Rafael J. Wysocki | 28eb5f2 | 2010-08-21 22:02:38 +0200 | [diff] [blame] | 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 | |
| 21 | /** |
| 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. |
| 25 | * |
| 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. |
| 30 | * |
| 31 | * NOTE: It turns out that we cannot do that for individual port services |
| 32 | * separately, because that would make some systems work incorrectly. |
| 33 | */ |
| 34 | int pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask) |
| 35 | { |
Rafael J. Wysocki | 415e12b | 2011-01-07 00:55:09 +0100 | [diff] [blame^] | 36 | struct acpi_pci_root *root; |
Rafael J. Wysocki | 28eb5f2 | 2010-08-21 22:02:38 +0200 | [diff] [blame] | 37 | acpi_handle handle; |
| 38 | u32 flags; |
| 39 | |
| 40 | if (acpi_pci_disabled) |
| 41 | return 0; |
| 42 | |
| 43 | handle = acpi_find_root_bridge_handle(port); |
| 44 | if (!handle) |
| 45 | return -EINVAL; |
| 46 | |
Rafael J. Wysocki | 415e12b | 2011-01-07 00:55:09 +0100 | [diff] [blame^] | 47 | root = acpi_pci_find_root(handle); |
| 48 | if (!root) |
Rafael J. Wysocki | 28eb5f2 | 2010-08-21 22:02:38 +0200 | [diff] [blame] | 49 | return -ENODEV; |
Rafael J. Wysocki | 28eb5f2 | 2010-08-21 22:02:38 +0200 | [diff] [blame] | 50 | |
Rafael J. Wysocki | 415e12b | 2011-01-07 00:55:09 +0100 | [diff] [blame^] | 51 | flags = root->osc_control_set; |
Rafael J. Wysocki | 28eb5f2 | 2010-08-21 22:02:38 +0200 | [diff] [blame] | 52 | |
| 53 | *srv_mask = PCIE_PORT_SERVICE_VC; |
| 54 | if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL) |
| 55 | *srv_mask |= PCIE_PORT_SERVICE_HP; |
| 56 | if (flags & OSC_PCI_EXPRESS_PME_CONTROL) |
| 57 | *srv_mask |= PCIE_PORT_SERVICE_PME; |
| 58 | if (flags & OSC_PCI_EXPRESS_AER_CONTROL) |
| 59 | *srv_mask |= PCIE_PORT_SERVICE_AER; |
| 60 | |
| 61 | return 0; |
| 62 | } |