[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>

1 files changed, 1248 insertions, 0 deletions

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);