2008-12-17 11:07:38 +08:00
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/*
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* ACPI related functions for PCI Express Hot Plug driver.
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*
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* Copyright (C) 2008 Kenji Kaneshige
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* Copyright (C) 2008 Fujitsu Limited.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/acpi.h>
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2008-12-17 11:09:12 +08:00
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/slab.h>
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2011-05-27 21:42:30 +08:00
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#include <linux/module.h>
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2008-12-17 11:07:38 +08:00
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#include "pciehp.h"
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#define PCIEHP_DETECT_PCIE (0)
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#define PCIEHP_DETECT_ACPI (1)
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2008-12-17 11:08:15 +08:00
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#define PCIEHP_DETECT_AUTO (2)
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#define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO
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2008-12-17 11:07:38 +08:00
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2009-09-15 16:24:46 +08:00
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struct dummy_slot {
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u32 number;
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struct list_head list;
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};
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2008-12-17 11:07:38 +08:00
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static int slot_detection_mode;
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static char *pciehp_detect_mode;
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module_param(pciehp_detect_mode, charp, 0444);
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MODULE_PARM_DESC(pciehp_detect_mode,
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2008-12-17 11:08:15 +08:00
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"Slot detection mode: pcie, acpi, auto\n"
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" pcie - Use PCIe based slot detection\n"
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" acpi - Use ACPI for slot detection\n"
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" auto(default) - Auto select mode. Use acpi option if duplicate\n"
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" slot ids are found. Otherwise, use pcie option\n");
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2008-12-17 11:07:38 +08:00
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int pciehp_acpi_slot_detection_check(struct pci_dev *dev)
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{
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if (slot_detection_mode != PCIEHP_DETECT_ACPI)
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return 0;
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2009-09-11 02:34:09 +08:00
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if (acpi_pci_detect_ejectable(DEVICE_ACPI_HANDLE(&dev->dev)))
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2008-12-17 11:07:38 +08:00
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return 0;
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return -ENODEV;
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}
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static int __init parse_detect_mode(void)
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{
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if (!pciehp_detect_mode)
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return PCIEHP_DETECT_DEFAULT;
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if (!strcmp(pciehp_detect_mode, "pcie"))
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return PCIEHP_DETECT_PCIE;
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if (!strcmp(pciehp_detect_mode, "acpi"))
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return PCIEHP_DETECT_ACPI;
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2008-12-17 11:08:15 +08:00
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if (!strcmp(pciehp_detect_mode, "auto"))
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return PCIEHP_DETECT_AUTO;
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2008-12-17 11:07:38 +08:00
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warn("bad specifier '%s' for pciehp_detect_mode. Use default\n",
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pciehp_detect_mode);
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return PCIEHP_DETECT_DEFAULT;
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}
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2008-12-17 11:08:15 +08:00
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static int __initdata dup_slot_id;
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static int __initdata acpi_slot_detected;
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static struct list_head __initdata dummy_slots = LIST_HEAD_INIT(dummy_slots);
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/* Dummy driver for dumplicate name detection */
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2009-01-13 21:44:19 +08:00
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static int __init dummy_probe(struct pcie_device *dev)
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2008-12-17 11:08:15 +08:00
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{
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int pos;
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u32 slot_cap;
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2009-09-11 02:34:09 +08:00
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acpi_handle handle;
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2009-09-15 16:24:46 +08:00
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struct dummy_slot *slot, *tmp;
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2008-12-17 11:08:15 +08:00
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struct pci_dev *pdev = dev->port;
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PCI: PCIe: Ask BIOS for control of all native services at once
After commit 852972acff8f10f3a15679be2059bb94916cba5d (ACPI: Disable
ASPM if the platform won't provide _OSC control for PCIe) control of
the PCIe Capability Structure is unconditionally requested by
acpi_pci_root_add(), which in principle may cause problems to
happen in two ways. First, the BIOS may refuse to give control of
the PCIe Capability Structure if it is not asked for any of the
_OSC features depending on it at the same time. Second, the BIOS may
assume that control of the _OSC features depending on the PCIe
Capability Structure will be requested in the future and may behave
incorrectly if that doesn't happen. For this reason, control of
the PCIe Capability Structure should always be requested along with
control of any other _OSC features that may depend on it (ie. PCIe
native PME, PCIe native hot-plug, PCIe AER).
Rework the PCIe port driver so that (1) it checks which native PCIe
port services can be enabled, according to the BIOS, and (2) it
requests control of all these services simultaneously. In
particular, this causes pcie_portdrv_probe() to fail if the BIOS
refuses to grant control of the PCIe Capability Structure, which
means that no native PCIe port services can be enabled for the PCIe
Root Complex the given port belongs to. If that happens, ASPM is
disabled to avoid problems with mishandling it by the part of the
PCIe hierarchy for which control of the PCIe Capability Structure
has not been received.
Make it possible to override this behavior using 'pcie_ports=native'
(use the PCIe native services regardless of the BIOS response to the
control request), or 'pcie_ports=compat' (do not use the PCIe native
services at all).
Accordingly, rework the existing PCIe port service drivers so that
they don't request control of the services directly.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2010-08-22 04:02:38 +08:00
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2009-11-11 13:34:52 +08:00
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pos = pci_pcie_cap(pdev);
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if (!pos)
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2008-12-17 11:08:15 +08:00
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return -ENODEV;
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pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &slot_cap);
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2009-02-09 05:45:24 +08:00
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slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot)
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return -ENOMEM;
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2008-12-17 11:08:15 +08:00
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slot->number = slot_cap >> 19;
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2009-09-15 16:24:46 +08:00
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list_for_each_entry(tmp, &dummy_slots, list) {
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2008-12-17 11:08:15 +08:00
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if (tmp->number == slot->number)
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dup_slot_id++;
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}
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2009-09-15 16:24:46 +08:00
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list_add_tail(&slot->list, &dummy_slots);
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2009-09-11 02:34:09 +08:00
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handle = DEVICE_ACPI_HANDLE(&pdev->dev);
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if (!acpi_slot_detected && acpi_pci_detect_ejectable(handle))
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2008-12-17 11:08:15 +08:00
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acpi_slot_detected = 1;
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return -ENODEV; /* dummy driver always returns error */
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}
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static struct pcie_port_service_driver __initdata dummy_driver = {
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.name = "pciehp_dummy",
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2009-01-13 21:46:46 +08:00
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.port_type = PCIE_ANY_PORT,
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.service = PCIE_PORT_SERVICE_HP,
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2008-12-17 11:08:15 +08:00
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.probe = dummy_probe,
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};
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static int __init select_detection_mode(void)
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{
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2009-09-15 16:24:46 +08:00
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struct dummy_slot *slot, *tmp;
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2010-12-18 20:29:45 +08:00
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if (pcie_port_service_register(&dummy_driver))
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return PCIEHP_DETECT_ACPI;
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2008-12-17 11:08:15 +08:00
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pcie_port_service_unregister(&dummy_driver);
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2009-09-15 16:24:46 +08:00
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list_for_each_entry_safe(slot, tmp, &dummy_slots, list) {
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list_del(&slot->list);
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2008-12-17 11:08:15 +08:00
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kfree(slot);
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}
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if (acpi_slot_detected && dup_slot_id)
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return PCIEHP_DETECT_ACPI;
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return PCIEHP_DETECT_PCIE;
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}
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2008-12-17 11:07:38 +08:00
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void __init pciehp_acpi_slot_detection_init(void)
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{
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slot_detection_mode = parse_detect_mode();
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2008-12-17 11:08:15 +08:00
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if (slot_detection_mode != PCIEHP_DETECT_AUTO)
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goto out;
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slot_detection_mode = select_detection_mode();
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out:
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if (slot_detection_mode == PCIEHP_DETECT_ACPI)
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info("Using ACPI for slot detection.\n");
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2008-12-17 11:07:38 +08:00
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}
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