arch/sparc/kernel/pci_msi.c - maze/linux - Git at Google

 /* pci_msi.c: Sparc64 MSI support common layer.
  *
  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
  */
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/irq.h>

 #include "pci_impl.h"

 static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
 {
 	struct sparc64_msiq_cookie *msiq_cookie = cookie;
 	struct pci_pbm_info *pbm = msiq_cookie->pbm;
 	unsigned long msiqid = msiq_cookie->msiqid;
 	const struct sparc64_msiq_ops *ops;
 	unsigned long orig_head, head;
 	int err;

 	ops = pbm->msi_ops;

 	err = ops->get_head(pbm, msiqid, &head);
 	if (unlikely(err < 0))
 		goto err_get_head;

 	orig_head = head;
 	for (;;) {
 		unsigned long msi;

 		err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
 		if (likely(err > 0)) {
 			struct irq_desc *desc;
 			unsigned int irq;

 			irq = pbm->msi_irq_table[msi - pbm->msi_first];
 			desc = irq_desc + irq;

 			desc->handle_irq(irq, desc);
 		}

 		if (unlikely(err < 0))
 			goto err_dequeue;

 		if (err == 0)
 			break;
 	}
 	if (likely(head != orig_head)) {
 		err = ops->set_head(pbm, msiqid, head);
 		if (unlikely(err < 0))
 			goto err_set_head;
 	}
 	return IRQ_HANDLED;

 err_get_head:
 	printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
 	       msiqid, err);
 	goto err_out;

 err_dequeue:
 	printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
 	       "gives error %d\n",
 	       head, msiqid, err);
 	goto err_out;

 err_set_head:
 	printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
 	       "gives error %d\n",
 	       head, msiqid, err);
 	goto err_out;

 err_out:
 	return IRQ_NONE;
 }

 static u32 pick_msiq(struct pci_pbm_info *pbm)
 {
 	static DEFINE_SPINLOCK(rotor_lock);
 	unsigned long flags;
 	u32 ret, rotor;

 	spin_lock_irqsave(&rotor_lock, flags);

 	rotor = pbm->msiq_rotor;
 	ret = pbm->msiq_first + rotor;

 	if (++rotor >= pbm->msiq_num)
 		rotor = 0;
 	pbm->msiq_rotor = rotor;

 	spin_unlock_irqrestore(&rotor_lock, flags);

 	return ret;
 }


 static int alloc_msi(struct pci_pbm_info *pbm)
 {
 	int i;

 	for (i = 0; i < pbm->msi_num; i++) {
 		if (!test_and_set_bit(i, pbm->msi_bitmap))
 			return i + pbm->msi_first;
 	}

 	return -ENOENT;
 }

 static void free_msi(struct pci_pbm_info *pbm, int msi_num)
 {
 	msi_num -= pbm->msi_first;
 	clear_bit(msi_num, pbm->msi_bitmap);
 }

 static struct irq_chip msi_irq = {
 	.name		= "PCI-MSI",
 	.irq_mask	= mask_msi_irq,
 	.irq_unmask	= unmask_msi_irq,
 	.irq_enable	= unmask_msi_irq,
 	.irq_disable	= mask_msi_irq,
 	/* XXX affinity XXX */
 };

 static int sparc64_setup_msi_irq(unsigned int *irq_p,
 				 struct pci_dev *pdev,
 				 struct msi_desc *entry)
 {
 	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
 	const struct sparc64_msiq_ops *ops = pbm->msi_ops;
 	struct msi_msg msg;
 	int msi, err;
 	u32 msiqid;

 	*irq_p = irq_alloc(0, 0);
 	err = -ENOMEM;
 	if (!*irq_p)
 		goto out_err;

 	set_irq_chip_and_handler_name(*irq_p, &msi_irq,
 				      handle_simple_irq, "MSI");

 	err = alloc_msi(pbm);
 	if (unlikely(err < 0))
 		goto out_irq_free;

 	msi = err;

 	msiqid = pick_msiq(pbm);

 	err = ops->msi_setup(pbm, msiqid, msi,
 			     (entry->msi_attrib.is_64 ? 1 : 0));
 	if (err)
 		goto out_msi_free;

 	pbm->msi_irq_table[msi - pbm->msi_first] = *irq_p;

 	if (entry->msi_attrib.is_64) {
 		msg.address_hi = pbm->msi64_start >> 32;
 		msg.address_lo = pbm->msi64_start & 0xffffffff;
 	} else {
 		msg.address_hi = 0;
 		msg.address_lo = pbm->msi32_start;
 	}
 	msg.data = msi;

 	set_irq_msi(*irq_p, entry);
 	write_msi_msg(*irq_p, &msg);

 	return 0;

 out_msi_free:
 	free_msi(pbm, msi);

 out_irq_free:
 	set_irq_chip(*irq_p, NULL);
 	irq_free(*irq_p);
 	*irq_p = 0;

 out_err:
 	return err;
 }

 static void sparc64_teardown_msi_irq(unsigned int irq,
 				     struct pci_dev *pdev)
 {
 	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
 	const struct sparc64_msiq_ops *ops = pbm->msi_ops;
 	unsigned int msi_num;
 	int i, err;

 	for (i = 0; i < pbm->msi_num; i++) {
 		if (pbm->msi_irq_table[i] == irq)
 			break;
 	}
 	if (i >= pbm->msi_num) {
 		printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
 		       pbm->name, irq);
 		return;
 	}

 	msi_num = pbm->msi_first + i;
 	pbm->msi_irq_table[i] = ~0U;

 	err = ops->msi_teardown(pbm, msi_num);
 	if (err) {
 		printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
 		       "irq %u, gives error %d\n",
 		       pbm->name, msi_num, irq, err);
 		return;
 	}

 	free_msi(pbm, msi_num);

 	set_irq_chip(irq, NULL);
 	irq_free(irq);
 }

 static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
 {
 	unsigned long size, bits_per_ulong;

 	bits_per_ulong = sizeof(unsigned long) * 8;
 	size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
 	size /= 8;
 	BUG_ON(size % sizeof(unsigned long));

 	pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
 	if (!pbm->msi_bitmap)
 		return -ENOMEM;

 	return 0;
 }

 static void msi_bitmap_free(struct pci_pbm_info *pbm)
 {
 	kfree(pbm->msi_bitmap);
 	pbm->msi_bitmap = NULL;
 }

 static int msi_table_alloc(struct pci_pbm_info *pbm)
 {
 	int size, i;

 	size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
 	pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
 	if (!pbm->msiq_irq_cookies)
 		return -ENOMEM;

 	for (i = 0; i < pbm->msiq_num; i++) {
 		struct sparc64_msiq_cookie *p;

 		p = &pbm->msiq_irq_cookies[i];
 		p->pbm = pbm;
 		p->msiqid = pbm->msiq_first + i;
 	}

 	size = pbm->msi_num * sizeof(unsigned int);
 	pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
 	if (!pbm->msi_irq_table) {
 		kfree(pbm->msiq_irq_cookies);
 		pbm->msiq_irq_cookies = NULL;
 		return -ENOMEM;
 	}

 	return 0;
 }

 static void msi_table_free(struct pci_pbm_info *pbm)
 {
 	kfree(pbm->msiq_irq_cookies);
 	pbm->msiq_irq_cookies = NULL;

 	kfree(pbm->msi_irq_table);
 	pbm->msi_irq_table = NULL;
 }

 static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
 				 const struct sparc64_msiq_ops *ops,
 				 unsigned long msiqid,
 				 unsigned long devino)
 {
 	int irq = ops->msiq_build_irq(pbm, msiqid, devino);
 	int err, nid;

 	if (irq < 0)
 		return irq;

 	nid = pbm->numa_node;
 	if (nid != -1) {
 		cpumask_t numa_mask = *cpumask_of_node(nid);

 		irq_set_affinity(irq, &numa_mask);
 	}
 	err = request_irq(irq, sparc64_msiq_interrupt, 0,
 			  "MSIQ",
 			  &pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
 	if (err)
 		return err;

 	return 0;
 }

 static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
 				      const struct sparc64_msiq_ops *ops)
 {
 	int i;

 	for (i = 0; i < pbm->msiq_num; i++) {
 		unsigned long msiqid = i + pbm->msiq_first;
 		unsigned long devino = i + pbm->msiq_first_devino;
 		int err;

 		err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
 			  const struct sparc64_msiq_ops *ops)
 {
 	const u32 *val;
 	int len;

 	val = of_get_property(pbm->op->dev.of_node, "#msi-eqs", &len);
 	if (!val || len != 4)
 		goto no_msi;
 	pbm->msiq_num = *val;
 	if (pbm->msiq_num) {
 		const struct msiq_prop {
 			u32 first_msiq;
 			u32 num_msiq;
 			u32 first_devino;
 		} *mqp;
 		const struct msi_range_prop {
 			u32 first_msi;
 			u32 num_msi;
 		} *mrng;
 		const struct addr_range_prop {
 			u32 msi32_high;
 			u32 msi32_low;
 			u32 msi32_len;
 			u32 msi64_high;
 			u32 msi64_low;
 			u32 msi64_len;
 		} *arng;

 		val = of_get_property(pbm->op->dev.of_node, "msi-eq-size", &len);
 		if (!val || len != 4)
 			goto no_msi;

 		pbm->msiq_ent_count = *val;

 		mqp = of_get_property(pbm->op->dev.of_node,
 				      "msi-eq-to-devino", &len);
 		if (!mqp)
 			mqp = of_get_property(pbm->op->dev.of_node,
 					      "msi-eq-devino", &len);
 		if (!mqp || len != sizeof(struct msiq_prop))
 			goto no_msi;

 		pbm->msiq_first = mqp->first_msiq;
 		pbm->msiq_first_devino = mqp->first_devino;

 		val = of_get_property(pbm->op->dev.of_node, "#msi", &len);
 		if (!val || len != 4)
 			goto no_msi;
 		pbm->msi_num = *val;

 		mrng = of_get_property(pbm->op->dev.of_node, "msi-ranges", &len);
 		if (!mrng || len != sizeof(struct msi_range_prop))
 			goto no_msi;
 		pbm->msi_first = mrng->first_msi;

 		val = of_get_property(pbm->op->dev.of_node, "msi-data-mask", &len);
 		if (!val || len != 4)
 			goto no_msi;
 		pbm->msi_data_mask = *val;

 		val = of_get_property(pbm->op->dev.of_node, "msix-data-width", &len);
 		if (!val || len != 4)
 			goto no_msi;
 		pbm->msix_data_width = *val;

 		arng = of_get_property(pbm->op->dev.of_node, "msi-address-ranges",
 				       &len);
 		if (!arng || len != sizeof(struct addr_range_prop))
 			goto no_msi;
 		pbm->msi32_start = ((u64)arng->msi32_high << 32) |
 			(u64) arng->msi32_low;
 		pbm->msi64_start = ((u64)arng->msi64_high << 32) |
 			(u64) arng->msi64_low;
 		pbm->msi32_len = arng->msi32_len;
 		pbm->msi64_len = arng->msi64_len;

 		if (msi_bitmap_alloc(pbm))
 			goto no_msi;

 		if (msi_table_alloc(pbm)) {
 			msi_bitmap_free(pbm);
 			goto no_msi;
 		}

 		if (ops->msiq_alloc(pbm)) {
 			msi_table_free(pbm);
 			msi_bitmap_free(pbm);
 			goto no_msi;
 		}

 		if (sparc64_bringup_msi_queues(pbm, ops)) {
 			ops->msiq_free(pbm);
 			msi_table_free(pbm);
 			msi_bitmap_free(pbm);
 			goto no_msi;
 		}

 		printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
 		       "devino[0x%x]\n",
 		       pbm->name,
 		       pbm->msiq_first, pbm->msiq_num,
 		       pbm->msiq_ent_count,
 		       pbm->msiq_first_devino);
 		printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
 		       "width[%u]\n",
 		       pbm->name,
 		       pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
 		       pbm->msix_data_width);
 		printk(KERN_INFO "%s: MSI addr32[0x%llx:0x%x] "
 		       "addr64[0x%llx:0x%x]\n",
 		       pbm->name,
 		       pbm->msi32_start, pbm->msi32_len,
 		       pbm->msi64_start, pbm->msi64_len);
 		printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
 		       pbm->name,
 		       __pa(pbm->msi_queues));

 		pbm->msi_ops = ops;
 		pbm->setup_msi_irq = sparc64_setup_msi_irq;
 		pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
 	}
 	return;

 no_msi:
 	pbm->msiq_num = 0;
 	printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
 }
	/* pci_msi.c: Sparc64 MSI support common layer.
	*
	* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
	*/
	#include <linux/kernel.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/irq.h>

	#include "pci_impl.h"

	static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
	{
	struct sparc64_msiq_cookie *msiq_cookie = cookie;
	struct pci_pbm_info *pbm = msiq_cookie->pbm;
	unsigned long msiqid = msiq_cookie->msiqid;
	const struct sparc64_msiq_ops *ops;
	unsigned long orig_head, head;
	int err;

	ops = pbm->msi_ops;

	err = ops->get_head(pbm, msiqid, &head);
	if (unlikely(err < 0))
	goto err_get_head;

	orig_head = head;
	for (;;) {
	unsigned long msi;

	err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
	if (likely(err > 0)) {
	struct irq_desc *desc;
	unsigned int irq;

	irq = pbm->msi_irq_table[msi - pbm->msi_first];
	desc = irq_desc + irq;

	desc->handle_irq(irq, desc);
	}

	if (unlikely(err < 0))
	goto err_dequeue;

	if (err == 0)
	break;
	}
	if (likely(head != orig_head)) {
	err = ops->set_head(pbm, msiqid, head);
	if (unlikely(err < 0))
	goto err_set_head;
	}
	return IRQ_HANDLED;

	err_get_head:
	printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
	msiqid, err);
	goto err_out;

	err_dequeue:
	printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
	"gives error %d\n",
	head, msiqid, err);
	goto err_out;

	err_set_head:
	printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
	"gives error %d\n",
	head, msiqid, err);
	goto err_out;

	err_out:
	return IRQ_NONE;
	}

	static u32 pick_msiq(struct pci_pbm_info *pbm)
	{
	static DEFINE_SPINLOCK(rotor_lock);
	unsigned long flags;
	u32 ret, rotor;

	spin_lock_irqsave(&rotor_lock, flags);

	rotor = pbm->msiq_rotor;
	ret = pbm->msiq_first + rotor;

	if (++rotor >= pbm->msiq_num)
	rotor = 0;
	pbm->msiq_rotor = rotor;

	spin_unlock_irqrestore(&rotor_lock, flags);

	return ret;
	}


	static int alloc_msi(struct pci_pbm_info *pbm)
	{
	int i;

	for (i = 0; i < pbm->msi_num; i++) {
	if (!test_and_set_bit(i, pbm->msi_bitmap))
	return i + pbm->msi_first;
	}

	return -ENOENT;
	}

	static void free_msi(struct pci_pbm_info *pbm, int msi_num)
	{
	msi_num -= pbm->msi_first;
	clear_bit(msi_num, pbm->msi_bitmap);
	}

	static struct irq_chip msi_irq = {
	.name = "PCI-MSI",
	.irq_mask = mask_msi_irq,
	.irq_unmask = unmask_msi_irq,
	.irq_enable = unmask_msi_irq,
	.irq_disable = mask_msi_irq,
	/* XXX affinity XXX */
	};

	static int sparc64_setup_msi_irq(unsigned int *irq_p,
	struct pci_dev *pdev,
	struct msi_desc *entry)
	{
	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
	const struct sparc64_msiq_ops *ops = pbm->msi_ops;
	struct msi_msg msg;
	int msi, err;
	u32 msiqid;

	*irq_p = irq_alloc(0, 0);
	err = -ENOMEM;
	if (!*irq_p)
	goto out_err;

	set_irq_chip_and_handler_name(*irq_p, &msi_irq,
	handle_simple_irq, "MSI");

	err = alloc_msi(pbm);
	if (unlikely(err < 0))
	goto out_irq_free;

	msi = err;

	msiqid = pick_msiq(pbm);

	err = ops->msi_setup(pbm, msiqid, msi,
	(entry->msi_attrib.is_64 ? 1 : 0));
	if (err)
	goto out_msi_free;

	pbm->msi_irq_table[msi - pbm->msi_first] = *irq_p;

	if (entry->msi_attrib.is_64) {
	msg.address_hi = pbm->msi64_start >> 32;
	msg.address_lo = pbm->msi64_start & 0xffffffff;
	} else {
	msg.address_hi = 0;
	msg.address_lo = pbm->msi32_start;
	}
	msg.data = msi;

	set_irq_msi(*irq_p, entry);
	write_msi_msg(*irq_p, &msg);

	return 0;

	out_msi_free:
	free_msi(pbm, msi);

	out_irq_free:
	set_irq_chip(*irq_p, NULL);
	irq_free(*irq_p);
	*irq_p = 0;

	out_err:
	return err;
	}

	static void sparc64_teardown_msi_irq(unsigned int irq,
	struct pci_dev *pdev)
	{
	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
	const struct sparc64_msiq_ops *ops = pbm->msi_ops;
	unsigned int msi_num;
	int i, err;

	for (i = 0; i < pbm->msi_num; i++) {
	if (pbm->msi_irq_table[i] == irq)
	break;
	}
	if (i >= pbm->msi_num) {
	printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
	pbm->name, irq);
	return;
	}

	msi_num = pbm->msi_first + i;
	pbm->msi_irq_table[i] = ~0U;

	err = ops->msi_teardown(pbm, msi_num);
	if (err) {
	printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
	"irq %u, gives error %d\n",
	pbm->name, msi_num, irq, err);
	return;
	}

	free_msi(pbm, msi_num);

	set_irq_chip(irq, NULL);
	irq_free(irq);
	}

	static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
	{
	unsigned long size, bits_per_ulong;

	bits_per_ulong = sizeof(unsigned long) * 8;
	size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
	size /= 8;
	BUG_ON(size % sizeof(unsigned long));

	pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
	if (!pbm->msi_bitmap)
	return -ENOMEM;

	return 0;
	}

	static void msi_bitmap_free(struct pci_pbm_info *pbm)
	{
	kfree(pbm->msi_bitmap);
	pbm->msi_bitmap = NULL;
	}

	static int msi_table_alloc(struct pci_pbm_info *pbm)
	{
	int size, i;

	size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
	pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
	if (!pbm->msiq_irq_cookies)
	return -ENOMEM;

	for (i = 0; i < pbm->msiq_num; i++) {
	struct sparc64_msiq_cookie *p;

	p = &pbm->msiq_irq_cookies[i];
	p->pbm = pbm;
	p->msiqid = pbm->msiq_first + i;
	}

	size = pbm->msi_num * sizeof(unsigned int);
	pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
	if (!pbm->msi_irq_table) {
	kfree(pbm->msiq_irq_cookies);
	pbm->msiq_irq_cookies = NULL;
	return -ENOMEM;
	}

	return 0;
	}

	static void msi_table_free(struct pci_pbm_info *pbm)
	{
	kfree(pbm->msiq_irq_cookies);
	pbm->msiq_irq_cookies = NULL;

	kfree(pbm->msi_irq_table);
	pbm->msi_irq_table = NULL;
	}

	static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
	const struct sparc64_msiq_ops *ops,
	unsigned long msiqid,
	unsigned long devino)
	{
	int irq = ops->msiq_build_irq(pbm, msiqid, devino);
	int err, nid;

	if (irq < 0)
	return irq;

	nid = pbm->numa_node;
	if (nid != -1) {
	cpumask_t numa_mask = *cpumask_of_node(nid);

	irq_set_affinity(irq, &numa_mask);
	}
	err = request_irq(irq, sparc64_msiq_interrupt, 0,
	"MSIQ",
	&pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
	if (err)
	return err;

	return 0;
	}

	static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
	const struct sparc64_msiq_ops *ops)
	{
	int i;

	for (i = 0; i < pbm->msiq_num; i++) {
	unsigned long msiqid = i + pbm->msiq_first;
	unsigned long devino = i + pbm->msiq_first_devino;
	int err;

	err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
	if (err)
	return err;
	}

	return 0;
	}

	void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
	const struct sparc64_msiq_ops *ops)
	{
	const u32 *val;
	int len;

	val = of_get_property(pbm->op->dev.of_node, "#msi-eqs", &len);
	if (!val \|\| len != 4)
	goto no_msi;
	pbm->msiq_num = *val;
	if (pbm->msiq_num) {
	const struct msiq_prop {
	u32 first_msiq;
	u32 num_msiq;
	u32 first_devino;
	} *mqp;
	const struct msi_range_prop {
	u32 first_msi;
	u32 num_msi;
	} *mrng;
	const struct addr_range_prop {
	u32 msi32_high;
	u32 msi32_low;
	u32 msi32_len;
	u32 msi64_high;
	u32 msi64_low;
	u32 msi64_len;
	} *arng;

	val = of_get_property(pbm->op->dev.of_node, "msi-eq-size", &len);
	if (!val \|\| len != 4)
	goto no_msi;

	pbm->msiq_ent_count = *val;

	mqp = of_get_property(pbm->op->dev.of_node,
	"msi-eq-to-devino", &len);
	if (!mqp)
	mqp = of_get_property(pbm->op->dev.of_node,
	"msi-eq-devino", &len);
	if (!mqp \|\| len != sizeof(struct msiq_prop))
	goto no_msi;

	pbm->msiq_first = mqp->first_msiq;
	pbm->msiq_first_devino = mqp->first_devino;

	val = of_get_property(pbm->op->dev.of_node, "#msi", &len);
	if (!val \|\| len != 4)
	goto no_msi;
	pbm->msi_num = *val;

	mrng = of_get_property(pbm->op->dev.of_node, "msi-ranges", &len);
	if (!mrng \|\| len != sizeof(struct msi_range_prop))
	goto no_msi;
	pbm->msi_first = mrng->first_msi;

	val = of_get_property(pbm->op->dev.of_node, "msi-data-mask", &len);
	if (!val \|\| len != 4)
	goto no_msi;
	pbm->msi_data_mask = *val;

	val = of_get_property(pbm->op->dev.of_node, "msix-data-width", &len);
	if (!val \|\| len != 4)
	goto no_msi;
	pbm->msix_data_width = *val;

	arng = of_get_property(pbm->op->dev.of_node, "msi-address-ranges",
	&len);
	if (!arng \|\| len != sizeof(struct addr_range_prop))
	goto no_msi;
	pbm->msi32_start = ((u64)arng->msi32_high << 32) \|
	(u64) arng->msi32_low;
	pbm->msi64_start = ((u64)arng->msi64_high << 32) \|
	(u64) arng->msi64_low;
	pbm->msi32_len = arng->msi32_len;
	pbm->msi64_len = arng->msi64_len;

	if (msi_bitmap_alloc(pbm))
	goto no_msi;

	if (msi_table_alloc(pbm)) {
	msi_bitmap_free(pbm);
	goto no_msi;
	}

	if (ops->msiq_alloc(pbm)) {
	msi_table_free(pbm);
	msi_bitmap_free(pbm);
	goto no_msi;
	}

	if (sparc64_bringup_msi_queues(pbm, ops)) {
	ops->msiq_free(pbm);
	msi_table_free(pbm);
	msi_bitmap_free(pbm);
	goto no_msi;
	}

	printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
	"devino[0x%x]\n",
	pbm->name,
	pbm->msiq_first, pbm->msiq_num,
	pbm->msiq_ent_count,
	pbm->msiq_first_devino);
	printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
	"width[%u]\n",
	pbm->name,
	pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
	pbm->msix_data_width);
	printk(KERN_INFO "%s: MSI addr32[0x%llx:0x%x] "
	"addr64[0x%llx:0x%x]\n",
	pbm->name,
	pbm->msi32_start, pbm->msi32_len,
	pbm->msi64_start, pbm->msi64_len);
	printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
	pbm->name,
	__pa(pbm->msi_queues));

	pbm->msi_ops = ops;
	pbm->setup_msi_irq = sparc64_setup_msi_irq;
	pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
	}
	return;

	no_msi:
	pbm->msiq_num = 0;
	printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
	}