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| author | Gavin Shan <gwshan@linux.vnet.ibm.com> | 2014-04-24 18:00:12 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-04-28 17:34:02 +1000 |
| commit | d0914f503f7ba2cd078b123983562be8951296d3 (patch) | |
| tree | 1b8ddd75171e8ff07f8e52208906fd7a825170e8 /arch/powerpc/include/asm/eeh.h | |
| parent | 7b401850a1c9b64b010b3d107321df4e7d066995 (diff) | |
| download | op-kernel-dev-d0914f503f7ba2cd078b123983562be8951296d3.zip op-kernel-dev-d0914f503f7ba2cd078b123983562be8951296d3.tar.gz | |
powerpc/eeh: Block PCI-CFG access during PE reset
We've observed multiple PE reset failures because of PCI-CFG
access during that period. Potentially, some device drivers
can't support EEH very well and they can't put the device to
motionless state before PE reset. So those device drivers might
produce PCI-CFG accesses during PE reset. Also, we could have
PCI-CFG access from user space (e.g. "lspci"). Since access to
frozen PE should return 0xFF's, we can block PCI-CFG access
during the period of PE reset so that we won't get recrusive EEH
errors.
The patch adds flag EEH_PE_RESET, which is kept during PE reset.
The PowerNV/pSeries PCI-CFG accessors reuse the flag to block
PCI-CFG accordingly.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/eeh.h')
| -rw-r--r-- | arch/powerpc/include/asm/eeh.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h index a61b06f..fa32d8d 100644 --- a/arch/powerpc/include/asm/eeh.h +++ b/arch/powerpc/include/asm/eeh.h @@ -53,6 +53,7 @@ struct device_node; #define EEH_PE_ISOLATED (1 << 0) /* Isolated PE */ #define EEH_PE_RECOVERING (1 << 1) /* Recovering PE */ +#define EEH_PE_RESET (1 << 2) /* PE reset in progress */ #define EEH_PE_KEEP (1 << 8) /* Keep PE on hotplug */ |
