On 09/29/2014 03:53 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. Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com>
Reviewed-by: Neelesh Gupta <neele...@linux.vnet.ibm.com> - Neelesh
--- arch/powerpc/include/asm/opal.h | 45 +- .../include/uapi/asm/opal_platform_events.h | 90 +++ arch/powerpc/platforms/powernv/Makefile | 2 +- .../platforms/powernv/opal-platform-events.c | 737 +++++++++++++++++++++ arch/powerpc/platforms/powernv/opal-wrappers.S | 1 + arch/powerpc/platforms/powernv/opal.c | 8 +- 6 files changed, 880 insertions(+), 3 deletions(-) create mode 100644 arch/powerpc/include/uapi/asm/opal_platform_events.h create mode 100644 arch/powerpc/platforms/powernv/opal-platform-events.c diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index 86055e5..c134137 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -151,6 +151,7 @@ struct opal_sg_list { #define OPAL_HANDLE_HMI 98 #define OPAL_REGISTER_DUMP_REGION 101 #define OPAL_UNREGISTER_DUMP_REGION 102 +#define OPAL_GET_DPO_STATUS 105#ifndef __ASSEMBLY__ @@ -249,6 +250,7 @@ enum OpalMessageType {OPAL_MSG_EPOW, OPAL_MSG_SHUTDOWN, OPAL_MSG_HMI_EVT, + OPAL_MSG_DPO, OPAL_MSG_TYPE_MAX, };@@ -417,6 +419,46 @@ struct opal_msg {__be64 params[8]; };+/*+ * EPOW status sharing (OPAL and the host) + * + * The host will pass on OPAL, a buffer of length OPAL_SYSEPOW_MAX + * with individual elements being 16 bits wide to fetch the system + * wide EPOW status. Each element in the buffer will contain the + * EPOW status in it's bit representation for a particular EPOW sub + * class as defiend here. So multiple detailed EPOW status bits + * specific for any sub class can be represented in a single buffer + * element as it's bit representation. + */ + +/* System EPOW type */ +enum OpalSysEpow { + OPAL_SYSEPOW_POWER = 0, /* Power EPOW */ + OPAL_SYSEPOW_TEMP = 1, /* Temperature EPOW */ + OPAL_SYSEPOW_COOLING = 2, /* Cooling EPOW */ + OPAL_SYSEPOW_MAX = 3, /* Max EPOW categories */ +}; + +/* Power EPOW */ +enum OpalSysPower { + OPAL_SYSPOWER_UPS = 0x0001, /* System on UPS power */ + OPAL_SYSPOWER_CHNG = 0x0002, /* System power config change */ + OPAL_SYSPOWER_FAIL = 0x0004, /* System impending power failure */ + OPAL_SYSPOWER_INCL = 0x0008, /* System incomplete power */ +}; +
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