- 20 4月, 2008 1 次提交
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由 Mike Travis 提交于
* Use new set_cpus_allowed_ptr() function added by previous patch, which instead of passing the "newly allowed cpus" cpumask_t arg by value, pass it by pointer: -int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) +int set_cpus_allowed_ptr(struct task_struct *p, const cpumask_t *new_mask) * Modify CPU_MASK_ALL Depends on: [sched-devel]: sched: add new set_cpus_allowed_ptr function Signed-off-by: NMike Travis <travis@sgi.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 29 3月, 2008 1 次提交
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由 Jean Delvare 提交于
This reverts commit 3c0a654e and fixes kernel bug #10245: http://bugzilla.kernel.org/show_bug.cgi?id=10245 The HP Compaq nc6120 has the same PCI sub-device ID as the nx6110, and the SMBus is used by ACPI for thermal management on the nc6120, so Linux should not attach a native driver to it. This means that this quirk is unsafe and has to be removed. I also added a comment to help developers realize that adding new IDs to this SMBus unhiding quirk table should be done only with great care, and in particular only after checking that ACPI is not making use of the SMBus. Signed-off-by: NJean Delvare <khali@linux-fr.org> Cc: Tomasz Koprowski <tomek@koprowski.org> Acked-by: NGreg Kroah-Hartman <gregkh@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 27 3月, 2008 1 次提交
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由 Linus Torvalds 提交于
This reverts commit 8fa5913d, which caused various interesting problems for people, including wrong resource allocations. See for example bugzilla entry "2.6.25-rc2: ohci1394 problem (MMIO broken)" at http://bugzilla.kernel.org/show_bug.cgi?id=10080 And Gary Hade says: "The same change had also exposed an issue reported by Paul Martin that has been causing an Oops while hotplugging ThinkPads to a ThinkPad Dock II. See http://lkml.org/lkml/2008/2/19/405 http://bugzilla.kernel.org/show_bug.cgi?id=9961 I have a fix for the ThinkPad docking Oops but if the issue being discussed here is caused by the transparent bridge sizing removal change I totally agree that it should be reverted." The transparent bridge sizing removal change was motivated by insufficient PCI memory resource for a transparent bridge window that was being created as a result of expansion ROM(s) being included in the transparent bridge sizing calculations. A later "PCI: Remove default PCI expansion ROM memory allocation" change ( re: http://lkml.org/lkml/2007/12/11/361 ) removes the expansion ROM(s) from the transparent bridge sizing calculations which actually resolves the original issue in a different manner. So, even if the "PCI: remove transparent bridge sizing" is not problematic it is no longer needed anyway." Identified-by: NIvan Kokshaysky <ink@jurassic.park.msu.ru> Tested-by: NThomas Meyer <thomas@m3y3r.de> Acked-by: NGary Hade <garyhade@us.ibm.com> Acked-by: NIngo Molnar <mingo@elte.hu> Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 25 3月, 2008 2 次提交
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由 Andrew Morton 提交于
Revert as it is reported to cause problems for people. commit 4348a2dc Author: Shaohua Li <shaohua.li@intel.com> Date: Wed Oct 24 10:45:08 2007 +0800 pcie: utilize pcie transaction pending bit PCIE has a mechanism to wait for Non-Posted request to complete. I think pci_disable_device is a good place to do this. Signed-off-by: NShaohua Li <shaohua.li@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de> Due to the regression reported at http://bugzilla.kernel.org/show_bug.cgi?id=10065 Cc: Shaohua Li <shaohua.li@intel.com> Cc: Soeren Sonnenburg <kernel@nn7.de> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Mark Gross 提交于
lockdep goes off on the iova copy_reserved_iova() because it and a function it calls grabs locks in the from, and the to of the copy operation. The function grab locks of the same lock classes triggering the warning. The first lock grabbed is for the constant reserved areas that is never accessed after early boot. Technically you could do without grabbing the locks for the "from" structure its copying reserved areas from. But dropping the from locks to me looks wrong, even though it would be ok. The affected code only runs in early boot as its setting up the DMAR engines. This patch gives the reserved_ioval_list locks special lockdep classes. Signed-off-by: NMark Gross <mgross@linux.intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 18 3月, 2008 1 次提交
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由 Mark Lord 提交于
This fixes a 2.6.25 regression reported by Alex Chiang. Invoke pciehp_enable_slot() at startup only when pciehp_force=1. Some HP equipment apparently cannot cope with it otherwise. This restores the (previously working) 2.6.24 behaviour here, while allowing machines that need a kick to use pciehp_force=1. This was the original design back in October 2007, but Kristen suggested we try without it first: Kristen Carlson Accardi wrote: >I think it would be ok to try allowing the slot to be enabled when not >using pciehp_force mode. We can wrap it later if it proves to break things This ended up breaking one of Alex's setups, so it's time to put the wrapper back in now. Signed-off-by: NMark Lord <mlord@pobox.com> Acked-by: NAlex Chiang <achiang@hp.com> Acked-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 3月, 2008 1 次提交
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由 Greg Kroah-Hartman 提交于
PCI busses can be registered multiple times, so we need to detect if we have registered our bus structure in sysfs already. If so, don't do it again. Thanks to Guennadi Liakhovetski <g.liakhovetski@gmx.de> for reporting the problem, and to Linus for poking me to get me to believe that it was a real problem. Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 11 3月, 2008 1 次提交
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由 Jesper Juhl 提交于
In drivers/pci/hotplug/ibmphp_ebda.c::ebda_rsrc_controller(), storage is allocated with kzalloc() and assigned to 'tmp_slot'. Then lots of stuff, like ->flag, ->supported_speed etc is set in tmp_slot. A bit further down there's then this test : if (!bus_info_ptr1) { rc = -ENODEV; goto error; } At this point, tmp_slot has not been assigned to anything, so when erroring-out we want to free it, but nothing at the 'error:' label free's 'tmp_slot' - and we can't really free 'tmp_slot' at 'error:' since we may jump to that label later when 'tmp_slot' *has* been used and we do not want it freed. So, the only sane option left seems to be to kfree(tmp_slot) just before jumping to the 'error:' label in the one place where this is what actually makes sense. The following patch does just that and thus kills off a tiny potential memory leak. Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 05 3月, 2008 5 次提交
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由 Kenji Kaneshige 提交于
Fix the error code path in hpc_power_off_slot(). The Bad DLLP Mask bit must be restored before return. Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Greg Kroah-Hartman 提交于
Due to the class_device cleanup of pci_bus, the error messages when things go wrong are incorrect. So fix this up to properly report what is really happening, if things go wrong. Thanks to Kay for pointing out the issue. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Sam Ravnborg 提交于
Fix following warning: WARNING: vmlinux.o(.text+0x47bdb1): Section mismatch in reference from the function pci_scan_child_bus() to the function .devinit.text:pcibios_fixup_bus() We had plenty of functions that could be annotated __devinit but due to the former restriction that exported symbols could not be annotated they were not so. So annotate these function and fix the references from the pci/hotplug/* code to silence the resuting warnings. Signed-off-by: NSam Ravnborg <sam@ravnborg.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Bjorn Helgaas 提交于
Two recent patches added basically the same code to turn on HT MSI mapping: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6bae1d96c6d7dde078994f6cb98235fd46f8736b http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=9dc625e72309e1c919ea3e7f51d0ffca96123787 There's no need to have both, so this patch removes one copy. Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Bjorn Helgaas 提交于
Convert quirk printks to dev_printk(). Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 04 3月, 2008 1 次提交
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由 Randy Dunlap 提交于
Fix docbook problems in kernel-api.tmpl. These cause the generated docbook to be incorrect. Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 24 2月, 2008 2 次提交
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由 mark gross 提交于
The following is a clean up and correction of the copyright holding entities for the files associated with the intel iommu code. Signed-off-by: <mgross@linux.intel.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Rafael J. Wysocki 提交于
During the last step of hibernation in the "platform" mode (with the help of ACPI) we use the suspend code, including the devices' ->suspend() methods, to prepare the system for entering the ACPI S4 system sleep state. But at least for some devices the operations performed by the ->suspend() callback in that case must be different from its operations during regular suspend. For this reason, introduce the new PM event type PM_EVENT_HIBERNATE and pass it to the device drivers' ->suspend() methods during the last phase of hibernation, so that they can distinguish this case and handle it as appropriate. Modify the drivers that handle PM_EVENT_SUSPEND in a special way and need to handle PM_EVENT_HIBERNATE in the same way. These changes are necessary to fix a hibernation regression related to the i915 driver (ref. http://lkml.org/lkml/2008/2/22/488). Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl> Acked-by: NPavel Machek <pavel@ucw.cz> Tested-by: NJeff Chua <jeff.chua.linux@gmail.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 23 2月, 2008 1 次提交
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由 David Brownell 提交于
Minor cleanups to acpi_pci_set_power_state(): use the ACPI and PCI state symbols to make clear that a mapping is being done between PCI and ACPI states, instead of using magic numbers. For paranoia's sake, report any errors. Save five bytes (x86_64) too. Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Signed-off-by: NLen Brown <len.brown@intel.com>
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- 22 2月, 2008 7 次提交
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由 Kenji Kaneshige 提交于
Fix wrong counter check for proc_dir_entry in pci_proc_detach_device(). The pci_proc_detach_device() returns with -EBUSY before calling remove_proc_entry() if the reference counter of proc_dir_entry is not 0. But this check is wrong and pci_proc_detach_device() always fails because the reference counter of proc_dir_entry is initialized with 1 at creating time and decremented in remove_proc_entry(). This bug cause strange behaviour as followings: - Accessing /proc/bus/pci/XXXX/YY file after hot-removing pci adapter card causes kernel panic. - Repeating hot-add/hot-remove of pci adapter card increases files with the same name under /proc/bus/pci/XXXX/ directory. For example: # pwd /proc/bus/pci/0002:09 # ls 01.0 # for i in `seq 5` > do > echo 0 > /sys/bus/pci/slots/0009_0032/power > echo 1 > /sys/bus/pci/slots/0009_0032/power > done # ls 01.0 01.0 01.0 01.0 01.0 01.0 The pci_proc_detach_device() should check if the reference counter is not larger than 1 instead. Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Andrew Morton 提交于
Use upper_32_bits(): no code changes, one less ifdef. Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Yinghai Lu 提交于
When acpi=off and pci=nomsi, don't load acpiphp. Fixes this: pci_hotplug: PCI Hot Plug PCI Core version: 0.5 acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 ACPI Exception (utmutex-0263): AE_BAD_PARAMETER, Thread FFFF81103CC54000 could not acquire Mutex [1] [20070126] [akpm@linux-foundation.org: export acpi_pci_disabled for acpiphp.ko] [akpm@linux-foundation.org: fix return statement] Signed-off-by: NYinghai Lu <yinghai.lu@sun.com> Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Peer Chen 提交于
According to HT spec, to get message interrupt from devices mapped to HT interrupt message, the 'En' bit of MSI Mapping capability need to be set. The patch do this setting in quirks code for the devices on HT-based nvidia platform. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: NAndy Currid <acurrid@nvidia.com> Signed-off-by: NPeer Chen <pchen@nvidia.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Randy Dunlap 提交于
Fix PCI kernel-doc warning: Warning(linux-2.6.24-git12//drivers/pci/pci-acpi.c:166): No description found for parameter 'hid' Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Crane Cai 提交于
PCI: modify SATA IDE mode quirk When initialize and resume, SB600/700/800 need to set SATA mode correctly. Signed-off-by: NCrane Cai <crane.cai@amd.com> Acked-by: NJeff Garzik <jeff@garzik.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Gary Hade 提交于
drivers/pci/hotplug/acpiphp_ibm.c:ibm_find_acpi_device() is not large enough to accommodate data returned by the _CID method executed from acpi_get_object_info(). This patch eliminates the problem by letting ACPI code (instead of driver code) determine and obtain a correctly sized buffer. Signed-off-by: NGary Hade <garyhade@us.ibm.com> Signed-off-by: NKristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 21 2月, 2008 1 次提交
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由 Rafael J. Wysocki 提交于
The last line of the comment preceding the definition of acpi_pci_choose_state() is incorrect. Remove it. Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl> Acked-by: NPavel Machek <pavel@ucw.cz> Signed-off-by: NLen Brown <len.brown@intel.com>
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- 16 2月, 2008 1 次提交
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由 Randy Dunlap 提交于
Fix PCI kernel-doc warning: Warning(linux-2.6.24-git12//drivers/pci/pci-acpi.c:166): No description found for parameter 'hid' Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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- 09 2月, 2008 3 次提交
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由 David Howells 提交于
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: NMasakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: NKoichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 mark gross 提交于
Fix an off by one bug in the fault reason string reporting function, and clean up some of the code around this buglet. [akpm@linux-foundation.org: cleanup] Signed-off-by: Nmark gross <mgross@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 mark gross 提交于
Add support for protected memory enable bits by clearing them if they are set at startup time. Some future boot loaders or firmware could have this bit set after it loads the kernel, and it needs to be cleared if DMA's are going to happen effectively. Signed-off-by: Nmark gross <mgross@intel.com> Acked-by: NMuli Ben-Yehuda <muli@il.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 07 2月, 2008 1 次提交
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由 David Miller 提交于
I would like to potentially move the sparc64 IOMMU code over to using the nice new drivers/pci/iova.[ch] code for free area management.. In order to do that we have to detach the IOMMU page size assumptions which only really need to exist in the intel-iommu.[ch] code. This patch attempts to implement that. [akpm@linux-foundation.org: build fix] Signed-off-by: NDavid S. Miller <davem@davemloft.net> Acked-by: NAnil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 06 2月, 2008 2 次提交
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由 FUJITA Tomonori 提交于
This adds PCI's accessor for segment_boundary_mask in device_dma_parameters. The default segment_boundary is set to 0xffffffff, same to the block layer's default value (and the scsi mid layer uses the same value). Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Greg KH <greg@kroah.com> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 FUJITA Tomonori 提交于
This adds struct device_dma_parameters in struct pci_dev and properly sets up a pointer in struct device. The default max_segment_size is set to 64K, same to the block layer's default value. Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Mostly-acked-by: NJeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Acked-by: NJens Axboe <jens.axboe@oracle.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 03 2月, 2008 3 次提交
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由 Sam Ravnborg 提交于
The following warnings were issued during build of drivers/pci with an allyesconfig build: WARNING: o-x86_64/drivers/pci/built-in.o(.text+0xdaf): Section mismatch in reference from the function pci_add_new_bus() to the function .devinit.text:pci_alloc_child_bus() WARNING: o-x86_64/drivers/pci/built-in.o(.text+0x15e2): Section mismatch in reference from the function pci_scan_single_device() to the function .devinit.text:pci_scan_device() WARNING: o-x86_64/drivers/pci/built-in.o(.text+0x1b0c5): Section mismatch in reference from the function pci_bus_assign_resources() to the function .devinit.text:pci_setup_bridge() WARNING: o-x86_64/drivers/pci/built-in.o(.text+0x1b32d): Section mismatch in reference from the function pci_bus_size_bridges() to the function .devinit.text:pci_bus_size_cardbus() Investigating each case closer it looked like all referred functions are only used in the init phase or during hotplug. So to avoid wasting too much memory in the non-hotplug case the simpler fix was to allow the fuctions to use code/data from the __devinit sections. This was done in all four case by adding the __ref annotation. Signed-off-by: NSam Ravnborg <sam@ravnborg.org> Cc: Adrian Bunk <bunk@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Sam Ravnborg 提交于
Fix following warnings: WARNING: o-x86_64/drivers/pci/built-in.o(.text+0xb054): Section mismatch in reference from the function cpci_configure_slot() to the function .devinit.text:pci_do_scan_bus() WARNING: o-x86_64/drivers/pci/built-in.o(.text+0x153ab): Section mismatch in reference from the function shpchp_configure_device() to the function .devinit.text:pci_do_scan_bus() WARNING: o-x86_64/drivers/pci/built-in.o(__ksymtab+0xc0): Section mismatch in reference from the variable __ksymtab_pci_do_scan_bus to the function .devinit.text:pci_do_scan_bus() PCI hotplug were the only user of pci_do_scan_bus() so moving this function to a separate file that is build only when we enable CONFIG_HOTPLUG_PCI. Signed-off-by: NSam Ravnborg <sam@ravnborg.org> Cc: Adrian Bunk <bunk@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Greg Kroah-Hartman 提交于
This reverts commit 6c723d5b. It caused build errors on non-x86 platforms, config file confusion, and even some boot errors on some x86-64 boxes. All around, not quite ready for prime-time :( Cc: Shaohua Li <shaohua.li@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 02 2月, 2008 5 次提交
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由 Greg Kroah-Hartman 提交于
This moves the pci_bus class device to be a real struct device and at the same time, place it in the device tree in the correct location. Note, the old "bridge" symlink is now gone, but this was a non-standard link and no userspace program used it. If you need to determine the device that the bus is on, follow the standard device symlink, or walk up the device tree. Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Greg Kroah-Hartman 提交于
Fixes a few coding style issues in the internal pci.h file Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Shaohua Li 提交于
PCI Express ASPM defines a protocol for PCI Express components in the D0 state to reduce Link power by placing their Links into a low power state and instructing the other end of the Link to do likewise. This capability allows hardware-autonomous, dynamic Link power reduction beyond what is achievable by software-only controlled power management. However, The device should be configured by software appropriately. Enabling ASPM will save power, but will introduce device latency. This patch adds ASPM support in Linux. It introduces a global policy for ASPM, a sysfs file /sys/module/pcie_aspm/parameters/policy can control it. The interface can be used as a boot option too. Currently we have below setting: -default, BIOS default setting -powersave, highest power saving mode, enable all available ASPM state and clock power management -performance, highest performance, disable ASPM and clock power management By default, the 'default' policy is used currently. In my test, power difference between powersave mode and performance mode is about 1.3w in a system with 3 PCIE links. Signed-off-by: NShaohua Li <shaohua.li@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Ian Abbott 提交于
If the fakephp driver is used to emulate removal of a PCI device by writing text string "0" to the "power" sysfs attribute file, this causes its parent directory and its contents (including the "power" file) to be deleted before the write operation returns. Unfortunately, it ends up in a deadlock waiting for itself to complete. The deadlock is as follows: sysfs_write_file calls flush_write_buffer which calls sysfs_get_active_two before calling power_write_file in pci_hotplug_core.c via the sysfs store operation. The power_write_file function calls disable_slot in fakephp.c via the slot operation. The disable_slot function calls remove_slot which calls pci_hp_deregister (back in pci_hotplug_core.c) which calls fs_remove_slot which calls sysfs_remove_file to remove the "power" file. The sysfs_remove_file function calls sysfs_hash_and_remove which calls sysfs_addrm_finish which calls sysfs_deactivate. The sysfs_deactivate function sees that something has an active reference on the sysfs_dirent (from the previous call to sysfs_get_active_two back up the call stack somewhere) so waits for the active reference to go away, which is of course impossible. The problem has been present since 2.6.21. This patch breaks the deadlock by queuing work queue items on a single- threaded work queue to remove a slot from sysfs, and to rescan the PCI buses. There is also some protection against disabling a slot that is already being removed. Signed-off-by: NIan Abbott <abbotti@mev.co.uk> Cc: Kristen Accardi <kristen.c.accardi@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 Shane Huang 提交于
SB700 SATA MSI bug will be fixed in SB700 revision A21 at hardware level, but the SB700 revision older than A21 will also be found in the market. This patch modify the original quirk commit bc38b411 instead of withdrawing it. The patch also removes quirk to 0x4395 because 0x4395 is SB800 device ID. Signed-off-by: NShane Huang <shane.huang@amd.com> Signed-off-by: NTejun Heo <htejun@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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