Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
Hi Rafael, On Mon, Mar 19, 2018 at 11:02:32AM +0100, Rafael J. Wysocki wrote: > On Friday, March 2, 2018 7:35:08 AM CET Lee, Chun-Yi wrote: > > In current design of ACPI container offline, Kernel emits > > KOBJ_CHANGE uevent to user space to indidate that the ejection of > > the container was triggered by platform. (caa73ea15 patch) > > > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > > the purpose. For example, a "udevadm trigger" command can also > > be used to emit change event to all udev rules. A udev rule can not > > identify that the event is from kernel for offline or from udevadm > > for other purpose. Then the offline action in udev rule may also be > > triggered by udevadm tool. > > > > So, similar to the change uevent of dock, kernel sends the > > KOBJ_CHANGE uevent with a offline environmental data to indicate > > purpose. It's useful by udev rule for using ENV{EVENT} filter. > > > > Cc: Michal Hocko> > Cc: "Rafael J. Wysocki" > > Cc: Len Brown > > Signed-off-by: "Lee, Chun-Yi" > > --- > > drivers/acpi/scan.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > > index 8e63d93..f6dca9b 100644 > > --- a/drivers/acpi/scan.c > > +++ b/drivers/acpi/scan.c > > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > { > > struct acpi_device_physical_node *pn; > > bool offline = true; > > + static const char *envp[] = { "EVENT=offline", NULL }; > > > > /* > > * acpi_container_offline() calls this for all of the container's > > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > list_for_each_entry(pn, >physical_node_list, node) > > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > > if (uevent) > > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > > envp); > > > > offline = false; > > break; > > > > This causes build issues when applied, please fix. > I just sent the v2 patch. Thanks for your review! Joey Lee
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
Hi Rafael, On Mon, Mar 19, 2018 at 11:02:32AM +0100, Rafael J. Wysocki wrote: > On Friday, March 2, 2018 7:35:08 AM CET Lee, Chun-Yi wrote: > > In current design of ACPI container offline, Kernel emits > > KOBJ_CHANGE uevent to user space to indidate that the ejection of > > the container was triggered by platform. (caa73ea15 patch) > > > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > > the purpose. For example, a "udevadm trigger" command can also > > be used to emit change event to all udev rules. A udev rule can not > > identify that the event is from kernel for offline or from udevadm > > for other purpose. Then the offline action in udev rule may also be > > triggered by udevadm tool. > > > > So, similar to the change uevent of dock, kernel sends the > > KOBJ_CHANGE uevent with a offline environmental data to indicate > > purpose. It's useful by udev rule for using ENV{EVENT} filter. > > > > Cc: Michal Hocko > > Cc: "Rafael J. Wysocki" > > Cc: Len Brown > > Signed-off-by: "Lee, Chun-Yi" > > --- > > drivers/acpi/scan.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > > index 8e63d93..f6dca9b 100644 > > --- a/drivers/acpi/scan.c > > +++ b/drivers/acpi/scan.c > > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > { > > struct acpi_device_physical_node *pn; > > bool offline = true; > > + static const char *envp[] = { "EVENT=offline", NULL }; > > > > /* > > * acpi_container_offline() calls this for all of the container's > > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > list_for_each_entry(pn, >physical_node_list, node) > > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > > if (uevent) > > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > > envp); > > > > offline = false; > > break; > > > > This causes build issues when applied, please fix. > I just sent the v2 patch. Thanks for your review! Joey Lee
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
On Friday, March 2, 2018 7:35:08 AM CET Lee, Chun-Yi wrote: > In current design of ACPI container offline, Kernel emits > KOBJ_CHANGE uevent to user space to indidate that the ejection of > the container was triggered by platform. (caa73ea15 patch) > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > the purpose. For example, a "udevadm trigger" command can also > be used to emit change event to all udev rules. A udev rule can not > identify that the event is from kernel for offline or from udevadm > for other purpose. Then the offline action in udev rule may also be > triggered by udevadm tool. > > So, similar to the change uevent of dock, kernel sends the > KOBJ_CHANGE uevent with a offline environmental data to indicate > purpose. It's useful by udev rule for using ENV{EVENT} filter. > > Cc: Michal Hocko> Cc: "Rafael J. Wysocki" > Cc: Len Brown > Signed-off-by: "Lee, Chun-Yi" > --- > drivers/acpi/scan.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 8e63d93..f6dca9b 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > { > struct acpi_device_physical_node *pn; > bool offline = true; > + static const char *envp[] = { "EVENT=offline", NULL }; > > /* >* acpi_container_offline() calls this for all of the container's > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > list_for_each_entry(pn, >physical_node_list, node) > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > if (uevent) > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > envp); > > offline = false; > break; > This causes build issues when applied, please fix. Thanks!
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
On Friday, March 2, 2018 7:35:08 AM CET Lee, Chun-Yi wrote: > In current design of ACPI container offline, Kernel emits > KOBJ_CHANGE uevent to user space to indidate that the ejection of > the container was triggered by platform. (caa73ea15 patch) > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > the purpose. For example, a "udevadm trigger" command can also > be used to emit change event to all udev rules. A udev rule can not > identify that the event is from kernel for offline or from udevadm > for other purpose. Then the offline action in udev rule may also be > triggered by udevadm tool. > > So, similar to the change uevent of dock, kernel sends the > KOBJ_CHANGE uevent with a offline environmental data to indicate > purpose. It's useful by udev rule for using ENV{EVENT} filter. > > Cc: Michal Hocko > Cc: "Rafael J. Wysocki" > Cc: Len Brown > Signed-off-by: "Lee, Chun-Yi" > --- > drivers/acpi/scan.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 8e63d93..f6dca9b 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > { > struct acpi_device_physical_node *pn; > bool offline = true; > + static const char *envp[] = { "EVENT=offline", NULL }; > > /* >* acpi_container_offline() calls this for all of the container's > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > list_for_each_entry(pn, >physical_node_list, node) > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > if (uevent) > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > envp); > > offline = false; > break; > This causes build issues when applied, please fix. Thanks!
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
On Fri, Mar 02, 2018 at 03:00:59PM +0100, Michal Hocko wrote: > On Fri 02-03-18 14:35:08, Lee, Chun-Yi wrote: > > In current design of ACPI container offline, Kernel emits > > KOBJ_CHANGE uevent to user space to indidate that the ejection of > > the container was triggered by platform. (caa73ea15 patch) > > > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > > the purpose. For example, a "udevadm trigger" command can also > > be used to emit change event to all udev rules. A udev rule can not > > identify that the event is from kernel for offline or from udevadm > > for other purpose. Then the offline action in udev rule may also be > > triggered by udevadm tool. > > > > So, similar to the change uevent of dock, kernel sends the > > KOBJ_CHANGE uevent with a offline environmental data to indicate > > purpose. It's useful by udev rule for using ENV{EVENT} filter. > > Looks reasonable to me. I have also tested this on Huawei Kunlun server > which hits the offline & online storm as a result of udevadm triggered > and a container udev rule which hooks into change event and offlines > all devices attached to the container. This patch allowed the udev rule > to be more targeted at the offline event. > > > Cc: Michal Hocko> > Cc: "Rafael J. Wysocki" > > Cc: Len Brown > > Signed-off-by: "Lee, Chun-Yi" > > Acked-by: Michal Hocko > Tested-by: Michal Hocko > Thank you for review and testing. Joey Lee > > --- > > drivers/acpi/scan.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > > index 8e63d93..f6dca9b 100644 > > --- a/drivers/acpi/scan.c > > +++ b/drivers/acpi/scan.c > > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > { > > struct acpi_device_physical_node *pn; > > bool offline = true; > > + static const char *envp[] = { "EVENT=offline", NULL }; > > > > /* > > * acpi_container_offline() calls this for all of the container's > > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > list_for_each_entry(pn, >physical_node_list, node) > > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > > if (uevent) > > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > > envp); > > > > offline = false; > > break; > > -- > > 2.10.2 > > -- > Michal Hocko > SUSE Labs
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
On Fri, Mar 02, 2018 at 03:00:59PM +0100, Michal Hocko wrote: > On Fri 02-03-18 14:35:08, Lee, Chun-Yi wrote: > > In current design of ACPI container offline, Kernel emits > > KOBJ_CHANGE uevent to user space to indidate that the ejection of > > the container was triggered by platform. (caa73ea15 patch) > > > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > > the purpose. For example, a "udevadm trigger" command can also > > be used to emit change event to all udev rules. A udev rule can not > > identify that the event is from kernel for offline or from udevadm > > for other purpose. Then the offline action in udev rule may also be > > triggered by udevadm tool. > > > > So, similar to the change uevent of dock, kernel sends the > > KOBJ_CHANGE uevent with a offline environmental data to indicate > > purpose. It's useful by udev rule for using ENV{EVENT} filter. > > Looks reasonable to me. I have also tested this on Huawei Kunlun server > which hits the offline & online storm as a result of udevadm triggered > and a container udev rule which hooks into change event and offlines > all devices attached to the container. This patch allowed the udev rule > to be more targeted at the offline event. > > > Cc: Michal Hocko > > Cc: "Rafael J. Wysocki" > > Cc: Len Brown > > Signed-off-by: "Lee, Chun-Yi" > > Acked-by: Michal Hocko > Tested-by: Michal Hocko > Thank you for review and testing. Joey Lee > > --- > > drivers/acpi/scan.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > > index 8e63d93..f6dca9b 100644 > > --- a/drivers/acpi/scan.c > > +++ b/drivers/acpi/scan.c > > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > { > > struct acpi_device_physical_node *pn; > > bool offline = true; > > + static const char *envp[] = { "EVENT=offline", NULL }; > > > > /* > > * acpi_container_offline() calls this for all of the container's > > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, > > bool uevent) > > list_for_each_entry(pn, >physical_node_list, node) > > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > > if (uevent) > > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > > envp); > > > > offline = false; > > break; > > -- > > 2.10.2 > > -- > Michal Hocko > SUSE Labs
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
On Fri 02-03-18 14:35:08, Lee, Chun-Yi wrote: > In current design of ACPI container offline, Kernel emits > KOBJ_CHANGE uevent to user space to indidate that the ejection of > the container was triggered by platform. (caa73ea15 patch) > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > the purpose. For example, a "udevadm trigger" command can also > be used to emit change event to all udev rules. A udev rule can not > identify that the event is from kernel for offline or from udevadm > for other purpose. Then the offline action in udev rule may also be > triggered by udevadm tool. > > So, similar to the change uevent of dock, kernel sends the > KOBJ_CHANGE uevent with a offline environmental data to indicate > purpose. It's useful by udev rule for using ENV{EVENT} filter. Looks reasonable to me. I have also tested this on Huawei Kunlun server which hits the offline & online storm as a result of udevadm triggered and a container udev rule which hooks into change event and offlines all devices attached to the container. This patch allowed the udev rule to be more targeted at the offline event. > Cc: Michal Hocko> Cc: "Rafael J. Wysocki" > Cc: Len Brown > Signed-off-by: "Lee, Chun-Yi" Acked-by: Michal Hocko Tested-by: Michal Hocko > --- > drivers/acpi/scan.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 8e63d93..f6dca9b 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > { > struct acpi_device_physical_node *pn; > bool offline = true; > + static const char *envp[] = { "EVENT=offline", NULL }; > > /* >* acpi_container_offline() calls this for all of the container's > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > list_for_each_entry(pn, >physical_node_list, node) > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > if (uevent) > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > envp); > > offline = false; > break; > -- > 2.10.2 -- Michal Hocko SUSE Labs
Re: [PATCH] ACPI / scan: Send the change uevent with offine environmental data
On Fri 02-03-18 14:35:08, Lee, Chun-Yi wrote: > In current design of ACPI container offline, Kernel emits > KOBJ_CHANGE uevent to user space to indidate that the ejection of > the container was triggered by platform. (caa73ea15 patch) > > A pure KOBJ_CHANGE uevent is not enough for user space to identify > the purpose. For example, a "udevadm trigger" command can also > be used to emit change event to all udev rules. A udev rule can not > identify that the event is from kernel for offline or from udevadm > for other purpose. Then the offline action in udev rule may also be > triggered by udevadm tool. > > So, similar to the change uevent of dock, kernel sends the > KOBJ_CHANGE uevent with a offline environmental data to indicate > purpose. It's useful by udev rule for using ENV{EVENT} filter. Looks reasonable to me. I have also tested this on Huawei Kunlun server which hits the offline & online storm as a result of udevadm triggered and a container udev rule which hooks into change event and offlines all devices attached to the container. This patch allowed the udev rule to be more targeted at the offline event. > Cc: Michal Hocko > Cc: "Rafael J. Wysocki" > Cc: Len Brown > Signed-off-by: "Lee, Chun-Yi" Acked-by: Michal Hocko Tested-by: Michal Hocko > --- > drivers/acpi/scan.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 8e63d93..f6dca9b 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > { > struct acpi_device_physical_node *pn; > bool offline = true; > + static const char *envp[] = { "EVENT=offline", NULL }; > > /* >* acpi_container_offline() calls this for all of the container's > @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool > uevent) > list_for_each_entry(pn, >physical_node_list, node) > if (device_supports_offline(pn->dev) && !pn->dev->offline) { > if (uevent) > - kobject_uevent(>dev->kobj, KOBJ_CHANGE); > + kobject_uevent_env(>dev->kobj, KOBJ_CHANGE, > envp); > > offline = false; > break; > -- > 2.10.2 -- Michal Hocko SUSE Labs