| Message ID | 1364545211.1817.228.camel@yhuang-dev (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Huang Ying wrote: > On Thu, 2013-03-28 at 19:38 +0100, Martin Mokrejs wrote: >> Hi Ying, >> would you please tell me how this report relate to this patch? >> >> [PATCH] PCI / ACPI: Always resume devices on ACPI wakeup notifications >> >> Could you tell me why this PME was being flipped back and forth now? >> Actually, does that make finally some sense to you, pci/acpi devs? >> >> >> Does is help to say that on the SandyBridge chip I have the following root ports >> hooked to the following end devices?: >> >> 1.c1 -> rtl8169 05:00.0 >> 1.c3 -> iwlwifi 09:00.0 >> 1.c4 -> xhci_hcd 0b:00.0 >> 1.c7 -> 00:11: express card slot >> >> >> Why didn't I see interleraved lines with 1.c7 *and* 00:11? See the interleaving >> happening with the network card on 3.7.10 kernel (not broken kernel): >> >> [138268.870070] r8169 0000:05:00.0 eth0: link down >> [138270.809811] r8169 0000:05:00.0 eth0: link up >> [138365.599744] r8169 0000:05:00.0 eth0: link down >> [138370.594343] r8169 0000:05:00.0: PME# enabled >> [138370.623852] pcieport 0000:00:1c.1: PME# enabled >> [169885.247386] pcieport 0000:00:1c.1: PME# disabled >> [169885.267374] r8169 0000:05:00.0: PME# disabled >> [169885.330160] r8169 0000:05:00.0 eth0: link down >> [169886.992531] r8169 0000:05:00.0 eth0: link up >> [169904.405769] r8169 0000:05:00.0 eth0: link down >> [169909.401237] r8169 0000:05:00.0: PME# enabled >> [169909.430782] pcieport 0000:00:1c.1: PME# enabled >> [170090.538980] pcieport 0000:00:1c.1: PME# disabled >> [170090.559088] r8169 0000:05:00.0: PME# disabled >> [170090.640494] r8169 0000:05:00.0: PME# enabled >> [170090.678425] pcieport 0000:00:1c.1: PME# enabled >> [170090.829959] pcieport 0000:00:1c.1: PME# disabled >> [170090.848479] r8169 0000:05:00.0: PME# disabled >> [170090.892011] r8169 0000:05:00.0 eth0: link down >> [170090.892134] r8169 0000:05:00.0 eth0: link down >> [170090.930998] r8169 0000:05:00.0 eth0: link down >> [170092.554553] r8169 0000:05:00.0 eth0: link up > > I don't know exactly. Can you give me the follow output? > > grep . /sys/bus/pci/devices/*/power/control > grep . /sys/bus/pci/devices/*/power/runtime_status Hi Ying, here is the output from the not-broken 3.7.10 kernel: vostro ~ # uname -a Linux vostro 3.7.10-default #2 SMP Tue Mar 5 09:52:12 MET 2013 x86_64 Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz GenuineIntel GNU/Linux vostro ~ # grep . /sys/bus/pci/devices/*/power/control /sys/bus/pci/devices/0000:00:00.0/power/control:auto /sys/bus/pci/devices/0000:00:02.0/power/control:auto /sys/bus/pci/devices/0000:00:16.0/power/control:auto /sys/bus/pci/devices/0000:00:1a.0/power/control:auto /sys/bus/pci/devices/0000:00:1b.0/power/control:auto /sys/bus/pci/devices/0000:00:1c.0/power/control:auto /sys/bus/pci/devices/0000:00:1c.1/power/control:auto /sys/bus/pci/devices/0000:00:1c.3/power/control:auto /sys/bus/pci/devices/0000:00:1c.4/power/control:auto /sys/bus/pci/devices/0000:00:1c.7/power/control:auto /sys/bus/pci/devices/0000:00:1d.0/power/control:auto /sys/bus/pci/devices/0000:00:1f.0/power/control:auto /sys/bus/pci/devices/0000:00:1f.2/power/control:auto /sys/bus/pci/devices/0000:00:1f.3/power/control:auto /sys/bus/pci/devices/0000:05:00.0/power/control:auto /sys/bus/pci/devices/0000:09:00.0/power/control:auto /sys/bus/pci/devices/0000:0b:00.0/power/control:auto /sys/bus/pci/devices/0000:11:00.0/power/control:auto vostro ~ # grep . /sys/bus/pci/devices/*/power/runtime_status /sys/bus/pci/devices/0000:00:00.0/power/runtime_status:suspended /sys/bus/pci/devices/0000:00:02.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:16.0/power/runtime_status:suspended /sys/bus/pci/devices/0000:00:1a.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1b.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.0/power/runtime_status:suspended /sys/bus/pci/devices/0000:00:1c.1/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.3/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.4/power/runtime_status:active /sys/bus/pci/devices/0000:00:1c.7/power/runtime_status:active /sys/bus/pci/devices/0000:00:1d.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1f.0/power/runtime_status:active /sys/bus/pci/devices/0000:00:1f.2/power/runtime_status:active /sys/bus/pci/devices/0000:00:1f.3/power/runtime_status:suspended /sys/bus/pci/devices/0000:05:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:09:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:0b:00.0/power/runtime_status:active /sys/bus/pci/devices/0000:11:00.0/power/runtime_status:active vostro ~ # Now will go and test your patch for the 3.9-rc1 PME# storm when the coldplugged eSATA is unplugged and rmmod sata_sil24 triggers the messages. Martin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 2013-03-29 at 14:08 +0100, Martin Mokrejs wrote: > > Huang Ying wrote: > > On Thu, 2013-03-28 at 19:38 +0100, Martin Mokrejs wrote: > >> Hi Ying, > >> would you please tell me how this report relate to this patch? > >> > >> [PATCH] PCI / ACPI: Always resume devices on ACPI wakeup notifications > >> > >> Could you tell me why this PME was being flipped back and forth now? > >> Actually, does that make finally some sense to you, pci/acpi devs? > >> > >> > >> Does is help to say that on the SandyBridge chip I have the following root ports > >> hooked to the following end devices?: > >> > >> 1.c1 -> rtl8169 05:00.0 > >> 1.c3 -> iwlwifi 09:00.0 > >> 1.c4 -> xhci_hcd 0b:00.0 > >> 1.c7 -> 00:11: express card slot > >> > >> > >> Why didn't I see interleraved lines with 1.c7 *and* 00:11? See the interleaving > >> happening with the network card on 3.7.10 kernel (not broken kernel): > >> > >> [138268.870070] r8169 0000:05:00.0 eth0: link down > >> [138270.809811] r8169 0000:05:00.0 eth0: link up > >> [138365.599744] r8169 0000:05:00.0 eth0: link down > >> [138370.594343] r8169 0000:05:00.0: PME# enabled > >> [138370.623852] pcieport 0000:00:1c.1: PME# enabled > >> [169885.247386] pcieport 0000:00:1c.1: PME# disabled > >> [169885.267374] r8169 0000:05:00.0: PME# disabled > >> [169885.330160] r8169 0000:05:00.0 eth0: link down > >> [169886.992531] r8169 0000:05:00.0 eth0: link up > >> [169904.405769] r8169 0000:05:00.0 eth0: link down > >> [169909.401237] r8169 0000:05:00.0: PME# enabled > >> [169909.430782] pcieport 0000:00:1c.1: PME# enabled > >> [170090.538980] pcieport 0000:00:1c.1: PME# disabled > >> [170090.559088] r8169 0000:05:00.0: PME# disabled > >> [170090.640494] r8169 0000:05:00.0: PME# enabled > >> [170090.678425] pcieport 0000:00:1c.1: PME# enabled > >> [170090.829959] pcieport 0000:00:1c.1: PME# disabled > >> [170090.848479] r8169 0000:05:00.0: PME# disabled > >> [170090.892011] r8169 0000:05:00.0 eth0: link down > >> [170090.892134] r8169 0000:05:00.0 eth0: link down > >> [170090.930998] r8169 0000:05:00.0 eth0: link down > >> [170092.554553] r8169 0000:05:00.0 eth0: link up > > > > I don't know exactly. Can you give me the follow output? > > > > grep . /sys/bus/pci/devices/*/power/control > > grep . /sys/bus/pci/devices/*/power/runtime_status > > > Hi Ying, > here is the output from the not-broken 3.7.10 kernel: > > vostro ~ # uname -a > Linux vostro 3.7.10-default #2 SMP Tue Mar 5 09:52:12 MET 2013 x86_64 Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz GenuineIntel GNU/Linux > vostro ~ # grep . /sys/bus/pci/devices/*/power/control > /sys/bus/pci/devices/0000:00:00.0/power/control:auto > /sys/bus/pci/devices/0000:00:02.0/power/control:auto > /sys/bus/pci/devices/0000:00:16.0/power/control:auto > /sys/bus/pci/devices/0000:00:1a.0/power/control:auto > /sys/bus/pci/devices/0000:00:1b.0/power/control:auto > /sys/bus/pci/devices/0000:00:1c.0/power/control:auto > /sys/bus/pci/devices/0000:00:1c.1/power/control:auto > /sys/bus/pci/devices/0000:00:1c.3/power/control:auto > /sys/bus/pci/devices/0000:00:1c.4/power/control:auto > /sys/bus/pci/devices/0000:00:1c.7/power/control:auto > /sys/bus/pci/devices/0000:00:1d.0/power/control:auto > /sys/bus/pci/devices/0000:00:1f.0/power/control:auto > /sys/bus/pci/devices/0000:00:1f.2/power/control:auto > /sys/bus/pci/devices/0000:00:1f.3/power/control:auto > /sys/bus/pci/devices/0000:05:00.0/power/control:auto > /sys/bus/pci/devices/0000:09:00.0/power/control:auto > /sys/bus/pci/devices/0000:0b:00.0/power/control:auto > /sys/bus/pci/devices/0000:11:00.0/power/control:auto I guess you use laptop-mode-tool to turn on runtime PM for all PCI devices. Is possible for you to turn off runtime PM for PCI devices in laptop-mode-tool if you use it or by hand as follow and test it again to check whether it is related to runtime PM support? runtime PM for PCI devices can be turned off via the following command line as root: for ctrl in /sys/bus/pci/devices/*/power/control; do echo on > $ctrl done Best Regards, Huang Ying > vostro ~ # grep . /sys/bus/pci/devices/*/power/runtime_status > /sys/bus/pci/devices/0000:00:00.0/power/runtime_status:suspended > /sys/bus/pci/devices/0000:00:02.0/power/runtime_status:active > /sys/bus/pci/devices/0000:00:16.0/power/runtime_status:suspended > /sys/bus/pci/devices/0000:00:1a.0/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1b.0/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1c.0/power/runtime_status:suspended > /sys/bus/pci/devices/0000:00:1c.1/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1c.3/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1c.4/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1c.7/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1d.0/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1f.0/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1f.2/power/runtime_status:active > /sys/bus/pci/devices/0000:00:1f.3/power/runtime_status:suspended > /sys/bus/pci/devices/0000:05:00.0/power/runtime_status:active > /sys/bus/pci/devices/0000:09:00.0/power/runtime_status:active > /sys/bus/pci/devices/0000:0b:00.0/power/runtime_status:active > /sys/bus/pci/devices/0000:11:00.0/power/runtime_status:active > vostro ~ # > > > > Now will go and test your patch for the 3.9-rc1 PME# storm when the coldplugged eSATA > is unplugged and rmmod sata_sil24 triggers the messages. > > Martin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Huang Ying wrote: > On Fri, 2013-03-29 at 14:08 +0100, Martin Mokrejs wrote: >> >> Huang Ying wrote: >>> On Thu, 2013-03-28 at 19:38 +0100, Martin Mokrejs wrote: >>>> Hi Ying, >>>> would you please tell me how this report relate to this patch? >>>> >>>> [PATCH] PCI / ACPI: Always resume devices on ACPI wakeup notifications >>>> >>>> Could you tell me why this PME was being flipped back and forth now? >>>> Actually, does that make finally some sense to you, pci/acpi devs? >>>> >>>> >>>> Does is help to say that on the SandyBridge chip I have the following root ports >>>> hooked to the following end devices?: >>>> >>>> 1.c1 -> rtl8169 05:00.0 >>>> 1.c3 -> iwlwifi 09:00.0 >>>> 1.c4 -> xhci_hcd 0b:00.0 >>>> 1.c7 -> 00:11: express card slot >>>> >>>> >>>> Why didn't I see interleraved lines with 1.c7 *and* 00:11? See the interleaving >>>> happening with the network card on 3.7.10 kernel (not broken kernel): >>>> >>>> [138268.870070] r8169 0000:05:00.0 eth0: link down >>>> [138270.809811] r8169 0000:05:00.0 eth0: link up >>>> [138365.599744] r8169 0000:05:00.0 eth0: link down >>>> [138370.594343] r8169 0000:05:00.0: PME# enabled >>>> [138370.623852] pcieport 0000:00:1c.1: PME# enabled >>>> [169885.247386] pcieport 0000:00:1c.1: PME# disabled >>>> [169885.267374] r8169 0000:05:00.0: PME# disabled >>>> [169885.330160] r8169 0000:05:00.0 eth0: link down >>>> [169886.992531] r8169 0000:05:00.0 eth0: link up >>>> [169904.405769] r8169 0000:05:00.0 eth0: link down >>>> [169909.401237] r8169 0000:05:00.0: PME# enabled >>>> [169909.430782] pcieport 0000:00:1c.1: PME# enabled >>>> [170090.538980] pcieport 0000:00:1c.1: PME# disabled >>>> [170090.559088] r8169 0000:05:00.0: PME# disabled >>>> [170090.640494] r8169 0000:05:00.0: PME# enabled >>>> [170090.678425] pcieport 0000:00:1c.1: PME# enabled >>>> [170090.829959] pcieport 0000:00:1c.1: PME# disabled >>>> [170090.848479] r8169 0000:05:00.0: PME# disabled >>>> [170090.892011] r8169 0000:05:00.0 eth0: link down >>>> [170090.892134] r8169 0000:05:00.0 eth0: link down >>>> [170090.930998] r8169 0000:05:00.0 eth0: link down >>>> [170092.554553] r8169 0000:05:00.0 eth0: link up >>> >>> I don't know exactly. Can you give me the follow output? >>> >>> grep . /sys/bus/pci/devices/*/power/control >>> grep . /sys/bus/pci/devices/*/power/runtime_status >> >> >> Hi Ying, >> here is the output from the not-broken 3.7.10 kernel: >> >> vostro ~ # uname -a >> Linux vostro 3.7.10-default #2 SMP Tue Mar 5 09:52:12 MET 2013 x86_64 Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz GenuineIntel GNU/Linux >> vostro ~ # grep . /sys/bus/pci/devices/*/power/control >> /sys/bus/pci/devices/0000:00:00.0/power/control:auto >> /sys/bus/pci/devices/0000:00:02.0/power/control:auto >> /sys/bus/pci/devices/0000:00:16.0/power/control:auto >> /sys/bus/pci/devices/0000:00:1a.0/power/control:auto >> /sys/bus/pci/devices/0000:00:1b.0/power/control:auto >> /sys/bus/pci/devices/0000:00:1c.0/power/control:auto >> /sys/bus/pci/devices/0000:00:1c.1/power/control:auto >> /sys/bus/pci/devices/0000:00:1c.3/power/control:auto >> /sys/bus/pci/devices/0000:00:1c.4/power/control:auto >> /sys/bus/pci/devices/0000:00:1c.7/power/control:auto >> /sys/bus/pci/devices/0000:00:1d.0/power/control:auto >> /sys/bus/pci/devices/0000:00:1f.0/power/control:auto >> /sys/bus/pci/devices/0000:00:1f.2/power/control:auto >> /sys/bus/pci/devices/0000:00:1f.3/power/control:auto >> /sys/bus/pci/devices/0000:05:00.0/power/control:auto >> /sys/bus/pci/devices/0000:09:00.0/power/control:auto >> /sys/bus/pci/devices/0000:0b:00.0/power/control:auto >> /sys/bus/pci/devices/0000:11:00.0/power/control:auto > > I guess you use laptop-mode-tool to turn on runtime PM for all PCI > devices. Is possible for you to turn off runtime PM for PCI devices in > laptop-mode-tool if you use it or by hand as follow and test it again to > check whether it is related to runtime PM support? > > runtime PM for PCI devices can be turned off via the following command > line as root: > > for ctrl in /sys/bus/pci/devices/*/power/control; do > echo on > $ctrl > done > Hmm, the startup script claimed that while on AC they are turned off. Here is part of my /etc/laptop-mode/laptop-mode.conf # # Enable laptop mode when on battery power. # ENABLE_LAPTOP_MODE_ON_BATTERY=1 # # Enable laptop mode when on AC power. # ENABLE_LAPTOP_MODE_ON_AC=0 # # Enable laptop mode when the laptop's lid is closed, even when we're on AC # power? (ACPI-ONLY) # ENABLE_LAPTOP_MODE_WHEN_LID_CLOSED=0 # # Enable all simple zero-configuration auto modules # This option enables all simple modules (listed below) without requiring # the user to enable each module individually # # List of modules which can be automatically enabled with this setting are: # # ac97-powersave # cpufreq # dpms-standby # eee-superhe # ethernet # exec-commands # hal-polling # hdparm # intel-hda-powersave # intel-sata-powermgmt # nmi-watchdog # runtime-pm # sched-mc-power-savings # sched-smt-power-savings # terminal-blanking # usb-autosuspend # wireless-ipw-power # wireless-iwl-power # wireless-power # # Set this to 1 to enable all simple zero-configuration auto modules listed above. # # NOTE: You can explicitly enable/disable any of the above modules by changing their # values in the individual settings file # ENABLE_AUTO_MODULES=1 OK, will uninstall app-laptop/laptop-mode-tools-1.62-r1 now. I am sorry for the confusion. > Best Regards, > Huang Ying > >> vostro ~ # grep . /sys/bus/pci/devices/*/power/runtime_status >> /sys/bus/pci/devices/0000:00:00.0/power/runtime_status:suspended >> /sys/bus/pci/devices/0000:00:02.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:16.0/power/runtime_status:suspended >> /sys/bus/pci/devices/0000:00:1a.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1b.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1c.0/power/runtime_status:suspended >> /sys/bus/pci/devices/0000:00:1c.1/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1c.3/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1c.4/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1c.7/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1d.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1f.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1f.2/power/runtime_status:active >> /sys/bus/pci/devices/0000:00:1f.3/power/runtime_status:suspended >> /sys/bus/pci/devices/0000:05:00.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:09:00.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:0b:00.0/power/runtime_status:active >> /sys/bus/pci/devices/0000:11:00.0/power/runtime_status:active >> vostro ~ # >> >> >> >> Now will go and test your patch for the 3.9-rc1 PME# storm when the coldplugged eSATA >> is unplugged and rmmod sata_sil24 triggers the messages. >> >> Martin > > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c index 202f4a9..7d4cf1a 100644 --- a/drivers/pci/hotplug/pci_hotplug_core.c +++ b/drivers/pci/hotplug/pci_hotplug_core.c @@ -39,6 +39,7 @@ #include <linux/mutex.h> #include <linux/pci.h> #include <linux/pci_hotplug.h> +#include <linux/pm_runtime.h> #include <asm/uaccess.h> #include "../pci.h" @@ -473,6 +474,8 @@ int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, dbg("Added slot %s to the list\n", name); out: mutex_unlock(&pci_hp_mutex); + /* Bridge runtime PM state may be influenced by hotplug */ + pm_runtime_resume(&bus->self->dev); return result; } @@ -489,6 +492,7 @@ int pci_hp_deregister(struct hotplug_slot *hotplug) { struct hotplug_slot *temp; struct pci_slot *slot; + struct pci_bus *bus; if (!hotplug) return -ENODEV; @@ -508,8 +512,10 @@ int pci_hp_deregister(struct hotplug_slot *hotplug) hotplug->release(hotplug); slot->hotplug = NULL; + bus = slot->bus; pci_destroy_slot(slot); mutex_unlock(&pci_hp_mutex); + pm_runtime_resume(&bus->self->dev); return 0; } diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index 08c243a..beb9c90 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -154,9 +154,11 @@ static int pcie_port_runtime_idle(struct device *dev) */ pci_walk_bus(pdev->subordinate, pci_dev_pme_poll, &pme_poll); /* Delay for a short while to prevent too frequent suspend/resume */ - if (!pme_poll) - pm_schedule_suspend(dev, 10); - return -EBUSY; + if (pme_poll) + return -EBUSY; + if (pci_bus_has_hotplug_slots(pdev->subordinate)) + return -EBUSY; + return pm_schedule_suspend(dev, 10); } #else #define pcie_port_runtime_suspend NULL diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index ac6412f..10b275b 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -345,6 +345,24 @@ out: } EXPORT_SYMBOL_GPL(pci_renumber_slot); +bool pci_bus_has_hotplug_slots(struct pci_bus *bus) +{ + struct pci_slot *slot; + bool has_hotplug_slots = false; + + down_read(&pci_bus_sem); + list_for_each_entry(slot, &bus->slots, list) { + if (slot->hotplug) { + has_hotplug_slots = true; + break; + } + } + up_read(&pci_bus_sem); + + return has_hotplug_slots; +} +EXPORT_SYMBOL_GPL(pci_bus_has_hotplug_slots); + /** * pci_destroy_slot - decrement refcount for physical PCI slot * @slot: struct pci_slot to decrement diff --git a/include/linux/pci.h b/include/linux/pci.h index 2461033a..0d0cc94 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -722,6 +722,7 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, void pci_destroy_slot(struct pci_slot *slot); void pci_renumber_slot(struct pci_slot *slot, int slot_nr); int pci_scan_slot(struct pci_bus *bus, int devfn); +bool pci_bus_has_hotplug_slots(struct pci_bus *bus); struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn); void pci_device_add(struct pci_dev *dev, struct pci_bus *bus); unsigned int pci_scan_child_bus(struct pci_bus *bus);