2 * PCIe Port Native Services Support, ACPI-Related Part
4 * Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License V2. See the file "COPYING" in the main directory of this archive
11 #include <linux/pci.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/acpi.h>
15 #include <linux/pci-acpi.h>
16 #include <linux/pcieport_if.h>
18 #include "aer/aerdrv.h"
22 * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services.
23 * @port: PCIe Port service for a root port or event collector.
24 * @srv_mask: Bit mask of services that can be enabled for @port.
26 * Invoked when @port is identified as a PCIe port device. To avoid conflicts
27 * with the BIOS PCIe port native services support requires the BIOS to yield
28 * control of these services to the kernel. The mask of services that the BIOS
29 * allows to be enabled for @port is written to @srv_mask.
31 * NOTE: It turns out that we cannot do that for individual port services
32 * separately, because that would make some systems work incorrectly.
34 int pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
40 if (acpi_pci_disabled)
43 handle = acpi_find_root_bridge_handle(port);
47 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
48 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
49 | OSC_PCI_EXPRESS_PME_CONTROL;
51 if (pci_aer_available()) {
52 if (aer_acpi_firmware_first())
53 dev_dbg(&port->dev, "PCIe errors handled by BIOS.\n");
55 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
58 status = acpi_pci_osc_control_set(handle, &flags,
59 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
60 if (ACPI_FAILURE(status)) {
61 dev_dbg(&port->dev, "ACPI _OSC request failed (code %d)\n",
66 dev_info(&port->dev, "ACPI _OSC control granted for 0x%02x\n", flags);
68 *srv_mask = PCIE_PORT_SERVICE_VC;
69 if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
70 *srv_mask |= PCIE_PORT_SERVICE_HP;
71 if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
72 *srv_mask |= PCIE_PORT_SERVICE_PME;
73 if (flags & OSC_PCI_EXPRESS_AER_CONTROL)
74 *srv_mask |= PCIE_PORT_SERVICE_AER;