C++ PCI_DN函数代码示例

/** 
 * Return the "partitionable endpoint" (pe) under which this device lies
 */
struct device_node * find_device_pe(struct device_node *dn)
{
	while ((dn->parent) && PCI_DN(dn->parent) &&
	      (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) {
		dn = dn->parent;
	}
	return dn;
}

/**
 * eeh_enable_irq - enable interrupt for the recovering device
 */
static void eeh_enable_irq(struct pci_dev *dev)
{
	struct device_node *dn = pci_device_to_OF_node(dev);

	if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
		PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
		enable_irq(dev->irq);
	}
}

static void __eeh_clear_slot (struct device_node *dn, int mode_flag)
{
	while (dn) {
		if (PCI_DN(dn)) {
			PCI_DN(dn)->eeh_mode &= ~mode_flag;
			PCI_DN(dn)->eeh_check_count = 0;
			if (dn->child)
				__eeh_clear_slot (dn->child, mode_flag);
		}
		dn = dn->sibling;
	}
}

void eeh_clear_slot (struct device_node *dn, int mode_flag)
{
	unsigned long flags;
	spin_lock_irqsave(&confirm_error_lock, flags);
	
	dn = find_device_pe (dn);
	
	/* Back up one, since config addrs might be shared */
	if (PCI_DN(dn) && PCI_DN(dn)->eeh_pe_config_addr)
		dn = dn->parent;

	PCI_DN(dn)->eeh_mode &= ~mode_flag;
	PCI_DN(dn)->eeh_check_count = 0;
	__eeh_clear_slot (dn->child, mode_flag);
	spin_unlock_irqrestore(&confirm_error_lock, flags);
}

static void eeh_report_error(struct pci_dev *dev, void *userdata)
{
	enum pci_ers_result rc, *res = userdata;
	struct pci_driver *driver = dev->driver;

	dev->error_state = pci_channel_io_frozen;

	if (!driver)
		return;

	if (irq_in_use (dev->irq)) {
		struct device_node *dn = pci_device_to_OF_node(dev);
		PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED;
		disable_irq_nosync(dev->irq);
	}
	if (!driver->err_handler ||
	    !driver->err_handler->error_detected)
		return;

	rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen);

	/* A driver that needs a reset trumps all others */
	if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
	if (*res == PCI_ERS_RESULT_NONE) *res = rc;
}

static void iommu_bus_setup_pSeries(struct pci_bus *bus)
{
	struct device_node *dn;
	struct iommu_table *tbl;
	struct device_node *isa_dn, *isa_dn_orig;
	struct device_node *tmp;
	struct pci_dn *pci;
	int children;

	DBG("iommu_bus_setup_pSeries, bus %p, bus->self %p\n", bus, bus->self);

	dn = pci_bus_to_OF_node(bus);
	pci = PCI_DN(dn);

	if (bus->self) {
		/* This is not a root bus, any setup will be done for the
		 * device-side of the bridge in iommu_dev_setup_pSeries().
		 */
		return;
	}

	/* Check if the ISA bus on the system is under
	 * this PHB.
	 */
	isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa");

	while (isa_dn && isa_dn != dn)
		isa_dn = isa_dn->parent;

	if (isa_dn_orig)
		of_node_put(isa_dn_orig);

	/* Count number of direct PCI children of the PHB.
	 * All PCI device nodes have class-code property, so it's
	 * an easy way to find them.
	 */
	for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling)
		if (get_property(tmp, "class-code", NULL))
			children++;

	DBG("Children: %d\n", children);

	/* Calculate amount of DMA window per slot. Each window must be
	 * a power of two (due to pci_alloc_consistent requirements).
	 *
	 * Keep 256MB aside for PHBs with ISA.
	 */

	if (!isa_dn) {
		/* No ISA/IDE - just set window size and return */
		pci->phb->dma_window_size = 0x80000000ul; /* To be divided */

		while (pci->phb->dma_window_size * children > 0x80000000ul)
			pci->phb->dma_window_size >>= 1;
		DBG("No ISA/IDE, window size is 0x%lx\n",
			pci->phb->dma_window_size);
		pci->phb->dma_window_base_cur = 0;

		return;
	}

static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
{
	struct device_node *dn;
	int cnt, rc;

	/* pcibios will clear the counter; save the value */
	cnt = pe_dn->eeh_freeze_count;

	if (bus)
		pcibios_remove_pci_devices(bus);

	/* Reset the pci controller. (Asserts RST#; resets config space).
	 * Reconfigure bridges and devices. Don't try to bring the system
	 * up if the reset failed for some reason. */
	rc = rtas_set_slot_reset(pe_dn);
	if (rc)
		return rc;

	/* Walk over all functions on this device.  */
	dn = pe_dn->node;
	if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))
		dn = dn->parent->child;

	while (dn) {
		struct pci_dn *ppe = PCI_DN(dn);
		/* On Power4, always true because eeh_pe_config_addr=0 */
		if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) {
			rtas_configure_bridge(ppe);
			eeh_restore_bars(ppe);
 		}
		dn = dn->sibling;
	}

	/* Give the system 5 seconds to finish running the user-space
	 * hotplug shutdown scripts, e.g. ifdown for ethernet.  Yes, 
	 * this is a hack, but if we don't do this, and try to bring 
	 * the device up before the scripts have taken it down, 
	 * potentially weird things happen.
	 */
	if (bus) {
		ssleep (5);
		pcibios_add_pci_devices(bus);
	}
	pe_dn->eeh_freeze_count = cnt;

	return 0;
}

static int of_pci_phb_probe(struct platform_device *dev)
{
	struct pci_controller *phb;

	/* Check if we can do that ... */
	if (ppc_md.pci_setup_phb == NULL)
		return -ENODEV;

	pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);

	/* Alloc and setup PHB data structure */
	phb = pcibios_alloc_controller(dev->dev.of_node);
	if (!phb)
		return -ENODEV;

	/* Setup parent in sysfs */
	phb->parent = &dev->dev;

	/* Setup the PHB using arch provided callback */
	if (ppc_md.pci_setup_phb(phb)) {
		pcibios_free_controller(phb);
		return -ENODEV;
	}

	/* Process "ranges" property */
	pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);

	/* Init pci_dn data structures */
	pci_devs_phb_init_dynamic(phb);

	/* Create EEH devices for the PHB */
	eeh_dev_phb_init_dynamic(phb);

	/* Register devices with EEH */
	if (dev->dev.of_node->child)
		eeh_add_device_tree_early(PCI_DN(dev->dev.of_node));

	/* Scan the bus */
	pcibios_scan_phb(phb);
	if (phb->bus == NULL)
		return -ENXIO;

	/* Claim resources. This might need some rework as well depending
	 * whether we are doing probe-only or not, like assigning unassigned
	 * resources etc...
	 */
	pcibios_claim_one_bus(phb->bus);

	/* Finish EEH setup */
	eeh_add_device_tree_late(phb->bus);

	/* Add probed PCI devices to the device model */
	pci_bus_add_devices(phb->bus);

	/* sysfs files should only be added after devices are added */
	eeh_add_sysfs_files(phb->bus);

	return 0;
}

/*
 * Generate a Direct Select Address for the Hypervisor
 */
static inline u64 iseries_ds_addr(struct device_node *node)
{
	struct pci_dn *pdn = PCI_DN(node);
	const u32 *sbp = of_get_property(node, "linux,subbus", NULL);

	return ((u64)pdn->busno << 48) + ((u64)(sbp ? *sbp : 0) << 40)
			+ ((u64)0x10 << 32);
}

/**
 * pseries_eeh_write_config - Write PCI config space
 * @dn: device node
 * @where: PCI address
 * @size: size to write
 * @val: value to be written
 *
 * Write config space to the specified device
 */
static int pseries_eeh_write_config(struct device_node *dn, int where, int size, u32 val)
{
	struct pci_dn *pdn;

	pdn = PCI_DN(dn);

	return rtas_write_config(pdn, where, size, val);
}

void eeh_mark_slot (struct device_node *dn, int mode_flag)
{
	struct pci_dev *dev;
	dn = find_device_pe (dn);

	/* Back up one, since config addrs might be shared */
	if (PCI_DN(dn) && PCI_DN(dn)->eeh_pe_config_addr)
		dn = dn->parent;

	PCI_DN(dn)->eeh_mode |= mode_flag;

	/* Mark the pci device too */
	dev = PCI_DN(dn)->pcidev;
	if (dev)
		dev->error_state = pci_channel_io_frozen;

	__eeh_mark_slot (dn->child, mode_flag);
}

static void __eeh_mark_slot (struct device_node *dn, int mode_flag)
{
	while (dn) {
		if (PCI_DN(dn)) {
			/* Mark the pci device driver too */
			struct pci_dev *dev = PCI_DN(dn)->pcidev;

			PCI_DN(dn)->eeh_mode |= mode_flag;

			if (dev && dev->driver)
				dev->error_state = pci_channel_io_frozen;

			if (dn->child)
				__eeh_mark_slot (dn->child, mode_flag);
		}
		dn = dn->sibling;
	}
}

static void eeh_report_reset(struct pci_dev *dev, void *userdata)
{
	struct pci_driver *driver = dev->driver;
	struct device_node *dn = pci_device_to_OF_node(dev);

	if (!driver)
		return;

	if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
		PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
		enable_irq(dev->irq);
	}
	if (!driver->err_handler)
		return;
	if (!driver->err_handler->slot_reset)
		return;

	driver->err_handler->slot_reset(dev);
}

static void eeh_report_resume(struct pci_dev *dev, void *userdata)
{
	struct pci_driver *driver = dev->driver;
	struct device_node *dn = pci_device_to_OF_node(dev);

	dev->error_state = pci_channel_io_normal;

	if (!driver)
		return;

	if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
		PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
		enable_irq(dev->irq);
	}
	if (!driver->err_handler ||
	    !driver->err_handler->resume)
		return;

	driver->err_handler->resume(dev);
}

static inline struct iommu_table *devnode_table(struct device *dev)
{
	struct pci_dev *pdev;

	if (!dev) {
		pdev = ppc64_isabridge_dev;
		if (!pdev)
			return NULL;
	} else
		pdev = to_pci_dev(dev);

	return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
}