Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 794 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/ps3/interrupt.c b/arch/powerpc/platforms/ps3/interrupt.c
new file mode 100644
index 000000000..98f8c3611
--- /dev/null
+++ b/arch/powerpc/platforms/ps3/interrupt.c
@@ -0,0 +1,794 @@
+/*
+ *  PS3 interrupt routines.
+ *
+ *  Copyright (C) 2006 Sony Computer Entertainment Inc.
+ *  Copyright 2006 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/export.h>
+#include <linux/irq.h>
+
+#include <asm/machdep.h>
+#include <asm/udbg.h>
+#include <asm/lv1call.h>
+#include <asm/smp.h>
+
+#include "platform.h"
+
+#if defined(DEBUG)
+#define DBG udbg_printf
+#define FAIL udbg_printf
+#else
+#define DBG pr_devel
+#define FAIL pr_debug
+#endif
+
+/**
+ * struct ps3_bmp - a per cpu irq status and mask bitmap structure
+ * @status: 256 bit status bitmap indexed by plug
+ * @unused_1: Alignment
+ * @mask: 256 bit mask bitmap indexed by plug
+ * @unused_2: Alignment
+ *
+ * The HV maintains per SMT thread mappings of HV outlet to HV plug on
+ * behalf of the guest.  These mappings are implemented as 256 bit guest
+ * supplied bitmaps indexed by plug number.  The addresses of the bitmaps
+ * are registered with the HV through lv1_configure_irq_state_bitmap().
+ * The HV requires that the 512 bits of status + mask not cross a page
+ * boundary.  PS3_BMP_MINALIGN is used to define this minimal 64 byte
+ * alignment.
+ *
+ * The HV supports 256 plugs per thread, assigned as {0..255}, for a total
+ * of 512 plugs supported on a processor.  To simplify the logic this
+ * implementation equates HV plug value to Linux virq value, constrains each
+ * interrupt to have a system wide unique plug number, and limits the range
+ * of the plug values to map into the first dword of the bitmaps.  This
+ * gives a usable range of plug values of  {NUM_ISA_INTERRUPTS..63}.  Note
+ * that there is no constraint on how many in this set an individual thread
+ * can acquire.
+ *
+ * The mask is declared as unsigned long so we can use set/clear_bit on it.
+ */
+
+#define PS3_BMP_MINALIGN 64
+
+struct ps3_bmp {
+	struct {
+		u64 status;
+		u64 unused_1[3];
+		unsigned long mask;
+		u64 unused_2[3];
+	};
+};
+
+/**
+ * struct ps3_private - a per cpu data structure
+ * @bmp: ps3_bmp structure
+ * @bmp_lock: Synchronize access to bmp.
+ * @ipi_debug_brk_mask: Mask for debug break IPIs
+ * @ppe_id: HV logical_ppe_id
+ * @thread_id: HV thread_id
+ * @ipi_mask: Mask of IPI virqs
+ */
+
+struct ps3_private {
+	struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
+	spinlock_t bmp_lock;
+	u64 ppe_id;
+	u64 thread_id;
+	unsigned long ipi_debug_brk_mask;
+	unsigned long ipi_mask;
+};
+
+static DEFINE_PER_CPU(struct ps3_private, ps3_private);
+
+/**
+ * ps3_chip_mask - Set an interrupt mask bit in ps3_bmp.
+ * @virq: The assigned Linux virq.
+ *
+ * Sets ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
+ */
+
+static void ps3_chip_mask(struct irq_data *d)
+{
+	struct ps3_private *pd = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	DBG("%s:%d: thread_id %llu, virq %d\n", __func__, __LINE__,
+		pd->thread_id, d->irq);
+
+	local_irq_save(flags);
+	clear_bit(63 - d->irq, &pd->bmp.mask);
+	lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
+	local_irq_restore(flags);
+}
+
+/**
+ * ps3_chip_unmask - Clear an interrupt mask bit in ps3_bmp.
+ * @virq: The assigned Linux virq.
+ *
+ * Clears ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
+ */
+
+static void ps3_chip_unmask(struct irq_data *d)
+{
+	struct ps3_private *pd = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	DBG("%s:%d: thread_id %llu, virq %d\n", __func__, __LINE__,
+		pd->thread_id, d->irq);
+
+	local_irq_save(flags);
+	set_bit(63 - d->irq, &pd->bmp.mask);
+	lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
+	local_irq_restore(flags);
+}
+
+/**
+ * ps3_chip_eoi - HV end-of-interrupt.
+ * @virq: The assigned Linux virq.
+ *
+ * Calls lv1_end_of_interrupt_ext().
+ */
+
+static void ps3_chip_eoi(struct irq_data *d)
+{
+	const struct ps3_private *pd = irq_data_get_irq_chip_data(d);
+
+	/* non-IPIs are EOIed here. */
+
+	if (!test_bit(63 - d->irq, &pd->ipi_mask))
+		lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, d->irq);
+}
+
+/**
+ * ps3_irq_chip - Represents the ps3_bmp as a Linux struct irq_chip.
+ */
+
+static struct irq_chip ps3_irq_chip = {
+	.name = "ps3",
+	.irq_mask = ps3_chip_mask,
+	.irq_unmask = ps3_chip_unmask,
+	.irq_eoi = ps3_chip_eoi,
+};
+
+/**
+ * ps3_virq_setup - virq related setup.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @outlet: The HV outlet from the various create outlet routines.
+ * @virq: The assigned Linux virq.
+ *
+ * Calls irq_create_mapping() to get a virq and sets the chip data to
+ * ps3_private data.
+ */
+
+static int ps3_virq_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
+			  unsigned int *virq)
+{
+	int result;
+	struct ps3_private *pd;
+
+	/* This defines the default interrupt distribution policy. */
+
+	if (cpu == PS3_BINDING_CPU_ANY)
+		cpu = 0;
+
+	pd = &per_cpu(ps3_private, cpu);
+
+	*virq = irq_create_mapping(NULL, outlet);
+
+	if (!*virq) {
+		FAIL("%s:%d: irq_create_mapping failed: outlet %lu\n",
+			__func__, __LINE__, outlet);
+		result = -ENOMEM;
+		goto fail_create;
+	}
+
+	DBG("%s:%d: outlet %lu => cpu %u, virq %u\n", __func__, __LINE__,
+		outlet, cpu, *virq);
+
+	result = irq_set_chip_data(*virq, pd);
+
+	if (result) {
+		FAIL("%s:%d: irq_set_chip_data failed\n",
+			__func__, __LINE__);
+		goto fail_set;
+	}
+
+	ps3_chip_mask(irq_get_irq_data(*virq));
+
+	return result;
+
+fail_set:
+	irq_dispose_mapping(*virq);
+fail_create:
+	return result;
+}
+
+/**
+ * ps3_virq_destroy - virq related teardown.
+ * @virq: The assigned Linux virq.
+ *
+ * Clears chip data and calls irq_dispose_mapping() for the virq.
+ */
+
+static int ps3_virq_destroy(unsigned int virq)
+{
+	const struct ps3_private *pd = irq_get_chip_data(virq);
+
+	DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n", __func__,
+		__LINE__, pd->ppe_id, pd->thread_id, virq);
+
+	irq_set_chip_data(virq, NULL);
+	irq_dispose_mapping(virq);
+
+	DBG("%s:%d <-\n", __func__, __LINE__);
+	return 0;
+}
+
+/**
+ * ps3_irq_plug_setup - Generic outlet and virq related setup.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @outlet: The HV outlet from the various create outlet routines.
+ * @virq: The assigned Linux virq.
+ *
+ * Sets up virq and connects the irq plug.
+ */
+
+int ps3_irq_plug_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
+	unsigned int *virq)
+{
+	int result;
+	struct ps3_private *pd;
+
+	result = ps3_virq_setup(cpu, outlet, virq);
+
+	if (result) {
+		FAIL("%s:%d: ps3_virq_setup failed\n", __func__, __LINE__);
+		goto fail_setup;
+	}
+
+	pd = irq_get_chip_data(*virq);
+
+	/* Binds outlet to cpu + virq. */
+
+	result = lv1_connect_irq_plug_ext(pd->ppe_id, pd->thread_id, *virq,
+		outlet, 0);
+
+	if (result) {
+		FAIL("%s:%d: lv1_connect_irq_plug_ext failed: %s\n",
+		__func__, __LINE__, ps3_result(result));
+		result = -EPERM;
+		goto fail_connect;
+	}
+
+	return result;
+
+fail_connect:
+	ps3_virq_destroy(*virq);
+fail_setup:
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_irq_plug_setup);
+
+/**
+ * ps3_irq_plug_destroy - Generic outlet and virq related teardown.
+ * @virq: The assigned Linux virq.
+ *
+ * Disconnects the irq plug and tears down virq.
+ * Do not call for system bus event interrupts setup with
+ * ps3_sb_event_receive_port_setup().
+ */
+
+int ps3_irq_plug_destroy(unsigned int virq)
+{
+	int result;
+	const struct ps3_private *pd = irq_get_chip_data(virq);
+
+	DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n", __func__,
+		__LINE__, pd->ppe_id, pd->thread_id, virq);
+
+	ps3_chip_mask(irq_get_irq_data(virq));
+
+	result = lv1_disconnect_irq_plug_ext(pd->ppe_id, pd->thread_id, virq);
+
+	if (result)
+		FAIL("%s:%d: lv1_disconnect_irq_plug_ext failed: %s\n",
+		__func__, __LINE__, ps3_result(result));
+
+	ps3_virq_destroy(virq);
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_irq_plug_destroy);
+
+/**
+ * ps3_event_receive_port_setup - Setup an event receive port.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @virq: The assigned Linux virq.
+ *
+ * The virq can be used with lv1_connect_interrupt_event_receive_port() to
+ * arrange to receive interrupts from system-bus devices, or with
+ * ps3_send_event_locally() to signal events.
+ */
+
+int ps3_event_receive_port_setup(enum ps3_cpu_binding cpu, unsigned int *virq)
+{
+	int result;
+	u64 outlet;
+
+	result = lv1_construct_event_receive_port(&outlet);
+
+	if (result) {
+		FAIL("%s:%d: lv1_construct_event_receive_port failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+		*virq = 0;
+		return result;
+	}
+
+	result = ps3_irq_plug_setup(cpu, outlet, virq);
+	BUG_ON(result);
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_event_receive_port_setup);
+
+/**
+ * ps3_event_receive_port_destroy - Destroy an event receive port.
+ * @virq: The assigned Linux virq.
+ *
+ * Since ps3_event_receive_port_destroy destroys the receive port outlet,
+ * SB devices need to call disconnect_interrupt_event_receive_port() before
+ * this.
+ */
+
+int ps3_event_receive_port_destroy(unsigned int virq)
+{
+	int result;
+
+	DBG(" -> %s:%d virq %u\n", __func__, __LINE__, virq);
+
+	ps3_chip_mask(irq_get_irq_data(virq));
+
+	result = lv1_destruct_event_receive_port(virq_to_hw(virq));
+
+	if (result)
+		FAIL("%s:%d: lv1_destruct_event_receive_port failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+
+	/*
+	 * Don't call ps3_virq_destroy() here since ps3_smp_cleanup_cpu()
+	 * calls from interrupt context (smp_call_function) when kexecing.
+	 */
+
+	DBG(" <- %s:%d\n", __func__, __LINE__);
+	return result;
+}
+
+int ps3_send_event_locally(unsigned int virq)
+{
+	return lv1_send_event_locally(virq_to_hw(virq));
+}
+
+/**
+ * ps3_sb_event_receive_port_setup - Setup a system bus event receive port.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @dev: The system bus device instance.
+ * @virq: The assigned Linux virq.
+ *
+ * An event irq represents a virtual device interrupt.  The interrupt_id
+ * coresponds to the software interrupt number.
+ */
+
+int ps3_sb_event_receive_port_setup(struct ps3_system_bus_device *dev,
+	enum ps3_cpu_binding cpu, unsigned int *virq)
+{
+	/* this should go in system-bus.c */
+
+	int result;
+
+	result = ps3_event_receive_port_setup(cpu, virq);
+
+	if (result)
+		return result;
+
+	result = lv1_connect_interrupt_event_receive_port(dev->bus_id,
+		dev->dev_id, virq_to_hw(*virq), dev->interrupt_id);
+
+	if (result) {
+		FAIL("%s:%d: lv1_connect_interrupt_event_receive_port"
+			" failed: %s\n", __func__, __LINE__,
+			ps3_result(result));
+		ps3_event_receive_port_destroy(*virq);
+		*virq = 0;
+		return result;
+	}
+
+	DBG("%s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
+		dev->interrupt_id, *virq);
+
+	return 0;
+}
+EXPORT_SYMBOL(ps3_sb_event_receive_port_setup);
+
+int ps3_sb_event_receive_port_destroy(struct ps3_system_bus_device *dev,
+	unsigned int virq)
+{
+	/* this should go in system-bus.c */
+
+	int result;
+
+	DBG(" -> %s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
+		dev->interrupt_id, virq);
+
+	result = lv1_disconnect_interrupt_event_receive_port(dev->bus_id,
+		dev->dev_id, virq_to_hw(virq), dev->interrupt_id);
+
+	if (result)
+		FAIL("%s:%d: lv1_disconnect_interrupt_event_receive_port"
+			" failed: %s\n", __func__, __LINE__,
+			ps3_result(result));
+
+	result = ps3_event_receive_port_destroy(virq);
+	BUG_ON(result);
+
+	/*
+	 * ps3_event_receive_port_destroy() destroys the IRQ plug,
+	 * so don't call ps3_irq_plug_destroy() here.
+	 */
+
+	result = ps3_virq_destroy(virq);
+	BUG_ON(result);
+
+	DBG(" <- %s:%d\n", __func__, __LINE__);
+	return result;
+}
+EXPORT_SYMBOL(ps3_sb_event_receive_port_destroy);
+
+/**
+ * ps3_io_irq_setup - Setup a system bus io irq.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @interrupt_id: The device interrupt id read from the system repository.
+ * @virq: The assigned Linux virq.
+ *
+ * An io irq represents a non-virtualized device interrupt.  interrupt_id
+ * coresponds to the interrupt number of the interrupt controller.
+ */
+
+int ps3_io_irq_setup(enum ps3_cpu_binding cpu, unsigned int interrupt_id,
+	unsigned int *virq)
+{
+	int result;
+	u64 outlet;
+
+	result = lv1_construct_io_irq_outlet(interrupt_id, &outlet);
+
+	if (result) {
+		FAIL("%s:%d: lv1_construct_io_irq_outlet failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+		return result;
+	}
+
+	result = ps3_irq_plug_setup(cpu, outlet, virq);
+	BUG_ON(result);
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_io_irq_setup);
+
+int ps3_io_irq_destroy(unsigned int virq)
+{
+	int result;
+	unsigned long outlet = virq_to_hw(virq);
+
+	ps3_chip_mask(irq_get_irq_data(virq));
+
+	/*
+	 * lv1_destruct_io_irq_outlet() will destroy the IRQ plug,
+	 * so call ps3_irq_plug_destroy() first.
+	 */
+
+	result = ps3_irq_plug_destroy(virq);
+	BUG_ON(result);
+
+	result = lv1_destruct_io_irq_outlet(outlet);
+
+	if (result)
+		FAIL("%s:%d: lv1_destruct_io_irq_outlet failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_io_irq_destroy);
+
+/**
+ * ps3_vuart_irq_setup - Setup the system virtual uart virq.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @virt_addr_bmp: The caller supplied virtual uart interrupt bitmap.
+ * @virq: The assigned Linux virq.
+ *
+ * The system supports only a single virtual uart, so multiple calls without
+ * freeing the interrupt will return a wrong state error.
+ */
+
+int ps3_vuart_irq_setup(enum ps3_cpu_binding cpu, void* virt_addr_bmp,
+	unsigned int *virq)
+{
+	int result;
+	u64 outlet;
+	u64 lpar_addr;
+
+	BUG_ON(!is_kernel_addr((u64)virt_addr_bmp));
+
+	lpar_addr = ps3_mm_phys_to_lpar(__pa(virt_addr_bmp));
+
+	result = lv1_configure_virtual_uart_irq(lpar_addr, &outlet);
+
+	if (result) {
+		FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+		return result;
+	}
+
+	result = ps3_irq_plug_setup(cpu, outlet, virq);
+	BUG_ON(result);
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_vuart_irq_setup);
+
+int ps3_vuart_irq_destroy(unsigned int virq)
+{
+	int result;
+
+	ps3_chip_mask(irq_get_irq_data(virq));
+	result = lv1_deconfigure_virtual_uart_irq();
+
+	if (result) {
+		FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+		return result;
+	}
+
+	result = ps3_irq_plug_destroy(virq);
+	BUG_ON(result);
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(ps3_vuart_irq_destroy);
+
+/**
+ * ps3_spe_irq_setup - Setup an spe virq.
+ * @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
+ * serviced on.
+ * @spe_id: The spe_id returned from lv1_construct_logical_spe().
+ * @class: The spe interrupt class {0,1,2}.
+ * @virq: The assigned Linux virq.
+ *
+ */
+
+int ps3_spe_irq_setup(enum ps3_cpu_binding cpu, unsigned long spe_id,
+	unsigned int class, unsigned int *virq)
+{
+	int result;
+	u64 outlet;
+
+	BUG_ON(class > 2);
+
+	result = lv1_get_spe_irq_outlet(spe_id, class, &outlet);
+
+	if (result) {
+		FAIL("%s:%d: lv1_get_spe_irq_outlet failed: %s\n",
+			__func__, __LINE__, ps3_result(result));
+		return result;
+	}
+
+	result = ps3_irq_plug_setup(cpu, outlet, virq);
+	BUG_ON(result);
+
+	return result;
+}
+
+int ps3_spe_irq_destroy(unsigned int virq)
+{
+	int result;
+
+	ps3_chip_mask(irq_get_irq_data(virq));
+
+	result = ps3_irq_plug_destroy(virq);
+	BUG_ON(result);
+
+	return result;
+}
+
+
+#define PS3_INVALID_OUTLET ((irq_hw_number_t)-1)
+#define PS3_PLUG_MAX 63
+
+#if defined(DEBUG)
+static void _dump_64_bmp(const char *header, const u64 *p, unsigned cpu,
+	const char* func, int line)
+{
+	pr_debug("%s:%d: %s %u {%04llx_%04llx_%04llx_%04llx}\n",
+		func, line, header, cpu,
+		*p >> 48, (*p >> 32) & 0xffff, (*p >> 16) & 0xffff,
+		*p & 0xffff);
+}
+
+static void __maybe_unused _dump_256_bmp(const char *header,
+	const u64 *p, unsigned cpu, const char* func, int line)
+{
+	pr_debug("%s:%d: %s %u {%016llx:%016llx:%016llx:%016llx}\n",
+		func, line, header, cpu, p[0], p[1], p[2], p[3]);
+}
+
+#define dump_bmp(_x) _dump_bmp(_x, __func__, __LINE__)
+static void _dump_bmp(struct ps3_private* pd, const char* func, int line)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&pd->bmp_lock, flags);
+	_dump_64_bmp("stat", &pd->bmp.status, pd->thread_id, func, line);
+	_dump_64_bmp("mask", (u64*)&pd->bmp.mask, pd->thread_id, func, line);
+	spin_unlock_irqrestore(&pd->bmp_lock, flags);
+}
+
+#define dump_mask(_x) _dump_mask(_x, __func__, __LINE__)
+static void __maybe_unused _dump_mask(struct ps3_private *pd,
+	const char* func, int line)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&pd->bmp_lock, flags);
+	_dump_64_bmp("mask", (u64*)&pd->bmp.mask, pd->thread_id, func, line);
+	spin_unlock_irqrestore(&pd->bmp_lock, flags);
+}
+#else
+static void dump_bmp(struct ps3_private* pd) {};
+#endif /* defined(DEBUG) */
+
+static int ps3_host_map(struct irq_domain *h, unsigned int virq,
+	irq_hw_number_t hwirq)
+{
+	DBG("%s:%d: hwirq %lu, virq %u\n", __func__, __LINE__, hwirq,
+		virq);
+
+	irq_set_chip_and_handler(virq, &ps3_irq_chip, handle_fasteoi_irq);
+
+	return 0;
+}
+
+static int ps3_host_match(struct irq_domain *h, struct device_node *np,
+			  enum irq_domain_bus_token bus_token)
+{
+	/* Match all */
+	return 1;
+}
+
+static const struct irq_domain_ops ps3_host_ops = {
+	.map = ps3_host_map,
+	.match = ps3_host_match,
+};
+
+void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
+{
+	struct ps3_private *pd = &per_cpu(ps3_private, cpu);
+
+	set_bit(63 - virq, &pd->ipi_debug_brk_mask);
+
+	DBG("%s:%d: cpu %u, virq %u, mask %lxh\n", __func__, __LINE__,
+		cpu, virq, pd->ipi_debug_brk_mask);
+}
+
+void __init ps3_register_ipi_irq(unsigned int cpu, unsigned int virq)
+{
+	struct ps3_private *pd = &per_cpu(ps3_private, cpu);
+
+	set_bit(63 - virq, &pd->ipi_mask);
+
+	DBG("%s:%d: cpu %u, virq %u, ipi_mask %lxh\n", __func__, __LINE__,
+		cpu, virq, pd->ipi_mask);
+}
+
+static unsigned int ps3_get_irq(void)
+{
+	struct ps3_private *pd = this_cpu_ptr(&ps3_private);
+	u64 x = (pd->bmp.status & pd->bmp.mask);
+	unsigned int plug;
+
+	/* check for ipi break first to stop this cpu ASAP */
+
+	if (x & pd->ipi_debug_brk_mask)
+		x &= pd->ipi_debug_brk_mask;
+
+	asm volatile("cntlzd %0,%1" : "=r" (plug) : "r" (x));
+	plug &= 0x3f;
+
+	if (unlikely(!plug)) {
+		DBG("%s:%d: no plug found: thread_id %llu\n", __func__,
+			__LINE__, pd->thread_id);
+		dump_bmp(&per_cpu(ps3_private, 0));
+		dump_bmp(&per_cpu(ps3_private, 1));
+		return 0;
+	}
+
+#if defined(DEBUG)
+	if (unlikely(plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX)) {
+		dump_bmp(&per_cpu(ps3_private, 0));
+		dump_bmp(&per_cpu(ps3_private, 1));
+		BUG();
+	}
+#endif
+
+	/* IPIs are EOIed here. */
+
+	if (test_bit(63 - plug, &pd->ipi_mask))
+		lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, plug);
+
+	return plug;
+}
+
+void __init ps3_init_IRQ(void)
+{
+	int result;
+	unsigned cpu;
+	struct irq_domain *host;
+
+	host = irq_domain_add_nomap(NULL, PS3_PLUG_MAX + 1, &ps3_host_ops, NULL);
+	irq_set_default_host(host);
+
+	for_each_possible_cpu(cpu) {
+		struct ps3_private *pd = &per_cpu(ps3_private, cpu);
+
+		lv1_get_logical_ppe_id(&pd->ppe_id);
+		pd->thread_id = get_hard_smp_processor_id(cpu);
+		spin_lock_init(&pd->bmp_lock);
+
+		DBG("%s:%d: ppe_id %llu, thread_id %llu, bmp %lxh\n",
+			__func__, __LINE__, pd->ppe_id, pd->thread_id,
+			ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
+
+		result = lv1_configure_irq_state_bitmap(pd->ppe_id,
+			pd->thread_id, ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
+
+		if (result)
+			FAIL("%s:%d: lv1_configure_irq_state_bitmap failed:"
+				" %s\n", __func__, __LINE__,
+				ps3_result(result));
+	}
+
+	ppc_md.get_irq = ps3_get_irq;
+}
+
+void ps3_shutdown_IRQ(int cpu)
+{
+	int result;
+	u64 ppe_id;
+	u64 thread_id = get_hard_smp_processor_id(cpu);
+
+	lv1_get_logical_ppe_id(&ppe_id);
+	result = lv1_configure_irq_state_bitmap(ppe_id, thread_id, 0);
+
+	DBG("%s:%d: lv1_configure_irq_state_bitmap (%llu:%llu/%d) %s\n", __func__,
+		__LINE__, ppe_id, thread_id, cpu, ps3_result(result));
+}