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| author |   Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com> | 2014-06-04 10:57:51 -0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-09 14:14:27 -0700 |
| commit | fb145456fa4f4311f90703aeee058bab3b274bf8 (patch) | |
| tree | 980ae85a3c35b8b574dddeaf96bf84d41dbb83d3 /drivers/misc/genwqe/card_utils.c | |
| parent | GenWQE: Add sysfs interface for bitstream reload (diff) | |
| download | linux-dev-fb145456fa4f4311f90703aeee058bab3b274bf8.tar.xz linux-dev-fb145456fa4f4311f90703aeee058bab3b274bf8.zip | |
GenWQE: Add support for EEH error recovery
This patch implements the callbacks and functions necessary to have EEH
recovery support.
It adds a config option to enable or disable explicit calls to trigger
platform specific mechanisms on error recovery paths. This option is
enabled by default only on PPC64 systems and can be overritten via
debugfs. If this option is enabled, on the error recovery path the
driver will call pci_channel_offline() to check for error condition and
issue non-raw MMIO reads to trigger early EEH detection in case of
hardware failures. This is necessary since the driver MMIO helper
funtions use raw accessors.
Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
Acked-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/genwqe/card_utils.c')
| -rw-r--r-- | drivers/misc/genwqe/card_utils.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c index 62cc6bb3f62e..4a500582eef0 100644 --- a/drivers/misc/genwqe/card_utils.c +++ b/drivers/misc/genwqe/card_utils.c @@ -53,12 +53,17 @@ */ int __genwqe_writeq(struct genwqe_dev *cd, u64 byte_offs, u64 val) { + struct pci_dev *pci_dev = cd->pci_dev; + if (cd->err_inject & GENWQE_INJECT_HARDWARE_FAILURE) return -EIO; if (cd->mmio == NULL) return -EIO; + if (pci_channel_offline(pci_dev)) + return -EIO; + __raw_writeq((__force u64)cpu_to_be64(val), cd->mmio + byte_offs); return 0; } @@ -99,12 +104,17 @@ u64 __genwqe_readq(struct genwqe_dev *cd, u64 byte_offs) */ int __genwqe_writel(struct genwqe_dev *cd, u64 byte_offs, u32 val) { + struct pci_dev *pci_dev = cd->pci_dev; + if (cd->err_inject & GENWQE_INJECT_HARDWARE_FAILURE) return -EIO; if (cd->mmio == NULL) return -EIO; + if (pci_channel_offline(pci_dev)) + return -EIO; + __raw_writel((__force u32)cpu_to_be32(val), cd->mmio + byte_offs); return 0; } |