cregit-Linux how code gets into the kernel

Release 4.12 drivers/pci/msi.c

Directory: drivers/pci
/*
 * File:        msi.c
 * Purpose:     PCI Message Signaled Interrupt (MSI)
 *
 * Copyright (C) 2003-2004 Intel
 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
 * Copyright (C) 2016 Christoph Hellwig.
 */

#include <linux/err.h>
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/export.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/msi.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/acpi_iort.h>
#include <linux/slab.h>
#include <linux/irqdomain.h>
#include <linux/of_irq.h>

#include "pci.h"


static int pci_msi_enable = 1;

int pci_msi_ignore_mask;


#define msix_table_size(flags)	((flags & PCI_MSIX_FLAGS_QSIZE) + 1)

#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN



static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
	struct irq_domain *domain;

	domain = dev_get_msi_domain(&dev->dev);
	if (domain && irq_domain_is_hierarchy(domain))
		return msi_domain_alloc_irqs(domain, &dev->dev, nvec);

	return arch_setup_msi_irqs(dev, nvec, type);
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu5179.69%125.00%


Christoph Hellwig812.50%250.00%


Marc Zyngier57.81%125.00%


Total64100.00%4100.00%






static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
{
	struct irq_domain *domain;

	domain = dev_get_msi_domain(&dev->dev);
	if (domain && irq_domain_is_hierarchy(domain))
		msi_domain_free_irqs(domain, &dev->dev);
	else
		arch_teardown_msi_irqs(dev);
}

Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu3874.51%125.00%


Christoph Hellwig815.69%250.00%


Marc Zyngier59.80%125.00%


Total51100.00%4100.00%



#else

#define pci_msi_setup_msi_irqs		arch_setup_msi_irqs

#define pci_msi_teardown_msi_irqs	arch_teardown_msi_irqs
#endif

/* Arch hooks */




int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
	struct msi_controller *chip = dev->bus->msi;
	int err;

	if (!chip || !chip->setup_irq)
		return -EINVAL;

	err = chip->setup_irq(chip, dev, desc);
	if (err < 0)
		return err;

	irq_set_chip_data(desc->irq, chip);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Thierry Reding5367.95%125.00%


Thomas Petazzoni2025.64%125.00%


Lorenzo Pieralisi45.13%125.00%


Yijing Wang11.28%125.00%


Total78100.00%4100.00%






void __weak arch_teardown_msi_irq(unsigned int irq)
{
	struct msi_controller *chip = irq_get_chip_data(irq);

	if (!chip || !chip->teardown_irq)
		return;

	chip->teardown_irq(chip, irq);
}


Contributors
PersonTokensPropCommitsCommitProp
Thierry Reding3177.50%133.33%


Thomas Petazzoni820.00%133.33%


Yijing Wang12.50%133.33%


Total40100.00%3100.00%






int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
	struct msi_controller *chip = dev->bus->msi;
	struct msi_desc *entry;
	int ret;

	if (chip && chip->setup_irqs)
		return chip->setup_irqs(chip, dev, nvec, type);
	/*
         * If an architecture wants to support multiple MSI, it needs to
         * override arch_setup_msi_irqs()
         */
	if (type == PCI_CAP_ID_MSI && nvec > 1)
		return 1;

	for_each_pci_msi_entry(entry, dev) {
		ret = arch_setup_msi_irq(dev, entry);
		if (ret < 0)
			return ret;
		if (ret > 0)
			return -ENOSPC;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Adrian Bunk4136.94%114.29%


Lucas Stach3329.73%114.29%


Michael Ellerman1917.12%228.57%


Matthew Wilcox1412.61%114.29%


Jiang Liu21.80%114.29%


Thomas Petazzoni21.80%114.29%


Total111100.00%7100.00%



/*
 * We have a default implementation available as a separate non-weak
 * function, as it is used by the Xen x86 PCI code
 */



void default_teardown_msi_irqs(struct pci_dev *dev)
{
	int i;
	struct msi_desc *entry;

	for_each_pci_msi_entry(entry, dev)
		if (entry->irq)
			for (i = 0; i < entry->nvec_used; i++)
				arch_teardown_msi_irq(entry->irq + i);
}


Contributors
PersonTokensPropCommitsCommitProp
Adrian Bunk2648.15%116.67%


Matthew Wilcox1425.93%116.67%


Jiang Liu814.81%233.33%


Michael Ellerman59.26%116.67%


Thomas Gleixner11.85%116.67%


Total54100.00%6100.00%






void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
{
	return default_teardown_msi_irqs(dev);
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Petazzoni17100.00%1100.00%


Total17100.00%1100.00%






static void default_restore_msi_irq(struct pci_dev *dev, int irq)
{
	struct msi_desc *entry;

	entry = NULL;
	if (dev->msix_enabled) {
		for_each_pci_msi_entry(entry, dev) {
			if (irq == entry->irq)
				break;
		}
	} else if (dev->msi_enabled)  {
		entry = irq_get_msi_desc(irq);
	}

	if (entry)
		__pci_write_msi_msg(entry, &entry->msg);
}


Contributors
PersonTokensPropCommitsCommitProp
Konrad Rzeszutek Wilk7292.31%120.00%


Jiang Liu33.85%240.00%


Duan Zhenzhong22.56%120.00%


Yijing Wang11.28%120.00%


Total78100.00%5100.00%






void __weak arch_restore_msi_irqs(struct pci_dev *dev)
{
	return default_restore_msi_irqs(dev);
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Petazzoni17100.00%1100.00%


Total17100.00%1100.00%






static inline __attribute_const__ u32 msi_mask(unsigned x)
{
	/* Don't shift by >= width of type */
	if (x >= 5)
		return 0xffffffff;
	return (1 << (1 << x)) - 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox34100.00%2100.00%


Total34100.00%2100.00%



/*
 * PCI 2.3 does not specify mask bits for each MSI interrupt.  Attempting to
 * mask all MSI interrupts by clearing the MSI enable bit does not work
 * reliably as devices without an INTx disable bit will then generate a
 * level IRQ which will never be cleared.
 */



u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
{
	u32 mask_bits = desc->masked;

	if (pci_msi_ignore_mask || !desc->msi_attrib.maskbit)
		return 0;

	mask_bits &= ~mask;
	mask_bits |= flag;
	pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->mask_pos,
			       mask_bits);

	return mask_bits;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox3758.73%225.00%


Hidetoshi Seto812.70%112.50%


Mitch A Williams812.70%112.50%


Yinghai Lu46.35%112.50%


Jiang Liu34.76%112.50%


Yijing Wang23.17%112.50%


Thomas Gleixner11.59%112.50%


Total63100.00%8100.00%






static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
{
	desc->masked = __pci_msi_desc_mask_irq(desc, mask, flag);
}


Contributors
PersonTokensPropCommitsCommitProp
Hidetoshi Seto2376.67%133.33%


Matthew Wilcox620.00%133.33%


Thomas Gleixner13.33%133.33%


Total30100.00%3100.00%






static void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
{
	return desc->mask_base +
		desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
}


Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig26100.00%1100.00%


Total26100.00%1100.00%



/*
 * This internal function does not flush PCI writes to the device.
 * All users must ensure that they read from the device before either
 * assuming that the device state is up to date, or returning out of this
 * file.  This saves a few milliseconds when initialising devices with lots
 * of MSI-X interrupts.
 */



u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag)
{
	u32 mask_bits = desc->masked;

	if (pci_msi_ignore_mask)
		return 0;

	mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
	if (flag)
		mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
	writel(mask_bits, pci_msix_desc_addr(desc) + PCI_MSIX_ENTRY_VECTOR_CTRL);

	return mask_bits;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox2749.09%114.29%


Yijing Wang712.73%114.29%


Sheng Yang610.91%114.29%


Mitch A Williams59.09%114.29%


Hidetoshi Seto59.09%114.29%


Christoph Hellwig47.27%114.29%


Thomas Gleixner11.82%114.29%


Total55100.00%7100.00%






static void msix_mask_irq(struct msi_desc *desc, u32 flag)
{
	desc->masked = __pci_msix_desc_mask_irq(desc, flag);
}


Contributors
PersonTokensPropCommitsCommitProp
Hidetoshi Seto1872.00%125.00%


Matthew Wilcox520.00%125.00%


Mitch A Williams14.00%125.00%


Thomas Gleixner14.00%125.00%


Total25100.00%4100.00%






static void msi_set_mask_bit(struct irq_data *data, u32 flag)
{
	struct msi_desc *desc = irq_data_get_msi_desc(data);

	if (desc->msi_attrib.is_msix) {
		msix_mask_irq(desc, flag);
		readl(desc->mask_base);		/* Flush write to device */
	} else {
		unsigned offset = data->irq - desc->irq;
		msi_mask_irq(desc, 1 << offset, flag << offset);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox4356.58%333.33%


Andrew Morton2026.32%111.11%


Thomas Gleixner79.21%111.11%


Yinghai Lu33.95%222.22%


Eric W. Biedermann22.63%111.11%


Jiang Liu11.32%111.11%


Total76100.00%9100.00%



/**
 * pci_msi_mask_irq - Generic irq chip callback to mask PCI/MSI interrupts
 * @data:       pointer to irqdata associated to that interrupt
 */



void pci_msi_mask_irq(struct irq_data *data)
{
	msi_set_mask_bit(data, 1);
}

Contributors
PersonTokensPropCommitsCommitProp
Thomas Gleixner635.29%250.00%


Matthew Wilcox635.29%125.00%


Andrew Morton529.41%125.00%


Total17100.00%4100.00%




EXPORT_SYMBOL_GPL(pci_msi_mask_irq);

/**
 * pci_msi_unmask_irq - Generic irq chip callback to unmask PCI/MSI interrupts
 * @data:       pointer to irqdata associated to that interrupt
 */



void pci_msi_unmask_irq(struct irq_data *data)
{
	msi_set_mask_bit(data, 0);
}

Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox952.94%120.00%


Thomas Gleixner635.29%240.00%


Andrew Morton15.88%120.00%


Eric W. Biedermann15.88%120.00%


Total17100.00%5100.00%




EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);




void default_restore_msi_irqs(struct pci_dev *dev)
{
	struct msi_desc *entry;

	for_each_pci_msi_entry(entry, dev)
		default_restore_msi_irq(dev, entry->irq);
}


Contributors
PersonTokensPropCommitsCommitProp
Duan Zhenzhong2893.33%150.00%


Jiang Liu26.67%150.00%


Total30100.00%2100.00%






void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
	struct pci_dev *dev = msi_desc_to_pci_dev(entry);

	BUG_ON(dev->current_state != PCI_D0);

	if (entry->msi_attrib.is_msix) {
		void __iomem *base = pci_msix_desc_addr(entry);

		msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR);
		msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
		msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
	} else {
		int pos = dev->msi_cap;
		u16 data;

		pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
				      &msg->address_lo);
		if (entry->msi_attrib.is_64) {
			pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
					      &msg->address_hi);
			pci_read_config_word(dev, pos + PCI_MSI_DATA_64, &data);
		} else {
			msg->address_hi = 0;
			pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data);
		}
		msg->data = data;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Ben Hutchings14079.10%19.09%


Jiang Liu116.21%218.18%


Björn Helgaas105.65%327.27%


Eric W. Biedermann73.95%19.09%


Christoph Hellwig31.69%19.09%


Yinghai Lu21.13%19.09%


Thomas Gleixner21.13%19.09%


Andrew Morton21.13%19.09%


Total177100.00%11100.00%






void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
	struct pci_dev *dev = msi_desc_to_pci_dev(entry);

	if (dev->current_state != PCI_D0 || pci_dev_is_disconnected(dev)) {
		/* Don't touch the hardware now */
	} else if (entry->msi_attrib.is_msix) {
		void __iomem *base = pci_msix_desc_addr(entry);

		writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
		writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
		writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
	} else {
		int pos = dev->msi_cap;
		u16 msgctl;

		pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
		msgctl &= ~PCI_MSI_FLAGS_QSIZE;
		msgctl |= entry->msi_attrib.multiple << 4;
		pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);

		pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
				       msg->address_lo);
		if (entry->msi_attrib.is_64) {
			pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
					       msg->address_hi);
			pci_write_config_word(dev, pos + PCI_MSI_DATA_64,
					      msg->data);
		} else {
			pci_write_config_word(dev, pos + PCI_MSI_DATA_32,
					      msg->data);
		}
	}
	entry->msg = *msg;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox8137.16%314.29%


Eric W. Biedermann4822.02%29.52%


Björn Helgaas146.42%419.05%


Ben Hutchings146.42%14.76%


Andrew Morton125.50%14.76%


Yinghai Lu115.05%14.76%


Jiang Liu115.05%29.52%


Mark Maule73.21%14.76%


Keith Busch52.29%14.76%


Christoph Hellwig52.29%14.76%


Ashok Raj41.83%14.76%


Hidetoshi Seto31.38%14.76%


Thomas Gleixner20.92%14.76%


Mitch A Williams10.46%14.76%


Total218100.00%21100.00%






void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
{
	struct msi_desc *entry = irq_get_msi_desc(irq);

	__pci_write_msi_msg(entry, msg);
}

Contributors
PersonTokensPropCommitsCommitProp
Andrew Morton929.03%112.50%


Matthew Wilcox619.35%112.50%


Yinghai Lu619.35%112.50%


Thomas Gleixner412.90%225.00%


Mitch A Williams26.45%112.50%


Eric W. Biedermann26.45%112.50%


Jiang Liu26.45%112.50%


Total31100.00%8100.00%




EXPORT_SYMBOL_GPL(pci_write_msi_msg);




static void free_msi_irqs(struct pci_dev *dev)
{
	struct list_head *msi_list = dev_to_msi_list(&dev->dev);
	struct msi_desc *entry, *tmp;
	struct attribute **msi_attrs;
	struct device_attribute *dev_attr;
	int i, count = 0;

	for_each_pci_msi_entry(entry, dev)
		if (entry->irq)
			for (i = 0; i < entry->nvec_used; i++)
				BUG_ON(irq_has_action(entry->irq + i));

	pci_msi_teardown_msi_irqs(dev);

	list_for_each_entry_safe(entry, tmp, msi_list, list) {
		if (entry->msi_attrib.is_msix) {
			if (list_is_last(&entry->list, msi_list))
				iounmap(entry->mask_base);
		}

		list_del(&entry->list);
		free_msi_entry(entry);
	}

	if (dev->msi_irq_groups) {
		sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
		msi_attrs = dev->msi_irq_groups[0]->attrs;
		while (msi_attrs[count]) {
			dev_attr = container_of(msi_attrs[count],
						struct device_attribute, attr);
			kfree(dev_attr->attr.name);
			kfree(dev_attr);
			++count;
		}
		kfree(msi_attrs);
		kfree(dev->msi_irq_groups[0]);
		kfree(dev->msi_irq_groups);
		dev->msi_irq_groups = NULL;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman11144.40%112.50%


Hidetoshi Seto10240.80%112.50%


Jiang Liu228.80%337.50%


Roland Dreier72.80%112.50%


Alexei Starovoitov72.80%112.50%


Prarit Bhargava10.40%112.50%


Total250100.00%8100.00%






static void pci_intx_for_msi(struct pci_dev *dev, int enable)
{
	if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
		pci_intx(dev, enable);
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller32100.00%1100.00%


Total32100.00%1100.00%






static void __pci_restore_msi_state(struct pci_dev *dev)
{
	u16 control;
	struct msi_desc *entry;

	if (!dev->msi_enabled)
		return;

	entry = irq_get_msi_desc(dev->irq);

	pci_intx_for_msi(dev, 0);
	pci_msi_set_enable(dev, 0);
	arch_restore_msi_irqs(dev);

	pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
	msi_mask_irq(entry, msi_mask(entry->msi_attrib.multi_cap),
		     entry->masked);
	control &= ~PCI_MSI_FLAGS_QSIZE;
	control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
	pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric W. Biedermann6252.10%426.67%


Matthew Wilcox2218.49%213.33%


Michael Ellerman119.24%16.67%


Mark Maule75.88%16.67%


Yijing Wang65.04%16.67%


Björn Helgaas65.04%16.67%


David Shaohua Li10.84%16.67%


Thomas Gleixner10.84%16.67%


David S. Miller10.84%16.67%


Michael S. Tsirkin10.84%16.67%


Konrad Rzeszutek Wilk10.84%16.67%


Total119100.00%15100.00%






static void __pci_restore_msix_state(struct pci_dev *dev)
{
	struct msi_desc *entry;

	if (!dev->msix_enabled)
		return;
	BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));

	/* route the table */
	pci_intx_for_msi(dev, 0);
	pci_msix_clear_and_set_ctrl(dev, 0,
				PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);

	arch_restore_msi_irqs(dev);
	for_each_pci_msi_entry(entry, dev)
		msix_mask_irq(entry, entry->masked);

	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox2630.23%110.00%


David Shaohua Li1719.77%110.00%


Michael Ellerman1213.95%220.00%


Eric W. Biedermann1213.95%220.00%


Jiang Liu66.98%110.00%


Yijing Wang66.98%110.00%


Duan Zhenzhong55.81%110.00%


Michael S. Tsirkin22.33%110.00%


Total86100.00%10100.00%






void pci_restore_msi_state(struct pci_dev *dev)
{
	__pci_restore_msi_state(dev);
	__pci_restore_msix_state(dev);
}

Contributors
PersonTokensPropCommitsCommitProp
Michael Ellerman20100.00%1100.00%


Total20100.00%1100.00%




EXPORT_SYMBOL_GPL(pci_restore_msi_state);




static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct msi_desc *entry;
	unsigned long irq;
	int retval;

	retval = kstrtoul(attr->attr.name, 10, &irq);
	if (retval)
		return retval;

	entry = irq_get_msi_desc(irq);
	if (entry)
		return sprintf(buf, "%s\n",
				entry->msi_attrib.is_msix ? "msix" : "msi");

	return -ENODEV;
}


Contributors
PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman4753.41%133.33%


Neil Horman3640.91%133.33%


Yijing Wang55.68%133.33%


Total88100.00%3100.00%






static int populate_msi_sysfs(struct pci_dev *pdev)
{
	struct attribute **msi_attrs;
	struct attribute *msi_attr;
	struct device_attribute *msi_dev_attr;
	struct attribute_group *msi_irq_group;
	const struct attribute_group **msi_irq_groups;
	struct msi_desc *entry;
	int ret = -ENOMEM;
	int num_msi = 0;
	int count = 0;
	int i;

	/* Determine how many msi entries we have */
	for_each_pci_msi_entry(entry, pdev)
		num_msi += entry->nvec_used;
	if (!num_msi)
		return 0;

	/* Dynamically create the MSI attributes for the PCI device */
	msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL);
	if (!msi_attrs)
		return -ENOMEM;
	for_each_pci_msi_entry(entry, pdev) {
		for (i = 0; i < entry->nvec_used; i++) {
			msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
			if (!msi_dev_attr)
				goto error_attrs;
			msi_attrs[count] = &msi_dev_attr->attr;

			sysfs_attr_init(&msi_dev_attr->attr);
			msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
							    entry->irq + i);
			if (!msi_dev_attr->attr.name)
				goto error_attrs;
			msi_dev_attr->attr.mode = S_IRUGO;
			msi_dev_attr->show = msi_mode_show;
			++count;
		}
	}

	msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);
	if (!msi_irq_group)
		goto error_attrs;
	msi_irq_group->name = "msi_irqs";
	msi_irq_group->attrs = msi_attrs;

	msi_irq_groups = kzalloc(sizeof(void *) * 2, GFP_KERNEL);
	if (!msi_irq_groups)
		goto error_irq_group;
	msi_irq_groups[0] = msi_irq_group;

	ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups);
	if (ret)
		goto error_irq_groups;
	pdev->msi_irq_groups = msi_irq_groups;

	return 0;

error_irq_groups:
	kfree(msi_irq_groups);
error_irq_group:
	kfree(msi_irq_group);
error_attrs:
	count = 0;
	msi_attr = msi_attrs[count];
	while (msi_attr) {
		msi_dev_attr = container_of(msi_attr, struct device_attribute, attr);
		kfree(msi_attr->name);
		kfree(msi_dev_attr);
		++count;
		msi_attr = msi_attrs[count];
	}
	kfree(msi_attrs);
	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman22557.25%233.33%


Neil Horman10727.23%116.67%


Jan Beulich307.63%116.67%


Romain Bezut287.12%116.67%


Jiang Liu30.76%116.67%


Total393100.00%6100.00%





static struct msi_desc *

msi_setup_entry(struct pci_dev *dev, int nvec, const struct irq_affinity *affd)
{
	struct cpumask *masks = NULL;
	struct msi_desc *entry;
	u16 control;

	if (affd) {
		masks = irq_create_affinity_masks(nvec, affd);
		if (!masks)
			dev_err(&dev->dev, "can't allocate MSI affinity masks for %d vectors\n",
				nvec);
	}

	/* MSI Entry Initialization */
	entry = alloc_msi_entry(&dev->dev, nvec, masks);
	if (!entry)
		goto out;

	pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);

	entry->msi_attrib.is_msix	= 0;
	entry->msi_attrib.is_64		= !!(control & PCI_MSI_FLAGS_64BIT);
	entry->msi_attrib.entry_nr	= 0;
	entry->msi_attrib.maskbit	= !!(control & PCI_MSI_FLAGS_MASKBIT);
	entry->msi_attrib.default_irq	= dev->irq;	/* Save IOAPIC IRQ */
	entry->msi_attrib.multi_cap	= (control & PCI_MSI_FLAGS_QMASK) >> 1;
	entry->msi_attrib.multiple	= ilog2(__roundup_pow_of_two(nvec));

	if (control & PCI_MSI_FLAGS_64BIT)
		entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
	else
		entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32;

	/* Save the initial mask status */
	if (entry->msi_attrib.maskbit)
		pci_read_config_dword(dev, entry->mask_pos, &entry->masked);

out:
	kfree(masks);
	return entry;
}


Contributors
PersonTokensPropCommitsCommitProp
Andrew Morton5220.88%14.00%


Thomas Gleixner4417.67%28.00%


Yijing Wang2911.65%28.00%


Björn Helgaas2610.44%416.00%


Jiang Liu208.03%28.00%


Eric W. Biedermann197.63%312.00%


Dan Carpenter166.43%14.00%


Matthew Wilcox156.02%28.00%


Christoph Hellwig104.02%28.00%


Hidetoshi Seto83.21%14.00%


Gavin Shan52.01%14.00%


Roland Dreier31.20%28.00%


Jike Song10.40%14.00%


David Shaohua Li10.40%14.00%


Total249100.00%25100.00%






static int msi_verify_entries(struct pci_dev *dev)
{
	struct msi_desc *entry;

	for_each_pci_msi_entry(entry, dev) {
		if (!dev->no_64bit_msi || !entry->msg.address_hi)
			continue;
		dev_err(&dev->dev, "Device has broken 64-bit MSI but arch"
			" tried to assign one above 4G\n");
		return -EIO;
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt5596.49%150.00%


Jiang Liu23.51%150.00%


Total57100.00%2100.00%



/**
 * msi_capability_init - configure device's MSI capability structure
 * @dev: pointer to the pci_dev data structure of MSI device function
 * @nvec: number of interrupts to allocate
 * @affd: description of automatic irq affinity assignments (may be %NULL)
 *
 * Setup the MSI capability structure of the device with the requested
 * number of interrupts.  A return value of zero indicates the successful
 * setup of an entry with the new MSI irq.  A negative return value indicates
 * an error, and a positive return value indicates the number of interrupts
 * which could have been allocated.
 */



static int msi_capability_init(struct pci_dev *dev, int nvec,
			       const struct irq_affinity *affd)
{
	struct msi_desc *entry;
	int ret;
	unsigned mask;

	pci_msi_set_enable(dev, 0);	/* Disable MSI during set up */

	entry = msi_setup_entry(dev, nvec, affd);
	if (!entry)
		return -ENOMEM;

	/* All MSIs are unmasked by default, Mask them all */
	mask = msi_mask(entry->msi_attrib.multi_cap);
	msi_mask_irq(entry, mask, mask);

	list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));

	/* Configure MSI capability structure */
	ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
	if (ret) {
		msi_mask_irq(entry, mask, ~mask);
		free_msi_irqs(dev);
		return ret;
	}

	ret = msi_verify_entries(dev);
	if (ret) {
		msi_mask_irq(entry, mask, ~mask);
		free_msi_irqs(dev);
		return ret;
	}

	ret = populate_msi_sysfs(dev);
	if (ret) {
		msi_mask_irq(entry, mask, ~mask);
		free_msi_irqs(dev);
		return ret;
	}

	/* Set MSI enabled bits  */
	pci_intx_for_msi(dev, 0);
	pci_msi_set_enable(dev, 1);
	dev->msi_enabled = 1;

	pcibios_free_irq(dev);
	dev->irq = entry->irq;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Yijing Wang5423.38%27.69%


Benjamin Herrenschmidt3113.42%13.85%


Neil Horman3113.42%13.85%


Eric W. Biedermann2912.55%415.38%


Michael Ellerman208.66%311.54%


Andrew Morton156.49%13.85%


Jiang Liu125.19%415.38%


Hidetoshi Seto114.76%27.69%


Mark Maule104.33%13.85%


Matthew Wilcox73.03%311.54%


Christoph Hellwig62.60%13.85%


Thomas Gleixner20.87%13.85%


Michael S. Tsirkin20.87%13.85%


David S. Miller10.43%13.85%


Total231100.00%26100.00%






static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
{
	resource_size_t phys_addr;
	u32 table_offset;
	unsigned long flags;
	u8 bir;

	pci_read_config_dword(dev, dev->msix_cap + PCI_MSIX_TABLE,
			      &table_offset);
	bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
	flags = pci_resource_flags(dev, bir);
	if (!flags || (flags & IORESOURCE_UNSET))
		return NULL;

	table_offset &= PCI_MSIX_TABLE_OFFSET;
	phys_addr = pci_resource_start(dev, bir) + table_offset;

	return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
}


Contributors
PersonTokensPropCommitsCommitProp
Hidetoshi Seto6765.69%116.67%


Yijing Wang2726.47%116.67%


Björn Helgaas43.92%233.33%


Gavin Shan32.94%116.67%


Kenji Kaneshige10.98%116.67%


Total102100.00%6100.00%






static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
			      struct msix_entry *entries, int nvec,
			      const struct irq_affinity *affd)
{
	struct cpumask *curmsk, *masks = NULL;
	struct msi_desc *entry;
	int ret, i;

	if (affd) {
		masks = irq_create_affinity_masks(nvec, affd);
		if (!masks)
			dev_err(&dev->dev, "can't allocate MSI-X affinity masks for %d vectors\n",
				nvec);
	}

	for (i = 0, curmsk = masks; i < nvec; i++) {
		entry = alloc_msi_entry(&dev->dev, 1, curmsk);
		if (!entry) {
			if (!i)
				iounmap(base);
			else
				free_msi_irqs(dev);
			/* No enough memory. Don't try again */
			ret = -ENOMEM;
			goto out;
		}

		entry->msi_attrib.is_msix	= 1;
		entry->msi_attrib.is_64		= 1;
		if (entries)
			entry->msi_attrib.entry_nr = entries[i].entry;
		else
			entry->msi_attrib.entry_nr = i;
		entry->msi_attrib.default_irq	= dev->irq;
		entry->mask_base		= base;

		list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
		if (masks)
			curmsk++;
	}
	ret = 0;
out:
	kfree(masks);
	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Hidetoshi Seto12350.83%19.09%


Thomas Gleixner5723.55%218.18%


Christoph Hellwig4518.60%436.36%


Björn Helgaas93.72%19.09%


Jiang Liu72.89%218.18%


Christophe Jaillet10.41%19.09%


Total242100.00%11100.00%






static void msix_program_entries(struct pci_dev *dev,
				 struct msix_entry *entries)
{
	struct msi_desc *entry;
	int i = 0;

	for_each_pci_msi_entry(entry, dev) {
		if (entries)
			entries[i++].vector = entry->irq;
		entry->masked = readl(pci_msix_desc_addr(entry) +
				PCI_MSIX_ENTRY_VECTOR_CTRL);
		msix_mask_irq(entry, 1);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Hidetoshi Seto6084.51%125.00%


Christoph Hellwig912.68%250.00%


Jiang Liu22.82%125.00%


Total71100.00%4100.00%



/**
 * msix_capability_init - configure device's MSI-X capability
 * @dev: pointer to the pci_dev data structure of MSI-X device function
 * @entries: pointer to an array of struct msix_entry entries
 * @nvec: number of @entries
 * @affd: Optional pointer to enable automatic affinity assignement
 *
 * Setup the MSI-X capability structure of device function with a
 * single MSI-X irq. A return of zero indicates the successful setup of
 * requested MSI-X entries with allocated irqs or non-zero for otherwise.
 **/



static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
				int nvec, const struct irq_affinity *affd)
{
	int ret;
	u16 control;
	void __iomem *base;

	/* Ensure MSI-X is disabled while it is set up */
	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);

	pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
	/* Request & Map MSI-X table region */
	base = msix_map_region(dev, msix_table_size(control));
	if (!base)
		return -ENOMEM;

	ret = msix_setup_entries(dev, base, entries, nvec, affd);
	if (ret)
		return ret;

	ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
	if (ret)
		goto out_avail;

	/* Check if all MSI entries honor device restrictions */
	ret = msi_verify_entries(dev);
	if (ret)
		goto out_free;

	/*
         * Some devices require MSI-X to be enabled before we can touch the
         * MSI-X registers.  We need to mask all the vectors to prevent
         * interrupts coming in before they're fully set up.
         */
	pci_msix_clear_and_set_ctrl(dev, 0,
				PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE);

	msix_program_entries(dev, entries);

	ret = populate_msi_sysfs(dev);
	if (ret)
		goto out_free;

	/* Set MSI-X enabled bits and unmask the function */
	pci_intx_for_msi(dev, 0);
	dev->msix_enabled = 1;
	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);

	pcibios_free_irq(dev);
	return 0;

out_avail:
	if (ret < 0) {
		/*
                 * If we had some success, report the number of irqs
                 * we succeeded in setting up.
                 */
		struct msi_desc *entry;
		int avail = 0;

		for_each_pci_msi_entry(entry, dev) {
			if (entry->irq != 0)
				avail++;
		}
		if (avail != 0)
			ret = avail;
	}

out_free:
	free_msi_irqs(dev);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Hidetoshi Seto7629.12%517.24%


Andrew Morton4416.86%13.45%


Matthew Wilcox3212.26%310.34%


Roland Dreier155.75%26.90%


Benjamin Herrenschmidt155.75%13.45%


Michael Ellerman145.36%26.90%


Neil Horman134.98%13.45%


Yijing Wang114.21%13.45%


Eric W. Biedermann93.45%26.90%


Jiang Liu83.07%310.34%


Christoph Hellwig62.30%13.45%


Alexander Gordeev51.92%13.45%


Grant Grundler31.15%13.45%


Michael S. Tsirkin31.15%13.45%


Gavin Shan31.15%13.45%


Thomas Gleixner20.77%13.45%


Björn Helgaas10.38%13.45%


Greg Kroah-Hartman10.38%13.45%


Total261100.00%29100.00%



/**
 * pci_msi_supported - check whether MSI may be enabled on a device
 * @dev: pointer to the pci_dev data structure of MSI device function
 * @nvec: how many MSIs have been requested ?
 *
 * Look at global flags, the device itself, and its parent buses
 * to determine if MSI/-X are supported for the device. If MSI/-X is
 * supported return 1, else return 0.
 **/



static int pci_msi_supported(struct pci_dev *dev, int nvec)
{
	struct pci_bus *bus;

	/* MSI must be globally enabled and supported by the device */
	if (!pci_msi_enable)
		return 0;

	if (!dev || dev->no_msi || dev->current_state != PCI_D0)
		return 0;

	/*
         * You can't ask to have 0 or less MSIs configured.
         *  a) it's stupid ..
         *  b) the list manipulation code assumes nvec >= 1.
         */
	if (nvec < 1)
		return 0;

	/*
         * Any bridge which does NOT route MSI transactions from its
         * secondary bus to its primary bus must set NO_MSI flag on
         * the secondary pci_bus.
         * We expect only arch-specific PCI host bus controller driver
         * or quirks for specific PCI bridges to be setting NO_MSI.
         */
	for (bus = dev->bus; bus; bus = bus->parent)
		if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
			return 0;

	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Brice Goglin2731.03%325.00%


Alexander Gordeev1719.54%216.67%


Andrew Morton1416.09%18.33%


Michael Ellerman1213.79%325.00%


Michael S. Tsirkin1011.49%18.33%


Kristen Carlson Accardi66.90%18.33%


Hidetoshi Seto11.15%18.33%


Total87100.00%12100.00%



/**
 * pci_msi_vec_count - Return the number of MSI vectors a device can send
 * @dev: device to report about
 *
 * This function returns the number of MSI vectors a device requested via
 * Multiple Message Capable register. It returns a negative errno if the
 * device is not capable sending MSI interrupts. Otherwise, the call succeeds
 * and returns a power of two, up to a maximum of 2^5 (32), according to the
 * MSI specification.
 **/



int pci_msi_vec_count(struct pci_dev *dev)
{
	int ret;
	u16 msgctl;

	if (!dev->msi_cap)
		return -EINVAL;

	pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
	ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);

	return ret;
}

Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox3560.34%125.00%


Brice Goglin1017.24%125.00%


Alexander Gordeev712.07%125.00%


Gavin Shan610.34%125.00%


Total58100.00%4100.00%




EXPORT_SYMBOL(pci_msi_vec_count);




static void pci_msi_shutdown(struct pci_dev *dev)
{
	struct msi_desc *desc;
	u32 mask;

	if (!pci_msi_enable || !dev || !dev->msi_enabled)
		return;

	BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
	desc = first_pci_msi_entry(dev);

	pci_msi_set_enable(dev, 0);
	pci_intx_for_msi(dev, 1);
	dev->msi_enabled = 0;

	/* Return the device with MSI unmasked as initial states */
	mask = msi_mask(desc->msi_attrib.multi_cap);
	/* Keep cached state to be restored */
	__pci_msi_desc_mask_irq(desc, mask, ~mask);

	/* Restore dev->irq to its default pin-assertion irq */
	dev->irq = desc->msi_attrib.default_irq;
	pcibios_alloc_irq(dev);
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox3026.55%314.29%


Yinghai Lu1815.93%314.29%


Andrew Morton1715.04%14.76%


Michael Ellerman1210.62%29.52%


Jiang Liu108.85%314.29%


Eric W. Biedermann97.96%314.29%


Yijing Wang65.31%14.76%


Roland Dreier65.31%14.76%


Hidetoshi Seto21.77%14.76%


Björn Helgaas10.88%14.76%


Thomas Gleixner10.88%14.76%


Michael S. Tsirkin10.88%14.76%


Total113100.00%21100.00%






void pci_disable_msi(struct pci_dev *dev)
{
	if (!pci_msi_enable || !dev || !dev->msi_enabled)
		return;

	pci_msi_shutdown(dev);
	free_msi_irqs(dev);
}

Contributors
PersonTokensPropCommitsCommitProp
Yinghai Lu2779.41%120.00%


Andrew Morton38.82%120.00%


Roland Dreier25.88%120.00%


Eric W. Biedermann12.94%120.00%


Hidetoshi Seto12.94%120.00%


Total34100.00%5100.00%




EXPORT_SYMBOL(pci_disable_msi);

/**
 * pci_msix_vec_count - return the number of device's MSI-X table entries
 * @dev: pointer to the pci_dev data structure of MSI-X device function
 * This function returns the number of device's MSI-X table entries and
 * therefore the number of MSI-X vectors device is capable of sending.
 * It returns a negative errno if the device is not capable of sending MSI-X
 * interrupts.
 **/



int pci_msix_vec_count(struct pci_dev *dev)
{
	u16 control;

	if (!dev->msix_cap)
		return -EINVAL;

	pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
	return msix_table_size(control);
}

Contributors
PersonTokensPropCommitsCommitProp
Rafael J. Wysocki3272.73%120.00%


Gavin Shan613.64%120.00%


Björn Helgaas36.82%240.00%


Alexander Gordeev36.82%120.00%


Total44100.00%5100.00%




EXPORT_SYMBOL(pci_msix_vec_count);




static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
			     int nvec, const struct irq_affinity *affd)
{
	int nr_entries;
	int i, j;

	if (!pci_msi_supported(dev, nvec))
		return -EINVAL;

	nr_entries = pci_msix_vec_count(dev);
	if (nr_entries < 0)
		return nr_entries;
	if (nvec > nr_entries)
		return nr_entries;

	if (entries) {
		/* Check for any invalid entries */
		for (i = 0; i < nvec; i++) {
			if (entries[i].entry >= nr_entries)
				return -EINVAL;		/* invalid entry */
			for (j = i + 1; j < nvec; j++) {
				if (entries[i].entry == entries[j].entry)
					return -EINVAL;	/* duplicate entry */
			}
		}
	}
	WARN_ON(!!dev->msix_enabled);

	/* Check whether driver already requested for MSI irq */
	if (dev->msi_enabled) {
		dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
		return -EINVAL;
	}
	return msix_capability_init(dev, entries, nvec, affd);
}


Contributors
PersonTokensPropCommitsCommitProp
Roland Dreier11760.94%210.53%


Eric W. Biedermann178.85%315.79%


Alexander Gordeev168.33%210.53%


Christoph Hellwig126.25%210.53%


Andrew Morton126.25%210.53%


Thomas Gleixner73.65%15.26%


Björn Helgaas63.12%210.53%


Michael Ellerman21.04%210.53%


Michael S. Tsirkin10.52%15.26%


Ryan Desfosses10.52%15.26%


Rafael J. Wysocki10.52%15.26%


Total192100.00%19100.00%






static void pci_msix_shutdown(struct pci_dev *dev)
{
	struct msi_desc *entry;

	if (!pci_msi_enable || !dev || !dev->msix_enabled)
		return;

	if (pci_dev_is_disconnected(dev)) {
		dev->msix_enabled = 0;
		return;
	}

	/* Return the device with MSI-X masked as initial states */
	for_each_pci_msi_entry(entry, dev) {
		/* Keep cached states to be restored */
		__pci_msix_desc_mask_irq(entry, 1);
	}

	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
	pci_intx_for_msi(dev, 1);
	dev->msix_enabled = 0;
	pcibios_alloc_irq(dev);
}


Contributors
PersonTokensPropCommitsCommitProp
Michael Ellerman4044.44%216.67%


Hidetoshi Seto1921.11%18.33%


Keith Busch1617.78%18.33%


Jiang Liu77.78%216.67%


Yinghai Lu22.22%18.33%


Yijing Wang22.22%18.33%


David S. Miller11.11%18.33%


Michael S. Tsirkin11.11%18.33%


Thomas Gleixner11.11%18.33%


Björn Helgaas11.11%18.33%


Total90100.00%12100.00%






void pci_disable_msix(struct pci_dev *dev)
{
	if (!pci_msi_enable || !dev || !dev->msix_enabled)
		return;

	pci_msix_shutdown(dev);
	free_msi_irqs(dev);
}

Contributors
PersonTokensPropCommitsCommitProp
Yinghai Lu2882.35%133.33%


Michael Ellerman514.71%133.33%


Hidetoshi Seto12.94%133.33%


Total34100.00%3100.00%




EXPORT_SYMBOL(pci_disable_msix);




void pci_no_msi(void)
{
	pci_msi_enable = 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Wilcox11100.00%1100.00%


Total11100.00%1100.00%



/**
 * pci_msi_enabled - is MSI enabled?
 *
 * Returns true if MSI has not been disabled by the command-line option
 * pci=nomsi.
 **/



int pci_msi_enabled(void)
{
	return pci_msi_enable;
}

Contributors
PersonTokensPropCommitsCommitProp
Andrew Patterson10100.00%1100.00%


Total10100.00%1100.00%




EXPORT_SYMBOL(pci_msi_enabled);




static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
				  const struct irq_affinity *affd)
{
	int nvec;
	int rc;

	if (!pci_msi_supported(dev, minvec))
		return -EINVAL;

	WARN_ON(!!dev->msi_enabled);

	/* Check whether driver already requested MSI-X irqs */
	if (dev->msix_enabled) {
		dev_info(&dev->dev,
			 "can't enable MSI (MSI-X already enabled)\n");
		return -EINVAL;
	}

	if (maxvec < minvec)
		return -ERANGE;

	nvec = pci_msi_vec_count(dev);
	if (nvec < 0)
		return nvec;
	if (nvec < minvec)
		return -ENOSPC;

	if (nvec > maxvec)
		nvec = maxvec;

	for (;;) {
		if (affd) {
			nvec = irq_calc_affinity_vectors(nvec, affd);
			if (nvec < minvec)
				return -ENOSPC;
		}

		rc = msi_capability_init(dev, nvec, affd);
		if (rc == 0)
			return nvec;

		if (rc < 0)
			return rc;
		if (rc < minvec)
			return -ENOSPC;

		nvec = rc;
	}
}


Contributors
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Alexander Gordeev14775.00%444.44%


Christoph Hellwig4321.94%333.33%


Thomas Gleixner52.55%111.11%


Dennis Chen10.51%111.11%


Total196100.00%9100.00%



/* deprecated, don't use */



int pci_enable_msi(struct pci_dev *dev)
{
	int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
	if (rc < 0)
		return rc;
	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig3494.44%375.00%


Alexander Gordeev25.56%125.00%


Total36100.00%4100.00%




EXPORT_SYMBOL(pci_enable_msi);




static int __pci_enable_msix_range(struct pci_dev *dev,
				   struct msix_entry *entries, int minvec,
				   int maxvec, const struct irq_affinity *affd)
{
	int rc, nvec = maxvec;

	if (maxvec < minvec)
		return -ERANGE;

	for (;;) {
		if (affd) {
			nvec = irq_calc_affinity_vectors(nvec, affd);
			if (nvec < minvec)
				return -ENOSPC;
		}

		rc = __pci_enable_msix(dev, entries, nvec, affd);
		if (rc == 0)
			return nvec;

		if (rc < 0)
			return rc;
		if (rc < minvec)
			return -ENOSPC;

		nvec = rc;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Alexander Gordeev6956.56%120.00%


Christoph Hellwig4335.25%360.00%


Thomas Gleixner108.20%120.00%


Total122100.00%5100.00%



/**
 * pci_enable_msix_range - configure device's MSI-X capability structure
 * @dev: pointer to the pci_dev data structure of MSI-X device function
 * @entries: pointer to an array of MSI-X entries
 * @minvec: minimum number of MSI-X irqs requested
 * @maxvec: maximum number of MSI-X irqs requested
 *
 * Setup the MSI-X capability structure of device function with a maximum
 * possible number of interrupts in the range between @minvec and @maxvec
 * upon its software driver call to request for MSI-X mode enabled on its
 * hardware device function. It returns a negative errno if an error occurs.
 * If it succeeds, it returns the actual number of interrupts allocated and
 * indicates the successful configuration of MSI-X capability structure
 * with new allocated MSI-X interrupts.
 **/



int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
		int minvec, int maxvec)
{
	return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL);
}

Contributors
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Christoph Hellwig3291.43%266.67%


Alexander Gordeev38.57%133.33%


Total35100.00%3100.00%




EXPORT_SYMBOL(pci_enable_msix_range);

/**
 * pci_alloc_irq_vectors_affinity - allocate multiple IRQs for a device
 * @dev:                PCI device to operate on
 * @min_vecs:           minimum number of vectors required (must be >= 1)
 * @max_vecs:           maximum (desired) number of vectors
 * @flags:              flags or quirks for the allocation
 * @affd:               optional description of the affinity requirements
 *
 * Allocate up to @max_vecs interrupt vectors for @dev, using MSI-X or MSI
 * vectors if available, and fall back to a single legacy vector
 * if neither is available.  Return the number of vectors allocated,
 * (which might be smaller than @max_vecs) if successful, or a negative
 * error code on error. If less than @min_vecs interrupt vectors are
 * available for @dev the function will fail with -ENOSPC.
 *
 * To get the Linux IRQ number used for a vector that can be passed to
 * request_irq() use the pci_irq_vector() helper.
 */



int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
				   unsigned int max_vecs, unsigned int flags,
				   const struct irq_affinity *affd)
{
	static const struct irq_affinity msi_default_affd;
	int vecs = -ENOSPC;

	if (flags & PCI_IRQ_AFFINITY) {
		if (!affd)
			affd = &msi_default_affd;

		if (affd->pre_vectors + affd->post_vectors > min_vecs)
			return -EINVAL;

		/*
                 * If there aren't any vectors left after applying the pre/post
                 * vectors don't bother with assigning affinity.
                 */
		if (affd->pre_vectors + affd->post_vectors == min_vecs)
			affd = NULL;
	} else {
		if (WARN_ON(affd))
			affd = NULL;
	}

	if (flags & PCI_IRQ_MSIX) {
		vecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
				affd);
		if (vecs > 0)
			return vecs;
	}

	if (flags & PCI_IRQ_MSI) {
		vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
		if (vecs > 0)
			return vecs;
	}

	/* use legacy irq if allowed */
	if (flags & PCI_IRQ_LEGACY) {
		if (min_vecs == 1 && dev->irq) {
			pci_intx(dev, 1);
			return 1;
		}
	}

	return vecs;
}

Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig201100.00%8100.00%


Total201100.00%8100.00%




EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity);

/**
 * pci_free_irq_vectors - free previously allocated IRQs for a device
 * @dev:                PCI device to operate on
 *
 * Undoes the allocations and enabling in pci_alloc_irq_vectors().
 */



void pci_free_irq_vectors(struct pci_dev *dev)
{
	pci_disable_msix(dev);
	pci_disable_msi(dev);
}

Contributors
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Christoph Hellwig20100.00%1100.00%


Total20100.00%1100.00%




EXPORT_SYMBOL(pci_free_irq_vectors);

/**
 * pci_irq_vector - return Linux IRQ number of a device vector
 * @dev: PCI device to operate on
 * @nr: device-relative interrupt vector index (0-based).
 */



int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
{
	if (dev->msix_enabled) {
		struct msi_desc *entry;
		int i = 0;

		for_each_pci_msi_entry(entry, dev) {
			if (i == nr)
				return entry->irq;
			i++;
		}
		WARN_ON_ONCE(1);
		return -EINVAL;
	}

	if (dev->msi_enabled) {
		struct msi_desc *entry = first_pci_msi_entry(dev);

		if (WARN_ON_ONCE(nr >= entry->nvec_used))
			return -EINVAL;
	} else {
		if (WARN_ON_ONCE(nr > 0))
			return -EINVAL;
	}

	return dev->irq + nr;
}

Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig119100.00%1100.00%


Total119100.00%1100.00%




EXPORT_SYMBOL(pci_irq_vector);

/**
 * pci_irq_get_affinity - return the affinity of a particular msi vector
 * @dev:        PCI device to operate on
 * @nr:         device-relative interrupt vector index (0-based).
 */



const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
{
	if (dev->msix_enabled) {
		struct msi_desc *entry;
		int i = 0;

		for_each_pci_msi_entry(entry, dev) {
			if (i == nr)
				return entry->affinity;
			i++;
		}
		WARN_ON_ONCE(1);
		return NULL;
	} else if (dev->msi_enabled) {
		struct msi_desc *entry = first_pci_msi_entry(dev);

		if (WARN_ON_ONCE(!entry || !entry->affinity ||
				 nr >= entry->nvec_used))
			return NULL;

		return &entry->affinity[nr];
	} else {
		return cpu_possible_mask;
	}
}

Contributors
PersonTokensPropCommitsCommitProp
Thomas Gleixner11595.83%150.00%


Jan Beulich54.17%150.00%


Total120100.00%2100.00%




EXPORT_SYMBOL(pci_irq_get_affinity);

/**
 * pci_irq_get_node - return the numa node of a particular msi vector
 * @pdev:       PCI device to operate on
 * @vec:        device-relative interrupt vector index (0-based).
 */



int pci_irq_get_node(struct pci_dev *pdev, int vec)
{
	const struct cpumask *mask;

	mask = pci_irq_get_affinity(pdev, vec);
	if (mask)
		return local_memory_node(cpu_to_node(cpumask_first(mask)));
	return dev_to_node(&pdev->dev);
}

Contributors
PersonTokensPropCommitsCommitProp
Shaohua Li53100.00%1100.00%


Total53100.00%1100.00%




EXPORT_SYMBOL(pci_irq_get_node);




struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
{
	return to_pci_dev(desc->dev);
}

Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu20100.00%1100.00%


Total20100.00%1100.00%




EXPORT_SYMBOL(msi_desc_to_pci_dev);




void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
	struct pci_dev *dev = msi_desc_to_pci_dev(desc);

	return dev->bus->sysdata;
}

Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu28100.00%1100.00%


Total28100.00%1100.00%




EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata);

#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
/**
 * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
 * @irq_data:   Pointer to interrupt data of the MSI interrupt
 * @msg:        Pointer to the message
 */



void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
{
	struct msi_desc *desc = irq_data_get_msi_desc(irq_data);

	/*
         * For MSI-X desc->irq is always equal to irq_data->irq. For
         * MSI only the first interrupt of MULTI MSI passes the test.
         */
	if (desc->irq == irq_data->irq)
		__pci_write_msi_msg(desc, msg);
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu43100.00%2100.00%


Total43100.00%2100.00%



/**
 * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
 * @dev:        Pointer to the PCI device
 * @desc:       Pointer to the msi descriptor
 *
 * The ID number is only used within the irqdomain.
 */



irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
					  struct msi_desc *desc)
{
	return (irq_hw_number_t)desc->msi_attrib.entry_nr |
		PCI_DEVID(dev->bus->number, dev->devfn) << 11 |
		(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu53100.00%1100.00%


Total53100.00%1100.00%






static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
{
	return !desc->msi_attrib.is_msix && desc->nvec_used > 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu26100.00%1100.00%


Total26100.00%1100.00%



/**
 * pci_msi_domain_check_cap - Verify that @domain supports the capabilities for @dev
 * @domain:     The interrupt domain to check
 * @info:       The domain info for verification
 * @dev:        The device to check
 *
 * Returns:
 *  0 if the functionality is supported
 *  1 if Multi MSI is requested, but the domain does not support it
 *  -ENOTSUPP otherwise
 */



int pci_msi_domain_check_cap(struct irq_domain *domain,
			     struct msi_domain_info *info, struct device *dev)
{
	struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));

	/* Special handling to support __pci_enable_msi_range() */
	if (pci_msi_desc_is_multi_msi(desc) &&
	    !(info->flags & MSI_FLAG_MULTI_PCI_MSI))
		return 1;
	else if (desc->msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
		return -ENOTSUPP;

	return 0;
}


Contributors
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Jiang Liu7798.72%150.00%


Christoph Hellwig11.28%150.00%


Total78100.00%2100.00%






static int pci_msi_domain_handle_error(struct irq_domain *domain,
				       struct msi_desc *desc, int error)
{
	/* Special handling to support __pci_enable_msi_range() */
	if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
		return 1;

	return error;
}


Contributors
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Jiang Liu3797.37%150.00%


Christoph Hellwig12.63%150.00%


Total38100.00%2100.00%



#ifdef GENERIC_MSI_DOMAIN_OPS



static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
				    struct msi_desc *desc)
{
	arg->desc = desc;
	arg->hwirq = pci_msi_domain_calc_hwirq(msi_desc_to_pci_dev(desc),
					       desc);
}

Contributors
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Jiang Liu35100.00%1100.00%


Total35100.00%1100.00%



#else

#define pci_msi_domain_set_desc		NULL
#endif


static struct msi_domain_ops pci_msi_domain_ops_default = {
	.set_desc	= pci_msi_domain_set_desc,
	.msi_check	= pci_msi_domain_check_cap,
	.handle_error	= pci_msi_domain_handle_error,
};




static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
{
	struct msi_domain_ops *ops = info->ops;

	if (ops == NULL) {
		info->ops = &pci_msi_domain_ops_default;
	} else {
		if (ops->set_desc == NULL)
			ops->set_desc = pci_msi_domain_set_desc;
		if (ops->msi_check == NULL)
			ops->msi_check = pci_msi_domain_check_cap;
		if (ops->handle_error == NULL)
			ops->handle_error = pci_msi_domain_handle_error;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu80100.00%1100.00%


Total80100.00%1100.00%






static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
{
	struct irq_chip *chip = info->chip;

	BUG_ON(!chip);
	if (!chip->irq_write_msi_msg)
		chip->irq_write_msi_msg = pci_msi_domain_write_msg;
	if (!chip->irq_mask)
		chip->irq_mask = pci_msi_mask_irq;
	if (!chip->irq_unmask)
		chip->irq_unmask = pci_msi_unmask_irq;
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu3960.00%150.00%


Marc Zyngier2640.00%150.00%


Total65100.00%2100.00%



/**
 * pci_msi_create_irq_domain - Create a MSI interrupt domain
 * @fwnode:     Optional fwnode of the interrupt controller
 * @info:       MSI domain info
 * @parent:     Parent irq domain
 *
 * Updates the domain and chip ops and creates a MSI interrupt domain.
 *
 * Returns:
 * A domain pointer or NULL in case of failure.
 */



struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
					     struct msi_domain_info *info,
					     struct irq_domain *parent)
{
	struct irq_domain *domain;

	if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
		pci_msi_domain_update_dom_ops(info);
	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
		pci_msi_domain_update_chip_ops(info);

	info->flags |= MSI_FLAG_ACTIVATE_EARLY;

	domain = msi_create_irq_domain(fwnode, info, parent);
	if (!domain)
		return NULL;

	domain->bus_token = DOMAIN_BUS_PCI_MSI;
	return domain;
}

Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu5462.07%125.00%


Marc Zyngier3337.93%375.00%


Total87100.00%4100.00%




EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);




static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
{
	u32 *pa = data;

	*pa = alias;
	return 0;
}

Contributors
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David Daney32100.00%1100.00%


Total32100.00%1100.00%



/**
 * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
 * @domain:     The interrupt domain
 * @pdev:       The PCI device.
 *
 * The RID for a device is formed from the alias, with a firmware
 * supplied mapping applied
 *
 * Returns: The RID.
 */



u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
{
	struct device_node *of_node;
	u32 rid = 0;

	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);

	of_node = irq_domain_get_of_node(domain);
	rid = of_node ? of_msi_map_rid(&pdev->dev, of_node, rid) :
			iort_msi_map_rid(&pdev->dev, rid);

	return rid;
}


Contributors
PersonTokensPropCommitsCommitProp
David Daney5983.10%150.00%


Tomasz Nowicki1216.90%150.00%


Total71100.00%2100.00%



/**
 * pci_msi_get_device_domain - Get the MSI domain for a given PCI device
 * @pdev:       The PCI device
 *
 * Use the firmware data to find a device-specific MSI domain
 * (i.e. not one that is ste as a default).
 *
 * Returns: The coresponding MSI domain or NULL if none has been found.
 */



struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
{
	struct irq_domain *dom;
	u32 rid = 0;

	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
	dom = of_msi_map_get_device_domain(&pdev->dev, rid);
	if (!dom)
		dom = iort_get_device_domain(&pdev->dev, rid);
	return dom;
}

Contributors
PersonTokensPropCommitsCommitProp
Marc Zyngier3757.81%150.00%


Tomasz Nowicki2742.19%150.00%


Total64100.00%2100.00%



#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */

Overall Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu78913.05%147.69%


Christoph Hellwig65910.90%168.79%


Hidetoshi Seto5308.76%116.04%


Matthew Wilcox4617.62%105.49%


Greg Kroah-Hartman3846.35%31.65%


Alexander Gordeev2904.80%73.85%


Thomas Gleixner2854.71%84.40%


Andrew Morton2383.94%21.10%


Eric W. Biedermann2243.70%126.59%


Neil Horman1873.09%10.55%


Michael Ellerman1823.01%126.59%


Yijing Wang1612.66%84.40%


Ben Hutchings1542.55%21.10%


Roland Dreier1502.48%31.65%


Marc Zyngier1081.79%63.30%


Yinghai Lu1011.67%31.65%


Benjamin Herrenschmidt1011.67%10.55%


David Daney951.57%10.55%


Björn Helgaas881.46%137.14%


Thierry Reding841.39%10.55%


Konrad Rzeszutek Wilk731.21%10.55%


Adrian Bunk681.12%10.55%


Thomas Petazzoni651.07%10.55%


Shaohua Li590.98%10.55%


Tomasz Nowicki420.69%10.55%


Brice Goglin370.61%31.65%


David S. Miller350.58%10.55%


Jan Beulich350.58%21.10%


Duan Zhenzhong350.58%10.55%


Rafael J. Wysocki330.55%10.55%


Lucas Stach330.55%10.55%


Romain Bezut280.46%10.55%


Gavin Shan270.45%31.65%


Mark Maule240.40%10.55%


Michael S. Tsirkin220.36%42.20%


Keith Busch210.35%10.55%


Jake Oshins200.33%10.55%


David Shaohua Li190.31%10.55%


Mitch A Williams170.28%10.55%


Dan Carpenter160.26%10.55%


Andrew Patterson160.26%10.55%


Alexei Starovoitov70.12%10.55%


Kristen Carlson Accardi60.10%10.55%


Sheng Yang60.10%10.55%


Linas Vepstas50.08%10.55%


Ashok Raj40.07%10.55%


Lorenzo Pieralisi40.07%10.55%


Tejun Heo30.05%10.55%


Paul Gortmaker30.05%10.55%


Grant Grundler30.05%10.55%


Kenji Kaneshige20.03%21.10%


Randy Dunlap10.02%10.55%


Prarit Bhargava10.02%10.55%


Christophe Jaillet10.02%10.55%


Masanari Iida10.02%10.55%


Dan J Williams10.02%10.55%


Jike Song10.02%10.55%


Dennis Chen10.02%10.55%


Ryan Desfosses10.02%10.55%


Total6047100.00%182100.00%


Directory: drivers/pci



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