powerpc/eeh: Allow to check fenced PHB proactively (b95cd2cd) · Commits · 戴 / test

arch/powerpc/kernel/eeh.c

+60 −0

Original line number	Diff line number	Diff line
		@@ -269,6 +269,58 @@ static inline unsigned long eeh_token_to_phys(unsigned long token)
		return pa \| (token & (PAGE_SIZE-1));
		}

		/*
		* On PowerNV platform, we might already have fenced PHB there.
		* For that case, it's meaningless to recover frozen PE. Intead,
		* We have to handle fenced PHB firstly.
		*/
		static int eeh_phb_check_failure(struct eeh_pe *pe)
		{
		struct eeh_pe *phb_pe;
		unsigned long flags;
		int ret;

		if (!eeh_probe_mode_dev())
		return -EPERM;

		/* Find the PHB PE */
		phb_pe = eeh_phb_pe_get(pe->phb);
		if (!phb_pe) {
		pr_warning("%s Can't find PE for PHB#%d\n",
		__func__, pe->phb->global_number);
		return -EEXIST;
		}

		/* If the PHB has been in problematic state */
		eeh_serialize_lock(&flags);
		if (phb_pe->state & (EEH_PE_ISOLATED \| EEH_PE_PHB_DEAD)) {
		ret = 0;
		goto out;
		}

		/* Check PHB state */
		ret = eeh_ops->get_state(phb_pe, NULL);
		if ((ret < 0) \|\|
		(ret == EEH_STATE_NOT_SUPPORT) \|\|
		(ret & (EEH_STATE_MMIO_ACTIVE \| EEH_STATE_DMA_ACTIVE)) ==
		(EEH_STATE_MMIO_ACTIVE \| EEH_STATE_DMA_ACTIVE)) {
		ret = 0;
		goto out;
		}

		/* Isolate the PHB and send event */
		eeh_pe_state_mark(phb_pe, EEH_PE_ISOLATED);
		eeh_serialize_unlock(flags);
		eeh_send_failure_event(phb_pe);

		WARN(1, "EEH: PHB failure detected\n");

		return 1;
		out:
		eeh_serialize_unlock(flags);
		return ret;
		}

		/**
		* eeh_dev_check_failure - Check if all 1's data is due to EEH slot freeze
		* @edev: eeh device
		@@ -319,6 +371,14 @@ int eeh_dev_check_failure(struct eeh_dev *edev)
		return 0;
		}

		/*
		* On PowerNV platform, we might already have fenced PHB
		* there and we need take care of that firstly.
		*/
		ret = eeh_phb_check_failure(pe);
		if (ret > 0)
		return ret;

		/* If we already have a pending isolation event for this
		* slot, we know it's bad already, we don't need to check.
		* Do this checking under a lock; as multiple PCI devices

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