[PATCH V3] powerpc, powernv: Add OPAL platform event driver
Anshuman Khandual
khandual at linux.vnet.ibm.com
Tue Dec 2 19:04:28 AEDT 2014
On 11/25/2014 06:51 PM, Anshuman Khandual wrote:
> This patch creates a new OPAL platform event character driver
> which will give userspace clients the access to these events
> and process them effectively. Following platforms events are
> currently supported with this platform driver.
>
> (1) Environmental and Power Warning (EPOW)
> (2) Delayed Power Off (DPO)
>
> The user interface for this driver is /dev/opal_event character
> device file where the user space clients can poll and read for
> new opal platform events. The expected sequence of events driven
> from user space should be like the following.
>
> (1) Open the character device file
> (2) Poll on the file for POLLIN event
> (3) When unblocked, must attempt to read PLAT_EVENT_MAX_SIZE size
> (4) Kernel driver will pass at most one opal_plat_event structure
> (5) Poll again for more new events
>
> The driver registers for OPAL messages notifications corresponding to
> individual OPAL events. When any of those event messages arrive in the
> kernel, the callbacks are called to process them which in turn unblocks
> the polling thread on the character device file. The driver also registers
> a timer function which will be called after a threshold amount of time to
> shutdown the system. The user space client receives the timeout value for
> all individual OPAL platform events and hence must prepare the system and
> eventually shutdown. In case the user client does not shutdown the system,
> the timer function will be called after the threshold and shutdown the
> system explicitly.
>
> Reviewed-by: Neelesh Gupta <neelegup at linux.vnet.ibm.com>
> Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com>
> ---
> Changes in V3:
> - Rebased the patch against the mainline
>
> Changes in V2:
> - Changed the function fetch_dpo_timeout
> - Export opal_platform_events.h for user space consumption
> - Posted here https://patchwork.ozlabs.org/patch/396725/
>
> Original V1:
> - Original patch
> - Posted here http://patchwork.ozlabs.org/patch/394340/
Hey Michael,
Do you have any updates on this patch yet ? Thanks !
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