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powerpc/eeh: Freeze PE before PE reset

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The patch adds one more option (EEH_OPT_FREEZE_PE) to set_option()
method to proactively freeze PE, which will be issued before resetting
pass-throughed PE to drop MMIO access during reset because it's
always contributing to recursive EEH error.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan
2014-09-30 12:38:52 +10:00
committed by Michael Ellerman
parent 940376b3a4
commit 0d5ee5205e
4 changed files with 44 additions and 11 deletions
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7
arch/powerpc/kernel/eeh.c
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@@ -1382,6 +1382,13 @@ int eeh_pe_reset(struct eeh_pe *pe, int option)
break;
case EEH_RESET_HOT:
case EEH_RESET_FUNDAMENTAL:
/*
* Proactively freeze the PE to drop all MMIO access
* during reset, which should be banned as it's always
* cause recursive EEH error.
*/
eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE);
ret = eeh_ops->reset(pe, option);
break;
default: