0);
@ -1024,99 +1450,162 @@ static int cell_global_start_ppu(struct op_counter_config *ctr)
static int cell_global_start(struct op_counter_config *ctr)
{
if (spu_cycle_reset)
return cell_global_start_spu(ctr);
if (profiling_mode == SPU_PROFILING_CYCLES)
return cell_global_start_spu_cycles(ctr);
else if (profiling_mode == SPU_PROFILING_EVENTS)
return cell_global_start_spu_events(ctr);
else
return cell_global_start_ppu(ctr);
}
/*
* Note the generic OProfile stop calls do not support returning
* an error on stop. Hence, will not return an error if the FW
* calls fail on stop. Failure to reset the debug bus is not an issue.
* Failure to disable the SPU profiling is not an issue. The FW calls
* to enable the performance counters and debug bus will work even if
* the hardware was not cleanly reset.
/* The SPU interrupt handler
*
* SPU event profiling works as follows:
* The pm_signal[0] holds the one SPU event to be measured. It is routed on
* the debug bus using word 0 or 1. The value of pm_signal[1] and
* pm_signal[2] contain the necessary events to route the SPU program
* counter for the selected SPU onto the debug bus using words 2 and 3.
* The pm_interval register is setup to write the SPU PC value into the
* trace buffer at the maximum rate possible. The trace buffer is configured
* to store the PCs, wrapping when it is full. The performance counter is
* intialized to the max hardware count minus the number of events, N, between
* samples. Once the N events have occured, a HW counter overflow occurs
* causing the generation of a HW counter interrupt which also stops the
* writing of the SPU PC values to the trace buffer. Hence the last PC
* written to the trace buffer is the SPU PC that we want. Unfortunately,
* we have to read from the beginning of the trace buffer to get to the
* last value written. We just hope the PPU has nothing better to do then
* service this interrupt. The PC for the specific SPU being profiled is
* extracted from the trace buffer processed and stored. The trace buffer
* is cleared, interrupts are cleared, the counter is reset to max - N.
* A kernel timer is used to periodically call the routine spu_evnt_swap()
* to switch to the next physical SPU in the node to profile in round robbin
* order. This way data is collected for all SPUs on the node. It does mean
* that we need to use a relatively small value of N to ensure enough samples
* on each SPU are collected each SPU is being profiled 1/8 of the time.
* It may also be necessary to use a longer sample collection period.
*/
static void cell_global_stop_spu(void)
static void cell_handle_interrupt_spu(struct pt_regs *regs,
struct op_counter_config *ctr)
{
int subfunc, rtn_value;
unsigned int lfsr_value;
int cpu;
u32 cpu, cpu_tmp;
u64 trace_entry;
u32 interrupt_mask;
u64 trace_buffer[2];
u64 last_trace_buffer;
u32 sample;
u32 trace_addr;
unsigned long sample_array_lock_flags;
int spu_num;
unsigned long flags;
oprofile_running = 0;
/* Make sure spu event interrupt handler and spu event swap
* don't access the counters simultaneously.
*/
cpu = smp_processor_id();
spin_lock_irqsave(&cntr_lock, flags);
#ifdef CONFIG_CPU_FREQ
cpufreq_unregister_notifier(&cpu_freq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
#endif
cpu_tmp = cpu;
cbe_disable_pm(cpu);
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu);
subfunc = 3; /*
* 2 - activate SPU tracing,
* 3 - deactivate
*/
lfsr_value = 0x8f100000;
sample = 0xABCDEF;
trace_entry = 0xfedcba;
last_trace_buffer = 0xdeadbeaf;
rtn_value = rtas_call(spu_rtas_token, 3, 1, NULL,
subfunc, cbe_cpu_to_node(cpu),
lfsr_value);
if ((oprofile_running == 1) && (interrupt_mask != 0)) {
/* disable writes to trace buff */
cbe_write_pm(cpu, pm_interval, 0);
if (unlikely(rtn_value != 0)) {
printk(KERN_ERR
"%s: rtas call ibm,cbe-spu-perftools failed, return = %d\n",
__func__, rtn_value);
/* only have one perf cntr being used, cntr 0 */
if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(0))
&& ctr[0].enabled)
/* The SPU PC values will be read
* from the trace buffer, reset counter
*/
cbe_write_ctr(cpu, 0, reset_value[0]);
trace_addr = cbe_read_pm(cpu, trace_address);
while (!(trace_addr & CBE_PM_TRACE_BUF_EMPTY)) {
/* There is data in the trace buffer to process
* Read the buffer until you get to the last
* entry. This is the value we want.
*/
cbe_read_trace_buffer(cpu, trace_buffer);
trace_addr = cbe_read_pm(cpu, trace_address);
}
/* Deactivate the signals */
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
/* SPU Address 16 bit count format for 128 bit
* HW trace buffer is used for the SPU PC storage
* HDR bits 0:15
* SPU Addr 0 bits 16:31
* SPU Addr 1 bits 32:47
* unused bits 48:127
*
* HDR: bit4 = 1 SPU Address 0 valid
* HDR: bit5 = 1 SPU Address 1 valid
* - unfortunately, the valid bits don't seem to work
*
* Note trace_buffer[0] holds bits 0:63 of the HW
* trace buffer, trace_buffer[1] holds bits 64:127
*/
trace_entry = trace_buffer[0]
& 0x00000000FFFF0000;
/* only top 16 of the 18 bit SPU PC address
* is stored in trace buffer, hence shift right
* by 16 -2 bits */
sample = trace_entry >> 14;
last_trace_buffer = trace_buffer[0];
spu_num = spu_evnt_phys_spu_indx
+ (cbe_cpu_to_node(cpu) * NUM_SPUS_PER_NODE);
/* make sure only one process at a time is calling
* spu_sync_buffer()
*/
spin_lock_irqsave(&oprof_spu_smpl_arry_lck,
sample_array_lock_flags);
spu_sync_buffer(spu_num, &sample, 1);
spin_unlock_irqrestore(&oprof_spu_smpl_arry_lck,
sample_array_lock_flags);
smp_wmb(); /* insure spu event buffer updates are written
* don't want events intermingled... */
/* The counters were frozen by the interrupt.
* Reenable the interrupt and restart the counters.
*/
cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC);
cbe_enable_pm_interrupts(cpu, hdw_thread,
virt_cntr_inter_mask);
/* clear the trace buffer, re-enable writes to trace buff */
cbe_write_pm(cpu, trace_address, 0);
cbe_write_pm(cpu, pm_interval, NUM_INTERVAL_CYC);
/* The writes to the various performance counters only writes
* to a latch. The new values (interrupt setting bits, reset
* counter value etc.) are not copied to the actual registers
* until the performance monitor is enabled. In order to get
* this to work as desired, the permormance monitor needs to
* be disabled while writing to the latches. This is a
* HW design issue.
*/
write_pm_cntrl(cpu);
cbe_enable_pm(cpu);
}
stop_spu_profiling();
spin_unlock_irqrestore(&cntr_lock, flags);
}
static void cell_global_stop_ppu(void)
{
int cpu;
/*
* This routine will be called once for the system.
* There is one performance monitor per node, so we
* only need to perform this function once per node.
*/
del_timer_sync(&timer_virt_cntr);
oprofile_running = 0;
smp_wmb();
for_each_online_cpu(cpu) {
if (cbe_get_hw_thread_id(cpu))
continue;
cbe_sync_irq(cbe_cpu_to_node(cpu));
/* Stop the counters */
cbe_disable_pm(cpu);
/* Deactivate the signals */
pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
/* Deactivate interrupts */
cbe_disable_pm_interrupts(cpu);
}
}
static void cell_global_stop(void)
{
if (spu_cycle_reset)
cell_global_stop_spu();
else
cell_global_stop_ppu();
}
static void cell_handle_interrupt(struct pt_regs *regs,
struct op_counter_config *ctr)
static void cell_handle_interrupt_ppu(struct pt_regs *regs,
struct op_counter_config *ctr)
{
u32 cpu;
u64 pc;
@ -1132,7 +1621,7 @@ static void cell_handle_interrupt(struct pt_regs *regs,
* routine are not running at the same time. See the
* cell_virtual_cntr() routine for additional comments.
*/
spin_lock_irqsave(&virt_cntr_lock, flags);
spin_lock_irqsave(&cntr_lock, flags);
/*
* Need to disable and reenable the performance counters
@ -1185,7 +1674,16 @@ static void cell_handle_interrupt(struct pt_regs *regs,
*/
cbe_enable_pm(cpu);
}
spin_unlock_irqrestore(&virt_cntr_lock, flags);
spin_unlock_irqrestore(&cntr_lock, flags);
}
static void cell_handle_interrupt(struct pt_regs *regs,
struct op_counter_config *ctr)
{
if (profiling_mode == PPU_PROFILING)
cell_handle_interrupt_ppu(regs, ctr);
else
cell_handle_interrupt_spu(regs, ctr);
}
/*
@ -1195,7 +1693,8 @@ static void cell_handle_interrupt(struct pt_regs *regs,
*/
static int cell_sync_start(void)
{
if (spu_cycle_reset)
if ((profiling_mode == SPU_PROFILING_CYCLES) ||
(profiling_mode == SPU_PROFILING_EVENTS))
return spu_sync_start();
else
return DO_GENERIC_SYNC;
@ -1203,7 +1702,8 @@ static int cell_sync_start(void)
static int cell_sync_stop(void)
{
if (spu_cycle_reset)
if ((profiling_mode == SPU_PROFILING_CYCLES) ||
(profiling_mode == SPU_PROFILING_EVENTS))
return spu_sync_stop();
else
return 1;