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path: root/drivers/pci
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2013-10-09PCI: designware: Add irq_create_mapping()Pratyush Anand
Without irq_create_mapping(), the correct IRQ number cannot be provided. In this case, it makes problems such as NULL dereference. Thus, irq_create_mapping() should be added for MSI. Suggested-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Pratyush Anand <pratyush.anand@st.com> Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-10-09PCI: designware: Make dw_pcie_rd_own_conf(), etc., staticBjorn Helgaas
The following variables and functions are used only in pcie-designware.c, so make them static: global_io_offset dw_pcie_rd_own_conf() dw_pcie_wr_own_conf() dw_pcie_setup() dw_pcie_scan_bus() dw_pcie_map_irq() Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Jingoo Han <jg1.han@samsung.com>
2013-10-09PCI: designware: Add header guardsSeungwon Jeon
Add header guards to prevent redundant inclusion. Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-10-08PCI: mvebu: make local functions staticJingoo Han
mvebu_pcie_add_bus(), mvebu_pcie_align_resource() are used only in this file. Thus, these local functions should be staticized in order to fix the following sparse warnings: drivers/pci/host/pci-mvebu.c:684:6: warning: symbol 'mvebu_pcie_add_bus' was not declared. Should it be static? drivers/pci/host/pci-mvebu.c:690:17: warning: symbol 'mvebu_pcie_align_resource' was not declared. Should it be static? Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-10-08PCI: mvebu: add I/O access wrappersSeungwon Jeon
This change adds wrapper functions for MMIO access to PCIe IP block. And some 8/16-bit access are replaced by 32-bit. Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-10-08PCI: mvebu: Dynamically detect if the PEX link is up to enable hot plugJason Gunthorpe
Otherwise hotplugging the PEX doesn't work at all since the driver detects the link state at probe time. Simply replacing the two tests of haslink with a register read is enough to fix it. Tested on kirkwood with repeated plug/unplug of the link partner. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-10-07PCI/PM: Remove pci_pm_complete()Liu Chuansheng
88d26136 ("PM: Prevent runtime suspend during system resume") removed the pm_runtime_put_sync() from pci_pm_complete() to PM core code device_complete(). Here the pci_pm_complete() is doing the same work which can be done in device_complete(), so we can remove it directly. Signed-off-by: Liu Chuansheng <chuansheng.liu@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-07PCI: Add pci_dev_show_local_cpu() to simplify codeYijing Wang
local_cpus_show() and local_cpulist_show() are almost the same. This adds a new helper function, pci_dev_show_local_cpu(), to simplify code. The same strategy is already used by cpuaffinity_show() and cpulistaffinity_show(). Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-10-07PCI: Make pci_dev_pm_ops staticSachin Kamat
pci_dev_pm_ops is local to pci-driver.c. Make it static. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-10-07PCI: Make pci_bus_attrs, pci_dev_attrs, dev_rescan_attr, dev_remove_attr, ↵Sachin Kamat
vga_attr static Local variables used only in this file are made static. [bhelgaas: also make pci_dev_attrs[] static (from Fengguang)] Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-10-07PCI: convert bus code to use dev_groupsGreg Kroah-Hartman
The dev_attrs field of struct bus_type is going away soon, dev_groups should be used instead. This converts the PCI bus code to use the correct field. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-10-07PCI: convert bus code to use drv_groupsGreg Kroah-Hartman
The drv_attrs field of struct bus_type is going away soon, drv_groups should be used instead. This converts the PCI bus code to use the correct field. Cc: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-07PCI: convert bus code to use bus_groupsGreg Kroah-Hartman
The bus_attrs field of struct bus_type is going away soon, dev_groups should be used instead. This converts the PCI bus code to use the correct field. Cc: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-04PCI: exynos: Add missing clk_disable_unprepare() on error pathWei Yongjun
Add the missing clk_disable_unprepare() before return from exynos_pcie_probe() in the error handling case. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Jingoo Han <jg1.han@samsung.com>
2013-09-30PCI: mvebu: add support for Marvell Dove SoCsSebastian Hesselbarth
This patch adds a compatible for the PCIe controller found on Marvell Dove SoCs. Binding documentation and Kconfig entry are also updated. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-09-30PCI: mvebu: add support for reset on GPIOSebastian Hesselbarth
This patch adds a check for DT passed reset-gpios property and deasserts/ asserts reset pin on probe/remove with configurable delay. Corresponding binding documentation is also updated. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-09-30PCI: mvebu: remove subsys_initcallSebastian Hesselbarth
This removes the subsys_initcall from the driver and converts it to a normal platform_driver. Also, drvdata is set and a remove functions is added to disable the clock and free resources. As pci driver removal currently is not supported, set .suppress_bind_attrs to permit unbinding. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-09-30PCI: mvebu: increment nports only for registered portsSebastian Hesselbarth
The number of ports is probed by counting the number of available child nodes. Later on, the registration of a port can fail and cause a mismatch between the ->nports counter and registered ports. This patch modifies the counting strategy, to make ->nports represent the number of registered ports instead of the number of available childs. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-09-30PCI: mvebu: move clock enable before register accessSebastian Hesselbarth
The clock passed to PCI controller found on MVEBU SoCs may come from a clock gate. This requires the clock to be enabled before any registers are accessed. Therefore, move the clock enable before register iomap to ensure it is enabled. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-09-30PCI: mvebu: add support for MSIThomas Petazzoni
This commit adds support for Message Signaled Interrupts in the Marvell PCIe host controller. The work is very simple: it simply gets a reference to the msi_chip associated to the PCIe controller thanks to the msi-parent DT property, and stores this reference in the pci_bus structure. This is enough to let the Linux PCI core use the functions of msi_chip to setup and teardown MSIs. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Thierry Reding <thierry.reding@gmail.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-09-29Merge 3.12-rc3 into driver-core-nextGreg Kroah-Hartman
We want the driver core and sysfs fixes in here to make merges and development easier. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-28PCI: Workaround missing pci_set_master in pci driversYinghai Lu
Ben Herrenschmidt found that commit 928bea964827 ("PCI: Delay enabling bridges until they're needed") breaks PCI in some powerpc environments. The reason is that the PCIe port driver will call pci_enable_device() on the bridge, so the device is enabled, but skips pci_set_master because pcie_port_auto and no acpi on powerpc. Because of that, pci_enable_bridge() later on (called as a result of the child device driver doing pci_enable_device) will see the bridge as already enabled and will not call pci_set_master() on it. Fixed by add checking in pci_enable_bridge, and call pci_set_master if driver skip that. That will make the code more robot and wade off problem for missing pci_set_master in drivers. Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-27Merge branch 'pci/misc' into nextBjorn Helgaas
* pci/misc: PCI: Remove unused PCI_MSIX_FLAGS_BIRMASK definition PCI: acpiphp_ibm: Convert to dynamic debug PCI: acpiphp: Convert to dynamic debug PCI: Remove Intel Haswell D3 delays PCI: Pass type, width, and prefetchability for window alignment PCI: Document reason for using pci_is_root_bus() PCI: Use pci_is_root_bus() to check for root bus PCI: Remove unused "is_pcie" from pci_dev structure PCI: Update pci_find_slot() description in pci.txt [SCSI] qla2xxx: Use standard PCIe Capability Link register field names PCI: Fix comment typo, remove unnecessary !! in pci_is_pcie() PCI: Drop "setting latency timer" messages
2013-09-27Merge branch 'pci/host-tegra' into nextBjorn Helgaas
* pci/host-tegra: PCI: tegra: Add missing __iomem annotation
2013-09-27Merge branch 'pci/host-imx6' into nextBjorn Helgaas
* pci/host-imx6: PCI: imx6: Add support for i.MX6 PCIe controller ARM: imx6q: Add PCIe bits to GPR syscon definition
2013-09-27PCI: imx6: Add support for i.MX6 PCIe controllerSean Cross
Add support for the PCIe port present on the i.MX6 family of controllers. These use the Synopsis Designware core tied to their own PHY. Signed-off-by: Sean Cross <xobs@kosagi.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
2013-09-27Merge branch 'pci/host-exynos' into nextBjorn Helgaas
* pci/host-exynos: PCI: exynos: Turn off power of phy block when link failed PCI: exynos: Add support for MSI MAINTAINERS: Add Jingoo Han as Samsung Exynos PCIe driver maintainer
2013-09-26PCI: convert bus code to use drv_groupsGreg Kroah-Hartman
The drv_attrs field of struct bus_type is going away soon, drv_groups should be used instead. This converts the PCI bus code to use the correct field. Cc: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26PCI: convert bus code to use bus_groupsGreg Kroah-Hartman
The bus_attrs field of struct bus_type is going away soon, dev_groups should be used instead. This converts the PCI bus code to use the correct field. Cc: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-25PCI: acpiphp_ibm: Convert to dynamic debugLan Tianyu
This patch is to use pr_debug/info/warn/err to replace acpiphp_ibm debug functions and remove module's debug param. User interface change: before this patch, boot with the "acpiphp_ibm.debug" kernel parameter to turn on debug. After this patch, set CONFIG_DYNAMIC_DEBUG=y and boot with "acpiphp_ibm.dyndebug=+p" instead. See Documentation/dynamic-debug-howto.txt. [bhelgaas: changelog] Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-25PCI: acpiphp: Convert to dynamic debugLan Tianyu
This patch is to use pr_debug/info/warn/err to replace acpiphp debug functions and remove module's debug param. User interface change: before this patch, boot with the "acpiphp.debug" kernel parameter to turn on debug. After this patch, set CONFIG_DYNAMIC_DEBUG=y and boot with "acpiphp.dyndebug=+p" instead. See Documentation/dynamic-debug-howto.txt. [bhelgaas: changelog] Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-25PCI: tegra: Add missing __iomem annotationJingoo Han
Added missing __iomem annotation in order to fix the following sparse warnings: drivers/pci/host/pci-tegra.c:411:41: warning: incorrect type in return expression (different address spaces) drivers/pci/host/pci-tegra.c:411:41: expected void [noderef] <asn:2>* drivers/pci/host/pci-tegra.c:411:41: got void *addr drivers/pci/host/pci-tegra.c:419:25: warning: incorrect type in return expression (different address spaces) drivers/pci/host/pci-tegra.c:419:25: expected void [noderef] <asn:2>* drivers/pci/host/pci-tegra.c:419:25: got void *addr Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Thierry Reding <treding@nvidia.com>
2013-09-25PCI: exynos: Turn off power of phy block when link failedJingoo Han
When link failed, there is no need to turn on phy block. Also, turning on phy block is added, in order to turn on phy block regardless of the default value of phy registers. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-25PCI: exynos: Add support for MSIJingoo Han
This patch adds support for Message Signaled Interrupt in the Exynos PCIe driver using Synopsys designware PCIe core IP. Signed-off-by: Siva Reddy Kallam <siva.kallam@samsung.com> Signed-off-by: Srikanth T Shivanand <ts.srikanth@samsung.com> Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Pratyush Anand <pratyush.anand@st.com> Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
2013-09-25PCI: Remove Intel Haswell D3 delaysTodd E Brandt
The latest Intel Haswell chipsets have a hardware optimization which allows on-chip PCI devices to ignore the 10ms delay before entering or exiting D3 suspend. This patch implements the optimization as a PCI quirk, since we want tight control over which devices use it. This way we can test each device individually to be sure there are no issues before we enable the quirk. The first set of devices are from the Haswell platform, which includes every PCI device that is on the northbridge and southbridge. This patch reduces the Haswell suspend time from 93 ms to 47 ms and resume time from 160 ms to 64 ms. Signed-off-by: Todd Brandt <todd.e.brandt@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-09-25PCI: Pass type, width, and prefetchability for window alignmentWei Yang
When calculating window_alignment(), type information like IORESOURCE_MEM and IORESOURCE_PREFETCH may not be enough. For example, on powernv, we need to know whether the window is 64-bit or not. This patch passes the full resource type (res->flags) for window alignment. [bhelgaas: changelog] Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Gavin Shan <shangw@linux.vnet.ibm.com>
2013-09-25PCI: Use pci_is_root_bus() to check for root busWei Yang
In __pci_bus_size_bridges() we check whether a bus is a root bus by testing bus->self. As indicated by commit 79af72d7 ("PCI: pci_is_root_bus helper"), bus->self == NULL is not a proper way to check for a root bus. One issue is that "virtual" buses added for SR-IOV (via virtfn_add_bus()) have bus->self == NULL but are not root buses. This patch changes it to pci_is_root_bus() to check whether it is a root bus. [bhelgaas: changelog] Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-25PCI: Remove unused "is_pcie" from pci_dev structureYijing Wang
No one uses "is_pcie" now; remove this obsolete member. Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-25PCI: Drop "setting latency timer" messagesBjorn Helgaas
This message isn't useful any more, so drop it. Reference: https://bugzilla.kernel.org/show_bug.cgi?id=60636 Reported-by: Oleksil Shevchuk <alxchk@gmail.com> Reference: http://lkml.kernel.org/r/CALCETrWkr53ZjqdN3t7rTTfr=+ZKZXJoYsuBcwPf0kN_33GfAw@mail.gmail.com Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-24PCI: Export pcie_set_mps() and pcie_get_mps()Yijing Wang
Export pcie_get_mps() and pcie_set_mps() functions so drivers can use them to simplify code. Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-23Merge branch 'pci/yijing-pci_is_pcie-v2' into nextBjorn Helgaas
* pci/yijing-pci_is_pcie-v2: powerpc/pci: Use pci_is_pcie() to simplify code [SCSI] qla2xxx: Use pcie_is_pcie() to simplify code [SCSI] csiostor: Use pcie_capability_clear_and_set_word() to simplify code [SCSI] bfa: Use pcie_set()/get_readrq() to simplify code x86/pci: Use cached pci_dev->pcie_cap to simplify code PCI: Use pci_is_pcie() to simplify code
2013-09-23PCI/ACPI: Name _OSC #defines more consistentlyBjorn Helgaas
Make PCI Host Bridge _OSC #defines more consistent. No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-09-24pci-acpi: convert acpi_get_handle() to acpi_has_method()Zhang Rui
acpi_has_method() is a new ACPI API introduced to check the existence of an ACPI control method. It can be used to replace acpi_get_handle() in the case that 1. the calling function doesn't need the ACPI handle of the control method. and 2. the calling function doesn't care the reason why the method is unavailable. Convert acpi_get_handle() to acpi_has_method() in drivers/pci/pci-acpi.c in this patch. Signed-off-by: Zhang Rui <rui.zhang@intel.com> CC: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-09-24acpi_pcihp: convert acpi_get_handle() to acpi_has_method()Zhang Rui
acpi_has_method() is a new ACPI API introduced to check the existence of an ACPI control method. It can be used to replace acpi_get_handle() in the case that 1. the calling function doesn't need the ACPI handle of the control method. and 2. the calling function doesn't care the reason why the method is unavailable. Convert acpi_get_handle() to acpi_has_method() in drivers/pci/hotplug/acpi_pcihp.c in this patch. Signed-off-by: Zhang Rui <rui.zhang@intel.com> CC: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-09-23PCI: Use pci_is_pcie() to simplify codeYijing Wang
Use pci_is_pcie() instead of pci_find_capability() to simplify code. Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-09-20PCI / ACPI / PM: Clear pme_poll for devices in D3cold on wakeupRafael J. Wysocki
Commit 448bd85 (PCI/PM: add PCIe runtime D3cold support) added a piece of code to pci_acpi_wake_dev() causing that function to behave in a special way for devices in D3cold (so that their configuration registers are not accessed before those devices are resumed). However, it didn't take the clearing of the pme_poll flag into account. That has to be done for all devices, even if they are in D3cold, or pci_pme_list_scan() will not know that wakeup has been signaled for the device and will poll its PME Status bit unnecessarily. Fix the problem by moving the clearing of the pme_poll flag in pci_acpi_wake_dev() before the code introduced by commit 448bd85. Reported-and-tested-by: David E. Box <david.e.box@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Cc: 3.6+ <stable@vger.kernel.org> # 3.6+
2013-09-13Remove GENERIC_HARDIRQ config optionMartin Schwidefsky
After the last architecture switched to generic hard irqs the config options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code for !CONFIG_GENERIC_HARDIRQS can be removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-09-12Merge tag 'pm+acpi-fixes-3.12-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI and power management fixes from Rafael Wysocki: "All of these commits are fixes that have emerged recently and some of them fix bugs introduced during this merge window. Specifics: 1) ACPI-based PCI hotplug (ACPIPHP) fixes related to spurious events After the recent ACPIPHP changes we've seen some interesting breakage on a system that triggers device check notifications during boot for non-existing devices. Although those notifications are really spurious, we should be able to deal with them nevertheless and that shouldn't introduce too much overhead. Four commits to make that work properly. 2) Memory hotplug and hibernation mutual exclusion rework This was maent to be a cleanup, but it happens to fix a classical ABBA deadlock between system suspend/hibernation and ACPI memory hotplug which is possible if they are started roughly at the same time. Three commits rework memory hotplug so that it doesn't acquire pm_mutex and make hibernation use device_hotplug_lock which prevents it from racing with memory hotplug. 3) ACPI Intel LPSS (Low-Power Subsystem) driver crash fix The ACPI LPSS driver crashes during boot on Apple Macbook Air with Haswell that has slightly unusual BIOS configuration in which one of the LPSS device's _CRS method doesn't return all of the information expected by the driver. Fix from Mika Westerberg, for stable. 4) ACPICA fix related to Store->ArgX operation AML interpreter fix for obscure breakage that causes AML to be executed incorrectly on some machines (observed in practice). From Bob Moore. 5) ACPI core fix for PCI ACPI device objects lookup There still are cases in which there is more than one ACPI device object matching a given PCI device and we don't choose the one that the BIOS expects us to choose, so this makes the lookup take more criteria into account in those cases. 6) Fix to prevent cpuidle from crashing in some rare cases If the result of cpuidle_get_driver() is NULL, which can happen on some systems, cpuidle_driver_ref() will crash trying to use that pointer and the Daniel Fu's fix prevents that from happening. 7) cpufreq fixes related to CPU hotplug Stephen Boyd reported a number of concurrency problems with cpufreq related to CPU hotplug which are addressed by a series of fixes from Srivatsa S Bhat and Viresh Kumar. 8) cpufreq fix for time conversion in time_in_state attribute Time conversion carried out by cpufreq when user space attempts to read /sys/devices/system/cpu/cpu*/cpufreq/stats/time_in_state won't work correcty if cputime_t doesn't map directly to jiffies. Fix from Andreas Schwab. 9) Revert of a troublesome cpufreq commit Commit 7c30ed5 (cpufreq: make sure frequency transitions are serialized) was intended to address some known concurrency problems in cpufreq related to the ordering of transitions, but unfortunately it introduced several problems of its own, so I decided to revert it now and address the original problems later in a more robust way. 10) Intel Haswell CPU models for intel_pstate from Nell Hardcastle. 11) cpufreq fixes related to system suspend/resume The recent cpufreq changes that made it preserve CPU sysfs attributes over suspend/resume cycles introduced a possible NULL pointer dereference that caused it to crash during the second attempt to suspend. Three commits from Srivatsa S Bhat fix that problem and a couple of related issues. 12) cpufreq locking fix cpufreq_policy_restore() should acquire the lock for reading, but it acquires it for writing. Fix from Lan Tianyu" * tag 'pm+acpi-fixes-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (25 commits) cpufreq: Acquire the lock in cpufreq_policy_restore() for reading cpufreq: Prevent problems in update_policy_cpu() if last_cpu == new_cpu cpufreq: Restructure if/else block to avoid unintended behavior cpufreq: Fix crash in cpufreq-stats during suspend/resume intel_pstate: Add Haswell CPU models Revert "cpufreq: make sure frequency transitions are serialized" cpufreq: Use signed type for 'ret' variable, to store negative error values cpufreq: Remove temporary fix for race between CPU hotplug and sysfs-writes cpufreq: Synchronize the cpufreq store_*() routines with CPU hotplug cpufreq: Invoke __cpufreq_remove_dev_finish() after releasing cpu_hotplug.lock cpufreq: Split __cpufreq_remove_dev() into two parts cpufreq: Fix wrong time unit conversion cpufreq: serialize calls to __cpufreq_governor() cpufreq: don't allow governor limits to be changed when it is disabled ACPI / bind: Prefer device objects with _STA to those without it ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checks ACPI / hotplug / PCI: Use _OST to notify firmware about notify status ACPI / hotplug / PCI: Avoid doing too much for spurious notifies ACPICA: Fix for a Store->ArgX when ArgX contains a reference to a field. ACPI / hotplug / PCI: Don't trim devices before scanning the namespace ...
2013-09-10Merge branch 'acpi-pci-hotplug'Rafael J. Wysocki
* acpi-pci-hotplug: ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checks ACPI / hotplug / PCI: Use _OST to notify firmware about notify status ACPI / hotplug / PCI: Avoid doing too much for spurious notifies ACPI / hotplug / PCI: Don't trim devices before scanning the namespace
2013-09-09ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checksRafael J. Wysocki
In the current ACPIPHP notify handler we always go directly for a rescan of the parent bus if we get a device check notification for a device that is not a bridge. However, this obviously is overzealous if nothing really changes, because this way we may rescan the whole PCI hierarchy pretty much in vain. That happens on Alex Williamson's machine whose ACPI tables contain device objects that are supposed to coresspond to PCIe root ports, but those ports aren't physically present (or at least they aren't visible in the PCI config space to us). The BIOS generates multiple device check notifies for those objects during boot and for each of them we go straight for the parent bus rescan, but the parent bus is the root bus in this particular case. In consequence, we rescan the whole PCI bus from the top several times in a row, which is completely unnecessary, increases boot time by 50% (after previous fixes) and generates excess dmesg output from the PCI subsystem. Fix the problem by checking if we can find anything new in the slot corresponding to the device we've got a device check notify for and doing nothig if that's not the case. The spec (ACPI 5.0, Section 5.6.6) appears to mandate this behavior, as it says: Device Check. Used to notify OSPM that the device either appeared or disappeared. If the device has appeared, OSPM will re-enumerate from the parent. If the device has disappeared, OSPM will invalidate the state of the device. OSPM may optimize out re-enumeration. Therefore, according to the spec, we are free to do nothing if nothing changes. References: https://bugzilla.kernel.org/show_bug.cgi?id=60865 Reported-and-tested-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
generated by cgit (git 2.34.1) at 2025-09-14 16:30:26 +0000