Commit 25980013 authored Aug 28, 2015 by Gavin Shan Committed by Michael Ellerman Aug 28, 2015

powerpc/eeh: Fix fenced PHB caused by eeh_slot_error_detail()



The config space of some PCI devices can't be accessed when their
PEs are in frozen state. Otherwise, fenced PHB might be seen.
Those PEs are identified with flag EEH_PE_CFG_RESTRICTED, meaing
EEH_PE_CFG_BLOCKED is set automatically when the PE is put to
frozen state (EEH_PE_ISOLATED). eeh_slot_error_detail() restores
PCI device BARs with eeh_pe_restore_bars(), which then calls
eeh_ops->restore_config() to reinitialize the PCI device in
(OPAL) firmware. eeh_ops->restore_config() produces PCI config
access that causes fenced PHB. The problem was reported on below
adapter:

   0001:01:00.0 0200: 14e4:168e (rev 10)
   0001:01:00.0 Ethernet controller: Broadcom Corporation \
                NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10)

This fixes the issue by skipping eeh_pe_restore_bars() in
eeh_slot_error_detail() when EEH_PE_CFG_BLOCKED is set for the PE.

Fixes: b6541db1 ("powerpc/eeh: Block PCI config access upon frozen PE")
Cc: stable@vger.kernel.org # v4.0+
Reported-by: Manvanthara B. Puttashankar <mputtash@in.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent ea0f8acf

arch/powerpc/kernel/eeh.c

+18 −3

Original line number	Diff line number	Diff line
		@@ -308,12 +308,27 @@ void eeh_slot_error_detail(struct eeh_pe *pe, int severity)
		if (!(pe->type & EEH_PE_PHB)) {
		if (eeh_has_flag(EEH_ENABLE_IO_FOR_LOG))
		eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);

		/*
		* The config space of some PCI devices can't be accessed
		* when their PEs are in frozen state. Otherwise, fenced
		* PHB might be seen. Those PEs are identified with flag
		* EEH_PE_CFG_RESTRICTED, indicating EEH_PE_CFG_BLOCKED
		* is set automatically when the PE is put to EEH_PE_ISOLATED.
		*
		* Restoring BARs possibly triggers PCI config access in
		* (OPAL) firmware and then causes fenced PHB. If the
		* PCI config is blocked with flag EEH_PE_CFG_BLOCKED, it's
		* pointless to restore BARs and dump config space.
		*/
		eeh_ops->configure_bridge(pe);
		if (!(pe->state & EEH_PE_CFG_BLOCKED)) {
		eeh_pe_restore_bars(pe);

		pci_regs_buf[0] = 0;
		eeh_pe_traverse(pe, eeh_dump_pe_log, &loglen);
		}
		}

		eeh_ops->get_log(pe, severity, pci_regs_buf, loglen);
		}

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