[POWERPC] PS3: Add logical performance monitor driver support

Add PS3 logical performance monitor (lpm) device driver.

The PS3's LV1 hypervisor provides a Logical Performance Monitor that
abstracts the Cell processor's performance monitor features for use
by guest operating systems.

Signed-off-by: Takashi Yamamoto <TakashiA.Yamamoto@jp.sony.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 1249 insertions, 0 deletions

diff --git a/drivers/ps3/Makefile b/drivers/ps3/Makefile
index 1f5a2d33bf5b..ccea15c11c19 100644
--- a/drivers/ps3/Makefile
+++ b/drivers/ps3/Makefile
@@ -4,3 +4,4 @@ ps3av_mod-objs		+= ps3av.o ps3av_cmd.o
 obj-$(CONFIG_PPC_PS3) += sys-manager-core.o
 obj-$(CONFIG_PS3_SYS_MANAGER) += ps3-sys-manager.o
 obj-$(CONFIG_PS3_STORAGE) += ps3stor_lib.o
+obj-$(CONFIG_PS3_LPM) += ps3-lpm.o
diff --git a/drivers/ps3/ps3-lpm.c b/drivers/ps3/ps3-lpm.c
new file mode 100644
index 000000000000..4c066545d176
--- /dev/null
+++ b/drivers/ps3/ps3-lpm.c
@@ -0,0 +1,1248 @@
+/*
+ * PS3 Logical Performance Monitor.
+ *
+ *  Copyright (C) 2007 Sony Computer Entertainment Inc.
+ *  Copyright 2007 Sony Corp.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/uaccess.h>
+#include <asm/ps3.h>
+#include <asm/lv1call.h>
+#include <asm/cell-pmu.h>
+
+
+/* BOOKMARK tag macros */
+#define PS3_PM_BOOKMARK_START                    0x8000000000000000ULL
+#define PS3_PM_BOOKMARK_STOP                     0x4000000000000000ULL
+#define PS3_PM_BOOKMARK_TAG_KERNEL               0x1000000000000000ULL
+#define PS3_PM_BOOKMARK_TAG_USER                 0x3000000000000000ULL
+#define PS3_PM_BOOKMARK_TAG_MASK_HI              0xF000000000000000ULL
+#define PS3_PM_BOOKMARK_TAG_MASK_LO              0x0F00000000000000ULL
+
+/* CBE PM CONTROL register macros */
+#define PS3_PM_CONTROL_PPU_TH0_BOOKMARK          0x00001000
+#define PS3_PM_CONTROL_PPU_TH1_BOOKMARK          0x00000800
+#define PS3_PM_CONTROL_PPU_COUNT_MODE_MASK       0x000C0000
+#define PS3_PM_CONTROL_PPU_COUNT_MODE_PROBLEM    0x00080000
+#define PS3_WRITE_PM_MASK                        0xFFFFFFFFFFFFFFFFULL
+
+/* CBE PM START STOP register macros */
+#define PS3_PM_START_STOP_PPU_TH0_BOOKMARK_START 0x02000000
+#define PS3_PM_START_STOP_PPU_TH1_BOOKMARK_START 0x01000000
+#define PS3_PM_START_STOP_PPU_TH0_BOOKMARK_STOP  0x00020000
+#define PS3_PM_START_STOP_PPU_TH1_BOOKMARK_STOP  0x00010000
+#define PS3_PM_START_STOP_START_MASK             0xFF000000
+#define PS3_PM_START_STOP_STOP_MASK              0x00FF0000
+
+/* CBE PM COUNTER register macres */
+#define PS3_PM_COUNTER_MASK_HI                   0xFFFFFFFF00000000ULL
+#define PS3_PM_COUNTER_MASK_LO                   0x00000000FFFFFFFFULL
+
+/* BASE SIGNAL GROUP NUMBER macros */
+#define PM_ISLAND2_BASE_SIGNAL_GROUP_NUMBER  0
+#define PM_ISLAND2_SIGNAL_GROUP_NUMBER1      6
+#define PM_ISLAND2_SIGNAL_GROUP_NUMBER2      7
+#define PM_ISLAND3_BASE_SIGNAL_GROUP_NUMBER  7
+#define PM_ISLAND4_BASE_SIGNAL_GROUP_NUMBER  15
+#define PM_SPU_TRIGGER_SIGNAL_GROUP_NUMBER   17
+#define PM_SPU_EVENT_SIGNAL_GROUP_NUMBER     18
+#define PM_ISLAND5_BASE_SIGNAL_GROUP_NUMBER  18
+#define PM_ISLAND6_BASE_SIGNAL_GROUP_NUMBER  24
+#define PM_ISLAND7_BASE_SIGNAL_GROUP_NUMBER  49
+#define PM_ISLAND8_BASE_SIGNAL_GROUP_NUMBER  52
+#define PM_SIG_GROUP_SPU                     41
+#define PM_SIG_GROUP_SPU_TRIGGER             42
+#define PM_SIG_GROUP_SPU_EVENT               43
+#define PM_SIG_GROUP_MFC_MAX                 60
+
+/**
+ * struct ps3_lpm_shadow_regs - Performance monitor shadow registers.
+ *
+ * @pm_control: Shadow of the processor's pm_control register.
+ * @pm_start_stop: Shadow of the processor's pm_start_stop register.
+ * @pm_interval: Shadow of the processor's pm_interval register.
+ * @group_control: Shadow of the processor's group_control register.
+ * @debug_bus_control: Shadow of the processor's debug_bus_control register.
+ *
+ * The logical performance monitor provides a write-only interface to
+ * these processor registers.  These shadow variables cache the processor
+ * register values for reading.
+ *
+ * The initial value of the shadow registers at lpm creation is
+ * PS3_LPM_SHADOW_REG_INIT.
+ */
+
+struct ps3_lpm_shadow_regs {
+        u64 pm_control;
+        u64 pm_start_stop;
+        u64 pm_interval;
+        u64 group_control;
+        u64 debug_bus_control;
+};
+
+#define PS3_LPM_SHADOW_REG_INIT 0xFFFFFFFF00000000ULL
+
+/**
+ * struct ps3_lpm_priv - Private lpm device data.
+ *
+ * @open: An atomic variable indicating the lpm driver has been opened.
+ * @rights: The lpm rigths granted by the system policy module.  A logical
+ *  OR of enum ps3_lpm_rights.
+ * @node_id: The node id of a BE prosessor whose performance monitor this
+ *  lpar has the right to use.
+ * @pu_id: The lv1 id of the logical PU.
+ * @lpm_id: The lv1 id of this lpm instance.
+ * @outlet_id: The outlet created by lv1 for this lpm instance.
+ * @tb_count: The number of bytes of data held in the lv1 trace buffer.
+ * @tb_cache: Kernel buffer to receive the data from the lv1 trace buffer.
+ *  Must be 128 byte aligned.
+ * @tb_cache_size: Size of the kernel @tb_cache buffer.  Must be 128 byte
+ *  aligned.
+ * @tb_cache_internal: An unaligned buffer allocated by this driver to be
+ *  used for the trace buffer cache when ps3_lpm_open() is called with a
+ *  NULL tb_cache argument.  Otherwise unused.
+ * @shadow: Processor register shadow of type struct ps3_lpm_shadow_regs.
+ * @sbd: The struct ps3_system_bus_device attached to this driver.
+ *
+ * The trace buffer is a buffer allocated and used internally to the lv1
+ * hypervisor to collect trace data.  The trace buffer cache is a guest
+ * buffer that accepts the trace data from the trace buffer.
+ */
+
+struct ps3_lpm_priv {
+        atomic_t open;
+        u64 rights;
+        u64 node_id;
+        u64 pu_id;
+        u64 lpm_id;
+        u64 outlet_id;
+        u64 tb_count;
+        void *tb_cache;
+        u64 tb_cache_size;
+        void *tb_cache_internal;
+        struct ps3_lpm_shadow_regs shadow;
+        struct ps3_system_bus_device *sbd;
+};
+
+enum {
+        PS3_LPM_DEFAULT_TB_CACHE_SIZE = 0x4000,
+};
+
+/**
+ * lpm_priv - Static instance of the lpm data.
+ *
+ * Since the exported routines don't support the notion of a device
+ * instance we need to hold the instance in this static variable
+ * and then only allow at most one instance at a time to be created.
+ */
+
+static struct ps3_lpm_priv *lpm_priv;
+
+static struct device *sbd_core(void)
+{
+        BUG_ON(!lpm_priv || !lpm_priv->sbd);
+        return &lpm_priv->sbd->core;
+}
+
+/**
+ * use_start_stop_bookmark - Enable the PPU bookmark trace.
+ *
+ * And it enables PPU bookmark triggers ONLY if the other triggers are not set.
+ * The start/stop bookmarks are inserted at ps3_enable_pm() and ps3_disable_pm()
+ * to start/stop LPM.
+ *
+ * Used to get good quality of the performance counter.
+ */
+
+enum {use_start_stop_bookmark = 1,};
+
+void ps3_set_bookmark(u64 bookmark)
+{
+        /*
+         * As per the PPE book IV, to avoid bookmark loss there must
+         * not be a traced branch within 10 cycles of setting the
+         * SPRN_BKMK register.  The actual text is unclear if 'within'
+         * includes cycles before the call.
+         */
+
+        asm volatile("or 29, 29, 29;"); /* db10cyc */
+        mtspr(SPRN_BKMK, bookmark);
+        asm volatile("or 29, 29, 29;"); /* db10cyc */
+}
+EXPORT_SYMBOL_GPL(ps3_set_bookmark);
+
+void ps3_set_pm_bookmark(u64 tag, u64 incident, u64 th_id)
+{
+        u64 bookmark;
+
+        bookmark = (get_tb() & 0x00000000FFFFFFFFULL) |
+                PS3_PM_BOOKMARK_TAG_KERNEL;
+        bookmark = ((tag << 56) & PS3_PM_BOOKMARK_TAG_MASK_LO) |
+                (incident << 48) | (th_id << 32) | bookmark;
+        ps3_set_bookmark(bookmark);
+}
+EXPORT_SYMBOL_GPL(ps3_set_pm_bookmark);
+
+/**
+ * ps3_read_phys_ctr - Read physical counter registers.
+ *
+ * Each physical counter can act as one 32 bit counter or as two 16 bit
+ * counters.
+ */
+
+u32 ps3_read_phys_ctr(u32 cpu, u32 phys_ctr)
+{
+        int result;
+        u64 counter0415;
+        u64 counter2637;
+
+        if (phys_ctr >= NR_PHYS_CTRS) {
+                dev_dbg(sbd_core(), "%s:%u: phys_ctr too big: %u\n", __func__,
+                        __LINE__, phys_ctr);
+                return 0;
+        }
+
+        result = lv1_set_lpm_counter(lpm_priv->lpm_id, 0, 0, 0, 0, &counter0415,
+                                     &counter2637);
+        if (result) {
+                dev_err(sbd_core(), "%s:%u: lv1_set_lpm_counter failed: "
+                        "phys_ctr %u, %s\n", __func__, __LINE__, phys_ctr,
+                        ps3_result(result));
+                return 0;
+        }
+
+        switch (phys_ctr) {
+        case 0:
+                return counter0415 >> 32;
+        case 1:
+                return counter0415 & PS3_PM_COUNTER_MASK_LO;
+        case 2:
+                return counter2637 >> 32;
+        case 3:
+                return counter2637 & PS3_PM_COUNTER_MASK_LO;
+        default:
+                BUG();
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ps3_read_phys_ctr);
+
+/**
+ * ps3_write_phys_ctr - Write physical counter registers.
+ *
+ * Each physical counter can act as one 32 bit counter or as two 16 bit
+ * counters.
+ */
+
+void ps3_write_phys_ctr(u32 cpu, u32 phys_ctr, u32 val)
+{
+        u64 counter0415;
+        u64 counter0415_mask;
+        u64 counter2637;
+        u64 counter2637_mask;
+        int result;
+
+        if (phys_ctr >= NR_PHYS_CTRS) {
+                dev_dbg(sbd_core(), "%s:%u: phys_ctr too big: %u\n", __func__,
+                        __LINE__, phys_ctr);
+                return;
+        }
+
+        switch (phys_ctr) {
+        case 0:
+                counter0415 = (u64)val << 32;
+                counter0415_mask = PS3_PM_COUNTER_MASK_HI;
+                counter2637 = 0x0;
+                counter2637_mask = 0x0;
+                break;
+        case 1:
+                counter0415 = (u64)val;
+                counter0415_mask = PS3_PM_COUNTER_MASK_LO;
+                counter2637 = 0x0;
+                counter2637_mask = 0x0;
+                break;
+        case 2:
+                counter0415 = 0x0;
+                counter0415_mask = 0x0;
+                counter2637 = (u64)val << 32;
+                counter2637_mask = PS3_PM_COUNTER_MASK_HI;
+                break;
+        case 3:
+                counter0415 = 0x0;
+                counter0415_mask = 0x0;
+                counter2637 = (u64)val;
+                counter2637_mask = PS3_PM_COUNTER_MASK_LO;
+                break;
+        default:
+                BUG();
+        }
+
+        result = lv1_set_lpm_counter(lpm_priv->lpm_id,
+                                     counter0415, counter0415_mask,
+                                     counter2637, counter2637_mask,
+                                     &counter0415, &counter2637);
+        if (result)
+                dev_err(sbd_core(), "%s:%u: lv1_set_lpm_counter failed: "
+                        "phys_ctr %u, val %u, %s\n", __func__, __LINE__,
+                        phys_ctr, val, ps3_result(result));
+}
+EXPORT_SYMBOL_GPL(ps3_write_phys_ctr);
+
+/**
+ * ps3_read_ctr - Read counter.
+ *
+ * Read 16 or 32 bits depending on the current size of the counter.
+ * Counters 4, 5, 6 & 7 are always 16 bit.
+ */
+
+u32 ps3_read_ctr(u32 cpu, u32 ctr)
+{
+        u32 val;
+        u32 phys_ctr = ctr & (NR_PHYS_CTRS - 1);
+
+        val = ps3_read_phys_ctr(cpu, phys_ctr);
+
+        if (ps3_get_ctr_size(cpu, phys_ctr) == 16)
+                val = (ctr < NR_PHYS_CTRS) ? (val >> 16) : (val & 0xffff);
+
+        return val;
+}
+EXPORT_SYMBOL_GPL(ps3_read_ctr);
+
+/**
+ * ps3_write_ctr - Write counter.
+ *
+ * Write 16 or 32 bits depending on the current size of the counter.
+ * Counters 4, 5, 6 & 7 are always 16 bit.
+ */
+
+void ps3_write_ctr(u32 cpu, u32 ctr, u32 val)
+{
+        u32 phys_ctr;
+        u32 phys_val;
+
+        phys_ctr = ctr & (NR_PHYS_CTRS - 1);
+
+        if (ps3_get_ctr_size(cpu, phys_ctr) == 16) {
+                phys_val = ps3_read_phys_ctr(cpu, phys_ctr);
+
+                if (ctr < NR_PHYS_CTRS)
+                        val = (val << 16) | (phys_val & 0xffff);
+                else
+                        val = (val & 0xffff) | (phys_val & 0xffff0000);
+        }
+
+        ps3_write_phys_ctr(cpu, phys_ctr, val);
+}
+EXPORT_SYMBOL_GPL(ps3_write_ctr);
+
+/**
+ * ps3_read_pm07_control - Read counter control registers.
+ *
+ * Each logical counter has a corresponding control register.
+ */
+
+u32 ps3_read_pm07_control(u32 cpu, u32 ctr)
+{
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ps3_read_pm07_control);
+
+/**
+ * ps3_write_pm07_control - Write counter control registers.
+ *
+ * Each logical counter has a corresponding control register.
+ */
+
+void ps3_write_pm07_control(u32 cpu, u32 ctr, u32 val)
+{
+        int result;
+        static const u64 mask = 0xFFFFFFFFFFFFFFFFULL;
+        u64 old_value;
+
+        if (ctr >= NR_CTRS) {
+                dev_dbg(sbd_core(), "%s:%u: ctr too big: %u\n", __func__,
+                        __LINE__, ctr);
+                return;
+        }
+
+        result = lv1_set_lpm_counter_control(lpm_priv->lpm_id, ctr, val, mask,
+                                             &old_value);
+        if (result)
+                dev_err(sbd_core(), "%s:%u: lv1_set_lpm_counter_control "
+                        "failed: ctr %u, %s\n", __func__, __LINE__, ctr,
+                        ps3_result(result));
+}
+EXPORT_SYMBOL_GPL(ps3_write_pm07_control);
+
+/**
+ * ps3_read_pm - Read Other LPM control registers.
+ */
+
+u32 ps3_read_pm(u32 cpu, enum pm_reg_name reg)
+{
+        int result = 0;
+        u64 val = 0;
+
+        switch (reg) {
+        case pm_control:
+                return lpm_priv->shadow.pm_control;
+        case trace_address:
+                return CBE_PM_TRACE_BUF_EMPTY;
+        case pm_start_stop:
+                return lpm_priv->shadow.pm_start_stop;
+        case pm_interval:
+                return lpm_priv->shadow.pm_interval;
+        case group_control:
+                return lpm_priv->shadow.group_control;
+        case debug_bus_control:
+                return lpm_priv->shadow.debug_bus_control;
+        case pm_status:
+                result = lv1_get_lpm_interrupt_status(lpm_priv->lpm_id,
+                                                      &val);
+                if (result) {
+                        val = 0;
+                        dev_dbg(sbd_core(), "%s:%u: lv1 get_lpm_status failed: "
+                                "reg %u, %s\n", __func__, __LINE__, reg,
+                                ps3_result(result));
+                }
+                return (u32)val;
+        case ext_tr_timer:
+                return 0;
+        default:
+                dev_dbg(sbd_core(), "%s:%u: unknown reg: %d\n", __func__,
+                        __LINE__, reg);
+                BUG();
+                break;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ps3_read_pm);
+
+/**
+ * ps3_write_pm - Write Other LPM control registers.
+ */
+
+void ps3_write_pm(u32 cpu, enum pm_reg_name reg, u32 val)
+{
+        int result = 0;
+        u64 dummy;
+
+        switch (reg) {
+        case group_control:
+                if (val != lpm_priv->shadow.group_control)
+                        result = lv1_set_lpm_group_control(lpm_priv->lpm_id,
+                                                           val,
+                                                           PS3_WRITE_PM_MASK,
+                                                           &dummy);
+                lpm_priv->shadow.group_control = val;
+                break;
+        case debug_bus_control:
+                if (val != lpm_priv->shadow.debug_bus_control)
+                        result = lv1_set_lpm_debug_bus_control(lpm_priv->lpm_id,
+                                                              val,
+                                                              PS3_WRITE_PM_MASK,
+                                                              &dummy);
+                lpm_priv->shadow.debug_bus_control = val;
+                break;
+        case pm_control:
+                if (use_start_stop_bookmark)
+                        val |= (PS3_PM_CONTROL_PPU_TH0_BOOKMARK |
+                                PS3_PM_CONTROL_PPU_TH1_BOOKMARK);
+                if (val != lpm_priv->shadow.pm_control)
+                        result = lv1_set_lpm_general_control(lpm_priv->lpm_id,
+                                                             val,
+                                                             PS3_WRITE_PM_MASK,
+                                                             0, 0, &dummy,
+                                                             &dummy);
+                lpm_priv->shadow.pm_control = val;
+                break;
+        case pm_interval:
+                if (val != lpm_priv->shadow.pm_interval)
+                        result = lv1_set_lpm_interval(lpm_priv->lpm_id, val,
+                                                   PS3_WRITE_PM_MASK, &dummy);
+                lpm_priv->shadow.pm_interval = val;
+                break;
+        case pm_start_stop:
+                if (val != lpm_priv->shadow.pm_start_stop)
+                        result = lv1_set_lpm_trigger_control(lpm_priv->lpm_id,
+                                                             val,
+                                                             PS3_WRITE_PM_MASK,
+                                                             &dummy);
+                lpm_priv->shadow.pm_start_stop = val;
+                break;
+        case trace_address:
+        case ext_tr_timer:
+        case pm_status:
+                break;
+        default:
+                dev_dbg(sbd_core(), "%s:%u: unknown reg: %d\n", __func__,
+                        __LINE__, reg);
+                BUG();
+                break;
+        }
+
+        if (result)
+                dev_err(sbd_core(), "%s:%u: lv1 set_control failed: "
+                        "reg %u, %s\n", __func__, __LINE__, reg,
+                        ps3_result(result));
+}
+EXPORT_SYMBOL_GPL(ps3_write_pm);
+
+/**
+ * ps3_get_ctr_size - Get the size of a physical counter.
+ *
+ * Returns either 16 or 32.
+ */
+
+u32 ps3_get_ctr_size(u32 cpu, u32 phys_ctr)
+{
+        u32 pm_ctrl;
+
+        if (phys_ctr >= NR_PHYS_CTRS) {
+                dev_dbg(sbd_core(), "%s:%u: phys_ctr too big: %u\n", __func__,
+                        __LINE__, phys_ctr);
+                return 0;
+        }
+
+        pm_ctrl = ps3_read_pm(cpu, pm_control);
+        return (pm_ctrl & CBE_PM_16BIT_CTR(phys_ctr)) ? 16 : 32;
+}
+EXPORT_SYMBOL_GPL(ps3_get_ctr_size);
+
+/**
+ * ps3_set_ctr_size - Set the size of a physical counter to 16 or 32 bits.
+ */
+
+void ps3_set_ctr_size(u32 cpu, u32 phys_ctr, u32 ctr_size)
+{
+        u32 pm_ctrl;
+
+        if (phys_ctr >= NR_PHYS_CTRS) {
+                dev_dbg(sbd_core(), "%s:%u: phys_ctr too big: %u\n", __func__,
+                        __LINE__, phys_ctr);
+                return;
+        }
+
+        pm_ctrl = ps3_read_pm(cpu, pm_control);
+
+        switch (ctr_size) {
+        case 16:
+                pm_ctrl |= CBE_PM_16BIT_CTR(phys_ctr);
+                ps3_write_pm(cpu, pm_control, pm_ctrl);
+                break;
+
+        case 32:
+                pm_ctrl &= ~CBE_PM_16BIT_CTR(phys_ctr);
+                ps3_write_pm(cpu, pm_control, pm_ctrl);
+                break;
+        default:
+                BUG();
+        }
+}
+EXPORT_SYMBOL_GPL(ps3_set_ctr_size);
+
+static u64 pm_translate_signal_group_number_on_island2(u64 subgroup)
+{
+
+        if (subgroup == 2)
+                subgroup = 3;
+
+        if (subgroup <= 6)
+                return PM_ISLAND2_BASE_SIGNAL_GROUP_NUMBER + subgroup;
+        else if (subgroup == 7)
+                return PM_ISLAND2_SIGNAL_GROUP_NUMBER1;
+        else
+                return PM_ISLAND2_SIGNAL_GROUP_NUMBER2;
+}
+
+static u64 pm_translate_signal_group_number_on_island3(u64 subgroup)
+{
+
+        switch (subgroup) {
+        case 2:
+        case 3:
+        case 4:
+                subgroup += 2;
+                break;
+        case 5:
+                subgroup = 8;
+                break;
+        default:
+                break;
+        }
+        return PM_ISLAND3_BASE_SIGNAL_GROUP_NUMBER + subgroup;
+}
+
+static u64 pm_translate_signal_group_number_on_island4(u64 subgroup)
+{
+        return PM_ISLAND4_BASE_SIGNAL_GROUP_NUMBER + subgroup;
+}
+
+static u64 pm_translate_signal_group_number_on_island5(u64 subgroup)
+{
+
+        switch (subgroup) {
+        case 3:
+                subgroup = 4;
+                break;
+        case 4:
+                subgroup = 6;
+                break;
+        default:
+                break;
+        }
+        return PM_ISLAND5_BASE_SIGNAL_GROUP_NUMBER + subgroup;
+}
+
+static u64 pm_translate_signal_group_number_on_island6(u64 subgroup,
+                                                       u64 subsubgroup)
+{
+        switch (subgroup) {
+        case 3:
+        case 4:
+        case 5:
+                subgroup += 1;
+                break;
+        default:
+                break;
+        }
+
+        switch (subsubgroup) {
+        case 4:
+        case 5:
+        case 6:
+                subsubgroup += 2;
+                break;
+        case 7:
+        case 8:
+        case 9:
+        case 10:
+                subsubgroup += 4;
+                break;
+        case 11:
+        case 12:
+        case 13:
+                subsubgroup += 5;
+                break;
+        default:
+                break;
+        }
+
+        if (subgroup <= 5)
+                return (PM_ISLAND6_BASE_SIGNAL_GROUP_NUMBER + subgroup);
+        else
+                return (PM_ISLAND6_BASE_SIGNAL_GROUP_NUMBER + subgroup
+                        + subsubgroup - 1);
+}
+
+static u64 pm_translate_signal_group_number_on_island7(u64 subgroup)
+{
+        return PM_ISLAND7_BASE_SIGNAL_GROUP_NUMBER + subgroup;
+}
+
+static u64 pm_translate_signal_group_number_on_island8(u64 subgroup)
+{
+        return PM_ISLAND8_BASE_SIGNAL_GROUP_NUMBER + subgroup;
+}
+
+static u64 pm_signal_group_to_ps3_lv1_signal_group(u64 group)
+{
+        u64 island;
+        u64 subgroup;
+        u64 subsubgroup;
+
+        subgroup = 0;
+        subsubgroup = 0;
+        island = 0;
+        if (group < 1000) {
+                if (group < 100) {
+                        if (20 <= group && group < 30) {
+                                island = 2;
+                                subgroup = group - 20;
+                        } else if (30 <= group && group < 40) {
+                                island = 3;
+                                subgroup = group - 30;
+                        } else if (40 <= group && group < 50) {
+                                island = 4;
+                                subgroup = group - 40;
+                        } else if (50 <= group && group < 60) {
+                                island = 5;
+                                subgroup = group - 50;
+                        } else if (60 <= group && group < 70) {
+                                island = 6;
+                                subgroup = group - 60;
+                        } else if (70 <= group && group < 80) {
+                                island = 7;
+                                subgroup = group - 70;
+                        } else if (80 <= group && group < 90) {
+                                island = 8;
+                                subgroup = group - 80;
+                        }
+                } else if (200 <= group && group < 300) {
+                        island = 2;
+                        subgroup = group - 200;
+                } else if (600 <= group && group < 700) {
+                        island = 6;
+                        subgroup = 5;
+                        subsubgroup = group - 650;
+                }
+        } else if (6000 <= group && group < 7000) {
+                island = 6;
+                subgroup = 5;
+                subsubgroup = group - 6500;
+        }
+
+        switch (island) {
+        case 2:
+                return pm_translate_signal_group_number_on_island2(subgroup);
+        case 3:
+                return pm_translate_signal_group_number_on_island3(subgroup);
+        case 4:
+                return pm_translate_signal_group_number_on_island4(subgroup);
+        case 5:
+                return pm_translate_signal_group_number_on_island5(subgroup);
+        case 6:
+                return pm_translate_signal_group_number_on_island6(subgroup,
+                                                                   subsubgroup);
+        case 7:
+                return pm_translate_signal_group_number_on_island7(subgroup);
+        case 8:
+                return pm_translate_signal_group_number_on_island8(subgroup);
+        default:
+                dev_dbg(sbd_core(), "%s:%u: island not found: %lu\n", __func__,
+                        __LINE__, group);
+                BUG();
+                break;
+        }
+        return 0;
+}
+
+static u64 pm_bus_word_to_ps3_lv1_bus_word(u8 word)
+{
+
+        switch (word) {
+        case 1:
+                return 0xF000;
+        case 2:
+                return 0x0F00;
+        case 4:
+                return 0x00F0;
+        case 8:
+        default:
+                return 0x000F;
+        }
+}
+
+static int __ps3_set_signal(u64 lv1_signal_group, u64 bus_select,
+                            u64 signal_select, u64 attr1, u64 attr2, u64 attr3)
+{
+        int ret;
+
+        ret = lv1_set_lpm_signal(lpm_priv->lpm_id, lv1_signal_group, bus_select,
+                                 signal_select, attr1, attr2, attr3);
+        if (ret)
+                dev_err(sbd_core(),
+                        "%s:%u: error:%d 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
+                        __func__, __LINE__, ret, lv1_signal_group, bus_select,
+                        signal_select, attr1, attr2, attr3);
+
+        return ret;
+}
+
+int ps3_set_signal(u64 signal_group, u8 signal_bit, u16 sub_unit,
+                   u8 bus_word)
+{
+        int ret;
+        u64 lv1_signal_group;
+        u64 bus_select;
+        u64 signal_select;
+        u64 attr1, attr2, attr3;
+
+        if (signal_group == 0)
+                return __ps3_set_signal(0, 0, 0, 0, 0, 0);
+
+        lv1_signal_group =
+                pm_signal_group_to_ps3_lv1_signal_group(signal_group);
+        bus_select = pm_bus_word_to_ps3_lv1_bus_word(bus_word);
+
+        switch (signal_group) {
+        case PM_SIG_GROUP_SPU_TRIGGER:
+                signal_select = 1;
+                signal_select = signal_select << (63 - signal_bit);
+                break;
+        case PM_SIG_GROUP_SPU_EVENT:
+                signal_select = 1;
+                signal_select = (signal_select << (63 - signal_bit)) | 0x3;
+                break;
+        default:
+                signal_select = 0;
+                break;
+        }
+
+        /*
+         * 0: physical object.
+         * 1: logical object.
+         * This parameter is only used for the PPE and SPE signals.
+         */
+        attr1 = 1;
+
+        /*
+         * This parameter is used to specify the target physical/logical
+         * PPE/SPE object.
+         */
+        if (PM_SIG_GROUP_SPU <= signal_group &&
+                signal_group < PM_SIG_GROUP_MFC_MAX)
+                attr2 = sub_unit;
+        else
+                attr2 = lpm_priv->pu_id;
+
+        /*
+         * This parameter is only used for setting the SPE signal.
+         */
+        attr3 = 0;
+
+        ret = __ps3_set_signal(lv1_signal_group, bus_select, signal_select,
+                               attr1, attr2, attr3);
+        if (ret)
+                dev_err(sbd_core(), "%s:%u: __ps3_set_signal failed: %d\n",
+                        __func__, __LINE__, ret);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ps3_set_signal);
+
+u32 ps3_get_hw_thread_id(int cpu)
+{
+        return get_hard_smp_processor_id(cpu);
+}
+EXPORT_SYMBOL_GPL(ps3_get_hw_thread_id);
+
+/**
+ * ps3_enable_pm - Enable the entire performance monitoring unit.
+ *
+ * When we enable the LPM, all pending writes to counters get committed.
+ */
+
+void ps3_enable_pm(u32 cpu)
+{
+        int result;
+        u64 tmp;
+        int insert_bookmark = 0;
+
+        lpm_priv->tb_count = 0;
+
+        if (use_start_stop_bookmark) {
+                if (!(lpm_priv->shadow.pm_start_stop &
+                        (PS3_PM_START_STOP_START_MASK
+                        | PS3_PM_START_STOP_STOP_MASK))) {
+                        result = lv1_set_lpm_trigger_control(lpm_priv->lpm_id,
+                                (PS3_PM_START_STOP_PPU_TH0_BOOKMARK_START |
+                                PS3_PM_START_STOP_PPU_TH1_BOOKMARK_START |
+                                PS3_PM_START_STOP_PPU_TH0_BOOKMARK_STOP |
+                                PS3_PM_START_STOP_PPU_TH1_BOOKMARK_STOP),
+                                0xFFFFFFFFFFFFFFFFULL, &tmp);
+
+                        if (result)
+                                dev_err(sbd_core(), "%s:%u: "
+                                        "lv1_set_lpm_trigger_control failed: "
+                                        "%s\n", __func__, __LINE__,
+                                        ps3_result(result));
+
+                        insert_bookmark = !result;
+                }
+        }
+
+        result = lv1_start_lpm(lpm_priv->lpm_id);
+
+        if (result)
+                dev_err(sbd_core(), "%s:%u: lv1_start_lpm failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+
+        if (use_start_stop_bookmark && !result && insert_bookmark)
+                ps3_set_bookmark(get_tb() | PS3_PM_BOOKMARK_START);
+}
+EXPORT_SYMBOL_GPL(ps3_enable_pm);
+
+/**
+ * ps3_disable_pm - Disable the entire performance monitoring unit.
+ */
+
+void ps3_disable_pm(u32 cpu)
+{
+        int result;
+        u64 tmp;
+
+        ps3_set_bookmark(get_tb() | PS3_PM_BOOKMARK_STOP);
+
+        result = lv1_stop_lpm(lpm_priv->lpm_id, &tmp);
+
+        if (result) {
+                if(result != LV1_WRONG_STATE)
+                        dev_err(sbd_core(), "%s:%u: lv1_stop_lpm failed: %s\n",
+                                __func__, __LINE__, ps3_result(result));
+                return;
+        }
+
+        lpm_priv->tb_count = tmp;
+
+        dev_dbg(sbd_core(), "%s:%u: tb_count %lu (%lxh)\n", __func__, __LINE__,
+                lpm_priv->tb_count, lpm_priv->tb_count);
+}
+EXPORT_SYMBOL_GPL(ps3_disable_pm);
+
+/**
+ * ps3_lpm_copy_tb - Copy data from the trace buffer to a kernel buffer.
+ * @offset: Offset in bytes from the start of the trace buffer.
+ * @buf: Copy destination.
+ * @count: Maximum count of bytes to copy.
+ * @bytes_copied: Pointer to a variable that will recieve the number of
+ *  bytes copied to @buf.
+ *
+ * On error @buf will contain any successfully copied trace buffer data
+ * and bytes_copied will be set to the number of bytes successfully copied.
+ */
+
+int ps3_lpm_copy_tb(unsigned long offset, void *buf, unsigned long count,
+                    unsigned long *bytes_copied)
+{
+        int result;
+
+        *bytes_copied = 0;
+
+        if (!lpm_priv->tb_cache)
+                return -EPERM;
+
+        if (offset >= lpm_priv->tb_count)
+                return 0;
+
+        count = min(count, lpm_priv->tb_count - offset);
+
+        while (*bytes_copied < count) {
+                const unsigned long request = count - *bytes_copied;
+                u64 tmp;
+
+                result = lv1_copy_lpm_trace_buffer(lpm_priv->lpm_id, offset,
+                                                   request, &tmp);
+                if (result) {
+                        dev_dbg(sbd_core(), "%s:%u: 0x%lx bytes at 0x%lx\n",
+                                __func__, __LINE__, request, offset);
+
+                        dev_err(sbd_core(), "%s:%u: lv1_copy_lpm_trace_buffer "
+                                "failed: %s\n", __func__, __LINE__,
+                                ps3_result(result));
+                        return result == LV1_WRONG_STATE ? -EBUSY : -EINVAL;
+                }
+
+                memcpy(buf, lpm_priv->tb_cache, tmp);
+                buf += tmp;
+                *bytes_copied += tmp;
+                offset += tmp;
+        }
+        dev_dbg(sbd_core(), "%s:%u: copied %lxh bytes\n", __func__, __LINE__,
+                *bytes_copied);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ps3_lpm_copy_tb);
+
+/**
+ * ps3_lpm_copy_tb_to_user - Copy data from the trace buffer to a user buffer.
+ * @offset: Offset in bytes from the start of the trace buffer.
+ * @buf: A __user copy destination.
+ * @count: Maximum count of bytes to copy.
+ * @bytes_copied: Pointer to a variable that will recieve the number of
+ *  bytes copied to @buf.
+ *
+ * On error @buf will contain any successfully copied trace buffer data
+ * and bytes_copied will be set to the number of bytes successfully copied.
+ */
+
+int ps3_lpm_copy_tb_to_user(unsigned long offset, void __user *buf,
+                            unsigned long count, unsigned long *bytes_copied)
+{
+        int result;
+
+        *bytes_copied = 0;
+
+        if (!lpm_priv->tb_cache)
+                return -EPERM;
+
+        if (offset >= lpm_priv->tb_count)
+                return 0;
+
+        count = min(count, lpm_priv->tb_count - offset);
+
+        while (*bytes_copied < count) {
+                const unsigned long request = count - *bytes_copied;
+                u64 tmp;
+
+                result = lv1_copy_lpm_trace_buffer(lpm_priv->lpm_id, offset,
+                                                   request, &tmp);
+                if (result) {
+                        dev_dbg(sbd_core(), "%s:%u: 0x%lx bytes at 0x%lx\n",
+                                __func__, __LINE__, request, offset);
+                        dev_err(sbd_core(), "%s:%u: lv1_copy_lpm_trace_buffer "
+                                "failed: %s\n", __func__, __LINE__,
+                                ps3_result(result));
+                        return result == LV1_WRONG_STATE ? -EBUSY : -EINVAL;
+                }
+
+                result = copy_to_user(buf, lpm_priv->tb_cache, tmp);
+
+                if (result) {
+                        dev_dbg(sbd_core(), "%s:%u: 0x%lx bytes at 0x%p\n",
+                                __func__, __LINE__, tmp, buf);
+                        dev_err(sbd_core(), "%s:%u: copy_to_user failed: %d\n",
+                                __func__, __LINE__, result);
+                        return -EFAULT;
+                }
+
+                buf += tmp;
+                *bytes_copied += tmp;
+                offset += tmp;
+        }
+        dev_dbg(sbd_core(), "%s:%u: copied %lxh bytes\n", __func__, __LINE__,
+                *bytes_copied);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ps3_lpm_copy_tb_to_user);
+
+/**
+ * ps3_get_and_clear_pm_interrupts -
+ *
+ * Clearing interrupts for the entire performance monitoring unit.
+ * Reading pm_status clears the interrupt bits.
+ */
+
+u32 ps3_get_and_clear_pm_interrupts(u32 cpu)
+{
+        return ps3_read_pm(cpu, pm_status);
+}
+EXPORT_SYMBOL_GPL(ps3_get_and_clear_pm_interrupts);
+
+/**
+ * ps3_enable_pm_interrupts -
+ *
+ * Enabling interrupts for the entire performance monitoring unit.
+ * Enables the interrupt bits in the pm_status register.
+ */
+
+void ps3_enable_pm_interrupts(u32 cpu, u32 thread, u32 mask)
+{
+        if (mask)
+                ps3_write_pm(cpu, pm_status, mask);
+}
+EXPORT_SYMBOL_GPL(ps3_enable_pm_interrupts);
+
+/**
+ * ps3_enable_pm_interrupts -
+ *
+ * Disabling interrupts for the entire performance monitoring unit.
+ */
+
+void ps3_disable_pm_interrupts(u32 cpu)
+{
+        ps3_get_and_clear_pm_interrupts(cpu);
+        ps3_write_pm(cpu, pm_status, 0);
+}
+EXPORT_SYMBOL_GPL(ps3_disable_pm_interrupts);
+
+/**
+ * ps3_lpm_open - Open the logical performance monitor device.
+ * @tb_type: Specifies the type of trace buffer lv1 sould use for this lpm
+ *  instance, specified by one of enum ps3_lpm_tb_type.
+ * @tb_cache: Optional user supplied buffer to use as the trace buffer cache.
+ *  If NULL, the driver will allocate and manage an internal buffer.
+ *  Unused when when @tb_type is PS3_LPM_TB_TYPE_NONE.
+ * @tb_cache_size: The size in bytes of the user supplied @tb_cache buffer.
+ *  Unused when @tb_cache is NULL or @tb_type is PS3_LPM_TB_TYPE_NONE.
+ */
+
+int ps3_lpm_open(enum ps3_lpm_tb_type tb_type, void *tb_cache,
+        u64 tb_cache_size)
+{
+        int result;
+        u64 tb_size;
+
+        BUG_ON(!lpm_priv);
+        BUG_ON(tb_type != PS3_LPM_TB_TYPE_NONE
+                && tb_type != PS3_LPM_TB_TYPE_INTERNAL);
+
+        if (tb_type == PS3_LPM_TB_TYPE_NONE && tb_cache)
+                dev_dbg(sbd_core(), "%s:%u: bad in vals\n", __func__, __LINE__);
+
+        if (!atomic_add_unless(&lpm_priv->open, 1, 1)) {
+                dev_dbg(sbd_core(), "%s:%u: busy\n", __func__, __LINE__);
+                return -EBUSY;
+        }
+
+        /* Note tb_cache needs 128 byte alignment. */
+
+        if (tb_type == PS3_LPM_TB_TYPE_NONE) {
+                lpm_priv->tb_cache_size = 0;
+                lpm_priv->tb_cache_internal = NULL;
+                lpm_priv->tb_cache = NULL;
+        } else if (tb_cache) {
+                if (tb_cache != (void *)_ALIGN_UP((unsigned long)tb_cache, 128)
+                        || tb_cache_size != _ALIGN_UP(tb_cache_size, 128)) {
+                        dev_err(sbd_core(), "%s:%u: unaligned tb_cache\n",
+                                __func__, __LINE__);
+                        result = -EINVAL;
+                        goto fail_align;
+                }
+                lpm_priv->tb_cache_size = tb_cache_size;
+                lpm_priv->tb_cache_internal = NULL;
+                lpm_priv->tb_cache = tb_cache;
+        } else {
+                lpm_priv->tb_cache_size = PS3_LPM_DEFAULT_TB_CACHE_SIZE;
+                lpm_priv->tb_cache_internal = kzalloc(
+                        lpm_priv->tb_cache_size + 127, GFP_KERNEL);
+                if (!lpm_priv->tb_cache_internal) {
+                        dev_err(sbd_core(), "%s:%u: alloc internal tb_cache "
+                                "failed\n", __func__, __LINE__);
+                        result = -ENOMEM;
+                        goto fail_malloc;
+                }
+                lpm_priv->tb_cache = (void *)_ALIGN_UP(
+                        (unsigned long)lpm_priv->tb_cache_internal, 128);
+        }
+
+        result = lv1_construct_lpm(lpm_priv->node_id, tb_type, 0, 0,
+                                ps3_mm_phys_to_lpar(__pa(lpm_priv->tb_cache)),
+                                lpm_priv->tb_cache_size, &lpm_priv->lpm_id,
+                                &lpm_priv->outlet_id, &tb_size);
+
+        if (result) {
+                dev_err(sbd_core(), "%s:%u: lv1_construct_lpm failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                result = -EINVAL;
+                goto fail_construct;
+        }
+
+        lpm_priv->shadow.pm_control = PS3_LPM_SHADOW_REG_INIT;
+        lpm_priv->shadow.pm_start_stop = PS3_LPM_SHADOW_REG_INIT;
+        lpm_priv->shadow.pm_interval = PS3_LPM_SHADOW_REG_INIT;
+        lpm_priv->shadow.group_control = PS3_LPM_SHADOW_REG_INIT;
+        lpm_priv->shadow.debug_bus_control = PS3_LPM_SHADOW_REG_INIT;
+
+        dev_dbg(sbd_core(), "%s:%u: lpm_id 0x%lx, outlet_id 0x%lx, "
+                "tb_size 0x%lx\n", __func__, __LINE__, lpm_priv->lpm_id,
+                lpm_priv->outlet_id, tb_size);
+
+        return 0;
+
+fail_construct:
+        kfree(lpm_priv->tb_cache_internal);
+        lpm_priv->tb_cache_internal = NULL;
+fail_malloc:
+fail_align:
+        atomic_dec(&lpm_priv->open);
+        return result;
+}
+EXPORT_SYMBOL_GPL(ps3_lpm_open);
+
+/**
+ * ps3_lpm_close - Close the lpm device.
+ *
+ */
+
+int ps3_lpm_close(void)
+{
+        dev_dbg(sbd_core(), "%s:%u\n", __func__, __LINE__);
+
+        lv1_destruct_lpm(lpm_priv->lpm_id);
+        lpm_priv->lpm_id = 0;
+
+        kfree(lpm_priv->tb_cache_internal);
+        lpm_priv->tb_cache_internal = NULL;
+
+        atomic_dec(&lpm_priv->open);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ps3_lpm_close);
+
+static int __devinit ps3_lpm_probe(struct ps3_system_bus_device *dev)
+{
+        dev_dbg(&dev->core, " -> %s:%u\n", __func__, __LINE__);
+
+        if (lpm_priv) {
+                dev_info(&dev->core, "%s:%u: called twice\n",
+                        __func__, __LINE__);
+                return -EBUSY;
+        }
+
+        lpm_priv = kzalloc(sizeof(*lpm_priv), GFP_KERNEL);
+
+        if (!lpm_priv)
+                return -ENOMEM;
+
+        lpm_priv->sbd = dev;
+        lpm_priv->node_id = dev->lpm.node_id;
+        lpm_priv->pu_id = dev->lpm.pu_id;
+        lpm_priv->rights = dev->lpm.rights;
+
+        dev_info(&dev->core, " <- %s:%u:\n", __func__, __LINE__);
+
+        return 0;
+}
+
+static int ps3_lpm_remove(struct ps3_system_bus_device *dev)
+{
+        dev_dbg(&dev->core, " -> %s:%u:\n", __func__, __LINE__);
+
+        ps3_lpm_close();
+
+        kfree(lpm_priv);
+        lpm_priv = NULL;
+
+        dev_info(&dev->core, " <- %s:%u:\n", __func__, __LINE__);
+        return 0;
+}
+
+static struct ps3_system_bus_driver ps3_lpm_driver = {
+        .match_id = PS3_MATCH_ID_LPM,
+        .core.name      = "ps3-lpm",
+        .core.owner     = THIS_MODULE,
+        .probe          = ps3_lpm_probe,
+        .remove         = ps3_lpm_remove,
+        .shutdown       = ps3_lpm_remove,
+};
+
+static int __init ps3_lpm_init(void)
+{
+        pr_debug("%s:%d:\n", __func__, __LINE__);
+        return ps3_system_bus_driver_register(&ps3_lpm_driver);
+}
+
+static void __exit ps3_lpm_exit(void)
+{
+        pr_debug("%s:%d:\n", __func__, __LINE__);
+        ps3_system_bus_driver_unregister(&ps3_lpm_driver);
+}
+
+module_init(ps3_lpm_init);
+module_exit(ps3_lpm_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("PS3 Logical Performance Monitor Driver");
+MODULE_AUTHOR("Sony Corporation");
+MODULE_ALIAS(PS3_MODULE_ALIAS_LPM);