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Commit f503ee4c authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/enumeration' into next 

* pci/enumeration:
  PCI: Include PCI-to-PCIe bridges as "Downstream Ports"
  PCI: Improve __pci_read_base() robustness
  PCI: Short-circuit pci_device_is_present() for disconnected devices
  PCI/MSI: Skip disabling disconnected devices
  PCI: Don't attempt config access to disconnected devices
  PCI: Add device disconnected state
  PCI: Export PCI device config accessors
parents d060c6fc 9b70ae49

drivers/pci/access.c

+58 −1
Original line number Diff line number Diff line
@@ -700,7 +700,8 @@ static bool pcie_downstream_port(const struct pci_dev *dev) 
	int type = pci_pcie_type(dev);



	return type == PCI_EXP_TYPE_ROOT_PORT ||

	       type == PCI_EXP_TYPE_DOWNSTREAM;

	       type == PCI_EXP_TYPE_DOWNSTREAM ||

	       type == PCI_EXP_TYPE_PCIE_BRIDGE;

}



bool pcie_cap_has_lnkctl(const struct pci_dev *dev)
@@ -890,3 +891,59 @@ int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos, 
	return ret;

}

EXPORT_SYMBOL(pcie_capability_clear_and_set_dword);



int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val)

{

	if (pci_dev_is_disconnected(dev)) {

		*val = ~0;

		return -ENODEV;

	}

	return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);

}

EXPORT_SYMBOL(pci_read_config_byte);



int pci_read_config_word(const struct pci_dev *dev, int where, u16 *val)

{

	if (pci_dev_is_disconnected(dev)) {

		*val = ~0;

		return -ENODEV;

	}

	return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);

}

EXPORT_SYMBOL(pci_read_config_word);



int pci_read_config_dword(const struct pci_dev *dev, int where,

					u32 *val)

{

	if (pci_dev_is_disconnected(dev)) {

		*val = ~0;

		return -ENODEV;

	}

	return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);

}

EXPORT_SYMBOL(pci_read_config_dword);



int pci_write_config_byte(const struct pci_dev *dev, int where, u8 val)

{

	if (pci_dev_is_disconnected(dev))

		return -ENODEV;

	return pci_bus_write_config_byte(dev->bus, dev->devfn, where, val);

}

EXPORT_SYMBOL(pci_write_config_byte);



int pci_write_config_word(const struct pci_dev *dev, int where, u16 val)

{

	if (pci_dev_is_disconnected(dev))

		return -ENODEV;

	return pci_bus_write_config_word(dev->bus, dev->devfn, where, val);

}

EXPORT_SYMBOL(pci_write_config_word);



int pci_write_config_dword(const struct pci_dev *dev, int where,

					 u32 val)

{

	if (pci_dev_is_disconnected(dev))

		return -ENODEV;

	return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);

}

EXPORT_SYMBOL(pci_write_config_dword);

drivers/pci/hotplug/pciehp_pci.c

+6 −0
Original line number Diff line number Diff line
@@ -109,6 +109,12 @@ int pciehp_unconfigure_device(struct slot *p_slot) 
				break;

			}

		}

		if (!presence) {

			pci_dev_set_disconnected(dev, NULL);

			if (pci_has_subordinate(dev))

				pci_walk_bus(dev->subordinate,

					     pci_dev_set_disconnected, NULL);

		}

		pci_stop_and_remove_bus_device(dev);

		/*

		 * Ensure that no new Requests will be generated from

drivers/pci/msi.c

+6 −1
Original line number Diff line number Diff line
@@ -298,7 +298,7 @@ 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) {

	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);
@@ -1001,6 +1001,11 @@ void pci_msix_shutdown(struct pci_dev *dev) 
	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 */

drivers/pci/pci.c

+2 −0
Original line number Diff line number Diff line
@@ -4934,6 +4934,8 @@ bool pci_device_is_present(struct pci_dev *pdev) 
{

	u32 v;



	if (pci_dev_is_disconnected(pdev))

		return false;

	return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0);

}

EXPORT_SYMBOL_GPL(pci_device_is_present);

drivers/pci/pci.h

+14 −0
Original line number Diff line number Diff line
@@ -274,6 +274,20 @@ struct pci_sriov { 
	resource_size_t barsz[PCI_SRIOV_NUM_BARS];	/* VF BAR size */

};



/* pci_dev priv_flags */

#define PCI_DEV_DISCONNECTED 0



static inline int pci_dev_set_disconnected(struct pci_dev *dev, void *unused)

{

	set_bit(PCI_DEV_DISCONNECTED, &dev->priv_flags);

	return 0;

}



static inline bool pci_dev_is_disconnected(const struct pci_dev *dev)

{

	return test_bit(PCI_DEV_DISCONNECTED, &dev->priv_flags);

}



#ifdef CONFIG_PCI_ATS

void pci_restore_ats_state(struct pci_dev *dev);

#else