powerpc/pseries: Add PRRN RTAS event handler (49c68a85) · Commits · 戴 / test

A PRRN event is signaled via the RTAS event-scan mechanism, which returns a Hot Plug Event message "fixed part" indicating "Platform Resource Reassignment". In response to the Hot Plug Event message, we must call ibm,update-nodes to determine which resources were reassigned and then ibm,update-properties to obtain the new affinity information about those resources. The PRRN event-scan RTAS message contains only the "fixed part" with the "Type" field set to the value 160 and no Extended Event Log. The four-byte Extended Event Log Length field is re-purposed (since no Extended Event Log message is included) to pass the "scope" parameter that causes the ibm,update-nodes to return the nodes affected by the specific resource reassignment. This patch adds a handler for RTAS events. The function pseries_devicetree_update() (from mobility.c) is used to make the ibm,update-nodes/ibm,update-properties RTAS calls. Updating the NUMA maps (handled by a subsequent patch) will require significant processing, so pseries_devicetree_update() is called from an asynchronous workqueue to allow event processing to continue. PRRN RTAS events on pseries systems are rare events that have to be initiated from the HMC console for the system by an IBM tech. This allows us to assume that these events are widely spaced. Additionally, all work on the queue is flushed before handling any new work to ensure we only have one event in flight being handled at a time. Signed-off-by:

Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by:

Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/rtas.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -143,6 +143,8 @@ struct rtas_suspend_me_data {
		#define RTAS_TYPE_PMGM_TIME_ALARM 0x6f
		#define RTAS_TYPE_PMGM_CONFIG_CHANGE 0x70
		#define RTAS_TYPE_PMGM_SERVICE_PROC 0x71
		/* Platform Resource Reassignment Notification */
		#define RTAS_TYPE_PRRN 0xA0

		/* RTAS check-exception vector offset */
		#define RTAS_VECTOR_EXTERNAL_INTERRUPT 0x500

arch/powerpc/kernel/rtasd.c

+45 −1

Original line number	Diff line number	Diff line
		@@ -87,6 +87,8 @@ static char *rtas_event_type(int type)
		return "Resource Deallocation Event";
		case RTAS_TYPE_DUMP:
		return "Dump Notification Event";
		case RTAS_TYPE_PRRN:
		return "Platform Resource Reassignment Event";
		}

		return rtas_type[0];
		@@ -265,9 +267,49 @@ void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
		spin_unlock_irqrestore(&rtasd_log_lock, s);
		return;
		}
		}

		#ifdef CONFIG_PPC_PSERIES
		static s32 prrn_update_scope;

		static void prrn_work_fn(struct work_struct *work)
		{
		/*
		* For PRRN, we must pass the negative of the scope value in
		* the RTAS event.
		*/
		pseries_devicetree_update(-prrn_update_scope);
		}

		static DECLARE_WORK(prrn_work, prrn_work_fn);

		void prrn_schedule_update(u32 scope)
		{
		flush_work(&prrn_work);
		prrn_update_scope = scope;
		schedule_work(&prrn_work);
		}

		static void handle_rtas_event(const struct rtas_error_log *log)
		{
		if (log->type == RTAS_TYPE_PRRN)
		/* For PRRN Events the extended log length is used to denote
		* the scope for calling rtas update-nodes.
		*/
		prrn_schedule_update(log->extended_log_length);

		return;
		}

		#else

		static void handle_rtas_event(const struct rtas_error_log *log)
		{
		return;
		}

		#endif

		static int rtas_log_open(struct inode * inode, struct file * file)
		{
		return 0;
		@@ -388,8 +430,10 @@ static void do_event_scan(void)
		break;
		}

		if (error == 0)
		if (error == 0) {
		pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0);
		handle_rtas_event((struct rtas_error_log *)logdata);
		}

		} while(error == 0);
		}

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