Commit 90e9cd50 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Jesse Barnes
Browse files

PCI: PCIe portdrv: Aviod using service devices with wrong interrupts 



The PCI Express port driver should not attempt to register service
devices that require the ability to generate interrupts if generating
interrupts is not possible.  Namely, if the port has no interrupt pin
configured and we cannot set up MSI or MSI-X for it, there is no way
it can generate interrupts and in such a case the port services that
rely on interrupts (PME, PCIe HP, AER) should not be enabled for it.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 1bf83e55

drivers/pci/pcie/portdrv_core.c

+28 −13
Original line number Diff line number Diff line
@@ -43,7 +43,7 @@ static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask) 
{

	struct pcie_port_data *port_data = pci_get_drvdata(dev);

	int i, pos, nvec, status = -EINVAL;

	int interrupt_mode = PCIE_PORT_INTx_MODE;

	int interrupt_mode = PCIE_PORT_NO_IRQ;



	/* Set INTx as default */

	for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
@@ -51,6 +51,8 @@ static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask) 
			nvec++;

		vectors[i] = dev->irq;

	}

	if (dev->pin)

		interrupt_mode = PCIE_PORT_INTx_MODE;



	/* Check MSI quirk */

	if (port_data->port_type == PCIE_RC_PORT && pcie_mch_quirk)
@@ -141,7 +143,7 @@ static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev, 
	dev->id.vendor = parent->vendor;

	dev->id.device = parent->device;

	dev->id.port_type = port_type;

	dev->id.service_type = (1 << service_type);

	dev->id.service_type = service_type;



	/* Initialize generic device interface */

	device = &dev->device;
@@ -232,19 +234,32 @@ int pcie_port_device_register(struct pci_dev *dev) 
	/* Allocate child services if any */

	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {

		struct pcie_device *child;

		int service = 1 << i;



		if (!(capabilities & service))

			continue;



		/*

		 * Don't use service devices that require interrupts if there is

		 * no way to generate them.

		 */

		if (irq_mode == PCIE_PORT_NO_IRQ

		    && service != PCIE_PORT_SERVICE_VC)

			continue;



		child = alloc_pcie_device(dev, service, vectors[i]);

		if (!child)

			continue;



		if (capabilities & (1 << i)) {

			child = alloc_pcie_device(dev, i, vectors[i]);

			if (child) {

		status = device_register(&child->device);

		if (status) {

			kfree(child);

			continue;

		}



		get_device(&child->device);

	}

		}

	}



	return 0;

}

include/linux/pcieport_if.h

+1 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#define PCIE_PORT_SERVICE_VC		8	/* Virtual Channel */



/* Root/Upstream/Downstream Port's Interrupt Mode */

#define PCIE_PORT_NO_IRQ		(-1)

#define PCIE_PORT_INTx_MODE		0

#define PCIE_PORT_MSI_MODE		1

#define PCIE_PORT_MSIX_MODE		2

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