6 files changed, 545 insertions, 16 deletions

diff --git a/arch/powerpc/include/asm/cell-pmu.h b/arch/powerpc/include/asm/cell-pmu.h
index 8066eede3a0c..b4b7338ad79e 100644
--- a/arch/powerpc/include/asm/cell-pmu.h
+++ b/arch/powerpc/include/asm/cell-pmu.h
@@ -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
diff --git a/arch/powerpc/include/asm/oprofile_impl.h b/arch/powerpc/include/asm/oprofile_impl.h
index 95035c602ba6..639dc96077ab 100644
--- a/arch/powerpc/include/asm/oprofile_impl.h
+++ b/arch/powerpc/include/asm/oprofile_impl.h
@@ -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;
diff --git a/arch/powerpc/oprofile/cell/pr_util.h b/arch/powerpc/oprofile/cell/pr_util.h
index bca7207bd92a..a048b0b72be3 100644
--- a/arch/powerpc/oprofile/cell/pr_util.h
+++ b/arch/powerpc/oprofile/cell/pr_util.h
@@ -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 */
@@ -90,9 +94,10 @@ void vma_map_free(struct vma_to_fileoffset_map *map);
  * cycles_reset is the SPU_CYCLES count value specified by the user.
  */
 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);
diff --git a/arch/powerpc/oprofile/cell/spu_profiler.c b/arch/powerpc/oprofile/cell/spu_profiler.c
index 8b1b9ccaff9f..de170b7ae71b 100644
--- a/arch/powerpc/oprofile/cell/spu_profiler.c
+++ b/arch/powerpc/oprofile/cell/spu_profiler.c
@@ -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;
 
@@ -31,7 +41,7 @@ static unsigned int profiling_interval;
 
 #define SPU_PC_MASK          0xFFFF
 
-static DEFINE_SPINLOCK(oprof_spu_smpl_arry_lck);
+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)
@@ -212,6 +222,21 @@ int start_spu_profiling_cycles(unsigned int cycles_reset)
         return 0;
 }
 
+/*
+ * 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;
@@ -219,3 +244,8 @@ void stop_spu_profiling_cycles(void)
         kfree(samples);
         pr_debug("SPU_PROF: stop_spu_profiling_cycles issued\n");
 }
+
+void stop_spu_profiling_events(void)
+{
+        spu_prof_running = 0;
+}
diff --git a/arch/powerpc/oprofile/common.c b/arch/powerpc/oprofile/common.c
index 17807acb05d9..21f16edf6c8d 100644
--- a/arch/powerpc/oprofile/common.c
+++ b/arch/powerpc/oprofile/common.c
@@ -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) {
diff --git a/arch/powerpc/oprofile/op_model_cell.c b/arch/powerpc/oprofile/op_model_cell.c
index ad7f32c848f8..ff96cbfb89bb 100644
--- a/arch/powerpc/oprofile/op_model_cell.c
+++ b/arch/powerpc/oprofile/op_model_cell.c
@@ -44,6 +44,12 @@
 #define SPU_PROFILING_CYCLES     1
 #define SPU_PROFILING_EVENTS     2
 
+#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 */
 
@@ -61,6 +67,12 @@
 
 #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
@@ -68,6 +80,7 @@
  */
 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;
@@ -108,6 +121,8 @@ struct pm_cntrl {
         u16 trace_mode;
         u16 freeze;
         u16 count_mode;
+        u16 spu_addr_trace;
+        u8  trace_buf_ovflw;
 };
 
 static struct {
@@ -125,6 +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];
 
 /*
@@ -154,6 +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
@@ -372,9 +389,13 @@ static void write_pm_cntrl(int cpu)
         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.
@@ -563,9 +584,184 @@ static int cell_reg_setup_spu_cycles(struct op_counter_config *ctr,
         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",
+                       __func__);
+                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;
@@ -577,14 +773,6 @@ static int cell_reg_setup_ppu(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);
 
@@ -657,10 +845,20 @@ static int cell_reg_setup_ppu(struct op_counter_config *ctr,
 static int cell_reg_setup(struct op_counter_config *ctr,
                         struct op_system_config *sys, int num_ctrs)
 {
-        int ret;
-
+        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.
@@ -679,6 +877,18 @@ static int cell_reg_setup(struct op_counter_config *ctr,
         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);
@@ -695,6 +905,7 @@ static int cell_cpu_setup(struct op_counter_config *cntr)
         u32 cpu = smp_processor_id();
         u32 num_enabled = 0;
         int i;
+        int ret;
 
         /* Cycle based SPU profiling does not use the performance
          * counters.  The trace array is configured to collect
@@ -729,7 +940,20 @@ 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
@@ -926,6 +1150,7 @@ static void cell_global_stop_spu_cycles(void)
         int cpu;
 
         oprofile_running = 0;
+        smp_wmb();
 
 #ifdef CONFIG_CPU_FREQ
         cpufreq_unregister_notifier(&cpu_freq_notifier_block,
@@ -957,8 +1182,33 @@ static void cell_global_stop_spu_cycles(void)
                 pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
         }
 
-        if (profiling_mode == SPU_PROFILING_CYCLES)
-                stop_spu_profiling_cycles();
+        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)
@@ -994,6 +1244,8 @@ 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();
 }
@@ -1088,6 +1340,69 @@ 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;
@@ -1139,11 +1454,158 @@ static int cell_global_start(struct op_counter_config *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);
 }
 
 
+/* 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_handle_interrupt_spu(struct pt_regs *regs,
+                                      struct op_counter_config *ctr)
+{
+        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;
+
+        /* 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);
+
+        cpu_tmp = cpu;
+        cbe_disable_pm(cpu);
+
+        interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu);
+
+        sample = 0xABCDEF;
+        trace_entry = 0xfedcba;
+        last_trace_buffer = 0xdeadbeaf;
+
+        if ((oprofile_running == 1) && (interrupt_mask != 0)) {
+                /* disable writes to trace buff */
+                cbe_write_pm(cpu, pm_interval, 0);
+
+                /* 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);
+                }
+
+                /* 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);
+        }
+        spin_unlock_irqrestore(&cntr_lock, flags);
+}
+
 static void cell_handle_interrupt_ppu(struct pt_regs *regs,
                                       struct op_counter_config *ctr)
 {
@@ -1222,6 +1684,8 @@ static void cell_handle_interrupt(struct pt_regs *regs,
 {
         if (profiling_mode == PPU_PROFILING)
                 cell_handle_interrupt_ppu(regs, ctr);
+        else
+                cell_handle_interrupt_spu(regs, ctr);
 }
 
 /*