From patchwork Sat Jul 24 23:05:23 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rafael Wysocki X-Patchwork-Id: 114079 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o6ON6aCi019376 for ; Sat, 24 Jul 2010 23:06:36 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753089Ab0GXXGf (ORCPT ); Sat, 24 Jul 2010 19:06:35 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:55869 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753024Ab0GXXGe (ORCPT ); Sat, 24 Jul 2010 19:06:34 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by ogre.sisk.pl (Postfix) with ESMTP id 77DC018DBAD; Sun, 25 Jul 2010 01:03:35 +0200 (CEST) Received: from ogre.sisk.pl ([127.0.0.1]) by localhost (ogre.sisk.pl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 29437-03; Sun, 25 Jul 2010 01:03:27 +0200 (CEST) Received: from ferrari.localnet (220-bem-13.acn.waw.pl [82.210.184.220]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ogre.sisk.pl (Postfix) with ESMTP id 1077318D2B6; Sun, 25 Jul 2010 01:03:27 +0200 (CEST) From: "Rafael J. Wysocki" To: linux-pci@vger.kernel.org Subject: [RFC][PATCH] PCI / PCIe: Ask BIOS for control of all native services simultaneously Date: Sun, 25 Jul 2010 01:05:23 +0200 User-Agent: KMail/1.13.5 (Linux/2.6.35-rc6-rjw+; KDE/4.4.4; x86_64; ; ) Cc: Len Brown , ACPI Devel Maling List , linux-pm@lists.linux-foundation.org, Linux Kernel Mailing List , Matthew Garrett , Jesse Barnes MIME-Version: 1.0 Message-Id: <201007250105.23610.rjw@sisk.pl> X-Virus-Scanned: amavisd-new at ogre.sisk.pl using MkS_Vir for Linux Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Sat, 24 Jul 2010 23:06:36 +0000 (UTC) Index: linux-2.6/drivers/pci/pcie/portdrv_pci.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/portdrv_pci.c +++ linux-2.6/drivers/pci/pcie/portdrv_pci.c @@ -29,6 +29,32 @@ MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); +/* + * If this switch is set, ACPI _OSC will be used to determine whether or not to + * enable PCIe port native services. + */ +static bool pcie_ports_auto = true; + +/* If this switch is set, PCIe port native services should not be enabled. */ +static bool pcie_ports_disabled; + +static int __init pcie_port_setup(char *str) +{ + if (!strncmp(str, "auto", 4)) { + pcie_ports_disabled = false; + pcie_ports_auto = true; + } else if (!strncmp(str, "native", 6)) { + pcie_ports_disabled = false; + pcie_ports_auto = false; + } else if (!strncmp(str, "compat", 6)) { + pcie_ports_disabled = true; + pcie_ports_auto = false; + } + + return 1; +} +__setup("pcie_ports=", pcie_port_setup); + /* global data */ static int pcie_portdrv_restore_config(struct pci_dev *dev) @@ -82,6 +108,11 @@ static int __devinit pcie_portdrv_probe( dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; " "check vendor BIOS\n", dev->vendor, dev->device); } + + status = pcie_port_platform_notify(dev); + if (status && pcie_ports_auto) + return status; + status = pcie_port_device_register(dev); if (status) return status; @@ -301,6 +332,9 @@ static int __init pcie_portdrv_init(void { int retval; + if (pcie_ports_disabled) + return -EACCES; + dmi_check_system(pcie_portdrv_dmi_table); retval = pcie_port_bus_register(); @@ -315,11 +349,4 @@ static int __init pcie_portdrv_init(void return retval; } -static void __exit pcie_portdrv_exit(void) -{ - pci_unregister_driver(&pcie_portdriver); - pcie_port_bus_unregister(); -} - module_init(pcie_portdrv_init); -module_exit(pcie_portdrv_exit); Index: linux-2.6/drivers/pci/pcie/portdrv_acpi.c =================================================================== --- /dev/null +++ linux-2.6/drivers/pci/pcie/portdrv_acpi.c @@ -0,0 +1,47 @@ +/* + * PCIe Port Native Services Support, ACPI-Related Part + * + * Copyright (C) 2010 Rafael J. Wysocki , Novell Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License V2. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include +#include + +/** + * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services. + * @port - PCIe Port service for a root port or event collector. + * + * Invoked when @port is identified as a PCIe port device. To avoid conflicts + * with the BIOS PCIe port native services support requires the BIOS to yield + * PCIe control of these services to the kernel. + * + * NOTE: It turns out that we cannot do that for individual port services + * separately, because that would make some systems work incorrectly. + */ +int pcie_port_acpi_setup(struct pci_dev *port) +{ + acpi_status status = AE_NOT_FOUND; + acpi_handle handle; + + if (acpi_pci_disabled) + return -ENOSYS; + + handle = acpi_find_root_bridge_handle(port); + if (!handle) + return -EINVAL; + + status = acpi_pci_osc_control_set(handle, + OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL | + OSC_PCI_EXPRESS_AER_CONTROL | + OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | + OSC_PCI_EXPRESS_PME_CONTROL); + + return ACPI_FAILURE(status) ? -ENODEV : 0; +} Index: linux-2.6/drivers/pci/pcie/portdrv.h =================================================================== --- linux-2.6.orig/drivers/pci/pcie/portdrv.h +++ linux-2.6/drivers/pci/pcie/portdrv.h @@ -30,6 +30,8 @@ extern void pcie_port_device_remove(stru extern int __must_check pcie_port_bus_register(void); extern void pcie_port_bus_unregister(void); +struct pci_dev; + #ifdef CONFIG_PCIE_PME extern bool pcie_pme_msi_disabled; @@ -42,9 +44,26 @@ static inline bool pcie_pme_no_msi(void) { return pcie_pme_msi_disabled; } + +extern void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable); #else /* !CONFIG_PCIE_PME */ static inline void pcie_pme_disable_msi(void) {} static inline bool pcie_pme_no_msi(void) { return false; } +static inline void pcie_pme_interrupt_enable(struct pci_dev *dev, bool en) {} #endif /* !CONFIG_PCIE_PME */ +#ifdef CONFIG_ACPI +extern int pcie_port_acpi_setup(struct pci_dev *port); + +static inline int pcie_port_platform_notify(struct pci_dev *port) +{ + return pcie_port_acpi_setup(port); +} +#else /* !CONFIG_ACPI */ +static inline int pcie_port_platform_notify(struct pci_dev *port) +{ + return 0; +} +#endif /* !CONFIG_ACPI */ + #endif /* _PORTDRV_H_ */ Index: linux-2.6/drivers/pci/pcie/Makefile =================================================================== --- linux-2.6.orig/drivers/pci/pcie/Makefile +++ linux-2.6/drivers/pci/pcie/Makefile @@ -6,10 +6,11 @@ obj-$(CONFIG_PCIEASPM) += aspm.o pcieportdrv-y := portdrv_core.o portdrv_pci.o portdrv_bus.o +pcieportdrv-$(CONFIG_ACPI) += portdrv_acpi.o obj-$(CONFIG_PCIEPORTBUS) += pcieportdrv.o # Build PCI Express AER if needed obj-$(CONFIG_PCIEAER) += aer/ -obj-$(CONFIG_PCIE_PME) += pme/ +obj-$(CONFIG_PCIE_PME) += pme/pcie_pme.o Index: linux-2.6/drivers/pci/pcie/portdrv_core.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/portdrv_core.c +++ linux-2.6/drivers/pci/pcie/portdrv_core.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "../pci.h" #include "portdrv.h" @@ -242,18 +243,31 @@ static int get_port_device_capability(st /* Hot-Plug Capable */ if (reg16 & PCI_EXP_FLAGS_SLOT) { pci_read_config_dword(dev, pos + PCI_EXP_SLTCAP, ®32); - if (reg32 & PCI_EXP_SLTCAP_HPC) + if (reg32 & PCI_EXP_SLTCAP_HPC) { services |= PCIE_PORT_SERVICE_HP; + /* + * Disable hot-plug interrupts in case the hot-plug + * service driver is not loaded. + */ + pos += PCI_EXP_SLTCTL; + pci_read_config_word(dev, pos, ®16); + reg16 &= ~(PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE); + pci_write_config_word(dev, pos, reg16); + } } /* AER capable */ - if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) + if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) { services |= PCIE_PORT_SERVICE_AER; + pci_disable_pcie_error_reporting(dev); + } /* VC support */ if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC)) services |= PCIE_PORT_SERVICE_VC; /* Root ports are capable of generating PME too */ - if (dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) + if (dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) { services |= PCIE_PORT_SERVICE_PME; + pcie_pme_interrupt_enable(dev, false); + } return services; } Index: linux-2.6/drivers/acpi/pci_root.c =================================================================== --- linux-2.6.orig/drivers/acpi/pci_root.c +++ linux-2.6/drivers/acpi/pci_root.c @@ -401,8 +401,9 @@ acpi_status acpi_pci_osc_control_set(acp goto out; } if ((root->osc_control_qry & control_req) != control_req) { - printk(KERN_DEBUG - "Firmware did not grant requested _OSC control\n"); + printk(KERN_INFO + "Firmware does not grant _OSC control for mask 0x%02x\n", + control_req); status = AE_SUPPORT; goto out; } Index: linux-2.6/drivers/pci/pcie/pme/pcie_pme.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/pme/pcie_pme.c +++ linux-2.6/drivers/pci/pcie/pme/pcie_pme.c @@ -24,37 +24,12 @@ #include #include "../../pci.h" -#include "pcie_pme.h" +#include "../portdrv.h" #define PCI_EXP_RTSTA_PME 0x10000 /* PME status */ #define PCI_EXP_RTSTA_PENDING 0x20000 /* PME pending */ /* - * If set, this switch will prevent the PCIe root port PME service driver from - * being registered. Consequently, the interrupt-based PCIe PME signaling will - * not be used by any PCIe root ports in that case. - */ -static bool pcie_pme_disabled = true; - -/* - * The PCI Express Base Specification 2.0, Section 6.1.8, states the following: - * "In order to maintain compatibility with non-PCI Express-aware system - * software, system power management logic must be configured by firmware to use - * the legacy mechanism of signaling PME by default. PCI Express-aware system - * software must notify the firmware prior to enabling native, interrupt-based - * PME signaling." However, if the platform doesn't provide us with a suitable - * notification mechanism or the notification fails, it is not clear whether or - * not we are supposed to use the interrupt-based PCIe PME signaling. The - * switch below can be used to indicate the desired behaviour. When set, it - * will make the kernel use the interrupt-based PCIe PME signaling regardless of - * the platform notification status, although the kernel will attempt to notify - * the platform anyway. When unset, it will prevent the kernel from using the - * the interrupt-based PCIe PME signaling if the platform notification fails, - * which is the default. - */ -static bool pcie_pme_force_enable; - -/* * If this switch is set, MSI will not be used for PCIe PME signaling. This * causes the PCIe port driver to use INTx interrupts only, but it turns out * that using MSI for PCIe PME signaling doesn't play well with PCIe PME-based @@ -64,38 +39,13 @@ bool pcie_pme_msi_disabled; static int __init pcie_pme_setup(char *str) { - if (!strncmp(str, "auto", 4)) - pcie_pme_disabled = false; - else if (!strncmp(str, "force", 5)) - pcie_pme_force_enable = true; - - str = strchr(str, ','); - if (str) { - str++; - str += strspn(str, " \t"); - if (*str && !strcmp(str, "nomsi")) - pcie_pme_msi_disabled = true; - } + if (!strncmp(str, "nomsi", 5)) + pcie_pme_msi_disabled = true; return 1; } __setup("pcie_pme=", pcie_pme_setup); -/** - * pcie_pme_platform_setup - Ensure that the kernel controls the PCIe PME. - * @srv: PCIe PME root port service to use for carrying out the check. - * - * Notify the platform that the native PCIe PME is going to be used and return - * 'true' if the control of the PCIe PME registers has been acquired from the - * platform. - */ -static bool pcie_pme_platform_setup(struct pcie_device *srv) -{ - if (!pcie_pme_platform_notify(srv)) - return true; - return pcie_pme_force_enable; -} - struct pcie_pme_service_data { spinlock_t lock; struct pcie_device *srv; @@ -108,7 +58,7 @@ struct pcie_pme_service_data { * @dev: PCIe root port or event collector. * @enable: Enable or disable the interrupt. */ -static void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable) +void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable) { int rtctl_pos; u16 rtctl; @@ -417,9 +367,6 @@ static int pcie_pme_probe(struct pcie_de struct pcie_pme_service_data *data; int ret; - if (!pcie_pme_platform_setup(srv)) - return -EACCES; - data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; @@ -509,8 +456,7 @@ static struct pcie_port_service_driver p */ static int __init pcie_pme_service_init(void) { - return pcie_pme_disabled ? - -ENODEV : pcie_port_service_register(&pcie_pme_driver); + return pcie_port_service_register(&pcie_pme_driver); } module_init(pcie_pme_service_init); Index: linux-2.6/drivers/pci/pcie/pme/pcie_pme.h =================================================================== --- linux-2.6.orig/drivers/pci/pcie/pme/pcie_pme.h +++ /dev/null @@ -1,28 +0,0 @@ -/* - * drivers/pci/pcie/pme/pcie_pme.h - * - * PCI Express Root Port PME signaling support - * - * Copyright (C) 2009 Rafael J. Wysocki , Novell Inc. - */ - -#ifndef _PCIE_PME_H_ -#define _PCIE_PME_H_ - -struct pcie_device; - -#ifdef CONFIG_ACPI -extern int pcie_pme_acpi_setup(struct pcie_device *srv); - -static inline int pcie_pme_platform_notify(struct pcie_device *srv) -{ - return pcie_pme_acpi_setup(srv); -} -#else /* !CONFIG_ACPI */ -static inline int pcie_pme_platform_notify(struct pcie_device *srv) -{ - return 0; -} -#endif /* !CONFIG_ACPI */ - -#endif Index: linux-2.6/drivers/pci/pcie/pme/pcie_pme_acpi.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/pme/pcie_pme_acpi.c +++ /dev/null @@ -1,54 +0,0 @@ -/* - * PCIe Native PME support, ACPI-related part - * - * Copyright (C) 2009 Rafael J. Wysocki , Novell Inc. - * - * This file is subject to the terms and conditions of the GNU General Public - * License V2. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include -#include -#include -#include -#include -#include - -/** - * pcie_pme_acpi_setup - Request the ACPI BIOS to release control over PCIe PME. - * @srv - PCIe PME service for a root port or event collector. - * - * Invoked when the PCIe bus type loads PCIe PME service driver. To avoid - * conflict with the BIOS PCIe support requires the BIOS to yield PCIe PME - * control to the kernel. - */ -int pcie_pme_acpi_setup(struct pcie_device *srv) -{ - acpi_status status = AE_NOT_FOUND; - struct pci_dev *port = srv->port; - acpi_handle handle; - int error = 0; - - if (acpi_pci_disabled) - return -ENOSYS; - - dev_info(&port->dev, "Requesting control of PCIe PME from ACPI BIOS\n"); - - handle = acpi_find_root_bridge_handle(port); - if (!handle) - return -EINVAL; - - status = acpi_pci_osc_control_set(handle, - OSC_PCI_EXPRESS_PME_CONTROL | - OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); - if (ACPI_FAILURE(status)) { - dev_info(&port->dev, - "Failed to receive control of PCIe PME service: %s\n", - (status == AE_SUPPORT || status == AE_NOT_FOUND) ? - "no _OSC support" : "ACPI _OSC failed"); - error = -ENODEV; - } - - return error; -} Index: linux-2.6/drivers/pci/pcie/pme/Makefile =================================================================== --- linux-2.6.orig/drivers/pci/pcie/pme/Makefile +++ /dev/null @@ -1,8 +0,0 @@ -# -# Makefile for PCI-Express Root Port PME signaling driver -# - -obj-$(CONFIG_PCIE_PME) += pmedriver.o - -pmedriver-objs := pcie_pme.o -pmedriver-$(CONFIG_ACPI) += pcie_pme_acpi.o Index: linux-2.6/drivers/pci/pcie/aer/aerdrv_acpi.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/aer/aerdrv_acpi.c +++ linux-2.6/drivers/pci/pcie/aer/aerdrv_acpi.c @@ -19,42 +19,6 @@ #include #include "aerdrv.h" -/** - * aer_osc_setup - run ACPI _OSC method - * @pciedev: pcie_device which AER is being enabled on - * - * @return: Zero on success. Nonzero otherwise. - * - * Invoked when PCIe bus loads AER service driver. To avoid conflict with - * BIOS AER support requires BIOS to yield AER control to OS native driver. - **/ -int aer_osc_setup(struct pcie_device *pciedev) -{ - acpi_status status = AE_NOT_FOUND; - struct pci_dev *pdev = pciedev->port; - acpi_handle handle = NULL; - - if (acpi_pci_disabled) - return -1; - - handle = acpi_find_root_bridge_handle(pdev); - if (handle) { - status = acpi_pci_osc_control_set(handle, - OSC_PCI_EXPRESS_AER_CONTROL | - OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); - } - - if (ACPI_FAILURE(status)) { - dev_printk(KERN_DEBUG, &pciedev->device, "AER service couldn't " - "init device: %s\n", - (status == AE_SUPPORT || status == AE_NOT_FOUND) ? - "no _OSC support" : "_OSC failed"); - return -1; - } - - return 0; -} - #ifdef CONFIG_ACPI_APEI static inline int hest_match_pci(struct acpi_hest_aer_common *p, struct pci_dev *pci) Index: linux-2.6/drivers/pci/pcie/aer/aerdrv_core.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/aer/aerdrv_core.c +++ linux-2.6/drivers/pci/pcie/aer/aerdrv_core.c @@ -777,9 +777,6 @@ int aer_init(struct pcie_device *dev) goto out; } - if (aer_osc_setup(dev)) - goto out; - return 0; out: if (forceload) { Index: linux-2.6/drivers/pci/hotplug/acpi_pcihp.c =================================================================== --- linux-2.6.orig/drivers/pci/hotplug/acpi_pcihp.c +++ linux-2.6/drivers/pci/hotplug/acpi_pcihp.c @@ -338,9 +338,7 @@ int acpi_get_hp_hw_control_from_firmware acpi_handle chandle, handle; struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; - flags &= (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | - OSC_SHPC_NATIVE_HP_CONTROL | - OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); + flags &= OSC_SHPC_NATIVE_HP_CONTROL; if (!flags) { err("Invalid flags %u specified!\n", flags); return -EINVAL; Index: linux-2.6/drivers/pci/hotplug/pciehp.h =================================================================== --- linux-2.6.orig/drivers/pci/hotplug/pciehp.h +++ linux-2.6/drivers/pci/hotplug/pciehp.h @@ -176,19 +176,7 @@ static inline void pciehp_firmware_init( { pciehp_acpi_slot_detection_init(); } - -static inline int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev) -{ - int retval; - u32 flags = (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | - OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); - retval = acpi_get_hp_hw_control_from_firmware(dev, flags); - if (retval) - return retval; - return pciehp_acpi_slot_detection_check(dev); -} #else #define pciehp_firmware_init() do {} while (0) -#define pciehp_get_hp_hw_control_from_firmware(dev) 0 #endif /* CONFIG_ACPI */ #endif /* _PCIEHP_H */ Index: linux-2.6/drivers/pci/hotplug/pciehp_core.c =================================================================== --- linux-2.6.orig/drivers/pci/hotplug/pciehp_core.c +++ linux-2.6/drivers/pci/hotplug/pciehp_core.c @@ -59,7 +59,7 @@ module_param(pciehp_force, bool, 0644); MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); -MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing"); +MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing"); #define PCIE_MODULE_NAME "pciehp" @@ -231,13 +231,6 @@ static int pciehp_probe(struct pcie_devi struct slot *slot; u8 occupied, poweron; - if (pciehp_force) - dev_info(&dev->device, - "Bypassing BIOS check for pciehp use on %s\n", - pci_name(dev->port)); - else if (pciehp_get_hp_hw_control_from_firmware(dev->port)) - goto err_out_none; - ctrl = pcie_init(dev); if (!ctrl) { dev_err(&dev->device, "Controller initialization failed\n");