1 /* 2 * PCIe Port Native Services Support, ACPI-Related Part 3 * 4 * Copyright (C) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. 5 * 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 8 * for more details. 9 */ 10 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> 17 18 #include "aer/aerdrv.h" 19 #include "../pci.h" 20 #include "portdrv.h" 21 22 /** 23 * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services. 24 * @port: PCIe Port service for a root port or event collector. 25 * @srv_mask: Bit mask of services that can be enabled for @port. 26 * 27 * Invoked when @port is identified as a PCIe port device. To avoid conflicts 28 * with the BIOS PCIe port native services support requires the BIOS to yield 29 * control of these services to the kernel. The mask of services that the BIOS 30 * allows to be enabled for @port is written to @srv_mask. 31 * 32 * NOTE: It turns out that we cannot do that for individual port services 33 * separately, because that would make some systems work incorrectly. 34 */ pcie_port_acpi_setup(struct pci_dev * port,int * srv_mask)35void pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask) 36 { 37 struct acpi_pci_root *root; 38 acpi_handle handle; 39 u32 flags; 40 41 if (acpi_pci_disabled) 42 return; 43 44 handle = acpi_find_root_bridge_handle(port); 45 if (!handle) 46 return; 47 48 root = acpi_pci_find_root(handle); 49 if (!root) 50 return; 51 52 flags = root->osc_control_set; 53 54 *srv_mask = PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_DPC; 55 if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL) 56 *srv_mask |= PCIE_PORT_SERVICE_HP; 57 if (flags & OSC_PCI_EXPRESS_PME_CONTROL) 58 *srv_mask |= PCIE_PORT_SERVICE_PME; 59 if (flags & OSC_PCI_EXPRESS_AER_CONTROL) 60 *srv_mask |= PCIE_PORT_SERVICE_AER; 61 } 62